1 // arm.cc -- arm target support for gold.
3 // Copyright 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
4 // Written by Doug Kwan <dougkwan@google.com> based on the i386 code
5 // by Ian Lance Taylor <iant@google.com>.
6 // This file also contains borrowed and adapted code from
9 // This file is part of gold.
11 // This program is free software; you can redistribute it and/or modify
12 // it under the terms of the GNU General Public License as published by
13 // the Free Software Foundation; either version 3 of the License, or
14 // (at your option) any later version.
16 // This program is distributed in the hope that it will be useful,
17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 // GNU General Public License for more details.
21 // You should have received a copy of the GNU General Public License
22 // along with this program; if not, write to the Free Software
23 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
24 // MA 02110-1301, USA.
38 #include "parameters.h"
45 #include "copy-relocs.h"
47 #include "target-reloc.h"
48 #include "target-select.h"
52 #include "attributes.h"
53 #include "arm-reloc-property.h"
61 template<bool big_endian>
62 class Output_data_plt_arm;
64 template<bool big_endian>
65 class Output_data_plt_arm_standard;
67 template<bool big_endian>
70 template<bool big_endian>
71 class Arm_input_section;
73 class Arm_exidx_cantunwind;
75 class Arm_exidx_merged_section;
77 class Arm_exidx_fixup;
79 template<bool big_endian>
80 class Arm_output_section;
82 class Arm_exidx_input_section;
84 template<bool big_endian>
87 template<bool big_endian>
88 class Arm_relocate_functions;
90 template<bool big_endian>
91 class Arm_output_data_got;
93 template<bool big_endian>
97 typedef elfcpp::Elf_types<32>::Elf_Addr Arm_address;
99 // Maximum branch offsets for ARM, THUMB and THUMB2.
100 const int32_t ARM_MAX_FWD_BRANCH_OFFSET = ((((1 << 23) - 1) << 2) + 8);
101 const int32_t ARM_MAX_BWD_BRANCH_OFFSET = ((-((1 << 23) << 2)) + 8);
102 const int32_t THM_MAX_FWD_BRANCH_OFFSET = ((1 << 22) -2 + 4);
103 const int32_t THM_MAX_BWD_BRANCH_OFFSET = (-(1 << 22) + 4);
104 const int32_t THM2_MAX_FWD_BRANCH_OFFSET = (((1 << 24) - 2) + 4);
105 const int32_t THM2_MAX_BWD_BRANCH_OFFSET = (-(1 << 24) + 4);
107 // Thread Control Block size.
108 const size_t ARM_TCB_SIZE = 8;
110 // The arm target class.
112 // This is a very simple port of gold for ARM-EABI. It is intended for
113 // supporting Android only for the time being.
116 // - Implement all static relocation types documented in arm-reloc.def.
117 // - Make PLTs more flexible for different architecture features like
119 // There are probably a lot more.
121 // Ideally we would like to avoid using global variables but this is used
122 // very in many places and sometimes in loops. If we use a function
123 // returning a static instance of Arm_reloc_property_table, it will be very
124 // slow in an threaded environment since the static instance needs to be
125 // locked. The pointer is below initialized in the
126 // Target::do_select_as_default_target() hook so that we do not spend time
127 // building the table if we are not linking ARM objects.
129 // An alternative is to to process the information in arm-reloc.def in
130 // compilation time and generate a representation of it in PODs only. That
131 // way we can avoid initialization when the linker starts.
133 Arm_reloc_property_table* arm_reloc_property_table = NULL;
135 // Instruction template class. This class is similar to the insn_sequence
136 // struct in bfd/elf32-arm.c.
141 // Types of instruction templates.
145 // THUMB16_SPECIAL_TYPE is used by sub-classes of Stub for instruction
146 // templates with class-specific semantics. Currently this is used
147 // only by the Cortex_a8_stub class for handling condition codes in
148 // conditional branches.
149 THUMB16_SPECIAL_TYPE,
155 // Factory methods to create instruction templates in different formats.
157 static const Insn_template
158 thumb16_insn(uint32_t data)
159 { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 0); }
161 // A Thumb conditional branch, in which the proper condition is inserted
162 // when we build the stub.
163 static const Insn_template
164 thumb16_bcond_insn(uint32_t data)
165 { return Insn_template(data, THUMB16_SPECIAL_TYPE, elfcpp::R_ARM_NONE, 1); }
167 static const Insn_template
168 thumb32_insn(uint32_t data)
169 { return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_NONE, 0); }
171 static const Insn_template
172 thumb32_b_insn(uint32_t data, int reloc_addend)
174 return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_THM_JUMP24,
178 static const Insn_template
179 arm_insn(uint32_t data)
180 { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_NONE, 0); }
182 static const Insn_template
183 arm_rel_insn(unsigned data, int reloc_addend)
184 { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_JUMP24, reloc_addend); }
186 static const Insn_template
187 data_word(unsigned data, unsigned int r_type, int reloc_addend)
188 { return Insn_template(data, DATA_TYPE, r_type, reloc_addend); }
190 // Accessors. This class is used for read-only objects so no modifiers
195 { return this->data_; }
197 // Return the instruction sequence type of this.
200 { return this->type_; }
202 // Return the ARM relocation type of this.
205 { return this->r_type_; }
209 { return this->reloc_addend_; }
211 // Return size of instruction template in bytes.
215 // Return byte-alignment of instruction template.
220 // We make the constructor private to ensure that only the factory
223 Insn_template(unsigned data, Type type, unsigned int r_type, int reloc_addend)
224 : data_(data), type_(type), r_type_(r_type), reloc_addend_(reloc_addend)
227 // Instruction specific data. This is used to store information like
228 // some of the instruction bits.
230 // Instruction template type.
232 // Relocation type if there is a relocation or R_ARM_NONE otherwise.
233 unsigned int r_type_;
234 // Relocation addend.
235 int32_t reloc_addend_;
238 // Macro for generating code to stub types. One entry per long/short
242 DEF_STUB(long_branch_any_any) \
243 DEF_STUB(long_branch_v4t_arm_thumb) \
244 DEF_STUB(long_branch_thumb_only) \
245 DEF_STUB(long_branch_v4t_thumb_thumb) \
246 DEF_STUB(long_branch_v4t_thumb_arm) \
247 DEF_STUB(short_branch_v4t_thumb_arm) \
248 DEF_STUB(long_branch_any_arm_pic) \
249 DEF_STUB(long_branch_any_thumb_pic) \
250 DEF_STUB(long_branch_v4t_thumb_thumb_pic) \
251 DEF_STUB(long_branch_v4t_arm_thumb_pic) \
252 DEF_STUB(long_branch_v4t_thumb_arm_pic) \
253 DEF_STUB(long_branch_thumb_only_pic) \
254 DEF_STUB(a8_veneer_b_cond) \
255 DEF_STUB(a8_veneer_b) \
256 DEF_STUB(a8_veneer_bl) \
257 DEF_STUB(a8_veneer_blx) \
258 DEF_STUB(v4_veneer_bx)
262 #define DEF_STUB(x) arm_stub_##x,
268 // First reloc stub type.
269 arm_stub_reloc_first = arm_stub_long_branch_any_any,
270 // Last reloc stub type.
271 arm_stub_reloc_last = arm_stub_long_branch_thumb_only_pic,
273 // First Cortex-A8 stub type.
274 arm_stub_cortex_a8_first = arm_stub_a8_veneer_b_cond,
275 // Last Cortex-A8 stub type.
276 arm_stub_cortex_a8_last = arm_stub_a8_veneer_blx,
279 arm_stub_type_last = arm_stub_v4_veneer_bx
283 // Stub template class. Templates are meant to be read-only objects.
284 // A stub template for a stub type contains all read-only attributes
285 // common to all stubs of the same type.
290 Stub_template(Stub_type, const Insn_template*, size_t);
298 { return this->type_; }
300 // Return an array of instruction templates.
303 { return this->insns_; }
305 // Return size of template in number of instructions.
308 { return this->insn_count_; }
310 // Return size of template in bytes.
313 { return this->size_; }
315 // Return alignment of the stub template.
318 { return this->alignment_; }
320 // Return whether entry point is in thumb mode.
322 entry_in_thumb_mode() const
323 { return this->entry_in_thumb_mode_; }
325 // Return number of relocations in this template.
328 { return this->relocs_.size(); }
330 // Return index of the I-th instruction with relocation.
332 reloc_insn_index(size_t i) const
334 gold_assert(i < this->relocs_.size());
335 return this->relocs_[i].first;
338 // Return the offset of the I-th instruction with relocation from the
339 // beginning of the stub.
341 reloc_offset(size_t i) const
343 gold_assert(i < this->relocs_.size());
344 return this->relocs_[i].second;
348 // This contains information about an instruction template with a relocation
349 // and its offset from start of stub.
350 typedef std::pair<size_t, section_size_type> Reloc;
352 // A Stub_template may not be copied. We want to share templates as much
354 Stub_template(const Stub_template&);
355 Stub_template& operator=(const Stub_template&);
359 // Points to an array of Insn_templates.
360 const Insn_template* insns_;
361 // Number of Insn_templates in insns_[].
363 // Size of templated instructions in bytes.
365 // Alignment of templated instructions.
367 // Flag to indicate if entry is in thumb mode.
368 bool entry_in_thumb_mode_;
369 // A table of reloc instruction indices and offsets. We can find these by
370 // looking at the instruction templates but we pre-compute and then stash
371 // them here for speed.
372 std::vector<Reloc> relocs_;
376 // A class for code stubs. This is a base class for different type of
377 // stubs used in the ARM target.
383 static const section_offset_type invalid_offset =
384 static_cast<section_offset_type>(-1);
387 Stub(const Stub_template* stub_template)
388 : stub_template_(stub_template), offset_(invalid_offset)
395 // Return the stub template.
397 stub_template() const
398 { return this->stub_template_; }
400 // Return offset of code stub from beginning of its containing stub table.
404 gold_assert(this->offset_ != invalid_offset);
405 return this->offset_;
408 // Set offset of code stub from beginning of its containing stub table.
410 set_offset(section_offset_type offset)
411 { this->offset_ = offset; }
413 // Return the relocation target address of the i-th relocation in the
414 // stub. This must be defined in a child class.
416 reloc_target(size_t i)
417 { return this->do_reloc_target(i); }
419 // Write a stub at output VIEW. BIG_ENDIAN select how a stub is written.
421 write(unsigned char* view, section_size_type view_size, bool big_endian)
422 { this->do_write(view, view_size, big_endian); }
424 // Return the instruction for THUMB16_SPECIAL_TYPE instruction template
425 // for the i-th instruction.
427 thumb16_special(size_t i)
428 { return this->do_thumb16_special(i); }
431 // This must be defined in the child class.
433 do_reloc_target(size_t) = 0;
435 // This may be overridden in the child class.
437 do_write(unsigned char* view, section_size_type view_size, bool big_endian)
440 this->do_fixed_endian_write<true>(view, view_size);
442 this->do_fixed_endian_write<false>(view, view_size);
445 // This must be overridden if a child class uses the THUMB16_SPECIAL_TYPE
446 // instruction template.
448 do_thumb16_special(size_t)
449 { gold_unreachable(); }
452 // A template to implement do_write.
453 template<bool big_endian>
455 do_fixed_endian_write(unsigned char*, section_size_type);
458 const Stub_template* stub_template_;
459 // Offset within the section of containing this stub.
460 section_offset_type offset_;
463 // Reloc stub class. These are stubs we use to fix up relocation because
464 // of limited branch ranges.
466 class Reloc_stub : public Stub
469 static const unsigned int invalid_index = static_cast<unsigned int>(-1);
470 // We assume we never jump to this address.
471 static const Arm_address invalid_address = static_cast<Arm_address>(-1);
473 // Return destination address.
475 destination_address() const
477 gold_assert(this->destination_address_ != this->invalid_address);
478 return this->destination_address_;
481 // Set destination address.
483 set_destination_address(Arm_address address)
485 gold_assert(address != this->invalid_address);
486 this->destination_address_ = address;
489 // Reset destination address.
491 reset_destination_address()
492 { this->destination_address_ = this->invalid_address; }
494 // Determine stub type for a branch of a relocation of R_TYPE going
495 // from BRANCH_ADDRESS to BRANCH_TARGET. If TARGET_IS_THUMB is set,
496 // the branch target is a thumb instruction. TARGET is used for look
497 // up ARM-specific linker settings.
499 stub_type_for_reloc(unsigned int r_type, Arm_address branch_address,
500 Arm_address branch_target, bool target_is_thumb);
502 // Reloc_stub key. A key is logically a triplet of a stub type, a symbol
503 // and an addend. Since we treat global and local symbol differently, we
504 // use a Symbol object for a global symbol and a object-index pair for
509 // If SYMBOL is not null, this is a global symbol, we ignore RELOBJ and
510 // R_SYM. Otherwise, this is a local symbol and RELOBJ must non-NULL
511 // and R_SYM must not be invalid_index.
512 Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj,
513 unsigned int r_sym, int32_t addend)
514 : stub_type_(stub_type), addend_(addend)
518 this->r_sym_ = Reloc_stub::invalid_index;
519 this->u_.symbol = symbol;
523 gold_assert(relobj != NULL && r_sym != invalid_index);
524 this->r_sym_ = r_sym;
525 this->u_.relobj = relobj;
532 // Accessors: Keys are meant to be read-only object so no modifiers are
538 { return this->stub_type_; }
540 // Return the local symbol index or invalid_index.
543 { return this->r_sym_; }
545 // Return the symbol if there is one.
548 { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; }
550 // Return the relobj if there is one.
553 { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; }
555 // Whether this equals to another key k.
557 eq(const Key& k) const
559 return ((this->stub_type_ == k.stub_type_)
560 && (this->r_sym_ == k.r_sym_)
561 && ((this->r_sym_ != Reloc_stub::invalid_index)
562 ? (this->u_.relobj == k.u_.relobj)
563 : (this->u_.symbol == k.u_.symbol))
564 && (this->addend_ == k.addend_));
567 // Return a hash value.
571 return (this->stub_type_
573 ^ gold::string_hash<char>(
574 (this->r_sym_ != Reloc_stub::invalid_index)
575 ? this->u_.relobj->name().c_str()
576 : this->u_.symbol->name())
580 // Functors for STL associative containers.
584 operator()(const Key& k) const
585 { return k.hash_value(); }
591 operator()(const Key& k1, const Key& k2) const
592 { return k1.eq(k2); }
595 // Name of key. This is mainly for debugging.
601 Stub_type stub_type_;
602 // If this is a local symbol, this is the index in the defining object.
603 // Otherwise, it is invalid_index for a global symbol.
605 // If r_sym_ is an invalid index, this points to a global symbol.
606 // Otherwise, it points to a relobj. We used the unsized and target
607 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
608 // Arm_relobj, in order to avoid making the stub class a template
609 // as most of the stub machinery is endianness-neutral. However, it
610 // may require a bit of casting done by users of this class.
613 const Symbol* symbol;
614 const Relobj* relobj;
616 // Addend associated with a reloc.
621 // Reloc_stubs are created via a stub factory. So these are protected.
622 Reloc_stub(const Stub_template* stub_template)
623 : Stub(stub_template), destination_address_(invalid_address)
629 friend class Stub_factory;
631 // Return the relocation target address of the i-th relocation in the
634 do_reloc_target(size_t i)
636 // All reloc stub have only one relocation.
638 return this->destination_address_;
642 // Address of destination.
643 Arm_address destination_address_;
646 // Cortex-A8 stub class. We need a Cortex-A8 stub to redirect any 32-bit
647 // THUMB branch that meets the following conditions:
649 // 1. The branch straddles across a page boundary. i.e. lower 12-bit of
650 // branch address is 0xffe.
651 // 2. The branch target address is in the same page as the first word of the
653 // 3. The branch follows a 32-bit instruction which is not a branch.
655 // To do the fix up, we need to store the address of the branch instruction
656 // and its target at least. We also need to store the original branch
657 // instruction bits for the condition code in a conditional branch. The
658 // condition code is used in a special instruction template. We also want
659 // to identify input sections needing Cortex-A8 workaround quickly. We store
660 // extra information about object and section index of the code section
661 // containing a branch being fixed up. The information is used to mark
662 // the code section when we finalize the Cortex-A8 stubs.
665 class Cortex_a8_stub : public Stub
671 // Return the object of the code section containing the branch being fixed
675 { return this->relobj_; }
677 // Return the section index of the code section containing the branch being
681 { return this->shndx_; }
683 // Return the source address of stub. This is the address of the original
684 // branch instruction. LSB is 1 always set to indicate that it is a THUMB
687 source_address() const
688 { return this->source_address_; }
690 // Return the destination address of the stub. This is the branch taken
691 // address of the original branch instruction. LSB is 1 if it is a THUMB
692 // instruction address.
694 destination_address() const
695 { return this->destination_address_; }
697 // Return the instruction being fixed up.
699 original_insn() const
700 { return this->original_insn_; }
703 // Cortex_a8_stubs are created via a stub factory. So these are protected.
704 Cortex_a8_stub(const Stub_template* stub_template, Relobj* relobj,
705 unsigned int shndx, Arm_address source_address,
706 Arm_address destination_address, uint32_t original_insn)
707 : Stub(stub_template), relobj_(relobj), shndx_(shndx),
708 source_address_(source_address | 1U),
709 destination_address_(destination_address),
710 original_insn_(original_insn)
713 friend class Stub_factory;
715 // Return the relocation target address of the i-th relocation in the
718 do_reloc_target(size_t i)
720 if (this->stub_template()->type() == arm_stub_a8_veneer_b_cond)
722 // The conditional branch veneer has two relocations.
724 return i == 0 ? this->source_address_ + 4 : this->destination_address_;
728 // All other Cortex-A8 stubs have only one relocation.
730 return this->destination_address_;
734 // Return an instruction for the THUMB16_SPECIAL_TYPE instruction template.
736 do_thumb16_special(size_t);
739 // Object of the code section containing the branch being fixed up.
741 // Section index of the code section containing the branch begin fixed up.
743 // Source address of original branch.
744 Arm_address source_address_;
745 // Destination address of the original branch.
746 Arm_address destination_address_;
747 // Original branch instruction. This is needed for copying the condition
748 // code from a condition branch to its stub.
749 uint32_t original_insn_;
752 // ARMv4 BX Rx branch relocation stub class.
753 class Arm_v4bx_stub : public Stub
759 // Return the associated register.
762 { return this->reg_; }
765 // Arm V4BX stubs are created via a stub factory. So these are protected.
766 Arm_v4bx_stub(const Stub_template* stub_template, const uint32_t reg)
767 : Stub(stub_template), reg_(reg)
770 friend class Stub_factory;
772 // Return the relocation target address of the i-th relocation in the
775 do_reloc_target(size_t)
776 { gold_unreachable(); }
778 // This may be overridden in the child class.
780 do_write(unsigned char* view, section_size_type view_size, bool big_endian)
783 this->do_fixed_endian_v4bx_write<true>(view, view_size);
785 this->do_fixed_endian_v4bx_write<false>(view, view_size);
789 // A template to implement do_write.
790 template<bool big_endian>
792 do_fixed_endian_v4bx_write(unsigned char* view, section_size_type)
794 const Insn_template* insns = this->stub_template()->insns();
795 elfcpp::Swap<32, big_endian>::writeval(view,
797 + (this->reg_ << 16)));
798 view += insns[0].size();
799 elfcpp::Swap<32, big_endian>::writeval(view,
800 (insns[1].data() + this->reg_));
801 view += insns[1].size();
802 elfcpp::Swap<32, big_endian>::writeval(view,
803 (insns[2].data() + this->reg_));
806 // A register index (r0-r14), which is associated with the stub.
810 // Stub factory class.
815 // Return the unique instance of this class.
816 static const Stub_factory&
819 static Stub_factory singleton;
823 // Make a relocation stub.
825 make_reloc_stub(Stub_type stub_type) const
827 gold_assert(stub_type >= arm_stub_reloc_first
828 && stub_type <= arm_stub_reloc_last);
829 return new Reloc_stub(this->stub_templates_[stub_type]);
832 // Make a Cortex-A8 stub.
834 make_cortex_a8_stub(Stub_type stub_type, Relobj* relobj, unsigned int shndx,
835 Arm_address source, Arm_address destination,
836 uint32_t original_insn) const
838 gold_assert(stub_type >= arm_stub_cortex_a8_first
839 && stub_type <= arm_stub_cortex_a8_last);
840 return new Cortex_a8_stub(this->stub_templates_[stub_type], relobj, shndx,
841 source, destination, original_insn);
844 // Make an ARM V4BX relocation stub.
845 // This method creates a stub from the arm_stub_v4_veneer_bx template only.
847 make_arm_v4bx_stub(uint32_t reg) const
849 gold_assert(reg < 0xf);
850 return new Arm_v4bx_stub(this->stub_templates_[arm_stub_v4_veneer_bx],
855 // Constructor and destructor are protected since we only return a single
856 // instance created in Stub_factory::get_instance().
860 // A Stub_factory may not be copied since it is a singleton.
861 Stub_factory(const Stub_factory&);
862 Stub_factory& operator=(Stub_factory&);
864 // Stub templates. These are initialized in the constructor.
865 const Stub_template* stub_templates_[arm_stub_type_last+1];
868 // A class to hold stubs for the ARM target.
870 template<bool big_endian>
871 class Stub_table : public Output_data
874 Stub_table(Arm_input_section<big_endian>* owner)
875 : Output_data(), owner_(owner), reloc_stubs_(), reloc_stubs_size_(0),
876 reloc_stubs_addralign_(1), cortex_a8_stubs_(), arm_v4bx_stubs_(0xf),
877 prev_data_size_(0), prev_addralign_(1)
883 // Owner of this stub table.
884 Arm_input_section<big_endian>*
886 { return this->owner_; }
888 // Whether this stub table is empty.
892 return (this->reloc_stubs_.empty()
893 && this->cortex_a8_stubs_.empty()
894 && this->arm_v4bx_stubs_.empty());
897 // Return the current data size.
899 current_data_size() const
900 { return this->current_data_size_for_child(); }
902 // Add a STUB using KEY. The caller is responsible for avoiding addition
903 // if a STUB with the same key has already been added.
905 add_reloc_stub(Reloc_stub* stub, const Reloc_stub::Key& key)
907 const Stub_template* stub_template = stub->stub_template();
908 gold_assert(stub_template->type() == key.stub_type());
909 this->reloc_stubs_[key] = stub;
911 // Assign stub offset early. We can do this because we never remove
912 // reloc stubs and they are in the beginning of the stub table.
913 uint64_t align = stub_template->alignment();
914 this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_, align);
915 stub->set_offset(this->reloc_stubs_size_);
916 this->reloc_stubs_size_ += stub_template->size();
917 this->reloc_stubs_addralign_ =
918 std::max(this->reloc_stubs_addralign_, align);
921 // Add a Cortex-A8 STUB that fixes up a THUMB branch at ADDRESS.
922 // The caller is responsible for avoiding addition if a STUB with the same
923 // address has already been added.
925 add_cortex_a8_stub(Arm_address address, Cortex_a8_stub* stub)
927 std::pair<Arm_address, Cortex_a8_stub*> value(address, stub);
928 this->cortex_a8_stubs_.insert(value);
931 // Add an ARM V4BX relocation stub. A register index will be retrieved
934 add_arm_v4bx_stub(Arm_v4bx_stub* stub)
936 gold_assert(stub != NULL && this->arm_v4bx_stubs_[stub->reg()] == NULL);
937 this->arm_v4bx_stubs_[stub->reg()] = stub;
940 // Remove all Cortex-A8 stubs.
942 remove_all_cortex_a8_stubs();
944 // Look up a relocation stub using KEY. Return NULL if there is none.
946 find_reloc_stub(const Reloc_stub::Key& key) const
948 typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.find(key);
949 return (p != this->reloc_stubs_.end()) ? p->second : NULL;
952 // Look up an arm v4bx relocation stub using the register index.
953 // Return NULL if there is none.
955 find_arm_v4bx_stub(const uint32_t reg) const
957 gold_assert(reg < 0xf);
958 return this->arm_v4bx_stubs_[reg];
961 // Relocate stubs in this stub table.
963 relocate_stubs(const Relocate_info<32, big_endian>*,
964 Target_arm<big_endian>*, Output_section*,
965 unsigned char*, Arm_address, section_size_type);
967 // Update data size and alignment at the end of a relaxation pass. Return
968 // true if either data size or alignment is different from that of the
969 // previous relaxation pass.
971 update_data_size_and_addralign();
973 // Finalize stubs. Set the offsets of all stubs and mark input sections
974 // needing the Cortex-A8 workaround.
978 // Apply Cortex-A8 workaround to an address range.
980 apply_cortex_a8_workaround_to_address_range(Target_arm<big_endian>*,
981 unsigned char*, Arm_address,
985 // Write out section contents.
987 do_write(Output_file*);
989 // Return the required alignment.
992 { return this->prev_addralign_; }
994 // Reset address and file offset.
996 do_reset_address_and_file_offset()
997 { this->set_current_data_size_for_child(this->prev_data_size_); }
999 // Set final data size.
1001 set_final_data_size()
1002 { this->set_data_size(this->current_data_size()); }
1005 // Relocate one stub.
1007 relocate_stub(Stub*, const Relocate_info<32, big_endian>*,
1008 Target_arm<big_endian>*, Output_section*,
1009 unsigned char*, Arm_address, section_size_type);
1011 // Unordered map of relocation stubs.
1013 Unordered_map<Reloc_stub::Key, Reloc_stub*, Reloc_stub::Key::hash,
1014 Reloc_stub::Key::equal_to>
1017 // List of Cortex-A8 stubs ordered by addresses of branches being
1018 // fixed up in output.
1019 typedef std::map<Arm_address, Cortex_a8_stub*> Cortex_a8_stub_list;
1020 // List of Arm V4BX relocation stubs ordered by associated registers.
1021 typedef std::vector<Arm_v4bx_stub*> Arm_v4bx_stub_list;
1023 // Owner of this stub table.
1024 Arm_input_section<big_endian>* owner_;
1025 // The relocation stubs.
1026 Reloc_stub_map reloc_stubs_;
1027 // Size of reloc stubs.
1028 off_t reloc_stubs_size_;
1029 // Maximum address alignment of reloc stubs.
1030 uint64_t reloc_stubs_addralign_;
1031 // The cortex_a8_stubs.
1032 Cortex_a8_stub_list cortex_a8_stubs_;
1033 // The Arm V4BX relocation stubs.
1034 Arm_v4bx_stub_list arm_v4bx_stubs_;
1035 // data size of this in the previous pass.
1036 off_t prev_data_size_;
1037 // address alignment of this in the previous pass.
1038 uint64_t prev_addralign_;
1041 // Arm_exidx_cantunwind class. This represents an EXIDX_CANTUNWIND entry
1042 // we add to the end of an EXIDX input section that goes into the output.
1044 class Arm_exidx_cantunwind : public Output_section_data
1047 Arm_exidx_cantunwind(Relobj* relobj, unsigned int shndx)
1048 : Output_section_data(8, 4, true), relobj_(relobj), shndx_(shndx)
1051 // Return the object containing the section pointed by this.
1054 { return this->relobj_; }
1056 // Return the section index of the section pointed by this.
1059 { return this->shndx_; }
1063 do_write(Output_file* of)
1065 if (parameters->target().is_big_endian())
1066 this->do_fixed_endian_write<true>(of);
1068 this->do_fixed_endian_write<false>(of);
1071 // Write to a map file.
1073 do_print_to_mapfile(Mapfile* mapfile) const
1074 { mapfile->print_output_data(this, _("** ARM cantunwind")); }
1077 // Implement do_write for a given endianness.
1078 template<bool big_endian>
1080 do_fixed_endian_write(Output_file*);
1082 // The object containing the section pointed by this.
1084 // The section index of the section pointed by this.
1085 unsigned int shndx_;
1088 // During EXIDX coverage fix-up, we compact an EXIDX section. The
1089 // Offset map is used to map input section offset within the EXIDX section
1090 // to the output offset from the start of this EXIDX section.
1092 typedef std::map<section_offset_type, section_offset_type>
1093 Arm_exidx_section_offset_map;
1095 // Arm_exidx_merged_section class. This represents an EXIDX input section
1096 // with some of its entries merged.
1098 class Arm_exidx_merged_section : public Output_relaxed_input_section
1101 // Constructor for Arm_exidx_merged_section.
1102 // EXIDX_INPUT_SECTION points to the unmodified EXIDX input section.
1103 // SECTION_OFFSET_MAP points to a section offset map describing how
1104 // parts of the input section are mapped to output. DELETED_BYTES is
1105 // the number of bytes deleted from the EXIDX input section.
1106 Arm_exidx_merged_section(
1107 const Arm_exidx_input_section& exidx_input_section,
1108 const Arm_exidx_section_offset_map& section_offset_map,
1109 uint32_t deleted_bytes);
1111 // Build output contents.
1113 build_contents(const unsigned char*, section_size_type);
1115 // Return the original EXIDX input section.
1116 const Arm_exidx_input_section&
1117 exidx_input_section() const
1118 { return this->exidx_input_section_; }
1120 // Return the section offset map.
1121 const Arm_exidx_section_offset_map&
1122 section_offset_map() const
1123 { return this->section_offset_map_; }
1126 // Write merged section into file OF.
1128 do_write(Output_file* of);
1131 do_output_offset(const Relobj*, unsigned int, section_offset_type,
1132 section_offset_type*) const;
1135 // Original EXIDX input section.
1136 const Arm_exidx_input_section& exidx_input_section_;
1137 // Section offset map.
1138 const Arm_exidx_section_offset_map& section_offset_map_;
1139 // Merged section contents. We need to keep build the merged section
1140 // and save it here to avoid accessing the original EXIDX section when
1141 // we cannot lock the sections' object.
1142 unsigned char* section_contents_;
1145 // A class to wrap an ordinary input section containing executable code.
1147 template<bool big_endian>
1148 class Arm_input_section : public Output_relaxed_input_section
1151 Arm_input_section(Relobj* relobj, unsigned int shndx)
1152 : Output_relaxed_input_section(relobj, shndx, 1),
1153 original_addralign_(1), original_size_(0), stub_table_(NULL),
1154 original_contents_(NULL)
1157 ~Arm_input_section()
1158 { delete[] this->original_contents_; }
1164 // Whether this is a stub table owner.
1166 is_stub_table_owner() const
1167 { return this->stub_table_ != NULL && this->stub_table_->owner() == this; }
1169 // Return the stub table.
1170 Stub_table<big_endian>*
1172 { return this->stub_table_; }
1174 // Set the stub_table.
1176 set_stub_table(Stub_table<big_endian>* stub_table)
1177 { this->stub_table_ = stub_table; }
1179 // Downcast a base pointer to an Arm_input_section pointer. This is
1180 // not type-safe but we only use Arm_input_section not the base class.
1181 static Arm_input_section<big_endian>*
1182 as_arm_input_section(Output_relaxed_input_section* poris)
1183 { return static_cast<Arm_input_section<big_endian>*>(poris); }
1185 // Return the original size of the section.
1187 original_size() const
1188 { return this->original_size_; }
1191 // Write data to output file.
1193 do_write(Output_file*);
1195 // Return required alignment of this.
1197 do_addralign() const
1199 if (this->is_stub_table_owner())
1200 return std::max(this->stub_table_->addralign(),
1201 static_cast<uint64_t>(this->original_addralign_));
1203 return this->original_addralign_;
1206 // Finalize data size.
1208 set_final_data_size();
1210 // Reset address and file offset.
1212 do_reset_address_and_file_offset();
1216 do_output_offset(const Relobj* object, unsigned int shndx,
1217 section_offset_type offset,
1218 section_offset_type* poutput) const
1220 if ((object == this->relobj())
1221 && (shndx == this->shndx())
1224 convert_types<section_offset_type, uint32_t>(this->original_size_)))
1234 // Copying is not allowed.
1235 Arm_input_section(const Arm_input_section&);
1236 Arm_input_section& operator=(const Arm_input_section&);
1238 // Address alignment of the original input section.
1239 uint32_t original_addralign_;
1240 // Section size of the original input section.
1241 uint32_t original_size_;
1243 Stub_table<big_endian>* stub_table_;
1244 // Original section contents. We have to make a copy here since the file
1245 // containing the original section may not be locked when we need to access
1247 unsigned char* original_contents_;
1250 // Arm_exidx_fixup class. This is used to define a number of methods
1251 // and keep states for fixing up EXIDX coverage.
1253 class Arm_exidx_fixup
1256 Arm_exidx_fixup(Output_section* exidx_output_section,
1257 bool merge_exidx_entries = true)
1258 : exidx_output_section_(exidx_output_section), last_unwind_type_(UT_NONE),
1259 last_inlined_entry_(0), last_input_section_(NULL),
1260 section_offset_map_(NULL), first_output_text_section_(NULL),
1261 merge_exidx_entries_(merge_exidx_entries)
1265 { delete this->section_offset_map_; }
1267 // Process an EXIDX section for entry merging. SECTION_CONTENTS points
1268 // to the EXIDX contents and SECTION_SIZE is the size of the contents. Return
1269 // number of bytes to be deleted in output. If parts of the input EXIDX
1270 // section are merged a heap allocated Arm_exidx_section_offset_map is store
1271 // in the located PSECTION_OFFSET_MAP. The caller owns the map and is
1272 // responsible for releasing it.
1273 template<bool big_endian>
1275 process_exidx_section(const Arm_exidx_input_section* exidx_input_section,
1276 const unsigned char* section_contents,
1277 section_size_type section_size,
1278 Arm_exidx_section_offset_map** psection_offset_map);
1280 // Append an EXIDX_CANTUNWIND entry pointing at the end of the last
1281 // input section, if there is not one already.
1283 add_exidx_cantunwind_as_needed();
1285 // Return the output section for the text section which is linked to the
1286 // first exidx input in output.
1288 first_output_text_section() const
1289 { return this->first_output_text_section_; }
1292 // Copying is not allowed.
1293 Arm_exidx_fixup(const Arm_exidx_fixup&);
1294 Arm_exidx_fixup& operator=(const Arm_exidx_fixup&);
1296 // Type of EXIDX unwind entry.
1301 // EXIDX_CANTUNWIND.
1302 UT_EXIDX_CANTUNWIND,
1309 // Process an EXIDX entry. We only care about the second word of the
1310 // entry. Return true if the entry can be deleted.
1312 process_exidx_entry(uint32_t second_word);
1314 // Update the current section offset map during EXIDX section fix-up.
1315 // If there is no map, create one. INPUT_OFFSET is the offset of a
1316 // reference point, DELETED_BYTES is the number of deleted by in the
1317 // section so far. If DELETE_ENTRY is true, the reference point and
1318 // all offsets after the previous reference point are discarded.
1320 update_offset_map(section_offset_type input_offset,
1321 section_size_type deleted_bytes, bool delete_entry);
1323 // EXIDX output section.
1324 Output_section* exidx_output_section_;
1325 // Unwind type of the last EXIDX entry processed.
1326 Unwind_type last_unwind_type_;
1327 // Last seen inlined EXIDX entry.
1328 uint32_t last_inlined_entry_;
1329 // Last processed EXIDX input section.
1330 const Arm_exidx_input_section* last_input_section_;
1331 // Section offset map created in process_exidx_section.
1332 Arm_exidx_section_offset_map* section_offset_map_;
1333 // Output section for the text section which is linked to the first exidx
1335 Output_section* first_output_text_section_;
1337 bool merge_exidx_entries_;
1340 // Arm output section class. This is defined mainly to add a number of
1341 // stub generation methods.
1343 template<bool big_endian>
1344 class Arm_output_section : public Output_section
1347 typedef std::vector<std::pair<Relobj*, unsigned int> > Text_section_list;
1349 // We need to force SHF_LINK_ORDER in a SHT_ARM_EXIDX section.
1350 Arm_output_section(const char* name, elfcpp::Elf_Word type,
1351 elfcpp::Elf_Xword flags)
1352 : Output_section(name, type,
1353 (type == elfcpp::SHT_ARM_EXIDX
1354 ? flags | elfcpp::SHF_LINK_ORDER
1357 if (type == elfcpp::SHT_ARM_EXIDX)
1358 this->set_always_keeps_input_sections();
1361 ~Arm_output_section()
1364 // Group input sections for stub generation.
1366 group_sections(section_size_type, bool, Target_arm<big_endian>*, const Task*);
1368 // Downcast a base pointer to an Arm_output_section pointer. This is
1369 // not type-safe but we only use Arm_output_section not the base class.
1370 static Arm_output_section<big_endian>*
1371 as_arm_output_section(Output_section* os)
1372 { return static_cast<Arm_output_section<big_endian>*>(os); }
1374 // Append all input text sections in this into LIST.
1376 append_text_sections_to_list(Text_section_list* list);
1378 // Fix EXIDX coverage of this EXIDX output section. SORTED_TEXT_SECTION
1379 // is a list of text input sections sorted in ascending order of their
1380 // output addresses.
1382 fix_exidx_coverage(Layout* layout,
1383 const Text_section_list& sorted_text_section,
1384 Symbol_table* symtab,
1385 bool merge_exidx_entries,
1388 // Link an EXIDX section into its corresponding text section.
1390 set_exidx_section_link();
1394 typedef Output_section::Input_section Input_section;
1395 typedef Output_section::Input_section_list Input_section_list;
1397 // Create a stub group.
1398 void create_stub_group(Input_section_list::const_iterator,
1399 Input_section_list::const_iterator,
1400 Input_section_list::const_iterator,
1401 Target_arm<big_endian>*,
1402 std::vector<Output_relaxed_input_section*>*,
1406 // Arm_exidx_input_section class. This represents an EXIDX input section.
1408 class Arm_exidx_input_section
1411 static const section_offset_type invalid_offset =
1412 static_cast<section_offset_type>(-1);
1414 Arm_exidx_input_section(Relobj* relobj, unsigned int shndx,
1415 unsigned int link, uint32_t size,
1416 uint32_t addralign, uint32_t text_size)
1417 : relobj_(relobj), shndx_(shndx), link_(link), size_(size),
1418 addralign_(addralign), text_size_(text_size), has_errors_(false)
1421 ~Arm_exidx_input_section()
1424 // Accessors: This is a read-only class.
1426 // Return the object containing this EXIDX input section.
1429 { return this->relobj_; }
1431 // Return the section index of this EXIDX input section.
1434 { return this->shndx_; }
1436 // Return the section index of linked text section in the same object.
1439 { return this->link_; }
1441 // Return size of the EXIDX input section.
1444 { return this->size_; }
1446 // Return address alignment of EXIDX input section.
1449 { return this->addralign_; }
1451 // Return size of the associated text input section.
1454 { return this->text_size_; }
1456 // Whether there are any errors in the EXIDX input section.
1459 { return this->has_errors_; }
1461 // Set has-errors flag.
1464 { this->has_errors_ = true; }
1467 // Object containing this.
1469 // Section index of this.
1470 unsigned int shndx_;
1471 // text section linked to this in the same object.
1473 // Size of this. For ARM 32-bit is sufficient.
1475 // Address alignment of this. For ARM 32-bit is sufficient.
1476 uint32_t addralign_;
1477 // Size of associated text section.
1478 uint32_t text_size_;
1479 // Whether this has any errors.
1483 // Arm_relobj class.
1485 template<bool big_endian>
1486 class Arm_relobj : public Sized_relobj_file<32, big_endian>
1489 static const Arm_address invalid_address = static_cast<Arm_address>(-1);
1491 Arm_relobj(const std::string& name, Input_file* input_file, off_t offset,
1492 const typename elfcpp::Ehdr<32, big_endian>& ehdr)
1493 : Sized_relobj_file<32, big_endian>(name, input_file, offset, ehdr),
1494 stub_tables_(), local_symbol_is_thumb_function_(),
1495 attributes_section_data_(NULL), mapping_symbols_info_(),
1496 section_has_cortex_a8_workaround_(NULL), exidx_section_map_(),
1497 output_local_symbol_count_needs_update_(false),
1498 merge_flags_and_attributes_(true)
1502 { delete this->attributes_section_data_; }
1504 // Return the stub table of the SHNDX-th section if there is one.
1505 Stub_table<big_endian>*
1506 stub_table(unsigned int shndx) const
1508 gold_assert(shndx < this->stub_tables_.size());
1509 return this->stub_tables_[shndx];
1512 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1514 set_stub_table(unsigned int shndx, Stub_table<big_endian>* stub_table)
1516 gold_assert(shndx < this->stub_tables_.size());
1517 this->stub_tables_[shndx] = stub_table;
1520 // Whether a local symbol is a THUMB function. R_SYM is the symbol table
1521 // index. This is only valid after do_count_local_symbol is called.
1523 local_symbol_is_thumb_function(unsigned int r_sym) const
1525 gold_assert(r_sym < this->local_symbol_is_thumb_function_.size());
1526 return this->local_symbol_is_thumb_function_[r_sym];
1529 // Scan all relocation sections for stub generation.
1531 scan_sections_for_stubs(Target_arm<big_endian>*, const Symbol_table*,
1534 // Convert regular input section with index SHNDX to a relaxed section.
1536 convert_input_section_to_relaxed_section(unsigned shndx)
1538 // The stubs have relocations and we need to process them after writing
1539 // out the stubs. So relocation now must follow section write.
1540 this->set_section_offset(shndx, -1ULL);
1541 this->set_relocs_must_follow_section_writes();
1544 // Downcast a base pointer to an Arm_relobj pointer. This is
1545 // not type-safe but we only use Arm_relobj not the base class.
1546 static Arm_relobj<big_endian>*
1547 as_arm_relobj(Relobj* relobj)
1548 { return static_cast<Arm_relobj<big_endian>*>(relobj); }
1550 // Processor-specific flags in ELF file header. This is valid only after
1553 processor_specific_flags() const
1554 { return this->processor_specific_flags_; }
1556 // Attribute section data This is the contents of the .ARM.attribute section
1558 const Attributes_section_data*
1559 attributes_section_data() const
1560 { return this->attributes_section_data_; }
1562 // Mapping symbol location.
1563 typedef std::pair<unsigned int, Arm_address> Mapping_symbol_position;
1565 // Functor for STL container.
1566 struct Mapping_symbol_position_less
1569 operator()(const Mapping_symbol_position& p1,
1570 const Mapping_symbol_position& p2) const
1572 return (p1.first < p2.first
1573 || (p1.first == p2.first && p1.second < p2.second));
1577 // We only care about the first character of a mapping symbol, so
1578 // we only store that instead of the whole symbol name.
1579 typedef std::map<Mapping_symbol_position, char,
1580 Mapping_symbol_position_less> Mapping_symbols_info;
1582 // Whether a section contains any Cortex-A8 workaround.
1584 section_has_cortex_a8_workaround(unsigned int shndx) const
1586 return (this->section_has_cortex_a8_workaround_ != NULL
1587 && (*this->section_has_cortex_a8_workaround_)[shndx]);
1590 // Mark a section that has Cortex-A8 workaround.
1592 mark_section_for_cortex_a8_workaround(unsigned int shndx)
1594 if (this->section_has_cortex_a8_workaround_ == NULL)
1595 this->section_has_cortex_a8_workaround_ =
1596 new std::vector<bool>(this->shnum(), false);
1597 (*this->section_has_cortex_a8_workaround_)[shndx] = true;
1600 // Return the EXIDX section of an text section with index SHNDX or NULL
1601 // if the text section has no associated EXIDX section.
1602 const Arm_exidx_input_section*
1603 exidx_input_section_by_link(unsigned int shndx) const
1605 Exidx_section_map::const_iterator p = this->exidx_section_map_.find(shndx);
1606 return ((p != this->exidx_section_map_.end()
1607 && p->second->link() == shndx)
1612 // Return the EXIDX section with index SHNDX or NULL if there is none.
1613 const Arm_exidx_input_section*
1614 exidx_input_section_by_shndx(unsigned shndx) const
1616 Exidx_section_map::const_iterator p = this->exidx_section_map_.find(shndx);
1617 return ((p != this->exidx_section_map_.end()
1618 && p->second->shndx() == shndx)
1623 // Whether output local symbol count needs updating.
1625 output_local_symbol_count_needs_update() const
1626 { return this->output_local_symbol_count_needs_update_; }
1628 // Set output_local_symbol_count_needs_update flag to be true.
1630 set_output_local_symbol_count_needs_update()
1631 { this->output_local_symbol_count_needs_update_ = true; }
1633 // Update output local symbol count at the end of relaxation.
1635 update_output_local_symbol_count();
1637 // Whether we want to merge processor-specific flags and attributes.
1639 merge_flags_and_attributes() const
1640 { return this->merge_flags_and_attributes_; }
1642 // Export list of EXIDX section indices.
1644 get_exidx_shndx_list(std::vector<unsigned int>* list) const
1647 for (Exidx_section_map::const_iterator p = this->exidx_section_map_.begin();
1648 p != this->exidx_section_map_.end();
1651 if (p->second->shndx() == p->first)
1652 list->push_back(p->first);
1654 // Sort list to make result independent of implementation of map.
1655 std::sort(list->begin(), list->end());
1659 // Post constructor setup.
1663 // Call parent's setup method.
1664 Sized_relobj_file<32, big_endian>::do_setup();
1666 // Initialize look-up tables.
1667 Stub_table_list empty_stub_table_list(this->shnum(), NULL);
1668 this->stub_tables_.swap(empty_stub_table_list);
1671 // Count the local symbols.
1673 do_count_local_symbols(Stringpool_template<char>*,
1674 Stringpool_template<char>*);
1677 do_relocate_sections(
1678 const Symbol_table* symtab, const Layout* layout,
1679 const unsigned char* pshdrs, Output_file* of,
1680 typename Sized_relobj_file<32, big_endian>::Views* pivews);
1682 // Read the symbol information.
1684 do_read_symbols(Read_symbols_data* sd);
1686 // Process relocs for garbage collection.
1688 do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*);
1692 // Whether a section needs to be scanned for relocation stubs.
1694 section_needs_reloc_stub_scanning(const elfcpp::Shdr<32, big_endian>&,
1695 const Relobj::Output_sections&,
1696 const Symbol_table*, const unsigned char*);
1698 // Whether a section is a scannable text section.
1700 section_is_scannable(const elfcpp::Shdr<32, big_endian>&, unsigned int,
1701 const Output_section*, const Symbol_table*);
1703 // Whether a section needs to be scanned for the Cortex-A8 erratum.
1705 section_needs_cortex_a8_stub_scanning(const elfcpp::Shdr<32, big_endian>&,
1706 unsigned int, Output_section*,
1707 const Symbol_table*);
1709 // Scan a section for the Cortex-A8 erratum.
1711 scan_section_for_cortex_a8_erratum(const elfcpp::Shdr<32, big_endian>&,
1712 unsigned int, Output_section*,
1713 Target_arm<big_endian>*);
1715 // Find the linked text section of an EXIDX section by looking at the
1716 // first relocation of the EXIDX section. PSHDR points to the section
1717 // headers of a relocation section and PSYMS points to the local symbols.
1718 // PSHNDX points to a location storing the text section index if found.
1719 // Return whether we can find the linked section.
1721 find_linked_text_section(const unsigned char* pshdr,
1722 const unsigned char* psyms, unsigned int* pshndx);
1725 // Make a new Arm_exidx_input_section object for EXIDX section with
1726 // index SHNDX and section header SHDR. TEXT_SHNDX is the section
1727 // index of the linked text section.
1729 make_exidx_input_section(unsigned int shndx,
1730 const elfcpp::Shdr<32, big_endian>& shdr,
1731 unsigned int text_shndx,
1732 const elfcpp::Shdr<32, big_endian>& text_shdr);
1734 // Return the output address of either a plain input section or a
1735 // relaxed input section. SHNDX is the section index.
1737 simple_input_section_output_address(unsigned int, Output_section*);
1739 typedef std::vector<Stub_table<big_endian>*> Stub_table_list;
1740 typedef Unordered_map<unsigned int, const Arm_exidx_input_section*>
1743 // List of stub tables.
1744 Stub_table_list stub_tables_;
1745 // Bit vector to tell if a local symbol is a thumb function or not.
1746 // This is only valid after do_count_local_symbol is called.
1747 std::vector<bool> local_symbol_is_thumb_function_;
1748 // processor-specific flags in ELF file header.
1749 elfcpp::Elf_Word processor_specific_flags_;
1750 // Object attributes if there is an .ARM.attributes section or NULL.
1751 Attributes_section_data* attributes_section_data_;
1752 // Mapping symbols information.
1753 Mapping_symbols_info mapping_symbols_info_;
1754 // Bitmap to indicate sections with Cortex-A8 workaround or NULL.
1755 std::vector<bool>* section_has_cortex_a8_workaround_;
1756 // Map a text section to its associated .ARM.exidx section, if there is one.
1757 Exidx_section_map exidx_section_map_;
1758 // Whether output local symbol count needs updating.
1759 bool output_local_symbol_count_needs_update_;
1760 // Whether we merge processor flags and attributes of this object to
1762 bool merge_flags_and_attributes_;
1765 // Arm_dynobj class.
1767 template<bool big_endian>
1768 class Arm_dynobj : public Sized_dynobj<32, big_endian>
1771 Arm_dynobj(const std::string& name, Input_file* input_file, off_t offset,
1772 const elfcpp::Ehdr<32, big_endian>& ehdr)
1773 : Sized_dynobj<32, big_endian>(name, input_file, offset, ehdr),
1774 processor_specific_flags_(0), attributes_section_data_(NULL)
1778 { delete this->attributes_section_data_; }
1780 // Downcast a base pointer to an Arm_relobj pointer. This is
1781 // not type-safe but we only use Arm_relobj not the base class.
1782 static Arm_dynobj<big_endian>*
1783 as_arm_dynobj(Dynobj* dynobj)
1784 { return static_cast<Arm_dynobj<big_endian>*>(dynobj); }
1786 // Processor-specific flags in ELF file header. This is valid only after
1789 processor_specific_flags() const
1790 { return this->processor_specific_flags_; }
1792 // Attributes section data.
1793 const Attributes_section_data*
1794 attributes_section_data() const
1795 { return this->attributes_section_data_; }
1798 // Read the symbol information.
1800 do_read_symbols(Read_symbols_data* sd);
1803 // processor-specific flags in ELF file header.
1804 elfcpp::Elf_Word processor_specific_flags_;
1805 // Object attributes if there is an .ARM.attributes section or NULL.
1806 Attributes_section_data* attributes_section_data_;
1809 // Functor to read reloc addends during stub generation.
1811 template<int sh_type, bool big_endian>
1812 struct Stub_addend_reader
1814 // Return the addend for a relocation of a particular type. Depending
1815 // on whether this is a REL or RELA relocation, read the addend from a
1816 // view or from a Reloc object.
1817 elfcpp::Elf_types<32>::Elf_Swxword
1819 unsigned int /* r_type */,
1820 const unsigned char* /* view */,
1821 const typename Reloc_types<sh_type,
1822 32, big_endian>::Reloc& /* reloc */) const;
1825 // Specialized Stub_addend_reader for SHT_REL type relocation sections.
1827 template<bool big_endian>
1828 struct Stub_addend_reader<elfcpp::SHT_REL, big_endian>
1830 elfcpp::Elf_types<32>::Elf_Swxword
1833 const unsigned char*,
1834 const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const;
1837 // Specialized Stub_addend_reader for RELA type relocation sections.
1838 // We currently do not handle RELA type relocation sections but it is trivial
1839 // to implement the addend reader. This is provided for completeness and to
1840 // make it easier to add support for RELA relocation sections in the future.
1842 template<bool big_endian>
1843 struct Stub_addend_reader<elfcpp::SHT_RELA, big_endian>
1845 elfcpp::Elf_types<32>::Elf_Swxword
1848 const unsigned char*,
1849 const typename Reloc_types<elfcpp::SHT_RELA, 32,
1850 big_endian>::Reloc& reloc) const
1851 { return reloc.get_r_addend(); }
1854 // Cortex_a8_reloc class. We keep record of relocation that may need
1855 // the Cortex-A8 erratum workaround.
1857 class Cortex_a8_reloc
1860 Cortex_a8_reloc(Reloc_stub* reloc_stub, unsigned r_type,
1861 Arm_address destination)
1862 : reloc_stub_(reloc_stub), r_type_(r_type), destination_(destination)
1868 // Accessors: This is a read-only class.
1870 // Return the relocation stub associated with this relocation if there is
1874 { return this->reloc_stub_; }
1876 // Return the relocation type.
1879 { return this->r_type_; }
1881 // Return the destination address of the relocation. LSB stores the THUMB
1885 { return this->destination_; }
1888 // Associated relocation stub if there is one, or NULL.
1889 const Reloc_stub* reloc_stub_;
1891 unsigned int r_type_;
1892 // Destination address of this relocation. LSB is used to distinguish
1894 Arm_address destination_;
1897 // Arm_output_data_got class. We derive this from Output_data_got to add
1898 // extra methods to handle TLS relocations in a static link.
1900 template<bool big_endian>
1901 class Arm_output_data_got : public Output_data_got<32, big_endian>
1904 Arm_output_data_got(Symbol_table* symtab, Layout* layout)
1905 : Output_data_got<32, big_endian>(), symbol_table_(symtab), layout_(layout)
1908 // Add a static entry for the GOT entry at OFFSET. GSYM is a global
1909 // symbol and R_TYPE is the code of a dynamic relocation that needs to be
1910 // applied in a static link.
1912 add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
1913 { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); }
1915 // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object
1916 // defining a local symbol with INDEX. R_TYPE is the code of a dynamic
1917 // relocation that needs to be applied in a static link.
1919 add_static_reloc(unsigned int got_offset, unsigned int r_type,
1920 Sized_relobj_file<32, big_endian>* relobj,
1923 this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj,
1927 // Add a GOT pair for R_ARM_TLS_GD32. The creates a pair of GOT entries.
1928 // The first one is initialized to be 1, which is the module index for
1929 // the main executable and the second one 0. A reloc of the type
1930 // R_ARM_TLS_DTPOFF32 will be created for the second GOT entry and will
1931 // be applied by gold. GSYM is a global symbol.
1933 add_tls_gd32_with_static_reloc(unsigned int got_type, Symbol* gsym);
1935 // Same as the above but for a local symbol in OBJECT with INDEX.
1937 add_tls_gd32_with_static_reloc(unsigned int got_type,
1938 Sized_relobj_file<32, big_endian>* object,
1939 unsigned int index);
1942 // Write out the GOT table.
1944 do_write(Output_file*);
1947 // This class represent dynamic relocations that need to be applied by
1948 // gold because we are using TLS relocations in a static link.
1952 Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
1953 : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true)
1954 { this->u_.global.symbol = gsym; }
1956 Static_reloc(unsigned int got_offset, unsigned int r_type,
1957 Sized_relobj_file<32, big_endian>* relobj, unsigned int index)
1958 : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false)
1960 this->u_.local.relobj = relobj;
1961 this->u_.local.index = index;
1964 // Return the GOT offset.
1967 { return this->got_offset_; }
1972 { return this->r_type_; }
1974 // Whether the symbol is global or not.
1976 symbol_is_global() const
1977 { return this->symbol_is_global_; }
1979 // For a relocation against a global symbol, the global symbol.
1983 gold_assert(this->symbol_is_global_);
1984 return this->u_.global.symbol;
1987 // For a relocation against a local symbol, the defining object.
1988 Sized_relobj_file<32, big_endian>*
1991 gold_assert(!this->symbol_is_global_);
1992 return this->u_.local.relobj;
1995 // For a relocation against a local symbol, the local symbol index.
1999 gold_assert(!this->symbol_is_global_);
2000 return this->u_.local.index;
2004 // GOT offset of the entry to which this relocation is applied.
2005 unsigned int got_offset_;
2006 // Type of relocation.
2007 unsigned int r_type_;
2008 // Whether this relocation is against a global symbol.
2009 bool symbol_is_global_;
2010 // A global or local symbol.
2015 // For a global symbol, the symbol itself.
2020 // For a local symbol, the object defining object.
2021 Sized_relobj_file<32, big_endian>* relobj;
2022 // For a local symbol, the symbol index.
2028 // Symbol table of the output object.
2029 Symbol_table* symbol_table_;
2030 // Layout of the output object.
2032 // Static relocs to be applied to the GOT.
2033 std::vector<Static_reloc> static_relocs_;
2036 // The ARM target has many relocation types with odd-sizes or noncontiguous
2037 // bits. The default handling of relocatable relocation cannot process these
2038 // relocations. So we have to extend the default code.
2040 template<bool big_endian, int sh_type, typename Classify_reloc>
2041 class Arm_scan_relocatable_relocs :
2042 public Default_scan_relocatable_relocs<sh_type, Classify_reloc>
2045 // Return the strategy to use for a local symbol which is a section
2046 // symbol, given the relocation type.
2047 inline Relocatable_relocs::Reloc_strategy
2048 local_section_strategy(unsigned int r_type, Relobj*)
2050 if (sh_type == elfcpp::SHT_RELA)
2051 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
2054 if (r_type == elfcpp::R_ARM_TARGET1
2055 || r_type == elfcpp::R_ARM_TARGET2)
2057 const Target_arm<big_endian>* arm_target =
2058 Target_arm<big_endian>::default_target();
2059 r_type = arm_target->get_real_reloc_type(r_type);
2064 // Relocations that write nothing. These exclude R_ARM_TARGET1
2065 // and R_ARM_TARGET2.
2066 case elfcpp::R_ARM_NONE:
2067 case elfcpp::R_ARM_V4BX:
2068 case elfcpp::R_ARM_TLS_GOTDESC:
2069 case elfcpp::R_ARM_TLS_CALL:
2070 case elfcpp::R_ARM_TLS_DESCSEQ:
2071 case elfcpp::R_ARM_THM_TLS_CALL:
2072 case elfcpp::R_ARM_GOTRELAX:
2073 case elfcpp::R_ARM_GNU_VTENTRY:
2074 case elfcpp::R_ARM_GNU_VTINHERIT:
2075 case elfcpp::R_ARM_THM_TLS_DESCSEQ16:
2076 case elfcpp::R_ARM_THM_TLS_DESCSEQ32:
2077 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
2078 // These should have been converted to something else above.
2079 case elfcpp::R_ARM_TARGET1:
2080 case elfcpp::R_ARM_TARGET2:
2082 // Relocations that write full 32 bits and
2083 // have alignment of 1.
2084 case elfcpp::R_ARM_ABS32:
2085 case elfcpp::R_ARM_REL32:
2086 case elfcpp::R_ARM_SBREL32:
2087 case elfcpp::R_ARM_GOTOFF32:
2088 case elfcpp::R_ARM_BASE_PREL:
2089 case elfcpp::R_ARM_GOT_BREL:
2090 case elfcpp::R_ARM_BASE_ABS:
2091 case elfcpp::R_ARM_ABS32_NOI:
2092 case elfcpp::R_ARM_REL32_NOI:
2093 case elfcpp::R_ARM_PLT32_ABS:
2094 case elfcpp::R_ARM_GOT_ABS:
2095 case elfcpp::R_ARM_GOT_PREL:
2096 case elfcpp::R_ARM_TLS_GD32:
2097 case elfcpp::R_ARM_TLS_LDM32:
2098 case elfcpp::R_ARM_TLS_LDO32:
2099 case elfcpp::R_ARM_TLS_IE32:
2100 case elfcpp::R_ARM_TLS_LE32:
2101 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_4_UNALIGNED;
2103 // For all other static relocations, return RELOC_SPECIAL.
2104 return Relocatable_relocs::RELOC_SPECIAL;
2110 template<bool big_endian>
2111 class Target_arm : public Sized_target<32, big_endian>
2114 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
2117 // When were are relocating a stub, we pass this as the relocation number.
2118 static const size_t fake_relnum_for_stubs = static_cast<size_t>(-1);
2120 Target_arm(const Target::Target_info* info = &arm_info)
2121 : Sized_target<32, big_endian>(info),
2122 got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL),
2123 copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL),
2124 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false),
2125 stub_tables_(), stub_factory_(Stub_factory::get_instance()),
2126 should_force_pic_veneer_(false),
2127 arm_input_section_map_(), attributes_section_data_(NULL),
2128 fix_cortex_a8_(false), cortex_a8_relocs_info_()
2131 // Whether we force PCI branch veneers.
2133 should_force_pic_veneer() const
2134 { return this->should_force_pic_veneer_; }
2136 // Set PIC veneer flag.
2138 set_should_force_pic_veneer(bool value)
2139 { this->should_force_pic_veneer_ = value; }
2141 // Whether we use THUMB-2 instructions.
2143 using_thumb2() const
2145 Object_attribute* attr =
2146 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
2147 int arch = attr->int_value();
2148 return arch == elfcpp::TAG_CPU_ARCH_V6T2 || arch >= elfcpp::TAG_CPU_ARCH_V7;
2151 // Whether we use THUMB/THUMB-2 instructions only.
2153 using_thumb_only() const
2155 Object_attribute* attr =
2156 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
2158 if (attr->int_value() == elfcpp::TAG_CPU_ARCH_V6_M
2159 || attr->int_value() == elfcpp::TAG_CPU_ARCH_V6S_M)
2161 if (attr->int_value() != elfcpp::TAG_CPU_ARCH_V7
2162 && attr->int_value() != elfcpp::TAG_CPU_ARCH_V7E_M)
2164 attr = this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile);
2165 return attr->int_value() == 'M';
2168 // Whether we have an NOP instruction. If not, use mov r0, r0 instead.
2170 may_use_arm_nop() const
2172 Object_attribute* attr =
2173 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
2174 int arch = attr->int_value();
2175 return (arch == elfcpp::TAG_CPU_ARCH_V6T2
2176 || arch == elfcpp::TAG_CPU_ARCH_V6K
2177 || arch == elfcpp::TAG_CPU_ARCH_V7
2178 || arch == elfcpp::TAG_CPU_ARCH_V7E_M);
2181 // Whether we have THUMB-2 NOP.W instruction.
2183 may_use_thumb2_nop() const
2185 Object_attribute* attr =
2186 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
2187 int arch = attr->int_value();
2188 return (arch == elfcpp::TAG_CPU_ARCH_V6T2
2189 || arch == elfcpp::TAG_CPU_ARCH_V7
2190 || arch == elfcpp::TAG_CPU_ARCH_V7E_M);
2193 // Whether we have v4T interworking instructions available.
2195 may_use_v4t_interworking() const
2197 Object_attribute* attr =
2198 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
2199 int arch = attr->int_value();
2200 return (arch != elfcpp::TAG_CPU_ARCH_PRE_V4
2201 && arch != elfcpp::TAG_CPU_ARCH_V4);
2204 // Whether we have v5T interworking instructions available.
2206 may_use_v5t_interworking() const
2208 Object_attribute* attr =
2209 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
2210 int arch = attr->int_value();
2211 if (parameters->options().fix_arm1176())
2212 return (arch == elfcpp::TAG_CPU_ARCH_V6T2
2213 || arch == elfcpp::TAG_CPU_ARCH_V7
2214 || arch == elfcpp::TAG_CPU_ARCH_V6_M
2215 || arch == elfcpp::TAG_CPU_ARCH_V6S_M
2216 || arch == elfcpp::TAG_CPU_ARCH_V7E_M);
2218 return (arch != elfcpp::TAG_CPU_ARCH_PRE_V4
2219 && arch != elfcpp::TAG_CPU_ARCH_V4
2220 && arch != elfcpp::TAG_CPU_ARCH_V4T);
2223 // Process the relocations to determine unreferenced sections for
2224 // garbage collection.
2226 gc_process_relocs(Symbol_table* symtab,
2228 Sized_relobj_file<32, big_endian>* object,
2229 unsigned int data_shndx,
2230 unsigned int sh_type,
2231 const unsigned char* prelocs,
2233 Output_section* output_section,
2234 bool needs_special_offset_handling,
2235 size_t local_symbol_count,
2236 const unsigned char* plocal_symbols);
2238 // Scan the relocations to look for symbol adjustments.
2240 scan_relocs(Symbol_table* symtab,
2242 Sized_relobj_file<32, big_endian>* object,
2243 unsigned int data_shndx,
2244 unsigned int sh_type,
2245 const unsigned char* prelocs,
2247 Output_section* output_section,
2248 bool needs_special_offset_handling,
2249 size_t local_symbol_count,
2250 const unsigned char* plocal_symbols);
2252 // Finalize the sections.
2254 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2256 // Return the value to use for a dynamic symbol which requires special
2259 do_dynsym_value(const Symbol*) const;
2261 // Relocate a section.
2263 relocate_section(const Relocate_info<32, big_endian>*,
2264 unsigned int sh_type,
2265 const unsigned char* prelocs,
2267 Output_section* output_section,
2268 bool needs_special_offset_handling,
2269 unsigned char* view,
2270 Arm_address view_address,
2271 section_size_type view_size,
2272 const Reloc_symbol_changes*);
2274 // Scan the relocs during a relocatable link.
2276 scan_relocatable_relocs(Symbol_table* symtab,
2278 Sized_relobj_file<32, big_endian>* object,
2279 unsigned int data_shndx,
2280 unsigned int sh_type,
2281 const unsigned char* prelocs,
2283 Output_section* output_section,
2284 bool needs_special_offset_handling,
2285 size_t local_symbol_count,
2286 const unsigned char* plocal_symbols,
2287 Relocatable_relocs*);
2289 // Emit relocations for a section.
2291 relocate_relocs(const Relocate_info<32, big_endian>*,
2292 unsigned int sh_type,
2293 const unsigned char* prelocs,
2295 Output_section* output_section,
2296 typename elfcpp::Elf_types<32>::Elf_Off
2297 offset_in_output_section,
2298 const Relocatable_relocs*,
2299 unsigned char* view,
2300 Arm_address view_address,
2301 section_size_type view_size,
2302 unsigned char* reloc_view,
2303 section_size_type reloc_view_size);
2305 // Perform target-specific processing in a relocatable link. This is
2306 // only used if we use the relocation strategy RELOC_SPECIAL.
2308 relocate_special_relocatable(const Relocate_info<32, big_endian>* relinfo,
2309 unsigned int sh_type,
2310 const unsigned char* preloc_in,
2312 Output_section* output_section,
2313 typename elfcpp::Elf_types<32>::Elf_Off
2314 offset_in_output_section,
2315 unsigned char* view,
2316 typename elfcpp::Elf_types<32>::Elf_Addr
2318 section_size_type view_size,
2319 unsigned char* preloc_out);
2321 // Return whether SYM is defined by the ABI.
2323 do_is_defined_by_abi(const Symbol* sym) const
2324 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
2326 // Return whether there is a GOT section.
2328 has_got_section() const
2329 { return this->got_ != NULL; }
2331 // Return the size of the GOT section.
2335 gold_assert(this->got_ != NULL);
2336 return this->got_->data_size();
2339 // Return the number of entries in the GOT.
2341 got_entry_count() const
2343 if (!this->has_got_section())
2345 return this->got_size() / 4;
2348 // Return the number of entries in the PLT.
2350 plt_entry_count() const;
2352 // Return the offset of the first non-reserved PLT entry.
2354 first_plt_entry_offset() const;
2356 // Return the size of each PLT entry.
2358 plt_entry_size() const;
2360 // Map platform-specific reloc types
2362 get_real_reloc_type(unsigned int r_type);
2365 // Methods to support stub-generations.
2368 // Return the stub factory
2370 stub_factory() const
2371 { return this->stub_factory_; }
2373 // Make a new Arm_input_section object.
2374 Arm_input_section<big_endian>*
2375 new_arm_input_section(Relobj*, unsigned int);
2377 // Find the Arm_input_section object corresponding to the SHNDX-th input
2378 // section of RELOBJ.
2379 Arm_input_section<big_endian>*
2380 find_arm_input_section(Relobj* relobj, unsigned int shndx) const;
2382 // Make a new Stub_table
2383 Stub_table<big_endian>*
2384 new_stub_table(Arm_input_section<big_endian>*);
2386 // Scan a section for stub generation.
2388 scan_section_for_stubs(const Relocate_info<32, big_endian>*, unsigned int,
2389 const unsigned char*, size_t, Output_section*,
2390 bool, const unsigned char*, Arm_address,
2395 relocate_stub(Stub*, const Relocate_info<32, big_endian>*,
2396 Output_section*, unsigned char*, Arm_address,
2399 // Get the default ARM target.
2400 static Target_arm<big_endian>*
2403 gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM
2404 && parameters->target().is_big_endian() == big_endian);
2405 return static_cast<Target_arm<big_endian>*>(
2406 parameters->sized_target<32, big_endian>());
2409 // Whether NAME belongs to a mapping symbol.
2411 is_mapping_symbol_name(const char* name)
2415 && (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
2416 && (name[2] == '\0' || name[2] == '.'));
2419 // Whether we work around the Cortex-A8 erratum.
2421 fix_cortex_a8() const
2422 { return this->fix_cortex_a8_; }
2424 // Whether we merge exidx entries in debuginfo.
2426 merge_exidx_entries() const
2427 { return parameters->options().merge_exidx_entries(); }
2429 // Whether we fix R_ARM_V4BX relocation.
2431 // 1 - replace with MOV instruction (armv4 target)
2432 // 2 - make interworking veneer (>= armv4t targets only)
2433 General_options::Fix_v4bx
2435 { return parameters->options().fix_v4bx(); }
2437 // Scan a span of THUMB code section for Cortex-A8 erratum.
2439 scan_span_for_cortex_a8_erratum(Arm_relobj<big_endian>*, unsigned int,
2440 section_size_type, section_size_type,
2441 const unsigned char*, Arm_address);
2443 // Apply Cortex-A8 workaround to a branch.
2445 apply_cortex_a8_workaround(const Cortex_a8_stub*, Arm_address,
2446 unsigned char*, Arm_address);
2449 // Make the PLT-generator object.
2450 Output_data_plt_arm<big_endian>*
2451 make_data_plt(Layout* layout, Output_data_space* got_plt)
2452 { return this->do_make_data_plt(layout, got_plt); }
2454 // Make an ELF object.
2456 do_make_elf_object(const std::string&, Input_file*, off_t,
2457 const elfcpp::Ehdr<32, big_endian>& ehdr);
2460 do_make_elf_object(const std::string&, Input_file*, off_t,
2461 const elfcpp::Ehdr<32, !big_endian>&)
2462 { gold_unreachable(); }
2465 do_make_elf_object(const std::string&, Input_file*, off_t,
2466 const elfcpp::Ehdr<64, false>&)
2467 { gold_unreachable(); }
2470 do_make_elf_object(const std::string&, Input_file*, off_t,
2471 const elfcpp::Ehdr<64, true>&)
2472 { gold_unreachable(); }
2474 // Make an output section.
2476 do_make_output_section(const char* name, elfcpp::Elf_Word type,
2477 elfcpp::Elf_Xword flags)
2478 { return new Arm_output_section<big_endian>(name, type, flags); }
2481 do_adjust_elf_header(unsigned char* view, int len);
2483 // We only need to generate stubs, and hence perform relaxation if we are
2484 // not doing relocatable linking.
2486 do_may_relax() const
2487 { return !parameters->options().relocatable(); }
2490 do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
2492 // Determine whether an object attribute tag takes an integer, a
2495 do_attribute_arg_type(int tag) const;
2497 // Reorder tags during output.
2499 do_attributes_order(int num) const;
2501 // This is called when the target is selected as the default.
2503 do_select_as_default_target()
2505 // No locking is required since there should only be one default target.
2506 // We cannot have both the big-endian and little-endian ARM targets
2508 gold_assert(arm_reloc_property_table == NULL);
2509 arm_reloc_property_table = new Arm_reloc_property_table();
2512 // Virtual function which is set to return true by a target if
2513 // it can use relocation types to determine if a function's
2514 // pointer is taken.
2516 do_can_check_for_function_pointers() const
2519 // Whether a section called SECTION_NAME may have function pointers to
2520 // sections not eligible for safe ICF folding.
2522 do_section_may_have_icf_unsafe_pointers(const char* section_name) const
2524 return (!is_prefix_of(".ARM.exidx", section_name)
2525 && !is_prefix_of(".ARM.extab", section_name)
2526 && Target::do_section_may_have_icf_unsafe_pointers(section_name));
2530 do_define_standard_symbols(Symbol_table*, Layout*);
2532 virtual Output_data_plt_arm<big_endian>*
2533 do_make_data_plt(Layout* layout, Output_data_space* got_plt)
2535 return new Output_data_plt_arm_standard<big_endian>(layout, got_plt);
2539 // The class which scans relocations.
2544 : issued_non_pic_error_(false)
2548 get_reference_flags(unsigned int r_type);
2551 local(Symbol_table* symtab, Layout* layout, Target_arm* target,
2552 Sized_relobj_file<32, big_endian>* object,
2553 unsigned int data_shndx,
2554 Output_section* output_section,
2555 const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
2556 const elfcpp::Sym<32, big_endian>& lsym,
2560 global(Symbol_table* symtab, Layout* layout, Target_arm* target,
2561 Sized_relobj_file<32, big_endian>* object,
2562 unsigned int data_shndx,
2563 Output_section* output_section,
2564 const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
2568 local_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_arm* ,
2569 Sized_relobj_file<32, big_endian>* ,
2572 const elfcpp::Rel<32, big_endian>& ,
2574 const elfcpp::Sym<32, big_endian>&);
2577 global_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_arm* ,
2578 Sized_relobj_file<32, big_endian>* ,
2581 const elfcpp::Rel<32, big_endian>& ,
2582 unsigned int , Symbol*);
2586 unsupported_reloc_local(Sized_relobj_file<32, big_endian>*,
2587 unsigned int r_type);
2590 unsupported_reloc_global(Sized_relobj_file<32, big_endian>*,
2591 unsigned int r_type, Symbol*);
2594 check_non_pic(Relobj*, unsigned int r_type);
2596 // Almost identical to Symbol::needs_plt_entry except that it also
2597 // handles STT_ARM_TFUNC.
2599 symbol_needs_plt_entry(const Symbol* sym)
2601 // An undefined symbol from an executable does not need a PLT entry.
2602 if (sym->is_undefined() && !parameters->options().shared())
2605 return (!parameters->doing_static_link()
2606 && (sym->type() == elfcpp::STT_FUNC
2607 || sym->type() == elfcpp::STT_ARM_TFUNC)
2608 && (sym->is_from_dynobj()
2609 || sym->is_undefined()
2610 || sym->is_preemptible()));
2614 possible_function_pointer_reloc(unsigned int r_type);
2616 // Whether we have issued an error about a non-PIC compilation.
2617 bool issued_non_pic_error_;
2620 // The class which implements relocation.
2630 // Return whether the static relocation needs to be applied.
2632 should_apply_static_reloc(const Sized_symbol<32>* gsym,
2633 unsigned int r_type,
2635 Output_section* output_section);
2637 // Do a relocation. Return false if the caller should not issue
2638 // any warnings about this relocation.
2640 relocate(const Relocate_info<32, big_endian>*, Target_arm*,
2641 Output_section*, size_t relnum,
2642 const elfcpp::Rel<32, big_endian>&,
2643 unsigned int r_type, const Sized_symbol<32>*,
2644 const Symbol_value<32>*,
2645 unsigned char*, Arm_address,
2648 // Return whether we want to pass flag NON_PIC_REF for this
2649 // reloc. This means the relocation type accesses a symbol not via
2652 reloc_is_non_pic(unsigned int r_type)
2656 // These relocation types reference GOT or PLT entries explicitly.
2657 case elfcpp::R_ARM_GOT_BREL:
2658 case elfcpp::R_ARM_GOT_ABS:
2659 case elfcpp::R_ARM_GOT_PREL:
2660 case elfcpp::R_ARM_GOT_BREL12:
2661 case elfcpp::R_ARM_PLT32_ABS:
2662 case elfcpp::R_ARM_TLS_GD32:
2663 case elfcpp::R_ARM_TLS_LDM32:
2664 case elfcpp::R_ARM_TLS_IE32:
2665 case elfcpp::R_ARM_TLS_IE12GP:
2667 // These relocate types may use PLT entries.
2668 case elfcpp::R_ARM_CALL:
2669 case elfcpp::R_ARM_THM_CALL:
2670 case elfcpp::R_ARM_JUMP24:
2671 case elfcpp::R_ARM_THM_JUMP24:
2672 case elfcpp::R_ARM_THM_JUMP19:
2673 case elfcpp::R_ARM_PLT32:
2674 case elfcpp::R_ARM_THM_XPC22:
2675 case elfcpp::R_ARM_PREL31:
2676 case elfcpp::R_ARM_SBREL31:
2685 // Do a TLS relocation.
2686 inline typename Arm_relocate_functions<big_endian>::Status
2687 relocate_tls(const Relocate_info<32, big_endian>*, Target_arm<big_endian>*,
2688 size_t, const elfcpp::Rel<32, big_endian>&, unsigned int,
2689 const Sized_symbol<32>*, const Symbol_value<32>*,
2690 unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
2695 // A class which returns the size required for a relocation type,
2696 // used while scanning relocs during a relocatable link.
2697 class Relocatable_size_for_reloc
2701 get_size_for_reloc(unsigned int, Relobj*);
2704 // Adjust TLS relocation type based on the options and whether this
2705 // is a local symbol.
2706 static tls::Tls_optimization
2707 optimize_tls_reloc(bool is_final, int r_type);
2709 // Get the GOT section, creating it if necessary.
2710 Arm_output_data_got<big_endian>*
2711 got_section(Symbol_table*, Layout*);
2713 // Get the GOT PLT section.
2715 got_plt_section() const
2717 gold_assert(this->got_plt_ != NULL);
2718 return this->got_plt_;
2721 // Create a PLT entry for a global symbol.
2723 make_plt_entry(Symbol_table*, Layout*, Symbol*);
2725 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
2727 define_tls_base_symbol(Symbol_table*, Layout*);
2729 // Create a GOT entry for the TLS module index.
2731 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2732 Sized_relobj_file<32, big_endian>* object);
2734 // Get the PLT section.
2735 const Output_data_plt_arm<big_endian>*
2738 gold_assert(this->plt_ != NULL);
2742 // Get the dynamic reloc section, creating it if necessary.
2744 rel_dyn_section(Layout*);
2746 // Get the section to use for TLS_DESC relocations.
2748 rel_tls_desc_section(Layout*) const;
2750 // Return true if the symbol may need a COPY relocation.
2751 // References from an executable object to non-function symbols
2752 // defined in a dynamic object may need a COPY relocation.
2754 may_need_copy_reloc(Symbol* gsym)
2756 return (gsym->type() != elfcpp::STT_ARM_TFUNC
2757 && gsym->may_need_copy_reloc());
2760 // Add a potential copy relocation.
2762 copy_reloc(Symbol_table* symtab, Layout* layout,
2763 Sized_relobj_file<32, big_endian>* object,
2764 unsigned int shndx, Output_section* output_section,
2765 Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc)
2767 this->copy_relocs_.copy_reloc(symtab, layout,
2768 symtab->get_sized_symbol<32>(sym),
2769 object, shndx, output_section, reloc,
2770 this->rel_dyn_section(layout));
2773 // Whether two EABI versions are compatible.
2775 are_eabi_versions_compatible(elfcpp::Elf_Word v1, elfcpp::Elf_Word v2);
2777 // Merge processor-specific flags from input object and those in the ELF
2778 // header of the output.
2780 merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word);
2782 // Get the secondary compatible architecture.
2784 get_secondary_compatible_arch(const Attributes_section_data*);
2786 // Set the secondary compatible architecture.
2788 set_secondary_compatible_arch(Attributes_section_data*, int);
2791 tag_cpu_arch_combine(const char*, int, int*, int, int);
2793 // Helper to print AEABI enum tag value.
2795 aeabi_enum_name(unsigned int);
2797 // Return string value for TAG_CPU_name.
2799 tag_cpu_name_value(unsigned int);
2801 // Query attributes object to see if integer divide instructions may be
2802 // present in an object.
2804 attributes_accept_div(int arch, int profile,
2805 const Object_attribute* div_attr);
2807 // Query attributes object to see if integer divide instructions are
2808 // forbidden to be in the object. This is not the inverse of
2809 // attributes_accept_div.
2811 attributes_forbid_div(const Object_attribute* div_attr);
2813 // Merge object attributes from input object and those in the output.
2815 merge_object_attributes(const char*, const Attributes_section_data*);
2817 // Helper to get an AEABI object attribute
2819 get_aeabi_object_attribute(int tag) const
2821 Attributes_section_data* pasd = this->attributes_section_data_;
2822 gold_assert(pasd != NULL);
2823 Object_attribute* attr =
2824 pasd->get_attribute(Object_attribute::OBJ_ATTR_PROC, tag);
2825 gold_assert(attr != NULL);
2830 // Methods to support stub-generations.
2833 // Group input sections for stub generation.
2835 group_sections(Layout*, section_size_type, bool, const Task*);
2837 // Scan a relocation for stub generation.
2839 scan_reloc_for_stub(const Relocate_info<32, big_endian>*, unsigned int,
2840 const Sized_symbol<32>*, unsigned int,
2841 const Symbol_value<32>*,
2842 elfcpp::Elf_types<32>::Elf_Swxword, Arm_address);
2844 // Scan a relocation section for stub.
2845 template<int sh_type>
2847 scan_reloc_section_for_stubs(
2848 const Relocate_info<32, big_endian>* relinfo,
2849 const unsigned char* prelocs,
2851 Output_section* output_section,
2852 bool needs_special_offset_handling,
2853 const unsigned char* view,
2854 elfcpp::Elf_types<32>::Elf_Addr view_address,
2857 // Fix .ARM.exidx section coverage.
2859 fix_exidx_coverage(Layout*, const Input_objects*,
2860 Arm_output_section<big_endian>*, Symbol_table*,
2863 // Functors for STL set.
2864 struct output_section_address_less_than
2867 operator()(const Output_section* s1, const Output_section* s2) const
2868 { return s1->address() < s2->address(); }
2871 // Information about this specific target which we pass to the
2872 // general Target structure.
2873 static const Target::Target_info arm_info;
2875 // The types of GOT entries needed for this platform.
2876 // These values are exposed to the ABI in an incremental link.
2877 // Do not renumber existing values without changing the version
2878 // number of the .gnu_incremental_inputs section.
2881 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
2882 GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset
2883 GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset
2884 GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair
2885 GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair
2888 typedef typename std::vector<Stub_table<big_endian>*> Stub_table_list;
2890 // Map input section to Arm_input_section.
2891 typedef Unordered_map<Section_id,
2892 Arm_input_section<big_endian>*,
2894 Arm_input_section_map;
2896 // Map output addresses to relocs for Cortex-A8 erratum.
2897 typedef Unordered_map<Arm_address, const Cortex_a8_reloc*>
2898 Cortex_a8_relocs_info;
2901 Arm_output_data_got<big_endian>* got_;
2903 Output_data_plt_arm<big_endian>* plt_;
2904 // The GOT PLT section.
2905 Output_data_space* got_plt_;
2906 // The dynamic reloc section.
2907 Reloc_section* rel_dyn_;
2908 // Relocs saved to avoid a COPY reloc.
2909 Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_;
2910 // Space for variables copied with a COPY reloc.
2911 Output_data_space* dynbss_;
2912 // Offset of the GOT entry for the TLS module index.
2913 unsigned int got_mod_index_offset_;
2914 // True if the _TLS_MODULE_BASE_ symbol has been defined.
2915 bool tls_base_symbol_defined_;
2916 // Vector of Stub_tables created.
2917 Stub_table_list stub_tables_;
2919 const Stub_factory &stub_factory_;
2920 // Whether we force PIC branch veneers.
2921 bool should_force_pic_veneer_;
2922 // Map for locating Arm_input_sections.
2923 Arm_input_section_map arm_input_section_map_;
2924 // Attributes section data in output.
2925 Attributes_section_data* attributes_section_data_;
2926 // Whether we want to fix code for Cortex-A8 erratum.
2927 bool fix_cortex_a8_;
2928 // Map addresses to relocs for Cortex-A8 erratum.
2929 Cortex_a8_relocs_info cortex_a8_relocs_info_;
2932 template<bool big_endian>
2933 const Target::Target_info Target_arm<big_endian>::arm_info =
2936 big_endian, // is_big_endian
2937 elfcpp::EM_ARM, // machine_code
2938 false, // has_make_symbol
2939 false, // has_resolve
2940 false, // has_code_fill
2941 true, // is_default_stack_executable
2942 false, // can_icf_inline_merge_sections
2944 "/usr/lib/libc.so.1", // dynamic_linker
2945 0x8000, // default_text_segment_address
2946 0x1000, // abi_pagesize (overridable by -z max-page-size)
2947 0x1000, // common_pagesize (overridable by -z common-page-size)
2948 false, // isolate_execinstr
2950 elfcpp::SHN_UNDEF, // small_common_shndx
2951 elfcpp::SHN_UNDEF, // large_common_shndx
2952 0, // small_common_section_flags
2953 0, // large_common_section_flags
2954 ".ARM.attributes", // attributes_section
2955 "aeabi", // attributes_vendor
2956 "_start" // entry_symbol_name
2959 // Arm relocate functions class
2962 template<bool big_endian>
2963 class Arm_relocate_functions : public Relocate_functions<32, big_endian>
2968 STATUS_OKAY, // No error during relocation.
2969 STATUS_OVERFLOW, // Relocation overflow.
2970 STATUS_BAD_RELOC // Relocation cannot be applied.
2974 typedef Relocate_functions<32, big_endian> Base;
2975 typedef Arm_relocate_functions<big_endian> This;
2977 // Encoding of imm16 argument for movt and movw ARM instructions
2980 // imm16 := imm4 | imm12
2982 // f e d c b a 9 8 7 6 5 4 3 2 1 0 f e d c b a 9 8 7 6 5 4 3 2 1 0
2983 // +-------+---------------+-------+-------+-----------------------+
2984 // | | |imm4 | |imm12 |
2985 // +-------+---------------+-------+-------+-----------------------+
2987 // Extract the relocation addend from VAL based on the ARM
2988 // instruction encoding described above.
2989 static inline typename elfcpp::Swap<32, big_endian>::Valtype
2990 extract_arm_movw_movt_addend(
2991 typename elfcpp::Swap<32, big_endian>::Valtype val)
2993 // According to the Elf ABI for ARM Architecture the immediate
2994 // field is sign-extended to form the addend.
2995 return Bits<16>::sign_extend32(((val >> 4) & 0xf000) | (val & 0xfff));
2998 // Insert X into VAL based on the ARM instruction encoding described
3000 static inline typename elfcpp::Swap<32, big_endian>::Valtype
3001 insert_val_arm_movw_movt(
3002 typename elfcpp::Swap<32, big_endian>::Valtype val,
3003 typename elfcpp::Swap<32, big_endian>::Valtype x)
3007 val |= (x & 0xf000) << 4;
3011 // Encoding of imm16 argument for movt and movw Thumb2 instructions
3014 // imm16 := imm4 | i | imm3 | imm8
3016 // f e d c b a 9 8 7 6 5 4 3 2 1 0 f e d c b a 9 8 7 6 5 4 3 2 1 0
3017 // +---------+-+-----------+-------++-+-----+-------+---------------+
3018 // | |i| |imm4 || |imm3 | |imm8 |
3019 // +---------+-+-----------+-------++-+-----+-------+---------------+
3021 // Extract the relocation addend from VAL based on the Thumb2
3022 // instruction encoding described above.
3023 static inline typename elfcpp::Swap<32, big_endian>::Valtype
3024 extract_thumb_movw_movt_addend(
3025 typename elfcpp::Swap<32, big_endian>::Valtype val)
3027 // According to the Elf ABI for ARM Architecture the immediate
3028 // field is sign-extended to form the addend.
3029 return Bits<16>::sign_extend32(((val >> 4) & 0xf000)
3030 | ((val >> 15) & 0x0800)
3031 | ((val >> 4) & 0x0700)
3035 // Insert X into VAL based on the Thumb2 instruction encoding
3037 static inline typename elfcpp::Swap<32, big_endian>::Valtype
3038 insert_val_thumb_movw_movt(
3039 typename elfcpp::Swap<32, big_endian>::Valtype val,
3040 typename elfcpp::Swap<32, big_endian>::Valtype x)
3043 val |= (x & 0xf000) << 4;
3044 val |= (x & 0x0800) << 15;
3045 val |= (x & 0x0700) << 4;
3046 val |= (x & 0x00ff);
3050 // Calculate the smallest constant Kn for the specified residual.
3051 // (see (AAELF 4.6.1.4 Static ARM relocations, Group Relocations, p.32)
3053 calc_grp_kn(typename elfcpp::Swap<32, big_endian>::Valtype residual)
3059 // Determine the most significant bit in the residual and
3060 // align the resulting value to a 2-bit boundary.
3061 for (msb = 30; (msb >= 0) && !(residual & (3 << msb)); msb -= 2)
3063 // The desired shift is now (msb - 6), or zero, whichever
3065 return (((msb - 6) < 0) ? 0 : (msb - 6));
3068 // Calculate the final residual for the specified group index.
3069 // If the passed group index is less than zero, the method will return
3070 // the value of the specified residual without any change.
3071 // (see (AAELF 4.6.1.4 Static ARM relocations, Group Relocations, p.32)
3072 static typename elfcpp::Swap<32, big_endian>::Valtype
3073 calc_grp_residual(typename elfcpp::Swap<32, big_endian>::Valtype residual,
3076 for (int n = 0; n <= group; n++)
3078 // Calculate which part of the value to mask.
3079 uint32_t shift = calc_grp_kn(residual);
3080 // Calculate the residual for the next time around.
3081 residual &= ~(residual & (0xff << shift));
3087 // Calculate the value of Gn for the specified group index.
3088 // We return it in the form of an encoded constant-and-rotation.
3089 // (see (AAELF 4.6.1.4 Static ARM relocations, Group Relocations, p.32)
3090 static typename elfcpp::Swap<32, big_endian>::Valtype
3091 calc_grp_gn(typename elfcpp::Swap<32, big_endian>::Valtype residual,
3094 typename elfcpp::Swap<32, big_endian>::Valtype gn = 0;
3097 for (int n = 0; n <= group; n++)
3099 // Calculate which part of the value to mask.
3100 shift = calc_grp_kn(residual);
3101 // Calculate Gn in 32-bit as well as encoded constant-and-rotation form.
3102 gn = residual & (0xff << shift);
3103 // Calculate the residual for the next time around.
3106 // Return Gn in the form of an encoded constant-and-rotation.
3107 return ((gn >> shift) | ((gn <= 0xff ? 0 : (32 - shift) / 2) << 8));
3111 // Handle ARM long branches.
3112 static typename This::Status
3113 arm_branch_common(unsigned int, const Relocate_info<32, big_endian>*,
3114 unsigned char*, const Sized_symbol<32>*,
3115 const Arm_relobj<big_endian>*, unsigned int,
3116 const Symbol_value<32>*, Arm_address, Arm_address, bool);
3118 // Handle THUMB long branches.
3119 static typename This::Status
3120 thumb_branch_common(unsigned int, const Relocate_info<32, big_endian>*,
3121 unsigned char*, const Sized_symbol<32>*,
3122 const Arm_relobj<big_endian>*, unsigned int,
3123 const Symbol_value<32>*, Arm_address, Arm_address, bool);
3126 // Return the branch offset of a 32-bit THUMB branch.
3127 static inline int32_t
3128 thumb32_branch_offset(uint16_t upper_insn, uint16_t lower_insn)
3130 // We use the Thumb-2 encoding (backwards compatible with Thumb-1)
3131 // involving the J1 and J2 bits.
3132 uint32_t s = (upper_insn & (1U << 10)) >> 10;
3133 uint32_t upper = upper_insn & 0x3ffU;
3134 uint32_t lower = lower_insn & 0x7ffU;
3135 uint32_t j1 = (lower_insn & (1U << 13)) >> 13;
3136 uint32_t j2 = (lower_insn & (1U << 11)) >> 11;
3137 uint32_t i1 = j1 ^ s ? 0 : 1;
3138 uint32_t i2 = j2 ^ s ? 0 : 1;
3140 return Bits<25>::sign_extend32((s << 24) | (i1 << 23) | (i2 << 22)
3141 | (upper << 12) | (lower << 1));
3144 // Insert OFFSET to a 32-bit THUMB branch and return the upper instruction.
3145 // UPPER_INSN is the original upper instruction of the branch. Caller is
3146 // responsible for overflow checking and BLX offset adjustment.
3147 static inline uint16_t
3148 thumb32_branch_upper(uint16_t upper_insn, int32_t offset)
3150 uint32_t s = offset < 0 ? 1 : 0;
3151 uint32_t bits = static_cast<uint32_t>(offset);
3152 return (upper_insn & ~0x7ffU) | ((bits >> 12) & 0x3ffU) | (s << 10);
3155 // Insert OFFSET to a 32-bit THUMB branch and return the lower instruction.
3156 // LOWER_INSN is the original lower instruction of the branch. Caller is
3157 // responsible for overflow checking and BLX offset adjustment.
3158 static inline uint16_t
3159 thumb32_branch_lower(uint16_t lower_insn, int32_t offset)
3161 uint32_t s = offset < 0 ? 1 : 0;
3162 uint32_t bits = static_cast<uint32_t>(offset);
3163 return ((lower_insn & ~0x2fffU)
3164 | ((((bits >> 23) & 1) ^ !s) << 13)
3165 | ((((bits >> 22) & 1) ^ !s) << 11)
3166 | ((bits >> 1) & 0x7ffU));
3169 // Return the branch offset of a 32-bit THUMB conditional branch.
3170 static inline int32_t
3171 thumb32_cond_branch_offset(uint16_t upper_insn, uint16_t lower_insn)
3173 uint32_t s = (upper_insn & 0x0400U) >> 10;
3174 uint32_t j1 = (lower_insn & 0x2000U) >> 13;
3175 uint32_t j2 = (lower_insn & 0x0800U) >> 11;
3176 uint32_t lower = (lower_insn & 0x07ffU);
3177 uint32_t upper = (s << 8) | (j2 << 7) | (j1 << 6) | (upper_insn & 0x003fU);
3179 return Bits<21>::sign_extend32((upper << 12) | (lower << 1));
3182 // Insert OFFSET to a 32-bit THUMB conditional branch and return the upper
3183 // instruction. UPPER_INSN is the original upper instruction of the branch.
3184 // Caller is responsible for overflow checking.
3185 static inline uint16_t
3186 thumb32_cond_branch_upper(uint16_t upper_insn, int32_t offset)
3188 uint32_t s = offset < 0 ? 1 : 0;
3189 uint32_t bits = static_cast<uint32_t>(offset);
3190 return (upper_insn & 0xfbc0U) | (s << 10) | ((bits & 0x0003f000U) >> 12);
3193 // Insert OFFSET to a 32-bit THUMB conditional branch and return the lower
3194 // instruction. LOWER_INSN is the original lower instruction of the branch.
3195 // The caller is responsible for overflow checking.
3196 static inline uint16_t
3197 thumb32_cond_branch_lower(uint16_t lower_insn, int32_t offset)
3199 uint32_t bits = static_cast<uint32_t>(offset);
3200 uint32_t j2 = (bits & 0x00080000U) >> 19;
3201 uint32_t j1 = (bits & 0x00040000U) >> 18;
3202 uint32_t lo = (bits & 0x00000ffeU) >> 1;
3204 return (lower_insn & 0xd000U) | (j1 << 13) | (j2 << 11) | lo;
3207 // R_ARM_ABS8: S + A
3208 static inline typename This::Status
3209 abs8(unsigned char* view,
3210 const Sized_relobj_file<32, big_endian>* object,
3211 const Symbol_value<32>* psymval)
3213 typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype;
3214 Valtype* wv = reinterpret_cast<Valtype*>(view);
3215 Valtype val = elfcpp::Swap<8, big_endian>::readval(wv);
3216 int32_t addend = Bits<8>::sign_extend32(val);
3217 Arm_address x = psymval->value(object, addend);
3218 val = Bits<32>::bit_select32(val, x, 0xffU);
3219 elfcpp::Swap<8, big_endian>::writeval(wv, val);
3221 // R_ARM_ABS8 permits signed or unsigned results.
3222 return (Bits<8>::has_signed_unsigned_overflow32(x)
3223 ? This::STATUS_OVERFLOW
3224 : This::STATUS_OKAY);
3227 // R_ARM_THM_ABS5: S + A
3228 static inline typename This::Status
3229 thm_abs5(unsigned char* view,
3230 const Sized_relobj_file<32, big_endian>* object,
3231 const Symbol_value<32>* psymval)
3233 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3234 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3235 Valtype* wv = reinterpret_cast<Valtype*>(view);
3236 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3237 Reltype addend = (val & 0x7e0U) >> 6;
3238 Reltype x = psymval->value(object, addend);
3239 val = Bits<32>::bit_select32(val, x << 6, 0x7e0U);
3240 elfcpp::Swap<16, big_endian>::writeval(wv, val);
3241 return (Bits<5>::has_overflow32(x)
3242 ? This::STATUS_OVERFLOW
3243 : This::STATUS_OKAY);
3246 // R_ARM_ABS12: S + A
3247 static inline typename This::Status
3248 abs12(unsigned char* view,
3249 const Sized_relobj_file<32, big_endian>* object,
3250 const Symbol_value<32>* psymval)
3252 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3253 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3254 Valtype* wv = reinterpret_cast<Valtype*>(view);
3255 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3256 Reltype addend = val & 0x0fffU;
3257 Reltype x = psymval->value(object, addend);
3258 val = Bits<32>::bit_select32(val, x, 0x0fffU);
3259 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3260 return (Bits<12>::has_overflow32(x)
3261 ? This::STATUS_OVERFLOW
3262 : This::STATUS_OKAY);
3265 // R_ARM_ABS16: S + A
3266 static inline typename This::Status
3267 abs16(unsigned char* view,
3268 const Sized_relobj_file<32, big_endian>* object,
3269 const Symbol_value<32>* psymval)
3271 typedef typename elfcpp::Swap_unaligned<16, big_endian>::Valtype Valtype;
3272 Valtype val = elfcpp::Swap_unaligned<16, big_endian>::readval(view);
3273 int32_t addend = Bits<16>::sign_extend32(val);
3274 Arm_address x = psymval->value(object, addend);
3275 val = Bits<32>::bit_select32(val, x, 0xffffU);
3276 elfcpp::Swap_unaligned<16, big_endian>::writeval(view, val);
3278 // R_ARM_ABS16 permits signed or unsigned results.
3279 return (Bits<16>::has_signed_unsigned_overflow32(x)
3280 ? This::STATUS_OVERFLOW
3281 : This::STATUS_OKAY);
3284 // R_ARM_ABS32: (S + A) | T
3285 static inline typename This::Status
3286 abs32(unsigned char* view,
3287 const Sized_relobj_file<32, big_endian>* object,
3288 const Symbol_value<32>* psymval,
3289 Arm_address thumb_bit)
3291 typedef typename elfcpp::Swap_unaligned<32, big_endian>::Valtype Valtype;
3292 Valtype addend = elfcpp::Swap_unaligned<32, big_endian>::readval(view);
3293 Valtype x = psymval->value(object, addend) | thumb_bit;
3294 elfcpp::Swap_unaligned<32, big_endian>::writeval(view, x);
3295 return This::STATUS_OKAY;
3298 // R_ARM_REL32: (S + A) | T - P
3299 static inline typename This::Status
3300 rel32(unsigned char* view,
3301 const Sized_relobj_file<32, big_endian>* object,
3302 const Symbol_value<32>* psymval,
3303 Arm_address address,
3304 Arm_address thumb_bit)
3306 typedef typename elfcpp::Swap_unaligned<32, big_endian>::Valtype Valtype;
3307 Valtype addend = elfcpp::Swap_unaligned<32, big_endian>::readval(view);
3308 Valtype x = (psymval->value(object, addend) | thumb_bit) - address;
3309 elfcpp::Swap_unaligned<32, big_endian>::writeval(view, x);
3310 return This::STATUS_OKAY;
3313 // R_ARM_THM_JUMP24: (S + A) | T - P
3314 static typename This::Status
3315 thm_jump19(unsigned char* view, const Arm_relobj<big_endian>* object,
3316 const Symbol_value<32>* psymval, Arm_address address,
3317 Arm_address thumb_bit);
3319 // R_ARM_THM_JUMP6: S + A – P
3320 static inline typename This::Status
3321 thm_jump6(unsigned char* view,
3322 const Sized_relobj_file<32, big_endian>* object,
3323 const Symbol_value<32>* psymval,
3324 Arm_address address)
3326 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3327 typedef typename elfcpp::Swap<16, big_endian>::Valtype Reltype;
3328 Valtype* wv = reinterpret_cast<Valtype*>(view);
3329 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3330 // bit[9]:bit[7:3]:’0’ (mask: 0x02f8)
3331 Reltype addend = (((val & 0x0200) >> 3) | ((val & 0x00f8) >> 2));
3332 Reltype x = (psymval->value(object, addend) - address);
3333 val = (val & 0xfd07) | ((x & 0x0040) << 3) | ((val & 0x003e) << 2);
3334 elfcpp::Swap<16, big_endian>::writeval(wv, val);
3335 // CZB does only forward jumps.
3336 return ((x > 0x007e)
3337 ? This::STATUS_OVERFLOW
3338 : This::STATUS_OKAY);
3341 // R_ARM_THM_JUMP8: S + A – P
3342 static inline typename This::Status
3343 thm_jump8(unsigned char* view,
3344 const Sized_relobj_file<32, big_endian>* object,
3345 const Symbol_value<32>* psymval,
3346 Arm_address address)
3348 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3349 Valtype* wv = reinterpret_cast<Valtype*>(view);
3350 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3351 int32_t addend = Bits<8>::sign_extend32((val & 0x00ff) << 1);
3352 int32_t x = (psymval->value(object, addend) - address);
3353 elfcpp::Swap<16, big_endian>::writeval(wv, ((val & 0xff00)
3354 | ((x & 0x01fe) >> 1)));
3355 // We do a 9-bit overflow check because x is right-shifted by 1 bit.
3356 return (Bits<9>::has_overflow32(x)
3357 ? This::STATUS_OVERFLOW
3358 : This::STATUS_OKAY);
3361 // R_ARM_THM_JUMP11: S + A – P
3362 static inline typename This::Status
3363 thm_jump11(unsigned char* view,
3364 const Sized_relobj_file<32, big_endian>* object,
3365 const Symbol_value<32>* psymval,
3366 Arm_address address)
3368 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3369 Valtype* wv = reinterpret_cast<Valtype*>(view);
3370 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3371 int32_t addend = Bits<11>::sign_extend32((val & 0x07ff) << 1);
3372 int32_t x = (psymval->value(object, addend) - address);
3373 elfcpp::Swap<16, big_endian>::writeval(wv, ((val & 0xf800)
3374 | ((x & 0x0ffe) >> 1)));
3375 // We do a 12-bit overflow check because x is right-shifted by 1 bit.
3376 return (Bits<12>::has_overflow32(x)
3377 ? This::STATUS_OVERFLOW
3378 : This::STATUS_OKAY);
3381 // R_ARM_BASE_PREL: B(S) + A - P
3382 static inline typename This::Status
3383 base_prel(unsigned char* view,
3385 Arm_address address)
3387 Base::rel32(view, origin - address);
3391 // R_ARM_BASE_ABS: B(S) + A
3392 static inline typename This::Status
3393 base_abs(unsigned char* view,
3396 Base::rel32(view, origin);
3400 // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG
3401 static inline typename This::Status
3402 got_brel(unsigned char* view,
3403 typename elfcpp::Swap<32, big_endian>::Valtype got_offset)
3405 Base::rel32(view, got_offset);
3406 return This::STATUS_OKAY;
3409 // R_ARM_GOT_PREL: GOT(S) + A - P
3410 static inline typename This::Status
3411 got_prel(unsigned char* view,
3412 Arm_address got_entry,
3413 Arm_address address)
3415 Base::rel32(view, got_entry - address);
3416 return This::STATUS_OKAY;
3419 // R_ARM_PREL: (S + A) | T - P
3420 static inline typename This::Status
3421 prel31(unsigned char* view,
3422 const Sized_relobj_file<32, big_endian>* object,
3423 const Symbol_value<32>* psymval,
3424 Arm_address address,
3425 Arm_address thumb_bit)
3427 typedef typename elfcpp::Swap_unaligned<32, big_endian>::Valtype Valtype;
3428 Valtype val = elfcpp::Swap_unaligned<32, big_endian>::readval(view);
3429 Valtype addend = Bits<31>::sign_extend32(val);
3430 Valtype x = (psymval->value(object, addend) | thumb_bit) - address;
3431 val = Bits<32>::bit_select32(val, x, 0x7fffffffU);
3432 elfcpp::Swap_unaligned<32, big_endian>::writeval(view, val);
3433 return (Bits<31>::has_overflow32(x)
3434 ? This::STATUS_OVERFLOW
3435 : This::STATUS_OKAY);
3438 // R_ARM_MOVW_ABS_NC: (S + A) | T (relative address base is )
3439 // R_ARM_MOVW_PREL_NC: (S + A) | T - P
3440 // R_ARM_MOVW_BREL_NC: ((S + A) | T) - B(S)
3441 // R_ARM_MOVW_BREL: ((S + A) | T) - B(S)
3442 static inline typename This::Status
3443 movw(unsigned char* view,
3444 const Sized_relobj_file<32, big_endian>* object,
3445 const Symbol_value<32>* psymval,
3446 Arm_address relative_address_base,
3447 Arm_address thumb_bit,
3448 bool check_overflow)
3450 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3451 Valtype* wv = reinterpret_cast<Valtype*>(view);
3452 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3453 Valtype addend = This::extract_arm_movw_movt_addend(val);
3454 Valtype x = ((psymval->value(object, addend) | thumb_bit)
3455 - relative_address_base);
3456 val = This::insert_val_arm_movw_movt(val, x);
3457 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3458 return ((check_overflow && Bits<16>::has_overflow32(x))
3459 ? This::STATUS_OVERFLOW
3460 : This::STATUS_OKAY);
3463 // R_ARM_MOVT_ABS: S + A (relative address base is 0)
3464 // R_ARM_MOVT_PREL: S + A - P
3465 // R_ARM_MOVT_BREL: S + A - B(S)
3466 static inline typename This::Status
3467 movt(unsigned char* view,
3468 const Sized_relobj_file<32, big_endian>* object,
3469 const Symbol_value<32>* psymval,
3470 Arm_address relative_address_base)
3472 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3473 Valtype* wv = reinterpret_cast<Valtype*>(view);
3474 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3475 Valtype addend = This::extract_arm_movw_movt_addend(val);
3476 Valtype x = (psymval->value(object, addend) - relative_address_base) >> 16;
3477 val = This::insert_val_arm_movw_movt(val, x);
3478 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3479 // FIXME: IHI0044D says that we should check for overflow.
3480 return This::STATUS_OKAY;
3483 // R_ARM_THM_MOVW_ABS_NC: S + A | T (relative_address_base is 0)
3484 // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P
3485 // R_ARM_THM_MOVW_BREL_NC: ((S + A) | T) - B(S)
3486 // R_ARM_THM_MOVW_BREL: ((S + A) | T) - B(S)
3487 static inline typename This::Status
3488 thm_movw(unsigned char* view,
3489 const Sized_relobj_file<32, big_endian>* object,
3490 const Symbol_value<32>* psymval,
3491 Arm_address relative_address_base,
3492 Arm_address thumb_bit,
3493 bool check_overflow)
3495 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3496 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3497 Valtype* wv = reinterpret_cast<Valtype*>(view);
3498 Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3499 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3500 Reltype addend = This::extract_thumb_movw_movt_addend(val);
3502 (psymval->value(object, addend) | thumb_bit) - relative_address_base;
3503 val = This::insert_val_thumb_movw_movt(val, x);
3504 elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16);
3505 elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff);
3506 return ((check_overflow && Bits<16>::has_overflow32(x))
3507 ? This::STATUS_OVERFLOW
3508 : This::STATUS_OKAY);
3511 // R_ARM_THM_MOVT_ABS: S + A (relative address base is 0)
3512 // R_ARM_THM_MOVT_PREL: S + A - P
3513 // R_ARM_THM_MOVT_BREL: S + A - B(S)
3514 static inline typename This::Status
3515 thm_movt(unsigned char* view,
3516 const Sized_relobj_file<32, big_endian>* object,
3517 const Symbol_value<32>* psymval,
3518 Arm_address relative_address_base)
3520 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3521 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3522 Valtype* wv = reinterpret_cast<Valtype*>(view);
3523 Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3524 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3525 Reltype addend = This::extract_thumb_movw_movt_addend(val);
3526 Reltype x = (psymval->value(object, addend) - relative_address_base) >> 16;
3527 val = This::insert_val_thumb_movw_movt(val, x);
3528 elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16);
3529 elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff);
3530 return This::STATUS_OKAY;
3533 // R_ARM_THM_ALU_PREL_11_0: ((S + A) | T) - Pa (Thumb32)
3534 static inline typename This::Status
3535 thm_alu11(unsigned char* view,
3536 const Sized_relobj_file<32, big_endian>* object,
3537 const Symbol_value<32>* psymval,
3538 Arm_address address,
3539 Arm_address thumb_bit)
3541 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3542 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3543 Valtype* wv = reinterpret_cast<Valtype*>(view);
3544 Reltype insn = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3545 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3547 // f e d c b|a|9|8 7 6 5|4|3 2 1 0||f|e d c|b a 9 8|7 6 5 4 3 2 1 0
3548 // -----------------------------------------------------------------------
3549 // ADD{S} 1 1 1 1 0|i|0|1 0 0 0|S|1 1 0 1||0|imm3 |Rd |imm8
3550 // ADDW 1 1 1 1 0|i|1|0 0 0 0|0|1 1 0 1||0|imm3 |Rd |imm8
3551 // ADR[+] 1 1 1 1 0|i|1|0 0 0 0|0|1 1 1 1||0|imm3 |Rd |imm8
3552 // SUB{S} 1 1 1 1 0|i|0|1 1 0 1|S|1 1 0 1||0|imm3 |Rd |imm8
3553 // SUBW 1 1 1 1 0|i|1|0 1 0 1|0|1 1 0 1||0|imm3 |Rd |imm8
3554 // ADR[-] 1 1 1 1 0|i|1|0 1 0 1|0|1 1 1 1||0|imm3 |Rd |imm8
3556 // Determine a sign for the addend.
3557 const int sign = ((insn & 0xf8ef0000) == 0xf0ad0000
3558 || (insn & 0xf8ef0000) == 0xf0af0000) ? -1 : 1;
3559 // Thumb2 addend encoding:
3560 // imm12 := i | imm3 | imm8
3561 int32_t addend = (insn & 0xff)
3562 | ((insn & 0x00007000) >> 4)
3563 | ((insn & 0x04000000) >> 15);
3564 // Apply a sign to the added.
3567 int32_t x = (psymval->value(object, addend) | thumb_bit)
3568 - (address & 0xfffffffc);
3569 Reltype val = abs(x);
3570 // Mask out the value and a distinct part of the ADD/SUB opcode
3571 // (bits 7:5 of opword).
3572 insn = (insn & 0xfb0f8f00)
3574 | ((val & 0x700) << 4)
3575 | ((val & 0x800) << 15);
3576 // Set the opcode according to whether the value to go in the
3577 // place is negative.
3581 elfcpp::Swap<16, big_endian>::writeval(wv, insn >> 16);
3582 elfcpp::Swap<16, big_endian>::writeval(wv + 1, insn & 0xffff);
3583 return ((val > 0xfff) ?
3584 This::STATUS_OVERFLOW : This::STATUS_OKAY);
3587 // R_ARM_THM_PC8: S + A - Pa (Thumb)
3588 static inline typename This::Status
3589 thm_pc8(unsigned char* view,
3590 const Sized_relobj_file<32, big_endian>* object,
3591 const Symbol_value<32>* psymval,
3592 Arm_address address)
3594 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3595 typedef typename elfcpp::Swap<16, big_endian>::Valtype Reltype;
3596 Valtype* wv = reinterpret_cast<Valtype*>(view);
3597 Valtype insn = elfcpp::Swap<16, big_endian>::readval(wv);
3598 Reltype addend = ((insn & 0x00ff) << 2);
3599 int32_t x = (psymval->value(object, addend) - (address & 0xfffffffc));
3600 Reltype val = abs(x);
3601 insn = (insn & 0xff00) | ((val & 0x03fc) >> 2);
3603 elfcpp::Swap<16, big_endian>::writeval(wv, insn);
3604 return ((val > 0x03fc)
3605 ? This::STATUS_OVERFLOW
3606 : This::STATUS_OKAY);
3609 // R_ARM_THM_PC12: S + A - Pa (Thumb32)
3610 static inline typename This::Status
3611 thm_pc12(unsigned char* view,
3612 const Sized_relobj_file<32, big_endian>* object,
3613 const Symbol_value<32>* psymval,
3614 Arm_address address)
3616 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3617 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3618 Valtype* wv = reinterpret_cast<Valtype*>(view);
3619 Reltype insn = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3620 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3621 // Determine a sign for the addend (positive if the U bit is 1).
3622 const int sign = (insn & 0x00800000) ? 1 : -1;
3623 int32_t addend = (insn & 0xfff);
3624 // Apply a sign to the added.
3627 int32_t x = (psymval->value(object, addend) - (address & 0xfffffffc));
3628 Reltype val = abs(x);
3629 // Mask out and apply the value and the U bit.
3630 insn = (insn & 0xff7ff000) | (val & 0xfff);
3631 // Set the U bit according to whether the value to go in the
3632 // place is positive.
3636 elfcpp::Swap<16, big_endian>::writeval(wv, insn >> 16);
3637 elfcpp::Swap<16, big_endian>::writeval(wv + 1, insn & 0xffff);
3638 return ((val > 0xfff) ?
3639 This::STATUS_OVERFLOW : This::STATUS_OKAY);
3643 static inline typename This::Status
3644 v4bx(const Relocate_info<32, big_endian>* relinfo,
3645 unsigned char* view,
3646 const Arm_relobj<big_endian>* object,
3647 const Arm_address address,
3648 const bool is_interworking)
3651 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3652 Valtype* wv = reinterpret_cast<Valtype*>(view);
3653 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3655 // Ensure that we have a BX instruction.
3656 gold_assert((val & 0x0ffffff0) == 0x012fff10);
3657 const uint32_t reg = (val & 0xf);
3658 if (is_interworking && reg != 0xf)
3660 Stub_table<big_endian>* stub_table =
3661 object->stub_table(relinfo->data_shndx);
3662 gold_assert(stub_table != NULL);
3664 Arm_v4bx_stub* stub = stub_table->find_arm_v4bx_stub(reg);
3665 gold_assert(stub != NULL);
3667 int32_t veneer_address =
3668 stub_table->address() + stub->offset() - 8 - address;
3669 gold_assert((veneer_address <= ARM_MAX_FWD_BRANCH_OFFSET)
3670 && (veneer_address >= ARM_MAX_BWD_BRANCH_OFFSET));
3671 // Replace with a branch to veneer (B <addr>)
3672 val = (val & 0xf0000000) | 0x0a000000
3673 | ((veneer_address >> 2) & 0x00ffffff);
3677 // Preserve Rm (lowest four bits) and the condition code
3678 // (highest four bits). Other bits encode MOV PC,Rm.
3679 val = (val & 0xf000000f) | 0x01a0f000;
3681 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3682 return This::STATUS_OKAY;
3685 // R_ARM_ALU_PC_G0_NC: ((S + A) | T) - P
3686 // R_ARM_ALU_PC_G0: ((S + A) | T) - P
3687 // R_ARM_ALU_PC_G1_NC: ((S + A) | T) - P
3688 // R_ARM_ALU_PC_G1: ((S + A) | T) - P
3689 // R_ARM_ALU_PC_G2: ((S + A) | T) - P
3690 // R_ARM_ALU_SB_G0_NC: ((S + A) | T) - B(S)
3691 // R_ARM_ALU_SB_G0: ((S + A) | T) - B(S)
3692 // R_ARM_ALU_SB_G1_NC: ((S + A) | T) - B(S)
3693 // R_ARM_ALU_SB_G1: ((S + A) | T) - B(S)
3694 // R_ARM_ALU_SB_G2: ((S + A) | T) - B(S)
3695 static inline typename This::Status
3696 arm_grp_alu(unsigned char* view,
3697 const Sized_relobj_file<32, big_endian>* object,
3698 const Symbol_value<32>* psymval,
3700 Arm_address address,
3701 Arm_address thumb_bit,
3702 bool check_overflow)
3704 gold_assert(group >= 0 && group < 3);
3705 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3706 Valtype* wv = reinterpret_cast<Valtype*>(view);
3707 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3709 // ALU group relocations are allowed only for the ADD/SUB instructions.
3710 // (0x00800000 - ADD, 0x00400000 - SUB)
3711 const Valtype opcode = insn & 0x01e00000;
3712 if (opcode != 0x00800000 && opcode != 0x00400000)
3713 return This::STATUS_BAD_RELOC;
3715 // Determine a sign for the addend.
3716 const int sign = (opcode == 0x00800000) ? 1 : -1;
3717 // shifter = rotate_imm * 2
3718 const uint32_t shifter = (insn & 0xf00) >> 7;
3719 // Initial addend value.
3720 int32_t addend = insn & 0xff;
3721 // Rotate addend right by shifter.
3722 addend = (addend >> shifter) | (addend << (32 - shifter));
3723 // Apply a sign to the added.
3726 int32_t x = ((psymval->value(object, addend) | thumb_bit) - address);
3727 Valtype gn = Arm_relocate_functions::calc_grp_gn(abs(x), group);
3728 // Check for overflow if required
3730 && (Arm_relocate_functions::calc_grp_residual(abs(x), group) != 0))
3731 return This::STATUS_OVERFLOW;
3733 // Mask out the value and the ADD/SUB part of the opcode; take care
3734 // not to destroy the S bit.
3736 // Set the opcode according to whether the value to go in the
3737 // place is negative.
3738 insn |= ((x < 0) ? 0x00400000 : 0x00800000);
3739 // Encode the offset (encoded Gn).
3742 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3743 return This::STATUS_OKAY;
3746 // R_ARM_LDR_PC_G0: S + A - P
3747 // R_ARM_LDR_PC_G1: S + A - P
3748 // R_ARM_LDR_PC_G2: S + A - P
3749 // R_ARM_LDR_SB_G0: S + A - B(S)
3750 // R_ARM_LDR_SB_G1: S + A - B(S)
3751 // R_ARM_LDR_SB_G2: S + A - B(S)
3752 static inline typename This::Status
3753 arm_grp_ldr(unsigned char* view,
3754 const Sized_relobj_file<32, big_endian>* object,
3755 const Symbol_value<32>* psymval,
3757 Arm_address address)
3759 gold_assert(group >= 0 && group < 3);
3760 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3761 Valtype* wv = reinterpret_cast<Valtype*>(view);
3762 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3764 const int sign = (insn & 0x00800000) ? 1 : -1;
3765 int32_t addend = (insn & 0xfff) * sign;
3766 int32_t x = (psymval->value(object, addend) - address);
3767 // Calculate the relevant G(n-1) value to obtain this stage residual.
3769 Arm_relocate_functions::calc_grp_residual(abs(x), group - 1);
3770 if (residual >= 0x1000)
3771 return This::STATUS_OVERFLOW;
3773 // Mask out the value and U bit.
3775 // Set the U bit for non-negative values.
3780 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3781 return This::STATUS_OKAY;
3784 // R_ARM_LDRS_PC_G0: S + A - P
3785 // R_ARM_LDRS_PC_G1: S + A - P
3786 // R_ARM_LDRS_PC_G2: S + A - P
3787 // R_ARM_LDRS_SB_G0: S + A - B(S)
3788 // R_ARM_LDRS_SB_G1: S + A - B(S)
3789 // R_ARM_LDRS_SB_G2: S + A - B(S)
3790 static inline typename This::Status
3791 arm_grp_ldrs(unsigned char* view,
3792 const Sized_relobj_file<32, big_endian>* object,
3793 const Symbol_value<32>* psymval,
3795 Arm_address address)
3797 gold_assert(group >= 0 && group < 3);
3798 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3799 Valtype* wv = reinterpret_cast<Valtype*>(view);
3800 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3802 const int sign = (insn & 0x00800000) ? 1 : -1;
3803 int32_t addend = (((insn & 0xf00) >> 4) + (insn & 0xf)) * sign;
3804 int32_t x = (psymval->value(object, addend) - address);
3805 // Calculate the relevant G(n-1) value to obtain this stage residual.
3807 Arm_relocate_functions::calc_grp_residual(abs(x), group - 1);
3808 if (residual >= 0x100)
3809 return This::STATUS_OVERFLOW;
3811 // Mask out the value and U bit.
3813 // Set the U bit for non-negative values.
3816 insn |= ((residual & 0xf0) << 4) | (residual & 0xf);
3818 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3819 return This::STATUS_OKAY;
3822 // R_ARM_LDC_PC_G0: S + A - P
3823 // R_ARM_LDC_PC_G1: S + A - P
3824 // R_ARM_LDC_PC_G2: S + A - P
3825 // R_ARM_LDC_SB_G0: S + A - B(S)
3826 // R_ARM_LDC_SB_G1: S + A - B(S)
3827 // R_ARM_LDC_SB_G2: S + A - B(S)
3828 static inline typename This::Status
3829 arm_grp_ldc(unsigned char* view,
3830 const Sized_relobj_file<32, big_endian>* object,
3831 const Symbol_value<32>* psymval,
3833 Arm_address address)
3835 gold_assert(group >= 0 && group < 3);
3836 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3837 Valtype* wv = reinterpret_cast<Valtype*>(view);
3838 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3840 const int sign = (insn & 0x00800000) ? 1 : -1;
3841 int32_t addend = ((insn & 0xff) << 2) * sign;
3842 int32_t x = (psymval->value(object, addend) - address);
3843 // Calculate the relevant G(n-1) value to obtain this stage residual.
3845 Arm_relocate_functions::calc_grp_residual(abs(x), group - 1);
3846 if ((residual & 0x3) != 0 || residual >= 0x400)
3847 return This::STATUS_OVERFLOW;
3849 // Mask out the value and U bit.
3851 // Set the U bit for non-negative values.
3854 insn |= (residual >> 2);
3856 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3857 return This::STATUS_OKAY;
3861 // Relocate ARM long branches. This handles relocation types
3862 // R_ARM_CALL, R_ARM_JUMP24, R_ARM_PLT32 and R_ARM_XPC25.
3863 // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly
3864 // undefined and we do not use PLT in this relocation. In such a case,
3865 // the branch is converted into an NOP.
3867 template<bool big_endian>
3868 typename Arm_relocate_functions<big_endian>::Status
3869 Arm_relocate_functions<big_endian>::arm_branch_common(
3870 unsigned int r_type,
3871 const Relocate_info<32, big_endian>* relinfo,
3872 unsigned char* view,
3873 const Sized_symbol<32>* gsym,
3874 const Arm_relobj<big_endian>* object,
3876 const Symbol_value<32>* psymval,
3877 Arm_address address,
3878 Arm_address thumb_bit,
3879 bool is_weakly_undefined_without_plt)
3881 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3882 Valtype* wv = reinterpret_cast<Valtype*>(view);
3883 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3885 bool insn_is_b = (((val >> 28) & 0xf) <= 0xe)
3886 && ((val & 0x0f000000UL) == 0x0a000000UL);
3887 bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL;
3888 bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe)
3889 && ((val & 0x0f000000UL) == 0x0b000000UL);
3890 bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL;
3891 bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL;
3893 // Check that the instruction is valid.
3894 if (r_type == elfcpp::R_ARM_CALL)
3896 if (!insn_is_uncond_bl && !insn_is_blx)
3897 return This::STATUS_BAD_RELOC;
3899 else if (r_type == elfcpp::R_ARM_JUMP24)
3901 if (!insn_is_b && !insn_is_cond_bl)
3902 return This::STATUS_BAD_RELOC;
3904 else if (r_type == elfcpp::R_ARM_PLT32)
3906 if (!insn_is_any_branch)
3907 return This::STATUS_BAD_RELOC;
3909 else if (r_type == elfcpp::R_ARM_XPC25)
3911 // FIXME: AAELF document IH0044C does not say much about it other
3912 // than it being obsolete.
3913 if (!insn_is_any_branch)
3914 return This::STATUS_BAD_RELOC;
3919 // A branch to an undefined weak symbol is turned into a jump to
3920 // the next instruction unless a PLT entry will be created.
3921 // Do the same for local undefined symbols.
3922 // The jump to the next instruction is optimized as a NOP depending
3923 // on the architecture.
3924 const Target_arm<big_endian>* arm_target =
3925 Target_arm<big_endian>::default_target();
3926 if (is_weakly_undefined_without_plt)
3928 gold_assert(!parameters->options().relocatable());
3929 Valtype cond = val & 0xf0000000U;
3930 if (arm_target->may_use_arm_nop())
3931 val = cond | 0x0320f000;
3933 val = cond | 0x01a00000; // Using pre-UAL nop: mov r0, r0.
3934 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3935 return This::STATUS_OKAY;
3938 Valtype addend = Bits<26>::sign_extend32(val << 2);
3939 Valtype branch_target = psymval->value(object, addend);
3940 int32_t branch_offset = branch_target - address;
3942 // We need a stub if the branch offset is too large or if we need
3944 bool may_use_blx = arm_target->may_use_v5t_interworking();
3945 Reloc_stub* stub = NULL;
3947 if (!parameters->options().relocatable()
3948 && (Bits<26>::has_overflow32(branch_offset)
3949 || ((thumb_bit != 0)
3950 && !(may_use_blx && r_type == elfcpp::R_ARM_CALL))))
3952 Valtype unadjusted_branch_target = psymval->value(object, 0);
3954 Stub_type stub_type =
3955 Reloc_stub::stub_type_for_reloc(r_type, address,
3956 unadjusted_branch_target,
3958 if (stub_type != arm_stub_none)
3960 Stub_table<big_endian>* stub_table =
3961 object->stub_table(relinfo->data_shndx);
3962 gold_assert(stub_table != NULL);
3964 Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
3965 stub = stub_table->find_reloc_stub(stub_key);
3966 gold_assert(stub != NULL);
3967 thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0;
3968 branch_target = stub_table->address() + stub->offset() + addend;
3969 branch_offset = branch_target - address;
3970 gold_assert(!Bits<26>::has_overflow32(branch_offset));
3974 // At this point, if we still need to switch mode, the instruction
3975 // must either be a BLX or a BL that can be converted to a BLX.
3979 gold_assert(may_use_blx && r_type == elfcpp::R_ARM_CALL);
3980 val = (val & 0xffffff) | 0xfa000000 | ((branch_offset & 2) << 23);
3983 val = Bits<32>::bit_select32(val, (branch_offset >> 2), 0xffffffUL);
3984 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3985 return (Bits<26>::has_overflow32(branch_offset)
3986 ? This::STATUS_OVERFLOW
3987 : This::STATUS_OKAY);
3990 // Relocate THUMB long branches. This handles relocation types
3991 // R_ARM_THM_CALL, R_ARM_THM_JUMP24 and R_ARM_THM_XPC22.
3992 // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly
3993 // undefined and we do not use PLT in this relocation. In such a case,
3994 // the branch is converted into an NOP.
3996 template<bool big_endian>
3997 typename Arm_relocate_functions<big_endian>::Status
3998 Arm_relocate_functions<big_endian>::thumb_branch_common(
3999 unsigned int r_type,
4000 const Relocate_info<32, big_endian>* relinfo,
4001 unsigned char* view,
4002 const Sized_symbol<32>* gsym,
4003 const Arm_relobj<big_endian>* object,
4005 const Symbol_value<32>* psymval,
4006 Arm_address address,
4007 Arm_address thumb_bit,
4008 bool is_weakly_undefined_without_plt)
4010 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
4011 Valtype* wv = reinterpret_cast<Valtype*>(view);
4012 uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
4013 uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
4015 // FIXME: These tests are too loose and do not take THUMB/THUMB-2 difference
4017 bool is_bl_insn = (lower_insn & 0x1000U) == 0x1000U;
4018 bool is_blx_insn = (lower_insn & 0x1000U) == 0x0000U;
4020 // Check that the instruction is valid.
4021 if (r_type == elfcpp::R_ARM_THM_CALL)
4023 if (!is_bl_insn && !is_blx_insn)
4024 return This::STATUS_BAD_RELOC;
4026 else if (r_type == elfcpp::R_ARM_THM_JUMP24)
4028 // This cannot be a BLX.
4030 return This::STATUS_BAD_RELOC;
4032 else if (r_type == elfcpp::R_ARM_THM_XPC22)
4034 // Check for Thumb to Thumb call.
4036 return This::STATUS_BAD_RELOC;
4039 gold_warning(_("%s: Thumb BLX instruction targets "
4040 "thumb function '%s'."),
4041 object->name().c_str(),
4042 (gsym ? gsym->name() : "(local)"));
4043 // Convert BLX to BL.
4044 lower_insn |= 0x1000U;
4050 // A branch to an undefined weak symbol is turned into a jump to
4051 // the next instruction unless a PLT entry will be created.
4052 // The jump to the next instruction is optimized as a NOP.W for
4053 // Thumb-2 enabled architectures.
4054 const Target_arm<big_endian>* arm_target =
4055 Target_arm<big_endian>::default_target();
4056 if (is_weakly_undefined_without_plt)
4058 gold_assert(!parameters->options().relocatable());
4059 if (arm_target->may_use_thumb2_nop())
4061 elfcpp::Swap<16, big_endian>::writeval(wv, 0xf3af);
4062 elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0x8000);
4066 elfcpp::Swap<16, big_endian>::writeval(wv, 0xe000);
4067 elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0xbf00);
4069 return This::STATUS_OKAY;
4072 int32_t addend = This::thumb32_branch_offset(upper_insn, lower_insn);
4073 Arm_address branch_target = psymval->value(object, addend);
4075 // For BLX, bit 1 of target address comes from bit 1 of base address.
4076 bool may_use_blx = arm_target->may_use_v5t_interworking();
4077 if (thumb_bit == 0 && may_use_blx)
4078 branch_target = Bits<32>::bit_select32(branch_target, address, 0x2);
4080 int32_t branch_offset = branch_target - address;
4082 // We need a stub if the branch offset is too large or if we need
4084 bool thumb2 = arm_target->using_thumb2();
4085 if (!parameters->options().relocatable()
4086 && ((!thumb2 && Bits<23>::has_overflow32(branch_offset))
4087 || (thumb2 && Bits<25>::has_overflow32(branch_offset))
4088 || ((thumb_bit == 0)
4089 && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx)
4090 || r_type == elfcpp::R_ARM_THM_JUMP24))))
4092 Arm_address unadjusted_branch_target = psymval->value(object, 0);
4094 Stub_type stub_type =
4095 Reloc_stub::stub_type_for_reloc(r_type, address,
4096 unadjusted_branch_target,
4099 if (stub_type != arm_stub_none)
4101 Stub_table<big_endian>* stub_table =
4102 object->stub_table(relinfo->data_shndx);
4103 gold_assert(stub_table != NULL);
4105 Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
4106 Reloc_stub* stub = stub_table->find_reloc_stub(stub_key);
4107 gold_assert(stub != NULL);
4108 thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0;
4109 branch_target = stub_table->address() + stub->offset() + addend;
4110 if (thumb_bit == 0 && may_use_blx)
4111 branch_target = Bits<32>::bit_select32(branch_target, address, 0x2);
4112 branch_offset = branch_target - address;
4116 // At this point, if we still need to switch mode, the instruction
4117 // must either be a BLX or a BL that can be converted to a BLX.
4120 gold_assert(may_use_blx
4121 && (r_type == elfcpp::R_ARM_THM_CALL
4122 || r_type == elfcpp::R_ARM_THM_XPC22));
4123 // Make sure this is a BLX.
4124 lower_insn &= ~0x1000U;
4128 // Make sure this is a BL.
4129 lower_insn |= 0x1000U;
4132 // For a BLX instruction, make sure that the relocation is rounded up
4133 // to a word boundary. This follows the semantics of the instruction
4134 // which specifies that bit 1 of the target address will come from bit
4135 // 1 of the base address.
4136 if ((lower_insn & 0x5000U) == 0x4000U)
4137 gold_assert((branch_offset & 3) == 0);
4139 // Put BRANCH_OFFSET back into the insn. Assumes two's complement.
4140 // We use the Thumb-2 encoding, which is safe even if dealing with
4141 // a Thumb-1 instruction by virtue of our overflow check above. */
4142 upper_insn = This::thumb32_branch_upper(upper_insn, branch_offset);
4143 lower_insn = This::thumb32_branch_lower(lower_insn, branch_offset);
4145 elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn);
4146 elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn);
4148 gold_assert(!Bits<25>::has_overflow32(branch_offset));
4151 ? Bits<25>::has_overflow32(branch_offset)
4152 : Bits<23>::has_overflow32(branch_offset))
4153 ? This::STATUS_OVERFLOW
4154 : This::STATUS_OKAY);
4157 // Relocate THUMB-2 long conditional branches.
4158 // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly
4159 // undefined and we do not use PLT in this relocation. In such a case,
4160 // the branch is converted into an NOP.
4162 template<bool big_endian>
4163 typename Arm_relocate_functions<big_endian>::Status
4164 Arm_relocate_functions<big_endian>::thm_jump19(
4165 unsigned char* view,
4166 const Arm_relobj<big_endian>* object,
4167 const Symbol_value<32>* psymval,
4168 Arm_address address,
4169 Arm_address thumb_bit)
4171 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
4172 Valtype* wv = reinterpret_cast<Valtype*>(view);
4173 uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
4174 uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
4175 int32_t addend = This::thumb32_cond_branch_offset(upper_insn, lower_insn);
4177 Arm_address branch_target = psymval->value(object, addend);
4178 int32_t branch_offset = branch_target - address;
4180 // ??? Should handle interworking? GCC might someday try to
4181 // use this for tail calls.
4182 // FIXME: We do support thumb entry to PLT yet.
4185 gold_error(_("conditional branch to PLT in THUMB-2 not supported yet."));
4186 return This::STATUS_BAD_RELOC;
4189 // Put RELOCATION back into the insn.
4190 upper_insn = This::thumb32_cond_branch_upper(upper_insn, branch_offset);
4191 lower_insn = This::thumb32_cond_branch_lower(lower_insn, branch_offset);
4193 // Put the relocated value back in the object file:
4194 elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn);
4195 elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn);
4197 return (Bits<21>::has_overflow32(branch_offset)
4198 ? This::STATUS_OVERFLOW
4199 : This::STATUS_OKAY);
4202 // Get the GOT section, creating it if necessary.
4204 template<bool big_endian>
4205 Arm_output_data_got<big_endian>*
4206 Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout)
4208 if (this->got_ == NULL)
4210 gold_assert(symtab != NULL && layout != NULL);
4212 // When using -z now, we can treat .got as a relro section.
4213 // Without -z now, it is modified after program startup by lazy
4215 bool is_got_relro = parameters->options().now();
4216 Output_section_order got_order = (is_got_relro
4220 // Unlike some targets (.e.g x86), ARM does not use separate .got and
4221 // .got.plt sections in output. The output .got section contains both
4222 // PLT and non-PLT GOT entries.
4223 this->got_ = new Arm_output_data_got<big_endian>(symtab, layout);
4225 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
4226 (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
4227 this->got_, got_order, is_got_relro);
4229 // The old GNU linker creates a .got.plt section. We just
4230 // create another set of data in the .got section. Note that we
4231 // always create a PLT if we create a GOT, although the PLT
4233 this->got_plt_ = new Output_data_space(4, "** GOT PLT");
4234 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
4235 (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
4236 this->got_plt_, got_order, is_got_relro);
4238 // The first three entries are reserved.
4239 this->got_plt_->set_current_data_size(3 * 4);
4241 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
4242 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
4243 Symbol_table::PREDEFINED,
4245 0, 0, elfcpp::STT_OBJECT,
4247 elfcpp::STV_HIDDEN, 0,
4253 // Get the dynamic reloc section, creating it if necessary.
4255 template<bool big_endian>
4256 typename Target_arm<big_endian>::Reloc_section*
4257 Target_arm<big_endian>::rel_dyn_section(Layout* layout)
4259 if (this->rel_dyn_ == NULL)
4261 gold_assert(layout != NULL);
4262 this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
4263 layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
4264 elfcpp::SHF_ALLOC, this->rel_dyn_,
4265 ORDER_DYNAMIC_RELOCS, false);
4267 return this->rel_dyn_;
4270 // Insn_template methods.
4272 // Return byte size of an instruction template.
4275 Insn_template::size() const
4277 switch (this->type())
4280 case THUMB16_SPECIAL_TYPE:
4291 // Return alignment of an instruction template.
4294 Insn_template::alignment() const
4296 switch (this->type())
4299 case THUMB16_SPECIAL_TYPE:
4310 // Stub_template methods.
4312 Stub_template::Stub_template(
4313 Stub_type type, const Insn_template* insns,
4315 : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1),
4316 entry_in_thumb_mode_(false), relocs_()
4320 // Compute byte size and alignment of stub template.
4321 for (size_t i = 0; i < insn_count; i++)
4323 unsigned insn_alignment = insns[i].alignment();
4324 size_t insn_size = insns[i].size();
4325 gold_assert((offset & (insn_alignment - 1)) == 0);
4326 this->alignment_ = std::max(this->alignment_, insn_alignment);
4327 switch (insns[i].type())
4329 case Insn_template::THUMB16_TYPE:
4330 case Insn_template::THUMB16_SPECIAL_TYPE:
4332 this->entry_in_thumb_mode_ = true;
4335 case Insn_template::THUMB32_TYPE:
4336 if (insns[i].r_type() != elfcpp::R_ARM_NONE)
4337 this->relocs_.push_back(Reloc(i, offset));
4339 this->entry_in_thumb_mode_ = true;
4342 case Insn_template::ARM_TYPE:
4343 // Handle cases where the target is encoded within the
4345 if (insns[i].r_type() == elfcpp::R_ARM_JUMP24)
4346 this->relocs_.push_back(Reloc(i, offset));
4349 case Insn_template::DATA_TYPE:
4350 // Entry point cannot be data.
4351 gold_assert(i != 0);
4352 this->relocs_.push_back(Reloc(i, offset));
4358 offset += insn_size;
4360 this->size_ = offset;
4365 // Template to implement do_write for a specific target endianness.
4367 template<bool big_endian>
4369 Stub::do_fixed_endian_write(unsigned char* view, section_size_type view_size)
4371 const Stub_template* stub_template = this->stub_template();
4372 const Insn_template* insns = stub_template->insns();
4374 // FIXME: We do not handle BE8 encoding yet.
4375 unsigned char* pov = view;
4376 for (size_t i = 0; i < stub_template->insn_count(); i++)
4378 switch (insns[i].type())
4380 case Insn_template::THUMB16_TYPE:
4381 elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff);
4383 case Insn_template::THUMB16_SPECIAL_TYPE:
4384 elfcpp::Swap<16, big_endian>::writeval(
4386 this->thumb16_special(i));
4388 case Insn_template::THUMB32_TYPE:
4390 uint32_t hi = (insns[i].data() >> 16) & 0xffff;
4391 uint32_t lo = insns[i].data() & 0xffff;
4392 elfcpp::Swap<16, big_endian>::writeval(pov, hi);
4393 elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo);
4396 case Insn_template::ARM_TYPE:
4397 case Insn_template::DATA_TYPE:
4398 elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data());
4403 pov += insns[i].size();
4405 gold_assert(static_cast<section_size_type>(pov - view) == view_size);
4408 // Reloc_stub::Key methods.
4410 // Dump a Key as a string for debugging.
4413 Reloc_stub::Key::name() const
4415 if (this->r_sym_ == invalid_index)
4417 // Global symbol key name
4418 // <stub-type>:<symbol name>:<addend>.
4419 const std::string sym_name = this->u_.symbol->name();
4420 // We need to print two hex number and two colons. So just add 100 bytes
4421 // to the symbol name size.
4422 size_t len = sym_name.size() + 100;
4423 char* buffer = new char[len];
4424 int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_,
4425 sym_name.c_str(), this->addend_);
4426 gold_assert(c > 0 && c < static_cast<int>(len));
4428 return std::string(buffer);
4432 // local symbol key name
4433 // <stub-type>:<object>:<r_sym>:<addend>.
4434 const size_t len = 200;
4436 int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_,
4437 this->u_.relobj, this->r_sym_, this->addend_);
4438 gold_assert(c > 0 && c < static_cast<int>(len));
4439 return std::string(buffer);
4443 // Reloc_stub methods.
4445 // Determine the type of stub needed, if any, for a relocation of R_TYPE at
4446 // LOCATION to DESTINATION.
4447 // This code is based on the arm_type_of_stub function in
4448 // bfd/elf32-arm.c. We have changed the interface a little to keep the Stub
4452 Reloc_stub::stub_type_for_reloc(
4453 unsigned int r_type,
4454 Arm_address location,
4455 Arm_address destination,
4456 bool target_is_thumb)
4458 Stub_type stub_type = arm_stub_none;
4460 // This is a bit ugly but we want to avoid using a templated class for
4461 // big and little endianities.
4463 bool should_force_pic_veneer;
4466 if (parameters->target().is_big_endian())
4468 const Target_arm<true>* big_endian_target =
4469 Target_arm<true>::default_target();
4470 may_use_blx = big_endian_target->may_use_v5t_interworking();
4471 should_force_pic_veneer = big_endian_target->should_force_pic_veneer();
4472 thumb2 = big_endian_target->using_thumb2();
4473 thumb_only = big_endian_target->using_thumb_only();
4477 const Target_arm<false>* little_endian_target =
4478 Target_arm<false>::default_target();
4479 may_use_blx = little_endian_target->may_use_v5t_interworking();
4480 should_force_pic_veneer = little_endian_target->should_force_pic_veneer();
4481 thumb2 = little_endian_target->using_thumb2();
4482 thumb_only = little_endian_target->using_thumb_only();
4485 int64_t branch_offset;
4486 bool output_is_position_independent =
4487 parameters->options().output_is_position_independent();
4488 if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24)
4490 // For THUMB BLX instruction, bit 1 of target comes from bit 1 of the
4491 // base address (instruction address + 4).
4492 if ((r_type == elfcpp::R_ARM_THM_CALL) && may_use_blx && !target_is_thumb)
4493 destination = Bits<32>::bit_select32(destination, location, 0x2);
4494 branch_offset = static_cast<int64_t>(destination) - location;
4496 // Handle cases where:
4497 // - this call goes too far (different Thumb/Thumb2 max
4499 // - it's a Thumb->Arm call and blx is not available, or it's a
4500 // Thumb->Arm branch (not bl). A stub is needed in this case.
4502 && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET
4503 || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET)))
4505 && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET
4506 || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET)))
4507 || ((!target_is_thumb)
4508 && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx)
4509 || (r_type == elfcpp::R_ARM_THM_JUMP24))))
4511 if (target_is_thumb)
4516 stub_type = (output_is_position_independent
4517 || should_force_pic_veneer)
4520 && (r_type == elfcpp::R_ARM_THM_CALL))
4521 // V5T and above. Stub starts with ARM code, so
4522 // we must be able to switch mode before
4523 // reaching it, which is only possible for 'bl'
4524 // (ie R_ARM_THM_CALL relocation).
4525 ? arm_stub_long_branch_any_thumb_pic
4526 // On V4T, use Thumb code only.
4527 : arm_stub_long_branch_v4t_thumb_thumb_pic)
4531 && (r_type == elfcpp::R_ARM_THM_CALL))
4532 ? arm_stub_long_branch_any_any // V5T and above.
4533 : arm_stub_long_branch_v4t_thumb_thumb); // V4T.
4537 stub_type = (output_is_position_independent
4538 || should_force_pic_veneer)
4539 ? arm_stub_long_branch_thumb_only_pic // PIC stub.
4540 : arm_stub_long_branch_thumb_only; // non-PIC stub.
4547 // FIXME: We should check that the input section is from an
4548 // object that has interwork enabled.
4550 stub_type = (output_is_position_independent
4551 || should_force_pic_veneer)
4554 && (r_type == elfcpp::R_ARM_THM_CALL))
4555 ? arm_stub_long_branch_any_arm_pic // V5T and above.
4556 : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T.
4560 && (r_type == elfcpp::R_ARM_THM_CALL))
4561 ? arm_stub_long_branch_any_any // V5T and above.
4562 : arm_stub_long_branch_v4t_thumb_arm); // V4T.
4564 // Handle v4t short branches.
4565 if ((stub_type == arm_stub_long_branch_v4t_thumb_arm)
4566 && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET)
4567 && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET))
4568 stub_type = arm_stub_short_branch_v4t_thumb_arm;
4572 else if (r_type == elfcpp::R_ARM_CALL
4573 || r_type == elfcpp::R_ARM_JUMP24
4574 || r_type == elfcpp::R_ARM_PLT32)
4576 branch_offset = static_cast<int64_t>(destination) - location;
4577 if (target_is_thumb)
4581 // FIXME: We should check that the input section is from an
4582 // object that has interwork enabled.
4584 // We have an extra 2-bytes reach because of
4585 // the mode change (bit 24 (H) of BLX encoding).
4586 if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2)
4587 || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)
4588 || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx)
4589 || (r_type == elfcpp::R_ARM_JUMP24)
4590 || (r_type == elfcpp::R_ARM_PLT32))
4592 stub_type = (output_is_position_independent
4593 || should_force_pic_veneer)
4596 ? arm_stub_long_branch_any_thumb_pic// V5T and above.
4597 : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub.
4601 ? arm_stub_long_branch_any_any // V5T and above.
4602 : arm_stub_long_branch_v4t_arm_thumb); // V4T.
4608 if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET
4609 || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET))
4611 stub_type = (output_is_position_independent
4612 || should_force_pic_veneer)
4613 ? arm_stub_long_branch_any_arm_pic // PIC stubs.
4614 : arm_stub_long_branch_any_any; /// non-PIC.
4622 // Cortex_a8_stub methods.
4624 // Return the instruction for a THUMB16_SPECIAL_TYPE instruction template.
4625 // I is the position of the instruction template in the stub template.
4628 Cortex_a8_stub::do_thumb16_special(size_t i)
4630 // The only use of this is to copy condition code from a conditional
4631 // branch being worked around to the corresponding conditional branch in
4633 gold_assert(this->stub_template()->type() == arm_stub_a8_veneer_b_cond
4635 uint16_t data = this->stub_template()->insns()[i].data();
4636 gold_assert((data & 0xff00U) == 0xd000U);
4637 data |= ((this->original_insn_ >> 22) & 0xf) << 8;
4641 // Stub_factory methods.
4643 Stub_factory::Stub_factory()
4645 // The instruction template sequences are declared as static
4646 // objects and initialized first time the constructor runs.
4648 // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx
4649 // to reach the stub if necessary.
4650 static const Insn_template elf32_arm_stub_long_branch_any_any[] =
4652 Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4]
4653 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4654 // dcd R_ARM_ABS32(X)
4657 // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not
4659 static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] =
4661 Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0]
4662 Insn_template::arm_insn(0xe12fff1c), // bx ip
4663 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4664 // dcd R_ARM_ABS32(X)
4667 // Thumb -> Thumb long branch stub. Used on M-profile architectures.
4668 static const Insn_template elf32_arm_stub_long_branch_thumb_only[] =
4670 Insn_template::thumb16_insn(0xb401), // push {r0}
4671 Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8]
4672 Insn_template::thumb16_insn(0x4684), // mov ip, r0
4673 Insn_template::thumb16_insn(0xbc01), // pop {r0}
4674 Insn_template::thumb16_insn(0x4760), // bx ip
4675 Insn_template::thumb16_insn(0xbf00), // nop
4676 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4677 // dcd R_ARM_ABS32(X)
4680 // V4T Thumb -> Thumb long branch stub. Using the stack is not
4682 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] =
4684 Insn_template::thumb16_insn(0x4778), // bx pc
4685 Insn_template::thumb16_insn(0x46c0), // nop
4686 Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0]
4687 Insn_template::arm_insn(0xe12fff1c), // bx ip
4688 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4689 // dcd R_ARM_ABS32(X)
4692 // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not
4694 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] =
4696 Insn_template::thumb16_insn(0x4778), // bx pc
4697 Insn_template::thumb16_insn(0x46c0), // nop
4698 Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4]
4699 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4700 // dcd R_ARM_ABS32(X)
4703 // V4T Thumb -> ARM short branch stub. Shorter variant of the above
4704 // one, when the destination is close enough.
4705 static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] =
4707 Insn_template::thumb16_insn(0x4778), // bx pc
4708 Insn_template::thumb16_insn(0x46c0), // nop
4709 Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8)
4712 // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use
4713 // blx to reach the stub if necessary.
4714 static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] =
4716 Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc]
4717 Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip
4718 Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4),
4719 // dcd R_ARM_REL32(X-4)
4722 // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use
4723 // blx to reach the stub if necessary. We can not add into pc;
4724 // it is not guaranteed to mode switch (different in ARMv6 and
4726 static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] =
4728 Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4]
4729 Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip
4730 Insn_template::arm_insn(0xe12fff1c), // bx ip
4731 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0),
4732 // dcd R_ARM_REL32(X)
4735 // V4T ARM -> ARM long branch stub, PIC.
4736 static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] =
4738 Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4]
4739 Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip
4740 Insn_template::arm_insn(0xe12fff1c), // bx ip
4741 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0),
4742 // dcd R_ARM_REL32(X)
4745 // V4T Thumb -> ARM long branch stub, PIC.
4746 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] =
4748 Insn_template::thumb16_insn(0x4778), // bx pc
4749 Insn_template::thumb16_insn(0x46c0), // nop
4750 Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0]
4751 Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc
4752 Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4),
4753 // dcd R_ARM_REL32(X)
4756 // Thumb -> Thumb long branch stub, PIC. Used on M-profile
4758 static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] =
4760 Insn_template::thumb16_insn(0xb401), // push {r0}
4761 Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8]
4762 Insn_template::thumb16_insn(0x46fc), // mov ip, pc
4763 Insn_template::thumb16_insn(0x4484), // add ip, r0
4764 Insn_template::thumb16_insn(0xbc01), // pop {r0}
4765 Insn_template::thumb16_insn(0x4760), // bx ip
4766 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4),
4767 // dcd R_ARM_REL32(X)
4770 // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not
4772 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] =
4774 Insn_template::thumb16_insn(0x4778), // bx pc
4775 Insn_template::thumb16_insn(0x46c0), // nop
4776 Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4]
4777 Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip
4778 Insn_template::arm_insn(0xe12fff1c), // bx ip
4779 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0),
4780 // dcd R_ARM_REL32(X)
4783 // Cortex-A8 erratum-workaround stubs.
4785 // Stub used for conditional branches (which may be beyond +/-1MB away,
4786 // so we can't use a conditional branch to reach this stub).
4793 static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] =
4795 Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true
4796 Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after
4797 Insn_template::thumb32_b_insn(0xf000b800, -4) // true:
4801 // Stub used for b.w and bl.w instructions.
4803 static const Insn_template elf32_arm_stub_a8_veneer_b[] =
4805 Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest
4808 static const Insn_template elf32_arm_stub_a8_veneer_bl[] =
4810 Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest
4813 // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w
4814 // instruction (which switches to ARM mode) to point to this stub. Jump to
4815 // the real destination using an ARM-mode branch.
4816 static const Insn_template elf32_arm_stub_a8_veneer_blx[] =
4818 Insn_template::arm_rel_insn(0xea000000, -8) // b dest
4821 // Stub used to provide an interworking for R_ARM_V4BX relocation
4822 // (bx r[n] instruction).
4823 static const Insn_template elf32_arm_stub_v4_veneer_bx[] =
4825 Insn_template::arm_insn(0xe3100001), // tst r<n>, #1
4826 Insn_template::arm_insn(0x01a0f000), // moveq pc, r<n>
4827 Insn_template::arm_insn(0xe12fff10) // bx r<n>
4830 // Fill in the stub template look-up table. Stub templates are constructed
4831 // per instance of Stub_factory for fast look-up without locking
4832 // in a thread-enabled environment.
4834 this->stub_templates_[arm_stub_none] =
4835 new Stub_template(arm_stub_none, NULL, 0);
4837 #define DEF_STUB(x) \
4841 = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \
4842 Stub_type type = arm_stub_##x; \
4843 this->stub_templates_[type] = \
4844 new Stub_template(type, elf32_arm_stub_##x, array_size); \
4852 // Stub_table methods.
4854 // Remove all Cortex-A8 stub.
4856 template<bool big_endian>
4858 Stub_table<big_endian>::remove_all_cortex_a8_stubs()
4860 for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin();
4861 p != this->cortex_a8_stubs_.end();
4864 this->cortex_a8_stubs_.clear();
4867 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
4869 template<bool big_endian>
4871 Stub_table<big_endian>::relocate_stub(
4873 const Relocate_info<32, big_endian>* relinfo,
4874 Target_arm<big_endian>* arm_target,
4875 Output_section* output_section,
4876 unsigned char* view,
4877 Arm_address address,
4878 section_size_type view_size)
4880 const Stub_template* stub_template = stub->stub_template();
4881 if (stub_template->reloc_count() != 0)
4883 // Adjust view to cover the stub only.
4884 section_size_type offset = stub->offset();
4885 section_size_type stub_size = stub_template->size();
4886 gold_assert(offset + stub_size <= view_size);
4888 arm_target->relocate_stub(stub, relinfo, output_section, view + offset,
4889 address + offset, stub_size);
4893 // Relocate all stubs in this stub table.
4895 template<bool big_endian>
4897 Stub_table<big_endian>::relocate_stubs(
4898 const Relocate_info<32, big_endian>* relinfo,
4899 Target_arm<big_endian>* arm_target,
4900 Output_section* output_section,
4901 unsigned char* view,
4902 Arm_address address,
4903 section_size_type view_size)
4905 // If we are passed a view bigger than the stub table's. we need to
4907 gold_assert(address == this->address()
4909 == static_cast<section_size_type>(this->data_size())));
4911 // Relocate all relocation stubs.
4912 for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
4913 p != this->reloc_stubs_.end();
4915 this->relocate_stub(p->second, relinfo, arm_target, output_section, view,
4916 address, view_size);
4918 // Relocate all Cortex-A8 stubs.
4919 for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin();
4920 p != this->cortex_a8_stubs_.end();
4922 this->relocate_stub(p->second, relinfo, arm_target, output_section, view,
4923 address, view_size);
4925 // Relocate all ARM V4BX stubs.
4926 for (Arm_v4bx_stub_list::iterator p = this->arm_v4bx_stubs_.begin();
4927 p != this->arm_v4bx_stubs_.end();
4931 this->relocate_stub(*p, relinfo, arm_target, output_section, view,
4932 address, view_size);
4936 // Write out the stubs to file.
4938 template<bool big_endian>
4940 Stub_table<big_endian>::do_write(Output_file* of)
4942 off_t offset = this->offset();
4943 const section_size_type oview_size =
4944 convert_to_section_size_type(this->data_size());
4945 unsigned char* const oview = of->get_output_view(offset, oview_size);
4947 // Write relocation stubs.
4948 for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
4949 p != this->reloc_stubs_.end();
4952 Reloc_stub* stub = p->second;
4953 Arm_address address = this->address() + stub->offset();
4955 == align_address(address,
4956 stub->stub_template()->alignment()));
4957 stub->write(oview + stub->offset(), stub->stub_template()->size(),
4961 // Write Cortex-A8 stubs.
4962 for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin();
4963 p != this->cortex_a8_stubs_.end();
4966 Cortex_a8_stub* stub = p->second;
4967 Arm_address address = this->address() + stub->offset();
4969 == align_address(address,
4970 stub->stub_template()->alignment()));
4971 stub->write(oview + stub->offset(), stub->stub_template()->size(),
4975 // Write ARM V4BX relocation stubs.
4976 for (Arm_v4bx_stub_list::const_iterator p = this->arm_v4bx_stubs_.begin();
4977 p != this->arm_v4bx_stubs_.end();
4983 Arm_address address = this->address() + (*p)->offset();
4985 == align_address(address,
4986 (*p)->stub_template()->alignment()));
4987 (*p)->write(oview + (*p)->offset(), (*p)->stub_template()->size(),
4991 of->write_output_view(this->offset(), oview_size, oview);
4994 // Update the data size and address alignment of the stub table at the end
4995 // of a relaxation pass. Return true if either the data size or the
4996 // alignment changed in this relaxation pass.
4998 template<bool big_endian>
5000 Stub_table<big_endian>::update_data_size_and_addralign()
5002 // Go over all stubs in table to compute data size and address alignment.
5003 off_t size = this->reloc_stubs_size_;
5004 unsigned addralign = this->reloc_stubs_addralign_;
5006 for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin();
5007 p != this->cortex_a8_stubs_.end();
5010 const Stub_template* stub_template = p->second->stub_template();
5011 addralign = std::max(addralign, stub_template->alignment());
5012 size = (align_address(size, stub_template->alignment())
5013 + stub_template->size());
5016 for (Arm_v4bx_stub_list::const_iterator p = this->arm_v4bx_stubs_.begin();
5017 p != this->arm_v4bx_stubs_.end();
5023 const Stub_template* stub_template = (*p)->stub_template();
5024 addralign = std::max(addralign, stub_template->alignment());
5025 size = (align_address(size, stub_template->alignment())
5026 + stub_template->size());
5029 // Check if either data size or alignment changed in this pass.
5030 // Update prev_data_size_ and prev_addralign_. These will be used
5031 // as the current data size and address alignment for the next pass.
5032 bool changed = size != this->prev_data_size_;
5033 this->prev_data_size_ = size;
5035 if (addralign != this->prev_addralign_)
5037 this->prev_addralign_ = addralign;
5042 // Finalize the stubs. This sets the offsets of the stubs within the stub
5043 // table. It also marks all input sections needing Cortex-A8 workaround.
5045 template<bool big_endian>
5047 Stub_table<big_endian>::finalize_stubs()
5049 off_t off = this->reloc_stubs_size_;
5050 for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin();
5051 p != this->cortex_a8_stubs_.end();
5054 Cortex_a8_stub* stub = p->second;
5055 const Stub_template* stub_template = stub->stub_template();
5056 uint64_t stub_addralign = stub_template->alignment();
5057 off = align_address(off, stub_addralign);
5058 stub->set_offset(off);
5059 off += stub_template->size();
5061 // Mark input section so that we can determine later if a code section
5062 // needs the Cortex-A8 workaround quickly.
5063 Arm_relobj<big_endian>* arm_relobj =
5064 Arm_relobj<big_endian>::as_arm_relobj(stub->relobj());
5065 arm_relobj->mark_section_for_cortex_a8_workaround(stub->shndx());
5068 for (Arm_v4bx_stub_list::const_iterator p = this->arm_v4bx_stubs_.begin();
5069 p != this->arm_v4bx_stubs_.end();
5075 const Stub_template* stub_template = (*p)->stub_template();
5076 uint64_t stub_addralign = stub_template->alignment();
5077 off = align_address(off, stub_addralign);
5078 (*p)->set_offset(off);
5079 off += stub_template->size();
5082 gold_assert(off <= this->prev_data_size_);
5085 // Apply Cortex-A8 workaround to an address range between VIEW_ADDRESS
5086 // and VIEW_ADDRESS + VIEW_SIZE - 1. VIEW points to the mapped address
5087 // of the address range seen by the linker.
5089 template<bool big_endian>
5091 Stub_table<big_endian>::apply_cortex_a8_workaround_to_address_range(
5092 Target_arm<big_endian>* arm_target,
5093 unsigned char* view,
5094 Arm_address view_address,
5095 section_size_type view_size)
5097 // Cortex-A8 stubs are sorted by addresses of branches being fixed up.
5098 for (Cortex_a8_stub_list::const_iterator p =
5099 this->cortex_a8_stubs_.lower_bound(view_address);
5100 ((p != this->cortex_a8_stubs_.end())
5101 && (p->first < (view_address + view_size)));
5104 // We do not store the THUMB bit in the LSB of either the branch address
5105 // or the stub offset. There is no need to strip the LSB.
5106 Arm_address branch_address = p->first;
5107 const Cortex_a8_stub* stub = p->second;
5108 Arm_address stub_address = this->address() + stub->offset();
5110 // Offset of the branch instruction relative to this view.
5111 section_size_type offset =
5112 convert_to_section_size_type(branch_address - view_address);
5113 gold_assert((offset + 4) <= view_size);
5115 arm_target->apply_cortex_a8_workaround(stub, stub_address,
5116 view + offset, branch_address);
5120 // Arm_input_section methods.
5122 // Initialize an Arm_input_section.
5124 template<bool big_endian>
5126 Arm_input_section<big_endian>::init()
5128 Relobj* relobj = this->relobj();
5129 unsigned int shndx = this->shndx();
5131 // We have to cache original size, alignment and contents to avoid locking
5132 // the original file.
5133 this->original_addralign_ =
5134 convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx));
5136 // This is not efficient but we expect only a small number of relaxed
5137 // input sections for stubs.
5138 section_size_type section_size;
5139 const unsigned char* section_contents =
5140 relobj->section_contents(shndx, §ion_size, false);
5141 this->original_size_ =
5142 convert_types<uint32_t, uint64_t>(relobj->section_size(shndx));
5144 gold_assert(this->original_contents_ == NULL);
5145 this->original_contents_ = new unsigned char[section_size];
5146 memcpy(this->original_contents_, section_contents, section_size);
5148 // We want to make this look like the original input section after
5149 // output sections are finalized.
5150 Output_section* os = relobj->output_section(shndx);
5151 off_t offset = relobj->output_section_offset(shndx);
5152 gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx));
5153 this->set_address(os->address() + offset);
5154 this->set_file_offset(os->offset() + offset);
5156 this->set_current_data_size(this->original_size_);
5157 this->finalize_data_size();
5160 template<bool big_endian>
5162 Arm_input_section<big_endian>::do_write(Output_file* of)
5164 // We have to write out the original section content.
5165 gold_assert(this->original_contents_ != NULL);
5166 of->write(this->offset(), this->original_contents_,
5167 this->original_size_);
5169 // If this owns a stub table and it is not empty, write it.
5170 if (this->is_stub_table_owner() && !this->stub_table_->empty())
5171 this->stub_table_->write(of);
5174 // Finalize data size.
5176 template<bool big_endian>
5178 Arm_input_section<big_endian>::set_final_data_size()
5180 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
5182 if (this->is_stub_table_owner())
5184 this->stub_table_->finalize_data_size();
5185 off = align_address(off, this->stub_table_->addralign());
5186 off += this->stub_table_->data_size();
5188 this->set_data_size(off);
5191 // Reset address and file offset.
5193 template<bool big_endian>
5195 Arm_input_section<big_endian>::do_reset_address_and_file_offset()
5197 // Size of the original input section contents.
5198 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
5200 // If this is a stub table owner, account for the stub table size.
5201 if (this->is_stub_table_owner())
5203 Stub_table<big_endian>* stub_table = this->stub_table_;
5205 // Reset the stub table's address and file offset. The
5206 // current data size for child will be updated after that.
5207 stub_table_->reset_address_and_file_offset();
5208 off = align_address(off, stub_table_->addralign());
5209 off += stub_table->current_data_size();
5212 this->set_current_data_size(off);
5215 // Arm_exidx_cantunwind methods.
5217 // Write this to Output file OF for a fixed endianness.
5219 template<bool big_endian>
5221 Arm_exidx_cantunwind::do_fixed_endian_write(Output_file* of)
5223 off_t offset = this->offset();
5224 const section_size_type oview_size = 8;
5225 unsigned char* const oview = of->get_output_view(offset, oview_size);
5227 Output_section* os = this->relobj_->output_section(this->shndx_);
5228 gold_assert(os != NULL);
5230 Arm_relobj<big_endian>* arm_relobj =
5231 Arm_relobj<big_endian>::as_arm_relobj(this->relobj_);
5232 Arm_address output_offset =
5233 arm_relobj->get_output_section_offset(this->shndx_);
5234 Arm_address section_start;
5235 section_size_type section_size;
5237 // Find out the end of the text section referred by this.
5238 if (output_offset != Arm_relobj<big_endian>::invalid_address)
5240 section_start = os->address() + output_offset;
5241 const Arm_exidx_input_section* exidx_input_section =
5242 arm_relobj->exidx_input_section_by_link(this->shndx_);
5243 gold_assert(exidx_input_section != NULL);
5245 convert_to_section_size_type(exidx_input_section->text_size());
5249 // Currently this only happens for a relaxed section.
5250 const Output_relaxed_input_section* poris =
5251 os->find_relaxed_input_section(this->relobj_, this->shndx_);
5252 gold_assert(poris != NULL);
5253 section_start = poris->address();
5254 section_size = convert_to_section_size_type(poris->data_size());
5257 // We always append this to the end of an EXIDX section.
5258 Arm_address output_address = section_start + section_size;
5260 // Write out the entry. The first word either points to the beginning
5261 // or after the end of a text section. The second word is the special
5262 // EXIDX_CANTUNWIND value.
5263 uint32_t prel31_offset = output_address - this->address();
5264 if (Bits<31>::has_overflow32(offset))
5265 gold_error(_("PREL31 overflow in EXIDX_CANTUNWIND entry"));
5266 elfcpp::Swap_unaligned<32, big_endian>::writeval(oview,
5267 prel31_offset & 0x7fffffffU);
5268 elfcpp::Swap_unaligned<32, big_endian>::writeval(oview + 4,
5269 elfcpp::EXIDX_CANTUNWIND);
5271 of->write_output_view(this->offset(), oview_size, oview);
5274 // Arm_exidx_merged_section methods.
5276 // Constructor for Arm_exidx_merged_section.
5277 // EXIDX_INPUT_SECTION points to the unmodified EXIDX input section.
5278 // SECTION_OFFSET_MAP points to a section offset map describing how
5279 // parts of the input section are mapped to output. DELETED_BYTES is
5280 // the number of bytes deleted from the EXIDX input section.
5282 Arm_exidx_merged_section::Arm_exidx_merged_section(
5283 const Arm_exidx_input_section& exidx_input_section,
5284 const Arm_exidx_section_offset_map& section_offset_map,
5285 uint32_t deleted_bytes)
5286 : Output_relaxed_input_section(exidx_input_section.relobj(),
5287 exidx_input_section.shndx(),
5288 exidx_input_section.addralign()),
5289 exidx_input_section_(exidx_input_section),
5290 section_offset_map_(section_offset_map)
5292 // If we retain or discard the whole EXIDX input section, we would
5294 gold_assert(deleted_bytes != 0
5295 && deleted_bytes != this->exidx_input_section_.size());
5297 // Fix size here so that we do not need to implement set_final_data_size.
5298 uint32_t size = exidx_input_section.size() - deleted_bytes;
5299 this->set_data_size(size);
5300 this->fix_data_size();
5302 // Allocate buffer for section contents and build contents.
5303 this->section_contents_ = new unsigned char[size];
5306 // Build the contents of a merged EXIDX output section.
5309 Arm_exidx_merged_section::build_contents(
5310 const unsigned char* original_contents,
5311 section_size_type original_size)
5313 // Go over spans of input offsets and write only those that are not
5315 section_offset_type in_start = 0;
5316 section_offset_type out_start = 0;
5317 section_offset_type in_max =
5318 convert_types<section_offset_type>(original_size);
5319 section_offset_type out_max =
5320 convert_types<section_offset_type>(this->data_size());
5321 for (Arm_exidx_section_offset_map::const_iterator p =
5322 this->section_offset_map_.begin();
5323 p != this->section_offset_map_.end();
5326 section_offset_type in_end = p->first;
5327 gold_assert(in_end >= in_start);
5328 section_offset_type out_end = p->second;
5329 size_t in_chunk_size = convert_types<size_t>(in_end - in_start + 1);
5332 size_t out_chunk_size =
5333 convert_types<size_t>(out_end - out_start + 1);
5335 gold_assert(out_chunk_size == in_chunk_size
5336 && in_end < in_max && out_end < out_max);
5338 memcpy(this->section_contents_ + out_start,
5339 original_contents + in_start,
5341 out_start += out_chunk_size;
5343 in_start += in_chunk_size;
5347 // Given an input OBJECT, an input section index SHNDX within that
5348 // object, and an OFFSET relative to the start of that input
5349 // section, return whether or not the corresponding offset within
5350 // the output section is known. If this function returns true, it
5351 // sets *POUTPUT to the output offset. The value -1 indicates that
5352 // this input offset is being discarded.
5355 Arm_exidx_merged_section::do_output_offset(
5356 const Relobj* relobj,
5358 section_offset_type offset,
5359 section_offset_type* poutput) const
5361 // We only handle offsets for the original EXIDX input section.
5362 if (relobj != this->exidx_input_section_.relobj()
5363 || shndx != this->exidx_input_section_.shndx())
5366 section_offset_type section_size =
5367 convert_types<section_offset_type>(this->exidx_input_section_.size());
5368 if (offset < 0 || offset >= section_size)
5369 // Input offset is out of valid range.
5373 // We need to look up the section offset map to determine the output
5374 // offset. Find the reference point in map that is first offset
5375 // bigger than or equal to this offset.
5376 Arm_exidx_section_offset_map::const_iterator p =
5377 this->section_offset_map_.lower_bound(offset);
5379 // The section offset maps are build such that this should not happen if
5380 // input offset is in the valid range.
5381 gold_assert(p != this->section_offset_map_.end());
5383 // We need to check if this is dropped.
5384 section_offset_type ref = p->first;
5385 section_offset_type mapped_ref = p->second;
5387 if (mapped_ref != Arm_exidx_input_section::invalid_offset)
5388 // Offset is present in output.
5389 *poutput = mapped_ref + (offset - ref);
5391 // Offset is discarded owing to EXIDX entry merging.
5398 // Write this to output file OF.
5401 Arm_exidx_merged_section::do_write(Output_file* of)
5403 off_t offset = this->offset();
5404 const section_size_type oview_size = this->data_size();
5405 unsigned char* const oview = of->get_output_view(offset, oview_size);
5407 Output_section* os = this->relobj()->output_section(this->shndx());
5408 gold_assert(os != NULL);
5410 memcpy(oview, this->section_contents_, oview_size);
5411 of->write_output_view(this->offset(), oview_size, oview);
5414 // Arm_exidx_fixup methods.
5416 // Append an EXIDX_CANTUNWIND in the current output section if the last entry
5417 // is not an EXIDX_CANTUNWIND entry already. The new EXIDX_CANTUNWIND entry
5418 // points to the end of the last seen EXIDX section.
5421 Arm_exidx_fixup::add_exidx_cantunwind_as_needed()
5423 if (this->last_unwind_type_ != UT_EXIDX_CANTUNWIND
5424 && this->last_input_section_ != NULL)
5426 Relobj* relobj = this->last_input_section_->relobj();
5427 unsigned int text_shndx = this->last_input_section_->link();
5428 Arm_exidx_cantunwind* cantunwind =
5429 new Arm_exidx_cantunwind(relobj, text_shndx);
5430 this->exidx_output_section_->add_output_section_data(cantunwind);
5431 this->last_unwind_type_ = UT_EXIDX_CANTUNWIND;
5435 // Process an EXIDX section entry in input. Return whether this entry
5436 // can be deleted in the output. SECOND_WORD in the second word of the
5440 Arm_exidx_fixup::process_exidx_entry(uint32_t second_word)
5443 if (second_word == elfcpp::EXIDX_CANTUNWIND)
5445 // Merge if previous entry is also an EXIDX_CANTUNWIND.
5446 delete_entry = this->last_unwind_type_ == UT_EXIDX_CANTUNWIND;
5447 this->last_unwind_type_ = UT_EXIDX_CANTUNWIND;
5449 else if ((second_word & 0x80000000) != 0)
5451 // Inlined unwinding data. Merge if equal to previous.
5452 delete_entry = (merge_exidx_entries_
5453 && this->last_unwind_type_ == UT_INLINED_ENTRY
5454 && this->last_inlined_entry_ == second_word);
5455 this->last_unwind_type_ = UT_INLINED_ENTRY;
5456 this->last_inlined_entry_ = second_word;
5460 // Normal table entry. In theory we could merge these too,
5461 // but duplicate entries are likely to be much less common.
5462 delete_entry = false;
5463 this->last_unwind_type_ = UT_NORMAL_ENTRY;
5465 return delete_entry;
5468 // Update the current section offset map during EXIDX section fix-up.
5469 // If there is no map, create one. INPUT_OFFSET is the offset of a
5470 // reference point, DELETED_BYTES is the number of deleted by in the
5471 // section so far. If DELETE_ENTRY is true, the reference point and
5472 // all offsets after the previous reference point are discarded.
5475 Arm_exidx_fixup::update_offset_map(
5476 section_offset_type input_offset,
5477 section_size_type deleted_bytes,
5480 if (this->section_offset_map_ == NULL)
5481 this->section_offset_map_ = new Arm_exidx_section_offset_map();
5482 section_offset_type output_offset;
5484 output_offset = Arm_exidx_input_section::invalid_offset;
5486 output_offset = input_offset - deleted_bytes;
5487 (*this->section_offset_map_)[input_offset] = output_offset;
5490 // Process EXIDX_INPUT_SECTION for EXIDX entry merging. Return the number of
5491 // bytes deleted. SECTION_CONTENTS points to the contents of the EXIDX
5492 // section and SECTION_SIZE is the number of bytes pointed by SECTION_CONTENTS.
5493 // If some entries are merged, also store a pointer to a newly created
5494 // Arm_exidx_section_offset_map object in *PSECTION_OFFSET_MAP. The caller
5495 // owns the map and is responsible for releasing it after use.
5497 template<bool big_endian>
5499 Arm_exidx_fixup::process_exidx_section(
5500 const Arm_exidx_input_section* exidx_input_section,
5501 const unsigned char* section_contents,
5502 section_size_type section_size,
5503 Arm_exidx_section_offset_map** psection_offset_map)
5505 Relobj* relobj = exidx_input_section->relobj();
5506 unsigned shndx = exidx_input_section->shndx();
5508 if ((section_size % 8) != 0)
5510 // Something is wrong with this section. Better not touch it.
5511 gold_error(_("uneven .ARM.exidx section size in %s section %u"),
5512 relobj->name().c_str(), shndx);
5513 this->last_input_section_ = exidx_input_section;
5514 this->last_unwind_type_ = UT_NONE;
5518 uint32_t deleted_bytes = 0;
5519 bool prev_delete_entry = false;
5520 gold_assert(this->section_offset_map_ == NULL);
5522 for (section_size_type i = 0; i < section_size; i += 8)
5524 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
5526 reinterpret_cast<const Valtype*>(section_contents + i + 4);
5527 uint32_t second_word = elfcpp::Swap<32, big_endian>::readval(wv);
5529 bool delete_entry = this->process_exidx_entry(second_word);
5531 // Entry deletion causes changes in output offsets. We use a std::map
5532 // to record these. And entry (x, y) means input offset x
5533 // is mapped to output offset y. If y is invalid_offset, then x is
5534 // dropped in the output. Because of the way std::map::lower_bound
5535 // works, we record the last offset in a region w.r.t to keeping or
5536 // dropping. If there is no entry (x0, y0) for an input offset x0,
5537 // the output offset y0 of it is determined by the output offset y1 of
5538 // the smallest input offset x1 > x0 that there is an (x1, y1) entry
5539 // in the map. If y1 is not -1, then y0 = y1 + x0 - x1. Otherwise, y1
5541 if (delete_entry != prev_delete_entry && i != 0)
5542 this->update_offset_map(i - 1, deleted_bytes, prev_delete_entry);
5544 // Update total deleted bytes for this entry.
5548 prev_delete_entry = delete_entry;
5551 // If section offset map is not NULL, make an entry for the end of
5553 if (this->section_offset_map_ != NULL)
5554 update_offset_map(section_size - 1, deleted_bytes, prev_delete_entry);
5556 *psection_offset_map = this->section_offset_map_;
5557 this->section_offset_map_ = NULL;
5558 this->last_input_section_ = exidx_input_section;
5560 // Set the first output text section so that we can link the EXIDX output
5561 // section to it. Ignore any EXIDX input section that is completely merged.
5562 if (this->first_output_text_section_ == NULL
5563 && deleted_bytes != section_size)
5565 unsigned int link = exidx_input_section->link();
5566 Output_section* os = relobj->output_section(link);
5567 gold_assert(os != NULL);
5568 this->first_output_text_section_ = os;
5571 return deleted_bytes;
5574 // Arm_output_section methods.
5576 // Create a stub group for input sections from BEGIN to END. OWNER
5577 // points to the input section to be the owner a new stub table.
5579 template<bool big_endian>
5581 Arm_output_section<big_endian>::create_stub_group(
5582 Input_section_list::const_iterator begin,
5583 Input_section_list::const_iterator end,
5584 Input_section_list::const_iterator owner,
5585 Target_arm<big_endian>* target,
5586 std::vector<Output_relaxed_input_section*>* new_relaxed_sections,
5589 // We use a different kind of relaxed section in an EXIDX section.
5590 // The static casting from Output_relaxed_input_section to
5591 // Arm_input_section is invalid in an EXIDX section. We are okay
5592 // because we should not be calling this for an EXIDX section.
5593 gold_assert(this->type() != elfcpp::SHT_ARM_EXIDX);
5595 // Currently we convert ordinary input sections into relaxed sections only
5596 // at this point but we may want to support creating relaxed input section
5597 // very early. So we check here to see if owner is already a relaxed
5600 Arm_input_section<big_endian>* arm_input_section;
5601 if (owner->is_relaxed_input_section())
5604 Arm_input_section<big_endian>::as_arm_input_section(
5605 owner->relaxed_input_section());
5609 gold_assert(owner->is_input_section());
5610 // Create a new relaxed input section. We need to lock the original
5612 Task_lock_obj<Object> tl(task, owner->relobj());
5614 target->new_arm_input_section(owner->relobj(), owner->shndx());
5615 new_relaxed_sections->push_back(arm_input_section);
5618 // Create a stub table.
5619 Stub_table<big_endian>* stub_table =
5620 target->new_stub_table(arm_input_section);
5622 arm_input_section->set_stub_table(stub_table);
5624 Input_section_list::const_iterator p = begin;
5625 Input_section_list::const_iterator prev_p;
5627 // Look for input sections or relaxed input sections in [begin ... end].
5630 if (p->is_input_section() || p->is_relaxed_input_section())
5632 // The stub table information for input sections live
5633 // in their objects.
5634 Arm_relobj<big_endian>* arm_relobj =
5635 Arm_relobj<big_endian>::as_arm_relobj(p->relobj());
5636 arm_relobj->set_stub_table(p->shndx(), stub_table);
5640 while (prev_p != end);
5643 // Group input sections for stub generation. GROUP_SIZE is roughly the limit
5644 // of stub groups. We grow a stub group by adding input section until the
5645 // size is just below GROUP_SIZE. The last input section will be converted
5646 // into a stub table. If STUB_ALWAYS_AFTER_BRANCH is false, we also add
5647 // input section after the stub table, effectively double the group size.
5649 // This is similar to the group_sections() function in elf32-arm.c but is
5650 // implemented differently.
5652 template<bool big_endian>
5654 Arm_output_section<big_endian>::group_sections(
5655 section_size_type group_size,
5656 bool stubs_always_after_branch,
5657 Target_arm<big_endian>* target,
5660 // States for grouping.
5663 // No group is being built.
5665 // A group is being built but the stub table is not found yet.
5666 // We keep group a stub group until the size is just under GROUP_SIZE.
5667 // The last input section in the group will be used as the stub table.
5668 FINDING_STUB_SECTION,
5669 // A group is being built and we have already found a stub table.
5670 // We enter this state to grow a stub group by adding input section
5671 // after the stub table. This effectively doubles the group size.
5675 // Any newly created relaxed sections are stored here.
5676 std::vector<Output_relaxed_input_section*> new_relaxed_sections;
5678 State state = NO_GROUP;
5679 section_size_type off = 0;
5680 section_size_type group_begin_offset = 0;
5681 section_size_type group_end_offset = 0;
5682 section_size_type stub_table_end_offset = 0;
5683 Input_section_list::const_iterator group_begin =
5684 this->input_sections().end();
5685 Input_section_list::const_iterator stub_table =
5686 this->input_sections().end();
5687 Input_section_list::const_iterator group_end = this->input_sections().end();
5688 for (Input_section_list::const_iterator p = this->input_sections().begin();
5689 p != this->input_sections().end();
5692 section_size_type section_begin_offset =
5693 align_address(off, p->addralign());
5694 section_size_type section_end_offset =
5695 section_begin_offset + p->data_size();
5697 // Check to see if we should group the previously seen sections.
5703 case FINDING_STUB_SECTION:
5704 // Adding this section makes the group larger than GROUP_SIZE.
5705 if (section_end_offset - group_begin_offset >= group_size)
5707 if (stubs_always_after_branch)
5709 gold_assert(group_end != this->input_sections().end());
5710 this->create_stub_group(group_begin, group_end, group_end,
5711 target, &new_relaxed_sections,
5717 // But wait, there's more! Input sections up to
5718 // stub_group_size bytes after the stub table can be
5719 // handled by it too.
5720 state = HAS_STUB_SECTION;
5721 stub_table = group_end;
5722 stub_table_end_offset = group_end_offset;
5727 case HAS_STUB_SECTION:
5728 // Adding this section makes the post stub-section group larger
5730 if (section_end_offset - stub_table_end_offset >= group_size)
5732 gold_assert(group_end != this->input_sections().end());
5733 this->create_stub_group(group_begin, group_end, stub_table,
5734 target, &new_relaxed_sections, task);
5743 // If we see an input section and currently there is no group, start
5744 // a new one. Skip any empty sections. We look at the data size
5745 // instead of calling p->relobj()->section_size() to avoid locking.
5746 if ((p->is_input_section() || p->is_relaxed_input_section())
5747 && (p->data_size() != 0))
5749 if (state == NO_GROUP)
5751 state = FINDING_STUB_SECTION;
5753 group_begin_offset = section_begin_offset;
5756 // Keep track of the last input section seen.
5758 group_end_offset = section_end_offset;
5761 off = section_end_offset;
5764 // Create a stub group for any ungrouped sections.
5765 if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION)
5767 gold_assert(group_end != this->input_sections().end());
5768 this->create_stub_group(group_begin, group_end,
5769 (state == FINDING_STUB_SECTION
5772 target, &new_relaxed_sections, task);
5775 // Convert input section into relaxed input section in a batch.
5776 if (!new_relaxed_sections.empty())
5777 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections);
5779 // Update the section offsets
5780 for (size_t i = 0; i < new_relaxed_sections.size(); ++i)
5782 Arm_relobj<big_endian>* arm_relobj =
5783 Arm_relobj<big_endian>::as_arm_relobj(
5784 new_relaxed_sections[i]->relobj());
5785 unsigned int shndx = new_relaxed_sections[i]->shndx();
5786 // Tell Arm_relobj that this input section is converted.
5787 arm_relobj->convert_input_section_to_relaxed_section(shndx);
5791 // Append non empty text sections in this to LIST in ascending
5792 // order of their position in this.
5794 template<bool big_endian>
5796 Arm_output_section<big_endian>::append_text_sections_to_list(
5797 Text_section_list* list)
5799 gold_assert((this->flags() & elfcpp::SHF_ALLOC) != 0);
5801 for (Input_section_list::const_iterator p = this->input_sections().begin();
5802 p != this->input_sections().end();
5805 // We only care about plain or relaxed input sections. We also
5806 // ignore any merged sections.
5807 if (p->is_input_section() || p->is_relaxed_input_section())
5808 list->push_back(Text_section_list::value_type(p->relobj(),
5813 template<bool big_endian>
5815 Arm_output_section<big_endian>::fix_exidx_coverage(
5817 const Text_section_list& sorted_text_sections,
5818 Symbol_table* symtab,
5819 bool merge_exidx_entries,
5822 // We should only do this for the EXIDX output section.
5823 gold_assert(this->type() == elfcpp::SHT_ARM_EXIDX);
5825 // We don't want the relaxation loop to undo these changes, so we discard
5826 // the current saved states and take another one after the fix-up.
5827 this->discard_states();
5829 // Remove all input sections.
5830 uint64_t address = this->address();
5831 typedef std::list<Output_section::Input_section> Input_section_list;
5832 Input_section_list input_sections;
5833 this->reset_address_and_file_offset();
5834 this->get_input_sections(address, std::string(""), &input_sections);
5836 if (!this->input_sections().empty())
5837 gold_error(_("Found non-EXIDX input sections in EXIDX output section"));
5839 // Go through all the known input sections and record them.
5840 typedef Unordered_set<Section_id, Section_id_hash> Section_id_set;
5841 typedef Unordered_map<Section_id, const Output_section::Input_section*,
5842 Section_id_hash> Text_to_exidx_map;
5843 Text_to_exidx_map text_to_exidx_map;
5844 for (Input_section_list::const_iterator p = input_sections.begin();
5845 p != input_sections.end();
5848 // This should never happen. At this point, we should only see
5849 // plain EXIDX input sections.
5850 gold_assert(!p->is_relaxed_input_section());
5851 text_to_exidx_map[Section_id(p->relobj(), p->shndx())] = &(*p);
5854 Arm_exidx_fixup exidx_fixup(this, merge_exidx_entries);
5856 // Go over the sorted text sections.
5857 typedef Unordered_set<Section_id, Section_id_hash> Section_id_set;
5858 Section_id_set processed_input_sections;
5859 for (Text_section_list::const_iterator p = sorted_text_sections.begin();
5860 p != sorted_text_sections.end();
5863 Relobj* relobj = p->first;
5864 unsigned int shndx = p->second;
5866 Arm_relobj<big_endian>* arm_relobj =
5867 Arm_relobj<big_endian>::as_arm_relobj(relobj);
5868 const Arm_exidx_input_section* exidx_input_section =
5869 arm_relobj->exidx_input_section_by_link(shndx);
5871 // If this text section has no EXIDX section or if the EXIDX section
5872 // has errors, force an EXIDX_CANTUNWIND entry pointing to the end
5873 // of the last seen EXIDX section.
5874 if (exidx_input_section == NULL || exidx_input_section->has_errors())
5876 exidx_fixup.add_exidx_cantunwind_as_needed();
5880 Relobj* exidx_relobj = exidx_input_section->relobj();
5881 unsigned int exidx_shndx = exidx_input_section->shndx();
5882 Section_id sid(exidx_relobj, exidx_shndx);
5883 Text_to_exidx_map::const_iterator iter = text_to_exidx_map.find(sid);
5884 if (iter == text_to_exidx_map.end())
5886 // This is odd. We have not seen this EXIDX input section before.
5887 // We cannot do fix-up. If we saw a SECTIONS clause in a script,
5888 // issue a warning instead. We assume the user knows what he
5889 // or she is doing. Otherwise, this is an error.
5890 if (layout->script_options()->saw_sections_clause())
5891 gold_warning(_("unwinding may not work because EXIDX input section"
5892 " %u of %s is not in EXIDX output section"),
5893 exidx_shndx, exidx_relobj->name().c_str());
5895 gold_error(_("unwinding may not work because EXIDX input section"
5896 " %u of %s is not in EXIDX output section"),
5897 exidx_shndx, exidx_relobj->name().c_str());
5899 exidx_fixup.add_exidx_cantunwind_as_needed();
5903 // We need to access the contents of the EXIDX section, lock the
5905 Task_lock_obj<Object> tl(task, exidx_relobj);
5906 section_size_type exidx_size;
5907 const unsigned char* exidx_contents =
5908 exidx_relobj->section_contents(exidx_shndx, &exidx_size, false);
5910 // Fix up coverage and append input section to output data list.
5911 Arm_exidx_section_offset_map* section_offset_map = NULL;
5912 uint32_t deleted_bytes =
5913 exidx_fixup.process_exidx_section<big_endian>(exidx_input_section,
5916 §ion_offset_map);
5918 if (deleted_bytes == exidx_input_section->size())
5920 // The whole EXIDX section got merged. Remove it from output.
5921 gold_assert(section_offset_map == NULL);
5922 exidx_relobj->set_output_section(exidx_shndx, NULL);
5924 // All local symbols defined in this input section will be dropped.
5925 // We need to adjust output local symbol count.
5926 arm_relobj->set_output_local_symbol_count_needs_update();
5928 else if (deleted_bytes > 0)
5930 // Some entries are merged. We need to convert this EXIDX input
5931 // section into a relaxed section.
5932 gold_assert(section_offset_map != NULL);
5934 Arm_exidx_merged_section* merged_section =
5935 new Arm_exidx_merged_section(*exidx_input_section,
5936 *section_offset_map, deleted_bytes);
5937 merged_section->build_contents(exidx_contents, exidx_size);
5939 const std::string secname = exidx_relobj->section_name(exidx_shndx);
5940 this->add_relaxed_input_section(layout, merged_section, secname);
5941 arm_relobj->convert_input_section_to_relaxed_section(exidx_shndx);
5943 // All local symbols defined in discarded portions of this input
5944 // section will be dropped. We need to adjust output local symbol
5946 arm_relobj->set_output_local_symbol_count_needs_update();
5950 // Just add back the EXIDX input section.
5951 gold_assert(section_offset_map == NULL);
5952 const Output_section::Input_section* pis = iter->second;
5953 gold_assert(pis->is_input_section());
5954 this->add_script_input_section(*pis);
5957 processed_input_sections.insert(Section_id(exidx_relobj, exidx_shndx));
5960 // Insert an EXIDX_CANTUNWIND entry at the end of output if necessary.
5961 exidx_fixup.add_exidx_cantunwind_as_needed();
5963 // Remove any known EXIDX input sections that are not processed.
5964 for (Input_section_list::const_iterator p = input_sections.begin();
5965 p != input_sections.end();
5968 if (processed_input_sections.find(Section_id(p->relobj(), p->shndx()))
5969 == processed_input_sections.end())
5971 // We discard a known EXIDX section because its linked
5972 // text section has been folded by ICF. We also discard an
5973 // EXIDX section with error, the output does not matter in this
5974 // case. We do this to avoid triggering asserts.
5975 Arm_relobj<big_endian>* arm_relobj =
5976 Arm_relobj<big_endian>::as_arm_relobj(p->relobj());
5977 const Arm_exidx_input_section* exidx_input_section =
5978 arm_relobj->exidx_input_section_by_shndx(p->shndx());
5979 gold_assert(exidx_input_section != NULL);
5980 if (!exidx_input_section->has_errors())
5982 unsigned int text_shndx = exidx_input_section->link();
5983 gold_assert(symtab->is_section_folded(p->relobj(), text_shndx));
5986 // Remove this from link. We also need to recount the
5988 p->relobj()->set_output_section(p->shndx(), NULL);
5989 arm_relobj->set_output_local_symbol_count_needs_update();
5993 // Link exidx output section to the first seen output section and
5994 // set correct entry size.
5995 this->set_link_section(exidx_fixup.first_output_text_section());
5996 this->set_entsize(8);
5998 // Make changes permanent.
5999 this->save_states();
6000 this->set_section_offsets_need_adjustment();
6003 // Link EXIDX output sections to text output sections.
6005 template<bool big_endian>
6007 Arm_output_section<big_endian>::set_exidx_section_link()
6009 gold_assert(this->type() == elfcpp::SHT_ARM_EXIDX);
6010 if (!this->input_sections().empty())
6012 Input_section_list::const_iterator p = this->input_sections().begin();
6013 Arm_relobj<big_endian>* arm_relobj =
6014 Arm_relobj<big_endian>::as_arm_relobj(p->relobj());
6015 unsigned exidx_shndx = p->shndx();
6016 const Arm_exidx_input_section* exidx_input_section =
6017 arm_relobj->exidx_input_section_by_shndx(exidx_shndx);
6018 gold_assert(exidx_input_section != NULL);
6019 unsigned int text_shndx = exidx_input_section->link();
6020 Output_section* os = arm_relobj->output_section(text_shndx);
6021 this->set_link_section(os);
6025 // Arm_relobj methods.
6027 // Determine if an input section is scannable for stub processing. SHDR is
6028 // the header of the section and SHNDX is the section index. OS is the output
6029 // section for the input section and SYMTAB is the global symbol table used to
6030 // look up ICF information.
6032 template<bool big_endian>
6034 Arm_relobj<big_endian>::section_is_scannable(
6035 const elfcpp::Shdr<32, big_endian>& shdr,
6037 const Output_section* os,
6038 const Symbol_table* symtab)
6040 // Skip any empty sections, unallocated sections or sections whose
6041 // type are not SHT_PROGBITS.
6042 if (shdr.get_sh_size() == 0
6043 || (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0
6044 || shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
6047 // Skip any discarded or ICF'ed sections.
6048 if (os == NULL || symtab->is_section_folded(this, shndx))
6051 // If this requires special offset handling, check to see if it is
6052 // a relaxed section. If this is not, then it is a merged section that
6053 // we cannot handle.
6054 if (this->is_output_section_offset_invalid(shndx))
6056 const Output_relaxed_input_section* poris =
6057 os->find_relaxed_input_section(this, shndx);
6065 // Determine if we want to scan the SHNDX-th section for relocation stubs.
6066 // This is a helper for Arm_relobj::scan_sections_for_stubs() below.
6068 template<bool big_endian>
6070 Arm_relobj<big_endian>::section_needs_reloc_stub_scanning(
6071 const elfcpp::Shdr<32, big_endian>& shdr,
6072 const Relobj::Output_sections& out_sections,
6073 const Symbol_table* symtab,
6074 const unsigned char* pshdrs)
6076 unsigned int sh_type = shdr.get_sh_type();
6077 if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
6080 // Ignore empty section.
6081 off_t sh_size = shdr.get_sh_size();
6085 // Ignore reloc section with unexpected symbol table. The
6086 // error will be reported in the final link.
6087 if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx())
6090 unsigned int reloc_size;
6091 if (sh_type == elfcpp::SHT_REL)
6092 reloc_size = elfcpp::Elf_sizes<32>::rel_size;
6094 reloc_size = elfcpp::Elf_sizes<32>::rela_size;
6096 // Ignore reloc section with unexpected entsize or uneven size.
6097 // The error will be reported in the final link.
6098 if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0)
6101 // Ignore reloc section with bad info. This error will be
6102 // reported in the final link.
6103 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
6104 if (index >= this->shnum())
6107 const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6108 const elfcpp::Shdr<32, big_endian> text_shdr(pshdrs + index * shdr_size);
6109 return this->section_is_scannable(text_shdr, index,
6110 out_sections[index], symtab);
6113 // Return the output address of either a plain input section or a relaxed
6114 // input section. SHNDX is the section index. We define and use this
6115 // instead of calling Output_section::output_address because that is slow
6116 // for large output.
6118 template<bool big_endian>
6120 Arm_relobj<big_endian>::simple_input_section_output_address(
6124 if (this->is_output_section_offset_invalid(shndx))
6126 const Output_relaxed_input_section* poris =
6127 os->find_relaxed_input_section(this, shndx);
6128 // We do not handle merged sections here.
6129 gold_assert(poris != NULL);
6130 return poris->address();
6133 return os->address() + this->get_output_section_offset(shndx);
6136 // Determine if we want to scan the SHNDX-th section for non-relocation stubs.
6137 // This is a helper for Arm_relobj::scan_sections_for_stubs() below.
6139 template<bool big_endian>
6141 Arm_relobj<big_endian>::section_needs_cortex_a8_stub_scanning(
6142 const elfcpp::Shdr<32, big_endian>& shdr,
6145 const Symbol_table* symtab)
6147 if (!this->section_is_scannable(shdr, shndx, os, symtab))
6150 // If the section does not cross any 4K-boundaries, it does not need to
6152 Arm_address address = this->simple_input_section_output_address(shndx, os);
6153 if ((address & ~0xfffU) == ((address + shdr.get_sh_size() - 1) & ~0xfffU))
6159 // Scan a section for Cortex-A8 workaround.
6161 template<bool big_endian>
6163 Arm_relobj<big_endian>::scan_section_for_cortex_a8_erratum(
6164 const elfcpp::Shdr<32, big_endian>& shdr,
6167 Target_arm<big_endian>* arm_target)
6169 // Look for the first mapping symbol in this section. It should be
6171 Mapping_symbol_position section_start(shndx, 0);
6172 typename Mapping_symbols_info::const_iterator p =
6173 this->mapping_symbols_info_.lower_bound(section_start);
6175 // There are no mapping symbols for this section. Treat it as a data-only
6176 // section. Issue a warning if section is marked as containing
6178 if (p == this->mapping_symbols_info_.end() || p->first.first != shndx)
6180 if ((this->section_flags(shndx) & elfcpp::SHF_EXECINSTR) != 0)
6181 gold_warning(_("cannot scan executable section %u of %s for Cortex-A8 "
6182 "erratum because it has no mapping symbols."),
6183 shndx, this->name().c_str());
6187 Arm_address output_address =
6188 this->simple_input_section_output_address(shndx, os);
6190 // Get the section contents.
6191 section_size_type input_view_size = 0;
6192 const unsigned char* input_view =
6193 this->section_contents(shndx, &input_view_size, false);
6195 // We need to go through the mapping symbols to determine what to
6196 // scan. There are two reasons. First, we should look at THUMB code and
6197 // THUMB code only. Second, we only want to look at the 4K-page boundary
6198 // to speed up the scanning.
6200 while (p != this->mapping_symbols_info_.end()
6201 && p->first.first == shndx)
6203 typename Mapping_symbols_info::const_iterator next =
6204 this->mapping_symbols_info_.upper_bound(p->first);
6206 // Only scan part of a section with THUMB code.
6207 if (p->second == 't')
6209 // Determine the end of this range.
6210 section_size_type span_start =
6211 convert_to_section_size_type(p->first.second);
6212 section_size_type span_end;
6213 if (next != this->mapping_symbols_info_.end()
6214 && next->first.first == shndx)
6215 span_end = convert_to_section_size_type(next->first.second);
6217 span_end = convert_to_section_size_type(shdr.get_sh_size());
6219 if (((span_start + output_address) & ~0xfffUL)
6220 != ((span_end + output_address - 1) & ~0xfffUL))
6222 arm_target->scan_span_for_cortex_a8_erratum(this, shndx,
6223 span_start, span_end,
6233 // Scan relocations for stub generation.
6235 template<bool big_endian>
6237 Arm_relobj<big_endian>::scan_sections_for_stubs(
6238 Target_arm<big_endian>* arm_target,
6239 const Symbol_table* symtab,
6240 const Layout* layout)
6242 unsigned int shnum = this->shnum();
6243 const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6245 // Read the section headers.
6246 const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
6250 // To speed up processing, we set up hash tables for fast lookup of
6251 // input offsets to output addresses.
6252 this->initialize_input_to_output_maps();
6254 const Relobj::Output_sections& out_sections(this->output_sections());
6256 Relocate_info<32, big_endian> relinfo;
6257 relinfo.symtab = symtab;
6258 relinfo.layout = layout;
6259 relinfo.object = this;
6261 // Do relocation stubs scanning.
6262 const unsigned char* p = pshdrs + shdr_size;
6263 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
6265 const elfcpp::Shdr<32, big_endian> shdr(p);
6266 if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab,
6269 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
6270 Arm_address output_offset = this->get_output_section_offset(index);
6271 Arm_address output_address;
6272 if (output_offset != invalid_address)
6273 output_address = out_sections[index]->address() + output_offset;
6276 // Currently this only happens for a relaxed section.
6277 const Output_relaxed_input_section* poris =
6278 out_sections[index]->find_relaxed_input_section(this, index);
6279 gold_assert(poris != NULL);
6280 output_address = poris->address();
6283 // Get the relocations.
6284 const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
6288 // Get the section contents. This does work for the case in which
6289 // we modify the contents of an input section. We need to pass the
6290 // output view under such circumstances.
6291 section_size_type input_view_size = 0;
6292 const unsigned char* input_view =
6293 this->section_contents(index, &input_view_size, false);
6295 relinfo.reloc_shndx = i;
6296 relinfo.data_shndx = index;
6297 unsigned int sh_type = shdr.get_sh_type();
6298 unsigned int reloc_size;
6299 if (sh_type == elfcpp::SHT_REL)
6300 reloc_size = elfcpp::Elf_sizes<32>::rel_size;
6302 reloc_size = elfcpp::Elf_sizes<32>::rela_size;
6304 Output_section* os = out_sections[index];
6305 arm_target->scan_section_for_stubs(&relinfo, sh_type, prelocs,
6306 shdr.get_sh_size() / reloc_size,
6308 output_offset == invalid_address,
6309 input_view, output_address,
6314 // Do Cortex-A8 erratum stubs scanning. This has to be done for a section
6315 // after its relocation section, if there is one, is processed for
6316 // relocation stubs. Merging this loop with the one above would have been
6317 // complicated since we would have had to make sure that relocation stub
6318 // scanning is done first.
6319 if (arm_target->fix_cortex_a8())
6321 const unsigned char* p = pshdrs + shdr_size;
6322 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
6324 const elfcpp::Shdr<32, big_endian> shdr(p);
6325 if (this->section_needs_cortex_a8_stub_scanning(shdr, i,
6328 this->scan_section_for_cortex_a8_erratum(shdr, i, out_sections[i],
6333 // After we've done the relocations, we release the hash tables,
6334 // since we no longer need them.
6335 this->free_input_to_output_maps();
6338 // Count the local symbols. The ARM backend needs to know if a symbol
6339 // is a THUMB function or not. For global symbols, it is easy because
6340 // the Symbol object keeps the ELF symbol type. For local symbol it is
6341 // harder because we cannot access this information. So we override the
6342 // do_count_local_symbol in parent and scan local symbols to mark
6343 // THUMB functions. This is not the most efficient way but I do not want to
6344 // slow down other ports by calling a per symbol target hook inside
6345 // Sized_relobj_file<size, big_endian>::do_count_local_symbols.
6347 template<bool big_endian>
6349 Arm_relobj<big_endian>::do_count_local_symbols(
6350 Stringpool_template<char>* pool,
6351 Stringpool_template<char>* dynpool)
6353 // We need to fix-up the values of any local symbols whose type are
6356 // Ask parent to count the local symbols.
6357 Sized_relobj_file<32, big_endian>::do_count_local_symbols(pool, dynpool);
6358 const unsigned int loccount = this->local_symbol_count();
6362 // Initialize the thumb function bit-vector.
6363 std::vector<bool> empty_vector(loccount, false);
6364 this->local_symbol_is_thumb_function_.swap(empty_vector);
6366 // Read the symbol table section header.
6367 const unsigned int symtab_shndx = this->symtab_shndx();
6368 elfcpp::Shdr<32, big_endian>
6369 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
6370 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
6372 // Read the local symbols.
6373 const int sym_size =elfcpp::Elf_sizes<32>::sym_size;
6374 gold_assert(loccount == symtabshdr.get_sh_info());
6375 off_t locsize = loccount * sym_size;
6376 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
6377 locsize, true, true);
6379 // For mapping symbol processing, we need to read the symbol names.
6380 unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
6381 if (strtab_shndx >= this->shnum())
6383 this->error(_("invalid symbol table name index: %u"), strtab_shndx);
6387 elfcpp::Shdr<32, big_endian>
6388 strtabshdr(this, this->elf_file()->section_header(strtab_shndx));
6389 if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
6391 this->error(_("symbol table name section has wrong type: %u"),
6392 static_cast<unsigned int>(strtabshdr.get_sh_type()));
6395 const char* pnames =
6396 reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(),
6397 strtabshdr.get_sh_size(),
6400 // Loop over the local symbols and mark any local symbols pointing
6401 // to THUMB functions.
6403 // Skip the first dummy symbol.
6405 typename Sized_relobj_file<32, big_endian>::Local_values* plocal_values =
6406 this->local_values();
6407 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
6409 elfcpp::Sym<32, big_endian> sym(psyms);
6410 elfcpp::STT st_type = sym.get_st_type();
6411 Symbol_value<32>& lv((*plocal_values)[i]);
6412 Arm_address input_value = lv.input_value();
6414 // Check to see if this is a mapping symbol.
6415 const char* sym_name = pnames + sym.get_st_name();
6416 if (Target_arm<big_endian>::is_mapping_symbol_name(sym_name))
6419 unsigned int input_shndx =
6420 this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary);
6421 gold_assert(is_ordinary);
6423 // Strip of LSB in case this is a THUMB symbol.
6424 Mapping_symbol_position msp(input_shndx, input_value & ~1U);
6425 this->mapping_symbols_info_[msp] = sym_name[1];
6428 if (st_type == elfcpp::STT_ARM_TFUNC
6429 || (st_type == elfcpp::STT_FUNC && ((input_value & 1) != 0)))
6431 // This is a THUMB function. Mark this and canonicalize the
6432 // symbol value by setting LSB.
6433 this->local_symbol_is_thumb_function_[i] = true;
6434 if ((input_value & 1) == 0)
6435 lv.set_input_value(input_value | 1);
6440 // Relocate sections.
6441 template<bool big_endian>
6443 Arm_relobj<big_endian>::do_relocate_sections(
6444 const Symbol_table* symtab,
6445 const Layout* layout,
6446 const unsigned char* pshdrs,
6448 typename Sized_relobj_file<32, big_endian>::Views* pviews)
6450 // Call parent to relocate sections.
6451 Sized_relobj_file<32, big_endian>::do_relocate_sections(symtab, layout,
6452 pshdrs, of, pviews);
6454 // We do not generate stubs if doing a relocatable link.
6455 if (parameters->options().relocatable())
6458 // Relocate stub tables.
6459 unsigned int shnum = this->shnum();
6461 Target_arm<big_endian>* arm_target =
6462 Target_arm<big_endian>::default_target();
6464 Relocate_info<32, big_endian> relinfo;
6465 relinfo.symtab = symtab;
6466 relinfo.layout = layout;
6467 relinfo.object = this;
6469 for (unsigned int i = 1; i < shnum; ++i)
6471 Arm_input_section<big_endian>* arm_input_section =
6472 arm_target->find_arm_input_section(this, i);
6474 if (arm_input_section != NULL
6475 && arm_input_section->is_stub_table_owner()
6476 && !arm_input_section->stub_table()->empty())
6478 // We cannot discard a section if it owns a stub table.
6479 Output_section* os = this->output_section(i);
6480 gold_assert(os != NULL);
6482 relinfo.reloc_shndx = elfcpp::SHN_UNDEF;
6483 relinfo.reloc_shdr = NULL;
6484 relinfo.data_shndx = i;
6485 relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<32>::shdr_size;
6487 gold_assert((*pviews)[i].view != NULL);
6489 // We are passed the output section view. Adjust it to cover the
6491 Stub_table<big_endian>* stub_table = arm_input_section->stub_table();
6492 gold_assert((stub_table->address() >= (*pviews)[i].address)
6493 && ((stub_table->address() + stub_table->data_size())
6494 <= (*pviews)[i].address + (*pviews)[i].view_size));
6496 off_t offset = stub_table->address() - (*pviews)[i].address;
6497 unsigned char* view = (*pviews)[i].view + offset;
6498 Arm_address address = stub_table->address();
6499 section_size_type view_size = stub_table->data_size();
6501 stub_table->relocate_stubs(&relinfo, arm_target, os, view, address,
6505 // Apply Cortex A8 workaround if applicable.
6506 if (this->section_has_cortex_a8_workaround(i))
6508 unsigned char* view = (*pviews)[i].view;
6509 Arm_address view_address = (*pviews)[i].address;
6510 section_size_type view_size = (*pviews)[i].view_size;
6511 Stub_table<big_endian>* stub_table = this->stub_tables_[i];
6513 // Adjust view to cover section.
6514 Output_section* os = this->output_section(i);
6515 gold_assert(os != NULL);
6516 Arm_address section_address =
6517 this->simple_input_section_output_address(i, os);
6518 uint64_t section_size = this->section_size(i);
6520 gold_assert(section_address >= view_address
6521 && ((section_address + section_size)
6522 <= (view_address + view_size)));
6524 unsigned char* section_view = view + (section_address - view_address);
6526 // Apply the Cortex-A8 workaround to the output address range
6527 // corresponding to this input section.
6528 stub_table->apply_cortex_a8_workaround_to_address_range(
6537 // Find the linked text section of an EXIDX section by looking at the first
6538 // relocation. 4.4.1 of the EHABI specifications says that an EXIDX section
6539 // must be linked to its associated code section via the sh_link field of
6540 // its section header. However, some tools are broken and the link is not
6541 // always set. LD just drops such an EXIDX section silently, causing the
6542 // associated code not unwindabled. Here we try a little bit harder to
6543 // discover the linked code section.
6545 // PSHDR points to the section header of a relocation section of an EXIDX
6546 // section. If we can find a linked text section, return true and
6547 // store the text section index in the location PSHNDX. Otherwise
6550 template<bool big_endian>
6552 Arm_relobj<big_endian>::find_linked_text_section(
6553 const unsigned char* pshdr,
6554 const unsigned char* psyms,
6555 unsigned int* pshndx)
6557 elfcpp::Shdr<32, big_endian> shdr(pshdr);
6559 // If there is no relocation, we cannot find the linked text section.
6561 if (shdr.get_sh_type() == elfcpp::SHT_REL)
6562 reloc_size = elfcpp::Elf_sizes<32>::rel_size;
6564 reloc_size = elfcpp::Elf_sizes<32>::rela_size;
6565 size_t reloc_count = shdr.get_sh_size() / reloc_size;
6567 // Get the relocations.
6568 const unsigned char* prelocs =
6569 this->get_view(shdr.get_sh_offset(), shdr.get_sh_size(), true, false);
6571 // Find the REL31 relocation for the first word of the first EXIDX entry.
6572 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
6574 Arm_address r_offset;
6575 typename elfcpp::Elf_types<32>::Elf_WXword r_info;
6576 if (shdr.get_sh_type() == elfcpp::SHT_REL)
6578 typename elfcpp::Rel<32, big_endian> reloc(prelocs);
6579 r_info = reloc.get_r_info();
6580 r_offset = reloc.get_r_offset();
6584 typename elfcpp::Rela<32, big_endian> reloc(prelocs);
6585 r_info = reloc.get_r_info();
6586 r_offset = reloc.get_r_offset();
6589 unsigned int r_type = elfcpp::elf_r_type<32>(r_info);
6590 if (r_type != elfcpp::R_ARM_PREL31 && r_type != elfcpp::R_ARM_SBREL31)
6593 unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
6595 || r_sym >= this->local_symbol_count()
6599 // This is the relocation for the first word of the first EXIDX entry.
6600 // We expect to see a local section symbol.
6601 const int sym_size = elfcpp::Elf_sizes<32>::sym_size;
6602 elfcpp::Sym<32, big_endian> sym(psyms + r_sym * sym_size);
6603 if (sym.get_st_type() == elfcpp::STT_SECTION)
6607 this->adjust_sym_shndx(r_sym, sym.get_st_shndx(), &is_ordinary);
6608 gold_assert(is_ordinary);
6618 // Make an EXIDX input section object for an EXIDX section whose index is
6619 // SHNDX. SHDR is the section header of the EXIDX section and TEXT_SHNDX
6620 // is the section index of the linked text section.
6622 template<bool big_endian>
6624 Arm_relobj<big_endian>::make_exidx_input_section(
6626 const elfcpp::Shdr<32, big_endian>& shdr,
6627 unsigned int text_shndx,
6628 const elfcpp::Shdr<32, big_endian>& text_shdr)
6630 // Create an Arm_exidx_input_section object for this EXIDX section.
6631 Arm_exidx_input_section* exidx_input_section =
6632 new Arm_exidx_input_section(this, shndx, text_shndx, shdr.get_sh_size(),
6633 shdr.get_sh_addralign(),
6634 text_shdr.get_sh_size());
6636 gold_assert(this->exidx_section_map_[shndx] == NULL);
6637 this->exidx_section_map_[shndx] = exidx_input_section;
6639 if (text_shndx == elfcpp::SHN_UNDEF || text_shndx >= this->shnum())
6641 gold_error(_("EXIDX section %s(%u) links to invalid section %u in %s"),
6642 this->section_name(shndx).c_str(), shndx, text_shndx,
6643 this->name().c_str());
6644 exidx_input_section->set_has_errors();
6646 else if (this->exidx_section_map_[text_shndx] != NULL)
6648 unsigned other_exidx_shndx =
6649 this->exidx_section_map_[text_shndx]->shndx();
6650 gold_error(_("EXIDX sections %s(%u) and %s(%u) both link to text section"
6652 this->section_name(shndx).c_str(), shndx,
6653 this->section_name(other_exidx_shndx).c_str(),
6654 other_exidx_shndx, this->section_name(text_shndx).c_str(),
6655 text_shndx, this->name().c_str());
6656 exidx_input_section->set_has_errors();
6659 this->exidx_section_map_[text_shndx] = exidx_input_section;
6661 // Check section flags of text section.
6662 if ((text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
6664 gold_error(_("EXIDX section %s(%u) links to non-allocated section %s(%u) "
6666 this->section_name(shndx).c_str(), shndx,
6667 this->section_name(text_shndx).c_str(), text_shndx,
6668 this->name().c_str());
6669 exidx_input_section->set_has_errors();
6671 else if ((text_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) == 0)
6672 // I would like to make this an error but currently ld just ignores
6674 gold_warning(_("EXIDX section %s(%u) links to non-executable section "
6676 this->section_name(shndx).c_str(), shndx,
6677 this->section_name(text_shndx).c_str(), text_shndx,
6678 this->name().c_str());
6681 // Read the symbol information.
6683 template<bool big_endian>
6685 Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd)
6687 // Call parent class to read symbol information.
6688 Sized_relobj_file<32, big_endian>::do_read_symbols(sd);
6690 // If this input file is a binary file, it has no processor
6691 // specific flags and attributes section.
6692 Input_file::Format format = this->input_file()->format();
6693 if (format != Input_file::FORMAT_ELF)
6695 gold_assert(format == Input_file::FORMAT_BINARY);
6696 this->merge_flags_and_attributes_ = false;
6700 // Read processor-specific flags in ELF file header.
6701 const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset,
6702 elfcpp::Elf_sizes<32>::ehdr_size,
6704 elfcpp::Ehdr<32, big_endian> ehdr(pehdr);
6705 this->processor_specific_flags_ = ehdr.get_e_flags();
6707 // Go over the section headers and look for .ARM.attributes and .ARM.exidx
6709 std::vector<unsigned int> deferred_exidx_sections;
6710 const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6711 const unsigned char* pshdrs = sd->section_headers->data();
6712 const unsigned char* ps = pshdrs + shdr_size;
6713 bool must_merge_flags_and_attributes = false;
6714 for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size)
6716 elfcpp::Shdr<32, big_endian> shdr(ps);
6718 // Sometimes an object has no contents except the section name string
6719 // table and an empty symbol table with the undefined symbol. We
6720 // don't want to merge processor-specific flags from such an object.
6721 if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
6723 // Symbol table is not empty.
6724 const elfcpp::Elf_types<32>::Elf_WXword sym_size =
6725 elfcpp::Elf_sizes<32>::sym_size;
6726 if (shdr.get_sh_size() > sym_size)
6727 must_merge_flags_and_attributes = true;
6729 else if (shdr.get_sh_type() != elfcpp::SHT_STRTAB)
6730 // If this is neither an empty symbol table nor a string table,
6732 must_merge_flags_and_attributes = true;
6734 if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES)
6736 gold_assert(this->attributes_section_data_ == NULL);
6737 section_offset_type section_offset = shdr.get_sh_offset();
6738 section_size_type section_size =
6739 convert_to_section_size_type(shdr.get_sh_size());
6740 const unsigned char* view =
6741 this->get_view(section_offset, section_size, true, false);
6742 this->attributes_section_data_ =
6743 new Attributes_section_data(view, section_size);
6745 else if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX)
6747 unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link());
6748 if (text_shndx == elfcpp::SHN_UNDEF)
6749 deferred_exidx_sections.push_back(i);
6752 elfcpp::Shdr<32, big_endian> text_shdr(pshdrs
6753 + text_shndx * shdr_size);
6754 this->make_exidx_input_section(i, shdr, text_shndx, text_shdr);
6756 // EHABI 4.4.1 requires that SHF_LINK_ORDER flag to be set.
6757 if ((shdr.get_sh_flags() & elfcpp::SHF_LINK_ORDER) == 0)
6758 gold_warning(_("SHF_LINK_ORDER not set in EXIDX section %s of %s"),
6759 this->section_name(i).c_str(), this->name().c_str());
6764 if (!must_merge_flags_and_attributes)
6766 gold_assert(deferred_exidx_sections.empty());
6767 this->merge_flags_and_attributes_ = false;
6771 // Some tools are broken and they do not set the link of EXIDX sections.
6772 // We look at the first relocation to figure out the linked sections.
6773 if (!deferred_exidx_sections.empty())
6775 // We need to go over the section headers again to find the mapping
6776 // from sections being relocated to their relocation sections. This is
6777 // a bit inefficient as we could do that in the loop above. However,
6778 // we do not expect any deferred EXIDX sections normally. So we do not
6779 // want to slow down the most common path.
6780 typedef Unordered_map<unsigned int, unsigned int> Reloc_map;
6781 Reloc_map reloc_map;
6782 ps = pshdrs + shdr_size;
6783 for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size)
6785 elfcpp::Shdr<32, big_endian> shdr(ps);
6786 elfcpp::Elf_Word sh_type = shdr.get_sh_type();
6787 if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA)
6789 unsigned int info_shndx = this->adjust_shndx(shdr.get_sh_info());
6790 if (info_shndx >= this->shnum())
6791 gold_error(_("relocation section %u has invalid info %u"),
6793 Reloc_map::value_type value(info_shndx, i);
6794 std::pair<Reloc_map::iterator, bool> result =
6795 reloc_map.insert(value);
6797 gold_error(_("section %u has multiple relocation sections "
6799 info_shndx, i, reloc_map[info_shndx]);
6803 // Read the symbol table section header.
6804 const unsigned int symtab_shndx = this->symtab_shndx();
6805 elfcpp::Shdr<32, big_endian>
6806 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
6807 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
6809 // Read the local symbols.
6810 const int sym_size =elfcpp::Elf_sizes<32>::sym_size;
6811 const unsigned int loccount = this->local_symbol_count();
6812 gold_assert(loccount == symtabshdr.get_sh_info());
6813 off_t locsize = loccount * sym_size;
6814 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
6815 locsize, true, true);
6817 // Process the deferred EXIDX sections.
6818 for (unsigned int i = 0; i < deferred_exidx_sections.size(); ++i)
6820 unsigned int shndx = deferred_exidx_sections[i];
6821 elfcpp::Shdr<32, big_endian> shdr(pshdrs + shndx * shdr_size);
6822 unsigned int text_shndx = elfcpp::SHN_UNDEF;
6823 Reloc_map::const_iterator it = reloc_map.find(shndx);
6824 if (it != reloc_map.end())
6825 find_linked_text_section(pshdrs + it->second * shdr_size,
6826 psyms, &text_shndx);
6827 elfcpp::Shdr<32, big_endian> text_shdr(pshdrs
6828 + text_shndx * shdr_size);
6829 this->make_exidx_input_section(shndx, shdr, text_shndx, text_shdr);
6834 // Process relocations for garbage collection. The ARM target uses .ARM.exidx
6835 // sections for unwinding. These sections are referenced implicitly by
6836 // text sections linked in the section headers. If we ignore these implicit
6837 // references, the .ARM.exidx sections and any .ARM.extab sections they use
6838 // will be garbage-collected incorrectly. Hence we override the same function
6839 // in the base class to handle these implicit references.
6841 template<bool big_endian>
6843 Arm_relobj<big_endian>::do_gc_process_relocs(Symbol_table* symtab,
6845 Read_relocs_data* rd)
6847 // First, call base class method to process relocations in this object.
6848 Sized_relobj_file<32, big_endian>::do_gc_process_relocs(symtab, layout, rd);
6850 // If --gc-sections is not specified, there is nothing more to do.
6851 // This happens when --icf is used but --gc-sections is not.
6852 if (!parameters->options().gc_sections())
6855 unsigned int shnum = this->shnum();
6856 const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6857 const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
6861 // Scan section headers for sections of type SHT_ARM_EXIDX. Add references
6862 // to these from the linked text sections.
6863 const unsigned char* ps = pshdrs + shdr_size;
6864 for (unsigned int i = 1; i < shnum; ++i, ps += shdr_size)
6866 elfcpp::Shdr<32, big_endian> shdr(ps);
6867 if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX)
6869 // Found an .ARM.exidx section, add it to the set of reachable
6870 // sections from its linked text section.
6871 unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link());
6872 symtab->gc()->add_reference(this, text_shndx, this, i);
6877 // Update output local symbol count. Owing to EXIDX entry merging, some local
6878 // symbols will be removed in output. Adjust output local symbol count
6879 // accordingly. We can only changed the static output local symbol count. It
6880 // is too late to change the dynamic symbols.
6882 template<bool big_endian>
6884 Arm_relobj<big_endian>::update_output_local_symbol_count()
6886 // Caller should check that this needs updating. We want caller checking
6887 // because output_local_symbol_count_needs_update() is most likely inlined.
6888 gold_assert(this->output_local_symbol_count_needs_update_);
6890 gold_assert(this->symtab_shndx() != -1U);
6891 if (this->symtab_shndx() == 0)
6893 // This object has no symbols. Weird but legal.
6897 // Read the symbol table section header.
6898 const unsigned int symtab_shndx = this->symtab_shndx();
6899 elfcpp::Shdr<32, big_endian>
6900 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
6901 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
6903 // Read the local symbols.
6904 const int sym_size = elfcpp::Elf_sizes<32>::sym_size;
6905 const unsigned int loccount = this->local_symbol_count();
6906 gold_assert(loccount == symtabshdr.get_sh_info());
6907 off_t locsize = loccount * sym_size;
6908 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
6909 locsize, true, true);
6911 // Loop over the local symbols.
6913 typedef typename Sized_relobj_file<32, big_endian>::Output_sections
6915 const Output_sections& out_sections(this->output_sections());
6916 unsigned int shnum = this->shnum();
6917 unsigned int count = 0;
6918 // Skip the first, dummy, symbol.
6920 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
6922 elfcpp::Sym<32, big_endian> sym(psyms);
6924 Symbol_value<32>& lv((*this->local_values())[i]);
6926 // This local symbol was already discarded by do_count_local_symbols.
6927 if (lv.is_output_symtab_index_set() && !lv.has_output_symtab_entry())
6931 unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(),
6936 Output_section* os = out_sections[shndx];
6938 // This local symbol no longer has an output section. Discard it.
6941 lv.set_no_output_symtab_entry();
6945 // Currently we only discard parts of EXIDX input sections.
6946 // We explicitly check for a merged EXIDX input section to avoid
6947 // calling Output_section_data::output_offset unless necessary.
6948 if ((this->get_output_section_offset(shndx) == invalid_address)
6949 && (this->exidx_input_section_by_shndx(shndx) != NULL))
6951 section_offset_type output_offset =
6952 os->output_offset(this, shndx, lv.input_value());
6953 if (output_offset == -1)
6955 // This symbol is defined in a part of an EXIDX input section
6956 // that is discarded due to entry merging.
6957 lv.set_no_output_symtab_entry();
6966 this->set_output_local_symbol_count(count);
6967 this->output_local_symbol_count_needs_update_ = false;
6970 // Arm_dynobj methods.
6972 // Read the symbol information.
6974 template<bool big_endian>
6976 Arm_dynobj<big_endian>::do_read_symbols(Read_symbols_data* sd)
6978 // Call parent class to read symbol information.
6979 Sized_dynobj<32, big_endian>::do_read_symbols(sd);
6981 // Read processor-specific flags in ELF file header.
6982 const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset,
6983 elfcpp::Elf_sizes<32>::ehdr_size,
6985 elfcpp::Ehdr<32, big_endian> ehdr(pehdr);
6986 this->processor_specific_flags_ = ehdr.get_e_flags();
6988 // Read the attributes section if there is one.
6989 // We read from the end because gas seems to put it near the end of
6990 // the section headers.
6991 const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6992 const unsigned char* ps =
6993 sd->section_headers->data() + shdr_size * (this->shnum() - 1);
6994 for (unsigned int i = this->shnum(); i > 0; --i, ps -= shdr_size)
6996 elfcpp::Shdr<32, big_endian> shdr(ps);
6997 if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES)
6999 section_offset_type section_offset = shdr.get_sh_offset();
7000 section_size_type section_size =
7001 convert_to_section_size_type(shdr.get_sh_size());
7002 const unsigned char* view =
7003 this->get_view(section_offset, section_size, true, false);
7004 this->attributes_section_data_ =
7005 new Attributes_section_data(view, section_size);
7011 // Stub_addend_reader methods.
7013 // Read the addend of a REL relocation of type R_TYPE at VIEW.
7015 template<bool big_endian>
7016 elfcpp::Elf_types<32>::Elf_Swxword
7017 Stub_addend_reader<elfcpp::SHT_REL, big_endian>::operator()(
7018 unsigned int r_type,
7019 const unsigned char* view,
7020 const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const
7022 typedef class Arm_relocate_functions<big_endian> RelocFuncs;
7026 case elfcpp::R_ARM_CALL:
7027 case elfcpp::R_ARM_JUMP24:
7028 case elfcpp::R_ARM_PLT32:
7030 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
7031 const Valtype* wv = reinterpret_cast<const Valtype*>(view);
7032 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
7033 return Bits<26>::sign_extend32(val << 2);
7036 case elfcpp::R_ARM_THM_CALL:
7037 case elfcpp::R_ARM_THM_JUMP24:
7038 case elfcpp::R_ARM_THM_XPC22:
7040 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
7041 const Valtype* wv = reinterpret_cast<const Valtype*>(view);
7042 Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
7043 Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
7044 return RelocFuncs::thumb32_branch_offset(upper_insn, lower_insn);
7047 case elfcpp::R_ARM_THM_JUMP19:
7049 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
7050 const Valtype* wv = reinterpret_cast<const Valtype*>(view);
7051 Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
7052 Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
7053 return RelocFuncs::thumb32_cond_branch_offset(upper_insn, lower_insn);
7061 // Arm_output_data_got methods.
7063 // Add a GOT pair for R_ARM_TLS_GD32. The creates a pair of GOT entries.
7064 // The first one is initialized to be 1, which is the module index for
7065 // the main executable and the second one 0. A reloc of the type
7066 // R_ARM_TLS_DTPOFF32 will be created for the second GOT entry and will
7067 // be applied by gold. GSYM is a global symbol.
7069 template<bool big_endian>
7071 Arm_output_data_got<big_endian>::add_tls_gd32_with_static_reloc(
7072 unsigned int got_type,
7075 if (gsym->has_got_offset(got_type))
7078 // We are doing a static link. Just mark it as belong to module 1,
7080 unsigned int got_offset = this->add_constant(1);
7081 gsym->set_got_offset(got_type, got_offset);
7082 got_offset = this->add_constant(0);
7083 this->static_relocs_.push_back(Static_reloc(got_offset,
7084 elfcpp::R_ARM_TLS_DTPOFF32,
7088 // Same as the above but for a local symbol.
7090 template<bool big_endian>
7092 Arm_output_data_got<big_endian>::add_tls_gd32_with_static_reloc(
7093 unsigned int got_type,
7094 Sized_relobj_file<32, big_endian>* object,
7097 if (object->local_has_got_offset(index, got_type))
7100 // We are doing a static link. Just mark it as belong to module 1,
7102 unsigned int got_offset = this->add_constant(1);
7103 object->set_local_got_offset(index, got_type, got_offset);
7104 got_offset = this->add_constant(0);
7105 this->static_relocs_.push_back(Static_reloc(got_offset,
7106 elfcpp::R_ARM_TLS_DTPOFF32,
7110 template<bool big_endian>
7112 Arm_output_data_got<big_endian>::do_write(Output_file* of)
7114 // Call parent to write out GOT.
7115 Output_data_got<32, big_endian>::do_write(of);
7117 // We are done if there is no fix up.
7118 if (this->static_relocs_.empty())
7121 gold_assert(parameters->doing_static_link());
7123 const off_t offset = this->offset();
7124 const section_size_type oview_size =
7125 convert_to_section_size_type(this->data_size());
7126 unsigned char* const oview = of->get_output_view(offset, oview_size);
7128 Output_segment* tls_segment = this->layout_->tls_segment();
7129 gold_assert(tls_segment != NULL);
7131 // The thread pointer $tp points to the TCB, which is followed by the
7132 // TLS. So we need to adjust $tp relative addressing by this amount.
7133 Arm_address aligned_tcb_size =
7134 align_address(ARM_TCB_SIZE, tls_segment->maximum_alignment());
7136 for (size_t i = 0; i < this->static_relocs_.size(); ++i)
7138 Static_reloc& reloc(this->static_relocs_[i]);
7141 if (!reloc.symbol_is_global())
7143 Sized_relobj_file<32, big_endian>* object = reloc.relobj();
7144 const Symbol_value<32>* psymval =
7145 reloc.relobj()->local_symbol(reloc.index());
7147 // We are doing static linking. Issue an error and skip this
7148 // relocation if the symbol is undefined or in a discarded_section.
7150 unsigned int shndx = psymval->input_shndx(&is_ordinary);
7151 if ((shndx == elfcpp::SHN_UNDEF)
7153 && shndx != elfcpp::SHN_UNDEF
7154 && !object->is_section_included(shndx)
7155 && !this->symbol_table_->is_section_folded(object, shndx)))
7157 gold_error(_("undefined or discarded local symbol %u from "
7158 " object %s in GOT"),
7159 reloc.index(), reloc.relobj()->name().c_str());
7163 value = psymval->value(object, 0);
7167 const Symbol* gsym = reloc.symbol();
7168 gold_assert(gsym != NULL);
7169 if (gsym->is_forwarder())
7170 gsym = this->symbol_table_->resolve_forwards(gsym);
7172 // We are doing static linking. Issue an error and skip this
7173 // relocation if the symbol is undefined or in a discarded_section
7174 // unless it is a weakly_undefined symbol.
7175 if ((gsym->is_defined_in_discarded_section()
7176 || gsym->is_undefined())
7177 && !gsym->is_weak_undefined())
7179 gold_error(_("undefined or discarded symbol %s in GOT"),
7184 if (!gsym->is_weak_undefined())
7186 const Sized_symbol<32>* sym =
7187 static_cast<const Sized_symbol<32>*>(gsym);
7188 value = sym->value();
7194 unsigned got_offset = reloc.got_offset();
7195 gold_assert(got_offset < oview_size);
7197 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
7198 Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset);
7200 switch (reloc.r_type())
7202 case elfcpp::R_ARM_TLS_DTPOFF32:
7205 case elfcpp::R_ARM_TLS_TPOFF32:
7206 x = value + aligned_tcb_size;
7211 elfcpp::Swap<32, big_endian>::writeval(wv, x);
7214 of->write_output_view(offset, oview_size, oview);
7217 // A class to handle the PLT data.
7218 // This is an abstract base class that handles most of the linker details
7219 // but does not know the actual contents of PLT entries. The derived
7220 // classes below fill in those details.
7222 template<bool big_endian>
7223 class Output_data_plt_arm : public Output_section_data
7226 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
7229 Output_data_plt_arm(Layout*, uint64_t addralign, Output_data_space*);
7231 // Add an entry to the PLT.
7233 add_entry(Symbol* gsym);
7235 // Return the .rel.plt section data.
7236 const Reloc_section*
7238 { return this->rel_; }
7240 // Return the number of PLT entries.
7243 { return this->count_; }
7245 // Return the offset of the first non-reserved PLT entry.
7247 first_plt_entry_offset() const
7248 { return this->do_first_plt_entry_offset(); }
7250 // Return the size of a PLT entry.
7252 get_plt_entry_size() const
7253 { return this->do_get_plt_entry_size(); }
7256 // Fill in the first PLT entry.
7258 fill_first_plt_entry(unsigned char* pov,
7259 Arm_address got_address,
7260 Arm_address plt_address)
7261 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
7264 fill_plt_entry(unsigned char* pov,
7265 Arm_address got_address,
7266 Arm_address plt_address,
7267 unsigned int got_offset,
7268 unsigned int plt_offset)
7269 { do_fill_plt_entry(pov, got_address, plt_address, got_offset, plt_offset); }
7271 virtual unsigned int
7272 do_first_plt_entry_offset() const = 0;
7274 virtual unsigned int
7275 do_get_plt_entry_size() const = 0;
7278 do_fill_first_plt_entry(unsigned char* pov,
7279 Arm_address got_address,
7280 Arm_address plt_address) = 0;
7283 do_fill_plt_entry(unsigned char* pov,
7284 Arm_address got_address,
7285 Arm_address plt_address,
7286 unsigned int got_offset,
7287 unsigned int plt_offset) = 0;
7290 do_adjust_output_section(Output_section* os);
7292 // Write to a map file.
7294 do_print_to_mapfile(Mapfile* mapfile) const
7295 { mapfile->print_output_data(this, _("** PLT")); }
7298 // Set the final size.
7300 set_final_data_size()
7302 this->set_data_size(this->first_plt_entry_offset()
7303 + this->count_ * this->get_plt_entry_size());
7306 // Write out the PLT data.
7308 do_write(Output_file*);
7310 // The reloc section.
7311 Reloc_section* rel_;
7312 // The .got.plt section.
7313 Output_data_space* got_plt_;
7314 // The number of PLT entries.
7315 unsigned int count_;
7318 // Create the PLT section. The ordinary .got section is an argument,
7319 // since we need to refer to the start. We also create our own .got
7320 // section just for PLT entries.
7322 template<bool big_endian>
7323 Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout,
7325 Output_data_space* got_plt)
7326 : Output_section_data(addralign), got_plt_(got_plt), count_(0)
7328 this->rel_ = new Reloc_section(false);
7329 layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
7330 elfcpp::SHF_ALLOC, this->rel_,
7331 ORDER_DYNAMIC_PLT_RELOCS, false);
7334 template<bool big_endian>
7336 Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os)
7341 // Add an entry to the PLT.
7343 template<bool big_endian>
7345 Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym)
7347 gold_assert(!gsym->has_plt_offset());
7349 // Note that when setting the PLT offset we skip the initial
7350 // reserved PLT entry.
7351 gsym->set_plt_offset((this->count_) * this->get_plt_entry_size()
7352 + this->first_plt_entry_offset());
7356 section_offset_type got_offset = this->got_plt_->current_data_size();
7358 // Every PLT entry needs a GOT entry which points back to the PLT
7359 // entry (this will be changed by the dynamic linker, normally
7360 // lazily when the function is called).
7361 this->got_plt_->set_current_data_size(got_offset + 4);
7363 // Every PLT entry needs a reloc.
7364 gsym->set_needs_dynsym_entry();
7365 this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_,
7368 // Note that we don't need to save the symbol. The contents of the
7369 // PLT are independent of which symbols are used. The symbols only
7370 // appear in the relocations.
7373 template<bool big_endian>
7374 class Output_data_plt_arm_standard : public Output_data_plt_arm<big_endian>
7377 Output_data_plt_arm_standard(Layout* layout, Output_data_space* got_plt)
7378 : Output_data_plt_arm<big_endian>(layout, 4, got_plt)
7382 // Return the offset of the first non-reserved PLT entry.
7383 virtual unsigned int
7384 do_first_plt_entry_offset() const
7385 { return sizeof(first_plt_entry); }
7387 // Return the size of a PLT entry.
7388 virtual unsigned int
7389 do_get_plt_entry_size() const
7390 { return sizeof(plt_entry); }
7393 do_fill_first_plt_entry(unsigned char* pov,
7394 Arm_address got_address,
7395 Arm_address plt_address);
7398 do_fill_plt_entry(unsigned char* pov,
7399 Arm_address got_address,
7400 Arm_address plt_address,
7401 unsigned int got_offset,
7402 unsigned int plt_offset);
7405 // Template for the first PLT entry.
7406 static const uint32_t first_plt_entry[5];
7408 // Template for subsequent PLT entries.
7409 static const uint32_t plt_entry[3];
7413 // FIXME: This is not very flexible. Right now this has only been tested
7414 // on armv5te. If we are to support additional architecture features like
7415 // Thumb-2 or BE8, we need to make this more flexible like GNU ld.
7417 // The first entry in the PLT.
7418 template<bool big_endian>
7419 const uint32_t Output_data_plt_arm_standard<big_endian>::first_plt_entry[5] =
7421 0xe52de004, // str lr, [sp, #-4]!
7422 0xe59fe004, // ldr lr, [pc, #4]
7423 0xe08fe00e, // add lr, pc, lr
7424 0xe5bef008, // ldr pc, [lr, #8]!
7425 0x00000000, // &GOT[0] - .
7428 template<bool big_endian>
7430 Output_data_plt_arm_standard<big_endian>::do_fill_first_plt_entry(
7432 Arm_address got_address,
7433 Arm_address plt_address)
7435 // Write first PLT entry. All but the last word are constants.
7436 const size_t num_first_plt_words = (sizeof(first_plt_entry)
7437 / sizeof(plt_entry[0]));
7438 for (size_t i = 0; i < num_first_plt_words - 1; i++)
7439 elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]);
7440 // Last word in first PLT entry is &GOT[0] - .
7441 elfcpp::Swap<32, big_endian>::writeval(pov + 16,
7442 got_address - (plt_address + 16));
7445 // Subsequent entries in the PLT.
7447 template<bool big_endian>
7448 const uint32_t Output_data_plt_arm_standard<big_endian>::plt_entry[3] =
7450 0xe28fc600, // add ip, pc, #0xNN00000
7451 0xe28cca00, // add ip, ip, #0xNN000
7452 0xe5bcf000, // ldr pc, [ip, #0xNNN]!
7455 template<bool big_endian>
7457 Output_data_plt_arm_standard<big_endian>::do_fill_plt_entry(
7459 Arm_address got_address,
7460 Arm_address plt_address,
7461 unsigned int got_offset,
7462 unsigned int plt_offset)
7464 int32_t offset = ((got_address + got_offset)
7465 - (plt_address + plt_offset + 8));
7467 gold_assert(offset >= 0 && offset < 0x0fffffff);
7468 uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff);
7469 elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0);
7470 uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff);
7471 elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1);
7472 uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff);
7473 elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2);
7476 // Write out the PLT. This uses the hand-coded instructions above,
7477 // and adjusts them as needed. This is all specified by the arm ELF
7478 // Processor Supplement.
7480 template<bool big_endian>
7482 Output_data_plt_arm<big_endian>::do_write(Output_file* of)
7484 const off_t offset = this->offset();
7485 const section_size_type oview_size =
7486 convert_to_section_size_type(this->data_size());
7487 unsigned char* const oview = of->get_output_view(offset, oview_size);
7489 const off_t got_file_offset = this->got_plt_->offset();
7490 const section_size_type got_size =
7491 convert_to_section_size_type(this->got_plt_->data_size());
7492 unsigned char* const got_view = of->get_output_view(got_file_offset,
7494 unsigned char* pov = oview;
7496 Arm_address plt_address = this->address();
7497 Arm_address got_address = this->got_plt_->address();
7499 // Write first PLT entry.
7500 this->fill_first_plt_entry(pov, got_address, plt_address);
7501 pov += this->first_plt_entry_offset();
7503 unsigned char* got_pov = got_view;
7505 memset(got_pov, 0, 12);
7508 unsigned int plt_offset = this->first_plt_entry_offset();
7509 unsigned int got_offset = 12;
7510 const unsigned int count = this->count_;
7511 for (unsigned int i = 0;
7514 pov += this->get_plt_entry_size(),
7516 plt_offset += this->get_plt_entry_size(),
7519 // Set and adjust the PLT entry itself.
7520 this->fill_plt_entry(pov, got_address, plt_address,
7521 got_offset, plt_offset);
7523 // Set the entry in the GOT.
7524 elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address);
7527 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
7528 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
7530 of->write_output_view(offset, oview_size, oview);
7531 of->write_output_view(got_file_offset, got_size, got_view);
7534 // Create a PLT entry for a global symbol.
7536 template<bool big_endian>
7538 Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout,
7541 if (gsym->has_plt_offset())
7544 if (this->plt_ == NULL)
7546 // Create the GOT sections first.
7547 this->got_section(symtab, layout);
7549 this->plt_ = this->make_data_plt(layout, this->got_plt_);
7551 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
7553 | elfcpp::SHF_EXECINSTR),
7554 this->plt_, ORDER_PLT, false);
7556 this->plt_->add_entry(gsym);
7559 // Return the number of entries in the PLT.
7561 template<bool big_endian>
7563 Target_arm<big_endian>::plt_entry_count() const
7565 if (this->plt_ == NULL)
7567 return this->plt_->entry_count();
7570 // Return the offset of the first non-reserved PLT entry.
7572 template<bool big_endian>
7574 Target_arm<big_endian>::first_plt_entry_offset() const
7576 return this->plt_->first_plt_entry_offset();
7579 // Return the size of each PLT entry.
7581 template<bool big_endian>
7583 Target_arm<big_endian>::plt_entry_size() const
7585 return this->plt_->get_plt_entry_size();
7588 // Get the section to use for TLS_DESC relocations.
7590 template<bool big_endian>
7591 typename Target_arm<big_endian>::Reloc_section*
7592 Target_arm<big_endian>::rel_tls_desc_section(Layout* layout) const
7594 return this->plt_section()->rel_tls_desc(layout);
7597 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
7599 template<bool big_endian>
7601 Target_arm<big_endian>::define_tls_base_symbol(
7602 Symbol_table* symtab,
7605 if (this->tls_base_symbol_defined_)
7608 Output_segment* tls_segment = layout->tls_segment();
7609 if (tls_segment != NULL)
7611 bool is_exec = parameters->options().output_is_executable();
7612 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
7613 Symbol_table::PREDEFINED,
7617 elfcpp::STV_HIDDEN, 0,
7619 ? Symbol::SEGMENT_END
7620 : Symbol::SEGMENT_START),
7623 this->tls_base_symbol_defined_ = true;
7626 // Create a GOT entry for the TLS module index.
7628 template<bool big_endian>
7630 Target_arm<big_endian>::got_mod_index_entry(
7631 Symbol_table* symtab,
7633 Sized_relobj_file<32, big_endian>* object)
7635 if (this->got_mod_index_offset_ == -1U)
7637 gold_assert(symtab != NULL && layout != NULL && object != NULL);
7638 Arm_output_data_got<big_endian>* got = this->got_section(symtab, layout);
7639 unsigned int got_offset;
7640 if (!parameters->doing_static_link())
7642 got_offset = got->add_constant(0);
7643 Reloc_section* rel_dyn = this->rel_dyn_section(layout);
7644 rel_dyn->add_local(object, 0, elfcpp::R_ARM_TLS_DTPMOD32, got,
7649 // We are doing a static link. Just mark it as belong to module 1,
7651 got_offset = got->add_constant(1);
7654 got->add_constant(0);
7655 this->got_mod_index_offset_ = got_offset;
7657 return this->got_mod_index_offset_;
7660 // Optimize the TLS relocation type based on what we know about the
7661 // symbol. IS_FINAL is true if the final address of this symbol is
7662 // known at link time.
7664 template<bool big_endian>
7665 tls::Tls_optimization
7666 Target_arm<big_endian>::optimize_tls_reloc(bool, int)
7668 // FIXME: Currently we do not do any TLS optimization.
7669 return tls::TLSOPT_NONE;
7672 // Get the Reference_flags for a particular relocation.
7674 template<bool big_endian>
7676 Target_arm<big_endian>::Scan::get_reference_flags(unsigned int r_type)
7680 case elfcpp::R_ARM_NONE:
7681 case elfcpp::R_ARM_V4BX:
7682 case elfcpp::R_ARM_GNU_VTENTRY:
7683 case elfcpp::R_ARM_GNU_VTINHERIT:
7684 // No symbol reference.
7687 case elfcpp::R_ARM_ABS32:
7688 case elfcpp::R_ARM_ABS16:
7689 case elfcpp::R_ARM_ABS12:
7690 case elfcpp::R_ARM_THM_ABS5:
7691 case elfcpp::R_ARM_ABS8:
7692 case elfcpp::R_ARM_BASE_ABS:
7693 case elfcpp::R_ARM_MOVW_ABS_NC:
7694 case elfcpp::R_ARM_MOVT_ABS:
7695 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
7696 case elfcpp::R_ARM_THM_MOVT_ABS:
7697 case elfcpp::R_ARM_ABS32_NOI:
7698 return Symbol::ABSOLUTE_REF;
7700 case elfcpp::R_ARM_REL32:
7701 case elfcpp::R_ARM_LDR_PC_G0:
7702 case elfcpp::R_ARM_SBREL32:
7703 case elfcpp::R_ARM_THM_PC8:
7704 case elfcpp::R_ARM_BASE_PREL:
7705 case elfcpp::R_ARM_MOVW_PREL_NC:
7706 case elfcpp::R_ARM_MOVT_PREL:
7707 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
7708 case elfcpp::R_ARM_THM_MOVT_PREL:
7709 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
7710 case elfcpp::R_ARM_THM_PC12:
7711 case elfcpp::R_ARM_REL32_NOI:
7712 case elfcpp::R_ARM_ALU_PC_G0_NC:
7713 case elfcpp::R_ARM_ALU_PC_G0:
7714 case elfcpp::R_ARM_ALU_PC_G1_NC:
7715 case elfcpp::R_ARM_ALU_PC_G1:
7716 case elfcpp::R_ARM_ALU_PC_G2:
7717 case elfcpp::R_ARM_LDR_PC_G1:
7718 case elfcpp::R_ARM_LDR_PC_G2:
7719 case elfcpp::R_ARM_LDRS_PC_G0:
7720 case elfcpp::R_ARM_LDRS_PC_G1:
7721 case elfcpp::R_ARM_LDRS_PC_G2:
7722 case elfcpp::R_ARM_LDC_PC_G0:
7723 case elfcpp::R_ARM_LDC_PC_G1:
7724 case elfcpp::R_ARM_LDC_PC_G2:
7725 case elfcpp::R_ARM_ALU_SB_G0_NC:
7726 case elfcpp::R_ARM_ALU_SB_G0:
7727 case elfcpp::R_ARM_ALU_SB_G1_NC:
7728 case elfcpp::R_ARM_ALU_SB_G1:
7729 case elfcpp::R_ARM_ALU_SB_G2:
7730 case elfcpp::R_ARM_LDR_SB_G0:
7731 case elfcpp::R_ARM_LDR_SB_G1:
7732 case elfcpp::R_ARM_LDR_SB_G2:
7733 case elfcpp::R_ARM_LDRS_SB_G0:
7734 case elfcpp::R_ARM_LDRS_SB_G1:
7735 case elfcpp::R_ARM_LDRS_SB_G2:
7736 case elfcpp::R_ARM_LDC_SB_G0:
7737 case elfcpp::R_ARM_LDC_SB_G1:
7738 case elfcpp::R_ARM_LDC_SB_G2:
7739 case elfcpp::R_ARM_MOVW_BREL_NC:
7740 case elfcpp::R_ARM_MOVT_BREL:
7741 case elfcpp::R_ARM_MOVW_BREL:
7742 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
7743 case elfcpp::R_ARM_THM_MOVT_BREL:
7744 case elfcpp::R_ARM_THM_MOVW_BREL:
7745 case elfcpp::R_ARM_GOTOFF32:
7746 case elfcpp::R_ARM_GOTOFF12:
7747 case elfcpp::R_ARM_SBREL31:
7748 return Symbol::RELATIVE_REF;
7750 case elfcpp::R_ARM_PLT32:
7751 case elfcpp::R_ARM_CALL:
7752 case elfcpp::R_ARM_JUMP24:
7753 case elfcpp::R_ARM_THM_CALL:
7754 case elfcpp::R_ARM_THM_JUMP24:
7755 case elfcpp::R_ARM_THM_JUMP19:
7756 case elfcpp::R_ARM_THM_JUMP6:
7757 case elfcpp::R_ARM_THM_JUMP11:
7758 case elfcpp::R_ARM_THM_JUMP8:
7759 // R_ARM_PREL31 is not used to relocate call/jump instructions but
7760 // in unwind tables. It may point to functions via PLTs.
7761 // So we treat it like call/jump relocations above.
7762 case elfcpp::R_ARM_PREL31:
7763 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
7765 case elfcpp::R_ARM_GOT_BREL:
7766 case elfcpp::R_ARM_GOT_ABS:
7767 case elfcpp::R_ARM_GOT_PREL:
7769 return Symbol::ABSOLUTE_REF;
7771 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
7772 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
7773 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
7774 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
7775 case elfcpp::R_ARM_TLS_LE32: // Local-exec
7776 return Symbol::TLS_REF;
7778 case elfcpp::R_ARM_TARGET1:
7779 case elfcpp::R_ARM_TARGET2:
7780 case elfcpp::R_ARM_COPY:
7781 case elfcpp::R_ARM_GLOB_DAT:
7782 case elfcpp::R_ARM_JUMP_SLOT:
7783 case elfcpp::R_ARM_RELATIVE:
7784 case elfcpp::R_ARM_PC24:
7785 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
7786 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
7787 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
7789 // Not expected. We will give an error later.
7794 // Report an unsupported relocation against a local symbol.
7796 template<bool big_endian>
7798 Target_arm<big_endian>::Scan::unsupported_reloc_local(
7799 Sized_relobj_file<32, big_endian>* object,
7800 unsigned int r_type)
7802 gold_error(_("%s: unsupported reloc %u against local symbol"),
7803 object->name().c_str(), r_type);
7806 // We are about to emit a dynamic relocation of type R_TYPE. If the
7807 // dynamic linker does not support it, issue an error. The GNU linker
7808 // only issues a non-PIC error for an allocated read-only section.
7809 // Here we know the section is allocated, but we don't know that it is
7810 // read-only. But we check for all the relocation types which the
7811 // glibc dynamic linker supports, so it seems appropriate to issue an
7812 // error even if the section is not read-only.
7814 template<bool big_endian>
7816 Target_arm<big_endian>::Scan::check_non_pic(Relobj* object,
7817 unsigned int r_type)
7821 // These are the relocation types supported by glibc for ARM.
7822 case elfcpp::R_ARM_RELATIVE:
7823 case elfcpp::R_ARM_COPY:
7824 case elfcpp::R_ARM_GLOB_DAT:
7825 case elfcpp::R_ARM_JUMP_SLOT:
7826 case elfcpp::R_ARM_ABS32:
7827 case elfcpp::R_ARM_ABS32_NOI:
7828 case elfcpp::R_ARM_PC24:
7829 // FIXME: The following 3 types are not supported by Android's dynamic
7831 case elfcpp::R_ARM_TLS_DTPMOD32:
7832 case elfcpp::R_ARM_TLS_DTPOFF32:
7833 case elfcpp::R_ARM_TLS_TPOFF32:
7838 // This prevents us from issuing more than one error per reloc
7839 // section. But we can still wind up issuing more than one
7840 // error per object file.
7841 if (this->issued_non_pic_error_)
7843 const Arm_reloc_property* reloc_property =
7844 arm_reloc_property_table->get_reloc_property(r_type);
7845 gold_assert(reloc_property != NULL);
7846 object->error(_("requires unsupported dynamic reloc %s; "
7847 "recompile with -fPIC"),
7848 reloc_property->name().c_str());
7849 this->issued_non_pic_error_ = true;
7853 case elfcpp::R_ARM_NONE:
7858 // Scan a relocation for a local symbol.
7859 // FIXME: This only handles a subset of relocation types used by Android
7860 // on ARM v5te devices.
7862 template<bool big_endian>
7864 Target_arm<big_endian>::Scan::local(Symbol_table* symtab,
7867 Sized_relobj_file<32, big_endian>* object,
7868 unsigned int data_shndx,
7869 Output_section* output_section,
7870 const elfcpp::Rel<32, big_endian>& reloc,
7871 unsigned int r_type,
7872 const elfcpp::Sym<32, big_endian>& lsym,
7878 r_type = get_real_reloc_type(r_type);
7881 case elfcpp::R_ARM_NONE:
7882 case elfcpp::R_ARM_V4BX:
7883 case elfcpp::R_ARM_GNU_VTENTRY:
7884 case elfcpp::R_ARM_GNU_VTINHERIT:
7887 case elfcpp::R_ARM_ABS32:
7888 case elfcpp::R_ARM_ABS32_NOI:
7889 // If building a shared library (or a position-independent
7890 // executable), we need to create a dynamic relocation for
7891 // this location. The relocation applied at link time will
7892 // apply the link-time value, so we flag the location with
7893 // an R_ARM_RELATIVE relocation so the dynamic loader can
7894 // relocate it easily.
7895 if (parameters->options().output_is_position_independent())
7897 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
7898 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7899 // If we are to add more other reloc types than R_ARM_ABS32,
7900 // we need to add check_non_pic(object, r_type) here.
7901 rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE,
7902 output_section, data_shndx,
7903 reloc.get_r_offset());
7907 case elfcpp::R_ARM_ABS16:
7908 case elfcpp::R_ARM_ABS12:
7909 case elfcpp::R_ARM_THM_ABS5:
7910 case elfcpp::R_ARM_ABS8:
7911 case elfcpp::R_ARM_BASE_ABS:
7912 case elfcpp::R_ARM_MOVW_ABS_NC:
7913 case elfcpp::R_ARM_MOVT_ABS:
7914 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
7915 case elfcpp::R_ARM_THM_MOVT_ABS:
7916 // If building a shared library (or a position-independent
7917 // executable), we need to create a dynamic relocation for
7918 // this location. Because the addend needs to remain in the
7919 // data section, we need to be careful not to apply this
7920 // relocation statically.
7921 if (parameters->options().output_is_position_independent())
7923 check_non_pic(object, r_type);
7924 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
7925 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7926 if (lsym.get_st_type() != elfcpp::STT_SECTION)
7927 rel_dyn->add_local(object, r_sym, r_type, output_section,
7928 data_shndx, reloc.get_r_offset());
7931 gold_assert(lsym.get_st_value() == 0);
7932 unsigned int shndx = lsym.get_st_shndx();
7934 shndx = object->adjust_sym_shndx(r_sym, shndx,
7937 object->error(_("section symbol %u has bad shndx %u"),
7940 rel_dyn->add_local_section(object, shndx,
7941 r_type, output_section,
7942 data_shndx, reloc.get_r_offset());
7947 case elfcpp::R_ARM_REL32:
7948 case elfcpp::R_ARM_LDR_PC_G0:
7949 case elfcpp::R_ARM_SBREL32:
7950 case elfcpp::R_ARM_THM_CALL:
7951 case elfcpp::R_ARM_THM_PC8:
7952 case elfcpp::R_ARM_BASE_PREL:
7953 case elfcpp::R_ARM_PLT32:
7954 case elfcpp::R_ARM_CALL:
7955 case elfcpp::R_ARM_JUMP24:
7956 case elfcpp::R_ARM_THM_JUMP24:
7957 case elfcpp::R_ARM_SBREL31:
7958 case elfcpp::R_ARM_PREL31:
7959 case elfcpp::R_ARM_MOVW_PREL_NC:
7960 case elfcpp::R_ARM_MOVT_PREL:
7961 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
7962 case elfcpp::R_ARM_THM_MOVT_PREL:
7963 case elfcpp::R_ARM_THM_JUMP19:
7964 case elfcpp::R_ARM_THM_JUMP6:
7965 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
7966 case elfcpp::R_ARM_THM_PC12:
7967 case elfcpp::R_ARM_REL32_NOI:
7968 case elfcpp::R_ARM_ALU_PC_G0_NC:
7969 case elfcpp::R_ARM_ALU_PC_G0:
7970 case elfcpp::R_ARM_ALU_PC_G1_NC:
7971 case elfcpp::R_ARM_ALU_PC_G1:
7972 case elfcpp::R_ARM_ALU_PC_G2:
7973 case elfcpp::R_ARM_LDR_PC_G1:
7974 case elfcpp::R_ARM_LDR_PC_G2:
7975 case elfcpp::R_ARM_LDRS_PC_G0:
7976 case elfcpp::R_ARM_LDRS_PC_G1:
7977 case elfcpp::R_ARM_LDRS_PC_G2:
7978 case elfcpp::R_ARM_LDC_PC_G0:
7979 case elfcpp::R_ARM_LDC_PC_G1:
7980 case elfcpp::R_ARM_LDC_PC_G2:
7981 case elfcpp::R_ARM_ALU_SB_G0_NC:
7982 case elfcpp::R_ARM_ALU_SB_G0:
7983 case elfcpp::R_ARM_ALU_SB_G1_NC:
7984 case elfcpp::R_ARM_ALU_SB_G1:
7985 case elfcpp::R_ARM_ALU_SB_G2:
7986 case elfcpp::R_ARM_LDR_SB_G0:
7987 case elfcpp::R_ARM_LDR_SB_G1:
7988 case elfcpp::R_ARM_LDR_SB_G2:
7989 case elfcpp::R_ARM_LDRS_SB_G0:
7990 case elfcpp::R_ARM_LDRS_SB_G1:
7991 case elfcpp::R_ARM_LDRS_SB_G2:
7992 case elfcpp::R_ARM_LDC_SB_G0:
7993 case elfcpp::R_ARM_LDC_SB_G1:
7994 case elfcpp::R_ARM_LDC_SB_G2:
7995 case elfcpp::R_ARM_MOVW_BREL_NC:
7996 case elfcpp::R_ARM_MOVT_BREL:
7997 case elfcpp::R_ARM_MOVW_BREL:
7998 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
7999 case elfcpp::R_ARM_THM_MOVT_BREL:
8000 case elfcpp::R_ARM_THM_MOVW_BREL:
8001 case elfcpp::R_ARM_THM_JUMP11:
8002 case elfcpp::R_ARM_THM_JUMP8:
8003 // We don't need to do anything for a relative addressing relocation
8004 // against a local symbol if it does not reference the GOT.
8007 case elfcpp::R_ARM_GOTOFF32:
8008 case elfcpp::R_ARM_GOTOFF12:
8009 // We need a GOT section:
8010 target->got_section(symtab, layout);
8013 case elfcpp::R_ARM_GOT_BREL:
8014 case elfcpp::R_ARM_GOT_PREL:
8016 // The symbol requires a GOT entry.
8017 Arm_output_data_got<big_endian>* got =
8018 target->got_section(symtab, layout);
8019 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8020 if (got->add_local(object, r_sym, GOT_TYPE_STANDARD))
8022 // If we are generating a shared object, we need to add a
8023 // dynamic RELATIVE relocation for this symbol's GOT entry.
8024 if (parameters->options().output_is_position_independent())
8026 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8027 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8028 rel_dyn->add_local_relative(
8029 object, r_sym, elfcpp::R_ARM_RELATIVE, got,
8030 object->local_got_offset(r_sym, GOT_TYPE_STANDARD));
8036 case elfcpp::R_ARM_TARGET1:
8037 case elfcpp::R_ARM_TARGET2:
8038 // This should have been mapped to another type already.
8040 case elfcpp::R_ARM_COPY:
8041 case elfcpp::R_ARM_GLOB_DAT:
8042 case elfcpp::R_ARM_JUMP_SLOT:
8043 case elfcpp::R_ARM_RELATIVE:
8044 // These are relocations which should only be seen by the
8045 // dynamic linker, and should never be seen here.
8046 gold_error(_("%s: unexpected reloc %u in object file"),
8047 object->name().c_str(), r_type);
8051 // These are initial TLS relocs, which are expected when
8053 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8054 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8055 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8056 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8057 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8059 bool output_is_shared = parameters->options().shared();
8060 const tls::Tls_optimization optimized_type
8061 = Target_arm<big_endian>::optimize_tls_reloc(!output_is_shared,
8065 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8066 if (optimized_type == tls::TLSOPT_NONE)
8068 // Create a pair of GOT entries for the module index and
8069 // dtv-relative offset.
8070 Arm_output_data_got<big_endian>* got
8071 = target->got_section(symtab, layout);
8072 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8073 unsigned int shndx = lsym.get_st_shndx();
8075 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
8078 object->error(_("local symbol %u has bad shndx %u"),
8083 if (!parameters->doing_static_link())
8084 got->add_local_pair_with_rel(object, r_sym, shndx,
8086 target->rel_dyn_section(layout),
8087 elfcpp::R_ARM_TLS_DTPMOD32);
8089 got->add_tls_gd32_with_static_reloc(GOT_TYPE_TLS_PAIR,
8093 // FIXME: TLS optimization not supported yet.
8097 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8098 if (optimized_type == tls::TLSOPT_NONE)
8100 // Create a GOT entry for the module index.
8101 target->got_mod_index_entry(symtab, layout, object);
8104 // FIXME: TLS optimization not supported yet.
8108 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8111 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8112 layout->set_has_static_tls();
8113 if (optimized_type == tls::TLSOPT_NONE)
8115 // Create a GOT entry for the tp-relative offset.
8116 Arm_output_data_got<big_endian>* got
8117 = target->got_section(symtab, layout);
8118 unsigned int r_sym =
8119 elfcpp::elf_r_sym<32>(reloc.get_r_info());
8120 if (!parameters->doing_static_link())
8121 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
8122 target->rel_dyn_section(layout),
8123 elfcpp::R_ARM_TLS_TPOFF32);
8124 else if (!object->local_has_got_offset(r_sym,
8125 GOT_TYPE_TLS_OFFSET))
8127 got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET);
8128 unsigned int got_offset =
8129 object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
8130 got->add_static_reloc(got_offset,
8131 elfcpp::R_ARM_TLS_TPOFF32, object,
8136 // FIXME: TLS optimization not supported yet.
8140 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8141 layout->set_has_static_tls();
8142 if (output_is_shared)
8144 // We need to create a dynamic relocation.
8145 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
8146 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8147 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8148 rel_dyn->add_local(object, r_sym, elfcpp::R_ARM_TLS_TPOFF32,
8149 output_section, data_shndx,
8150 reloc.get_r_offset());
8160 case elfcpp::R_ARM_PC24:
8161 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
8162 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
8163 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
8165 unsupported_reloc_local(object, r_type);
8170 // Report an unsupported relocation against a global symbol.
8172 template<bool big_endian>
8174 Target_arm<big_endian>::Scan::unsupported_reloc_global(
8175 Sized_relobj_file<32, big_endian>* object,
8176 unsigned int r_type,
8179 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
8180 object->name().c_str(), r_type, gsym->demangled_name().c_str());
8183 template<bool big_endian>
8185 Target_arm<big_endian>::Scan::possible_function_pointer_reloc(
8186 unsigned int r_type)
8190 case elfcpp::R_ARM_PC24:
8191 case elfcpp::R_ARM_THM_CALL:
8192 case elfcpp::R_ARM_PLT32:
8193 case elfcpp::R_ARM_CALL:
8194 case elfcpp::R_ARM_JUMP24:
8195 case elfcpp::R_ARM_THM_JUMP24:
8196 case elfcpp::R_ARM_SBREL31:
8197 case elfcpp::R_ARM_PREL31:
8198 case elfcpp::R_ARM_THM_JUMP19:
8199 case elfcpp::R_ARM_THM_JUMP6:
8200 case elfcpp::R_ARM_THM_JUMP11:
8201 case elfcpp::R_ARM_THM_JUMP8:
8202 // All the relocations above are branches except SBREL31 and PREL31.
8206 // Be conservative and assume this is a function pointer.
8211 template<bool big_endian>
8213 Target_arm<big_endian>::Scan::local_reloc_may_be_function_pointer(
8216 Target_arm<big_endian>* target,
8217 Sized_relobj_file<32, big_endian>*,
8220 const elfcpp::Rel<32, big_endian>&,
8221 unsigned int r_type,
8222 const elfcpp::Sym<32, big_endian>&)
8224 r_type = target->get_real_reloc_type(r_type);
8225 return possible_function_pointer_reloc(r_type);
8228 template<bool big_endian>
8230 Target_arm<big_endian>::Scan::global_reloc_may_be_function_pointer(
8233 Target_arm<big_endian>* target,
8234 Sized_relobj_file<32, big_endian>*,
8237 const elfcpp::Rel<32, big_endian>&,
8238 unsigned int r_type,
8241 // GOT is not a function.
8242 if (strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0)
8245 r_type = target->get_real_reloc_type(r_type);
8246 return possible_function_pointer_reloc(r_type);
8249 // Scan a relocation for a global symbol.
8251 template<bool big_endian>
8253 Target_arm<big_endian>::Scan::global(Symbol_table* symtab,
8256 Sized_relobj_file<32, big_endian>* object,
8257 unsigned int data_shndx,
8258 Output_section* output_section,
8259 const elfcpp::Rel<32, big_endian>& reloc,
8260 unsigned int r_type,
8263 // A reference to _GLOBAL_OFFSET_TABLE_ implies that we need a got
8264 // section. We check here to avoid creating a dynamic reloc against
8265 // _GLOBAL_OFFSET_TABLE_.
8266 if (!target->has_got_section()
8267 && strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0)
8268 target->got_section(symtab, layout);
8270 r_type = get_real_reloc_type(r_type);
8273 case elfcpp::R_ARM_NONE:
8274 case elfcpp::R_ARM_V4BX:
8275 case elfcpp::R_ARM_GNU_VTENTRY:
8276 case elfcpp::R_ARM_GNU_VTINHERIT:
8279 case elfcpp::R_ARM_ABS32:
8280 case elfcpp::R_ARM_ABS16:
8281 case elfcpp::R_ARM_ABS12:
8282 case elfcpp::R_ARM_THM_ABS5:
8283 case elfcpp::R_ARM_ABS8:
8284 case elfcpp::R_ARM_BASE_ABS:
8285 case elfcpp::R_ARM_MOVW_ABS_NC:
8286 case elfcpp::R_ARM_MOVT_ABS:
8287 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
8288 case elfcpp::R_ARM_THM_MOVT_ABS:
8289 case elfcpp::R_ARM_ABS32_NOI:
8290 // Absolute addressing relocations.
8292 // Make a PLT entry if necessary.
8293 if (this->symbol_needs_plt_entry(gsym))
8295 target->make_plt_entry(symtab, layout, gsym);
8296 // Since this is not a PC-relative relocation, we may be
8297 // taking the address of a function. In that case we need to
8298 // set the entry in the dynamic symbol table to the address of
8300 if (gsym->is_from_dynobj() && !parameters->options().shared())
8301 gsym->set_needs_dynsym_value();
8303 // Make a dynamic relocation if necessary.
8304 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
8306 if (gsym->may_need_copy_reloc())
8308 target->copy_reloc(symtab, layout, object,
8309 data_shndx, output_section, gsym, reloc);
8311 else if ((r_type == elfcpp::R_ARM_ABS32
8312 || r_type == elfcpp::R_ARM_ABS32_NOI)
8313 && gsym->can_use_relative_reloc(false))
8315 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8316 rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE,
8317 output_section, object,
8318 data_shndx, reloc.get_r_offset());
8322 check_non_pic(object, r_type);
8323 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8324 rel_dyn->add_global(gsym, r_type, output_section, object,
8325 data_shndx, reloc.get_r_offset());
8331 case elfcpp::R_ARM_GOTOFF32:
8332 case elfcpp::R_ARM_GOTOFF12:
8333 // We need a GOT section.
8334 target->got_section(symtab, layout);
8337 case elfcpp::R_ARM_REL32:
8338 case elfcpp::R_ARM_LDR_PC_G0:
8339 case elfcpp::R_ARM_SBREL32:
8340 case elfcpp::R_ARM_THM_PC8:
8341 case elfcpp::R_ARM_BASE_PREL:
8342 case elfcpp::R_ARM_MOVW_PREL_NC:
8343 case elfcpp::R_ARM_MOVT_PREL:
8344 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
8345 case elfcpp::R_ARM_THM_MOVT_PREL:
8346 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
8347 case elfcpp::R_ARM_THM_PC12:
8348 case elfcpp::R_ARM_REL32_NOI:
8349 case elfcpp::R_ARM_ALU_PC_G0_NC:
8350 case elfcpp::R_ARM_ALU_PC_G0:
8351 case elfcpp::R_ARM_ALU_PC_G1_NC:
8352 case elfcpp::R_ARM_ALU_PC_G1:
8353 case elfcpp::R_ARM_ALU_PC_G2:
8354 case elfcpp::R_ARM_LDR_PC_G1:
8355 case elfcpp::R_ARM_LDR_PC_G2:
8356 case elfcpp::R_ARM_LDRS_PC_G0:
8357 case elfcpp::R_ARM_LDRS_PC_G1:
8358 case elfcpp::R_ARM_LDRS_PC_G2:
8359 case elfcpp::R_ARM_LDC_PC_G0:
8360 case elfcpp::R_ARM_LDC_PC_G1:
8361 case elfcpp::R_ARM_LDC_PC_G2:
8362 case elfcpp::R_ARM_ALU_SB_G0_NC:
8363 case elfcpp::R_ARM_ALU_SB_G0:
8364 case elfcpp::R_ARM_ALU_SB_G1_NC:
8365 case elfcpp::R_ARM_ALU_SB_G1:
8366 case elfcpp::R_ARM_ALU_SB_G2:
8367 case elfcpp::R_ARM_LDR_SB_G0:
8368 case elfcpp::R_ARM_LDR_SB_G1:
8369 case elfcpp::R_ARM_LDR_SB_G2:
8370 case elfcpp::R_ARM_LDRS_SB_G0:
8371 case elfcpp::R_ARM_LDRS_SB_G1:
8372 case elfcpp::R_ARM_LDRS_SB_G2:
8373 case elfcpp::R_ARM_LDC_SB_G0:
8374 case elfcpp::R_ARM_LDC_SB_G1:
8375 case elfcpp::R_ARM_LDC_SB_G2:
8376 case elfcpp::R_ARM_MOVW_BREL_NC:
8377 case elfcpp::R_ARM_MOVT_BREL:
8378 case elfcpp::R_ARM_MOVW_BREL:
8379 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
8380 case elfcpp::R_ARM_THM_MOVT_BREL:
8381 case elfcpp::R_ARM_THM_MOVW_BREL:
8382 // Relative addressing relocations.
8384 // Make a dynamic relocation if necessary.
8385 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
8387 if (target->may_need_copy_reloc(gsym))
8389 target->copy_reloc(symtab, layout, object,
8390 data_shndx, output_section, gsym, reloc);
8394 check_non_pic(object, r_type);
8395 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8396 rel_dyn->add_global(gsym, r_type, output_section, object,
8397 data_shndx, reloc.get_r_offset());
8403 case elfcpp::R_ARM_THM_CALL:
8404 case elfcpp::R_ARM_PLT32:
8405 case elfcpp::R_ARM_CALL:
8406 case elfcpp::R_ARM_JUMP24:
8407 case elfcpp::R_ARM_THM_JUMP24:
8408 case elfcpp::R_ARM_SBREL31:
8409 case elfcpp::R_ARM_PREL31:
8410 case elfcpp::R_ARM_THM_JUMP19:
8411 case elfcpp::R_ARM_THM_JUMP6:
8412 case elfcpp::R_ARM_THM_JUMP11:
8413 case elfcpp::R_ARM_THM_JUMP8:
8414 // All the relocation above are branches except for the PREL31 ones.
8415 // A PREL31 relocation can point to a personality function in a shared
8416 // library. In that case we want to use a PLT because we want to
8417 // call the personality routine and the dynamic linkers we care about
8418 // do not support dynamic PREL31 relocations. An REL31 relocation may
8419 // point to a function whose unwinding behaviour is being described but
8420 // we will not mistakenly generate a PLT for that because we should use
8421 // a local section symbol.
8423 // If the symbol is fully resolved, this is just a relative
8424 // local reloc. Otherwise we need a PLT entry.
8425 if (gsym->final_value_is_known())
8427 // If building a shared library, we can also skip the PLT entry
8428 // if the symbol is defined in the output file and is protected
8430 if (gsym->is_defined()
8431 && !gsym->is_from_dynobj()
8432 && !gsym->is_preemptible())
8434 target->make_plt_entry(symtab, layout, gsym);
8437 case elfcpp::R_ARM_GOT_BREL:
8438 case elfcpp::R_ARM_GOT_ABS:
8439 case elfcpp::R_ARM_GOT_PREL:
8441 // The symbol requires a GOT entry.
8442 Arm_output_data_got<big_endian>* got =
8443 target->got_section(symtab, layout);
8444 if (gsym->final_value_is_known())
8445 got->add_global(gsym, GOT_TYPE_STANDARD);
8448 // If this symbol is not fully resolved, we need to add a
8449 // GOT entry with a dynamic relocation.
8450 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8451 if (gsym->is_from_dynobj()
8452 || gsym->is_undefined()
8453 || gsym->is_preemptible()
8454 || (gsym->visibility() == elfcpp::STV_PROTECTED
8455 && parameters->options().shared()))
8456 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
8457 rel_dyn, elfcpp::R_ARM_GLOB_DAT);
8460 if (got->add_global(gsym, GOT_TYPE_STANDARD))
8461 rel_dyn->add_global_relative(
8462 gsym, elfcpp::R_ARM_RELATIVE, got,
8463 gsym->got_offset(GOT_TYPE_STANDARD));
8469 case elfcpp::R_ARM_TARGET1:
8470 case elfcpp::R_ARM_TARGET2:
8471 // These should have been mapped to other types already.
8473 case elfcpp::R_ARM_COPY:
8474 case elfcpp::R_ARM_GLOB_DAT:
8475 case elfcpp::R_ARM_JUMP_SLOT:
8476 case elfcpp::R_ARM_RELATIVE:
8477 // These are relocations which should only be seen by the
8478 // dynamic linker, and should never be seen here.
8479 gold_error(_("%s: unexpected reloc %u in object file"),
8480 object->name().c_str(), r_type);
8483 // These are initial tls relocs, which are expected when
8485 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8486 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8487 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8488 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8489 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8491 const bool is_final = gsym->final_value_is_known();
8492 const tls::Tls_optimization optimized_type
8493 = Target_arm<big_endian>::optimize_tls_reloc(is_final, r_type);
8496 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8497 if (optimized_type == tls::TLSOPT_NONE)
8499 // Create a pair of GOT entries for the module index and
8500 // dtv-relative offset.
8501 Arm_output_data_got<big_endian>* got
8502 = target->got_section(symtab, layout);
8503 if (!parameters->doing_static_link())
8504 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
8505 target->rel_dyn_section(layout),
8506 elfcpp::R_ARM_TLS_DTPMOD32,
8507 elfcpp::R_ARM_TLS_DTPOFF32);
8509 got->add_tls_gd32_with_static_reloc(GOT_TYPE_TLS_PAIR, gsym);
8512 // FIXME: TLS optimization not supported yet.
8516 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8517 if (optimized_type == tls::TLSOPT_NONE)
8519 // Create a GOT entry for the module index.
8520 target->got_mod_index_entry(symtab, layout, object);
8523 // FIXME: TLS optimization not supported yet.
8527 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8530 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8531 layout->set_has_static_tls();
8532 if (optimized_type == tls::TLSOPT_NONE)
8534 // Create a GOT entry for the tp-relative offset.
8535 Arm_output_data_got<big_endian>* got
8536 = target->got_section(symtab, layout);
8537 if (!parameters->doing_static_link())
8538 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
8539 target->rel_dyn_section(layout),
8540 elfcpp::R_ARM_TLS_TPOFF32);
8541 else if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET))
8543 got->add_global(gsym, GOT_TYPE_TLS_OFFSET);
8544 unsigned int got_offset =
8545 gsym->got_offset(GOT_TYPE_TLS_OFFSET);
8546 got->add_static_reloc(got_offset,
8547 elfcpp::R_ARM_TLS_TPOFF32, gsym);
8551 // FIXME: TLS optimization not supported yet.
8555 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8556 layout->set_has_static_tls();
8557 if (parameters->options().shared())
8559 // We need to create a dynamic relocation.
8560 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8561 rel_dyn->add_global(gsym, elfcpp::R_ARM_TLS_TPOFF32,
8562 output_section, object,
8563 data_shndx, reloc.get_r_offset());
8573 case elfcpp::R_ARM_PC24:
8574 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
8575 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
8576 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
8578 unsupported_reloc_global(object, r_type, gsym);
8583 // Process relocations for gc.
8585 template<bool big_endian>
8587 Target_arm<big_endian>::gc_process_relocs(
8588 Symbol_table* symtab,
8590 Sized_relobj_file<32, big_endian>* object,
8591 unsigned int data_shndx,
8593 const unsigned char* prelocs,
8595 Output_section* output_section,
8596 bool needs_special_offset_handling,
8597 size_t local_symbol_count,
8598 const unsigned char* plocal_symbols)
8600 typedef Target_arm<big_endian> Arm;
8601 typedef typename Target_arm<big_endian>::Scan Scan;
8603 gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan,
8604 typename Target_arm::Relocatable_size_for_reloc>(
8613 needs_special_offset_handling,
8618 // Scan relocations for a section.
8620 template<bool big_endian>
8622 Target_arm<big_endian>::scan_relocs(Symbol_table* symtab,
8624 Sized_relobj_file<32, big_endian>* object,
8625 unsigned int data_shndx,
8626 unsigned int sh_type,
8627 const unsigned char* prelocs,
8629 Output_section* output_section,
8630 bool needs_special_offset_handling,
8631 size_t local_symbol_count,
8632 const unsigned char* plocal_symbols)
8634 typedef typename Target_arm<big_endian>::Scan Scan;
8635 if (sh_type == elfcpp::SHT_RELA)
8637 gold_error(_("%s: unsupported RELA reloc section"),
8638 object->name().c_str());
8642 gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>(
8651 needs_special_offset_handling,
8656 // Finalize the sections.
8658 template<bool big_endian>
8660 Target_arm<big_endian>::do_finalize_sections(
8662 const Input_objects* input_objects,
8665 bool merged_any_attributes = false;
8666 // Merge processor-specific flags.
8667 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
8668 p != input_objects->relobj_end();
8671 Arm_relobj<big_endian>* arm_relobj =
8672 Arm_relobj<big_endian>::as_arm_relobj(*p);
8673 if (arm_relobj->merge_flags_and_attributes())
8675 this->merge_processor_specific_flags(
8677 arm_relobj->processor_specific_flags());
8678 this->merge_object_attributes(arm_relobj->name().c_str(),
8679 arm_relobj->attributes_section_data());
8680 merged_any_attributes = true;
8684 for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin();
8685 p != input_objects->dynobj_end();
8688 Arm_dynobj<big_endian>* arm_dynobj =
8689 Arm_dynobj<big_endian>::as_arm_dynobj(*p);
8690 this->merge_processor_specific_flags(
8692 arm_dynobj->processor_specific_flags());
8693 this->merge_object_attributes(arm_dynobj->name().c_str(),
8694 arm_dynobj->attributes_section_data());
8695 merged_any_attributes = true;
8698 // Create an empty uninitialized attribute section if we still don't have it
8699 // at this moment. This happens if there is no attributes sections in all
8701 if (this->attributes_section_data_ == NULL)
8702 this->attributes_section_data_ = new Attributes_section_data(NULL, 0);
8704 const Object_attribute* cpu_arch_attr =
8705 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
8706 // Check if we need to use Cortex-A8 workaround.
8707 if (parameters->options().user_set_fix_cortex_a8())
8708 this->fix_cortex_a8_ = parameters->options().fix_cortex_a8();
8711 // If neither --fix-cortex-a8 nor --no-fix-cortex-a8 is used, turn on
8712 // Cortex-A8 erratum workaround for ARMv7-A or ARMv7 with unknown
8714 const Object_attribute* cpu_arch_profile_attr =
8715 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile);
8716 this->fix_cortex_a8_ =
8717 (cpu_arch_attr->int_value() == elfcpp::TAG_CPU_ARCH_V7
8718 && (cpu_arch_profile_attr->int_value() == 'A'
8719 || cpu_arch_profile_attr->int_value() == 0));
8722 // Check if we can use V4BX interworking.
8723 // The V4BX interworking stub contains BX instruction,
8724 // which is not specified for some profiles.
8725 if (this->fix_v4bx() == General_options::FIX_V4BX_INTERWORKING
8726 && !this->may_use_v4t_interworking())
8727 gold_error(_("unable to provide V4BX reloc interworking fix up; "
8728 "the target profile does not support BX instruction"));
8730 // Fill in some more dynamic tags.
8731 const Reloc_section* rel_plt = (this->plt_ == NULL
8733 : this->plt_->rel_plt());
8734 layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt,
8735 this->rel_dyn_, true, false);
8737 // Emit any relocs we saved in an attempt to avoid generating COPY
8739 if (this->copy_relocs_.any_saved_relocs())
8740 this->copy_relocs_.emit(this->rel_dyn_section(layout));
8742 // Handle the .ARM.exidx section.
8743 Output_section* exidx_section = layout->find_output_section(".ARM.exidx");
8745 if (!parameters->options().relocatable())
8747 if (exidx_section != NULL
8748 && exidx_section->type() == elfcpp::SHT_ARM_EXIDX)
8750 // For the ARM target, we need to add a PT_ARM_EXIDX segment for
8751 // the .ARM.exidx section.
8752 if (!layout->script_options()->saw_phdrs_clause())
8754 gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0,
8757 Output_segment* exidx_segment =
8758 layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R);
8759 exidx_segment->add_output_section_to_nonload(exidx_section,
8765 // Create an .ARM.attributes section if we have merged any attributes
8767 if (merged_any_attributes)
8769 Output_attributes_section_data* attributes_section =
8770 new Output_attributes_section_data(*this->attributes_section_data_);
8771 layout->add_output_section_data(".ARM.attributes",
8772 elfcpp::SHT_ARM_ATTRIBUTES, 0,
8773 attributes_section, ORDER_INVALID,
8777 // Fix up links in section EXIDX headers.
8778 for (Layout::Section_list::const_iterator p = layout->section_list().begin();
8779 p != layout->section_list().end();
8781 if ((*p)->type() == elfcpp::SHT_ARM_EXIDX)
8783 Arm_output_section<big_endian>* os =
8784 Arm_output_section<big_endian>::as_arm_output_section(*p);
8785 os->set_exidx_section_link();
8789 // Return whether a direct absolute static relocation needs to be applied.
8790 // In cases where Scan::local() or Scan::global() has created
8791 // a dynamic relocation other than R_ARM_RELATIVE, the addend
8792 // of the relocation is carried in the data, and we must not
8793 // apply the static relocation.
8795 template<bool big_endian>
8797 Target_arm<big_endian>::Relocate::should_apply_static_reloc(
8798 const Sized_symbol<32>* gsym,
8799 unsigned int r_type,
8801 Output_section* output_section)
8803 // If the output section is not allocated, then we didn't call
8804 // scan_relocs, we didn't create a dynamic reloc, and we must apply
8806 if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0)
8809 int ref_flags = Scan::get_reference_flags(r_type);
8811 // For local symbols, we will have created a non-RELATIVE dynamic
8812 // relocation only if (a) the output is position independent,
8813 // (b) the relocation is absolute (not pc- or segment-relative), and
8814 // (c) the relocation is not 32 bits wide.
8816 return !(parameters->options().output_is_position_independent()
8817 && (ref_flags & Symbol::ABSOLUTE_REF)
8820 // For global symbols, we use the same helper routines used in the
8821 // scan pass. If we did not create a dynamic relocation, or if we
8822 // created a RELATIVE dynamic relocation, we should apply the static
8824 bool has_dyn = gsym->needs_dynamic_reloc(ref_flags);
8825 bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF)
8826 && gsym->can_use_relative_reloc(ref_flags
8827 & Symbol::FUNCTION_CALL);
8828 return !has_dyn || is_rel;
8831 // Perform a relocation.
8833 template<bool big_endian>
8835 Target_arm<big_endian>::Relocate::relocate(
8836 const Relocate_info<32, big_endian>* relinfo,
8838 Output_section* output_section,
8840 const elfcpp::Rel<32, big_endian>& rel,
8841 unsigned int r_type,
8842 const Sized_symbol<32>* gsym,
8843 const Symbol_value<32>* psymval,
8844 unsigned char* view,
8845 Arm_address address,
8846 section_size_type view_size)
8851 typedef Arm_relocate_functions<big_endian> Arm_relocate_functions;
8853 r_type = get_real_reloc_type(r_type);
8854 const Arm_reloc_property* reloc_property =
8855 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
8856 if (reloc_property == NULL)
8858 std::string reloc_name =
8859 arm_reloc_property_table->reloc_name_in_error_message(r_type);
8860 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
8861 _("cannot relocate %s in object file"),
8862 reloc_name.c_str());
8866 const Arm_relobj<big_endian>* object =
8867 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
8869 // If the final branch target of a relocation is THUMB instruction, this
8870 // is 1. Otherwise it is 0.
8871 Arm_address thumb_bit = 0;
8872 Symbol_value<32> symval;
8873 bool is_weakly_undefined_without_plt = false;
8874 bool have_got_offset = false;
8875 unsigned int got_offset = 0;
8877 // If the relocation uses the GOT entry of a symbol instead of the symbol
8878 // itself, we don't care about whether the symbol is defined or what kind
8880 if (reloc_property->uses_got_entry())
8882 // Get the GOT offset.
8883 // The GOT pointer points to the end of the GOT section.
8884 // We need to subtract the size of the GOT section to get
8885 // the actual offset to use in the relocation.
8886 // TODO: We should move GOT offset computing code in TLS relocations
8890 case elfcpp::R_ARM_GOT_BREL:
8891 case elfcpp::R_ARM_GOT_PREL:
8894 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
8895 got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
8896 - target->got_size());
8900 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
8901 gold_assert(object->local_has_got_offset(r_sym,
8902 GOT_TYPE_STANDARD));
8903 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
8904 - target->got_size());
8906 have_got_offset = true;
8913 else if (relnum != Target_arm<big_endian>::fake_relnum_for_stubs)
8917 // This is a global symbol. Determine if we use PLT and if the
8918 // final target is THUMB.
8919 if (gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
8921 // This uses a PLT, change the symbol value.
8922 symval.set_output_value(target->plt_section()->address()
8923 + gsym->plt_offset());
8926 else if (gsym->is_weak_undefined())
8928 // This is a weakly undefined symbol and we do not use PLT
8929 // for this relocation. A branch targeting this symbol will
8930 // be converted into an NOP.
8931 is_weakly_undefined_without_plt = true;
8933 else if (gsym->is_undefined() && reloc_property->uses_symbol())
8935 // This relocation uses the symbol value but the symbol is
8936 // undefined. Exit early and have the caller reporting an
8942 // Set thumb bit if symbol:
8943 // -Has type STT_ARM_TFUNC or
8944 // -Has type STT_FUNC, is defined and with LSB in value set.
8946 (((gsym->type() == elfcpp::STT_ARM_TFUNC)
8947 || (gsym->type() == elfcpp::STT_FUNC
8948 && !gsym->is_undefined()
8949 && ((psymval->value(object, 0) & 1) != 0)))
8956 // This is a local symbol. Determine if the final target is THUMB.
8957 // We saved this information when all the local symbols were read.
8958 elfcpp::Elf_types<32>::Elf_WXword r_info = rel.get_r_info();
8959 unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
8960 thumb_bit = object->local_symbol_is_thumb_function(r_sym) ? 1 : 0;
8965 // This is a fake relocation synthesized for a stub. It does not have
8966 // a real symbol. We just look at the LSB of the symbol value to
8967 // determine if the target is THUMB or not.
8968 thumb_bit = ((psymval->value(object, 0) & 1) != 0);
8971 // Strip LSB if this points to a THUMB target.
8973 && reloc_property->uses_thumb_bit()
8974 && ((psymval->value(object, 0) & 1) != 0))
8976 Arm_address stripped_value =
8977 psymval->value(object, 0) & ~static_cast<Arm_address>(1);
8978 symval.set_output_value(stripped_value);
8982 // To look up relocation stubs, we need to pass the symbol table index of
8984 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
8986 // Get the addressing origin of the output segment defining the
8987 // symbol gsym if needed (AAELF 4.6.1.2 Relocation types).
8988 Arm_address sym_origin = 0;
8989 if (reloc_property->uses_symbol_base())
8991 if (r_type == elfcpp::R_ARM_BASE_ABS && gsym == NULL)
8992 // R_ARM_BASE_ABS with the NULL symbol will give the
8993 // absolute address of the GOT origin (GOT_ORG) (see ARM IHI
8994 // 0044C (AAELF): 4.6.1.8 Proxy generating relocations).
8995 sym_origin = target->got_plt_section()->address();
8996 else if (gsym == NULL)
8998 else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT)
8999 sym_origin = gsym->output_segment()->vaddr();
9000 else if (gsym->source() == Symbol::IN_OUTPUT_DATA)
9001 sym_origin = gsym->output_data()->address();
9003 // TODO: Assumes the segment base to be zero for the global symbols
9004 // till the proper support for the segment-base-relative addressing
9005 // will be implemented. This is consistent with GNU ld.
9008 // For relative addressing relocation, find out the relative address base.
9009 Arm_address relative_address_base = 0;
9010 switch(reloc_property->relative_address_base())
9012 case Arm_reloc_property::RAB_NONE:
9013 // Relocations with relative address bases RAB_TLS and RAB_tp are
9014 // handled by relocate_tls. So we do not need to do anything here.
9015 case Arm_reloc_property::RAB_TLS:
9016 case Arm_reloc_property::RAB_tp:
9018 case Arm_reloc_property::RAB_B_S:
9019 relative_address_base = sym_origin;
9021 case Arm_reloc_property::RAB_GOT_ORG:
9022 relative_address_base = target->got_plt_section()->address();
9024 case Arm_reloc_property::RAB_P:
9025 relative_address_base = address;
9027 case Arm_reloc_property::RAB_Pa:
9028 relative_address_base = address & 0xfffffffcU;
9034 typename Arm_relocate_functions::Status reloc_status =
9035 Arm_relocate_functions::STATUS_OKAY;
9036 bool check_overflow = reloc_property->checks_overflow();
9039 case elfcpp::R_ARM_NONE:
9042 case elfcpp::R_ARM_ABS8:
9043 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9044 reloc_status = Arm_relocate_functions::abs8(view, object, psymval);
9047 case elfcpp::R_ARM_ABS12:
9048 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9049 reloc_status = Arm_relocate_functions::abs12(view, object, psymval);
9052 case elfcpp::R_ARM_ABS16:
9053 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9054 reloc_status = Arm_relocate_functions::abs16(view, object, psymval);
9057 case elfcpp::R_ARM_ABS32:
9058 if (should_apply_static_reloc(gsym, r_type, true, output_section))
9059 reloc_status = Arm_relocate_functions::abs32(view, object, psymval,
9063 case elfcpp::R_ARM_ABS32_NOI:
9064 if (should_apply_static_reloc(gsym, r_type, true, output_section))
9065 // No thumb bit for this relocation: (S + A)
9066 reloc_status = Arm_relocate_functions::abs32(view, object, psymval,
9070 case elfcpp::R_ARM_MOVW_ABS_NC:
9071 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9072 reloc_status = Arm_relocate_functions::movw(view, object, psymval,
9077 case elfcpp::R_ARM_MOVT_ABS:
9078 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9079 reloc_status = Arm_relocate_functions::movt(view, object, psymval, 0);
9082 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
9083 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9084 reloc_status = Arm_relocate_functions::thm_movw(view, object, psymval,
9085 0, thumb_bit, false);
9088 case elfcpp::R_ARM_THM_MOVT_ABS:
9089 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9090 reloc_status = Arm_relocate_functions::thm_movt(view, object,
9094 case elfcpp::R_ARM_MOVW_PREL_NC:
9095 case elfcpp::R_ARM_MOVW_BREL_NC:
9096 case elfcpp::R_ARM_MOVW_BREL:
9098 Arm_relocate_functions::movw(view, object, psymval,
9099 relative_address_base, thumb_bit,
9103 case elfcpp::R_ARM_MOVT_PREL:
9104 case elfcpp::R_ARM_MOVT_BREL:
9106 Arm_relocate_functions::movt(view, object, psymval,
9107 relative_address_base);
9110 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
9111 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
9112 case elfcpp::R_ARM_THM_MOVW_BREL:
9114 Arm_relocate_functions::thm_movw(view, object, psymval,
9115 relative_address_base,
9116 thumb_bit, check_overflow);
9119 case elfcpp::R_ARM_THM_MOVT_PREL:
9120 case elfcpp::R_ARM_THM_MOVT_BREL:
9122 Arm_relocate_functions::thm_movt(view, object, psymval,
9123 relative_address_base);
9126 case elfcpp::R_ARM_REL32:
9127 reloc_status = Arm_relocate_functions::rel32(view, object, psymval,
9128 address, thumb_bit);
9131 case elfcpp::R_ARM_THM_ABS5:
9132 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9133 reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval);
9136 // Thumb long branches.
9137 case elfcpp::R_ARM_THM_CALL:
9138 case elfcpp::R_ARM_THM_XPC22:
9139 case elfcpp::R_ARM_THM_JUMP24:
9141 Arm_relocate_functions::thumb_branch_common(
9142 r_type, relinfo, view, gsym, object, r_sym, psymval, address,
9143 thumb_bit, is_weakly_undefined_without_plt);
9146 case elfcpp::R_ARM_GOTOFF32:
9148 Arm_address got_origin;
9149 got_origin = target->got_plt_section()->address();
9150 reloc_status = Arm_relocate_functions::rel32(view, object, psymval,
9151 got_origin, thumb_bit);
9155 case elfcpp::R_ARM_BASE_PREL:
9156 gold_assert(gsym != NULL);
9158 Arm_relocate_functions::base_prel(view, sym_origin, address);
9161 case elfcpp::R_ARM_BASE_ABS:
9162 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9163 reloc_status = Arm_relocate_functions::base_abs(view, sym_origin);
9166 case elfcpp::R_ARM_GOT_BREL:
9167 gold_assert(have_got_offset);
9168 reloc_status = Arm_relocate_functions::got_brel(view, got_offset);
9171 case elfcpp::R_ARM_GOT_PREL:
9172 gold_assert(have_got_offset);
9173 // Get the address origin for GOT PLT, which is allocated right
9174 // after the GOT section, to calculate an absolute address of
9175 // the symbol GOT entry (got_origin + got_offset).
9176 Arm_address got_origin;
9177 got_origin = target->got_plt_section()->address();
9178 reloc_status = Arm_relocate_functions::got_prel(view,
9179 got_origin + got_offset,
9183 case elfcpp::R_ARM_PLT32:
9184 case elfcpp::R_ARM_CALL:
9185 case elfcpp::R_ARM_JUMP24:
9186 case elfcpp::R_ARM_XPC25:
9187 gold_assert(gsym == NULL
9188 || gsym->has_plt_offset()
9189 || gsym->final_value_is_known()
9190 || (gsym->is_defined()
9191 && !gsym->is_from_dynobj()
9192 && !gsym->is_preemptible()));
9194 Arm_relocate_functions::arm_branch_common(
9195 r_type, relinfo, view, gsym, object, r_sym, psymval, address,
9196 thumb_bit, is_weakly_undefined_without_plt);
9199 case elfcpp::R_ARM_THM_JUMP19:
9201 Arm_relocate_functions::thm_jump19(view, object, psymval, address,
9205 case elfcpp::R_ARM_THM_JUMP6:
9207 Arm_relocate_functions::thm_jump6(view, object, psymval, address);
9210 case elfcpp::R_ARM_THM_JUMP8:
9212 Arm_relocate_functions::thm_jump8(view, object, psymval, address);
9215 case elfcpp::R_ARM_THM_JUMP11:
9217 Arm_relocate_functions::thm_jump11(view, object, psymval, address);
9220 case elfcpp::R_ARM_PREL31:
9221 reloc_status = Arm_relocate_functions::prel31(view, object, psymval,
9222 address, thumb_bit);
9225 case elfcpp::R_ARM_V4BX:
9226 if (target->fix_v4bx() > General_options::FIX_V4BX_NONE)
9228 const bool is_v4bx_interworking =
9229 (target->fix_v4bx() == General_options::FIX_V4BX_INTERWORKING);
9231 Arm_relocate_functions::v4bx(relinfo, view, object, address,
9232 is_v4bx_interworking);
9236 case elfcpp::R_ARM_THM_PC8:
9238 Arm_relocate_functions::thm_pc8(view, object, psymval, address);
9241 case elfcpp::R_ARM_THM_PC12:
9243 Arm_relocate_functions::thm_pc12(view, object, psymval, address);
9246 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
9248 Arm_relocate_functions::thm_alu11(view, object, psymval, address,
9252 case elfcpp::R_ARM_ALU_PC_G0_NC:
9253 case elfcpp::R_ARM_ALU_PC_G0:
9254 case elfcpp::R_ARM_ALU_PC_G1_NC:
9255 case elfcpp::R_ARM_ALU_PC_G1:
9256 case elfcpp::R_ARM_ALU_PC_G2:
9257 case elfcpp::R_ARM_ALU_SB_G0_NC:
9258 case elfcpp::R_ARM_ALU_SB_G0:
9259 case elfcpp::R_ARM_ALU_SB_G1_NC:
9260 case elfcpp::R_ARM_ALU_SB_G1:
9261 case elfcpp::R_ARM_ALU_SB_G2:
9263 Arm_relocate_functions::arm_grp_alu(view, object, psymval,
9264 reloc_property->group_index(),
9265 relative_address_base,
9266 thumb_bit, check_overflow);
9269 case elfcpp::R_ARM_LDR_PC_G0:
9270 case elfcpp::R_ARM_LDR_PC_G1:
9271 case elfcpp::R_ARM_LDR_PC_G2:
9272 case elfcpp::R_ARM_LDR_SB_G0:
9273 case elfcpp::R_ARM_LDR_SB_G1:
9274 case elfcpp::R_ARM_LDR_SB_G2:
9276 Arm_relocate_functions::arm_grp_ldr(view, object, psymval,
9277 reloc_property->group_index(),
9278 relative_address_base);
9281 case elfcpp::R_ARM_LDRS_PC_G0:
9282 case elfcpp::R_ARM_LDRS_PC_G1:
9283 case elfcpp::R_ARM_LDRS_PC_G2:
9284 case elfcpp::R_ARM_LDRS_SB_G0:
9285 case elfcpp::R_ARM_LDRS_SB_G1:
9286 case elfcpp::R_ARM_LDRS_SB_G2:
9288 Arm_relocate_functions::arm_grp_ldrs(view, object, psymval,
9289 reloc_property->group_index(),
9290 relative_address_base);
9293 case elfcpp::R_ARM_LDC_PC_G0:
9294 case elfcpp::R_ARM_LDC_PC_G1:
9295 case elfcpp::R_ARM_LDC_PC_G2:
9296 case elfcpp::R_ARM_LDC_SB_G0:
9297 case elfcpp::R_ARM_LDC_SB_G1:
9298 case elfcpp::R_ARM_LDC_SB_G2:
9300 Arm_relocate_functions::arm_grp_ldc(view, object, psymval,
9301 reloc_property->group_index(),
9302 relative_address_base);
9305 // These are initial tls relocs, which are expected when
9307 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
9308 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
9309 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
9310 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
9311 case elfcpp::R_ARM_TLS_LE32: // Local-exec
9313 this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval,
9314 view, address, view_size);
9317 // The known and unknown unsupported and/or deprecated relocations.
9318 case elfcpp::R_ARM_PC24:
9319 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
9320 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
9321 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
9323 // Just silently leave the method. We should get an appropriate error
9324 // message in the scan methods.
9328 // Report any errors.
9329 switch (reloc_status)
9331 case Arm_relocate_functions::STATUS_OKAY:
9333 case Arm_relocate_functions::STATUS_OVERFLOW:
9334 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
9335 _("relocation overflow in %s"),
9336 reloc_property->name().c_str());
9338 case Arm_relocate_functions::STATUS_BAD_RELOC:
9339 gold_error_at_location(
9343 _("unexpected opcode while processing relocation %s"),
9344 reloc_property->name().c_str());
9353 // Perform a TLS relocation.
9355 template<bool big_endian>
9356 inline typename Arm_relocate_functions<big_endian>::Status
9357 Target_arm<big_endian>::Relocate::relocate_tls(
9358 const Relocate_info<32, big_endian>* relinfo,
9359 Target_arm<big_endian>* target,
9361 const elfcpp::Rel<32, big_endian>& rel,
9362 unsigned int r_type,
9363 const Sized_symbol<32>* gsym,
9364 const Symbol_value<32>* psymval,
9365 unsigned char* view,
9366 elfcpp::Elf_types<32>::Elf_Addr address,
9367 section_size_type /*view_size*/ )
9369 typedef Arm_relocate_functions<big_endian> ArmRelocFuncs;
9370 typedef Relocate_functions<32, big_endian> RelocFuncs;
9371 Output_segment* tls_segment = relinfo->layout->tls_segment();
9373 const Sized_relobj_file<32, big_endian>* object = relinfo->object;
9375 elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0);
9377 const bool is_final = (gsym == NULL
9378 ? !parameters->options().shared()
9379 : gsym->final_value_is_known());
9380 const tls::Tls_optimization optimized_type
9381 = Target_arm<big_endian>::optimize_tls_reloc(is_final, r_type);
9384 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
9386 unsigned int got_type = GOT_TYPE_TLS_PAIR;
9387 unsigned int got_offset;
9390 gold_assert(gsym->has_got_offset(got_type));
9391 got_offset = gsym->got_offset(got_type) - target->got_size();
9395 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
9396 gold_assert(object->local_has_got_offset(r_sym, got_type));
9397 got_offset = (object->local_got_offset(r_sym, got_type)
9398 - target->got_size());
9400 if (optimized_type == tls::TLSOPT_NONE)
9402 Arm_address got_entry =
9403 target->got_plt_section()->address() + got_offset;
9405 // Relocate the field with the PC relative offset of the pair of
9407 RelocFuncs::pcrel32_unaligned(view, got_entry, address);
9408 return ArmRelocFuncs::STATUS_OKAY;
9413 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
9414 if (optimized_type == tls::TLSOPT_NONE)
9416 // Relocate the field with the offset of the GOT entry for
9417 // the module index.
9418 unsigned int got_offset;
9419 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
9420 - target->got_size());
9421 Arm_address got_entry =
9422 target->got_plt_section()->address() + got_offset;
9424 // Relocate the field with the PC relative offset of the pair of
9426 RelocFuncs::pcrel32_unaligned(view, got_entry, address);
9427 return ArmRelocFuncs::STATUS_OKAY;
9431 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
9432 RelocFuncs::rel32_unaligned(view, value);
9433 return ArmRelocFuncs::STATUS_OKAY;
9435 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
9436 if (optimized_type == tls::TLSOPT_NONE)
9438 // Relocate the field with the offset of the GOT entry for
9439 // the tp-relative offset of the symbol.
9440 unsigned int got_type = GOT_TYPE_TLS_OFFSET;
9441 unsigned int got_offset;
9444 gold_assert(gsym->has_got_offset(got_type));
9445 got_offset = gsym->got_offset(got_type);
9449 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
9450 gold_assert(object->local_has_got_offset(r_sym, got_type));
9451 got_offset = object->local_got_offset(r_sym, got_type);
9454 // All GOT offsets are relative to the end of the GOT.
9455 got_offset -= target->got_size();
9457 Arm_address got_entry =
9458 target->got_plt_section()->address() + got_offset;
9460 // Relocate the field with the PC relative offset of the GOT entry.
9461 RelocFuncs::pcrel32_unaligned(view, got_entry, address);
9462 return ArmRelocFuncs::STATUS_OKAY;
9466 case elfcpp::R_ARM_TLS_LE32: // Local-exec
9467 // If we're creating a shared library, a dynamic relocation will
9468 // have been created for this location, so do not apply it now.
9469 if (!parameters->options().shared())
9471 gold_assert(tls_segment != NULL);
9473 // $tp points to the TCB, which is followed by the TLS, so we
9474 // need to add TCB size to the offset.
9475 Arm_address aligned_tcb_size =
9476 align_address(ARM_TCB_SIZE, tls_segment->maximum_alignment());
9477 RelocFuncs::rel32_unaligned(view, value + aligned_tcb_size);
9480 return ArmRelocFuncs::STATUS_OKAY;
9486 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
9487 _("unsupported reloc %u"),
9489 return ArmRelocFuncs::STATUS_BAD_RELOC;
9492 // Relocate section data.
9494 template<bool big_endian>
9496 Target_arm<big_endian>::relocate_section(
9497 const Relocate_info<32, big_endian>* relinfo,
9498 unsigned int sh_type,
9499 const unsigned char* prelocs,
9501 Output_section* output_section,
9502 bool needs_special_offset_handling,
9503 unsigned char* view,
9504 Arm_address address,
9505 section_size_type view_size,
9506 const Reloc_symbol_changes* reloc_symbol_changes)
9508 typedef typename Target_arm<big_endian>::Relocate Arm_relocate;
9509 gold_assert(sh_type == elfcpp::SHT_REL);
9511 // See if we are relocating a relaxed input section. If so, the view
9512 // covers the whole output section and we need to adjust accordingly.
9513 if (needs_special_offset_handling)
9515 const Output_relaxed_input_section* poris =
9516 output_section->find_relaxed_input_section(relinfo->object,
9517 relinfo->data_shndx);
9520 Arm_address section_address = poris->address();
9521 section_size_type section_size = poris->data_size();
9523 gold_assert((section_address >= address)
9524 && ((section_address + section_size)
9525 <= (address + view_size)));
9527 off_t offset = section_address - address;
9530 view_size = section_size;
9534 gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL,
9535 Arm_relocate, gold::Default_comdat_behavior>(
9541 needs_special_offset_handling,
9545 reloc_symbol_changes);
9548 // Return the size of a relocation while scanning during a relocatable
9551 template<bool big_endian>
9553 Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
9554 unsigned int r_type,
9557 r_type = get_real_reloc_type(r_type);
9558 const Arm_reloc_property* arp =
9559 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
9564 std::string reloc_name =
9565 arm_reloc_property_table->reloc_name_in_error_message(r_type);
9566 gold_error(_("%s: unexpected %s in object file"),
9567 object->name().c_str(), reloc_name.c_str());
9572 // Scan the relocs during a relocatable link.
9574 template<bool big_endian>
9576 Target_arm<big_endian>::scan_relocatable_relocs(
9577 Symbol_table* symtab,
9579 Sized_relobj_file<32, big_endian>* object,
9580 unsigned int data_shndx,
9581 unsigned int sh_type,
9582 const unsigned char* prelocs,
9584 Output_section* output_section,
9585 bool needs_special_offset_handling,
9586 size_t local_symbol_count,
9587 const unsigned char* plocal_symbols,
9588 Relocatable_relocs* rr)
9590 gold_assert(sh_type == elfcpp::SHT_REL);
9592 typedef Arm_scan_relocatable_relocs<big_endian, elfcpp::SHT_REL,
9593 Relocatable_size_for_reloc> Scan_relocatable_relocs;
9595 gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL,
9596 Scan_relocatable_relocs>(
9604 needs_special_offset_handling,
9610 // Emit relocations for a section.
9612 template<bool big_endian>
9614 Target_arm<big_endian>::relocate_relocs(
9615 const Relocate_info<32, big_endian>* relinfo,
9616 unsigned int sh_type,
9617 const unsigned char* prelocs,
9619 Output_section* output_section,
9620 typename elfcpp::Elf_types<32>::Elf_Off offset_in_output_section,
9621 const Relocatable_relocs* rr,
9622 unsigned char* view,
9623 Arm_address view_address,
9624 section_size_type view_size,
9625 unsigned char* reloc_view,
9626 section_size_type reloc_view_size)
9628 gold_assert(sh_type == elfcpp::SHT_REL);
9630 gold::relocate_relocs<32, big_endian, elfcpp::SHT_REL>(
9635 offset_in_output_section,
9644 // Perform target-specific processing in a relocatable link. This is
9645 // only used if we use the relocation strategy RELOC_SPECIAL.
9647 template<bool big_endian>
9649 Target_arm<big_endian>::relocate_special_relocatable(
9650 const Relocate_info<32, big_endian>* relinfo,
9651 unsigned int sh_type,
9652 const unsigned char* preloc_in,
9654 Output_section* output_section,
9655 typename elfcpp::Elf_types<32>::Elf_Off offset_in_output_section,
9656 unsigned char* view,
9657 elfcpp::Elf_types<32>::Elf_Addr view_address,
9659 unsigned char* preloc_out)
9661 // We can only handle REL type relocation sections.
9662 gold_assert(sh_type == elfcpp::SHT_REL);
9664 typedef typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc Reltype;
9665 typedef typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc_write
9667 const Arm_address invalid_address = static_cast<Arm_address>(0) - 1;
9669 const Arm_relobj<big_endian>* object =
9670 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
9671 const unsigned int local_count = object->local_symbol_count();
9673 Reltype reloc(preloc_in);
9674 Reltype_write reloc_write(preloc_out);
9676 elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info();
9677 const unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
9678 const unsigned int r_type = elfcpp::elf_r_type<32>(r_info);
9680 const Arm_reloc_property* arp =
9681 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
9682 gold_assert(arp != NULL);
9684 // Get the new symbol index.
9685 // We only use RELOC_SPECIAL strategy in local relocations.
9686 gold_assert(r_sym < local_count);
9688 // We are adjusting a section symbol. We need to find
9689 // the symbol table index of the section symbol for
9690 // the output section corresponding to input section
9691 // in which this symbol is defined.
9693 unsigned int shndx = object->local_symbol_input_shndx(r_sym, &is_ordinary);
9694 gold_assert(is_ordinary);
9695 Output_section* os = object->output_section(shndx);
9696 gold_assert(os != NULL);
9697 gold_assert(os->needs_symtab_index());
9698 unsigned int new_symndx = os->symtab_index();
9700 // Get the new offset--the location in the output section where
9701 // this relocation should be applied.
9703 Arm_address offset = reloc.get_r_offset();
9704 Arm_address new_offset;
9705 if (offset_in_output_section != invalid_address)
9706 new_offset = offset + offset_in_output_section;
9709 section_offset_type sot_offset =
9710 convert_types<section_offset_type, Arm_address>(offset);
9711 section_offset_type new_sot_offset =
9712 output_section->output_offset(object, relinfo->data_shndx,
9714 gold_assert(new_sot_offset != -1);
9715 new_offset = new_sot_offset;
9718 // In an object file, r_offset is an offset within the section.
9719 // In an executable or dynamic object, generated by
9720 // --emit-relocs, r_offset is an absolute address.
9721 if (!parameters->options().relocatable())
9723 new_offset += view_address;
9724 if (offset_in_output_section != invalid_address)
9725 new_offset -= offset_in_output_section;
9728 reloc_write.put_r_offset(new_offset);
9729 reloc_write.put_r_info(elfcpp::elf_r_info<32>(new_symndx, r_type));
9731 // Handle the reloc addend.
9732 // The relocation uses a section symbol in the input file.
9733 // We are adjusting it to use a section symbol in the output
9734 // file. The input section symbol refers to some address in
9735 // the input section. We need the relocation in the output
9736 // file to refer to that same address. This adjustment to
9737 // the addend is the same calculation we use for a simple
9738 // absolute relocation for the input section symbol.
9740 const Symbol_value<32>* psymval = object->local_symbol(r_sym);
9742 // Handle THUMB bit.
9743 Symbol_value<32> symval;
9744 Arm_address thumb_bit =
9745 object->local_symbol_is_thumb_function(r_sym) ? 1 : 0;
9747 && arp->uses_thumb_bit()
9748 && ((psymval->value(object, 0) & 1) != 0))
9750 Arm_address stripped_value =
9751 psymval->value(object, 0) & ~static_cast<Arm_address>(1);
9752 symval.set_output_value(stripped_value);
9756 unsigned char* paddend = view + offset;
9757 typename Arm_relocate_functions<big_endian>::Status reloc_status =
9758 Arm_relocate_functions<big_endian>::STATUS_OKAY;
9761 case elfcpp::R_ARM_ABS8:
9762 reloc_status = Arm_relocate_functions<big_endian>::abs8(paddend, object,
9766 case elfcpp::R_ARM_ABS12:
9767 reloc_status = Arm_relocate_functions<big_endian>::abs12(paddend, object,
9771 case elfcpp::R_ARM_ABS16:
9772 reloc_status = Arm_relocate_functions<big_endian>::abs16(paddend, object,
9776 case elfcpp::R_ARM_THM_ABS5:
9777 reloc_status = Arm_relocate_functions<big_endian>::thm_abs5(paddend,
9782 case elfcpp::R_ARM_MOVW_ABS_NC:
9783 case elfcpp::R_ARM_MOVW_PREL_NC:
9784 case elfcpp::R_ARM_MOVW_BREL_NC:
9785 case elfcpp::R_ARM_MOVW_BREL:
9786 reloc_status = Arm_relocate_functions<big_endian>::movw(
9787 paddend, object, psymval, 0, thumb_bit, arp->checks_overflow());
9790 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
9791 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
9792 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
9793 case elfcpp::R_ARM_THM_MOVW_BREL:
9794 reloc_status = Arm_relocate_functions<big_endian>::thm_movw(
9795 paddend, object, psymval, 0, thumb_bit, arp->checks_overflow());
9798 case elfcpp::R_ARM_THM_CALL:
9799 case elfcpp::R_ARM_THM_XPC22:
9800 case elfcpp::R_ARM_THM_JUMP24:
9802 Arm_relocate_functions<big_endian>::thumb_branch_common(
9803 r_type, relinfo, paddend, NULL, object, 0, psymval, 0, thumb_bit,
9807 case elfcpp::R_ARM_PLT32:
9808 case elfcpp::R_ARM_CALL:
9809 case elfcpp::R_ARM_JUMP24:
9810 case elfcpp::R_ARM_XPC25:
9812 Arm_relocate_functions<big_endian>::arm_branch_common(
9813 r_type, relinfo, paddend, NULL, object, 0, psymval, 0, thumb_bit,
9817 case elfcpp::R_ARM_THM_JUMP19:
9819 Arm_relocate_functions<big_endian>::thm_jump19(paddend, object,
9820 psymval, 0, thumb_bit);
9823 case elfcpp::R_ARM_THM_JUMP6:
9825 Arm_relocate_functions<big_endian>::thm_jump6(paddend, object, psymval,
9829 case elfcpp::R_ARM_THM_JUMP8:
9831 Arm_relocate_functions<big_endian>::thm_jump8(paddend, object, psymval,
9835 case elfcpp::R_ARM_THM_JUMP11:
9837 Arm_relocate_functions<big_endian>::thm_jump11(paddend, object, psymval,
9841 case elfcpp::R_ARM_PREL31:
9843 Arm_relocate_functions<big_endian>::prel31(paddend, object, psymval, 0,
9847 case elfcpp::R_ARM_THM_PC8:
9849 Arm_relocate_functions<big_endian>::thm_pc8(paddend, object, psymval,
9853 case elfcpp::R_ARM_THM_PC12:
9855 Arm_relocate_functions<big_endian>::thm_pc12(paddend, object, psymval,
9859 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
9861 Arm_relocate_functions<big_endian>::thm_alu11(paddend, object, psymval,
9865 // These relocation truncate relocation results so we cannot handle them
9866 // in a relocatable link.
9867 case elfcpp::R_ARM_MOVT_ABS:
9868 case elfcpp::R_ARM_THM_MOVT_ABS:
9869 case elfcpp::R_ARM_MOVT_PREL:
9870 case elfcpp::R_ARM_MOVT_BREL:
9871 case elfcpp::R_ARM_THM_MOVT_PREL:
9872 case elfcpp::R_ARM_THM_MOVT_BREL:
9873 case elfcpp::R_ARM_ALU_PC_G0_NC:
9874 case elfcpp::R_ARM_ALU_PC_G0:
9875 case elfcpp::R_ARM_ALU_PC_G1_NC:
9876 case elfcpp::R_ARM_ALU_PC_G1:
9877 case elfcpp::R_ARM_ALU_PC_G2:
9878 case elfcpp::R_ARM_ALU_SB_G0_NC:
9879 case elfcpp::R_ARM_ALU_SB_G0:
9880 case elfcpp::R_ARM_ALU_SB_G1_NC:
9881 case elfcpp::R_ARM_ALU_SB_G1:
9882 case elfcpp::R_ARM_ALU_SB_G2:
9883 case elfcpp::R_ARM_LDR_PC_G0:
9884 case elfcpp::R_ARM_LDR_PC_G1:
9885 case elfcpp::R_ARM_LDR_PC_G2:
9886 case elfcpp::R_ARM_LDR_SB_G0:
9887 case elfcpp::R_ARM_LDR_SB_G1:
9888 case elfcpp::R_ARM_LDR_SB_G2:
9889 case elfcpp::R_ARM_LDRS_PC_G0:
9890 case elfcpp::R_ARM_LDRS_PC_G1:
9891 case elfcpp::R_ARM_LDRS_PC_G2:
9892 case elfcpp::R_ARM_LDRS_SB_G0:
9893 case elfcpp::R_ARM_LDRS_SB_G1:
9894 case elfcpp::R_ARM_LDRS_SB_G2:
9895 case elfcpp::R_ARM_LDC_PC_G0:
9896 case elfcpp::R_ARM_LDC_PC_G1:
9897 case elfcpp::R_ARM_LDC_PC_G2:
9898 case elfcpp::R_ARM_LDC_SB_G0:
9899 case elfcpp::R_ARM_LDC_SB_G1:
9900 case elfcpp::R_ARM_LDC_SB_G2:
9901 gold_error(_("cannot handle %s in a relocatable link"),
9902 arp->name().c_str());
9909 // Report any errors.
9910 switch (reloc_status)
9912 case Arm_relocate_functions<big_endian>::STATUS_OKAY:
9914 case Arm_relocate_functions<big_endian>::STATUS_OVERFLOW:
9915 gold_error_at_location(relinfo, relnum, reloc.get_r_offset(),
9916 _("relocation overflow in %s"),
9917 arp->name().c_str());
9919 case Arm_relocate_functions<big_endian>::STATUS_BAD_RELOC:
9920 gold_error_at_location(relinfo, relnum, reloc.get_r_offset(),
9921 _("unexpected opcode while processing relocation %s"),
9922 arp->name().c_str());
9929 // Return the value to use for a dynamic symbol which requires special
9930 // treatment. This is how we support equality comparisons of function
9931 // pointers across shared library boundaries, as described in the
9932 // processor specific ABI supplement.
9934 template<bool big_endian>
9936 Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const
9938 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
9939 return this->plt_section()->address() + gsym->plt_offset();
9942 // Map platform-specific relocs to real relocs
9944 template<bool big_endian>
9946 Target_arm<big_endian>::get_real_reloc_type(unsigned int r_type)
9950 case elfcpp::R_ARM_TARGET1:
9951 // This is either R_ARM_ABS32 or R_ARM_REL32;
9952 return elfcpp::R_ARM_ABS32;
9954 case elfcpp::R_ARM_TARGET2:
9955 // This can be any reloc type but usually is R_ARM_GOT_PREL
9956 return elfcpp::R_ARM_GOT_PREL;
9963 // Whether if two EABI versions V1 and V2 are compatible.
9965 template<bool big_endian>
9967 Target_arm<big_endian>::are_eabi_versions_compatible(
9968 elfcpp::Elf_Word v1,
9969 elfcpp::Elf_Word v2)
9971 // v4 and v5 are the same spec before and after it was released,
9972 // so allow mixing them.
9973 if ((v1 == elfcpp::EF_ARM_EABI_UNKNOWN || v2 == elfcpp::EF_ARM_EABI_UNKNOWN)
9974 || (v1 == elfcpp::EF_ARM_EABI_VER4 && v2 == elfcpp::EF_ARM_EABI_VER5)
9975 || (v1 == elfcpp::EF_ARM_EABI_VER5 && v2 == elfcpp::EF_ARM_EABI_VER4))
9981 // Combine FLAGS from an input object called NAME and the processor-specific
9982 // flags in the ELF header of the output. Much of this is adapted from the
9983 // processor-specific flags merging code in elf32_arm_merge_private_bfd_data
9984 // in bfd/elf32-arm.c.
9986 template<bool big_endian>
9988 Target_arm<big_endian>::merge_processor_specific_flags(
9989 const std::string& name,
9990 elfcpp::Elf_Word flags)
9992 if (this->are_processor_specific_flags_set())
9994 elfcpp::Elf_Word out_flags = this->processor_specific_flags();
9996 // Nothing to merge if flags equal to those in output.
9997 if (flags == out_flags)
10000 // Complain about various flag mismatches.
10001 elfcpp::Elf_Word version1 = elfcpp::arm_eabi_version(flags);
10002 elfcpp::Elf_Word version2 = elfcpp::arm_eabi_version(out_flags);
10003 if (!this->are_eabi_versions_compatible(version1, version2)
10004 && parameters->options().warn_mismatch())
10005 gold_error(_("Source object %s has EABI version %d but output has "
10006 "EABI version %d."),
10008 (flags & elfcpp::EF_ARM_EABIMASK) >> 24,
10009 (out_flags & elfcpp::EF_ARM_EABIMASK) >> 24);
10013 // If the input is the default architecture and had the default
10014 // flags then do not bother setting the flags for the output
10015 // architecture, instead allow future merges to do this. If no
10016 // future merges ever set these flags then they will retain their
10017 // uninitialised values, which surprise surprise, correspond
10018 // to the default values.
10022 // This is the first time, just copy the flags.
10023 // We only copy the EABI version for now.
10024 this->set_processor_specific_flags(flags & elfcpp::EF_ARM_EABIMASK);
10028 // Adjust ELF file header.
10029 template<bool big_endian>
10031 Target_arm<big_endian>::do_adjust_elf_header(
10032 unsigned char* view,
10035 gold_assert(len == elfcpp::Elf_sizes<32>::ehdr_size);
10037 elfcpp::Ehdr<32, big_endian> ehdr(view);
10038 elfcpp::Elf_Word flags = this->processor_specific_flags();
10039 unsigned char e_ident[elfcpp::EI_NIDENT];
10040 memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT);
10042 if (elfcpp::arm_eabi_version(flags)
10043 == elfcpp::EF_ARM_EABI_UNKNOWN)
10044 e_ident[elfcpp::EI_OSABI] = elfcpp::ELFOSABI_ARM;
10046 e_ident[elfcpp::EI_OSABI] = 0;
10047 e_ident[elfcpp::EI_ABIVERSION] = 0;
10049 // FIXME: Do EF_ARM_BE8 adjustment.
10051 // If we're working in EABI_VER5, set the hard/soft float ABI flags
10053 if (elfcpp::arm_eabi_version(flags) == elfcpp::EF_ARM_EABI_VER5)
10055 elfcpp::Elf_Half type = ehdr.get_e_type();
10056 if (type == elfcpp::ET_EXEC || type == elfcpp::ET_DYN)
10058 Object_attribute* attr = this->get_aeabi_object_attribute(elfcpp::Tag_ABI_VFP_args);
10059 if (attr->int_value())
10060 flags |= elfcpp::EF_ARM_ABI_FLOAT_HARD;
10062 flags |= elfcpp::EF_ARM_ABI_FLOAT_SOFT;
10063 this->set_processor_specific_flags(flags);
10066 elfcpp::Ehdr_write<32, big_endian> oehdr(view);
10067 oehdr.put_e_ident(e_ident);
10070 // do_make_elf_object to override the same function in the base class.
10071 // We need to use a target-specific sub-class of
10072 // Sized_relobj_file<32, big_endian> to store ARM specific information.
10073 // Hence we need to have our own ELF object creation.
10075 template<bool big_endian>
10077 Target_arm<big_endian>::do_make_elf_object(
10078 const std::string& name,
10079 Input_file* input_file,
10080 off_t offset, const elfcpp::Ehdr<32, big_endian>& ehdr)
10082 int et = ehdr.get_e_type();
10083 // ET_EXEC files are valid input for --just-symbols/-R,
10084 // and we treat them as relocatable objects.
10085 if (et == elfcpp::ET_REL
10086 || (et == elfcpp::ET_EXEC && input_file->just_symbols()))
10088 Arm_relobj<big_endian>* obj =
10089 new Arm_relobj<big_endian>(name, input_file, offset, ehdr);
10093 else if (et == elfcpp::ET_DYN)
10095 Sized_dynobj<32, big_endian>* obj =
10096 new Arm_dynobj<big_endian>(name, input_file, offset, ehdr);
10102 gold_error(_("%s: unsupported ELF file type %d"),
10108 // Read the architecture from the Tag_also_compatible_with attribute, if any.
10109 // Returns -1 if no architecture could be read.
10110 // This is adapted from get_secondary_compatible_arch() in bfd/elf32-arm.c.
10112 template<bool big_endian>
10114 Target_arm<big_endian>::get_secondary_compatible_arch(
10115 const Attributes_section_data* pasd)
10117 const Object_attribute* known_attributes =
10118 pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC);
10120 // Note: the tag and its argument below are uleb128 values, though
10121 // currently-defined values fit in one byte for each.
10122 const std::string& sv =
10123 known_attributes[elfcpp::Tag_also_compatible_with].string_value();
10125 && sv.data()[0] == elfcpp::Tag_CPU_arch
10126 && (sv.data()[1] & 128) != 128)
10127 return sv.data()[1];
10129 // This tag is "safely ignorable", so don't complain if it looks funny.
10133 // Set, or unset, the architecture of the Tag_also_compatible_with attribute.
10134 // The tag is removed if ARCH is -1.
10135 // This is adapted from set_secondary_compatible_arch() in bfd/elf32-arm.c.
10137 template<bool big_endian>
10139 Target_arm<big_endian>::set_secondary_compatible_arch(
10140 Attributes_section_data* pasd,
10143 Object_attribute* known_attributes =
10144 pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC);
10148 known_attributes[elfcpp::Tag_also_compatible_with].set_string_value("");
10152 // Note: the tag and its argument below are uleb128 values, though
10153 // currently-defined values fit in one byte for each.
10155 sv[0] = elfcpp::Tag_CPU_arch;
10156 gold_assert(arch != 0);
10160 known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(sv);
10163 // Combine two values for Tag_CPU_arch, taking secondary compatibility tags
10165 // This is adapted from tag_cpu_arch_combine() in bfd/elf32-arm.c.
10167 template<bool big_endian>
10169 Target_arm<big_endian>::tag_cpu_arch_combine(
10172 int* secondary_compat_out,
10174 int secondary_compat)
10176 #define T(X) elfcpp::TAG_CPU_ARCH_##X
10177 static const int v6t2[] =
10179 T(V6T2), // PRE_V4.
10189 static const int v6k[] =
10202 static const int v7[] =
10216 static const int v6_m[] =
10231 static const int v6s_m[] =
10247 static const int v7e_m[] =
10254 T(V7E_M), // V5TEJ.
10261 T(V7E_M), // V6S_M.
10264 static const int v4t_plus_v6_m[] =
10271 T(V5TEJ), // V5TEJ.
10278 T(V6S_M), // V6S_M.
10279 T(V7E_M), // V7E_M.
10280 T(V4T_PLUS_V6_M) // V4T plus V6_M.
10282 static const int* comb[] =
10290 // Pseudo-architecture.
10294 // Check we've not got a higher architecture than we know about.
10296 if (oldtag > elfcpp::MAX_TAG_CPU_ARCH || newtag > elfcpp::MAX_TAG_CPU_ARCH)
10298 gold_error(_("%s: unknown CPU architecture"), name);
10302 // Override old tag if we have a Tag_also_compatible_with on the output.
10304 if ((oldtag == T(V6_M) && *secondary_compat_out == T(V4T))
10305 || (oldtag == T(V4T) && *secondary_compat_out == T(V6_M)))
10306 oldtag = T(V4T_PLUS_V6_M);
10308 // And override the new tag if we have a Tag_also_compatible_with on the
10311 if ((newtag == T(V6_M) && secondary_compat == T(V4T))
10312 || (newtag == T(V4T) && secondary_compat == T(V6_M)))
10313 newtag = T(V4T_PLUS_V6_M);
10315 // Architectures before V6KZ add features monotonically.
10316 int tagh = std::max(oldtag, newtag);
10317 if (tagh <= elfcpp::TAG_CPU_ARCH_V6KZ)
10320 int tagl = std::min(oldtag, newtag);
10321 int result = comb[tagh - T(V6T2)][tagl];
10323 // Use Tag_CPU_arch == V4T and Tag_also_compatible_with (Tag_CPU_arch V6_M)
10324 // as the canonical version.
10325 if (result == T(V4T_PLUS_V6_M))
10328 *secondary_compat_out = T(V6_M);
10331 *secondary_compat_out = -1;
10335 gold_error(_("%s: conflicting CPU architectures %d/%d"),
10336 name, oldtag, newtag);
10344 // Helper to print AEABI enum tag value.
10346 template<bool big_endian>
10348 Target_arm<big_endian>::aeabi_enum_name(unsigned int value)
10350 static const char* aeabi_enum_names[] =
10351 { "", "variable-size", "32-bit", "" };
10352 const size_t aeabi_enum_names_size =
10353 sizeof(aeabi_enum_names) / sizeof(aeabi_enum_names[0]);
10355 if (value < aeabi_enum_names_size)
10356 return std::string(aeabi_enum_names[value]);
10360 sprintf(buffer, "<unknown value %u>", value);
10361 return std::string(buffer);
10365 // Return the string value to store in TAG_CPU_name.
10367 template<bool big_endian>
10369 Target_arm<big_endian>::tag_cpu_name_value(unsigned int value)
10371 static const char* name_table[] = {
10372 // These aren't real CPU names, but we can't guess
10373 // that from the architecture version alone.
10389 const size_t name_table_size = sizeof(name_table) / sizeof(name_table[0]);
10391 if (value < name_table_size)
10392 return std::string(name_table[value]);
10396 sprintf(buffer, "<unknown CPU value %u>", value);
10397 return std::string(buffer);
10401 // Query attributes object to see if integer divide instructions may be
10402 // present in an object.
10404 template<bool big_endian>
10406 Target_arm<big_endian>::attributes_accept_div(int arch, int profile,
10407 const Object_attribute* div_attr)
10409 switch (div_attr->int_value())
10412 // Integer divide allowed if instruction contained in
10414 if (arch == elfcpp::TAG_CPU_ARCH_V7 && (profile == 'R' || profile == 'M'))
10416 else if (arch >= elfcpp::TAG_CPU_ARCH_V7E_M)
10422 // Integer divide explicitly prohibited.
10426 // Unrecognised case - treat as allowing divide everywhere.
10428 // Integer divide allowed in ARM state.
10433 // Query attributes object to see if integer divide instructions are
10434 // forbidden to be in the object. This is not the inverse of
10435 // attributes_accept_div.
10437 template<bool big_endian>
10439 Target_arm<big_endian>::attributes_forbid_div(const Object_attribute* div_attr)
10441 return div_attr->int_value() == 1;
10444 // Merge object attributes from input file called NAME with those of the
10445 // output. The input object attributes are in the object pointed by PASD.
10447 template<bool big_endian>
10449 Target_arm<big_endian>::merge_object_attributes(
10451 const Attributes_section_data* pasd)
10453 // Return if there is no attributes section data.
10457 // If output has no object attributes, just copy.
10458 const int vendor = Object_attribute::OBJ_ATTR_PROC;
10459 if (this->attributes_section_data_ == NULL)
10461 this->attributes_section_data_ = new Attributes_section_data(*pasd);
10462 Object_attribute* out_attr =
10463 this->attributes_section_data_->known_attributes(vendor);
10465 // We do not output objects with Tag_MPextension_use_legacy - we move
10466 // the attribute's value to Tag_MPextension_use. */
10467 if (out_attr[elfcpp::Tag_MPextension_use_legacy].int_value() != 0)
10469 if (out_attr[elfcpp::Tag_MPextension_use].int_value() != 0
10470 && out_attr[elfcpp::Tag_MPextension_use_legacy].int_value()
10471 != out_attr[elfcpp::Tag_MPextension_use].int_value())
10473 gold_error(_("%s has both the current and legacy "
10474 "Tag_MPextension_use attributes"),
10478 out_attr[elfcpp::Tag_MPextension_use] =
10479 out_attr[elfcpp::Tag_MPextension_use_legacy];
10480 out_attr[elfcpp::Tag_MPextension_use_legacy].set_type(0);
10481 out_attr[elfcpp::Tag_MPextension_use_legacy].set_int_value(0);
10487 const Object_attribute* in_attr = pasd->known_attributes(vendor);
10488 Object_attribute* out_attr =
10489 this->attributes_section_data_->known_attributes(vendor);
10491 // This needs to happen before Tag_ABI_FP_number_model is merged. */
10492 if (in_attr[elfcpp::Tag_ABI_VFP_args].int_value()
10493 != out_attr[elfcpp::Tag_ABI_VFP_args].int_value())
10495 // Ignore mismatches if the object doesn't use floating point. */
10496 if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0)
10497 out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value(
10498 in_attr[elfcpp::Tag_ABI_VFP_args].int_value());
10499 else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0
10500 && parameters->options().warn_mismatch())
10501 gold_error(_("%s uses VFP register arguments, output does not"),
10505 for (int i = 4; i < Vendor_object_attributes::NUM_KNOWN_ATTRIBUTES; ++i)
10507 // Merge this attribute with existing attributes.
10510 case elfcpp::Tag_CPU_raw_name:
10511 case elfcpp::Tag_CPU_name:
10512 // These are merged after Tag_CPU_arch.
10515 case elfcpp::Tag_ABI_optimization_goals:
10516 case elfcpp::Tag_ABI_FP_optimization_goals:
10517 // Use the first value seen.
10520 case elfcpp::Tag_CPU_arch:
10522 unsigned int saved_out_attr = out_attr->int_value();
10523 // Merge Tag_CPU_arch and Tag_also_compatible_with.
10524 int secondary_compat =
10525 this->get_secondary_compatible_arch(pasd);
10526 int secondary_compat_out =
10527 this->get_secondary_compatible_arch(
10528 this->attributes_section_data_);
10529 out_attr[i].set_int_value(
10530 tag_cpu_arch_combine(name, out_attr[i].int_value(),
10531 &secondary_compat_out,
10532 in_attr[i].int_value(),
10533 secondary_compat));
10534 this->set_secondary_compatible_arch(this->attributes_section_data_,
10535 secondary_compat_out);
10537 // Merge Tag_CPU_name and Tag_CPU_raw_name.
10538 if (out_attr[i].int_value() == saved_out_attr)
10539 ; // Leave the names alone.
10540 else if (out_attr[i].int_value() == in_attr[i].int_value())
10542 // The output architecture has been changed to match the
10543 // input architecture. Use the input names.
10544 out_attr[elfcpp::Tag_CPU_name].set_string_value(
10545 in_attr[elfcpp::Tag_CPU_name].string_value());
10546 out_attr[elfcpp::Tag_CPU_raw_name].set_string_value(
10547 in_attr[elfcpp::Tag_CPU_raw_name].string_value());
10551 out_attr[elfcpp::Tag_CPU_name].set_string_value("");
10552 out_attr[elfcpp::Tag_CPU_raw_name].set_string_value("");
10555 // If we still don't have a value for Tag_CPU_name,
10556 // make one up now. Tag_CPU_raw_name remains blank.
10557 if (out_attr[elfcpp::Tag_CPU_name].string_value() == "")
10559 const std::string cpu_name =
10560 this->tag_cpu_name_value(out_attr[i].int_value());
10561 // FIXME: If we see an unknown CPU, this will be set
10562 // to "<unknown CPU n>", where n is the attribute value.
10563 // This is different from BFD, which leaves the name alone.
10564 out_attr[elfcpp::Tag_CPU_name].set_string_value(cpu_name);
10569 case elfcpp::Tag_ARM_ISA_use:
10570 case elfcpp::Tag_THUMB_ISA_use:
10571 case elfcpp::Tag_WMMX_arch:
10572 case elfcpp::Tag_Advanced_SIMD_arch:
10573 // ??? Do Advanced_SIMD (NEON) and WMMX conflict?
10574 case elfcpp::Tag_ABI_FP_rounding:
10575 case elfcpp::Tag_ABI_FP_exceptions:
10576 case elfcpp::Tag_ABI_FP_user_exceptions:
10577 case elfcpp::Tag_ABI_FP_number_model:
10578 case elfcpp::Tag_VFP_HP_extension:
10579 case elfcpp::Tag_CPU_unaligned_access:
10580 case elfcpp::Tag_T2EE_use:
10581 case elfcpp::Tag_Virtualization_use:
10582 case elfcpp::Tag_MPextension_use:
10583 // Use the largest value specified.
10584 if (in_attr[i].int_value() > out_attr[i].int_value())
10585 out_attr[i].set_int_value(in_attr[i].int_value());
10588 case elfcpp::Tag_ABI_align8_preserved:
10589 case elfcpp::Tag_ABI_PCS_RO_data:
10590 // Use the smallest value specified.
10591 if (in_attr[i].int_value() < out_attr[i].int_value())
10592 out_attr[i].set_int_value(in_attr[i].int_value());
10595 case elfcpp::Tag_ABI_align8_needed:
10596 if ((in_attr[i].int_value() > 0 || out_attr[i].int_value() > 0)
10597 && (in_attr[elfcpp::Tag_ABI_align8_preserved].int_value() == 0
10598 || (out_attr[elfcpp::Tag_ABI_align8_preserved].int_value()
10601 // This error message should be enabled once all non-conforming
10602 // binaries in the toolchain have had the attributes set
10604 // gold_error(_("output 8-byte data alignment conflicts with %s"),
10608 case elfcpp::Tag_ABI_FP_denormal:
10609 case elfcpp::Tag_ABI_PCS_GOT_use:
10611 // These tags have 0 = don't care, 1 = strong requirement,
10612 // 2 = weak requirement.
10613 static const int order_021[3] = {0, 2, 1};
10615 // Use the "greatest" from the sequence 0, 2, 1, or the largest
10616 // value if greater than 2 (for future-proofing).
10617 if ((in_attr[i].int_value() > 2
10618 && in_attr[i].int_value() > out_attr[i].int_value())
10619 || (in_attr[i].int_value() <= 2
10620 && out_attr[i].int_value() <= 2
10621 && (order_021[in_attr[i].int_value()]
10622 > order_021[out_attr[i].int_value()])))
10623 out_attr[i].set_int_value(in_attr[i].int_value());
10627 case elfcpp::Tag_CPU_arch_profile:
10628 if (out_attr[i].int_value() != in_attr[i].int_value())
10630 // 0 will merge with anything.
10631 // 'A' and 'S' merge to 'A'.
10632 // 'R' and 'S' merge to 'R'.
10633 // 'M' and 'A|R|S' is an error.
10634 if (out_attr[i].int_value() == 0
10635 || (out_attr[i].int_value() == 'S'
10636 && (in_attr[i].int_value() == 'A'
10637 || in_attr[i].int_value() == 'R')))
10638 out_attr[i].set_int_value(in_attr[i].int_value());
10639 else if (in_attr[i].int_value() == 0
10640 || (in_attr[i].int_value() == 'S'
10641 && (out_attr[i].int_value() == 'A'
10642 || out_attr[i].int_value() == 'R')))
10644 else if (parameters->options().warn_mismatch())
10647 (_("conflicting architecture profiles %c/%c"),
10648 in_attr[i].int_value() ? in_attr[i].int_value() : '0',
10649 out_attr[i].int_value() ? out_attr[i].int_value() : '0');
10653 case elfcpp::Tag_VFP_arch:
10655 static const struct
10659 } vfp_versions[7] =
10670 // Values greater than 6 aren't defined, so just pick the
10672 if (in_attr[i].int_value() > 6
10673 && in_attr[i].int_value() > out_attr[i].int_value())
10675 *out_attr = *in_attr;
10678 // The output uses the superset of input features
10679 // (ISA version) and registers.
10680 int ver = std::max(vfp_versions[in_attr[i].int_value()].ver,
10681 vfp_versions[out_attr[i].int_value()].ver);
10682 int regs = std::max(vfp_versions[in_attr[i].int_value()].regs,
10683 vfp_versions[out_attr[i].int_value()].regs);
10684 // This assumes all possible supersets are also a valid
10687 for (newval = 6; newval > 0; newval--)
10689 if (regs == vfp_versions[newval].regs
10690 && ver == vfp_versions[newval].ver)
10693 out_attr[i].set_int_value(newval);
10696 case elfcpp::Tag_PCS_config:
10697 if (out_attr[i].int_value() == 0)
10698 out_attr[i].set_int_value(in_attr[i].int_value());
10699 else if (in_attr[i].int_value() != 0
10700 && out_attr[i].int_value() != 0
10701 && parameters->options().warn_mismatch())
10703 // It's sometimes ok to mix different configs, so this is only
10705 gold_warning(_("%s: conflicting platform configuration"), name);
10708 case elfcpp::Tag_ABI_PCS_R9_use:
10709 if (in_attr[i].int_value() != out_attr[i].int_value()
10710 && out_attr[i].int_value() != elfcpp::AEABI_R9_unused
10711 && in_attr[i].int_value() != elfcpp::AEABI_R9_unused
10712 && parameters->options().warn_mismatch())
10714 gold_error(_("%s: conflicting use of R9"), name);
10716 if (out_attr[i].int_value() == elfcpp::AEABI_R9_unused)
10717 out_attr[i].set_int_value(in_attr[i].int_value());
10719 case elfcpp::Tag_ABI_PCS_RW_data:
10720 if (in_attr[i].int_value() == elfcpp::AEABI_PCS_RW_data_SBrel
10721 && (in_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value()
10722 != elfcpp::AEABI_R9_SB)
10723 && (out_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value()
10724 != elfcpp::AEABI_R9_unused)
10725 && parameters->options().warn_mismatch())
10727 gold_error(_("%s: SB relative addressing conflicts with use "
10731 // Use the smallest value specified.
10732 if (in_attr[i].int_value() < out_attr[i].int_value())
10733 out_attr[i].set_int_value(in_attr[i].int_value());
10735 case elfcpp::Tag_ABI_PCS_wchar_t:
10736 if (out_attr[i].int_value()
10737 && in_attr[i].int_value()
10738 && out_attr[i].int_value() != in_attr[i].int_value()
10739 && parameters->options().warn_mismatch()
10740 && parameters->options().wchar_size_warning())
10742 gold_warning(_("%s uses %u-byte wchar_t yet the output is to "
10743 "use %u-byte wchar_t; use of wchar_t values "
10744 "across objects may fail"),
10745 name, in_attr[i].int_value(),
10746 out_attr[i].int_value());
10748 else if (in_attr[i].int_value() && !out_attr[i].int_value())
10749 out_attr[i].set_int_value(in_attr[i].int_value());
10751 case elfcpp::Tag_ABI_enum_size:
10752 if (in_attr[i].int_value() != elfcpp::AEABI_enum_unused)
10754 if (out_attr[i].int_value() == elfcpp::AEABI_enum_unused
10755 || out_attr[i].int_value() == elfcpp::AEABI_enum_forced_wide)
10757 // The existing object is compatible with anything.
10758 // Use whatever requirements the new object has.
10759 out_attr[i].set_int_value(in_attr[i].int_value());
10761 else if (in_attr[i].int_value() != elfcpp::AEABI_enum_forced_wide
10762 && out_attr[i].int_value() != in_attr[i].int_value()
10763 && parameters->options().warn_mismatch()
10764 && parameters->options().enum_size_warning())
10766 unsigned int in_value = in_attr[i].int_value();
10767 unsigned int out_value = out_attr[i].int_value();
10768 gold_warning(_("%s uses %s enums yet the output is to use "
10769 "%s enums; use of enum values across objects "
10772 this->aeabi_enum_name(in_value).c_str(),
10773 this->aeabi_enum_name(out_value).c_str());
10777 case elfcpp::Tag_ABI_VFP_args:
10780 case elfcpp::Tag_ABI_WMMX_args:
10781 if (in_attr[i].int_value() != out_attr[i].int_value()
10782 && parameters->options().warn_mismatch())
10784 gold_error(_("%s uses iWMMXt register arguments, output does "
10789 case Object_attribute::Tag_compatibility:
10790 // Merged in target-independent code.
10792 case elfcpp::Tag_ABI_HardFP_use:
10793 // 1 (SP) and 2 (DP) conflict, so combine to 3 (SP & DP).
10794 if ((in_attr[i].int_value() == 1 && out_attr[i].int_value() == 2)
10795 || (in_attr[i].int_value() == 2 && out_attr[i].int_value() == 1))
10796 out_attr[i].set_int_value(3);
10797 else if (in_attr[i].int_value() > out_attr[i].int_value())
10798 out_attr[i].set_int_value(in_attr[i].int_value());
10800 case elfcpp::Tag_ABI_FP_16bit_format:
10801 if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0)
10803 if (in_attr[i].int_value() != out_attr[i].int_value()
10804 && parameters->options().warn_mismatch())
10805 gold_error(_("fp16 format mismatch between %s and output"),
10808 if (in_attr[i].int_value() != 0)
10809 out_attr[i].set_int_value(in_attr[i].int_value());
10812 case elfcpp::Tag_DIV_use:
10814 // A value of zero on input means that the divide
10815 // instruction may be used if available in the base
10816 // architecture as specified via Tag_CPU_arch and
10817 // Tag_CPU_arch_profile. A value of 1 means that the user
10818 // did not want divide instructions. A value of 2
10819 // explicitly means that divide instructions were allowed
10820 // in ARM and Thumb state.
10822 get_aeabi_object_attribute(elfcpp::Tag_CPU_arch)->
10824 int profile = this->
10825 get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile)->
10827 if (in_attr[i].int_value() == out_attr[i].int_value())
10831 else if (attributes_forbid_div(&in_attr[i])
10832 && !attributes_accept_div(arch, profile, &out_attr[i]))
10833 out_attr[i].set_int_value(1);
10834 else if (attributes_forbid_div(&out_attr[i])
10835 && attributes_accept_div(arch, profile, &in_attr[i]))
10836 out_attr[i].set_int_value(in_attr[i].int_value());
10837 else if (in_attr[i].int_value() == 2)
10838 out_attr[i].set_int_value(in_attr[i].int_value());
10842 case elfcpp::Tag_MPextension_use_legacy:
10843 // We don't output objects with Tag_MPextension_use_legacy - we
10844 // move the value to Tag_MPextension_use.
10845 if (in_attr[i].int_value() != 0
10846 && in_attr[elfcpp::Tag_MPextension_use].int_value() != 0)
10848 if (in_attr[elfcpp::Tag_MPextension_use].int_value()
10849 != in_attr[i].int_value())
10851 gold_error(_("%s has has both the current and legacy "
10852 "Tag_MPextension_use attributes"),
10857 if (in_attr[i].int_value()
10858 > out_attr[elfcpp::Tag_MPextension_use].int_value())
10859 out_attr[elfcpp::Tag_MPextension_use] = in_attr[i];
10863 case elfcpp::Tag_nodefaults:
10864 // This tag is set if it exists, but the value is unused (and is
10865 // typically zero). We don't actually need to do anything here -
10866 // the merge happens automatically when the type flags are merged
10869 case elfcpp::Tag_also_compatible_with:
10870 // Already done in Tag_CPU_arch.
10872 case elfcpp::Tag_conformance:
10873 // Keep the attribute if it matches. Throw it away otherwise.
10874 // No attribute means no claim to conform.
10875 if (in_attr[i].string_value() != out_attr[i].string_value())
10876 out_attr[i].set_string_value("");
10881 const char* err_object = NULL;
10883 // The "known_obj_attributes" table does contain some undefined
10884 // attributes. Ensure that there are unused.
10885 if (out_attr[i].int_value() != 0
10886 || out_attr[i].string_value() != "")
10887 err_object = "output";
10888 else if (in_attr[i].int_value() != 0
10889 || in_attr[i].string_value() != "")
10892 if (err_object != NULL
10893 && parameters->options().warn_mismatch())
10895 // Attribute numbers >=64 (mod 128) can be safely ignored.
10896 if ((i & 127) < 64)
10897 gold_error(_("%s: unknown mandatory EABI object attribute "
10901 gold_warning(_("%s: unknown EABI object attribute %d"),
10905 // Only pass on attributes that match in both inputs.
10906 if (!in_attr[i].matches(out_attr[i]))
10908 out_attr[i].set_int_value(0);
10909 out_attr[i].set_string_value("");
10914 // If out_attr was copied from in_attr then it won't have a type yet.
10915 if (in_attr[i].type() && !out_attr[i].type())
10916 out_attr[i].set_type(in_attr[i].type());
10919 // Merge Tag_compatibility attributes and any common GNU ones.
10920 this->attributes_section_data_->merge(name, pasd);
10922 // Check for any attributes not known on ARM.
10923 typedef Vendor_object_attributes::Other_attributes Other_attributes;
10924 const Other_attributes* in_other_attributes = pasd->other_attributes(vendor);
10925 Other_attributes::const_iterator in_iter = in_other_attributes->begin();
10926 Other_attributes* out_other_attributes =
10927 this->attributes_section_data_->other_attributes(vendor);
10928 Other_attributes::iterator out_iter = out_other_attributes->begin();
10930 while (in_iter != in_other_attributes->end()
10931 || out_iter != out_other_attributes->end())
10933 const char* err_object = NULL;
10936 // The tags for each list are in numerical order.
10937 // If the tags are equal, then merge.
10938 if (out_iter != out_other_attributes->end()
10939 && (in_iter == in_other_attributes->end()
10940 || in_iter->first > out_iter->first))
10942 // This attribute only exists in output. We can't merge, and we
10943 // don't know what the tag means, so delete it.
10944 err_object = "output";
10945 err_tag = out_iter->first;
10946 int saved_tag = out_iter->first;
10947 delete out_iter->second;
10948 out_other_attributes->erase(out_iter);
10949 out_iter = out_other_attributes->upper_bound(saved_tag);
10951 else if (in_iter != in_other_attributes->end()
10952 && (out_iter != out_other_attributes->end()
10953 || in_iter->first < out_iter->first))
10955 // This attribute only exists in input. We can't merge, and we
10956 // don't know what the tag means, so ignore it.
10958 err_tag = in_iter->first;
10961 else // The tags are equal.
10963 // As present, all attributes in the list are unknown, and
10964 // therefore can't be merged meaningfully.
10965 err_object = "output";
10966 err_tag = out_iter->first;
10968 // Only pass on attributes that match in both inputs.
10969 if (!in_iter->second->matches(*(out_iter->second)))
10971 // No match. Delete the attribute.
10972 int saved_tag = out_iter->first;
10973 delete out_iter->second;
10974 out_other_attributes->erase(out_iter);
10975 out_iter = out_other_attributes->upper_bound(saved_tag);
10979 // Matched. Keep the attribute and move to the next.
10985 if (err_object && parameters->options().warn_mismatch())
10987 // Attribute numbers >=64 (mod 128) can be safely ignored. */
10988 if ((err_tag & 127) < 64)
10990 gold_error(_("%s: unknown mandatory EABI object attribute %d"),
10991 err_object, err_tag);
10995 gold_warning(_("%s: unknown EABI object attribute %d"),
10996 err_object, err_tag);
11002 // Stub-generation methods for Target_arm.
11004 // Make a new Arm_input_section object.
11006 template<bool big_endian>
11007 Arm_input_section<big_endian>*
11008 Target_arm<big_endian>::new_arm_input_section(
11010 unsigned int shndx)
11012 Section_id sid(relobj, shndx);
11014 Arm_input_section<big_endian>* arm_input_section =
11015 new Arm_input_section<big_endian>(relobj, shndx);
11016 arm_input_section->init();
11018 // Register new Arm_input_section in map for look-up.
11019 std::pair<typename Arm_input_section_map::iterator, bool> ins =
11020 this->arm_input_section_map_.insert(std::make_pair(sid, arm_input_section));
11022 // Make sure that it we have not created another Arm_input_section
11023 // for this input section already.
11024 gold_assert(ins.second);
11026 return arm_input_section;
11029 // Find the Arm_input_section object corresponding to the SHNDX-th input
11030 // section of RELOBJ.
11032 template<bool big_endian>
11033 Arm_input_section<big_endian>*
11034 Target_arm<big_endian>::find_arm_input_section(
11036 unsigned int shndx) const
11038 Section_id sid(relobj, shndx);
11039 typename Arm_input_section_map::const_iterator p =
11040 this->arm_input_section_map_.find(sid);
11041 return (p != this->arm_input_section_map_.end()) ? p->second : NULL;
11044 // Make a new stub table.
11046 template<bool big_endian>
11047 Stub_table<big_endian>*
11048 Target_arm<big_endian>::new_stub_table(Arm_input_section<big_endian>* owner)
11050 Stub_table<big_endian>* stub_table =
11051 new Stub_table<big_endian>(owner);
11052 this->stub_tables_.push_back(stub_table);
11054 stub_table->set_address(owner->address() + owner->data_size());
11055 stub_table->set_file_offset(owner->offset() + owner->data_size());
11056 stub_table->finalize_data_size();
11061 // Scan a relocation for stub generation.
11063 template<bool big_endian>
11065 Target_arm<big_endian>::scan_reloc_for_stub(
11066 const Relocate_info<32, big_endian>* relinfo,
11067 unsigned int r_type,
11068 const Sized_symbol<32>* gsym,
11069 unsigned int r_sym,
11070 const Symbol_value<32>* psymval,
11071 elfcpp::Elf_types<32>::Elf_Swxword addend,
11072 Arm_address address)
11074 const Arm_relobj<big_endian>* arm_relobj =
11075 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
11077 bool target_is_thumb;
11078 Symbol_value<32> symval;
11081 // This is a global symbol. Determine if we use PLT and if the
11082 // final target is THUMB.
11083 if (gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
11085 // This uses a PLT, change the symbol value.
11086 symval.set_output_value(this->plt_section()->address()
11087 + gsym->plt_offset());
11089 target_is_thumb = false;
11091 else if (gsym->is_undefined())
11092 // There is no need to generate a stub symbol is undefined.
11097 ((gsym->type() == elfcpp::STT_ARM_TFUNC)
11098 || (gsym->type() == elfcpp::STT_FUNC
11099 && !gsym->is_undefined()
11100 && ((psymval->value(arm_relobj, 0) & 1) != 0)));
11105 // This is a local symbol. Determine if the final target is THUMB.
11106 target_is_thumb = arm_relobj->local_symbol_is_thumb_function(r_sym);
11109 // Strip LSB if this points to a THUMB target.
11110 const Arm_reloc_property* reloc_property =
11111 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
11112 gold_assert(reloc_property != NULL);
11113 if (target_is_thumb
11114 && reloc_property->uses_thumb_bit()
11115 && ((psymval->value(arm_relobj, 0) & 1) != 0))
11117 Arm_address stripped_value =
11118 psymval->value(arm_relobj, 0) & ~static_cast<Arm_address>(1);
11119 symval.set_output_value(stripped_value);
11123 // Get the symbol value.
11124 Symbol_value<32>::Value value = psymval->value(arm_relobj, 0);
11126 // Owing to pipelining, the PC relative branches below actually skip
11127 // two instructions when the branch offset is 0.
11128 Arm_address destination;
11131 case elfcpp::R_ARM_CALL:
11132 case elfcpp::R_ARM_JUMP24:
11133 case elfcpp::R_ARM_PLT32:
11135 destination = value + addend + 8;
11137 case elfcpp::R_ARM_THM_CALL:
11138 case elfcpp::R_ARM_THM_XPC22:
11139 case elfcpp::R_ARM_THM_JUMP24:
11140 case elfcpp::R_ARM_THM_JUMP19:
11142 destination = value + addend + 4;
11145 gold_unreachable();
11148 Reloc_stub* stub = NULL;
11149 Stub_type stub_type =
11150 Reloc_stub::stub_type_for_reloc(r_type, address, destination,
11152 if (stub_type != arm_stub_none)
11154 // Try looking up an existing stub from a stub table.
11155 Stub_table<big_endian>* stub_table =
11156 arm_relobj->stub_table(relinfo->data_shndx);
11157 gold_assert(stub_table != NULL);
11159 // Locate stub by destination.
11160 Reloc_stub::Key stub_key(stub_type, gsym, arm_relobj, r_sym, addend);
11162 // Create a stub if there is not one already
11163 stub = stub_table->find_reloc_stub(stub_key);
11166 // create a new stub and add it to stub table.
11167 stub = this->stub_factory().make_reloc_stub(stub_type);
11168 stub_table->add_reloc_stub(stub, stub_key);
11171 // Record the destination address.
11172 stub->set_destination_address(destination
11173 | (target_is_thumb ? 1 : 0));
11176 // For Cortex-A8, we need to record a relocation at 4K page boundary.
11177 if (this->fix_cortex_a8_
11178 && (r_type == elfcpp::R_ARM_THM_JUMP24
11179 || r_type == elfcpp::R_ARM_THM_JUMP19
11180 || r_type == elfcpp::R_ARM_THM_CALL
11181 || r_type == elfcpp::R_ARM_THM_XPC22)
11182 && (address & 0xfffU) == 0xffeU)
11184 // Found a candidate. Note we haven't checked the destination is
11185 // within 4K here: if we do so (and don't create a record) we can't
11186 // tell that a branch should have been relocated when scanning later.
11187 this->cortex_a8_relocs_info_[address] =
11188 new Cortex_a8_reloc(stub, r_type,
11189 destination | (target_is_thumb ? 1 : 0));
11193 // This function scans a relocation sections for stub generation.
11194 // The template parameter Relocate must be a class type which provides
11195 // a single function, relocate(), which implements the machine
11196 // specific part of a relocation.
11198 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
11199 // SHT_REL or SHT_RELA.
11201 // PRELOCS points to the relocation data. RELOC_COUNT is the number
11202 // of relocs. OUTPUT_SECTION is the output section.
11203 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
11204 // mapped to output offsets.
11206 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
11207 // VIEW_SIZE is the size. These refer to the input section, unless
11208 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
11209 // the output section.
11211 template<bool big_endian>
11212 template<int sh_type>
11214 Target_arm<big_endian>::scan_reloc_section_for_stubs(
11215 const Relocate_info<32, big_endian>* relinfo,
11216 const unsigned char* prelocs,
11217 size_t reloc_count,
11218 Output_section* output_section,
11219 bool needs_special_offset_handling,
11220 const unsigned char* view,
11221 elfcpp::Elf_types<32>::Elf_Addr view_address,
11224 typedef typename Reloc_types<sh_type, 32, big_endian>::Reloc Reltype;
11225 const int reloc_size =
11226 Reloc_types<sh_type, 32, big_endian>::reloc_size;
11228 Arm_relobj<big_endian>* arm_object =
11229 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
11230 unsigned int local_count = arm_object->local_symbol_count();
11232 gold::Default_comdat_behavior default_comdat_behavior;
11233 Comdat_behavior comdat_behavior = CB_UNDETERMINED;
11235 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
11237 Reltype reloc(prelocs);
11239 typename elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info();
11240 unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
11241 unsigned int r_type = elfcpp::elf_r_type<32>(r_info);
11243 r_type = this->get_real_reloc_type(r_type);
11245 // Only a few relocation types need stubs.
11246 if ((r_type != elfcpp::R_ARM_CALL)
11247 && (r_type != elfcpp::R_ARM_JUMP24)
11248 && (r_type != elfcpp::R_ARM_PLT32)
11249 && (r_type != elfcpp::R_ARM_THM_CALL)
11250 && (r_type != elfcpp::R_ARM_THM_XPC22)
11251 && (r_type != elfcpp::R_ARM_THM_JUMP24)
11252 && (r_type != elfcpp::R_ARM_THM_JUMP19)
11253 && (r_type != elfcpp::R_ARM_V4BX))
11256 section_offset_type offset =
11257 convert_to_section_size_type(reloc.get_r_offset());
11259 if (needs_special_offset_handling)
11261 offset = output_section->output_offset(relinfo->object,
11262 relinfo->data_shndx,
11268 // Create a v4bx stub if --fix-v4bx-interworking is used.
11269 if (r_type == elfcpp::R_ARM_V4BX)
11271 if (this->fix_v4bx() == General_options::FIX_V4BX_INTERWORKING)
11273 // Get the BX instruction.
11274 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
11275 const Valtype* wv =
11276 reinterpret_cast<const Valtype*>(view + offset);
11277 elfcpp::Elf_types<32>::Elf_Swxword insn =
11278 elfcpp::Swap<32, big_endian>::readval(wv);
11279 const uint32_t reg = (insn & 0xf);
11283 // Try looking up an existing stub from a stub table.
11284 Stub_table<big_endian>* stub_table =
11285 arm_object->stub_table(relinfo->data_shndx);
11286 gold_assert(stub_table != NULL);
11288 if (stub_table->find_arm_v4bx_stub(reg) == NULL)
11290 // create a new stub and add it to stub table.
11291 Arm_v4bx_stub* stub =
11292 this->stub_factory().make_arm_v4bx_stub(reg);
11293 gold_assert(stub != NULL);
11294 stub_table->add_arm_v4bx_stub(stub);
11302 Stub_addend_reader<sh_type, big_endian> stub_addend_reader;
11303 elfcpp::Elf_types<32>::Elf_Swxword addend =
11304 stub_addend_reader(r_type, view + offset, reloc);
11306 const Sized_symbol<32>* sym;
11308 Symbol_value<32> symval;
11309 const Symbol_value<32> *psymval;
11310 bool is_defined_in_discarded_section;
11311 unsigned int shndx;
11312 if (r_sym < local_count)
11315 psymval = arm_object->local_symbol(r_sym);
11317 // If the local symbol belongs to a section we are discarding,
11318 // and that section is a debug section, try to find the
11319 // corresponding kept section and map this symbol to its
11320 // counterpart in the kept section. The symbol must not
11321 // correspond to a section we are folding.
11323 shndx = psymval->input_shndx(&is_ordinary);
11324 is_defined_in_discarded_section =
11326 && shndx != elfcpp::SHN_UNDEF
11327 && !arm_object->is_section_included(shndx)
11328 && !relinfo->symtab->is_section_folded(arm_object, shndx));
11330 // We need to compute the would-be final value of this local
11332 if (!is_defined_in_discarded_section)
11334 typedef Sized_relobj_file<32, big_endian> ObjType;
11335 typename ObjType::Compute_final_local_value_status status =
11336 arm_object->compute_final_local_value(r_sym, psymval, &symval,
11338 if (status == ObjType::CFLV_OK)
11340 // Currently we cannot handle a branch to a target in
11341 // a merged section. If this is the case, issue an error
11342 // and also free the merge symbol value.
11343 if (!symval.has_output_value())
11345 const std::string& section_name =
11346 arm_object->section_name(shndx);
11347 arm_object->error(_("cannot handle branch to local %u "
11348 "in a merged section %s"),
11349 r_sym, section_name.c_str());
11355 // We cannot determine the final value.
11362 const Symbol* gsym;
11363 gsym = arm_object->global_symbol(r_sym);
11364 gold_assert(gsym != NULL);
11365 if (gsym->is_forwarder())
11366 gsym = relinfo->symtab->resolve_forwards(gsym);
11368 sym = static_cast<const Sized_symbol<32>*>(gsym);
11369 if (sym->has_symtab_index() && sym->symtab_index() != -1U)
11370 symval.set_output_symtab_index(sym->symtab_index());
11372 symval.set_no_output_symtab_entry();
11374 // We need to compute the would-be final value of this global
11376 const Symbol_table* symtab = relinfo->symtab;
11377 const Sized_symbol<32>* sized_symbol =
11378 symtab->get_sized_symbol<32>(gsym);
11379 Symbol_table::Compute_final_value_status status;
11380 Arm_address value =
11381 symtab->compute_final_value<32>(sized_symbol, &status);
11383 // Skip this if the symbol has not output section.
11384 if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION)
11386 symval.set_output_value(value);
11388 if (gsym->type() == elfcpp::STT_TLS)
11389 symval.set_is_tls_symbol();
11390 else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
11391 symval.set_is_ifunc_symbol();
11394 is_defined_in_discarded_section =
11395 (gsym->is_defined_in_discarded_section()
11396 && gsym->is_undefined());
11400 Symbol_value<32> symval2;
11401 if (is_defined_in_discarded_section)
11403 if (comdat_behavior == CB_UNDETERMINED)
11405 std::string name = arm_object->section_name(relinfo->data_shndx);
11406 comdat_behavior = default_comdat_behavior.get(name.c_str());
11408 if (comdat_behavior == CB_PRETEND)
11410 // FIXME: This case does not work for global symbols.
11411 // We have no place to store the original section index.
11412 // Fortunately this does not matter for comdat sections,
11413 // only for sections explicitly discarded by a linker
11416 typename elfcpp::Elf_types<32>::Elf_Addr value =
11417 arm_object->map_to_kept_section(shndx, &found);
11419 symval2.set_output_value(value + psymval->input_value());
11421 symval2.set_output_value(0);
11425 if (comdat_behavior == CB_WARNING)
11426 gold_warning_at_location(relinfo, i, offset,
11427 _("relocation refers to discarded "
11429 symval2.set_output_value(0);
11431 symval2.set_no_output_symtab_entry();
11432 psymval = &symval2;
11435 // If symbol is a section symbol, we don't know the actual type of
11436 // destination. Give up.
11437 if (psymval->is_section_symbol())
11440 this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval,
11441 addend, view_address + offset);
11445 // Scan an input section for stub generation.
11447 template<bool big_endian>
11449 Target_arm<big_endian>::scan_section_for_stubs(
11450 const Relocate_info<32, big_endian>* relinfo,
11451 unsigned int sh_type,
11452 const unsigned char* prelocs,
11453 size_t reloc_count,
11454 Output_section* output_section,
11455 bool needs_special_offset_handling,
11456 const unsigned char* view,
11457 Arm_address view_address,
11458 section_size_type view_size)
11460 if (sh_type == elfcpp::SHT_REL)
11461 this->scan_reloc_section_for_stubs<elfcpp::SHT_REL>(
11466 needs_special_offset_handling,
11470 else if (sh_type == elfcpp::SHT_RELA)
11471 // We do not support RELA type relocations yet. This is provided for
11473 this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>(
11478 needs_special_offset_handling,
11483 gold_unreachable();
11486 // Group input sections for stub generation.
11488 // We group input sections in an output section so that the total size,
11489 // including any padding space due to alignment is smaller than GROUP_SIZE
11490 // unless the only input section in group is bigger than GROUP_SIZE already.
11491 // Then an ARM stub table is created to follow the last input section
11492 // in group. For each group an ARM stub table is created an is placed
11493 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
11494 // extend the group after the stub table.
11496 template<bool big_endian>
11498 Target_arm<big_endian>::group_sections(
11500 section_size_type group_size,
11501 bool stubs_always_after_branch,
11504 // Group input sections and insert stub table
11505 Layout::Section_list section_list;
11506 layout->get_executable_sections(§ion_list);
11507 for (Layout::Section_list::const_iterator p = section_list.begin();
11508 p != section_list.end();
11511 Arm_output_section<big_endian>* output_section =
11512 Arm_output_section<big_endian>::as_arm_output_section(*p);
11513 output_section->group_sections(group_size, stubs_always_after_branch,
11518 // Relaxation hook. This is where we do stub generation.
11520 template<bool big_endian>
11522 Target_arm<big_endian>::do_relax(
11524 const Input_objects* input_objects,
11525 Symbol_table* symtab,
11529 // No need to generate stubs if this is a relocatable link.
11530 gold_assert(!parameters->options().relocatable());
11532 // If this is the first pass, we need to group input sections into
11534 bool done_exidx_fixup = false;
11535 typedef typename Stub_table_list::iterator Stub_table_iterator;
11538 // Determine the stub group size. The group size is the absolute
11539 // value of the parameter --stub-group-size. If --stub-group-size
11540 // is passed a negative value, we restrict stubs to be always after
11541 // the stubbed branches.
11542 int32_t stub_group_size_param =
11543 parameters->options().stub_group_size();
11544 bool stubs_always_after_branch = stub_group_size_param < 0;
11545 section_size_type stub_group_size = abs(stub_group_size_param);
11547 if (stub_group_size == 1)
11550 // Thumb branch range is +-4MB has to be used as the default
11551 // maximum size (a given section can contain both ARM and Thumb
11552 // code, so the worst case has to be taken into account). If we are
11553 // fixing cortex-a8 errata, the branch range has to be even smaller,
11554 // since wide conditional branch has a range of +-1MB only.
11556 // This value is 48K less than that, which allows for 4096
11557 // 12-byte stubs. If we exceed that, then we will fail to link.
11558 // The user will have to relink with an explicit group size
11560 stub_group_size = 4145152;
11563 // The Cortex-A8 erratum fix depends on stubs not being in the same 4K
11564 // page as the first half of a 32-bit branch straddling two 4K pages.
11565 // This is a crude way of enforcing that. In addition, long conditional
11566 // branches of THUMB-2 have a range of +-1M. If we are fixing cortex-A8
11567 // erratum, limit the group size to (1M - 12k) to avoid unreachable
11568 // cortex-A8 stubs from long conditional branches.
11569 if (this->fix_cortex_a8_)
11571 stubs_always_after_branch = true;
11572 const section_size_type cortex_a8_group_size = 1024 * (1024 - 12);
11573 stub_group_size = std::max(stub_group_size, cortex_a8_group_size);
11576 group_sections(layout, stub_group_size, stubs_always_after_branch, task);
11578 // Also fix .ARM.exidx section coverage.
11579 Arm_output_section<big_endian>* exidx_output_section = NULL;
11580 for (Layout::Section_list::const_iterator p =
11581 layout->section_list().begin();
11582 p != layout->section_list().end();
11584 if ((*p)->type() == elfcpp::SHT_ARM_EXIDX)
11586 if (exidx_output_section == NULL)
11587 exidx_output_section =
11588 Arm_output_section<big_endian>::as_arm_output_section(*p);
11590 // We cannot handle this now.
11591 gold_error(_("multiple SHT_ARM_EXIDX sections %s and %s in a "
11592 "non-relocatable link"),
11593 exidx_output_section->name(),
11597 if (exidx_output_section != NULL)
11599 this->fix_exidx_coverage(layout, input_objects, exidx_output_section,
11601 done_exidx_fixup = true;
11606 // If this is not the first pass, addresses and file offsets have
11607 // been reset at this point, set them here.
11608 for (Stub_table_iterator sp = this->stub_tables_.begin();
11609 sp != this->stub_tables_.end();
11612 Arm_input_section<big_endian>* owner = (*sp)->owner();
11613 off_t off = align_address(owner->original_size(),
11614 (*sp)->addralign());
11615 (*sp)->set_address_and_file_offset(owner->address() + off,
11616 owner->offset() + off);
11620 // The Cortex-A8 stubs are sensitive to layout of code sections. At the
11621 // beginning of each relaxation pass, just blow away all the stubs.
11622 // Alternatively, we could selectively remove only the stubs and reloc
11623 // information for code sections that have moved since the last pass.
11624 // That would require more book-keeping.
11625 if (this->fix_cortex_a8_)
11627 // Clear all Cortex-A8 reloc information.
11628 for (typename Cortex_a8_relocs_info::const_iterator p =
11629 this->cortex_a8_relocs_info_.begin();
11630 p != this->cortex_a8_relocs_info_.end();
11633 this->cortex_a8_relocs_info_.clear();
11635 // Remove all Cortex-A8 stubs.
11636 for (Stub_table_iterator sp = this->stub_tables_.begin();
11637 sp != this->stub_tables_.end();
11639 (*sp)->remove_all_cortex_a8_stubs();
11642 // Scan relocs for relocation stubs
11643 for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
11644 op != input_objects->relobj_end();
11647 Arm_relobj<big_endian>* arm_relobj =
11648 Arm_relobj<big_endian>::as_arm_relobj(*op);
11649 // Lock the object so we can read from it. This is only called
11650 // single-threaded from Layout::finalize, so it is OK to lock.
11651 Task_lock_obj<Object> tl(task, arm_relobj);
11652 arm_relobj->scan_sections_for_stubs(this, symtab, layout);
11655 // Check all stub tables to see if any of them have their data sizes
11656 // or addresses alignments changed. These are the only things that
11658 bool any_stub_table_changed = false;
11659 Unordered_set<const Output_section*> sections_needing_adjustment;
11660 for (Stub_table_iterator sp = this->stub_tables_.begin();
11661 (sp != this->stub_tables_.end()) && !any_stub_table_changed;
11664 if ((*sp)->update_data_size_and_addralign())
11666 // Update data size of stub table owner.
11667 Arm_input_section<big_endian>* owner = (*sp)->owner();
11668 uint64_t address = owner->address();
11669 off_t offset = owner->offset();
11670 owner->reset_address_and_file_offset();
11671 owner->set_address_and_file_offset(address, offset);
11673 sections_needing_adjustment.insert(owner->output_section());
11674 any_stub_table_changed = true;
11678 // Output_section_data::output_section() returns a const pointer but we
11679 // need to update output sections, so we record all output sections needing
11680 // update above and scan the sections here to find out what sections need
11682 for (Layout::Section_list::const_iterator p = layout->section_list().begin();
11683 p != layout->section_list().end();
11686 if (sections_needing_adjustment.find(*p)
11687 != sections_needing_adjustment.end())
11688 (*p)->set_section_offsets_need_adjustment();
11691 // Stop relaxation if no EXIDX fix-up and no stub table change.
11692 bool continue_relaxation = done_exidx_fixup || any_stub_table_changed;
11694 // Finalize the stubs in the last relaxation pass.
11695 if (!continue_relaxation)
11697 for (Stub_table_iterator sp = this->stub_tables_.begin();
11698 (sp != this->stub_tables_.end()) && !any_stub_table_changed;
11700 (*sp)->finalize_stubs();
11702 // Update output local symbol counts of objects if necessary.
11703 for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
11704 op != input_objects->relobj_end();
11707 Arm_relobj<big_endian>* arm_relobj =
11708 Arm_relobj<big_endian>::as_arm_relobj(*op);
11710 // Update output local symbol counts. We need to discard local
11711 // symbols defined in parts of input sections that are discarded by
11713 if (arm_relobj->output_local_symbol_count_needs_update())
11715 // We need to lock the object's file to update it.
11716 Task_lock_obj<Object> tl(task, arm_relobj);
11717 arm_relobj->update_output_local_symbol_count();
11722 return continue_relaxation;
11725 // Relocate a stub.
11727 template<bool big_endian>
11729 Target_arm<big_endian>::relocate_stub(
11731 const Relocate_info<32, big_endian>* relinfo,
11732 Output_section* output_section,
11733 unsigned char* view,
11734 Arm_address address,
11735 section_size_type view_size)
11738 const Stub_template* stub_template = stub->stub_template();
11739 for (size_t i = 0; i < stub_template->reloc_count(); i++)
11741 size_t reloc_insn_index = stub_template->reloc_insn_index(i);
11742 const Insn_template* insn = &stub_template->insns()[reloc_insn_index];
11744 unsigned int r_type = insn->r_type();
11745 section_size_type reloc_offset = stub_template->reloc_offset(i);
11746 section_size_type reloc_size = insn->size();
11747 gold_assert(reloc_offset + reloc_size <= view_size);
11749 // This is the address of the stub destination.
11750 Arm_address target = stub->reloc_target(i) + insn->reloc_addend();
11751 Symbol_value<32> symval;
11752 symval.set_output_value(target);
11754 // Synthesize a fake reloc just in case. We don't have a symbol so
11756 unsigned char reloc_buffer[elfcpp::Elf_sizes<32>::rel_size];
11757 memset(reloc_buffer, 0, sizeof(reloc_buffer));
11758 elfcpp::Rel_write<32, big_endian> reloc_write(reloc_buffer);
11759 reloc_write.put_r_offset(reloc_offset);
11760 reloc_write.put_r_info(elfcpp::elf_r_info<32>(0, r_type));
11761 elfcpp::Rel<32, big_endian> rel(reloc_buffer);
11763 relocate.relocate(relinfo, this, output_section,
11764 this->fake_relnum_for_stubs, rel, r_type,
11765 NULL, &symval, view + reloc_offset,
11766 address + reloc_offset, reloc_size);
11770 // Determine whether an object attribute tag takes an integer, a
11773 template<bool big_endian>
11775 Target_arm<big_endian>::do_attribute_arg_type(int tag) const
11777 if (tag == Object_attribute::Tag_compatibility)
11778 return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL
11779 | Object_attribute::ATTR_TYPE_FLAG_STR_VAL);
11780 else if (tag == elfcpp::Tag_nodefaults)
11781 return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL
11782 | Object_attribute::ATTR_TYPE_FLAG_NO_DEFAULT);
11783 else if (tag == elfcpp::Tag_CPU_raw_name || tag == elfcpp::Tag_CPU_name)
11784 return Object_attribute::ATTR_TYPE_FLAG_STR_VAL;
11786 return Object_attribute::ATTR_TYPE_FLAG_INT_VAL;
11788 return ((tag & 1) != 0
11789 ? Object_attribute::ATTR_TYPE_FLAG_STR_VAL
11790 : Object_attribute::ATTR_TYPE_FLAG_INT_VAL);
11793 // Reorder attributes.
11795 // The ABI defines that Tag_conformance should be emitted first, and that
11796 // Tag_nodefaults should be second (if either is defined). This sets those
11797 // two positions, and bumps up the position of all the remaining tags to
11800 template<bool big_endian>
11802 Target_arm<big_endian>::do_attributes_order(int num) const
11804 // Reorder the known object attributes in output. We want to move
11805 // Tag_conformance to position 4 and Tag_conformance to position 5
11806 // and shift everything between 4 .. Tag_conformance - 1 to make room.
11808 return elfcpp::Tag_conformance;
11810 return elfcpp::Tag_nodefaults;
11811 if ((num - 2) < elfcpp::Tag_nodefaults)
11813 if ((num - 1) < elfcpp::Tag_conformance)
11818 // Scan a span of THUMB code for Cortex-A8 erratum.
11820 template<bool big_endian>
11822 Target_arm<big_endian>::scan_span_for_cortex_a8_erratum(
11823 Arm_relobj<big_endian>* arm_relobj,
11824 unsigned int shndx,
11825 section_size_type span_start,
11826 section_size_type span_end,
11827 const unsigned char* view,
11828 Arm_address address)
11830 // Scan for 32-bit Thumb-2 branches which span two 4K regions, where:
11832 // The opcode is BLX.W, BL.W, B.W, Bcc.W
11833 // The branch target is in the same 4KB region as the
11834 // first half of the branch.
11835 // The instruction before the branch is a 32-bit
11836 // length non-branch instruction.
11837 section_size_type i = span_start;
11838 bool last_was_32bit = false;
11839 bool last_was_branch = false;
11840 while (i < span_end)
11842 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
11843 const Valtype* wv = reinterpret_cast<const Valtype*>(view + i);
11844 uint32_t insn = elfcpp::Swap<16, big_endian>::readval(wv);
11845 bool is_blx = false, is_b = false;
11846 bool is_bl = false, is_bcc = false;
11848 bool insn_32bit = (insn & 0xe000) == 0xe000 && (insn & 0x1800) != 0x0000;
11851 // Load the rest of the insn (in manual-friendly order).
11852 insn = (insn << 16) | elfcpp::Swap<16, big_endian>::readval(wv + 1);
11854 // Encoding T4: B<c>.W.
11855 is_b = (insn & 0xf800d000U) == 0xf0009000U;
11856 // Encoding T1: BL<c>.W.
11857 is_bl = (insn & 0xf800d000U) == 0xf000d000U;
11858 // Encoding T2: BLX<c>.W.
11859 is_blx = (insn & 0xf800d000U) == 0xf000c000U;
11860 // Encoding T3: B<c>.W (not permitted in IT block).
11861 is_bcc = ((insn & 0xf800d000U) == 0xf0008000U
11862 && (insn & 0x07f00000U) != 0x03800000U);
11865 bool is_32bit_branch = is_b || is_bl || is_blx || is_bcc;
11867 // If this instruction is a 32-bit THUMB branch that crosses a 4K
11868 // page boundary and it follows 32-bit non-branch instruction,
11869 // we need to work around.
11870 if (is_32bit_branch
11871 && ((address + i) & 0xfffU) == 0xffeU
11873 && !last_was_branch)
11875 // Check to see if there is a relocation stub for this branch.
11876 bool force_target_arm = false;
11877 bool force_target_thumb = false;
11878 const Cortex_a8_reloc* cortex_a8_reloc = NULL;
11879 Cortex_a8_relocs_info::const_iterator p =
11880 this->cortex_a8_relocs_info_.find(address + i);
11882 if (p != this->cortex_a8_relocs_info_.end())
11884 cortex_a8_reloc = p->second;
11885 bool target_is_thumb = (cortex_a8_reloc->destination() & 1) != 0;
11887 if (cortex_a8_reloc->r_type() == elfcpp::R_ARM_THM_CALL
11888 && !target_is_thumb)
11889 force_target_arm = true;
11890 else if (cortex_a8_reloc->r_type() == elfcpp::R_ARM_THM_CALL
11891 && target_is_thumb)
11892 force_target_thumb = true;
11896 Stub_type stub_type = arm_stub_none;
11898 // Check if we have an offending branch instruction.
11899 uint16_t upper_insn = (insn >> 16) & 0xffffU;
11900 uint16_t lower_insn = insn & 0xffffU;
11901 typedef class Arm_relocate_functions<big_endian> RelocFuncs;
11903 if (cortex_a8_reloc != NULL
11904 && cortex_a8_reloc->reloc_stub() != NULL)
11905 // We've already made a stub for this instruction, e.g.
11906 // it's a long branch or a Thumb->ARM stub. Assume that
11907 // stub will suffice to work around the A8 erratum (see
11908 // setting of always_after_branch above).
11912 offset = RelocFuncs::thumb32_cond_branch_offset(upper_insn,
11914 stub_type = arm_stub_a8_veneer_b_cond;
11916 else if (is_b || is_bl || is_blx)
11918 offset = RelocFuncs::thumb32_branch_offset(upper_insn,
11923 stub_type = (is_blx
11924 ? arm_stub_a8_veneer_blx
11926 ? arm_stub_a8_veneer_bl
11927 : arm_stub_a8_veneer_b));
11930 if (stub_type != arm_stub_none)
11932 Arm_address pc_for_insn = address + i + 4;
11934 // The original instruction is a BL, but the target is
11935 // an ARM instruction. If we were not making a stub,
11936 // the BL would have been converted to a BLX. Use the
11937 // BLX stub instead in that case.
11938 if (this->may_use_v5t_interworking() && force_target_arm
11939 && stub_type == arm_stub_a8_veneer_bl)
11941 stub_type = arm_stub_a8_veneer_blx;
11945 // Conversely, if the original instruction was
11946 // BLX but the target is Thumb mode, use the BL stub.
11947 else if (force_target_thumb
11948 && stub_type == arm_stub_a8_veneer_blx)
11950 stub_type = arm_stub_a8_veneer_bl;
11958 // If we found a relocation, use the proper destination,
11959 // not the offset in the (unrelocated) instruction.
11960 // Note this is always done if we switched the stub type above.
11961 if (cortex_a8_reloc != NULL)
11962 offset = (off_t) (cortex_a8_reloc->destination() - pc_for_insn);
11964 Arm_address target = (pc_for_insn + offset) | (is_blx ? 0 : 1);
11966 // Add a new stub if destination address in in the same page.
11967 if (((address + i) & ~0xfffU) == (target & ~0xfffU))
11969 Cortex_a8_stub* stub =
11970 this->stub_factory_.make_cortex_a8_stub(stub_type,
11974 Stub_table<big_endian>* stub_table =
11975 arm_relobj->stub_table(shndx);
11976 gold_assert(stub_table != NULL);
11977 stub_table->add_cortex_a8_stub(address + i, stub);
11982 i += insn_32bit ? 4 : 2;
11983 last_was_32bit = insn_32bit;
11984 last_was_branch = is_32bit_branch;
11988 // Apply the Cortex-A8 workaround.
11990 template<bool big_endian>
11992 Target_arm<big_endian>::apply_cortex_a8_workaround(
11993 const Cortex_a8_stub* stub,
11994 Arm_address stub_address,
11995 unsigned char* insn_view,
11996 Arm_address insn_address)
11998 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
11999 Valtype* wv = reinterpret_cast<Valtype*>(insn_view);
12000 Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
12001 Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
12002 off_t branch_offset = stub_address - (insn_address + 4);
12004 typedef class Arm_relocate_functions<big_endian> RelocFuncs;
12005 switch (stub->stub_template()->type())
12007 case arm_stub_a8_veneer_b_cond:
12008 // For a conditional branch, we re-write it to be an unconditional
12009 // branch to the stub. We use the THUMB-2 encoding here.
12010 upper_insn = 0xf000U;
12011 lower_insn = 0xb800U;
12013 case arm_stub_a8_veneer_b:
12014 case arm_stub_a8_veneer_bl:
12015 case arm_stub_a8_veneer_blx:
12016 if ((lower_insn & 0x5000U) == 0x4000U)
12017 // For a BLX instruction, make sure that the relocation is
12018 // rounded up to a word boundary. This follows the semantics of
12019 // the instruction which specifies that bit 1 of the target
12020 // address will come from bit 1 of the base address.
12021 branch_offset = (branch_offset + 2) & ~3;
12023 // Put BRANCH_OFFSET back into the insn.
12024 gold_assert(!Bits<25>::has_overflow32(branch_offset));
12025 upper_insn = RelocFuncs::thumb32_branch_upper(upper_insn, branch_offset);
12026 lower_insn = RelocFuncs::thumb32_branch_lower(lower_insn, branch_offset);
12030 gold_unreachable();
12033 // Put the relocated value back in the object file:
12034 elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn);
12035 elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn);
12038 // Target selector for ARM. Note this is never instantiated directly.
12039 // It's only used in Target_selector_arm_nacl, below.
12041 template<bool big_endian>
12042 class Target_selector_arm : public Target_selector
12045 Target_selector_arm()
12046 : Target_selector(elfcpp::EM_ARM, 32, big_endian,
12047 (big_endian ? "elf32-bigarm" : "elf32-littlearm"),
12048 (big_endian ? "armelfb" : "armelf"))
12052 do_instantiate_target()
12053 { return new Target_arm<big_endian>(); }
12056 // Fix .ARM.exidx section coverage.
12058 template<bool big_endian>
12060 Target_arm<big_endian>::fix_exidx_coverage(
12062 const Input_objects* input_objects,
12063 Arm_output_section<big_endian>* exidx_section,
12064 Symbol_table* symtab,
12067 // We need to look at all the input sections in output in ascending
12068 // order of of output address. We do that by building a sorted list
12069 // of output sections by addresses. Then we looks at the output sections
12070 // in order. The input sections in an output section are already sorted
12071 // by addresses within the output section.
12073 typedef std::set<Output_section*, output_section_address_less_than>
12074 Sorted_output_section_list;
12075 Sorted_output_section_list sorted_output_sections;
12077 // Find out all the output sections of input sections pointed by
12078 // EXIDX input sections.
12079 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
12080 p != input_objects->relobj_end();
12083 Arm_relobj<big_endian>* arm_relobj =
12084 Arm_relobj<big_endian>::as_arm_relobj(*p);
12085 std::vector<unsigned int> shndx_list;
12086 arm_relobj->get_exidx_shndx_list(&shndx_list);
12087 for (size_t i = 0; i < shndx_list.size(); ++i)
12089 const Arm_exidx_input_section* exidx_input_section =
12090 arm_relobj->exidx_input_section_by_shndx(shndx_list[i]);
12091 gold_assert(exidx_input_section != NULL);
12092 if (!exidx_input_section->has_errors())
12094 unsigned int text_shndx = exidx_input_section->link();
12095 Output_section* os = arm_relobj->output_section(text_shndx);
12096 if (os != NULL && (os->flags() & elfcpp::SHF_ALLOC) != 0)
12097 sorted_output_sections.insert(os);
12102 // Go over the output sections in ascending order of output addresses.
12103 typedef typename Arm_output_section<big_endian>::Text_section_list
12105 Text_section_list sorted_text_sections;
12106 for (typename Sorted_output_section_list::iterator p =
12107 sorted_output_sections.begin();
12108 p != sorted_output_sections.end();
12111 Arm_output_section<big_endian>* arm_output_section =
12112 Arm_output_section<big_endian>::as_arm_output_section(*p);
12113 arm_output_section->append_text_sections_to_list(&sorted_text_sections);
12116 exidx_section->fix_exidx_coverage(layout, sorted_text_sections, symtab,
12117 merge_exidx_entries(), task);
12120 template<bool big_endian>
12122 Target_arm<big_endian>::do_define_standard_symbols(
12123 Symbol_table* symtab,
12126 // Handle the .ARM.exidx section.
12127 Output_section* exidx_section = layout->find_output_section(".ARM.exidx");
12129 if (exidx_section != NULL)
12131 // Create __exidx_start and __exidx_end symbols.
12132 symtab->define_in_output_data("__exidx_start",
12134 Symbol_table::PREDEFINED,
12138 elfcpp::STT_NOTYPE,
12139 elfcpp::STB_GLOBAL,
12140 elfcpp::STV_HIDDEN,
12142 false, // offset_is_from_end
12143 true); // only_if_ref
12145 symtab->define_in_output_data("__exidx_end",
12147 Symbol_table::PREDEFINED,
12151 elfcpp::STT_NOTYPE,
12152 elfcpp::STB_GLOBAL,
12153 elfcpp::STV_HIDDEN,
12155 true, // offset_is_from_end
12156 true); // only_if_ref
12160 // Define __exidx_start and __exidx_end even when .ARM.exidx
12161 // section is missing to match ld's behaviour.
12162 symtab->define_as_constant("__exidx_start", NULL,
12163 Symbol_table::PREDEFINED,
12164 0, 0, elfcpp::STT_OBJECT,
12165 elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0,
12167 symtab->define_as_constant("__exidx_end", NULL,
12168 Symbol_table::PREDEFINED,
12169 0, 0, elfcpp::STT_OBJECT,
12170 elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0,
12175 // NaCl variant. It uses different PLT contents.
12177 template<bool big_endian>
12178 class Output_data_plt_arm_nacl;
12180 template<bool big_endian>
12181 class Target_arm_nacl : public Target_arm<big_endian>
12185 : Target_arm<big_endian>(&arm_nacl_info)
12189 virtual Output_data_plt_arm<big_endian>*
12190 do_make_data_plt(Layout* layout, Output_data_space* got_plt)
12191 { return new Output_data_plt_arm_nacl<big_endian>(layout, got_plt); }
12194 static const Target::Target_info arm_nacl_info;
12197 template<bool big_endian>
12198 const Target::Target_info Target_arm_nacl<big_endian>::arm_nacl_info =
12201 big_endian, // is_big_endian
12202 elfcpp::EM_ARM, // machine_code
12203 false, // has_make_symbol
12204 false, // has_resolve
12205 false, // has_code_fill
12206 true, // is_default_stack_executable
12207 false, // can_icf_inline_merge_sections
12209 "/lib/ld-nacl-arm.so.1", // dynamic_linker
12210 0x20000, // default_text_segment_address
12211 0x10000, // abi_pagesize (overridable by -z max-page-size)
12212 0x10000, // common_pagesize (overridable by -z common-page-size)
12213 true, // isolate_execinstr
12214 0x10000000, // rosegment_gap
12215 elfcpp::SHN_UNDEF, // small_common_shndx
12216 elfcpp::SHN_UNDEF, // large_common_shndx
12217 0, // small_common_section_flags
12218 0, // large_common_section_flags
12219 ".ARM.attributes", // attributes_section
12220 "aeabi", // attributes_vendor
12221 "_start" // entry_symbol_name
12224 template<bool big_endian>
12225 class Output_data_plt_arm_nacl : public Output_data_plt_arm<big_endian>
12228 Output_data_plt_arm_nacl(Layout* layout, Output_data_space* got_plt)
12229 : Output_data_plt_arm<big_endian>(layout, 16, got_plt)
12233 // Return the offset of the first non-reserved PLT entry.
12234 virtual unsigned int
12235 do_first_plt_entry_offset() const
12236 { return sizeof(first_plt_entry); }
12238 // Return the size of a PLT entry.
12239 virtual unsigned int
12240 do_get_plt_entry_size() const
12241 { return sizeof(plt_entry); }
12244 do_fill_first_plt_entry(unsigned char* pov,
12245 Arm_address got_address,
12246 Arm_address plt_address);
12249 do_fill_plt_entry(unsigned char* pov,
12250 Arm_address got_address,
12251 Arm_address plt_address,
12252 unsigned int got_offset,
12253 unsigned int plt_offset);
12256 inline uint32_t arm_movw_immediate(uint32_t value)
12258 return (value & 0x00000fff) | ((value & 0x0000f000) << 4);
12261 inline uint32_t arm_movt_immediate(uint32_t value)
12263 return ((value & 0x0fff0000) >> 16) | ((value & 0xf0000000) >> 12);
12266 // Template for the first PLT entry.
12267 static const uint32_t first_plt_entry[16];
12269 // Template for subsequent PLT entries.
12270 static const uint32_t plt_entry[4];
12273 // The first entry in the PLT.
12274 template<bool big_endian>
12275 const uint32_t Output_data_plt_arm_nacl<big_endian>::first_plt_entry[16] =
12278 0xe300c000, // movw ip, #:lower16:&GOT[2]-.+8
12279 0xe340c000, // movt ip, #:upper16:&GOT[2]-.+8
12280 0xe08cc00f, // add ip, ip, pc
12281 0xe52dc008, // str ip, [sp, #-8]!
12283 0xe3ccc103, // bic ip, ip, #0xc0000000
12284 0xe59cc000, // ldr ip, [ip]
12285 0xe3ccc13f, // bic ip, ip, #0xc000000f
12286 0xe12fff1c, // bx ip
12292 0xe50dc004, // str ip, [sp, #-4]
12294 0xe3ccc103, // bic ip, ip, #0xc0000000
12295 0xe59cc000, // ldr ip, [ip]
12296 0xe3ccc13f, // bic ip, ip, #0xc000000f
12297 0xe12fff1c, // bx ip
12300 template<bool big_endian>
12302 Output_data_plt_arm_nacl<big_endian>::do_fill_first_plt_entry(
12303 unsigned char* pov,
12304 Arm_address got_address,
12305 Arm_address plt_address)
12307 // Write first PLT entry. All but first two words are constants.
12308 const size_t num_first_plt_words = (sizeof(first_plt_entry)
12309 / sizeof(first_plt_entry[0]));
12311 int32_t got_displacement = got_address + 8 - (plt_address + 16);
12313 elfcpp::Swap<32, big_endian>::writeval
12314 (pov + 0, first_plt_entry[0] | arm_movw_immediate (got_displacement));
12315 elfcpp::Swap<32, big_endian>::writeval
12316 (pov + 4, first_plt_entry[1] | arm_movt_immediate (got_displacement));
12318 for (size_t i = 2; i < num_first_plt_words; ++i)
12319 elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]);
12322 // Subsequent entries in the PLT.
12324 template<bool big_endian>
12325 const uint32_t Output_data_plt_arm_nacl<big_endian>::plt_entry[4] =
12327 0xe300c000, // movw ip, #:lower16:&GOT[n]-.+8
12328 0xe340c000, // movt ip, #:upper16:&GOT[n]-.+8
12329 0xe08cc00f, // add ip, ip, pc
12330 0xea000000, // b .Lplt_tail
12333 template<bool big_endian>
12335 Output_data_plt_arm_nacl<big_endian>::do_fill_plt_entry(
12336 unsigned char* pov,
12337 Arm_address got_address,
12338 Arm_address plt_address,
12339 unsigned int got_offset,
12340 unsigned int plt_offset)
12342 // Calculate the displacement between the PLT slot and the
12343 // common tail that's part of the special initial PLT slot.
12344 int32_t tail_displacement = (plt_address + (11 * sizeof(uint32_t))
12345 - (plt_address + plt_offset
12346 + sizeof(plt_entry) + sizeof(uint32_t)));
12347 gold_assert((tail_displacement & 3) == 0);
12348 tail_displacement >>= 2;
12350 gold_assert ((tail_displacement & 0xff000000) == 0
12351 || (-tail_displacement & 0xff000000) == 0);
12353 // Calculate the displacement between the PLT slot and the entry
12354 // in the GOT. The offset accounts for the value produced by
12355 // adding to pc in the penultimate instruction of the PLT stub.
12356 const int32_t got_displacement = (got_address + got_offset
12357 - (plt_address + sizeof(plt_entry)));
12359 elfcpp::Swap<32, big_endian>::writeval
12360 (pov + 0, plt_entry[0] | arm_movw_immediate (got_displacement));
12361 elfcpp::Swap<32, big_endian>::writeval
12362 (pov + 4, plt_entry[1] | arm_movt_immediate (got_displacement));
12363 elfcpp::Swap<32, big_endian>::writeval
12364 (pov + 8, plt_entry[2]);
12365 elfcpp::Swap<32, big_endian>::writeval
12366 (pov + 12, plt_entry[3] | (tail_displacement & 0x00ffffff));
12369 // Target selectors.
12371 template<bool big_endian>
12372 class Target_selector_arm_nacl
12373 : public Target_selector_nacl<Target_selector_arm<big_endian>,
12374 Target_arm_nacl<big_endian> >
12377 Target_selector_arm_nacl()
12378 : Target_selector_nacl<Target_selector_arm<big_endian>,
12379 Target_arm_nacl<big_endian> >(
12381 big_endian ? "elf32-bigarm-nacl" : "elf32-littlearm-nacl",
12382 big_endian ? "armelfb_nacl" : "armelf_nacl")
12386 Target_selector_arm_nacl<false> target_selector_arm;
12387 Target_selector_arm_nacl<true> target_selector_armbe;
12389 } // End anonymous namespace.