1 // aarch64.cc -- aarch64 target support for gold.
3 // Copyright (C) 2014-2017 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 is_mrs_tpidr_el0(const Insntype insn)
115 { return (insn & 0xFFFFFFE0) == 0xd53bd040; }
118 aarch64_rm(const Insntype insn)
119 { return aarch64_bits(insn, 16, 5); }
122 aarch64_rn(const Insntype insn)
123 { return aarch64_bits(insn, 5, 5); }
126 aarch64_rd(const Insntype insn)
127 { return aarch64_bits(insn, 0, 5); }
130 aarch64_rt(const Insntype insn)
131 { return aarch64_bits(insn, 0, 5); }
134 aarch64_rt2(const Insntype insn)
135 { return aarch64_bits(insn, 10, 5); }
137 // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M).
139 aarch64_adr_encode_imm(Insntype adr, int imm21)
141 gold_assert(is_adr(adr));
142 gold_assert(-(1 << 20) <= imm21 && imm21 < (1 << 20));
143 const int mask19 = (1 << 19) - 1;
145 adr &= ~((mask19 << 5) | (mask2 << 29));
146 adr |= ((imm21 & mask2) << 29) | (((imm21 >> 2) & mask19) << 5);
150 // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by
151 // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and
152 // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0.
154 aarch64_adrp_decode_imm(const Insntype adrp)
156 const int mask19 = (1 << 19) - 1;
158 gold_assert(is_adrp(adrp));
159 // 21-bit imm encoded in adrp.
160 uint64_t imm = ((adrp >> 29) & mask2) | (((adrp >> 5) & mask19) << 2);
161 // Retrieve msb of 21-bit-signed imm for sign extension.
162 uint64_t msbt = (imm >> 20) & 1;
163 // Real value is imm multiplied by 4k. Value now has 33-bit information.
164 int64_t value = imm << 12;
165 // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it
167 return ((((uint64_t)(1) << 32) - msbt) << 33) | value;
171 aarch64_b(const Insntype insn)
172 { return (insn & 0xFC000000) == 0x14000000; }
175 aarch64_bl(const Insntype insn)
176 { return (insn & 0xFC000000) == 0x94000000; }
179 aarch64_blr(const Insntype insn)
180 { return (insn & 0xFFFFFC1F) == 0xD63F0000; }
183 aarch64_br(const Insntype insn)
184 { return (insn & 0xFFFFFC1F) == 0xD61F0000; }
186 // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for
187 // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops.
189 aarch64_ld(Insntype insn) { return aarch64_bit(insn, 22) == 1; }
192 aarch64_ldst(Insntype insn)
193 { return (insn & 0x0a000000) == 0x08000000; }
196 aarch64_ldst_ex(Insntype insn)
197 { return (insn & 0x3f000000) == 0x08000000; }
200 aarch64_ldst_pcrel(Insntype insn)
201 { return (insn & 0x3b000000) == 0x18000000; }
204 aarch64_ldst_nap(Insntype insn)
205 { return (insn & 0x3b800000) == 0x28000000; }
208 aarch64_ldstp_pi(Insntype insn)
209 { return (insn & 0x3b800000) == 0x28800000; }
212 aarch64_ldstp_o(Insntype insn)
213 { return (insn & 0x3b800000) == 0x29000000; }
216 aarch64_ldstp_pre(Insntype insn)
217 { return (insn & 0x3b800000) == 0x29800000; }
220 aarch64_ldst_ui(Insntype insn)
221 { return (insn & 0x3b200c00) == 0x38000000; }
224 aarch64_ldst_piimm(Insntype insn)
225 { return (insn & 0x3b200c00) == 0x38000400; }
228 aarch64_ldst_u(Insntype insn)
229 { return (insn & 0x3b200c00) == 0x38000800; }
232 aarch64_ldst_preimm(Insntype insn)
233 { return (insn & 0x3b200c00) == 0x38000c00; }
236 aarch64_ldst_ro(Insntype insn)
237 { return (insn & 0x3b200c00) == 0x38200800; }
240 aarch64_ldst_uimm(Insntype insn)
241 { return (insn & 0x3b000000) == 0x39000000; }
244 aarch64_ldst_simd_m(Insntype insn)
245 { return (insn & 0xbfbf0000) == 0x0c000000; }
248 aarch64_ldst_simd_m_pi(Insntype insn)
249 { return (insn & 0xbfa00000) == 0x0c800000; }
252 aarch64_ldst_simd_s(Insntype insn)
253 { return (insn & 0xbf9f0000) == 0x0d000000; }
256 aarch64_ldst_simd_s_pi(Insntype insn)
257 { return (insn & 0xbf800000) == 0x0d800000; }
259 // Classify an INSN if it is indeed a load/store. Return true if INSN is a
260 // LD/ST instruction otherwise return false. For scalar LD/ST instructions
261 // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair
262 // instructions PAIR is TRUE, RT and RT2 are returned.
264 aarch64_mem_op_p(Insntype insn, unsigned int *rt, unsigned int *rt2,
265 bool *pair, bool *load)
273 /* Bail out quickly if INSN doesn't fall into the the load-store
275 if (!aarch64_ldst (insn))
280 if (aarch64_ldst_ex (insn))
282 *rt = aarch64_rt (insn);
284 if (aarch64_bit (insn, 21) == 1)
287 *rt2 = aarch64_rt2 (insn);
289 *load = aarch64_ld (insn);
292 else if (aarch64_ldst_nap (insn)
293 || aarch64_ldstp_pi (insn)
294 || aarch64_ldstp_o (insn)
295 || aarch64_ldstp_pre (insn))
298 *rt = aarch64_rt (insn);
299 *rt2 = aarch64_rt2 (insn);
300 *load = aarch64_ld (insn);
303 else if (aarch64_ldst_pcrel (insn)
304 || aarch64_ldst_ui (insn)
305 || aarch64_ldst_piimm (insn)
306 || aarch64_ldst_u (insn)
307 || aarch64_ldst_preimm (insn)
308 || aarch64_ldst_ro (insn)
309 || aarch64_ldst_uimm (insn))
311 *rt = aarch64_rt (insn);
313 if (aarch64_ldst_pcrel (insn))
315 opc = aarch64_bits (insn, 22, 2);
316 v = aarch64_bit (insn, 26);
317 opc_v = opc | (v << 2);
318 *load = (opc_v == 1 || opc_v == 2 || opc_v == 3
319 || opc_v == 5 || opc_v == 7);
322 else if (aarch64_ldst_simd_m (insn)
323 || aarch64_ldst_simd_m_pi (insn))
325 *rt = aarch64_rt (insn);
326 *load = aarch64_bit (insn, 22);
327 opcode = (insn >> 12) & 0xf;
354 else if (aarch64_ldst_simd_s (insn)
355 || aarch64_ldst_simd_s_pi (insn))
357 *rt = aarch64_rt (insn);
358 r = (insn >> 21) & 1;
359 *load = aarch64_bit (insn, 22);
360 opcode = (insn >> 13) & 0x7;
372 *rt2 = *rt + (r == 0 ? 2 : 3);
380 *rt2 = *rt + (r == 0 ? 2 : 3);
389 } // End of "aarch64_mem_op_p".
391 // Return true if INSN is mac insn.
393 aarch64_mac(Insntype insn)
394 { return (insn & 0xff000000) == 0x9b000000; }
396 // Return true if INSN is multiply-accumulate.
397 // (This is similar to implementaton in elfnn-aarch64.c.)
399 aarch64_mlxl(Insntype insn)
401 uint32_t op31 = aarch64_op31(insn);
402 if (aarch64_mac(insn)
403 && (op31 == 0 || op31 == 1 || op31 == 5)
404 /* Exclude MUL instructions which are encoded as a multiple-accumulate
406 && aarch64_ra(insn) != AARCH64_ZR)
412 }; // End of "AArch64_insn_utilities".
415 // Insn length in byte.
417 template<bool big_endian>
418 const int AArch64_insn_utilities<big_endian>::BYTES_PER_INSN = 4;
421 // Zero register encoding - 31.
423 template<bool big_endian>
424 const unsigned int AArch64_insn_utilities<big_endian>::AARCH64_ZR = 0x1f;
427 // Output_data_got_aarch64 class.
429 template<int size, bool big_endian>
430 class Output_data_got_aarch64 : public Output_data_got<size, big_endian>
433 typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype;
434 Output_data_got_aarch64(Symbol_table* symtab, Layout* layout)
435 : Output_data_got<size, big_endian>(),
436 symbol_table_(symtab), layout_(layout)
439 // Add a static entry for the GOT entry at OFFSET. GSYM is a global
440 // symbol and R_TYPE is the code of a dynamic relocation that needs to be
441 // applied in a static link.
443 add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
444 { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); }
447 // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object
448 // defining a local symbol with INDEX. R_TYPE is the code of a dynamic
449 // relocation that needs to be applied in a static link.
451 add_static_reloc(unsigned int got_offset, unsigned int r_type,
452 Sized_relobj_file<size, big_endian>* relobj,
455 this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj,
461 // Write out the GOT table.
463 do_write(Output_file* of) {
464 // The first entry in the GOT is the address of the .dynamic section.
465 gold_assert(this->data_size() >= size / 8);
466 Output_section* dynamic = this->layout_->dynamic_section();
467 Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
468 this->replace_constant(0, dynamic_addr);
469 Output_data_got<size, big_endian>::do_write(of);
471 // Handling static relocs
472 if (this->static_relocs_.empty())
475 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
477 gold_assert(parameters->doing_static_link());
478 const off_t offset = this->offset();
479 const section_size_type oview_size =
480 convert_to_section_size_type(this->data_size());
481 unsigned char* const oview = of->get_output_view(offset, oview_size);
483 Output_segment* tls_segment = this->layout_->tls_segment();
484 gold_assert(tls_segment != NULL);
486 AArch64_address aligned_tcb_address =
487 align_address(Target_aarch64<size, big_endian>::TCB_SIZE,
488 tls_segment->maximum_alignment());
490 for (size_t i = 0; i < this->static_relocs_.size(); ++i)
492 Static_reloc& reloc(this->static_relocs_[i]);
493 AArch64_address value;
495 if (!reloc.symbol_is_global())
497 Sized_relobj_file<size, big_endian>* object = reloc.relobj();
498 const Symbol_value<size>* psymval =
499 reloc.relobj()->local_symbol(reloc.index());
501 // We are doing static linking. Issue an error and skip this
502 // relocation if the symbol is undefined or in a discarded_section.
504 unsigned int shndx = psymval->input_shndx(&is_ordinary);
505 if ((shndx == elfcpp::SHN_UNDEF)
507 && shndx != elfcpp::SHN_UNDEF
508 && !object->is_section_included(shndx)
509 && !this->symbol_table_->is_section_folded(object, shndx)))
511 gold_error(_("undefined or discarded local symbol %u from "
512 " object %s in GOT"),
513 reloc.index(), reloc.relobj()->name().c_str());
516 value = psymval->value(object, 0);
520 const Symbol* gsym = reloc.symbol();
521 gold_assert(gsym != NULL);
522 if (gsym->is_forwarder())
523 gsym = this->symbol_table_->resolve_forwards(gsym);
525 // We are doing static linking. Issue an error and skip this
526 // relocation if the symbol is undefined or in a discarded_section
527 // unless it is a weakly_undefined symbol.
528 if ((gsym->is_defined_in_discarded_section()
529 || gsym->is_undefined())
530 && !gsym->is_weak_undefined())
532 gold_error(_("undefined or discarded symbol %s in GOT"),
537 if (!gsym->is_weak_undefined())
539 const Sized_symbol<size>* sym =
540 static_cast<const Sized_symbol<size>*>(gsym);
541 value = sym->value();
547 unsigned got_offset = reloc.got_offset();
548 gold_assert(got_offset < oview_size);
550 typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype;
551 Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset);
553 switch (reloc.r_type())
555 case elfcpp::R_AARCH64_TLS_DTPREL64:
558 case elfcpp::R_AARCH64_TLS_TPREL64:
559 x = value + aligned_tcb_address;
564 elfcpp::Swap<size, big_endian>::writeval(wv, x);
567 of->write_output_view(offset, oview_size, oview);
571 // Symbol table of the output object.
572 Symbol_table* symbol_table_;
573 // A pointer to the Layout class, so that we can find the .dynamic
574 // section when we write out the GOT section.
577 // This class represent dynamic relocations that need to be applied by
578 // gold because we are using TLS relocations in a static link.
582 Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym)
583 : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true)
584 { this->u_.global.symbol = gsym; }
586 Static_reloc(unsigned int got_offset, unsigned int r_type,
587 Sized_relobj_file<size, big_endian>* relobj, unsigned int index)
588 : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false)
590 this->u_.local.relobj = relobj;
591 this->u_.local.index = index;
594 // Return the GOT offset.
597 { return this->got_offset_; }
602 { return this->r_type_; }
604 // Whether the symbol is global or not.
606 symbol_is_global() const
607 { return this->symbol_is_global_; }
609 // For a relocation against a global symbol, the global symbol.
613 gold_assert(this->symbol_is_global_);
614 return this->u_.global.symbol;
617 // For a relocation against a local symbol, the defining object.
618 Sized_relobj_file<size, big_endian>*
621 gold_assert(!this->symbol_is_global_);
622 return this->u_.local.relobj;
625 // For a relocation against a local symbol, the local symbol index.
629 gold_assert(!this->symbol_is_global_);
630 return this->u_.local.index;
634 // GOT offset of the entry to which this relocation is applied.
635 unsigned int got_offset_;
636 // Type of relocation.
637 unsigned int r_type_;
638 // Whether this relocation is against a global symbol.
639 bool symbol_is_global_;
640 // A global or local symbol.
645 // For a global symbol, the symbol itself.
650 // For a local symbol, the object defining the symbol.
651 Sized_relobj_file<size, big_endian>* relobj;
652 // For a local symbol, the symbol index.
656 }; // End of inner class Static_reloc
658 std::vector<Static_reloc> static_relocs_;
659 }; // End of Output_data_got_aarch64
662 template<int size, bool big_endian>
663 class AArch64_input_section;
666 template<int size, bool big_endian>
667 class AArch64_output_section;
670 template<int size, bool big_endian>
671 class AArch64_relobj;
674 // Stub type enum constants.
680 // Using adrp/add pair, 4 insns (including alignment) without mem access,
681 // the fastest stub. This has a limited jump distance, which is tested by
682 // aarch64_valid_for_adrp_p.
685 // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
686 // unlimited in jump distance.
687 ST_LONG_BRANCH_ABS = 2,
689 // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1
690 // mem access, slowest one. Only used in position independent executables.
691 ST_LONG_BRANCH_PCREL = 3,
693 // Stub for erratum 843419 handling.
696 // Stub for erratum 835769 handling.
699 // Number of total stub types.
704 // Struct that wraps insns for a particular stub. All stub templates are
705 // created/initialized as constants by Stub_template_repertoire.
707 template<bool big_endian>
710 const typename AArch64_insn_utilities<big_endian>::Insntype* insns;
715 // Simple singleton class that creates/initializes/stores all types of stub
718 template<bool big_endian>
719 class Stub_template_repertoire
722 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
724 // Single static method to get stub template for a given stub type.
725 static const Stub_template<big_endian>*
726 get_stub_template(int type)
728 static Stub_template_repertoire<big_endian> singleton;
729 return singleton.stub_templates_[type];
733 // Constructor - creates/initializes all stub templates.
734 Stub_template_repertoire();
735 ~Stub_template_repertoire()
738 // Disallowing copy ctor and copy assignment operator.
739 Stub_template_repertoire(Stub_template_repertoire&);
740 Stub_template_repertoire& operator=(Stub_template_repertoire&);
742 // Data that stores all insn templates.
743 const Stub_template<big_endian>* stub_templates_[ST_NUMBER];
744 }; // End of "class Stub_template_repertoire".
747 // Constructor - creates/initilizes all stub templates.
749 template<bool big_endian>
750 Stub_template_repertoire<big_endian>::Stub_template_repertoire()
752 // Insn array definitions.
753 const static Insntype ST_NONE_INSNS[] = {};
755 const static Insntype ST_ADRP_BRANCH_INSNS[] =
757 0x90000010, /* adrp ip0, X */
758 /* ADR_PREL_PG_HI21(X) */
759 0x91000210, /* add ip0, ip0, :lo12:X */
760 /* ADD_ABS_LO12_NC(X) */
761 0xd61f0200, /* br ip0 */
762 0x00000000, /* alignment padding */
765 const static Insntype ST_LONG_BRANCH_ABS_INSNS[] =
767 0x58000050, /* ldr ip0, 0x8 */
768 0xd61f0200, /* br ip0 */
769 0x00000000, /* address field */
770 0x00000000, /* address fields */
773 const static Insntype ST_LONG_BRANCH_PCREL_INSNS[] =
775 0x58000090, /* ldr ip0, 0x10 */
776 0x10000011, /* adr ip1, #0 */
777 0x8b110210, /* add ip0, ip0, ip1 */
778 0xd61f0200, /* br ip0 */
779 0x00000000, /* address field */
780 0x00000000, /* address field */
781 0x00000000, /* alignment padding */
782 0x00000000, /* alignment padding */
785 const static Insntype ST_E_843419_INSNS[] =
787 0x00000000, /* Placeholder for erratum insn. */
788 0x14000000, /* b <label> */
791 // ST_E_835769 has the same stub template as ST_E_843419
792 // but we reproduce the array here so that the sizeof
793 // expressions in install_insn_template will work.
794 const static Insntype ST_E_835769_INSNS[] =
796 0x00000000, /* Placeholder for erratum insn. */
797 0x14000000, /* b <label> */
800 #define install_insn_template(T) \
801 const static Stub_template<big_endian> template_##T = { \
802 T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \
803 this->stub_templates_[T] = &template_##T
805 install_insn_template(ST_NONE);
806 install_insn_template(ST_ADRP_BRANCH);
807 install_insn_template(ST_LONG_BRANCH_ABS);
808 install_insn_template(ST_LONG_BRANCH_PCREL);
809 install_insn_template(ST_E_843419);
810 install_insn_template(ST_E_835769);
812 #undef install_insn_template
816 // Base class for stubs.
818 template<int size, bool big_endian>
822 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
823 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
825 static const AArch64_address invalid_address =
826 static_cast<AArch64_address>(-1);
828 static const section_offset_type invalid_offset =
829 static_cast<section_offset_type>(-1);
832 : destination_address_(invalid_address),
833 offset_(invalid_offset),
843 { return this->type_; }
845 // Get stub template that provides stub insn information.
846 const Stub_template<big_endian>*
847 stub_template() const
849 return Stub_template_repertoire<big_endian>::
850 get_stub_template(this->type());
853 // Get destination address.
855 destination_address() const
857 gold_assert(this->destination_address_ != this->invalid_address);
858 return this->destination_address_;
861 // Set destination address.
863 set_destination_address(AArch64_address address)
865 gold_assert(address != this->invalid_address);
866 this->destination_address_ = address;
869 // Reset the destination address.
871 reset_destination_address()
872 { this->destination_address_ = this->invalid_address; }
874 // Get offset of code stub. For Reloc_stub, it is the offset from the
875 // beginning of its containing stub table; for Erratum_stub, it is the offset
876 // from the end of reloc_stubs.
880 gold_assert(this->offset_ != this->invalid_offset);
881 return this->offset_;
886 set_offset(section_offset_type offset)
887 { this->offset_ = offset; }
889 // Return the stub insn.
892 { return this->stub_template()->insns; }
894 // Return num of stub insns.
897 { return this->stub_template()->insn_num; }
899 // Get size of the stub.
903 return this->insn_num() *
904 AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
907 // Write stub to output file.
909 write(unsigned char* view, section_size_type view_size)
910 { this->do_write(view, view_size); }
913 // Abstract method to be implemented by sub-classes.
915 do_write(unsigned char*, section_size_type) = 0;
918 // The last insn of a stub is a jump to destination insn. This field records
919 // the destination address.
920 AArch64_address destination_address_;
921 // The stub offset. Note this has difference interpretations between an
922 // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the
923 // beginning of the containing stub_table, whereas for Erratum_stub, this is
924 // the offset from the end of reloc_stubs.
925 section_offset_type offset_;
928 }; // End of "Stub_base".
931 // Erratum stub class. An erratum stub differs from a reloc stub in that for
932 // each erratum occurrence, we generate an erratum stub. We never share erratum
933 // stubs, whereas for reloc stubs, different branches insns share a single reloc
934 // stub as long as the branch targets are the same. (More to the point, reloc
935 // stubs can be shared because they're used to reach a specific target, whereas
936 // erratum stubs branch back to the original control flow.)
938 template<int size, bool big_endian>
939 class Erratum_stub : public Stub_base<size, big_endian>
942 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
943 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
944 typedef AArch64_insn_utilities<big_endian> Insn_utilities;
945 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
947 static const int STUB_ADDR_ALIGN;
949 static const Insntype invalid_insn = static_cast<Insntype>(-1);
951 Erratum_stub(The_aarch64_relobj* relobj, int type,
952 unsigned shndx, unsigned int sh_offset)
953 : Stub_base<size, big_endian>(type), relobj_(relobj),
954 shndx_(shndx), sh_offset_(sh_offset),
955 erratum_insn_(invalid_insn),
956 erratum_address_(this->invalid_address)
961 // Return the object that contains the erratum.
964 { return this->relobj_; }
966 // Get section index of the erratum.
969 { return this->shndx_; }
971 // Get section offset of the erratum.
974 { return this->sh_offset_; }
976 // Get the erratum insn. This is the insn located at erratum_insn_address.
980 gold_assert(this->erratum_insn_ != this->invalid_insn);
981 return this->erratum_insn_;
984 // Set the insn that the erratum happens to.
986 set_erratum_insn(Insntype insn)
987 { this->erratum_insn_ = insn; }
989 // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a
990 // relocation spot, in this case, the erratum_insn_ recorded at scanning phase
991 // is no longer the one we want to write out to the stub, update erratum_insn_
992 // with relocated version. Also note that in this case xn must not be "PC", so
993 // it is safe to move the erratum insn from the origin place to the stub. For
994 // 835769, the erratum insn is multiply-accumulate insn, which could not be a
995 // relocation spot (assertion added though).
997 update_erratum_insn(Insntype insn)
999 gold_assert(this->erratum_insn_ != this->invalid_insn);
1000 switch (this->type())
1003 gold_assert(Insn_utilities::aarch64_ldst_uimm(insn));
1004 gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn()));
1005 gold_assert(Insn_utilities::aarch64_rd(insn) ==
1006 Insn_utilities::aarch64_rd(this->erratum_insn()));
1007 gold_assert(Insn_utilities::aarch64_rn(insn) ==
1008 Insn_utilities::aarch64_rn(this->erratum_insn()));
1009 // Update plain ld/st insn with relocated insn.
1010 this->erratum_insn_ = insn;
1013 gold_assert(insn == this->erratum_insn());
1021 // Return the address where an erratum must be done.
1023 erratum_address() const
1025 gold_assert(this->erratum_address_ != this->invalid_address);
1026 return this->erratum_address_;
1029 // Set the address where an erratum must be done.
1031 set_erratum_address(AArch64_address addr)
1032 { this->erratum_address_ = addr; }
1034 // Comparator used to group Erratum_stubs in a set by (obj, shndx,
1035 // sh_offset). We do not include 'type' in the calculation, because there is
1036 // at most one stub type at (obj, shndx, sh_offset).
1038 operator<(const Erratum_stub<size, big_endian>& k) const
1042 // We group stubs by relobj.
1043 if (this->relobj_ != k.relobj_)
1044 return this->relobj_ < k.relobj_;
1045 // Then by section index.
1046 if (this->shndx_ != k.shndx_)
1047 return this->shndx_ < k.shndx_;
1048 // Lastly by section offset.
1049 return this->sh_offset_ < k.sh_offset_;
1054 do_write(unsigned char*, section_size_type);
1057 // The object that needs to be fixed.
1058 The_aarch64_relobj* relobj_;
1059 // The shndx in the object that needs to be fixed.
1060 const unsigned int shndx_;
1061 // The section offset in the obejct that needs to be fixed.
1062 const unsigned int sh_offset_;
1063 // The insn to be fixed.
1064 Insntype erratum_insn_;
1065 // The address of the above insn.
1066 AArch64_address erratum_address_;
1067 }; // End of "Erratum_stub".
1070 // Erratum sub class to wrap additional info needed by 843419. In fixing this
1071 // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need
1072 // adrp's code position (two or three insns before erratum insn itself).
1074 template<int size, bool big_endian>
1075 class E843419_stub : public Erratum_stub<size, big_endian>
1078 typedef typename AArch64_insn_utilities<big_endian>::Insntype Insntype;
1080 E843419_stub(AArch64_relobj<size, big_endian>* relobj,
1081 unsigned int shndx, unsigned int sh_offset,
1082 unsigned int adrp_sh_offset)
1083 : Erratum_stub<size, big_endian>(relobj, ST_E_843419, shndx, sh_offset),
1084 adrp_sh_offset_(adrp_sh_offset)
1088 adrp_sh_offset() const
1089 { return this->adrp_sh_offset_; }
1092 // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we
1093 // can can obtain it from its parent.)
1094 const unsigned int adrp_sh_offset_;
1098 template<int size, bool big_endian>
1099 const int Erratum_stub<size, big_endian>::STUB_ADDR_ALIGN = 4;
1101 // Comparator used in set definition.
1102 template<int size, bool big_endian>
1103 struct Erratum_stub_less
1106 operator()(const Erratum_stub<size, big_endian>* s1,
1107 const Erratum_stub<size, big_endian>* s2) const
1108 { return *s1 < *s2; }
1111 // Erratum_stub implementation for writing stub to output file.
1113 template<int size, bool big_endian>
1115 Erratum_stub<size, big_endian>::do_write(unsigned char* view, section_size_type)
1117 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
1118 const Insntype* insns = this->insns();
1119 uint32_t num_insns = this->insn_num();
1120 Insntype* ip = reinterpret_cast<Insntype*>(view);
1121 // For current implemented erratum 843419 and 835769, the first insn in the
1122 // stub is always a copy of the problematic insn (in 843419, the mem access
1123 // insn, in 835769, the mac insn), followed by a jump-back.
1124 elfcpp::Swap<32, big_endian>::writeval(ip, this->erratum_insn());
1125 for (uint32_t i = 1; i < num_insns; ++i)
1126 elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
1130 // Reloc stub class.
1132 template<int size, bool big_endian>
1133 class Reloc_stub : public Stub_base<size, big_endian>
1136 typedef Reloc_stub<size, big_endian> This;
1137 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
1139 // Branch range. This is used to calculate the section group size, as well as
1140 // determine whether a stub is needed.
1141 static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2;
1142 static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2);
1144 // Constant used to determine if an offset fits in the adrp instruction
1146 static const int MAX_ADRP_IMM = (1 << 20) - 1;
1147 static const int MIN_ADRP_IMM = -(1 << 20);
1149 static const int BYTES_PER_INSN = 4;
1150 static const int STUB_ADDR_ALIGN;
1152 // Determine whether the offset fits in the jump/branch instruction.
1154 aarch64_valid_branch_offset_p(int64_t offset)
1155 { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; }
1157 // Determine whether the offset fits in the adrp immediate field.
1159 aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest)
1161 typedef AArch64_relocate_functions<size, big_endian> Reloc;
1162 int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12;
1163 return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM;
1166 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1169 stub_type_for_reloc(unsigned int r_type, AArch64_address address,
1170 AArch64_address target);
1172 Reloc_stub(int type)
1173 : Stub_base<size, big_endian>(type)
1179 // The key class used to index the stub instance in the stub table's stub map.
1183 Key(int type, const Symbol* symbol, const Relobj* relobj,
1184 unsigned int r_sym, int32_t addend)
1185 : type_(type), addend_(addend)
1189 this->r_sym_ = Reloc_stub::invalid_index;
1190 this->u_.symbol = symbol;
1194 gold_assert(relobj != NULL && r_sym != invalid_index);
1195 this->r_sym_ = r_sym;
1196 this->u_.relobj = relobj;
1203 // Return stub type.
1206 { return this->type_; }
1208 // Return the local symbol index or invalid_index.
1211 { return this->r_sym_; }
1213 // Return the symbol if there is one.
1216 { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; }
1218 // Return the relobj if there is one.
1221 { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; }
1223 // Whether this equals to another key k.
1225 eq(const Key& k) const
1227 return ((this->type_ == k.type_)
1228 && (this->r_sym_ == k.r_sym_)
1229 && ((this->r_sym_ != Reloc_stub::invalid_index)
1230 ? (this->u_.relobj == k.u_.relobj)
1231 : (this->u_.symbol == k.u_.symbol))
1232 && (this->addend_ == k.addend_));
1235 // Return a hash value.
1239 size_t name_hash_value = gold::string_hash<char>(
1240 (this->r_sym_ != Reloc_stub::invalid_index)
1241 ? this->u_.relobj->name().c_str()
1242 : this->u_.symbol->name());
1243 // We only have 4 stub types.
1244 size_t stub_type_hash_value = 0x03 & this->type_;
1245 return (name_hash_value
1246 ^ stub_type_hash_value
1247 ^ ((this->r_sym_ & 0x3fff) << 2)
1248 ^ ((this->addend_ & 0xffff) << 16));
1251 // Functors for STL associative containers.
1255 operator()(const Key& k) const
1256 { return k.hash_value(); }
1262 operator()(const Key& k1, const Key& k2) const
1263 { return k1.eq(k2); }
1269 // If this is a local symbol, this is the index in the defining object.
1270 // Otherwise, it is invalid_index for a global symbol.
1271 unsigned int r_sym_;
1272 // If r_sym_ is an invalid index, this points to a global symbol.
1273 // Otherwise, it points to a relobj. We used the unsized and target
1274 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1275 // Arm_relobj, in order to avoid making the stub class a template
1276 // as most of the stub machinery is endianness-neutral. However, it
1277 // may require a bit of casting done by users of this class.
1280 const Symbol* symbol;
1281 const Relobj* relobj;
1283 // Addend associated with a reloc.
1285 }; // End of inner class Reloc_stub::Key
1288 // This may be overridden in the child class.
1290 do_write(unsigned char*, section_size_type);
1293 static const unsigned int invalid_index = static_cast<unsigned int>(-1);
1294 }; // End of Reloc_stub
1296 template<int size, bool big_endian>
1297 const int Reloc_stub<size, big_endian>::STUB_ADDR_ALIGN = 4;
1299 // Write data to output file.
1301 template<int size, bool big_endian>
1303 Reloc_stub<size, big_endian>::
1304 do_write(unsigned char* view, section_size_type)
1306 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
1307 const uint32_t* insns = this->insns();
1308 uint32_t num_insns = this->insn_num();
1309 Insntype* ip = reinterpret_cast<Insntype*>(view);
1310 for (uint32_t i = 0; i < num_insns; ++i)
1311 elfcpp::Swap<32, big_endian>::writeval(ip + i, insns[i]);
1315 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1318 template<int size, bool big_endian>
1320 Reloc_stub<size, big_endian>::stub_type_for_reloc(
1321 unsigned int r_type, AArch64_address location, AArch64_address dest)
1323 int64_t branch_offset = 0;
1326 case elfcpp::R_AARCH64_CALL26:
1327 case elfcpp::R_AARCH64_JUMP26:
1328 branch_offset = dest - location;
1334 if (aarch64_valid_branch_offset_p(branch_offset))
1337 if (aarch64_valid_for_adrp_p(location, dest))
1338 return ST_ADRP_BRANCH;
1340 // Always use PC-relative addressing in case of -shared or -pie.
1341 if (parameters->options().output_is_position_independent())
1342 return ST_LONG_BRANCH_PCREL;
1344 // This saves 2 insns per stub, compared to ST_LONG_BRANCH_PCREL.
1345 // But is only applicable to non-shared or non-pie.
1346 return ST_LONG_BRANCH_ABS;
1349 // A class to hold stubs for the ARM target.
1351 template<int size, bool big_endian>
1352 class Stub_table : public Output_data
1355 typedef Target_aarch64<size, big_endian> The_target_aarch64;
1356 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
1357 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
1358 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
1359 typedef Reloc_stub<size, big_endian> The_reloc_stub;
1360 typedef typename The_reloc_stub::Key The_reloc_stub_key;
1361 typedef Erratum_stub<size, big_endian> The_erratum_stub;
1362 typedef Erratum_stub_less<size, big_endian> The_erratum_stub_less;
1363 typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash;
1364 typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to;
1365 typedef Stub_table<size, big_endian> The_stub_table;
1366 typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*,
1367 The_reloc_stub_key_hash, The_reloc_stub_key_equal_to>
1369 typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter;
1370 typedef Relocate_info<size, big_endian> The_relocate_info;
1372 typedef std::set<The_erratum_stub*, The_erratum_stub_less> Erratum_stub_set;
1373 typedef typename Erratum_stub_set::iterator Erratum_stub_set_iter;
1375 Stub_table(The_aarch64_input_section* owner)
1376 : Output_data(), owner_(owner), reloc_stubs_size_(0),
1377 erratum_stubs_size_(0), prev_data_size_(0)
1383 The_aarch64_input_section*
1387 // Whether this stub table is empty.
1390 { return reloc_stubs_.empty() && erratum_stubs_.empty(); }
1392 // Return the current data size.
1394 current_data_size() const
1395 { return this->current_data_size_for_child(); }
1397 // Add a STUB using KEY. The caller is responsible for avoiding addition
1398 // if a STUB with the same key has already been added.
1400 add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key);
1402 // Add an erratum stub into the erratum stub set. The set is ordered by
1403 // (relobj, shndx, sh_offset).
1405 add_erratum_stub(The_erratum_stub* stub);
1407 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1409 find_erratum_stub(The_aarch64_relobj* a64relobj,
1410 unsigned int shndx, unsigned int sh_offset);
1412 // Find all the erratums for a given input section. The return value is a pair
1413 // of iterators [begin, end).
1414 std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
1415 find_erratum_stubs_for_input_section(The_aarch64_relobj* a64relobj,
1416 unsigned int shndx);
1418 // Compute the erratum stub address.
1420 erratum_stub_address(The_erratum_stub* stub) const
1422 AArch64_address r = align_address(this->address() + this->reloc_stubs_size_,
1423 The_erratum_stub::STUB_ADDR_ALIGN);
1424 r += stub->offset();
1428 // Finalize stubs. No-op here, just for completeness.
1433 // Look up a relocation stub using KEY. Return NULL if there is none.
1435 find_reloc_stub(The_reloc_stub_key& key)
1437 Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key);
1438 return (p != this->reloc_stubs_.end()) ? p->second : NULL;
1441 // Relocate stubs in this stub table.
1443 relocate_stubs(const The_relocate_info*,
1444 The_target_aarch64*,
1450 // Update data size at the end of a relaxation pass. Return true if data size
1451 // is different from that of the previous relaxation pass.
1453 update_data_size_changed_p()
1455 // No addralign changed here.
1456 off_t s = align_address(this->reloc_stubs_size_,
1457 The_erratum_stub::STUB_ADDR_ALIGN)
1458 + this->erratum_stubs_size_;
1459 bool changed = (s != this->prev_data_size_);
1460 this->prev_data_size_ = s;
1465 // Write out section contents.
1467 do_write(Output_file*);
1469 // Return the required alignment.
1471 do_addralign() const
1473 return std::max(The_reloc_stub::STUB_ADDR_ALIGN,
1474 The_erratum_stub::STUB_ADDR_ALIGN);
1477 // Reset address and file offset.
1479 do_reset_address_and_file_offset()
1480 { this->set_current_data_size_for_child(this->prev_data_size_); }
1482 // Set final data size.
1484 set_final_data_size()
1485 { this->set_data_size(this->current_data_size()); }
1488 // Relocate one stub.
1490 relocate_stub(The_reloc_stub*,
1491 const The_relocate_info*,
1492 The_target_aarch64*,
1499 // Owner of this stub table.
1500 The_aarch64_input_section* owner_;
1501 // The relocation stubs.
1502 Reloc_stub_map reloc_stubs_;
1503 // The erratum stubs.
1504 Erratum_stub_set erratum_stubs_;
1505 // Size of reloc stubs.
1506 off_t reloc_stubs_size_;
1507 // Size of erratum stubs.
1508 off_t erratum_stubs_size_;
1509 // data size of this in the previous pass.
1510 off_t prev_data_size_;
1511 }; // End of Stub_table
1514 // Add an erratum stub into the erratum stub set. The set is ordered by
1515 // (relobj, shndx, sh_offset).
1517 template<int size, bool big_endian>
1519 Stub_table<size, big_endian>::add_erratum_stub(The_erratum_stub* stub)
1521 std::pair<Erratum_stub_set_iter, bool> ret =
1522 this->erratum_stubs_.insert(stub);
1523 gold_assert(ret.second);
1524 this->erratum_stubs_size_ = align_address(
1525 this->erratum_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
1526 stub->set_offset(this->erratum_stubs_size_);
1527 this->erratum_stubs_size_ += stub->stub_size();
1531 // Find if such erratum exists for given (obj, shndx, sh_offset).
1533 template<int size, bool big_endian>
1534 Erratum_stub<size, big_endian>*
1535 Stub_table<size, big_endian>::find_erratum_stub(
1536 The_aarch64_relobj* a64relobj, unsigned int shndx, unsigned int sh_offset)
1538 // A dummy object used as key to search in the set.
1539 The_erratum_stub key(a64relobj, ST_NONE,
1541 Erratum_stub_set_iter i = this->erratum_stubs_.find(&key);
1542 if (i != this->erratum_stubs_.end())
1544 The_erratum_stub* stub(*i);
1545 gold_assert(stub->erratum_insn() != 0);
1552 // Find all the errata for a given input section. The return value is a pair of
1553 // iterators [begin, end).
1555 template<int size, bool big_endian>
1556 std::pair<typename Stub_table<size, big_endian>::Erratum_stub_set_iter,
1557 typename Stub_table<size, big_endian>::Erratum_stub_set_iter>
1558 Stub_table<size, big_endian>::find_erratum_stubs_for_input_section(
1559 The_aarch64_relobj* a64relobj, unsigned int shndx)
1561 typedef std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter> Result_pair;
1562 Erratum_stub_set_iter start, end;
1563 The_erratum_stub low_key(a64relobj, ST_NONE, shndx, 0);
1564 start = this->erratum_stubs_.lower_bound(&low_key);
1565 if (start == this->erratum_stubs_.end())
1566 return Result_pair(this->erratum_stubs_.end(),
1567 this->erratum_stubs_.end());
1569 while (end != this->erratum_stubs_.end() &&
1570 (*end)->relobj() == a64relobj && (*end)->shndx() == shndx)
1572 return Result_pair(start, end);
1576 // Add a STUB using KEY. The caller is responsible for avoiding addition
1577 // if a STUB with the same key has already been added.
1579 template<int size, bool big_endian>
1581 Stub_table<size, big_endian>::add_reloc_stub(
1582 The_reloc_stub* stub, const The_reloc_stub_key& key)
1584 gold_assert(stub->type() == key.type());
1585 this->reloc_stubs_[key] = stub;
1587 // Assign stub offset early. We can do this because we never remove
1588 // reloc stubs and they are in the beginning of the stub table.
1589 this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_,
1590 The_reloc_stub::STUB_ADDR_ALIGN);
1591 stub->set_offset(this->reloc_stubs_size_);
1592 this->reloc_stubs_size_ += stub->stub_size();
1596 // Relocate all stubs in this stub table.
1598 template<int size, bool big_endian>
1600 Stub_table<size, big_endian>::
1601 relocate_stubs(const The_relocate_info* relinfo,
1602 The_target_aarch64* target_aarch64,
1603 Output_section* output_section,
1604 unsigned char* view,
1605 AArch64_address address,
1606 section_size_type view_size)
1608 // "view_size" is the total size of the stub_table.
1609 gold_assert(address == this->address() &&
1610 view_size == static_cast<section_size_type>(this->data_size()));
1611 for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin();
1612 p != this->reloc_stubs_.end(); ++p)
1613 relocate_stub(p->second, relinfo, target_aarch64, output_section,
1614 view, address, view_size);
1616 // Just for convenience.
1617 const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
1619 // Now 'relocate' erratum stubs.
1620 for(Erratum_stub_set_iter i = this->erratum_stubs_.begin();
1621 i != this->erratum_stubs_.end(); ++i)
1623 AArch64_address stub_address = this->erratum_stub_address(*i);
1624 // The address of "b" in the stub that is to be "relocated".
1625 AArch64_address stub_b_insn_address;
1626 // Branch offset that is to be filled in "b" insn.
1628 switch ((*i)->type())
1632 // The 1st insn of the erratum could be a relocation spot,
1633 // in this case we need to fix it with
1634 // "(*i)->erratum_insn()".
1635 elfcpp::Swap<32, big_endian>::writeval(
1636 view + (stub_address - this->address()),
1637 (*i)->erratum_insn());
1638 // For the erratum, the 2nd insn is a b-insn to be patched
1640 stub_b_insn_address = stub_address + 1 * BPI;
1641 b_offset = (*i)->destination_address() - stub_b_insn_address;
1642 AArch64_relocate_functions<size, big_endian>::construct_b(
1643 view + (stub_b_insn_address - this->address()),
1644 ((unsigned int)(b_offset)) & 0xfffffff);
1654 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
1656 template<int size, bool big_endian>
1658 Stub_table<size, big_endian>::
1659 relocate_stub(The_reloc_stub* stub,
1660 const The_relocate_info* relinfo,
1661 The_target_aarch64* target_aarch64,
1662 Output_section* output_section,
1663 unsigned char* view,
1664 AArch64_address address,
1665 section_size_type view_size)
1667 // "offset" is the offset from the beginning of the stub_table.
1668 section_size_type offset = stub->offset();
1669 section_size_type stub_size = stub->stub_size();
1670 // "view_size" is the total size of the stub_table.
1671 gold_assert(offset + stub_size <= view_size);
1673 target_aarch64->relocate_stub(stub, relinfo, output_section,
1674 view + offset, address + offset, view_size);
1678 // Write out the stubs to file.
1680 template<int size, bool big_endian>
1682 Stub_table<size, big_endian>::do_write(Output_file* of)
1684 off_t offset = this->offset();
1685 const section_size_type oview_size =
1686 convert_to_section_size_type(this->data_size());
1687 unsigned char* const oview = of->get_output_view(offset, oview_size);
1689 // Write relocation stubs.
1690 for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin();
1691 p != this->reloc_stubs_.end(); ++p)
1693 The_reloc_stub* stub = p->second;
1694 AArch64_address address = this->address() + stub->offset();
1695 gold_assert(address ==
1696 align_address(address, The_reloc_stub::STUB_ADDR_ALIGN));
1697 stub->write(oview + stub->offset(), stub->stub_size());
1700 // Write erratum stubs.
1701 unsigned int erratum_stub_start_offset =
1702 align_address(this->reloc_stubs_size_, The_erratum_stub::STUB_ADDR_ALIGN);
1703 for (typename Erratum_stub_set::iterator p = this->erratum_stubs_.begin();
1704 p != this->erratum_stubs_.end(); ++p)
1706 The_erratum_stub* stub(*p);
1707 stub->write(oview + erratum_stub_start_offset + stub->offset(),
1711 of->write_output_view(this->offset(), oview_size, oview);
1715 // AArch64_relobj class.
1717 template<int size, bool big_endian>
1718 class AArch64_relobj : public Sized_relobj_file<size, big_endian>
1721 typedef AArch64_relobj<size, big_endian> This;
1722 typedef Target_aarch64<size, big_endian> The_target_aarch64;
1723 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
1724 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
1725 typedef Stub_table<size, big_endian> The_stub_table;
1726 typedef Erratum_stub<size, big_endian> The_erratum_stub;
1727 typedef typename The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter;
1728 typedef std::vector<The_stub_table*> Stub_table_list;
1729 static const AArch64_address invalid_address =
1730 static_cast<AArch64_address>(-1);
1732 AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset,
1733 const typename elfcpp::Ehdr<size, big_endian>& ehdr)
1734 : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr),
1741 // Return the stub table of the SHNDX-th section if there is one.
1743 stub_table(unsigned int shndx) const
1745 gold_assert(shndx < this->stub_tables_.size());
1746 return this->stub_tables_[shndx];
1749 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1751 set_stub_table(unsigned int shndx, The_stub_table* stub_table)
1753 gold_assert(shndx < this->stub_tables_.size());
1754 this->stub_tables_[shndx] = stub_table;
1757 // Entrance to errata scanning.
1759 scan_errata(unsigned int shndx,
1760 const elfcpp::Shdr<size, big_endian>&,
1761 Output_section*, const Symbol_table*,
1762 The_target_aarch64*);
1764 // Scan all relocation sections for stub generation.
1766 scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*,
1769 // Whether a section is a scannable text section.
1771 text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int,
1772 const Output_section*, const Symbol_table*);
1774 // Convert regular input section with index SHNDX to a relaxed section.
1776 convert_input_section_to_relaxed_section(unsigned shndx)
1778 // The stubs have relocations and we need to process them after writing
1779 // out the stubs. So relocation now must follow section write.
1780 this->set_section_offset(shndx, -1ULL);
1781 this->set_relocs_must_follow_section_writes();
1784 // Structure for mapping symbol position.
1785 struct Mapping_symbol_position
1787 Mapping_symbol_position(unsigned int shndx, AArch64_address offset):
1788 shndx_(shndx), offset_(offset)
1791 // "<" comparator used in ordered_map container.
1793 operator<(const Mapping_symbol_position& p) const
1795 return (this->shndx_ < p.shndx_
1796 || (this->shndx_ == p.shndx_ && this->offset_ < p.offset_));
1800 unsigned int shndx_;
1803 AArch64_address offset_;
1806 typedef std::map<Mapping_symbol_position, char> Mapping_symbol_info;
1809 // Post constructor setup.
1813 // Call parent's setup method.
1814 Sized_relobj_file<size, big_endian>::do_setup();
1816 // Initialize look-up tables.
1817 this->stub_tables_.resize(this->shnum());
1821 do_relocate_sections(
1822 const Symbol_table* symtab, const Layout* layout,
1823 const unsigned char* pshdrs, Output_file* of,
1824 typename Sized_relobj_file<size, big_endian>::Views* pviews);
1826 // Count local symbols and (optionally) record mapping info.
1828 do_count_local_symbols(Stringpool_template<char>*,
1829 Stringpool_template<char>*);
1832 // Fix all errata in the object.
1834 fix_errata(typename Sized_relobj_file<size, big_endian>::Views* pviews);
1836 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1839 try_fix_erratum_843419_optimized(
1841 typename Sized_relobj_file<size, big_endian>::View_size&);
1843 // Whether a section needs to be scanned for relocation stubs.
1845 section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&,
1846 const Relobj::Output_sections&,
1847 const Symbol_table*, const unsigned char*);
1849 // List of stub tables.
1850 Stub_table_list stub_tables_;
1852 // Mapping symbol information sorted by (section index, section_offset).
1853 Mapping_symbol_info mapping_symbol_info_;
1854 }; // End of AArch64_relobj
1857 // Override to record mapping symbol information.
1858 template<int size, bool big_endian>
1860 AArch64_relobj<size, big_endian>::do_count_local_symbols(
1861 Stringpool_template<char>* pool, Stringpool_template<char>* dynpool)
1863 Sized_relobj_file<size, big_endian>::do_count_local_symbols(pool, dynpool);
1865 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1866 // processing if not fixing erratum.
1867 if (!parameters->options().fix_cortex_a53_843419()
1868 && !parameters->options().fix_cortex_a53_835769())
1871 const unsigned int loccount = this->local_symbol_count();
1875 // Read the symbol table section header.
1876 const unsigned int symtab_shndx = this->symtab_shndx();
1877 elfcpp::Shdr<size, big_endian>
1878 symtabshdr(this, this->elf_file()->section_header(symtab_shndx));
1879 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
1881 // Read the local symbols.
1882 const int sym_size =elfcpp::Elf_sizes<size>::sym_size;
1883 gold_assert(loccount == symtabshdr.get_sh_info());
1884 off_t locsize = loccount * sym_size;
1885 const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(),
1886 locsize, true, true);
1888 // For mapping symbol processing, we need to read the symbol names.
1889 unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link());
1890 if (strtab_shndx >= this->shnum())
1892 this->error(_("invalid symbol table name index: %u"), strtab_shndx);
1896 elfcpp::Shdr<size, big_endian>
1897 strtabshdr(this, this->elf_file()->section_header(strtab_shndx));
1898 if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB)
1900 this->error(_("symbol table name section has wrong type: %u"),
1901 static_cast<unsigned int>(strtabshdr.get_sh_type()));
1905 const char* pnames =
1906 reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(),
1907 strtabshdr.get_sh_size(),
1910 // Skip the first dummy symbol.
1912 typename Sized_relobj_file<size, big_endian>::Local_values*
1913 plocal_values = this->local_values();
1914 for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size)
1916 elfcpp::Sym<size, big_endian> sym(psyms);
1917 Symbol_value<size>& lv((*plocal_values)[i]);
1918 AArch64_address input_value = lv.input_value();
1920 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1921 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1923 // Mapping symbols could be one of the following 4 forms -
1928 const char* sym_name = pnames + sym.get_st_name();
1929 if (sym_name[0] == '$' && (sym_name[1] == 'x' || sym_name[1] == 'd')
1930 && (sym_name[2] == '\0' || sym_name[2] == '.'))
1933 unsigned int input_shndx =
1934 this->adjust_sym_shndx(i, sym.get_st_shndx(), &is_ordinary);
1935 gold_assert(is_ordinary);
1937 Mapping_symbol_position msp(input_shndx, input_value);
1938 // Insert mapping_symbol_info into map whose ordering is defined by
1939 // (shndx, offset_within_section).
1940 this->mapping_symbol_info_[msp] = sym_name[1];
1946 // Fix all errata in the object.
1948 template<int size, bool big_endian>
1950 AArch64_relobj<size, big_endian>::fix_errata(
1951 typename Sized_relobj_file<size, big_endian>::Views* pviews)
1953 typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
1954 unsigned int shnum = this->shnum();
1955 for (unsigned int i = 1; i < shnum; ++i)
1957 The_stub_table* stub_table = this->stub_table(i);
1960 std::pair<Erratum_stub_set_iter, Erratum_stub_set_iter>
1961 ipair(stub_table->find_erratum_stubs_for_input_section(this, i));
1962 Erratum_stub_set_iter p = ipair.first, end = ipair.second;
1965 The_erratum_stub* stub = *p;
1966 typename Sized_relobj_file<size, big_endian>::View_size&
1967 pview((*pviews)[i]);
1969 // Double check data before fix.
1970 gold_assert(pview.address + stub->sh_offset()
1971 == stub->erratum_address());
1973 // Update previously recorded erratum insn with relocated
1976 reinterpret_cast<Insntype*>(pview.view + stub->sh_offset());
1977 Insntype insn_to_fix = ip[0];
1978 stub->update_erratum_insn(insn_to_fix);
1980 // First try to see if erratum is 843419 and if it can be fixed
1981 // without using branch-to-stub.
1982 if (!try_fix_erratum_843419_optimized(stub, pview))
1984 // Replace the erratum insn with a branch-to-stub.
1985 AArch64_address stub_address =
1986 stub_table->erratum_stub_address(stub);
1987 unsigned int b_offset = stub_address - stub->erratum_address();
1988 AArch64_relocate_functions<size, big_endian>::construct_b(
1989 pview.view + stub->sh_offset(), b_offset & 0xfffffff);
1997 // This is an optimization for 843419. This erratum requires the sequence begin
1998 // with 'adrp', when final value calculated by adrp fits in adr, we can just
1999 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
2000 // in this case, we do not delete the erratum stub (too late to do so), it is
2001 // merely generated without ever being called.)
2003 template<int size, bool big_endian>
2005 AArch64_relobj<size, big_endian>::try_fix_erratum_843419_optimized(
2006 The_erratum_stub* stub,
2007 typename Sized_relobj_file<size, big_endian>::View_size& pview)
2009 if (stub->type() != ST_E_843419)
2012 typedef AArch64_insn_utilities<big_endian> Insn_utilities;
2013 typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
2014 E843419_stub<size, big_endian>* e843419_stub =
2015 reinterpret_cast<E843419_stub<size, big_endian>*>(stub);
2016 AArch64_address pc = pview.address + e843419_stub->adrp_sh_offset();
2017 unsigned int adrp_offset = e843419_stub->adrp_sh_offset ();
2018 Insntype* adrp_view = reinterpret_cast<Insntype*>(pview.view + adrp_offset);
2019 Insntype adrp_insn = adrp_view[0];
2021 // If the instruction at adrp_sh_offset is "mrs R, tpidr_el0", it may come
2022 // from IE -> LE relaxation etc. This is a side-effect of TLS relaxation that
2023 // ADRP has been turned into MRS, there is no erratum risk anymore.
2024 // Therefore, we return true to avoid doing unnecessary branch-to-stub.
2025 if (Insn_utilities::is_mrs_tpidr_el0(adrp_insn))
2028 // If the instruction at adrp_sh_offset is not ADRP and the instruction before
2029 // it is "mrs R, tpidr_el0", it may come from LD -> LE relaxation etc.
2030 // Like the above case, there is no erratum risk any more, we can safely
2032 if (!Insn_utilities::is_adrp(adrp_insn) && adrp_offset)
2035 = reinterpret_cast<Insntype*>(pview.view + adrp_offset - 4);
2036 Insntype prev_insn = prev_view[0];
2038 if (Insn_utilities::is_mrs_tpidr_el0(prev_insn))
2042 /* If we reach here, the first instruction must be ADRP. */
2043 gold_assert(Insn_utilities::is_adrp(adrp_insn));
2044 // Get adrp 33-bit signed imm value.
2045 int64_t adrp_imm = Insn_utilities::
2046 aarch64_adrp_decode_imm(adrp_insn);
2047 // adrp - final value transferred to target register is calculated as:
2048 // PC[11:0] = Zeros(12)
2049 // adrp_dest_value = PC + adrp_imm;
2050 int64_t adrp_dest_value = (pc & ~((1 << 12) - 1)) + adrp_imm;
2051 // adr -final value transferred to target register is calucalted as:
2054 // PC + adr_imm = adrp_dest_value
2056 // adr_imm = adrp_dest_value - PC
2057 int64_t adr_imm = adrp_dest_value - pc;
2058 // Check if imm fits in adr (21-bit signed).
2059 if (-(1 << 20) <= adr_imm && adr_imm < (1 << 20))
2061 // Convert 'adrp' into 'adr'.
2062 Insntype adr_insn = adrp_insn & ((1u << 31) - 1);
2063 adr_insn = Insn_utilities::
2064 aarch64_adr_encode_imm(adr_insn, adr_imm);
2065 elfcpp::Swap<32, big_endian>::writeval(adrp_view, adr_insn);
2072 // Relocate sections.
2074 template<int size, bool big_endian>
2076 AArch64_relobj<size, big_endian>::do_relocate_sections(
2077 const Symbol_table* symtab, const Layout* layout,
2078 const unsigned char* pshdrs, Output_file* of,
2079 typename Sized_relobj_file<size, big_endian>::Views* pviews)
2081 // Relocate the section data.
2082 this->relocate_section_range(symtab, layout, pshdrs, of, pviews,
2083 1, this->shnum() - 1);
2085 // We do not generate stubs if doing a relocatable link.
2086 if (parameters->options().relocatable())
2089 if (parameters->options().fix_cortex_a53_843419()
2090 || parameters->options().fix_cortex_a53_835769())
2091 this->fix_errata(pviews);
2093 Relocate_info<size, big_endian> relinfo;
2094 relinfo.symtab = symtab;
2095 relinfo.layout = layout;
2096 relinfo.object = this;
2098 // Relocate stub tables.
2099 unsigned int shnum = this->shnum();
2100 The_target_aarch64* target = The_target_aarch64::current_target();
2102 for (unsigned int i = 1; i < shnum; ++i)
2104 The_aarch64_input_section* aarch64_input_section =
2105 target->find_aarch64_input_section(this, i);
2106 if (aarch64_input_section != NULL
2107 && aarch64_input_section->is_stub_table_owner()
2108 && !aarch64_input_section->stub_table()->empty())
2110 Output_section* os = this->output_section(i);
2111 gold_assert(os != NULL);
2113 relinfo.reloc_shndx = elfcpp::SHN_UNDEF;
2114 relinfo.reloc_shdr = NULL;
2115 relinfo.data_shndx = i;
2116 relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size;
2118 typename Sized_relobj_file<size, big_endian>::View_size&
2119 view_struct = (*pviews)[i];
2120 gold_assert(view_struct.view != NULL);
2122 The_stub_table* stub_table = aarch64_input_section->stub_table();
2123 off_t offset = stub_table->address() - view_struct.address;
2124 unsigned char* view = view_struct.view + offset;
2125 AArch64_address address = stub_table->address();
2126 section_size_type view_size = stub_table->data_size();
2127 stub_table->relocate_stubs(&relinfo, target, os, view, address,
2134 // Determine if an input section is scannable for stub processing. SHDR is
2135 // the header of the section and SHNDX is the section index. OS is the output
2136 // section for the input section and SYMTAB is the global symbol table used to
2137 // look up ICF information.
2139 template<int size, bool big_endian>
2141 AArch64_relobj<size, big_endian>::text_section_is_scannable(
2142 const elfcpp::Shdr<size, big_endian>& text_shdr,
2143 unsigned int text_shndx,
2144 const Output_section* os,
2145 const Symbol_table* symtab)
2147 // Skip any empty sections, unallocated sections or sections whose
2148 // type are not SHT_PROGBITS.
2149 if (text_shdr.get_sh_size() == 0
2150 || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0
2151 || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
2154 // Skip any discarded or ICF'ed sections.
2155 if (os == NULL || symtab->is_section_folded(this, text_shndx))
2158 // Skip exception frame.
2159 if (strcmp(os->name(), ".eh_frame") == 0)
2162 gold_assert(!this->is_output_section_offset_invalid(text_shndx) ||
2163 os->find_relaxed_input_section(this, text_shndx) != NULL);
2169 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2170 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2172 template<int size, bool big_endian>
2174 AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning(
2175 const elfcpp::Shdr<size, big_endian>& shdr,
2176 const Relobj::Output_sections& out_sections,
2177 const Symbol_table* symtab,
2178 const unsigned char* pshdrs)
2180 unsigned int sh_type = shdr.get_sh_type();
2181 if (sh_type != elfcpp::SHT_RELA)
2184 // Ignore empty section.
2185 off_t sh_size = shdr.get_sh_size();
2189 // Ignore reloc section with unexpected symbol table. The
2190 // error will be reported in the final link.
2191 if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx())
2194 gold_assert(sh_type == elfcpp::SHT_RELA);
2195 unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
2197 // Ignore reloc section with unexpected entsize or uneven size.
2198 // The error will be reported in the final link.
2199 if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0)
2202 // Ignore reloc section with bad info. This error will be
2203 // reported in the final link.
2204 unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info());
2205 if (text_shndx >= this->shnum())
2208 const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
2209 const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs +
2210 text_shndx * shdr_size);
2211 return this->text_section_is_scannable(text_shdr, text_shndx,
2212 out_sections[text_shndx], symtab);
2216 // Scan section SHNDX for erratum 843419 and 835769.
2218 template<int size, bool big_endian>
2220 AArch64_relobj<size, big_endian>::scan_errata(
2221 unsigned int shndx, const elfcpp::Shdr<size, big_endian>& shdr,
2222 Output_section* os, const Symbol_table* symtab,
2223 The_target_aarch64* target)
2225 if (shdr.get_sh_size() == 0
2226 || (shdr.get_sh_flags() &
2227 (elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR)) == 0
2228 || shdr.get_sh_type() != elfcpp::SHT_PROGBITS)
2231 if (!os || symtab->is_section_folded(this, shndx)) return;
2233 AArch64_address output_offset = this->get_output_section_offset(shndx);
2234 AArch64_address output_address;
2235 if (output_offset != invalid_address)
2236 output_address = os->address() + output_offset;
2239 const Output_relaxed_input_section* poris =
2240 os->find_relaxed_input_section(this, shndx);
2242 output_address = poris->address();
2245 section_size_type input_view_size = 0;
2246 const unsigned char* input_view =
2247 this->section_contents(shndx, &input_view_size, false);
2249 Mapping_symbol_position section_start(shndx, 0);
2250 // Find the first mapping symbol record within section shndx.
2251 typename Mapping_symbol_info::const_iterator p =
2252 this->mapping_symbol_info_.lower_bound(section_start);
2253 while (p != this->mapping_symbol_info_.end() &&
2254 p->first.shndx_ == shndx)
2256 typename Mapping_symbol_info::const_iterator prev = p;
2258 if (prev->second == 'x')
2260 section_size_type span_start =
2261 convert_to_section_size_type(prev->first.offset_);
2262 section_size_type span_end;
2263 if (p != this->mapping_symbol_info_.end()
2264 && p->first.shndx_ == shndx)
2265 span_end = convert_to_section_size_type(p->first.offset_);
2267 span_end = convert_to_section_size_type(shdr.get_sh_size());
2269 // Here we do not share the scanning code of both errata. For 843419,
2270 // only the last few insns of each page are examined, which is fast,
2271 // whereas, for 835769, every insn pair needs to be checked.
2273 if (parameters->options().fix_cortex_a53_843419())
2274 target->scan_erratum_843419_span(
2275 this, shndx, span_start, span_end,
2276 const_cast<unsigned char*>(input_view), output_address);
2278 if (parameters->options().fix_cortex_a53_835769())
2279 target->scan_erratum_835769_span(
2280 this, shndx, span_start, span_end,
2281 const_cast<unsigned char*>(input_view), output_address);
2287 // Scan relocations for stub generation.
2289 template<int size, bool big_endian>
2291 AArch64_relobj<size, big_endian>::scan_sections_for_stubs(
2292 The_target_aarch64* target,
2293 const Symbol_table* symtab,
2294 const Layout* layout)
2296 unsigned int shnum = this->shnum();
2297 const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
2299 // Read the section headers.
2300 const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(),
2304 // To speed up processing, we set up hash tables for fast lookup of
2305 // input offsets to output addresses.
2306 this->initialize_input_to_output_maps();
2308 const Relobj::Output_sections& out_sections(this->output_sections());
2310 Relocate_info<size, big_endian> relinfo;
2311 relinfo.symtab = symtab;
2312 relinfo.layout = layout;
2313 relinfo.object = this;
2315 // Do relocation stubs scanning.
2316 const unsigned char* p = pshdrs + shdr_size;
2317 for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
2319 const elfcpp::Shdr<size, big_endian> shdr(p);
2320 if (parameters->options().fix_cortex_a53_843419()
2321 || parameters->options().fix_cortex_a53_835769())
2322 scan_errata(i, shdr, out_sections[i], symtab, target);
2323 if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab,
2326 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
2327 AArch64_address output_offset =
2328 this->get_output_section_offset(index);
2329 AArch64_address output_address;
2330 if (output_offset != invalid_address)
2332 output_address = out_sections[index]->address() + output_offset;
2336 // Currently this only happens for a relaxed section.
2337 const Output_relaxed_input_section* poris =
2338 out_sections[index]->find_relaxed_input_section(this, index);
2339 gold_assert(poris != NULL);
2340 output_address = poris->address();
2343 // Get the relocations.
2344 const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
2348 // Get the section contents.
2349 section_size_type input_view_size = 0;
2350 const unsigned char* input_view =
2351 this->section_contents(index, &input_view_size, false);
2353 relinfo.reloc_shndx = i;
2354 relinfo.data_shndx = index;
2355 unsigned int sh_type = shdr.get_sh_type();
2356 unsigned int reloc_size;
2357 gold_assert (sh_type == elfcpp::SHT_RELA);
2358 reloc_size = elfcpp::Elf_sizes<size>::rela_size;
2360 Output_section* os = out_sections[index];
2361 target->scan_section_for_stubs(&relinfo, sh_type, prelocs,
2362 shdr.get_sh_size() / reloc_size,
2364 output_offset == invalid_address,
2365 input_view, output_address,
2372 // A class to wrap an ordinary input section containing executable code.
2374 template<int size, bool big_endian>
2375 class AArch64_input_section : public Output_relaxed_input_section
2378 typedef Stub_table<size, big_endian> The_stub_table;
2380 AArch64_input_section(Relobj* relobj, unsigned int shndx)
2381 : Output_relaxed_input_section(relobj, shndx, 1),
2383 original_contents_(NULL), original_size_(0),
2384 original_addralign_(1)
2387 ~AArch64_input_section()
2388 { delete[] this->original_contents_; }
2394 // Set the stub_table.
2396 set_stub_table(The_stub_table* st)
2397 { this->stub_table_ = st; }
2399 // Whether this is a stub table owner.
2401 is_stub_table_owner() const
2402 { return this->stub_table_ != NULL && this->stub_table_->owner() == this; }
2404 // Return the original size of the section.
2406 original_size() const
2407 { return this->original_size_; }
2409 // Return the stub table.
2412 { return stub_table_; }
2415 // Write out this input section.
2417 do_write(Output_file*);
2419 // Return required alignment of this.
2421 do_addralign() const
2423 if (this->is_stub_table_owner())
2424 return std::max(this->stub_table_->addralign(),
2425 static_cast<uint64_t>(this->original_addralign_));
2427 return this->original_addralign_;
2430 // Finalize data size.
2432 set_final_data_size();
2434 // Reset address and file offset.
2436 do_reset_address_and_file_offset();
2440 do_output_offset(const Relobj* object, unsigned int shndx,
2441 section_offset_type offset,
2442 section_offset_type* poutput) const
2444 if ((object == this->relobj())
2445 && (shndx == this->shndx())
2448 convert_types<section_offset_type, uint32_t>(this->original_size_)))
2458 // Copying is not allowed.
2459 AArch64_input_section(const AArch64_input_section&);
2460 AArch64_input_section& operator=(const AArch64_input_section&);
2462 // The relocation stubs.
2463 The_stub_table* stub_table_;
2464 // Original section contents. We have to make a copy here since the file
2465 // containing the original section may not be locked when we need to access
2467 unsigned char* original_contents_;
2468 // Section size of the original input section.
2469 uint32_t original_size_;
2470 // Address alignment of the original input section.
2471 uint32_t original_addralign_;
2472 }; // End of AArch64_input_section
2475 // Finalize data size.
2477 template<int size, bool big_endian>
2479 AArch64_input_section<size, big_endian>::set_final_data_size()
2481 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
2483 if (this->is_stub_table_owner())
2485 this->stub_table_->finalize_data_size();
2486 off = align_address(off, this->stub_table_->addralign());
2487 off += this->stub_table_->data_size();
2489 this->set_data_size(off);
2493 // Reset address and file offset.
2495 template<int size, bool big_endian>
2497 AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset()
2499 // Size of the original input section contents.
2500 off_t off = convert_types<off_t, uint64_t>(this->original_size_);
2502 // If this is a stub table owner, account for the stub table size.
2503 if (this->is_stub_table_owner())
2505 The_stub_table* stub_table = this->stub_table_;
2507 // Reset the stub table's address and file offset. The
2508 // current data size for child will be updated after that.
2509 stub_table_->reset_address_and_file_offset();
2510 off = align_address(off, stub_table_->addralign());
2511 off += stub_table->current_data_size();
2514 this->set_current_data_size(off);
2518 // Initialize an Arm_input_section.
2520 template<int size, bool big_endian>
2522 AArch64_input_section<size, big_endian>::init()
2524 Relobj* relobj = this->relobj();
2525 unsigned int shndx = this->shndx();
2527 // We have to cache original size, alignment and contents to avoid locking
2528 // the original file.
2529 this->original_addralign_ =
2530 convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx));
2532 // This is not efficient but we expect only a small number of relaxed
2533 // input sections for stubs.
2534 section_size_type section_size;
2535 const unsigned char* section_contents =
2536 relobj->section_contents(shndx, §ion_size, false);
2537 this->original_size_ =
2538 convert_types<uint32_t, uint64_t>(relobj->section_size(shndx));
2540 gold_assert(this->original_contents_ == NULL);
2541 this->original_contents_ = new unsigned char[section_size];
2542 memcpy(this->original_contents_, section_contents, section_size);
2544 // We want to make this look like the original input section after
2545 // output sections are finalized.
2546 Output_section* os = relobj->output_section(shndx);
2547 off_t offset = relobj->output_section_offset(shndx);
2548 gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx));
2549 this->set_address(os->address() + offset);
2550 this->set_file_offset(os->offset() + offset);
2551 this->set_current_data_size(this->original_size_);
2552 this->finalize_data_size();
2556 // Write data to output file.
2558 template<int size, bool big_endian>
2560 AArch64_input_section<size, big_endian>::do_write(Output_file* of)
2562 // We have to write out the original section content.
2563 gold_assert(this->original_contents_ != NULL);
2564 of->write(this->offset(), this->original_contents_,
2565 this->original_size_);
2567 // If this owns a stub table and it is not empty, write it.
2568 if (this->is_stub_table_owner() && !this->stub_table_->empty())
2569 this->stub_table_->write(of);
2573 // Arm output section class. This is defined mainly to add a number of stub
2574 // generation methods.
2576 template<int size, bool big_endian>
2577 class AArch64_output_section : public Output_section
2580 typedef Target_aarch64<size, big_endian> The_target_aarch64;
2581 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
2582 typedef Stub_table<size, big_endian> The_stub_table;
2583 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
2586 AArch64_output_section(const char* name, elfcpp::Elf_Word type,
2587 elfcpp::Elf_Xword flags)
2588 : Output_section(name, type, flags)
2591 ~AArch64_output_section() {}
2593 // Group input sections for stub generation.
2595 group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*,
2599 typedef Output_section::Input_section Input_section;
2600 typedef Output_section::Input_section_list Input_section_list;
2602 // Create a stub group.
2604 create_stub_group(Input_section_list::const_iterator,
2605 Input_section_list::const_iterator,
2606 Input_section_list::const_iterator,
2607 The_target_aarch64*,
2608 std::vector<Output_relaxed_input_section*>&,
2610 }; // End of AArch64_output_section
2613 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2614 // the input section that will be the owner of the stub table.
2616 template<int size, bool big_endian> void
2617 AArch64_output_section<size, big_endian>::create_stub_group(
2618 Input_section_list::const_iterator first,
2619 Input_section_list::const_iterator last,
2620 Input_section_list::const_iterator owner,
2621 The_target_aarch64* target,
2622 std::vector<Output_relaxed_input_section*>& new_relaxed_sections,
2625 // Currently we convert ordinary input sections into relaxed sections only
2627 The_aarch64_input_section* input_section;
2628 if (owner->is_relaxed_input_section())
2632 gold_assert(owner->is_input_section());
2633 // Create a new relaxed input section. We need to lock the original
2635 Task_lock_obj<Object> tl(task, owner->relobj());
2637 target->new_aarch64_input_section(owner->relobj(), owner->shndx());
2638 new_relaxed_sections.push_back(input_section);
2641 // Create a stub table.
2642 The_stub_table* stub_table =
2643 target->new_stub_table(input_section);
2645 input_section->set_stub_table(stub_table);
2647 Input_section_list::const_iterator p = first;
2648 // Look for input sections or relaxed input sections in [first ... last].
2651 if (p->is_input_section() || p->is_relaxed_input_section())
2653 // The stub table information for input sections live
2654 // in their objects.
2655 The_aarch64_relobj* aarch64_relobj =
2656 static_cast<The_aarch64_relobj*>(p->relobj());
2657 aarch64_relobj->set_stub_table(p->shndx(), stub_table);
2660 while (p++ != last);
2664 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2665 // stub groups. We grow a stub group by adding input section until the size is
2666 // just below GROUP_SIZE. The last input section will be converted into a stub
2667 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2668 // after the stub table, effectively doubling the group size.
2670 // This is similar to the group_sections() function in elf32-arm.c but is
2671 // implemented differently.
2673 template<int size, bool big_endian>
2674 void AArch64_output_section<size, big_endian>::group_sections(
2675 section_size_type group_size,
2676 bool stubs_always_after_branch,
2677 Target_aarch64<size, big_endian>* target,
2683 FINDING_STUB_SECTION,
2687 std::vector<Output_relaxed_input_section*> new_relaxed_sections;
2689 State state = NO_GROUP;
2690 section_size_type off = 0;
2691 section_size_type group_begin_offset = 0;
2692 section_size_type group_end_offset = 0;
2693 section_size_type stub_table_end_offset = 0;
2694 Input_section_list::const_iterator group_begin =
2695 this->input_sections().end();
2696 Input_section_list::const_iterator stub_table =
2697 this->input_sections().end();
2698 Input_section_list::const_iterator group_end = this->input_sections().end();
2699 for (Input_section_list::const_iterator p = this->input_sections().begin();
2700 p != this->input_sections().end();
2703 section_size_type section_begin_offset =
2704 align_address(off, p->addralign());
2705 section_size_type section_end_offset =
2706 section_begin_offset + p->data_size();
2708 // Check to see if we should group the previously seen sections.
2714 case FINDING_STUB_SECTION:
2715 // Adding this section makes the group larger than GROUP_SIZE.
2716 if (section_end_offset - group_begin_offset >= group_size)
2718 if (stubs_always_after_branch)
2720 gold_assert(group_end != this->input_sections().end());
2721 this->create_stub_group(group_begin, group_end, group_end,
2722 target, new_relaxed_sections,
2728 // Input sections up to stub_group_size bytes after the stub
2729 // table can be handled by it too.
2730 state = HAS_STUB_SECTION;
2731 stub_table = group_end;
2732 stub_table_end_offset = group_end_offset;
2737 case HAS_STUB_SECTION:
2738 // Adding this section makes the post stub-section group larger
2741 // NOT SUPPORTED YET. For completeness only.
2742 if (section_end_offset - stub_table_end_offset >= group_size)
2744 gold_assert(group_end != this->input_sections().end());
2745 this->create_stub_group(group_begin, group_end, stub_table,
2746 target, new_relaxed_sections, task);
2755 // If we see an input section and currently there is no group, start
2756 // a new one. Skip any empty sections. We look at the data size
2757 // instead of calling p->relobj()->section_size() to avoid locking.
2758 if ((p->is_input_section() || p->is_relaxed_input_section())
2759 && (p->data_size() != 0))
2761 if (state == NO_GROUP)
2763 state = FINDING_STUB_SECTION;
2765 group_begin_offset = section_begin_offset;
2768 // Keep track of the last input section seen.
2770 group_end_offset = section_end_offset;
2773 off = section_end_offset;
2776 // Create a stub group for any ungrouped sections.
2777 if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION)
2779 gold_assert(group_end != this->input_sections().end());
2780 this->create_stub_group(group_begin, group_end,
2781 (state == FINDING_STUB_SECTION
2784 target, new_relaxed_sections, task);
2787 if (!new_relaxed_sections.empty())
2788 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections);
2790 // Update the section offsets
2791 for (size_t i = 0; i < new_relaxed_sections.size(); ++i)
2793 The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>(
2794 new_relaxed_sections[i]->relobj());
2795 unsigned int shndx = new_relaxed_sections[i]->shndx();
2796 // Tell AArch64_relobj that this input section is converted.
2797 relobj->convert_input_section_to_relaxed_section(shndx);
2799 } // End of AArch64_output_section::group_sections
2802 AArch64_reloc_property_table* aarch64_reloc_property_table = NULL;
2805 // The aarch64 target class.
2807 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2808 template<int size, bool big_endian>
2809 class Target_aarch64 : public Sized_target<size, big_endian>
2812 typedef Target_aarch64<size, big_endian> This;
2813 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
2815 typedef Relocate_info<size, big_endian> The_relocate_info;
2816 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
2817 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
2818 typedef Reloc_stub<size, big_endian> The_reloc_stub;
2819 typedef Erratum_stub<size, big_endian> The_erratum_stub;
2820 typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key;
2821 typedef Stub_table<size, big_endian> The_stub_table;
2822 typedef std::vector<The_stub_table*> Stub_table_list;
2823 typedef typename Stub_table_list::iterator Stub_table_iterator;
2824 typedef AArch64_input_section<size, big_endian> The_aarch64_input_section;
2825 typedef AArch64_output_section<size, big_endian> The_aarch64_output_section;
2826 typedef Unordered_map<Section_id,
2827 AArch64_input_section<size, big_endian>*,
2828 Section_id_hash> AArch64_input_section_map;
2829 typedef AArch64_insn_utilities<big_endian> Insn_utilities;
2830 const static int TCB_SIZE = size / 8 * 2;
2832 Target_aarch64(const Target::Target_info* info = &aarch64_info)
2833 : Sized_target<size, big_endian>(info),
2834 got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
2835 got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
2836 rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY),
2837 got_mod_index_offset_(-1U),
2838 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2839 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2842 // Scan the relocations to determine unreferenced sections for
2843 // garbage collection.
2845 gc_process_relocs(Symbol_table* symtab,
2847 Sized_relobj_file<size, big_endian>* object,
2848 unsigned int data_shndx,
2849 unsigned int sh_type,
2850 const unsigned char* prelocs,
2852 Output_section* output_section,
2853 bool needs_special_offset_handling,
2854 size_t local_symbol_count,
2855 const unsigned char* plocal_symbols);
2857 // Scan the relocations to look for symbol adjustments.
2859 scan_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);
2871 // Finalize the sections.
2873 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2875 // Return the value to use for a dynamic which requires special
2878 do_dynsym_value(const Symbol*) const;
2880 // Relocate a section.
2882 relocate_section(const Relocate_info<size, big_endian>*,
2883 unsigned int sh_type,
2884 const unsigned char* prelocs,
2886 Output_section* output_section,
2887 bool needs_special_offset_handling,
2888 unsigned char* view,
2889 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
2890 section_size_type view_size,
2891 const Reloc_symbol_changes*);
2893 // Scan the relocs during a relocatable link.
2895 scan_relocatable_relocs(Symbol_table* symtab,
2897 Sized_relobj_file<size, big_endian>* object,
2898 unsigned int data_shndx,
2899 unsigned int sh_type,
2900 const unsigned char* prelocs,
2902 Output_section* output_section,
2903 bool needs_special_offset_handling,
2904 size_t local_symbol_count,
2905 const unsigned char* plocal_symbols,
2906 Relocatable_relocs*);
2908 // Scan the relocs for --emit-relocs.
2910 emit_relocs_scan(Symbol_table* symtab,
2912 Sized_relobj_file<size, big_endian>* object,
2913 unsigned int data_shndx,
2914 unsigned int sh_type,
2915 const unsigned char* prelocs,
2917 Output_section* output_section,
2918 bool needs_special_offset_handling,
2919 size_t local_symbol_count,
2920 const unsigned char* plocal_syms,
2921 Relocatable_relocs* rr);
2923 // Relocate a section during a relocatable link.
2926 const Relocate_info<size, big_endian>*,
2927 unsigned int sh_type,
2928 const unsigned char* prelocs,
2930 Output_section* output_section,
2931 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
2932 unsigned char* view,
2933 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
2934 section_size_type view_size,
2935 unsigned char* reloc_view,
2936 section_size_type reloc_view_size);
2938 // Return the symbol index to use for a target specific relocation.
2939 // The only target specific relocation is R_AARCH64_TLSDESC for a
2940 // local symbol, which is an absolute reloc.
2942 do_reloc_symbol_index(void*, unsigned int r_type) const
2944 gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
2948 // Return the addend to use for a target specific relocation.
2950 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
2952 // Return the PLT section.
2954 do_plt_address_for_global(const Symbol* gsym) const
2955 { return this->plt_section()->address_for_global(gsym); }
2958 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
2959 { return this->plt_section()->address_for_local(relobj, symndx); }
2961 // This function should be defined in targets that can use relocation
2962 // types to determine (implemented in local_reloc_may_be_function_pointer
2963 // and global_reloc_may_be_function_pointer)
2964 // if a function's pointer is taken. ICF uses this in safe mode to only
2965 // fold those functions whose pointer is defintely not taken.
2967 do_can_check_for_function_pointers() const
2970 // Return the number of entries in the PLT.
2972 plt_entry_count() const;
2974 //Return the offset of the first non-reserved PLT entry.
2976 first_plt_entry_offset() const;
2978 // Return the size of each PLT entry.
2980 plt_entry_size() const;
2982 // Create a stub table.
2984 new_stub_table(The_aarch64_input_section*);
2986 // Create an aarch64 input section.
2987 The_aarch64_input_section*
2988 new_aarch64_input_section(Relobj*, unsigned int);
2990 // Find an aarch64 input section instance for a given OBJ and SHNDX.
2991 The_aarch64_input_section*
2992 find_aarch64_input_section(Relobj*, unsigned int) const;
2994 // Return the thread control block size.
2996 tcb_size() const { return This::TCB_SIZE; }
2998 // Scan a section for stub generation.
3000 scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int,
3001 const unsigned char*, size_t, Output_section*,
3002 bool, const unsigned char*,
3006 // Scan a relocation section for stub.
3007 template<int sh_type>
3009 scan_reloc_section_for_stubs(
3010 const The_relocate_info* relinfo,
3011 const unsigned char* prelocs,
3013 Output_section* output_section,
3014 bool needs_special_offset_handling,
3015 const unsigned char* view,
3016 Address view_address,
3019 // Relocate a single stub.
3021 relocate_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*,
3022 Output_section*, unsigned char*, Address,
3025 // Get the default AArch64 target.
3029 gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64
3030 && parameters->target().get_size() == size
3031 && parameters->target().is_big_endian() == big_endian);
3032 return static_cast<This*>(parameters->sized_target<size, big_endian>());
3036 // Scan erratum 843419 for a part of a section.
3038 scan_erratum_843419_span(
3039 AArch64_relobj<size, big_endian>*,
3041 const section_size_type,
3042 const section_size_type,
3046 // Scan erratum 835769 for a part of a section.
3048 scan_erratum_835769_span(
3049 AArch64_relobj<size, big_endian>*,
3051 const section_size_type,
3052 const section_size_type,
3058 do_select_as_default_target()
3060 gold_assert(aarch64_reloc_property_table == NULL);
3061 aarch64_reloc_property_table = new AArch64_reloc_property_table();
3064 // Add a new reloc argument, returning the index in the vector.
3066 add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object,
3069 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
3070 return this->tlsdesc_reloc_info_.size() - 1;
3073 virtual Output_data_plt_aarch64<size, big_endian>*
3074 do_make_data_plt(Layout* layout,
3075 Output_data_got_aarch64<size, big_endian>* got,
3076 Output_data_space* got_plt,
3077 Output_data_space* got_irelative)
3079 return new Output_data_plt_aarch64_standard<size, big_endian>(
3080 layout, got, got_plt, got_irelative);
3084 // do_make_elf_object to override the same function in the base class.
3086 do_make_elf_object(const std::string&, Input_file*, off_t,
3087 const elfcpp::Ehdr<size, big_endian>&);
3089 Output_data_plt_aarch64<size, big_endian>*
3090 make_data_plt(Layout* layout,
3091 Output_data_got_aarch64<size, big_endian>* got,
3092 Output_data_space* got_plt,
3093 Output_data_space* got_irelative)
3095 return this->do_make_data_plt(layout, got, got_plt, got_irelative);
3098 // We only need to generate stubs, and hence perform relaxation if we are
3099 // not doing relocatable linking.
3101 do_may_relax() const
3102 { return !parameters->options().relocatable(); }
3104 // Relaxation hook. This is where we do stub generation.
3106 do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*);
3109 group_sections(Layout* layout,
3110 section_size_type group_size,
3111 bool stubs_always_after_branch,
3115 scan_reloc_for_stub(const The_relocate_info*, unsigned int,
3116 const Sized_symbol<size>*, unsigned int,
3117 const Symbol_value<size>*,
3118 typename elfcpp::Elf_types<size>::Elf_Swxword,
3121 // Make an output section.
3123 do_make_output_section(const char* name, elfcpp::Elf_Word type,
3124 elfcpp::Elf_Xword flags)
3125 { return new The_aarch64_output_section(name, type, flags); }
3128 // The class which scans relocations.
3133 : issued_non_pic_error_(false)
3137 local(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
3138 Sized_relobj_file<size, big_endian>* object,
3139 unsigned int data_shndx,
3140 Output_section* output_section,
3141 const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
3142 const elfcpp::Sym<size, big_endian>& lsym,
3146 global(Symbol_table* symtab, Layout* layout, Target_aarch64* target,
3147 Sized_relobj_file<size, big_endian>* object,
3148 unsigned int data_shndx,
3149 Output_section* output_section,
3150 const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type,
3154 local_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
3155 Target_aarch64<size, big_endian>* ,
3156 Sized_relobj_file<size, big_endian>* ,
3159 const elfcpp::Rela<size, big_endian>& ,
3160 unsigned int r_type,
3161 const elfcpp::Sym<size, big_endian>&);
3164 global_reloc_may_be_function_pointer(Symbol_table* , Layout* ,
3165 Target_aarch64<size, big_endian>* ,
3166 Sized_relobj_file<size, big_endian>* ,
3169 const elfcpp::Rela<size, big_endian>& ,
3170 unsigned int r_type,
3175 unsupported_reloc_local(Sized_relobj_file<size, big_endian>*,
3176 unsigned int r_type);
3179 unsupported_reloc_global(Sized_relobj_file<size, big_endian>*,
3180 unsigned int r_type, Symbol*);
3183 possible_function_pointer_reloc(unsigned int r_type);
3186 check_non_pic(Relobj*, unsigned int r_type);
3189 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*,
3190 unsigned int r_type);
3192 // Whether we have issued an error about a non-PIC compilation.
3193 bool issued_non_pic_error_;
3196 // The class which implements relocation.
3201 : skip_call_tls_get_addr_(false)
3207 // Do a relocation. Return false if the caller should not issue
3208 // any warnings about this relocation.
3210 relocate(const Relocate_info<size, big_endian>*, unsigned int,
3211 Target_aarch64*, Output_section*, size_t, const unsigned char*,
3212 const Sized_symbol<size>*, const Symbol_value<size>*,
3213 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
3217 inline typename AArch64_relocate_functions<size, big_endian>::Status
3218 relocate_tls(const Relocate_info<size, big_endian>*,
3219 Target_aarch64<size, big_endian>*,
3221 const elfcpp::Rela<size, big_endian>&,
3222 unsigned int r_type, const Sized_symbol<size>*,
3223 const Symbol_value<size>*,
3225 typename elfcpp::Elf_types<size>::Elf_Addr);
3227 inline typename AArch64_relocate_functions<size, big_endian>::Status
3229 const Relocate_info<size, big_endian>*,
3230 Target_aarch64<size, big_endian>*,
3231 const elfcpp::Rela<size, big_endian>&,
3234 const Symbol_value<size>*);
3236 inline typename AArch64_relocate_functions<size, big_endian>::Status
3238 const Relocate_info<size, big_endian>*,
3239 Target_aarch64<size, big_endian>*,
3240 const elfcpp::Rela<size, big_endian>&,
3243 const Symbol_value<size>*);
3245 inline typename AArch64_relocate_functions<size, big_endian>::Status
3247 const Relocate_info<size, big_endian>*,
3248 Target_aarch64<size, big_endian>*,
3249 const elfcpp::Rela<size, big_endian>&,
3252 const Symbol_value<size>*);
3254 inline typename AArch64_relocate_functions<size, big_endian>::Status
3256 const Relocate_info<size, big_endian>*,
3257 Target_aarch64<size, big_endian>*,
3258 const elfcpp::Rela<size, big_endian>&,
3261 const Symbol_value<size>*);
3263 inline typename AArch64_relocate_functions<size, big_endian>::Status
3265 const Relocate_info<size, big_endian>*,
3266 Target_aarch64<size, big_endian>*,
3267 const elfcpp::Rela<size, big_endian>&,
3270 const Symbol_value<size>*,
3271 typename elfcpp::Elf_types<size>::Elf_Addr,
3272 typename elfcpp::Elf_types<size>::Elf_Addr);
3274 bool skip_call_tls_get_addr_;
3276 }; // End of class Relocate
3278 // Adjust TLS relocation type based on the options and whether this
3279 // is a local symbol.
3280 static tls::Tls_optimization
3281 optimize_tls_reloc(bool is_final, int r_type);
3283 // Get the GOT section, creating it if necessary.
3284 Output_data_got_aarch64<size, big_endian>*
3285 got_section(Symbol_table*, Layout*);
3287 // Get the GOT PLT section.
3289 got_plt_section() const
3291 gold_assert(this->got_plt_ != NULL);
3292 return this->got_plt_;
3295 // Get the GOT section for TLSDESC entries.
3296 Output_data_got<size, big_endian>*
3297 got_tlsdesc_section() const
3299 gold_assert(this->got_tlsdesc_ != NULL);
3300 return this->got_tlsdesc_;
3303 // Create the PLT section.
3305 make_plt_section(Symbol_table* symtab, Layout* layout);
3307 // Create a PLT entry for a global symbol.
3309 make_plt_entry(Symbol_table*, Layout*, Symbol*);
3311 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3313 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
3314 Sized_relobj_file<size, big_endian>* relobj,
3315 unsigned int local_sym_index);
3317 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3319 define_tls_base_symbol(Symbol_table*, Layout*);
3321 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3323 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
3325 // Create a GOT entry for the TLS module index.
3327 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
3328 Sized_relobj_file<size, big_endian>* object);
3330 // Get the PLT section.
3331 Output_data_plt_aarch64<size, big_endian>*
3334 gold_assert(this->plt_ != NULL);
3338 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3339 // ST_E_843419, we need an additional field for adrp offset.
3340 void create_erratum_stub(
3341 AArch64_relobj<size, big_endian>* relobj,
3343 section_size_type erratum_insn_offset,
3344 Address erratum_address,
3345 typename Insn_utilities::Insntype erratum_insn,
3347 unsigned int e843419_adrp_offset=0);
3349 // Return whether this is a 3-insn erratum sequence.
3350 bool is_erratum_843419_sequence(
3351 typename elfcpp::Swap<32,big_endian>::Valtype insn1,
3352 typename elfcpp::Swap<32,big_endian>::Valtype insn2,
3353 typename elfcpp::Swap<32,big_endian>::Valtype insn3);
3355 // Return whether this is a 835769 sequence.
3356 // (Similarly implemented as in elfnn-aarch64.c.)
3357 bool is_erratum_835769_sequence(
3358 typename elfcpp::Swap<32,big_endian>::Valtype,
3359 typename elfcpp::Swap<32,big_endian>::Valtype);
3361 // Get the dynamic reloc section, creating it if necessary.
3363 rela_dyn_section(Layout*);
3365 // Get the section to use for TLSDESC relocations.
3367 rela_tlsdesc_section(Layout*) const;
3369 // Get the section to use for IRELATIVE relocations.
3371 rela_irelative_section(Layout*);
3373 // Add a potential copy relocation.
3375 copy_reloc(Symbol_table* symtab, Layout* layout,
3376 Sized_relobj_file<size, big_endian>* object,
3377 unsigned int shndx, Output_section* output_section,
3378 Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc)
3380 unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
3381 this->copy_relocs_.copy_reloc(symtab, layout,
3382 symtab->get_sized_symbol<size>(sym),
3383 object, shndx, output_section,
3384 r_type, reloc.get_r_offset(),
3385 reloc.get_r_addend(),
3386 this->rela_dyn_section(layout));
3389 // Information about this specific target which we pass to the
3390 // general Target structure.
3391 static const Target::Target_info aarch64_info;
3393 // The types of GOT entries needed for this platform.
3394 // These values are exposed to the ABI in an incremental link.
3395 // Do not renumber existing values without changing the version
3396 // number of the .gnu_incremental_inputs section.
3399 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
3400 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
3401 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
3402 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
3405 // This type is used as the argument to the target specific
3406 // relocation routines. The only target specific reloc is
3407 // R_AARCh64_TLSDESC against a local symbol.
3410 Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object,
3411 unsigned int a_r_sym)
3412 : object(a_object), r_sym(a_r_sym)
3415 // The object in which the local symbol is defined.
3416 Sized_relobj_file<size, big_endian>* object;
3417 // The local symbol index in the object.
3422 Output_data_got_aarch64<size, big_endian>* got_;
3424 Output_data_plt_aarch64<size, big_endian>* plt_;
3425 // The GOT PLT section.
3426 Output_data_space* got_plt_;
3427 // The GOT section for IRELATIVE relocations.
3428 Output_data_space* got_irelative_;
3429 // The GOT section for TLSDESC relocations.
3430 Output_data_got<size, big_endian>* got_tlsdesc_;
3431 // The _GLOBAL_OFFSET_TABLE_ symbol.
3432 Symbol* global_offset_table_;
3433 // The dynamic reloc section.
3434 Reloc_section* rela_dyn_;
3435 // The section to use for IRELATIVE relocs.
3436 Reloc_section* rela_irelative_;
3437 // Relocs saved to avoid a COPY reloc.
3438 Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_;
3439 // Offset of the GOT entry for the TLS module index.
3440 unsigned int got_mod_index_offset_;
3441 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3442 // specific relocation. Here we store the object and local symbol
3443 // index for the relocation.
3444 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
3445 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3446 bool tls_base_symbol_defined_;
3447 // List of stub_tables
3448 Stub_table_list stub_tables_;
3449 // Actual stub group size
3450 section_size_type stub_group_size_;
3451 AArch64_input_section_map aarch64_input_section_map_;
3452 }; // End of Target_aarch64
3456 const Target::Target_info Target_aarch64<64, false>::aarch64_info =
3459 false, // is_big_endian
3460 elfcpp::EM_AARCH64, // machine_code
3461 false, // has_make_symbol
3462 false, // has_resolve
3463 false, // has_code_fill
3464 true, // is_default_stack_executable
3465 true, // can_icf_inline_merge_sections
3467 "/lib/ld.so.1", // program interpreter
3468 0x400000, // default_text_segment_address
3469 0x10000, // abi_pagesize (overridable by -z max-page-size)
3470 0x1000, // common_pagesize (overridable by -z common-page-size)
3471 false, // isolate_execinstr
3473 elfcpp::SHN_UNDEF, // small_common_shndx
3474 elfcpp::SHN_UNDEF, // large_common_shndx
3475 0, // small_common_section_flags
3476 0, // large_common_section_flags
3477 NULL, // attributes_section
3478 NULL, // attributes_vendor
3479 "_start", // entry_symbol_name
3480 32, // hash_entry_size
3484 const Target::Target_info Target_aarch64<32, false>::aarch64_info =
3487 false, // is_big_endian
3488 elfcpp::EM_AARCH64, // machine_code
3489 false, // has_make_symbol
3490 false, // has_resolve
3491 false, // has_code_fill
3492 true, // is_default_stack_executable
3493 false, // can_icf_inline_merge_sections
3495 "/lib/ld.so.1", // program interpreter
3496 0x400000, // default_text_segment_address
3497 0x10000, // abi_pagesize (overridable by -z max-page-size)
3498 0x1000, // common_pagesize (overridable by -z common-page-size)
3499 false, // isolate_execinstr
3501 elfcpp::SHN_UNDEF, // small_common_shndx
3502 elfcpp::SHN_UNDEF, // large_common_shndx
3503 0, // small_common_section_flags
3504 0, // large_common_section_flags
3505 NULL, // attributes_section
3506 NULL, // attributes_vendor
3507 "_start", // entry_symbol_name
3508 32, // hash_entry_size
3512 const Target::Target_info Target_aarch64<64, true>::aarch64_info =
3515 true, // is_big_endian
3516 elfcpp::EM_AARCH64, // machine_code
3517 false, // has_make_symbol
3518 false, // has_resolve
3519 false, // has_code_fill
3520 true, // is_default_stack_executable
3521 true, // can_icf_inline_merge_sections
3523 "/lib/ld.so.1", // program interpreter
3524 0x400000, // default_text_segment_address
3525 0x10000, // abi_pagesize (overridable by -z max-page-size)
3526 0x1000, // common_pagesize (overridable by -z common-page-size)
3527 false, // isolate_execinstr
3529 elfcpp::SHN_UNDEF, // small_common_shndx
3530 elfcpp::SHN_UNDEF, // large_common_shndx
3531 0, // small_common_section_flags
3532 0, // large_common_section_flags
3533 NULL, // attributes_section
3534 NULL, // attributes_vendor
3535 "_start", // entry_symbol_name
3536 32, // hash_entry_size
3540 const Target::Target_info Target_aarch64<32, true>::aarch64_info =
3543 true, // is_big_endian
3544 elfcpp::EM_AARCH64, // machine_code
3545 false, // has_make_symbol
3546 false, // has_resolve
3547 false, // has_code_fill
3548 true, // is_default_stack_executable
3549 false, // can_icf_inline_merge_sections
3551 "/lib/ld.so.1", // program interpreter
3552 0x400000, // default_text_segment_address
3553 0x10000, // abi_pagesize (overridable by -z max-page-size)
3554 0x1000, // common_pagesize (overridable by -z common-page-size)
3555 false, // isolate_execinstr
3557 elfcpp::SHN_UNDEF, // small_common_shndx
3558 elfcpp::SHN_UNDEF, // large_common_shndx
3559 0, // small_common_section_flags
3560 0, // large_common_section_flags
3561 NULL, // attributes_section
3562 NULL, // attributes_vendor
3563 "_start", // entry_symbol_name
3564 32, // hash_entry_size
3567 // Get the GOT section, creating it if necessary.
3569 template<int size, bool big_endian>
3570 Output_data_got_aarch64<size, big_endian>*
3571 Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab,
3574 if (this->got_ == NULL)
3576 gold_assert(symtab != NULL && layout != NULL);
3578 // When using -z now, we can treat .got.plt as a relro section.
3579 // Without -z now, it is modified after program startup by lazy
3581 bool is_got_plt_relro = parameters->options().now();
3582 Output_section_order got_order = (is_got_plt_relro
3584 : ORDER_RELRO_LAST);
3585 Output_section_order got_plt_order = (is_got_plt_relro
3587 : ORDER_NON_RELRO_FIRST);
3589 // Layout of .got and .got.plt sections.
3590 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3592 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3593 // .gotplt[1] reserved for ld.so (resolver)
3594 // .gotplt[2] reserved
3596 // Generate .got section.
3597 this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab,
3599 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
3600 (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE),
3601 this->got_, got_order, true);
3602 // The first word of GOT is reserved for the address of .dynamic.
3603 // We put 0 here now. The value will be replaced later in
3604 // Output_data_got_aarch64::do_write.
3605 this->got_->add_constant(0);
3607 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3608 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3609 // even if there is a .got.plt section.
3610 this->global_offset_table_ =
3611 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
3612 Symbol_table::PREDEFINED,
3614 0, 0, elfcpp::STT_OBJECT,
3616 elfcpp::STV_HIDDEN, 0,
3619 // Generate .got.plt section.
3620 this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT");
3621 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3623 | elfcpp::SHF_WRITE),
3624 this->got_plt_, got_plt_order,
3627 // The first three entries are reserved.
3628 this->got_plt_->set_current_data_size(
3629 AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
3631 // If there are any IRELATIVE relocations, they get GOT entries
3632 // in .got.plt after the jump slot entries.
3633 this->got_irelative_ = new Output_data_space(size / 8,
3634 "** GOT IRELATIVE PLT");
3635 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3637 | elfcpp::SHF_WRITE),
3638 this->got_irelative_,
3642 // If there are any TLSDESC relocations, they get GOT entries in
3643 // .got.plt after the jump slot and IRELATIVE entries.
3644 this->got_tlsdesc_ = new Output_data_got<size, big_endian>();
3645 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3647 | elfcpp::SHF_WRITE),
3652 if (!is_got_plt_relro)
3654 // Those bytes can go into the relro segment.
3655 layout->increase_relro(
3656 AARCH64_GOTPLT_RESERVE_COUNT * (size / 8));
3663 // Get the dynamic reloc section, creating it if necessary.
3665 template<int size, bool big_endian>
3666 typename Target_aarch64<size, big_endian>::Reloc_section*
3667 Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout)
3669 if (this->rela_dyn_ == NULL)
3671 gold_assert(layout != NULL);
3672 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
3673 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
3674 elfcpp::SHF_ALLOC, this->rela_dyn_,
3675 ORDER_DYNAMIC_RELOCS, false);
3677 return this->rela_dyn_;
3680 // Get the section to use for IRELATIVE relocs, creating it if
3681 // necessary. These go in .rela.dyn, but only after all other dynamic
3682 // relocations. They need to follow the other dynamic relocations so
3683 // that they can refer to global variables initialized by those
3686 template<int size, bool big_endian>
3687 typename Target_aarch64<size, big_endian>::Reloc_section*
3688 Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout)
3690 if (this->rela_irelative_ == NULL)
3692 // Make sure we have already created the dynamic reloc section.
3693 this->rela_dyn_section(layout);
3694 this->rela_irelative_ = new Reloc_section(false);
3695 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
3696 elfcpp::SHF_ALLOC, this->rela_irelative_,
3697 ORDER_DYNAMIC_RELOCS, false);
3698 gold_assert(this->rela_dyn_->output_section()
3699 == this->rela_irelative_->output_section());
3701 return this->rela_irelative_;
3705 // do_make_elf_object to override the same function in the base class. We need
3706 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3707 // store backend specific information. Hence we need to have our own ELF object
3710 template<int size, bool big_endian>
3712 Target_aarch64<size, big_endian>::do_make_elf_object(
3713 const std::string& name,
3714 Input_file* input_file,
3715 off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr)
3717 int et = ehdr.get_e_type();
3718 // ET_EXEC files are valid input for --just-symbols/-R,
3719 // and we treat them as relocatable objects.
3720 if (et == elfcpp::ET_EXEC && input_file->just_symbols())
3721 return Sized_target<size, big_endian>::do_make_elf_object(
3722 name, input_file, offset, ehdr);
3723 else if (et == elfcpp::ET_REL)
3725 AArch64_relobj<size, big_endian>* obj =
3726 new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr);
3730 else if (et == elfcpp::ET_DYN)
3732 // Keep base implementation.
3733 Sized_dynobj<size, big_endian>* obj =
3734 new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr);
3740 gold_error(_("%s: unsupported ELF file type %d"),
3747 // Scan a relocation for stub generation.
3749 template<int size, bool big_endian>
3751 Target_aarch64<size, big_endian>::scan_reloc_for_stub(
3752 const Relocate_info<size, big_endian>* relinfo,
3753 unsigned int r_type,
3754 const Sized_symbol<size>* gsym,
3756 const Symbol_value<size>* psymval,
3757 typename elfcpp::Elf_types<size>::Elf_Swxword addend,
3760 const AArch64_relobj<size, big_endian>* aarch64_relobj =
3761 static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
3763 Symbol_value<size> symval;
3766 const AArch64_reloc_property* arp = aarch64_reloc_property_table->
3767 get_reloc_property(r_type);
3768 if (gsym->use_plt_offset(arp->reference_flags()))
3770 // This uses a PLT, change the symbol value.
3771 symval.set_output_value(this->plt_section()->address()
3772 + gsym->plt_offset());
3775 else if (gsym->is_undefined())
3777 // There is no need to generate a stub symbol is undefined.
3778 gold_debug(DEBUG_TARGET,
3779 "stub: not creating a stub for undefined symbol %s in file %s",
3780 gsym->name(), aarch64_relobj->name().c_str());
3785 // Get the symbol value.
3786 typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0);
3788 // Owing to pipelining, the PC relative branches below actually skip
3789 // two instructions when the branch offset is 0.
3790 Address destination = static_cast<Address>(-1);
3793 case elfcpp::R_AARCH64_CALL26:
3794 case elfcpp::R_AARCH64_JUMP26:
3795 destination = value + addend;
3801 int stub_type = The_reloc_stub::
3802 stub_type_for_reloc(r_type, address, destination);
3803 if (stub_type == ST_NONE)
3806 The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
3807 gold_assert(stub_table != NULL);
3809 The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend);
3810 The_reloc_stub* stub = stub_table->find_reloc_stub(key);
3813 stub = new The_reloc_stub(stub_type);
3814 stub_table->add_reloc_stub(stub, key);
3816 stub->set_destination_address(destination);
3817 } // End of Target_aarch64::scan_reloc_for_stub
3820 // This function scans a relocation section for stub generation.
3821 // The template parameter Relocate must be a class type which provides
3822 // a single function, relocate(), which implements the machine
3823 // specific part of a relocation.
3825 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3826 // SHT_REL or SHT_RELA.
3828 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3829 // of relocs. OUTPUT_SECTION is the output section.
3830 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3831 // mapped to output offsets.
3833 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3834 // VIEW_SIZE is the size. These refer to the input section, unless
3835 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3836 // the output section.
3838 template<int size, bool big_endian>
3839 template<int sh_type>
3841 Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs(
3842 const Relocate_info<size, big_endian>* relinfo,
3843 const unsigned char* prelocs,
3845 Output_section* /*output_section*/,
3846 bool /*needs_special_offset_handling*/,
3847 const unsigned char* /*view*/,
3848 Address view_address,
3851 typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype;
3853 const int reloc_size =
3854 Reloc_types<sh_type,size,big_endian>::reloc_size;
3855 AArch64_relobj<size, big_endian>* object =
3856 static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object);
3857 unsigned int local_count = object->local_symbol_count();
3859 gold::Default_comdat_behavior default_comdat_behavior;
3860 Comdat_behavior comdat_behavior = CB_UNDETERMINED;
3862 for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size)
3864 Reltype reloc(prelocs);
3865 typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info();
3866 unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info);
3867 unsigned int r_type = elfcpp::elf_r_type<size>(r_info);
3868 if (r_type != elfcpp::R_AARCH64_CALL26
3869 && r_type != elfcpp::R_AARCH64_JUMP26)
3872 section_offset_type offset =
3873 convert_to_section_size_type(reloc.get_r_offset());
3876 typename elfcpp::Elf_types<size>::Elf_Swxword addend =
3877 reloc.get_r_addend();
3879 const Sized_symbol<size>* sym;
3880 Symbol_value<size> symval;
3881 const Symbol_value<size> *psymval;
3882 bool is_defined_in_discarded_section;
3884 if (r_sym < local_count)
3887 psymval = object->local_symbol(r_sym);
3889 // If the local symbol belongs to a section we are discarding,
3890 // and that section is a debug section, try to find the
3891 // corresponding kept section and map this symbol to its
3892 // counterpart in the kept section. The symbol must not
3893 // correspond to a section we are folding.
3895 shndx = psymval->input_shndx(&is_ordinary);
3896 is_defined_in_discarded_section =
3898 && shndx != elfcpp::SHN_UNDEF
3899 && !object->is_section_included(shndx)
3900 && !relinfo->symtab->is_section_folded(object, shndx));
3902 // We need to compute the would-be final value of this local
3904 if (!is_defined_in_discarded_section)
3906 typedef Sized_relobj_file<size, big_endian> ObjType;
3907 if (psymval->is_section_symbol())
3908 symval.set_is_section_symbol();
3909 typename ObjType::Compute_final_local_value_status status =
3910 object->compute_final_local_value(r_sym, psymval, &symval,
3912 if (status == ObjType::CFLV_OK)
3914 // Currently we cannot handle a branch to a target in
3915 // a merged section. If this is the case, issue an error
3916 // and also free the merge symbol value.
3917 if (!symval.has_output_value())
3919 const std::string& section_name =
3920 object->section_name(shndx);
3921 object->error(_("cannot handle branch to local %u "
3922 "in a merged section %s"),
3923 r_sym, section_name.c_str());
3929 // We cannot determine the final value.
3937 gsym = object->global_symbol(r_sym);
3938 gold_assert(gsym != NULL);
3939 if (gsym->is_forwarder())
3940 gsym = relinfo->symtab->resolve_forwards(gsym);
3942 sym = static_cast<const Sized_symbol<size>*>(gsym);
3943 if (sym->has_symtab_index() && sym->symtab_index() != -1U)
3944 symval.set_output_symtab_index(sym->symtab_index());
3946 symval.set_no_output_symtab_entry();
3948 // We need to compute the would-be final value of this global
3950 const Symbol_table* symtab = relinfo->symtab;
3951 const Sized_symbol<size>* sized_symbol =
3952 symtab->get_sized_symbol<size>(gsym);
3953 Symbol_table::Compute_final_value_status status;
3954 typename elfcpp::Elf_types<size>::Elf_Addr value =
3955 symtab->compute_final_value<size>(sized_symbol, &status);
3957 // Skip this if the symbol has not output section.
3958 if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION)
3960 symval.set_output_value(value);
3962 if (gsym->type() == elfcpp::STT_TLS)
3963 symval.set_is_tls_symbol();
3964 else if (gsym->type() == elfcpp::STT_GNU_IFUNC)
3965 symval.set_is_ifunc_symbol();
3968 is_defined_in_discarded_section =
3969 (gsym->is_defined_in_discarded_section()
3970 && gsym->is_undefined());
3974 Symbol_value<size> symval2;
3975 if (is_defined_in_discarded_section)
3977 if (comdat_behavior == CB_UNDETERMINED)
3979 std::string name = object->section_name(relinfo->data_shndx);
3980 comdat_behavior = default_comdat_behavior.get(name.c_str());
3982 if (comdat_behavior == CB_PRETEND)
3985 typename elfcpp::Elf_types<size>::Elf_Addr value =
3986 object->map_to_kept_section(shndx, &found);
3988 symval2.set_output_value(value + psymval->input_value());
3990 symval2.set_output_value(0);
3994 if (comdat_behavior == CB_WARNING)
3995 gold_warning_at_location(relinfo, i, offset,
3996 _("relocation refers to discarded "
3998 symval2.set_output_value(0);
4000 symval2.set_no_output_symtab_entry();
4004 // If symbol is a section symbol, we don't know the actual type of
4005 // destination. Give up.
4006 if (psymval->is_section_symbol())
4009 this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval,
4010 addend, view_address + offset);
4011 } // End of iterating relocs in a section
4012 } // End of Target_aarch64::scan_reloc_section_for_stubs
4015 // Scan an input section for stub generation.
4017 template<int size, bool big_endian>
4019 Target_aarch64<size, big_endian>::scan_section_for_stubs(
4020 const Relocate_info<size, big_endian>* relinfo,
4021 unsigned int sh_type,
4022 const unsigned char* prelocs,
4024 Output_section* output_section,
4025 bool needs_special_offset_handling,
4026 const unsigned char* view,
4027 Address view_address,
4028 section_size_type view_size)
4030 gold_assert(sh_type == elfcpp::SHT_RELA);
4031 this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>(
4036 needs_special_offset_handling,
4043 // Relocate a single stub.
4045 template<int size, bool big_endian>
4046 void Target_aarch64<size, big_endian>::
4047 relocate_stub(The_reloc_stub* stub,
4048 const The_relocate_info*,
4050 unsigned char* view,
4054 typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions;
4055 typedef typename The_reloc_functions::Status The_reloc_functions_status;
4056 typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype;
4058 Insntype* ip = reinterpret_cast<Insntype*>(view);
4059 int insn_number = stub->insn_num();
4060 const uint32_t* insns = stub->insns();
4061 // Check the insns are really those stub insns.
4062 for (int i = 0; i < insn_number; ++i)
4064 Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i);
4065 gold_assert(((uint32_t)insn == insns[i]));
4068 Address dest = stub->destination_address();
4070 switch(stub->type())
4072 case ST_ADRP_BRANCH:
4074 // 1st reloc is ADR_PREL_PG_HI21
4075 The_reloc_functions_status status =
4076 The_reloc_functions::adrp(view, dest, address);
4077 // An error should never arise in the above step. If so, please
4078 // check 'aarch64_valid_for_adrp_p'.
4079 gold_assert(status == The_reloc_functions::STATUS_OKAY);
4081 // 2nd reloc is ADD_ABS_LO12_NC
4082 const AArch64_reloc_property* arp =
4083 aarch64_reloc_property_table->get_reloc_property(
4084 elfcpp::R_AARCH64_ADD_ABS_LO12_NC);
4085 gold_assert(arp != NULL);
4086 status = The_reloc_functions::template
4087 rela_general<32>(view + 4, dest, 0, arp);
4088 // An error should never arise, it is an "_NC" relocation.
4089 gold_assert(status == The_reloc_functions::STATUS_OKAY);
4093 case ST_LONG_BRANCH_ABS:
4094 // 1st reloc is R_AARCH64_PREL64, at offset 8
4095 elfcpp::Swap<64,big_endian>::writeval(view + 8, dest);
4098 case ST_LONG_BRANCH_PCREL:
4100 // "PC" calculation is the 2nd insn in the stub.
4101 uint64_t offset = dest - (address + 4);
4102 // Offset is placed at offset 4 and 5.
4103 elfcpp::Swap<64,big_endian>::writeval(view + 16, offset);
4113 // A class to handle the PLT data.
4114 // This is an abstract base class that handles most of the linker details
4115 // but does not know the actual contents of PLT entries. The derived
4116 // classes below fill in those details.
4118 template<int size, bool big_endian>
4119 class Output_data_plt_aarch64 : public Output_section_data
4122 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
4124 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4126 Output_data_plt_aarch64(Layout* layout,
4128 Output_data_got_aarch64<size, big_endian>* got,
4129 Output_data_space* got_plt,
4130 Output_data_space* got_irelative)
4131 : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL),
4132 got_(got), got_plt_(got_plt), got_irelative_(got_irelative),
4133 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4134 { this->init(layout); }
4136 // Initialize the PLT section.
4138 init(Layout* layout);
4140 // Add an entry to the PLT.
4142 add_entry(Symbol_table*, Layout*, Symbol* gsym);
4144 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4146 add_local_ifunc_entry(Symbol_table* symtab, Layout*,
4147 Sized_relobj_file<size, big_endian>* relobj,
4148 unsigned int local_sym_index);
4150 // Add the relocation for a PLT entry.
4152 add_relocation(Symbol_table*, Layout*, Symbol* gsym,
4153 unsigned int got_offset);
4155 // Add the reserved TLSDESC_PLT entry to the PLT.
4157 reserve_tlsdesc_entry(unsigned int got_offset)
4158 { this->tlsdesc_got_offset_ = got_offset; }
4160 // Return true if a TLSDESC_PLT entry has been reserved.
4162 has_tlsdesc_entry() const
4163 { return this->tlsdesc_got_offset_ != -1U; }
4165 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4167 get_tlsdesc_got_offset() const
4168 { return this->tlsdesc_got_offset_; }
4170 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4172 get_tlsdesc_plt_offset() const
4174 return (this->first_plt_entry_offset() +
4175 (this->count_ + this->irelative_count_)
4176 * this->get_plt_entry_size());
4179 // Return the .rela.plt section data.
4182 { return this->rel_; }
4184 // Return where the TLSDESC relocations should go.
4186 rela_tlsdesc(Layout*);
4188 // Return where the IRELATIVE relocations should go in the PLT
4191 rela_irelative(Symbol_table*, Layout*);
4193 // Return whether we created a section for IRELATIVE relocations.
4195 has_irelative_section() const
4196 { return this->irelative_rel_ != NULL; }
4198 // Return the number of PLT entries.
4201 { return this->count_ + this->irelative_count_; }
4203 // Return the offset of the first non-reserved PLT entry.
4205 first_plt_entry_offset() const
4206 { return this->do_first_plt_entry_offset(); }
4208 // Return the size of a PLT entry.
4210 get_plt_entry_size() const
4211 { return this->do_get_plt_entry_size(); }
4213 // Return the reserved tlsdesc entry size.
4215 get_plt_tlsdesc_entry_size() const
4216 { return this->do_get_plt_tlsdesc_entry_size(); }
4218 // Return the PLT address to use for a global symbol.
4220 address_for_global(const Symbol*);
4222 // Return the PLT address to use for a local symbol.
4224 address_for_local(const Relobj*, unsigned int symndx);
4227 // Fill in the first PLT entry.
4229 fill_first_plt_entry(unsigned char* pov,
4230 Address got_address,
4231 Address plt_address)
4232 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
4234 // Fill in a normal PLT entry.
4236 fill_plt_entry(unsigned char* pov,
4237 Address got_address,
4238 Address plt_address,
4239 unsigned int got_offset,
4240 unsigned int plt_offset)
4242 this->do_fill_plt_entry(pov, got_address, plt_address,
4243 got_offset, plt_offset);
4246 // Fill in the reserved TLSDESC PLT entry.
4248 fill_tlsdesc_entry(unsigned char* pov,
4249 Address gotplt_address,
4250 Address plt_address,
4252 unsigned int tlsdesc_got_offset,
4253 unsigned int plt_offset)
4255 this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
4256 tlsdesc_got_offset, plt_offset);
4259 virtual unsigned int
4260 do_first_plt_entry_offset() const = 0;
4262 virtual unsigned int
4263 do_get_plt_entry_size() const = 0;
4265 virtual unsigned int
4266 do_get_plt_tlsdesc_entry_size() const = 0;
4269 do_fill_first_plt_entry(unsigned char* pov,
4271 Address plt_addr) = 0;
4274 do_fill_plt_entry(unsigned char* pov,
4275 Address got_address,
4276 Address plt_address,
4277 unsigned int got_offset,
4278 unsigned int plt_offset) = 0;
4281 do_fill_tlsdesc_entry(unsigned char* pov,
4282 Address gotplt_address,
4283 Address plt_address,
4285 unsigned int tlsdesc_got_offset,
4286 unsigned int plt_offset) = 0;
4289 do_adjust_output_section(Output_section* os);
4291 // Write to a map file.
4293 do_print_to_mapfile(Mapfile* mapfile) const
4294 { mapfile->print_output_data(this, _("** PLT")); }
4297 // Set the final size.
4299 set_final_data_size();
4301 // Write out the PLT data.
4303 do_write(Output_file*);
4305 // The reloc section.
4306 Reloc_section* rel_;
4308 // The TLSDESC relocs, if necessary. These must follow the regular
4310 Reloc_section* tlsdesc_rel_;
4312 // The IRELATIVE relocs, if necessary. These must follow the
4313 // regular PLT relocations.
4314 Reloc_section* irelative_rel_;
4316 // The .got section.
4317 Output_data_got_aarch64<size, big_endian>* got_;
4319 // The .got.plt section.
4320 Output_data_space* got_plt_;
4322 // The part of the .got.plt section used for IRELATIVE relocs.
4323 Output_data_space* got_irelative_;
4325 // The number of PLT entries.
4326 unsigned int count_;
4328 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4329 // follow the regular PLT entries.
4330 unsigned int irelative_count_;
4332 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4333 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4334 // indicates an offset is not allocated.
4335 unsigned int tlsdesc_got_offset_;
4338 // Initialize the PLT section.
4340 template<int size, bool big_endian>
4342 Output_data_plt_aarch64<size, big_endian>::init(Layout* layout)
4344 this->rel_ = new Reloc_section(false);
4345 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4346 elfcpp::SHF_ALLOC, this->rel_,
4347 ORDER_DYNAMIC_PLT_RELOCS, false);
4350 template<int size, bool big_endian>
4352 Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section(
4355 os->set_entsize(this->get_plt_entry_size());
4358 // Add an entry to the PLT.
4360 template<int size, bool big_endian>
4362 Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab,
4363 Layout* layout, Symbol* gsym)
4365 gold_assert(!gsym->has_plt_offset());
4367 unsigned int* pcount;
4368 unsigned int plt_reserved;
4369 Output_section_data_build* got;
4371 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4372 && gsym->can_use_relative_reloc(false))
4374 pcount = &this->irelative_count_;
4376 got = this->got_irelative_;
4380 pcount = &this->count_;
4381 plt_reserved = this->first_plt_entry_offset();
4382 got = this->got_plt_;
4385 gsym->set_plt_offset((*pcount) * this->get_plt_entry_size()
4390 section_offset_type got_offset = got->current_data_size();
4392 // Every PLT entry needs a GOT entry which points back to the PLT
4393 // entry (this will be changed by the dynamic linker, normally
4394 // lazily when the function is called).
4395 got->set_current_data_size(got_offset + size / 8);
4397 // Every PLT entry needs a reloc.
4398 this->add_relocation(symtab, layout, gsym, got_offset);
4400 // Note that we don't need to save the symbol. The contents of the
4401 // PLT are independent of which symbols are used. The symbols only
4402 // appear in the relocations.
4405 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4408 template<int size, bool big_endian>
4410 Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry(
4411 Symbol_table* symtab,
4413 Sized_relobj_file<size, big_endian>* relobj,
4414 unsigned int local_sym_index)
4416 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
4417 ++this->irelative_count_;
4419 section_offset_type got_offset = this->got_irelative_->current_data_size();
4421 // Every PLT entry needs a GOT entry which points back to the PLT
4423 this->got_irelative_->set_current_data_size(got_offset + size / 8);
4425 // Every PLT entry needs a reloc.
4426 Reloc_section* rela = this->rela_irelative(symtab, layout);
4427 rela->add_symbolless_local_addend(relobj, local_sym_index,
4428 elfcpp::R_AARCH64_IRELATIVE,
4429 this->got_irelative_, got_offset, 0);
4434 // Add the relocation for a PLT entry.
4436 template<int size, bool big_endian>
4438 Output_data_plt_aarch64<size, big_endian>::add_relocation(
4439 Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset)
4441 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4442 && gsym->can_use_relative_reloc(false))
4444 Reloc_section* rela = this->rela_irelative(symtab, layout);
4445 rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE,
4446 this->got_irelative_, got_offset, 0);
4450 gsym->set_needs_dynsym_entry();
4451 this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_,
4456 // Return where the TLSDESC relocations should go, creating it if
4457 // necessary. These follow the JUMP_SLOT relocations.
4459 template<int size, bool big_endian>
4460 typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
4461 Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout)
4463 if (this->tlsdesc_rel_ == NULL)
4465 this->tlsdesc_rel_ = new Reloc_section(false);
4466 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4467 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
4468 ORDER_DYNAMIC_PLT_RELOCS, false);
4469 gold_assert(this->tlsdesc_rel_->output_section()
4470 == this->rel_->output_section());
4472 return this->tlsdesc_rel_;
4475 // Return where the IRELATIVE relocations should go in the PLT. These
4476 // follow the JUMP_SLOT and the TLSDESC relocations.
4478 template<int size, bool big_endian>
4479 typename Output_data_plt_aarch64<size, big_endian>::Reloc_section*
4480 Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab,
4483 if (this->irelative_rel_ == NULL)
4485 // Make sure we have a place for the TLSDESC relocations, in
4486 // case we see any later on.
4487 this->rela_tlsdesc(layout);
4488 this->irelative_rel_ = new Reloc_section(false);
4489 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
4490 elfcpp::SHF_ALLOC, this->irelative_rel_,
4491 ORDER_DYNAMIC_PLT_RELOCS, false);
4492 gold_assert(this->irelative_rel_->output_section()
4493 == this->rel_->output_section());
4495 if (parameters->doing_static_link())
4497 // A statically linked executable will only have a .rela.plt
4498 // section to hold R_AARCH64_IRELATIVE relocs for
4499 // STT_GNU_IFUNC symbols. The library will use these
4500 // symbols to locate the IRELATIVE relocs at program startup
4502 symtab->define_in_output_data("__rela_iplt_start", NULL,
4503 Symbol_table::PREDEFINED,
4504 this->irelative_rel_, 0, 0,
4505 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
4506 elfcpp::STV_HIDDEN, 0, false, true);
4507 symtab->define_in_output_data("__rela_iplt_end", NULL,
4508 Symbol_table::PREDEFINED,
4509 this->irelative_rel_, 0, 0,
4510 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
4511 elfcpp::STV_HIDDEN, 0, true, true);
4514 return this->irelative_rel_;
4517 // Return the PLT address to use for a global symbol.
4519 template<int size, bool big_endian>
4521 Output_data_plt_aarch64<size, big_endian>::address_for_global(
4524 uint64_t offset = 0;
4525 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4526 && gsym->can_use_relative_reloc(false))
4527 offset = (this->first_plt_entry_offset() +
4528 this->count_ * this->get_plt_entry_size());
4529 return this->address() + offset + gsym->plt_offset();
4532 // Return the PLT address to use for a local symbol. These are always
4533 // IRELATIVE relocs.
4535 template<int size, bool big_endian>
4537 Output_data_plt_aarch64<size, big_endian>::address_for_local(
4538 const Relobj* object,
4541 return (this->address()
4542 + this->first_plt_entry_offset()
4543 + this->count_ * this->get_plt_entry_size()
4544 + object->local_plt_offset(r_sym));
4547 // Set the final size.
4549 template<int size, bool big_endian>
4551 Output_data_plt_aarch64<size, big_endian>::set_final_data_size()
4553 unsigned int count = this->count_ + this->irelative_count_;
4554 unsigned int extra_size = 0;
4555 if (this->has_tlsdesc_entry())
4556 extra_size += this->get_plt_tlsdesc_entry_size();
4557 this->set_data_size(this->first_plt_entry_offset()
4558 + count * this->get_plt_entry_size()
4562 template<int size, bool big_endian>
4563 class Output_data_plt_aarch64_standard :
4564 public Output_data_plt_aarch64<size, big_endian>
4567 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
4568 Output_data_plt_aarch64_standard(
4570 Output_data_got_aarch64<size, big_endian>* got,
4571 Output_data_space* got_plt,
4572 Output_data_space* got_irelative)
4573 : Output_data_plt_aarch64<size, big_endian>(layout,
4580 // Return the offset of the first non-reserved PLT entry.
4581 virtual unsigned int
4582 do_first_plt_entry_offset() const
4583 { return this->first_plt_entry_size; }
4585 // Return the size of a PLT entry
4586 virtual unsigned int
4587 do_get_plt_entry_size() const
4588 { return this->plt_entry_size; }
4590 // Return the size of a tlsdesc entry
4591 virtual unsigned int
4592 do_get_plt_tlsdesc_entry_size() const
4593 { return this->plt_tlsdesc_entry_size; }
4596 do_fill_first_plt_entry(unsigned char* pov,
4597 Address got_address,
4598 Address plt_address);
4601 do_fill_plt_entry(unsigned char* pov,
4602 Address got_address,
4603 Address plt_address,
4604 unsigned int got_offset,
4605 unsigned int plt_offset);
4608 do_fill_tlsdesc_entry(unsigned char* pov,
4609 Address gotplt_address,
4610 Address plt_address,
4612 unsigned int tlsdesc_got_offset,
4613 unsigned int plt_offset);
4616 // The size of the first plt entry size.
4617 static const int first_plt_entry_size = 32;
4618 // The size of the plt entry size.
4619 static const int plt_entry_size = 16;
4620 // The size of the plt tlsdesc entry size.
4621 static const int plt_tlsdesc_entry_size = 32;
4622 // Template for the first PLT entry.
4623 static const uint32_t first_plt_entry[first_plt_entry_size / 4];
4624 // Template for subsequent PLT entries.
4625 static const uint32_t plt_entry[plt_entry_size / 4];
4626 // The reserved TLSDESC entry in the PLT for an executable.
4627 static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4];
4630 // The first entry in the PLT for an executable.
4634 Output_data_plt_aarch64_standard<32, false>::
4635 first_plt_entry[first_plt_entry_size / 4] =
4637 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4638 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4639 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4640 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4641 0xd61f0220, /* br x17 */
4642 0xd503201f, /* nop */
4643 0xd503201f, /* nop */
4644 0xd503201f, /* nop */
4650 Output_data_plt_aarch64_standard<32, true>::
4651 first_plt_entry[first_plt_entry_size / 4] =
4653 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4654 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4655 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4656 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4657 0xd61f0220, /* br x17 */
4658 0xd503201f, /* nop */
4659 0xd503201f, /* nop */
4660 0xd503201f, /* nop */
4666 Output_data_plt_aarch64_standard<64, false>::
4667 first_plt_entry[first_plt_entry_size / 4] =
4669 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4670 0x90000010, /* adrp x16, PLT_GOT+16 */
4671 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4672 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4673 0xd61f0220, /* br x17 */
4674 0xd503201f, /* nop */
4675 0xd503201f, /* nop */
4676 0xd503201f, /* nop */
4682 Output_data_plt_aarch64_standard<64, true>::
4683 first_plt_entry[first_plt_entry_size / 4] =
4685 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4686 0x90000010, /* adrp x16, PLT_GOT+16 */
4687 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4688 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4689 0xd61f0220, /* br x17 */
4690 0xd503201f, /* nop */
4691 0xd503201f, /* nop */
4692 0xd503201f, /* nop */
4698 Output_data_plt_aarch64_standard<32, false>::
4699 plt_entry[plt_entry_size / 4] =
4701 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4702 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4703 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4704 0xd61f0220, /* br x17. */
4710 Output_data_plt_aarch64_standard<32, true>::
4711 plt_entry[plt_entry_size / 4] =
4713 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4714 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4715 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4716 0xd61f0220, /* br x17. */
4722 Output_data_plt_aarch64_standard<64, false>::
4723 plt_entry[plt_entry_size / 4] =
4725 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4726 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4727 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4728 0xd61f0220, /* br x17. */
4734 Output_data_plt_aarch64_standard<64, true>::
4735 plt_entry[plt_entry_size / 4] =
4737 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4738 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4739 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4740 0xd61f0220, /* br x17. */
4744 template<int size, bool big_endian>
4746 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry(
4748 Address got_address,
4749 Address plt_address)
4751 // PLT0 of the small PLT looks like this in ELF64 -
4752 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4753 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4754 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4756 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4757 // GOTPLT entry for this.
4759 // PLT0 will be slightly different in ELF32 due to different got entry
4761 memcpy(pov, this->first_plt_entry, this->first_plt_entry_size);
4762 Address gotplt_2nd_ent = got_address + (size / 8) * 2;
4764 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4765 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4766 // FIXME: This only works for 64bit
4767 AArch64_relocate_functions<size, big_endian>::adrp(pov + 4,
4768 gotplt_2nd_ent, plt_address + 4);
4770 // Fill in R_AARCH64_LDST8_LO12
4771 elfcpp::Swap<32, big_endian>::writeval(
4773 ((this->first_plt_entry[2] & 0xffc003ff)
4774 | ((gotplt_2nd_ent & 0xff8) << 7)));
4776 // Fill in R_AARCH64_ADD_ABS_LO12
4777 elfcpp::Swap<32, big_endian>::writeval(
4779 ((this->first_plt_entry[3] & 0xffc003ff)
4780 | ((gotplt_2nd_ent & 0xfff) << 10)));
4784 // Subsequent entries in the PLT for an executable.
4785 // FIXME: This only works for 64bit
4787 template<int size, bool big_endian>
4789 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry(
4791 Address got_address,
4792 Address plt_address,
4793 unsigned int got_offset,
4794 unsigned int plt_offset)
4796 memcpy(pov, this->plt_entry, this->plt_entry_size);
4798 Address gotplt_entry_address = got_address + got_offset;
4799 Address plt_entry_address = plt_address + plt_offset;
4801 // Fill in R_AARCH64_PCREL_ADR_HI21
4802 AArch64_relocate_functions<size, big_endian>::adrp(
4804 gotplt_entry_address,
4807 // Fill in R_AARCH64_LDST64_ABS_LO12
4808 elfcpp::Swap<32, big_endian>::writeval(
4810 ((this->plt_entry[1] & 0xffc003ff)
4811 | ((gotplt_entry_address & 0xff8) << 7)));
4813 // Fill in R_AARCH64_ADD_ABS_LO12
4814 elfcpp::Swap<32, big_endian>::writeval(
4816 ((this->plt_entry[2] & 0xffc003ff)
4817 | ((gotplt_entry_address & 0xfff) <<10)));
4824 Output_data_plt_aarch64_standard<32, false>::
4825 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4827 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4828 0x90000002, /* adrp x2, 0 */
4829 0x90000003, /* adrp x3, 0 */
4830 0xb9400042, /* ldr w2, [w2, #0] */
4831 0x11000063, /* add w3, w3, 0 */
4832 0xd61f0040, /* br x2 */
4833 0xd503201f, /* nop */
4834 0xd503201f, /* nop */
4839 Output_data_plt_aarch64_standard<32, true>::
4840 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4842 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4843 0x90000002, /* adrp x2, 0 */
4844 0x90000003, /* adrp x3, 0 */
4845 0xb9400042, /* ldr w2, [w2, #0] */
4846 0x11000063, /* add w3, w3, 0 */
4847 0xd61f0040, /* br x2 */
4848 0xd503201f, /* nop */
4849 0xd503201f, /* nop */
4854 Output_data_plt_aarch64_standard<64, false>::
4855 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4857 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4858 0x90000002, /* adrp x2, 0 */
4859 0x90000003, /* adrp x3, 0 */
4860 0xf9400042, /* ldr x2, [x2, #0] */
4861 0x91000063, /* add x3, x3, 0 */
4862 0xd61f0040, /* br x2 */
4863 0xd503201f, /* nop */
4864 0xd503201f, /* nop */
4869 Output_data_plt_aarch64_standard<64, true>::
4870 tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] =
4872 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4873 0x90000002, /* adrp x2, 0 */
4874 0x90000003, /* adrp x3, 0 */
4875 0xf9400042, /* ldr x2, [x2, #0] */
4876 0x91000063, /* add x3, x3, 0 */
4877 0xd61f0040, /* br x2 */
4878 0xd503201f, /* nop */
4879 0xd503201f, /* nop */
4882 template<int size, bool big_endian>
4884 Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry(
4886 Address gotplt_address,
4887 Address plt_address,
4889 unsigned int tlsdesc_got_offset,
4890 unsigned int plt_offset)
4892 memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size);
4894 // move DT_TLSDESC_GOT address into x2
4895 // move .got.plt address into x3
4896 Address tlsdesc_got_entry = got_base + tlsdesc_got_offset;
4897 Address plt_entry_address = plt_address + plt_offset;
4899 // R_AARCH64_ADR_PREL_PG_HI21
4900 AArch64_relocate_functions<size, big_endian>::adrp(
4903 plt_entry_address + 4);
4905 // R_AARCH64_ADR_PREL_PG_HI21
4906 AArch64_relocate_functions<size, big_endian>::adrp(
4909 plt_entry_address + 8);
4911 // R_AARCH64_LDST64_ABS_LO12
4912 elfcpp::Swap<32, big_endian>::writeval(
4914 ((this->tlsdesc_plt_entry[3] & 0xffc003ff)
4915 | ((tlsdesc_got_entry & 0xff8) << 7)));
4917 // R_AARCH64_ADD_ABS_LO12
4918 elfcpp::Swap<32, big_endian>::writeval(
4920 ((this->tlsdesc_plt_entry[4] & 0xffc003ff)
4921 | ((gotplt_address & 0xfff) << 10)));
4924 // Write out the PLT. This uses the hand-coded instructions above,
4925 // and adjusts them as needed. This is specified by the AMD64 ABI.
4927 template<int size, bool big_endian>
4929 Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of)
4931 const off_t offset = this->offset();
4932 const section_size_type oview_size =
4933 convert_to_section_size_type(this->data_size());
4934 unsigned char* const oview = of->get_output_view(offset, oview_size);
4936 const off_t got_file_offset = this->got_plt_->offset();
4937 gold_assert(got_file_offset + this->got_plt_->data_size()
4938 == this->got_irelative_->offset());
4940 const section_size_type got_size =
4941 convert_to_section_size_type(this->got_plt_->data_size()
4942 + this->got_irelative_->data_size());
4943 unsigned char* const got_view = of->get_output_view(got_file_offset,
4946 unsigned char* pov = oview;
4948 // The base address of the .plt section.
4949 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
4950 // The base address of the PLT portion of the .got section.
4951 typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address
4952 = this->got_plt_->address();
4954 this->fill_first_plt_entry(pov, gotplt_address, plt_address);
4955 pov += this->first_plt_entry_offset();
4957 // The first three entries in .got.plt are reserved.
4958 unsigned char* got_pov = got_view;
4959 memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT);
4960 got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
4962 unsigned int plt_offset = this->first_plt_entry_offset();
4963 unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT;
4964 const unsigned int count = this->count_ + this->irelative_count_;
4965 for (unsigned int plt_index = 0;
4968 pov += this->get_plt_entry_size(),
4969 got_pov += size / 8,
4970 plt_offset += this->get_plt_entry_size(),
4971 got_offset += size / 8)
4973 // Set and adjust the PLT entry itself.
4974 this->fill_plt_entry(pov, gotplt_address, plt_address,
4975 got_offset, plt_offset);
4977 // Set the entry in the GOT, which points to plt0.
4978 elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address);
4981 if (this->has_tlsdesc_entry())
4983 // Set and adjust the reserved TLSDESC PLT entry.
4984 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
4985 // The base address of the .base section.
4986 typename elfcpp::Elf_types<size>::Elf_Addr got_base =
4987 this->got_->address();
4988 this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base,
4989 tlsdesc_got_offset, plt_offset);
4990 pov += this->get_plt_tlsdesc_entry_size();
4993 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
4994 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
4996 of->write_output_view(offset, oview_size, oview);
4997 of->write_output_view(got_file_offset, got_size, got_view);
5000 // Telling how to update the immediate field of an instruction.
5001 struct AArch64_howto
5003 // The immediate field mask.
5004 elfcpp::Elf_Xword dst_mask;
5006 // The offset to apply relocation immediate
5009 // The second part offset, if the immediate field has two parts.
5010 // -1 if the immediate field has only one part.
5014 static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] =
5016 {0, -1, -1}, // DATA
5017 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
5018 {0xffffe0, 5, -1}, // LD [23:5]-imm19
5019 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
5020 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
5021 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
5022 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
5023 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
5024 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
5025 {0x3ffffff, 0, -1}, // B [25:0]-imm26
5026 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
5029 // AArch64 relocate function class
5031 template<int size, bool big_endian>
5032 class AArch64_relocate_functions
5037 STATUS_OKAY, // No error during relocation.
5038 STATUS_OVERFLOW, // Relocation overflow.
5039 STATUS_BAD_RELOC, // Relocation cannot be applied.
5042 typedef AArch64_relocate_functions<size, big_endian> This;
5043 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
5044 typedef Relocate_info<size, big_endian> The_relocate_info;
5045 typedef AArch64_relobj<size, big_endian> The_aarch64_relobj;
5046 typedef Reloc_stub<size, big_endian> The_reloc_stub;
5047 typedef Stub_table<size, big_endian> The_stub_table;
5048 typedef elfcpp::Rela<size, big_endian> The_rela;
5049 typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype;
5051 // Return the page address of the address.
5052 // Page(address) = address & ~0xFFF
5054 static inline AArch64_valtype
5055 Page(Address address)
5057 return (address & (~static_cast<Address>(0xFFF)));
5061 // Update instruction (pointed by view) with selected bits (immed).
5062 // val = (val & ~dst_mask) | (immed << doffset)
5064 template<int valsize>
5066 update_view(unsigned char* view,
5067 AArch64_valtype immed,
5068 elfcpp::Elf_Xword doffset,
5069 elfcpp::Elf_Xword dst_mask)
5071 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5072 Valtype* wv = reinterpret_cast<Valtype*>(view);
5073 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
5075 // Clear immediate fields.
5077 elfcpp::Swap<valsize, big_endian>::writeval(wv,
5078 static_cast<Valtype>(val | (immed << doffset)));
5081 // Update two parts of an instruction (pointed by view) with selected
5082 // bits (immed1 and immed2).
5083 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5085 template<int valsize>
5087 update_view_two_parts(
5088 unsigned char* view,
5089 AArch64_valtype immed1,
5090 AArch64_valtype immed2,
5091 elfcpp::Elf_Xword doffset1,
5092 elfcpp::Elf_Xword doffset2,
5093 elfcpp::Elf_Xword dst_mask)
5095 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5096 Valtype* wv = reinterpret_cast<Valtype*>(view);
5097 Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv);
5099 elfcpp::Swap<valsize, big_endian>::writeval(wv,
5100 static_cast<Valtype>(val | (immed1 << doffset1) |
5101 (immed2 << doffset2)));
5104 // Update adr or adrp instruction with immed.
5105 // In adr and adrp: [30:29] immlo [23:5] immhi
5108 update_adr(unsigned char* view, AArch64_valtype immed)
5110 elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5);
5111 This::template update_view_two_parts<32>(
5114 (immed & 0x1ffffc) >> 2,
5120 // Update movz/movn instruction with bits immed.
5121 // Set instruction to movz if is_movz is true, otherwise set instruction
5125 update_movnz(unsigned char* view,
5126 AArch64_valtype immed,
5129 typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype;
5130 Valtype* wv = reinterpret_cast<Valtype*>(view);
5131 Valtype val = elfcpp::Swap<32, big_endian>::readval(wv);
5133 const elfcpp::Elf_Xword doffset =
5134 aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset;
5135 const elfcpp::Elf_Xword dst_mask =
5136 aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask;
5138 // Clear immediate fields and opc code.
5139 val &= ~(dst_mask | (0x3 << 29));
5141 // Set instruction to movz or movn.
5142 // movz: [30:29] is 10 movn: [30:29] is 00
5146 elfcpp::Swap<32, big_endian>::writeval(wv,
5147 static_cast<Valtype>(val | (immed << doffset)));
5152 // Update selected bits in text.
5154 template<int valsize>
5155 static inline typename This::Status
5156 reloc_common(unsigned char* view, Address x,
5157 const AArch64_reloc_property* reloc_property)
5159 // Select bits from X.
5160 Address immed = reloc_property->select_x_value(x);
5163 const AArch64_reloc_property::Reloc_inst inst =
5164 reloc_property->reloc_inst();
5165 // If it is a data relocation or instruction has 2 parts of immediate
5166 // fields, you should not call pcrela_general.
5167 gold_assert(aarch64_howto[inst].doffset2 == -1 &&
5168 aarch64_howto[inst].doffset != -1);
5169 This::template update_view<valsize>(view, immed,
5170 aarch64_howto[inst].doffset,
5171 aarch64_howto[inst].dst_mask);
5173 // Do check overflow or alignment if needed.
5174 return (reloc_property->checkup_x_value(x)
5176 : This::STATUS_OVERFLOW);
5179 // Construct a B insn. Note, although we group it here with other relocation
5180 // operation, there is actually no 'relocation' involved here.
5182 construct_b(unsigned char* view, unsigned int branch_offset)
5184 update_view_two_parts<32>(view, 0x05, (branch_offset >> 2),
5188 // Do a simple rela relocation at unaligned addresses.
5190 template<int valsize>
5191 static inline typename This::Status
5192 rela_ua(unsigned char* view,
5193 const Sized_relobj_file<size, big_endian>* object,
5194 const Symbol_value<size>* psymval,
5195 AArch64_valtype addend,
5196 const AArch64_reloc_property* reloc_property)
5198 typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
5200 typename elfcpp::Elf_types<size>::Elf_Addr x =
5201 psymval->value(object, addend);
5202 elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
5203 static_cast<Valtype>(x));
5204 return (reloc_property->checkup_x_value(x)
5206 : This::STATUS_OVERFLOW);
5209 // Do a simple pc-relative relocation at unaligned addresses.
5211 template<int valsize>
5212 static inline typename This::Status
5213 pcrela_ua(unsigned char* view,
5214 const Sized_relobj_file<size, big_endian>* object,
5215 const Symbol_value<size>* psymval,
5216 AArch64_valtype addend,
5218 const AArch64_reloc_property* reloc_property)
5220 typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype
5222 Address x = psymval->value(object, addend) - address;
5223 elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view,
5224 static_cast<Valtype>(x));
5225 return (reloc_property->checkup_x_value(x)
5227 : This::STATUS_OVERFLOW);
5230 // Do a simple rela relocation at aligned addresses.
5232 template<int valsize>
5233 static inline typename This::Status
5235 unsigned char* view,
5236 const Sized_relobj_file<size, big_endian>* object,
5237 const Symbol_value<size>* psymval,
5238 AArch64_valtype addend,
5239 const AArch64_reloc_property* reloc_property)
5241 typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype;
5242 Valtype* wv = reinterpret_cast<Valtype*>(view);
5243 Address x = psymval->value(object, addend);
5244 elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x));
5245 return (reloc_property->checkup_x_value(x)
5247 : This::STATUS_OVERFLOW);
5250 // Do relocate. Update selected bits in text.
5251 // new_val = (val & ~dst_mask) | (immed << doffset)
5253 template<int valsize>
5254 static inline typename This::Status
5255 rela_general(unsigned char* view,
5256 const Sized_relobj_file<size, big_endian>* object,
5257 const Symbol_value<size>* psymval,
5258 AArch64_valtype addend,
5259 const AArch64_reloc_property* reloc_property)
5261 // Calculate relocation.
5262 Address x = psymval->value(object, addend);
5263 return This::template reloc_common<valsize>(view, x, reloc_property);
5266 // Do relocate. Update selected bits in text.
5267 // new val = (val & ~dst_mask) | (immed << doffset)
5269 template<int valsize>
5270 static inline typename This::Status
5272 unsigned char* view,
5274 AArch64_valtype addend,
5275 const AArch64_reloc_property* reloc_property)
5277 // Calculate relocation.
5278 Address x = s + addend;
5279 return This::template reloc_common<valsize>(view, x, reloc_property);
5282 // Do address relative relocate. Update selected bits in text.
5283 // new val = (val & ~dst_mask) | (immed << doffset)
5285 template<int valsize>
5286 static inline typename This::Status
5288 unsigned char* view,
5289 const Sized_relobj_file<size, big_endian>* object,
5290 const Symbol_value<size>* psymval,
5291 AArch64_valtype addend,
5293 const AArch64_reloc_property* reloc_property)
5295 // Calculate relocation.
5296 Address x = psymval->value(object, addend) - address;
5297 return This::template reloc_common<valsize>(view, x, reloc_property);
5301 // Calculate (S + A) - address, update adr instruction.
5303 static inline typename This::Status
5304 adr(unsigned char* view,
5305 const Sized_relobj_file<size, big_endian>* object,
5306 const Symbol_value<size>* psymval,
5309 const AArch64_reloc_property* /* reloc_property */)
5311 AArch64_valtype x = psymval->value(object, addend) - address;
5312 // Pick bits [20:0] of X.
5313 AArch64_valtype immed = x & 0x1fffff;
5314 update_adr(view, immed);
5315 // Check -2^20 <= X < 2^20
5316 return (size == 64 && Bits<21>::has_overflow((x))
5317 ? This::STATUS_OVERFLOW
5318 : This::STATUS_OKAY);
5321 // Calculate PG(S+A) - PG(address), update adrp instruction.
5322 // R_AARCH64_ADR_PREL_PG_HI21
5324 static inline typename This::Status
5326 unsigned char* view,
5330 AArch64_valtype x = This::Page(sa) - This::Page(address);
5331 // Pick [32:12] of X.
5332 AArch64_valtype immed = (x >> 12) & 0x1fffff;
5333 update_adr(view, immed);
5334 // Check -2^32 <= X < 2^32
5335 return (size == 64 && Bits<33>::has_overflow((x))
5336 ? This::STATUS_OVERFLOW
5337 : This::STATUS_OKAY);
5340 // Calculate PG(S+A) - PG(address), update adrp instruction.
5341 // R_AARCH64_ADR_PREL_PG_HI21
5343 static inline typename This::Status
5344 adrp(unsigned char* view,
5345 const Sized_relobj_file<size, big_endian>* object,
5346 const Symbol_value<size>* psymval,
5349 const AArch64_reloc_property* reloc_property)
5351 Address sa = psymval->value(object, addend);
5352 AArch64_valtype x = This::Page(sa) - This::Page(address);
5353 // Pick [32:12] of X.
5354 AArch64_valtype immed = (x >> 12) & 0x1fffff;
5355 update_adr(view, immed);
5356 return (reloc_property->checkup_x_value(x)
5358 : This::STATUS_OVERFLOW);
5361 // Update mov[n/z] instruction. Check overflow if needed.
5362 // If X >=0, set the instruction to movz and its immediate value to the
5364 // If X < 0, set the instruction to movn and its immediate value to
5365 // NOT (selected bits of).
5367 static inline typename This::Status
5368 movnz(unsigned char* view,
5370 const AArch64_reloc_property* reloc_property)
5372 // Select bits from X.
5375 typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW;
5376 if (static_cast<SignedW>(x) >= 0)
5378 immed = reloc_property->select_x_value(x);
5383 immed = reloc_property->select_x_value(~x);;
5387 // Update movnz instruction.
5388 update_movnz(view, immed, is_movz);
5390 // Do check overflow or alignment if needed.
5391 return (reloc_property->checkup_x_value(x)
5393 : This::STATUS_OVERFLOW);
5397 maybe_apply_stub(unsigned int,
5398 const The_relocate_info*,
5402 const Sized_symbol<size>*,
5403 const Symbol_value<size>*,
5404 const Sized_relobj_file<size, big_endian>*,
5407 }; // End of AArch64_relocate_functions
5410 // For a certain relocation type (usually jump/branch), test to see if the
5411 // destination needs a stub to fulfil. If so, re-route the destination of the
5412 // original instruction to the stub, note, at this time, the stub has already
5415 template<int size, bool big_endian>
5417 AArch64_relocate_functions<size, big_endian>::
5418 maybe_apply_stub(unsigned int r_type,
5419 const The_relocate_info* relinfo,
5420 const The_rela& rela,
5421 unsigned char* view,
5423 const Sized_symbol<size>* gsym,
5424 const Symbol_value<size>* psymval,
5425 const Sized_relobj_file<size, big_endian>* object,
5426 section_size_type current_group_size)
5428 if (parameters->options().relocatable())
5431 typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend();
5432 Address branch_target = psymval->value(object, 0) + addend;
5434 The_reloc_stub::stub_type_for_reloc(r_type, address, branch_target);
5435 if (stub_type == ST_NONE)
5438 const The_aarch64_relobj* aarch64_relobj =
5439 static_cast<const The_aarch64_relobj*>(object);
5440 // We don't create stubs for undefined symbols so don't look for one.
5441 if (gsym && gsym->is_undefined())
5443 gold_debug(DEBUG_TARGET,
5444 "stub: looking for a stub for undefined symbol %s in file %s",
5445 gsym->name(), aarch64_relobj->name().c_str());
5449 The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx);
5450 gold_assert(stub_table != NULL);
5452 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5453 typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend);
5454 The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key);
5455 gold_assert(stub != NULL);
5457 Address new_branch_target = stub_table->address() + stub->offset();
5458 typename elfcpp::Swap<size, big_endian>::Valtype branch_offset =
5459 new_branch_target - address;
5460 const AArch64_reloc_property* arp =
5461 aarch64_reloc_property_table->get_reloc_property(r_type);
5462 gold_assert(arp != NULL);
5463 typename This::Status status = This::template
5464 rela_general<32>(view, branch_offset, 0, arp);
5465 if (status != This::STATUS_OKAY)
5466 gold_error(_("Stub is too far away, try a smaller value "
5467 "for '--stub-group-size'. The current value is 0x%lx."),
5468 static_cast<unsigned long>(current_group_size));
5473 // Group input sections for stub generation.
5475 // We group input sections in an output section so that the total size,
5476 // including any padding space due to alignment is smaller than GROUP_SIZE
5477 // unless the only input section in group is bigger than GROUP_SIZE already.
5478 // Then an ARM stub table is created to follow the last input section
5479 // in group. For each group an ARM stub table is created an is placed
5480 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5481 // extend the group after the stub table.
5483 template<int size, bool big_endian>
5485 Target_aarch64<size, big_endian>::group_sections(
5487 section_size_type group_size,
5488 bool stubs_always_after_branch,
5491 // Group input sections and insert stub table
5492 Layout::Section_list section_list;
5493 layout->get_executable_sections(§ion_list);
5494 for (Layout::Section_list::const_iterator p = section_list.begin();
5495 p != section_list.end();
5498 AArch64_output_section<size, big_endian>* output_section =
5499 static_cast<AArch64_output_section<size, big_endian>*>(*p);
5500 output_section->group_sections(group_size, stubs_always_after_branch,
5506 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5507 // section of RELOBJ.
5509 template<int size, bool big_endian>
5510 AArch64_input_section<size, big_endian>*
5511 Target_aarch64<size, big_endian>::find_aarch64_input_section(
5512 Relobj* relobj, unsigned int shndx) const
5514 Section_id sid(relobj, shndx);
5515 typename AArch64_input_section_map::const_iterator p =
5516 this->aarch64_input_section_map_.find(sid);
5517 return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL;
5521 // Make a new AArch64_input_section object.
5523 template<int size, bool big_endian>
5524 AArch64_input_section<size, big_endian>*
5525 Target_aarch64<size, big_endian>::new_aarch64_input_section(
5526 Relobj* relobj, unsigned int shndx)
5528 Section_id sid(relobj, shndx);
5530 AArch64_input_section<size, big_endian>* input_section =
5531 new AArch64_input_section<size, big_endian>(relobj, shndx);
5532 input_section->init();
5534 // Register new AArch64_input_section in map for look-up.
5535 std::pair<typename AArch64_input_section_map::iterator,bool> ins =
5536 this->aarch64_input_section_map_.insert(
5537 std::make_pair(sid, input_section));
5539 // Make sure that it we have not created another AArch64_input_section
5540 // for this input section already.
5541 gold_assert(ins.second);
5543 return input_section;
5547 // Relaxation hook. This is where we do stub generation.
5549 template<int size, bool big_endian>
5551 Target_aarch64<size, big_endian>::do_relax(
5553 const Input_objects* input_objects,
5554 Symbol_table* symtab,
5558 gold_assert(!parameters->options().relocatable());
5561 // We don't handle negative stub_group_size right now.
5562 this->stub_group_size_ = abs(parameters->options().stub_group_size());
5563 if (this->stub_group_size_ == 1)
5565 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5566 // will fail to link. The user will have to relink with an explicit
5567 // group size option.
5568 this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET -
5571 group_sections(layout, this->stub_group_size_, true, task);
5575 // If this is not the first pass, addresses and file offsets have
5576 // been reset at this point, set them here.
5577 for (Stub_table_iterator sp = this->stub_tables_.begin();
5578 sp != this->stub_tables_.end(); ++sp)
5580 The_stub_table* stt = *sp;
5581 The_aarch64_input_section* owner = stt->owner();
5582 off_t off = align_address(owner->original_size(),
5584 stt->set_address_and_file_offset(owner->address() + off,
5585 owner->offset() + off);
5589 // Scan relocs for relocation stubs
5590 for (Input_objects::Relobj_iterator op = input_objects->relobj_begin();
5591 op != input_objects->relobj_end();
5594 The_aarch64_relobj* aarch64_relobj =
5595 static_cast<The_aarch64_relobj*>(*op);
5596 // Lock the object so we can read from it. This is only called
5597 // single-threaded from Layout::finalize, so it is OK to lock.
5598 Task_lock_obj<Object> tl(task, aarch64_relobj);
5599 aarch64_relobj->scan_sections_for_stubs(this, symtab, layout);
5602 bool any_stub_table_changed = false;
5603 for (Stub_table_iterator siter = this->stub_tables_.begin();
5604 siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter)
5606 The_stub_table* stub_table = *siter;
5607 if (stub_table->update_data_size_changed_p())
5609 The_aarch64_input_section* owner = stub_table->owner();
5610 uint64_t address = owner->address();
5611 off_t offset = owner->offset();
5612 owner->reset_address_and_file_offset();
5613 owner->set_address_and_file_offset(address, offset);
5615 any_stub_table_changed = true;
5619 // Do not continue relaxation.
5620 bool continue_relaxation = any_stub_table_changed;
5621 if (!continue_relaxation)
5622 for (Stub_table_iterator sp = this->stub_tables_.begin();
5623 (sp != this->stub_tables_.end());
5625 (*sp)->finalize_stubs();
5627 return continue_relaxation;
5631 // Make a new Stub_table.
5633 template<int size, bool big_endian>
5634 Stub_table<size, big_endian>*
5635 Target_aarch64<size, big_endian>::new_stub_table(
5636 AArch64_input_section<size, big_endian>* owner)
5638 Stub_table<size, big_endian>* stub_table =
5639 new Stub_table<size, big_endian>(owner);
5640 stub_table->set_address(align_address(
5641 owner->address() + owner->data_size(), 8));
5642 stub_table->set_file_offset(owner->offset() + owner->data_size());
5643 stub_table->finalize_data_size();
5645 this->stub_tables_.push_back(stub_table);
5651 template<int size, bool big_endian>
5653 Target_aarch64<size, big_endian>::do_reloc_addend(
5654 void* arg, unsigned int r_type, uint64_t) const
5656 gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC);
5657 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
5658 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
5659 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
5660 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
5661 gold_assert(psymval->is_tls_symbol());
5662 // The value of a TLS symbol is the offset in the TLS segment.
5663 return psymval->value(ti.object, 0);
5666 // Return the number of entries in the PLT.
5668 template<int size, bool big_endian>
5670 Target_aarch64<size, big_endian>::plt_entry_count() const
5672 if (this->plt_ == NULL)
5674 return this->plt_->entry_count();
5677 // Return the offset of the first non-reserved PLT entry.
5679 template<int size, bool big_endian>
5681 Target_aarch64<size, big_endian>::first_plt_entry_offset() const
5683 return this->plt_->first_plt_entry_offset();
5686 // Return the size of each PLT entry.
5688 template<int size, bool big_endian>
5690 Target_aarch64<size, big_endian>::plt_entry_size() const
5692 return this->plt_->get_plt_entry_size();
5695 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5697 template<int size, bool big_endian>
5699 Target_aarch64<size, big_endian>::define_tls_base_symbol(
5700 Symbol_table* symtab, Layout* layout)
5702 if (this->tls_base_symbol_defined_)
5705 Output_segment* tls_segment = layout->tls_segment();
5706 if (tls_segment != NULL)
5708 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5709 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
5710 Symbol_table::PREDEFINED,
5714 elfcpp::STV_HIDDEN, 0,
5715 Symbol::SEGMENT_START,
5718 this->tls_base_symbol_defined_ = true;
5721 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5723 template<int size, bool big_endian>
5725 Target_aarch64<size, big_endian>::reserve_tlsdesc_entries(
5726 Symbol_table* symtab, Layout* layout)
5728 if (this->plt_ == NULL)
5729 this->make_plt_section(symtab, layout);
5731 if (!this->plt_->has_tlsdesc_entry())
5733 // Allocate the TLSDESC_GOT entry.
5734 Output_data_got_aarch64<size, big_endian>* got =
5735 this->got_section(symtab, layout);
5736 unsigned int got_offset = got->add_constant(0);
5738 // Allocate the TLSDESC_PLT entry.
5739 this->plt_->reserve_tlsdesc_entry(got_offset);
5743 // Create a GOT entry for the TLS module index.
5745 template<int size, bool big_endian>
5747 Target_aarch64<size, big_endian>::got_mod_index_entry(
5748 Symbol_table* symtab, Layout* layout,
5749 Sized_relobj_file<size, big_endian>* object)
5751 if (this->got_mod_index_offset_ == -1U)
5753 gold_assert(symtab != NULL && layout != NULL && object != NULL);
5754 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
5755 Output_data_got_aarch64<size, big_endian>* got =
5756 this->got_section(symtab, layout);
5757 unsigned int got_offset = got->add_constant(0);
5758 rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got,
5760 got->add_constant(0);
5761 this->got_mod_index_offset_ = got_offset;
5763 return this->got_mod_index_offset_;
5766 // Optimize the TLS relocation type based on what we know about the
5767 // symbol. IS_FINAL is true if the final address of this symbol is
5768 // known at link time.
5770 template<int size, bool big_endian>
5771 tls::Tls_optimization
5772 Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final,
5775 // If we are generating a shared library, then we can't do anything
5777 if (parameters->options().shared())
5778 return tls::TLSOPT_NONE;
5782 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
5783 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
5784 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19:
5785 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21:
5786 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
5787 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
5788 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
5789 case elfcpp::R_AARCH64_TLSDESC_OFF_G1:
5790 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC:
5791 case elfcpp::R_AARCH64_TLSDESC_LDR:
5792 case elfcpp::R_AARCH64_TLSDESC_ADD:
5793 case elfcpp::R_AARCH64_TLSDESC_CALL:
5794 // These are General-Dynamic which permits fully general TLS
5795 // access. Since we know that we are generating an executable,
5796 // we can convert this to Initial-Exec. If we also know that
5797 // this is a local symbol, we can further switch to Local-Exec.
5799 return tls::TLSOPT_TO_LE;
5800 return tls::TLSOPT_TO_IE;
5802 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
5803 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
5804 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
5805 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
5806 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
5807 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
5808 // These are Local-Dynamic, which refer to local symbols in the
5809 // dynamic TLS block. Since we know that we generating an
5810 // executable, we can switch to Local-Exec.
5811 return tls::TLSOPT_TO_LE;
5813 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1:
5814 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC:
5815 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
5816 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
5817 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19:
5818 // These are Initial-Exec relocs which get the thread offset
5819 // from the GOT. If we know that we are linking against the
5820 // local symbol, we can switch to Local-Exec, which links the
5821 // thread offset into the instruction.
5823 return tls::TLSOPT_TO_LE;
5824 return tls::TLSOPT_NONE;
5826 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
5827 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
5828 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
5829 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
5830 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
5831 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
5832 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
5833 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
5834 // When we already have Local-Exec, there is nothing further we
5836 return tls::TLSOPT_NONE;
5843 // Returns true if this relocation type could be that of a function pointer.
5845 template<int size, bool big_endian>
5847 Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc(
5848 unsigned int r_type)
5852 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
5853 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
5854 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
5855 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
5856 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
5864 // For safe ICF, scan a relocation for a local symbol to check if it
5865 // corresponds to a function pointer being taken. In that case mark
5866 // the function whose pointer was taken as not foldable.
5868 template<int size, bool big_endian>
5870 Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer(
5873 Target_aarch64<size, big_endian>* ,
5874 Sized_relobj_file<size, big_endian>* ,
5877 const elfcpp::Rela<size, big_endian>& ,
5878 unsigned int r_type,
5879 const elfcpp::Sym<size, big_endian>&)
5881 // When building a shared library, do not fold any local symbols.
5882 return (parameters->options().shared()
5883 || possible_function_pointer_reloc(r_type));
5886 // For safe ICF, scan a relocation for a global symbol to check if it
5887 // corresponds to a function pointer being taken. In that case mark
5888 // the function whose pointer was taken as not foldable.
5890 template<int size, bool big_endian>
5892 Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer(
5895 Target_aarch64<size, big_endian>* ,
5896 Sized_relobj_file<size, big_endian>* ,
5899 const elfcpp::Rela<size, big_endian>& ,
5900 unsigned int r_type,
5903 // When building a shared library, do not fold symbols whose visibility
5904 // is hidden, internal or protected.
5905 return ((parameters->options().shared()
5906 && (gsym->visibility() == elfcpp::STV_INTERNAL
5907 || gsym->visibility() == elfcpp::STV_PROTECTED
5908 || gsym->visibility() == elfcpp::STV_HIDDEN))
5909 || possible_function_pointer_reloc(r_type));
5912 // Report an unsupported relocation against a local symbol.
5914 template<int size, bool big_endian>
5916 Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local(
5917 Sized_relobj_file<size, big_endian>* object,
5918 unsigned int r_type)
5920 gold_error(_("%s: unsupported reloc %u against local symbol"),
5921 object->name().c_str(), r_type);
5924 // We are about to emit a dynamic relocation of type R_TYPE. If the
5925 // dynamic linker does not support it, issue an error.
5927 template<int size, bool big_endian>
5929 Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object,
5930 unsigned int r_type)
5932 gold_assert(r_type != elfcpp::R_AARCH64_NONE);
5936 // These are the relocation types supported by glibc for AARCH64.
5937 case elfcpp::R_AARCH64_NONE:
5938 case elfcpp::R_AARCH64_COPY:
5939 case elfcpp::R_AARCH64_GLOB_DAT:
5940 case elfcpp::R_AARCH64_JUMP_SLOT:
5941 case elfcpp::R_AARCH64_RELATIVE:
5942 case elfcpp::R_AARCH64_TLS_DTPREL64:
5943 case elfcpp::R_AARCH64_TLS_DTPMOD64:
5944 case elfcpp::R_AARCH64_TLS_TPREL64:
5945 case elfcpp::R_AARCH64_TLSDESC:
5946 case elfcpp::R_AARCH64_IRELATIVE:
5947 case elfcpp::R_AARCH64_ABS32:
5948 case elfcpp::R_AARCH64_ABS64:
5955 // This prevents us from issuing more than one error per reloc
5956 // section. But we can still wind up issuing more than one
5957 // error per object file.
5958 if (this->issued_non_pic_error_)
5960 gold_assert(parameters->options().output_is_position_independent());
5961 object->error(_("requires unsupported dynamic reloc; "
5962 "recompile with -fPIC"));
5963 this->issued_non_pic_error_ = true;
5967 // Return whether we need to make a PLT entry for a relocation of the
5968 // given type against a STT_GNU_IFUNC symbol.
5970 template<int size, bool big_endian>
5972 Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc(
5973 Sized_relobj_file<size, big_endian>* object,
5974 unsigned int r_type)
5976 const AArch64_reloc_property* arp =
5977 aarch64_reloc_property_table->get_reloc_property(r_type);
5978 gold_assert(arp != NULL);
5980 int flags = arp->reference_flags();
5981 if (flags & Symbol::TLS_REF)
5983 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5984 object->name().c_str(), arp->name().c_str());
5990 // Scan a relocation for a local symbol.
5992 template<int size, bool big_endian>
5994 Target_aarch64<size, big_endian>::Scan::local(
5995 Symbol_table* symtab,
5997 Target_aarch64<size, big_endian>* target,
5998 Sized_relobj_file<size, big_endian>* object,
5999 unsigned int data_shndx,
6000 Output_section* output_section,
6001 const elfcpp::Rela<size, big_endian>& rela,
6002 unsigned int r_type,
6003 const elfcpp::Sym<size, big_endian>& lsym,
6009 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
6011 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6013 // A local STT_GNU_IFUNC symbol may require a PLT entry.
6014 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
6015 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
6016 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
6020 case elfcpp::R_AARCH64_NONE:
6023 case elfcpp::R_AARCH64_ABS32:
6024 case elfcpp::R_AARCH64_ABS16:
6025 if (parameters->options().output_is_position_independent())
6027 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6028 object->name().c_str(), r_type);
6032 case elfcpp::R_AARCH64_ABS64:
6033 // If building a shared library or pie, we need to mark this as a dynmic
6034 // reloction, so that the dynamic loader can relocate it.
6035 if (parameters->options().output_is_position_independent())
6037 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6038 rela_dyn->add_local_relative(object, r_sym,
6039 elfcpp::R_AARCH64_RELATIVE,
6042 rela.get_r_offset(),
6043 rela.get_r_addend(),
6048 case elfcpp::R_AARCH64_PREL64:
6049 case elfcpp::R_AARCH64_PREL32:
6050 case elfcpp::R_AARCH64_PREL16:
6053 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6054 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6055 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
6056 // The above relocations are used to access GOT entries.
6058 Output_data_got_aarch64<size, big_endian>* got =
6059 target->got_section(symtab, layout);
6060 bool is_new = false;
6061 // This symbol requires a GOT entry.
6063 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
6065 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
6066 if (is_new && parameters->options().output_is_position_independent())
6067 target->rela_dyn_section(layout)->
6068 add_local_relative(object,
6070 elfcpp::R_AARCH64_RELATIVE,
6072 object->local_got_offset(r_sym,
6079 case elfcpp::R_AARCH64_MOVW_UABS_G0: // 263
6080 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC: // 264
6081 case elfcpp::R_AARCH64_MOVW_UABS_G1: // 265
6082 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC: // 266
6083 case elfcpp::R_AARCH64_MOVW_UABS_G2: // 267
6084 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC: // 268
6085 case elfcpp::R_AARCH64_MOVW_UABS_G3: // 269
6086 case elfcpp::R_AARCH64_MOVW_SABS_G0: // 270
6087 case elfcpp::R_AARCH64_MOVW_SABS_G1: // 271
6088 case elfcpp::R_AARCH64_MOVW_SABS_G2: // 272
6089 if (parameters->options().output_is_position_independent())
6091 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6092 object->name().c_str(), r_type);
6096 case elfcpp::R_AARCH64_LD_PREL_LO19: // 273
6097 case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274
6098 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275
6099 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
6100 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277
6101 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278
6102 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284
6103 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285
6104 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286
6105 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
6108 // Control flow, pc-relative. We don't need to do anything for a relative
6109 // addressing relocation against a local symbol if it does not reference
6111 case elfcpp::R_AARCH64_TSTBR14:
6112 case elfcpp::R_AARCH64_CONDBR19:
6113 case elfcpp::R_AARCH64_JUMP26:
6114 case elfcpp::R_AARCH64_CALL26:
6117 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
6118 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
6120 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6121 optimize_tls_reloc(!parameters->options().shared(), r_type);
6122 if (tlsopt == tls::TLSOPT_TO_LE)
6125 layout->set_has_static_tls();
6126 // Create a GOT entry for the tp-relative offset.
6127 if (!parameters->doing_static_link())
6129 Output_data_got_aarch64<size, big_endian>* got =
6130 target->got_section(symtab, layout);
6131 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
6132 target->rela_dyn_section(layout),
6133 elfcpp::R_AARCH64_TLS_TPREL64);
6135 else if (!object->local_has_got_offset(r_sym,
6136 GOT_TYPE_TLS_OFFSET))
6138 Output_data_got_aarch64<size, big_endian>* got =
6139 target->got_section(symtab, layout);
6140 got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET);
6141 unsigned int got_offset =
6142 object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET);
6143 const elfcpp::Elf_Xword addend = rela.get_r_addend();
6144 gold_assert(addend == 0);
6145 got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64,
6151 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
6152 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
6154 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6155 optimize_tls_reloc(!parameters->options().shared(), r_type);
6156 if (tlsopt == tls::TLSOPT_TO_LE)
6158 layout->set_has_static_tls();
6161 gold_assert(tlsopt == tls::TLSOPT_NONE);
6163 Output_data_got_aarch64<size, big_endian>* got =
6164 target->got_section(symtab, layout);
6165 got->add_local_pair_with_rel(object,r_sym, data_shndx,
6167 target->rela_dyn_section(layout),
6168 elfcpp::R_AARCH64_TLS_DTPMOD64);
6172 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
6173 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
6174 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
6175 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
6176 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
6177 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
6178 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
6179 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
6181 layout->set_has_static_tls();
6182 bool output_is_shared = parameters->options().shared();
6183 if (output_is_shared)
6184 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6185 object->name().c_str(), r_type);
6189 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
6190 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
6192 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6193 optimize_tls_reloc(!parameters->options().shared(), r_type);
6194 if (tlsopt == tls::TLSOPT_NONE)
6196 // Create a GOT entry for the module index.
6197 target->got_mod_index_entry(symtab, layout, object);
6199 else if (tlsopt != tls::TLSOPT_TO_LE)
6200 unsupported_reloc_local(object, r_type);
6204 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
6205 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
6206 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
6207 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
6210 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
6211 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
6212 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
6214 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6215 optimize_tls_reloc(!parameters->options().shared(), r_type);
6216 target->define_tls_base_symbol(symtab, layout);
6217 if (tlsopt == tls::TLSOPT_NONE)
6219 // Create reserved PLT and GOT entries for the resolver.
6220 target->reserve_tlsdesc_entries(symtab, layout);
6222 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6223 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6224 // entry needs to be in an area in .got.plt, not .got. Call
6225 // got_section to make sure the section has been created.
6226 target->got_section(symtab, layout);
6227 Output_data_got<size, big_endian>* got =
6228 target->got_tlsdesc_section();
6229 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6230 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
6232 unsigned int got_offset = got->add_constant(0);
6233 got->add_constant(0);
6234 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
6236 Reloc_section* rt = target->rela_tlsdesc_section(layout);
6237 // We store the arguments we need in a vector, and use
6238 // the index into the vector as the parameter to pass
6239 // to the target specific routines.
6240 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
6241 void* arg = reinterpret_cast<void*>(intarg);
6242 rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg,
6243 got, got_offset, 0);
6246 else if (tlsopt != tls::TLSOPT_TO_LE)
6247 unsupported_reloc_local(object, r_type);
6251 case elfcpp::R_AARCH64_TLSDESC_CALL:
6255 unsupported_reloc_local(object, r_type);
6260 // Report an unsupported relocation against a global symbol.
6262 template<int size, bool big_endian>
6264 Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global(
6265 Sized_relobj_file<size, big_endian>* object,
6266 unsigned int r_type,
6269 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6270 object->name().c_str(), r_type, gsym->demangled_name().c_str());
6273 template<int size, bool big_endian>
6275 Target_aarch64<size, big_endian>::Scan::global(
6276 Symbol_table* symtab,
6278 Target_aarch64<size, big_endian>* target,
6279 Sized_relobj_file<size, big_endian> * object,
6280 unsigned int data_shndx,
6281 Output_section* output_section,
6282 const elfcpp::Rela<size, big_endian>& rela,
6283 unsigned int r_type,
6286 // A STT_GNU_IFUNC symbol may require a PLT entry.
6287 if (gsym->type() == elfcpp::STT_GNU_IFUNC
6288 && this->reloc_needs_plt_for_ifunc(object, r_type))
6289 target->make_plt_entry(symtab, layout, gsym);
6291 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>
6293 const AArch64_reloc_property* arp =
6294 aarch64_reloc_property_table->get_reloc_property(r_type);
6295 gold_assert(arp != NULL);
6299 case elfcpp::R_AARCH64_NONE:
6302 case elfcpp::R_AARCH64_ABS16:
6303 case elfcpp::R_AARCH64_ABS32:
6304 case elfcpp::R_AARCH64_ABS64:
6306 // Make a PLT entry if necessary.
6307 if (gsym->needs_plt_entry())
6309 target->make_plt_entry(symtab, layout, gsym);
6310 // Since this is not a PC-relative relocation, we may be
6311 // taking the address of a function. In that case we need to
6312 // set the entry in the dynamic symbol table to the address of
6314 if (gsym->is_from_dynobj() && !parameters->options().shared())
6315 gsym->set_needs_dynsym_value();
6317 // Make a dynamic relocation if necessary.
6318 if (gsym->needs_dynamic_reloc(arp->reference_flags()))
6320 if (!parameters->options().output_is_position_independent()
6321 && gsym->may_need_copy_reloc())
6323 target->copy_reloc(symtab, layout, object,
6324 data_shndx, output_section, gsym, rela);
6326 else if (r_type == elfcpp::R_AARCH64_ABS64
6327 && gsym->type() == elfcpp::STT_GNU_IFUNC
6328 && gsym->can_use_relative_reloc(false)
6329 && !gsym->is_from_dynobj()
6330 && !gsym->is_undefined()
6331 && !gsym->is_preemptible())
6333 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6334 // symbol. This makes a function address in a PIE executable
6335 // match the address in a shared library that it links against.
6336 Reloc_section* rela_dyn =
6337 target->rela_irelative_section(layout);
6338 unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE;
6339 rela_dyn->add_symbolless_global_addend(gsym, r_type,
6340 output_section, object,
6342 rela.get_r_offset(),
6343 rela.get_r_addend());
6345 else if (r_type == elfcpp::R_AARCH64_ABS64
6346 && gsym->can_use_relative_reloc(false))
6348 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6349 rela_dyn->add_global_relative(gsym,
6350 elfcpp::R_AARCH64_RELATIVE,
6354 rela.get_r_offset(),
6355 rela.get_r_addend(),
6360 check_non_pic(object, r_type);
6361 Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*
6362 rela_dyn = target->rela_dyn_section(layout);
6363 rela_dyn->add_global(
6364 gsym, r_type, output_section, object,
6365 data_shndx, rela.get_r_offset(),rela.get_r_addend());
6371 case elfcpp::R_AARCH64_PREL16:
6372 case elfcpp::R_AARCH64_PREL32:
6373 case elfcpp::R_AARCH64_PREL64:
6374 // This is used to fill the GOT absolute address.
6375 if (gsym->needs_plt_entry())
6377 target->make_plt_entry(symtab, layout, gsym);
6381 case elfcpp::R_AARCH64_MOVW_UABS_G0: // 263
6382 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC: // 264
6383 case elfcpp::R_AARCH64_MOVW_UABS_G1: // 265
6384 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC: // 266
6385 case elfcpp::R_AARCH64_MOVW_UABS_G2: // 267
6386 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC: // 268
6387 case elfcpp::R_AARCH64_MOVW_UABS_G3: // 269
6388 case elfcpp::R_AARCH64_MOVW_SABS_G0: // 270
6389 case elfcpp::R_AARCH64_MOVW_SABS_G1: // 271
6390 case elfcpp::R_AARCH64_MOVW_SABS_G2: // 272
6391 if (parameters->options().output_is_position_independent())
6393 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6394 object->name().c_str(), r_type);
6398 case elfcpp::R_AARCH64_LD_PREL_LO19: // 273
6399 case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274
6400 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275
6401 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276
6402 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277
6403 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278
6404 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284
6405 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285
6406 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286
6407 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299
6409 if (gsym->needs_plt_entry())
6410 target->make_plt_entry(symtab, layout, gsym);
6411 // Make a dynamic relocation if necessary.
6412 if (gsym->needs_dynamic_reloc(arp->reference_flags()))
6414 if (parameters->options().output_is_executable()
6415 && gsym->may_need_copy_reloc())
6417 target->copy_reloc(symtab, layout, object,
6418 data_shndx, output_section, gsym, rela);
6424 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6425 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6426 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
6428 // The above relocations are used to access GOT entries.
6429 // Note a GOT entry is an *address* to a symbol.
6430 // The symbol requires a GOT entry
6431 Output_data_got_aarch64<size, big_endian>* got =
6432 target->got_section(symtab, layout);
6433 if (gsym->final_value_is_known())
6435 // For a STT_GNU_IFUNC symbol we want the PLT address.
6436 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
6437 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
6439 got->add_global(gsym, GOT_TYPE_STANDARD);
6443 // If this symbol is not fully resolved, we need to add a dynamic
6444 // relocation for it.
6445 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
6447 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6449 // 1) The symbol may be defined in some other module.
6450 // 2) We are building a shared library and this is a protected
6451 // symbol; using GLOB_DAT means that the dynamic linker can use
6452 // the address of the PLT in the main executable when appropriate
6453 // so that function address comparisons work.
6454 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6455 // again so that function address comparisons work.
6456 if (gsym->is_from_dynobj()
6457 || gsym->is_undefined()
6458 || gsym->is_preemptible()
6459 || (gsym->visibility() == elfcpp::STV_PROTECTED
6460 && parameters->options().shared())
6461 || (gsym->type() == elfcpp::STT_GNU_IFUNC
6462 && parameters->options().output_is_position_independent()))
6463 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
6464 rela_dyn, elfcpp::R_AARCH64_GLOB_DAT);
6467 // For a STT_GNU_IFUNC symbol we want to write the PLT
6468 // offset into the GOT, so that function pointer
6469 // comparisons work correctly.
6471 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
6472 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
6475 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
6476 // Tell the dynamic linker to use the PLT address
6477 // when resolving relocations.
6478 if (gsym->is_from_dynobj()
6479 && !parameters->options().shared())
6480 gsym->set_needs_dynsym_value();
6484 rela_dyn->add_global_relative(
6485 gsym, elfcpp::R_AARCH64_RELATIVE,
6487 gsym->got_offset(GOT_TYPE_STANDARD),
6496 case elfcpp::R_AARCH64_TSTBR14:
6497 case elfcpp::R_AARCH64_CONDBR19:
6498 case elfcpp::R_AARCH64_JUMP26:
6499 case elfcpp::R_AARCH64_CALL26:
6501 if (gsym->final_value_is_known())
6504 if (gsym->is_defined() &&
6505 !gsym->is_from_dynobj() &&
6506 !gsym->is_preemptible())
6509 // Make plt entry for function call.
6510 target->make_plt_entry(symtab, layout, gsym);
6514 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
6515 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic
6517 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6518 optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6519 if (tlsopt == tls::TLSOPT_TO_LE)
6521 layout->set_has_static_tls();
6524 gold_assert(tlsopt == tls::TLSOPT_NONE);
6527 Output_data_got_aarch64<size, big_endian>* got =
6528 target->got_section(symtab, layout);
6529 // Create 2 consecutive entries for module index and offset.
6530 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
6531 target->rela_dyn_section(layout),
6532 elfcpp::R_AARCH64_TLS_DTPMOD64,
6533 elfcpp::R_AARCH64_TLS_DTPREL64);
6537 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
6538 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic
6540 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6541 optimize_tls_reloc(!parameters->options().shared(), r_type);
6542 if (tlsopt == tls::TLSOPT_NONE)
6544 // Create a GOT entry for the module index.
6545 target->got_mod_index_entry(symtab, layout, object);
6547 else if (tlsopt != tls::TLSOPT_TO_LE)
6548 unsupported_reloc_local(object, r_type);
6552 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
6553 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
6554 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
6555 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic
6558 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
6559 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable
6561 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6562 optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6563 if (tlsopt == tls::TLSOPT_TO_LE)
6566 layout->set_has_static_tls();
6567 // Create a GOT entry for the tp-relative offset.
6568 Output_data_got_aarch64<size, big_endian>* got
6569 = target->got_section(symtab, layout);
6570 if (!parameters->doing_static_link())
6572 got->add_global_with_rel(
6573 gsym, GOT_TYPE_TLS_OFFSET,
6574 target->rela_dyn_section(layout),
6575 elfcpp::R_AARCH64_TLS_TPREL64);
6577 if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET))
6579 got->add_global(gsym, GOT_TYPE_TLS_OFFSET);
6580 unsigned int got_offset =
6581 gsym->got_offset(GOT_TYPE_TLS_OFFSET);
6582 const elfcpp::Elf_Xword addend = rela.get_r_addend();
6583 gold_assert(addend == 0);
6584 got->add_static_reloc(got_offset,
6585 elfcpp::R_AARCH64_TLS_TPREL64, gsym);
6590 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
6591 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
6592 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
6593 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
6594 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
6595 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
6596 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
6597 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable
6598 layout->set_has_static_tls();
6599 if (parameters->options().shared())
6600 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6601 object->name().c_str(), r_type);
6604 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
6605 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
6606 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor
6608 target->define_tls_base_symbol(symtab, layout);
6609 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
6610 optimize_tls_reloc(gsym->final_value_is_known(), r_type);
6611 if (tlsopt == tls::TLSOPT_NONE)
6613 // Create reserved PLT and GOT entries for the resolver.
6614 target->reserve_tlsdesc_entries(symtab, layout);
6616 // Create a double GOT entry with an R_AARCH64_TLSDESC
6617 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6618 // entry needs to be in an area in .got.plt, not .got. Call
6619 // got_section to make sure the section has been created.
6620 target->got_section(symtab, layout);
6621 Output_data_got<size, big_endian>* got =
6622 target->got_tlsdesc_section();
6623 Reloc_section* rt = target->rela_tlsdesc_section(layout);
6624 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
6625 elfcpp::R_AARCH64_TLSDESC, 0);
6627 else if (tlsopt == tls::TLSOPT_TO_IE)
6629 // Create a GOT entry for the tp-relative offset.
6630 Output_data_got<size, big_endian>* got
6631 = target->got_section(symtab, layout);
6632 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
6633 target->rela_dyn_section(layout),
6634 elfcpp::R_AARCH64_TLS_TPREL64);
6636 else if (tlsopt != tls::TLSOPT_TO_LE)
6637 unsupported_reloc_global(object, r_type, gsym);
6641 case elfcpp::R_AARCH64_TLSDESC_CALL:
6645 gold_error(_("%s: unsupported reloc type in global scan"),
6646 aarch64_reloc_property_table->
6647 reloc_name_in_error_message(r_type).c_str());
6650 } // End of Scan::global
6653 // Create the PLT section.
6654 template<int size, bool big_endian>
6656 Target_aarch64<size, big_endian>::make_plt_section(
6657 Symbol_table* symtab, Layout* layout)
6659 if (this->plt_ == NULL)
6661 // Create the GOT section first.
6662 this->got_section(symtab, layout);
6664 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
6665 this->got_irelative_);
6667 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
6669 | elfcpp::SHF_EXECINSTR),
6670 this->plt_, ORDER_PLT, false);
6672 // Make the sh_info field of .rela.plt point to .plt.
6673 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
6674 rela_plt_os->set_info_section(this->plt_->output_section());
6678 // Return the section for TLSDESC relocations.
6680 template<int size, bool big_endian>
6681 typename Target_aarch64<size, big_endian>::Reloc_section*
6682 Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const
6684 return this->plt_section()->rela_tlsdesc(layout);
6687 // Create a PLT entry for a global symbol.
6689 template<int size, bool big_endian>
6691 Target_aarch64<size, big_endian>::make_plt_entry(
6692 Symbol_table* symtab,
6696 if (gsym->has_plt_offset())
6699 if (this->plt_ == NULL)
6700 this->make_plt_section(symtab, layout);
6702 this->plt_->add_entry(symtab, layout, gsym);
6705 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6707 template<int size, bool big_endian>
6709 Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry(
6710 Symbol_table* symtab, Layout* layout,
6711 Sized_relobj_file<size, big_endian>* relobj,
6712 unsigned int local_sym_index)
6714 if (relobj->local_has_plt_offset(local_sym_index))
6716 if (this->plt_ == NULL)
6717 this->make_plt_section(symtab, layout);
6718 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
6721 relobj->set_local_plt_offset(local_sym_index, plt_offset);
6724 template<int size, bool big_endian>
6726 Target_aarch64<size, big_endian>::gc_process_relocs(
6727 Symbol_table* symtab,
6729 Sized_relobj_file<size, big_endian>* object,
6730 unsigned int data_shndx,
6731 unsigned int sh_type,
6732 const unsigned char* prelocs,
6734 Output_section* output_section,
6735 bool needs_special_offset_handling,
6736 size_t local_symbol_count,
6737 const unsigned char* plocal_symbols)
6739 typedef Target_aarch64<size, big_endian> Aarch64;
6740 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
6743 if (sh_type == elfcpp::SHT_REL)
6748 gold::gc_process_relocs<size, big_endian, Aarch64, Scan, Classify_reloc>(
6757 needs_special_offset_handling,
6762 // Scan relocations for a section.
6764 template<int size, bool big_endian>
6766 Target_aarch64<size, big_endian>::scan_relocs(
6767 Symbol_table* symtab,
6769 Sized_relobj_file<size, big_endian>* object,
6770 unsigned int data_shndx,
6771 unsigned int sh_type,
6772 const unsigned char* prelocs,
6774 Output_section* output_section,
6775 bool needs_special_offset_handling,
6776 size_t local_symbol_count,
6777 const unsigned char* plocal_symbols)
6779 typedef Target_aarch64<size, big_endian> Aarch64;
6780 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
6783 if (sh_type == elfcpp::SHT_REL)
6785 gold_error(_("%s: unsupported REL reloc section"),
6786 object->name().c_str());
6790 gold::scan_relocs<size, big_endian, Aarch64, Scan, Classify_reloc>(
6799 needs_special_offset_handling,
6804 // Return the value to use for a dynamic which requires special
6805 // treatment. This is how we support equality comparisons of function
6806 // pointers across shared library boundaries, as described in the
6807 // processor specific ABI supplement.
6809 template<int size, bool big_endian>
6811 Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const
6813 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
6814 return this->plt_address_for_global(gsym);
6818 // Finalize the sections.
6820 template<int size, bool big_endian>
6822 Target_aarch64<size, big_endian>::do_finalize_sections(
6824 const Input_objects*,
6825 Symbol_table* symtab)
6827 const Reloc_section* rel_plt = (this->plt_ == NULL
6829 : this->plt_->rela_plt());
6830 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
6831 this->rela_dyn_, true, false);
6833 // Emit any relocs we saved in an attempt to avoid generating COPY
6835 if (this->copy_relocs_.any_saved_relocs())
6836 this->copy_relocs_.emit(this->rela_dyn_section(layout));
6838 // Fill in some more dynamic tags.
6839 Output_data_dynamic* const odyn = layout->dynamic_data();
6842 if (this->plt_ != NULL
6843 && this->plt_->output_section() != NULL
6844 && this->plt_ ->has_tlsdesc_entry())
6846 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
6847 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
6848 this->got_->finalize_data_size();
6849 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
6850 this->plt_, plt_offset);
6851 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
6852 this->got_, got_offset);
6856 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6857 // the .got.plt section.
6858 Symbol* sym = this->global_offset_table_;
6861 uint64_t data_size = this->got_plt_->current_data_size();
6862 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
6864 // If the .got section is more than 0x8000 bytes, we add
6865 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6866 // bit relocations have a greater chance of working.
6867 if (data_size >= 0x8000)
6868 symtab->get_sized_symbol<size>(sym)->set_value(
6869 symtab->get_sized_symbol<size>(sym)->value() + 0x8000);
6872 if (parameters->doing_static_link()
6873 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
6875 // If linking statically, make sure that the __rela_iplt symbols
6876 // were defined if necessary, even if we didn't create a PLT.
6877 static const Define_symbol_in_segment syms[] =
6880 "__rela_iplt_start", // name
6881 elfcpp::PT_LOAD, // segment_type
6882 elfcpp::PF_W, // segment_flags_set
6883 elfcpp::PF(0), // segment_flags_clear
6886 elfcpp::STT_NOTYPE, // type
6887 elfcpp::STB_GLOBAL, // binding
6888 elfcpp::STV_HIDDEN, // visibility
6890 Symbol::SEGMENT_START, // offset_from_base
6894 "__rela_iplt_end", // name
6895 elfcpp::PT_LOAD, // segment_type
6896 elfcpp::PF_W, // segment_flags_set
6897 elfcpp::PF(0), // segment_flags_clear
6900 elfcpp::STT_NOTYPE, // type
6901 elfcpp::STB_GLOBAL, // binding
6902 elfcpp::STV_HIDDEN, // visibility
6904 Symbol::SEGMENT_START, // offset_from_base
6909 symtab->define_symbols(layout, 2, syms,
6910 layout->script_options()->saw_sections_clause());
6916 // Perform a relocation.
6918 template<int size, bool big_endian>
6920 Target_aarch64<size, big_endian>::Relocate::relocate(
6921 const Relocate_info<size, big_endian>* relinfo,
6923 Target_aarch64<size, big_endian>* target,
6926 const unsigned char* preloc,
6927 const Sized_symbol<size>* gsym,
6928 const Symbol_value<size>* psymval,
6929 unsigned char* view,
6930 typename elfcpp::Elf_types<size>::Elf_Addr address,
6931 section_size_type /* view_size */)
6936 typedef AArch64_relocate_functions<size, big_endian> Reloc;
6938 const elfcpp::Rela<size, big_endian> rela(preloc);
6939 unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
6940 const AArch64_reloc_property* reloc_property =
6941 aarch64_reloc_property_table->get_reloc_property(r_type);
6943 if (reloc_property == NULL)
6945 std::string reloc_name =
6946 aarch64_reloc_property_table->reloc_name_in_error_message(r_type);
6947 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
6948 _("cannot relocate %s in object file"),
6949 reloc_name.c_str());
6953 const Sized_relobj_file<size, big_endian>* object = relinfo->object;
6955 // Pick the value to use for symbols defined in the PLT.
6956 Symbol_value<size> symval;
6958 && gsym->use_plt_offset(reloc_property->reference_flags()))
6960 symval.set_output_value(target->plt_address_for_global(gsym));
6963 else if (gsym == NULL && psymval->is_ifunc_symbol())
6965 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
6966 if (object->local_has_plt_offset(r_sym))
6968 symval.set_output_value(target->plt_address_for_local(object, r_sym));
6973 const elfcpp::Elf_Xword addend = rela.get_r_addend();
6975 // Get the GOT offset if needed.
6976 // For aarch64, the GOT pointer points to the start of the GOT section.
6977 bool have_got_offset = false;
6979 int got_base = (target->got_ != NULL
6980 ? (target->got_->current_data_size() >= 0x8000
6985 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0:
6986 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC:
6987 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1:
6988 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC:
6989 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2:
6990 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC:
6991 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3:
6992 case elfcpp::R_AARCH64_GOTREL64:
6993 case elfcpp::R_AARCH64_GOTREL32:
6994 case elfcpp::R_AARCH64_GOT_LD_PREL19:
6995 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15:
6996 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
6997 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
6998 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
7001 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
7002 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base;
7006 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7007 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
7008 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
7011 have_got_offset = true;
7018 typename Reloc::Status reloc_status = Reloc::STATUS_OKAY;
7019 typename elfcpp::Elf_types<size>::Elf_Addr value;
7022 case elfcpp::R_AARCH64_NONE:
7025 case elfcpp::R_AARCH64_ABS64:
7026 if (!parameters->options().apply_dynamic_relocs()
7027 && parameters->options().output_is_position_independent()
7029 && gsym->needs_dynamic_reloc(reloc_property->reference_flags())
7030 && !gsym->can_use_relative_reloc(false))
7031 // We have generated an absolute dynamic relocation, so do not
7032 // apply the relocation statically. (Works around bugs in older
7033 // Android dynamic linkers.)
7035 reloc_status = Reloc::template rela_ua<64>(
7036 view, object, psymval, addend, reloc_property);
7039 case elfcpp::R_AARCH64_ABS32:
7040 if (!parameters->options().apply_dynamic_relocs()
7041 && parameters->options().output_is_position_independent()
7043 && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
7044 // We have generated an absolute dynamic relocation, so do not
7045 // apply the relocation statically. (Works around bugs in older
7046 // Android dynamic linkers.)
7048 reloc_status = Reloc::template rela_ua<32>(
7049 view, object, psymval, addend, reloc_property);
7052 case elfcpp::R_AARCH64_ABS16:
7053 if (!parameters->options().apply_dynamic_relocs()
7054 && parameters->options().output_is_position_independent()
7056 && gsym->needs_dynamic_reloc(reloc_property->reference_flags()))
7057 // We have generated an absolute dynamic relocation, so do not
7058 // apply the relocation statically. (Works around bugs in older
7059 // Android dynamic linkers.)
7061 reloc_status = Reloc::template rela_ua<16>(
7062 view, object, psymval, addend, reloc_property);
7065 case elfcpp::R_AARCH64_PREL64:
7066 reloc_status = Reloc::template pcrela_ua<64>(
7067 view, object, psymval, addend, address, reloc_property);
7070 case elfcpp::R_AARCH64_PREL32:
7071 reloc_status = Reloc::template pcrela_ua<32>(
7072 view, object, psymval, addend, address, reloc_property);
7075 case elfcpp::R_AARCH64_PREL16:
7076 reloc_status = Reloc::template pcrela_ua<16>(
7077 view, object, psymval, addend, address, reloc_property);
7080 case elfcpp::R_AARCH64_MOVW_UABS_G0:
7081 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC:
7082 case elfcpp::R_AARCH64_MOVW_UABS_G1:
7083 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC:
7084 case elfcpp::R_AARCH64_MOVW_UABS_G2:
7085 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC:
7086 case elfcpp::R_AARCH64_MOVW_UABS_G3:
7087 reloc_status = Reloc::template rela_general<32>(
7088 view, object, psymval, addend, reloc_property);
7090 case elfcpp::R_AARCH64_MOVW_SABS_G0:
7091 case elfcpp::R_AARCH64_MOVW_SABS_G1:
7092 case elfcpp::R_AARCH64_MOVW_SABS_G2:
7093 reloc_status = Reloc::movnz(view, psymval->value(object, addend),
7097 case elfcpp::R_AARCH64_LD_PREL_LO19:
7098 reloc_status = Reloc::template pcrela_general<32>(
7099 view, object, psymval, addend, address, reloc_property);
7102 case elfcpp::R_AARCH64_ADR_PREL_LO21:
7103 reloc_status = Reloc::adr(view, object, psymval, addend,
7104 address, reloc_property);
7107 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC:
7108 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21:
7109 reloc_status = Reloc::adrp(view, object, psymval, addend, address,
7113 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC:
7114 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC:
7115 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC:
7116 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC:
7117 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC:
7118 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC:
7119 reloc_status = Reloc::template rela_general<32>(
7120 view, object, psymval, addend, reloc_property);
7123 case elfcpp::R_AARCH64_CALL26:
7124 if (this->skip_call_tls_get_addr_)
7126 // Double check that the TLSGD insn has been optimized away.
7127 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7128 Insntype insn = elfcpp::Swap<32, big_endian>::readval(
7129 reinterpret_cast<Insntype*>(view));
7130 gold_assert((insn & 0xff000000) == 0x91000000);
7132 reloc_status = Reloc::STATUS_OKAY;
7133 this->skip_call_tls_get_addr_ = false;
7134 // Return false to stop further processing this reloc.
7138 case elfcpp::R_AARCH64_JUMP26:
7139 if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address,
7140 gsym, psymval, object,
7141 target->stub_group_size_))
7144 case elfcpp::R_AARCH64_TSTBR14:
7145 case elfcpp::R_AARCH64_CONDBR19:
7146 reloc_status = Reloc::template pcrela_general<32>(
7147 view, object, psymval, addend, address, reloc_property);
7150 case elfcpp::R_AARCH64_ADR_GOT_PAGE:
7151 gold_assert(have_got_offset);
7152 value = target->got_->address() + got_base + got_offset;
7153 reloc_status = Reloc::adrp(view, value + addend, address);
7156 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC:
7157 gold_assert(have_got_offset);
7158 value = target->got_->address() + got_base + got_offset;
7159 reloc_status = Reloc::template rela_general<32>(
7160 view, value, addend, reloc_property);
7163 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15:
7165 gold_assert(have_got_offset);
7166 value = target->got_->address() + got_base + got_offset + addend -
7167 Reloc::Page(target->got_->address() + got_base);
7168 if ((value & 7) != 0)
7169 reloc_status = Reloc::STATUS_OVERFLOW;
7171 reloc_status = Reloc::template reloc_common<32>(
7172 view, value, reloc_property);
7176 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7177 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
7178 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7179 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
7180 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7181 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7182 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7183 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
7184 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7185 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
7186 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7187 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7188 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
7189 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7190 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
7191 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
7192 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
7193 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
7194 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7195 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7196 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7197 case elfcpp::R_AARCH64_TLSDESC_CALL:
7198 reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type,
7199 gsym, psymval, view, address);
7202 // These are dynamic relocations, which are unexpected when linking.
7203 case elfcpp::R_AARCH64_COPY:
7204 case elfcpp::R_AARCH64_GLOB_DAT:
7205 case elfcpp::R_AARCH64_JUMP_SLOT:
7206 case elfcpp::R_AARCH64_RELATIVE:
7207 case elfcpp::R_AARCH64_IRELATIVE:
7208 case elfcpp::R_AARCH64_TLS_DTPREL64:
7209 case elfcpp::R_AARCH64_TLS_DTPMOD64:
7210 case elfcpp::R_AARCH64_TLS_TPREL64:
7211 case elfcpp::R_AARCH64_TLSDESC:
7212 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7213 _("unexpected reloc %u in object file"),
7218 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7219 _("unsupported reloc %s"),
7220 reloc_property->name().c_str());
7224 // Report any errors.
7225 switch (reloc_status)
7227 case Reloc::STATUS_OKAY:
7229 case Reloc::STATUS_OVERFLOW:
7230 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7231 _("relocation overflow in %s"),
7232 reloc_property->name().c_str());
7234 case Reloc::STATUS_BAD_RELOC:
7235 gold_error_at_location(
7238 rela.get_r_offset(),
7239 _("unexpected opcode while processing relocation %s"),
7240 reloc_property->name().c_str());
7250 template<int size, bool big_endian>
7252 typename AArch64_relocate_functions<size, big_endian>::Status
7253 Target_aarch64<size, big_endian>::Relocate::relocate_tls(
7254 const Relocate_info<size, big_endian>* relinfo,
7255 Target_aarch64<size, big_endian>* target,
7257 const elfcpp::Rela<size, big_endian>& rela,
7258 unsigned int r_type, const Sized_symbol<size>* gsym,
7259 const Symbol_value<size>* psymval,
7260 unsigned char* view,
7261 typename elfcpp::Elf_types<size>::Elf_Addr address)
7263 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7264 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7266 Output_segment* tls_segment = relinfo->layout->tls_segment();
7267 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7268 const AArch64_reloc_property* reloc_property =
7269 aarch64_reloc_property_table->get_reloc_property(r_type);
7270 gold_assert(reloc_property != NULL);
7272 const bool is_final = (gsym == NULL
7273 ? !parameters->options().shared()
7274 : gsym->final_value_is_known());
7275 tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>::
7276 optimize_tls_reloc(is_final, r_type);
7278 Sized_relobj_file<size, big_endian>* object = relinfo->object;
7279 int tls_got_offset_type;
7282 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7283 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic
7285 if (tlsopt == tls::TLSOPT_TO_LE)
7287 if (tls_segment == NULL)
7289 gold_assert(parameters->errors()->error_count() > 0
7290 || issue_undefined_symbol_error(gsym));
7291 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7293 return tls_gd_to_le(relinfo, target, rela, r_type, view,
7296 else if (tlsopt == tls::TLSOPT_NONE)
7298 tls_got_offset_type = GOT_TYPE_TLS_PAIR;
7299 // Firstly get the address for the got entry.
7300 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7303 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7304 got_entry_address = target->got_->address() +
7305 gsym->got_offset(tls_got_offset_type);
7309 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7311 object->local_has_got_offset(r_sym, tls_got_offset_type));
7312 got_entry_address = target->got_->address() +
7313 object->local_got_offset(r_sym, tls_got_offset_type);
7316 // Relocate the address into adrp/ld, adrp/add pair.
7319 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21:
7320 return aarch64_reloc_funcs::adrp(
7321 view, got_entry_address + addend, address);
7325 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC:
7326 return aarch64_reloc_funcs::template rela_general<32>(
7327 view, got_entry_address, addend, reloc_property);
7334 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
7335 _("unsupported gd_to_ie relaxation on %u"),
7340 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7341 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic
7343 if (tlsopt == tls::TLSOPT_TO_LE)
7345 if (tls_segment == NULL)
7347 gold_assert(parameters->errors()->error_count() > 0
7348 || issue_undefined_symbol_error(gsym));
7349 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7351 return this->tls_ld_to_le(relinfo, target, rela, r_type, view,
7355 gold_assert(tlsopt == tls::TLSOPT_NONE);
7356 // Relocate the field with the offset of the GOT entry for
7357 // the module index.
7358 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7359 got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) +
7360 target->got_->address());
7364 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21:
7365 return aarch64_reloc_funcs::adrp(
7366 view, got_entry_address + addend, address);
7369 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC:
7370 return aarch64_reloc_funcs::template rela_general<32>(
7371 view, got_entry_address, addend, reloc_property);
7380 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7381 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7382 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7383 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic
7385 AArch64_address value = psymval->value(object, 0);
7386 if (tlsopt == tls::TLSOPT_TO_LE)
7388 if (tls_segment == NULL)
7390 gold_assert(parameters->errors()->error_count() > 0
7391 || issue_undefined_symbol_error(gsym));
7392 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7397 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1:
7398 return aarch64_reloc_funcs::movnz(view, value + addend,
7402 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC:
7403 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12:
7404 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC:
7405 return aarch64_reloc_funcs::template rela_general<32>(
7406 view, value, addend, reloc_property);
7412 // We should never reach here.
7416 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7417 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec
7419 if (tlsopt == tls::TLSOPT_TO_LE)
7421 if (tls_segment == NULL)
7423 gold_assert(parameters->errors()->error_count() > 0
7424 || issue_undefined_symbol_error(gsym));
7425 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7427 return tls_ie_to_le(relinfo, target, rela, r_type, view,
7430 tls_got_offset_type = GOT_TYPE_TLS_OFFSET;
7432 // Firstly get the address for the got entry.
7433 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7436 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7437 got_entry_address = target->got_->address() +
7438 gsym->got_offset(tls_got_offset_type);
7442 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7444 object->local_has_got_offset(r_sym, tls_got_offset_type));
7445 got_entry_address = target->got_->address() +
7446 object->local_got_offset(r_sym, tls_got_offset_type);
7448 // Relocate the address into adrp/ld, adrp/add pair.
7451 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21:
7452 return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
7455 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC:
7456 return aarch64_reloc_funcs::template rela_general<32>(
7457 view, got_entry_address, addend, reloc_property);
7462 // We shall never reach here.
7465 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7466 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7467 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC:
7468 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7469 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC:
7470 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12:
7471 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12:
7472 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC:
7474 gold_assert(tls_segment != NULL);
7475 AArch64_address value = psymval->value(object, 0);
7477 if (!parameters->options().shared())
7479 AArch64_address aligned_tcb_size =
7480 align_address(target->tcb_size(),
7481 tls_segment->maximum_alignment());
7482 value += aligned_tcb_size;
7485 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2:
7486 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1:
7487 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0:
7488 return aarch64_reloc_funcs::movnz(view, value + addend,
7491 return aarch64_reloc_funcs::template
7492 rela_general<32>(view,
7499 gold_error(_("%s: unsupported reloc %u "
7500 "in non-static TLSLE mode."),
7501 object->name().c_str(), r_type);
7505 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7506 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7507 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7508 case elfcpp::R_AARCH64_TLSDESC_CALL:
7510 if (tlsopt == tls::TLSOPT_TO_LE)
7512 if (tls_segment == NULL)
7514 gold_assert(parameters->errors()->error_count() > 0
7515 || issue_undefined_symbol_error(gsym));
7516 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7518 return tls_desc_gd_to_le(relinfo, target, rela, r_type,
7523 tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE
7524 ? GOT_TYPE_TLS_OFFSET
7525 : GOT_TYPE_TLS_DESC);
7526 unsigned int got_tlsdesc_offset = 0;
7527 if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL
7528 && tlsopt == tls::TLSOPT_NONE)
7530 // We created GOT entries in the .got.tlsdesc portion of the
7531 // .got.plt section, but the offset stored in the symbol is the
7532 // offset within .got.tlsdesc.
7533 got_tlsdesc_offset = (target->got_->data_size()
7534 + target->got_plt_section()->data_size());
7536 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address;
7539 gold_assert(gsym->has_got_offset(tls_got_offset_type));
7540 got_entry_address = target->got_->address()
7541 + got_tlsdesc_offset
7542 + gsym->got_offset(tls_got_offset_type);
7546 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7548 object->local_has_got_offset(r_sym, tls_got_offset_type));
7549 got_entry_address = target->got_->address() +
7550 got_tlsdesc_offset +
7551 object->local_got_offset(r_sym, tls_got_offset_type);
7553 if (tlsopt == tls::TLSOPT_TO_IE)
7555 return tls_desc_gd_to_ie(relinfo, target, rela, r_type,
7556 view, psymval, got_entry_address,
7560 // Now do tlsdesc relocation.
7563 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7564 return aarch64_reloc_funcs::adrp(view,
7565 got_entry_address + addend,
7568 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7569 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7570 return aarch64_reloc_funcs::template rela_general<32>(
7571 view, got_entry_address, addend, reloc_property);
7573 case elfcpp::R_AARCH64_TLSDESC_CALL:
7574 return aarch64_reloc_funcs::STATUS_OKAY;
7584 gold_error(_("%s: unsupported TLS reloc %u."),
7585 object->name().c_str(), r_type);
7587 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7588 } // End of relocate_tls.
7591 template<int size, bool big_endian>
7593 typename AArch64_relocate_functions<size, big_endian>::Status
7594 Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le(
7595 const Relocate_info<size, big_endian>* relinfo,
7596 Target_aarch64<size, big_endian>* target,
7597 const elfcpp::Rela<size, big_endian>& rela,
7598 unsigned int r_type,
7599 unsigned char* view,
7600 const Symbol_value<size>* psymval)
7602 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7603 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7604 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7606 Insntype* ip = reinterpret_cast<Insntype*>(view);
7607 Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
7608 Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
7609 Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
7611 if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC)
7613 // This is the 2nd relocs, optimization should already have been
7615 gold_assert((insn1 & 0xfff00000) == 0x91400000);
7616 return aarch64_reloc_funcs::STATUS_OKAY;
7619 // The original sequence is -
7620 // 90000000 adrp x0, 0 <main>
7621 // 91000000 add x0, x0, #0x0
7622 // 94000000 bl 0 <__tls_get_addr>
7623 // optimized to sequence -
7624 // d53bd040 mrs x0, tpidr_el0
7625 // 91400000 add x0, x0, #0x0, lsl #12
7626 // 91000000 add x0, x0, #0x0
7628 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7629 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7630 // have to change "bl tls_get_addr", which does not have a corresponding tls
7631 // relocation type. So before proceeding, we need to make sure compiler
7632 // does not change the sequence.
7633 if(!(insn1 == 0x90000000 // adrp x0,0
7634 && insn2 == 0x91000000 // add x0, x0, #0x0
7635 && insn3 == 0x94000000)) // bl 0
7637 // Ideally we should give up gd_to_le relaxation and do gd access.
7638 // However the gd_to_le relaxation decision has been made early
7639 // in the scan stage, where we did not allocate any GOT entry for
7640 // this symbol. Therefore we have to exit and report error now.
7641 gold_error(_("unexpected reloc insn sequence while relaxing "
7642 "tls gd to le for reloc %u."), r_type);
7643 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7647 insn1 = 0xd53bd040; // mrs x0, tpidr_el0
7648 insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12
7649 insn3 = 0x91000000; // add x0, x0, #0x0
7650 elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
7651 elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
7652 elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
7654 // Calculate tprel value.
7655 Output_segment* tls_segment = relinfo->layout->tls_segment();
7656 gold_assert(tls_segment != NULL);
7657 AArch64_address value = psymval->value(relinfo->object, 0);
7658 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7659 AArch64_address aligned_tcb_size =
7660 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7661 AArch64_address x = value + aligned_tcb_size;
7663 // After new insns are written, apply TLSLE relocs.
7664 const AArch64_reloc_property* rp1 =
7665 aarch64_reloc_property_table->get_reloc_property(
7666 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
7667 const AArch64_reloc_property* rp2 =
7668 aarch64_reloc_property_table->get_reloc_property(
7669 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
7670 gold_assert(rp1 != NULL && rp2 != NULL);
7672 typename aarch64_reloc_funcs::Status s1 =
7673 aarch64_reloc_funcs::template rela_general<32>(view + 4,
7677 if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
7680 typename aarch64_reloc_funcs::Status s2 =
7681 aarch64_reloc_funcs::template rela_general<32>(view + 8,
7686 this->skip_call_tls_get_addr_ = true;
7688 } // End of tls_gd_to_le
7691 template<int size, bool big_endian>
7693 typename AArch64_relocate_functions<size, big_endian>::Status
7694 Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le(
7695 const Relocate_info<size, big_endian>* relinfo,
7696 Target_aarch64<size, big_endian>* target,
7697 const elfcpp::Rela<size, big_endian>& rela,
7698 unsigned int r_type,
7699 unsigned char* view,
7700 const Symbol_value<size>* psymval)
7702 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7703 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7704 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7706 Insntype* ip = reinterpret_cast<Insntype*>(view);
7707 Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip);
7708 Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1);
7709 Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2);
7711 if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC)
7713 // This is the 2nd relocs, optimization should already have been
7715 gold_assert((insn1 & 0xfff00000) == 0x91400000);
7716 return aarch64_reloc_funcs::STATUS_OKAY;
7719 // The original sequence is -
7720 // 90000000 adrp x0, 0 <main>
7721 // 91000000 add x0, x0, #0x0
7722 // 94000000 bl 0 <__tls_get_addr>
7723 // optimized to sequence -
7724 // d53bd040 mrs x0, tpidr_el0
7725 // 91400000 add x0, x0, #0x0, lsl #12
7726 // 91000000 add x0, x0, #0x0
7728 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7729 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7730 // have to change "bl tls_get_addr", which does not have a corresponding tls
7731 // relocation type. So before proceeding, we need to make sure compiler
7732 // does not change the sequence.
7733 if(!(insn1 == 0x90000000 // adrp x0,0
7734 && insn2 == 0x91000000 // add x0, x0, #0x0
7735 && insn3 == 0x94000000)) // bl 0
7737 // Ideally we should give up gd_to_le relaxation and do gd access.
7738 // However the gd_to_le relaxation decision has been made early
7739 // in the scan stage, where we did not allocate any GOT entry for
7740 // this symbol. Therefore we have to exit and report error now.
7741 gold_error(_("unexpected reloc insn sequence while relaxing "
7742 "tls gd to le for reloc %u."), r_type);
7743 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7747 insn1 = 0xd53bd040; // mrs x0, tpidr_el0
7748 insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12
7749 insn3 = 0x91000000; // add x0, x0, #0x0
7750 elfcpp::Swap<32, big_endian>::writeval(ip, insn1);
7751 elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2);
7752 elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3);
7754 // Calculate tprel value.
7755 Output_segment* tls_segment = relinfo->layout->tls_segment();
7756 gold_assert(tls_segment != NULL);
7757 AArch64_address value = psymval->value(relinfo->object, 0);
7758 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7759 AArch64_address aligned_tcb_size =
7760 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7761 AArch64_address x = value + aligned_tcb_size;
7763 // After new insns are written, apply TLSLE relocs.
7764 const AArch64_reloc_property* rp1 =
7765 aarch64_reloc_property_table->get_reloc_property(
7766 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12);
7767 const AArch64_reloc_property* rp2 =
7768 aarch64_reloc_property_table->get_reloc_property(
7769 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12);
7770 gold_assert(rp1 != NULL && rp2 != NULL);
7772 typename aarch64_reloc_funcs::Status s1 =
7773 aarch64_reloc_funcs::template rela_general<32>(view + 4,
7777 if (s1 != aarch64_reloc_funcs::STATUS_OKAY)
7780 typename aarch64_reloc_funcs::Status s2 =
7781 aarch64_reloc_funcs::template rela_general<32>(view + 8,
7786 this->skip_call_tls_get_addr_ = true;
7789 } // End of tls_ld_to_le
7791 template<int size, bool big_endian>
7793 typename AArch64_relocate_functions<size, big_endian>::Status
7794 Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le(
7795 const Relocate_info<size, big_endian>* relinfo,
7796 Target_aarch64<size, big_endian>* target,
7797 const elfcpp::Rela<size, big_endian>& rela,
7798 unsigned int r_type,
7799 unsigned char* view,
7800 const Symbol_value<size>* psymval)
7802 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7803 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7804 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7806 AArch64_address value = psymval->value(relinfo->object, 0);
7807 Output_segment* tls_segment = relinfo->layout->tls_segment();
7808 AArch64_address aligned_tcb_address =
7809 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7810 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7811 AArch64_address x = value + addend + aligned_tcb_address;
7812 // "x" is the offset to tp, we can only do this if x is within
7813 // range [0, 2^32-1]
7814 if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0)))
7816 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7818 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7821 Insntype* ip = reinterpret_cast<Insntype*>(view);
7822 Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
7825 if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21)
7828 regno = (insn & 0x1f);
7829 newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5);
7831 else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC)
7834 regno = (insn & 0x1f);
7835 gold_assert(regno == ((insn >> 5) & 0x1f));
7836 newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5);
7841 elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7842 return aarch64_reloc_funcs::STATUS_OKAY;
7843 } // End of tls_ie_to_le
7846 template<int size, bool big_endian>
7848 typename AArch64_relocate_functions<size, big_endian>::Status
7849 Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le(
7850 const Relocate_info<size, big_endian>* relinfo,
7851 Target_aarch64<size, big_endian>* target,
7852 const elfcpp::Rela<size, big_endian>& rela,
7853 unsigned int r_type,
7854 unsigned char* view,
7855 const Symbol_value<size>* psymval)
7857 typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address;
7858 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7859 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7861 // TLSDESC-GD sequence is like:
7862 // adrp x0, :tlsdesc:v1
7863 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7864 // add x0, x0, :tlsdesc_lo12:v1
7867 // After desc_gd_to_le optimization, the sequence will be like:
7868 // movz x0, #0x0, lsl #16
7873 // Calculate tprel value.
7874 Output_segment* tls_segment = relinfo->layout->tls_segment();
7875 gold_assert(tls_segment != NULL);
7876 Insntype* ip = reinterpret_cast<Insntype*>(view);
7877 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7878 AArch64_address value = psymval->value(relinfo->object, addend);
7879 AArch64_address aligned_tcb_size =
7880 align_address(target->tcb_size(), tls_segment->maximum_alignment());
7881 AArch64_address x = value + aligned_tcb_size;
7882 // x is the offset to tp, we can only do this if x is within range
7883 // [0, 2^32-1]. If x is out of range, fail and exit.
7884 if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0)
7886 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7887 "We Can't do gd_to_le relaxation.\n"), r_type);
7888 return aarch64_reloc_funcs::STATUS_BAD_RELOC;
7893 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7894 case elfcpp::R_AARCH64_TLSDESC_CALL:
7896 newinsn = 0xd503201f;
7899 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7901 newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5);
7904 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7906 newinsn = 0xf2800000 | ((x & 0xffff) << 5);
7910 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7914 elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7915 return aarch64_reloc_funcs::STATUS_OKAY;
7916 } // End of tls_desc_gd_to_le
7919 template<int size, bool big_endian>
7921 typename AArch64_relocate_functions<size, big_endian>::Status
7922 Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie(
7923 const Relocate_info<size, big_endian>* /* relinfo */,
7924 Target_aarch64<size, big_endian>* /* target */,
7925 const elfcpp::Rela<size, big_endian>& rela,
7926 unsigned int r_type,
7927 unsigned char* view,
7928 const Symbol_value<size>* /* psymval */,
7929 typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address,
7930 typename elfcpp::Elf_types<size>::Elf_Addr address)
7932 typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype;
7933 typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs;
7935 // TLSDESC-GD sequence is like:
7936 // adrp x0, :tlsdesc:v1
7937 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7938 // add x0, x0, :tlsdesc_lo12:v1
7941 // After desc_gd_to_ie optimization, the sequence will be like:
7942 // adrp x0, :tlsie:v1
7943 // ldr x0, [x0, :tlsie_lo12:v1]
7947 Insntype* ip = reinterpret_cast<Insntype*>(view);
7948 const elfcpp::Elf_Xword addend = rela.get_r_addend();
7952 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12:
7953 case elfcpp::R_AARCH64_TLSDESC_CALL:
7955 newinsn = 0xd503201f;
7956 elfcpp::Swap<32, big_endian>::writeval(ip, newinsn);
7959 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21:
7961 return aarch64_reloc_funcs::adrp(view, got_entry_address + addend,
7966 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12:
7968 // Set ldr target register to be x0.
7969 Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip);
7971 elfcpp::Swap<32, big_endian>::writeval(ip, insn);
7973 const AArch64_reloc_property* reloc_property =
7974 aarch64_reloc_property_table->get_reloc_property(
7975 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC);
7976 return aarch64_reloc_funcs::template rela_general<32>(
7977 view, got_entry_address, addend, reloc_property);
7982 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7986 return aarch64_reloc_funcs::STATUS_OKAY;
7987 } // End of tls_desc_gd_to_ie
7989 // Relocate section data.
7991 template<int size, bool big_endian>
7993 Target_aarch64<size, big_endian>::relocate_section(
7994 const Relocate_info<size, big_endian>* relinfo,
7995 unsigned int sh_type,
7996 const unsigned char* prelocs,
7998 Output_section* output_section,
7999 bool needs_special_offset_handling,
8000 unsigned char* view,
8001 typename elfcpp::Elf_types<size>::Elf_Addr address,
8002 section_size_type view_size,
8003 const Reloc_symbol_changes* reloc_symbol_changes)
8005 typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
8006 typedef Target_aarch64<size, big_endian> Aarch64;
8007 typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate;
8008 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
8011 gold_assert(sh_type == elfcpp::SHT_RELA);
8013 // See if we are relocating a relaxed input section. If so, the view
8014 // covers the whole output section and we need to adjust accordingly.
8015 if (needs_special_offset_handling)
8017 const Output_relaxed_input_section* poris =
8018 output_section->find_relaxed_input_section(relinfo->object,
8019 relinfo->data_shndx);
8022 Address section_address = poris->address();
8023 section_size_type section_size = poris->data_size();
8025 gold_assert((section_address >= address)
8026 && ((section_address + section_size)
8027 <= (address + view_size)));
8029 off_t offset = section_address - address;
8032 view_size = section_size;
8036 gold::relocate_section<size, big_endian, Aarch64, AArch64_relocate,
8037 gold::Default_comdat_behavior, Classify_reloc>(
8043 needs_special_offset_handling,
8047 reloc_symbol_changes);
8050 // Scan the relocs during a relocatable link.
8052 template<int size, bool big_endian>
8054 Target_aarch64<size, big_endian>::scan_relocatable_relocs(
8055 Symbol_table* symtab,
8057 Sized_relobj_file<size, big_endian>* object,
8058 unsigned int data_shndx,
8059 unsigned int sh_type,
8060 const unsigned char* prelocs,
8062 Output_section* output_section,
8063 bool needs_special_offset_handling,
8064 size_t local_symbol_count,
8065 const unsigned char* plocal_symbols,
8066 Relocatable_relocs* rr)
8068 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
8070 typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
8071 Scan_relocatable_relocs;
8073 gold_assert(sh_type == elfcpp::SHT_RELA);
8075 gold::scan_relocatable_relocs<size, big_endian, Scan_relocatable_relocs>(
8083 needs_special_offset_handling,
8089 // Scan the relocs for --emit-relocs.
8091 template<int size, bool big_endian>
8093 Target_aarch64<size, big_endian>::emit_relocs_scan(
8094 Symbol_table* symtab,
8096 Sized_relobj_file<size, big_endian>* object,
8097 unsigned int data_shndx,
8098 unsigned int sh_type,
8099 const unsigned char* prelocs,
8101 Output_section* output_section,
8102 bool needs_special_offset_handling,
8103 size_t local_symbol_count,
8104 const unsigned char* plocal_syms,
8105 Relocatable_relocs* rr)
8107 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
8109 typedef gold::Default_emit_relocs_strategy<Classify_reloc>
8110 Emit_relocs_strategy;
8112 gold_assert(sh_type == elfcpp::SHT_RELA);
8114 gold::scan_relocatable_relocs<size, big_endian, Emit_relocs_strategy>(
8122 needs_special_offset_handling,
8128 // Relocate a section during a relocatable link.
8130 template<int size, bool big_endian>
8132 Target_aarch64<size, big_endian>::relocate_relocs(
8133 const Relocate_info<size, big_endian>* relinfo,
8134 unsigned int sh_type,
8135 const unsigned char* prelocs,
8137 Output_section* output_section,
8138 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
8139 unsigned char* view,
8140 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
8141 section_size_type view_size,
8142 unsigned char* reloc_view,
8143 section_size_type reloc_view_size)
8145 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, big_endian>
8148 gold_assert(sh_type == elfcpp::SHT_RELA);
8150 gold::relocate_relocs<size, big_endian, Classify_reloc>(
8155 offset_in_output_section,
8164 // Return whether this is a 3-insn erratum sequence.
8166 template<int size, bool big_endian>
8168 Target_aarch64<size, big_endian>::is_erratum_843419_sequence(
8169 typename elfcpp::Swap<32,big_endian>::Valtype insn1,
8170 typename elfcpp::Swap<32,big_endian>::Valtype insn2,
8171 typename elfcpp::Swap<32,big_endian>::Valtype insn3)
8176 // The 2nd insn is a single register load or store; or register pair
8178 if (Insn_utilities::aarch64_mem_op_p(insn2, &rt1, &rt2, &pair, &load)
8179 && (!pair || (pair && !load)))
8181 // The 3rd insn is a load or store instruction from the "Load/store
8182 // register (unsigned immediate)" encoding class, using Rn as the
8183 // base address register.
8184 if (Insn_utilities::aarch64_ldst_uimm(insn3)
8185 && (Insn_utilities::aarch64_rn(insn3)
8186 == Insn_utilities::aarch64_rd(insn1)))
8193 // Return whether this is a 835769 sequence.
8194 // (Similarly implemented as in elfnn-aarch64.c.)
8196 template<int size, bool big_endian>
8198 Target_aarch64<size, big_endian>::is_erratum_835769_sequence(
8199 typename elfcpp::Swap<32,big_endian>::Valtype insn1,
8200 typename elfcpp::Swap<32,big_endian>::Valtype insn2)
8210 if (Insn_utilities::aarch64_mlxl(insn2)
8211 && Insn_utilities::aarch64_mem_op_p (insn1, &rt, &rt2, &pair, &load))
8213 /* Any SIMD memory op is independent of the subsequent MLA
8214 by definition of the erratum. */
8215 if (Insn_utilities::aarch64_bit(insn1, 26))
8218 /* If not SIMD, check for integer memory ops and MLA relationship. */
8219 rn = Insn_utilities::aarch64_rn(insn2);
8220 ra = Insn_utilities::aarch64_ra(insn2);
8221 rm = Insn_utilities::aarch64_rm(insn2);
8223 /* If this is a load and there's a true(RAW) dependency, we are safe
8224 and this is not an erratum sequence. */
8226 (rt == rn || rt == rm || rt == ra
8227 || (pair && (rt2 == rn || rt2 == rm || rt2 == ra))))
8230 /* We conservatively put out stubs for all other cases (including
8239 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8241 template<int size, bool big_endian>
8243 Target_aarch64<size, big_endian>::create_erratum_stub(
8244 AArch64_relobj<size, big_endian>* relobj,
8246 section_size_type erratum_insn_offset,
8247 Address erratum_address,
8248 typename Insn_utilities::Insntype erratum_insn,
8250 unsigned int e843419_adrp_offset)
8252 gold_assert(erratum_type == ST_E_843419 || erratum_type == ST_E_835769);
8253 The_stub_table* stub_table = relobj->stub_table(shndx);
8254 gold_assert(stub_table != NULL);
8255 if (stub_table->find_erratum_stub(relobj,
8257 erratum_insn_offset) == NULL)
8259 const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
8260 The_erratum_stub* stub;
8261 if (erratum_type == ST_E_835769)
8262 stub = new The_erratum_stub(relobj, erratum_type, shndx,
8263 erratum_insn_offset);
8264 else if (erratum_type == ST_E_843419)
8265 stub = new E843419_stub<size, big_endian>(
8266 relobj, shndx, erratum_insn_offset, e843419_adrp_offset);
8269 stub->set_erratum_insn(erratum_insn);
8270 stub->set_erratum_address(erratum_address);
8271 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8272 // always the next insn after erratum insn.
8273 stub->set_destination_address(erratum_address + BPI);
8274 stub_table->add_erratum_stub(stub);
8279 // Scan erratum for section SHNDX range [output_address + span_start,
8280 // output_address + span_end). Note here we do not share the code with
8281 // scan_erratum_843419_span function, because for 843419 we optimize by only
8282 // scanning the last few insns of a page, whereas for 835769, we need to scan
8285 template<int size, bool big_endian>
8287 Target_aarch64<size, big_endian>::scan_erratum_835769_span(
8288 AArch64_relobj<size, big_endian>* relobj,
8290 const section_size_type span_start,
8291 const section_size_type span_end,
8292 unsigned char* input_view,
8293 Address output_address)
8295 typedef typename Insn_utilities::Insntype Insntype;
8297 const int BPI = AArch64_insn_utilities<big_endian>::BYTES_PER_INSN;
8299 // Adjust output_address and view to the start of span.
8300 output_address += span_start;
8301 input_view += span_start;
8303 section_size_type span_length = span_end - span_start;
8304 section_size_type offset = 0;
8305 for (offset = 0; offset + BPI < span_length; offset += BPI)
8307 Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
8308 Insntype insn1 = ip[0];
8309 Insntype insn2 = ip[1];
8310 if (is_erratum_835769_sequence(insn1, insn2))
8312 Insntype erratum_insn = insn2;
8313 // "span_start + offset" is the offset for insn1. So for insn2, it is
8314 // "span_start + offset + BPI".
8315 section_size_type erratum_insn_offset = span_start + offset + BPI;
8316 Address erratum_address = output_address + offset + BPI;
8317 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8318 "section %d, offset 0x%08x."),
8319 relobj->name().c_str(), shndx,
8320 (unsigned int)(span_start + offset));
8322 this->create_erratum_stub(relobj, shndx,
8323 erratum_insn_offset, erratum_address,
8324 erratum_insn, ST_E_835769);
8325 offset += BPI; // Skip mac insn.
8328 } // End of "Target_aarch64::scan_erratum_835769_span".
8331 // Scan erratum for section SHNDX range
8332 // [output_address + span_start, output_address + span_end).
8334 template<int size, bool big_endian>
8336 Target_aarch64<size, big_endian>::scan_erratum_843419_span(
8337 AArch64_relobj<size, big_endian>* relobj,
8339 const section_size_type span_start,
8340 const section_size_type span_end,
8341 unsigned char* input_view,
8342 Address output_address)
8344 typedef typename Insn_utilities::Insntype Insntype;
8346 // Adjust output_address and view to the start of span.
8347 output_address += span_start;
8348 input_view += span_start;
8350 if ((output_address & 0x03) != 0)
8353 section_size_type offset = 0;
8354 section_size_type span_length = span_end - span_start;
8355 // The first instruction must be ending at 0xFF8 or 0xFFC.
8356 unsigned int page_offset = output_address & 0xFFF;
8357 // Make sure starting position, that is "output_address+offset",
8358 // starts at page position 0xff8 or 0xffc.
8359 if (page_offset < 0xff8)
8360 offset = 0xff8 - page_offset;
8361 while (offset + 3 * Insn_utilities::BYTES_PER_INSN <= span_length)
8363 Insntype* ip = reinterpret_cast<Insntype*>(input_view + offset);
8364 Insntype insn1 = ip[0];
8365 if (Insn_utilities::is_adrp(insn1))
8367 Insntype insn2 = ip[1];
8368 Insntype insn3 = ip[2];
8369 Insntype erratum_insn;
8370 unsigned insn_offset;
8371 bool do_report = false;
8372 if (is_erratum_843419_sequence(insn1, insn2, insn3))
8375 erratum_insn = insn3;
8376 insn_offset = 2 * Insn_utilities::BYTES_PER_INSN;
8378 else if (offset + 4 * Insn_utilities::BYTES_PER_INSN <= span_length)
8380 // Optionally we can have an insn between ins2 and ins3
8381 Insntype insn_opt = ip[2];
8382 // And insn_opt must not be a branch.
8383 if (!Insn_utilities::aarch64_b(insn_opt)
8384 && !Insn_utilities::aarch64_bl(insn_opt)
8385 && !Insn_utilities::aarch64_blr(insn_opt)
8386 && !Insn_utilities::aarch64_br(insn_opt))
8388 // And insn_opt must not write to dest reg in insn1. However
8389 // we do a conservative scan, which means we may fix/report
8390 // more than necessary, but it doesn't hurt.
8392 Insntype insn4 = ip[3];
8393 if (is_erratum_843419_sequence(insn1, insn2, insn4))
8396 erratum_insn = insn4;
8397 insn_offset = 3 * Insn_utilities::BYTES_PER_INSN;
8403 unsigned int erratum_insn_offset =
8404 span_start + offset + insn_offset;
8405 Address erratum_address =
8406 output_address + offset + insn_offset;
8407 create_erratum_stub(relobj, shndx,
8408 erratum_insn_offset, erratum_address,
8409 erratum_insn, ST_E_843419,
8410 span_start + offset);
8414 // Advance to next candidate instruction. We only consider instruction
8415 // sequences starting at a page offset of 0xff8 or 0xffc.
8416 page_offset = (output_address + offset) & 0xfff;
8417 if (page_offset == 0xff8)
8419 else // (page_offset == 0xffc), we move to next page's 0xff8.
8422 } // End of "Target_aarch64::scan_erratum_843419_span".
8425 // The selector for aarch64 object files.
8427 template<int size, bool big_endian>
8428 class Target_selector_aarch64 : public Target_selector
8431 Target_selector_aarch64();
8434 do_instantiate_target()
8435 { return new Target_aarch64<size, big_endian>(); }
8439 Target_selector_aarch64<32, true>::Target_selector_aarch64()
8440 : Target_selector(elfcpp::EM_AARCH64, 32, true,
8441 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8445 Target_selector_aarch64<32, false>::Target_selector_aarch64()
8446 : Target_selector(elfcpp::EM_AARCH64, 32, false,
8447 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8451 Target_selector_aarch64<64, true>::Target_selector_aarch64()
8452 : Target_selector(elfcpp::EM_AARCH64, 64, true,
8453 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8457 Target_selector_aarch64<64, false>::Target_selector_aarch64()
8458 : Target_selector(elfcpp::EM_AARCH64, 64, false,
8459 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8462 Target_selector_aarch64<32, true> target_selector_aarch64elf32b;
8463 Target_selector_aarch64<32, false> target_selector_aarch64elf32;
8464 Target_selector_aarch64<64, true> target_selector_aarch64elfb;
8465 Target_selector_aarch64<64, false> target_selector_aarch64elf;
8467 } // End anonymous namespace.