1 // arm.cc -- arm target support for gold.
3 // Copyright 2009, 2010, 2011, 2012 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 off_t offset_in_output_section,
2297 const Relocatable_relocs*,
2298 unsigned char* view,
2299 Arm_address view_address,
2300 section_size_type view_size,
2301 unsigned char* reloc_view,
2302 section_size_type reloc_view_size);
2304 // Perform target-specific processing in a relocatable link. This is
2305 // only used if we use the relocation strategy RELOC_SPECIAL.
2307 relocate_special_relocatable(const Relocate_info<32, big_endian>* relinfo,
2308 unsigned int sh_type,
2309 const unsigned char* preloc_in,
2311 Output_section* output_section,
2312 off_t offset_in_output_section,
2313 unsigned char* view,
2314 typename elfcpp::Elf_types<32>::Elf_Addr
2316 section_size_type view_size,
2317 unsigned char* preloc_out);
2319 // Return whether SYM is defined by the ABI.
2321 do_is_defined_by_abi(const Symbol* sym) const
2322 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
2324 // Return whether there is a GOT section.
2326 has_got_section() const
2327 { return this->got_ != NULL; }
2329 // Return the size of the GOT section.
2333 gold_assert(this->got_ != NULL);
2334 return this->got_->data_size();
2337 // Return the number of entries in the GOT.
2339 got_entry_count() const
2341 if (!this->has_got_section())
2343 return this->got_size() / 4;
2346 // Return the number of entries in the PLT.
2348 plt_entry_count() const;
2350 // Return the offset of the first non-reserved PLT entry.
2352 first_plt_entry_offset() const;
2354 // Return the size of each PLT entry.
2356 plt_entry_size() const;
2358 // Map platform-specific reloc types
2360 get_real_reloc_type(unsigned int r_type);
2363 // Methods to support stub-generations.
2366 // Return the stub factory
2368 stub_factory() const
2369 { return this->stub_factory_; }
2371 // Make a new Arm_input_section object.
2372 Arm_input_section<big_endian>*
2373 new_arm_input_section(Relobj*, unsigned int);
2375 // Find the Arm_input_section object corresponding to the SHNDX-th input
2376 // section of RELOBJ.
2377 Arm_input_section<big_endian>*
2378 find_arm_input_section(Relobj* relobj, unsigned int shndx) const;
2380 // Make a new Stub_table
2381 Stub_table<big_endian>*
2382 new_stub_table(Arm_input_section<big_endian>*);
2384 // Scan a section for stub generation.
2386 scan_section_for_stubs(const Relocate_info<32, big_endian>*, unsigned int,
2387 const unsigned char*, size_t, Output_section*,
2388 bool, const unsigned char*, Arm_address,
2393 relocate_stub(Stub*, const Relocate_info<32, big_endian>*,
2394 Output_section*, unsigned char*, Arm_address,
2397 // Get the default ARM target.
2398 static Target_arm<big_endian>*
2401 gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM
2402 && parameters->target().is_big_endian() == big_endian);
2403 return static_cast<Target_arm<big_endian>*>(
2404 parameters->sized_target<32, big_endian>());
2407 // Whether NAME belongs to a mapping symbol.
2409 is_mapping_symbol_name(const char* name)
2413 && (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
2414 && (name[2] == '\0' || name[2] == '.'));
2417 // Whether we work around the Cortex-A8 erratum.
2419 fix_cortex_a8() const
2420 { return this->fix_cortex_a8_; }
2422 // Whether we merge exidx entries in debuginfo.
2424 merge_exidx_entries() const
2425 { return parameters->options().merge_exidx_entries(); }
2427 // Whether we fix R_ARM_V4BX relocation.
2429 // 1 - replace with MOV instruction (armv4 target)
2430 // 2 - make interworking veneer (>= armv4t targets only)
2431 General_options::Fix_v4bx
2433 { return parameters->options().fix_v4bx(); }
2435 // Scan a span of THUMB code section for Cortex-A8 erratum.
2437 scan_span_for_cortex_a8_erratum(Arm_relobj<big_endian>*, unsigned int,
2438 section_size_type, section_size_type,
2439 const unsigned char*, Arm_address);
2441 // Apply Cortex-A8 workaround to a branch.
2443 apply_cortex_a8_workaround(const Cortex_a8_stub*, Arm_address,
2444 unsigned char*, Arm_address);
2447 // Make the PLT-generator object.
2448 Output_data_plt_arm<big_endian>*
2449 make_data_plt(Layout* layout, Output_data_space* got_plt)
2450 { return this->do_make_data_plt(layout, got_plt); }
2452 // Make an ELF object.
2454 do_make_elf_object(const std::string&, Input_file*, off_t,
2455 const elfcpp::Ehdr<32, big_endian>& ehdr);
2458 do_make_elf_object(const std::string&, Input_file*, off_t,
2459 const elfcpp::Ehdr<32, !big_endian>&)
2460 { gold_unreachable(); }
2463 do_make_elf_object(const std::string&, Input_file*, off_t,
2464 const elfcpp::Ehdr<64, false>&)
2465 { gold_unreachable(); }
2468 do_make_elf_object(const std::string&, Input_file*, off_t,
2469 const elfcpp::Ehdr<64, true>&)
2470 { gold_unreachable(); }
2472 // Make an output section.
2474 do_make_output_section(const char* name, elfcpp::Elf_Word type,
2475 elfcpp::Elf_Xword flags)
2476 { return new Arm_output_section<big_endian>(name, type, flags); }
2479 do_adjust_elf_header(unsigned char* view, int len) const;
2481 // We only need to generate stubs, and hence perform relaxation if we are
2482 // not doing relocatable linking.
2484 do_may_relax() const
2485 { return !parameters->options().relocatable(); }
2488 do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
2490 // Determine whether an object attribute tag takes an integer, a
2493 do_attribute_arg_type(int tag) const;
2495 // Reorder tags during output.
2497 do_attributes_order(int num) const;
2499 // This is called when the target is selected as the default.
2501 do_select_as_default_target()
2503 // No locking is required since there should only be one default target.
2504 // We cannot have both the big-endian and little-endian ARM targets
2506 gold_assert(arm_reloc_property_table == NULL);
2507 arm_reloc_property_table = new Arm_reloc_property_table();
2510 // Virtual function which is set to return true by a target if
2511 // it can use relocation types to determine if a function's
2512 // pointer is taken.
2514 do_can_check_for_function_pointers() const
2517 // Whether a section called SECTION_NAME may have function pointers to
2518 // sections not eligible for safe ICF folding.
2520 do_section_may_have_icf_unsafe_pointers(const char* section_name) const
2522 return (!is_prefix_of(".ARM.exidx", section_name)
2523 && !is_prefix_of(".ARM.extab", section_name)
2524 && Target::do_section_may_have_icf_unsafe_pointers(section_name));
2528 do_define_standard_symbols(Symbol_table*, Layout*);
2530 virtual Output_data_plt_arm<big_endian>*
2531 do_make_data_plt(Layout* layout, Output_data_space* got_plt)
2533 return new Output_data_plt_arm_standard<big_endian>(layout, got_plt);
2537 // The class which scans relocations.
2542 : issued_non_pic_error_(false)
2546 get_reference_flags(unsigned int r_type);
2549 local(Symbol_table* symtab, Layout* layout, Target_arm* target,
2550 Sized_relobj_file<32, big_endian>* object,
2551 unsigned int data_shndx,
2552 Output_section* output_section,
2553 const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
2554 const elfcpp::Sym<32, big_endian>& lsym,
2558 global(Symbol_table* symtab, Layout* layout, Target_arm* target,
2559 Sized_relobj_file<32, big_endian>* object,
2560 unsigned int data_shndx,
2561 Output_section* output_section,
2562 const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type,
2566 local_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_arm* ,
2567 Sized_relobj_file<32, big_endian>* ,
2570 const elfcpp::Rel<32, big_endian>& ,
2572 const elfcpp::Sym<32, big_endian>&);
2575 global_reloc_may_be_function_pointer(Symbol_table* , Layout* , Target_arm* ,
2576 Sized_relobj_file<32, big_endian>* ,
2579 const elfcpp::Rel<32, big_endian>& ,
2580 unsigned int , Symbol*);
2584 unsupported_reloc_local(Sized_relobj_file<32, big_endian>*,
2585 unsigned int r_type);
2588 unsupported_reloc_global(Sized_relobj_file<32, big_endian>*,
2589 unsigned int r_type, Symbol*);
2592 check_non_pic(Relobj*, unsigned int r_type);
2594 // Almost identical to Symbol::needs_plt_entry except that it also
2595 // handles STT_ARM_TFUNC.
2597 symbol_needs_plt_entry(const Symbol* sym)
2599 // An undefined symbol from an executable does not need a PLT entry.
2600 if (sym->is_undefined() && !parameters->options().shared())
2603 return (!parameters->doing_static_link()
2604 && (sym->type() == elfcpp::STT_FUNC
2605 || sym->type() == elfcpp::STT_ARM_TFUNC)
2606 && (sym->is_from_dynobj()
2607 || sym->is_undefined()
2608 || sym->is_preemptible()));
2612 possible_function_pointer_reloc(unsigned int r_type);
2614 // Whether we have issued an error about a non-PIC compilation.
2615 bool issued_non_pic_error_;
2618 // The class which implements relocation.
2628 // Return whether the static relocation needs to be applied.
2630 should_apply_static_reloc(const Sized_symbol<32>* gsym,
2631 unsigned int r_type,
2633 Output_section* output_section);
2635 // Do a relocation. Return false if the caller should not issue
2636 // any warnings about this relocation.
2638 relocate(const Relocate_info<32, big_endian>*, Target_arm*,
2639 Output_section*, size_t relnum,
2640 const elfcpp::Rel<32, big_endian>&,
2641 unsigned int r_type, const Sized_symbol<32>*,
2642 const Symbol_value<32>*,
2643 unsigned char*, Arm_address,
2646 // Return whether we want to pass flag NON_PIC_REF for this
2647 // reloc. This means the relocation type accesses a symbol not via
2650 reloc_is_non_pic(unsigned int r_type)
2654 // These relocation types reference GOT or PLT entries explicitly.
2655 case elfcpp::R_ARM_GOT_BREL:
2656 case elfcpp::R_ARM_GOT_ABS:
2657 case elfcpp::R_ARM_GOT_PREL:
2658 case elfcpp::R_ARM_GOT_BREL12:
2659 case elfcpp::R_ARM_PLT32_ABS:
2660 case elfcpp::R_ARM_TLS_GD32:
2661 case elfcpp::R_ARM_TLS_LDM32:
2662 case elfcpp::R_ARM_TLS_IE32:
2663 case elfcpp::R_ARM_TLS_IE12GP:
2665 // These relocate types may use PLT entries.
2666 case elfcpp::R_ARM_CALL:
2667 case elfcpp::R_ARM_THM_CALL:
2668 case elfcpp::R_ARM_JUMP24:
2669 case elfcpp::R_ARM_THM_JUMP24:
2670 case elfcpp::R_ARM_THM_JUMP19:
2671 case elfcpp::R_ARM_PLT32:
2672 case elfcpp::R_ARM_THM_XPC22:
2673 case elfcpp::R_ARM_PREL31:
2674 case elfcpp::R_ARM_SBREL31:
2683 // Do a TLS relocation.
2684 inline typename Arm_relocate_functions<big_endian>::Status
2685 relocate_tls(const Relocate_info<32, big_endian>*, Target_arm<big_endian>*,
2686 size_t, const elfcpp::Rel<32, big_endian>&, unsigned int,
2687 const Sized_symbol<32>*, const Symbol_value<32>*,
2688 unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
2693 // A class which returns the size required for a relocation type,
2694 // used while scanning relocs during a relocatable link.
2695 class Relocatable_size_for_reloc
2699 get_size_for_reloc(unsigned int, Relobj*);
2702 // Adjust TLS relocation type based on the options and whether this
2703 // is a local symbol.
2704 static tls::Tls_optimization
2705 optimize_tls_reloc(bool is_final, int r_type);
2707 // Get the GOT section, creating it if necessary.
2708 Arm_output_data_got<big_endian>*
2709 got_section(Symbol_table*, Layout*);
2711 // Get the GOT PLT section.
2713 got_plt_section() const
2715 gold_assert(this->got_plt_ != NULL);
2716 return this->got_plt_;
2719 // Create a PLT entry for a global symbol.
2721 make_plt_entry(Symbol_table*, Layout*, Symbol*);
2723 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
2725 define_tls_base_symbol(Symbol_table*, Layout*);
2727 // Create a GOT entry for the TLS module index.
2729 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2730 Sized_relobj_file<32, big_endian>* object);
2732 // Get the PLT section.
2733 const Output_data_plt_arm<big_endian>*
2736 gold_assert(this->plt_ != NULL);
2740 // Get the dynamic reloc section, creating it if necessary.
2742 rel_dyn_section(Layout*);
2744 // Get the section to use for TLS_DESC relocations.
2746 rel_tls_desc_section(Layout*) const;
2748 // Return true if the symbol may need a COPY relocation.
2749 // References from an executable object to non-function symbols
2750 // defined in a dynamic object may need a COPY relocation.
2752 may_need_copy_reloc(Symbol* gsym)
2754 return (gsym->type() != elfcpp::STT_ARM_TFUNC
2755 && gsym->may_need_copy_reloc());
2758 // Add a potential copy relocation.
2760 copy_reloc(Symbol_table* symtab, Layout* layout,
2761 Sized_relobj_file<32, big_endian>* object,
2762 unsigned int shndx, Output_section* output_section,
2763 Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc)
2765 this->copy_relocs_.copy_reloc(symtab, layout,
2766 symtab->get_sized_symbol<32>(sym),
2767 object, shndx, output_section, reloc,
2768 this->rel_dyn_section(layout));
2771 // Whether two EABI versions are compatible.
2773 are_eabi_versions_compatible(elfcpp::Elf_Word v1, elfcpp::Elf_Word v2);
2775 // Merge processor-specific flags from input object and those in the ELF
2776 // header of the output.
2778 merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word);
2780 // Get the secondary compatible architecture.
2782 get_secondary_compatible_arch(const Attributes_section_data*);
2784 // Set the secondary compatible architecture.
2786 set_secondary_compatible_arch(Attributes_section_data*, int);
2789 tag_cpu_arch_combine(const char*, int, int*, int, int);
2791 // Helper to print AEABI enum tag value.
2793 aeabi_enum_name(unsigned int);
2795 // Return string value for TAG_CPU_name.
2797 tag_cpu_name_value(unsigned int);
2799 // Merge object attributes from input object and those in the output.
2801 merge_object_attributes(const char*, const Attributes_section_data*);
2803 // Helper to get an AEABI object attribute
2805 get_aeabi_object_attribute(int tag) const
2807 Attributes_section_data* pasd = this->attributes_section_data_;
2808 gold_assert(pasd != NULL);
2809 Object_attribute* attr =
2810 pasd->get_attribute(Object_attribute::OBJ_ATTR_PROC, tag);
2811 gold_assert(attr != NULL);
2816 // Methods to support stub-generations.
2819 // Group input sections for stub generation.
2821 group_sections(Layout*, section_size_type, bool, const Task*);
2823 // Scan a relocation for stub generation.
2825 scan_reloc_for_stub(const Relocate_info<32, big_endian>*, unsigned int,
2826 const Sized_symbol<32>*, unsigned int,
2827 const Symbol_value<32>*,
2828 elfcpp::Elf_types<32>::Elf_Swxword, Arm_address);
2830 // Scan a relocation section for stub.
2831 template<int sh_type>
2833 scan_reloc_section_for_stubs(
2834 const Relocate_info<32, big_endian>* relinfo,
2835 const unsigned char* prelocs,
2837 Output_section* output_section,
2838 bool needs_special_offset_handling,
2839 const unsigned char* view,
2840 elfcpp::Elf_types<32>::Elf_Addr view_address,
2843 // Fix .ARM.exidx section coverage.
2845 fix_exidx_coverage(Layout*, const Input_objects*,
2846 Arm_output_section<big_endian>*, Symbol_table*,
2849 // Functors for STL set.
2850 struct output_section_address_less_than
2853 operator()(const Output_section* s1, const Output_section* s2) const
2854 { return s1->address() < s2->address(); }
2857 // Information about this specific target which we pass to the
2858 // general Target structure.
2859 static const Target::Target_info arm_info;
2861 // The types of GOT entries needed for this platform.
2862 // These values are exposed to the ABI in an incremental link.
2863 // Do not renumber existing values without changing the version
2864 // number of the .gnu_incremental_inputs section.
2867 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
2868 GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset
2869 GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset
2870 GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair
2871 GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair
2874 typedef typename std::vector<Stub_table<big_endian>*> Stub_table_list;
2876 // Map input section to Arm_input_section.
2877 typedef Unordered_map<Section_id,
2878 Arm_input_section<big_endian>*,
2880 Arm_input_section_map;
2882 // Map output addresses to relocs for Cortex-A8 erratum.
2883 typedef Unordered_map<Arm_address, const Cortex_a8_reloc*>
2884 Cortex_a8_relocs_info;
2887 Arm_output_data_got<big_endian>* got_;
2889 Output_data_plt_arm<big_endian>* plt_;
2890 // The GOT PLT section.
2891 Output_data_space* got_plt_;
2892 // The dynamic reloc section.
2893 Reloc_section* rel_dyn_;
2894 // Relocs saved to avoid a COPY reloc.
2895 Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_;
2896 // Space for variables copied with a COPY reloc.
2897 Output_data_space* dynbss_;
2898 // Offset of the GOT entry for the TLS module index.
2899 unsigned int got_mod_index_offset_;
2900 // True if the _TLS_MODULE_BASE_ symbol has been defined.
2901 bool tls_base_symbol_defined_;
2902 // Vector of Stub_tables created.
2903 Stub_table_list stub_tables_;
2905 const Stub_factory &stub_factory_;
2906 // Whether we force PIC branch veneers.
2907 bool should_force_pic_veneer_;
2908 // Map for locating Arm_input_sections.
2909 Arm_input_section_map arm_input_section_map_;
2910 // Attributes section data in output.
2911 Attributes_section_data* attributes_section_data_;
2912 // Whether we want to fix code for Cortex-A8 erratum.
2913 bool fix_cortex_a8_;
2914 // Map addresses to relocs for Cortex-A8 erratum.
2915 Cortex_a8_relocs_info cortex_a8_relocs_info_;
2918 template<bool big_endian>
2919 const Target::Target_info Target_arm<big_endian>::arm_info =
2922 big_endian, // is_big_endian
2923 elfcpp::EM_ARM, // machine_code
2924 false, // has_make_symbol
2925 false, // has_resolve
2926 false, // has_code_fill
2927 true, // is_default_stack_executable
2928 false, // can_icf_inline_merge_sections
2930 "/usr/lib/libc.so.1", // dynamic_linker
2931 0x8000, // default_text_segment_address
2932 0x1000, // abi_pagesize (overridable by -z max-page-size)
2933 0x1000, // common_pagesize (overridable by -z common-page-size)
2934 false, // isolate_execinstr
2936 elfcpp::SHN_UNDEF, // small_common_shndx
2937 elfcpp::SHN_UNDEF, // large_common_shndx
2938 0, // small_common_section_flags
2939 0, // large_common_section_flags
2940 ".ARM.attributes", // attributes_section
2941 "aeabi" // attributes_vendor
2944 // Arm relocate functions class
2947 template<bool big_endian>
2948 class Arm_relocate_functions : public Relocate_functions<32, big_endian>
2953 STATUS_OKAY, // No error during relocation.
2954 STATUS_OVERFLOW, // Relocation overflow.
2955 STATUS_BAD_RELOC // Relocation cannot be applied.
2959 typedef Relocate_functions<32, big_endian> Base;
2960 typedef Arm_relocate_functions<big_endian> This;
2962 // Encoding of imm16 argument for movt and movw ARM instructions
2965 // imm16 := imm4 | imm12
2967 // 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
2968 // +-------+---------------+-------+-------+-----------------------+
2969 // | | |imm4 | |imm12 |
2970 // +-------+---------------+-------+-------+-----------------------+
2972 // Extract the relocation addend from VAL based on the ARM
2973 // instruction encoding described above.
2974 static inline typename elfcpp::Swap<32, big_endian>::Valtype
2975 extract_arm_movw_movt_addend(
2976 typename elfcpp::Swap<32, big_endian>::Valtype val)
2978 // According to the Elf ABI for ARM Architecture the immediate
2979 // field is sign-extended to form the addend.
2980 return Bits<16>::sign_extend32(((val >> 4) & 0xf000) | (val & 0xfff));
2983 // Insert X into VAL based on the ARM instruction encoding described
2985 static inline typename elfcpp::Swap<32, big_endian>::Valtype
2986 insert_val_arm_movw_movt(
2987 typename elfcpp::Swap<32, big_endian>::Valtype val,
2988 typename elfcpp::Swap<32, big_endian>::Valtype x)
2992 val |= (x & 0xf000) << 4;
2996 // Encoding of imm16 argument for movt and movw Thumb2 instructions
2999 // imm16 := imm4 | i | imm3 | imm8
3001 // 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
3002 // +---------+-+-----------+-------++-+-----+-------+---------------+
3003 // | |i| |imm4 || |imm3 | |imm8 |
3004 // +---------+-+-----------+-------++-+-----+-------+---------------+
3006 // Extract the relocation addend from VAL based on the Thumb2
3007 // instruction encoding described above.
3008 static inline typename elfcpp::Swap<32, big_endian>::Valtype
3009 extract_thumb_movw_movt_addend(
3010 typename elfcpp::Swap<32, big_endian>::Valtype val)
3012 // According to the Elf ABI for ARM Architecture the immediate
3013 // field is sign-extended to form the addend.
3014 return Bits<16>::sign_extend32(((val >> 4) & 0xf000)
3015 | ((val >> 15) & 0x0800)
3016 | ((val >> 4) & 0x0700)
3020 // Insert X into VAL based on the Thumb2 instruction encoding
3022 static inline typename elfcpp::Swap<32, big_endian>::Valtype
3023 insert_val_thumb_movw_movt(
3024 typename elfcpp::Swap<32, big_endian>::Valtype val,
3025 typename elfcpp::Swap<32, big_endian>::Valtype x)
3028 val |= (x & 0xf000) << 4;
3029 val |= (x & 0x0800) << 15;
3030 val |= (x & 0x0700) << 4;
3031 val |= (x & 0x00ff);
3035 // Calculate the smallest constant Kn for the specified residual.
3036 // (see (AAELF 4.6.1.4 Static ARM relocations, Group Relocations, p.32)
3038 calc_grp_kn(typename elfcpp::Swap<32, big_endian>::Valtype residual)
3044 // Determine the most significant bit in the residual and
3045 // align the resulting value to a 2-bit boundary.
3046 for (msb = 30; (msb >= 0) && !(residual & (3 << msb)); msb -= 2)
3048 // The desired shift is now (msb - 6), or zero, whichever
3050 return (((msb - 6) < 0) ? 0 : (msb - 6));
3053 // Calculate the final residual for the specified group index.
3054 // If the passed group index is less than zero, the method will return
3055 // the value of the specified residual without any change.
3056 // (see (AAELF 4.6.1.4 Static ARM relocations, Group Relocations, p.32)
3057 static typename elfcpp::Swap<32, big_endian>::Valtype
3058 calc_grp_residual(typename elfcpp::Swap<32, big_endian>::Valtype residual,
3061 for (int n = 0; n <= group; n++)
3063 // Calculate which part of the value to mask.
3064 uint32_t shift = calc_grp_kn(residual);
3065 // Calculate the residual for the next time around.
3066 residual &= ~(residual & (0xff << shift));
3072 // Calculate the value of Gn for the specified group index.
3073 // We return it in the form of an encoded constant-and-rotation.
3074 // (see (AAELF 4.6.1.4 Static ARM relocations, Group Relocations, p.32)
3075 static typename elfcpp::Swap<32, big_endian>::Valtype
3076 calc_grp_gn(typename elfcpp::Swap<32, big_endian>::Valtype residual,
3079 typename elfcpp::Swap<32, big_endian>::Valtype gn = 0;
3082 for (int n = 0; n <= group; n++)
3084 // Calculate which part of the value to mask.
3085 shift = calc_grp_kn(residual);
3086 // Calculate Gn in 32-bit as well as encoded constant-and-rotation form.
3087 gn = residual & (0xff << shift);
3088 // Calculate the residual for the next time around.
3091 // Return Gn in the form of an encoded constant-and-rotation.
3092 return ((gn >> shift) | ((gn <= 0xff ? 0 : (32 - shift) / 2) << 8));
3096 // Handle ARM long branches.
3097 static typename This::Status
3098 arm_branch_common(unsigned int, const Relocate_info<32, big_endian>*,
3099 unsigned char*, const Sized_symbol<32>*,
3100 const Arm_relobj<big_endian>*, unsigned int,
3101 const Symbol_value<32>*, Arm_address, Arm_address, bool);
3103 // Handle THUMB long branches.
3104 static typename This::Status
3105 thumb_branch_common(unsigned int, const Relocate_info<32, big_endian>*,
3106 unsigned char*, const Sized_symbol<32>*,
3107 const Arm_relobj<big_endian>*, unsigned int,
3108 const Symbol_value<32>*, Arm_address, Arm_address, bool);
3111 // Return the branch offset of a 32-bit THUMB branch.
3112 static inline int32_t
3113 thumb32_branch_offset(uint16_t upper_insn, uint16_t lower_insn)
3115 // We use the Thumb-2 encoding (backwards compatible with Thumb-1)
3116 // involving the J1 and J2 bits.
3117 uint32_t s = (upper_insn & (1U << 10)) >> 10;
3118 uint32_t upper = upper_insn & 0x3ffU;
3119 uint32_t lower = lower_insn & 0x7ffU;
3120 uint32_t j1 = (lower_insn & (1U << 13)) >> 13;
3121 uint32_t j2 = (lower_insn & (1U << 11)) >> 11;
3122 uint32_t i1 = j1 ^ s ? 0 : 1;
3123 uint32_t i2 = j2 ^ s ? 0 : 1;
3125 return Bits<25>::sign_extend32((s << 24) | (i1 << 23) | (i2 << 22)
3126 | (upper << 12) | (lower << 1));
3129 // Insert OFFSET to a 32-bit THUMB branch and return the upper instruction.
3130 // UPPER_INSN is the original upper instruction of the branch. Caller is
3131 // responsible for overflow checking and BLX offset adjustment.
3132 static inline uint16_t
3133 thumb32_branch_upper(uint16_t upper_insn, int32_t offset)
3135 uint32_t s = offset < 0 ? 1 : 0;
3136 uint32_t bits = static_cast<uint32_t>(offset);
3137 return (upper_insn & ~0x7ffU) | ((bits >> 12) & 0x3ffU) | (s << 10);
3140 // Insert OFFSET to a 32-bit THUMB branch and return the lower instruction.
3141 // LOWER_INSN is the original lower instruction of the branch. Caller is
3142 // responsible for overflow checking and BLX offset adjustment.
3143 static inline uint16_t
3144 thumb32_branch_lower(uint16_t lower_insn, int32_t offset)
3146 uint32_t s = offset < 0 ? 1 : 0;
3147 uint32_t bits = static_cast<uint32_t>(offset);
3148 return ((lower_insn & ~0x2fffU)
3149 | ((((bits >> 23) & 1) ^ !s) << 13)
3150 | ((((bits >> 22) & 1) ^ !s) << 11)
3151 | ((bits >> 1) & 0x7ffU));
3154 // Return the branch offset of a 32-bit THUMB conditional branch.
3155 static inline int32_t
3156 thumb32_cond_branch_offset(uint16_t upper_insn, uint16_t lower_insn)
3158 uint32_t s = (upper_insn & 0x0400U) >> 10;
3159 uint32_t j1 = (lower_insn & 0x2000U) >> 13;
3160 uint32_t j2 = (lower_insn & 0x0800U) >> 11;
3161 uint32_t lower = (lower_insn & 0x07ffU);
3162 uint32_t upper = (s << 8) | (j2 << 7) | (j1 << 6) | (upper_insn & 0x003fU);
3164 return Bits<21>::sign_extend32((upper << 12) | (lower << 1));
3167 // Insert OFFSET to a 32-bit THUMB conditional branch and return the upper
3168 // instruction. UPPER_INSN is the original upper instruction of the branch.
3169 // Caller is responsible for overflow checking.
3170 static inline uint16_t
3171 thumb32_cond_branch_upper(uint16_t upper_insn, int32_t offset)
3173 uint32_t s = offset < 0 ? 1 : 0;
3174 uint32_t bits = static_cast<uint32_t>(offset);
3175 return (upper_insn & 0xfbc0U) | (s << 10) | ((bits & 0x0003f000U) >> 12);
3178 // Insert OFFSET to a 32-bit THUMB conditional branch and return the lower
3179 // instruction. LOWER_INSN is the original lower instruction of the branch.
3180 // The caller is responsible for overflow checking.
3181 static inline uint16_t
3182 thumb32_cond_branch_lower(uint16_t lower_insn, int32_t offset)
3184 uint32_t bits = static_cast<uint32_t>(offset);
3185 uint32_t j2 = (bits & 0x00080000U) >> 19;
3186 uint32_t j1 = (bits & 0x00040000U) >> 18;
3187 uint32_t lo = (bits & 0x00000ffeU) >> 1;
3189 return (lower_insn & 0xd000U) | (j1 << 13) | (j2 << 11) | lo;
3192 // R_ARM_ABS8: S + A
3193 static inline typename This::Status
3194 abs8(unsigned char* view,
3195 const Sized_relobj_file<32, big_endian>* object,
3196 const Symbol_value<32>* psymval)
3198 typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype;
3199 Valtype* wv = reinterpret_cast<Valtype*>(view);
3200 Valtype val = elfcpp::Swap<8, big_endian>::readval(wv);
3201 int32_t addend = Bits<8>::sign_extend32(val);
3202 Arm_address x = psymval->value(object, addend);
3203 val = Bits<32>::bit_select32(val, x, 0xffU);
3204 elfcpp::Swap<8, big_endian>::writeval(wv, val);
3206 // R_ARM_ABS8 permits signed or unsigned results.
3207 return (Bits<8>::has_signed_unsigned_overflow32(x)
3208 ? This::STATUS_OVERFLOW
3209 : This::STATUS_OKAY);
3212 // R_ARM_THM_ABS5: S + A
3213 static inline typename This::Status
3214 thm_abs5(unsigned char* view,
3215 const Sized_relobj_file<32, big_endian>* object,
3216 const Symbol_value<32>* psymval)
3218 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3219 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3220 Valtype* wv = reinterpret_cast<Valtype*>(view);
3221 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3222 Reltype addend = (val & 0x7e0U) >> 6;
3223 Reltype x = psymval->value(object, addend);
3224 val = Bits<32>::bit_select32(val, x << 6, 0x7e0U);
3225 elfcpp::Swap<16, big_endian>::writeval(wv, val);
3226 return (Bits<5>::has_overflow32(x)
3227 ? This::STATUS_OVERFLOW
3228 : This::STATUS_OKAY);
3231 // R_ARM_ABS12: S + A
3232 static inline typename This::Status
3233 abs12(unsigned char* view,
3234 const Sized_relobj_file<32, big_endian>* object,
3235 const Symbol_value<32>* psymval)
3237 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3238 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3239 Valtype* wv = reinterpret_cast<Valtype*>(view);
3240 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3241 Reltype addend = val & 0x0fffU;
3242 Reltype x = psymval->value(object, addend);
3243 val = Bits<32>::bit_select32(val, x, 0x0fffU);
3244 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3245 return (Bits<12>::has_overflow32(x)
3246 ? This::STATUS_OVERFLOW
3247 : This::STATUS_OKAY);
3250 // R_ARM_ABS16: S + A
3251 static inline typename This::Status
3252 abs16(unsigned char* view,
3253 const Sized_relobj_file<32, big_endian>* object,
3254 const Symbol_value<32>* psymval)
3256 typedef typename elfcpp::Swap_unaligned<16, big_endian>::Valtype Valtype;
3257 Valtype val = elfcpp::Swap_unaligned<16, big_endian>::readval(view);
3258 int32_t addend = Bits<16>::sign_extend32(val);
3259 Arm_address x = psymval->value(object, addend);
3260 val = Bits<32>::bit_select32(val, x, 0xffffU);
3261 elfcpp::Swap_unaligned<16, big_endian>::writeval(view, val);
3263 // R_ARM_ABS16 permits signed or unsigned results.
3264 return (Bits<16>::has_signed_unsigned_overflow32(x)
3265 ? This::STATUS_OVERFLOW
3266 : This::STATUS_OKAY);
3269 // R_ARM_ABS32: (S + A) | T
3270 static inline typename This::Status
3271 abs32(unsigned char* view,
3272 const Sized_relobj_file<32, big_endian>* object,
3273 const Symbol_value<32>* psymval,
3274 Arm_address thumb_bit)
3276 typedef typename elfcpp::Swap_unaligned<32, big_endian>::Valtype Valtype;
3277 Valtype addend = elfcpp::Swap_unaligned<32, big_endian>::readval(view);
3278 Valtype x = psymval->value(object, addend) | thumb_bit;
3279 elfcpp::Swap_unaligned<32, big_endian>::writeval(view, x);
3280 return This::STATUS_OKAY;
3283 // R_ARM_REL32: (S + A) | T - P
3284 static inline typename This::Status
3285 rel32(unsigned char* view,
3286 const Sized_relobj_file<32, big_endian>* object,
3287 const Symbol_value<32>* psymval,
3288 Arm_address address,
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) - address;
3294 elfcpp::Swap_unaligned<32, big_endian>::writeval(view, x);
3295 return This::STATUS_OKAY;
3298 // R_ARM_THM_JUMP24: (S + A) | T - P
3299 static typename This::Status
3300 thm_jump19(unsigned char* view, const Arm_relobj<big_endian>* object,
3301 const Symbol_value<32>* psymval, Arm_address address,
3302 Arm_address thumb_bit);
3304 // R_ARM_THM_JUMP6: S + A – P
3305 static inline typename This::Status
3306 thm_jump6(unsigned char* view,
3307 const Sized_relobj_file<32, big_endian>* object,
3308 const Symbol_value<32>* psymval,
3309 Arm_address address)
3311 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3312 typedef typename elfcpp::Swap<16, big_endian>::Valtype Reltype;
3313 Valtype* wv = reinterpret_cast<Valtype*>(view);
3314 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3315 // bit[9]:bit[7:3]:’0’ (mask: 0x02f8)
3316 Reltype addend = (((val & 0x0200) >> 3) | ((val & 0x00f8) >> 2));
3317 Reltype x = (psymval->value(object, addend) - address);
3318 val = (val & 0xfd07) | ((x & 0x0040) << 3) | ((val & 0x003e) << 2);
3319 elfcpp::Swap<16, big_endian>::writeval(wv, val);
3320 // CZB does only forward jumps.
3321 return ((x > 0x007e)
3322 ? This::STATUS_OVERFLOW
3323 : This::STATUS_OKAY);
3326 // R_ARM_THM_JUMP8: S + A – P
3327 static inline typename This::Status
3328 thm_jump8(unsigned char* view,
3329 const Sized_relobj_file<32, big_endian>* object,
3330 const Symbol_value<32>* psymval,
3331 Arm_address address)
3333 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3334 Valtype* wv = reinterpret_cast<Valtype*>(view);
3335 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3336 int32_t addend = Bits<8>::sign_extend32((val & 0x00ff) << 1);
3337 int32_t x = (psymval->value(object, addend) - address);
3338 elfcpp::Swap<16, big_endian>::writeval(wv, ((val & 0xff00)
3339 | ((x & 0x01fe) >> 1)));
3340 // We do a 9-bit overflow check because x is right-shifted by 1 bit.
3341 return (Bits<9>::has_overflow32(x)
3342 ? This::STATUS_OVERFLOW
3343 : This::STATUS_OKAY);
3346 // R_ARM_THM_JUMP11: S + A – P
3347 static inline typename This::Status
3348 thm_jump11(unsigned char* view,
3349 const Sized_relobj_file<32, big_endian>* object,
3350 const Symbol_value<32>* psymval,
3351 Arm_address address)
3353 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3354 Valtype* wv = reinterpret_cast<Valtype*>(view);
3355 Valtype val = elfcpp::Swap<16, big_endian>::readval(wv);
3356 int32_t addend = Bits<11>::sign_extend32((val & 0x07ff) << 1);
3357 int32_t x = (psymval->value(object, addend) - address);
3358 elfcpp::Swap<16, big_endian>::writeval(wv, ((val & 0xf800)
3359 | ((x & 0x0ffe) >> 1)));
3360 // We do a 12-bit overflow check because x is right-shifted by 1 bit.
3361 return (Bits<12>::has_overflow32(x)
3362 ? This::STATUS_OVERFLOW
3363 : This::STATUS_OKAY);
3366 // R_ARM_BASE_PREL: B(S) + A - P
3367 static inline typename This::Status
3368 base_prel(unsigned char* view,
3370 Arm_address address)
3372 Base::rel32(view, origin - address);
3376 // R_ARM_BASE_ABS: B(S) + A
3377 static inline typename This::Status
3378 base_abs(unsigned char* view,
3381 Base::rel32(view, origin);
3385 // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG
3386 static inline typename This::Status
3387 got_brel(unsigned char* view,
3388 typename elfcpp::Swap<32, big_endian>::Valtype got_offset)
3390 Base::rel32(view, got_offset);
3391 return This::STATUS_OKAY;
3394 // R_ARM_GOT_PREL: GOT(S) + A - P
3395 static inline typename This::Status
3396 got_prel(unsigned char* view,
3397 Arm_address got_entry,
3398 Arm_address address)
3400 Base::rel32(view, got_entry - address);
3401 return This::STATUS_OKAY;
3404 // R_ARM_PREL: (S + A) | T - P
3405 static inline typename This::Status
3406 prel31(unsigned char* view,
3407 const Sized_relobj_file<32, big_endian>* object,
3408 const Symbol_value<32>* psymval,
3409 Arm_address address,
3410 Arm_address thumb_bit)
3412 typedef typename elfcpp::Swap_unaligned<32, big_endian>::Valtype Valtype;
3413 Valtype val = elfcpp::Swap_unaligned<32, big_endian>::readval(view);
3414 Valtype addend = Bits<31>::sign_extend32(val);
3415 Valtype x = (psymval->value(object, addend) | thumb_bit) - address;
3416 val = Bits<32>::bit_select32(val, x, 0x7fffffffU);
3417 elfcpp::Swap_unaligned<32, big_endian>::writeval(view, val);
3418 return (Bits<31>::has_overflow32(x)
3419 ? This::STATUS_OVERFLOW
3420 : This::STATUS_OKAY);
3423 // R_ARM_MOVW_ABS_NC: (S + A) | T (relative address base is )
3424 // R_ARM_MOVW_PREL_NC: (S + A) | T - P
3425 // R_ARM_MOVW_BREL_NC: ((S + A) | T) - B(S)
3426 // R_ARM_MOVW_BREL: ((S + A) | T) - B(S)
3427 static inline typename This::Status
3428 movw(unsigned char* view,
3429 const Sized_relobj_file<32, big_endian>* object,
3430 const Symbol_value<32>* psymval,
3431 Arm_address relative_address_base,
3432 Arm_address thumb_bit,
3433 bool check_overflow)
3435 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3436 Valtype* wv = reinterpret_cast<Valtype*>(view);
3437 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3438 Valtype addend = This::extract_arm_movw_movt_addend(val);
3439 Valtype x = ((psymval->value(object, addend) | thumb_bit)
3440 - relative_address_base);
3441 val = This::insert_val_arm_movw_movt(val, x);
3442 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3443 return ((check_overflow && Bits<16>::has_overflow32(x))
3444 ? This::STATUS_OVERFLOW
3445 : This::STATUS_OKAY);
3448 // R_ARM_MOVT_ABS: S + A (relative address base is 0)
3449 // R_ARM_MOVT_PREL: S + A - P
3450 // R_ARM_MOVT_BREL: S + A - B(S)
3451 static inline typename This::Status
3452 movt(unsigned char* view,
3453 const Sized_relobj_file<32, big_endian>* object,
3454 const Symbol_value<32>* psymval,
3455 Arm_address relative_address_base)
3457 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3458 Valtype* wv = reinterpret_cast<Valtype*>(view);
3459 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3460 Valtype addend = This::extract_arm_movw_movt_addend(val);
3461 Valtype x = (psymval->value(object, addend) - relative_address_base) >> 16;
3462 val = This::insert_val_arm_movw_movt(val, x);
3463 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3464 // FIXME: IHI0044D says that we should check for overflow.
3465 return This::STATUS_OKAY;
3468 // R_ARM_THM_MOVW_ABS_NC: S + A | T (relative_address_base is 0)
3469 // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P
3470 // R_ARM_THM_MOVW_BREL_NC: ((S + A) | T) - B(S)
3471 // R_ARM_THM_MOVW_BREL: ((S + A) | T) - B(S)
3472 static inline typename This::Status
3473 thm_movw(unsigned char* view,
3474 const Sized_relobj_file<32, big_endian>* object,
3475 const Symbol_value<32>* psymval,
3476 Arm_address relative_address_base,
3477 Arm_address thumb_bit,
3478 bool check_overflow)
3480 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3481 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3482 Valtype* wv = reinterpret_cast<Valtype*>(view);
3483 Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3484 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3485 Reltype addend = This::extract_thumb_movw_movt_addend(val);
3487 (psymval->value(object, addend) | thumb_bit) - relative_address_base;
3488 val = This::insert_val_thumb_movw_movt(val, x);
3489 elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16);
3490 elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff);
3491 return ((check_overflow && Bits<16>::has_overflow32(x))
3492 ? This::STATUS_OVERFLOW
3493 : This::STATUS_OKAY);
3496 // R_ARM_THM_MOVT_ABS: S + A (relative address base is 0)
3497 // R_ARM_THM_MOVT_PREL: S + A - P
3498 // R_ARM_THM_MOVT_BREL: S + A - B(S)
3499 static inline typename This::Status
3500 thm_movt(unsigned char* view,
3501 const Sized_relobj_file<32, big_endian>* object,
3502 const Symbol_value<32>* psymval,
3503 Arm_address relative_address_base)
3505 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3506 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3507 Valtype* wv = reinterpret_cast<Valtype*>(view);
3508 Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3509 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3510 Reltype addend = This::extract_thumb_movw_movt_addend(val);
3511 Reltype x = (psymval->value(object, addend) - relative_address_base) >> 16;
3512 val = This::insert_val_thumb_movw_movt(val, x);
3513 elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16);
3514 elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff);
3515 return This::STATUS_OKAY;
3518 // R_ARM_THM_ALU_PREL_11_0: ((S + A) | T) - Pa (Thumb32)
3519 static inline typename This::Status
3520 thm_alu11(unsigned char* view,
3521 const Sized_relobj_file<32, big_endian>* object,
3522 const Symbol_value<32>* psymval,
3523 Arm_address address,
3524 Arm_address thumb_bit)
3526 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3527 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3528 Valtype* wv = reinterpret_cast<Valtype*>(view);
3529 Reltype insn = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3530 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3532 // 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
3533 // -----------------------------------------------------------------------
3534 // ADD{S} 1 1 1 1 0|i|0|1 0 0 0|S|1 1 0 1||0|imm3 |Rd |imm8
3535 // ADDW 1 1 1 1 0|i|1|0 0 0 0|0|1 1 0 1||0|imm3 |Rd |imm8
3536 // ADR[+] 1 1 1 1 0|i|1|0 0 0 0|0|1 1 1 1||0|imm3 |Rd |imm8
3537 // SUB{S} 1 1 1 1 0|i|0|1 1 0 1|S|1 1 0 1||0|imm3 |Rd |imm8
3538 // SUBW 1 1 1 1 0|i|1|0 1 0 1|0|1 1 0 1||0|imm3 |Rd |imm8
3539 // ADR[-] 1 1 1 1 0|i|1|0 1 0 1|0|1 1 1 1||0|imm3 |Rd |imm8
3541 // Determine a sign for the addend.
3542 const int sign = ((insn & 0xf8ef0000) == 0xf0ad0000
3543 || (insn & 0xf8ef0000) == 0xf0af0000) ? -1 : 1;
3544 // Thumb2 addend encoding:
3545 // imm12 := i | imm3 | imm8
3546 int32_t addend = (insn & 0xff)
3547 | ((insn & 0x00007000) >> 4)
3548 | ((insn & 0x04000000) >> 15);
3549 // Apply a sign to the added.
3552 int32_t x = (psymval->value(object, addend) | thumb_bit)
3553 - (address & 0xfffffffc);
3554 Reltype val = abs(x);
3555 // Mask out the value and a distinct part of the ADD/SUB opcode
3556 // (bits 7:5 of opword).
3557 insn = (insn & 0xfb0f8f00)
3559 | ((val & 0x700) << 4)
3560 | ((val & 0x800) << 15);
3561 // Set the opcode according to whether the value to go in the
3562 // place is negative.
3566 elfcpp::Swap<16, big_endian>::writeval(wv, insn >> 16);
3567 elfcpp::Swap<16, big_endian>::writeval(wv + 1, insn & 0xffff);
3568 return ((val > 0xfff) ?
3569 This::STATUS_OVERFLOW : This::STATUS_OKAY);
3572 // R_ARM_THM_PC8: S + A - Pa (Thumb)
3573 static inline typename This::Status
3574 thm_pc8(unsigned char* view,
3575 const Sized_relobj_file<32, big_endian>* object,
3576 const Symbol_value<32>* psymval,
3577 Arm_address address)
3579 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3580 typedef typename elfcpp::Swap<16, big_endian>::Valtype Reltype;
3581 Valtype* wv = reinterpret_cast<Valtype*>(view);
3582 Valtype insn = elfcpp::Swap<16, big_endian>::readval(wv);
3583 Reltype addend = ((insn & 0x00ff) << 2);
3584 int32_t x = (psymval->value(object, addend) - (address & 0xfffffffc));
3585 Reltype val = abs(x);
3586 insn = (insn & 0xff00) | ((val & 0x03fc) >> 2);
3588 elfcpp::Swap<16, big_endian>::writeval(wv, insn);
3589 return ((val > 0x03fc)
3590 ? This::STATUS_OVERFLOW
3591 : This::STATUS_OKAY);
3594 // R_ARM_THM_PC12: S + A - Pa (Thumb32)
3595 static inline typename This::Status
3596 thm_pc12(unsigned char* view,
3597 const Sized_relobj_file<32, big_endian>* object,
3598 const Symbol_value<32>* psymval,
3599 Arm_address address)
3601 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3602 typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype;
3603 Valtype* wv = reinterpret_cast<Valtype*>(view);
3604 Reltype insn = (elfcpp::Swap<16, big_endian>::readval(wv) << 16)
3605 | elfcpp::Swap<16, big_endian>::readval(wv + 1);
3606 // Determine a sign for the addend (positive if the U bit is 1).
3607 const int sign = (insn & 0x00800000) ? 1 : -1;
3608 int32_t addend = (insn & 0xfff);
3609 // Apply a sign to the added.
3612 int32_t x = (psymval->value(object, addend) - (address & 0xfffffffc));
3613 Reltype val = abs(x);
3614 // Mask out and apply the value and the U bit.
3615 insn = (insn & 0xff7ff000) | (val & 0xfff);
3616 // Set the U bit according to whether the value to go in the
3617 // place is positive.
3621 elfcpp::Swap<16, big_endian>::writeval(wv, insn >> 16);
3622 elfcpp::Swap<16, big_endian>::writeval(wv + 1, insn & 0xffff);
3623 return ((val > 0xfff) ?
3624 This::STATUS_OVERFLOW : This::STATUS_OKAY);
3628 static inline typename This::Status
3629 v4bx(const Relocate_info<32, big_endian>* relinfo,
3630 unsigned char* view,
3631 const Arm_relobj<big_endian>* object,
3632 const Arm_address address,
3633 const bool is_interworking)
3636 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3637 Valtype* wv = reinterpret_cast<Valtype*>(view);
3638 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3640 // Ensure that we have a BX instruction.
3641 gold_assert((val & 0x0ffffff0) == 0x012fff10);
3642 const uint32_t reg = (val & 0xf);
3643 if (is_interworking && reg != 0xf)
3645 Stub_table<big_endian>* stub_table =
3646 object->stub_table(relinfo->data_shndx);
3647 gold_assert(stub_table != NULL);
3649 Arm_v4bx_stub* stub = stub_table->find_arm_v4bx_stub(reg);
3650 gold_assert(stub != NULL);
3652 int32_t veneer_address =
3653 stub_table->address() + stub->offset() - 8 - address;
3654 gold_assert((veneer_address <= ARM_MAX_FWD_BRANCH_OFFSET)
3655 && (veneer_address >= ARM_MAX_BWD_BRANCH_OFFSET));
3656 // Replace with a branch to veneer (B <addr>)
3657 val = (val & 0xf0000000) | 0x0a000000
3658 | ((veneer_address >> 2) & 0x00ffffff);
3662 // Preserve Rm (lowest four bits) and the condition code
3663 // (highest four bits). Other bits encode MOV PC,Rm.
3664 val = (val & 0xf000000f) | 0x01a0f000;
3666 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3667 return This::STATUS_OKAY;
3670 // R_ARM_ALU_PC_G0_NC: ((S + A) | T) - P
3671 // R_ARM_ALU_PC_G0: ((S + A) | T) - P
3672 // R_ARM_ALU_PC_G1_NC: ((S + A) | T) - P
3673 // R_ARM_ALU_PC_G1: ((S + A) | T) - P
3674 // R_ARM_ALU_PC_G2: ((S + A) | T) - P
3675 // R_ARM_ALU_SB_G0_NC: ((S + A) | T) - B(S)
3676 // R_ARM_ALU_SB_G0: ((S + A) | T) - B(S)
3677 // R_ARM_ALU_SB_G1_NC: ((S + A) | T) - B(S)
3678 // R_ARM_ALU_SB_G1: ((S + A) | T) - B(S)
3679 // R_ARM_ALU_SB_G2: ((S + A) | T) - B(S)
3680 static inline typename This::Status
3681 arm_grp_alu(unsigned char* view,
3682 const Sized_relobj_file<32, big_endian>* object,
3683 const Symbol_value<32>* psymval,
3685 Arm_address address,
3686 Arm_address thumb_bit,
3687 bool check_overflow)
3689 gold_assert(group >= 0 && group < 3);
3690 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3691 Valtype* wv = reinterpret_cast<Valtype*>(view);
3692 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3694 // ALU group relocations are allowed only for the ADD/SUB instructions.
3695 // (0x00800000 - ADD, 0x00400000 - SUB)
3696 const Valtype opcode = insn & 0x01e00000;
3697 if (opcode != 0x00800000 && opcode != 0x00400000)
3698 return This::STATUS_BAD_RELOC;
3700 // Determine a sign for the addend.
3701 const int sign = (opcode == 0x00800000) ? 1 : -1;
3702 // shifter = rotate_imm * 2
3703 const uint32_t shifter = (insn & 0xf00) >> 7;
3704 // Initial addend value.
3705 int32_t addend = insn & 0xff;
3706 // Rotate addend right by shifter.
3707 addend = (addend >> shifter) | (addend << (32 - shifter));
3708 // Apply a sign to the added.
3711 int32_t x = ((psymval->value(object, addend) | thumb_bit) - address);
3712 Valtype gn = Arm_relocate_functions::calc_grp_gn(abs(x), group);
3713 // Check for overflow if required
3715 && (Arm_relocate_functions::calc_grp_residual(abs(x), group) != 0))
3716 return This::STATUS_OVERFLOW;
3718 // Mask out the value and the ADD/SUB part of the opcode; take care
3719 // not to destroy the S bit.
3721 // Set the opcode according to whether the value to go in the
3722 // place is negative.
3723 insn |= ((x < 0) ? 0x00400000 : 0x00800000);
3724 // Encode the offset (encoded Gn).
3727 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3728 return This::STATUS_OKAY;
3731 // R_ARM_LDR_PC_G0: S + A - P
3732 // R_ARM_LDR_PC_G1: S + A - P
3733 // R_ARM_LDR_PC_G2: S + A - P
3734 // R_ARM_LDR_SB_G0: S + A - B(S)
3735 // R_ARM_LDR_SB_G1: S + A - B(S)
3736 // R_ARM_LDR_SB_G2: S + A - B(S)
3737 static inline typename This::Status
3738 arm_grp_ldr(unsigned char* view,
3739 const Sized_relobj_file<32, big_endian>* object,
3740 const Symbol_value<32>* psymval,
3742 Arm_address address)
3744 gold_assert(group >= 0 && group < 3);
3745 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3746 Valtype* wv = reinterpret_cast<Valtype*>(view);
3747 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3749 const int sign = (insn & 0x00800000) ? 1 : -1;
3750 int32_t addend = (insn & 0xfff) * sign;
3751 int32_t x = (psymval->value(object, addend) - address);
3752 // Calculate the relevant G(n-1) value to obtain this stage residual.
3754 Arm_relocate_functions::calc_grp_residual(abs(x), group - 1);
3755 if (residual >= 0x1000)
3756 return This::STATUS_OVERFLOW;
3758 // Mask out the value and U bit.
3760 // Set the U bit for non-negative values.
3765 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3766 return This::STATUS_OKAY;
3769 // R_ARM_LDRS_PC_G0: S + A - P
3770 // R_ARM_LDRS_PC_G1: S + A - P
3771 // R_ARM_LDRS_PC_G2: S + A - P
3772 // R_ARM_LDRS_SB_G0: S + A - B(S)
3773 // R_ARM_LDRS_SB_G1: S + A - B(S)
3774 // R_ARM_LDRS_SB_G2: S + A - B(S)
3775 static inline typename This::Status
3776 arm_grp_ldrs(unsigned char* view,
3777 const Sized_relobj_file<32, big_endian>* object,
3778 const Symbol_value<32>* psymval,
3780 Arm_address address)
3782 gold_assert(group >= 0 && group < 3);
3783 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3784 Valtype* wv = reinterpret_cast<Valtype*>(view);
3785 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3787 const int sign = (insn & 0x00800000) ? 1 : -1;
3788 int32_t addend = (((insn & 0xf00) >> 4) + (insn & 0xf)) * sign;
3789 int32_t x = (psymval->value(object, addend) - address);
3790 // Calculate the relevant G(n-1) value to obtain this stage residual.
3792 Arm_relocate_functions::calc_grp_residual(abs(x), group - 1);
3793 if (residual >= 0x100)
3794 return This::STATUS_OVERFLOW;
3796 // Mask out the value and U bit.
3798 // Set the U bit for non-negative values.
3801 insn |= ((residual & 0xf0) << 4) | (residual & 0xf);
3803 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3804 return This::STATUS_OKAY;
3807 // R_ARM_LDC_PC_G0: S + A - P
3808 // R_ARM_LDC_PC_G1: S + A - P
3809 // R_ARM_LDC_PC_G2: S + A - P
3810 // R_ARM_LDC_SB_G0: S + A - B(S)
3811 // R_ARM_LDC_SB_G1: S + A - B(S)
3812 // R_ARM_LDC_SB_G2: S + A - B(S)
3813 static inline typename This::Status
3814 arm_grp_ldc(unsigned char* view,
3815 const Sized_relobj_file<32, big_endian>* object,
3816 const Symbol_value<32>* psymval,
3818 Arm_address address)
3820 gold_assert(group >= 0 && group < 3);
3821 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3822 Valtype* wv = reinterpret_cast<Valtype*>(view);
3823 Valtype insn = elfcpp::Swap<32, big_endian>::readval(wv);
3825 const int sign = (insn & 0x00800000) ? 1 : -1;
3826 int32_t addend = ((insn & 0xff) << 2) * sign;
3827 int32_t x = (psymval->value(object, addend) - address);
3828 // Calculate the relevant G(n-1) value to obtain this stage residual.
3830 Arm_relocate_functions::calc_grp_residual(abs(x), group - 1);
3831 if ((residual & 0x3) != 0 || residual >= 0x400)
3832 return This::STATUS_OVERFLOW;
3834 // Mask out the value and U bit.
3836 // Set the U bit for non-negative values.
3839 insn |= (residual >> 2);
3841 elfcpp::Swap<32, big_endian>::writeval(wv, insn);
3842 return This::STATUS_OKAY;
3846 // Relocate ARM long branches. This handles relocation types
3847 // R_ARM_CALL, R_ARM_JUMP24, R_ARM_PLT32 and R_ARM_XPC25.
3848 // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly
3849 // undefined and we do not use PLT in this relocation. In such a case,
3850 // the branch is converted into an NOP.
3852 template<bool big_endian>
3853 typename Arm_relocate_functions<big_endian>::Status
3854 Arm_relocate_functions<big_endian>::arm_branch_common(
3855 unsigned int r_type,
3856 const Relocate_info<32, big_endian>* relinfo,
3857 unsigned char* view,
3858 const Sized_symbol<32>* gsym,
3859 const Arm_relobj<big_endian>* object,
3861 const Symbol_value<32>* psymval,
3862 Arm_address address,
3863 Arm_address thumb_bit,
3864 bool is_weakly_undefined_without_plt)
3866 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
3867 Valtype* wv = reinterpret_cast<Valtype*>(view);
3868 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
3870 bool insn_is_b = (((val >> 28) & 0xf) <= 0xe)
3871 && ((val & 0x0f000000UL) == 0x0a000000UL);
3872 bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL;
3873 bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe)
3874 && ((val & 0x0f000000UL) == 0x0b000000UL);
3875 bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL;
3876 bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL;
3878 // Check that the instruction is valid.
3879 if (r_type == elfcpp::R_ARM_CALL)
3881 if (!insn_is_uncond_bl && !insn_is_blx)
3882 return This::STATUS_BAD_RELOC;
3884 else if (r_type == elfcpp::R_ARM_JUMP24)
3886 if (!insn_is_b && !insn_is_cond_bl)
3887 return This::STATUS_BAD_RELOC;
3889 else if (r_type == elfcpp::R_ARM_PLT32)
3891 if (!insn_is_any_branch)
3892 return This::STATUS_BAD_RELOC;
3894 else if (r_type == elfcpp::R_ARM_XPC25)
3896 // FIXME: AAELF document IH0044C does not say much about it other
3897 // than it being obsolete.
3898 if (!insn_is_any_branch)
3899 return This::STATUS_BAD_RELOC;
3904 // A branch to an undefined weak symbol is turned into a jump to
3905 // the next instruction unless a PLT entry will be created.
3906 // Do the same for local undefined symbols.
3907 // The jump to the next instruction is optimized as a NOP depending
3908 // on the architecture.
3909 const Target_arm<big_endian>* arm_target =
3910 Target_arm<big_endian>::default_target();
3911 if (is_weakly_undefined_without_plt)
3913 gold_assert(!parameters->options().relocatable());
3914 Valtype cond = val & 0xf0000000U;
3915 if (arm_target->may_use_arm_nop())
3916 val = cond | 0x0320f000;
3918 val = cond | 0x01a00000; // Using pre-UAL nop: mov r0, r0.
3919 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3920 return This::STATUS_OKAY;
3923 Valtype addend = Bits<26>::sign_extend32(val << 2);
3924 Valtype branch_target = psymval->value(object, addend);
3925 int32_t branch_offset = branch_target - address;
3927 // We need a stub if the branch offset is too large or if we need
3929 bool may_use_blx = arm_target->may_use_v5t_interworking();
3930 Reloc_stub* stub = NULL;
3932 if (!parameters->options().relocatable()
3933 && (Bits<26>::has_overflow32(branch_offset)
3934 || ((thumb_bit != 0)
3935 && !(may_use_blx && r_type == elfcpp::R_ARM_CALL))))
3937 Valtype unadjusted_branch_target = psymval->value(object, 0);
3939 Stub_type stub_type =
3940 Reloc_stub::stub_type_for_reloc(r_type, address,
3941 unadjusted_branch_target,
3943 if (stub_type != arm_stub_none)
3945 Stub_table<big_endian>* stub_table =
3946 object->stub_table(relinfo->data_shndx);
3947 gold_assert(stub_table != NULL);
3949 Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
3950 stub = stub_table->find_reloc_stub(stub_key);
3951 gold_assert(stub != NULL);
3952 thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0;
3953 branch_target = stub_table->address() + stub->offset() + addend;
3954 branch_offset = branch_target - address;
3955 gold_assert(!Bits<26>::has_overflow32(branch_offset));
3959 // At this point, if we still need to switch mode, the instruction
3960 // must either be a BLX or a BL that can be converted to a BLX.
3964 gold_assert(may_use_blx && r_type == elfcpp::R_ARM_CALL);
3965 val = (val & 0xffffff) | 0xfa000000 | ((branch_offset & 2) << 23);
3968 val = Bits<32>::bit_select32(val, (branch_offset >> 2), 0xffffffUL);
3969 elfcpp::Swap<32, big_endian>::writeval(wv, val);
3970 return (Bits<26>::has_overflow32(branch_offset)
3971 ? This::STATUS_OVERFLOW
3972 : This::STATUS_OKAY);
3975 // Relocate THUMB long branches. This handles relocation types
3976 // R_ARM_THM_CALL, R_ARM_THM_JUMP24 and R_ARM_THM_XPC22.
3977 // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly
3978 // undefined and we do not use PLT in this relocation. In such a case,
3979 // the branch is converted into an NOP.
3981 template<bool big_endian>
3982 typename Arm_relocate_functions<big_endian>::Status
3983 Arm_relocate_functions<big_endian>::thumb_branch_common(
3984 unsigned int r_type,
3985 const Relocate_info<32, big_endian>* relinfo,
3986 unsigned char* view,
3987 const Sized_symbol<32>* gsym,
3988 const Arm_relobj<big_endian>* object,
3990 const Symbol_value<32>* psymval,
3991 Arm_address address,
3992 Arm_address thumb_bit,
3993 bool is_weakly_undefined_without_plt)
3995 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
3996 Valtype* wv = reinterpret_cast<Valtype*>(view);
3997 uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
3998 uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
4000 // FIXME: These tests are too loose and do not take THUMB/THUMB-2 difference
4002 bool is_bl_insn = (lower_insn & 0x1000U) == 0x1000U;
4003 bool is_blx_insn = (lower_insn & 0x1000U) == 0x0000U;
4005 // Check that the instruction is valid.
4006 if (r_type == elfcpp::R_ARM_THM_CALL)
4008 if (!is_bl_insn && !is_blx_insn)
4009 return This::STATUS_BAD_RELOC;
4011 else if (r_type == elfcpp::R_ARM_THM_JUMP24)
4013 // This cannot be a BLX.
4015 return This::STATUS_BAD_RELOC;
4017 else if (r_type == elfcpp::R_ARM_THM_XPC22)
4019 // Check for Thumb to Thumb call.
4021 return This::STATUS_BAD_RELOC;
4024 gold_warning(_("%s: Thumb BLX instruction targets "
4025 "thumb function '%s'."),
4026 object->name().c_str(),
4027 (gsym ? gsym->name() : "(local)"));
4028 // Convert BLX to BL.
4029 lower_insn |= 0x1000U;
4035 // A branch to an undefined weak symbol is turned into a jump to
4036 // the next instruction unless a PLT entry will be created.
4037 // The jump to the next instruction is optimized as a NOP.W for
4038 // Thumb-2 enabled architectures.
4039 const Target_arm<big_endian>* arm_target =
4040 Target_arm<big_endian>::default_target();
4041 if (is_weakly_undefined_without_plt)
4043 gold_assert(!parameters->options().relocatable());
4044 if (arm_target->may_use_thumb2_nop())
4046 elfcpp::Swap<16, big_endian>::writeval(wv, 0xf3af);
4047 elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0x8000);
4051 elfcpp::Swap<16, big_endian>::writeval(wv, 0xe000);
4052 elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0xbf00);
4054 return This::STATUS_OKAY;
4057 int32_t addend = This::thumb32_branch_offset(upper_insn, lower_insn);
4058 Arm_address branch_target = psymval->value(object, addend);
4060 // For BLX, bit 1 of target address comes from bit 1 of base address.
4061 bool may_use_blx = arm_target->may_use_v5t_interworking();
4062 if (thumb_bit == 0 && may_use_blx)
4063 branch_target = Bits<32>::bit_select32(branch_target, address, 0x2);
4065 int32_t branch_offset = branch_target - address;
4067 // We need a stub if the branch offset is too large or if we need
4069 bool thumb2 = arm_target->using_thumb2();
4070 if (!parameters->options().relocatable()
4071 && ((!thumb2 && Bits<23>::has_overflow32(branch_offset))
4072 || (thumb2 && Bits<25>::has_overflow32(branch_offset))
4073 || ((thumb_bit == 0)
4074 && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx)
4075 || r_type == elfcpp::R_ARM_THM_JUMP24))))
4077 Arm_address unadjusted_branch_target = psymval->value(object, 0);
4079 Stub_type stub_type =
4080 Reloc_stub::stub_type_for_reloc(r_type, address,
4081 unadjusted_branch_target,
4084 if (stub_type != arm_stub_none)
4086 Stub_table<big_endian>* stub_table =
4087 object->stub_table(relinfo->data_shndx);
4088 gold_assert(stub_table != NULL);
4090 Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
4091 Reloc_stub* stub = stub_table->find_reloc_stub(stub_key);
4092 gold_assert(stub != NULL);
4093 thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0;
4094 branch_target = stub_table->address() + stub->offset() + addend;
4095 if (thumb_bit == 0 && may_use_blx)
4096 branch_target = Bits<32>::bit_select32(branch_target, address, 0x2);
4097 branch_offset = branch_target - address;
4101 // At this point, if we still need to switch mode, the instruction
4102 // must either be a BLX or a BL that can be converted to a BLX.
4105 gold_assert(may_use_blx
4106 && (r_type == elfcpp::R_ARM_THM_CALL
4107 || r_type == elfcpp::R_ARM_THM_XPC22));
4108 // Make sure this is a BLX.
4109 lower_insn &= ~0x1000U;
4113 // Make sure this is a BL.
4114 lower_insn |= 0x1000U;
4117 // For a BLX instruction, make sure that the relocation is rounded up
4118 // to a word boundary. This follows the semantics of the instruction
4119 // which specifies that bit 1 of the target address will come from bit
4120 // 1 of the base address.
4121 if ((lower_insn & 0x5000U) == 0x4000U)
4122 gold_assert((branch_offset & 3) == 0);
4124 // Put BRANCH_OFFSET back into the insn. Assumes two's complement.
4125 // We use the Thumb-2 encoding, which is safe even if dealing with
4126 // a Thumb-1 instruction by virtue of our overflow check above. */
4127 upper_insn = This::thumb32_branch_upper(upper_insn, branch_offset);
4128 lower_insn = This::thumb32_branch_lower(lower_insn, branch_offset);
4130 elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn);
4131 elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn);
4133 gold_assert(!Bits<25>::has_overflow32(branch_offset));
4136 ? Bits<25>::has_overflow32(branch_offset)
4137 : Bits<23>::has_overflow32(branch_offset))
4138 ? This::STATUS_OVERFLOW
4139 : This::STATUS_OKAY);
4142 // Relocate THUMB-2 long conditional branches.
4143 // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly
4144 // undefined and we do not use PLT in this relocation. In such a case,
4145 // the branch is converted into an NOP.
4147 template<bool big_endian>
4148 typename Arm_relocate_functions<big_endian>::Status
4149 Arm_relocate_functions<big_endian>::thm_jump19(
4150 unsigned char* view,
4151 const Arm_relobj<big_endian>* object,
4152 const Symbol_value<32>* psymval,
4153 Arm_address address,
4154 Arm_address thumb_bit)
4156 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
4157 Valtype* wv = reinterpret_cast<Valtype*>(view);
4158 uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
4159 uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
4160 int32_t addend = This::thumb32_cond_branch_offset(upper_insn, lower_insn);
4162 Arm_address branch_target = psymval->value(object, addend);
4163 int32_t branch_offset = branch_target - address;
4165 // ??? Should handle interworking? GCC might someday try to
4166 // use this for tail calls.
4167 // FIXME: We do support thumb entry to PLT yet.
4170 gold_error(_("conditional branch to PLT in THUMB-2 not supported yet."));
4171 return This::STATUS_BAD_RELOC;
4174 // Put RELOCATION back into the insn.
4175 upper_insn = This::thumb32_cond_branch_upper(upper_insn, branch_offset);
4176 lower_insn = This::thumb32_cond_branch_lower(lower_insn, branch_offset);
4178 // Put the relocated value back in the object file:
4179 elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn);
4180 elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn);
4182 return (Bits<21>::has_overflow32(branch_offset)
4183 ? This::STATUS_OVERFLOW
4184 : This::STATUS_OKAY);
4187 // Get the GOT section, creating it if necessary.
4189 template<bool big_endian>
4190 Arm_output_data_got<big_endian>*
4191 Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout)
4193 if (this->got_ == NULL)
4195 gold_assert(symtab != NULL && layout != NULL);
4197 // When using -z now, we can treat .got as a relro section.
4198 // Without -z now, it is modified after program startup by lazy
4200 bool is_got_relro = parameters->options().now();
4201 Output_section_order got_order = (is_got_relro
4205 // Unlike some targets (.e.g x86), ARM does not use separate .got and
4206 // .got.plt sections in output. The output .got section contains both
4207 // PLT and non-PLT GOT entries.
4208 this->got_ = new Arm_output_data_got<big_endian>(symtab, layout);
4210 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
4211 (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
4212 this->got_, got_order, is_got_relro);
4214 // The old GNU linker creates a .got.plt section. We just
4215 // create another set of data in the .got section. Note that we
4216 // always create a PLT if we create a GOT, although the PLT
4218 this->got_plt_ = new Output_data_space(4, "** GOT PLT");
4219 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
4220 (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
4221 this->got_plt_, got_order, is_got_relro);
4223 // The first three entries are reserved.
4224 this->got_plt_->set_current_data_size(3 * 4);
4226 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
4227 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
4228 Symbol_table::PREDEFINED,
4230 0, 0, elfcpp::STT_OBJECT,
4232 elfcpp::STV_HIDDEN, 0,
4238 // Get the dynamic reloc section, creating it if necessary.
4240 template<bool big_endian>
4241 typename Target_arm<big_endian>::Reloc_section*
4242 Target_arm<big_endian>::rel_dyn_section(Layout* layout)
4244 if (this->rel_dyn_ == NULL)
4246 gold_assert(layout != NULL);
4247 this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
4248 layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
4249 elfcpp::SHF_ALLOC, this->rel_dyn_,
4250 ORDER_DYNAMIC_RELOCS, false);
4252 return this->rel_dyn_;
4255 // Insn_template methods.
4257 // Return byte size of an instruction template.
4260 Insn_template::size() const
4262 switch (this->type())
4265 case THUMB16_SPECIAL_TYPE:
4276 // Return alignment of an instruction template.
4279 Insn_template::alignment() const
4281 switch (this->type())
4284 case THUMB16_SPECIAL_TYPE:
4295 // Stub_template methods.
4297 Stub_template::Stub_template(
4298 Stub_type type, const Insn_template* insns,
4300 : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1),
4301 entry_in_thumb_mode_(false), relocs_()
4305 // Compute byte size and alignment of stub template.
4306 for (size_t i = 0; i < insn_count; i++)
4308 unsigned insn_alignment = insns[i].alignment();
4309 size_t insn_size = insns[i].size();
4310 gold_assert((offset & (insn_alignment - 1)) == 0);
4311 this->alignment_ = std::max(this->alignment_, insn_alignment);
4312 switch (insns[i].type())
4314 case Insn_template::THUMB16_TYPE:
4315 case Insn_template::THUMB16_SPECIAL_TYPE:
4317 this->entry_in_thumb_mode_ = true;
4320 case Insn_template::THUMB32_TYPE:
4321 if (insns[i].r_type() != elfcpp::R_ARM_NONE)
4322 this->relocs_.push_back(Reloc(i, offset));
4324 this->entry_in_thumb_mode_ = true;
4327 case Insn_template::ARM_TYPE:
4328 // Handle cases where the target is encoded within the
4330 if (insns[i].r_type() == elfcpp::R_ARM_JUMP24)
4331 this->relocs_.push_back(Reloc(i, offset));
4334 case Insn_template::DATA_TYPE:
4335 // Entry point cannot be data.
4336 gold_assert(i != 0);
4337 this->relocs_.push_back(Reloc(i, offset));
4343 offset += insn_size;
4345 this->size_ = offset;
4350 // Template to implement do_write for a specific target endianness.
4352 template<bool big_endian>
4354 Stub::do_fixed_endian_write(unsigned char* view, section_size_type view_size)
4356 const Stub_template* stub_template = this->stub_template();
4357 const Insn_template* insns = stub_template->insns();
4359 // FIXME: We do not handle BE8 encoding yet.
4360 unsigned char* pov = view;
4361 for (size_t i = 0; i < stub_template->insn_count(); i++)
4363 switch (insns[i].type())
4365 case Insn_template::THUMB16_TYPE:
4366 elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff);
4368 case Insn_template::THUMB16_SPECIAL_TYPE:
4369 elfcpp::Swap<16, big_endian>::writeval(
4371 this->thumb16_special(i));
4373 case Insn_template::THUMB32_TYPE:
4375 uint32_t hi = (insns[i].data() >> 16) & 0xffff;
4376 uint32_t lo = insns[i].data() & 0xffff;
4377 elfcpp::Swap<16, big_endian>::writeval(pov, hi);
4378 elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo);
4381 case Insn_template::ARM_TYPE:
4382 case Insn_template::DATA_TYPE:
4383 elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data());
4388 pov += insns[i].size();
4390 gold_assert(static_cast<section_size_type>(pov - view) == view_size);
4393 // Reloc_stub::Key methods.
4395 // Dump a Key as a string for debugging.
4398 Reloc_stub::Key::name() const
4400 if (this->r_sym_ == invalid_index)
4402 // Global symbol key name
4403 // <stub-type>:<symbol name>:<addend>.
4404 const std::string sym_name = this->u_.symbol->name();
4405 // We need to print two hex number and two colons. So just add 100 bytes
4406 // to the symbol name size.
4407 size_t len = sym_name.size() + 100;
4408 char* buffer = new char[len];
4409 int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_,
4410 sym_name.c_str(), this->addend_);
4411 gold_assert(c > 0 && c < static_cast<int>(len));
4413 return std::string(buffer);
4417 // local symbol key name
4418 // <stub-type>:<object>:<r_sym>:<addend>.
4419 const size_t len = 200;
4421 int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_,
4422 this->u_.relobj, this->r_sym_, this->addend_);
4423 gold_assert(c > 0 && c < static_cast<int>(len));
4424 return std::string(buffer);
4428 // Reloc_stub methods.
4430 // Determine the type of stub needed, if any, for a relocation of R_TYPE at
4431 // LOCATION to DESTINATION.
4432 // This code is based on the arm_type_of_stub function in
4433 // bfd/elf32-arm.c. We have changed the interface a little to keep the Stub
4437 Reloc_stub::stub_type_for_reloc(
4438 unsigned int r_type,
4439 Arm_address location,
4440 Arm_address destination,
4441 bool target_is_thumb)
4443 Stub_type stub_type = arm_stub_none;
4445 // This is a bit ugly but we want to avoid using a templated class for
4446 // big and little endianities.
4448 bool should_force_pic_veneer;
4451 if (parameters->target().is_big_endian())
4453 const Target_arm<true>* big_endian_target =
4454 Target_arm<true>::default_target();
4455 may_use_blx = big_endian_target->may_use_v5t_interworking();
4456 should_force_pic_veneer = big_endian_target->should_force_pic_veneer();
4457 thumb2 = big_endian_target->using_thumb2();
4458 thumb_only = big_endian_target->using_thumb_only();
4462 const Target_arm<false>* little_endian_target =
4463 Target_arm<false>::default_target();
4464 may_use_blx = little_endian_target->may_use_v5t_interworking();
4465 should_force_pic_veneer = little_endian_target->should_force_pic_veneer();
4466 thumb2 = little_endian_target->using_thumb2();
4467 thumb_only = little_endian_target->using_thumb_only();
4470 int64_t branch_offset;
4471 bool output_is_position_independent =
4472 parameters->options().output_is_position_independent();
4473 if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24)
4475 // For THUMB BLX instruction, bit 1 of target comes from bit 1 of the
4476 // base address (instruction address + 4).
4477 if ((r_type == elfcpp::R_ARM_THM_CALL) && may_use_blx && !target_is_thumb)
4478 destination = Bits<32>::bit_select32(destination, location, 0x2);
4479 branch_offset = static_cast<int64_t>(destination) - location;
4481 // Handle cases where:
4482 // - this call goes too far (different Thumb/Thumb2 max
4484 // - it's a Thumb->Arm call and blx is not available, or it's a
4485 // Thumb->Arm branch (not bl). A stub is needed in this case.
4487 && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET
4488 || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET)))
4490 && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET
4491 || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET)))
4492 || ((!target_is_thumb)
4493 && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx)
4494 || (r_type == elfcpp::R_ARM_THM_JUMP24))))
4496 if (target_is_thumb)
4501 stub_type = (output_is_position_independent
4502 || should_force_pic_veneer)
4505 && (r_type == elfcpp::R_ARM_THM_CALL))
4506 // V5T and above. Stub starts with ARM code, so
4507 // we must be able to switch mode before
4508 // reaching it, which is only possible for 'bl'
4509 // (ie R_ARM_THM_CALL relocation).
4510 ? arm_stub_long_branch_any_thumb_pic
4511 // On V4T, use Thumb code only.
4512 : arm_stub_long_branch_v4t_thumb_thumb_pic)
4516 && (r_type == elfcpp::R_ARM_THM_CALL))
4517 ? arm_stub_long_branch_any_any // V5T and above.
4518 : arm_stub_long_branch_v4t_thumb_thumb); // V4T.
4522 stub_type = (output_is_position_independent
4523 || should_force_pic_veneer)
4524 ? arm_stub_long_branch_thumb_only_pic // PIC stub.
4525 : arm_stub_long_branch_thumb_only; // non-PIC stub.
4532 // FIXME: We should check that the input section is from an
4533 // object that has interwork enabled.
4535 stub_type = (output_is_position_independent
4536 || should_force_pic_veneer)
4539 && (r_type == elfcpp::R_ARM_THM_CALL))
4540 ? arm_stub_long_branch_any_arm_pic // V5T and above.
4541 : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T.
4545 && (r_type == elfcpp::R_ARM_THM_CALL))
4546 ? arm_stub_long_branch_any_any // V5T and above.
4547 : arm_stub_long_branch_v4t_thumb_arm); // V4T.
4549 // Handle v4t short branches.
4550 if ((stub_type == arm_stub_long_branch_v4t_thumb_arm)
4551 && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET)
4552 && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET))
4553 stub_type = arm_stub_short_branch_v4t_thumb_arm;
4557 else if (r_type == elfcpp::R_ARM_CALL
4558 || r_type == elfcpp::R_ARM_JUMP24
4559 || r_type == elfcpp::R_ARM_PLT32)
4561 branch_offset = static_cast<int64_t>(destination) - location;
4562 if (target_is_thumb)
4566 // FIXME: We should check that the input section is from an
4567 // object that has interwork enabled.
4569 // We have an extra 2-bytes reach because of
4570 // the mode change (bit 24 (H) of BLX encoding).
4571 if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2)
4572 || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)
4573 || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx)
4574 || (r_type == elfcpp::R_ARM_JUMP24)
4575 || (r_type == elfcpp::R_ARM_PLT32))
4577 stub_type = (output_is_position_independent
4578 || should_force_pic_veneer)
4581 ? arm_stub_long_branch_any_thumb_pic// V5T and above.
4582 : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub.
4586 ? arm_stub_long_branch_any_any // V5T and above.
4587 : arm_stub_long_branch_v4t_arm_thumb); // V4T.
4593 if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET
4594 || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET))
4596 stub_type = (output_is_position_independent
4597 || should_force_pic_veneer)
4598 ? arm_stub_long_branch_any_arm_pic // PIC stubs.
4599 : arm_stub_long_branch_any_any; /// non-PIC.
4607 // Cortex_a8_stub methods.
4609 // Return the instruction for a THUMB16_SPECIAL_TYPE instruction template.
4610 // I is the position of the instruction template in the stub template.
4613 Cortex_a8_stub::do_thumb16_special(size_t i)
4615 // The only use of this is to copy condition code from a conditional
4616 // branch being worked around to the corresponding conditional branch in
4618 gold_assert(this->stub_template()->type() == arm_stub_a8_veneer_b_cond
4620 uint16_t data = this->stub_template()->insns()[i].data();
4621 gold_assert((data & 0xff00U) == 0xd000U);
4622 data |= ((this->original_insn_ >> 22) & 0xf) << 8;
4626 // Stub_factory methods.
4628 Stub_factory::Stub_factory()
4630 // The instruction template sequences are declared as static
4631 // objects and initialized first time the constructor runs.
4633 // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx
4634 // to reach the stub if necessary.
4635 static const Insn_template elf32_arm_stub_long_branch_any_any[] =
4637 Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4]
4638 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4639 // dcd R_ARM_ABS32(X)
4642 // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not
4644 static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] =
4646 Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0]
4647 Insn_template::arm_insn(0xe12fff1c), // bx ip
4648 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4649 // dcd R_ARM_ABS32(X)
4652 // Thumb -> Thumb long branch stub. Used on M-profile architectures.
4653 static const Insn_template elf32_arm_stub_long_branch_thumb_only[] =
4655 Insn_template::thumb16_insn(0xb401), // push {r0}
4656 Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8]
4657 Insn_template::thumb16_insn(0x4684), // mov ip, r0
4658 Insn_template::thumb16_insn(0xbc01), // pop {r0}
4659 Insn_template::thumb16_insn(0x4760), // bx ip
4660 Insn_template::thumb16_insn(0xbf00), // nop
4661 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4662 // dcd R_ARM_ABS32(X)
4665 // V4T Thumb -> Thumb long branch stub. Using the stack is not
4667 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] =
4669 Insn_template::thumb16_insn(0x4778), // bx pc
4670 Insn_template::thumb16_insn(0x46c0), // nop
4671 Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0]
4672 Insn_template::arm_insn(0xe12fff1c), // bx ip
4673 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4674 // dcd R_ARM_ABS32(X)
4677 // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not
4679 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] =
4681 Insn_template::thumb16_insn(0x4778), // bx pc
4682 Insn_template::thumb16_insn(0x46c0), // nop
4683 Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4]
4684 Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0),
4685 // dcd R_ARM_ABS32(X)
4688 // V4T Thumb -> ARM short branch stub. Shorter variant of the above
4689 // one, when the destination is close enough.
4690 static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] =
4692 Insn_template::thumb16_insn(0x4778), // bx pc
4693 Insn_template::thumb16_insn(0x46c0), // nop
4694 Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8)
4697 // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use
4698 // blx to reach the stub if necessary.
4699 static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] =
4701 Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc]
4702 Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip
4703 Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4),
4704 // dcd R_ARM_REL32(X-4)
4707 // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use
4708 // blx to reach the stub if necessary. We can not add into pc;
4709 // it is not guaranteed to mode switch (different in ARMv6 and
4711 static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] =
4713 Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4]
4714 Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip
4715 Insn_template::arm_insn(0xe12fff1c), // bx ip
4716 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0),
4717 // dcd R_ARM_REL32(X)
4720 // V4T ARM -> ARM long branch stub, PIC.
4721 static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] =
4723 Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4]
4724 Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip
4725 Insn_template::arm_insn(0xe12fff1c), // bx ip
4726 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0),
4727 // dcd R_ARM_REL32(X)
4730 // V4T Thumb -> ARM long branch stub, PIC.
4731 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] =
4733 Insn_template::thumb16_insn(0x4778), // bx pc
4734 Insn_template::thumb16_insn(0x46c0), // nop
4735 Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0]
4736 Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc
4737 Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4),
4738 // dcd R_ARM_REL32(X)
4741 // Thumb -> Thumb long branch stub, PIC. Used on M-profile
4743 static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] =
4745 Insn_template::thumb16_insn(0xb401), // push {r0}
4746 Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8]
4747 Insn_template::thumb16_insn(0x46fc), // mov ip, pc
4748 Insn_template::thumb16_insn(0x4484), // add ip, r0
4749 Insn_template::thumb16_insn(0xbc01), // pop {r0}
4750 Insn_template::thumb16_insn(0x4760), // bx ip
4751 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4),
4752 // dcd R_ARM_REL32(X)
4755 // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not
4757 static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] =
4759 Insn_template::thumb16_insn(0x4778), // bx pc
4760 Insn_template::thumb16_insn(0x46c0), // nop
4761 Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4]
4762 Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip
4763 Insn_template::arm_insn(0xe12fff1c), // bx ip
4764 Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0),
4765 // dcd R_ARM_REL32(X)
4768 // Cortex-A8 erratum-workaround stubs.
4770 // Stub used for conditional branches (which may be beyond +/-1MB away,
4771 // so we can't use a conditional branch to reach this stub).
4778 static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] =
4780 Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true
4781 Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after
4782 Insn_template::thumb32_b_insn(0xf000b800, -4) // true:
4786 // Stub used for b.w and bl.w instructions.
4788 static const Insn_template elf32_arm_stub_a8_veneer_b[] =
4790 Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest
4793 static const Insn_template elf32_arm_stub_a8_veneer_bl[] =
4795 Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest
4798 // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w
4799 // instruction (which switches to ARM mode) to point to this stub. Jump to
4800 // the real destination using an ARM-mode branch.
4801 static const Insn_template elf32_arm_stub_a8_veneer_blx[] =
4803 Insn_template::arm_rel_insn(0xea000000, -8) // b dest
4806 // Stub used to provide an interworking for R_ARM_V4BX relocation
4807 // (bx r[n] instruction).
4808 static const Insn_template elf32_arm_stub_v4_veneer_bx[] =
4810 Insn_template::arm_insn(0xe3100001), // tst r<n>, #1
4811 Insn_template::arm_insn(0x01a0f000), // moveq pc, r<n>
4812 Insn_template::arm_insn(0xe12fff10) // bx r<n>
4815 // Fill in the stub template look-up table. Stub templates are constructed
4816 // per instance of Stub_factory for fast look-up without locking
4817 // in a thread-enabled environment.
4819 this->stub_templates_[arm_stub_none] =
4820 new Stub_template(arm_stub_none, NULL, 0);
4822 #define DEF_STUB(x) \
4826 = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \
4827 Stub_type type = arm_stub_##x; \
4828 this->stub_templates_[type] = \
4829 new Stub_template(type, elf32_arm_stub_##x, array_size); \
4837 // Stub_table methods.
4839 // Remove all Cortex-A8 stub.
4841 template<bool big_endian>
4843 Stub_table<big_endian>::remove_all_cortex_a8_stubs()
4845 for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin();
4846 p != this->cortex_a8_stubs_.end();
4849 this->cortex_a8_stubs_.clear();
4852 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
4854 template<bool big_endian>
4856 Stub_table<big_endian>::relocate_stub(
4858 const Relocate_info<32, big_endian>* relinfo,
4859 Target_arm<big_endian>* arm_target,
4860 Output_section* output_section,
4861 unsigned char* view,
4862 Arm_address address,
4863 section_size_type view_size)
4865 const Stub_template* stub_template = stub->stub_template();
4866 if (stub_template->reloc_count() != 0)
4868 // Adjust view to cover the stub only.
4869 section_size_type offset = stub->offset();
4870 section_size_type stub_size = stub_template->size();
4871 gold_assert(offset + stub_size <= view_size);
4873 arm_target->relocate_stub(stub, relinfo, output_section, view + offset,
4874 address + offset, stub_size);
4878 // Relocate all stubs in this stub table.
4880 template<bool big_endian>
4882 Stub_table<big_endian>::relocate_stubs(
4883 const Relocate_info<32, big_endian>* relinfo,
4884 Target_arm<big_endian>* arm_target,
4885 Output_section* output_section,
4886 unsigned char* view,
4887 Arm_address address,
4888 section_size_type view_size)
4890 // If we are passed a view bigger than the stub table's. we need to
4892 gold_assert(address == this->address()
4894 == static_cast<section_size_type>(this->data_size())));
4896 // Relocate all relocation stubs.
4897 for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
4898 p != this->reloc_stubs_.end();
4900 this->relocate_stub(p->second, relinfo, arm_target, output_section, view,
4901 address, view_size);
4903 // Relocate all Cortex-A8 stubs.
4904 for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin();
4905 p != this->cortex_a8_stubs_.end();
4907 this->relocate_stub(p->second, relinfo, arm_target, output_section, view,
4908 address, view_size);
4910 // Relocate all ARM V4BX stubs.
4911 for (Arm_v4bx_stub_list::iterator p = this->arm_v4bx_stubs_.begin();
4912 p != this->arm_v4bx_stubs_.end();
4916 this->relocate_stub(*p, relinfo, arm_target, output_section, view,
4917 address, view_size);
4921 // Write out the stubs to file.
4923 template<bool big_endian>
4925 Stub_table<big_endian>::do_write(Output_file* of)
4927 off_t offset = this->offset();
4928 const section_size_type oview_size =
4929 convert_to_section_size_type(this->data_size());
4930 unsigned char* const oview = of->get_output_view(offset, oview_size);
4932 // Write relocation stubs.
4933 for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
4934 p != this->reloc_stubs_.end();
4937 Reloc_stub* stub = p->second;
4938 Arm_address address = this->address() + stub->offset();
4940 == align_address(address,
4941 stub->stub_template()->alignment()));
4942 stub->write(oview + stub->offset(), stub->stub_template()->size(),
4946 // Write Cortex-A8 stubs.
4947 for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin();
4948 p != this->cortex_a8_stubs_.end();
4951 Cortex_a8_stub* stub = p->second;
4952 Arm_address address = this->address() + stub->offset();
4954 == align_address(address,
4955 stub->stub_template()->alignment()));
4956 stub->write(oview + stub->offset(), stub->stub_template()->size(),
4960 // Write ARM V4BX relocation stubs.
4961 for (Arm_v4bx_stub_list::const_iterator p = this->arm_v4bx_stubs_.begin();
4962 p != this->arm_v4bx_stubs_.end();
4968 Arm_address address = this->address() + (*p)->offset();
4970 == align_address(address,
4971 (*p)->stub_template()->alignment()));
4972 (*p)->write(oview + (*p)->offset(), (*p)->stub_template()->size(),
4976 of->write_output_view(this->offset(), oview_size, oview);
4979 // Update the data size and address alignment of the stub table at the end
4980 // of a relaxation pass. Return true if either the data size or the
4981 // alignment changed in this relaxation pass.
4983 template<bool big_endian>
4985 Stub_table<big_endian>::update_data_size_and_addralign()
4987 // Go over all stubs in table to compute data size and address alignment.
4988 off_t size = this->reloc_stubs_size_;
4989 unsigned addralign = this->reloc_stubs_addralign_;
4991 for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin();
4992 p != this->cortex_a8_stubs_.end();
4995 const Stub_template* stub_template = p->second->stub_template();
4996 addralign = std::max(addralign, stub_template->alignment());
4997 size = (align_address(size, stub_template->alignment())
4998 + stub_template->size());
5001 for (Arm_v4bx_stub_list::const_iterator p = this->arm_v4bx_stubs_.begin();
5002 p != this->arm_v4bx_stubs_.end();
5008 const Stub_template* stub_template = (*p)->stub_template();
5009 addralign = std::max(addralign, stub_template->alignment());
5010 size = (align_address(size, stub_template->alignment())
5011 + stub_template->size());
5014 // Check if either data size or alignment changed in this pass.
5015 // Update prev_data_size_ and prev_addralign_. These will be used
5016 // as the current data size and address alignment for the next pass.
5017 bool changed = size != this->prev_data_size_;
5018 this->prev_data_size_ = size;
5020 if (addralign != this->prev_addralign_)
5022 this->prev_addralign_ = addralign;
5027 // Finalize the stubs. This sets the offsets of the stubs within the stub
5028 // table. It also marks all input sections needing Cortex-A8 workaround.
5030 template<bool big_endian>
5032 Stub_table<big_endian>::finalize_stubs()
5034 off_t off = this->reloc_stubs_size_;
5035 for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin();
5036 p != this->cortex_a8_stubs_.end();
5039 Cortex_a8_stub* stub = p->second;
5040 const Stub_template* stub_template = stub->stub_template();
5041 uint64_t stub_addralign = stub_template->alignment();
5042 off = align_address(off, stub_addralign);
5043 stub->set_offset(off);
5044 off += stub_template->size();
5046 // Mark input section so that we can determine later if a code section
5047 // needs the Cortex-A8 workaround quickly.
5048 Arm_relobj<big_endian>* arm_relobj =
5049 Arm_relobj<big_endian>::as_arm_relobj(stub->relobj());
5050 arm_relobj->mark_section_for_cortex_a8_workaround(stub->shndx());
5053 for (Arm_v4bx_stub_list::const_iterator p = this->arm_v4bx_stubs_.begin();
5054 p != this->arm_v4bx_stubs_.end();
5060 const Stub_template* stub_template = (*p)->stub_template();
5061 uint64_t stub_addralign = stub_template->alignment();
5062 off = align_address(off, stub_addralign);
5063 (*p)->set_offset(off);
5064 off += stub_template->size();
5067 gold_assert(off <= this->prev_data_size_);
5070 // Apply Cortex-A8 workaround to an address range between VIEW_ADDRESS
5071 // and VIEW_ADDRESS + VIEW_SIZE - 1. VIEW points to the mapped address
5072 // of the address range seen by the linker.
5074 template<bool big_endian>
5076 Stub_table<big_endian>::apply_cortex_a8_workaround_to_address_range(
5077 Target_arm<big_endian>* arm_target,
5078 unsigned char* view,
5079 Arm_address view_address,
5080 section_size_type view_size)
5082 // Cortex-A8 stubs are sorted by addresses of branches being fixed up.
5083 for (Cortex_a8_stub_list::const_iterator p =
5084 this->cortex_a8_stubs_.lower_bound(view_address);
5085 ((p != this->cortex_a8_stubs_.end())
5086 && (p->first < (view_address + view_size)));
5089 // We do not store the THUMB bit in the LSB of either the branch address
5090 // or the stub offset. There is no need to strip the LSB.
5091 Arm_address branch_address = p->first;
5092 const Cortex_a8_stub* stub = p->second;
5093 Arm_address stub_address = this->address() + stub->offset();
5095 // Offset of the branch instruction relative to this view.
5096 section_size_type offset =
5097 convert_to_section_size_type(branch_address - view_address);
5098 gold_assert((offset + 4) <= view_size);
5100 arm_target->apply_cortex_a8_workaround(stub, stub_address,
5101 view + offset, branch_address);
5105 // Arm_input_section methods.
5107 // Initialize an Arm_input_section.
5109 template<bool big_endian>
5111 Arm_input_section<big_endian>::init()
5113 Relobj* relobj = this->relobj();
5114 unsigned int shndx = this->shndx();
5116 // We have to cache original size, alignment and contents to avoid locking
5117 // the original file.
5118 this->original_addralign_ =
5119 convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx));
5121 // This is not efficient but we expect only a small number of relaxed
5122 // input sections for stubs.
5123 section_size_type section_size;
5124 const unsigned char* section_contents =
5125 relobj->section_contents(shndx, §ion_size, false);
5126 this->original_size_ =
5127 convert_types<uint32_t, uint64_t>(relobj->section_size(shndx));
5129 gold_assert(this->original_contents_ == NULL);
5130 this->original_contents_ = new unsigned char[section_size];
5131 memcpy(this->original_contents_, section_contents, section_size);
5133 // We want to make this look like the original input section after
5134 // output sections are finalized.
5135 Output_section* os = relobj->output_section(shndx);
5136 off_t offset = relobj->output_section_offset(shndx);
5137 gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx));
5138 this->set_address(os->address() + offset);
5139 this->set_file_offset(os->offset() + offset);
5141 this->set_current_data_size(this->original_size_);
5142 this->finalize_data_size();
5145 template<bool big_endian>
5147 Arm_input_section<big_endian>::do_write(Output_file* of)
5149 // We have to write out the original section content.
5150 gold_assert(this->original_contents_ != NULL);
5151 of->write(this->offset(), this->original_contents_,
5152 this->original_size_);
5154 // If this owns a stub table and it is not empty, write it.
5155 if (this->is_stub_table_owner() && !this->stub_table_->empty())
5156 this->stub_table_->write(of);
5159 // Finalize data size.
5161 template<bool big_endian>
5163 Arm_input_section<big_endian>::set_final_data_size()
5165 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
5167 if (this->is_stub_table_owner())
5169 this->stub_table_->finalize_data_size();
5170 off = align_address(off, this->stub_table_->addralign());
5171 off += this->stub_table_->data_size();
5173 this->set_data_size(off);
5176 // Reset address and file offset.
5178 template<bool big_endian>
5180 Arm_input_section<big_endian>::do_reset_address_and_file_offset()
5182 // Size of the original input section contents.
5183 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
5185 // If this is a stub table owner, account for the stub table size.
5186 if (this->is_stub_table_owner())
5188 Stub_table<big_endian>* stub_table = this->stub_table_;
5190 // Reset the stub table's address and file offset. The
5191 // current data size for child will be updated after that.
5192 stub_table_->reset_address_and_file_offset();
5193 off = align_address(off, stub_table_->addralign());
5194 off += stub_table->current_data_size();
5197 this->set_current_data_size(off);
5200 // Arm_exidx_cantunwind methods.
5202 // Write this to Output file OF for a fixed endianness.
5204 template<bool big_endian>
5206 Arm_exidx_cantunwind::do_fixed_endian_write(Output_file* of)
5208 off_t offset = this->offset();
5209 const section_size_type oview_size = 8;
5210 unsigned char* const oview = of->get_output_view(offset, oview_size);
5212 Output_section* os = this->relobj_->output_section(this->shndx_);
5213 gold_assert(os != NULL);
5215 Arm_relobj<big_endian>* arm_relobj =
5216 Arm_relobj<big_endian>::as_arm_relobj(this->relobj_);
5217 Arm_address output_offset =
5218 arm_relobj->get_output_section_offset(this->shndx_);
5219 Arm_address section_start;
5220 section_size_type section_size;
5222 // Find out the end of the text section referred by this.
5223 if (output_offset != Arm_relobj<big_endian>::invalid_address)
5225 section_start = os->address() + output_offset;
5226 const Arm_exidx_input_section* exidx_input_section =
5227 arm_relobj->exidx_input_section_by_link(this->shndx_);
5228 gold_assert(exidx_input_section != NULL);
5230 convert_to_section_size_type(exidx_input_section->text_size());
5234 // Currently this only happens for a relaxed section.
5235 const Output_relaxed_input_section* poris =
5236 os->find_relaxed_input_section(this->relobj_, this->shndx_);
5237 gold_assert(poris != NULL);
5238 section_start = poris->address();
5239 section_size = convert_to_section_size_type(poris->data_size());
5242 // We always append this to the end of an EXIDX section.
5243 Arm_address output_address = section_start + section_size;
5245 // Write out the entry. The first word either points to the beginning
5246 // or after the end of a text section. The second word is the special
5247 // EXIDX_CANTUNWIND value.
5248 uint32_t prel31_offset = output_address - this->address();
5249 if (Bits<31>::has_overflow32(offset))
5250 gold_error(_("PREL31 overflow in EXIDX_CANTUNWIND entry"));
5251 elfcpp::Swap_unaligned<32, big_endian>::writeval(oview,
5252 prel31_offset & 0x7fffffffU);
5253 elfcpp::Swap_unaligned<32, big_endian>::writeval(oview + 4,
5254 elfcpp::EXIDX_CANTUNWIND);
5256 of->write_output_view(this->offset(), oview_size, oview);
5259 // Arm_exidx_merged_section methods.
5261 // Constructor for Arm_exidx_merged_section.
5262 // EXIDX_INPUT_SECTION points to the unmodified EXIDX input section.
5263 // SECTION_OFFSET_MAP points to a section offset map describing how
5264 // parts of the input section are mapped to output. DELETED_BYTES is
5265 // the number of bytes deleted from the EXIDX input section.
5267 Arm_exidx_merged_section::Arm_exidx_merged_section(
5268 const Arm_exidx_input_section& exidx_input_section,
5269 const Arm_exidx_section_offset_map& section_offset_map,
5270 uint32_t deleted_bytes)
5271 : Output_relaxed_input_section(exidx_input_section.relobj(),
5272 exidx_input_section.shndx(),
5273 exidx_input_section.addralign()),
5274 exidx_input_section_(exidx_input_section),
5275 section_offset_map_(section_offset_map)
5277 // If we retain or discard the whole EXIDX input section, we would
5279 gold_assert(deleted_bytes != 0
5280 && deleted_bytes != this->exidx_input_section_.size());
5282 // Fix size here so that we do not need to implement set_final_data_size.
5283 uint32_t size = exidx_input_section.size() - deleted_bytes;
5284 this->set_data_size(size);
5285 this->fix_data_size();
5287 // Allocate buffer for section contents and build contents.
5288 this->section_contents_ = new unsigned char[size];
5291 // Build the contents of a merged EXIDX output section.
5294 Arm_exidx_merged_section::build_contents(
5295 const unsigned char* original_contents,
5296 section_size_type original_size)
5298 // Go over spans of input offsets and write only those that are not
5300 section_offset_type in_start = 0;
5301 section_offset_type out_start = 0;
5302 section_offset_type in_max =
5303 convert_types<section_offset_type>(original_size);
5304 section_offset_type out_max =
5305 convert_types<section_offset_type>(this->data_size());
5306 for (Arm_exidx_section_offset_map::const_iterator p =
5307 this->section_offset_map_.begin();
5308 p != this->section_offset_map_.end();
5311 section_offset_type in_end = p->first;
5312 gold_assert(in_end >= in_start);
5313 section_offset_type out_end = p->second;
5314 size_t in_chunk_size = convert_types<size_t>(in_end - in_start + 1);
5317 size_t out_chunk_size =
5318 convert_types<size_t>(out_end - out_start + 1);
5320 gold_assert(out_chunk_size == in_chunk_size
5321 && in_end < in_max && out_end < out_max);
5323 memcpy(this->section_contents_ + out_start,
5324 original_contents + in_start,
5326 out_start += out_chunk_size;
5328 in_start += in_chunk_size;
5332 // Given an input OBJECT, an input section index SHNDX within that
5333 // object, and an OFFSET relative to the start of that input
5334 // section, return whether or not the corresponding offset within
5335 // the output section is known. If this function returns true, it
5336 // sets *POUTPUT to the output offset. The value -1 indicates that
5337 // this input offset is being discarded.
5340 Arm_exidx_merged_section::do_output_offset(
5341 const Relobj* relobj,
5343 section_offset_type offset,
5344 section_offset_type* poutput) const
5346 // We only handle offsets for the original EXIDX input section.
5347 if (relobj != this->exidx_input_section_.relobj()
5348 || shndx != this->exidx_input_section_.shndx())
5351 section_offset_type section_size =
5352 convert_types<section_offset_type>(this->exidx_input_section_.size());
5353 if (offset < 0 || offset >= section_size)
5354 // Input offset is out of valid range.
5358 // We need to look up the section offset map to determine the output
5359 // offset. Find the reference point in map that is first offset
5360 // bigger than or equal to this offset.
5361 Arm_exidx_section_offset_map::const_iterator p =
5362 this->section_offset_map_.lower_bound(offset);
5364 // The section offset maps are build such that this should not happen if
5365 // input offset is in the valid range.
5366 gold_assert(p != this->section_offset_map_.end());
5368 // We need to check if this is dropped.
5369 section_offset_type ref = p->first;
5370 section_offset_type mapped_ref = p->second;
5372 if (mapped_ref != Arm_exidx_input_section::invalid_offset)
5373 // Offset is present in output.
5374 *poutput = mapped_ref + (offset - ref);
5376 // Offset is discarded owing to EXIDX entry merging.
5383 // Write this to output file OF.
5386 Arm_exidx_merged_section::do_write(Output_file* of)
5388 off_t offset = this->offset();
5389 const section_size_type oview_size = this->data_size();
5390 unsigned char* const oview = of->get_output_view(offset, oview_size);
5392 Output_section* os = this->relobj()->output_section(this->shndx());
5393 gold_assert(os != NULL);
5395 memcpy(oview, this->section_contents_, oview_size);
5396 of->write_output_view(this->offset(), oview_size, oview);
5399 // Arm_exidx_fixup methods.
5401 // Append an EXIDX_CANTUNWIND in the current output section if the last entry
5402 // is not an EXIDX_CANTUNWIND entry already. The new EXIDX_CANTUNWIND entry
5403 // points to the end of the last seen EXIDX section.
5406 Arm_exidx_fixup::add_exidx_cantunwind_as_needed()
5408 if (this->last_unwind_type_ != UT_EXIDX_CANTUNWIND
5409 && this->last_input_section_ != NULL)
5411 Relobj* relobj = this->last_input_section_->relobj();
5412 unsigned int text_shndx = this->last_input_section_->link();
5413 Arm_exidx_cantunwind* cantunwind =
5414 new Arm_exidx_cantunwind(relobj, text_shndx);
5415 this->exidx_output_section_->add_output_section_data(cantunwind);
5416 this->last_unwind_type_ = UT_EXIDX_CANTUNWIND;
5420 // Process an EXIDX section entry in input. Return whether this entry
5421 // can be deleted in the output. SECOND_WORD in the second word of the
5425 Arm_exidx_fixup::process_exidx_entry(uint32_t second_word)
5428 if (second_word == elfcpp::EXIDX_CANTUNWIND)
5430 // Merge if previous entry is also an EXIDX_CANTUNWIND.
5431 delete_entry = this->last_unwind_type_ == UT_EXIDX_CANTUNWIND;
5432 this->last_unwind_type_ = UT_EXIDX_CANTUNWIND;
5434 else if ((second_word & 0x80000000) != 0)
5436 // Inlined unwinding data. Merge if equal to previous.
5437 delete_entry = (merge_exidx_entries_
5438 && this->last_unwind_type_ == UT_INLINED_ENTRY
5439 && this->last_inlined_entry_ == second_word);
5440 this->last_unwind_type_ = UT_INLINED_ENTRY;
5441 this->last_inlined_entry_ = second_word;
5445 // Normal table entry. In theory we could merge these too,
5446 // but duplicate entries are likely to be much less common.
5447 delete_entry = false;
5448 this->last_unwind_type_ = UT_NORMAL_ENTRY;
5450 return delete_entry;
5453 // Update the current section offset map during EXIDX section fix-up.
5454 // If there is no map, create one. INPUT_OFFSET is the offset of a
5455 // reference point, DELETED_BYTES is the number of deleted by in the
5456 // section so far. If DELETE_ENTRY is true, the reference point and
5457 // all offsets after the previous reference point are discarded.
5460 Arm_exidx_fixup::update_offset_map(
5461 section_offset_type input_offset,
5462 section_size_type deleted_bytes,
5465 if (this->section_offset_map_ == NULL)
5466 this->section_offset_map_ = new Arm_exidx_section_offset_map();
5467 section_offset_type output_offset;
5469 output_offset = Arm_exidx_input_section::invalid_offset;
5471 output_offset = input_offset - deleted_bytes;
5472 (*this->section_offset_map_)[input_offset] = output_offset;
5475 // Process EXIDX_INPUT_SECTION for EXIDX entry merging. Return the number of
5476 // bytes deleted. SECTION_CONTENTS points to the contents of the EXIDX
5477 // section and SECTION_SIZE is the number of bytes pointed by SECTION_CONTENTS.
5478 // If some entries are merged, also store a pointer to a newly created
5479 // Arm_exidx_section_offset_map object in *PSECTION_OFFSET_MAP. The caller
5480 // owns the map and is responsible for releasing it after use.
5482 template<bool big_endian>
5484 Arm_exidx_fixup::process_exidx_section(
5485 const Arm_exidx_input_section* exidx_input_section,
5486 const unsigned char* section_contents,
5487 section_size_type section_size,
5488 Arm_exidx_section_offset_map** psection_offset_map)
5490 Relobj* relobj = exidx_input_section->relobj();
5491 unsigned shndx = exidx_input_section->shndx();
5493 if ((section_size % 8) != 0)
5495 // Something is wrong with this section. Better not touch it.
5496 gold_error(_("uneven .ARM.exidx section size in %s section %u"),
5497 relobj->name().c_str(), shndx);
5498 this->last_input_section_ = exidx_input_section;
5499 this->last_unwind_type_ = UT_NONE;
5503 uint32_t deleted_bytes = 0;
5504 bool prev_delete_entry = false;
5505 gold_assert(this->section_offset_map_ == NULL);
5507 for (section_size_type i = 0; i < section_size; i += 8)
5509 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
5511 reinterpret_cast<const Valtype*>(section_contents + i + 4);
5512 uint32_t second_word = elfcpp::Swap<32, big_endian>::readval(wv);
5514 bool delete_entry = this->process_exidx_entry(second_word);
5516 // Entry deletion causes changes in output offsets. We use a std::map
5517 // to record these. And entry (x, y) means input offset x
5518 // is mapped to output offset y. If y is invalid_offset, then x is
5519 // dropped in the output. Because of the way std::map::lower_bound
5520 // works, we record the last offset in a region w.r.t to keeping or
5521 // dropping. If there is no entry (x0, y0) for an input offset x0,
5522 // the output offset y0 of it is determined by the output offset y1 of
5523 // the smallest input offset x1 > x0 that there is an (x1, y1) entry
5524 // in the map. If y1 is not -1, then y0 = y1 + x0 - x1. Otherwise, y1
5526 if (delete_entry != prev_delete_entry && i != 0)
5527 this->update_offset_map(i - 1, deleted_bytes, prev_delete_entry);
5529 // Update total deleted bytes for this entry.
5533 prev_delete_entry = delete_entry;
5536 // If section offset map is not NULL, make an entry for the end of
5538 if (this->section_offset_map_ != NULL)
5539 update_offset_map(section_size - 1, deleted_bytes, prev_delete_entry);
5541 *psection_offset_map = this->section_offset_map_;
5542 this->section_offset_map_ = NULL;
5543 this->last_input_section_ = exidx_input_section;
5545 // Set the first output text section so that we can link the EXIDX output
5546 // section to it. Ignore any EXIDX input section that is completely merged.
5547 if (this->first_output_text_section_ == NULL
5548 && deleted_bytes != section_size)
5550 unsigned int link = exidx_input_section->link();
5551 Output_section* os = relobj->output_section(link);
5552 gold_assert(os != NULL);
5553 this->first_output_text_section_ = os;
5556 return deleted_bytes;
5559 // Arm_output_section methods.
5561 // Create a stub group for input sections from BEGIN to END. OWNER
5562 // points to the input section to be the owner a new stub table.
5564 template<bool big_endian>
5566 Arm_output_section<big_endian>::create_stub_group(
5567 Input_section_list::const_iterator begin,
5568 Input_section_list::const_iterator end,
5569 Input_section_list::const_iterator owner,
5570 Target_arm<big_endian>* target,
5571 std::vector<Output_relaxed_input_section*>* new_relaxed_sections,
5574 // We use a different kind of relaxed section in an EXIDX section.
5575 // The static casting from Output_relaxed_input_section to
5576 // Arm_input_section is invalid in an EXIDX section. We are okay
5577 // because we should not be calling this for an EXIDX section.
5578 gold_assert(this->type() != elfcpp::SHT_ARM_EXIDX);
5580 // Currently we convert ordinary input sections into relaxed sections only
5581 // at this point but we may want to support creating relaxed input section
5582 // very early. So we check here to see if owner is already a relaxed
5585 Arm_input_section<big_endian>* arm_input_section;
5586 if (owner->is_relaxed_input_section())
5589 Arm_input_section<big_endian>::as_arm_input_section(
5590 owner->relaxed_input_section());
5594 gold_assert(owner->is_input_section());
5595 // Create a new relaxed input section. We need to lock the original
5597 Task_lock_obj<Object> tl(task, owner->relobj());
5599 target->new_arm_input_section(owner->relobj(), owner->shndx());
5600 new_relaxed_sections->push_back(arm_input_section);
5603 // Create a stub table.
5604 Stub_table<big_endian>* stub_table =
5605 target->new_stub_table(arm_input_section);
5607 arm_input_section->set_stub_table(stub_table);
5609 Input_section_list::const_iterator p = begin;
5610 Input_section_list::const_iterator prev_p;
5612 // Look for input sections or relaxed input sections in [begin ... end].
5615 if (p->is_input_section() || p->is_relaxed_input_section())
5617 // The stub table information for input sections live
5618 // in their objects.
5619 Arm_relobj<big_endian>* arm_relobj =
5620 Arm_relobj<big_endian>::as_arm_relobj(p->relobj());
5621 arm_relobj->set_stub_table(p->shndx(), stub_table);
5625 while (prev_p != end);
5628 // Group input sections for stub generation. GROUP_SIZE is roughly the limit
5629 // of stub groups. We grow a stub group by adding input section until the
5630 // size is just below GROUP_SIZE. The last input section will be converted
5631 // into a stub table. If STUB_ALWAYS_AFTER_BRANCH is false, we also add
5632 // input section after the stub table, effectively double the group size.
5634 // This is similar to the group_sections() function in elf32-arm.c but is
5635 // implemented differently.
5637 template<bool big_endian>
5639 Arm_output_section<big_endian>::group_sections(
5640 section_size_type group_size,
5641 bool stubs_always_after_branch,
5642 Target_arm<big_endian>* target,
5645 // We only care about sections containing code.
5646 if ((this->flags() & elfcpp::SHF_EXECINSTR) == 0)
5649 // States for grouping.
5652 // No group is being built.
5654 // A group is being built but the stub table is not found yet.
5655 // We keep group a stub group until the size is just under GROUP_SIZE.
5656 // The last input section in the group will be used as the stub table.
5657 FINDING_STUB_SECTION,
5658 // A group is being built and we have already found a stub table.
5659 // We enter this state to grow a stub group by adding input section
5660 // after the stub table. This effectively doubles the group size.
5664 // Any newly created relaxed sections are stored here.
5665 std::vector<Output_relaxed_input_section*> new_relaxed_sections;
5667 State state = NO_GROUP;
5668 section_size_type off = 0;
5669 section_size_type group_begin_offset = 0;
5670 section_size_type group_end_offset = 0;
5671 section_size_type stub_table_end_offset = 0;
5672 Input_section_list::const_iterator group_begin =
5673 this->input_sections().end();
5674 Input_section_list::const_iterator stub_table =
5675 this->input_sections().end();
5676 Input_section_list::const_iterator group_end = this->input_sections().end();
5677 for (Input_section_list::const_iterator p = this->input_sections().begin();
5678 p != this->input_sections().end();
5681 section_size_type section_begin_offset =
5682 align_address(off, p->addralign());
5683 section_size_type section_end_offset =
5684 section_begin_offset + p->data_size();
5686 // Check to see if we should group the previously seen sections.
5692 case FINDING_STUB_SECTION:
5693 // Adding this section makes the group larger than GROUP_SIZE.
5694 if (section_end_offset - group_begin_offset >= group_size)
5696 if (stubs_always_after_branch)
5698 gold_assert(group_end != this->input_sections().end());
5699 this->create_stub_group(group_begin, group_end, group_end,
5700 target, &new_relaxed_sections,
5706 // But wait, there's more! Input sections up to
5707 // stub_group_size bytes after the stub table can be
5708 // handled by it too.
5709 state = HAS_STUB_SECTION;
5710 stub_table = group_end;
5711 stub_table_end_offset = group_end_offset;
5716 case HAS_STUB_SECTION:
5717 // Adding this section makes the post stub-section group larger
5719 if (section_end_offset - stub_table_end_offset >= group_size)
5721 gold_assert(group_end != this->input_sections().end());
5722 this->create_stub_group(group_begin, group_end, stub_table,
5723 target, &new_relaxed_sections, task);
5732 // If we see an input section and currently there is no group, start
5733 // a new one. Skip any empty sections. We look at the data size
5734 // instead of calling p->relobj()->section_size() to avoid locking.
5735 if ((p->is_input_section() || p->is_relaxed_input_section())
5736 && (p->data_size() != 0))
5738 if (state == NO_GROUP)
5740 state = FINDING_STUB_SECTION;
5742 group_begin_offset = section_begin_offset;
5745 // Keep track of the last input section seen.
5747 group_end_offset = section_end_offset;
5750 off = section_end_offset;
5753 // Create a stub group for any ungrouped sections.
5754 if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION)
5756 gold_assert(group_end != this->input_sections().end());
5757 this->create_stub_group(group_begin, group_end,
5758 (state == FINDING_STUB_SECTION
5761 target, &new_relaxed_sections, task);
5764 // Convert input section into relaxed input section in a batch.
5765 if (!new_relaxed_sections.empty())
5766 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections);
5768 // Update the section offsets
5769 for (size_t i = 0; i < new_relaxed_sections.size(); ++i)
5771 Arm_relobj<big_endian>* arm_relobj =
5772 Arm_relobj<big_endian>::as_arm_relobj(
5773 new_relaxed_sections[i]->relobj());
5774 unsigned int shndx = new_relaxed_sections[i]->shndx();
5775 // Tell Arm_relobj that this input section is converted.
5776 arm_relobj->convert_input_section_to_relaxed_section(shndx);
5780 // Append non empty text sections in this to LIST in ascending
5781 // order of their position in this.
5783 template<bool big_endian>
5785 Arm_output_section<big_endian>::append_text_sections_to_list(
5786 Text_section_list* list)
5788 gold_assert((this->flags() & elfcpp::SHF_ALLOC) != 0);
5790 for (Input_section_list::const_iterator p = this->input_sections().begin();
5791 p != this->input_sections().end();
5794 // We only care about plain or relaxed input sections. We also
5795 // ignore any merged sections.
5796 if (p->is_input_section() || p->is_relaxed_input_section())
5797 list->push_back(Text_section_list::value_type(p->relobj(),
5802 template<bool big_endian>
5804 Arm_output_section<big_endian>::fix_exidx_coverage(
5806 const Text_section_list& sorted_text_sections,
5807 Symbol_table* symtab,
5808 bool merge_exidx_entries,
5811 // We should only do this for the EXIDX output section.
5812 gold_assert(this->type() == elfcpp::SHT_ARM_EXIDX);
5814 // We don't want the relaxation loop to undo these changes, so we discard
5815 // the current saved states and take another one after the fix-up.
5816 this->discard_states();
5818 // Remove all input sections.
5819 uint64_t address = this->address();
5820 typedef std::list<Output_section::Input_section> Input_section_list;
5821 Input_section_list input_sections;
5822 this->reset_address_and_file_offset();
5823 this->get_input_sections(address, std::string(""), &input_sections);
5825 if (!this->input_sections().empty())
5826 gold_error(_("Found non-EXIDX input sections in EXIDX output section"));
5828 // Go through all the known input sections and record them.
5829 typedef Unordered_set<Section_id, Section_id_hash> Section_id_set;
5830 typedef Unordered_map<Section_id, const Output_section::Input_section*,
5831 Section_id_hash> Text_to_exidx_map;
5832 Text_to_exidx_map text_to_exidx_map;
5833 for (Input_section_list::const_iterator p = input_sections.begin();
5834 p != input_sections.end();
5837 // This should never happen. At this point, we should only see
5838 // plain EXIDX input sections.
5839 gold_assert(!p->is_relaxed_input_section());
5840 text_to_exidx_map[Section_id(p->relobj(), p->shndx())] = &(*p);
5843 Arm_exidx_fixup exidx_fixup(this, merge_exidx_entries);
5845 // Go over the sorted text sections.
5846 typedef Unordered_set<Section_id, Section_id_hash> Section_id_set;
5847 Section_id_set processed_input_sections;
5848 for (Text_section_list::const_iterator p = sorted_text_sections.begin();
5849 p != sorted_text_sections.end();
5852 Relobj* relobj = p->first;
5853 unsigned int shndx = p->second;
5855 Arm_relobj<big_endian>* arm_relobj =
5856 Arm_relobj<big_endian>::as_arm_relobj(relobj);
5857 const Arm_exidx_input_section* exidx_input_section =
5858 arm_relobj->exidx_input_section_by_link(shndx);
5860 // If this text section has no EXIDX section or if the EXIDX section
5861 // has errors, force an EXIDX_CANTUNWIND entry pointing to the end
5862 // of the last seen EXIDX section.
5863 if (exidx_input_section == NULL || exidx_input_section->has_errors())
5865 exidx_fixup.add_exidx_cantunwind_as_needed();
5869 Relobj* exidx_relobj = exidx_input_section->relobj();
5870 unsigned int exidx_shndx = exidx_input_section->shndx();
5871 Section_id sid(exidx_relobj, exidx_shndx);
5872 Text_to_exidx_map::const_iterator iter = text_to_exidx_map.find(sid);
5873 if (iter == text_to_exidx_map.end())
5875 // This is odd. We have not seen this EXIDX input section before.
5876 // We cannot do fix-up. If we saw a SECTIONS clause in a script,
5877 // issue a warning instead. We assume the user knows what he
5878 // or she is doing. Otherwise, this is an error.
5879 if (layout->script_options()->saw_sections_clause())
5880 gold_warning(_("unwinding may not work because EXIDX input section"
5881 " %u of %s is not in EXIDX output section"),
5882 exidx_shndx, exidx_relobj->name().c_str());
5884 gold_error(_("unwinding may not work because EXIDX input section"
5885 " %u of %s is not in EXIDX output section"),
5886 exidx_shndx, exidx_relobj->name().c_str());
5888 exidx_fixup.add_exidx_cantunwind_as_needed();
5892 // We need to access the contents of the EXIDX section, lock the
5894 Task_lock_obj<Object> tl(task, exidx_relobj);
5895 section_size_type exidx_size;
5896 const unsigned char* exidx_contents =
5897 exidx_relobj->section_contents(exidx_shndx, &exidx_size, false);
5899 // Fix up coverage and append input section to output data list.
5900 Arm_exidx_section_offset_map* section_offset_map = NULL;
5901 uint32_t deleted_bytes =
5902 exidx_fixup.process_exidx_section<big_endian>(exidx_input_section,
5905 §ion_offset_map);
5907 if (deleted_bytes == exidx_input_section->size())
5909 // The whole EXIDX section got merged. Remove it from output.
5910 gold_assert(section_offset_map == NULL);
5911 exidx_relobj->set_output_section(exidx_shndx, NULL);
5913 // All local symbols defined in this input section will be dropped.
5914 // We need to adjust output local symbol count.
5915 arm_relobj->set_output_local_symbol_count_needs_update();
5917 else if (deleted_bytes > 0)
5919 // Some entries are merged. We need to convert this EXIDX input
5920 // section into a relaxed section.
5921 gold_assert(section_offset_map != NULL);
5923 Arm_exidx_merged_section* merged_section =
5924 new Arm_exidx_merged_section(*exidx_input_section,
5925 *section_offset_map, deleted_bytes);
5926 merged_section->build_contents(exidx_contents, exidx_size);
5928 const std::string secname = exidx_relobj->section_name(exidx_shndx);
5929 this->add_relaxed_input_section(layout, merged_section, secname);
5930 arm_relobj->convert_input_section_to_relaxed_section(exidx_shndx);
5932 // All local symbols defined in discarded portions of this input
5933 // section will be dropped. We need to adjust output local symbol
5935 arm_relobj->set_output_local_symbol_count_needs_update();
5939 // Just add back the EXIDX input section.
5940 gold_assert(section_offset_map == NULL);
5941 const Output_section::Input_section* pis = iter->second;
5942 gold_assert(pis->is_input_section());
5943 this->add_script_input_section(*pis);
5946 processed_input_sections.insert(Section_id(exidx_relobj, exidx_shndx));
5949 // Insert an EXIDX_CANTUNWIND entry at the end of output if necessary.
5950 exidx_fixup.add_exidx_cantunwind_as_needed();
5952 // Remove any known EXIDX input sections that are not processed.
5953 for (Input_section_list::const_iterator p = input_sections.begin();
5954 p != input_sections.end();
5957 if (processed_input_sections.find(Section_id(p->relobj(), p->shndx()))
5958 == processed_input_sections.end())
5960 // We discard a known EXIDX section because its linked
5961 // text section has been folded by ICF. We also discard an
5962 // EXIDX section with error, the output does not matter in this
5963 // case. We do this to avoid triggering asserts.
5964 Arm_relobj<big_endian>* arm_relobj =
5965 Arm_relobj<big_endian>::as_arm_relobj(p->relobj());
5966 const Arm_exidx_input_section* exidx_input_section =
5967 arm_relobj->exidx_input_section_by_shndx(p->shndx());
5968 gold_assert(exidx_input_section != NULL);
5969 if (!exidx_input_section->has_errors())
5971 unsigned int text_shndx = exidx_input_section->link();
5972 gold_assert(symtab->is_section_folded(p->relobj(), text_shndx));
5975 // Remove this from link. We also need to recount the
5977 p->relobj()->set_output_section(p->shndx(), NULL);
5978 arm_relobj->set_output_local_symbol_count_needs_update();
5982 // Link exidx output section to the first seen output section and
5983 // set correct entry size.
5984 this->set_link_section(exidx_fixup.first_output_text_section());
5985 this->set_entsize(8);
5987 // Make changes permanent.
5988 this->save_states();
5989 this->set_section_offsets_need_adjustment();
5992 // Link EXIDX output sections to text output sections.
5994 template<bool big_endian>
5996 Arm_output_section<big_endian>::set_exidx_section_link()
5998 gold_assert(this->type() == elfcpp::SHT_ARM_EXIDX);
5999 if (!this->input_sections().empty())
6001 Input_section_list::const_iterator p = this->input_sections().begin();
6002 Arm_relobj<big_endian>* arm_relobj =
6003 Arm_relobj<big_endian>::as_arm_relobj(p->relobj());
6004 unsigned exidx_shndx = p->shndx();
6005 const Arm_exidx_input_section* exidx_input_section =
6006 arm_relobj->exidx_input_section_by_shndx(exidx_shndx);
6007 gold_assert(exidx_input_section != NULL);
6008 unsigned int text_shndx = exidx_input_section->link();
6009 Output_section* os = arm_relobj->output_section(text_shndx);
6010 this->set_link_section(os);
6014 // Arm_relobj methods.
6016 // Determine if an input section is scannable for stub processing. SHDR is
6017 // the header of the section and SHNDX is the section index. OS is the output
6018 // section for the input section and SYMTAB is the global symbol table used to
6019 // look up ICF information.
6021 template<bool big_endian>
6023 Arm_relobj<big_endian>::section_is_scannable(
6024 const elfcpp::Shdr<32, big_endian>& shdr,
6026 const Output_section* os,
6027 const Symbol_table* symtab)
6029 // Skip any empty sections, unallocated sections or sections whose
6030 // type are not SHT_PROGBITS.
6031 if (shdr.get_sh_size() == 0
6032 || (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0
6033 || shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
6036 // Skip any discarded or ICF'ed sections.
6037 if (os == NULL || symtab->is_section_folded(this, shndx))
6040 // If this requires special offset handling, check to see if it is
6041 // a relaxed section. If this is not, then it is a merged section that
6042 // we cannot handle.
6043 if (this->is_output_section_offset_invalid(shndx))
6045 const Output_relaxed_input_section* poris =
6046 os->find_relaxed_input_section(this, shndx);
6054 // Determine if we want to scan the SHNDX-th section for relocation stubs.
6055 // This is a helper for Arm_relobj::scan_sections_for_stubs() below.
6057 template<bool big_endian>
6059 Arm_relobj<big_endian>::section_needs_reloc_stub_scanning(
6060 const elfcpp::Shdr<32, big_endian>& shdr,
6061 const Relobj::Output_sections& out_sections,
6062 const Symbol_table* symtab,
6063 const unsigned char* pshdrs)
6065 unsigned int sh_type = shdr.get_sh_type();
6066 if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
6069 // Ignore empty section.
6070 off_t sh_size = shdr.get_sh_size();
6074 // Ignore reloc section with unexpected symbol table. The
6075 // error will be reported in the final link.
6076 if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx())
6079 unsigned int reloc_size;
6080 if (sh_type == elfcpp::SHT_REL)
6081 reloc_size = elfcpp::Elf_sizes<32>::rel_size;
6083 reloc_size = elfcpp::Elf_sizes<32>::rela_size;
6085 // Ignore reloc section with unexpected entsize or uneven size.
6086 // The error will be reported in the final link.
6087 if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0)
6090 // Ignore reloc section with bad info. This error will be
6091 // reported in the final link.
6092 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
6093 if (index >= this->shnum())
6096 const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6097 const elfcpp::Shdr<32, big_endian> text_shdr(pshdrs + index * shdr_size);
6098 return this->section_is_scannable(text_shdr, index,
6099 out_sections[index], symtab);
6102 // Return the output address of either a plain input section or a relaxed
6103 // input section. SHNDX is the section index. We define and use this
6104 // instead of calling Output_section::output_address because that is slow
6105 // for large output.
6107 template<bool big_endian>
6109 Arm_relobj<big_endian>::simple_input_section_output_address(
6113 if (this->is_output_section_offset_invalid(shndx))
6115 const Output_relaxed_input_section* poris =
6116 os->find_relaxed_input_section(this, shndx);
6117 // We do not handle merged sections here.
6118 gold_assert(poris != NULL);
6119 return poris->address();
6122 return os->address() + this->get_output_section_offset(shndx);
6125 // Determine if we want to scan the SHNDX-th section for non-relocation stubs.
6126 // This is a helper for Arm_relobj::scan_sections_for_stubs() below.
6128 template<bool big_endian>
6130 Arm_relobj<big_endian>::section_needs_cortex_a8_stub_scanning(
6131 const elfcpp::Shdr<32, big_endian>& shdr,
6134 const Symbol_table* symtab)
6136 if (!this->section_is_scannable(shdr, shndx, os, symtab))
6139 // If the section does not cross any 4K-boundaries, it does not need to
6141 Arm_address address = this->simple_input_section_output_address(shndx, os);
6142 if ((address & ~0xfffU) == ((address + shdr.get_sh_size() - 1) & ~0xfffU))
6148 // Scan a section for Cortex-A8 workaround.
6150 template<bool big_endian>
6152 Arm_relobj<big_endian>::scan_section_for_cortex_a8_erratum(
6153 const elfcpp::Shdr<32, big_endian>& shdr,
6156 Target_arm<big_endian>* arm_target)
6158 // Look for the first mapping symbol in this section. It should be
6160 Mapping_symbol_position section_start(shndx, 0);
6161 typename Mapping_symbols_info::const_iterator p =
6162 this->mapping_symbols_info_.lower_bound(section_start);
6164 // There are no mapping symbols for this section. Treat it as a data-only
6165 // section. Issue a warning if section is marked as containing
6167 if (p == this->mapping_symbols_info_.end() || p->first.first != shndx)
6169 if ((this->section_flags(shndx) & elfcpp::SHF_EXECINSTR) != 0)
6170 gold_warning(_("cannot scan executable section %u of %s for Cortex-A8 "
6171 "erratum because it has no mapping symbols."),
6172 shndx, this->name().c_str());
6176 Arm_address output_address =
6177 this->simple_input_section_output_address(shndx, os);
6179 // Get the section contents.
6180 section_size_type input_view_size = 0;
6181 const unsigned char* input_view =
6182 this->section_contents(shndx, &input_view_size, false);
6184 // We need to go through the mapping symbols to determine what to
6185 // scan. There are two reasons. First, we should look at THUMB code and
6186 // THUMB code only. Second, we only want to look at the 4K-page boundary
6187 // to speed up the scanning.
6189 while (p != this->mapping_symbols_info_.end()
6190 && p->first.first == shndx)
6192 typename Mapping_symbols_info::const_iterator next =
6193 this->mapping_symbols_info_.upper_bound(p->first);
6195 // Only scan part of a section with THUMB code.
6196 if (p->second == 't')
6198 // Determine the end of this range.
6199 section_size_type span_start =
6200 convert_to_section_size_type(p->first.second);
6201 section_size_type span_end;
6202 if (next != this->mapping_symbols_info_.end()
6203 && next->first.first == shndx)
6204 span_end = convert_to_section_size_type(next->first.second);
6206 span_end = convert_to_section_size_type(shdr.get_sh_size());
6208 if (((span_start + output_address) & ~0xfffUL)
6209 != ((span_end + output_address - 1) & ~0xfffUL))
6211 arm_target->scan_span_for_cortex_a8_erratum(this, shndx,
6212 span_start, span_end,
6222 // Scan relocations for stub generation.
6224 template<bool big_endian>
6226 Arm_relobj<big_endian>::scan_sections_for_stubs(
6227 Target_arm<big_endian>* arm_target,
6228 const Symbol_table* symtab,
6229 const Layout* layout)
6231 unsigned int shnum = this->shnum();
6232 const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6234 // Read the section headers.
6235 const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
6239 // To speed up processing, we set up hash tables for fast lookup of
6240 // input offsets to output addresses.
6241 this->initialize_input_to_output_maps();
6243 const Relobj::Output_sections& out_sections(this->output_sections());
6245 Relocate_info<32, big_endian> relinfo;
6246 relinfo.symtab = symtab;
6247 relinfo.layout = layout;
6248 relinfo.object = this;
6250 // Do relocation stubs scanning.
6251 const unsigned char* p = pshdrs + shdr_size;
6252 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
6254 const elfcpp::Shdr<32, big_endian> shdr(p);
6255 if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab,
6258 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
6259 Arm_address output_offset = this->get_output_section_offset(index);
6260 Arm_address output_address;
6261 if (output_offset != invalid_address)
6262 output_address = out_sections[index]->address() + output_offset;
6265 // Currently this only happens for a relaxed section.
6266 const Output_relaxed_input_section* poris =
6267 out_sections[index]->find_relaxed_input_section(this, index);
6268 gold_assert(poris != NULL);
6269 output_address = poris->address();
6272 // Get the relocations.
6273 const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
6277 // Get the section contents. This does work for the case in which
6278 // we modify the contents of an input section. We need to pass the
6279 // output view under such circumstances.
6280 section_size_type input_view_size = 0;
6281 const unsigned char* input_view =
6282 this->section_contents(index, &input_view_size, false);
6284 relinfo.reloc_shndx = i;
6285 relinfo.data_shndx = index;
6286 unsigned int sh_type = shdr.get_sh_type();
6287 unsigned int reloc_size;
6288 if (sh_type == elfcpp::SHT_REL)
6289 reloc_size = elfcpp::Elf_sizes<32>::rel_size;
6291 reloc_size = elfcpp::Elf_sizes<32>::rela_size;
6293 Output_section* os = out_sections[index];
6294 arm_target->scan_section_for_stubs(&relinfo, sh_type, prelocs,
6295 shdr.get_sh_size() / reloc_size,
6297 output_offset == invalid_address,
6298 input_view, output_address,
6303 // Do Cortex-A8 erratum stubs scanning. This has to be done for a section
6304 // after its relocation section, if there is one, is processed for
6305 // relocation stubs. Merging this loop with the one above would have been
6306 // complicated since we would have had to make sure that relocation stub
6307 // scanning is done first.
6308 if (arm_target->fix_cortex_a8())
6310 const unsigned char* p = pshdrs + shdr_size;
6311 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
6313 const elfcpp::Shdr<32, big_endian> shdr(p);
6314 if (this->section_needs_cortex_a8_stub_scanning(shdr, i,
6317 this->scan_section_for_cortex_a8_erratum(shdr, i, out_sections[i],
6322 // After we've done the relocations, we release the hash tables,
6323 // since we no longer need them.
6324 this->free_input_to_output_maps();
6327 // Count the local symbols. The ARM backend needs to know if a symbol
6328 // is a THUMB function or not. For global symbols, it is easy because
6329 // the Symbol object keeps the ELF symbol type. For local symbol it is
6330 // harder because we cannot access this information. So we override the
6331 // do_count_local_symbol in parent and scan local symbols to mark
6332 // THUMB functions. This is not the most efficient way but I do not want to
6333 // slow down other ports by calling a per symbol target hook inside
6334 // Sized_relobj_file<size, big_endian>::do_count_local_symbols.
6336 template<bool big_endian>
6338 Arm_relobj<big_endian>::do_count_local_symbols(
6339 Stringpool_template<char>* pool,
6340 Stringpool_template<char>* dynpool)
6342 // We need to fix-up the values of any local symbols whose type are
6345 // Ask parent to count the local symbols.
6346 Sized_relobj_file<32, big_endian>::do_count_local_symbols(pool, dynpool);
6347 const unsigned int loccount = this->local_symbol_count();
6351 // Initialize the thumb function bit-vector.
6352 std::vector<bool> empty_vector(loccount, false);
6353 this->local_symbol_is_thumb_function_.swap(empty_vector);
6355 // Read the symbol table section header.
6356 const unsigned int symtab_shndx = this->symtab_shndx();
6357 elfcpp::Shdr<32, big_endian>
6358 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
6359 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
6361 // Read the local symbols.
6362 const int sym_size =elfcpp::Elf_sizes<32>::sym_size;
6363 gold_assert(loccount == symtabshdr.get_sh_info());
6364 off_t locsize = loccount * sym_size;
6365 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
6366 locsize, true, true);
6368 // For mapping symbol processing, we need to read the symbol names.
6369 unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
6370 if (strtab_shndx >= this->shnum())
6372 this->error(_("invalid symbol table name index: %u"), strtab_shndx);
6376 elfcpp::Shdr<32, big_endian>
6377 strtabshdr(this, this->elf_file()->section_header(strtab_shndx));
6378 if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
6380 this->error(_("symbol table name section has wrong type: %u"),
6381 static_cast<unsigned int>(strtabshdr.get_sh_type()));
6384 const char* pnames =
6385 reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(),
6386 strtabshdr.get_sh_size(),
6389 // Loop over the local symbols and mark any local symbols pointing
6390 // to THUMB functions.
6392 // Skip the first dummy symbol.
6394 typename Sized_relobj_file<32, big_endian>::Local_values* plocal_values =
6395 this->local_values();
6396 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
6398 elfcpp::Sym<32, big_endian> sym(psyms);
6399 elfcpp::STT st_type = sym.get_st_type();
6400 Symbol_value<32>& lv((*plocal_values)[i]);
6401 Arm_address input_value = lv.input_value();
6403 // Check to see if this is a mapping symbol.
6404 const char* sym_name = pnames + sym.get_st_name();
6405 if (Target_arm<big_endian>::is_mapping_symbol_name(sym_name))
6408 unsigned int input_shndx =
6409 this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary);
6410 gold_assert(is_ordinary);
6412 // Strip of LSB in case this is a THUMB symbol.
6413 Mapping_symbol_position msp(input_shndx, input_value & ~1U);
6414 this->mapping_symbols_info_[msp] = sym_name[1];
6417 if (st_type == elfcpp::STT_ARM_TFUNC
6418 || (st_type == elfcpp::STT_FUNC && ((input_value & 1) != 0)))
6420 // This is a THUMB function. Mark this and canonicalize the
6421 // symbol value by setting LSB.
6422 this->local_symbol_is_thumb_function_[i] = true;
6423 if ((input_value & 1) == 0)
6424 lv.set_input_value(input_value | 1);
6429 // Relocate sections.
6430 template<bool big_endian>
6432 Arm_relobj<big_endian>::do_relocate_sections(
6433 const Symbol_table* symtab,
6434 const Layout* layout,
6435 const unsigned char* pshdrs,
6437 typename Sized_relobj_file<32, big_endian>::Views* pviews)
6439 // Call parent to relocate sections.
6440 Sized_relobj_file<32, big_endian>::do_relocate_sections(symtab, layout,
6441 pshdrs, of, pviews);
6443 // We do not generate stubs if doing a relocatable link.
6444 if (parameters->options().relocatable())
6447 // Relocate stub tables.
6448 unsigned int shnum = this->shnum();
6450 Target_arm<big_endian>* arm_target =
6451 Target_arm<big_endian>::default_target();
6453 Relocate_info<32, big_endian> relinfo;
6454 relinfo.symtab = symtab;
6455 relinfo.layout = layout;
6456 relinfo.object = this;
6458 for (unsigned int i = 1; i < shnum; ++i)
6460 Arm_input_section<big_endian>* arm_input_section =
6461 arm_target->find_arm_input_section(this, i);
6463 if (arm_input_section != NULL
6464 && arm_input_section->is_stub_table_owner()
6465 && !arm_input_section->stub_table()->empty())
6467 // We cannot discard a section if it owns a stub table.
6468 Output_section* os = this->output_section(i);
6469 gold_assert(os != NULL);
6471 relinfo.reloc_shndx = elfcpp::SHN_UNDEF;
6472 relinfo.reloc_shdr = NULL;
6473 relinfo.data_shndx = i;
6474 relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<32>::shdr_size;
6476 gold_assert((*pviews)[i].view != NULL);
6478 // We are passed the output section view. Adjust it to cover the
6480 Stub_table<big_endian>* stub_table = arm_input_section->stub_table();
6481 gold_assert((stub_table->address() >= (*pviews)[i].address)
6482 && ((stub_table->address() + stub_table->data_size())
6483 <= (*pviews)[i].address + (*pviews)[i].view_size));
6485 off_t offset = stub_table->address() - (*pviews)[i].address;
6486 unsigned char* view = (*pviews)[i].view + offset;
6487 Arm_address address = stub_table->address();
6488 section_size_type view_size = stub_table->data_size();
6490 stub_table->relocate_stubs(&relinfo, arm_target, os, view, address,
6494 // Apply Cortex A8 workaround if applicable.
6495 if (this->section_has_cortex_a8_workaround(i))
6497 unsigned char* view = (*pviews)[i].view;
6498 Arm_address view_address = (*pviews)[i].address;
6499 section_size_type view_size = (*pviews)[i].view_size;
6500 Stub_table<big_endian>* stub_table = this->stub_tables_[i];
6502 // Adjust view to cover section.
6503 Output_section* os = this->output_section(i);
6504 gold_assert(os != NULL);
6505 Arm_address section_address =
6506 this->simple_input_section_output_address(i, os);
6507 uint64_t section_size = this->section_size(i);
6509 gold_assert(section_address >= view_address
6510 && ((section_address + section_size)
6511 <= (view_address + view_size)));
6513 unsigned char* section_view = view + (section_address - view_address);
6515 // Apply the Cortex-A8 workaround to the output address range
6516 // corresponding to this input section.
6517 stub_table->apply_cortex_a8_workaround_to_address_range(
6526 // Find the linked text section of an EXIDX section by looking at the first
6527 // relocation. 4.4.1 of the EHABI specifications says that an EXIDX section
6528 // must be linked to its associated code section via the sh_link field of
6529 // its section header. However, some tools are broken and the link is not
6530 // always set. LD just drops such an EXIDX section silently, causing the
6531 // associated code not unwindabled. Here we try a little bit harder to
6532 // discover the linked code section.
6534 // PSHDR points to the section header of a relocation section of an EXIDX
6535 // section. If we can find a linked text section, return true and
6536 // store the text section index in the location PSHNDX. Otherwise
6539 template<bool big_endian>
6541 Arm_relobj<big_endian>::find_linked_text_section(
6542 const unsigned char* pshdr,
6543 const unsigned char* psyms,
6544 unsigned int* pshndx)
6546 elfcpp::Shdr<32, big_endian> shdr(pshdr);
6548 // If there is no relocation, we cannot find the linked text section.
6550 if (shdr.get_sh_type() == elfcpp::SHT_REL)
6551 reloc_size = elfcpp::Elf_sizes<32>::rel_size;
6553 reloc_size = elfcpp::Elf_sizes<32>::rela_size;
6554 size_t reloc_count = shdr.get_sh_size() / reloc_size;
6556 // Get the relocations.
6557 const unsigned char* prelocs =
6558 this->get_view(shdr.get_sh_offset(), shdr.get_sh_size(), true, false);
6560 // Find the REL31 relocation for the first word of the first EXIDX entry.
6561 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
6563 Arm_address r_offset;
6564 typename elfcpp::Elf_types<32>::Elf_WXword r_info;
6565 if (shdr.get_sh_type() == elfcpp::SHT_REL)
6567 typename elfcpp::Rel<32, big_endian> reloc(prelocs);
6568 r_info = reloc.get_r_info();
6569 r_offset = reloc.get_r_offset();
6573 typename elfcpp::Rela<32, big_endian> reloc(prelocs);
6574 r_info = reloc.get_r_info();
6575 r_offset = reloc.get_r_offset();
6578 unsigned int r_type = elfcpp::elf_r_type<32>(r_info);
6579 if (r_type != elfcpp::R_ARM_PREL31 && r_type != elfcpp::R_ARM_SBREL31)
6582 unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
6584 || r_sym >= this->local_symbol_count()
6588 // This is the relocation for the first word of the first EXIDX entry.
6589 // We expect to see a local section symbol.
6590 const int sym_size = elfcpp::Elf_sizes<32>::sym_size;
6591 elfcpp::Sym<32, big_endian> sym(psyms + r_sym * sym_size);
6592 if (sym.get_st_type() == elfcpp::STT_SECTION)
6596 this->adjust_sym_shndx(r_sym, sym.get_st_shndx(), &is_ordinary);
6597 gold_assert(is_ordinary);
6607 // Make an EXIDX input section object for an EXIDX section whose index is
6608 // SHNDX. SHDR is the section header of the EXIDX section and TEXT_SHNDX
6609 // is the section index of the linked text section.
6611 template<bool big_endian>
6613 Arm_relobj<big_endian>::make_exidx_input_section(
6615 const elfcpp::Shdr<32, big_endian>& shdr,
6616 unsigned int text_shndx,
6617 const elfcpp::Shdr<32, big_endian>& text_shdr)
6619 // Create an Arm_exidx_input_section object for this EXIDX section.
6620 Arm_exidx_input_section* exidx_input_section =
6621 new Arm_exidx_input_section(this, shndx, text_shndx, shdr.get_sh_size(),
6622 shdr.get_sh_addralign(),
6623 text_shdr.get_sh_size());
6625 gold_assert(this->exidx_section_map_[shndx] == NULL);
6626 this->exidx_section_map_[shndx] = exidx_input_section;
6628 if (text_shndx == elfcpp::SHN_UNDEF || text_shndx >= this->shnum())
6630 gold_error(_("EXIDX section %s(%u) links to invalid section %u in %s"),
6631 this->section_name(shndx).c_str(), shndx, text_shndx,
6632 this->name().c_str());
6633 exidx_input_section->set_has_errors();
6635 else if (this->exidx_section_map_[text_shndx] != NULL)
6637 unsigned other_exidx_shndx =
6638 this->exidx_section_map_[text_shndx]->shndx();
6639 gold_error(_("EXIDX sections %s(%u) and %s(%u) both link to text section"
6641 this->section_name(shndx).c_str(), shndx,
6642 this->section_name(other_exidx_shndx).c_str(),
6643 other_exidx_shndx, this->section_name(text_shndx).c_str(),
6644 text_shndx, this->name().c_str());
6645 exidx_input_section->set_has_errors();
6648 this->exidx_section_map_[text_shndx] = exidx_input_section;
6650 // Check section flags of text section.
6651 if ((text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
6653 gold_error(_("EXIDX section %s(%u) links to non-allocated section %s(%u) "
6655 this->section_name(shndx).c_str(), shndx,
6656 this->section_name(text_shndx).c_str(), text_shndx,
6657 this->name().c_str());
6658 exidx_input_section->set_has_errors();
6660 else if ((text_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) == 0)
6661 // I would like to make this an error but currently ld just ignores
6663 gold_warning(_("EXIDX section %s(%u) links to non-executable section "
6665 this->section_name(shndx).c_str(), shndx,
6666 this->section_name(text_shndx).c_str(), text_shndx,
6667 this->name().c_str());
6670 // Read the symbol information.
6672 template<bool big_endian>
6674 Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd)
6676 // Call parent class to read symbol information.
6677 Sized_relobj_file<32, big_endian>::do_read_symbols(sd);
6679 // If this input file is a binary file, it has no processor
6680 // specific flags and attributes section.
6681 Input_file::Format format = this->input_file()->format();
6682 if (format != Input_file::FORMAT_ELF)
6684 gold_assert(format == Input_file::FORMAT_BINARY);
6685 this->merge_flags_and_attributes_ = false;
6689 // Read processor-specific flags in ELF file header.
6690 const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset,
6691 elfcpp::Elf_sizes<32>::ehdr_size,
6693 elfcpp::Ehdr<32, big_endian> ehdr(pehdr);
6694 this->processor_specific_flags_ = ehdr.get_e_flags();
6696 // Go over the section headers and look for .ARM.attributes and .ARM.exidx
6698 std::vector<unsigned int> deferred_exidx_sections;
6699 const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6700 const unsigned char* pshdrs = sd->section_headers->data();
6701 const unsigned char* ps = pshdrs + shdr_size;
6702 bool must_merge_flags_and_attributes = false;
6703 for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size)
6705 elfcpp::Shdr<32, big_endian> shdr(ps);
6707 // Sometimes an object has no contents except the section name string
6708 // table and an empty symbol table with the undefined symbol. We
6709 // don't want to merge processor-specific flags from such an object.
6710 if (shdr.get_sh_type() == elfcpp::SHT_SYMTAB)
6712 // Symbol table is not empty.
6713 const elfcpp::Elf_types<32>::Elf_WXword sym_size =
6714 elfcpp::Elf_sizes<32>::sym_size;
6715 if (shdr.get_sh_size() > sym_size)
6716 must_merge_flags_and_attributes = true;
6718 else if (shdr.get_sh_type() != elfcpp::SHT_STRTAB)
6719 // If this is neither an empty symbol table nor a string table,
6721 must_merge_flags_and_attributes = true;
6723 if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES)
6725 gold_assert(this->attributes_section_data_ == NULL);
6726 section_offset_type section_offset = shdr.get_sh_offset();
6727 section_size_type section_size =
6728 convert_to_section_size_type(shdr.get_sh_size());
6729 const unsigned char* view =
6730 this->get_view(section_offset, section_size, true, false);
6731 this->attributes_section_data_ =
6732 new Attributes_section_data(view, section_size);
6734 else if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX)
6736 unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link());
6737 if (text_shndx == elfcpp::SHN_UNDEF)
6738 deferred_exidx_sections.push_back(i);
6741 elfcpp::Shdr<32, big_endian> text_shdr(pshdrs
6742 + text_shndx * shdr_size);
6743 this->make_exidx_input_section(i, shdr, text_shndx, text_shdr);
6745 // EHABI 4.4.1 requires that SHF_LINK_ORDER flag to be set.
6746 if ((shdr.get_sh_flags() & elfcpp::SHF_LINK_ORDER) == 0)
6747 gold_warning(_("SHF_LINK_ORDER not set in EXIDX section %s of %s"),
6748 this->section_name(i).c_str(), this->name().c_str());
6753 if (!must_merge_flags_and_attributes)
6755 gold_assert(deferred_exidx_sections.empty());
6756 this->merge_flags_and_attributes_ = false;
6760 // Some tools are broken and they do not set the link of EXIDX sections.
6761 // We look at the first relocation to figure out the linked sections.
6762 if (!deferred_exidx_sections.empty())
6764 // We need to go over the section headers again to find the mapping
6765 // from sections being relocated to their relocation sections. This is
6766 // a bit inefficient as we could do that in the loop above. However,
6767 // we do not expect any deferred EXIDX sections normally. So we do not
6768 // want to slow down the most common path.
6769 typedef Unordered_map<unsigned int, unsigned int> Reloc_map;
6770 Reloc_map reloc_map;
6771 ps = pshdrs + shdr_size;
6772 for (unsigned int i = 1; i < this->shnum(); ++i, ps += shdr_size)
6774 elfcpp::Shdr<32, big_endian> shdr(ps);
6775 elfcpp::Elf_Word sh_type = shdr.get_sh_type();
6776 if (sh_type == elfcpp::SHT_REL || sh_type == elfcpp::SHT_RELA)
6778 unsigned int info_shndx = this->adjust_shndx(shdr.get_sh_info());
6779 if (info_shndx >= this->shnum())
6780 gold_error(_("relocation section %u has invalid info %u"),
6782 Reloc_map::value_type value(info_shndx, i);
6783 std::pair<Reloc_map::iterator, bool> result =
6784 reloc_map.insert(value);
6786 gold_error(_("section %u has multiple relocation sections "
6788 info_shndx, i, reloc_map[info_shndx]);
6792 // Read the symbol table section header.
6793 const unsigned int symtab_shndx = this->symtab_shndx();
6794 elfcpp::Shdr<32, big_endian>
6795 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
6796 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
6798 // Read the local symbols.
6799 const int sym_size =elfcpp::Elf_sizes<32>::sym_size;
6800 const unsigned int loccount = this->local_symbol_count();
6801 gold_assert(loccount == symtabshdr.get_sh_info());
6802 off_t locsize = loccount * sym_size;
6803 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
6804 locsize, true, true);
6806 // Process the deferred EXIDX sections.
6807 for (unsigned int i = 0; i < deferred_exidx_sections.size(); ++i)
6809 unsigned int shndx = deferred_exidx_sections[i];
6810 elfcpp::Shdr<32, big_endian> shdr(pshdrs + shndx * shdr_size);
6811 unsigned int text_shndx = elfcpp::SHN_UNDEF;
6812 Reloc_map::const_iterator it = reloc_map.find(shndx);
6813 if (it != reloc_map.end())
6814 find_linked_text_section(pshdrs + it->second * shdr_size,
6815 psyms, &text_shndx);
6816 elfcpp::Shdr<32, big_endian> text_shdr(pshdrs
6817 + text_shndx * shdr_size);
6818 this->make_exidx_input_section(shndx, shdr, text_shndx, text_shdr);
6823 // Process relocations for garbage collection. The ARM target uses .ARM.exidx
6824 // sections for unwinding. These sections are referenced implicitly by
6825 // text sections linked in the section headers. If we ignore these implicit
6826 // references, the .ARM.exidx sections and any .ARM.extab sections they use
6827 // will be garbage-collected incorrectly. Hence we override the same function
6828 // in the base class to handle these implicit references.
6830 template<bool big_endian>
6832 Arm_relobj<big_endian>::do_gc_process_relocs(Symbol_table* symtab,
6834 Read_relocs_data* rd)
6836 // First, call base class method to process relocations in this object.
6837 Sized_relobj_file<32, big_endian>::do_gc_process_relocs(symtab, layout, rd);
6839 // If --gc-sections is not specified, there is nothing more to do.
6840 // This happens when --icf is used but --gc-sections is not.
6841 if (!parameters->options().gc_sections())
6844 unsigned int shnum = this->shnum();
6845 const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6846 const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
6850 // Scan section headers for sections of type SHT_ARM_EXIDX. Add references
6851 // to these from the linked text sections.
6852 const unsigned char* ps = pshdrs + shdr_size;
6853 for (unsigned int i = 1; i < shnum; ++i, ps += shdr_size)
6855 elfcpp::Shdr<32, big_endian> shdr(ps);
6856 if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX)
6858 // Found an .ARM.exidx section, add it to the set of reachable
6859 // sections from its linked text section.
6860 unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link());
6861 symtab->gc()->add_reference(this, text_shndx, this, i);
6866 // Update output local symbol count. Owing to EXIDX entry merging, some local
6867 // symbols will be removed in output. Adjust output local symbol count
6868 // accordingly. We can only changed the static output local symbol count. It
6869 // is too late to change the dynamic symbols.
6871 template<bool big_endian>
6873 Arm_relobj<big_endian>::update_output_local_symbol_count()
6875 // Caller should check that this needs updating. We want caller checking
6876 // because output_local_symbol_count_needs_update() is most likely inlined.
6877 gold_assert(this->output_local_symbol_count_needs_update_);
6879 gold_assert(this->symtab_shndx() != -1U);
6880 if (this->symtab_shndx() == 0)
6882 // This object has no symbols. Weird but legal.
6886 // Read the symbol table section header.
6887 const unsigned int symtab_shndx = this->symtab_shndx();
6888 elfcpp::Shdr<32, big_endian>
6889 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
6890 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
6892 // Read the local symbols.
6893 const int sym_size = elfcpp::Elf_sizes<32>::sym_size;
6894 const unsigned int loccount = this->local_symbol_count();
6895 gold_assert(loccount == symtabshdr.get_sh_info());
6896 off_t locsize = loccount * sym_size;
6897 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
6898 locsize, true, true);
6900 // Loop over the local symbols.
6902 typedef typename Sized_relobj_file<32, big_endian>::Output_sections
6904 const Output_sections& out_sections(this->output_sections());
6905 unsigned int shnum = this->shnum();
6906 unsigned int count = 0;
6907 // Skip the first, dummy, symbol.
6909 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
6911 elfcpp::Sym<32, big_endian> sym(psyms);
6913 Symbol_value<32>& lv((*this->local_values())[i]);
6915 // This local symbol was already discarded by do_count_local_symbols.
6916 if (lv.is_output_symtab_index_set() && !lv.has_output_symtab_entry())
6920 unsigned int shndx = this->adjust_sym_shndx(i, sym.get_st_shndx(),
6925 Output_section* os = out_sections[shndx];
6927 // This local symbol no longer has an output section. Discard it.
6930 lv.set_no_output_symtab_entry();
6934 // Currently we only discard parts of EXIDX input sections.
6935 // We explicitly check for a merged EXIDX input section to avoid
6936 // calling Output_section_data::output_offset unless necessary.
6937 if ((this->get_output_section_offset(shndx) == invalid_address)
6938 && (this->exidx_input_section_by_shndx(shndx) != NULL))
6940 section_offset_type output_offset =
6941 os->output_offset(this, shndx, lv.input_value());
6942 if (output_offset == -1)
6944 // This symbol is defined in a part of an EXIDX input section
6945 // that is discarded due to entry merging.
6946 lv.set_no_output_symtab_entry();
6955 this->set_output_local_symbol_count(count);
6956 this->output_local_symbol_count_needs_update_ = false;
6959 // Arm_dynobj methods.
6961 // Read the symbol information.
6963 template<bool big_endian>
6965 Arm_dynobj<big_endian>::do_read_symbols(Read_symbols_data* sd)
6967 // Call parent class to read symbol information.
6968 Sized_dynobj<32, big_endian>::do_read_symbols(sd);
6970 // Read processor-specific flags in ELF file header.
6971 const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset,
6972 elfcpp::Elf_sizes<32>::ehdr_size,
6974 elfcpp::Ehdr<32, big_endian> ehdr(pehdr);
6975 this->processor_specific_flags_ = ehdr.get_e_flags();
6977 // Read the attributes section if there is one.
6978 // We read from the end because gas seems to put it near the end of
6979 // the section headers.
6980 const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
6981 const unsigned char* ps =
6982 sd->section_headers->data() + shdr_size * (this->shnum() - 1);
6983 for (unsigned int i = this->shnum(); i > 0; --i, ps -= shdr_size)
6985 elfcpp::Shdr<32, big_endian> shdr(ps);
6986 if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES)
6988 section_offset_type section_offset = shdr.get_sh_offset();
6989 section_size_type section_size =
6990 convert_to_section_size_type(shdr.get_sh_size());
6991 const unsigned char* view =
6992 this->get_view(section_offset, section_size, true, false);
6993 this->attributes_section_data_ =
6994 new Attributes_section_data(view, section_size);
7000 // Stub_addend_reader methods.
7002 // Read the addend of a REL relocation of type R_TYPE at VIEW.
7004 template<bool big_endian>
7005 elfcpp::Elf_types<32>::Elf_Swxword
7006 Stub_addend_reader<elfcpp::SHT_REL, big_endian>::operator()(
7007 unsigned int r_type,
7008 const unsigned char* view,
7009 const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const
7011 typedef class Arm_relocate_functions<big_endian> RelocFuncs;
7015 case elfcpp::R_ARM_CALL:
7016 case elfcpp::R_ARM_JUMP24:
7017 case elfcpp::R_ARM_PLT32:
7019 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
7020 const Valtype* wv = reinterpret_cast<const Valtype*>(view);
7021 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
7022 return Bits<26>::sign_extend32(val << 2);
7025 case elfcpp::R_ARM_THM_CALL:
7026 case elfcpp::R_ARM_THM_JUMP24:
7027 case elfcpp::R_ARM_THM_XPC22:
7029 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
7030 const Valtype* wv = reinterpret_cast<const Valtype*>(view);
7031 Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
7032 Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
7033 return RelocFuncs::thumb32_branch_offset(upper_insn, lower_insn);
7036 case elfcpp::R_ARM_THM_JUMP19:
7038 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
7039 const Valtype* wv = reinterpret_cast<const Valtype*>(view);
7040 Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
7041 Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
7042 return RelocFuncs::thumb32_cond_branch_offset(upper_insn, lower_insn);
7050 // Arm_output_data_got methods.
7052 // Add a GOT pair for R_ARM_TLS_GD32. The creates a pair of GOT entries.
7053 // The first one is initialized to be 1, which is the module index for
7054 // the main executable and the second one 0. A reloc of the type
7055 // R_ARM_TLS_DTPOFF32 will be created for the second GOT entry and will
7056 // be applied by gold. GSYM is a global symbol.
7058 template<bool big_endian>
7060 Arm_output_data_got<big_endian>::add_tls_gd32_with_static_reloc(
7061 unsigned int got_type,
7064 if (gsym->has_got_offset(got_type))
7067 // We are doing a static link. Just mark it as belong to module 1,
7069 unsigned int got_offset = this->add_constant(1);
7070 gsym->set_got_offset(got_type, got_offset);
7071 got_offset = this->add_constant(0);
7072 this->static_relocs_.push_back(Static_reloc(got_offset,
7073 elfcpp::R_ARM_TLS_DTPOFF32,
7077 // Same as the above but for a local symbol.
7079 template<bool big_endian>
7081 Arm_output_data_got<big_endian>::add_tls_gd32_with_static_reloc(
7082 unsigned int got_type,
7083 Sized_relobj_file<32, big_endian>* object,
7086 if (object->local_has_got_offset(index, got_type))
7089 // We are doing a static link. Just mark it as belong to module 1,
7091 unsigned int got_offset = this->add_constant(1);
7092 object->set_local_got_offset(index, got_type, got_offset);
7093 got_offset = this->add_constant(0);
7094 this->static_relocs_.push_back(Static_reloc(got_offset,
7095 elfcpp::R_ARM_TLS_DTPOFF32,
7099 template<bool big_endian>
7101 Arm_output_data_got<big_endian>::do_write(Output_file* of)
7103 // Call parent to write out GOT.
7104 Output_data_got<32, big_endian>::do_write(of);
7106 // We are done if there is no fix up.
7107 if (this->static_relocs_.empty())
7110 gold_assert(parameters->doing_static_link());
7112 const off_t offset = this->offset();
7113 const section_size_type oview_size =
7114 convert_to_section_size_type(this->data_size());
7115 unsigned char* const oview = of->get_output_view(offset, oview_size);
7117 Output_segment* tls_segment = this->layout_->tls_segment();
7118 gold_assert(tls_segment != NULL);
7120 // The thread pointer $tp points to the TCB, which is followed by the
7121 // TLS. So we need to adjust $tp relative addressing by this amount.
7122 Arm_address aligned_tcb_size =
7123 align_address(ARM_TCB_SIZE, tls_segment->maximum_alignment());
7125 for (size_t i = 0; i < this->static_relocs_.size(); ++i)
7127 Static_reloc& reloc(this->static_relocs_[i]);
7130 if (!reloc.symbol_is_global())
7132 Sized_relobj_file<32, big_endian>* object = reloc.relobj();
7133 const Symbol_value<32>* psymval =
7134 reloc.relobj()->local_symbol(reloc.index());
7136 // We are doing static linking. Issue an error and skip this
7137 // relocation if the symbol is undefined or in a discarded_section.
7139 unsigned int shndx = psymval->input_shndx(&is_ordinary);
7140 if ((shndx == elfcpp::SHN_UNDEF)
7142 && shndx != elfcpp::SHN_UNDEF
7143 && !object->is_section_included(shndx)
7144 && !this->symbol_table_->is_section_folded(object, shndx)))
7146 gold_error(_("undefined or discarded local symbol %u from "
7147 " object %s in GOT"),
7148 reloc.index(), reloc.relobj()->name().c_str());
7152 value = psymval->value(object, 0);
7156 const Symbol* gsym = reloc.symbol();
7157 gold_assert(gsym != NULL);
7158 if (gsym->is_forwarder())
7159 gsym = this->symbol_table_->resolve_forwards(gsym);
7161 // We are doing static linking. Issue an error and skip this
7162 // relocation if the symbol is undefined or in a discarded_section
7163 // unless it is a weakly_undefined symbol.
7164 if ((gsym->is_defined_in_discarded_section()
7165 || gsym->is_undefined())
7166 && !gsym->is_weak_undefined())
7168 gold_error(_("undefined or discarded symbol %s in GOT"),
7173 if (!gsym->is_weak_undefined())
7175 const Sized_symbol<32>* sym =
7176 static_cast<const Sized_symbol<32>*>(gsym);
7177 value = sym->value();
7183 unsigned got_offset = reloc.got_offset();
7184 gold_assert(got_offset < oview_size);
7186 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
7187 Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset);
7189 switch (reloc.r_type())
7191 case elfcpp::R_ARM_TLS_DTPOFF32:
7194 case elfcpp::R_ARM_TLS_TPOFF32:
7195 x = value + aligned_tcb_size;
7200 elfcpp::Swap<32, big_endian>::writeval(wv, x);
7203 of->write_output_view(offset, oview_size, oview);
7206 // A class to handle the PLT data.
7207 // This is an abstract base class that handles most of the linker details
7208 // but does not know the actual contents of PLT entries. The derived
7209 // classes below fill in those details.
7211 template<bool big_endian>
7212 class Output_data_plt_arm : public Output_section_data
7215 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian>
7218 Output_data_plt_arm(Layout*, uint64_t addralign, Output_data_space*);
7220 // Add an entry to the PLT.
7222 add_entry(Symbol* gsym);
7224 // Return the .rel.plt section data.
7225 const Reloc_section*
7227 { return this->rel_; }
7229 // Return the number of PLT entries.
7232 { return this->count_; }
7234 // Return the offset of the first non-reserved PLT entry.
7236 first_plt_entry_offset() const
7237 { return this->do_first_plt_entry_offset(); }
7239 // Return the size of a PLT entry.
7241 get_plt_entry_size() const
7242 { return this->do_get_plt_entry_size(); }
7245 // Fill in the first PLT entry.
7247 fill_first_plt_entry(unsigned char* pov,
7248 Arm_address got_address,
7249 Arm_address plt_address)
7250 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
7253 fill_plt_entry(unsigned char* pov,
7254 Arm_address got_address,
7255 Arm_address plt_address,
7256 unsigned int got_offset,
7257 unsigned int plt_offset)
7258 { do_fill_plt_entry(pov, got_address, plt_address, got_offset, plt_offset); }
7260 virtual unsigned int
7261 do_first_plt_entry_offset() const = 0;
7263 virtual unsigned int
7264 do_get_plt_entry_size() const = 0;
7267 do_fill_first_plt_entry(unsigned char* pov,
7268 Arm_address got_address,
7269 Arm_address plt_address) = 0;
7272 do_fill_plt_entry(unsigned char* pov,
7273 Arm_address got_address,
7274 Arm_address plt_address,
7275 unsigned int got_offset,
7276 unsigned int plt_offset) = 0;
7279 do_adjust_output_section(Output_section* os);
7281 // Write to a map file.
7283 do_print_to_mapfile(Mapfile* mapfile) const
7284 { mapfile->print_output_data(this, _("** PLT")); }
7287 // Set the final size.
7289 set_final_data_size()
7291 this->set_data_size(this->first_plt_entry_offset()
7292 + this->count_ * this->get_plt_entry_size());
7295 // Write out the PLT data.
7297 do_write(Output_file*);
7299 // The reloc section.
7300 Reloc_section* rel_;
7301 // The .got.plt section.
7302 Output_data_space* got_plt_;
7303 // The number of PLT entries.
7304 unsigned int count_;
7307 // Create the PLT section. The ordinary .got section is an argument,
7308 // since we need to refer to the start. We also create our own .got
7309 // section just for PLT entries.
7311 template<bool big_endian>
7312 Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout,
7314 Output_data_space* got_plt)
7315 : Output_section_data(addralign), got_plt_(got_plt), count_(0)
7317 this->rel_ = new Reloc_section(false);
7318 layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
7319 elfcpp::SHF_ALLOC, this->rel_,
7320 ORDER_DYNAMIC_PLT_RELOCS, false);
7323 template<bool big_endian>
7325 Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os)
7330 // Add an entry to the PLT.
7332 template<bool big_endian>
7334 Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym)
7336 gold_assert(!gsym->has_plt_offset());
7338 // Note that when setting the PLT offset we skip the initial
7339 // reserved PLT entry.
7340 gsym->set_plt_offset((this->count_) * this->get_plt_entry_size()
7341 + this->first_plt_entry_offset());
7345 section_offset_type got_offset = this->got_plt_->current_data_size();
7347 // Every PLT entry needs a GOT entry which points back to the PLT
7348 // entry (this will be changed by the dynamic linker, normally
7349 // lazily when the function is called).
7350 this->got_plt_->set_current_data_size(got_offset + 4);
7352 // Every PLT entry needs a reloc.
7353 gsym->set_needs_dynsym_entry();
7354 this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_,
7357 // Note that we don't need to save the symbol. The contents of the
7358 // PLT are independent of which symbols are used. The symbols only
7359 // appear in the relocations.
7362 template<bool big_endian>
7363 class Output_data_plt_arm_standard : public Output_data_plt_arm<big_endian>
7366 Output_data_plt_arm_standard(Layout* layout, Output_data_space* got_plt)
7367 : Output_data_plt_arm<big_endian>(layout, 4, got_plt)
7371 // Return the offset of the first non-reserved PLT entry.
7372 virtual unsigned int
7373 do_first_plt_entry_offset() const
7374 { return sizeof(first_plt_entry); }
7376 // Return the size of a PLT entry.
7377 virtual unsigned int
7378 do_get_plt_entry_size() const
7379 { return sizeof(plt_entry); }
7382 do_fill_first_plt_entry(unsigned char* pov,
7383 Arm_address got_address,
7384 Arm_address plt_address);
7387 do_fill_plt_entry(unsigned char* pov,
7388 Arm_address got_address,
7389 Arm_address plt_address,
7390 unsigned int got_offset,
7391 unsigned int plt_offset);
7394 // Template for the first PLT entry.
7395 static const uint32_t first_plt_entry[5];
7397 // Template for subsequent PLT entries.
7398 static const uint32_t plt_entry[3];
7402 // FIXME: This is not very flexible. Right now this has only been tested
7403 // on armv5te. If we are to support additional architecture features like
7404 // Thumb-2 or BE8, we need to make this more flexible like GNU ld.
7406 // The first entry in the PLT.
7407 template<bool big_endian>
7408 const uint32_t Output_data_plt_arm_standard<big_endian>::first_plt_entry[5] =
7410 0xe52de004, // str lr, [sp, #-4]!
7411 0xe59fe004, // ldr lr, [pc, #4]
7412 0xe08fe00e, // add lr, pc, lr
7413 0xe5bef008, // ldr pc, [lr, #8]!
7414 0x00000000, // &GOT[0] - .
7417 template<bool big_endian>
7419 Output_data_plt_arm_standard<big_endian>::do_fill_first_plt_entry(
7421 Arm_address got_address,
7422 Arm_address plt_address)
7424 // Write first PLT entry. All but the last word are constants.
7425 const size_t num_first_plt_words = (sizeof(first_plt_entry)
7426 / sizeof(plt_entry[0]));
7427 for (size_t i = 0; i < num_first_plt_words - 1; i++)
7428 elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]);
7429 // Last word in first PLT entry is &GOT[0] - .
7430 elfcpp::Swap<32, big_endian>::writeval(pov + 16,
7431 got_address - (plt_address + 16));
7434 // Subsequent entries in the PLT.
7436 template<bool big_endian>
7437 const uint32_t Output_data_plt_arm_standard<big_endian>::plt_entry[3] =
7439 0xe28fc600, // add ip, pc, #0xNN00000
7440 0xe28cca00, // add ip, ip, #0xNN000
7441 0xe5bcf000, // ldr pc, [ip, #0xNNN]!
7444 template<bool big_endian>
7446 Output_data_plt_arm_standard<big_endian>::do_fill_plt_entry(
7448 Arm_address got_address,
7449 Arm_address plt_address,
7450 unsigned int got_offset,
7451 unsigned int plt_offset)
7453 int32_t offset = ((got_address + got_offset)
7454 - (plt_address + plt_offset + 8));
7456 gold_assert(offset >= 0 && offset < 0x0fffffff);
7457 uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff);
7458 elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0);
7459 uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff);
7460 elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1);
7461 uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff);
7462 elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2);
7465 // Write out the PLT. This uses the hand-coded instructions above,
7466 // and adjusts them as needed. This is all specified by the arm ELF
7467 // Processor Supplement.
7469 template<bool big_endian>
7471 Output_data_plt_arm<big_endian>::do_write(Output_file* of)
7473 const off_t offset = this->offset();
7474 const section_size_type oview_size =
7475 convert_to_section_size_type(this->data_size());
7476 unsigned char* const oview = of->get_output_view(offset, oview_size);
7478 const off_t got_file_offset = this->got_plt_->offset();
7479 const section_size_type got_size =
7480 convert_to_section_size_type(this->got_plt_->data_size());
7481 unsigned char* const got_view = of->get_output_view(got_file_offset,
7483 unsigned char* pov = oview;
7485 Arm_address plt_address = this->address();
7486 Arm_address got_address = this->got_plt_->address();
7488 // Write first PLT entry.
7489 this->fill_first_plt_entry(pov, got_address, plt_address);
7490 pov += this->first_plt_entry_offset();
7492 unsigned char* got_pov = got_view;
7494 memset(got_pov, 0, 12);
7497 unsigned int plt_offset = this->first_plt_entry_offset();
7498 unsigned int got_offset = 12;
7499 const unsigned int count = this->count_;
7500 for (unsigned int i = 0;
7503 pov += this->get_plt_entry_size(),
7505 plt_offset += this->get_plt_entry_size(),
7508 // Set and adjust the PLT entry itself.
7509 this->fill_plt_entry(pov, got_address, plt_address,
7510 got_offset, plt_offset);
7512 // Set the entry in the GOT.
7513 elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address);
7516 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
7517 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
7519 of->write_output_view(offset, oview_size, oview);
7520 of->write_output_view(got_file_offset, got_size, got_view);
7523 // Create a PLT entry for a global symbol.
7525 template<bool big_endian>
7527 Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout,
7530 if (gsym->has_plt_offset())
7533 if (this->plt_ == NULL)
7535 // Create the GOT sections first.
7536 this->got_section(symtab, layout);
7538 this->plt_ = this->make_data_plt(layout, this->got_plt_);
7540 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
7542 | elfcpp::SHF_EXECINSTR),
7543 this->plt_, ORDER_PLT, false);
7545 this->plt_->add_entry(gsym);
7548 // Return the number of entries in the PLT.
7550 template<bool big_endian>
7552 Target_arm<big_endian>::plt_entry_count() const
7554 if (this->plt_ == NULL)
7556 return this->plt_->entry_count();
7559 // Return the offset of the first non-reserved PLT entry.
7561 template<bool big_endian>
7563 Target_arm<big_endian>::first_plt_entry_offset() const
7565 return this->plt_->first_plt_entry_offset();
7568 // Return the size of each PLT entry.
7570 template<bool big_endian>
7572 Target_arm<big_endian>::plt_entry_size() const
7574 return this->plt_->get_plt_entry_size();
7577 // Get the section to use for TLS_DESC relocations.
7579 template<bool big_endian>
7580 typename Target_arm<big_endian>::Reloc_section*
7581 Target_arm<big_endian>::rel_tls_desc_section(Layout* layout) const
7583 return this->plt_section()->rel_tls_desc(layout);
7586 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
7588 template<bool big_endian>
7590 Target_arm<big_endian>::define_tls_base_symbol(
7591 Symbol_table* symtab,
7594 if (this->tls_base_symbol_defined_)
7597 Output_segment* tls_segment = layout->tls_segment();
7598 if (tls_segment != NULL)
7600 bool is_exec = parameters->options().output_is_executable();
7601 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
7602 Symbol_table::PREDEFINED,
7606 elfcpp::STV_HIDDEN, 0,
7608 ? Symbol::SEGMENT_END
7609 : Symbol::SEGMENT_START),
7612 this->tls_base_symbol_defined_ = true;
7615 // Create a GOT entry for the TLS module index.
7617 template<bool big_endian>
7619 Target_arm<big_endian>::got_mod_index_entry(
7620 Symbol_table* symtab,
7622 Sized_relobj_file<32, big_endian>* object)
7624 if (this->got_mod_index_offset_ == -1U)
7626 gold_assert(symtab != NULL && layout != NULL && object != NULL);
7627 Arm_output_data_got<big_endian>* got = this->got_section(symtab, layout);
7628 unsigned int got_offset;
7629 if (!parameters->doing_static_link())
7631 got_offset = got->add_constant(0);
7632 Reloc_section* rel_dyn = this->rel_dyn_section(layout);
7633 rel_dyn->add_local(object, 0, elfcpp::R_ARM_TLS_DTPMOD32, got,
7638 // We are doing a static link. Just mark it as belong to module 1,
7640 got_offset = got->add_constant(1);
7643 got->add_constant(0);
7644 this->got_mod_index_offset_ = got_offset;
7646 return this->got_mod_index_offset_;
7649 // Optimize the TLS relocation type based on what we know about the
7650 // symbol. IS_FINAL is true if the final address of this symbol is
7651 // known at link time.
7653 template<bool big_endian>
7654 tls::Tls_optimization
7655 Target_arm<big_endian>::optimize_tls_reloc(bool, int)
7657 // FIXME: Currently we do not do any TLS optimization.
7658 return tls::TLSOPT_NONE;
7661 // Get the Reference_flags for a particular relocation.
7663 template<bool big_endian>
7665 Target_arm<big_endian>::Scan::get_reference_flags(unsigned int r_type)
7669 case elfcpp::R_ARM_NONE:
7670 case elfcpp::R_ARM_V4BX:
7671 case elfcpp::R_ARM_GNU_VTENTRY:
7672 case elfcpp::R_ARM_GNU_VTINHERIT:
7673 // No symbol reference.
7676 case elfcpp::R_ARM_ABS32:
7677 case elfcpp::R_ARM_ABS16:
7678 case elfcpp::R_ARM_ABS12:
7679 case elfcpp::R_ARM_THM_ABS5:
7680 case elfcpp::R_ARM_ABS8:
7681 case elfcpp::R_ARM_BASE_ABS:
7682 case elfcpp::R_ARM_MOVW_ABS_NC:
7683 case elfcpp::R_ARM_MOVT_ABS:
7684 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
7685 case elfcpp::R_ARM_THM_MOVT_ABS:
7686 case elfcpp::R_ARM_ABS32_NOI:
7687 return Symbol::ABSOLUTE_REF;
7689 case elfcpp::R_ARM_REL32:
7690 case elfcpp::R_ARM_LDR_PC_G0:
7691 case elfcpp::R_ARM_SBREL32:
7692 case elfcpp::R_ARM_THM_PC8:
7693 case elfcpp::R_ARM_BASE_PREL:
7694 case elfcpp::R_ARM_MOVW_PREL_NC:
7695 case elfcpp::R_ARM_MOVT_PREL:
7696 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
7697 case elfcpp::R_ARM_THM_MOVT_PREL:
7698 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
7699 case elfcpp::R_ARM_THM_PC12:
7700 case elfcpp::R_ARM_REL32_NOI:
7701 case elfcpp::R_ARM_ALU_PC_G0_NC:
7702 case elfcpp::R_ARM_ALU_PC_G0:
7703 case elfcpp::R_ARM_ALU_PC_G1_NC:
7704 case elfcpp::R_ARM_ALU_PC_G1:
7705 case elfcpp::R_ARM_ALU_PC_G2:
7706 case elfcpp::R_ARM_LDR_PC_G1:
7707 case elfcpp::R_ARM_LDR_PC_G2:
7708 case elfcpp::R_ARM_LDRS_PC_G0:
7709 case elfcpp::R_ARM_LDRS_PC_G1:
7710 case elfcpp::R_ARM_LDRS_PC_G2:
7711 case elfcpp::R_ARM_LDC_PC_G0:
7712 case elfcpp::R_ARM_LDC_PC_G1:
7713 case elfcpp::R_ARM_LDC_PC_G2:
7714 case elfcpp::R_ARM_ALU_SB_G0_NC:
7715 case elfcpp::R_ARM_ALU_SB_G0:
7716 case elfcpp::R_ARM_ALU_SB_G1_NC:
7717 case elfcpp::R_ARM_ALU_SB_G1:
7718 case elfcpp::R_ARM_ALU_SB_G2:
7719 case elfcpp::R_ARM_LDR_SB_G0:
7720 case elfcpp::R_ARM_LDR_SB_G1:
7721 case elfcpp::R_ARM_LDR_SB_G2:
7722 case elfcpp::R_ARM_LDRS_SB_G0:
7723 case elfcpp::R_ARM_LDRS_SB_G1:
7724 case elfcpp::R_ARM_LDRS_SB_G2:
7725 case elfcpp::R_ARM_LDC_SB_G0:
7726 case elfcpp::R_ARM_LDC_SB_G1:
7727 case elfcpp::R_ARM_LDC_SB_G2:
7728 case elfcpp::R_ARM_MOVW_BREL_NC:
7729 case elfcpp::R_ARM_MOVT_BREL:
7730 case elfcpp::R_ARM_MOVW_BREL:
7731 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
7732 case elfcpp::R_ARM_THM_MOVT_BREL:
7733 case elfcpp::R_ARM_THM_MOVW_BREL:
7734 case elfcpp::R_ARM_GOTOFF32:
7735 case elfcpp::R_ARM_GOTOFF12:
7736 case elfcpp::R_ARM_SBREL31:
7737 return Symbol::RELATIVE_REF;
7739 case elfcpp::R_ARM_PLT32:
7740 case elfcpp::R_ARM_CALL:
7741 case elfcpp::R_ARM_JUMP24:
7742 case elfcpp::R_ARM_THM_CALL:
7743 case elfcpp::R_ARM_THM_JUMP24:
7744 case elfcpp::R_ARM_THM_JUMP19:
7745 case elfcpp::R_ARM_THM_JUMP6:
7746 case elfcpp::R_ARM_THM_JUMP11:
7747 case elfcpp::R_ARM_THM_JUMP8:
7748 // R_ARM_PREL31 is not used to relocate call/jump instructions but
7749 // in unwind tables. It may point to functions via PLTs.
7750 // So we treat it like call/jump relocations above.
7751 case elfcpp::R_ARM_PREL31:
7752 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
7754 case elfcpp::R_ARM_GOT_BREL:
7755 case elfcpp::R_ARM_GOT_ABS:
7756 case elfcpp::R_ARM_GOT_PREL:
7758 return Symbol::ABSOLUTE_REF;
7760 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
7761 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
7762 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
7763 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
7764 case elfcpp::R_ARM_TLS_LE32: // Local-exec
7765 return Symbol::TLS_REF;
7767 case elfcpp::R_ARM_TARGET1:
7768 case elfcpp::R_ARM_TARGET2:
7769 case elfcpp::R_ARM_COPY:
7770 case elfcpp::R_ARM_GLOB_DAT:
7771 case elfcpp::R_ARM_JUMP_SLOT:
7772 case elfcpp::R_ARM_RELATIVE:
7773 case elfcpp::R_ARM_PC24:
7774 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
7775 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
7776 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
7778 // Not expected. We will give an error later.
7783 // Report an unsupported relocation against a local symbol.
7785 template<bool big_endian>
7787 Target_arm<big_endian>::Scan::unsupported_reloc_local(
7788 Sized_relobj_file<32, big_endian>* object,
7789 unsigned int r_type)
7791 gold_error(_("%s: unsupported reloc %u against local symbol"),
7792 object->name().c_str(), r_type);
7795 // We are about to emit a dynamic relocation of type R_TYPE. If the
7796 // dynamic linker does not support it, issue an error. The GNU linker
7797 // only issues a non-PIC error for an allocated read-only section.
7798 // Here we know the section is allocated, but we don't know that it is
7799 // read-only. But we check for all the relocation types which the
7800 // glibc dynamic linker supports, so it seems appropriate to issue an
7801 // error even if the section is not read-only.
7803 template<bool big_endian>
7805 Target_arm<big_endian>::Scan::check_non_pic(Relobj* object,
7806 unsigned int r_type)
7810 // These are the relocation types supported by glibc for ARM.
7811 case elfcpp::R_ARM_RELATIVE:
7812 case elfcpp::R_ARM_COPY:
7813 case elfcpp::R_ARM_GLOB_DAT:
7814 case elfcpp::R_ARM_JUMP_SLOT:
7815 case elfcpp::R_ARM_ABS32:
7816 case elfcpp::R_ARM_ABS32_NOI:
7817 case elfcpp::R_ARM_PC24:
7818 // FIXME: The following 3 types are not supported by Android's dynamic
7820 case elfcpp::R_ARM_TLS_DTPMOD32:
7821 case elfcpp::R_ARM_TLS_DTPOFF32:
7822 case elfcpp::R_ARM_TLS_TPOFF32:
7827 // This prevents us from issuing more than one error per reloc
7828 // section. But we can still wind up issuing more than one
7829 // error per object file.
7830 if (this->issued_non_pic_error_)
7832 const Arm_reloc_property* reloc_property =
7833 arm_reloc_property_table->get_reloc_property(r_type);
7834 gold_assert(reloc_property != NULL);
7835 object->error(_("requires unsupported dynamic reloc %s; "
7836 "recompile with -fPIC"),
7837 reloc_property->name().c_str());
7838 this->issued_non_pic_error_ = true;
7842 case elfcpp::R_ARM_NONE:
7847 // Scan a relocation for a local symbol.
7848 // FIXME: This only handles a subset of relocation types used by Android
7849 // on ARM v5te devices.
7851 template<bool big_endian>
7853 Target_arm<big_endian>::Scan::local(Symbol_table* symtab,
7856 Sized_relobj_file<32, big_endian>* object,
7857 unsigned int data_shndx,
7858 Output_section* output_section,
7859 const elfcpp::Rel<32, big_endian>& reloc,
7860 unsigned int r_type,
7861 const elfcpp::Sym<32, big_endian>& lsym,
7867 r_type = get_real_reloc_type(r_type);
7870 case elfcpp::R_ARM_NONE:
7871 case elfcpp::R_ARM_V4BX:
7872 case elfcpp::R_ARM_GNU_VTENTRY:
7873 case elfcpp::R_ARM_GNU_VTINHERIT:
7876 case elfcpp::R_ARM_ABS32:
7877 case elfcpp::R_ARM_ABS32_NOI:
7878 // If building a shared library (or a position-independent
7879 // executable), we need to create a dynamic relocation for
7880 // this location. The relocation applied at link time will
7881 // apply the link-time value, so we flag the location with
7882 // an R_ARM_RELATIVE relocation so the dynamic loader can
7883 // relocate it easily.
7884 if (parameters->options().output_is_position_independent())
7886 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
7887 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7888 // If we are to add more other reloc types than R_ARM_ABS32,
7889 // we need to add check_non_pic(object, r_type) here.
7890 rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE,
7891 output_section, data_shndx,
7892 reloc.get_r_offset());
7896 case elfcpp::R_ARM_ABS16:
7897 case elfcpp::R_ARM_ABS12:
7898 case elfcpp::R_ARM_THM_ABS5:
7899 case elfcpp::R_ARM_ABS8:
7900 case elfcpp::R_ARM_BASE_ABS:
7901 case elfcpp::R_ARM_MOVW_ABS_NC:
7902 case elfcpp::R_ARM_MOVT_ABS:
7903 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
7904 case elfcpp::R_ARM_THM_MOVT_ABS:
7905 // If building a shared library (or a position-independent
7906 // executable), we need to create a dynamic relocation for
7907 // this location. Because the addend needs to remain in the
7908 // data section, we need to be careful not to apply this
7909 // relocation statically.
7910 if (parameters->options().output_is_position_independent())
7912 check_non_pic(object, r_type);
7913 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
7914 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7915 if (lsym.get_st_type() != elfcpp::STT_SECTION)
7916 rel_dyn->add_local(object, r_sym, r_type, output_section,
7917 data_shndx, reloc.get_r_offset());
7920 gold_assert(lsym.get_st_value() == 0);
7921 unsigned int shndx = lsym.get_st_shndx();
7923 shndx = object->adjust_sym_shndx(r_sym, shndx,
7926 object->error(_("section symbol %u has bad shndx %u"),
7929 rel_dyn->add_local_section(object, shndx,
7930 r_type, output_section,
7931 data_shndx, reloc.get_r_offset());
7936 case elfcpp::R_ARM_REL32:
7937 case elfcpp::R_ARM_LDR_PC_G0:
7938 case elfcpp::R_ARM_SBREL32:
7939 case elfcpp::R_ARM_THM_CALL:
7940 case elfcpp::R_ARM_THM_PC8:
7941 case elfcpp::R_ARM_BASE_PREL:
7942 case elfcpp::R_ARM_PLT32:
7943 case elfcpp::R_ARM_CALL:
7944 case elfcpp::R_ARM_JUMP24:
7945 case elfcpp::R_ARM_THM_JUMP24:
7946 case elfcpp::R_ARM_SBREL31:
7947 case elfcpp::R_ARM_PREL31:
7948 case elfcpp::R_ARM_MOVW_PREL_NC:
7949 case elfcpp::R_ARM_MOVT_PREL:
7950 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
7951 case elfcpp::R_ARM_THM_MOVT_PREL:
7952 case elfcpp::R_ARM_THM_JUMP19:
7953 case elfcpp::R_ARM_THM_JUMP6:
7954 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
7955 case elfcpp::R_ARM_THM_PC12:
7956 case elfcpp::R_ARM_REL32_NOI:
7957 case elfcpp::R_ARM_ALU_PC_G0_NC:
7958 case elfcpp::R_ARM_ALU_PC_G0:
7959 case elfcpp::R_ARM_ALU_PC_G1_NC:
7960 case elfcpp::R_ARM_ALU_PC_G1:
7961 case elfcpp::R_ARM_ALU_PC_G2:
7962 case elfcpp::R_ARM_LDR_PC_G1:
7963 case elfcpp::R_ARM_LDR_PC_G2:
7964 case elfcpp::R_ARM_LDRS_PC_G0:
7965 case elfcpp::R_ARM_LDRS_PC_G1:
7966 case elfcpp::R_ARM_LDRS_PC_G2:
7967 case elfcpp::R_ARM_LDC_PC_G0:
7968 case elfcpp::R_ARM_LDC_PC_G1:
7969 case elfcpp::R_ARM_LDC_PC_G2:
7970 case elfcpp::R_ARM_ALU_SB_G0_NC:
7971 case elfcpp::R_ARM_ALU_SB_G0:
7972 case elfcpp::R_ARM_ALU_SB_G1_NC:
7973 case elfcpp::R_ARM_ALU_SB_G1:
7974 case elfcpp::R_ARM_ALU_SB_G2:
7975 case elfcpp::R_ARM_LDR_SB_G0:
7976 case elfcpp::R_ARM_LDR_SB_G1:
7977 case elfcpp::R_ARM_LDR_SB_G2:
7978 case elfcpp::R_ARM_LDRS_SB_G0:
7979 case elfcpp::R_ARM_LDRS_SB_G1:
7980 case elfcpp::R_ARM_LDRS_SB_G2:
7981 case elfcpp::R_ARM_LDC_SB_G0:
7982 case elfcpp::R_ARM_LDC_SB_G1:
7983 case elfcpp::R_ARM_LDC_SB_G2:
7984 case elfcpp::R_ARM_MOVW_BREL_NC:
7985 case elfcpp::R_ARM_MOVT_BREL:
7986 case elfcpp::R_ARM_MOVW_BREL:
7987 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
7988 case elfcpp::R_ARM_THM_MOVT_BREL:
7989 case elfcpp::R_ARM_THM_MOVW_BREL:
7990 case elfcpp::R_ARM_THM_JUMP11:
7991 case elfcpp::R_ARM_THM_JUMP8:
7992 // We don't need to do anything for a relative addressing relocation
7993 // against a local symbol if it does not reference the GOT.
7996 case elfcpp::R_ARM_GOTOFF32:
7997 case elfcpp::R_ARM_GOTOFF12:
7998 // We need a GOT section:
7999 target->got_section(symtab, layout);
8002 case elfcpp::R_ARM_GOT_BREL:
8003 case elfcpp::R_ARM_GOT_PREL:
8005 // The symbol requires a GOT entry.
8006 Arm_output_data_got<big_endian>* got =
8007 target->got_section(symtab, layout);
8008 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8009 if (got->add_local(object, r_sym, GOT_TYPE_STANDARD))
8011 // If we are generating a shared object, we need to add a
8012 // dynamic RELATIVE relocation for this symbol's GOT entry.
8013 if (parameters->options().output_is_position_independent())
8015 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8016 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8017 rel_dyn->add_local_relative(
8018 object, r_sym, elfcpp::R_ARM_RELATIVE, got,
8019 object->local_got_offset(r_sym, GOT_TYPE_STANDARD));
8025 case elfcpp::R_ARM_TARGET1:
8026 case elfcpp::R_ARM_TARGET2:
8027 // This should have been mapped to another type already.
8029 case elfcpp::R_ARM_COPY:
8030 case elfcpp::R_ARM_GLOB_DAT:
8031 case elfcpp::R_ARM_JUMP_SLOT:
8032 case elfcpp::R_ARM_RELATIVE:
8033 // These are relocations which should only be seen by the
8034 // dynamic linker, and should never be seen here.
8035 gold_error(_("%s: unexpected reloc %u in object file"),
8036 object->name().c_str(), r_type);
8040 // These are initial TLS relocs, which are expected when
8042 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8043 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8044 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8045 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8046 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8048 bool output_is_shared = parameters->options().shared();
8049 const tls::Tls_optimization optimized_type
8050 = Target_arm<big_endian>::optimize_tls_reloc(!output_is_shared,
8054 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8055 if (optimized_type == tls::TLSOPT_NONE)
8057 // Create a pair of GOT entries for the module index and
8058 // dtv-relative offset.
8059 Arm_output_data_got<big_endian>* got
8060 = target->got_section(symtab, layout);
8061 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8062 unsigned int shndx = lsym.get_st_shndx();
8064 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
8067 object->error(_("local symbol %u has bad shndx %u"),
8072 if (!parameters->doing_static_link())
8073 got->add_local_pair_with_rel(object, r_sym, shndx,
8075 target->rel_dyn_section(layout),
8076 elfcpp::R_ARM_TLS_DTPMOD32);
8078 got->add_tls_gd32_with_static_reloc(GOT_TYPE_TLS_PAIR,
8082 // FIXME: TLS optimization not supported yet.
8086 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8087 if (optimized_type == tls::TLSOPT_NONE)
8089 // Create a GOT entry for the module index.
8090 target->got_mod_index_entry(symtab, layout, object);
8093 // FIXME: TLS optimization not supported yet.
8097 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8100 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8101 layout->set_has_static_tls();
8102 if (optimized_type == tls::TLSOPT_NONE)
8104 // Create a GOT entry for the tp-relative offset.
8105 Arm_output_data_got<big_endian>* got
8106 = target->got_section(symtab, layout);
8107 unsigned int r_sym =
8108 elfcpp::elf_r_sym<32>(reloc.get_r_info());
8109 if (!parameters->doing_static_link())
8110 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
8111 target->rel_dyn_section(layout),
8112 elfcpp::R_ARM_TLS_TPOFF32);
8113 else if (!object->local_has_got_offset(r_sym,
8114 GOT_TYPE_TLS_OFFSET))
8116 got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET);
8117 unsigned int got_offset =
8118 object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
8119 got->add_static_reloc(got_offset,
8120 elfcpp::R_ARM_TLS_TPOFF32, object,
8125 // FIXME: TLS optimization not supported yet.
8129 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8130 layout->set_has_static_tls();
8131 if (output_is_shared)
8133 // We need to create a dynamic relocation.
8134 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
8135 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
8136 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8137 rel_dyn->add_local(object, r_sym, elfcpp::R_ARM_TLS_TPOFF32,
8138 output_section, data_shndx,
8139 reloc.get_r_offset());
8149 case elfcpp::R_ARM_PC24:
8150 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
8151 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
8152 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
8154 unsupported_reloc_local(object, r_type);
8159 // Report an unsupported relocation against a global symbol.
8161 template<bool big_endian>
8163 Target_arm<big_endian>::Scan::unsupported_reloc_global(
8164 Sized_relobj_file<32, big_endian>* object,
8165 unsigned int r_type,
8168 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
8169 object->name().c_str(), r_type, gsym->demangled_name().c_str());
8172 template<bool big_endian>
8174 Target_arm<big_endian>::Scan::possible_function_pointer_reloc(
8175 unsigned int r_type)
8179 case elfcpp::R_ARM_PC24:
8180 case elfcpp::R_ARM_THM_CALL:
8181 case elfcpp::R_ARM_PLT32:
8182 case elfcpp::R_ARM_CALL:
8183 case elfcpp::R_ARM_JUMP24:
8184 case elfcpp::R_ARM_THM_JUMP24:
8185 case elfcpp::R_ARM_SBREL31:
8186 case elfcpp::R_ARM_PREL31:
8187 case elfcpp::R_ARM_THM_JUMP19:
8188 case elfcpp::R_ARM_THM_JUMP6:
8189 case elfcpp::R_ARM_THM_JUMP11:
8190 case elfcpp::R_ARM_THM_JUMP8:
8191 // All the relocations above are branches except SBREL31 and PREL31.
8195 // Be conservative and assume this is a function pointer.
8200 template<bool big_endian>
8202 Target_arm<big_endian>::Scan::local_reloc_may_be_function_pointer(
8205 Target_arm<big_endian>* target,
8206 Sized_relobj_file<32, big_endian>*,
8209 const elfcpp::Rel<32, big_endian>&,
8210 unsigned int r_type,
8211 const elfcpp::Sym<32, big_endian>&)
8213 r_type = target->get_real_reloc_type(r_type);
8214 return possible_function_pointer_reloc(r_type);
8217 template<bool big_endian>
8219 Target_arm<big_endian>::Scan::global_reloc_may_be_function_pointer(
8222 Target_arm<big_endian>* target,
8223 Sized_relobj_file<32, big_endian>*,
8226 const elfcpp::Rel<32, big_endian>&,
8227 unsigned int r_type,
8230 // GOT is not a function.
8231 if (strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0)
8234 r_type = target->get_real_reloc_type(r_type);
8235 return possible_function_pointer_reloc(r_type);
8238 // Scan a relocation for a global symbol.
8240 template<bool big_endian>
8242 Target_arm<big_endian>::Scan::global(Symbol_table* symtab,
8245 Sized_relobj_file<32, big_endian>* object,
8246 unsigned int data_shndx,
8247 Output_section* output_section,
8248 const elfcpp::Rel<32, big_endian>& reloc,
8249 unsigned int r_type,
8252 // A reference to _GLOBAL_OFFSET_TABLE_ implies that we need a got
8253 // section. We check here to avoid creating a dynamic reloc against
8254 // _GLOBAL_OFFSET_TABLE_.
8255 if (!target->has_got_section()
8256 && strcmp(gsym->name(), "_GLOBAL_OFFSET_TABLE_") == 0)
8257 target->got_section(symtab, layout);
8259 r_type = get_real_reloc_type(r_type);
8262 case elfcpp::R_ARM_NONE:
8263 case elfcpp::R_ARM_V4BX:
8264 case elfcpp::R_ARM_GNU_VTENTRY:
8265 case elfcpp::R_ARM_GNU_VTINHERIT:
8268 case elfcpp::R_ARM_ABS32:
8269 case elfcpp::R_ARM_ABS16:
8270 case elfcpp::R_ARM_ABS12:
8271 case elfcpp::R_ARM_THM_ABS5:
8272 case elfcpp::R_ARM_ABS8:
8273 case elfcpp::R_ARM_BASE_ABS:
8274 case elfcpp::R_ARM_MOVW_ABS_NC:
8275 case elfcpp::R_ARM_MOVT_ABS:
8276 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
8277 case elfcpp::R_ARM_THM_MOVT_ABS:
8278 case elfcpp::R_ARM_ABS32_NOI:
8279 // Absolute addressing relocations.
8281 // Make a PLT entry if necessary.
8282 if (this->symbol_needs_plt_entry(gsym))
8284 target->make_plt_entry(symtab, layout, gsym);
8285 // Since this is not a PC-relative relocation, we may be
8286 // taking the address of a function. In that case we need to
8287 // set the entry in the dynamic symbol table to the address of
8289 if (gsym->is_from_dynobj() && !parameters->options().shared())
8290 gsym->set_needs_dynsym_value();
8292 // Make a dynamic relocation if necessary.
8293 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
8295 if (gsym->may_need_copy_reloc())
8297 target->copy_reloc(symtab, layout, object,
8298 data_shndx, output_section, gsym, reloc);
8300 else if ((r_type == elfcpp::R_ARM_ABS32
8301 || r_type == elfcpp::R_ARM_ABS32_NOI)
8302 && gsym->can_use_relative_reloc(false))
8304 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8305 rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE,
8306 output_section, object,
8307 data_shndx, reloc.get_r_offset());
8311 check_non_pic(object, r_type);
8312 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8313 rel_dyn->add_global(gsym, r_type, output_section, object,
8314 data_shndx, reloc.get_r_offset());
8320 case elfcpp::R_ARM_GOTOFF32:
8321 case elfcpp::R_ARM_GOTOFF12:
8322 // We need a GOT section.
8323 target->got_section(symtab, layout);
8326 case elfcpp::R_ARM_REL32:
8327 case elfcpp::R_ARM_LDR_PC_G0:
8328 case elfcpp::R_ARM_SBREL32:
8329 case elfcpp::R_ARM_THM_PC8:
8330 case elfcpp::R_ARM_BASE_PREL:
8331 case elfcpp::R_ARM_MOVW_PREL_NC:
8332 case elfcpp::R_ARM_MOVT_PREL:
8333 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
8334 case elfcpp::R_ARM_THM_MOVT_PREL:
8335 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
8336 case elfcpp::R_ARM_THM_PC12:
8337 case elfcpp::R_ARM_REL32_NOI:
8338 case elfcpp::R_ARM_ALU_PC_G0_NC:
8339 case elfcpp::R_ARM_ALU_PC_G0:
8340 case elfcpp::R_ARM_ALU_PC_G1_NC:
8341 case elfcpp::R_ARM_ALU_PC_G1:
8342 case elfcpp::R_ARM_ALU_PC_G2:
8343 case elfcpp::R_ARM_LDR_PC_G1:
8344 case elfcpp::R_ARM_LDR_PC_G2:
8345 case elfcpp::R_ARM_LDRS_PC_G0:
8346 case elfcpp::R_ARM_LDRS_PC_G1:
8347 case elfcpp::R_ARM_LDRS_PC_G2:
8348 case elfcpp::R_ARM_LDC_PC_G0:
8349 case elfcpp::R_ARM_LDC_PC_G1:
8350 case elfcpp::R_ARM_LDC_PC_G2:
8351 case elfcpp::R_ARM_ALU_SB_G0_NC:
8352 case elfcpp::R_ARM_ALU_SB_G0:
8353 case elfcpp::R_ARM_ALU_SB_G1_NC:
8354 case elfcpp::R_ARM_ALU_SB_G1:
8355 case elfcpp::R_ARM_ALU_SB_G2:
8356 case elfcpp::R_ARM_LDR_SB_G0:
8357 case elfcpp::R_ARM_LDR_SB_G1:
8358 case elfcpp::R_ARM_LDR_SB_G2:
8359 case elfcpp::R_ARM_LDRS_SB_G0:
8360 case elfcpp::R_ARM_LDRS_SB_G1:
8361 case elfcpp::R_ARM_LDRS_SB_G2:
8362 case elfcpp::R_ARM_LDC_SB_G0:
8363 case elfcpp::R_ARM_LDC_SB_G1:
8364 case elfcpp::R_ARM_LDC_SB_G2:
8365 case elfcpp::R_ARM_MOVW_BREL_NC:
8366 case elfcpp::R_ARM_MOVT_BREL:
8367 case elfcpp::R_ARM_MOVW_BREL:
8368 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
8369 case elfcpp::R_ARM_THM_MOVT_BREL:
8370 case elfcpp::R_ARM_THM_MOVW_BREL:
8371 // Relative addressing relocations.
8373 // Make a dynamic relocation if necessary.
8374 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
8376 if (target->may_need_copy_reloc(gsym))
8378 target->copy_reloc(symtab, layout, object,
8379 data_shndx, output_section, gsym, reloc);
8383 check_non_pic(object, r_type);
8384 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8385 rel_dyn->add_global(gsym, r_type, output_section, object,
8386 data_shndx, reloc.get_r_offset());
8392 case elfcpp::R_ARM_THM_CALL:
8393 case elfcpp::R_ARM_PLT32:
8394 case elfcpp::R_ARM_CALL:
8395 case elfcpp::R_ARM_JUMP24:
8396 case elfcpp::R_ARM_THM_JUMP24:
8397 case elfcpp::R_ARM_SBREL31:
8398 case elfcpp::R_ARM_PREL31:
8399 case elfcpp::R_ARM_THM_JUMP19:
8400 case elfcpp::R_ARM_THM_JUMP6:
8401 case elfcpp::R_ARM_THM_JUMP11:
8402 case elfcpp::R_ARM_THM_JUMP8:
8403 // All the relocation above are branches except for the PREL31 ones.
8404 // A PREL31 relocation can point to a personality function in a shared
8405 // library. In that case we want to use a PLT because we want to
8406 // call the personality routine and the dynamic linkers we care about
8407 // do not support dynamic PREL31 relocations. An REL31 relocation may
8408 // point to a function whose unwinding behaviour is being described but
8409 // we will not mistakenly generate a PLT for that because we should use
8410 // a local section symbol.
8412 // If the symbol is fully resolved, this is just a relative
8413 // local reloc. Otherwise we need a PLT entry.
8414 if (gsym->final_value_is_known())
8416 // If building a shared library, we can also skip the PLT entry
8417 // if the symbol is defined in the output file and is protected
8419 if (gsym->is_defined()
8420 && !gsym->is_from_dynobj()
8421 && !gsym->is_preemptible())
8423 target->make_plt_entry(symtab, layout, gsym);
8426 case elfcpp::R_ARM_GOT_BREL:
8427 case elfcpp::R_ARM_GOT_ABS:
8428 case elfcpp::R_ARM_GOT_PREL:
8430 // The symbol requires a GOT entry.
8431 Arm_output_data_got<big_endian>* got =
8432 target->got_section(symtab, layout);
8433 if (gsym->final_value_is_known())
8434 got->add_global(gsym, GOT_TYPE_STANDARD);
8437 // If this symbol is not fully resolved, we need to add a
8438 // GOT entry with a dynamic relocation.
8439 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8440 if (gsym->is_from_dynobj()
8441 || gsym->is_undefined()
8442 || gsym->is_preemptible()
8443 || (gsym->visibility() == elfcpp::STV_PROTECTED
8444 && parameters->options().shared()))
8445 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
8446 rel_dyn, elfcpp::R_ARM_GLOB_DAT);
8449 if (got->add_global(gsym, GOT_TYPE_STANDARD))
8450 rel_dyn->add_global_relative(
8451 gsym, elfcpp::R_ARM_RELATIVE, got,
8452 gsym->got_offset(GOT_TYPE_STANDARD));
8458 case elfcpp::R_ARM_TARGET1:
8459 case elfcpp::R_ARM_TARGET2:
8460 // These should have been mapped to other types already.
8462 case elfcpp::R_ARM_COPY:
8463 case elfcpp::R_ARM_GLOB_DAT:
8464 case elfcpp::R_ARM_JUMP_SLOT:
8465 case elfcpp::R_ARM_RELATIVE:
8466 // These are relocations which should only be seen by the
8467 // dynamic linker, and should never be seen here.
8468 gold_error(_("%s: unexpected reloc %u in object file"),
8469 object->name().c_str(), r_type);
8472 // These are initial tls relocs, which are expected when
8474 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8475 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8476 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8477 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8478 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8480 const bool is_final = gsym->final_value_is_known();
8481 const tls::Tls_optimization optimized_type
8482 = Target_arm<big_endian>::optimize_tls_reloc(is_final, r_type);
8485 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
8486 if (optimized_type == tls::TLSOPT_NONE)
8488 // Create a pair of GOT entries for the module index and
8489 // dtv-relative offset.
8490 Arm_output_data_got<big_endian>* got
8491 = target->got_section(symtab, layout);
8492 if (!parameters->doing_static_link())
8493 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
8494 target->rel_dyn_section(layout),
8495 elfcpp::R_ARM_TLS_DTPMOD32,
8496 elfcpp::R_ARM_TLS_DTPOFF32);
8498 got->add_tls_gd32_with_static_reloc(GOT_TYPE_TLS_PAIR, gsym);
8501 // FIXME: TLS optimization not supported yet.
8505 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
8506 if (optimized_type == tls::TLSOPT_NONE)
8508 // Create a GOT entry for the module index.
8509 target->got_mod_index_entry(symtab, layout, object);
8512 // FIXME: TLS optimization not supported yet.
8516 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
8519 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
8520 layout->set_has_static_tls();
8521 if (optimized_type == tls::TLSOPT_NONE)
8523 // Create a GOT entry for the tp-relative offset.
8524 Arm_output_data_got<big_endian>* got
8525 = target->got_section(symtab, layout);
8526 if (!parameters->doing_static_link())
8527 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
8528 target->rel_dyn_section(layout),
8529 elfcpp::R_ARM_TLS_TPOFF32);
8530 else if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET))
8532 got->add_global(gsym, GOT_TYPE_TLS_OFFSET);
8533 unsigned int got_offset =
8534 gsym->got_offset(GOT_TYPE_TLS_OFFSET);
8535 got->add_static_reloc(got_offset,
8536 elfcpp::R_ARM_TLS_TPOFF32, gsym);
8540 // FIXME: TLS optimization not supported yet.
8544 case elfcpp::R_ARM_TLS_LE32: // Local-exec
8545 layout->set_has_static_tls();
8546 if (parameters->options().shared())
8548 // We need to create a dynamic relocation.
8549 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8550 rel_dyn->add_global(gsym, elfcpp::R_ARM_TLS_TPOFF32,
8551 output_section, object,
8552 data_shndx, reloc.get_r_offset());
8562 case elfcpp::R_ARM_PC24:
8563 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
8564 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
8565 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
8567 unsupported_reloc_global(object, r_type, gsym);
8572 // Process relocations for gc.
8574 template<bool big_endian>
8576 Target_arm<big_endian>::gc_process_relocs(
8577 Symbol_table* symtab,
8579 Sized_relobj_file<32, big_endian>* object,
8580 unsigned int data_shndx,
8582 const unsigned char* prelocs,
8584 Output_section* output_section,
8585 bool needs_special_offset_handling,
8586 size_t local_symbol_count,
8587 const unsigned char* plocal_symbols)
8589 typedef Target_arm<big_endian> Arm;
8590 typedef typename Target_arm<big_endian>::Scan Scan;
8592 gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan,
8593 typename Target_arm::Relocatable_size_for_reloc>(
8602 needs_special_offset_handling,
8607 // Scan relocations for a section.
8609 template<bool big_endian>
8611 Target_arm<big_endian>::scan_relocs(Symbol_table* symtab,
8613 Sized_relobj_file<32, big_endian>* object,
8614 unsigned int data_shndx,
8615 unsigned int sh_type,
8616 const unsigned char* prelocs,
8618 Output_section* output_section,
8619 bool needs_special_offset_handling,
8620 size_t local_symbol_count,
8621 const unsigned char* plocal_symbols)
8623 typedef typename Target_arm<big_endian>::Scan Scan;
8624 if (sh_type == elfcpp::SHT_RELA)
8626 gold_error(_("%s: unsupported RELA reloc section"),
8627 object->name().c_str());
8631 gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>(
8640 needs_special_offset_handling,
8645 // Finalize the sections.
8647 template<bool big_endian>
8649 Target_arm<big_endian>::do_finalize_sections(
8651 const Input_objects* input_objects,
8654 bool merged_any_attributes = false;
8655 // Merge processor-specific flags.
8656 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
8657 p != input_objects->relobj_end();
8660 Arm_relobj<big_endian>* arm_relobj =
8661 Arm_relobj<big_endian>::as_arm_relobj(*p);
8662 if (arm_relobj->merge_flags_and_attributes())
8664 this->merge_processor_specific_flags(
8666 arm_relobj->processor_specific_flags());
8667 this->merge_object_attributes(arm_relobj->name().c_str(),
8668 arm_relobj->attributes_section_data());
8669 merged_any_attributes = true;
8673 for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin();
8674 p != input_objects->dynobj_end();
8677 Arm_dynobj<big_endian>* arm_dynobj =
8678 Arm_dynobj<big_endian>::as_arm_dynobj(*p);
8679 this->merge_processor_specific_flags(
8681 arm_dynobj->processor_specific_flags());
8682 this->merge_object_attributes(arm_dynobj->name().c_str(),
8683 arm_dynobj->attributes_section_data());
8684 merged_any_attributes = true;
8687 // Create an empty uninitialized attribute section if we still don't have it
8688 // at this moment. This happens if there is no attributes sections in all
8690 if (this->attributes_section_data_ == NULL)
8691 this->attributes_section_data_ = new Attributes_section_data(NULL, 0);
8693 const Object_attribute* cpu_arch_attr =
8694 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch);
8695 // Check if we need to use Cortex-A8 workaround.
8696 if (parameters->options().user_set_fix_cortex_a8())
8697 this->fix_cortex_a8_ = parameters->options().fix_cortex_a8();
8700 // If neither --fix-cortex-a8 nor --no-fix-cortex-a8 is used, turn on
8701 // Cortex-A8 erratum workaround for ARMv7-A or ARMv7 with unknown
8703 const Object_attribute* cpu_arch_profile_attr =
8704 this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile);
8705 this->fix_cortex_a8_ =
8706 (cpu_arch_attr->int_value() == elfcpp::TAG_CPU_ARCH_V7
8707 && (cpu_arch_profile_attr->int_value() == 'A'
8708 || cpu_arch_profile_attr->int_value() == 0));
8711 // Check if we can use V4BX interworking.
8712 // The V4BX interworking stub contains BX instruction,
8713 // which is not specified for some profiles.
8714 if (this->fix_v4bx() == General_options::FIX_V4BX_INTERWORKING
8715 && !this->may_use_v4t_interworking())
8716 gold_error(_("unable to provide V4BX reloc interworking fix up; "
8717 "the target profile does not support BX instruction"));
8719 // Fill in some more dynamic tags.
8720 const Reloc_section* rel_plt = (this->plt_ == NULL
8722 : this->plt_->rel_plt());
8723 layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt,
8724 this->rel_dyn_, true, false);
8726 // Emit any relocs we saved in an attempt to avoid generating COPY
8728 if (this->copy_relocs_.any_saved_relocs())
8729 this->copy_relocs_.emit(this->rel_dyn_section(layout));
8731 // Handle the .ARM.exidx section.
8732 Output_section* exidx_section = layout->find_output_section(".ARM.exidx");
8734 if (!parameters->options().relocatable())
8736 if (exidx_section != NULL
8737 && exidx_section->type() == elfcpp::SHT_ARM_EXIDX)
8739 // For the ARM target, we need to add a PT_ARM_EXIDX segment for
8740 // the .ARM.exidx section.
8741 if (!layout->script_options()->saw_phdrs_clause())
8743 gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0,
8746 Output_segment* exidx_segment =
8747 layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R);
8748 exidx_segment->add_output_section_to_nonload(exidx_section,
8754 // Create an .ARM.attributes section if we have merged any attributes
8756 if (merged_any_attributes)
8758 Output_attributes_section_data* attributes_section =
8759 new Output_attributes_section_data(*this->attributes_section_data_);
8760 layout->add_output_section_data(".ARM.attributes",
8761 elfcpp::SHT_ARM_ATTRIBUTES, 0,
8762 attributes_section, ORDER_INVALID,
8766 // Fix up links in section EXIDX headers.
8767 for (Layout::Section_list::const_iterator p = layout->section_list().begin();
8768 p != layout->section_list().end();
8770 if ((*p)->type() == elfcpp::SHT_ARM_EXIDX)
8772 Arm_output_section<big_endian>* os =
8773 Arm_output_section<big_endian>::as_arm_output_section(*p);
8774 os->set_exidx_section_link();
8778 // Return whether a direct absolute static relocation needs to be applied.
8779 // In cases where Scan::local() or Scan::global() has created
8780 // a dynamic relocation other than R_ARM_RELATIVE, the addend
8781 // of the relocation is carried in the data, and we must not
8782 // apply the static relocation.
8784 template<bool big_endian>
8786 Target_arm<big_endian>::Relocate::should_apply_static_reloc(
8787 const Sized_symbol<32>* gsym,
8788 unsigned int r_type,
8790 Output_section* output_section)
8792 // If the output section is not allocated, then we didn't call
8793 // scan_relocs, we didn't create a dynamic reloc, and we must apply
8795 if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0)
8798 int ref_flags = Scan::get_reference_flags(r_type);
8800 // For local symbols, we will have created a non-RELATIVE dynamic
8801 // relocation only if (a) the output is position independent,
8802 // (b) the relocation is absolute (not pc- or segment-relative), and
8803 // (c) the relocation is not 32 bits wide.
8805 return !(parameters->options().output_is_position_independent()
8806 && (ref_flags & Symbol::ABSOLUTE_REF)
8809 // For global symbols, we use the same helper routines used in the
8810 // scan pass. If we did not create a dynamic relocation, or if we
8811 // created a RELATIVE dynamic relocation, we should apply the static
8813 bool has_dyn = gsym->needs_dynamic_reloc(ref_flags);
8814 bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF)
8815 && gsym->can_use_relative_reloc(ref_flags
8816 & Symbol::FUNCTION_CALL);
8817 return !has_dyn || is_rel;
8820 // Perform a relocation.
8822 template<bool big_endian>
8824 Target_arm<big_endian>::Relocate::relocate(
8825 const Relocate_info<32, big_endian>* relinfo,
8827 Output_section* output_section,
8829 const elfcpp::Rel<32, big_endian>& rel,
8830 unsigned int r_type,
8831 const Sized_symbol<32>* gsym,
8832 const Symbol_value<32>* psymval,
8833 unsigned char* view,
8834 Arm_address address,
8835 section_size_type view_size)
8837 typedef Arm_relocate_functions<big_endian> Arm_relocate_functions;
8839 r_type = get_real_reloc_type(r_type);
8840 const Arm_reloc_property* reloc_property =
8841 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
8842 if (reloc_property == NULL)
8844 std::string reloc_name =
8845 arm_reloc_property_table->reloc_name_in_error_message(r_type);
8846 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
8847 _("cannot relocate %s in object file"),
8848 reloc_name.c_str());
8852 const Arm_relobj<big_endian>* object =
8853 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
8855 // If the final branch target of a relocation is THUMB instruction, this
8856 // is 1. Otherwise it is 0.
8857 Arm_address thumb_bit = 0;
8858 Symbol_value<32> symval;
8859 bool is_weakly_undefined_without_plt = false;
8860 bool have_got_offset = false;
8861 unsigned int got_offset = 0;
8863 // If the relocation uses the GOT entry of a symbol instead of the symbol
8864 // itself, we don't care about whether the symbol is defined or what kind
8866 if (reloc_property->uses_got_entry())
8868 // Get the GOT offset.
8869 // The GOT pointer points to the end of the GOT section.
8870 // We need to subtract the size of the GOT section to get
8871 // the actual offset to use in the relocation.
8872 // TODO: We should move GOT offset computing code in TLS relocations
8876 case elfcpp::R_ARM_GOT_BREL:
8877 case elfcpp::R_ARM_GOT_PREL:
8880 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
8881 got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
8882 - target->got_size());
8886 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
8887 gold_assert(object->local_has_got_offset(r_sym,
8888 GOT_TYPE_STANDARD));
8889 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
8890 - target->got_size());
8892 have_got_offset = true;
8899 else if (relnum != Target_arm<big_endian>::fake_relnum_for_stubs)
8903 // This is a global symbol. Determine if we use PLT and if the
8904 // final target is THUMB.
8905 if (gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
8907 // This uses a PLT, change the symbol value.
8908 symval.set_output_value(target->plt_section()->address()
8909 + gsym->plt_offset());
8912 else if (gsym->is_weak_undefined())
8914 // This is a weakly undefined symbol and we do not use PLT
8915 // for this relocation. A branch targeting this symbol will
8916 // be converted into an NOP.
8917 is_weakly_undefined_without_plt = true;
8919 else if (gsym->is_undefined() && reloc_property->uses_symbol())
8921 // This relocation uses the symbol value but the symbol is
8922 // undefined. Exit early and have the caller reporting an
8928 // Set thumb bit if symbol:
8929 // -Has type STT_ARM_TFUNC or
8930 // -Has type STT_FUNC, is defined and with LSB in value set.
8932 (((gsym->type() == elfcpp::STT_ARM_TFUNC)
8933 || (gsym->type() == elfcpp::STT_FUNC
8934 && !gsym->is_undefined()
8935 && ((psymval->value(object, 0) & 1) != 0)))
8942 // This is a local symbol. Determine if the final target is THUMB.
8943 // We saved this information when all the local symbols were read.
8944 elfcpp::Elf_types<32>::Elf_WXword r_info = rel.get_r_info();
8945 unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
8946 thumb_bit = object->local_symbol_is_thumb_function(r_sym) ? 1 : 0;
8951 // This is a fake relocation synthesized for a stub. It does not have
8952 // a real symbol. We just look at the LSB of the symbol value to
8953 // determine if the target is THUMB or not.
8954 thumb_bit = ((psymval->value(object, 0) & 1) != 0);
8957 // Strip LSB if this points to a THUMB target.
8959 && reloc_property->uses_thumb_bit()
8960 && ((psymval->value(object, 0) & 1) != 0))
8962 Arm_address stripped_value =
8963 psymval->value(object, 0) & ~static_cast<Arm_address>(1);
8964 symval.set_output_value(stripped_value);
8968 // To look up relocation stubs, we need to pass the symbol table index of
8970 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
8972 // Get the addressing origin of the output segment defining the
8973 // symbol gsym if needed (AAELF 4.6.1.2 Relocation types).
8974 Arm_address sym_origin = 0;
8975 if (reloc_property->uses_symbol_base())
8977 if (r_type == elfcpp::R_ARM_BASE_ABS && gsym == NULL)
8978 // R_ARM_BASE_ABS with the NULL symbol will give the
8979 // absolute address of the GOT origin (GOT_ORG) (see ARM IHI
8980 // 0044C (AAELF): 4.6.1.8 Proxy generating relocations).
8981 sym_origin = target->got_plt_section()->address();
8982 else if (gsym == NULL)
8984 else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT)
8985 sym_origin = gsym->output_segment()->vaddr();
8986 else if (gsym->source() == Symbol::IN_OUTPUT_DATA)
8987 sym_origin = gsym->output_data()->address();
8989 // TODO: Assumes the segment base to be zero for the global symbols
8990 // till the proper support for the segment-base-relative addressing
8991 // will be implemented. This is consistent with GNU ld.
8994 // For relative addressing relocation, find out the relative address base.
8995 Arm_address relative_address_base = 0;
8996 switch(reloc_property->relative_address_base())
8998 case Arm_reloc_property::RAB_NONE:
8999 // Relocations with relative address bases RAB_TLS and RAB_tp are
9000 // handled by relocate_tls. So we do not need to do anything here.
9001 case Arm_reloc_property::RAB_TLS:
9002 case Arm_reloc_property::RAB_tp:
9004 case Arm_reloc_property::RAB_B_S:
9005 relative_address_base = sym_origin;
9007 case Arm_reloc_property::RAB_GOT_ORG:
9008 relative_address_base = target->got_plt_section()->address();
9010 case Arm_reloc_property::RAB_P:
9011 relative_address_base = address;
9013 case Arm_reloc_property::RAB_Pa:
9014 relative_address_base = address & 0xfffffffcU;
9020 typename Arm_relocate_functions::Status reloc_status =
9021 Arm_relocate_functions::STATUS_OKAY;
9022 bool check_overflow = reloc_property->checks_overflow();
9025 case elfcpp::R_ARM_NONE:
9028 case elfcpp::R_ARM_ABS8:
9029 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9030 reloc_status = Arm_relocate_functions::abs8(view, object, psymval);
9033 case elfcpp::R_ARM_ABS12:
9034 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9035 reloc_status = Arm_relocate_functions::abs12(view, object, psymval);
9038 case elfcpp::R_ARM_ABS16:
9039 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9040 reloc_status = Arm_relocate_functions::abs16(view, object, psymval);
9043 case elfcpp::R_ARM_ABS32:
9044 if (should_apply_static_reloc(gsym, r_type, true, output_section))
9045 reloc_status = Arm_relocate_functions::abs32(view, object, psymval,
9049 case elfcpp::R_ARM_ABS32_NOI:
9050 if (should_apply_static_reloc(gsym, r_type, true, output_section))
9051 // No thumb bit for this relocation: (S + A)
9052 reloc_status = Arm_relocate_functions::abs32(view, object, psymval,
9056 case elfcpp::R_ARM_MOVW_ABS_NC:
9057 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9058 reloc_status = Arm_relocate_functions::movw(view, object, psymval,
9063 case elfcpp::R_ARM_MOVT_ABS:
9064 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9065 reloc_status = Arm_relocate_functions::movt(view, object, psymval, 0);
9068 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
9069 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9070 reloc_status = Arm_relocate_functions::thm_movw(view, object, psymval,
9071 0, thumb_bit, false);
9074 case elfcpp::R_ARM_THM_MOVT_ABS:
9075 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9076 reloc_status = Arm_relocate_functions::thm_movt(view, object,
9080 case elfcpp::R_ARM_MOVW_PREL_NC:
9081 case elfcpp::R_ARM_MOVW_BREL_NC:
9082 case elfcpp::R_ARM_MOVW_BREL:
9084 Arm_relocate_functions::movw(view, object, psymval,
9085 relative_address_base, thumb_bit,
9089 case elfcpp::R_ARM_MOVT_PREL:
9090 case elfcpp::R_ARM_MOVT_BREL:
9092 Arm_relocate_functions::movt(view, object, psymval,
9093 relative_address_base);
9096 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
9097 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
9098 case elfcpp::R_ARM_THM_MOVW_BREL:
9100 Arm_relocate_functions::thm_movw(view, object, psymval,
9101 relative_address_base,
9102 thumb_bit, check_overflow);
9105 case elfcpp::R_ARM_THM_MOVT_PREL:
9106 case elfcpp::R_ARM_THM_MOVT_BREL:
9108 Arm_relocate_functions::thm_movt(view, object, psymval,
9109 relative_address_base);
9112 case elfcpp::R_ARM_REL32:
9113 reloc_status = Arm_relocate_functions::rel32(view, object, psymval,
9114 address, thumb_bit);
9117 case elfcpp::R_ARM_THM_ABS5:
9118 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9119 reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval);
9122 // Thumb long branches.
9123 case elfcpp::R_ARM_THM_CALL:
9124 case elfcpp::R_ARM_THM_XPC22:
9125 case elfcpp::R_ARM_THM_JUMP24:
9127 Arm_relocate_functions::thumb_branch_common(
9128 r_type, relinfo, view, gsym, object, r_sym, psymval, address,
9129 thumb_bit, is_weakly_undefined_without_plt);
9132 case elfcpp::R_ARM_GOTOFF32:
9134 Arm_address got_origin;
9135 got_origin = target->got_plt_section()->address();
9136 reloc_status = Arm_relocate_functions::rel32(view, object, psymval,
9137 got_origin, thumb_bit);
9141 case elfcpp::R_ARM_BASE_PREL:
9142 gold_assert(gsym != NULL);
9144 Arm_relocate_functions::base_prel(view, sym_origin, address);
9147 case elfcpp::R_ARM_BASE_ABS:
9148 if (should_apply_static_reloc(gsym, r_type, false, output_section))
9149 reloc_status = Arm_relocate_functions::base_abs(view, sym_origin);
9152 case elfcpp::R_ARM_GOT_BREL:
9153 gold_assert(have_got_offset);
9154 reloc_status = Arm_relocate_functions::got_brel(view, got_offset);
9157 case elfcpp::R_ARM_GOT_PREL:
9158 gold_assert(have_got_offset);
9159 // Get the address origin for GOT PLT, which is allocated right
9160 // after the GOT section, to calculate an absolute address of
9161 // the symbol GOT entry (got_origin + got_offset).
9162 Arm_address got_origin;
9163 got_origin = target->got_plt_section()->address();
9164 reloc_status = Arm_relocate_functions::got_prel(view,
9165 got_origin + got_offset,
9169 case elfcpp::R_ARM_PLT32:
9170 case elfcpp::R_ARM_CALL:
9171 case elfcpp::R_ARM_JUMP24:
9172 case elfcpp::R_ARM_XPC25:
9173 gold_assert(gsym == NULL
9174 || gsym->has_plt_offset()
9175 || gsym->final_value_is_known()
9176 || (gsym->is_defined()
9177 && !gsym->is_from_dynobj()
9178 && !gsym->is_preemptible()));
9180 Arm_relocate_functions::arm_branch_common(
9181 r_type, relinfo, view, gsym, object, r_sym, psymval, address,
9182 thumb_bit, is_weakly_undefined_without_plt);
9185 case elfcpp::R_ARM_THM_JUMP19:
9187 Arm_relocate_functions::thm_jump19(view, object, psymval, address,
9191 case elfcpp::R_ARM_THM_JUMP6:
9193 Arm_relocate_functions::thm_jump6(view, object, psymval, address);
9196 case elfcpp::R_ARM_THM_JUMP8:
9198 Arm_relocate_functions::thm_jump8(view, object, psymval, address);
9201 case elfcpp::R_ARM_THM_JUMP11:
9203 Arm_relocate_functions::thm_jump11(view, object, psymval, address);
9206 case elfcpp::R_ARM_PREL31:
9207 reloc_status = Arm_relocate_functions::prel31(view, object, psymval,
9208 address, thumb_bit);
9211 case elfcpp::R_ARM_V4BX:
9212 if (target->fix_v4bx() > General_options::FIX_V4BX_NONE)
9214 const bool is_v4bx_interworking =
9215 (target->fix_v4bx() == General_options::FIX_V4BX_INTERWORKING);
9217 Arm_relocate_functions::v4bx(relinfo, view, object, address,
9218 is_v4bx_interworking);
9222 case elfcpp::R_ARM_THM_PC8:
9224 Arm_relocate_functions::thm_pc8(view, object, psymval, address);
9227 case elfcpp::R_ARM_THM_PC12:
9229 Arm_relocate_functions::thm_pc12(view, object, psymval, address);
9232 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
9234 Arm_relocate_functions::thm_alu11(view, object, psymval, address,
9238 case elfcpp::R_ARM_ALU_PC_G0_NC:
9239 case elfcpp::R_ARM_ALU_PC_G0:
9240 case elfcpp::R_ARM_ALU_PC_G1_NC:
9241 case elfcpp::R_ARM_ALU_PC_G1:
9242 case elfcpp::R_ARM_ALU_PC_G2:
9243 case elfcpp::R_ARM_ALU_SB_G0_NC:
9244 case elfcpp::R_ARM_ALU_SB_G0:
9245 case elfcpp::R_ARM_ALU_SB_G1_NC:
9246 case elfcpp::R_ARM_ALU_SB_G1:
9247 case elfcpp::R_ARM_ALU_SB_G2:
9249 Arm_relocate_functions::arm_grp_alu(view, object, psymval,
9250 reloc_property->group_index(),
9251 relative_address_base,
9252 thumb_bit, check_overflow);
9255 case elfcpp::R_ARM_LDR_PC_G0:
9256 case elfcpp::R_ARM_LDR_PC_G1:
9257 case elfcpp::R_ARM_LDR_PC_G2:
9258 case elfcpp::R_ARM_LDR_SB_G0:
9259 case elfcpp::R_ARM_LDR_SB_G1:
9260 case elfcpp::R_ARM_LDR_SB_G2:
9262 Arm_relocate_functions::arm_grp_ldr(view, object, psymval,
9263 reloc_property->group_index(),
9264 relative_address_base);
9267 case elfcpp::R_ARM_LDRS_PC_G0:
9268 case elfcpp::R_ARM_LDRS_PC_G1:
9269 case elfcpp::R_ARM_LDRS_PC_G2:
9270 case elfcpp::R_ARM_LDRS_SB_G0:
9271 case elfcpp::R_ARM_LDRS_SB_G1:
9272 case elfcpp::R_ARM_LDRS_SB_G2:
9274 Arm_relocate_functions::arm_grp_ldrs(view, object, psymval,
9275 reloc_property->group_index(),
9276 relative_address_base);
9279 case elfcpp::R_ARM_LDC_PC_G0:
9280 case elfcpp::R_ARM_LDC_PC_G1:
9281 case elfcpp::R_ARM_LDC_PC_G2:
9282 case elfcpp::R_ARM_LDC_SB_G0:
9283 case elfcpp::R_ARM_LDC_SB_G1:
9284 case elfcpp::R_ARM_LDC_SB_G2:
9286 Arm_relocate_functions::arm_grp_ldc(view, object, psymval,
9287 reloc_property->group_index(),
9288 relative_address_base);
9291 // These are initial tls relocs, which are expected when
9293 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
9294 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
9295 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
9296 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
9297 case elfcpp::R_ARM_TLS_LE32: // Local-exec
9299 this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval,
9300 view, address, view_size);
9303 // The known and unknown unsupported and/or deprecated relocations.
9304 case elfcpp::R_ARM_PC24:
9305 case elfcpp::R_ARM_LDR_SBREL_11_0_NC:
9306 case elfcpp::R_ARM_ALU_SBREL_19_12_NC:
9307 case elfcpp::R_ARM_ALU_SBREL_27_20_CK:
9309 // Just silently leave the method. We should get an appropriate error
9310 // message in the scan methods.
9314 // Report any errors.
9315 switch (reloc_status)
9317 case Arm_relocate_functions::STATUS_OKAY:
9319 case Arm_relocate_functions::STATUS_OVERFLOW:
9320 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
9321 _("relocation overflow in %s"),
9322 reloc_property->name().c_str());
9324 case Arm_relocate_functions::STATUS_BAD_RELOC:
9325 gold_error_at_location(
9329 _("unexpected opcode while processing relocation %s"),
9330 reloc_property->name().c_str());
9339 // Perform a TLS relocation.
9341 template<bool big_endian>
9342 inline typename Arm_relocate_functions<big_endian>::Status
9343 Target_arm<big_endian>::Relocate::relocate_tls(
9344 const Relocate_info<32, big_endian>* relinfo,
9345 Target_arm<big_endian>* target,
9347 const elfcpp::Rel<32, big_endian>& rel,
9348 unsigned int r_type,
9349 const Sized_symbol<32>* gsym,
9350 const Symbol_value<32>* psymval,
9351 unsigned char* view,
9352 elfcpp::Elf_types<32>::Elf_Addr address,
9353 section_size_type /*view_size*/ )
9355 typedef Arm_relocate_functions<big_endian> ArmRelocFuncs;
9356 typedef Relocate_functions<32, big_endian> RelocFuncs;
9357 Output_segment* tls_segment = relinfo->layout->tls_segment();
9359 const Sized_relobj_file<32, big_endian>* object = relinfo->object;
9361 elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0);
9363 const bool is_final = (gsym == NULL
9364 ? !parameters->options().shared()
9365 : gsym->final_value_is_known());
9366 const tls::Tls_optimization optimized_type
9367 = Target_arm<big_endian>::optimize_tls_reloc(is_final, r_type);
9370 case elfcpp::R_ARM_TLS_GD32: // Global-dynamic
9372 unsigned int got_type = GOT_TYPE_TLS_PAIR;
9373 unsigned int got_offset;
9376 gold_assert(gsym->has_got_offset(got_type));
9377 got_offset = gsym->got_offset(got_type) - target->got_size();
9381 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
9382 gold_assert(object->local_has_got_offset(r_sym, got_type));
9383 got_offset = (object->local_got_offset(r_sym, got_type)
9384 - target->got_size());
9386 if (optimized_type == tls::TLSOPT_NONE)
9388 Arm_address got_entry =
9389 target->got_plt_section()->address() + got_offset;
9391 // Relocate the field with the PC relative offset of the pair of
9393 RelocFuncs::pcrel32_unaligned(view, got_entry, address);
9394 return ArmRelocFuncs::STATUS_OKAY;
9399 case elfcpp::R_ARM_TLS_LDM32: // Local-dynamic
9400 if (optimized_type == tls::TLSOPT_NONE)
9402 // Relocate the field with the offset of the GOT entry for
9403 // the module index.
9404 unsigned int got_offset;
9405 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
9406 - target->got_size());
9407 Arm_address got_entry =
9408 target->got_plt_section()->address() + got_offset;
9410 // Relocate the field with the PC relative offset of the pair of
9412 RelocFuncs::pcrel32_unaligned(view, got_entry, address);
9413 return ArmRelocFuncs::STATUS_OKAY;
9417 case elfcpp::R_ARM_TLS_LDO32: // Alternate local-dynamic
9418 RelocFuncs::rel32_unaligned(view, value);
9419 return ArmRelocFuncs::STATUS_OKAY;
9421 case elfcpp::R_ARM_TLS_IE32: // Initial-exec
9422 if (optimized_type == tls::TLSOPT_NONE)
9424 // Relocate the field with the offset of the GOT entry for
9425 // the tp-relative offset of the symbol.
9426 unsigned int got_type = GOT_TYPE_TLS_OFFSET;
9427 unsigned int got_offset;
9430 gold_assert(gsym->has_got_offset(got_type));
9431 got_offset = gsym->got_offset(got_type);
9435 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
9436 gold_assert(object->local_has_got_offset(r_sym, got_type));
9437 got_offset = object->local_got_offset(r_sym, got_type);
9440 // All GOT offsets are relative to the end of the GOT.
9441 got_offset -= target->got_size();
9443 Arm_address got_entry =
9444 target->got_plt_section()->address() + got_offset;
9446 // Relocate the field with the PC relative offset of the GOT entry.
9447 RelocFuncs::pcrel32_unaligned(view, got_entry, address);
9448 return ArmRelocFuncs::STATUS_OKAY;
9452 case elfcpp::R_ARM_TLS_LE32: // Local-exec
9453 // If we're creating a shared library, a dynamic relocation will
9454 // have been created for this location, so do not apply it now.
9455 if (!parameters->options().shared())
9457 gold_assert(tls_segment != NULL);
9459 // $tp points to the TCB, which is followed by the TLS, so we
9460 // need to add TCB size to the offset.
9461 Arm_address aligned_tcb_size =
9462 align_address(ARM_TCB_SIZE, tls_segment->maximum_alignment());
9463 RelocFuncs::rel32_unaligned(view, value + aligned_tcb_size);
9466 return ArmRelocFuncs::STATUS_OKAY;
9472 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
9473 _("unsupported reloc %u"),
9475 return ArmRelocFuncs::STATUS_BAD_RELOC;
9478 // Relocate section data.
9480 template<bool big_endian>
9482 Target_arm<big_endian>::relocate_section(
9483 const Relocate_info<32, big_endian>* relinfo,
9484 unsigned int sh_type,
9485 const unsigned char* prelocs,
9487 Output_section* output_section,
9488 bool needs_special_offset_handling,
9489 unsigned char* view,
9490 Arm_address address,
9491 section_size_type view_size,
9492 const Reloc_symbol_changes* reloc_symbol_changes)
9494 typedef typename Target_arm<big_endian>::Relocate Arm_relocate;
9495 gold_assert(sh_type == elfcpp::SHT_REL);
9497 // See if we are relocating a relaxed input section. If so, the view
9498 // covers the whole output section and we need to adjust accordingly.
9499 if (needs_special_offset_handling)
9501 const Output_relaxed_input_section* poris =
9502 output_section->find_relaxed_input_section(relinfo->object,
9503 relinfo->data_shndx);
9506 Arm_address section_address = poris->address();
9507 section_size_type section_size = poris->data_size();
9509 gold_assert((section_address >= address)
9510 && ((section_address + section_size)
9511 <= (address + view_size)));
9513 off_t offset = section_address - address;
9516 view_size = section_size;
9520 gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL,
9527 needs_special_offset_handling,
9531 reloc_symbol_changes);
9534 // Return the size of a relocation while scanning during a relocatable
9537 template<bool big_endian>
9539 Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc(
9540 unsigned int r_type,
9543 r_type = get_real_reloc_type(r_type);
9544 const Arm_reloc_property* arp =
9545 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
9550 std::string reloc_name =
9551 arm_reloc_property_table->reloc_name_in_error_message(r_type);
9552 gold_error(_("%s: unexpected %s in object file"),
9553 object->name().c_str(), reloc_name.c_str());
9558 // Scan the relocs during a relocatable link.
9560 template<bool big_endian>
9562 Target_arm<big_endian>::scan_relocatable_relocs(
9563 Symbol_table* symtab,
9565 Sized_relobj_file<32, big_endian>* object,
9566 unsigned int data_shndx,
9567 unsigned int sh_type,
9568 const unsigned char* prelocs,
9570 Output_section* output_section,
9571 bool needs_special_offset_handling,
9572 size_t local_symbol_count,
9573 const unsigned char* plocal_symbols,
9574 Relocatable_relocs* rr)
9576 gold_assert(sh_type == elfcpp::SHT_REL);
9578 typedef Arm_scan_relocatable_relocs<big_endian, elfcpp::SHT_REL,
9579 Relocatable_size_for_reloc> Scan_relocatable_relocs;
9581 gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL,
9582 Scan_relocatable_relocs>(
9590 needs_special_offset_handling,
9596 // Emit relocations for a section.
9598 template<bool big_endian>
9600 Target_arm<big_endian>::relocate_relocs(
9601 const Relocate_info<32, big_endian>* relinfo,
9602 unsigned int sh_type,
9603 const unsigned char* prelocs,
9605 Output_section* output_section,
9606 off_t offset_in_output_section,
9607 const Relocatable_relocs* rr,
9608 unsigned char* view,
9609 Arm_address view_address,
9610 section_size_type view_size,
9611 unsigned char* reloc_view,
9612 section_size_type reloc_view_size)
9614 gold_assert(sh_type == elfcpp::SHT_REL);
9616 gold::relocate_relocs<32, big_endian, elfcpp::SHT_REL>(
9621 offset_in_output_section,
9630 // Perform target-specific processing in a relocatable link. This is
9631 // only used if we use the relocation strategy RELOC_SPECIAL.
9633 template<bool big_endian>
9635 Target_arm<big_endian>::relocate_special_relocatable(
9636 const Relocate_info<32, big_endian>* relinfo,
9637 unsigned int sh_type,
9638 const unsigned char* preloc_in,
9640 Output_section* output_section,
9641 off_t offset_in_output_section,
9642 unsigned char* view,
9643 elfcpp::Elf_types<32>::Elf_Addr view_address,
9645 unsigned char* preloc_out)
9647 // We can only handle REL type relocation sections.
9648 gold_assert(sh_type == elfcpp::SHT_REL);
9650 typedef typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc Reltype;
9651 typedef typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc_write
9653 const Arm_address invalid_address = static_cast<Arm_address>(0) - 1;
9655 const Arm_relobj<big_endian>* object =
9656 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
9657 const unsigned int local_count = object->local_symbol_count();
9659 Reltype reloc(preloc_in);
9660 Reltype_write reloc_write(preloc_out);
9662 elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info();
9663 const unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
9664 const unsigned int r_type = elfcpp::elf_r_type<32>(r_info);
9666 const Arm_reloc_property* arp =
9667 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
9668 gold_assert(arp != NULL);
9670 // Get the new symbol index.
9671 // We only use RELOC_SPECIAL strategy in local relocations.
9672 gold_assert(r_sym < local_count);
9674 // We are adjusting a section symbol. We need to find
9675 // the symbol table index of the section symbol for
9676 // the output section corresponding to input section
9677 // in which this symbol is defined.
9679 unsigned int shndx = object->local_symbol_input_shndx(r_sym, &is_ordinary);
9680 gold_assert(is_ordinary);
9681 Output_section* os = object->output_section(shndx);
9682 gold_assert(os != NULL);
9683 gold_assert(os->needs_symtab_index());
9684 unsigned int new_symndx = os->symtab_index();
9686 // Get the new offset--the location in the output section where
9687 // this relocation should be applied.
9689 Arm_address offset = reloc.get_r_offset();
9690 Arm_address new_offset;
9691 if (offset_in_output_section != invalid_address)
9692 new_offset = offset + offset_in_output_section;
9695 section_offset_type sot_offset =
9696 convert_types<section_offset_type, Arm_address>(offset);
9697 section_offset_type new_sot_offset =
9698 output_section->output_offset(object, relinfo->data_shndx,
9700 gold_assert(new_sot_offset != -1);
9701 new_offset = new_sot_offset;
9704 // In an object file, r_offset is an offset within the section.
9705 // In an executable or dynamic object, generated by
9706 // --emit-relocs, r_offset is an absolute address.
9707 if (!parameters->options().relocatable())
9709 new_offset += view_address;
9710 if (offset_in_output_section != invalid_address)
9711 new_offset -= offset_in_output_section;
9714 reloc_write.put_r_offset(new_offset);
9715 reloc_write.put_r_info(elfcpp::elf_r_info<32>(new_symndx, r_type));
9717 // Handle the reloc addend.
9718 // The relocation uses a section symbol in the input file.
9719 // We are adjusting it to use a section symbol in the output
9720 // file. The input section symbol refers to some address in
9721 // the input section. We need the relocation in the output
9722 // file to refer to that same address. This adjustment to
9723 // the addend is the same calculation we use for a simple
9724 // absolute relocation for the input section symbol.
9726 const Symbol_value<32>* psymval = object->local_symbol(r_sym);
9728 // Handle THUMB bit.
9729 Symbol_value<32> symval;
9730 Arm_address thumb_bit =
9731 object->local_symbol_is_thumb_function(r_sym) ? 1 : 0;
9733 && arp->uses_thumb_bit()
9734 && ((psymval->value(object, 0) & 1) != 0))
9736 Arm_address stripped_value =
9737 psymval->value(object, 0) & ~static_cast<Arm_address>(1);
9738 symval.set_output_value(stripped_value);
9742 unsigned char* paddend = view + offset;
9743 typename Arm_relocate_functions<big_endian>::Status reloc_status =
9744 Arm_relocate_functions<big_endian>::STATUS_OKAY;
9747 case elfcpp::R_ARM_ABS8:
9748 reloc_status = Arm_relocate_functions<big_endian>::abs8(paddend, object,
9752 case elfcpp::R_ARM_ABS12:
9753 reloc_status = Arm_relocate_functions<big_endian>::abs12(paddend, object,
9757 case elfcpp::R_ARM_ABS16:
9758 reloc_status = Arm_relocate_functions<big_endian>::abs16(paddend, object,
9762 case elfcpp::R_ARM_THM_ABS5:
9763 reloc_status = Arm_relocate_functions<big_endian>::thm_abs5(paddend,
9768 case elfcpp::R_ARM_MOVW_ABS_NC:
9769 case elfcpp::R_ARM_MOVW_PREL_NC:
9770 case elfcpp::R_ARM_MOVW_BREL_NC:
9771 case elfcpp::R_ARM_MOVW_BREL:
9772 reloc_status = Arm_relocate_functions<big_endian>::movw(
9773 paddend, object, psymval, 0, thumb_bit, arp->checks_overflow());
9776 case elfcpp::R_ARM_THM_MOVW_ABS_NC:
9777 case elfcpp::R_ARM_THM_MOVW_PREL_NC:
9778 case elfcpp::R_ARM_THM_MOVW_BREL_NC:
9779 case elfcpp::R_ARM_THM_MOVW_BREL:
9780 reloc_status = Arm_relocate_functions<big_endian>::thm_movw(
9781 paddend, object, psymval, 0, thumb_bit, arp->checks_overflow());
9784 case elfcpp::R_ARM_THM_CALL:
9785 case elfcpp::R_ARM_THM_XPC22:
9786 case elfcpp::R_ARM_THM_JUMP24:
9788 Arm_relocate_functions<big_endian>::thumb_branch_common(
9789 r_type, relinfo, paddend, NULL, object, 0, psymval, 0, thumb_bit,
9793 case elfcpp::R_ARM_PLT32:
9794 case elfcpp::R_ARM_CALL:
9795 case elfcpp::R_ARM_JUMP24:
9796 case elfcpp::R_ARM_XPC25:
9798 Arm_relocate_functions<big_endian>::arm_branch_common(
9799 r_type, relinfo, paddend, NULL, object, 0, psymval, 0, thumb_bit,
9803 case elfcpp::R_ARM_THM_JUMP19:
9805 Arm_relocate_functions<big_endian>::thm_jump19(paddend, object,
9806 psymval, 0, thumb_bit);
9809 case elfcpp::R_ARM_THM_JUMP6:
9811 Arm_relocate_functions<big_endian>::thm_jump6(paddend, object, psymval,
9815 case elfcpp::R_ARM_THM_JUMP8:
9817 Arm_relocate_functions<big_endian>::thm_jump8(paddend, object, psymval,
9821 case elfcpp::R_ARM_THM_JUMP11:
9823 Arm_relocate_functions<big_endian>::thm_jump11(paddend, object, psymval,
9827 case elfcpp::R_ARM_PREL31:
9829 Arm_relocate_functions<big_endian>::prel31(paddend, object, psymval, 0,
9833 case elfcpp::R_ARM_THM_PC8:
9835 Arm_relocate_functions<big_endian>::thm_pc8(paddend, object, psymval,
9839 case elfcpp::R_ARM_THM_PC12:
9841 Arm_relocate_functions<big_endian>::thm_pc12(paddend, object, psymval,
9845 case elfcpp::R_ARM_THM_ALU_PREL_11_0:
9847 Arm_relocate_functions<big_endian>::thm_alu11(paddend, object, psymval,
9851 // These relocation truncate relocation results so we cannot handle them
9852 // in a relocatable link.
9853 case elfcpp::R_ARM_MOVT_ABS:
9854 case elfcpp::R_ARM_THM_MOVT_ABS:
9855 case elfcpp::R_ARM_MOVT_PREL:
9856 case elfcpp::R_ARM_MOVT_BREL:
9857 case elfcpp::R_ARM_THM_MOVT_PREL:
9858 case elfcpp::R_ARM_THM_MOVT_BREL:
9859 case elfcpp::R_ARM_ALU_PC_G0_NC:
9860 case elfcpp::R_ARM_ALU_PC_G0:
9861 case elfcpp::R_ARM_ALU_PC_G1_NC:
9862 case elfcpp::R_ARM_ALU_PC_G1:
9863 case elfcpp::R_ARM_ALU_PC_G2:
9864 case elfcpp::R_ARM_ALU_SB_G0_NC:
9865 case elfcpp::R_ARM_ALU_SB_G0:
9866 case elfcpp::R_ARM_ALU_SB_G1_NC:
9867 case elfcpp::R_ARM_ALU_SB_G1:
9868 case elfcpp::R_ARM_ALU_SB_G2:
9869 case elfcpp::R_ARM_LDR_PC_G0:
9870 case elfcpp::R_ARM_LDR_PC_G1:
9871 case elfcpp::R_ARM_LDR_PC_G2:
9872 case elfcpp::R_ARM_LDR_SB_G0:
9873 case elfcpp::R_ARM_LDR_SB_G1:
9874 case elfcpp::R_ARM_LDR_SB_G2:
9875 case elfcpp::R_ARM_LDRS_PC_G0:
9876 case elfcpp::R_ARM_LDRS_PC_G1:
9877 case elfcpp::R_ARM_LDRS_PC_G2:
9878 case elfcpp::R_ARM_LDRS_SB_G0:
9879 case elfcpp::R_ARM_LDRS_SB_G1:
9880 case elfcpp::R_ARM_LDRS_SB_G2:
9881 case elfcpp::R_ARM_LDC_PC_G0:
9882 case elfcpp::R_ARM_LDC_PC_G1:
9883 case elfcpp::R_ARM_LDC_PC_G2:
9884 case elfcpp::R_ARM_LDC_SB_G0:
9885 case elfcpp::R_ARM_LDC_SB_G1:
9886 case elfcpp::R_ARM_LDC_SB_G2:
9887 gold_error(_("cannot handle %s in a relocatable link"),
9888 arp->name().c_str());
9895 // Report any errors.
9896 switch (reloc_status)
9898 case Arm_relocate_functions<big_endian>::STATUS_OKAY:
9900 case Arm_relocate_functions<big_endian>::STATUS_OVERFLOW:
9901 gold_error_at_location(relinfo, relnum, reloc.get_r_offset(),
9902 _("relocation overflow in %s"),
9903 arp->name().c_str());
9905 case Arm_relocate_functions<big_endian>::STATUS_BAD_RELOC:
9906 gold_error_at_location(relinfo, relnum, reloc.get_r_offset(),
9907 _("unexpected opcode while processing relocation %s"),
9908 arp->name().c_str());
9915 // Return the value to use for a dynamic symbol which requires special
9916 // treatment. This is how we support equality comparisons of function
9917 // pointers across shared library boundaries, as described in the
9918 // processor specific ABI supplement.
9920 template<bool big_endian>
9922 Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const
9924 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
9925 return this->plt_section()->address() + gsym->plt_offset();
9928 // Map platform-specific relocs to real relocs
9930 template<bool big_endian>
9932 Target_arm<big_endian>::get_real_reloc_type(unsigned int r_type)
9936 case elfcpp::R_ARM_TARGET1:
9937 // This is either R_ARM_ABS32 or R_ARM_REL32;
9938 return elfcpp::R_ARM_ABS32;
9940 case elfcpp::R_ARM_TARGET2:
9941 // This can be any reloc type but usually is R_ARM_GOT_PREL
9942 return elfcpp::R_ARM_GOT_PREL;
9949 // Whether if two EABI versions V1 and V2 are compatible.
9951 template<bool big_endian>
9953 Target_arm<big_endian>::are_eabi_versions_compatible(
9954 elfcpp::Elf_Word v1,
9955 elfcpp::Elf_Word v2)
9957 // v4 and v5 are the same spec before and after it was released,
9958 // so allow mixing them.
9959 if ((v1 == elfcpp::EF_ARM_EABI_UNKNOWN || v2 == elfcpp::EF_ARM_EABI_UNKNOWN)
9960 || (v1 == elfcpp::EF_ARM_EABI_VER4 && v2 == elfcpp::EF_ARM_EABI_VER5)
9961 || (v1 == elfcpp::EF_ARM_EABI_VER5 && v2 == elfcpp::EF_ARM_EABI_VER4))
9967 // Combine FLAGS from an input object called NAME and the processor-specific
9968 // flags in the ELF header of the output. Much of this is adapted from the
9969 // processor-specific flags merging code in elf32_arm_merge_private_bfd_data
9970 // in bfd/elf32-arm.c.
9972 template<bool big_endian>
9974 Target_arm<big_endian>::merge_processor_specific_flags(
9975 const std::string& name,
9976 elfcpp::Elf_Word flags)
9978 if (this->are_processor_specific_flags_set())
9980 elfcpp::Elf_Word out_flags = this->processor_specific_flags();
9982 // Nothing to merge if flags equal to those in output.
9983 if (flags == out_flags)
9986 // Complain about various flag mismatches.
9987 elfcpp::Elf_Word version1 = elfcpp::arm_eabi_version(flags);
9988 elfcpp::Elf_Word version2 = elfcpp::arm_eabi_version(out_flags);
9989 if (!this->are_eabi_versions_compatible(version1, version2)
9990 && parameters->options().warn_mismatch())
9991 gold_error(_("Source object %s has EABI version %d but output has "
9992 "EABI version %d."),
9994 (flags & elfcpp::EF_ARM_EABIMASK) >> 24,
9995 (out_flags & elfcpp::EF_ARM_EABIMASK) >> 24);
9999 // If the input is the default architecture and had the default
10000 // flags then do not bother setting the flags for the output
10001 // architecture, instead allow future merges to do this. If no
10002 // future merges ever set these flags then they will retain their
10003 // uninitialised values, which surprise surprise, correspond
10004 // to the default values.
10008 // This is the first time, just copy the flags.
10009 // We only copy the EABI version for now.
10010 this->set_processor_specific_flags(flags & elfcpp::EF_ARM_EABIMASK);
10014 // Adjust ELF file header.
10015 template<bool big_endian>
10017 Target_arm<big_endian>::do_adjust_elf_header(
10018 unsigned char* view,
10021 gold_assert(len == elfcpp::Elf_sizes<32>::ehdr_size);
10023 elfcpp::Ehdr<32, big_endian> ehdr(view);
10024 unsigned char e_ident[elfcpp::EI_NIDENT];
10025 memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT);
10027 if (elfcpp::arm_eabi_version(this->processor_specific_flags())
10028 == elfcpp::EF_ARM_EABI_UNKNOWN)
10029 e_ident[elfcpp::EI_OSABI] = elfcpp::ELFOSABI_ARM;
10031 e_ident[elfcpp::EI_OSABI] = 0;
10032 e_ident[elfcpp::EI_ABIVERSION] = 0;
10034 // FIXME: Do EF_ARM_BE8 adjustment.
10036 elfcpp::Ehdr_write<32, big_endian> oehdr(view);
10037 oehdr.put_e_ident(e_ident);
10040 // do_make_elf_object to override the same function in the base class.
10041 // We need to use a target-specific sub-class of
10042 // Sized_relobj_file<32, big_endian> to store ARM specific information.
10043 // Hence we need to have our own ELF object creation.
10045 template<bool big_endian>
10047 Target_arm<big_endian>::do_make_elf_object(
10048 const std::string& name,
10049 Input_file* input_file,
10050 off_t offset, const elfcpp::Ehdr<32, big_endian>& ehdr)
10052 int et = ehdr.get_e_type();
10053 // ET_EXEC files are valid input for --just-symbols/-R,
10054 // and we treat them as relocatable objects.
10055 if (et == elfcpp::ET_REL
10056 || (et == elfcpp::ET_EXEC && input_file->just_symbols()))
10058 Arm_relobj<big_endian>* obj =
10059 new Arm_relobj<big_endian>(name, input_file, offset, ehdr);
10063 else if (et == elfcpp::ET_DYN)
10065 Sized_dynobj<32, big_endian>* obj =
10066 new Arm_dynobj<big_endian>(name, input_file, offset, ehdr);
10072 gold_error(_("%s: unsupported ELF file type %d"),
10078 // Read the architecture from the Tag_also_compatible_with attribute, if any.
10079 // Returns -1 if no architecture could be read.
10080 // This is adapted from get_secondary_compatible_arch() in bfd/elf32-arm.c.
10082 template<bool big_endian>
10084 Target_arm<big_endian>::get_secondary_compatible_arch(
10085 const Attributes_section_data* pasd)
10087 const Object_attribute* known_attributes =
10088 pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC);
10090 // Note: the tag and its argument below are uleb128 values, though
10091 // currently-defined values fit in one byte for each.
10092 const std::string& sv =
10093 known_attributes[elfcpp::Tag_also_compatible_with].string_value();
10095 && sv.data()[0] == elfcpp::Tag_CPU_arch
10096 && (sv.data()[1] & 128) != 128)
10097 return sv.data()[1];
10099 // This tag is "safely ignorable", so don't complain if it looks funny.
10103 // Set, or unset, the architecture of the Tag_also_compatible_with attribute.
10104 // The tag is removed if ARCH is -1.
10105 // This is adapted from set_secondary_compatible_arch() in bfd/elf32-arm.c.
10107 template<bool big_endian>
10109 Target_arm<big_endian>::set_secondary_compatible_arch(
10110 Attributes_section_data* pasd,
10113 Object_attribute* known_attributes =
10114 pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC);
10118 known_attributes[elfcpp::Tag_also_compatible_with].set_string_value("");
10122 // Note: the tag and its argument below are uleb128 values, though
10123 // currently-defined values fit in one byte for each.
10125 sv[0] = elfcpp::Tag_CPU_arch;
10126 gold_assert(arch != 0);
10130 known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(sv);
10133 // Combine two values for Tag_CPU_arch, taking secondary compatibility tags
10135 // This is adapted from tag_cpu_arch_combine() in bfd/elf32-arm.c.
10137 template<bool big_endian>
10139 Target_arm<big_endian>::tag_cpu_arch_combine(
10142 int* secondary_compat_out,
10144 int secondary_compat)
10146 #define T(X) elfcpp::TAG_CPU_ARCH_##X
10147 static const int v6t2[] =
10149 T(V6T2), // PRE_V4.
10159 static const int v6k[] =
10172 static const int v7[] =
10186 static const int v6_m[] =
10201 static const int v6s_m[] =
10217 static const int v7e_m[] =
10224 T(V7E_M), // V5TEJ.
10231 T(V7E_M), // V6S_M.
10234 static const int v4t_plus_v6_m[] =
10241 T(V5TEJ), // V5TEJ.
10248 T(V6S_M), // V6S_M.
10249 T(V7E_M), // V7E_M.
10250 T(V4T_PLUS_V6_M) // V4T plus V6_M.
10252 static const int* comb[] =
10260 // Pseudo-architecture.
10264 // Check we've not got a higher architecture than we know about.
10266 if (oldtag > elfcpp::MAX_TAG_CPU_ARCH || newtag > elfcpp::MAX_TAG_CPU_ARCH)
10268 gold_error(_("%s: unknown CPU architecture"), name);
10272 // Override old tag if we have a Tag_also_compatible_with on the output.
10274 if ((oldtag == T(V6_M) && *secondary_compat_out == T(V4T))
10275 || (oldtag == T(V4T) && *secondary_compat_out == T(V6_M)))
10276 oldtag = T(V4T_PLUS_V6_M);
10278 // And override the new tag if we have a Tag_also_compatible_with on the
10281 if ((newtag == T(V6_M) && secondary_compat == T(V4T))
10282 || (newtag == T(V4T) && secondary_compat == T(V6_M)))
10283 newtag = T(V4T_PLUS_V6_M);
10285 // Architectures before V6KZ add features monotonically.
10286 int tagh = std::max(oldtag, newtag);
10287 if (tagh <= elfcpp::TAG_CPU_ARCH_V6KZ)
10290 int tagl = std::min(oldtag, newtag);
10291 int result = comb[tagh - T(V6T2)][tagl];
10293 // Use Tag_CPU_arch == V4T and Tag_also_compatible_with (Tag_CPU_arch V6_M)
10294 // as the canonical version.
10295 if (result == T(V4T_PLUS_V6_M))
10298 *secondary_compat_out = T(V6_M);
10301 *secondary_compat_out = -1;
10305 gold_error(_("%s: conflicting CPU architectures %d/%d"),
10306 name, oldtag, newtag);
10314 // Helper to print AEABI enum tag value.
10316 template<bool big_endian>
10318 Target_arm<big_endian>::aeabi_enum_name(unsigned int value)
10320 static const char* aeabi_enum_names[] =
10321 { "", "variable-size", "32-bit", "" };
10322 const size_t aeabi_enum_names_size =
10323 sizeof(aeabi_enum_names) / sizeof(aeabi_enum_names[0]);
10325 if (value < aeabi_enum_names_size)
10326 return std::string(aeabi_enum_names[value]);
10330 sprintf(buffer, "<unknown value %u>", value);
10331 return std::string(buffer);
10335 // Return the string value to store in TAG_CPU_name.
10337 template<bool big_endian>
10339 Target_arm<big_endian>::tag_cpu_name_value(unsigned int value)
10341 static const char* name_table[] = {
10342 // These aren't real CPU names, but we can't guess
10343 // that from the architecture version alone.
10359 const size_t name_table_size = sizeof(name_table) / sizeof(name_table[0]);
10361 if (value < name_table_size)
10362 return std::string(name_table[value]);
10366 sprintf(buffer, "<unknown CPU value %u>", value);
10367 return std::string(buffer);
10371 // Merge object attributes from input file called NAME with those of the
10372 // output. The input object attributes are in the object pointed by PASD.
10374 template<bool big_endian>
10376 Target_arm<big_endian>::merge_object_attributes(
10378 const Attributes_section_data* pasd)
10380 // Return if there is no attributes section data.
10384 // If output has no object attributes, just copy.
10385 const int vendor = Object_attribute::OBJ_ATTR_PROC;
10386 if (this->attributes_section_data_ == NULL)
10388 this->attributes_section_data_ = new Attributes_section_data(*pasd);
10389 Object_attribute* out_attr =
10390 this->attributes_section_data_->known_attributes(vendor);
10392 // We do not output objects with Tag_MPextension_use_legacy - we move
10393 // the attribute's value to Tag_MPextension_use. */
10394 if (out_attr[elfcpp::Tag_MPextension_use_legacy].int_value() != 0)
10396 if (out_attr[elfcpp::Tag_MPextension_use].int_value() != 0
10397 && out_attr[elfcpp::Tag_MPextension_use_legacy].int_value()
10398 != out_attr[elfcpp::Tag_MPextension_use].int_value())
10400 gold_error(_("%s has both the current and legacy "
10401 "Tag_MPextension_use attributes"),
10405 out_attr[elfcpp::Tag_MPextension_use] =
10406 out_attr[elfcpp::Tag_MPextension_use_legacy];
10407 out_attr[elfcpp::Tag_MPextension_use_legacy].set_type(0);
10408 out_attr[elfcpp::Tag_MPextension_use_legacy].set_int_value(0);
10414 const Object_attribute* in_attr = pasd->known_attributes(vendor);
10415 Object_attribute* out_attr =
10416 this->attributes_section_data_->known_attributes(vendor);
10418 // This needs to happen before Tag_ABI_FP_number_model is merged. */
10419 if (in_attr[elfcpp::Tag_ABI_VFP_args].int_value()
10420 != out_attr[elfcpp::Tag_ABI_VFP_args].int_value())
10422 // Ignore mismatches if the object doesn't use floating point. */
10423 if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0)
10424 out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value(
10425 in_attr[elfcpp::Tag_ABI_VFP_args].int_value());
10426 else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0
10427 && parameters->options().warn_mismatch())
10428 gold_error(_("%s uses VFP register arguments, output does not"),
10432 for (int i = 4; i < Vendor_object_attributes::NUM_KNOWN_ATTRIBUTES; ++i)
10434 // Merge this attribute with existing attributes.
10437 case elfcpp::Tag_CPU_raw_name:
10438 case elfcpp::Tag_CPU_name:
10439 // These are merged after Tag_CPU_arch.
10442 case elfcpp::Tag_ABI_optimization_goals:
10443 case elfcpp::Tag_ABI_FP_optimization_goals:
10444 // Use the first value seen.
10447 case elfcpp::Tag_CPU_arch:
10449 unsigned int saved_out_attr = out_attr->int_value();
10450 // Merge Tag_CPU_arch and Tag_also_compatible_with.
10451 int secondary_compat =
10452 this->get_secondary_compatible_arch(pasd);
10453 int secondary_compat_out =
10454 this->get_secondary_compatible_arch(
10455 this->attributes_section_data_);
10456 out_attr[i].set_int_value(
10457 tag_cpu_arch_combine(name, out_attr[i].int_value(),
10458 &secondary_compat_out,
10459 in_attr[i].int_value(),
10460 secondary_compat));
10461 this->set_secondary_compatible_arch(this->attributes_section_data_,
10462 secondary_compat_out);
10464 // Merge Tag_CPU_name and Tag_CPU_raw_name.
10465 if (out_attr[i].int_value() == saved_out_attr)
10466 ; // Leave the names alone.
10467 else if (out_attr[i].int_value() == in_attr[i].int_value())
10469 // The output architecture has been changed to match the
10470 // input architecture. Use the input names.
10471 out_attr[elfcpp::Tag_CPU_name].set_string_value(
10472 in_attr[elfcpp::Tag_CPU_name].string_value());
10473 out_attr[elfcpp::Tag_CPU_raw_name].set_string_value(
10474 in_attr[elfcpp::Tag_CPU_raw_name].string_value());
10478 out_attr[elfcpp::Tag_CPU_name].set_string_value("");
10479 out_attr[elfcpp::Tag_CPU_raw_name].set_string_value("");
10482 // If we still don't have a value for Tag_CPU_name,
10483 // make one up now. Tag_CPU_raw_name remains blank.
10484 if (out_attr[elfcpp::Tag_CPU_name].string_value() == "")
10486 const std::string cpu_name =
10487 this->tag_cpu_name_value(out_attr[i].int_value());
10488 // FIXME: If we see an unknown CPU, this will be set
10489 // to "<unknown CPU n>", where n is the attribute value.
10490 // This is different from BFD, which leaves the name alone.
10491 out_attr[elfcpp::Tag_CPU_name].set_string_value(cpu_name);
10496 case elfcpp::Tag_ARM_ISA_use:
10497 case elfcpp::Tag_THUMB_ISA_use:
10498 case elfcpp::Tag_WMMX_arch:
10499 case elfcpp::Tag_Advanced_SIMD_arch:
10500 // ??? Do Advanced_SIMD (NEON) and WMMX conflict?
10501 case elfcpp::Tag_ABI_FP_rounding:
10502 case elfcpp::Tag_ABI_FP_exceptions:
10503 case elfcpp::Tag_ABI_FP_user_exceptions:
10504 case elfcpp::Tag_ABI_FP_number_model:
10505 case elfcpp::Tag_VFP_HP_extension:
10506 case elfcpp::Tag_CPU_unaligned_access:
10507 case elfcpp::Tag_T2EE_use:
10508 case elfcpp::Tag_Virtualization_use:
10509 case elfcpp::Tag_MPextension_use:
10510 // Use the largest value specified.
10511 if (in_attr[i].int_value() > out_attr[i].int_value())
10512 out_attr[i].set_int_value(in_attr[i].int_value());
10515 case elfcpp::Tag_ABI_align8_preserved:
10516 case elfcpp::Tag_ABI_PCS_RO_data:
10517 // Use the smallest value specified.
10518 if (in_attr[i].int_value() < out_attr[i].int_value())
10519 out_attr[i].set_int_value(in_attr[i].int_value());
10522 case elfcpp::Tag_ABI_align8_needed:
10523 if ((in_attr[i].int_value() > 0 || out_attr[i].int_value() > 0)
10524 && (in_attr[elfcpp::Tag_ABI_align8_preserved].int_value() == 0
10525 || (out_attr[elfcpp::Tag_ABI_align8_preserved].int_value()
10528 // This error message should be enabled once all non-conforming
10529 // binaries in the toolchain have had the attributes set
10531 // gold_error(_("output 8-byte data alignment conflicts with %s"),
10535 case elfcpp::Tag_ABI_FP_denormal:
10536 case elfcpp::Tag_ABI_PCS_GOT_use:
10538 // These tags have 0 = don't care, 1 = strong requirement,
10539 // 2 = weak requirement.
10540 static const int order_021[3] = {0, 2, 1};
10542 // Use the "greatest" from the sequence 0, 2, 1, or the largest
10543 // value if greater than 2 (for future-proofing).
10544 if ((in_attr[i].int_value() > 2
10545 && in_attr[i].int_value() > out_attr[i].int_value())
10546 || (in_attr[i].int_value() <= 2
10547 && out_attr[i].int_value() <= 2
10548 && (order_021[in_attr[i].int_value()]
10549 > order_021[out_attr[i].int_value()])))
10550 out_attr[i].set_int_value(in_attr[i].int_value());
10554 case elfcpp::Tag_CPU_arch_profile:
10555 if (out_attr[i].int_value() != in_attr[i].int_value())
10557 // 0 will merge with anything.
10558 // 'A' and 'S' merge to 'A'.
10559 // 'R' and 'S' merge to 'R'.
10560 // 'M' and 'A|R|S' is an error.
10561 if (out_attr[i].int_value() == 0
10562 || (out_attr[i].int_value() == 'S'
10563 && (in_attr[i].int_value() == 'A'
10564 || in_attr[i].int_value() == 'R')))
10565 out_attr[i].set_int_value(in_attr[i].int_value());
10566 else if (in_attr[i].int_value() == 0
10567 || (in_attr[i].int_value() == 'S'
10568 && (out_attr[i].int_value() == 'A'
10569 || out_attr[i].int_value() == 'R')))
10571 else if (parameters->options().warn_mismatch())
10574 (_("conflicting architecture profiles %c/%c"),
10575 in_attr[i].int_value() ? in_attr[i].int_value() : '0',
10576 out_attr[i].int_value() ? out_attr[i].int_value() : '0');
10580 case elfcpp::Tag_VFP_arch:
10582 static const struct
10586 } vfp_versions[7] =
10597 // Values greater than 6 aren't defined, so just pick the
10599 if (in_attr[i].int_value() > 6
10600 && in_attr[i].int_value() > out_attr[i].int_value())
10602 *out_attr = *in_attr;
10605 // The output uses the superset of input features
10606 // (ISA version) and registers.
10607 int ver = std::max(vfp_versions[in_attr[i].int_value()].ver,
10608 vfp_versions[out_attr[i].int_value()].ver);
10609 int regs = std::max(vfp_versions[in_attr[i].int_value()].regs,
10610 vfp_versions[out_attr[i].int_value()].regs);
10611 // This assumes all possible supersets are also a valid
10614 for (newval = 6; newval > 0; newval--)
10616 if (regs == vfp_versions[newval].regs
10617 && ver == vfp_versions[newval].ver)
10620 out_attr[i].set_int_value(newval);
10623 case elfcpp::Tag_PCS_config:
10624 if (out_attr[i].int_value() == 0)
10625 out_attr[i].set_int_value(in_attr[i].int_value());
10626 else if (in_attr[i].int_value() != 0
10627 && out_attr[i].int_value() != 0
10628 && parameters->options().warn_mismatch())
10630 // It's sometimes ok to mix different configs, so this is only
10632 gold_warning(_("%s: conflicting platform configuration"), name);
10635 case elfcpp::Tag_ABI_PCS_R9_use:
10636 if (in_attr[i].int_value() != out_attr[i].int_value()
10637 && out_attr[i].int_value() != elfcpp::AEABI_R9_unused
10638 && in_attr[i].int_value() != elfcpp::AEABI_R9_unused
10639 && parameters->options().warn_mismatch())
10641 gold_error(_("%s: conflicting use of R9"), name);
10643 if (out_attr[i].int_value() == elfcpp::AEABI_R9_unused)
10644 out_attr[i].set_int_value(in_attr[i].int_value());
10646 case elfcpp::Tag_ABI_PCS_RW_data:
10647 if (in_attr[i].int_value() == elfcpp::AEABI_PCS_RW_data_SBrel
10648 && (in_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value()
10649 != elfcpp::AEABI_R9_SB)
10650 && (out_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value()
10651 != elfcpp::AEABI_R9_unused)
10652 && parameters->options().warn_mismatch())
10654 gold_error(_("%s: SB relative addressing conflicts with use "
10658 // Use the smallest value specified.
10659 if (in_attr[i].int_value() < out_attr[i].int_value())
10660 out_attr[i].set_int_value(in_attr[i].int_value());
10662 case elfcpp::Tag_ABI_PCS_wchar_t:
10663 if (out_attr[i].int_value()
10664 && in_attr[i].int_value()
10665 && out_attr[i].int_value() != in_attr[i].int_value()
10666 && parameters->options().warn_mismatch()
10667 && parameters->options().wchar_size_warning())
10669 gold_warning(_("%s uses %u-byte wchar_t yet the output is to "
10670 "use %u-byte wchar_t; use of wchar_t values "
10671 "across objects may fail"),
10672 name, in_attr[i].int_value(),
10673 out_attr[i].int_value());
10675 else if (in_attr[i].int_value() && !out_attr[i].int_value())
10676 out_attr[i].set_int_value(in_attr[i].int_value());
10678 case elfcpp::Tag_ABI_enum_size:
10679 if (in_attr[i].int_value() != elfcpp::AEABI_enum_unused)
10681 if (out_attr[i].int_value() == elfcpp::AEABI_enum_unused
10682 || out_attr[i].int_value() == elfcpp::AEABI_enum_forced_wide)
10684 // The existing object is compatible with anything.
10685 // Use whatever requirements the new object has.
10686 out_attr[i].set_int_value(in_attr[i].int_value());
10688 else if (in_attr[i].int_value() != elfcpp::AEABI_enum_forced_wide
10689 && out_attr[i].int_value() != in_attr[i].int_value()
10690 && parameters->options().warn_mismatch()
10691 && parameters->options().enum_size_warning())
10693 unsigned int in_value = in_attr[i].int_value();
10694 unsigned int out_value = out_attr[i].int_value();
10695 gold_warning(_("%s uses %s enums yet the output is to use "
10696 "%s enums; use of enum values across objects "
10699 this->aeabi_enum_name(in_value).c_str(),
10700 this->aeabi_enum_name(out_value).c_str());
10704 case elfcpp::Tag_ABI_VFP_args:
10707 case elfcpp::Tag_ABI_WMMX_args:
10708 if (in_attr[i].int_value() != out_attr[i].int_value()
10709 && parameters->options().warn_mismatch())
10711 gold_error(_("%s uses iWMMXt register arguments, output does "
10716 case Object_attribute::Tag_compatibility:
10717 // Merged in target-independent code.
10719 case elfcpp::Tag_ABI_HardFP_use:
10720 // 1 (SP) and 2 (DP) conflict, so combine to 3 (SP & DP).
10721 if ((in_attr[i].int_value() == 1 && out_attr[i].int_value() == 2)
10722 || (in_attr[i].int_value() == 2 && out_attr[i].int_value() == 1))
10723 out_attr[i].set_int_value(3);
10724 else if (in_attr[i].int_value() > out_attr[i].int_value())
10725 out_attr[i].set_int_value(in_attr[i].int_value());
10727 case elfcpp::Tag_ABI_FP_16bit_format:
10728 if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0)
10730 if (in_attr[i].int_value() != out_attr[i].int_value()
10731 && parameters->options().warn_mismatch())
10732 gold_error(_("fp16 format mismatch between %s and output"),
10735 if (in_attr[i].int_value() != 0)
10736 out_attr[i].set_int_value(in_attr[i].int_value());
10739 case elfcpp::Tag_DIV_use:
10740 // This tag is set to zero if we can use UDIV and SDIV in Thumb
10741 // mode on a v7-M or v7-R CPU; to one if we can not use UDIV or
10742 // SDIV at all; and to two if we can use UDIV or SDIV on a v7-A
10743 // CPU. We will merge as follows: If the input attribute's value
10744 // is one then the output attribute's value remains unchanged. If
10745 // the input attribute's value is zero or two then if the output
10746 // attribute's value is one the output value is set to the input
10747 // value, otherwise the output value must be the same as the
10749 if (in_attr[i].int_value() != 1 && out_attr[i].int_value() != 1)
10751 if (in_attr[i].int_value() != out_attr[i].int_value())
10753 gold_error(_("DIV usage mismatch between %s and output"),
10758 if (in_attr[i].int_value() != 1)
10759 out_attr[i].set_int_value(in_attr[i].int_value());
10763 case elfcpp::Tag_MPextension_use_legacy:
10764 // We don't output objects with Tag_MPextension_use_legacy - we
10765 // move the value to Tag_MPextension_use.
10766 if (in_attr[i].int_value() != 0
10767 && in_attr[elfcpp::Tag_MPextension_use].int_value() != 0)
10769 if (in_attr[elfcpp::Tag_MPextension_use].int_value()
10770 != in_attr[i].int_value())
10772 gold_error(_("%s has has both the current and legacy "
10773 "Tag_MPextension_use attributes"),
10778 if (in_attr[i].int_value()
10779 > out_attr[elfcpp::Tag_MPextension_use].int_value())
10780 out_attr[elfcpp::Tag_MPextension_use] = in_attr[i];
10784 case elfcpp::Tag_nodefaults:
10785 // This tag is set if it exists, but the value is unused (and is
10786 // typically zero). We don't actually need to do anything here -
10787 // the merge happens automatically when the type flags are merged
10790 case elfcpp::Tag_also_compatible_with:
10791 // Already done in Tag_CPU_arch.
10793 case elfcpp::Tag_conformance:
10794 // Keep the attribute if it matches. Throw it away otherwise.
10795 // No attribute means no claim to conform.
10796 if (in_attr[i].string_value() != out_attr[i].string_value())
10797 out_attr[i].set_string_value("");
10802 const char* err_object = NULL;
10804 // The "known_obj_attributes" table does contain some undefined
10805 // attributes. Ensure that there are unused.
10806 if (out_attr[i].int_value() != 0
10807 || out_attr[i].string_value() != "")
10808 err_object = "output";
10809 else if (in_attr[i].int_value() != 0
10810 || in_attr[i].string_value() != "")
10813 if (err_object != NULL
10814 && parameters->options().warn_mismatch())
10816 // Attribute numbers >=64 (mod 128) can be safely ignored.
10817 if ((i & 127) < 64)
10818 gold_error(_("%s: unknown mandatory EABI object attribute "
10822 gold_warning(_("%s: unknown EABI object attribute %d"),
10826 // Only pass on attributes that match in both inputs.
10827 if (!in_attr[i].matches(out_attr[i]))
10829 out_attr[i].set_int_value(0);
10830 out_attr[i].set_string_value("");
10835 // If out_attr was copied from in_attr then it won't have a type yet.
10836 if (in_attr[i].type() && !out_attr[i].type())
10837 out_attr[i].set_type(in_attr[i].type());
10840 // Merge Tag_compatibility attributes and any common GNU ones.
10841 this->attributes_section_data_->merge(name, pasd);
10843 // Check for any attributes not known on ARM.
10844 typedef Vendor_object_attributes::Other_attributes Other_attributes;
10845 const Other_attributes* in_other_attributes = pasd->other_attributes(vendor);
10846 Other_attributes::const_iterator in_iter = in_other_attributes->begin();
10847 Other_attributes* out_other_attributes =
10848 this->attributes_section_data_->other_attributes(vendor);
10849 Other_attributes::iterator out_iter = out_other_attributes->begin();
10851 while (in_iter != in_other_attributes->end()
10852 || out_iter != out_other_attributes->end())
10854 const char* err_object = NULL;
10857 // The tags for each list are in numerical order.
10858 // If the tags are equal, then merge.
10859 if (out_iter != out_other_attributes->end()
10860 && (in_iter == in_other_attributes->end()
10861 || in_iter->first > out_iter->first))
10863 // This attribute only exists in output. We can't merge, and we
10864 // don't know what the tag means, so delete it.
10865 err_object = "output";
10866 err_tag = out_iter->first;
10867 int saved_tag = out_iter->first;
10868 delete out_iter->second;
10869 out_other_attributes->erase(out_iter);
10870 out_iter = out_other_attributes->upper_bound(saved_tag);
10872 else if (in_iter != in_other_attributes->end()
10873 && (out_iter != out_other_attributes->end()
10874 || in_iter->first < out_iter->first))
10876 // This attribute only exists in input. We can't merge, and we
10877 // don't know what the tag means, so ignore it.
10879 err_tag = in_iter->first;
10882 else // The tags are equal.
10884 // As present, all attributes in the list are unknown, and
10885 // therefore can't be merged meaningfully.
10886 err_object = "output";
10887 err_tag = out_iter->first;
10889 // Only pass on attributes that match in both inputs.
10890 if (!in_iter->second->matches(*(out_iter->second)))
10892 // No match. Delete the attribute.
10893 int saved_tag = out_iter->first;
10894 delete out_iter->second;
10895 out_other_attributes->erase(out_iter);
10896 out_iter = out_other_attributes->upper_bound(saved_tag);
10900 // Matched. Keep the attribute and move to the next.
10906 if (err_object && parameters->options().warn_mismatch())
10908 // Attribute numbers >=64 (mod 128) can be safely ignored. */
10909 if ((err_tag & 127) < 64)
10911 gold_error(_("%s: unknown mandatory EABI object attribute %d"),
10912 err_object, err_tag);
10916 gold_warning(_("%s: unknown EABI object attribute %d"),
10917 err_object, err_tag);
10923 // Stub-generation methods for Target_arm.
10925 // Make a new Arm_input_section object.
10927 template<bool big_endian>
10928 Arm_input_section<big_endian>*
10929 Target_arm<big_endian>::new_arm_input_section(
10931 unsigned int shndx)
10933 Section_id sid(relobj, shndx);
10935 Arm_input_section<big_endian>* arm_input_section =
10936 new Arm_input_section<big_endian>(relobj, shndx);
10937 arm_input_section->init();
10939 // Register new Arm_input_section in map for look-up.
10940 std::pair<typename Arm_input_section_map::iterator, bool> ins =
10941 this->arm_input_section_map_.insert(std::make_pair(sid, arm_input_section));
10943 // Make sure that it we have not created another Arm_input_section
10944 // for this input section already.
10945 gold_assert(ins.second);
10947 return arm_input_section;
10950 // Find the Arm_input_section object corresponding to the SHNDX-th input
10951 // section of RELOBJ.
10953 template<bool big_endian>
10954 Arm_input_section<big_endian>*
10955 Target_arm<big_endian>::find_arm_input_section(
10957 unsigned int shndx) const
10959 Section_id sid(relobj, shndx);
10960 typename Arm_input_section_map::const_iterator p =
10961 this->arm_input_section_map_.find(sid);
10962 return (p != this->arm_input_section_map_.end()) ? p->second : NULL;
10965 // Make a new stub table.
10967 template<bool big_endian>
10968 Stub_table<big_endian>*
10969 Target_arm<big_endian>::new_stub_table(Arm_input_section<big_endian>* owner)
10971 Stub_table<big_endian>* stub_table =
10972 new Stub_table<big_endian>(owner);
10973 this->stub_tables_.push_back(stub_table);
10975 stub_table->set_address(owner->address() + owner->data_size());
10976 stub_table->set_file_offset(owner->offset() + owner->data_size());
10977 stub_table->finalize_data_size();
10982 // Scan a relocation for stub generation.
10984 template<bool big_endian>
10986 Target_arm<big_endian>::scan_reloc_for_stub(
10987 const Relocate_info<32, big_endian>* relinfo,
10988 unsigned int r_type,
10989 const Sized_symbol<32>* gsym,
10990 unsigned int r_sym,
10991 const Symbol_value<32>* psymval,
10992 elfcpp::Elf_types<32>::Elf_Swxword addend,
10993 Arm_address address)
10995 const Arm_relobj<big_endian>* arm_relobj =
10996 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
10998 bool target_is_thumb;
10999 Symbol_value<32> symval;
11002 // This is a global symbol. Determine if we use PLT and if the
11003 // final target is THUMB.
11004 if (gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
11006 // This uses a PLT, change the symbol value.
11007 symval.set_output_value(this->plt_section()->address()
11008 + gsym->plt_offset());
11010 target_is_thumb = false;
11012 else if (gsym->is_undefined())
11013 // There is no need to generate a stub symbol is undefined.
11018 ((gsym->type() == elfcpp::STT_ARM_TFUNC)
11019 || (gsym->type() == elfcpp::STT_FUNC
11020 && !gsym->is_undefined()
11021 && ((psymval->value(arm_relobj, 0) & 1) != 0)));
11026 // This is a local symbol. Determine if the final target is THUMB.
11027 target_is_thumb = arm_relobj->local_symbol_is_thumb_function(r_sym);
11030 // Strip LSB if this points to a THUMB target.
11031 const Arm_reloc_property* reloc_property =
11032 arm_reloc_property_table->get_implemented_static_reloc_property(r_type);
11033 gold_assert(reloc_property != NULL);
11034 if (target_is_thumb
11035 && reloc_property->uses_thumb_bit()
11036 && ((psymval->value(arm_relobj, 0) & 1) != 0))
11038 Arm_address stripped_value =
11039 psymval->value(arm_relobj, 0) & ~static_cast<Arm_address>(1);
11040 symval.set_output_value(stripped_value);
11044 // Get the symbol value.
11045 Symbol_value<32>::Value value = psymval->value(arm_relobj, 0);
11047 // Owing to pipelining, the PC relative branches below actually skip
11048 // two instructions when the branch offset is 0.
11049 Arm_address destination;
11052 case elfcpp::R_ARM_CALL:
11053 case elfcpp::R_ARM_JUMP24:
11054 case elfcpp::R_ARM_PLT32:
11056 destination = value + addend + 8;
11058 case elfcpp::R_ARM_THM_CALL:
11059 case elfcpp::R_ARM_THM_XPC22:
11060 case elfcpp::R_ARM_THM_JUMP24:
11061 case elfcpp::R_ARM_THM_JUMP19:
11063 destination = value + addend + 4;
11066 gold_unreachable();
11069 Reloc_stub* stub = NULL;
11070 Stub_type stub_type =
11071 Reloc_stub::stub_type_for_reloc(r_type, address, destination,
11073 if (stub_type != arm_stub_none)
11075 // Try looking up an existing stub from a stub table.
11076 Stub_table<big_endian>* stub_table =
11077 arm_relobj->stub_table(relinfo->data_shndx);
11078 gold_assert(stub_table != NULL);
11080 // Locate stub by destination.
11081 Reloc_stub::Key stub_key(stub_type, gsym, arm_relobj, r_sym, addend);
11083 // Create a stub if there is not one already
11084 stub = stub_table->find_reloc_stub(stub_key);
11087 // create a new stub and add it to stub table.
11088 stub = this->stub_factory().make_reloc_stub(stub_type);
11089 stub_table->add_reloc_stub(stub, stub_key);
11092 // Record the destination address.
11093 stub->set_destination_address(destination
11094 | (target_is_thumb ? 1 : 0));
11097 // For Cortex-A8, we need to record a relocation at 4K page boundary.
11098 if (this->fix_cortex_a8_
11099 && (r_type == elfcpp::R_ARM_THM_JUMP24
11100 || r_type == elfcpp::R_ARM_THM_JUMP19
11101 || r_type == elfcpp::R_ARM_THM_CALL
11102 || r_type == elfcpp::R_ARM_THM_XPC22)
11103 && (address & 0xfffU) == 0xffeU)
11105 // Found a candidate. Note we haven't checked the destination is
11106 // within 4K here: if we do so (and don't create a record) we can't
11107 // tell that a branch should have been relocated when scanning later.
11108 this->cortex_a8_relocs_info_[address] =
11109 new Cortex_a8_reloc(stub, r_type,
11110 destination | (target_is_thumb ? 1 : 0));
11114 // This function scans a relocation sections for stub generation.
11115 // The template parameter Relocate must be a class type which provides
11116 // a single function, relocate(), which implements the machine
11117 // specific part of a relocation.
11119 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
11120 // SHT_REL or SHT_RELA.
11122 // PRELOCS points to the relocation data. RELOC_COUNT is the number
11123 // of relocs. OUTPUT_SECTION is the output section.
11124 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
11125 // mapped to output offsets.
11127 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
11128 // VIEW_SIZE is the size. These refer to the input section, unless
11129 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
11130 // the output section.
11132 template<bool big_endian>
11133 template<int sh_type>
11135 Target_arm<big_endian>::scan_reloc_section_for_stubs(
11136 const Relocate_info<32, big_endian>* relinfo,
11137 const unsigned char* prelocs,
11138 size_t reloc_count,
11139 Output_section* output_section,
11140 bool needs_special_offset_handling,
11141 const unsigned char* view,
11142 elfcpp::Elf_types<32>::Elf_Addr view_address,
11145 typedef typename Reloc_types<sh_type, 32, big_endian>::Reloc Reltype;
11146 const int reloc_size =
11147 Reloc_types<sh_type, 32, big_endian>::reloc_size;
11149 Arm_relobj<big_endian>* arm_object =
11150 Arm_relobj<big_endian>::as_arm_relobj(relinfo->object);
11151 unsigned int local_count = arm_object->local_symbol_count();
11153 Comdat_behavior comdat_behavior = CB_UNDETERMINED;
11155 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
11157 Reltype reloc(prelocs);
11159 typename elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info();
11160 unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info);
11161 unsigned int r_type = elfcpp::elf_r_type<32>(r_info);
11163 r_type = this->get_real_reloc_type(r_type);
11165 // Only a few relocation types need stubs.
11166 if ((r_type != elfcpp::R_ARM_CALL)
11167 && (r_type != elfcpp::R_ARM_JUMP24)
11168 && (r_type != elfcpp::R_ARM_PLT32)
11169 && (r_type != elfcpp::R_ARM_THM_CALL)
11170 && (r_type != elfcpp::R_ARM_THM_XPC22)
11171 && (r_type != elfcpp::R_ARM_THM_JUMP24)
11172 && (r_type != elfcpp::R_ARM_THM_JUMP19)
11173 && (r_type != elfcpp::R_ARM_V4BX))
11176 section_offset_type offset =
11177 convert_to_section_size_type(reloc.get_r_offset());
11179 if (needs_special_offset_handling)
11181 offset = output_section->output_offset(relinfo->object,
11182 relinfo->data_shndx,
11188 // Create a v4bx stub if --fix-v4bx-interworking is used.
11189 if (r_type == elfcpp::R_ARM_V4BX)
11191 if (this->fix_v4bx() == General_options::FIX_V4BX_INTERWORKING)
11193 // Get the BX instruction.
11194 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
11195 const Valtype* wv =
11196 reinterpret_cast<const Valtype*>(view + offset);
11197 elfcpp::Elf_types<32>::Elf_Swxword insn =
11198 elfcpp::Swap<32, big_endian>::readval(wv);
11199 const uint32_t reg = (insn & 0xf);
11203 // Try looking up an existing stub from a stub table.
11204 Stub_table<big_endian>* stub_table =
11205 arm_object->stub_table(relinfo->data_shndx);
11206 gold_assert(stub_table != NULL);
11208 if (stub_table->find_arm_v4bx_stub(reg) == NULL)
11210 // create a new stub and add it to stub table.
11211 Arm_v4bx_stub* stub =
11212 this->stub_factory().make_arm_v4bx_stub(reg);
11213 gold_assert(stub != NULL);
11214 stub_table->add_arm_v4bx_stub(stub);
11222 Stub_addend_reader<sh_type, big_endian> stub_addend_reader;
11223 elfcpp::Elf_types<32>::Elf_Swxword addend =
11224 stub_addend_reader(r_type, view + offset, reloc);
11226 const Sized_symbol<32>* sym;
11228 Symbol_value<32> symval;
11229 const Symbol_value<32> *psymval;
11230 bool is_defined_in_discarded_section;
11231 unsigned int shndx;
11232 if (r_sym < local_count)
11235 psymval = arm_object->local_symbol(r_sym);
11237 // If the local symbol belongs to a section we are discarding,
11238 // and that section is a debug section, try to find the
11239 // corresponding kept section and map this symbol to its
11240 // counterpart in the kept section. The symbol must not
11241 // correspond to a section we are folding.
11243 shndx = psymval->input_shndx(&is_ordinary);
11244 is_defined_in_discarded_section =
11246 && shndx != elfcpp::SHN_UNDEF
11247 && !arm_object->is_section_included(shndx)
11248 && !relinfo->symtab->is_section_folded(arm_object, shndx));
11250 // We need to compute the would-be final value of this local
11252 if (!is_defined_in_discarded_section)
11254 typedef Sized_relobj_file<32, big_endian> ObjType;
11255 typename ObjType::Compute_final_local_value_status status =
11256 arm_object->compute_final_local_value(r_sym, psymval, &symval,
11258 if (status == ObjType::CFLV_OK)
11260 // Currently we cannot handle a branch to a target in
11261 // a merged section. If this is the case, issue an error
11262 // and also free the merge symbol value.
11263 if (!symval.has_output_value())
11265 const std::string& section_name =
11266 arm_object->section_name(shndx);
11267 arm_object->error(_("cannot handle branch to local %u "
11268 "in a merged section %s"),
11269 r_sym, section_name.c_str());
11275 // We cannot determine the final value.
11282 const Symbol* gsym;
11283 gsym = arm_object->global_symbol(r_sym);
11284 gold_assert(gsym != NULL);
11285 if (gsym->is_forwarder())
11286 gsym = relinfo->symtab->resolve_forwards(gsym);
11288 sym = static_cast<const Sized_symbol<32>*>(gsym);
11289 if (sym->has_symtab_index() && sym->symtab_index() != -1U)
11290 symval.set_output_symtab_index(sym->symtab_index());
11292 symval.set_no_output_symtab_entry();
11294 // We need to compute the would-be final value of this global
11296 const Symbol_table* symtab = relinfo->symtab;
11297 const Sized_symbol<32>* sized_symbol =
11298 symtab->get_sized_symbol<32>(gsym);
11299 Symbol_table::Compute_final_value_status status;
11300 Arm_address value =
11301 symtab->compute_final_value<32>(sized_symbol, &status);
11303 // Skip this if the symbol has not output section.
11304 if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION)
11306 symval.set_output_value(value);
11308 if (gsym->type() == elfcpp::STT_TLS)
11309 symval.set_is_tls_symbol();
11310 else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
11311 symval.set_is_ifunc_symbol();
11314 is_defined_in_discarded_section =
11315 (gsym->is_defined_in_discarded_section()
11316 && gsym->is_undefined());
11320 Symbol_value<32> symval2;
11321 if (is_defined_in_discarded_section)
11323 if (comdat_behavior == CB_UNDETERMINED)
11325 std::string name = arm_object->section_name(relinfo->data_shndx);
11326 comdat_behavior = get_comdat_behavior(name.c_str());
11328 if (comdat_behavior == CB_PRETEND)
11330 // FIXME: This case does not work for global symbols.
11331 // We have no place to store the original section index.
11332 // Fortunately this does not matter for comdat sections,
11333 // only for sections explicitly discarded by a linker
11336 typename elfcpp::Elf_types<32>::Elf_Addr value =
11337 arm_object->map_to_kept_section(shndx, &found);
11339 symval2.set_output_value(value + psymval->input_value());
11341 symval2.set_output_value(0);
11345 if (comdat_behavior == CB_WARNING)
11346 gold_warning_at_location(relinfo, i, offset,
11347 _("relocation refers to discarded "
11349 symval2.set_output_value(0);
11351 symval2.set_no_output_symtab_entry();
11352 psymval = &symval2;
11355 // If symbol is a section symbol, we don't know the actual type of
11356 // destination. Give up.
11357 if (psymval->is_section_symbol())
11360 this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval,
11361 addend, view_address + offset);
11365 // Scan an input section for stub generation.
11367 template<bool big_endian>
11369 Target_arm<big_endian>::scan_section_for_stubs(
11370 const Relocate_info<32, big_endian>* relinfo,
11371 unsigned int sh_type,
11372 const unsigned char* prelocs,
11373 size_t reloc_count,
11374 Output_section* output_section,
11375 bool needs_special_offset_handling,
11376 const unsigned char* view,
11377 Arm_address view_address,
11378 section_size_type view_size)
11380 if (sh_type == elfcpp::SHT_REL)
11381 this->scan_reloc_section_for_stubs<elfcpp::SHT_REL>(
11386 needs_special_offset_handling,
11390 else if (sh_type == elfcpp::SHT_RELA)
11391 // We do not support RELA type relocations yet. This is provided for
11393 this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>(
11398 needs_special_offset_handling,
11403 gold_unreachable();
11406 // Group input sections for stub generation.
11408 // We group input sections in an output section so that the total size,
11409 // including any padding space due to alignment is smaller than GROUP_SIZE
11410 // unless the only input section in group is bigger than GROUP_SIZE already.
11411 // Then an ARM stub table is created to follow the last input section
11412 // in group. For each group an ARM stub table is created an is placed
11413 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
11414 // extend the group after the stub table.
11416 template<bool big_endian>
11418 Target_arm<big_endian>::group_sections(
11420 section_size_type group_size,
11421 bool stubs_always_after_branch,
11424 // Group input sections and insert stub table
11425 Layout::Section_list section_list;
11426 layout->get_allocated_sections(§ion_list);
11427 for (Layout::Section_list::const_iterator p = section_list.begin();
11428 p != section_list.end();
11431 Arm_output_section<big_endian>* output_section =
11432 Arm_output_section<big_endian>::as_arm_output_section(*p);
11433 output_section->group_sections(group_size, stubs_always_after_branch,
11438 // Relaxation hook. This is where we do stub generation.
11440 template<bool big_endian>
11442 Target_arm<big_endian>::do_relax(
11444 const Input_objects* input_objects,
11445 Symbol_table* symtab,
11449 // No need to generate stubs if this is a relocatable link.
11450 gold_assert(!parameters->options().relocatable());
11452 // If this is the first pass, we need to group input sections into
11454 bool done_exidx_fixup = false;
11455 typedef typename Stub_table_list::iterator Stub_table_iterator;
11458 // Determine the stub group size. The group size is the absolute
11459 // value of the parameter --stub-group-size. If --stub-group-size
11460 // is passed a negative value, we restrict stubs to be always after
11461 // the stubbed branches.
11462 int32_t stub_group_size_param =
11463 parameters->options().stub_group_size();
11464 bool stubs_always_after_branch = stub_group_size_param < 0;
11465 section_size_type stub_group_size = abs(stub_group_size_param);
11467 if (stub_group_size == 1)
11470 // Thumb branch range is +-4MB has to be used as the default
11471 // maximum size (a given section can contain both ARM and Thumb
11472 // code, so the worst case has to be taken into account). If we are
11473 // fixing cortex-a8 errata, the branch range has to be even smaller,
11474 // since wide conditional branch has a range of +-1MB only.
11476 // This value is 48K less than that, which allows for 4096
11477 // 12-byte stubs. If we exceed that, then we will fail to link.
11478 // The user will have to relink with an explicit group size
11480 stub_group_size = 4145152;
11483 // The Cortex-A8 erratum fix depends on stubs not being in the same 4K
11484 // page as the first half of a 32-bit branch straddling two 4K pages.
11485 // This is a crude way of enforcing that. In addition, long conditional
11486 // branches of THUMB-2 have a range of +-1M. If we are fixing cortex-A8
11487 // erratum, limit the group size to (1M - 12k) to avoid unreachable
11488 // cortex-A8 stubs from long conditional branches.
11489 if (this->fix_cortex_a8_)
11491 stubs_always_after_branch = true;
11492 const section_size_type cortex_a8_group_size = 1024 * (1024 - 12);
11493 stub_group_size = std::max(stub_group_size, cortex_a8_group_size);
11496 group_sections(layout, stub_group_size, stubs_always_after_branch, task);
11498 // Also fix .ARM.exidx section coverage.
11499 Arm_output_section<big_endian>* exidx_output_section = NULL;
11500 for (Layout::Section_list::const_iterator p =
11501 layout->section_list().begin();
11502 p != layout->section_list().end();
11504 if ((*p)->type() == elfcpp::SHT_ARM_EXIDX)
11506 if (exidx_output_section == NULL)
11507 exidx_output_section =
11508 Arm_output_section<big_endian>::as_arm_output_section(*p);
11510 // We cannot handle this now.
11511 gold_error(_("multiple SHT_ARM_EXIDX sections %s and %s in a "
11512 "non-relocatable link"),
11513 exidx_output_section->name(),
11517 if (exidx_output_section != NULL)
11519 this->fix_exidx_coverage(layout, input_objects, exidx_output_section,
11521 done_exidx_fixup = true;
11526 // If this is not the first pass, addresses and file offsets have
11527 // been reset at this point, set them here.
11528 for (Stub_table_iterator sp = this->stub_tables_.begin();
11529 sp != this->stub_tables_.end();
11532 Arm_input_section<big_endian>* owner = (*sp)->owner();
11533 off_t off = align_address(owner->original_size(),
11534 (*sp)->addralign());
11535 (*sp)->set_address_and_file_offset(owner->address() + off,
11536 owner->offset() + off);
11540 // The Cortex-A8 stubs are sensitive to layout of code sections. At the
11541 // beginning of each relaxation pass, just blow away all the stubs.
11542 // Alternatively, we could selectively remove only the stubs and reloc
11543 // information for code sections that have moved since the last pass.
11544 // That would require more book-keeping.
11545 if (this->fix_cortex_a8_)
11547 // Clear all Cortex-A8 reloc information.
11548 for (typename Cortex_a8_relocs_info::const_iterator p =
11549 this->cortex_a8_relocs_info_.begin();
11550 p != this->cortex_a8_relocs_info_.end();
11553 this->cortex_a8_relocs_info_.clear();
11555 // Remove all Cortex-A8 stubs.
11556 for (Stub_table_iterator sp = this->stub_tables_.begin();
11557 sp != this->stub_tables_.end();
11559 (*sp)->remove_all_cortex_a8_stubs();
11562 // Scan relocs for relocation stubs
11563 for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
11564 op != input_objects->relobj_end();
11567 Arm_relobj<big_endian>* arm_relobj =
11568 Arm_relobj<big_endian>::as_arm_relobj(*op);
11569 // Lock the object so we can read from it. This is only called
11570 // single-threaded from Layout::finalize, so it is OK to lock.
11571 Task_lock_obj<Object> tl(task, arm_relobj);
11572 arm_relobj->scan_sections_for_stubs(this, symtab, layout);
11575 // Check all stub tables to see if any of them have their data sizes
11576 // or addresses alignments changed. These are the only things that
11578 bool any_stub_table_changed = false;
11579 Unordered_set<const Output_section*> sections_needing_adjustment;
11580 for (Stub_table_iterator sp = this->stub_tables_.begin();
11581 (sp != this->stub_tables_.end()) && !any_stub_table_changed;
11584 if ((*sp)->update_data_size_and_addralign())
11586 // Update data size of stub table owner.
11587 Arm_input_section<big_endian>* owner = (*sp)->owner();
11588 uint64_t address = owner->address();
11589 off_t offset = owner->offset();
11590 owner->reset_address_and_file_offset();
11591 owner->set_address_and_file_offset(address, offset);
11593 sections_needing_adjustment.insert(owner->output_section());
11594 any_stub_table_changed = true;
11598 // Output_section_data::output_section() returns a const pointer but we
11599 // need to update output sections, so we record all output sections needing
11600 // update above and scan the sections here to find out what sections need
11602 for (Layout::Section_list::const_iterator p = layout->section_list().begin();
11603 p != layout->section_list().end();
11606 if (sections_needing_adjustment.find(*p)
11607 != sections_needing_adjustment.end())
11608 (*p)->set_section_offsets_need_adjustment();
11611 // Stop relaxation if no EXIDX fix-up and no stub table change.
11612 bool continue_relaxation = done_exidx_fixup || any_stub_table_changed;
11614 // Finalize the stubs in the last relaxation pass.
11615 if (!continue_relaxation)
11617 for (Stub_table_iterator sp = this->stub_tables_.begin();
11618 (sp != this->stub_tables_.end()) && !any_stub_table_changed;
11620 (*sp)->finalize_stubs();
11622 // Update output local symbol counts of objects if necessary.
11623 for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
11624 op != input_objects->relobj_end();
11627 Arm_relobj<big_endian>* arm_relobj =
11628 Arm_relobj<big_endian>::as_arm_relobj(*op);
11630 // Update output local symbol counts. We need to discard local
11631 // symbols defined in parts of input sections that are discarded by
11633 if (arm_relobj->output_local_symbol_count_needs_update())
11635 // We need to lock the object's file to update it.
11636 Task_lock_obj<Object> tl(task, arm_relobj);
11637 arm_relobj->update_output_local_symbol_count();
11642 return continue_relaxation;
11645 // Relocate a stub.
11647 template<bool big_endian>
11649 Target_arm<big_endian>::relocate_stub(
11651 const Relocate_info<32, big_endian>* relinfo,
11652 Output_section* output_section,
11653 unsigned char* view,
11654 Arm_address address,
11655 section_size_type view_size)
11658 const Stub_template* stub_template = stub->stub_template();
11659 for (size_t i = 0; i < stub_template->reloc_count(); i++)
11661 size_t reloc_insn_index = stub_template->reloc_insn_index(i);
11662 const Insn_template* insn = &stub_template->insns()[reloc_insn_index];
11664 unsigned int r_type = insn->r_type();
11665 section_size_type reloc_offset = stub_template->reloc_offset(i);
11666 section_size_type reloc_size = insn->size();
11667 gold_assert(reloc_offset + reloc_size <= view_size);
11669 // This is the address of the stub destination.
11670 Arm_address target = stub->reloc_target(i) + insn->reloc_addend();
11671 Symbol_value<32> symval;
11672 symval.set_output_value(target);
11674 // Synthesize a fake reloc just in case. We don't have a symbol so
11676 unsigned char reloc_buffer[elfcpp::Elf_sizes<32>::rel_size];
11677 memset(reloc_buffer, 0, sizeof(reloc_buffer));
11678 elfcpp::Rel_write<32, big_endian> reloc_write(reloc_buffer);
11679 reloc_write.put_r_offset(reloc_offset);
11680 reloc_write.put_r_info(elfcpp::elf_r_info<32>(0, r_type));
11681 elfcpp::Rel<32, big_endian> rel(reloc_buffer);
11683 relocate.relocate(relinfo, this, output_section,
11684 this->fake_relnum_for_stubs, rel, r_type,
11685 NULL, &symval, view + reloc_offset,
11686 address + reloc_offset, reloc_size);
11690 // Determine whether an object attribute tag takes an integer, a
11693 template<bool big_endian>
11695 Target_arm<big_endian>::do_attribute_arg_type(int tag) const
11697 if (tag == Object_attribute::Tag_compatibility)
11698 return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL
11699 | Object_attribute::ATTR_TYPE_FLAG_STR_VAL);
11700 else if (tag == elfcpp::Tag_nodefaults)
11701 return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL
11702 | Object_attribute::ATTR_TYPE_FLAG_NO_DEFAULT);
11703 else if (tag == elfcpp::Tag_CPU_raw_name || tag == elfcpp::Tag_CPU_name)
11704 return Object_attribute::ATTR_TYPE_FLAG_STR_VAL;
11706 return Object_attribute::ATTR_TYPE_FLAG_INT_VAL;
11708 return ((tag & 1) != 0
11709 ? Object_attribute::ATTR_TYPE_FLAG_STR_VAL
11710 : Object_attribute::ATTR_TYPE_FLAG_INT_VAL);
11713 // Reorder attributes.
11715 // The ABI defines that Tag_conformance should be emitted first, and that
11716 // Tag_nodefaults should be second (if either is defined). This sets those
11717 // two positions, and bumps up the position of all the remaining tags to
11720 template<bool big_endian>
11722 Target_arm<big_endian>::do_attributes_order(int num) const
11724 // Reorder the known object attributes in output. We want to move
11725 // Tag_conformance to position 4 and Tag_conformance to position 5
11726 // and shift everything between 4 .. Tag_conformance - 1 to make room.
11728 return elfcpp::Tag_conformance;
11730 return elfcpp::Tag_nodefaults;
11731 if ((num - 2) < elfcpp::Tag_nodefaults)
11733 if ((num - 1) < elfcpp::Tag_conformance)
11738 // Scan a span of THUMB code for Cortex-A8 erratum.
11740 template<bool big_endian>
11742 Target_arm<big_endian>::scan_span_for_cortex_a8_erratum(
11743 Arm_relobj<big_endian>* arm_relobj,
11744 unsigned int shndx,
11745 section_size_type span_start,
11746 section_size_type span_end,
11747 const unsigned char* view,
11748 Arm_address address)
11750 // Scan for 32-bit Thumb-2 branches which span two 4K regions, where:
11752 // The opcode is BLX.W, BL.W, B.W, Bcc.W
11753 // The branch target is in the same 4KB region as the
11754 // first half of the branch.
11755 // The instruction before the branch is a 32-bit
11756 // length non-branch instruction.
11757 section_size_type i = span_start;
11758 bool last_was_32bit = false;
11759 bool last_was_branch = false;
11760 while (i < span_end)
11762 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
11763 const Valtype* wv = reinterpret_cast<const Valtype*>(view + i);
11764 uint32_t insn = elfcpp::Swap<16, big_endian>::readval(wv);
11765 bool is_blx = false, is_b = false;
11766 bool is_bl = false, is_bcc = false;
11768 bool insn_32bit = (insn & 0xe000) == 0xe000 && (insn & 0x1800) != 0x0000;
11771 // Load the rest of the insn (in manual-friendly order).
11772 insn = (insn << 16) | elfcpp::Swap<16, big_endian>::readval(wv + 1);
11774 // Encoding T4: B<c>.W.
11775 is_b = (insn & 0xf800d000U) == 0xf0009000U;
11776 // Encoding T1: BL<c>.W.
11777 is_bl = (insn & 0xf800d000U) == 0xf000d000U;
11778 // Encoding T2: BLX<c>.W.
11779 is_blx = (insn & 0xf800d000U) == 0xf000c000U;
11780 // Encoding T3: B<c>.W (not permitted in IT block).
11781 is_bcc = ((insn & 0xf800d000U) == 0xf0008000U
11782 && (insn & 0x07f00000U) != 0x03800000U);
11785 bool is_32bit_branch = is_b || is_bl || is_blx || is_bcc;
11787 // If this instruction is a 32-bit THUMB branch that crosses a 4K
11788 // page boundary and it follows 32-bit non-branch instruction,
11789 // we need to work around.
11790 if (is_32bit_branch
11791 && ((address + i) & 0xfffU) == 0xffeU
11793 && !last_was_branch)
11795 // Check to see if there is a relocation stub for this branch.
11796 bool force_target_arm = false;
11797 bool force_target_thumb = false;
11798 const Cortex_a8_reloc* cortex_a8_reloc = NULL;
11799 Cortex_a8_relocs_info::const_iterator p =
11800 this->cortex_a8_relocs_info_.find(address + i);
11802 if (p != this->cortex_a8_relocs_info_.end())
11804 cortex_a8_reloc = p->second;
11805 bool target_is_thumb = (cortex_a8_reloc->destination() & 1) != 0;
11807 if (cortex_a8_reloc->r_type() == elfcpp::R_ARM_THM_CALL
11808 && !target_is_thumb)
11809 force_target_arm = true;
11810 else if (cortex_a8_reloc->r_type() == elfcpp::R_ARM_THM_CALL
11811 && target_is_thumb)
11812 force_target_thumb = true;
11816 Stub_type stub_type = arm_stub_none;
11818 // Check if we have an offending branch instruction.
11819 uint16_t upper_insn = (insn >> 16) & 0xffffU;
11820 uint16_t lower_insn = insn & 0xffffU;
11821 typedef class Arm_relocate_functions<big_endian> RelocFuncs;
11823 if (cortex_a8_reloc != NULL
11824 && cortex_a8_reloc->reloc_stub() != NULL)
11825 // We've already made a stub for this instruction, e.g.
11826 // it's a long branch or a Thumb->ARM stub. Assume that
11827 // stub will suffice to work around the A8 erratum (see
11828 // setting of always_after_branch above).
11832 offset = RelocFuncs::thumb32_cond_branch_offset(upper_insn,
11834 stub_type = arm_stub_a8_veneer_b_cond;
11836 else if (is_b || is_bl || is_blx)
11838 offset = RelocFuncs::thumb32_branch_offset(upper_insn,
11843 stub_type = (is_blx
11844 ? arm_stub_a8_veneer_blx
11846 ? arm_stub_a8_veneer_bl
11847 : arm_stub_a8_veneer_b));
11850 if (stub_type != arm_stub_none)
11852 Arm_address pc_for_insn = address + i + 4;
11854 // The original instruction is a BL, but the target is
11855 // an ARM instruction. If we were not making a stub,
11856 // the BL would have been converted to a BLX. Use the
11857 // BLX stub instead in that case.
11858 if (this->may_use_v5t_interworking() && force_target_arm
11859 && stub_type == arm_stub_a8_veneer_bl)
11861 stub_type = arm_stub_a8_veneer_blx;
11865 // Conversely, if the original instruction was
11866 // BLX but the target is Thumb mode, use the BL stub.
11867 else if (force_target_thumb
11868 && stub_type == arm_stub_a8_veneer_blx)
11870 stub_type = arm_stub_a8_veneer_bl;
11878 // If we found a relocation, use the proper destination,
11879 // not the offset in the (unrelocated) instruction.
11880 // Note this is always done if we switched the stub type above.
11881 if (cortex_a8_reloc != NULL)
11882 offset = (off_t) (cortex_a8_reloc->destination() - pc_for_insn);
11884 Arm_address target = (pc_for_insn + offset) | (is_blx ? 0 : 1);
11886 // Add a new stub if destination address in in the same page.
11887 if (((address + i) & ~0xfffU) == (target & ~0xfffU))
11889 Cortex_a8_stub* stub =
11890 this->stub_factory_.make_cortex_a8_stub(stub_type,
11894 Stub_table<big_endian>* stub_table =
11895 arm_relobj->stub_table(shndx);
11896 gold_assert(stub_table != NULL);
11897 stub_table->add_cortex_a8_stub(address + i, stub);
11902 i += insn_32bit ? 4 : 2;
11903 last_was_32bit = insn_32bit;
11904 last_was_branch = is_32bit_branch;
11908 // Apply the Cortex-A8 workaround.
11910 template<bool big_endian>
11912 Target_arm<big_endian>::apply_cortex_a8_workaround(
11913 const Cortex_a8_stub* stub,
11914 Arm_address stub_address,
11915 unsigned char* insn_view,
11916 Arm_address insn_address)
11918 typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype;
11919 Valtype* wv = reinterpret_cast<Valtype*>(insn_view);
11920 Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv);
11921 Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1);
11922 off_t branch_offset = stub_address - (insn_address + 4);
11924 typedef class Arm_relocate_functions<big_endian> RelocFuncs;
11925 switch (stub->stub_template()->type())
11927 case arm_stub_a8_veneer_b_cond:
11928 // For a conditional branch, we re-write it to be an unconditional
11929 // branch to the stub. We use the THUMB-2 encoding here.
11930 upper_insn = 0xf000U;
11931 lower_insn = 0xb800U;
11933 case arm_stub_a8_veneer_b:
11934 case arm_stub_a8_veneer_bl:
11935 case arm_stub_a8_veneer_blx:
11936 if ((lower_insn & 0x5000U) == 0x4000U)
11937 // For a BLX instruction, make sure that the relocation is
11938 // rounded up to a word boundary. This follows the semantics of
11939 // the instruction which specifies that bit 1 of the target
11940 // address will come from bit 1 of the base address.
11941 branch_offset = (branch_offset + 2) & ~3;
11943 // Put BRANCH_OFFSET back into the insn.
11944 gold_assert(!Bits<25>::has_overflow32(branch_offset));
11945 upper_insn = RelocFuncs::thumb32_branch_upper(upper_insn, branch_offset);
11946 lower_insn = RelocFuncs::thumb32_branch_lower(lower_insn, branch_offset);
11950 gold_unreachable();
11953 // Put the relocated value back in the object file:
11954 elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn);
11955 elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn);
11958 // Target selector for ARM. Note this is never instantiated directly.
11959 // It's only used in Target_selector_arm_nacl, below.
11961 template<bool big_endian>
11962 class Target_selector_arm : public Target_selector
11965 Target_selector_arm()
11966 : Target_selector(elfcpp::EM_ARM, 32, big_endian,
11967 (big_endian ? "elf32-bigarm" : "elf32-littlearm"),
11968 (big_endian ? "armelfb" : "armelf"))
11972 do_instantiate_target()
11973 { return new Target_arm<big_endian>(); }
11976 // Fix .ARM.exidx section coverage.
11978 template<bool big_endian>
11980 Target_arm<big_endian>::fix_exidx_coverage(
11982 const Input_objects* input_objects,
11983 Arm_output_section<big_endian>* exidx_section,
11984 Symbol_table* symtab,
11987 // We need to look at all the input sections in output in ascending
11988 // order of of output address. We do that by building a sorted list
11989 // of output sections by addresses. Then we looks at the output sections
11990 // in order. The input sections in an output section are already sorted
11991 // by addresses within the output section.
11993 typedef std::set<Output_section*, output_section_address_less_than>
11994 Sorted_output_section_list;
11995 Sorted_output_section_list sorted_output_sections;
11997 // Find out all the output sections of input sections pointed by
11998 // EXIDX input sections.
11999 for (Input_objects::Relobj_iterator p = input_objects->relobj_begin();
12000 p != input_objects->relobj_end();
12003 Arm_relobj<big_endian>* arm_relobj =
12004 Arm_relobj<big_endian>::as_arm_relobj(*p);
12005 std::vector<unsigned int> shndx_list;
12006 arm_relobj->get_exidx_shndx_list(&shndx_list);
12007 for (size_t i = 0; i < shndx_list.size(); ++i)
12009 const Arm_exidx_input_section* exidx_input_section =
12010 arm_relobj->exidx_input_section_by_shndx(shndx_list[i]);
12011 gold_assert(exidx_input_section != NULL);
12012 if (!exidx_input_section->has_errors())
12014 unsigned int text_shndx = exidx_input_section->link();
12015 Output_section* os = arm_relobj->output_section(text_shndx);
12016 if (os != NULL && (os->flags() & elfcpp::SHF_ALLOC) != 0)
12017 sorted_output_sections.insert(os);
12022 // Go over the output sections in ascending order of output addresses.
12023 typedef typename Arm_output_section<big_endian>::Text_section_list
12025 Text_section_list sorted_text_sections;
12026 for (typename Sorted_output_section_list::iterator p =
12027 sorted_output_sections.begin();
12028 p != sorted_output_sections.end();
12031 Arm_output_section<big_endian>* arm_output_section =
12032 Arm_output_section<big_endian>::as_arm_output_section(*p);
12033 arm_output_section->append_text_sections_to_list(&sorted_text_sections);
12036 exidx_section->fix_exidx_coverage(layout, sorted_text_sections, symtab,
12037 merge_exidx_entries(), task);
12040 template<bool big_endian>
12042 Target_arm<big_endian>::do_define_standard_symbols(
12043 Symbol_table* symtab,
12046 // Handle the .ARM.exidx section.
12047 Output_section* exidx_section = layout->find_output_section(".ARM.exidx");
12049 if (exidx_section != NULL)
12051 // Create __exidx_start and __exidx_end symbols.
12052 symtab->define_in_output_data("__exidx_start",
12054 Symbol_table::PREDEFINED,
12058 elfcpp::STT_NOTYPE,
12059 elfcpp::STB_GLOBAL,
12060 elfcpp::STV_HIDDEN,
12062 false, // offset_is_from_end
12063 true); // only_if_ref
12065 symtab->define_in_output_data("__exidx_end",
12067 Symbol_table::PREDEFINED,
12071 elfcpp::STT_NOTYPE,
12072 elfcpp::STB_GLOBAL,
12073 elfcpp::STV_HIDDEN,
12075 true, // offset_is_from_end
12076 true); // only_if_ref
12080 // Define __exidx_start and __exidx_end even when .ARM.exidx
12081 // section is missing to match ld's behaviour.
12082 symtab->define_as_constant("__exidx_start", NULL,
12083 Symbol_table::PREDEFINED,
12084 0, 0, elfcpp::STT_OBJECT,
12085 elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0,
12087 symtab->define_as_constant("__exidx_end", NULL,
12088 Symbol_table::PREDEFINED,
12089 0, 0, elfcpp::STT_OBJECT,
12090 elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0,
12095 // NaCl variant. It uses different PLT contents.
12097 template<bool big_endian>
12098 class Output_data_plt_arm_nacl;
12100 template<bool big_endian>
12101 class Target_arm_nacl : public Target_arm<big_endian>
12105 : Target_arm<big_endian>(&arm_nacl_info)
12109 virtual Output_data_plt_arm<big_endian>*
12110 do_make_data_plt(Layout* layout, Output_data_space* got_plt)
12111 { return new Output_data_plt_arm_nacl<big_endian>(layout, got_plt); }
12114 static const Target::Target_info arm_nacl_info;
12117 template<bool big_endian>
12118 const Target::Target_info Target_arm_nacl<big_endian>::arm_nacl_info =
12121 big_endian, // is_big_endian
12122 elfcpp::EM_ARM, // machine_code
12123 false, // has_make_symbol
12124 false, // has_resolve
12125 false, // has_code_fill
12126 true, // is_default_stack_executable
12127 false, // can_icf_inline_merge_sections
12129 "/lib/ld-nacl-arm.so.1", // dynamic_linker
12130 0x20000, // default_text_segment_address
12131 0x10000, // abi_pagesize (overridable by -z max-page-size)
12132 0x10000, // common_pagesize (overridable by -z common-page-size)
12133 true, // isolate_execinstr
12134 0x10000000, // rosegment_gap
12135 elfcpp::SHN_UNDEF, // small_common_shndx
12136 elfcpp::SHN_UNDEF, // large_common_shndx
12137 0, // small_common_section_flags
12138 0, // large_common_section_flags
12139 ".ARM.attributes", // attributes_section
12140 "aeabi" // attributes_vendor
12143 template<bool big_endian>
12144 class Output_data_plt_arm_nacl : public Output_data_plt_arm<big_endian>
12147 Output_data_plt_arm_nacl(Layout* layout, Output_data_space* got_plt)
12148 : Output_data_plt_arm<big_endian>(layout, 16, got_plt)
12152 // Return the offset of the first non-reserved PLT entry.
12153 virtual unsigned int
12154 do_first_plt_entry_offset() const
12155 { return sizeof(first_plt_entry); }
12157 // Return the size of a PLT entry.
12158 virtual unsigned int
12159 do_get_plt_entry_size() const
12160 { return sizeof(plt_entry); }
12163 do_fill_first_plt_entry(unsigned char* pov,
12164 Arm_address got_address,
12165 Arm_address plt_address);
12168 do_fill_plt_entry(unsigned char* pov,
12169 Arm_address got_address,
12170 Arm_address plt_address,
12171 unsigned int got_offset,
12172 unsigned int plt_offset);
12175 inline uint32_t arm_movw_immediate(uint32_t value)
12177 return (value & 0x00000fff) | ((value & 0x0000f000) << 4);
12180 inline uint32_t arm_movt_immediate(uint32_t value)
12182 return ((value & 0x0fff0000) >> 16) | ((value & 0xf0000000) >> 12);
12185 // Template for the first PLT entry.
12186 static const uint32_t first_plt_entry[16];
12188 // Template for subsequent PLT entries.
12189 static const uint32_t plt_entry[4];
12192 // The first entry in the PLT.
12193 template<bool big_endian>
12194 const uint32_t Output_data_plt_arm_nacl<big_endian>::first_plt_entry[16] =
12197 0xe300c000, // movw ip, #:lower16:&GOT[2]-.+8
12198 0xe340c000, // movt ip, #:upper16:&GOT[2]-.+8
12199 0xe08cc00f, // add ip, ip, pc
12200 0xe52dc008, // str ip, [sp, #-8]!
12202 0xe7dfcf1f, // bfc ip, #30, #2
12203 0xe59cc000, // ldr ip, [ip]
12204 0xe3ccc13f, // bic ip, ip, #0xc000000f
12205 0xe12fff1c, // bx ip
12211 0xe50dc004, // str ip, [sp, #-4]
12213 0xe7dfcf1f, // bfc ip, #30, #2
12214 0xe59cc000, // ldr ip, [ip]
12215 0xe3ccc13f, // bic ip, ip, #0xc000000f
12216 0xe12fff1c, // bx ip
12219 template<bool big_endian>
12221 Output_data_plt_arm_nacl<big_endian>::do_fill_first_plt_entry(
12222 unsigned char* pov,
12223 Arm_address got_address,
12224 Arm_address plt_address)
12226 // Write first PLT entry. All but first two words are constants.
12227 const size_t num_first_plt_words = (sizeof(first_plt_entry)
12228 / sizeof(first_plt_entry[0]));
12230 int32_t got_displacement = got_address + 8 - (plt_address + 16);
12232 elfcpp::Swap<32, big_endian>::writeval
12233 (pov + 0, first_plt_entry[0] | arm_movw_immediate (got_displacement));
12234 elfcpp::Swap<32, big_endian>::writeval
12235 (pov + 4, first_plt_entry[1] | arm_movt_immediate (got_displacement));
12237 for (size_t i = 2; i < num_first_plt_words; ++i)
12238 elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]);
12241 // Subsequent entries in the PLT.
12243 template<bool big_endian>
12244 const uint32_t Output_data_plt_arm_nacl<big_endian>::plt_entry[4] =
12246 0xe300c000, // movw ip, #:lower16:&GOT[n]-.+8
12247 0xe340c000, // movt ip, #:upper16:&GOT[n]-.+8
12248 0xe08cc00f, // add ip, ip, pc
12249 0xea000000, // b .Lplt_tail
12252 template<bool big_endian>
12254 Output_data_plt_arm_nacl<big_endian>::do_fill_plt_entry(
12255 unsigned char* pov,
12256 Arm_address got_address,
12257 Arm_address plt_address,
12258 unsigned int got_offset,
12259 unsigned int plt_offset)
12261 // Calculate the displacement between the PLT slot and the
12262 // common tail that's part of the special initial PLT slot.
12263 int32_t tail_displacement = (plt_address + (11 * sizeof(uint32_t))
12264 - (plt_address + plt_offset
12265 + sizeof(plt_entry) + sizeof(uint32_t)));
12266 gold_assert((tail_displacement & 3) == 0);
12267 tail_displacement >>= 2;
12269 gold_assert ((tail_displacement & 0xff000000) == 0
12270 || (-tail_displacement & 0xff000000) == 0);
12272 // Calculate the displacement between the PLT slot and the entry
12273 // in the GOT. The offset accounts for the value produced by
12274 // adding to pc in the penultimate instruction of the PLT stub.
12275 const int32_t got_displacement = (got_address + got_offset
12276 - (plt_address + sizeof(plt_entry)));
12278 elfcpp::Swap<32, big_endian>::writeval
12279 (pov + 0, plt_entry[0] | arm_movw_immediate (got_displacement));
12280 elfcpp::Swap<32, big_endian>::writeval
12281 (pov + 4, plt_entry[1] | arm_movt_immediate (got_displacement));
12282 elfcpp::Swap<32, big_endian>::writeval
12283 (pov + 8, plt_entry[2]);
12284 elfcpp::Swap<32, big_endian>::writeval
12285 (pov + 12, plt_entry[3] | (tail_displacement & 0x00ffffff));
12288 // Target selectors.
12290 template<bool big_endian>
12291 class Target_selector_arm_nacl
12292 : public Target_selector_nacl<Target_selector_arm<big_endian>,
12293 Target_arm_nacl<big_endian> >
12296 Target_selector_arm_nacl()
12297 : Target_selector_nacl<Target_selector_arm<big_endian>,
12298 Target_arm_nacl<big_endian> >(
12300 big_endian ? "elf32-bigarm-nacl" : "elf32-littlearm-nacl",
12301 big_endian ? "armelfb_nacl" : "armelf_nacl")
12305 Target_selector_arm_nacl<false> target_selector_arm;
12306 Target_selector_arm_nacl<true> target_selector_armbe;
12308 } // End anonymous namespace.