1 // aarch64.cc -- aarch64 target support for gold.
3 // Copyright (C) 2014-2015 Free Software Foundation, Inc.
4 // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
31 #include "parameters.h"
38 #include "copy-relocs.h"
40 #include "target-reloc.h"
41 #include "target-select.h"
47 #include "aarch64-reloc-property.h"
49 // The first three .got.plt entries are reserved.
50 const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3;
58 template<int size, bool big_endian>
59 class Output_data_plt_aarch64;
61 template<int size, bool big_endian>
62 class Output_data_plt_aarch64_standard;
64 template<int size, bool big_endian>
67 template<int size, bool big_endian>
68 class AArch64_relocate_functions;
70 // Utility class dealing with insns. This is ported from macros in
71 // bfd/elfnn-aarch64.cc, but wrapped inside a class as static members. This
72 // class is used in erratum sequence scanning.
74 template<bool big_endian>
75 class AArch64_insn_utilities
78 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
80 static const int BYTES_PER_INSN;
82 // Zero register encoding - 31.
83 static const unsigned int AARCH64_ZR;
86 aarch64_bit(Insntype insn, int pos)
87 { return ((1 << pos) & insn) >> pos; }
90 aarch64_bits(Insntype insn, int pos, int l)
91 { return (insn >> pos) & ((1 << l) - 1); }
93 // Get the encoding field "op31" of 3-source data processing insns. "op31" is
94 // the name defined in armv8 insn manual C3.5.9.
96 aarch64_op31(Insntype insn)
97 { return aarch64_bits(insn, 21, 3); }
99 // Get the encoding field "ra" of 3-source data processing insns. "ra" is the
100 // third source register. See armv8 insn manual C3.5.9.
102 aarch64_ra(Insntype insn)
103 { return aarch64_bits(insn, 10, 5); }
106 is_adr(const Insntype insn)
107 { return (insn & 0x9F000000) == 0x10000000; }
110 is_adrp(const Insntype insn)
111 { return (insn & 0x9F000000) == 0x90000000; }
114 aarch64_rm(const Insntype insn)
115 { return aarch64_bits(insn, 16, 5); }
118 aarch64_rn(const Insntype insn)
119 { return aarch64_bits(insn, 5, 5); }
122 aarch64_rd(const Insntype insn)
123 { return aarch64_bits(insn, 0, 5); }
126 aarch64_rt(const Insntype insn)
127 { return aarch64_bits(insn, 0, 5); }
130 aarch64_rt2(const Insntype insn)
131 { return aarch64_bits(insn, 10, 5); }
133 // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M).
135 aarch64_adr_encode_imm(Insntype adr, int imm21)
137 gold_assert(is_adr(adr));
138 gold_assert(-(1 << 20) <= imm21 && imm21 < (1 << 20));
139 const int mask19 = (1 << 19) - 1;
141 adr &= ~((mask19 << 5) | (mask2 << 29));
142 adr |= ((imm21 & mask2) << 29) | (((imm21 >> 2) & mask19) << 5);
146 // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by
147 // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and
148 // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0.
150 aarch64_adrp_decode_imm(const Insntype adrp)
152 const int mask19 = (1 << 19) - 1;
154 gold_assert(is_adrp(adrp));
155 // 21-bit imm encoded in adrp.
156 uint64_t imm = ((adrp >> 29) & mask2) | (((adrp >> 5) & mask19) << 2);
157 // Retrieve msb of 21-bit-signed imm for sign extension.
158 uint64_t msbt = (imm >> 20) & 1;
159 // Real value is imm multipled by 4k. Value now has 33-bit information.
160 int64_t value = imm << 12;
161 // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it
163 return ((((uint64_t)(1) << 32) - msbt) << 33) | value;
167 aarch64_b(const Insntype insn)
168 { return (insn & 0xFC000000) == 0x14000000; }
171 aarch64_bl(const Insntype insn)
172 { return (insn & 0xFC000000) == 0x94000000; }
175 aarch64_blr(const Insntype insn)
176 { return (insn & 0xFFFFFC1F) == 0xD63F0000; }
179 aarch64_br(const Insntype insn)
180 { return (insn & 0xFFFFFC1F) == 0xD61F0000; }
182 // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for
183 // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops.
185 aarch64_ld(Insntype insn) { return aarch64_bit(insn, 22) == 1; }
188 aarch64_ldst(Insntype insn)
189 { return (insn & 0x0a000000) == 0x08000000; }
192 aarch64_ldst_ex(Insntype insn)
193 { return (insn & 0x3f000000) == 0x08000000; }
196 aarch64_ldst_pcrel(Insntype insn)
197 { return (insn & 0x3b000000) == 0x18000000; }
200 aarch64_ldst_nap(Insntype insn)
201 { return (insn & 0x3b800000) == 0x28000000; }
204 aarch64_ldstp_pi(Insntype insn)
205 { return (insn & 0x3b800000) == 0x28800000; }
208 aarch64_ldstp_o(Insntype insn)
209 { return (insn & 0x3b800000) == 0x29000000; }
212 aarch64_ldstp_pre(Insntype insn)
213 { return (insn & 0x3b800000) == 0x29800000; }
216 aarch64_ldst_ui(Insntype insn)
217 { return (insn & 0x3b200c00) == 0x38000000; }
220 aarch64_ldst_piimm(Insntype insn)
221 { return (insn & 0x3b200c00) == 0x38000400; }
224 aarch64_ldst_u(Insntype insn)
225 { return (insn & 0x3b200c00) == 0x38000800; }
228 aarch64_ldst_preimm(Insntype insn)
229 { return (insn & 0x3b200c00) == 0x38000c00; }
232 aarch64_ldst_ro(Insntype insn)
233 { return (insn & 0x3b200c00) == 0x38200800; }
236 aarch64_ldst_uimm(Insntype insn)
237 { return (insn & 0x3b000000) == 0x39000000; }
240 aarch64_ldst_simd_m(Insntype insn)
241 { return (insn & 0xbfbf0000) == 0x0c000000; }
244 aarch64_ldst_simd_m_pi(Insntype insn)
245 { return (insn & 0xbfa00000) == 0x0c800000; }
248 aarch64_ldst_simd_s(Insntype insn)
249 { return (insn & 0xbf9f0000) == 0x0d000000; }
252 aarch64_ldst_simd_s_pi(Insntype insn)
253 { return (insn & 0xbf800000) == 0x0d800000; }
255 // Classify an INSN if it is indeed a load/store. Return true if INSN is a
256 // LD/ST instruction otherwise return false. For scalar LD/ST instructions
257 // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair
258 // instructions PAIR is TRUE, RT and RT2 are returned.
260 aarch64_mem_op_p(Insntype insn, unsigned int *rt, unsigned int *rt2,
261 bool *pair, bool *load)
269 /* Bail out quickly if INSN doesn't fall into the the load-store
271 if (!aarch64_ldst (insn))
276 if (aarch64_ldst_ex (insn))
278 *rt = aarch64_rt (insn);
280 if (aarch64_bit (insn, 21) == 1)
283 *rt2 = aarch64_rt2 (insn);
285 *load = aarch64_ld (insn);
288 else if (aarch64_ldst_nap (insn)
289 || aarch64_ldstp_pi (insn)
290 || aarch64_ldstp_o (insn)
291 || aarch64_ldstp_pre (insn))
294 *rt = aarch64_rt (insn);
295 *rt2 = aarch64_rt2 (insn);
296 *load = aarch64_ld (insn);
299 else if (aarch64_ldst_pcrel (insn)
300 || aarch64_ldst_ui (insn)
301 || aarch64_ldst_piimm (insn)
302 || aarch64_ldst_u (insn)
303 || aarch64_ldst_preimm (insn)
304 || aarch64_ldst_ro (insn)
305 || aarch64_ldst_uimm (insn))
307 *rt = aarch64_rt (insn);
309 if (aarch64_ldst_pcrel (insn))
311 opc = aarch64_bits (insn, 22, 2);
312 v = aarch64_bit (insn, 26);
313 opc_v = opc | (v << 2);
314 *load = (opc_v == 1 || opc_v == 2 || opc_v == 3
315 || opc_v == 5 || opc_v == 7);
318 else if (aarch64_ldst_simd_m (insn)
319 || aarch64_ldst_simd_m_pi (insn))
321 *rt = aarch64_rt (insn);
322 *load = aarch64_bit (insn, 22);
323 opcode = (insn >> 12) & 0xf;
350 else if (aarch64_ldst_simd_s (insn)
351 || aarch64_ldst_simd_s_pi (insn))
353 *rt = aarch64_rt (insn);
354 r = (insn >> 21) & 1;
355 *load = aarch64_bit (insn, 22);
356 opcode = (insn >> 13) & 0x7;
368 *rt2 = *rt + (r == 0 ? 2 : 3);
376 *rt2 = *rt + (r == 0 ? 2 : 3);
385 } // End of "aarch64_mem_op_p".
387 // Return true if INSN is mac insn.
389 aarch64_mac(Insntype insn)
390 { return (insn & 0xff000000) == 0x9b000000; }
392 // Return true if INSN is multiply-accumulate.
393 // (This is similar to implementaton in elfnn-aarch64.c.)
395 aarch64_mlxl(Insntype insn)
397 uint32_t op31 = aarch64_op31(insn);
398 if (aarch64_mac(insn)
399 && (op31 == 0 || op31 == 1 || op31 == 5)
400 /* Exclude MUL instructions which are encoded as a multiple-accumulate
402 && aarch64_ra(insn) != AARCH64_ZR)
408 }; // End of "AArch64_insn_utilities".
411 // Insn length in byte.
413 template<bool big_endian>
414 const int AArch64_insn_utilities<big_endian>::BYTES_PER_INSN = 4;
417 // Zero register encoding - 31.
419 template<bool big_endian>
420 const unsigned int AArch64_insn_utilities<big_endian>::AARCH64_ZR = 0x1f;
423 // Output_data_got_aarch64 class.
425 template<int size, bool big_endian>
426 class Output_data_got_aarch64 : public Output_data_got<size, big_endian>
429 typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
430 Output_data_got_aarch64(Symbol_table* symtab, Layout* layout)
431 : Output_data_got<size, big_endian>(),
432 symbol_table_(symtab), layout_(layout)
435 // Add a static entry for the GOT entry at OFFSET. GSYM is a global
436 // symbol and R_TYPE is the code of a dynamic relocation that needs to be
437 // applied in a static link.
439 add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
440 { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); }
443 // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object
444 // defining a local symbol with INDEX. R_TYPE is the code of a dynamic
445 // relocation that needs to be applied in a static link.
447 add_static_reloc(unsigned int got_offset, unsigned int r_type,
448 Sized_relobj_file<size, big_endian>* relobj,
451 this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj,
457 // Write out the GOT table.
459 do_write(Output_file* of) {
460 // The first entry in the GOT is the address of the .dynamic section.
461 gold_assert(this->data_size() >= size / 8);
462 Output_section* dynamic = this->layout_->dynamic_section();
463 Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
464 this->replace_constant(0, dynamic_addr);
465 Output_data_got<size, big_endian>::do_write(of);
467 // Handling static relocs
468 if (this->static_relocs_.empty())
471 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
473 gold_assert(parameters->doing_static_link());
474 const off_t offset = this->offset();
475 const section_size_type oview_size =
476 convert_to_section_size_type(this->data_size());
477 unsigned char* const oview = of->get_output_view(offset, oview_size);
479 Output_segment* tls_segment = this->layout_->tls_segment();
480 gold_assert(tls_segment != NULL);
482 AArch64_address aligned_tcb_address =
483 align_address(Target_aarch64<size, big_endian>::TCB_SIZE,
484 tls_segment->maximum_alignment());
486 for (size_t i = 0; i < this->static_relocs_.size(); ++i)
488 Static_reloc& reloc(this->static_relocs_[i]);
489 AArch64_address value;
491 if (!reloc.symbol_is_global())
493 Sized_relobj_file<size, big_endian>* object = reloc.relobj();
494 const Symbol_value<size>* psymval =
495 reloc.relobj()->local_symbol(reloc.index());
497 // We are doing static linking. Issue an error and skip this
498 // relocation if the symbol is undefined or in a discarded_section.
500 unsigned int shndx = psymval->input_shndx(&is_ordinary);
501 if ((shndx == elfcpp::SHN_UNDEF)
503 && shndx != elfcpp::SHN_UNDEF
504 && !object->is_section_included(shndx)
505 && !this->symbol_table_->is_section_folded(object, shndx)))
507 gold_error(_("undefined or discarded local symbol %u from "
508 " object %s in GOT"),
509 reloc.index(), reloc.relobj()->name().c_str());
512 value = psymval->value(object, 0);
516 const Symbol* gsym = reloc.symbol();
517 gold_assert(gsym != NULL);
518 if (gsym->is_forwarder())
519 gsym = this->symbol_table_->resolve_forwards(gsym);
521 // We are doing static linking. Issue an error and skip this
522 // relocation if the symbol is undefined or in a discarded_section
523 // unless it is a weakly_undefined symbol.
524 if ((gsym->is_defined_in_discarded_section()
525 || gsym->is_undefined())
526 && !gsym->is_weak_undefined())
528 gold_error(_("undefined or discarded symbol %s in GOT"),
533 if (!gsym->is_weak_undefined())
535 const Sized_symbol<size>* sym =
536 static_cast<const Sized_symbol<size>*>(gsym);
537 value = sym->value();
543 unsigned got_offset = reloc.got_offset();
544 gold_assert(got_offset < oview_size);
546 typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype;
547 Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset);
549 switch (reloc.r_type())
551 case elfcpp::R_AARCH64_TLS_DTPREL64:
554 case elfcpp::R_AARCH64_TLS_TPREL64:
555 x = value + aligned_tcb_address;
560 elfcpp::Swap<size, big_endian>::writeval(wv, x);
563 of->write_output_view(offset, oview_size, oview);
567 // Symbol table of the output object.
568 Symbol_table* symbol_table_;
569 // A pointer to the Layout class, so that we can find the .dynamic
570 // section when we write out the GOT section.
573 // This class represent dynamic relocations that need to be applied by
574 // gold because we are using TLS relocations in a static link.
578 Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
579 : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true)
580 { this->u_.global.symbol = gsym; }
582 Static_reloc(unsigned int got_offset, unsigned int r_type,
583 Sized_relobj_file<size, big_endian>* relobj, unsigned int index)
584 : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false)
586 this->u_.local.relobj = relobj;
587 this->u_.local.index = index;
590 // Return the GOT offset.
593 { return this->got_offset_; }
598 { return this->r_type_; }
600 // Whether the symbol is global or not.
602 symbol_is_global() const
603 { return this->symbol_is_global_; }
605 // For a relocation against a global symbol, the global symbol.
609 gold_assert(this->symbol_is_global_);
610 return this->u_.global.symbol;
613 // For a relocation against a local symbol, the defining object.
614 Sized_relobj_file<size, big_endian>*
617 gold_assert(!this->symbol_is_global_);
618 return this->u_.local.relobj;
621 // For a relocation against a local symbol, the local symbol index.
625 gold_assert(!this->symbol_is_global_);
626 return this->u_.local.index;
630 // GOT offset of the entry to which this relocation is applied.
631 unsigned int got_offset_;
632 // Type of relocation.
633 unsigned int r_type_;
634 // Whether this relocation is against a global symbol.
635 bool symbol_is_global_;
636 // A global or local symbol.
641 // For a global symbol, the symbol itself.
646 // For a local symbol, the object defining the symbol.
647 Sized_relobj_file<size, big_endian>* relobj;
648 // For a local symbol, the symbol index.
652 }; // End of inner class Static_reloc
654 std::vector<Static_reloc> static_relocs_;
655 }; // End of Output_data_got_aarch64
658 template<int size, bool big_endian>
659 class AArch64_input_section;
662 template<int size, bool big_endian>
663 class AArch64_output_section;
666 template<int size, bool big_endian>
667 class AArch64_relobj;
670 // Stub type enum constants.
676 // Using adrp/add pair, 4 insns (including alignment) without mem access,
677 // the fastest stub. This has a limited jump distance, which is tested by
678 // aarch64_valid_for_adrp_p.
681 // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
682 // unlimited in jump distance.
683 ST_LONG_BRANCH_ABS = 2,
685 // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1
686 // mem access, slowest one. Only used in position independent executables.
687 ST_LONG_BRANCH_PCREL = 3,
689 // Stub for erratum 843419 handling.
692 // Stub for erratum 835769 handling.
695 // Number of total stub types.
700 // Struct that wraps insns for a particular stub. All stub templates are
701 // created/initialized as constants by Stub_template_repertoire.
703 template<bool big_endian>
706 const typename AArch64_insn_utilities<big_endian>::Insntype* insns;
711 // Simple singleton class that creates/initializes/stores all types of stub
714 template<bool big_endian>
715 class Stub_template_repertoire
718 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
720 // Single static method to get stub template for a given stub type.
721 static const Stub_template<big_endian>*
722 get_stub_template(int type)
724 static Stub_template_repertoire<big_endian> singleton;
725 return singleton.stub_templates_[type];
729 // Constructor - creates/initializes all stub templates.
730 Stub_template_repertoire();
731 ~Stub_template_repertoire()
734 // Disallowing copy ctor and copy assignment operator.
735 Stub_template_repertoire(Stub_template_repertoire&);
736 Stub_template_repertoire& operator=(Stub_template_repertoire&);
738 // Data that stores all insn templates.
739 const Stub_template<big_endian>* stub_templates_[ST_NUMBER];
740 }; // End of "class Stub_template_repertoire".
743 // Constructor - creates/initilizes all stub templates.
745 template<bool big_endian>
746 Stub_template_repertoire<big_endian>::Stub_template_repertoire()
748 // Insn array definitions.
749 const static Insntype ST_NONE_INSNS[] = {};
751 const static Insntype ST_ADRP_BRANCH_INSNS[] =
753 0x90000010, /* adrp ip0, X */
754 /* ADR_PREL_PG_HI21(X) */
755 0x91000210, /* add ip0, ip0, :lo12:X */
756 /* ADD_ABS_LO12_NC(X) */
757 0xd61f0200, /* br ip0 */
758 0x00000000, /* alignment padding */
761 const static Insntype ST_LONG_BRANCH_ABS_INSNS[] =
763 0x58000050, /* ldr ip0, 0x8 */
764 0xd61f0200, /* br ip0 */
765 0x00000000, /* address field */
766 0x00000000, /* address fields */
769 const static Insntype ST_LONG_BRANCH_PCREL_INSNS[] =
771 0x58000090, /* ldr ip0, 0x10 */
772 0x10000011, /* adr ip1, #0 */
773 0x8b110210, /* add ip0, ip0, ip1 */
774 0xd61f0200, /* br ip0 */
775 0x00000000, /* address field */
776 0x00000000, /* address field */
777 0x00000000, /* alignment padding */
778 0x00000000, /* alignment padding */
781 const static Insntype ST_E_843419_INSNS[] =
783 0x00000000, /* Placeholder for erratum insn. */
784 0x14000000, /* b <label> */
787 // ST_E_835769 has the same stub template as ST_E_843419.
788 const static Insntype* ST_E_835769_INSNS = ST_E_843419_INSNS;
790 #define install_insn_template(T) \
791 const static Stub_template<big_endian> template_##T = { \
792 T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \
793 this->stub_templates_[T] = &template_##T
795 install_insn_template(ST_NONE);
796 install_insn_template(ST_ADRP_BRANCH);
797 install_insn_template(ST_LONG_BRANCH_ABS);
798 install_insn_template(ST_LONG_BRANCH_PCREL);
799 install_insn_template(ST_E_843419);
800 install_insn_template(ST_E_835769);
802 #undef install_insn_template
806 // Base class for stubs.
808 template<int size, bool big_endian>
812 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
813 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
815 static const AArch64_address invalid_address =
816 static_cast<AArch64_address>(-1);
818 static const section_offset_type invalid_offset =
819 static_cast<section_offset_type>(-1);
822 : destination_address_(invalid_address),
823 offset_(invalid_offset),
833 { return this->type_; }
835 // Get stub template that provides stub insn information.
836 const Stub_template<big_endian>*
837 stub_template() const
839 return Stub_template_repertoire<big_endian>::
840 get_stub_template(this->type());
843 // Get destination address.
845 destination_address() const
847 gold_assert(this->destination_address_ != this->invalid_address);
848 return this->destination_address_;
851 // Set destination address.
853 set_destination_address(AArch64_address address)
855 gold_assert(address != this->invalid_address);
856 this->destination_address_ = address;
859 // Reset the destination address.
861 reset_destination_address()
862 { this->destination_address_ = this->invalid_address; }
864 // Get offset of code stub. For Reloc_stub, it is the offset from the
865 // beginning of its containing stub table; for Erratum_stub, it is the offset
866 // from the end of reloc_stubs.
870 gold_assert(this->offset_ != this->invalid_offset);
871 return this->offset_;
876 set_offset(section_offset_type offset)
877 { this->offset_ = offset; }
879 // Return the stub insn.
882 { return this->stub_template()->insns; }
884 // Return num of stub insns.
887 { return this->stub_template()->insn_num; }
889 // Get size of the stub.
893 return this->insn_num() *
894 AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
897 // Write stub to output file.
899 write(unsigned char* view, section_size_type view_size)
900 { this->do_write(view, view_size); }
903 // Abstract method to be implemented by sub-classes.
905 do_write(unsigned char*, section_size_type) = 0;
908 // The last insn of a stub is a jump to destination insn. This field records
909 // the destination address.
910 AArch64_address destination_address_;
911 // The stub offset. Note this has difference interpretations between an
912 // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the
913 // beginning of the containing stub_table, whereas for Erratum_stub, this is
914 // the offset from the end of reloc_stubs.
915 section_offset_type offset_;
918 }; // End of "Stub_base".
921 // Erratum stub class. An erratum stub differs from a reloc stub in that for
922 // each erratum occurrence, we generate an erratum stub. We never share erratum
923 // stubs, whereas for reloc stubs, different branches insns share a single reloc
924 // stub as long as the branch targets are the same. (More to the point, reloc
925 // stubs can be shared because they're used to reach a specific target, whereas
926 // erratum stubs branch back to the original control flow.)
928 template<int size, bool big_endian>
929 class Erratum_stub : public Stub_base<size, big_endian>
932 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
933 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
934 typedef AArch64_insn_utilities<big_endian> Insn_utilities;
935 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
937 static const int STUB_ADDR_ALIGN;
939 static const Insntype invalid_insn = static_cast<Insntype>(-1);
941 Erratum_stub(The_aarch64_relobj* relobj, int type,
942 unsigned shndx, unsigned int sh_offset)
943 : Stub_base<size, big_endian>(type), relobj_(relobj),
944 shndx_(shndx), sh_offset_(sh_offset),
945 erratum_insn_(invalid_insn),
946 erratum_address_(this->invalid_address)
951 // Return the object that contains the erratum.
954 { return this->relobj_; }
956 // Get section index of the erratum.
959 { return this->shndx_; }
961 // Get section offset of the erratum.
964 { return this->sh_offset_; }
966 // Get the erratum insn. This is the insn located at erratum_insn_address.
970 gold_assert(this->erratum_insn_ != this->invalid_insn);
971 return this->erratum_insn_;
974 // Set the insn that the erratum happens to.
976 set_erratum_insn(Insntype insn)
977 { this->erratum_insn_ = insn; }
979 // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a
980 // relocation spot, in this case, the erratum_insn_ recorded at scanning phase
981 // is no longer the one we want to write out to the stub, update erratum_insn_
982 // with relocated version. Also note that in this case xn must not be "PC", so
983 // it is safe to move the erratum insn from the origin place to the stub. For
984 // 835769, the erratum insn is multiply-accumulate insn, which could not be a
985 // relocation spot (assertion added though).
987 update_erratum_insn(Insntype insn)
989 gold_assert(this->erratum_insn_ != this->invalid_insn);
990 switch (this->type())
993 gold_assert(Insn_utilities::aarch64_ldst_uimm(insn));
994 gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn()));
995 gold_assert(Insn_utilities::aarch64_rd(insn) ==
996 Insn_utilities::aarch64_rd(this->erratum_insn()));
997 gold_assert(Insn_utilities::aarch64_rn(insn) ==
998 Insn_utilities::aarch64_rn(this->erratum_insn()));
999 // Update plain ld/st insn with relocated insn.
1000 this->erratum_insn_ = insn;
1003 gold_assert(insn == this->erratum_insn());
1011 // Return the address where an erratum must be done.
1013 erratum_address() const
1015 gold_assert(this->erratum_address_ != this->invalid_address);
1016 return this->erratum_address_;
1019 // Set the address where an erratum must be done.
1021 set_erratum_address(AArch64_address addr)
1022 { this->erratum_address_ = addr; }
1024 // Comparator used to group Erratum_stubs in a set by (obj, shndx,
1025 // sh_offset). We do not include 'type' in the calculation, becuase there is
1026 // at most one stub type at (obj, shndx, sh_offset).
1028 operator<(const Erratum_stub<size, big_endian>& k) const
1032 // We group stubs by relobj.
1033 if (this->relobj_ != k.relobj_)
1034 return this->relobj_ < k.relobj_;
1035 // Then by section index.
1036 if (this->shndx_ != k.shndx_)
1037 return this->shndx_ < k.shndx_;
1038 // Lastly by section offset.
1039 return this->sh_offset_ < k.sh_offset_;
1044 do_write(unsigned char*, section_size_type);
1047 // The object that needs to be fixed.
1048 The_aarch64_relobj* relobj_;
1049 // The shndx in the object that needs to be fixed.
1050 const unsigned int shndx_;
1051 // The section offset in the obejct that needs to be fixed.
1052 const unsigned int sh_offset_;
1053 // The insn to be fixed.
1054 Insntype erratum_insn_;
1055 // The address of the above insn.
1056 AArch64_address erratum_address_;
1057 }; // End of "Erratum_stub".
1060 // Erratum sub class to wrap additional info needed by 843419. In fixing this
1061 // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need
1062 // adrp's code position (two or three insns before erratum insn itself).
1064 template<int size, bool big_endian>
1065 class E843419_stub : public Erratum_stub<size, big_endian>
1068 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
1070 E843419_stub(AArch64_relobj<size, big_endian>* relobj,
1071 unsigned int shndx, unsigned int sh_offset,
1072 unsigned int adrp_sh_offset)
1073 : Erratum_stub<size, big_endian>(relobj, ST_E_843419, shndx, sh_offset),
1074 adrp_sh_offset_(adrp_sh_offset)
1078 adrp_sh_offset() const
1079 { return this->adrp_sh_offset_; }
1082 // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we
1083 // can can obtain it from its parent.)
1084 const unsigned int adrp_sh_offset_;
1088 template<int size, bool big_endian>
1089 const int Erratum_stub<size, big_endian>::STUB_ADDR_ALIGN = 4;
1091 // Comparator used in set definition.
1092 template<int size, bool big_endian>
1093 struct Erratum_stub_less
1096 operator()(const Erratum_stub<size, big_endian>* s1,
1097 const Erratum_stub<size, big_endian>* s2) const
1098 { return *s1 < *s2; }
1101 // Erratum_stub implementation for writing stub to output file.
1103 template<int size, bool big_endian>
1105 Erratum_stub<size, big_endian>::do_write(unsigned char* view, section_size_type)
1107 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
1108 const Insntype* insns = this->insns();
1109 uint32_t num_insns = this->insn_num();
1110 Insntype* ip = reinterpret_cast<Insntype*>(view);
1111 // For current implemented erratum 843419 and 835769, the first insn in the
1112 // stub is always a copy of the problematic insn (in 843419, the mem access
1113 // insn, in 835769, the mac insn), followed by a jump-back.
1114 elfcpp::Swap<32, big_endian>::writeval(ip, this->erratum_insn());
1115 for (uint32_t i = 1; i < num_insns; ++i)
1116 elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
1120 // Reloc stub class.
1122 template<int size, bool big_endian>
1123 class Reloc_stub : public Stub_base<size, big_endian>
1126 typedef Reloc_stub<size, big_endian> This;
1127 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
1129 // Branch range. This is used to calculate the section group size, as well as
1130 // determine whether a stub is needed.
1131 static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2;
1132 static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2);
1134 // Constant used to determine if an offset fits in the adrp instruction
1136 static const int MAX_ADRP_IMM = (1 << 20) - 1;
1137 static const int MIN_ADRP_IMM = -(1 << 20);
1139 static const int BYTES_PER_INSN = 4;
1140 static const int STUB_ADDR_ALIGN;
1142 // Determine whether the offset fits in the jump/branch instruction.
1144 aarch64_valid_branch_offset_p(int64_t offset)
1145 { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; }
1147 // Determine whether the offset fits in the adrp immediate field.
1149 aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest)
1151 typedef AArch64_relocate_functions<size, big_endian> Reloc;
1152 int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12;
1153 return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM;
1156 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1159 stub_type_for_reloc(unsigned int r_type, AArch64_address address,
1160 AArch64_address target);
1162 Reloc_stub(int type)
1163 : Stub_base<size, big_endian>(type)
1169 // The key class used to index the stub instance in the stub table's stub map.
1173 Key(int type, const Symbol* symbol, const Relobj* relobj,
1174 unsigned int r_sym, int32_t addend)
1175 : type_(type), addend_(addend)
1179 this->r_sym_ = Reloc_stub::invalid_index;
1180 this->u_.symbol = symbol;
1184 gold_assert(relobj != NULL && r_sym != invalid_index);
1185 this->r_sym_ = r_sym;
1186 this->u_.relobj = relobj;
1193 // Return stub type.
1196 { return this->type_; }
1198 // Return the local symbol index or invalid_index.
1201 { return this->r_sym_; }
1203 // Return the symbol if there is one.
1206 { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; }
1208 // Return the relobj if there is one.
1211 { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; }
1213 // Whether this equals to another key k.
1215 eq(const Key& k) const
1217 return ((this->type_ == k.type_)
1218 && (this->r_sym_ == k.r_sym_)
1219 && ((this->r_sym_ != Reloc_stub::invalid_index)
1220 ? (this->u_.relobj == k.u_.relobj)
1221 : (this->u_.symbol == k.u_.symbol))
1222 && (this->addend_ == k.addend_));
1225 // Return a hash value.
1229 size_t name_hash_value = gold::string_hash<char>(
1230 (this->r_sym_ != Reloc_stub::invalid_index)
1231 ? this->u_.relobj->name().c_str()
1232 : this->u_.symbol->name());
1233 // We only have 4 stub types.
1234 size_t stub_type_hash_value = 0x03 & this->type_;
1235 return (name_hash_value
1236 ^ stub_type_hash_value
1237 ^ ((this->r_sym_ & 0x3fff) << 2)
1238 ^ ((this->addend_ & 0xffff) << 16));
1241 // Functors for STL associative containers.
1245 operator()(const Key& k) const
1246 { return k.hash_value(); }
1252 operator()(const Key& k1, const Key& k2) const
1253 { return k1.eq(k2); }
1259 // If this is a local symbol, this is the index in the defining object.
1260 // Otherwise, it is invalid_index for a global symbol.
1261 unsigned int r_sym_;
1262 // If r_sym_ is an invalid index, this points to a global symbol.
1263 // Otherwise, it points to a relobj. We used the unsized and target
1264 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1265 // Arm_relobj, in order to avoid making the stub class a template
1266 // as most of the stub machinery is endianness-neutral. However, it
1267 // may require a bit of casting done by users of this class.
1270 const Symbol* symbol;
1271 const Relobj* relobj;
1273 // Addend associated with a reloc.
1275 }; // End of inner class Reloc_stub::Key
1278 // This may be overridden in the child class.
1280 do_write(unsigned char*, section_size_type);
1283 static const unsigned int invalid_index = static_cast<unsigned int>(-1);
1284 }; // End of Reloc_stub
1286 template<int size, bool big_endian>
1287 const int Reloc_stub<size, big_endian>::STUB_ADDR_ALIGN = 4;
1289 // Write data to output file.
1291 template<int size, bool big_endian>
1293 Reloc_stub<size, big_endian>::
1294 do_write(unsigned char* view, section_size_type)
1296 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
1297 const uint32_t* insns = this->insns();
1298 uint32_t num_insns = this->insn_num();
1299 Insntype* ip = reinterpret_cast<Insntype*>(view);
1300 for (uint32_t i = 0; i < num_insns; ++i)
1301 elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
1305 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1308 template<int size, bool big_endian>
1310 Reloc_stub<size, big_endian>::stub_type_for_reloc(
1311 unsigned int r_type, AArch64_address location, AArch64_address dest)
1313 int64_t branch_offset = 0;
1316 case elfcpp::R_AARCH64_CALL26:
1317 case elfcpp::R_AARCH64_JUMP26:
1318 branch_offset = dest - location;
1324 if (aarch64_valid_branch_offset_p(branch_offset))
1327 if (aarch64_valid_for_adrp_p(location, dest))
1328 return ST_ADRP_BRANCH;
1330 if (parameters->options().output_is_position_independent()
1331 && parameters->options().output_is_executable())
1332 return ST_LONG_BRANCH_PCREL;
1334 return ST_LONG_BRANCH_ABS;
1337 // A class to hold stubs for the ARM target.
1339 template<int size, bool big_endian>
1340 class Stub_table : public Output_data
1343 typedef Target_aarch64<size, big_endian> The_target_aarch64;
1344 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
1345 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
1346 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
1347 typedef Reloc_stub<size, big_endian> The_reloc_stub;
1348 typedef typename The_reloc_stub::Key The_reloc_stub_key;
1349 typedef Erratum_stub<size, big_endian> The_erratum_stub;
1350 typedef Erratum_stub_less<size, big_endian> The_erratum_stub_less;
1351 typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash;
1352 typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to;
1353 typedef Stub_table<size, big_endian> The_stub_table;
1354 typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*,
1355 The_reloc_stub_key_hash, The_reloc_stub_key_equal_to>
1357 typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter;
1358 typedef Relocate_info<size, big_endian> The_relocate_info;
1360 typedef std::set<The_erratum_stub*, The_erratum_stub_less> Erratum_stub_set;
1361 typedef typename Erratum_stub_set::iterator Erratum_stub_set_iter;
1363 Stub_table(The_aarch64_input_section* owner)
1364 : Output_data(), owner_(owner), reloc_stubs_size_(0),
1365 erratum_stubs_size_(0), prev_data_size_(0)
1371 The_aarch64_input_section*
1375 // Whether this stub table is empty.
1378 { return reloc_stubs_.empty() && erratum_stubs_.empty(); }
1380 // Return the current data size.
1382 current_data_size() const
1383 { return this->current_data_size_for_child(); }
1385 // Add a STUB using KEY. The caller is responsible for avoiding addition
1386 // if a STUB with the same key has already been added.
1388 add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key);
1390 // Add an erratum stub into the erratum stub set. The set is ordered by
1391 // (relobj, shndx, sh_offset).
1393 add_erratum_stub(The_erratum_stub* stub);
1395 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1397 find_erratum_stub(The_aarch64_relobj* a64relobj,
1398 unsigned int shndx, unsigned int sh_offset);
1400 // Find all the erratums for a given input section. The return value is a pair
1401 // of iterators [begin, end).
1402 std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
1403 find_erratum_stubs_for_input_section(The_aarch64_relobj* a64relobj,
1404 unsigned int shndx);
1406 // Compute the erratum stub address.
1408 erratum_stub_address(The_erratum_stub* stub) const
1410 AArch64_address r = align_address(this->address() + this->reloc_stubs_size_,
1411 The_erratum_stub::STUB_ADDR_ALIGN);
1412 r += stub->offset();
1416 // Finalize stubs. No-op here, just for completeness.
1421 // Look up a relocation stub using KEY. Return NULL if there is none.
1423 find_reloc_stub(The_reloc_stub_key& key)
1425 Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key);
1426 return (p != this->reloc_stubs_.end()) ? p->second : NULL;
1429 // Relocate stubs in this stub table.
1431 relocate_stubs(const The_relocate_info*,
1432 The_target_aarch64*,
1438 // Update data size at the end of a relaxation pass. Return true if data size
1439 // is different from that of the previous relaxation pass.
1441 update_data_size_changed_p()
1443 // No addralign changed here.
1444 off_t s = align_address(this->reloc_stubs_size_,
1445 The_erratum_stub::STUB_ADDR_ALIGN)
1446 + this->erratum_stubs_size_;
1447 bool changed = (s != this->prev_data_size_);
1448 this->prev_data_size_ = s;
1453 // Write out section contents.
1455 do_write(Output_file*);
1457 // Return the required alignment.
1459 do_addralign() const
1461 return std::max(The_reloc_stub::STUB_ADDR_ALIGN,
1462 The_erratum_stub::STUB_ADDR_ALIGN);
1465 // Reset address and file offset.
1467 do_reset_address_and_file_offset()
1468 { this->set_current_data_size_for_child(this->prev_data_size_); }
1470 // Set final data size.
1472 set_final_data_size()
1473 { this->set_data_size(this->current_data_size()); }
1476 // Relocate one stub.
1478 relocate_stub(The_reloc_stub*,
1479 const The_relocate_info*,
1480 The_target_aarch64*,
1487 // Owner of this stub table.
1488 The_aarch64_input_section* owner_;
1489 // The relocation stubs.
1490 Reloc_stub_map reloc_stubs_;
1491 // The erratum stubs.
1492 Erratum_stub_set erratum_stubs_;
1493 // Size of reloc stubs.
1494 off_t reloc_stubs_size_;
1495 // Size of erratum stubs.
1496 off_t erratum_stubs_size_;
1497 // data size of this in the previous pass.
1498 off_t prev_data_size_;
1499 }; // End of Stub_table
1502 // Add an erratum stub into the erratum stub set. The set is ordered by
1503 // (relobj, shndx, sh_offset).
1505 template<int size, bool big_endian>
1507 Stub_table<size, big_endian>::add_erratum_stub(The_erratum_stub* stub)
1509 std::pair<Erratum_stub_set_iter, bool> ret =
1510 this->erratum_stubs_.insert(stub);
1511 gold_assert(ret.second);
1512 this->erratum_stubs_size_ = align_address(
1513 this->erratum_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
1514 stub->set_offset(this->erratum_stubs_size_);
1515 this->erratum_stubs_size_ += stub->stub_size();
1519 // Find if such erratum exists for given (obj, shndx, sh_offset).
1521 template<int size, bool big_endian>
1522 Erratum_stub<size, big_endian>*
1523 Stub_table<size, big_endian>::find_erratum_stub(
1524 The_aarch64_relobj* a64relobj, unsigned int shndx, unsigned int sh_offset)
1526 // A dummy object used as key to search in the set.
1527 The_erratum_stub key(a64relobj, ST_NONE,
1529 Erratum_stub_set_iter i = this->erratum_stubs_.find(&key);
1530 if (i != this->erratum_stubs_.end())
1532 The_erratum_stub* stub(*i);
1533 gold_assert(stub->erratum_insn() != 0);
1540 // Find all the errata for a given input section. The return value is a pair of
1541 // iterators [begin, end).
1543 template<int size, bool big_endian>
1544 std::pair<typename Stub_table<size, big_endian>::Erratum_stub_set_iter,
1545 typename Stub_table<size, big_endian>::Erratum_stub_set_iter>
1546 Stub_table<size, big_endian>::find_erratum_stubs_for_input_section(
1547 The_aarch64_relobj* a64relobj, unsigned int shndx)
1549 typedef std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> Result_pair;
1550 Erratum_stub_set_iter start, end;
1551 The_erratum_stub low_key(a64relobj, ST_NONE, shndx, 0);
1552 start = this->erratum_stubs_.lower_bound(&low_key);
1553 if (start == this->erratum_stubs_.end())
1554 return Result_pair(this->erratum_stubs_.end(),
1555 this->erratum_stubs_.end());
1557 while (end != this->erratum_stubs_.end() &&
1558 (*end)->relobj() == a64relobj && (*end)->shndx() == shndx)
1560 return Result_pair(start, end);
1564 // Add a STUB using KEY. The caller is responsible for avoiding addition
1565 // if a STUB with the same key has already been added.
1567 template<int size, bool big_endian>
1569 Stub_table<size, big_endian>::add_reloc_stub(
1570 The_reloc_stub* stub, const The_reloc_stub_key& key)
1572 gold_assert(stub->type() == key.type());
1573 this->reloc_stubs_[key] = stub;
1575 // Assign stub offset early. We can do this because we never remove
1576 // reloc stubs and they are in the beginning of the stub table.
1577 this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_,
1578 The_reloc_stub::STUB_ADDR_ALIGN);
1579 stub->set_offset(this->reloc_stubs_size_);
1580 this->reloc_stubs_size_ += stub->stub_size();
1584 // Relocate all stubs in this stub table.
1586 template<int size, bool big_endian>
1588 Stub_table<size, big_endian>::
1589 relocate_stubs(const The_relocate_info* relinfo,
1590 The_target_aarch64* target_aarch64,
1591 Output_section* output_section,
1592 unsigned char* view,
1593 AArch64_address address,
1594 section_size_type view_size)
1596 // "view_size" is the total size of the stub_table.
1597 gold_assert(address == this->address() &&
1598 view_size == static_cast<section_size_type>(this->data_size()));
1599 for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin();
1600 p != this->reloc_stubs_.end(); ++p)
1601 relocate_stub(p->second, relinfo, target_aarch64, output_section,
1602 view, address, view_size);
1604 // Just for convenience.
1605 const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
1607 // Now 'relocate' erratum stubs.
1608 for(Erratum_stub_set_iter i = this->erratum_stubs_.begin();
1609 i != this->erratum_stubs_.end(); ++i)
1611 AArch64_address stub_address = this->erratum_stub_address(*i);
1612 // The address of "b" in the stub that is to be "relocated".
1613 AArch64_address stub_b_insn_address;
1614 // Branch offset that is to be filled in "b" insn.
1616 switch ((*i)->type())
1620 // The 1st insn of the erratum could be a relocation spot,
1621 // in this case we need to fix it with
1622 // "(*i)->erratum_insn()".
1623 elfcpp::Swap<32, big_endian>::writeval(
1624 view + (stub_address - this->address()),
1625 (*i)->erratum_insn());
1626 // For the erratum, the 2nd insn is a b-insn to be patched
1628 stub_b_insn_address = stub_address + 1 * BPI;
1629 b_offset = (*i)->destination_address() - stub_b_insn_address;
1630 AArch64_relocate_functions<size, big_endian>::construct_b(
1631 view + (stub_b_insn_address - this->address()),
1632 ((unsigned int)(b_offset)) & 0xfffffff);
1642 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
1644 template<int size, bool big_endian>
1646 Stub_table<size, big_endian>::
1647 relocate_stub(The_reloc_stub* stub,
1648 const The_relocate_info* relinfo,
1649 The_target_aarch64* target_aarch64,
1650 Output_section* output_section,
1651 unsigned char* view,
1652 AArch64_address address,
1653 section_size_type view_size)
1655 // "offset" is the offset from the beginning of the stub_table.
1656 section_size_type offset = stub->offset();
1657 section_size_type stub_size = stub->stub_size();
1658 // "view_size" is the total size of the stub_table.
1659 gold_assert(offset + stub_size <= view_size);
1661 target_aarch64->relocate_stub(stub, relinfo, output_section,
1662 view + offset, address + offset, view_size);
1666 // Write out the stubs to file.
1668 template<int size, bool big_endian>
1670 Stub_table<size, big_endian>::do_write(Output_file* of)
1672 off_t offset = this->offset();
1673 const section_size_type oview_size =
1674 convert_to_section_size_type(this->data_size());
1675 unsigned char* const oview = of->get_output_view(offset, oview_size);
1677 // Write relocation stubs.
1678 for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
1679 p != this->reloc_stubs_.end(); ++p)
1681 The_reloc_stub* stub = p->second;
1682 AArch64_address address = this->address() + stub->offset();
1683 gold_assert(address ==
1684 align_address(address, The_reloc_stub::STUB_ADDR_ALIGN));
1685 stub->write(oview + stub->offset(), stub->stub_size());
1688 // Write erratum stubs.
1689 unsigned int erratum_stub_start_offset =
1690 align_address(this->reloc_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
1691 for (typename Erratum_stub_set::iterator p = this->erratum_stubs_.begin();
1692 p != this->erratum_stubs_.end(); ++p)
1694 The_erratum_stub* stub(*p);
1695 stub->write(oview + erratum_stub_start_offset + stub->offset(),
1699 of->write_output_view(this->offset(), oview_size, oview);
1703 // AArch64_relobj class.
1705 template<int size, bool big_endian>
1706 class AArch64_relobj : public Sized_relobj_file<size, big_endian>
1709 typedef AArch64_relobj<size, big_endian> This;
1710 typedef Target_aarch64<size, big_endian> The_target_aarch64;
1711 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
1712 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
1713 typedef Stub_table<size, big_endian> The_stub_table;
1714 typedef Erratum_stub<size, big_endian> The_erratum_stub;
1715 typedef typename The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter;
1716 typedef std::vector<The_stub_table*> Stub_table_list;
1717 static const AArch64_address invalid_address =
1718 static_cast<AArch64_address>(-1);
1720 AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset,
1721 const typename elfcpp::Ehdr<size, big_endian>& ehdr)
1722 : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
1729 // Return the stub table of the SHNDX-th section if there is one.
1731 stub_table(unsigned int shndx) const
1733 gold_assert(shndx < this->stub_tables_.size());
1734 return this->stub_tables_[shndx];
1737 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1739 set_stub_table(unsigned int shndx, The_stub_table* stub_table)
1741 gold_assert(shndx < this->stub_tables_.size());
1742 this->stub_tables_[shndx] = stub_table;
1745 // Entrance to errata scanning.
1747 scan_errata(unsigned int shndx,
1748 const elfcpp::Shdr<size, big_endian>&,
1749 Output_section*, const Symbol_table*,
1750 The_target_aarch64*);
1752 // Scan all relocation sections for stub generation.
1754 scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*,
1757 // Whether a section is a scannable text section.
1759 text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int,
1760 const Output_section*, const Symbol_table*);
1762 // Convert regular input section with index SHNDX to a relaxed section.
1764 convert_input_section_to_relaxed_section(unsigned /* shndx */)
1766 // The stubs have relocations and we need to process them after writing
1767 // out the stubs. So relocation now must follow section write.
1768 this->set_relocs_must_follow_section_writes();
1771 // Structure for mapping symbol position.
1772 struct Mapping_symbol_position
1774 Mapping_symbol_position(unsigned int shndx, AArch64_address offset):
1775 shndx_(shndx), offset_(offset)
1778 // "<" comparator used in ordered_map container.
1780 operator<(const Mapping_symbol_position& p) const
1782 return (this->shndx_ < p.shndx_
1783 || (this->shndx_ == p.shndx_ && this->offset_ < p.offset_));
1787 unsigned int shndx_;
1790 AArch64_address offset_;
1793 typedef std::map<Mapping_symbol_position, char> Mapping_symbol_info;
1796 // Post constructor setup.
1800 // Call parent's setup method.
1801 Sized_relobj_file<size, big_endian>::do_setup();
1803 // Initialize look-up tables.
1804 this->stub_tables_.resize(this->shnum());
1808 do_relocate_sections(
1809 const Symbol_table* symtab, const Layout* layout,
1810 const unsigned char* pshdrs, Output_file* of,
1811 typename Sized_relobj_file<size, big_endian>::Views* pviews);
1813 // Count local symbols and (optionally) record mapping info.
1815 do_count_local_symbols(Stringpool_template<char>*,
1816 Stringpool_template<char>*);
1819 // Fix all errata in the object.
1821 fix_errata(typename Sized_relobj_file<size, big_endian>::Views* pviews);
1823 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1826 try_fix_erratum_843419_optimized(
1828 typename Sized_relobj_file<size, big_endian>::View_size&);
1830 // Whether a section needs to be scanned for relocation stubs.
1832 section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&,
1833 const Relobj::Output_sections&,
1834 const Symbol_table*, const unsigned char*);
1836 // List of stub tables.
1837 Stub_table_list stub_tables_;
1839 // Mapping symbol information sorted by (section index, section_offset).
1840 Mapping_symbol_info mapping_symbol_info_;
1841 }; // End of AArch64_relobj
1844 // Override to record mapping symbol information.
1845 template<int size, bool big_endian>
1847 AArch64_relobj<size, big_endian>::do_count_local_symbols(
1848 Stringpool_template<char>* pool, Stringpool_template<char>* dynpool)
1850 Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool);
1852 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1853 // processing if not fixing erratum.
1854 if (!parameters->options().fix_cortex_a53_843419()
1855 && !parameters->options().fix_cortex_a53_835769())
1858 const unsigned int loccount = this->local_symbol_count();
1862 // Read the symbol table section header.
1863 const unsigned int symtab_shndx = this->symtab_shndx();
1864 elfcpp::Shdr<size, big_endian>
1865 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
1866 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
1868 // Read the local symbols.
1869 const int sym_size =elfcpp::Elf_sizes<size>::sym_size;
1870 gold_assert(loccount == symtabshdr.get_sh_info());
1871 off_t locsize = loccount * sym_size;
1872 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
1873 locsize, true, true);
1875 // For mapping symbol processing, we need to read the symbol names.
1876 unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
1877 if (strtab_shndx >= this->shnum())
1879 this->error(_("invalid symbol table name index: %u"), strtab_shndx);
1883 elfcpp::Shdr<size, big_endian>
1884 strtabshdr(this, this->elf_file()->section_header(strtab_shndx));
1885 if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
1887 this->error(_("symbol table name section has wrong type: %u"),
1888 static_cast<unsigned int>(strtabshdr.get_sh_type()));
1892 const char* pnames =
1893 reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(),
1894 strtabshdr.get_sh_size(),
1897 // Skip the first dummy symbol.
1899 typename Sized_relobj_file<size, big_endian>::Local_values*
1900 plocal_values = this->local_values();
1901 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
1903 elfcpp::Sym<size, big_endian> sym(psyms);
1904 Symbol_value<size>& lv((*plocal_values)[i]);
1905 AArch64_address input_value = lv.input_value();
1907 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1908 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1910 // Mapping symbols could be one of the following 4 forms -
1915 const char* sym_name = pnames + sym.get_st_name();
1916 if (sym_name[0] == '$' && (sym_name[1] == 'x' || sym_name[1] == 'd')
1917 && (sym_name[2] == '\0' || sym_name[2] == '.'))
1920 unsigned int input_shndx =
1921 this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary);
1922 gold_assert(is_ordinary);
1924 Mapping_symbol_position msp(input_shndx, input_value);
1925 // Insert mapping_symbol_info into map whose ordering is defined by
1926 // (shndx, offset_within_section).
1927 this->mapping_symbol_info_[msp] = sym_name[1];
1933 // Fix all errata in the object.
1935 template<int size, bool big_endian>
1937 AArch64_relobj<size, big_endian>::fix_errata(
1938 typename Sized_relobj_file<size, big_endian>::Views* pviews)
1940 typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
1941 unsigned int shnum = this->shnum();
1942 for (unsigned int i = 1; i < shnum; ++i)
1944 The_stub_table* stub_table = this->stub_table(i);
1947 std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
1948 ipair(stub_table->find_erratum_stubs_for_input_section(this, i));
1949 Erratum_stub_set_iter p = ipair.first, end = ipair.second;
1952 The_erratum_stub* stub = *p;
1953 typename Sized_relobj_file<size, big_endian>::View_size&
1954 pview((*pviews)[i]);
1956 // Double check data before fix.
1957 gold_assert(pview.address + stub->sh_offset()
1958 == stub->erratum_address());
1960 // Update previously recorded erratum insn with relocated
1963 reinterpret_cast<Insntype*>(pview.view + stub->sh_offset());
1964 Insntype insn_to_fix = ip[0];
1965 stub->update_erratum_insn(insn_to_fix);
1967 // First try to see if erratum is 843419 and if it can be fixed
1968 // without using branch-to-stub.
1969 if (!try_fix_erratum_843419_optimized(stub, pview))
1971 // Replace the erratum insn with a branch-to-stub.
1972 AArch64_address stub_address =
1973 stub_table->erratum_stub_address(stub);
1974 unsigned int b_offset = stub_address - stub->erratum_address();
1975 AArch64_relocate_functions<size, big_endian>::construct_b(
1976 pview.view + stub->sh_offset(), b_offset & 0xfffffff);
1984 // This is an optimization for 843419. This erratum requires the sequence begin
1985 // with 'adrp', when final value calculated by adrp fits in adr, we can just
1986 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
1987 // in this case, we do not delete the erratum stub (too late to do so), it is
1988 // merely generated without ever being called.)
1990 template<int size, bool big_endian>
1992 AArch64_relobj<size, big_endian>::try_fix_erratum_843419_optimized(
1993 The_erratum_stub* stub,
1994 typename Sized_relobj_file<size, big_endian>::View_size& pview)
1996 if (stub->type() != ST_E_843419)
1999 typedef AArch64_insn_utilities<big_endian> Insn_utilities;
2000 typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
2001 E843419_stub<size, big_endian>* e843419_stub =
2002 reinterpret_cast<E843419_stub<size, big_endian>*>(stub);
2003 AArch64_address pc = pview.address + e843419_stub->adrp_sh_offset();
2004 Insntype* adrp_view = reinterpret_cast<Insntype*>(
2005 pview.view + e843419_stub->adrp_sh_offset());
2006 Insntype adrp_insn = adrp_view[0];
2007 gold_assert(Insn_utilities::is_adrp(adrp_insn));
2008 // Get adrp 33-bit signed imm value.
2009 int64_t adrp_imm = Insn_utilities::
2010 aarch64_adrp_decode_imm(adrp_insn);
2011 // adrp - final value transferred to target register is calculated as:
2012 // PC[11:0] = Zeros(12)
2013 // adrp_dest_value = PC + adrp_imm;
2014 int64_t adrp_dest_value = (pc & ~((1 << 12) - 1)) + adrp_imm;
2015 // adr -final value transferred to target register is calucalted as:
2018 // PC + adr_imm = adrp_dest_value
2020 // adr_imm = adrp_dest_value - PC
2021 int64_t adr_imm = adrp_dest_value - pc;
2022 // Check if imm fits in adr (21-bit signed).
2023 if (-(1 << 20) <= adr_imm && adr_imm < (1 << 20))
2025 // Convert 'adrp' into 'adr'.
2026 Insntype adr_insn = adrp_insn & ((1u << 31) - 1);
2027 adr_insn = Insn_utilities::
2028 aarch64_adr_encode_imm(adr_insn, adr_imm);
2029 elfcpp::Swap<32, big_endian>::writeval(adrp_view, adr_insn);
2036 // Relocate sections.
2038 template<int size, bool big_endian>
2040 AArch64_relobj<size, big_endian>::do_relocate_sections(
2041 const Symbol_table* symtab, const Layout* layout,
2042 const unsigned char* pshdrs, Output_file* of,
2043 typename Sized_relobj_file<size, big_endian>::Views* pviews)
2045 // Call parent to relocate sections.
2046 Sized_relobj_file<size, big_endian>::do_relocate_sections(symtab, layout,
2047 pshdrs, of, pviews);
2049 // We do not generate stubs if doing a relocatable link.
2050 if (parameters->options().relocatable())
2053 if (parameters->options().fix_cortex_a53_843419()
2054 || parameters->options().fix_cortex_a53_835769())
2055 this->fix_errata(pviews);
2057 Relocate_info<size, big_endian> relinfo;
2058 relinfo.symtab = symtab;
2059 relinfo.layout = layout;
2060 relinfo.object = this;
2062 // Relocate stub tables.
2063 unsigned int shnum = this->shnum();
2064 The_target_aarch64* target = The_target_aarch64::current_target();
2066 for (unsigned int i = 1; i < shnum; ++i)
2068 The_aarch64_input_section* aarch64_input_section =
2069 target->find_aarch64_input_section(this, i);
2070 if (aarch64_input_section != NULL
2071 && aarch64_input_section->is_stub_table_owner()
2072 && !aarch64_input_section->stub_table()->empty())
2074 Output_section* os = this->output_section(i);
2075 gold_assert(os != NULL);
2077 relinfo.reloc_shndx = elfcpp::SHN_UNDEF;
2078 relinfo.reloc_shdr = NULL;
2079 relinfo.data_shndx = i;
2080 relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size;
2082 typename Sized_relobj_file<size, big_endian>::View_size&
2083 view_struct = (*pviews)[i];
2084 gold_assert(view_struct.view != NULL);
2086 The_stub_table* stub_table = aarch64_input_section->stub_table();
2087 off_t offset = stub_table->address() - view_struct.address;
2088 unsigned char* view = view_struct.view + offset;
2089 AArch64_address address = stub_table->address();
2090 section_size_type view_size = stub_table->data_size();
2091 stub_table->relocate_stubs(&relinfo, target, os, view, address,
2098 // Determine if an input section is scannable for stub processing. SHDR is
2099 // the header of the section and SHNDX is the section index. OS is the output
2100 // section for the input section and SYMTAB is the global symbol table used to
2101 // look up ICF information.
2103 template<int size, bool big_endian>
2105 AArch64_relobj<size, big_endian>::text_section_is_scannable(
2106 const elfcpp::Shdr<size, big_endian>& text_shdr,
2107 unsigned int text_shndx,
2108 const Output_section* os,
2109 const Symbol_table* symtab)
2111 // Skip any empty sections, unallocated sections or sections whose
2112 // type are not SHT_PROGBITS.
2113 if (text_shdr.get_sh_size() == 0
2114 || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0
2115 || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
2118 // Skip any discarded or ICF'ed sections.
2119 if (os == NULL || symtab->is_section_folded(this, text_shndx))
2122 // Skip exception frame.
2123 if (strcmp(os->name(), ".eh_frame") == 0)
2126 gold_assert(!this->is_output_section_offset_invalid(text_shndx) ||
2127 os->find_relaxed_input_section(this, text_shndx) != NULL);
2133 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2134 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2136 template<int size, bool big_endian>
2138 AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning(
2139 const elfcpp::Shdr<size, big_endian>& shdr,
2140 const Relobj::Output_sections& out_sections,
2141 const Symbol_table* symtab,
2142 const unsigned char* pshdrs)
2144 unsigned int sh_type = shdr.get_sh_type();
2145 if (sh_type != elfcpp::SHT_RELA)
2148 // Ignore empty section.
2149 off_t sh_size = shdr.get_sh_size();
2153 // Ignore reloc section with unexpected symbol table. The
2154 // error will be reported in the final link.
2155 if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx())
2158 gold_assert(sh_type == elfcpp::SHT_RELA);
2159 unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
2161 // Ignore reloc section with unexpected entsize or uneven size.
2162 // The error will be reported in the final link.
2163 if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0)
2166 // Ignore reloc section with bad info. This error will be
2167 // reported in the final link.
2168 unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info());
2169 if (text_shndx >= this->shnum())
2172 const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
2173 const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs +
2174 text_shndx * shdr_size);
2175 return this->text_section_is_scannable(text_shdr, text_shndx,
2176 out_sections[text_shndx], symtab);
2180 // Scan section SHNDX for erratum 843419 and 835769.
2182 template<int size, bool big_endian>
2184 AArch64_relobj<size, big_endian>::scan_errata(
2185 unsigned int shndx, const elfcpp::Shdr<size, big_endian>& shdr,
2186 Output_section* os, const Symbol_table* symtab,
2187 The_target_aarch64* target)
2189 if (shdr.get_sh_size() == 0
2190 || (shdr.get_sh_flags() &
2191 (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) == 0
2192 || shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
2195 if (!os || symtab->is_section_folded(this, shndx)) return;
2197 AArch64_address output_offset = this->get_output_section_offset(shndx);
2198 AArch64_address output_address;
2199 if (output_offset != invalid_address)
2200 output_address = os->address() + output_offset;
2203 const Output_relaxed_input_section* poris =
2204 os->find_relaxed_input_section(this, shndx);
2206 output_address = poris->address();
2209 section_size_type input_view_size = 0;
2210 const unsigned char* input_view =
2211 this->section_contents(shndx, &input_view_size, false);
2213 Mapping_symbol_position section_start(shndx, 0);
2214 // Find the first mapping symbol record within section shndx.
2215 typename Mapping_symbol_info::const_iterator p =
2216 this->mapping_symbol_info_.lower_bound(section_start);
2217 while (p != this->mapping_symbol_info_.end() &&
2218 p->first.shndx_ == shndx)
2220 typename Mapping_symbol_info::const_iterator prev = p;
2222 if (prev->second == 'x')
2224 section_size_type span_start =
2225 convert_to_section_size_type(prev->first.offset_);
2226 section_size_type span_end;
2227 if (p != this->mapping_symbol_info_.end()
2228 && p->first.shndx_ == shndx)
2229 span_end = convert_to_section_size_type(p->first.offset_);
2231 span_end = convert_to_section_size_type(shdr.get_sh_size());
2233 // Here we do not share the scanning code of both errata. For 843419,
2234 // only the last few insns of each page are examined, which is fast,
2235 // whereas, for 835769, every insn pair needs to be checked.
2237 if (parameters->options().fix_cortex_a53_843419())
2238 target->scan_erratum_843419_span(
2239 this, shndx, span_start, span_end,
2240 const_cast<unsigned char*>(input_view), output_address);
2242 if (parameters->options().fix_cortex_a53_835769())
2243 target->scan_erratum_835769_span(
2244 this, shndx, span_start, span_end,
2245 const_cast<unsigned char*>(input_view), output_address);
2251 // Scan relocations for stub generation.
2253 template<int size, bool big_endian>
2255 AArch64_relobj<size, big_endian>::scan_sections_for_stubs(
2256 The_target_aarch64* target,
2257 const Symbol_table* symtab,
2258 const Layout* layout)
2260 unsigned int shnum = this->shnum();
2261 const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
2263 // Read the section headers.
2264 const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
2268 // To speed up processing, we set up hash tables for fast lookup of
2269 // input offsets to output addresses.
2270 this->initialize_input_to_output_maps();
2272 const Relobj::Output_sections& out_sections(this->output_sections());
2274 Relocate_info<size, big_endian> relinfo;
2275 relinfo.symtab = symtab;
2276 relinfo.layout = layout;
2277 relinfo.object = this;
2279 // Do relocation stubs scanning.
2280 const unsigned char* p = pshdrs + shdr_size;
2281 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
2283 const elfcpp::Shdr<size, big_endian> shdr(p);
2284 if (parameters->options().fix_cortex_a53_843419()
2285 || parameters->options().fix_cortex_a53_835769())
2286 scan_errata(i, shdr, out_sections[i], symtab, target);
2287 if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab,
2290 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
2291 AArch64_address output_offset =
2292 this->get_output_section_offset(index);
2293 AArch64_address output_address;
2294 if (output_offset != invalid_address)
2296 output_address = out_sections[index]->address() + output_offset;
2300 // Currently this only happens for a relaxed section.
2301 const Output_relaxed_input_section* poris =
2302 out_sections[index]->find_relaxed_input_section(this, index);
2303 gold_assert(poris != NULL);
2304 output_address = poris->address();
2307 // Get the relocations.
2308 const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
2312 // Get the section contents.
2313 section_size_type input_view_size = 0;
2314 const unsigned char* input_view =
2315 this->section_contents(index, &input_view_size, false);
2317 relinfo.reloc_shndx = i;
2318 relinfo.data_shndx = index;
2319 unsigned int sh_type = shdr.get_sh_type();
2320 unsigned int reloc_size;
2321 gold_assert (sh_type == elfcpp::SHT_RELA);
2322 reloc_size = elfcpp::Elf_sizes<size>::rela_size;
2324 Output_section* os = out_sections[index];
2325 target->scan_section_for_stubs(&relinfo, sh_type, prelocs,
2326 shdr.get_sh_size() / reloc_size,
2328 output_offset == invalid_address,
2329 input_view, output_address,
2336 // A class to wrap an ordinary input section containing executable code.
2338 template<int size, bool big_endian>
2339 class AArch64_input_section : public Output_relaxed_input_section
2342 typedef Stub_table<size, big_endian> The_stub_table;
2344 AArch64_input_section(Relobj* relobj, unsigned int shndx)
2345 : Output_relaxed_input_section(relobj, shndx, 1),
2347 original_contents_(NULL), original_size_(0),
2348 original_addralign_(1)
2351 ~AArch64_input_section()
2352 { delete[] this->original_contents_; }
2358 // Set the stub_table.
2360 set_stub_table(The_stub_table* st)
2361 { this->stub_table_ = st; }
2363 // Whether this is a stub table owner.
2365 is_stub_table_owner() const
2366 { return this->stub_table_ != NULL && this->stub_table_->owner() == this; }
2368 // Return the original size of the section.
2370 original_size() const
2371 { return this->original_size_; }
2373 // Return the stub table.
2376 { return stub_table_; }
2379 // Write out this input section.
2381 do_write(Output_file*);
2383 // Return required alignment of this.
2385 do_addralign() const
2387 if (this->is_stub_table_owner())
2388 return std::max(this->stub_table_->addralign(),
2389 static_cast<uint64_t>(this->original_addralign_));
2391 return this->original_addralign_;
2394 // Finalize data size.
2396 set_final_data_size();
2398 // Reset address and file offset.
2400 do_reset_address_and_file_offset();
2404 do_output_offset(const Relobj* object, unsigned int shndx,
2405 section_offset_type offset,
2406 section_offset_type* poutput) const
2408 if ((object == this->relobj())
2409 && (shndx == this->shndx())
2412 convert_types<section_offset_type, uint32_t>(this->original_size_)))
2422 // Copying is not allowed.
2423 AArch64_input_section(const AArch64_input_section&);
2424 AArch64_input_section& operator=(const AArch64_input_section&);
2426 // The relocation stubs.
2427 The_stub_table* stub_table_;
2428 // Original section contents. We have to make a copy here since the file
2429 // containing the original section may not be locked when we need to access
2431 unsigned char* original_contents_;
2432 // Section size of the original input section.
2433 uint32_t original_size_;
2434 // Address alignment of the original input section.
2435 uint32_t original_addralign_;
2436 }; // End of AArch64_input_section
2439 // Finalize data size.
2441 template<int size, bool big_endian>
2443 AArch64_input_section<size, big_endian>::set_final_data_size()
2445 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
2447 if (this->is_stub_table_owner())
2449 this->stub_table_->finalize_data_size();
2450 off = align_address(off, this->stub_table_->addralign());
2451 off += this->stub_table_->data_size();
2453 this->set_data_size(off);
2457 // Reset address and file offset.
2459 template<int size, bool big_endian>
2461 AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset()
2463 // Size of the original input section contents.
2464 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
2466 // If this is a stub table owner, account for the stub table size.
2467 if (this->is_stub_table_owner())
2469 The_stub_table* stub_table = this->stub_table_;
2471 // Reset the stub table's address and file offset. The
2472 // current data size for child will be updated after that.
2473 stub_table_->reset_address_and_file_offset();
2474 off = align_address(off, stub_table_->addralign());
2475 off += stub_table->current_data_size();
2478 this->set_current_data_size(off);
2482 // Initialize an Arm_input_section.
2484 template<int size, bool big_endian>
2486 AArch64_input_section<size, big_endian>::init()
2488 Relobj* relobj = this->relobj();
2489 unsigned int shndx = this->shndx();
2491 // We have to cache original size, alignment and contents to avoid locking
2492 // the original file.
2493 this->original_addralign_ =
2494 convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx));
2496 // This is not efficient but we expect only a small number of relaxed
2497 // input sections for stubs.
2498 section_size_type section_size;
2499 const unsigned char* section_contents =
2500 relobj->section_contents(shndx, §ion_size, false);
2501 this->original_size_ =
2502 convert_types<uint32_t, uint64_t>(relobj->section_size(shndx));
2504 gold_assert(this->original_contents_ == NULL);
2505 this->original_contents_ = new unsigned char[section_size];
2506 memcpy(this->original_contents_, section_contents, section_size);
2508 // We want to make this look like the original input section after
2509 // output sections are finalized.
2510 Output_section* os = relobj->output_section(shndx);
2511 off_t offset = relobj->output_section_offset(shndx);
2512 gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx));
2513 this->set_address(os->address() + offset);
2514 this->set_file_offset(os->offset() + offset);
2515 this->set_current_data_size(this->original_size_);
2516 this->finalize_data_size();
2520 // Write data to output file.
2522 template<int size, bool big_endian>
2524 AArch64_input_section<size, big_endian>::do_write(Output_file* of)
2526 // We have to write out the original section content.
2527 gold_assert(this->original_contents_ != NULL);
2528 of->write(this->offset(), this->original_contents_,
2529 this->original_size_);
2531 // If this owns a stub table and it is not empty, write it.
2532 if (this->is_stub_table_owner() && !this->stub_table_->empty())
2533 this->stub_table_->write(of);
2537 // Arm output section class. This is defined mainly to add a number of stub
2538 // generation methods.
2540 template<int size, bool big_endian>
2541 class AArch64_output_section : public Output_section
2544 typedef Target_aarch64<size, big_endian> The_target_aarch64;
2545 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
2546 typedef Stub_table<size, big_endian> The_stub_table;
2547 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
2550 AArch64_output_section(const char* name, elfcpp::Elf_Word type,
2551 elfcpp::Elf_Xword flags)
2552 : Output_section(name, type, flags)
2555 ~AArch64_output_section() {}
2557 // Group input sections for stub generation.
2559 group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*,
2563 typedef Output_section::Input_section Input_section;
2564 typedef Output_section::Input_section_list Input_section_list;
2566 // Create a stub group.
2568 create_stub_group(Input_section_list::const_iterator,
2569 Input_section_list::const_iterator,
2570 Input_section_list::const_iterator,
2571 The_target_aarch64*,
2572 std::vector<Output_relaxed_input_section*>&,
2574 }; // End of AArch64_output_section
2577 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2578 // the input section that will be the owner of the stub table.
2580 template<int size, bool big_endian> void
2581 AArch64_output_section<size, big_endian>::create_stub_group(
2582 Input_section_list::const_iterator first,
2583 Input_section_list::const_iterator last,
2584 Input_section_list::const_iterator owner,
2585 The_target_aarch64* target,
2586 std::vector<Output_relaxed_input_section*>& new_relaxed_sections,
2589 // Currently we convert ordinary input sections into relaxed sections only
2591 The_aarch64_input_section* input_section;
2592 if (owner->is_relaxed_input_section())
2596 gold_assert(owner->is_input_section());
2597 // Create a new relaxed input section. We need to lock the original
2599 Task_lock_obj<Object> tl(task, owner->relobj());
2601 target->new_aarch64_input_section(owner->relobj(), owner->shndx());
2602 new_relaxed_sections.push_back(input_section);
2605 // Create a stub table.
2606 The_stub_table* stub_table =
2607 target->new_stub_table(input_section);
2609 input_section->set_stub_table(stub_table);
2611 Input_section_list::const_iterator p = first;
2612 // Look for input sections or relaxed input sections in [first ... last].
2615 if (p->is_input_section() || p->is_relaxed_input_section())
2617 // The stub table information for input sections live
2618 // in their objects.
2619 The_aarch64_relobj* aarch64_relobj =
2620 static_cast<The_aarch64_relobj*>(p->relobj());
2621 aarch64_relobj->set_stub_table(p->shndx(), stub_table);
2624 while (p++ != last);
2628 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2629 // stub groups. We grow a stub group by adding input section until the size is
2630 // just below GROUP_SIZE. The last input section will be converted into a stub
2631 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2632 // after the stub table, effectively doubling the group size.
2634 // This is similar to the group_sections() function in elf32-arm.c but is
2635 // implemented differently.
2637 template<int size, bool big_endian>
2638 void AArch64_output_section<size, big_endian>::group_sections(
2639 section_size_type group_size,
2640 bool stubs_always_after_branch,
2641 Target_aarch64<size, big_endian>* target,
2647 FINDING_STUB_SECTION,
2651 std::vector<Output_relaxed_input_section*> new_relaxed_sections;
2653 State state = NO_GROUP;
2654 section_size_type off = 0;
2655 section_size_type group_begin_offset = 0;
2656 section_size_type group_end_offset = 0;
2657 section_size_type stub_table_end_offset = 0;
2658 Input_section_list::const_iterator group_begin =
2659 this->input_sections().end();
2660 Input_section_list::const_iterator stub_table =
2661 this->input_sections().end();
2662 Input_section_list::const_iterator group_end = this->input_sections().end();
2663 for (Input_section_list::const_iterator p = this->input_sections().begin();
2664 p != this->input_sections().end();
2667 section_size_type section_begin_offset =
2668 align_address(off, p->addralign());
2669 section_size_type section_end_offset =
2670 section_begin_offset + p->data_size();
2672 // Check to see if we should group the previously seen sections.
2678 case FINDING_STUB_SECTION:
2679 // Adding this section makes the group larger than GROUP_SIZE.
2680 if (section_end_offset - group_begin_offset >= group_size)
2682 if (stubs_always_after_branch)
2684 gold_assert(group_end != this->input_sections().end());
2685 this->create_stub_group(group_begin, group_end, group_end,
2686 target, new_relaxed_sections,
2692 // Input sections up to stub_group_size bytes after the stub
2693 // table can be handled by it too.
2694 state = HAS_STUB_SECTION;
2695 stub_table = group_end;
2696 stub_table_end_offset = group_end_offset;
2701 case HAS_STUB_SECTION:
2702 // Adding this section makes the post stub-section group larger
2705 // NOT SUPPORTED YET. For completeness only.
2706 if (section_end_offset - stub_table_end_offset >= group_size)
2708 gold_assert(group_end != this->input_sections().end());
2709 this->create_stub_group(group_begin, group_end, stub_table,
2710 target, new_relaxed_sections, task);
2719 // If we see an input section and currently there is no group, start
2720 // a new one. Skip any empty sections. We look at the data size
2721 // instead of calling p->relobj()->section_size() to avoid locking.
2722 if ((p->is_input_section() || p->is_relaxed_input_section())
2723 && (p->data_size() != 0))
2725 if (state == NO_GROUP)
2727 state = FINDING_STUB_SECTION;
2729 group_begin_offset = section_begin_offset;
2732 // Keep track of the last input section seen.
2734 group_end_offset = section_end_offset;
2737 off = section_end_offset;
2740 // Create a stub group for any ungrouped sections.
2741 if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION)
2743 gold_assert(group_end != this->input_sections().end());
2744 this->create_stub_group(group_begin, group_end,
2745 (state == FINDING_STUB_SECTION
2748 target, new_relaxed_sections, task);
2751 if (!new_relaxed_sections.empty())
2752 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections);
2754 // Update the section offsets
2755 for (size_t i = 0; i < new_relaxed_sections.size(); ++i)
2757 The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>(
2758 new_relaxed_sections[i]->relobj());
2759 unsigned int shndx = new_relaxed_sections[i]->shndx();
2760 // Tell AArch64_relobj that this input section is converted.
2761 relobj->convert_input_section_to_relaxed_section(shndx);
2763 } // End of AArch64_output_section::group_sections
2766 AArch64_reloc_property_table* aarch64_reloc_property_table = NULL;
2769 // The aarch64 target class.
2771 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2772 template<int size, bool big_endian>
2773 class Target_aarch64 : public Sized_target<size, big_endian>
2776 typedef Target_aarch64<size, big_endian> This;
2777 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
2779 typedef Relocate_info<size, big_endian> The_relocate_info;
2780 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
2781 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
2782 typedef Reloc_stub<size, big_endian> The_reloc_stub;
2783 typedef Erratum_stub<size, big_endian> The_erratum_stub;
2784 typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key;
2785 typedef Stub_table<size, big_endian> The_stub_table;
2786 typedef std::vector<The_stub_table*> Stub_table_list;
2787 typedef typename Stub_table_list::iterator Stub_table_iterator;
2788 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
2789 typedef AArch64_output_section<size, big_endian> The_aarch64_output_section;
2790 typedef Unordered_map<Section_id,
2791 AArch64_input_section<size, big_endian>*,
2792 Section_id_hash> AArch64_input_section_map;
2793 typedef AArch64_insn_utilities<big_endian> Insn_utilities;
2794 const static int TCB_SIZE = size / 8 * 2;
2796 Target_aarch64(const Target::Target_info* info = &aarch64_info)
2797 : Sized_target<size, big_endian>(info),
2798 got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
2799 got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
2800 rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY),
2801 got_mod_index_offset_(-1U),
2802 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2803 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2806 // Scan the relocations to determine unreferenced sections for
2807 // garbage collection.
2809 gc_process_relocs(Symbol_table* symtab,
2811 Sized_relobj_file<size, big_endian>* object,
2812 unsigned int data_shndx,
2813 unsigned int sh_type,
2814 const unsigned char* prelocs,
2816 Output_section* output_section,
2817 bool needs_special_offset_handling,
2818 size_t local_symbol_count,
2819 const unsigned char* plocal_symbols);
2821 // Scan the relocations to look for symbol adjustments.
2823 scan_relocs(Symbol_table* symtab,
2825 Sized_relobj_file<size, big_endian>* object,
2826 unsigned int data_shndx,
2827 unsigned int sh_type,
2828 const unsigned char* prelocs,
2830 Output_section* output_section,
2831 bool needs_special_offset_handling,
2832 size_t local_symbol_count,
2833 const unsigned char* plocal_symbols);
2835 // Finalize the sections.
2837 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2839 // Return the value to use for a dynamic which requires special
2842 do_dynsym_value(const Symbol*) const;
2844 // Relocate a section.
2846 relocate_section(const Relocate_info<size, big_endian>*,
2847 unsigned int sh_type,
2848 const unsigned char* prelocs,
2850 Output_section* output_section,
2851 bool needs_special_offset_handling,
2852 unsigned char* view,
2853 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
2854 section_size_type view_size,
2855 const Reloc_symbol_changes*);
2857 // Scan the relocs during a relocatable link.
2859 scan_relocatable_relocs(Symbol_table* symtab,
2861 Sized_relobj_file<size, big_endian>* object,
2862 unsigned int data_shndx,
2863 unsigned int sh_type,
2864 const unsigned char* prelocs,
2866 Output_section* output_section,
2867 bool needs_special_offset_handling,
2868 size_t local_symbol_count,
2869 const unsigned char* plocal_symbols,
2870 Relocatable_relocs*);
2872 // Relocate a section during a relocatable link.
2875 const Relocate_info<size, big_endian>*,
2876 unsigned int sh_type,
2877 const unsigned char* prelocs,
2879 Output_section* output_section,
2880 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
2881 const Relocatable_relocs*,
2882 unsigned char* view,
2883 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
2884 section_size_type view_size,
2885 unsigned char* reloc_view,
2886 section_size_type reloc_view_size);
2888 // Return the symbol index to use for a target specific relocation.
2889 // The only target specific relocation is R_AARCH64_TLSDESC for a
2890 // local symbol, which is an absolute reloc.
2892 do_reloc_symbol_index(void*, unsigned int r_type) const
2894 gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
2898 // Return the addend to use for a target specific relocation.
2900 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
2902 // Return the PLT section.
2904 do_plt_address_for_global(const Symbol* gsym) const
2905 { return this->plt_section()->address_for_global(gsym); }
2908 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
2909 { return this->plt_section()->address_for_local(relobj, symndx); }
2911 // This function should be defined in targets that can use relocation
2912 // types to determine (implemented in local_reloc_may_be_function_pointer
2913 // and global_reloc_may_be_function_pointer)
2914 // if a function's pointer is taken. ICF uses this in safe mode to only
2915 // fold those functions whose pointer is defintely not taken.
2917 do_can_check_for_function_pointers() const
2920 // Return the number of entries in the PLT.
2922 plt_entry_count() const;
2924 //Return the offset of the first non-reserved PLT entry.
2926 first_plt_entry_offset() const;
2928 // Return the size of each PLT entry.
2930 plt_entry_size() const;
2932 // Create a stub table.
2934 new_stub_table(The_aarch64_input_section*);
2936 // Create an aarch64 input section.
2937 The_aarch64_input_section*
2938 new_aarch64_input_section(Relobj*, unsigned int);
2940 // Find an aarch64 input section instance for a given OBJ and SHNDX.
2941 The_aarch64_input_section*
2942 find_aarch64_input_section(Relobj*, unsigned int) const;
2944 // Return the thread control block size.
2946 tcb_size() const { return This::TCB_SIZE; }
2948 // Scan a section for stub generation.
2950 scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int,
2951 const unsigned char*, size_t, Output_section*,
2952 bool, const unsigned char*,
2956 // Scan a relocation section for stub.
2957 template<int sh_type>
2959 scan_reloc_section_for_stubs(
2960 const The_relocate_info* relinfo,
2961 const unsigned char* prelocs,
2963 Output_section* output_section,
2964 bool needs_special_offset_handling,
2965 const unsigned char* view,
2966 Address view_address,
2969 // Relocate a single stub.
2971 relocate_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*,
2972 Output_section*, unsigned char*, Address,
2975 // Get the default AArch64 target.
2979 gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64
2980 && parameters->target().get_size() == size
2981 && parameters->target().is_big_endian() == big_endian);
2982 return static_cast<This*>(parameters->sized_target<size, big_endian>());
2986 // Scan erratum 843419 for a part of a section.
2988 scan_erratum_843419_span(
2989 AArch64_relobj<size, big_endian>*,
2991 const section_size_type,
2992 const section_size_type,
2996 // Scan erratum 835769 for a part of a section.
2998 scan_erratum_835769_span(
2999 AArch64_relobj<size, big_endian>*,
3001 const section_size_type,
3002 const section_size_type,
3008 do_select_as_default_target()
3010 gold_assert(aarch64_reloc_property_table == NULL);
3011 aarch64_reloc_property_table = new AArch64_reloc_property_table();
3014 // Add a new reloc argument, returning the index in the vector.
3016 add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object,
3019 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
3020 return this->tlsdesc_reloc_info_.size() - 1;
3023 virtual Output_data_plt_aarch64<size, big_endian>*
3024 do_make_data_plt(Layout* layout,
3025 Output_data_got_aarch64<size, big_endian>* got,
3026 Output_data_space* got_plt,
3027 Output_data_space* got_irelative)
3029 return new Output_data_plt_aarch64_standard<size, big_endian>(
3030 layout, got, got_plt, got_irelative);
3034 // do_make_elf_object to override the same function in the base class.
3036 do_make_elf_object(const std::string&, Input_file*, off_t,
3037 const elfcpp::Ehdr<size, big_endian>&);
3039 Output_data_plt_aarch64<size, big_endian>*
3040 make_data_plt(Layout* layout,
3041 Output_data_got_aarch64<size, big_endian>* got,
3042 Output_data_space* got_plt,
3043 Output_data_space* got_irelative)
3045 return this->do_make_data_plt(layout, got, got_plt, got_irelative);
3048 // We only need to generate stubs, and hence perform relaxation if we are
3049 // not doing relocatable linking.
3051 do_may_relax() const
3052 { return !parameters->options().relocatable(); }
3054 // Relaxation hook. This is where we do stub generation.
3056 do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
3059 group_sections(Layout* layout,
3060 section_size_type group_size,
3061 bool stubs_always_after_branch,
3065 scan_reloc_for_stub(const The_relocate_info*, unsigned int,
3066 const Sized_symbol<size>*, unsigned int,
3067 const Symbol_value<size>*,
3068 typename elfcpp::Elf_types<size>::Elf_Swxword,
3071 // Make an output section.
3073 do_make_output_section(const char* name, elfcpp::Elf_Word type,
3074 elfcpp::Elf_Xword flags)
3075 { return new The_aarch64_output_section(name, type, flags); }
3078 // The class which scans relocations.
3083 : issued_non_pic_error_(false)
3087 local(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
3088 Sized_relobj_file<size, big_endian>* object,
3089 unsigned int data_shndx,
3090 Output_section* output_section,
3091 const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
3092 const elfcpp::Sym<size, big_endian>& lsym,
3096 global(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
3097 Sized_relobj_file<size, big_endian>* object,
3098 unsigned int data_shndx,
3099 Output_section* output_section,
3100 const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
3104 local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
3105 Target_aarch64<size, big_endian>* ,
3106 Sized_relobj_file<size, big_endian>* ,
3109 const elfcpp::Rela<size, big_endian>& ,
3110 unsigned int r_type,
3111 const elfcpp::Sym<size, big_endian>&);
3114 global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
3115 Target_aarch64<size, big_endian>* ,
3116 Sized_relobj_file<size, big_endian>* ,
3119 const elfcpp::Rela<size, big_endian>& ,
3120 unsigned int r_type,
3125 unsupported_reloc_local(Sized_relobj_file<size, big_endian>*,
3126 unsigned int r_type);
3129 unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
3130 unsigned int r_type, Symbol*);
3133 possible_function_pointer_reloc(unsigned int r_type);
3136 check_non_pic(Relobj*, unsigned int r_type);
3139 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*,
3140 unsigned int r_type);
3142 // Whether we have issued an error about a non-PIC compilation.
3143 bool issued_non_pic_error_;
3146 // The class which implements relocation.
3151 : skip_call_tls_get_addr_(false)
3157 // Do a relocation. Return false if the caller should not issue
3158 // any warnings about this relocation.
3160 relocate(const Relocate_info<size, big_endian>*, Target_aarch64*,
3162 size_t relnum, const elfcpp::Rela<size, big_endian>&,
3163 unsigned int r_type, const Sized_symbol<size>*,
3164 const Symbol_value<size>*,
3165 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
3169 inline typename AArch64_relocate_functions<size, big_endian>::Status
3170 relocate_tls(const Relocate_info<size, big_endian>*,
3171 Target_aarch64<size, big_endian>*,
3173 const elfcpp::Rela<size, big_endian>&,
3174 unsigned int r_type, const Sized_symbol<size>*,
3175 const Symbol_value<size>*,
3177 typename elfcpp::Elf_types<size>::Elf_Addr);
3179 inline typename AArch64_relocate_functions<size, big_endian>::Status
3181 const Relocate_info<size, big_endian>*,
3182 Target_aarch64<size, big_endian>*,
3183 const elfcpp::Rela<size, big_endian>&,
3186 const Symbol_value<size>*);
3188 inline typename AArch64_relocate_functions<size, big_endian>::Status
3190 const Relocate_info<size, big_endian>*,
3191 Target_aarch64<size, big_endian>*,
3192 const elfcpp::Rela<size, big_endian>&,
3195 const Symbol_value<size>*);
3197 inline typename AArch64_relocate_functions<size, big_endian>::Status
3199 const Relocate_info<size, big_endian>*,
3200 Target_aarch64<size, big_endian>*,
3201 const elfcpp::Rela<size, big_endian>&,
3204 const Symbol_value<size>*);
3206 inline typename AArch64_relocate_functions<size, big_endian>::Status
3208 const Relocate_info<size, big_endian>*,
3209 Target_aarch64<size, big_endian>*,
3210 const elfcpp::Rela<size, big_endian>&,
3213 const Symbol_value<size>*);
3215 inline typename AArch64_relocate_functions<size, big_endian>::Status
3217 const Relocate_info<size, big_endian>*,
3218 Target_aarch64<size, big_endian>*,
3219 const elfcpp::Rela<size, big_endian>&,
3222 const Symbol_value<size>*,
3223 typename elfcpp::Elf_types<size>::Elf_Addr,
3224 typename elfcpp::Elf_types<size>::Elf_Addr);
3226 bool skip_call_tls_get_addr_;
3228 }; // End of class Relocate
3230 // A class which returns the size required for a relocation type,
3231 // used while scanning relocs during a relocatable link.
3232 class Relocatable_size_for_reloc
3236 get_size_for_reloc(unsigned int, Relobj*);
3239 // Adjust TLS relocation type based on the options and whether this
3240 // is a local symbol.
3241 static tls::Tls_optimization
3242 optimize_tls_reloc(bool is_final, int r_type);
3244 // Get the GOT section, creating it if necessary.
3245 Output_data_got_aarch64<size, big_endian>*
3246 got_section(Symbol_table*, Layout*);
3248 // Get the GOT PLT section.
3250 got_plt_section() const
3252 gold_assert(this->got_plt_ != NULL);
3253 return this->got_plt_;
3256 // Get the GOT section for TLSDESC entries.
3257 Output_data_got<size, big_endian>*
3258 got_tlsdesc_section() const
3260 gold_assert(this->got_tlsdesc_ != NULL);
3261 return this->got_tlsdesc_;
3264 // Create the PLT section.
3266 make_plt_section(Symbol_table* symtab, Layout* layout);
3268 // Create a PLT entry for a global symbol.
3270 make_plt_entry(Symbol_table*, Layout*, Symbol*);
3272 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3274 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
3275 Sized_relobj_file<size, big_endian>* relobj,
3276 unsigned int local_sym_index);
3278 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3280 define_tls_base_symbol(Symbol_table*, Layout*);
3282 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3284 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
3286 // Create a GOT entry for the TLS module index.
3288 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
3289 Sized_relobj_file<size, big_endian>* object);
3291 // Get the PLT section.
3292 Output_data_plt_aarch64<size, big_endian>*
3295 gold_assert(this->plt_ != NULL);
3299 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3300 // ST_E_843419, we need an additional field for adrp offset.
3301 void create_erratum_stub(
3302 AArch64_relobj<size, big_endian>* relobj,
3304 section_size_type erratum_insn_offset,
3305 Address erratum_address,
3306 typename Insn_utilities::Insntype erratum_insn,
3308 unsigned int e843419_adrp_offset=0);
3310 // Return whether this is a 3-insn erratum sequence.
3311 bool is_erratum_843419_sequence(
3312 typename elfcpp::Swap<32,big_endian>::Valtype insn1,
3313 typename elfcpp::Swap<32,big_endian>::Valtype insn2,
3314 typename elfcpp::Swap<32,big_endian>::Valtype insn3);
3316 // Return whether this is a 835769 sequence.
3317 // (Similarly implemented as in elfnn-aarch64.c.)
3318 bool is_erratum_835769_sequence(
3319 typename elfcpp::Swap<32,big_endian>::Valtype,
3320 typename elfcpp::Swap<32,big_endian>::Valtype);
3322 // Get the dynamic reloc section, creating it if necessary.
3324 rela_dyn_section(Layout*);
3326 // Get the section to use for TLSDESC relocations.
3328 rela_tlsdesc_section(Layout*) const;
3330 // Get the section to use for IRELATIVE relocations.
3332 rela_irelative_section(Layout*);
3334 // Add a potential copy relocation.
3336 copy_reloc(Symbol_table* symtab, Layout* layout,
3337 Sized_relobj_file<size, big_endian>* object,
3338 unsigned int shndx, Output_section* output_section,
3339 Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
3341 this->copy_relocs_.copy_reloc(symtab, layout,
3342 symtab->get_sized_symbol<size>(sym),
3343 object, shndx, output_section,
3344 reloc, this->rela_dyn_section(layout));
3347 // Information about this specific target which we pass to the
3348 // general Target structure.
3349 static const Target::Target_info aarch64_info;
3351 // The types of GOT entries needed for this platform.
3352 // These values are exposed to the ABI in an incremental link.
3353 // Do not renumber existing values without changing the version
3354 // number of the .gnu_incremental_inputs section.
3357 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
3358 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
3359 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
3360 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
3363 // This type is used as the argument to the target specific
3364 // relocation routines. The only target specific reloc is
3365 // R_AARCh64_TLSDESC against a local symbol.
3368 Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object,
3369 unsigned int a_r_sym)
3370 : object(a_object), r_sym(a_r_sym)
3373 // The object in which the local symbol is defined.
3374 Sized_relobj_file<size, big_endian>* object;
3375 // The local symbol index in the object.
3380 Output_data_got_aarch64<size, big_endian>* got_;
3382 Output_data_plt_aarch64<size, big_endian>* plt_;
3383 // The GOT PLT section.
3384 Output_data_space* got_plt_;
3385 // The GOT section for IRELATIVE relocations.
3386 Output_data_space* got_irelative_;
3387 // The GOT section for TLSDESC relocations.
3388 Output_data_got<size, big_endian>* got_tlsdesc_;
3389 // The _GLOBAL_OFFSET_TABLE_ symbol.
3390 Symbol* global_offset_table_;
3391 // The dynamic reloc section.
3392 Reloc_section* rela_dyn_;
3393 // The section to use for IRELATIVE relocs.
3394 Reloc_section* rela_irelative_;
3395 // Relocs saved to avoid a COPY reloc.
3396 Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
3397 // Offset of the GOT entry for the TLS module index.
3398 unsigned int got_mod_index_offset_;
3399 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3400 // specific relocation. Here we store the object and local symbol
3401 // index for the relocation.
3402 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
3403 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3404 bool tls_base_symbol_defined_;
3405 // List of stub_tables
3406 Stub_table_list stub_tables_;
3407 // Actual stub group size
3408 section_size_type stub_group_size_;
3409 AArch64_input_section_map aarch64_input_section_map_;
3410 }; // End of Target_aarch64
3414 const Target::Target_info Target_aarch64<64, false>::aarch64_info =
3417 false, // is_big_endian
3418 elfcpp::EM_AARCH64, // machine_code
3419 false, // has_make_symbol
3420 false, // has_resolve
3421 false, // has_code_fill
3422 true, // is_default_stack_executable
3423 true, // can_icf_inline_merge_sections
3425 "/lib/ld.so.1", // program interpreter
3426 0x400000, // default_text_segment_address
3427 0x10000, // abi_pagesize (overridable by -z max-page-size)
3428 0x1000, // common_pagesize (overridable by -z common-page-size)
3429 false, // isolate_execinstr
3431 elfcpp::SHN_UNDEF, // small_common_shndx
3432 elfcpp::SHN_UNDEF, // large_common_shndx
3433 0, // small_common_section_flags
3434 0, // large_common_section_flags
3435 NULL, // attributes_section
3436 NULL, // attributes_vendor
3437 "_start", // entry_symbol_name
3438 32, // hash_entry_size
3442 const Target::Target_info Target_aarch64<32, false>::aarch64_info =
3445 false, // is_big_endian
3446 elfcpp::EM_AARCH64, // machine_code
3447 false, // has_make_symbol
3448 false, // has_resolve
3449 false, // has_code_fill
3450 true, // is_default_stack_executable
3451 false, // can_icf_inline_merge_sections
3453 "/lib/ld.so.1", // program interpreter
3454 0x400000, // default_text_segment_address
3455 0x10000, // abi_pagesize (overridable by -z max-page-size)
3456 0x1000, // common_pagesize (overridable by -z common-page-size)
3457 false, // isolate_execinstr
3459 elfcpp::SHN_UNDEF, // small_common_shndx
3460 elfcpp::SHN_UNDEF, // large_common_shndx
3461 0, // small_common_section_flags
3462 0, // large_common_section_flags
3463 NULL, // attributes_section
3464 NULL, // attributes_vendor
3465 "_start", // entry_symbol_name
3466 32, // hash_entry_size
3470 const Target::Target_info Target_aarch64<64, true>::aarch64_info =
3473 true, // is_big_endian
3474 elfcpp::EM_AARCH64, // machine_code
3475 false, // has_make_symbol
3476 false, // has_resolve
3477 false, // has_code_fill
3478 true, // is_default_stack_executable
3479 true, // can_icf_inline_merge_sections
3481 "/lib/ld.so.1", // program interpreter
3482 0x400000, // default_text_segment_address
3483 0x10000, // abi_pagesize (overridable by -z max-page-size)
3484 0x1000, // common_pagesize (overridable by -z common-page-size)
3485 false, // isolate_execinstr
3487 elfcpp::SHN_UNDEF, // small_common_shndx
3488 elfcpp::SHN_UNDEF, // large_common_shndx
3489 0, // small_common_section_flags
3490 0, // large_common_section_flags
3491 NULL, // attributes_section
3492 NULL, // attributes_vendor
3493 "_start", // entry_symbol_name
3494 32, // hash_entry_size
3498 const Target::Target_info Target_aarch64<32, true>::aarch64_info =
3501 true, // is_big_endian
3502 elfcpp::EM_AARCH64, // machine_code
3503 false, // has_make_symbol
3504 false, // has_resolve
3505 false, // has_code_fill
3506 true, // is_default_stack_executable
3507 false, // can_icf_inline_merge_sections
3509 "/lib/ld.so.1", // program interpreter
3510 0x400000, // default_text_segment_address
3511 0x10000, // abi_pagesize (overridable by -z max-page-size)
3512 0x1000, // common_pagesize (overridable by -z common-page-size)
3513 false, // isolate_execinstr
3515 elfcpp::SHN_UNDEF, // small_common_shndx
3516 elfcpp::SHN_UNDEF, // large_common_shndx
3517 0, // small_common_section_flags
3518 0, // large_common_section_flags
3519 NULL, // attributes_section
3520 NULL, // attributes_vendor
3521 "_start", // entry_symbol_name
3522 32, // hash_entry_size
3525 // Get the GOT section, creating it if necessary.
3527 template<int size, bool big_endian>
3528 Output_data_got_aarch64<size, big_endian>*
3529 Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab,
3532 if (this->got_ == NULL)
3534 gold_assert(symtab != NULL && layout != NULL);
3536 // When using -z now, we can treat .got.plt as a relro section.
3537 // Without -z now, it is modified after program startup by lazy
3539 bool is_got_plt_relro = parameters->options().now();
3540 Output_section_order got_order = (is_got_plt_relro
3542 : ORDER_RELRO_LAST);
3543 Output_section_order got_plt_order = (is_got_plt_relro
3545 : ORDER_NON_RELRO_FIRST);
3547 // Layout of .got and .got.plt sections.
3548 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3550 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3551 // .gotplt[1] reserved for ld.so (resolver)
3552 // .gotplt[2] reserved
3554 // Generate .got section.
3555 this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab,
3557 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
3558 (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
3559 this->got_, got_order, true);
3560 // The first word of GOT is reserved for the address of .dynamic.
3561 // We put 0 here now. The value will be replaced later in
3562 // Output_data_got_aarch64::do_write.
3563 this->got_->add_constant(0);
3565 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3566 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3567 // even if there is a .got.plt section.
3568 this->global_offset_table_ =
3569 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
3570 Symbol_table::PREDEFINED,
3572 0, 0, elfcpp::STT_OBJECT,
3574 elfcpp::STV_HIDDEN, 0,
3577 // Generate .got.plt section.
3578 this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT");
3579 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3581 | elfcpp::SHF_WRITE),
3582 this->got_plt_, got_plt_order,
3585 // The first three entries are reserved.
3586 this->got_plt_->set_current_data_size(
3587 AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
3589 // If there are any IRELATIVE relocations, they get GOT entries
3590 // in .got.plt after the jump slot entries.
3591 this->got_irelative_ = new Output_data_space(size / 8,
3592 "** GOT IRELATIVE PLT");
3593 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3595 | elfcpp::SHF_WRITE),
3596 this->got_irelative_,
3600 // If there are any TLSDESC relocations, they get GOT entries in
3601 // .got.plt after the jump slot and IRELATIVE entries.
3602 this->got_tlsdesc_ = new Output_data_got<size, big_endian>();
3603 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3605 | elfcpp::SHF_WRITE),
3610 if (!is_got_plt_relro)
3612 // Those bytes can go into the relro segment.
3613 layout->increase_relro(
3614 AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
3621 // Get the dynamic reloc section, creating it if necessary.
3623 template<int size, bool big_endian>
3624 typename Target_aarch64<size, big_endian>::Reloc_section*
3625 Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout)
3627 if (this->rela_dyn_ == NULL)
3629 gold_assert(layout != NULL);
3630 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
3631 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
3632 elfcpp::SHF_ALLOC, this->rela_dyn_,
3633 ORDER_DYNAMIC_RELOCS, false);
3635 return this->rela_dyn_;
3638 // Get the section to use for IRELATIVE relocs, creating it if
3639 // necessary. These go in .rela.dyn, but only after all other dynamic
3640 // relocations. They need to follow the other dynamic relocations so
3641 // that they can refer to global variables initialized by those
3644 template<int size, bool big_endian>
3645 typename Target_aarch64<size, big_endian>::Reloc_section*
3646 Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout)
3648 if (this->rela_irelative_ == NULL)
3650 // Make sure we have already created the dynamic reloc section.
3651 this->rela_dyn_section(layout);
3652 this->rela_irelative_ = new Reloc_section(false);
3653 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
3654 elfcpp::SHF_ALLOC, this->rela_irelative_,
3655 ORDER_DYNAMIC_RELOCS, false);
3656 gold_assert(this->rela_dyn_->output_section()
3657 == this->rela_irelative_->output_section());
3659 return this->rela_irelative_;
3663 // do_make_elf_object to override the same function in the base class. We need
3664 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3665 // store backend specific information. Hence we need to have our own ELF object
3668 template<int size, bool big_endian>
3670 Target_aarch64<size, big_endian>::do_make_elf_object(
3671 const std::string& name,
3672 Input_file* input_file,
3673 off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
3675 int et = ehdr.get_e_type();
3676 // ET_EXEC files are valid input for --just-symbols/-R,
3677 // and we treat them as relocatable objects.
3678 if (et == elfcpp::ET_EXEC && input_file->just_symbols())
3679 return Sized_target<size, big_endian>::do_make_elf_object(
3680 name, input_file, offset, ehdr);
3681 else if (et == elfcpp::ET_REL)
3683 AArch64_relobj<size, big_endian>* obj =
3684 new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr);
3688 else if (et == elfcpp::ET_DYN)
3690 // Keep base implementation.
3691 Sized_dynobj<size, big_endian>* obj =
3692 new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
3698 gold_error(_("%s: unsupported ELF file type %d"),
3705 // Scan a relocation for stub generation.
3707 template<int size, bool big_endian>
3709 Target_aarch64<size, big_endian>::scan_reloc_for_stub(
3710 const Relocate_info<size, big_endian>* relinfo,
3711 unsigned int r_type,
3712 const Sized_symbol<size>* gsym,
3714 const Symbol_value<size>* psymval,
3715 typename elfcpp::Elf_types<size>::Elf_Swxword addend,
3718 const AArch64_relobj<size, big_endian>* aarch64_relobj =
3719 static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
3721 Symbol_value<size> symval;
3724 const AArch64_reloc_property* arp = aarch64_reloc_property_table->
3725 get_reloc_property(r_type);
3726 if (gsym->use_plt_offset(arp->reference_flags()))
3728 // This uses a PLT, change the symbol value.
3729 symval.set_output_value(this->plt_section()->address()
3730 + gsym->plt_offset());
3733 else if (gsym->is_undefined())
3734 // There is no need to generate a stub symbol is undefined.
3738 // Get the symbol value.
3739 typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0);
3741 // Owing to pipelining, the PC relative branches below actually skip
3742 // two instructions when the branch offset is 0.
3743 Address destination = static_cast<Address>(-1);
3746 case elfcpp::R_AARCH64_CALL26:
3747 case elfcpp::R_AARCH64_JUMP26:
3748 destination = value + addend;
3754 int stub_type = The_reloc_stub::
3755 stub_type_for_reloc(r_type, address, destination);
3756 if (stub_type == ST_NONE)
3759 The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
3760 gold_assert(stub_table != NULL);
3762 The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend);
3763 The_reloc_stub* stub = stub_table->find_reloc_stub(key);
3766 stub = new The_reloc_stub(stub_type);
3767 stub_table->add_reloc_stub(stub, key);
3769 stub->set_destination_address(destination);
3770 } // End of Target_aarch64::scan_reloc_for_stub
3773 // This function scans a relocation section for stub generation.
3774 // The template parameter Relocate must be a class type which provides
3775 // a single function, relocate(), which implements the machine
3776 // specific part of a relocation.
3778 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3779 // SHT_REL or SHT_RELA.
3781 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3782 // of relocs. OUTPUT_SECTION is the output section.
3783 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3784 // mapped to output offsets.
3786 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3787 // VIEW_SIZE is the size. These refer to the input section, unless
3788 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3789 // the output section.
3791 template<int size, bool big_endian>
3792 template<int sh_type>
3794 Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs(
3795 const Relocate_info<size, big_endian>* relinfo,
3796 const unsigned char* prelocs,
3798 Output_section* /*output_section*/,
3799 bool /*needs_special_offset_handling*/,
3800 const unsigned char* /*view*/,
3801 Address view_address,
3804 typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype;
3806 const int reloc_size =
3807 Reloc_types<sh_type,size,big_endian>::reloc_size;
3808 AArch64_relobj<size, big_endian>* object =
3809 static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
3810 unsigned int local_count = object->local_symbol_count();
3812 gold::Default_comdat_behavior default_comdat_behavior;
3813 Comdat_behavior comdat_behavior = CB_UNDETERMINED;
3815 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
3817 Reltype reloc(prelocs);
3818 typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
3819 unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
3820 unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
3821 if (r_type != elfcpp::R_AARCH64_CALL26
3822 && r_type != elfcpp::R_AARCH64_JUMP26)
3825 section_offset_type offset =
3826 convert_to_section_size_type(reloc.get_r_offset());
3829 typename elfcpp::Elf_types<size>::Elf_Swxword addend =
3830 reloc.get_r_addend();
3832 const Sized_symbol<size>* sym;
3833 Symbol_value<size> symval;
3834 const Symbol_value<size> *psymval;
3835 bool is_defined_in_discarded_section;
3837 if (r_sym < local_count)
3840 psymval = object->local_symbol(r_sym);
3842 // If the local symbol belongs to a section we are discarding,
3843 // and that section is a debug section, try to find the
3844 // corresponding kept section and map this symbol to its
3845 // counterpart in the kept section. The symbol must not
3846 // correspond to a section we are folding.
3848 shndx = psymval->input_shndx(&is_ordinary);
3849 is_defined_in_discarded_section =
3851 && shndx != elfcpp::SHN_UNDEF
3852 && !object->is_section_included(shndx)
3853 && !relinfo->symtab->is_section_folded(object, shndx));
3855 // We need to compute the would-be final value of this local
3857 if (!is_defined_in_discarded_section)
3859 typedef Sized_relobj_file<size, big_endian> ObjType;
3860 typename ObjType::Compute_final_local_value_status status =
3861 object->compute_final_local_value(r_sym, psymval, &symval,
3863 if (status == ObjType::CFLV_OK)
3865 // Currently we cannot handle a branch to a target in
3866 // a merged section. If this is the case, issue an error
3867 // and also free the merge symbol value.
3868 if (!symval.has_output_value())
3870 const std::string& section_name =
3871 object->section_name(shndx);
3872 object->error(_("cannot handle branch to local %u "
3873 "in a merged section %s"),
3874 r_sym, section_name.c_str());
3880 // We cannot determine the final value.
3888 gsym = object->global_symbol(r_sym);
3889 gold_assert(gsym != NULL);
3890 if (gsym->is_forwarder())
3891 gsym = relinfo->symtab->resolve_forwards(gsym);
3893 sym = static_cast<const Sized_symbol<size>*>(gsym);
3894 if (sym->has_symtab_index() && sym->symtab_index() != -1U)
3895 symval.set_output_symtab_index(sym->symtab_index());
3897 symval.set_no_output_symtab_entry();
3899 // We need to compute the would-be final value of this global
3901 const Symbol_table* symtab = relinfo->symtab;
3902 const Sized_symbol<size>* sized_symbol =
3903 symtab->get_sized_symbol<size>(gsym);
3904 Symbol_table::Compute_final_value_status status;
3905 typename elfcpp::Elf_types<size>::Elf_Addr value =
3906 symtab->compute_final_value<size>(sized_symbol, &status);
3908 // Skip this if the symbol has not output section.
3909 if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION)
3911 symval.set_output_value(value);
3913 if (gsym->type() == elfcpp::STT_TLS)
3914 symval.set_is_tls_symbol();
3915 else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
3916 symval.set_is_ifunc_symbol();
3919 is_defined_in_discarded_section =
3920 (gsym->is_defined_in_discarded_section()
3921 && gsym->is_undefined());
3925 Symbol_value<size> symval2;
3926 if (is_defined_in_discarded_section)
3928 if (comdat_behavior == CB_UNDETERMINED)
3930 std::string name = object->section_name(relinfo->data_shndx);
3931 comdat_behavior = default_comdat_behavior.get(name.c_str());
3933 if (comdat_behavior == CB_PRETEND)
3936 typename elfcpp::Elf_types<size>::Elf_Addr value =
3937 object->map_to_kept_section(shndx, &found);
3939 symval2.set_output_value(value + psymval->input_value());
3941 symval2.set_output_value(0);
3945 if (comdat_behavior == CB_WARNING)
3946 gold_warning_at_location(relinfo, i, offset,
3947 _("relocation refers to discarded "
3949 symval2.set_output_value(0);
3951 symval2.set_no_output_symtab_entry();
3955 // If symbol is a section symbol, we don't know the actual type of
3956 // destination. Give up.
3957 if (psymval->is_section_symbol())
3960 this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval,
3961 addend, view_address + offset);
3962 } // End of iterating relocs in a section
3963 } // End of Target_aarch64::scan_reloc_section_for_stubs
3966 // Scan an input section for stub generation.
3968 template<int size, bool big_endian>
3970 Target_aarch64<size, big_endian>::scan_section_for_stubs(
3971 const Relocate_info<size, big_endian>* relinfo,
3972 unsigned int sh_type,
3973 const unsigned char* prelocs,
3975 Output_section* output_section,
3976 bool needs_special_offset_handling,
3977 const unsigned char* view,
3978 Address view_address,
3979 section_size_type view_size)
3981 gold_assert(sh_type == elfcpp::SHT_RELA);
3982 this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>(
3987 needs_special_offset_handling,
3994 // Relocate a single stub.
3996 template<int size, bool big_endian>
3997 void Target_aarch64<size, big_endian>::
3998 relocate_stub(The_reloc_stub* stub,
3999 const The_relocate_info*,
4001 unsigned char* view,
4005 typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions;
4006 typedef typename The_reloc_functions::Status The_reloc_functions_status;
4007 typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
4009 Insntype* ip = reinterpret_cast<Insntype*>(view);
4010 int insn_number = stub->insn_num();
4011 const uint32_t* insns = stub->insns();
4012 // Check the insns are really those stub insns.
4013 for (int i = 0; i < insn_number; ++i)
4015 Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i);
4016 gold_assert(((uint32_t)insn == insns[i]));
4019 Address dest = stub->destination_address();
4021 switch(stub->type())
4023 case ST_ADRP_BRANCH:
4025 // 1st reloc is ADR_PREL_PG_HI21
4026 The_reloc_functions_status status =
4027 The_reloc_functions::adrp(view, dest, address);
4028 // An error should never arise in the above step. If so, please
4029 // check 'aarch64_valid_for_adrp_p'.
4030 gold_assert(status == The_reloc_functions::STATUS_OKAY);
4032 // 2nd reloc is ADD_ABS_LO12_NC
4033 const AArch64_reloc_property* arp =
4034 aarch64_reloc_property_table->get_reloc_property(
4035 elfcpp::R_AARCH64_ADD_ABS_LO12_NC);
4036 gold_assert(arp != NULL);
4037 status = The_reloc_functions::template
4038 rela_general<32>(view + 4, dest, 0, arp);
4039 // An error should never arise, it is an "_NC" relocation.
4040 gold_assert(status == The_reloc_functions::STATUS_OKAY);
4044 case ST_LONG_BRANCH_ABS:
4045 // 1st reloc is R_AARCH64_PREL64, at offset 8
4046 elfcpp::Swap<64,big_endian>::writeval(view + 8, dest);
4049 case ST_LONG_BRANCH_PCREL:
4051 // "PC" calculation is the 2nd insn in the stub.
4052 uint64_t offset = dest - (address + 4);
4053 // Offset is placed at offset 4 and 5.
4054 elfcpp::Swap<64,big_endian>::writeval(view + 16, offset);
4064 // A class to handle the PLT data.
4065 // This is an abstract base class that handles most of the linker details
4066 // but does not know the actual contents of PLT entries. The derived
4067 // classes below fill in those details.
4069 template<int size, bool big_endian>
4070 class Output_data_plt_aarch64 : public Output_section_data
4073 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
4075 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4077 Output_data_plt_aarch64(Layout* layout,
4079 Output_data_got_aarch64<size, big_endian>* got,
4080 Output_data_space* got_plt,
4081 Output_data_space* got_irelative)
4082 : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL),
4083 got_(got), got_plt_(got_plt), got_irelative_(got_irelative),
4084 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4085 { this->init(layout); }
4087 // Initialize the PLT section.
4089 init(Layout* layout);
4091 // Add an entry to the PLT.
4093 add_entry(Symbol_table*, Layout*, Symbol* gsym);
4095 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4097 add_local_ifunc_entry(Symbol_table* symtab, Layout*,
4098 Sized_relobj_file<size, big_endian>* relobj,
4099 unsigned int local_sym_index);
4101 // Add the relocation for a PLT entry.
4103 add_relocation(Symbol_table*, Layout*, Symbol* gsym,
4104 unsigned int got_offset);
4106 // Add the reserved TLSDESC_PLT entry to the PLT.
4108 reserve_tlsdesc_entry(unsigned int got_offset)
4109 { this->tlsdesc_got_offset_ = got_offset; }
4111 // Return true if a TLSDESC_PLT entry has been reserved.
4113 has_tlsdesc_entry() const
4114 { return this->tlsdesc_got_offset_ != -1U; }
4116 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4118 get_tlsdesc_got_offset() const
4119 { return this->tlsdesc_got_offset_; }
4121 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4123 get_tlsdesc_plt_offset() const
4125 return (this->first_plt_entry_offset() +
4126 (this->count_ + this->irelative_count_)
4127 * this->get_plt_entry_size());
4130 // Return the .rela.plt section data.
4133 { return this->rel_; }
4135 // Return where the TLSDESC relocations should go.
4137 rela_tlsdesc(Layout*);
4139 // Return where the IRELATIVE relocations should go in the PLT
4142 rela_irelative(Symbol_table*, Layout*);
4144 // Return whether we created a section for IRELATIVE relocations.
4146 has_irelative_section() const
4147 { return this->irelative_rel_ != NULL; }
4149 // Return the number of PLT entries.
4152 { return this->count_ + this->irelative_count_; }
4154 // Return the offset of the first non-reserved PLT entry.
4156 first_plt_entry_offset() const
4157 { return this->do_first_plt_entry_offset(); }
4159 // Return the size of a PLT entry.
4161 get_plt_entry_size() const
4162 { return this->do_get_plt_entry_size(); }
4164 // Return the reserved tlsdesc entry size.
4166 get_plt_tlsdesc_entry_size() const
4167 { return this->do_get_plt_tlsdesc_entry_size(); }
4169 // Return the PLT address to use for a global symbol.
4171 address_for_global(const Symbol*);
4173 // Return the PLT address to use for a local symbol.
4175 address_for_local(const Relobj*, unsigned int symndx);
4178 // Fill in the first PLT entry.
4180 fill_first_plt_entry(unsigned char* pov,
4181 Address got_address,
4182 Address plt_address)
4183 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
4185 // Fill in a normal PLT entry.
4187 fill_plt_entry(unsigned char* pov,
4188 Address got_address,
4189 Address plt_address,
4190 unsigned int got_offset,
4191 unsigned int plt_offset)
4193 this->do_fill_plt_entry(pov, got_address, plt_address,
4194 got_offset, plt_offset);
4197 // Fill in the reserved TLSDESC PLT entry.
4199 fill_tlsdesc_entry(unsigned char* pov,
4200 Address gotplt_address,
4201 Address plt_address,
4203 unsigned int tlsdesc_got_offset,
4204 unsigned int plt_offset)
4206 this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
4207 tlsdesc_got_offset, plt_offset);
4210 virtual unsigned int
4211 do_first_plt_entry_offset() const = 0;
4213 virtual unsigned int
4214 do_get_plt_entry_size() const = 0;
4216 virtual unsigned int
4217 do_get_plt_tlsdesc_entry_size() const = 0;
4220 do_fill_first_plt_entry(unsigned char* pov,
4222 Address plt_addr) = 0;
4225 do_fill_plt_entry(unsigned char* pov,
4226 Address got_address,
4227 Address plt_address,
4228 unsigned int got_offset,
4229 unsigned int plt_offset) = 0;
4232 do_fill_tlsdesc_entry(unsigned char* pov,
4233 Address gotplt_address,
4234 Address plt_address,
4236 unsigned int tlsdesc_got_offset,
4237 unsigned int plt_offset) = 0;
4240 do_adjust_output_section(Output_section* os);
4242 // Write to a map file.
4244 do_print_to_mapfile(Mapfile* mapfile) const
4245 { mapfile->print_output_data(this, _("** PLT")); }
4248 // Set the final size.
4250 set_final_data_size();
4252 // Write out the PLT data.
4254 do_write(Output_file*);
4256 // The reloc section.
4257 Reloc_section* rel_;
4259 // The TLSDESC relocs, if necessary. These must follow the regular
4261 Reloc_section* tlsdesc_rel_;
4263 // The IRELATIVE relocs, if necessary. These must follow the
4264 // regular PLT relocations.
4265 Reloc_section* irelative_rel_;
4267 // The .got section.
4268 Output_data_got_aarch64<size, big_endian>* got_;
4270 // The .got.plt section.
4271 Output_data_space* got_plt_;
4273 // The part of the .got.plt section used for IRELATIVE relocs.
4274 Output_data_space* got_irelative_;
4276 // The number of PLT entries.
4277 unsigned int count_;
4279 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4280 // follow the regular PLT entries.
4281 unsigned int irelative_count_;
4283 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4284 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4285 // indicates an offset is not allocated.
4286 unsigned int tlsdesc_got_offset_;
4289 // Initialize the PLT section.
4291 template<int size, bool big_endian>
4293 Output_data_plt_aarch64<size, big_endian>::init(Layout* layout)
4295 this->rel_ = new Reloc_section(false);
4296 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4297 elfcpp::SHF_ALLOC, this->rel_,
4298 ORDER_DYNAMIC_PLT_RELOCS, false);
4301 template<int size, bool big_endian>
4303 Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section(
4306 os->set_entsize(this->get_plt_entry_size());
4309 // Add an entry to the PLT.
4311 template<int size, bool big_endian>
4313 Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab,
4314 Layout* layout, Symbol* gsym)
4316 gold_assert(!gsym->has_plt_offset());
4318 unsigned int* pcount;
4319 unsigned int plt_reserved;
4320 Output_section_data_build* got;
4322 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4323 && gsym->can_use_relative_reloc(false))
4325 pcount = &this->irelative_count_;
4327 got = this->got_irelative_;
4331 pcount = &this->count_;
4332 plt_reserved = this->first_plt_entry_offset();
4333 got = this->got_plt_;
4336 gsym->set_plt_offset((*pcount) * this->get_plt_entry_size()
4341 section_offset_type got_offset = got->current_data_size();
4343 // Every PLT entry needs a GOT entry which points back to the PLT
4344 // entry (this will be changed by the dynamic linker, normally
4345 // lazily when the function is called).
4346 got->set_current_data_size(got_offset + size / 8);
4348 // Every PLT entry needs a reloc.
4349 this->add_relocation(symtab, layout, gsym, got_offset);
4351 // Note that we don't need to save the symbol. The contents of the
4352 // PLT are independent of which symbols are used. The symbols only
4353 // appear in the relocations.
4356 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4359 template<int size, bool big_endian>
4361 Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry(
4362 Symbol_table* symtab,
4364 Sized_relobj_file<size, big_endian>* relobj,
4365 unsigned int local_sym_index)
4367 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
4368 ++this->irelative_count_;
4370 section_offset_type got_offset = this->got_irelative_->current_data_size();
4372 // Every PLT entry needs a GOT entry which points back to the PLT
4374 this->got_irelative_->set_current_data_size(got_offset + size / 8);
4376 // Every PLT entry needs a reloc.
4377 Reloc_section* rela = this->rela_irelative(symtab, layout);
4378 rela->add_symbolless_local_addend(relobj, local_sym_index,
4379 elfcpp::R_AARCH64_IRELATIVE,
4380 this->got_irelative_, got_offset, 0);
4385 // Add the relocation for a PLT entry.
4387 template<int size, bool big_endian>
4389 Output_data_plt_aarch64<size, big_endian>::add_relocation(
4390 Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset)
4392 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4393 && gsym->can_use_relative_reloc(false))
4395 Reloc_section* rela = this->rela_irelative(symtab, layout);
4396 rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE,
4397 this->got_irelative_, got_offset, 0);
4401 gsym->set_needs_dynsym_entry();
4402 this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_,
4407 // Return where the TLSDESC relocations should go, creating it if
4408 // necessary. These follow the JUMP_SLOT relocations.
4410 template<int size, bool big_endian>
4411 typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
4412 Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout)
4414 if (this->tlsdesc_rel_ == NULL)
4416 this->tlsdesc_rel_ = new Reloc_section(false);
4417 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4418 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
4419 ORDER_DYNAMIC_PLT_RELOCS, false);
4420 gold_assert(this->tlsdesc_rel_->output_section()
4421 == this->rel_->output_section());
4423 return this->tlsdesc_rel_;
4426 // Return where the IRELATIVE relocations should go in the PLT. These
4427 // follow the JUMP_SLOT and the TLSDESC relocations.
4429 template<int size, bool big_endian>
4430 typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
4431 Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab,
4434 if (this->irelative_rel_ == NULL)
4436 // Make sure we have a place for the TLSDESC relocations, in
4437 // case we see any later on.
4438 this->rela_tlsdesc(layout);
4439 this->irelative_rel_ = new Reloc_section(false);
4440 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4441 elfcpp::SHF_ALLOC, this->irelative_rel_,
4442 ORDER_DYNAMIC_PLT_RELOCS, false);
4443 gold_assert(this->irelative_rel_->output_section()
4444 == this->rel_->output_section());
4446 if (parameters->doing_static_link())
4448 // A statically linked executable will only have a .rela.plt
4449 // section to hold R_AARCH64_IRELATIVE relocs for
4450 // STT_GNU_IFUNC symbols. The library will use these
4451 // symbols to locate the IRELATIVE relocs at program startup
4453 symtab->define_in_output_data("__rela_iplt_start", NULL,
4454 Symbol_table::PREDEFINED,
4455 this->irelative_rel_, 0, 0,
4456 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
4457 elfcpp::STV_HIDDEN, 0, false, true);
4458 symtab->define_in_output_data("__rela_iplt_end", NULL,
4459 Symbol_table::PREDEFINED,
4460 this->irelative_rel_, 0, 0,
4461 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
4462 elfcpp::STV_HIDDEN, 0, true, true);
4465 return this->irelative_rel_;
4468 // Return the PLT address to use for a global symbol.
4470 template<int size, bool big_endian>
4472 Output_data_plt_aarch64<size, big_endian>::address_for_global(
4475 uint64_t offset = 0;
4476 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4477 && gsym->can_use_relative_reloc(false))
4478 offset = (this->first_plt_entry_offset() +
4479 this->count_ * this->get_plt_entry_size());
4480 return this->address() + offset + gsym->plt_offset();
4483 // Return the PLT address to use for a local symbol. These are always
4484 // IRELATIVE relocs.
4486 template<int size, bool big_endian>
4488 Output_data_plt_aarch64<size, big_endian>::address_for_local(
4489 const Relobj* object,
4492 return (this->address()
4493 + this->first_plt_entry_offset()
4494 + this->count_ * this->get_plt_entry_size()
4495 + object->local_plt_offset(r_sym));
4498 // Set the final size.
4500 template<int size, bool big_endian>
4502 Output_data_plt_aarch64<size, big_endian>::set_final_data_size()
4504 unsigned int count = this->count_ + this->irelative_count_;
4505 unsigned int extra_size = 0;
4506 if (this->has_tlsdesc_entry())
4507 extra_size += this->get_plt_tlsdesc_entry_size();
4508 this->set_data_size(this->first_plt_entry_offset()
4509 + count * this->get_plt_entry_size()
4513 template<int size, bool big_endian>
4514 class Output_data_plt_aarch64_standard :
4515 public Output_data_plt_aarch64<size, big_endian>
4518 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4519 Output_data_plt_aarch64_standard(
4521 Output_data_got_aarch64<size, big_endian>* got,
4522 Output_data_space* got_plt,
4523 Output_data_space* got_irelative)
4524 : Output_data_plt_aarch64<size, big_endian>(layout,
4531 // Return the offset of the first non-reserved PLT entry.
4532 virtual unsigned int
4533 do_first_plt_entry_offset() const
4534 { return this->first_plt_entry_size; }
4536 // Return the size of a PLT entry
4537 virtual unsigned int
4538 do_get_plt_entry_size() const
4539 { return this->plt_entry_size; }
4541 // Return the size of a tlsdesc entry
4542 virtual unsigned int
4543 do_get_plt_tlsdesc_entry_size() const
4544 { return this->plt_tlsdesc_entry_size; }
4547 do_fill_first_plt_entry(unsigned char* pov,
4548 Address got_address,
4549 Address plt_address);
4552 do_fill_plt_entry(unsigned char* pov,
4553 Address got_address,
4554 Address plt_address,
4555 unsigned int got_offset,
4556 unsigned int plt_offset);
4559 do_fill_tlsdesc_entry(unsigned char* pov,
4560 Address gotplt_address,
4561 Address plt_address,
4563 unsigned int tlsdesc_got_offset,
4564 unsigned int plt_offset);
4567 // The size of the first plt entry size.
4568 static const int first_plt_entry_size = 32;
4569 // The size of the plt entry size.
4570 static const int plt_entry_size = 16;
4571 // The size of the plt tlsdesc entry size.
4572 static const int plt_tlsdesc_entry_size = 32;
4573 // Template for the first PLT entry.
4574 static const uint32_t first_plt_entry[first_plt_entry_size / 4];
4575 // Template for subsequent PLT entries.
4576 static const uint32_t plt_entry[plt_entry_size / 4];
4577 // The reserved TLSDESC entry in the PLT for an executable.
4578 static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4];
4581 // The first entry in the PLT for an executable.
4585 Output_data_plt_aarch64_standard<32, false>::
4586 first_plt_entry[first_plt_entry_size / 4] =
4588 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4589 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4590 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4591 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4592 0xd61f0220, /* br x17 */
4593 0xd503201f, /* nop */
4594 0xd503201f, /* nop */
4595 0xd503201f, /* nop */
4601 Output_data_plt_aarch64_standard<32, true>::
4602 first_plt_entry[first_plt_entry_size / 4] =
4604 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4605 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4606 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4607 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4608 0xd61f0220, /* br x17 */
4609 0xd503201f, /* nop */
4610 0xd503201f, /* nop */
4611 0xd503201f, /* nop */
4617 Output_data_plt_aarch64_standard<64, false>::
4618 first_plt_entry[first_plt_entry_size / 4] =
4620 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4621 0x90000010, /* adrp x16, PLT_GOT+16 */
4622 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4623 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4624 0xd61f0220, /* br x17 */
4625 0xd503201f, /* nop */
4626 0xd503201f, /* nop */
4627 0xd503201f, /* nop */
4633 Output_data_plt_aarch64_standard<64, true>::
4634 first_plt_entry[first_plt_entry_size / 4] =
4636 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4637 0x90000010, /* adrp x16, PLT_GOT+16 */
4638 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4639 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4640 0xd61f0220, /* br x17 */
4641 0xd503201f, /* nop */
4642 0xd503201f, /* nop */
4643 0xd503201f, /* nop */
4649 Output_data_plt_aarch64_standard<32, false>::
4650 plt_entry[plt_entry_size / 4] =
4652 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4653 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4654 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4655 0xd61f0220, /* br x17. */
4661 Output_data_plt_aarch64_standard<32, true>::
4662 plt_entry[plt_entry_size / 4] =
4664 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4665 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4666 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4667 0xd61f0220, /* br x17. */
4673 Output_data_plt_aarch64_standard<64, false>::
4674 plt_entry[plt_entry_size / 4] =
4676 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4677 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4678 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4679 0xd61f0220, /* br x17. */
4685 Output_data_plt_aarch64_standard<64, true>::
4686 plt_entry[plt_entry_size / 4] =
4688 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4689 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4690 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4691 0xd61f0220, /* br x17. */
4695 template<int size, bool big_endian>
4697 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry(
4699 Address got_address,
4700 Address plt_address)
4702 // PLT0 of the small PLT looks like this in ELF64 -
4703 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4704 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4705 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4707 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4708 // GOTPLT entry for this.
4710 // PLT0 will be slightly different in ELF32 due to different got entry
4712 memcpy(pov, this->first_plt_entry, this->first_plt_entry_size);
4713 Address gotplt_2nd_ent = got_address + (size / 8) * 2;
4715 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4716 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4717 // FIXME: This only works for 64bit
4718 AArch64_relocate_functions<size, big_endian>::adrp(pov + 4,
4719 gotplt_2nd_ent, plt_address + 4);
4721 // Fill in R_AARCH64_LDST8_LO12
4722 elfcpp::Swap<32, big_endian>::writeval(
4724 ((this->first_plt_entry[2] & 0xffc003ff)
4725 | ((gotplt_2nd_ent & 0xff8) << 7)));
4727 // Fill in R_AARCH64_ADD_ABS_LO12
4728 elfcpp::Swap<32, big_endian>::writeval(
4730 ((this->first_plt_entry[3] & 0xffc003ff)
4731 | ((gotplt_2nd_ent & 0xfff) << 10)));
4735 // Subsequent entries in the PLT for an executable.
4736 // FIXME: This only works for 64bit
4738 template<int size, bool big_endian>
4740 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry(
4742 Address got_address,
4743 Address plt_address,
4744 unsigned int got_offset,
4745 unsigned int plt_offset)
4747 memcpy(pov, this->plt_entry, this->plt_entry_size);
4749 Address gotplt_entry_address = got_address + got_offset;
4750 Address plt_entry_address = plt_address + plt_offset;
4752 // Fill in R_AARCH64_PCREL_ADR_HI21
4753 AArch64_relocate_functions<size, big_endian>::adrp(
4755 gotplt_entry_address,
4758 // Fill in R_AARCH64_LDST64_ABS_LO12
4759 elfcpp::Swap<32, big_endian>::writeval(
4761 ((this->plt_entry[1] & 0xffc003ff)
4762 | ((gotplt_entry_address & 0xff8) << 7)));
4764 // Fill in R_AARCH64_ADD_ABS_LO12
4765 elfcpp::Swap<32, big_endian>::writeval(
4767 ((this->plt_entry[2] & 0xffc003ff)
4768 | ((gotplt_entry_address & 0xfff) <<10)));
4775 Output_data_plt_aarch64_standard<32, false>::
4776 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4778 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4779 0x90000002, /* adrp x2, 0 */
4780 0x90000003, /* adrp x3, 0 */
4781 0xb9400042, /* ldr w2, [w2, #0] */
4782 0x11000063, /* add w3, w3, 0 */
4783 0xd61f0040, /* br x2 */
4784 0xd503201f, /* nop */
4785 0xd503201f, /* nop */
4790 Output_data_plt_aarch64_standard<32, true>::
4791 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4793 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4794 0x90000002, /* adrp x2, 0 */
4795 0x90000003, /* adrp x3, 0 */
4796 0xb9400042, /* ldr w2, [w2, #0] */
4797 0x11000063, /* add w3, w3, 0 */
4798 0xd61f0040, /* br x2 */
4799 0xd503201f, /* nop */
4800 0xd503201f, /* nop */
4805 Output_data_plt_aarch64_standard<64, false>::
4806 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4808 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4809 0x90000002, /* adrp x2, 0 */
4810 0x90000003, /* adrp x3, 0 */
4811 0xf9400042, /* ldr x2, [x2, #0] */
4812 0x91000063, /* add x3, x3, 0 */
4813 0xd61f0040, /* br x2 */
4814 0xd503201f, /* nop */
4815 0xd503201f, /* nop */
4820 Output_data_plt_aarch64_standard<64, true>::
4821 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4823 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4824 0x90000002, /* adrp x2, 0 */
4825 0x90000003, /* adrp x3, 0 */
4826 0xf9400042, /* ldr x2, [x2, #0] */
4827 0x91000063, /* add x3, x3, 0 */
4828 0xd61f0040, /* br x2 */
4829 0xd503201f, /* nop */
4830 0xd503201f, /* nop */
4833 template<int size, bool big_endian>
4835 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry(
4837 Address gotplt_address,
4838 Address plt_address,
4840 unsigned int tlsdesc_got_offset,
4841 unsigned int plt_offset)
4843 memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size);
4845 // move DT_TLSDESC_GOT address into x2
4846 // move .got.plt address into x3
4847 Address tlsdesc_got_entry = got_base + tlsdesc_got_offset;
4848 Address plt_entry_address = plt_address + plt_offset;
4850 // R_AARCH64_ADR_PREL_PG_HI21
4851 AArch64_relocate_functions<size, big_endian>::adrp(
4854 plt_entry_address + 4);
4856 // R_AARCH64_ADR_PREL_PG_HI21
4857 AArch64_relocate_functions<size, big_endian>::adrp(
4860 plt_entry_address + 8);
4862 // R_AARCH64_LDST64_ABS_LO12
4863 elfcpp::Swap<32, big_endian>::writeval(
4865 ((this->tlsdesc_plt_entry[3] & 0xffc003ff)
4866 | ((tlsdesc_got_entry & 0xff8) << 7)));
4868 // R_AARCH64_ADD_ABS_LO12
4869 elfcpp::Swap<32, big_endian>::writeval(
4871 ((this->tlsdesc_plt_entry[4] & 0xffc003ff)
4872 | ((gotplt_address & 0xfff) << 10)));
4875 // Write out the PLT. This uses the hand-coded instructions above,
4876 // and adjusts them as needed. This is specified by the AMD64 ABI.
4878 template<int size, bool big_endian>
4880 Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of)
4882 const off_t offset = this->offset();
4883 const section_size_type oview_size =
4884 convert_to_section_size_type(this->data_size());
4885 unsigned char* const oview = of->get_output_view(offset, oview_size);
4887 const off_t got_file_offset = this->got_plt_->offset();
4888 gold_assert(got_file_offset + this->got_plt_->data_size()
4889 == this->got_irelative_->offset());
4891 const section_size_type got_size =
4892 convert_to_section_size_type(this->got_plt_->data_size()
4893 + this->got_irelative_->data_size());
4894 unsigned char* const got_view = of->get_output_view(got_file_offset,
4897 unsigned char* pov = oview;
4899 // The base address of the .plt section.
4900 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
4901 // The base address of the PLT portion of the .got section.
4902 typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address
4903 = this->got_plt_->address();
4905 this->fill_first_plt_entry(pov, gotplt_address, plt_address);
4906 pov += this->first_plt_entry_offset();
4908 // The first three entries in .got.plt are reserved.
4909 unsigned char* got_pov = got_view;
4910 memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT);
4911 got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
4913 unsigned int plt_offset = this->first_plt_entry_offset();
4914 unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
4915 const unsigned int count = this->count_ + this->irelative_count_;
4916 for (unsigned int plt_index = 0;
4919 pov += this->get_plt_entry_size(),
4920 got_pov += size / 8,
4921 plt_offset += this->get_plt_entry_size(),
4922 got_offset += size / 8)
4924 // Set and adjust the PLT entry itself.
4925 this->fill_plt_entry(pov, gotplt_address, plt_address,
4926 got_offset, plt_offset);
4928 // Set the entry in the GOT, which points to plt0.
4929 elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address);
4932 if (this->has_tlsdesc_entry())
4934 // Set and adjust the reserved TLSDESC PLT entry.
4935 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
4936 // The base address of the .base section.
4937 typename elfcpp::Elf_types<size>::Elf_Addr got_base =
4938 this->got_->address();
4939 this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
4940 tlsdesc_got_offset, plt_offset);
4941 pov += this->get_plt_tlsdesc_entry_size();
4944 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
4945 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
4947 of->write_output_view(offset, oview_size, oview);
4948 of->write_output_view(got_file_offset, got_size, got_view);
4951 // Telling how to update the immediate field of an instruction.
4952 struct AArch64_howto
4954 // The immediate field mask.
4955 elfcpp::Elf_Xword dst_mask;
4957 // The offset to apply relocation immediate
4960 // The second part offset, if the immediate field has two parts.
4961 // -1 if the immediate field has only one part.
4965 static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] =
4967 {0, -1, -1}, // DATA
4968 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
4969 {0xffffe0, 5, -1}, // LD [23:5]-imm19
4970 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
4971 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
4972 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
4973 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
4974 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
4975 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
4976 {0x3ffffff, 0, -1}, // B [25:0]-imm26
4977 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
4980 // AArch64 relocate function class
4982 template<int size, bool big_endian>
4983 class AArch64_relocate_functions
4988 STATUS_OKAY, // No error during relocation.
4989 STATUS_OVERFLOW, // Relocation overflow.
4990 STATUS_BAD_RELOC, // Relocation cannot be applied.
4993 typedef AArch64_relocate_functions<size, big_endian> This;
4994 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4995 typedef Relocate_info<size, big_endian> The_relocate_info;
4996 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
4997 typedef Reloc_stub<size, big_endian> The_reloc_stub;
4998 typedef Stub_table<size, big_endian> The_stub_table;
4999 typedef elfcpp::Rela<size, big_endian> The_rela;
5000 typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype;
5002 // Return the page address of the address.
5003 // Page(address) = address & ~0xFFF
5005 static inline AArch64_valtype
5006 Page(Address address)
5008 return (address & (~static_cast<Address>(0xFFF)));
5012 // Update instruction (pointed by view) with selected bits (immed).
5013 // val = (val & ~dst_mask) | (immed << doffset)
5015 template<int valsize>
5017 update_view(unsigned char* view,
5018 AArch64_valtype immed,
5019 elfcpp::Elf_Xword doffset,
5020 elfcpp::Elf_Xword dst_mask)
5022 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5023 Valtype* wv = reinterpret_cast<Valtype*>(view);
5024 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
5026 // Clear immediate fields.
5028 elfcpp::Swap<valsize, big_endian>::writeval(wv,
5029 static_cast<Valtype>(val | (immed << doffset)));
5032 // Update two parts of an instruction (pointed by view) with selected
5033 // bits (immed1 and immed2).
5034 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5036 template<int valsize>
5038 update_view_two_parts(
5039 unsigned char* view,
5040 AArch64_valtype immed1,
5041 AArch64_valtype immed2,
5042 elfcpp::Elf_Xword doffset1,
5043 elfcpp::Elf_Xword doffset2,
5044 elfcpp::Elf_Xword dst_mask)
5046 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5047 Valtype* wv = reinterpret_cast<Valtype*>(view);
5048 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
5050 elfcpp::Swap<valsize, big_endian>::writeval(wv,
5051 static_cast<Valtype>(val | (immed1 << doffset1) |
5052 (immed2 << doffset2)));
5055 // Update adr or adrp instruction with immed.
5056 // In adr and adrp: [30:29] immlo [23:5] immhi
5059 update_adr(unsigned char* view, AArch64_valtype immed)
5061 elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5);
5062 This::template update_view_two_parts<32>(
5065 (immed & 0x1ffffc) >> 2,
5071 // Update movz/movn instruction with bits immed.
5072 // Set instruction to movz if is_movz is true, otherwise set instruction
5076 update_movnz(unsigned char* view,
5077 AArch64_valtype immed,
5080 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
5081 Valtype* wv = reinterpret_cast<Valtype*>(view);
5082 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
5084 const elfcpp::Elf_Xword doffset =
5085 aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset;
5086 const elfcpp::Elf_Xword dst_mask =
5087 aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask;
5089 // Clear immediate fields and opc code.
5090 val &= ~(dst_mask | (0x3 << 29));
5092 // Set instruction to movz or movn.
5093 // movz: [30:29] is 10 movn: [30:29] is 00
5097 elfcpp::Swap<32, big_endian>::writeval(wv,
5098 static_cast<Valtype>(val | (immed << doffset)));
5101 // Update selected bits in text.
5103 template<int valsize>
5104 static inline typename This::Status
5105 reloc_common(unsigned char* view, Address x,
5106 const AArch64_reloc_property* reloc_property)
5108 // Select bits from X.
5109 Address immed = reloc_property->select_x_value(x);
5112 const AArch64_reloc_property::Reloc_inst inst =
5113 reloc_property->reloc_inst();
5114 // If it is a data relocation or instruction has 2 parts of immediate
5115 // fields, you should not call pcrela_general.
5116 gold_assert(aarch64_howto[inst].doffset2 == -1 &&
5117 aarch64_howto[inst].doffset != -1);
5118 This::template update_view<valsize>(view, immed,
5119 aarch64_howto[inst].doffset,
5120 aarch64_howto[inst].dst_mask);
5122 // Do check overflow or alignment if needed.
5123 return (reloc_property->checkup_x_value(x)
5125 : This::STATUS_OVERFLOW);
5130 // Construct a B insn. Note, although we group it here with other relocation
5131 // operation, there is actually no 'relocation' involved here.
5133 construct_b(unsigned char* view, unsigned int branch_offset)
5135 update_view_two_parts<32>(view, 0x05, (branch_offset >> 2),
5139 // Do a simple rela relocation at unaligned addresses.
5141 template<int valsize>
5142 static inline typename This::Status
5143 rela_ua(unsigned char* view,
5144 const Sized_relobj_file<size, big_endian>* object,
5145 const Symbol_value<size>* psymval,
5146 AArch64_valtype addend,
5147 const AArch64_reloc_property* reloc_property)
5149 typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
5151 typename elfcpp::Elf_types<size>::Elf_Addr x =
5152 psymval->value(object, addend);
5153 elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
5154 static_cast<Valtype>(x));
5155 return (reloc_property->checkup_x_value(x)
5157 : This::STATUS_OVERFLOW);
5160 // Do a simple pc-relative relocation at unaligned addresses.
5162 template<int valsize>
5163 static inline typename This::Status
5164 pcrela_ua(unsigned char* view,
5165 const Sized_relobj_file<size, big_endian>* object,
5166 const Symbol_value<size>* psymval,
5167 AArch64_valtype addend,
5169 const AArch64_reloc_property* reloc_property)
5171 typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
5173 Address x = psymval->value(object, addend) - address;
5174 elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
5175 static_cast<Valtype>(x));
5176 return (reloc_property->checkup_x_value(x)
5178 : This::STATUS_OVERFLOW);
5181 // Do a simple rela relocation at aligned addresses.
5183 template<int valsize>
5184 static inline typename This::Status
5186 unsigned char* view,
5187 const Sized_relobj_file<size, big_endian>* object,
5188 const Symbol_value<size>* psymval,
5189 AArch64_valtype addend,
5190 const AArch64_reloc_property* reloc_property)
5192 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5193 Valtype* wv = reinterpret_cast<Valtype*>(view);
5194 Address x = psymval->value(object, addend);
5195 elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x));
5196 return (reloc_property->checkup_x_value(x)
5198 : This::STATUS_OVERFLOW);
5201 // Do relocate. Update selected bits in text.
5202 // new_val = (val & ~dst_mask) | (immed << doffset)
5204 template<int valsize>
5205 static inline typename This::Status
5206 rela_general(unsigned char* view,
5207 const Sized_relobj_file<size, big_endian>* object,
5208 const Symbol_value<size>* psymval,
5209 AArch64_valtype addend,
5210 const AArch64_reloc_property* reloc_property)
5212 // Calculate relocation.
5213 Address x = psymval->value(object, addend);
5214 return This::template reloc_common<valsize>(view, x, reloc_property);
5217 // Do relocate. Update selected bits in text.
5218 // new val = (val & ~dst_mask) | (immed << doffset)
5220 template<int valsize>
5221 static inline typename This::Status
5223 unsigned char* view,
5225 AArch64_valtype addend,
5226 const AArch64_reloc_property* reloc_property)
5228 // Calculate relocation.
5229 Address x = s + addend;
5230 return This::template reloc_common<valsize>(view, x, reloc_property);
5233 // Do address relative relocate. Update selected bits in text.
5234 // new val = (val & ~dst_mask) | (immed << doffset)
5236 template<int valsize>
5237 static inline typename This::Status
5239 unsigned char* view,
5240 const Sized_relobj_file<size, big_endian>* object,
5241 const Symbol_value<size>* psymval,
5242 AArch64_valtype addend,
5244 const AArch64_reloc_property* reloc_property)
5246 // Calculate relocation.
5247 Address x = psymval->value(object, addend) - address;
5248 return This::template reloc_common<valsize>(view, x, reloc_property);
5252 // Calculate (S + A) - address, update adr instruction.
5254 static inline typename This::Status
5255 adr(unsigned char* view,
5256 const Sized_relobj_file<size, big_endian>* object,
5257 const Symbol_value<size>* psymval,
5260 const AArch64_reloc_property* /* reloc_property */)
5262 AArch64_valtype x = psymval->value(object, addend) - address;
5263 // Pick bits [20:0] of X.
5264 AArch64_valtype immed = x & 0x1fffff;
5265 update_adr(view, immed);
5266 // Check -2^20 <= X < 2^20
5267 return (size == 64 && Bits<21>::has_overflow((x))
5268 ? This::STATUS_OVERFLOW
5269 : This::STATUS_OKAY);
5272 // Calculate PG(S+A) - PG(address), update adrp instruction.
5273 // R_AARCH64_ADR_PREL_PG_HI21
5275 static inline typename This::Status
5277 unsigned char* view,
5281 AArch64_valtype x = This::Page(sa) - This::Page(address);
5282 // Pick [32:12] of X.
5283 AArch64_valtype immed = (x >> 12) & 0x1fffff;
5284 update_adr(view, immed);
5285 // Check -2^32 <= X < 2^32
5286 return (size == 64 && Bits<33>::has_overflow((x))
5287 ? This::STATUS_OVERFLOW
5288 : This::STATUS_OKAY);
5291 // Calculate PG(S+A) - PG(address), update adrp instruction.
5292 // R_AARCH64_ADR_PREL_PG_HI21
5294 static inline typename This::Status
5295 adrp(unsigned char* view,
5296 const Sized_relobj_file<size, big_endian>* object,
5297 const Symbol_value<size>* psymval,
5300 const AArch64_reloc_property* reloc_property)
5302 Address sa = psymval->value(object, addend);
5303 AArch64_valtype x = This::Page(sa) - This::Page(address);
5304 // Pick [32:12] of X.
5305 AArch64_valtype immed = (x >> 12) & 0x1fffff;
5306 update_adr(view, immed);
5307 return (reloc_property->checkup_x_value(x)
5309 : This::STATUS_OVERFLOW);
5312 // Update mov[n/z] instruction. Check overflow if needed.
5313 // If X >=0, set the instruction to movz and its immediate value to the
5315 // If X < 0, set the instruction to movn and its immediate value to
5316 // NOT (selected bits of).
5318 static inline typename This::Status
5319 movnz(unsigned char* view,
5321 const AArch64_reloc_property* reloc_property)
5323 // Select bits from X.
5326 typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW;
5327 if (static_cast<SignedW>(x) >= 0)
5329 immed = reloc_property->select_x_value(x);
5334 immed = reloc_property->select_x_value(~x);;
5338 // Update movnz instruction.
5339 update_movnz(view, immed, is_movz);
5341 // Do check overflow or alignment if needed.
5342 return (reloc_property->checkup_x_value(x)
5344 : This::STATUS_OVERFLOW);
5348 maybe_apply_stub(unsigned int,
5349 const The_relocate_info*,
5353 const Sized_symbol<size>*,
5354 const Symbol_value<size>*,
5355 const Sized_relobj_file<size, big_endian>*,
5358 }; // End of AArch64_relocate_functions
5361 // For a certain relocation type (usually jump/branch), test to see if the
5362 // destination needs a stub to fulfil. If so, re-route the destination of the
5363 // original instruction to the stub, note, at this time, the stub has already
5366 template<int size, bool big_endian>
5368 AArch64_relocate_functions<size, big_endian>::
5369 maybe_apply_stub(unsigned int r_type,
5370 const The_relocate_info* relinfo,
5371 const The_rela& rela,
5372 unsigned char* view,
5374 const Sized_symbol<size>* gsym,
5375 const Symbol_value<size>* psymval,
5376 const Sized_relobj_file<size, big_endian>* object,
5377 section_size_type current_group_size)
5379 if (parameters->options().relocatable())
5382 typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend();
5383 Address branch_target = psymval->value(object, 0) + addend;
5385 The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target);
5386 if (stub_type == ST_NONE)
5389 const The_aarch64_relobj* aarch64_relobj =
5390 static_cast<const The_aarch64_relobj*>(object);
5391 The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
5392 gold_assert(stub_table != NULL);
5394 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5395 typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
5396 The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key);
5397 gold_assert(stub != NULL);
5399 Address new_branch_target = stub_table->address() + stub->offset();
5400 typename elfcpp::Swap<size, big_endian>::Valtype branch_offset =
5401 new_branch_target - address;
5402 const AArch64_reloc_property* arp =
5403 aarch64_reloc_property_table->get_reloc_property(r_type);
5404 gold_assert(arp != NULL);
5405 typename This::Status status = This::template
5406 rela_general<32>(view, branch_offset, 0, arp);
5407 if (status != This::STATUS_OKAY)
5408 gold_error(_("Stub is too far away, try a smaller value "
5409 "for '--stub-group-size'. The current value is 0x%lx."),
5410 static_cast<unsigned long>(current_group_size));
5415 // Group input sections for stub generation.
5417 // We group input sections in an output section so that the total size,
5418 // including any padding space due to alignment is smaller than GROUP_SIZE
5419 // unless the only input section in group is bigger than GROUP_SIZE already.
5420 // Then an ARM stub table is created to follow the last input section
5421 // in group. For each group an ARM stub table is created an is placed
5422 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5423 // extend the group after the stub table.
5425 template<int size, bool big_endian>
5427 Target_aarch64<size, big_endian>::group_sections(
5429 section_size_type group_size,
5430 bool stubs_always_after_branch,
5433 // Group input sections and insert stub table
5434 Layout::Section_list section_list;
5435 layout->get_executable_sections(§ion_list);
5436 for (Layout::Section_list::const_iterator p = section_list.begin();
5437 p != section_list.end();
5440 AArch64_output_section<size, big_endian>* output_section =
5441 static_cast<AArch64_output_section<size, big_endian>*>(*p);
5442 output_section->group_sections(group_size, stubs_always_after_branch,
5448 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5449 // section of RELOBJ.
5451 template<int size, bool big_endian>
5452 AArch64_input_section<size, big_endian>*
5453 Target_aarch64<size, big_endian>::find_aarch64_input_section(
5454 Relobj* relobj, unsigned int shndx) const
5456 Section_id sid(relobj, shndx);
5457 typename AArch64_input_section_map::const_iterator p =
5458 this->aarch64_input_section_map_.find(sid);
5459 return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL;
5463 // Make a new AArch64_input_section object.
5465 template<int size, bool big_endian>
5466 AArch64_input_section<size, big_endian>*
5467 Target_aarch64<size, big_endian>::new_aarch64_input_section(
5468 Relobj* relobj, unsigned int shndx)
5470 Section_id sid(relobj, shndx);
5472 AArch64_input_section<size, big_endian>* input_section =
5473 new AArch64_input_section<size, big_endian>(relobj, shndx);
5474 input_section->init();
5476 // Register new AArch64_input_section in map for look-up.
5477 std::pair<typename AArch64_input_section_map::iterator,bool> ins =
5478 this->aarch64_input_section_map_.insert(
5479 std::make_pair(sid, input_section));
5481 // Make sure that it we have not created another AArch64_input_section
5482 // for this input section already.
5483 gold_assert(ins.second);
5485 return input_section;
5489 // Relaxation hook. This is where we do stub generation.
5491 template<int size, bool big_endian>
5493 Target_aarch64<size, big_endian>::do_relax(
5495 const Input_objects* input_objects,
5496 Symbol_table* symtab,
5500 gold_assert(!parameters->options().relocatable());
5503 // We don't handle negative stub_group_size right now.
5504 this->stub_group_size_ = abs(parameters->options().stub_group_size());
5505 if (this->stub_group_size_ == 1)
5507 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5508 // will fail to link. The user will have to relink with an explicit
5509 // group size option.
5510 this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET -
5513 group_sections(layout, this->stub_group_size_, true, task);
5517 // If this is not the first pass, addresses and file offsets have
5518 // been reset at this point, set them here.
5519 for (Stub_table_iterator sp = this->stub_tables_.begin();
5520 sp != this->stub_tables_.end(); ++sp)
5522 The_stub_table* stt = *sp;
5523 The_aarch64_input_section* owner = stt->owner();
5524 off_t off = align_address(owner->original_size(),
5526 stt->set_address_and_file_offset(owner->address() + off,
5527 owner->offset() + off);
5531 // Scan relocs for relocation stubs
5532 for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
5533 op != input_objects->relobj_end();
5536 The_aarch64_relobj* aarch64_relobj =
5537 static_cast<The_aarch64_relobj*>(*op);
5538 // Lock the object so we can read from it. This is only called
5539 // single-threaded from Layout::finalize, so it is OK to lock.
5540 Task_lock_obj<Object> tl(task, aarch64_relobj);
5541 aarch64_relobj->scan_sections_for_stubs(this, symtab, layout);
5544 bool any_stub_table_changed = false;
5545 for (Stub_table_iterator siter = this->stub_tables_.begin();
5546 siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter)
5548 The_stub_table* stub_table = *siter;
5549 if (stub_table->update_data_size_changed_p())
5551 The_aarch64_input_section* owner = stub_table->owner();
5552 uint64_t address = owner->address();
5553 off_t offset = owner->offset();
5554 owner->reset_address_and_file_offset();
5555 owner->set_address_and_file_offset(address, offset);
5557 any_stub_table_changed = true;
5561 // Do not continue relaxation.
5562 bool continue_relaxation = any_stub_table_changed;
5563 if (!continue_relaxation)
5564 for (Stub_table_iterator sp = this->stub_tables_.begin();
5565 (sp != this->stub_tables_.end());
5567 (*sp)->finalize_stubs();
5569 return continue_relaxation;
5573 // Make a new Stub_table.
5575 template<int size, bool big_endian>
5576 Stub_table<size, big_endian>*
5577 Target_aarch64<size, big_endian>::new_stub_table(
5578 AArch64_input_section<size, big_endian>* owner)
5580 Stub_table<size, big_endian>* stub_table =
5581 new Stub_table<size, big_endian>(owner);
5582 stub_table->set_address(align_address(
5583 owner->address() + owner->data_size(), 8));
5584 stub_table->set_file_offset(owner->offset() + owner->data_size());
5585 stub_table->finalize_data_size();
5587 this->stub_tables_.push_back(stub_table);
5593 template<int size, bool big_endian>
5595 Target_aarch64<size, big_endian>::do_reloc_addend(
5596 void* arg, unsigned int r_type, uint64_t) const
5598 gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
5599 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
5600 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
5601 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
5602 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
5603 gold_assert(psymval->is_tls_symbol());
5604 // The value of a TLS symbol is the offset in the TLS segment.
5605 return psymval->value(ti.object, 0);
5608 // Return the number of entries in the PLT.
5610 template<int size, bool big_endian>
5612 Target_aarch64<size, big_endian>::plt_entry_count() const
5614 if (this->plt_ == NULL)
5616 return this->plt_->entry_count();
5619 // Return the offset of the first non-reserved PLT entry.
5621 template<int size, bool big_endian>
5623 Target_aarch64<size, big_endian>::first_plt_entry_offset() const
5625 return this->plt_->first_plt_entry_offset();
5628 // Return the size of each PLT entry.
5630 template<int size, bool big_endian>
5632 Target_aarch64<size, big_endian>::plt_entry_size() const
5634 return this->plt_->get_plt_entry_size();
5637 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5639 template<int size, bool big_endian>
5641 Target_aarch64<size, big_endian>::define_tls_base_symbol(
5642 Symbol_table* symtab, Layout* layout)
5644 if (this->tls_base_symbol_defined_)
5647 Output_segment* tls_segment = layout->tls_segment();
5648 if (tls_segment != NULL)
5650 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5651 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
5652 Symbol_table::PREDEFINED,
5656 elfcpp::STV_HIDDEN, 0,
5657 Symbol::SEGMENT_START,
5660 this->tls_base_symbol_defined_ = true;
5663 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5665 template<int size, bool big_endian>
5667 Target_aarch64<size, big_endian>::reserve_tlsdesc_entries(
5668 Symbol_table* symtab, Layout* layout)
5670 if (this->plt_ == NULL)
5671 this->make_plt_section(symtab, layout);
5673 if (!this->plt_->has_tlsdesc_entry())
5675 // Allocate the TLSDESC_GOT entry.
5676 Output_data_got_aarch64<size, big_endian>* got =
5677 this->got_section(symtab, layout);
5678 unsigned int got_offset = got->add_constant(0);
5680 // Allocate the TLSDESC_PLT entry.
5681 this->plt_->reserve_tlsdesc_entry(got_offset);
5685 // Create a GOT entry for the TLS module index.
5687 template<int size, bool big_endian>
5689 Target_aarch64<size, big_endian>::got_mod_index_entry(
5690 Symbol_table* symtab, Layout* layout,
5691 Sized_relobj_file<size, big_endian>* object)
5693 if (this->got_mod_index_offset_ == -1U)
5695 gold_assert(symtab != NULL && layout != NULL && object != NULL);
5696 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
5697 Output_data_got_aarch64<size, big_endian>* got =
5698 this->got_section(symtab, layout);
5699 unsigned int got_offset = got->add_constant(0);
5700 rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got,
5702 got->add_constant(0);
5703 this->got_mod_index_offset_ = got_offset;
5705 return this->got_mod_index_offset_;
5708 // Optimize the TLS relocation type based on what we know about the
5709 // symbol. IS_FINAL is true if the final address of this symbol is
5710 // known at link time.
5712 template<int size, bool big_endian>
5713 tls::Tls_optimization
5714 Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final,
5717 // If we are generating a shared library, then we can't do anything
5719 if (parameters->options().shared())
5720 return tls::TLSOPT_NONE;
5724 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
5725 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
5726 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19:
5727 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21:
5728 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
5729 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
5730 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
5731 case elfcpp::R_AARCH64_TLSDESC_OFF_G1:
5732 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC:
5733 case elfcpp::R_AARCH64_TLSDESC_LDR:
5734 case elfcpp::R_AARCH64_TLSDESC_ADD:
5735 case elfcpp::R_AARCH64_TLSDESC_CALL:
5736 // These are General-Dynamic which permits fully general TLS
5737 // access. Since we know that we are generating an executable,
5738 // we can convert this to Initial-Exec. If we also know that
5739 // this is a local symbol, we can further switch to Local-Exec.
5741 return tls::TLSOPT_TO_LE;
5742 return tls::TLSOPT_TO_IE;
5744 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
5745 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
5746 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
5747 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
5748 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
5749 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
5750 // These are Local-Dynamic, which refer to local symbols in the
5751 // dynamic TLS block. Since we know that we generating an
5752 // executable, we can switch to Local-Exec.
5753 return tls::TLSOPT_TO_LE;
5755 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
5756 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
5757 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
5758 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
5759 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
5760 // These are Initial-Exec relocs which get the thread offset
5761 // from the GOT. If we know that we are linking against the
5762 // local symbol, we can switch to Local-Exec, which links the
5763 // thread offset into the instruction.
5765 return tls::TLSOPT_TO_LE;
5766 return tls::TLSOPT_NONE;
5768 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
5769 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
5770 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
5771 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
5772 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
5773 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
5774 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
5775 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
5776 // When we already have Local-Exec, there is nothing further we
5778 return tls::TLSOPT_NONE;
5785 // Returns true if this relocation type could be that of a function pointer.
5787 template<int size, bool big_endian>
5789 Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc(
5790 unsigned int r_type)
5794 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
5795 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
5796 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
5797 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
5798 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
5806 // For safe ICF, scan a relocation for a local symbol to check if it
5807 // corresponds to a function pointer being taken. In that case mark
5808 // the function whose pointer was taken as not foldable.
5810 template<int size, bool big_endian>
5812 Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer(
5815 Target_aarch64<size, big_endian>* ,
5816 Sized_relobj_file<size, big_endian>* ,
5819 const elfcpp::Rela<size, big_endian>& ,
5820 unsigned int r_type,
5821 const elfcpp::Sym<size, big_endian>&)
5823 // When building a shared library, do not fold any local symbols.
5824 return (parameters->options().shared()
5825 || possible_function_pointer_reloc(r_type));
5828 // For safe ICF, scan a relocation for a global symbol to check if it
5829 // corresponds to a function pointer being taken. In that case mark
5830 // the function whose pointer was taken as not foldable.
5832 template<int size, bool big_endian>
5834 Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer(
5837 Target_aarch64<size, big_endian>* ,
5838 Sized_relobj_file<size, big_endian>* ,
5841 const elfcpp::Rela<size, big_endian>& ,
5842 unsigned int r_type,
5845 // When building a shared library, do not fold symbols whose visibility
5846 // is hidden, internal or protected.
5847 return ((parameters->options().shared()
5848 && (gsym->visibility() == elfcpp::STV_INTERNAL
5849 || gsym->visibility() == elfcpp::STV_PROTECTED
5850 || gsym->visibility() == elfcpp::STV_HIDDEN))
5851 || possible_function_pointer_reloc(r_type));
5854 // Report an unsupported relocation against a local symbol.
5856 template<int size, bool big_endian>
5858 Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local(
5859 Sized_relobj_file<size, big_endian>* object,
5860 unsigned int r_type)
5862 gold_error(_("%s: unsupported reloc %u against local symbol"),
5863 object->name().c_str(), r_type);
5866 // We are about to emit a dynamic relocation of type R_TYPE. If the
5867 // dynamic linker does not support it, issue an error.
5869 template<int size, bool big_endian>
5871 Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object,
5872 unsigned int r_type)
5874 gold_assert(r_type != elfcpp::R_AARCH64_NONE);
5878 // These are the relocation types supported by glibc for AARCH64.
5879 case elfcpp::R_AARCH64_NONE:
5880 case elfcpp::R_AARCH64_COPY:
5881 case elfcpp::R_AARCH64_GLOB_DAT:
5882 case elfcpp::R_AARCH64_JUMP_SLOT:
5883 case elfcpp::R_AARCH64_RELATIVE:
5884 case elfcpp::R_AARCH64_TLS_DTPREL64:
5885 case elfcpp::R_AARCH64_TLS_DTPMOD64:
5886 case elfcpp::R_AARCH64_TLS_TPREL64:
5887 case elfcpp::R_AARCH64_TLSDESC:
5888 case elfcpp::R_AARCH64_IRELATIVE:
5889 case elfcpp::R_AARCH64_ABS32:
5890 case elfcpp::R_AARCH64_ABS64:
5897 // This prevents us from issuing more than one error per reloc
5898 // section. But we can still wind up issuing more than one
5899 // error per object file.
5900 if (this->issued_non_pic_error_)
5902 gold_assert(parameters->options().output_is_position_independent());
5903 object->error(_("requires unsupported dynamic reloc; "
5904 "recompile with -fPIC"));
5905 this->issued_non_pic_error_ = true;
5909 // Return whether we need to make a PLT entry for a relocation of the
5910 // given type against a STT_GNU_IFUNC symbol.
5912 template<int size, bool big_endian>
5914 Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc(
5915 Sized_relobj_file<size, big_endian>* object,
5916 unsigned int r_type)
5918 const AArch64_reloc_property* arp =
5919 aarch64_reloc_property_table->get_reloc_property(r_type);
5920 gold_assert(arp != NULL);
5922 int flags = arp->reference_flags();
5923 if (flags & Symbol::TLS_REF)
5925 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5926 object->name().c_str(), arp->name().c_str());
5932 // Scan a relocation for a local symbol.
5934 template<int size, bool big_endian>
5936 Target_aarch64<size, big_endian>::Scan::local(
5937 Symbol_table* symtab,
5939 Target_aarch64<size, big_endian>* target,
5940 Sized_relobj_file<size, big_endian>* object,
5941 unsigned int data_shndx,
5942 Output_section* output_section,
5943 const elfcpp::Rela<size, big_endian>& rela,
5944 unsigned int r_type,
5945 const elfcpp::Sym<size, big_endian>& lsym,
5951 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
5953 Output_data_got_aarch64<size, big_endian>* got =
5954 target->got_section(symtab, layout);
5955 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5957 // A local STT_GNU_IFUNC symbol may require a PLT entry.
5958 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
5959 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
5960 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
5964 case elfcpp::R_AARCH64_ABS32:
5965 case elfcpp::R_AARCH64_ABS16:
5966 if (parameters->options().output_is_position_independent())
5968 gold_error(_("%s: unsupported reloc %u in pos independent link."),
5969 object->name().c_str(), r_type);
5973 case elfcpp::R_AARCH64_ABS64:
5974 // If building a shared library or pie, we need to mark this as a dynmic
5975 // reloction, so that the dynamic loader can relocate it.
5976 if (parameters->options().output_is_position_independent())
5978 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
5979 rela_dyn->add_local_relative(object, r_sym,
5980 elfcpp::R_AARCH64_RELATIVE,
5983 rela.get_r_offset(),
5984 rela.get_r_addend(),
5989 case elfcpp::R_AARCH64_PREL64:
5990 case elfcpp::R_AARCH64_PREL32:
5991 case elfcpp::R_AARCH64_PREL16:
5994 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
5995 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
5996 // This pair of relocations is used to access a specific GOT entry.
5998 bool is_new = false;
5999 // This symbol requires a GOT entry.
6001 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
6003 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
6004 if (is_new && parameters->options().output_is_position_independent())
6005 target->rela_dyn_section(layout)->
6006 add_local_relative(object,
6008 elfcpp::R_AARCH64_RELATIVE,
6010 object->local_got_offset(r_sym,
6017 case elfcpp::R_AARCH64_LD_PREL_LO19: // 273
6018 case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274
6019 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275
6020 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
6021 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277
6022 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278
6023 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284
6024 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285
6025 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286
6026 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
6029 // Control flow, pc-relative. We don't need to do anything for a relative
6030 // addressing relocation against a local symbol if it does not reference
6032 case elfcpp::R_AARCH64_TSTBR14:
6033 case elfcpp::R_AARCH64_CONDBR19:
6034 case elfcpp::R_AARCH64_JUMP26:
6035 case elfcpp::R_AARCH64_CALL26:
6038 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
6039 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
6041 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6042 optimize_tls_reloc(!parameters->options().shared(), r_type);
6043 if (tlsopt == tls::TLSOPT_TO_LE)
6046 layout->set_has_static_tls();
6047 // Create a GOT entry for the tp-relative offset.
6048 if (!parameters->doing_static_link())
6050 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
6051 target->rela_dyn_section(layout),
6052 elfcpp::R_AARCH64_TLS_TPREL64);
6054 else if (!object->local_has_got_offset(r_sym,
6055 GOT_TYPE_TLS_OFFSET))
6057 got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET);
6058 unsigned int got_offset =
6059 object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
6060 const elfcpp::Elf_Xword addend = rela.get_r_addend();
6061 gold_assert(addend == 0);
6062 got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64,
6068 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
6069 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
6071 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6072 optimize_tls_reloc(!parameters->options().shared(), r_type);
6073 if (tlsopt == tls::TLSOPT_TO_LE)
6075 layout->set_has_static_tls();
6078 gold_assert(tlsopt == tls::TLSOPT_NONE);
6080 got->add_local_pair_with_rel(object,r_sym, data_shndx,
6082 target->rela_dyn_section(layout),
6083 elfcpp::R_AARCH64_TLS_DTPMOD64);
6087 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
6088 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
6089 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
6090 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
6091 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
6092 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
6093 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
6094 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
6096 layout->set_has_static_tls();
6097 bool output_is_shared = parameters->options().shared();
6098 if (output_is_shared)
6099 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6100 object->name().c_str(), r_type);
6104 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
6105 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
6107 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6108 optimize_tls_reloc(!parameters->options().shared(), r_type);
6109 if (tlsopt == tls::TLSOPT_NONE)
6111 // Create a GOT entry for the module index.
6112 target->got_mod_index_entry(symtab, layout, object);
6114 else if (tlsopt != tls::TLSOPT_TO_LE)
6115 unsupported_reloc_local(object, r_type);
6119 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
6120 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
6121 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
6122 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
6125 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
6126 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
6127 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
6129 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6130 optimize_tls_reloc(!parameters->options().shared(), r_type);
6131 target->define_tls_base_symbol(symtab, layout);
6132 if (tlsopt == tls::TLSOPT_NONE)
6134 // Create reserved PLT and GOT entries for the resolver.
6135 target->reserve_tlsdesc_entries(symtab, layout);
6137 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6138 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6139 // entry needs to be in an area in .got.plt, not .got. Call
6140 // got_section to make sure the section has been created.
6141 target->got_section(symtab, layout);
6142 Output_data_got<size, big_endian>* got =
6143 target->got_tlsdesc_section();
6144 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6145 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
6147 unsigned int got_offset = got->add_constant(0);
6148 got->add_constant(0);
6149 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
6151 Reloc_section* rt = target->rela_tlsdesc_section(layout);
6152 // We store the arguments we need in a vector, and use
6153 // the index into the vector as the parameter to pass
6154 // to the target specific routines.
6155 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
6156 void* arg = reinterpret_cast<void*>(intarg);
6157 rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg,
6158 got, got_offset, 0);
6161 else if (tlsopt != tls::TLSOPT_TO_LE)
6162 unsupported_reloc_local(object, r_type);
6166 case elfcpp::R_AARCH64_TLSDESC_CALL:
6170 unsupported_reloc_local(object, r_type);
6175 // Report an unsupported relocation against a global symbol.
6177 template<int size, bool big_endian>
6179 Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global(
6180 Sized_relobj_file<size, big_endian>* object,
6181 unsigned int r_type,
6184 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6185 object->name().c_str(), r_type, gsym->demangled_name().c_str());
6188 template<int size, bool big_endian>
6190 Target_aarch64<size, big_endian>::Scan::global(
6191 Symbol_table* symtab,
6193 Target_aarch64<size, big_endian>* target,
6194 Sized_relobj_file<size, big_endian> * object,
6195 unsigned int data_shndx,
6196 Output_section* output_section,
6197 const elfcpp::Rela<size, big_endian>& rela,
6198 unsigned int r_type,
6201 // A STT_GNU_IFUNC symbol may require a PLT entry.
6202 if (gsym->type() == elfcpp::STT_GNU_IFUNC
6203 && this->reloc_needs_plt_for_ifunc(object, r_type))
6204 target->make_plt_entry(symtab, layout, gsym);
6206 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
6208 const AArch64_reloc_property* arp =
6209 aarch64_reloc_property_table->get_reloc_property(r_type);
6210 gold_assert(arp != NULL);
6214 case elfcpp::R_AARCH64_ABS16:
6215 case elfcpp::R_AARCH64_ABS32:
6216 case elfcpp::R_AARCH64_ABS64:
6218 // Make a PLT entry if necessary.
6219 if (gsym->needs_plt_entry())
6221 target->make_plt_entry(symtab, layout, gsym);
6222 // Since this is not a PC-relative relocation, we may be
6223 // taking the address of a function. In that case we need to
6224 // set the entry in the dynamic symbol table to the address of
6226 if (gsym->is_from_dynobj() && !parameters->options().shared())
6227 gsym->set_needs_dynsym_value();
6229 // Make a dynamic relocation if necessary.
6230 if (gsym->needs_dynamic_reloc(arp->reference_flags()))
6232 if (!parameters->options().output_is_position_independent()
6233 && gsym->may_need_copy_reloc())
6235 target->copy_reloc(symtab, layout, object,
6236 data_shndx, output_section, gsym, rela);
6238 else if (r_type == elfcpp::R_AARCH64_ABS64
6239 && gsym->type() == elfcpp::STT_GNU_IFUNC
6240 && gsym->can_use_relative_reloc(false)
6241 && !gsym->is_from_dynobj()
6242 && !gsym->is_undefined()
6243 && !gsym->is_preemptible())
6245 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6246 // symbol. This makes a function address in a PIE executable
6247 // match the address in a shared library that it links against.
6248 Reloc_section* rela_dyn =
6249 target->rela_irelative_section(layout);
6250 unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE;
6251 rela_dyn->add_symbolless_global_addend(gsym, r_type,
6252 output_section, object,
6254 rela.get_r_offset(),
6255 rela.get_r_addend());
6257 else if (r_type == elfcpp::R_AARCH64_ABS64
6258 && gsym->can_use_relative_reloc(false))
6260 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6261 rela_dyn->add_global_relative(gsym,
6262 elfcpp::R_AARCH64_RELATIVE,
6266 rela.get_r_offset(),
6267 rela.get_r_addend(),
6272 check_non_pic(object, r_type);
6273 Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*
6274 rela_dyn = target->rela_dyn_section(layout);
6275 rela_dyn->add_global(
6276 gsym, r_type, output_section, object,
6277 data_shndx, rela.get_r_offset(),rela.get_r_addend());
6283 case elfcpp::R_AARCH64_PREL16:
6284 case elfcpp::R_AARCH64_PREL32:
6285 case elfcpp::R_AARCH64_PREL64:
6286 // This is used to fill the GOT absolute address.
6287 if (gsym->needs_plt_entry())
6289 target->make_plt_entry(symtab, layout, gsym);
6293 case elfcpp::R_AARCH64_LD_PREL_LO19: // 273
6294 case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274
6295 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275
6296 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
6297 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277
6298 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278
6299 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284
6300 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285
6301 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286
6302 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
6304 if (gsym->needs_plt_entry())
6305 target->make_plt_entry(symtab, layout, gsym);
6306 // Make a dynamic relocation if necessary.
6307 if (gsym->needs_dynamic_reloc(arp->reference_flags()))
6309 if (parameters->options().output_is_executable()
6310 && gsym->may_need_copy_reloc())
6312 target->copy_reloc(symtab, layout, object,
6313 data_shndx, output_section, gsym, rela);
6319 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6320 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6322 // This pair of relocations is used to access a specific GOT entry.
6323 // Note a GOT entry is an *address* to a symbol.
6324 // The symbol requires a GOT entry
6325 Output_data_got_aarch64<size, big_endian>* got =
6326 target->got_section(symtab, layout);
6327 if (gsym->final_value_is_known())
6329 // For a STT_GNU_IFUNC symbol we want the PLT address.
6330 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
6331 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
6333 got->add_global(gsym, GOT_TYPE_STANDARD);
6337 // If this symbol is not fully resolved, we need to add a dynamic
6338 // relocation for it.
6339 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6341 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6343 // 1) The symbol may be defined in some other module.
6344 // 2) We are building a shared library and this is a protected
6345 // symbol; using GLOB_DAT means that the dynamic linker can use
6346 // the address of the PLT in the main executable when appropriate
6347 // so that function address comparisons work.
6348 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6349 // again so that function address comparisons work.
6350 if (gsym->is_from_dynobj()
6351 || gsym->is_undefined()
6352 || gsym->is_preemptible()
6353 || (gsym->visibility() == elfcpp::STV_PROTECTED
6354 && parameters->options().shared())
6355 || (gsym->type() == elfcpp::STT_GNU_IFUNC
6356 && parameters->options().output_is_position_independent()))
6357 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
6358 rela_dyn, elfcpp::R_AARCH64_GLOB_DAT);
6361 // For a STT_GNU_IFUNC symbol we want to write the PLT
6362 // offset into the GOT, so that function pointer
6363 // comparisons work correctly.
6365 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
6366 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
6369 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
6370 // Tell the dynamic linker to use the PLT address
6371 // when resolving relocations.
6372 if (gsym->is_from_dynobj()
6373 && !parameters->options().shared())
6374 gsym->set_needs_dynsym_value();
6378 rela_dyn->add_global_relative(
6379 gsym, elfcpp::R_AARCH64_RELATIVE,
6381 gsym->got_offset(GOT_TYPE_STANDARD),
6390 case elfcpp::R_AARCH64_TSTBR14:
6391 case elfcpp::R_AARCH64_CONDBR19:
6392 case elfcpp::R_AARCH64_JUMP26:
6393 case elfcpp::R_AARCH64_CALL26:
6395 if (gsym->final_value_is_known())
6398 if (gsym->is_defined() &&
6399 !gsym->is_from_dynobj() &&
6400 !gsym->is_preemptible())
6403 // Make plt entry for function call.
6404 target->make_plt_entry(symtab, layout, gsym);
6408 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
6409 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic
6411 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6412 optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6413 if (tlsopt == tls::TLSOPT_TO_LE)
6415 layout->set_has_static_tls();
6418 gold_assert(tlsopt == tls::TLSOPT_NONE);
6421 Output_data_got_aarch64<size, big_endian>* got =
6422 target->got_section(symtab, layout);
6423 // Create 2 consecutive entries for module index and offset.
6424 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
6425 target->rela_dyn_section(layout),
6426 elfcpp::R_AARCH64_TLS_DTPMOD64,
6427 elfcpp::R_AARCH64_TLS_DTPREL64);
6431 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
6432 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic
6434 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6435 optimize_tls_reloc(!parameters->options().shared(), r_type);
6436 if (tlsopt == tls::TLSOPT_NONE)
6438 // Create a GOT entry for the module index.
6439 target->got_mod_index_entry(symtab, layout, object);
6441 else if (tlsopt != tls::TLSOPT_TO_LE)
6442 unsupported_reloc_local(object, r_type);
6446 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
6447 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
6448 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
6449 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic
6452 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
6453 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable
6455 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6456 optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6457 if (tlsopt == tls::TLSOPT_TO_LE)
6460 layout->set_has_static_tls();
6461 // Create a GOT entry for the tp-relative offset.
6462 Output_data_got_aarch64<size, big_endian>* got
6463 = target->got_section(symtab, layout);
6464 if (!parameters->doing_static_link())
6466 got->add_global_with_rel(
6467 gsym, GOT_TYPE_TLS_OFFSET,
6468 target->rela_dyn_section(layout),
6469 elfcpp::R_AARCH64_TLS_TPREL64);
6471 if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET))
6473 got->add_global(gsym, GOT_TYPE_TLS_OFFSET);
6474 unsigned int got_offset =
6475 gsym->got_offset(GOT_TYPE_TLS_OFFSET);
6476 const elfcpp::Elf_Xword addend = rela.get_r_addend();
6477 gold_assert(addend == 0);
6478 got->add_static_reloc(got_offset,
6479 elfcpp::R_AARCH64_TLS_TPREL64, gsym);
6484 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
6485 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
6486 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
6487 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
6488 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
6489 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
6490 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
6491 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable
6492 layout->set_has_static_tls();
6493 if (parameters->options().shared())
6494 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6495 object->name().c_str(), r_type);
6498 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
6499 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
6500 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor
6502 target->define_tls_base_symbol(symtab, layout);
6503 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6504 optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6505 if (tlsopt == tls::TLSOPT_NONE)
6507 // Create reserved PLT and GOT entries for the resolver.
6508 target->reserve_tlsdesc_entries(symtab, layout);
6510 // Create a double GOT entry with an R_AARCH64_TLSDESC
6511 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6512 // entry needs to be in an area in .got.plt, not .got. Call
6513 // got_section to make sure the section has been created.
6514 target->got_section(symtab, layout);
6515 Output_data_got<size, big_endian>* got =
6516 target->got_tlsdesc_section();
6517 Reloc_section* rt = target->rela_tlsdesc_section(layout);
6518 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
6519 elfcpp::R_AARCH64_TLSDESC, 0);
6521 else if (tlsopt == tls::TLSOPT_TO_IE)
6523 // Create a GOT entry for the tp-relative offset.
6524 Output_data_got<size, big_endian>* got
6525 = target->got_section(symtab, layout);
6526 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
6527 target->rela_dyn_section(layout),
6528 elfcpp::R_AARCH64_TLS_TPREL64);
6530 else if (tlsopt != tls::TLSOPT_TO_LE)
6531 unsupported_reloc_global(object, r_type, gsym);
6535 case elfcpp::R_AARCH64_TLSDESC_CALL:
6539 gold_error(_("%s: unsupported reloc type in global scan"),
6540 aarch64_reloc_property_table->
6541 reloc_name_in_error_message(r_type).c_str());
6544 } // End of Scan::global
6547 // Create the PLT section.
6548 template<int size, bool big_endian>
6550 Target_aarch64<size, big_endian>::make_plt_section(
6551 Symbol_table* symtab, Layout* layout)
6553 if (this->plt_ == NULL)
6555 // Create the GOT section first.
6556 this->got_section(symtab, layout);
6558 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
6559 this->got_irelative_);
6561 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
6563 | elfcpp::SHF_EXECINSTR),
6564 this->plt_, ORDER_PLT, false);
6566 // Make the sh_info field of .rela.plt point to .plt.
6567 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
6568 rela_plt_os->set_info_section(this->plt_->output_section());
6572 // Return the section for TLSDESC relocations.
6574 template<int size, bool big_endian>
6575 typename Target_aarch64<size, big_endian>::Reloc_section*
6576 Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const
6578 return this->plt_section()->rela_tlsdesc(layout);
6581 // Create a PLT entry for a global symbol.
6583 template<int size, bool big_endian>
6585 Target_aarch64<size, big_endian>::make_plt_entry(
6586 Symbol_table* symtab,
6590 if (gsym->has_plt_offset())
6593 if (this->plt_ == NULL)
6594 this->make_plt_section(symtab, layout);
6596 this->plt_->add_entry(symtab, layout, gsym);
6599 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6601 template<int size, bool big_endian>
6603 Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry(
6604 Symbol_table* symtab, Layout* layout,
6605 Sized_relobj_file<size, big_endian>* relobj,
6606 unsigned int local_sym_index)
6608 if (relobj->local_has_plt_offset(local_sym_index))
6610 if (this->plt_ == NULL)
6611 this->make_plt_section(symtab, layout);
6612 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
6615 relobj->set_local_plt_offset(local_sym_index, plt_offset);
6618 template<int size, bool big_endian>
6620 Target_aarch64<size, big_endian>::gc_process_relocs(
6621 Symbol_table* symtab,
6623 Sized_relobj_file<size, big_endian>* object,
6624 unsigned int data_shndx,
6625 unsigned int sh_type,
6626 const unsigned char* prelocs,
6628 Output_section* output_section,
6629 bool needs_special_offset_handling,
6630 size_t local_symbol_count,
6631 const unsigned char* plocal_symbols)
6633 if (sh_type == elfcpp::SHT_REL)
6638 gold::gc_process_relocs<
6640 Target_aarch64<size, big_endian>,
6642 typename Target_aarch64<size, big_endian>::Scan,
6643 typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>(
6652 needs_special_offset_handling,
6657 // Scan relocations for a section.
6659 template<int size, bool big_endian>
6661 Target_aarch64<size, big_endian>::scan_relocs(
6662 Symbol_table* symtab,
6664 Sized_relobj_file<size, big_endian>* object,
6665 unsigned int data_shndx,
6666 unsigned int sh_type,
6667 const unsigned char* prelocs,
6669 Output_section* output_section,
6670 bool needs_special_offset_handling,
6671 size_t local_symbol_count,
6672 const unsigned char* plocal_symbols)
6674 if (sh_type == elfcpp::SHT_REL)
6676 gold_error(_("%s: unsupported REL reloc section"),
6677 object->name().c_str());
6680 gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>(
6689 needs_special_offset_handling,
6694 // Return the value to use for a dynamic which requires special
6695 // treatment. This is how we support equality comparisons of function
6696 // pointers across shared library boundaries, as described in the
6697 // processor specific ABI supplement.
6699 template<int size, bool big_endian>
6701 Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
6703 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
6704 return this->plt_address_for_global(gsym);
6708 // Finalize the sections.
6710 template<int size, bool big_endian>
6712 Target_aarch64<size, big_endian>::do_finalize_sections(
6714 const Input_objects*,
6715 Symbol_table* symtab)
6717 const Reloc_section* rel_plt = (this->plt_ == NULL
6719 : this->plt_->rela_plt());
6720 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
6721 this->rela_dyn_, true, false);
6723 // Emit any relocs we saved in an attempt to avoid generating COPY
6725 if (this->copy_relocs_.any_saved_relocs())
6726 this->copy_relocs_.emit(this->rela_dyn_section(layout));
6728 // Fill in some more dynamic tags.
6729 Output_data_dynamic* const odyn = layout->dynamic_data();
6732 if (this->plt_ != NULL
6733 && this->plt_->output_section() != NULL
6734 && this->plt_ ->has_tlsdesc_entry())
6736 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
6737 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
6738 this->got_->finalize_data_size();
6739 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
6740 this->plt_, plt_offset);
6741 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
6742 this->got_, got_offset);
6746 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6747 // the .got.plt section.
6748 Symbol* sym = this->global_offset_table_;
6751 uint64_t data_size = this->got_plt_->current_data_size();
6752 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
6754 // If the .got section is more than 0x8000 bytes, we add
6755 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6756 // bit relocations have a greater chance of working.
6757 if (data_size >= 0x8000)
6758 symtab->get_sized_symbol<size>(sym)->set_value(
6759 symtab->get_sized_symbol<size>(sym)->value() + 0x8000);
6762 if (parameters->doing_static_link()
6763 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
6765 // If linking statically, make sure that the __rela_iplt symbols
6766 // were defined if necessary, even if we didn't create a PLT.
6767 static const Define_symbol_in_segment syms[] =
6770 "__rela_iplt_start", // name
6771 elfcpp::PT_LOAD, // segment_type
6772 elfcpp::PF_W, // segment_flags_set
6773 elfcpp::PF(0), // segment_flags_clear
6776 elfcpp::STT_NOTYPE, // type
6777 elfcpp::STB_GLOBAL, // binding
6778 elfcpp::STV_HIDDEN, // visibility
6780 Symbol::SEGMENT_START, // offset_from_base
6784 "__rela_iplt_end", // name
6785 elfcpp::PT_LOAD, // segment_type
6786 elfcpp::PF_W, // segment_flags_set
6787 elfcpp::PF(0), // segment_flags_clear
6790 elfcpp::STT_NOTYPE, // type
6791 elfcpp::STB_GLOBAL, // binding
6792 elfcpp::STV_HIDDEN, // visibility
6794 Symbol::SEGMENT_START, // offset_from_base
6799 symtab->define_symbols(layout, 2, syms,
6800 layout->script_options()->saw_sections_clause());
6806 // Perform a relocation.
6808 template<int size, bool big_endian>
6810 Target_aarch64<size, big_endian>::Relocate::relocate(
6811 const Relocate_info<size, big_endian>* relinfo,
6812 Target_aarch64<size, big_endian>* target,
6815 const elfcpp::Rela<size, big_endian>& rela,
6816 unsigned int r_type,
6817 const Sized_symbol<size>* gsym,
6818 const Symbol_value<size>* psymval,
6819 unsigned char* view,
6820 typename elfcpp::Elf_types<size>::Elf_Addr address,
6821 section_size_type /* view_size */)
6826 typedef AArch64_relocate_functions<size, big_endian> Reloc;
6828 const AArch64_reloc_property* reloc_property =
6829 aarch64_reloc_property_table->get_reloc_property(r_type);
6831 if (reloc_property == NULL)
6833 std::string reloc_name =
6834 aarch64_reloc_property_table->reloc_name_in_error_message(r_type);
6835 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
6836 _("cannot relocate %s in object file"),
6837 reloc_name.c_str());
6841 const Sized_relobj_file<size, big_endian>* object = relinfo->object;
6843 // Pick the value to use for symbols defined in the PLT.
6844 Symbol_value<size> symval;
6846 && gsym->use_plt_offset(reloc_property->reference_flags()))
6848 symval.set_output_value(target->plt_address_for_global(gsym));
6851 else if (gsym == NULL && psymval->is_ifunc_symbol())
6853 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6854 if (object->local_has_plt_offset(r_sym))
6856 symval.set_output_value(target->plt_address_for_local(object, r_sym));
6861 const elfcpp::Elf_Xword addend = rela.get_r_addend();
6863 // Get the GOT offset if needed.
6864 // For aarch64, the GOT pointer points to the start of the GOT section.
6865 bool have_got_offset = false;
6867 int got_base = (target->got_ != NULL
6868 ? (target->got_->current_data_size() >= 0x8000
6873 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0:
6874 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC:
6875 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1:
6876 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC:
6877 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2:
6878 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC:
6879 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3:
6880 case elfcpp::R_AARCH64_GOTREL64:
6881 case elfcpp::R_AARCH64_GOTREL32:
6882 case elfcpp::R_AARCH64_GOT_LD_PREL19:
6883 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15:
6884 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6885 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6886 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
6889 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
6890 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base;
6894 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6895 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
6896 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
6899 have_got_offset = true;
6906 typename Reloc::Status reloc_status = Reloc::STATUS_OKAY;
6907 typename elfcpp::Elf_types<size>::Elf_Addr value;
6910 case elfcpp::R_AARCH64_NONE:
6913 case elfcpp::R_AARCH64_ABS64:
6914 if (!parameters->options().apply_dynamic_relocs()
6915 && parameters->options().output_is_position_independent()
6917 && gsym->needs_dynamic_reloc(reloc_property->reference_flags())
6918 && !gsym->can_use_relative_reloc(false))
6919 // We have generated an absolute dynamic relocation, so do not
6920 // apply the relocation statically. (Works around bugs in older
6921 // Android dynamic linkers.)
6923 reloc_status = Reloc::template rela_ua<64>(
6924 view, object, psymval, addend, reloc_property);
6927 case elfcpp::R_AARCH64_ABS32:
6928 if (!parameters->options().apply_dynamic_relocs()
6929 && parameters->options().output_is_position_independent()
6931 && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
6932 // We have generated an absolute dynamic relocation, so do not
6933 // apply the relocation statically. (Works around bugs in older
6934 // Android dynamic linkers.)
6936 reloc_status = Reloc::template rela_ua<32>(
6937 view, object, psymval, addend, reloc_property);
6940 case elfcpp::R_AARCH64_ABS16:
6941 if (!parameters->options().apply_dynamic_relocs()
6942 && parameters->options().output_is_position_independent()
6944 && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
6945 // We have generated an absolute dynamic relocation, so do not
6946 // apply the relocation statically. (Works around bugs in older
6947 // Android dynamic linkers.)
6949 reloc_status = Reloc::template rela_ua<16>(
6950 view, object, psymval, addend, reloc_property);
6953 case elfcpp::R_AARCH64_PREL64:
6954 reloc_status = Reloc::template pcrela_ua<64>(
6955 view, object, psymval, addend, address, reloc_property);
6958 case elfcpp::R_AARCH64_PREL32:
6959 reloc_status = Reloc::template pcrela_ua<32>(
6960 view, object, psymval, addend, address, reloc_property);
6963 case elfcpp::R_AARCH64_PREL16:
6964 reloc_status = Reloc::template pcrela_ua<16>(
6965 view, object, psymval, addend, address, reloc_property);
6968 case elfcpp::R_AARCH64_LD_PREL_LO19:
6969 reloc_status = Reloc::template pcrela_general<32>(
6970 view, object, psymval, addend, address, reloc_property);
6973 case elfcpp::R_AARCH64_ADR_PREL_LO21:
6974 reloc_status = Reloc::adr(view, object, psymval, addend,
6975 address, reloc_property);
6978 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
6979 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
6980 reloc_status = Reloc::adrp(view, object, psymval, addend, address,
6984 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC:
6985 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC:
6986 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC:
6987 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC:
6988 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC:
6989 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
6990 reloc_status = Reloc::template rela_general<32>(
6991 view, object, psymval, addend, reloc_property);
6994 case elfcpp::R_AARCH64_CALL26:
6995 if (this->skip_call_tls_get_addr_)
6997 // Double check that the TLSGD insn has been optimized away.
6998 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
6999 Insntype insn = elfcpp::Swap<32, big_endian>::readval(
7000 reinterpret_cast<Insntype*>(view));
7001 gold_assert((insn & 0xff000000) == 0x91000000);
7003 reloc_status = Reloc::STATUS_OKAY;
7004 this->skip_call_tls_get_addr_ = false;
7005 // Return false to stop further processing this reloc.
7009 case elfcpp::R_AARCH64_JUMP26:
7010 if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address,
7011 gsym, psymval, object,
7012 target->stub_group_size_))
7015 case elfcpp::R_AARCH64_TSTBR14:
7016 case elfcpp::R_AARCH64_CONDBR19:
7017 reloc_status = Reloc::template pcrela_general<32>(
7018 view, object, psymval, addend, address, reloc_property);
7021 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
7022 gold_assert(have_got_offset);
7023 value = target->got_->address() + got_base + got_offset;
7024 reloc_status = Reloc::adrp(view, value + addend, address);
7027 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
7028 gold_assert(have_got_offset);
7029 value = target->got_->address() + got_base + got_offset;
7030 reloc_status = Reloc::template rela_general<32>(
7031 view, value, addend, reloc_property);
7034 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7035 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
7036 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7037 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
7038 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7039 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7040 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7041 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
7042 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7043 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
7044 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7045 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7046 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
7047 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7048 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
7049 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
7050 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
7051 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
7052 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7053 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7054 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7055 case elfcpp::R_AARCH64_TLSDESC_CALL:
7056 reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type,
7057 gsym, psymval, view, address);
7060 // These are dynamic relocations, which are unexpected when linking.
7061 case elfcpp::R_AARCH64_COPY:
7062 case elfcpp::R_AARCH64_GLOB_DAT:
7063 case elfcpp::R_AARCH64_JUMP_SLOT:
7064 case elfcpp::R_AARCH64_RELATIVE:
7065 case elfcpp::R_AARCH64_IRELATIVE:
7066 case elfcpp::R_AARCH64_TLS_DTPREL64:
7067 case elfcpp::R_AARCH64_TLS_DTPMOD64:
7068 case elfcpp::R_AARCH64_TLS_TPREL64:
7069 case elfcpp::R_AARCH64_TLSDESC:
7070 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7071 _("unexpected reloc %u in object file"),
7076 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7077 _("unsupported reloc %s"),
7078 reloc_property->name().c_str());
7082 // Report any errors.
7083 switch (reloc_status)
7085 case Reloc::STATUS_OKAY:
7087 case Reloc::STATUS_OVERFLOW:
7088 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7089 _("relocation overflow in %s"),
7090 reloc_property->name().c_str());
7092 case Reloc::STATUS_BAD_RELOC:
7093 gold_error_at_location(
7096 rela.get_r_offset(),
7097 _("unexpected opcode while processing relocation %s"),
7098 reloc_property->name().c_str());
7108 template<int size, bool big_endian>
7110 typename AArch64_relocate_functions<size, big_endian>::Status
7111 Target_aarch64<size, big_endian>::Relocate::relocate_tls(
7112 const Relocate_info<size, big_endian>* relinfo,
7113 Target_aarch64<size, big_endian>* target,
7115 const elfcpp::Rela<size, big_endian>& rela,
7116 unsigned int r_type, const Sized_symbol<size>* gsym,
7117 const Symbol_value<size>* psymval,
7118 unsigned char* view,
7119 typename elfcpp::Elf_types<size>::Elf_Addr address)
7121 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7122 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7124 Output_segment* tls_segment = relinfo->layout->tls_segment();
7125 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7126 const AArch64_reloc_property* reloc_property =
7127 aarch64_reloc_property_table->get_reloc_property(r_type);
7128 gold_assert(reloc_property != NULL);
7130 const bool is_final = (gsym == NULL
7131 ? !parameters->options().shared()
7132 : gsym->final_value_is_known());
7133 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
7134 optimize_tls_reloc(is_final, r_type);
7136 Sized_relobj_file<size, big_endian>* object = relinfo->object;
7137 int tls_got_offset_type;
7140 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7141 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic
7143 if (tlsopt == tls::TLSOPT_TO_LE)
7145 if (tls_segment == NULL)
7147 gold_assert(parameters->errors()->error_count() > 0
7148 || issue_undefined_symbol_error(gsym));
7149 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7151 return tls_gd_to_le(relinfo, target, rela, r_type, view,
7154 else if (tlsopt == tls::TLSOPT_NONE)
7156 tls_got_offset_type = GOT_TYPE_TLS_PAIR;
7157 // Firstly get the address for the got entry.
7158 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7161 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7162 got_entry_address = target->got_->address() +
7163 gsym->got_offset(tls_got_offset_type);
7167 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7169 object->local_has_got_offset(r_sym, tls_got_offset_type));
7170 got_entry_address = target->got_->address() +
7171 object->local_got_offset(r_sym, tls_got_offset_type);
7174 // Relocate the address into adrp/ld, adrp/add pair.
7177 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7178 return aarch64_reloc_funcs::adrp(
7179 view, got_entry_address + addend, address);
7183 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
7184 return aarch64_reloc_funcs::template rela_general<32>(
7185 view, got_entry_address, addend, reloc_property);
7192 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7193 _("unsupported gd_to_ie relaxation on %u"),
7198 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7199 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic
7201 if (tlsopt == tls::TLSOPT_TO_LE)
7203 if (tls_segment == NULL)
7205 gold_assert(parameters->errors()->error_count() > 0
7206 || issue_undefined_symbol_error(gsym));
7207 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7209 return this->tls_ld_to_le(relinfo, target, rela, r_type, view,
7213 gold_assert(tlsopt == tls::TLSOPT_NONE);
7214 // Relocate the field with the offset of the GOT entry for
7215 // the module index.
7216 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7217 got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) +
7218 target->got_->address());
7222 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7223 return aarch64_reloc_funcs::adrp(
7224 view, got_entry_address + addend, address);
7227 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
7228 return aarch64_reloc_funcs::template rela_general<32>(
7229 view, got_entry_address, addend, reloc_property);
7238 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7239 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7240 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7241 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic
7243 AArch64_address value = psymval->value(object, 0);
7244 if (tlsopt == tls::TLSOPT_TO_LE)
7246 if (tls_segment == NULL)
7248 gold_assert(parameters->errors()->error_count() > 0
7249 || issue_undefined_symbol_error(gsym));
7250 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7255 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7256 return aarch64_reloc_funcs::movnz(view, value + addend,
7260 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7261 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7262 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
7263 return aarch64_reloc_funcs::template rela_general<32>(
7264 view, value, addend, reloc_property);
7270 // We should never reach here.
7274 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7275 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec
7277 if (tlsopt == tls::TLSOPT_TO_LE)
7279 if (tls_segment == NULL)
7281 gold_assert(parameters->errors()->error_count() > 0
7282 || issue_undefined_symbol_error(gsym));
7283 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7285 return tls_ie_to_le(relinfo, target, rela, r_type, view,
7288 tls_got_offset_type = GOT_TYPE_TLS_OFFSET;
7290 // Firstly get the address for the got entry.
7291 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7294 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7295 got_entry_address = target->got_->address() +
7296 gsym->got_offset(tls_got_offset_type);
7300 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7302 object->local_has_got_offset(r_sym, tls_got_offset_type));
7303 got_entry_address = target->got_->address() +
7304 object->local_got_offset(r_sym, tls_got_offset_type);
7306 // Relocate the address into adrp/ld, adrp/add pair.
7309 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7310 return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
7313 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
7314 return aarch64_reloc_funcs::template rela_general<32>(
7315 view, got_entry_address, addend, reloc_property);
7320 // We shall never reach here.
7323 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7324 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7325 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
7326 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7327 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
7328 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
7329 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
7330 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
7332 gold_assert(tls_segment != NULL);
7333 AArch64_address value = psymval->value(object, 0);
7335 if (!parameters->options().shared())
7337 AArch64_address aligned_tcb_size =
7338 align_address(target->tcb_size(),
7339 tls_segment->maximum_alignment());
7340 value += aligned_tcb_size;
7343 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7344 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7345 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7346 return aarch64_reloc_funcs::movnz(view, value + addend,
7349 return aarch64_reloc_funcs::template
7350 rela_general<32>(view,
7357 gold_error(_("%s: unsupported reloc %u "
7358 "in non-static TLSLE mode."),
7359 object->name().c_str(), r_type);
7363 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7364 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7365 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7366 case elfcpp::R_AARCH64_TLSDESC_CALL:
7368 if (tlsopt == tls::TLSOPT_TO_LE)
7370 if (tls_segment == NULL)
7372 gold_assert(parameters->errors()->error_count() > 0
7373 || issue_undefined_symbol_error(gsym));
7374 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7376 return tls_desc_gd_to_le(relinfo, target, rela, r_type,
7381 tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE
7382 ? GOT_TYPE_TLS_OFFSET
7383 : GOT_TYPE_TLS_DESC);
7384 unsigned int got_tlsdesc_offset = 0;
7385 if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL
7386 && tlsopt == tls::TLSOPT_NONE)
7388 // We created GOT entries in the .got.tlsdesc portion of the
7389 // .got.plt section, but the offset stored in the symbol is the
7390 // offset within .got.tlsdesc.
7391 got_tlsdesc_offset = (target->got_->data_size()
7392 + target->got_plt_section()->data_size());
7394 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7397 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7398 got_entry_address = target->got_->address()
7399 + got_tlsdesc_offset
7400 + gsym->got_offset(tls_got_offset_type);
7404 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7406 object->local_has_got_offset(r_sym, tls_got_offset_type));
7407 got_entry_address = target->got_->address() +
7408 got_tlsdesc_offset +
7409 object->local_got_offset(r_sym, tls_got_offset_type);
7411 if (tlsopt == tls::TLSOPT_TO_IE)
7413 if (tls_segment == NULL)
7415 gold_assert(parameters->errors()->error_count() > 0
7416 || issue_undefined_symbol_error(gsym));
7417 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7419 return tls_desc_gd_to_ie(relinfo, target, rela, r_type,
7420 view, psymval, got_entry_address,
7424 // Now do tlsdesc relocation.
7427 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7428 return aarch64_reloc_funcs::adrp(view,
7429 got_entry_address + addend,
7432 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7433 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7434 return aarch64_reloc_funcs::template rela_general<32>(
7435 view, got_entry_address, addend, reloc_property);
7437 case elfcpp::R_AARCH64_TLSDESC_CALL:
7438 return aarch64_reloc_funcs::STATUS_OKAY;
7448 gold_error(_("%s: unsupported TLS reloc %u."),
7449 object->name().c_str(), r_type);
7451 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7452 } // End of relocate_tls.
7455 template<int size, bool big_endian>
7457 typename AArch64_relocate_functions<size, big_endian>::Status
7458 Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le(
7459 const Relocate_info<size, big_endian>* relinfo,
7460 Target_aarch64<size, big_endian>* target,
7461 const elfcpp::Rela<size, big_endian>& rela,
7462 unsigned int r_type,
7463 unsigned char* view,
7464 const Symbol_value<size>* psymval)
7466 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7467 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7468 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7470 Insntype* ip = reinterpret_cast<Insntype*>(view);
7471 Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
7472 Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
7473 Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
7475 if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC)
7477 // This is the 2nd relocs, optimization should already have been
7479 gold_assert((insn1 & 0xfff00000) == 0x91400000);
7480 return aarch64_reloc_funcs::STATUS_OKAY;
7483 // The original sequence is -
7484 // 90000000 adrp x0, 0 <main>
7485 // 91000000 add x0, x0, #0x0
7486 // 94000000 bl 0 <__tls_get_addr>
7487 // optimized to sequence -
7488 // d53bd040 mrs x0, tpidr_el0
7489 // 91400000 add x0, x0, #0x0, lsl #12
7490 // 91000000 add x0, x0, #0x0
7492 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7493 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7494 // have to change "bl tls_get_addr", which does not have a corresponding tls
7495 // relocation type. So before proceeding, we need to make sure compiler
7496 // does not change the sequence.
7497 if(!(insn1 == 0x90000000 // adrp x0,0
7498 && insn2 == 0x91000000 // add x0, x0, #0x0
7499 && insn3 == 0x94000000)) // bl 0
7501 // Ideally we should give up gd_to_le relaxation and do gd access.
7502 // However the gd_to_le relaxation decision has been made early
7503 // in the scan stage, where we did not allocate any GOT entry for
7504 // this symbol. Therefore we have to exit and report error now.
7505 gold_error(_("unexpected reloc insn sequence while relaxing "
7506 "tls gd to le for reloc %u."), r_type);
7507 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7511 insn1 = 0xd53bd040; // mrs x0, tpidr_el0
7512 insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12
7513 insn3 = 0x91000000; // add x0, x0, #0x0
7514 elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
7515 elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
7516 elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
7518 // Calculate tprel value.
7519 Output_segment* tls_segment = relinfo->layout->tls_segment();
7520 gold_assert(tls_segment != NULL);
7521 AArch64_address value = psymval->value(relinfo->object, 0);
7522 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7523 AArch64_address aligned_tcb_size =
7524 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7525 AArch64_address x = value + aligned_tcb_size;
7527 // After new insns are written, apply TLSLE relocs.
7528 const AArch64_reloc_property* rp1 =
7529 aarch64_reloc_property_table->get_reloc_property(
7530 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
7531 const AArch64_reloc_property* rp2 =
7532 aarch64_reloc_property_table->get_reloc_property(
7533 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
7534 gold_assert(rp1 != NULL && rp2 != NULL);
7536 typename aarch64_reloc_funcs::Status s1 =
7537 aarch64_reloc_funcs::template rela_general<32>(view + 4,
7541 if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
7544 typename aarch64_reloc_funcs::Status s2 =
7545 aarch64_reloc_funcs::template rela_general<32>(view + 8,
7550 this->skip_call_tls_get_addr_ = true;
7552 } // End of tls_gd_to_le
7555 template<int size, bool big_endian>
7557 typename AArch64_relocate_functions<size, big_endian>::Status
7558 Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le(
7559 const Relocate_info<size, big_endian>* relinfo,
7560 Target_aarch64<size, big_endian>* target,
7561 const elfcpp::Rela<size, big_endian>& rela,
7562 unsigned int r_type,
7563 unsigned char* view,
7564 const Symbol_value<size>* psymval)
7566 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7567 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7568 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7570 Insntype* ip = reinterpret_cast<Insntype*>(view);
7571 Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
7572 Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
7573 Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
7575 if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC)
7577 // This is the 2nd relocs, optimization should already have been
7579 gold_assert((insn1 & 0xfff00000) == 0x91400000);
7580 return aarch64_reloc_funcs::STATUS_OKAY;
7583 // The original sequence is -
7584 // 90000000 adrp x0, 0 <main>
7585 // 91000000 add x0, x0, #0x0
7586 // 94000000 bl 0 <__tls_get_addr>
7587 // optimized to sequence -
7588 // d53bd040 mrs x0, tpidr_el0
7589 // 91400000 add x0, x0, #0x0, lsl #12
7590 // 91000000 add x0, x0, #0x0
7592 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7593 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7594 // have to change "bl tls_get_addr", which does not have a corresponding tls
7595 // relocation type. So before proceeding, we need to make sure compiler
7596 // does not change the sequence.
7597 if(!(insn1 == 0x90000000 // adrp x0,0
7598 && insn2 == 0x91000000 // add x0, x0, #0x0
7599 && insn3 == 0x94000000)) // bl 0
7601 // Ideally we should give up gd_to_le relaxation and do gd access.
7602 // However the gd_to_le relaxation decision has been made early
7603 // in the scan stage, where we did not allocate any GOT entry for
7604 // this symbol. Therefore we have to exit and report error now.
7605 gold_error(_("unexpected reloc insn sequence while relaxing "
7606 "tls gd to le for reloc %u."), r_type);
7607 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7611 insn1 = 0xd53bd040; // mrs x0, tpidr_el0
7612 insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12
7613 insn3 = 0x91000000; // add x0, x0, #0x0
7614 elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
7615 elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
7616 elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
7618 // Calculate tprel value.
7619 Output_segment* tls_segment = relinfo->layout->tls_segment();
7620 gold_assert(tls_segment != NULL);
7621 AArch64_address value = psymval->value(relinfo->object, 0);
7622 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7623 AArch64_address aligned_tcb_size =
7624 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7625 AArch64_address x = value + aligned_tcb_size;
7627 // After new insns are written, apply TLSLE relocs.
7628 const AArch64_reloc_property* rp1 =
7629 aarch64_reloc_property_table->get_reloc_property(
7630 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
7631 const AArch64_reloc_property* rp2 =
7632 aarch64_reloc_property_table->get_reloc_property(
7633 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
7634 gold_assert(rp1 != NULL && rp2 != NULL);
7636 typename aarch64_reloc_funcs::Status s1 =
7637 aarch64_reloc_funcs::template rela_general<32>(view + 4,
7641 if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
7644 typename aarch64_reloc_funcs::Status s2 =
7645 aarch64_reloc_funcs::template rela_general<32>(view + 8,
7650 this->skip_call_tls_get_addr_ = true;
7653 } // End of tls_ld_to_le
7655 template<int size, bool big_endian>
7657 typename AArch64_relocate_functions<size, big_endian>::Status
7658 Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le(
7659 const Relocate_info<size, big_endian>* relinfo,
7660 Target_aarch64<size, big_endian>* target,
7661 const elfcpp::Rela<size, big_endian>& rela,
7662 unsigned int r_type,
7663 unsigned char* view,
7664 const Symbol_value<size>* psymval)
7666 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7667 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7668 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7670 AArch64_address value = psymval->value(relinfo->object, 0);
7671 Output_segment* tls_segment = relinfo->layout->tls_segment();
7672 AArch64_address aligned_tcb_address =
7673 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7674 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7675 AArch64_address x = value + addend + aligned_tcb_address;
7676 // "x" is the offset to tp, we can only do this if x is within
7677 // range [0, 2^32-1]
7678 if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0)))
7680 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7682 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7685 Insntype* ip = reinterpret_cast<Insntype*>(view);
7686 Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
7689 if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21)
7692 regno = (insn & 0x1f);
7693 newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5);
7695 else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC)
7698 regno = (insn & 0x1f);
7699 gold_assert(regno == ((insn >> 5) & 0x1f));
7700 newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5);
7705 elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7706 return aarch64_reloc_funcs::STATUS_OKAY;
7707 } // End of tls_ie_to_le
7710 template<int size, bool big_endian>
7712 typename AArch64_relocate_functions<size, big_endian>::Status
7713 Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le(
7714 const Relocate_info<size, big_endian>* relinfo,
7715 Target_aarch64<size, big_endian>* target,
7716 const elfcpp::Rela<size, big_endian>& rela,
7717 unsigned int r_type,
7718 unsigned char* view,
7719 const Symbol_value<size>* psymval)
7721 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7722 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7723 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7725 // TLSDESC-GD sequence is like:
7726 // adrp x0, :tlsdesc:v1
7727 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7728 // add x0, x0, :tlsdesc_lo12:v1
7731 // After desc_gd_to_le optimization, the sequence will be like:
7732 // movz x0, #0x0, lsl #16
7737 // Calculate tprel value.
7738 Output_segment* tls_segment = relinfo->layout->tls_segment();
7739 gold_assert(tls_segment != NULL);
7740 Insntype* ip = reinterpret_cast<Insntype*>(view);
7741 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7742 AArch64_address value = psymval->value(relinfo->object, addend);
7743 AArch64_address aligned_tcb_size =
7744 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7745 AArch64_address x = value + aligned_tcb_size;
7746 // x is the offset to tp, we can only do this if x is within range
7747 // [0, 2^32-1]. If x is out of range, fail and exit.
7748 if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0)
7750 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7751 "We Can't do gd_to_le relaxation.\n"), r_type);
7752 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7757 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7758 case elfcpp::R_AARCH64_TLSDESC_CALL:
7760 newinsn = 0xd503201f;
7763 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7765 newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5);
7768 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7770 newinsn = 0xf2800000 | ((x & 0xffff) << 5);
7774 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7778 elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7779 return aarch64_reloc_funcs::STATUS_OKAY;
7780 } // End of tls_desc_gd_to_le
7783 template<int size, bool big_endian>
7785 typename AArch64_relocate_functions<size, big_endian>::Status
7786 Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie(
7787 const Relocate_info<size, big_endian>* /* relinfo */,
7788 Target_aarch64<size, big_endian>* /* target */,
7789 const elfcpp::Rela<size, big_endian>& rela,
7790 unsigned int r_type,
7791 unsigned char* view,
7792 const Symbol_value<size>* /* psymval */,
7793 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address,
7794 typename elfcpp::Elf_types<size>::Elf_Addr address)
7796 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7797 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7799 // TLSDESC-GD sequence is like:
7800 // adrp x0, :tlsdesc:v1
7801 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7802 // add x0, x0, :tlsdesc_lo12:v1
7805 // After desc_gd_to_ie optimization, the sequence will be like:
7806 // adrp x0, :tlsie:v1
7807 // ldr x0, [x0, :tlsie_lo12:v1]
7811 Insntype* ip = reinterpret_cast<Insntype*>(view);
7812 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7816 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7817 case elfcpp::R_AARCH64_TLSDESC_CALL:
7819 newinsn = 0xd503201f;
7820 elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7823 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7825 return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
7830 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7832 // Set ldr target register to be x0.
7833 Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
7835 elfcpp::Swap<32, big_endian>::writeval(ip, insn);
7837 const AArch64_reloc_property* reloc_property =
7838 aarch64_reloc_property_table->get_reloc_property(
7839 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC);
7840 return aarch64_reloc_funcs::template rela_general<32>(
7841 view, got_entry_address, addend, reloc_property);
7846 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7850 return aarch64_reloc_funcs::STATUS_OKAY;
7851 } // End of tls_desc_gd_to_ie
7853 // Relocate section data.
7855 template<int size, bool big_endian>
7857 Target_aarch64<size, big_endian>::relocate_section(
7858 const Relocate_info<size, big_endian>* relinfo,
7859 unsigned int sh_type,
7860 const unsigned char* prelocs,
7862 Output_section* output_section,
7863 bool needs_special_offset_handling,
7864 unsigned char* view,
7865 typename elfcpp::Elf_types<size>::Elf_Addr address,
7866 section_size_type view_size,
7867 const Reloc_symbol_changes* reloc_symbol_changes)
7869 gold_assert(sh_type == elfcpp::SHT_RELA);
7870 typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate;
7871 gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA,
7872 AArch64_relocate, gold::Default_comdat_behavior>(
7878 needs_special_offset_handling,
7882 reloc_symbol_changes);
7885 // Return the size of a relocation while scanning during a relocatable
7888 template<int size, bool big_endian>
7890 Target_aarch64<size, big_endian>::Relocatable_size_for_reloc::
7895 // We will never support SHT_REL relocations.
7900 // Scan the relocs during a relocatable link.
7902 template<int size, bool big_endian>
7904 Target_aarch64<size, big_endian>::scan_relocatable_relocs(
7905 Symbol_table* symtab,
7907 Sized_relobj_file<size, big_endian>* object,
7908 unsigned int data_shndx,
7909 unsigned int sh_type,
7910 const unsigned char* prelocs,
7912 Output_section* output_section,
7913 bool needs_special_offset_handling,
7914 size_t local_symbol_count,
7915 const unsigned char* plocal_symbols,
7916 Relocatable_relocs* rr)
7918 gold_assert(sh_type == elfcpp::SHT_RELA);
7920 typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
7921 Relocatable_size_for_reloc> Scan_relocatable_relocs;
7923 gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA,
7924 Scan_relocatable_relocs>(
7932 needs_special_offset_handling,
7938 // Relocate a section during a relocatable link.
7940 template<int size, bool big_endian>
7942 Target_aarch64<size, big_endian>::relocate_relocs(
7943 const Relocate_info<size, big_endian>* relinfo,
7944 unsigned int sh_type,
7945 const unsigned char* prelocs,
7947 Output_section* output_section,
7948 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
7949 const Relocatable_relocs* rr,
7950 unsigned char* view,
7951 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
7952 section_size_type view_size,
7953 unsigned char* reloc_view,
7954 section_size_type reloc_view_size)
7956 gold_assert(sh_type == elfcpp::SHT_RELA);
7958 gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>(
7963 offset_in_output_section,
7973 // Return whether this is a 3-insn erratum sequence.
7975 template<int size, bool big_endian>
7977 Target_aarch64<size, big_endian>::is_erratum_843419_sequence(
7978 typename elfcpp::Swap<32,big_endian>::Valtype insn1,
7979 typename elfcpp::Swap<32,big_endian>::Valtype insn2,
7980 typename elfcpp::Swap<32,big_endian>::Valtype insn3)
7985 // The 2nd insn is a single register load or store; or register pair
7987 if (Insn_utilities::aarch64_mem_op_p(insn2, &rt1, &rt2, &pair, &load)
7988 && (!pair || (pair && !load)))
7990 // The 3rd insn is a load or store instruction from the "Load/store
7991 // register (unsigned immediate)" encoding class, using Rn as the
7992 // base address register.
7993 if (Insn_utilities::aarch64_ldst_uimm(insn3)
7994 && (Insn_utilities::aarch64_rn(insn3)
7995 == Insn_utilities::aarch64_rd(insn1)))
8002 // Return whether this is a 835769 sequence.
8003 // (Similarly implemented as in elfnn-aarch64.c.)
8005 template<int size, bool big_endian>
8007 Target_aarch64<size, big_endian>::is_erratum_835769_sequence(
8008 typename elfcpp::Swap<32,big_endian>::Valtype insn1,
8009 typename elfcpp::Swap<32,big_endian>::Valtype insn2)
8019 if (Insn_utilities::aarch64_mlxl(insn2)
8020 && Insn_utilities::aarch64_mem_op_p (insn1, &rt, &rt2, &pair, &load))
8022 /* Any SIMD memory op is independent of the subsequent MLA
8023 by definition of the erratum. */
8024 if (Insn_utilities::aarch64_bit(insn1, 26))
8027 /* If not SIMD, check for integer memory ops and MLA relationship. */
8028 rn = Insn_utilities::aarch64_rn(insn2);
8029 ra = Insn_utilities::aarch64_ra(insn2);
8030 rm = Insn_utilities::aarch64_rm(insn2);
8032 /* If this is a load and there's a true(RAW) dependency, we are safe
8033 and this is not an erratum sequence. */
8035 (rt == rn || rt == rm || rt == ra
8036 || (pair && (rt2 == rn || rt2 == rm || rt2 == ra))))
8039 /* We conservatively put out stubs for all other cases (including
8048 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8050 template<int size, bool big_endian>
8052 Target_aarch64<size, big_endian>::create_erratum_stub(
8053 AArch64_relobj<size, big_endian>* relobj,
8055 section_size_type erratum_insn_offset,
8056 Address erratum_address,
8057 typename Insn_utilities::Insntype erratum_insn,
8059 unsigned int e843419_adrp_offset)
8061 gold_assert(erratum_type == ST_E_843419 || erratum_type == ST_E_835769);
8062 The_stub_table* stub_table = relobj->stub_table(shndx);
8063 gold_assert(stub_table != NULL);
8064 if (stub_table->find_erratum_stub(relobj,
8066 erratum_insn_offset) == NULL)
8068 const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
8069 The_erratum_stub* stub;
8070 if (erratum_type == ST_E_835769)
8071 stub = new The_erratum_stub(relobj, erratum_type, shndx,
8072 erratum_insn_offset);
8073 else if (erratum_type == ST_E_843419)
8074 stub = new E843419_stub<size, big_endian>(
8075 relobj, shndx, erratum_insn_offset, e843419_adrp_offset);
8078 stub->set_erratum_insn(erratum_insn);
8079 stub->set_erratum_address(erratum_address);
8080 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8081 // always the next insn after erratum insn.
8082 stub->set_destination_address(erratum_address + BPI);
8083 stub_table->add_erratum_stub(stub);
8088 // Scan erratum for section SHNDX range [output_address + span_start,
8089 // output_address + span_end). Note here we do not share the code with
8090 // scan_erratum_843419_span function, because for 843419 we optimize by only
8091 // scanning the last few insns of a page, whereas for 835769, we need to scan
8094 template<int size, bool big_endian>
8096 Target_aarch64<size, big_endian>::scan_erratum_835769_span(
8097 AArch64_relobj<size, big_endian>* relobj,
8099 const section_size_type span_start,
8100 const section_size_type span_end,
8101 unsigned char* input_view,
8102 Address output_address)
8104 typedef typename Insn_utilities::Insntype Insntype;
8106 const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
8108 // Adjust output_address and view to the start of span.
8109 output_address += span_start;
8110 input_view += span_start;
8112 section_size_type span_length = span_end - span_start;
8113 section_size_type offset = 0;
8114 for (offset = 0; offset + BPI < span_length; offset += BPI)
8116 Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
8117 Insntype insn1 = ip[0];
8118 Insntype insn2 = ip[1];
8119 if (is_erratum_835769_sequence(insn1, insn2))
8121 Insntype erratum_insn = insn2;
8122 // "span_start + offset" is the offset for insn1. So for insn2, it is
8123 // "span_start + offset + BPI".
8124 section_size_type erratum_insn_offset = span_start + offset + BPI;
8125 Address erratum_address = output_address + offset + BPI;
8126 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8127 "section %d, offset 0x%08x."),
8128 relobj->name().c_str(), shndx,
8129 (unsigned int)(span_start + offset));
8131 this->create_erratum_stub(relobj, shndx,
8132 erratum_insn_offset, erratum_address,
8133 erratum_insn, ST_E_835769);
8134 offset += BPI; // Skip mac insn.
8137 } // End of "Target_aarch64::scan_erratum_835769_span".
8140 // Scan erratum for section SHNDX range
8141 // [output_address + span_start, output_address + span_end).
8143 template<int size, bool big_endian>
8145 Target_aarch64<size, big_endian>::scan_erratum_843419_span(
8146 AArch64_relobj<size, big_endian>* relobj,
8148 const section_size_type span_start,
8149 const section_size_type span_end,
8150 unsigned char* input_view,
8151 Address output_address)
8153 typedef typename Insn_utilities::Insntype Insntype;
8155 // Adjust output_address and view to the start of span.
8156 output_address += span_start;
8157 input_view += span_start;
8159 if ((output_address & 0x03) != 0)
8162 section_size_type offset = 0;
8163 section_size_type span_length = span_end - span_start;
8164 // The first instruction must be ending at 0xFF8 or 0xFFC.
8165 unsigned int page_offset = output_address & 0xFFF;
8166 // Make sure starting position, that is "output_address+offset",
8167 // starts at page position 0xff8 or 0xffc.
8168 if (page_offset < 0xff8)
8169 offset = 0xff8 - page_offset;
8170 while (offset + 3 * Insn_utilities::BYTES_PER_INSN <= span_length)
8172 Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
8173 Insntype insn1 = ip[0];
8174 if (Insn_utilities::is_adrp(insn1))
8176 Insntype insn2 = ip[1];
8177 Insntype insn3 = ip[2];
8178 Insntype erratum_insn;
8179 unsigned insn_offset;
8180 bool do_report = false;
8181 if (is_erratum_843419_sequence(insn1, insn2, insn3))
8184 erratum_insn = insn3;
8185 insn_offset = 2 * Insn_utilities::BYTES_PER_INSN;
8187 else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length)
8189 // Optionally we can have an insn between ins2 and ins3
8190 Insntype insn_opt = ip[2];
8191 // And insn_opt must not be a branch.
8192 if (!Insn_utilities::aarch64_b(insn_opt)
8193 && !Insn_utilities::aarch64_bl(insn_opt)
8194 && !Insn_utilities::aarch64_blr(insn_opt)
8195 && !Insn_utilities::aarch64_br(insn_opt))
8197 // And insn_opt must not write to dest reg in insn1. However
8198 // we do a conservative scan, which means we may fix/report
8199 // more than necessary, but it doesn't hurt.
8201 Insntype insn4 = ip[3];
8202 if (is_erratum_843419_sequence(insn1, insn2, insn4))
8205 erratum_insn = insn4;
8206 insn_offset = 3 * Insn_utilities::BYTES_PER_INSN;
8212 gold_info(_("Erratum 843419 found and fixed at \"%s\", "
8213 "section %d, offset 0x%08x."),
8214 relobj->name().c_str(), shndx,
8215 (unsigned int)(span_start + offset));
8216 unsigned int erratum_insn_offset =
8217 span_start + offset + insn_offset;
8218 Address erratum_address =
8219 output_address + offset + insn_offset;
8220 create_erratum_stub(relobj, shndx,
8221 erratum_insn_offset, erratum_address,
8222 erratum_insn, ST_E_843419,
8223 span_start + offset);
8227 // Advance to next candidate instruction. We only consider instruction
8228 // sequences starting at a page offset of 0xff8 or 0xffc.
8229 page_offset = (output_address + offset) & 0xfff;
8230 if (page_offset == 0xff8)
8232 else // (page_offset == 0xffc), we move to next page's 0xff8.
8235 } // End of "Target_aarch64::scan_erratum_843419_span".
8238 // The selector for aarch64 object files.
8240 template<int size, bool big_endian>
8241 class Target_selector_aarch64 : public Target_selector
8244 Target_selector_aarch64();
8247 do_instantiate_target()
8248 { return new Target_aarch64<size, big_endian>(); }
8252 Target_selector_aarch64<32, true>::Target_selector_aarch64()
8253 : Target_selector(elfcpp::EM_AARCH64, 32, true,
8254 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8258 Target_selector_aarch64<32, false>::Target_selector_aarch64()
8259 : Target_selector(elfcpp::EM_AARCH64, 32, false,
8260 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8264 Target_selector_aarch64<64, true>::Target_selector_aarch64()
8265 : Target_selector(elfcpp::EM_AARCH64, 64, true,
8266 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8270 Target_selector_aarch64<64, false>::Target_selector_aarch64()
8271 : Target_selector(elfcpp::EM_AARCH64, 64, false,
8272 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8275 Target_selector_aarch64<32, true> target_selector_aarch64elf32b;
8276 Target_selector_aarch64<32, false> target_selector_aarch64elf32;
8277 Target_selector_aarch64<64, true> target_selector_aarch64elfb;
8278 Target_selector_aarch64<64, false> target_selector_aarch64elf;
8280 } // End anonymous namespace.