1 // aarch64.cc -- aarch64 target support for gold.
3 // Copyright (C) 2014-2023 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 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 branch 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 // Later relaxation passes of may alter the recorded erratum and destination
1035 // address. Given an up to date output section address of shidx_ in
1036 // relobj_ we can derive the erratum_address and destination address.
1038 update_erratum_address(AArch64_address output_section_addr
)
1040 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1041 AArch64_address updated_addr
= output_section_addr
+ this->sh_offset_
;
1042 this->set_erratum_address(updated_addr
);
1043 this->set_destination_address(updated_addr
+ BPI
);
1046 // Comparator used to group Erratum_stubs in a set by (obj, shndx,
1047 // sh_offset). We do not include 'type' in the calculation, because there is
1048 // at most one stub type at (obj, shndx, sh_offset).
1050 operator<(const Erratum_stub
<size
, big_endian
>& k
) const
1054 // We group stubs by relobj.
1055 if (this->relobj_
!= k
.relobj_
)
1056 return this->relobj_
< k
.relobj_
;
1057 // Then by section index.
1058 if (this->shndx_
!= k
.shndx_
)
1059 return this->shndx_
< k
.shndx_
;
1060 // Lastly by section offset.
1061 return this->sh_offset_
< k
.sh_offset_
;
1065 invalidate_erratum_stub()
1067 gold_assert(this->erratum_insn_
!= invalid_insn
);
1068 this->erratum_insn_
= invalid_insn
;
1072 is_invalidated_erratum_stub()
1073 { return this->erratum_insn_
== invalid_insn
; }
1077 do_write(unsigned char*, section_size_type
);
1080 // The object that needs to be fixed.
1081 The_aarch64_relobj
* relobj_
;
1082 // The shndx in the object that needs to be fixed.
1083 const unsigned int shndx_
;
1084 // The section offset in the obejct that needs to be fixed.
1085 const unsigned int sh_offset_
;
1086 // The insn to be fixed.
1087 Insntype erratum_insn_
;
1088 // The address of the above insn.
1089 AArch64_address erratum_address_
;
1090 }; // End of "Erratum_stub".
1093 // Erratum sub class to wrap additional info needed by 843419. In fixing this
1094 // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need
1095 // adrp's code position (two or three insns before erratum insn itself).
1097 template<int size
, bool big_endian
>
1098 class E843419_stub
: public Erratum_stub
<size
, big_endian
>
1101 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
1103 E843419_stub(AArch64_relobj
<size
, big_endian
>* relobj
,
1104 unsigned int shndx
, unsigned int sh_offset
,
1105 unsigned int adrp_sh_offset
)
1106 : Erratum_stub
<size
, big_endian
>(relobj
, ST_E_843419
, shndx
, sh_offset
),
1107 adrp_sh_offset_(adrp_sh_offset
)
1111 adrp_sh_offset() const
1112 { return this->adrp_sh_offset_
; }
1115 // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we
1116 // can obtain it from its parent.)
1117 const unsigned int adrp_sh_offset_
;
1121 template<int size
, bool big_endian
>
1122 const int Erratum_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1124 // Comparator used in set definition.
1125 template<int size
, bool big_endian
>
1126 struct Erratum_stub_less
1129 operator()(const Erratum_stub
<size
, big_endian
>* s1
,
1130 const Erratum_stub
<size
, big_endian
>* s2
) const
1131 { return *s1
< *s2
; }
1134 // Erratum_stub implementation for writing stub to output file.
1136 template<int size
, bool big_endian
>
1138 Erratum_stub
<size
, big_endian
>::do_write(unsigned char* view
, section_size_type
)
1140 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1141 const Insntype
* insns
= this->insns();
1142 uint32_t num_insns
= this->insn_num();
1143 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1144 // For current implemented erratum 843419 and 835769, the first insn in the
1145 // stub is always a copy of the problematic insn (in 843419, the mem access
1146 // insn, in 835769, the mac insn), followed by a jump-back.
1147 elfcpp::Swap
<32, big_endian
>::writeval(ip
, this->erratum_insn());
1148 for (uint32_t i
= 1; i
< num_insns
; ++i
)
1149 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1153 // Reloc stub class.
1155 template<int size
, bool big_endian
>
1156 class Reloc_stub
: public Stub_base
<size
, big_endian
>
1159 typedef Reloc_stub
<size
, big_endian
> This
;
1160 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1162 // Branch range. This is used to calculate the section group size, as well as
1163 // determine whether a stub is needed.
1164 static const int MAX_BRANCH_OFFSET
= ((1 << 25) - 1) << 2;
1165 static const int MIN_BRANCH_OFFSET
= -((1 << 25) << 2);
1167 // Constant used to determine if an offset fits in the adrp instruction
1169 static const int MAX_ADRP_IMM
= (1 << 20) - 1;
1170 static const int MIN_ADRP_IMM
= -(1 << 20);
1172 static const int BYTES_PER_INSN
= 4;
1173 static const int STUB_ADDR_ALIGN
;
1175 // Determine whether the offset fits in the jump/branch instruction.
1177 aarch64_valid_branch_offset_p(int64_t offset
)
1178 { return offset
>= MIN_BRANCH_OFFSET
&& offset
<= MAX_BRANCH_OFFSET
; }
1180 // Determine whether the offset fits in the adrp immediate field.
1182 aarch64_valid_for_adrp_p(AArch64_address location
, AArch64_address dest
)
1184 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
1185 int64_t adrp_imm
= Reloc::Page (dest
) - Reloc::Page (location
);
1186 adrp_imm
= adrp_imm
< 0 ? ~(~adrp_imm
>> 12) : adrp_imm
>> 12;
1187 return adrp_imm
>= MIN_ADRP_IMM
&& adrp_imm
<= MAX_ADRP_IMM
;
1190 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1193 stub_type_for_reloc(unsigned int r_type
, AArch64_address address
,
1194 AArch64_address target
);
1196 Reloc_stub(int type
)
1197 : Stub_base
<size
, big_endian
>(type
)
1203 // The key class used to index the stub instance in the stub table's stub map.
1207 Key(int type
, const Symbol
* symbol
, const Relobj
* relobj
,
1208 unsigned int r_sym
, int32_t addend
)
1209 : type_(type
), addend_(addend
)
1213 this->r_sym_
= Reloc_stub::invalid_index
;
1214 this->u_
.symbol
= symbol
;
1218 gold_assert(relobj
!= NULL
&& r_sym
!= invalid_index
);
1219 this->r_sym_
= r_sym
;
1220 this->u_
.relobj
= relobj
;
1227 // Return stub type.
1230 { return this->type_
; }
1232 // Return the local symbol index or invalid_index.
1235 { return this->r_sym_
; }
1237 // Return the symbol if there is one.
1240 { return this->r_sym_
== invalid_index
? this->u_
.symbol
: NULL
; }
1242 // Return the relobj if there is one.
1245 { return this->r_sym_
!= invalid_index
? this->u_
.relobj
: NULL
; }
1247 // Whether this equals to another key k.
1249 eq(const Key
& k
) const
1251 return ((this->type_
== k
.type_
)
1252 && (this->r_sym_
== k
.r_sym_
)
1253 && ((this->r_sym_
!= Reloc_stub::invalid_index
)
1254 ? (this->u_
.relobj
== k
.u_
.relobj
)
1255 : (this->u_
.symbol
== k
.u_
.symbol
))
1256 && (this->addend_
== k
.addend_
));
1259 // Return a hash value.
1263 size_t name_hash_value
= gold::string_hash
<char>(
1264 (this->r_sym_
!= Reloc_stub::invalid_index
)
1265 ? this->u_
.relobj
->name().c_str()
1266 : this->u_
.symbol
->name());
1267 // We only have 4 stub types.
1268 size_t stub_type_hash_value
= 0x03 & this->type_
;
1269 return (name_hash_value
1270 ^ stub_type_hash_value
1271 ^ ((this->r_sym_
& 0x3fff) << 2)
1272 ^ ((this->addend_
& 0xffff) << 16));
1275 // Functors for STL associative containers.
1279 operator()(const Key
& k
) const
1280 { return k
.hash_value(); }
1286 operator()(const Key
& k1
, const Key
& k2
) const
1287 { return k1
.eq(k2
); }
1293 // If this is a local symbol, this is the index in the defining object.
1294 // Otherwise, it is invalid_index for a global symbol.
1295 unsigned int r_sym_
;
1296 // If r_sym_ is an invalid index, this points to a global symbol.
1297 // Otherwise, it points to a relobj. We used the unsized and target
1298 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1299 // Arm_relobj, in order to avoid making the stub class a template
1300 // as most of the stub machinery is endianness-neutral. However, it
1301 // may require a bit of casting done by users of this class.
1304 const Symbol
* symbol
;
1305 const Relobj
* relobj
;
1307 // Addend associated with a reloc.
1309 }; // End of inner class Reloc_stub::Key
1312 // This may be overridden in the child class.
1314 do_write(unsigned char*, section_size_type
);
1317 static const unsigned int invalid_index
= static_cast<unsigned int>(-1);
1318 }; // End of Reloc_stub
1320 template<int size
, bool big_endian
>
1321 const int Reloc_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1323 // Write data to output file.
1325 template<int size
, bool big_endian
>
1327 Reloc_stub
<size
, big_endian
>::
1328 do_write(unsigned char* view
, section_size_type
)
1330 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1331 const uint32_t* insns
= this->insns();
1332 uint32_t num_insns
= this->insn_num();
1333 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1334 for (uint32_t i
= 0; i
< num_insns
; ++i
)
1335 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1339 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1342 template<int size
, bool big_endian
>
1344 Reloc_stub
<size
, big_endian
>::stub_type_for_reloc(
1345 unsigned int r_type
, AArch64_address location
, AArch64_address dest
)
1347 int64_t branch_offset
= 0;
1350 case elfcpp::R_AARCH64_CALL26
:
1351 case elfcpp::R_AARCH64_JUMP26
:
1352 branch_offset
= dest
- location
;
1358 if (aarch64_valid_branch_offset_p(branch_offset
))
1361 if (aarch64_valid_for_adrp_p(location
, dest
))
1362 return ST_ADRP_BRANCH
;
1364 // Always use PC-relative addressing in case of -shared or -pie.
1365 if (parameters
->options().output_is_position_independent())
1366 return ST_LONG_BRANCH_PCREL
;
1368 // This saves 2 insns per stub, compared to ST_LONG_BRANCH_PCREL.
1369 // But is only applicable to non-shared or non-pie.
1370 return ST_LONG_BRANCH_ABS
;
1373 // A class to hold stubs for the ARM target. This contains 2 different types of
1374 // stubs - reloc stubs and erratum stubs.
1376 template<int size
, bool big_endian
>
1377 class Stub_table
: public Output_data
1380 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1381 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1382 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
1383 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1384 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
1385 typedef typename
The_reloc_stub::Key The_reloc_stub_key
;
1386 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1387 typedef Erratum_stub_less
<size
, big_endian
> The_erratum_stub_less
;
1388 typedef typename
The_reloc_stub_key::hash The_reloc_stub_key_hash
;
1389 typedef typename
The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to
;
1390 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1391 typedef Unordered_map
<The_reloc_stub_key
, The_reloc_stub
*,
1392 The_reloc_stub_key_hash
, The_reloc_stub_key_equal_to
>
1394 typedef typename
Reloc_stub_map::const_iterator Reloc_stub_map_const_iter
;
1395 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
1397 typedef std::set
<The_erratum_stub
*, The_erratum_stub_less
> Erratum_stub_set
;
1398 typedef typename
Erratum_stub_set::iterator Erratum_stub_set_iter
;
1400 Stub_table(The_aarch64_input_section
* owner
)
1401 : Output_data(), owner_(owner
), reloc_stubs_size_(0),
1402 erratum_stubs_size_(0), prev_data_size_(0)
1408 The_aarch64_input_section
*
1412 // Whether this stub table is empty.
1415 { return reloc_stubs_
.empty() && erratum_stubs_
.empty(); }
1417 // Return the current data size.
1419 current_data_size() const
1420 { return this->current_data_size_for_child(); }
1422 // Add a STUB using KEY. The caller is responsible for avoiding addition
1423 // if a STUB with the same key has already been added.
1425 add_reloc_stub(The_reloc_stub
* stub
, const The_reloc_stub_key
& key
);
1427 // Add an erratum stub into the erratum stub set. The set is ordered by
1428 // (relobj, shndx, sh_offset).
1430 add_erratum_stub(The_erratum_stub
* stub
);
1432 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1434 find_erratum_stub(The_aarch64_relobj
* a64relobj
,
1435 unsigned int shndx
, unsigned int sh_offset
);
1437 // Find all the erratums for a given input section. The return value is a pair
1438 // of iterators [begin, end).
1439 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1440 find_erratum_stubs_for_input_section(The_aarch64_relobj
* a64relobj
,
1441 unsigned int shndx
);
1443 // Compute the erratum stub address.
1445 erratum_stub_address(The_erratum_stub
* stub
) const
1447 AArch64_address r
= align_address(this->address() + this->reloc_stubs_size_
,
1448 The_erratum_stub::STUB_ADDR_ALIGN
);
1449 r
+= stub
->offset();
1453 // Finalize stubs. No-op here, just for completeness.
1458 // Look up a relocation stub using KEY. Return NULL if there is none.
1460 find_reloc_stub(The_reloc_stub_key
& key
)
1462 Reloc_stub_map_const_iter p
= this->reloc_stubs_
.find(key
);
1463 return (p
!= this->reloc_stubs_
.end()) ? p
->second
: NULL
;
1466 // Relocate reloc stubs in this stub table. This does not relocate erratum stubs.
1468 relocate_reloc_stubs(const The_relocate_info
*,
1469 The_target_aarch64
*,
1475 // Relocate an erratum stub.
1477 relocate_erratum_stub(The_erratum_stub
*, unsigned char*);
1479 // Update data size at the end of a relaxation pass. Return true if data size
1480 // is different from that of the previous relaxation pass.
1482 update_data_size_changed_p()
1484 // No addralign changed here.
1485 off_t s
= align_address(this->reloc_stubs_size_
,
1486 The_erratum_stub::STUB_ADDR_ALIGN
)
1487 + this->erratum_stubs_size_
;
1488 bool changed
= (s
!= this->prev_data_size_
);
1489 this->prev_data_size_
= s
;
1494 // Write out section contents.
1496 do_write(Output_file
*);
1498 // Return the required alignment.
1500 do_addralign() const
1502 return std::max(The_reloc_stub::STUB_ADDR_ALIGN
,
1503 The_erratum_stub::STUB_ADDR_ALIGN
);
1506 // Reset address and file offset.
1508 do_reset_address_and_file_offset()
1509 { this->set_current_data_size_for_child(this->prev_data_size_
); }
1511 // Set final data size.
1513 set_final_data_size()
1514 { this->set_data_size(this->current_data_size()); }
1517 // Relocate one reloc stub.
1519 relocate_reloc_stub(The_reloc_stub
*,
1520 const The_relocate_info
*,
1521 The_target_aarch64
*,
1528 // Owner of this stub table.
1529 The_aarch64_input_section
* owner_
;
1530 // The relocation stubs.
1531 Reloc_stub_map reloc_stubs_
;
1532 // The erratum stubs.
1533 Erratum_stub_set erratum_stubs_
;
1534 // Size of reloc stubs.
1535 off_t reloc_stubs_size_
;
1536 // Size of erratum stubs.
1537 off_t erratum_stubs_size_
;
1538 // data size of this in the previous pass.
1539 off_t prev_data_size_
;
1540 }; // End of Stub_table
1543 // Add an erratum stub into the erratum stub set. The set is ordered by
1544 // (relobj, shndx, sh_offset).
1546 template<int size
, bool big_endian
>
1548 Stub_table
<size
, big_endian
>::add_erratum_stub(The_erratum_stub
* stub
)
1550 std::pair
<Erratum_stub_set_iter
, bool> ret
=
1551 this->erratum_stubs_
.insert(stub
);
1552 gold_assert(ret
.second
);
1553 this->erratum_stubs_size_
= align_address(
1554 this->erratum_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1555 stub
->set_offset(this->erratum_stubs_size_
);
1556 this->erratum_stubs_size_
+= stub
->stub_size();
1560 // Find if such erratum exists for given (obj, shndx, sh_offset).
1562 template<int size
, bool big_endian
>
1563 Erratum_stub
<size
, big_endian
>*
1564 Stub_table
<size
, big_endian
>::find_erratum_stub(
1565 The_aarch64_relobj
* a64relobj
, unsigned int shndx
, unsigned int sh_offset
)
1567 // A dummy object used as key to search in the set.
1568 The_erratum_stub
key(a64relobj
, ST_NONE
,
1570 Erratum_stub_set_iter i
= this->erratum_stubs_
.find(&key
);
1571 if (i
!= this->erratum_stubs_
.end())
1573 The_erratum_stub
* stub(*i
);
1574 gold_assert(stub
->erratum_insn() != 0);
1581 // Find all the errata for a given input section. The return value is a pair of
1582 // iterators [begin, end).
1584 template<int size
, bool big_endian
>
1585 std::pair
<typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
,
1586 typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
>
1587 Stub_table
<size
, big_endian
>::find_erratum_stubs_for_input_section(
1588 The_aarch64_relobj
* a64relobj
, unsigned int shndx
)
1590 typedef std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
> Result_pair
;
1591 Erratum_stub_set_iter start
, end
;
1592 The_erratum_stub
low_key(a64relobj
, ST_NONE
, shndx
, 0);
1593 start
= this->erratum_stubs_
.lower_bound(&low_key
);
1594 if (start
== this->erratum_stubs_
.end())
1595 return Result_pair(this->erratum_stubs_
.end(),
1596 this->erratum_stubs_
.end());
1598 while (end
!= this->erratum_stubs_
.end() &&
1599 (*end
)->relobj() == a64relobj
&& (*end
)->shndx() == shndx
)
1601 return Result_pair(start
, end
);
1605 // Add a STUB using KEY. The caller is responsible for avoiding addition
1606 // if a STUB with the same key has already been added.
1608 template<int size
, bool big_endian
>
1610 Stub_table
<size
, big_endian
>::add_reloc_stub(
1611 The_reloc_stub
* stub
, const The_reloc_stub_key
& key
)
1613 gold_assert(stub
->type() == key
.type());
1614 this->reloc_stubs_
[key
] = stub
;
1616 // Assign stub offset early. We can do this because we never remove
1617 // reloc stubs and they are in the beginning of the stub table.
1618 this->reloc_stubs_size_
= align_address(this->reloc_stubs_size_
,
1619 The_reloc_stub::STUB_ADDR_ALIGN
);
1620 stub
->set_offset(this->reloc_stubs_size_
);
1621 this->reloc_stubs_size_
+= stub
->stub_size();
1625 // Relocate an erratum stub.
1627 template<int size
, bool big_endian
>
1629 Stub_table
<size
, big_endian
>::
1630 relocate_erratum_stub(The_erratum_stub
* estub
,
1631 unsigned char* view
)
1633 // Just for convenience.
1634 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1636 gold_assert(!estub
->is_invalidated_erratum_stub());
1637 AArch64_address stub_address
= this->erratum_stub_address(estub
);
1638 // The address of "b" in the stub that is to be "relocated".
1639 AArch64_address stub_b_insn_address
;
1640 // Branch offset that is to be filled in "b" insn.
1642 switch (estub
->type())
1646 // The 1st insn of the erratum could be a relocation spot,
1647 // in this case we need to fix it with
1648 // "(*i)->erratum_insn()".
1649 elfcpp::Swap
<32, big_endian
>::writeval(
1650 view
+ (stub_address
- this->address()),
1651 estub
->erratum_insn());
1652 // For the erratum, the 2nd insn is a b-insn to be patched
1654 stub_b_insn_address
= stub_address
+ 1 * BPI
;
1655 b_offset
= estub
->destination_address() - stub_b_insn_address
;
1656 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1657 view
+ (stub_b_insn_address
- this->address()),
1658 ((unsigned int)(b_offset
)) & 0xfffffff);
1664 estub
->invalidate_erratum_stub();
1668 // Relocate only reloc stubs in this stub table. This does not relocate erratum
1671 template<int size
, bool big_endian
>
1673 Stub_table
<size
, big_endian
>::
1674 relocate_reloc_stubs(const The_relocate_info
* relinfo
,
1675 The_target_aarch64
* target_aarch64
,
1676 Output_section
* output_section
,
1677 unsigned char* view
,
1678 AArch64_address address
,
1679 section_size_type view_size
)
1681 // "view_size" is the total size of the stub_table.
1682 gold_assert(address
== this->address() &&
1683 view_size
== static_cast<section_size_type
>(this->data_size()));
1684 for(Reloc_stub_map_const_iter p
= this->reloc_stubs_
.begin();
1685 p
!= this->reloc_stubs_
.end(); ++p
)
1686 relocate_reloc_stub(p
->second
, relinfo
, target_aarch64
, output_section
,
1687 view
, address
, view_size
);
1691 // Relocate one reloc stub. This is a helper for
1692 // Stub_table::relocate_reloc_stubs().
1694 template<int size
, bool big_endian
>
1696 Stub_table
<size
, big_endian
>::
1697 relocate_reloc_stub(The_reloc_stub
* stub
,
1698 const The_relocate_info
* relinfo
,
1699 The_target_aarch64
* target_aarch64
,
1700 Output_section
* output_section
,
1701 unsigned char* view
,
1702 AArch64_address address
,
1703 section_size_type view_size
)
1705 // "offset" is the offset from the beginning of the stub_table.
1706 section_size_type offset
= stub
->offset();
1707 section_size_type stub_size
= stub
->stub_size();
1708 // "view_size" is the total size of the stub_table.
1709 gold_assert(offset
+ stub_size
<= view_size
);
1711 target_aarch64
->relocate_reloc_stub(stub
, relinfo
, output_section
,
1712 view
+ offset
, address
+ offset
, view_size
);
1716 // Write out the stubs to file.
1718 template<int size
, bool big_endian
>
1720 Stub_table
<size
, big_endian
>::do_write(Output_file
* of
)
1722 off_t offset
= this->offset();
1723 const section_size_type oview_size
=
1724 convert_to_section_size_type(this->data_size());
1725 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1727 // Write relocation stubs.
1728 for (typename
Reloc_stub_map::const_iterator p
= this->reloc_stubs_
.begin();
1729 p
!= this->reloc_stubs_
.end(); ++p
)
1731 The_reloc_stub
* stub
= p
->second
;
1732 AArch64_address address
= this->address() + stub
->offset();
1733 gold_assert(address
==
1734 align_address(address
, The_reloc_stub::STUB_ADDR_ALIGN
));
1735 stub
->write(oview
+ stub
->offset(), stub
->stub_size());
1738 // Write erratum stubs.
1739 unsigned int erratum_stub_start_offset
=
1740 align_address(this->reloc_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1741 for (typename
Erratum_stub_set::iterator p
= this->erratum_stubs_
.begin();
1742 p
!= this->erratum_stubs_
.end(); ++p
)
1744 The_erratum_stub
* stub(*p
);
1745 stub
->write(oview
+ erratum_stub_start_offset
+ stub
->offset(),
1749 of
->write_output_view(this->offset(), oview_size
, oview
);
1753 // AArch64_relobj class.
1755 template<int size
, bool big_endian
>
1756 class AArch64_relobj
: public Sized_relobj_file
<size
, big_endian
>
1759 typedef AArch64_relobj
<size
, big_endian
> This
;
1760 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1761 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1762 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1763 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1764 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1765 typedef typename
The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter
;
1766 typedef std::vector
<The_stub_table
*> Stub_table_list
;
1767 static const AArch64_address invalid_address
=
1768 static_cast<AArch64_address
>(-1);
1770 AArch64_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1771 const typename
elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1772 : Sized_relobj_file
<size
, big_endian
>(name
, input_file
, offset
, ehdr
),
1779 // Return the stub table of the SHNDX-th section if there is one.
1781 stub_table(unsigned int shndx
) const
1783 gold_assert(shndx
< this->stub_tables_
.size());
1784 return this->stub_tables_
[shndx
];
1787 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1789 set_stub_table(unsigned int shndx
, The_stub_table
* stub_table
)
1791 gold_assert(shndx
< this->stub_tables_
.size());
1792 this->stub_tables_
[shndx
] = stub_table
;
1795 // Entrance to errata scanning.
1797 scan_errata(unsigned int shndx
,
1798 const elfcpp::Shdr
<size
, big_endian
>&,
1799 Output_section
*, const Symbol_table
*,
1800 The_target_aarch64
*);
1802 // Scan all relocation sections for stub generation.
1804 scan_sections_for_stubs(The_target_aarch64
*, const Symbol_table
*,
1807 // Whether a section is a scannable text section.
1809 text_section_is_scannable(const elfcpp::Shdr
<size
, big_endian
>&, unsigned int,
1810 const Output_section
*, const Symbol_table
*);
1812 // Convert regular input section with index SHNDX to a relaxed section.
1814 convert_input_section_to_relaxed_section(unsigned shndx
)
1816 // The stubs have relocations and we need to process them after writing
1817 // out the stubs. So relocation now must follow section write.
1818 this->set_section_offset(shndx
, -1ULL);
1819 this->set_relocs_must_follow_section_writes();
1822 // Structure for mapping symbol position.
1823 struct Mapping_symbol_position
1825 Mapping_symbol_position(unsigned int shndx
, AArch64_address offset
):
1826 shndx_(shndx
), offset_(offset
)
1829 // "<" comparator used in ordered_map container.
1831 operator<(const Mapping_symbol_position
& p
) const
1833 return (this->shndx_
< p
.shndx_
1834 || (this->shndx_
== p
.shndx_
&& this->offset_
< p
.offset_
));
1838 unsigned int shndx_
;
1841 AArch64_address offset_
;
1844 typedef std::map
<Mapping_symbol_position
, char> Mapping_symbol_info
;
1847 // Post constructor setup.
1851 // Call parent's setup method.
1852 Sized_relobj_file
<size
, big_endian
>::do_setup();
1854 // Initialize look-up tables.
1855 this->stub_tables_
.resize(this->shnum());
1859 do_relocate_sections(
1860 const Symbol_table
* symtab
, const Layout
* layout
,
1861 const unsigned char* pshdrs
, Output_file
* of
,
1862 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1864 // Count local symbols and (optionally) record mapping info.
1866 do_count_local_symbols(Stringpool_template
<char>*,
1867 Stringpool_template
<char>*);
1870 // Fix all errata in the object, and for each erratum, relocate corresponding
1873 fix_errata_and_relocate_erratum_stubs(
1874 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1876 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1879 try_fix_erratum_843419_optimized(
1880 The_erratum_stub
*, AArch64_address
,
1881 typename Sized_relobj_file
<size
, big_endian
>::View_size
&);
1883 // Whether a section needs to be scanned for relocation stubs.
1885 section_needs_reloc_stub_scanning(const elfcpp::Shdr
<size
, big_endian
>&,
1886 const Relobj::Output_sections
&,
1887 const Symbol_table
*, const unsigned char*);
1889 // List of stub tables.
1890 Stub_table_list stub_tables_
;
1892 // Mapping symbol information sorted by (section index, section_offset).
1893 Mapping_symbol_info mapping_symbol_info_
;
1894 }; // End of AArch64_relobj
1897 // Override to record mapping symbol information.
1898 template<int size
, bool big_endian
>
1900 AArch64_relobj
<size
, big_endian
>::do_count_local_symbols(
1901 Stringpool_template
<char>* pool
, Stringpool_template
<char>* dynpool
)
1903 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(pool
, dynpool
);
1905 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1906 // processing if not fixing erratum.
1907 if (!parameters
->options().fix_cortex_a53_843419()
1908 && !parameters
->options().fix_cortex_a53_835769())
1911 const unsigned int loccount
= this->local_symbol_count();
1915 // Read the symbol table section header.
1916 const unsigned int symtab_shndx
= this->symtab_shndx();
1917 elfcpp::Shdr
<size
, big_endian
>
1918 symtabshdr(this, this->elf_file()->section_header(symtab_shndx
));
1919 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1921 // Read the local symbols.
1922 const int sym_size
=elfcpp::Elf_sizes
<size
>::sym_size
;
1923 gold_assert(loccount
== symtabshdr
.get_sh_info());
1924 off_t locsize
= loccount
* sym_size
;
1925 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1926 locsize
, true, true);
1928 // For mapping symbol processing, we need to read the symbol names.
1929 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
1930 if (strtab_shndx
>= this->shnum())
1932 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
1936 elfcpp::Shdr
<size
, big_endian
>
1937 strtabshdr(this, this->elf_file()->section_header(strtab_shndx
));
1938 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
1940 this->error(_("symbol table name section has wrong type: %u"),
1941 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
1945 const char* pnames
=
1946 reinterpret_cast<const char*>(this->get_view(strtabshdr
.get_sh_offset(),
1947 strtabshdr
.get_sh_size(),
1950 // Skip the first dummy symbol.
1952 typename Sized_relobj_file
<size
, big_endian
>::Local_values
*
1953 plocal_values
= this->local_values();
1954 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1956 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1957 Symbol_value
<size
>& lv((*plocal_values
)[i
]);
1958 AArch64_address input_value
= lv
.input_value();
1960 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1961 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1963 // Mapping symbols could be one of the following 4 forms -
1968 const char* sym_name
= pnames
+ sym
.get_st_name();
1969 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1970 && (sym_name
[2] == '\0' || sym_name
[2] == '.'))
1973 unsigned int input_shndx
=
1974 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1975 gold_assert(is_ordinary
);
1977 Mapping_symbol_position
msp(input_shndx
, input_value
);
1978 // Insert mapping_symbol_info into map whose ordering is defined by
1979 // (shndx, offset_within_section).
1980 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1986 // Fix all errata in the object and for each erratum, we relocate the
1987 // corresponding erratum stub (by calling Stub_table::relocate_erratum_stub).
1989 template<int size
, bool big_endian
>
1991 AArch64_relobj
<size
, big_endian
>::fix_errata_and_relocate_erratum_stubs(
1992 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1994 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1995 unsigned int shnum
= this->shnum();
1996 const Relobj::Output_sections
& out_sections(this->output_sections());
1997 for (unsigned int i
= 1; i
< shnum
; ++i
)
1999 The_stub_table
* stub_table
= this->stub_table(i
);
2002 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
2003 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
2004 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
2005 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2006 pview((*pviews
)[i
]);
2007 AArch64_address view_offset
= 0;
2008 if (pview
.is_input_output_view
)
2010 // In this case, write_sections has not added the output offset to
2011 // the view's address, so we must do so. Currently this only happens
2012 // for a relaxed section.
2013 unsigned int index
= this->adjust_shndx(i
);
2014 const Output_relaxed_input_section
* poris
=
2015 out_sections
[index
]->find_relaxed_input_section(this, index
);
2016 gold_assert(poris
!= NULL
);
2017 view_offset
= poris
->address() - pview
.address
;
2022 The_erratum_stub
* stub
= *p
;
2024 // Double check data before fix.
2025 gold_assert(pview
.address
+ view_offset
+ stub
->sh_offset()
2026 == stub
->erratum_address());
2028 // Update previously recorded erratum insn with relocated
2031 reinterpret_cast<Insntype
*>(
2032 pview
.view
+ view_offset
+ stub
->sh_offset());
2033 Insntype insn_to_fix
= ip
[0];
2034 stub
->update_erratum_insn(insn_to_fix
);
2036 // First try to see if erratum is 843419 and if it can be fixed
2037 // without using branch-to-stub.
2038 if (!try_fix_erratum_843419_optimized(stub
, view_offset
, pview
))
2040 // Replace the erratum insn with a branch-to-stub.
2041 AArch64_address stub_address
=
2042 stub_table
->erratum_stub_address(stub
);
2043 unsigned int b_offset
= stub_address
- stub
->erratum_address();
2044 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
2045 pview
.view
+ view_offset
+ stub
->sh_offset(),
2046 b_offset
& 0xfffffff);
2049 // Erratum fix is done (or skipped), continue to relocate erratum
2050 // stub. Note, when erratum fix is skipped (either because we
2051 // proactively change the code sequence or the code sequence is
2052 // changed by relaxation, etc), we can still safely relocate the
2053 // erratum stub, ignoring the fact the erratum could never be
2055 stub_table
->relocate_erratum_stub(
2057 pview
.view
+ (stub_table
->address() - pview
.address
));
2059 // Next erratum stub.
2066 // This is an optimization for 843419. This erratum requires the sequence begin
2067 // with 'adrp', when final value calculated by adrp fits in adr, we can just
2068 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
2069 // in this case, we do not delete the erratum stub (too late to do so), it is
2070 // merely generated without ever being called.)
2072 template<int size
, bool big_endian
>
2074 AArch64_relobj
<size
, big_endian
>::try_fix_erratum_843419_optimized(
2075 The_erratum_stub
* stub
, AArch64_address view_offset
,
2076 typename Sized_relobj_file
<size
, big_endian
>::View_size
& pview
)
2078 if (stub
->type() != ST_E_843419
)
2081 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2082 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
2083 E843419_stub
<size
, big_endian
>* e843419_stub
=
2084 reinterpret_cast<E843419_stub
<size
, big_endian
>*>(stub
);
2085 AArch64_address pc
=
2086 pview
.address
+ view_offset
+ e843419_stub
->adrp_sh_offset();
2087 unsigned int adrp_offset
= e843419_stub
->adrp_sh_offset ();
2088 Insntype
* adrp_view
=
2089 reinterpret_cast<Insntype
*>(pview
.view
+ view_offset
+ adrp_offset
);
2090 Insntype adrp_insn
= adrp_view
[0];
2092 // If the instruction at adrp_sh_offset is "mrs R, tpidr_el0", it may come
2093 // from IE -> LE relaxation etc. This is a side-effect of TLS relaxation that
2094 // ADRP has been turned into MRS, there is no erratum risk anymore.
2095 // Therefore, we return true to avoid doing unnecessary branch-to-stub.
2096 if (Insn_utilities::is_mrs_tpidr_el0(adrp_insn
))
2099 // If the instruction at adrp_sh_offset is not ADRP and the instruction before
2100 // it is "mrs R, tpidr_el0", it may come from LD -> LE relaxation etc.
2101 // Like the above case, there is no erratum risk any more, we can safely
2103 if (!Insn_utilities::is_adrp(adrp_insn
) && adrp_offset
)
2105 Insntype
* prev_view
=
2106 reinterpret_cast<Insntype
*>(
2107 pview
.view
+ view_offset
+ adrp_offset
- 4);
2108 Insntype prev_insn
= prev_view
[0];
2110 if (Insn_utilities::is_mrs_tpidr_el0(prev_insn
))
2114 /* If we reach here, the first instruction must be ADRP. */
2115 gold_assert(Insn_utilities::is_adrp(adrp_insn
));
2116 // Get adrp 33-bit signed imm value.
2117 int64_t adrp_imm
= Insn_utilities::
2118 aarch64_adrp_decode_imm(adrp_insn
);
2119 // adrp - final value transferred to target register is calculated as:
2120 // PC[11:0] = Zeros(12)
2121 // adrp_dest_value = PC + adrp_imm;
2122 int64_t adrp_dest_value
= (pc
& ~((1 << 12) - 1)) + adrp_imm
;
2123 // adr -final value transferred to target register is calucalted as:
2126 // PC + adr_imm = adrp_dest_value
2128 // adr_imm = adrp_dest_value - PC
2129 int64_t adr_imm
= adrp_dest_value
- pc
;
2130 // Check if imm fits in adr (21-bit signed).
2131 if (-(1 << 20) <= adr_imm
&& adr_imm
< (1 << 20))
2133 // Convert 'adrp' into 'adr'.
2134 Insntype adr_insn
= adrp_insn
& ((1u << 31) - 1);
2135 adr_insn
= Insn_utilities::
2136 aarch64_adr_encode_imm(adr_insn
, adr_imm
);
2137 elfcpp::Swap
<32, big_endian
>::writeval(adrp_view
, adr_insn
);
2144 // Relocate sections.
2146 template<int size
, bool big_endian
>
2148 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
2149 const Symbol_table
* symtab
, const Layout
* layout
,
2150 const unsigned char* pshdrs
, Output_file
* of
,
2151 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
2153 // Relocate the section data.
2154 this->relocate_section_range(symtab
, layout
, pshdrs
, of
, pviews
,
2155 1, this->shnum() - 1);
2157 // We do not generate stubs if doing a relocatable link.
2158 if (parameters
->options().relocatable())
2161 // This part only relocates erratum stubs that belong to input sections of this
2163 if (parameters
->options().fix_cortex_a53_843419()
2164 || parameters
->options().fix_cortex_a53_835769())
2165 this->fix_errata_and_relocate_erratum_stubs(pviews
);
2167 Relocate_info
<size
, big_endian
> relinfo
;
2168 relinfo
.symtab
= symtab
;
2169 relinfo
.layout
= layout
;
2170 relinfo
.object
= this;
2172 // This part relocates all reloc stubs that are contained in stub_tables of
2173 // this object file.
2174 unsigned int shnum
= this->shnum();
2175 The_target_aarch64
* target
= The_target_aarch64::current_target();
2177 for (unsigned int i
= 1; i
< shnum
; ++i
)
2179 The_aarch64_input_section
* aarch64_input_section
=
2180 target
->find_aarch64_input_section(this, i
);
2181 if (aarch64_input_section
!= NULL
2182 && aarch64_input_section
->is_stub_table_owner()
2183 && !aarch64_input_section
->stub_table()->empty())
2185 Output_section
* os
= this->output_section(i
);
2186 gold_assert(os
!= NULL
);
2188 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
2189 relinfo
.reloc_shdr
= NULL
;
2190 relinfo
.data_shndx
= i
;
2191 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
2193 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2194 view_struct
= (*pviews
)[i
];
2195 gold_assert(view_struct
.view
!= NULL
);
2197 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
2198 off_t offset
= stub_table
->address() - view_struct
.address
;
2199 unsigned char* view
= view_struct
.view
+ offset
;
2200 AArch64_address address
= stub_table
->address();
2201 section_size_type view_size
= stub_table
->data_size();
2202 stub_table
->relocate_reloc_stubs(&relinfo
, target
, os
, view
, address
,
2209 // Determine if an input section is scannable for stub processing. SHDR is
2210 // the header of the section and SHNDX is the section index. OS is the output
2211 // section for the input section and SYMTAB is the global symbol table used to
2212 // look up ICF information.
2214 template<int size
, bool big_endian
>
2216 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
2217 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
2218 unsigned int text_shndx
,
2219 const Output_section
* os
,
2220 const Symbol_table
* symtab
)
2222 // Skip any empty sections, unallocated sections or sections whose
2223 // type are not SHT_PROGBITS.
2224 if (text_shdr
.get_sh_size() == 0
2225 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
2226 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2229 // Skip any discarded or ICF'ed sections.
2230 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
2233 // Skip exception frame.
2234 if (strcmp(os
->name(), ".eh_frame") == 0)
2237 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
2238 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2244 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2245 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2247 template<int size
, bool big_endian
>
2249 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2250 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2251 const Relobj::Output_sections
& out_sections
,
2252 const Symbol_table
* symtab
,
2253 const unsigned char* pshdrs
)
2255 unsigned int sh_type
= shdr
.get_sh_type();
2256 if (sh_type
!= elfcpp::SHT_RELA
)
2259 // Ignore empty section.
2260 off_t sh_size
= shdr
.get_sh_size();
2264 // Ignore reloc section with unexpected symbol table. The
2265 // error will be reported in the final link.
2266 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2269 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2270 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2272 // Ignore reloc section with unexpected entsize or uneven size.
2273 // The error will be reported in the final link.
2274 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2277 // Ignore reloc section with bad info. This error will be
2278 // reported in the final link.
2279 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2280 if (text_shndx
>= this->shnum())
2283 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2284 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2285 text_shndx
* shdr_size
);
2286 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2287 out_sections
[text_shndx
], symtab
);
2291 // Scan section SHNDX for erratum 843419 and 835769.
2293 template<int size
, bool big_endian
>
2295 AArch64_relobj
<size
, big_endian
>::scan_errata(
2296 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2297 Output_section
* os
, const Symbol_table
* symtab
,
2298 The_target_aarch64
* target
)
2300 if (shdr
.get_sh_size() == 0
2301 || (shdr
.get_sh_flags() &
2302 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2303 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2306 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2308 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2309 AArch64_address output_address
;
2310 if (output_offset
!= invalid_address
)
2311 output_address
= os
->address() + output_offset
;
2314 const Output_relaxed_input_section
* poris
=
2315 os
->find_relaxed_input_section(this, shndx
);
2317 output_address
= poris
->address();
2320 // Update the addresses in previously generated erratum stubs. Unlike when
2321 // we scan relocations for stubs, if section addresses have changed due to
2322 // other relaxations we are unlikely to scan the same erratum instances
2324 The_stub_table
* stub_table
= this->stub_table(shndx
);
2327 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
2328 ipair(stub_table
->find_erratum_stubs_for_input_section(this, shndx
));
2329 for (Erratum_stub_set_iter p
= ipair
.first
; p
!= ipair
.second
; ++p
)
2330 (*p
)->update_erratum_address(output_address
);
2333 section_size_type input_view_size
= 0;
2334 const unsigned char* input_view
=
2335 this->section_contents(shndx
, &input_view_size
, false);
2337 Mapping_symbol_position
section_start(shndx
, 0);
2338 // Find the first mapping symbol record within section shndx.
2339 typename
Mapping_symbol_info::const_iterator p
=
2340 this->mapping_symbol_info_
.lower_bound(section_start
);
2341 while (p
!= this->mapping_symbol_info_
.end() &&
2342 p
->first
.shndx_
== shndx
)
2344 typename
Mapping_symbol_info::const_iterator prev
= p
;
2346 if (prev
->second
== 'x')
2348 section_size_type span_start
=
2349 convert_to_section_size_type(prev
->first
.offset_
);
2350 section_size_type span_end
;
2351 if (p
!= this->mapping_symbol_info_
.end()
2352 && p
->first
.shndx_
== shndx
)
2353 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2355 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2357 // Here we do not share the scanning code of both errata. For 843419,
2358 // only the last few insns of each page are examined, which is fast,
2359 // whereas, for 835769, every insn pair needs to be checked.
2361 if (parameters
->options().fix_cortex_a53_843419())
2362 target
->scan_erratum_843419_span(
2363 this, shndx
, span_start
, span_end
,
2364 const_cast<unsigned char*>(input_view
), output_address
);
2366 if (parameters
->options().fix_cortex_a53_835769())
2367 target
->scan_erratum_835769_span(
2368 this, shndx
, span_start
, span_end
,
2369 const_cast<unsigned char*>(input_view
), output_address
);
2375 // Scan relocations for stub generation.
2377 template<int size
, bool big_endian
>
2379 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2380 The_target_aarch64
* target
,
2381 const Symbol_table
* symtab
,
2382 const Layout
* layout
)
2384 unsigned int shnum
= this->shnum();
2385 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2387 // Read the section headers.
2388 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2392 // To speed up processing, we set up hash tables for fast lookup of
2393 // input offsets to output addresses.
2394 this->initialize_input_to_output_maps();
2396 const Relobj::Output_sections
& out_sections(this->output_sections());
2398 Relocate_info
<size
, big_endian
> relinfo
;
2399 relinfo
.symtab
= symtab
;
2400 relinfo
.layout
= layout
;
2401 relinfo
.object
= this;
2403 // Do relocation stubs scanning.
2404 const unsigned char* p
= pshdrs
+ shdr_size
;
2405 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2407 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2408 if (parameters
->options().fix_cortex_a53_843419()
2409 || parameters
->options().fix_cortex_a53_835769())
2410 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2411 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2414 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2415 AArch64_address output_offset
=
2416 this->get_output_section_offset(index
);
2417 AArch64_address output_address
;
2418 if (output_offset
!= invalid_address
)
2420 output_address
= out_sections
[index
]->address() + output_offset
;
2424 // Currently this only happens for a relaxed section.
2425 const Output_relaxed_input_section
* poris
=
2426 out_sections
[index
]->find_relaxed_input_section(this, index
);
2427 gold_assert(poris
!= NULL
);
2428 output_address
= poris
->address();
2431 // Get the relocations.
2432 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2436 // Get the section contents.
2437 section_size_type input_view_size
= 0;
2438 const unsigned char* input_view
=
2439 this->section_contents(index
, &input_view_size
, false);
2441 relinfo
.reloc_shndx
= i
;
2442 relinfo
.data_shndx
= index
;
2443 unsigned int sh_type
= shdr
.get_sh_type();
2444 unsigned int reloc_size
;
2445 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2446 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2448 Output_section
* os
= out_sections
[index
];
2449 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2450 shdr
.get_sh_size() / reloc_size
,
2452 output_offset
== invalid_address
,
2453 input_view
, output_address
,
2460 // A class to wrap an ordinary input section containing executable code.
2462 template<int size
, bool big_endian
>
2463 class AArch64_input_section
: public Output_relaxed_input_section
2466 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2468 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2469 : Output_relaxed_input_section(relobj
, shndx
, 1),
2471 original_contents_(NULL
), original_size_(0),
2472 original_addralign_(1)
2475 ~AArch64_input_section()
2476 { delete[] this->original_contents_
; }
2482 // Set the stub_table.
2484 set_stub_table(The_stub_table
* st
)
2485 { this->stub_table_
= st
; }
2487 // Whether this is a stub table owner.
2489 is_stub_table_owner() const
2490 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2492 // Return the original size of the section.
2494 original_size() const
2495 { return this->original_size_
; }
2497 // Return the stub table.
2500 { return stub_table_
; }
2503 // Write out this input section.
2505 do_write(Output_file
*);
2507 // Return required alignment of this.
2509 do_addralign() const
2511 if (this->is_stub_table_owner())
2512 return std::max(this->stub_table_
->addralign(),
2513 static_cast<uint64_t>(this->original_addralign_
));
2515 return this->original_addralign_
;
2518 // Finalize data size.
2520 set_final_data_size();
2522 // Reset address and file offset.
2524 do_reset_address_and_file_offset();
2528 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2529 section_offset_type offset
,
2530 section_offset_type
* poutput
) const
2532 if ((object
== this->relobj())
2533 && (shndx
== this->shndx())
2536 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2546 // Copying is not allowed.
2547 AArch64_input_section(const AArch64_input_section
&);
2548 AArch64_input_section
& operator=(const AArch64_input_section
&);
2550 // The relocation stubs.
2551 The_stub_table
* stub_table_
;
2552 // Original section contents. We have to make a copy here since the file
2553 // containing the original section may not be locked when we need to access
2555 unsigned char* original_contents_
;
2556 // Section size of the original input section.
2557 uint32_t original_size_
;
2558 // Address alignment of the original input section.
2559 uint32_t original_addralign_
;
2560 }; // End of AArch64_input_section
2563 // Finalize data size.
2565 template<int size
, bool big_endian
>
2567 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2569 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2571 if (this->is_stub_table_owner())
2573 this->stub_table_
->finalize_data_size();
2574 off
= align_address(off
, this->stub_table_
->addralign());
2575 off
+= this->stub_table_
->data_size();
2577 this->set_data_size(off
);
2581 // Reset address and file offset.
2583 template<int size
, bool big_endian
>
2585 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2587 // Size of the original input section contents.
2588 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2590 // If this is a stub table owner, account for the stub table size.
2591 if (this->is_stub_table_owner())
2593 The_stub_table
* stub_table
= this->stub_table_
;
2595 // Reset the stub table's address and file offset. The
2596 // current data size for child will be updated after that.
2597 stub_table_
->reset_address_and_file_offset();
2598 off
= align_address(off
, stub_table_
->addralign());
2599 off
+= stub_table
->current_data_size();
2602 this->set_current_data_size(off
);
2606 // Initialize an Arm_input_section.
2608 template<int size
, bool big_endian
>
2610 AArch64_input_section
<size
, big_endian
>::init()
2612 Relobj
* relobj
= this->relobj();
2613 unsigned int shndx
= this->shndx();
2615 // We have to cache original size, alignment and contents to avoid locking
2616 // the original file.
2617 this->original_addralign_
=
2618 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2620 // This is not efficient but we expect only a small number of relaxed
2621 // input sections for stubs.
2622 section_size_type section_size
;
2623 const unsigned char* section_contents
=
2624 relobj
->section_contents(shndx
, §ion_size
, false);
2625 this->original_size_
=
2626 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2628 gold_assert(this->original_contents_
== NULL
);
2629 this->original_contents_
= new unsigned char[section_size
];
2630 memcpy(this->original_contents_
, section_contents
, section_size
);
2632 // We want to make this look like the original input section after
2633 // output sections are finalized.
2634 Output_section
* os
= relobj
->output_section(shndx
);
2635 off_t offset
= relobj
->output_section_offset(shndx
);
2636 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2637 this->set_address(os
->address() + offset
);
2638 this->set_file_offset(os
->offset() + offset
);
2639 this->set_current_data_size(this->original_size_
);
2640 this->finalize_data_size();
2644 // Write data to output file.
2646 template<int size
, bool big_endian
>
2648 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2650 // We have to write out the original section content.
2651 gold_assert(this->original_contents_
!= NULL
);
2652 of
->write(this->offset(), this->original_contents_
,
2653 this->original_size_
);
2655 // If this owns a stub table and it is not empty, write it.
2656 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2657 this->stub_table_
->write(of
);
2661 // Arm output section class. This is defined mainly to add a number of stub
2662 // generation methods.
2664 template<int size
, bool big_endian
>
2665 class AArch64_output_section
: public Output_section
2668 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2669 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2670 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2671 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2674 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2675 elfcpp::Elf_Xword flags
)
2676 : Output_section(name
, type
, flags
)
2679 ~AArch64_output_section() {}
2681 // Group input sections for stub generation.
2683 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2687 typedef Output_section::Input_section Input_section
;
2688 typedef Output_section::Input_section_list Input_section_list
;
2690 // Create a stub group.
2692 create_stub_group(Input_section_list::const_iterator
,
2693 Input_section_list::const_iterator
,
2694 Input_section_list::const_iterator
,
2695 The_target_aarch64
*,
2696 std::vector
<Output_relaxed_input_section
*>&,
2698 }; // End of AArch64_output_section
2701 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2702 // the input section that will be the owner of the stub table.
2704 template<int size
, bool big_endian
> void
2705 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2706 Input_section_list::const_iterator first
,
2707 Input_section_list::const_iterator last
,
2708 Input_section_list::const_iterator owner
,
2709 The_target_aarch64
* target
,
2710 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2713 // Currently we convert ordinary input sections into relaxed sections only
2715 The_aarch64_input_section
* input_section
;
2716 if (owner
->is_relaxed_input_section())
2720 gold_assert(owner
->is_input_section());
2721 // Create a new relaxed input section. We need to lock the original
2723 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2725 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2726 new_relaxed_sections
.push_back(input_section
);
2729 // Create a stub table.
2730 The_stub_table
* stub_table
=
2731 target
->new_stub_table(input_section
);
2733 input_section
->set_stub_table(stub_table
);
2735 Input_section_list::const_iterator p
= first
;
2736 // Look for input sections or relaxed input sections in [first ... last].
2739 if (p
->is_input_section() || p
->is_relaxed_input_section())
2741 // The stub table information for input sections live
2742 // in their objects.
2743 The_aarch64_relobj
* aarch64_relobj
=
2744 static_cast<The_aarch64_relobj
*>(p
->relobj());
2745 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2748 while (p
++ != last
);
2752 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2753 // stub groups. We grow a stub group by adding input section until the size is
2754 // just below GROUP_SIZE. The last input section will be converted into a stub
2755 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2756 // after the stub table, effectively doubling the group size.
2758 // This is similar to the group_sections() function in elf32-arm.c but is
2759 // implemented differently.
2761 template<int size
, bool big_endian
>
2762 void AArch64_output_section
<size
, big_endian
>::group_sections(
2763 section_size_type group_size
,
2764 bool stubs_always_after_branch
,
2765 Target_aarch64
<size
, big_endian
>* target
,
2771 FINDING_STUB_SECTION
,
2775 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2777 State state
= NO_GROUP
;
2778 section_size_type off
= 0;
2779 section_size_type group_begin_offset
= 0;
2780 section_size_type group_end_offset
= 0;
2781 section_size_type stub_table_end_offset
= 0;
2782 Input_section_list::const_iterator group_begin
=
2783 this->input_sections().end();
2784 Input_section_list::const_iterator stub_table
=
2785 this->input_sections().end();
2786 Input_section_list::const_iterator group_end
= this->input_sections().end();
2787 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2788 p
!= this->input_sections().end();
2791 section_size_type section_begin_offset
=
2792 align_address(off
, p
->addralign());
2793 section_size_type section_end_offset
=
2794 section_begin_offset
+ p
->data_size();
2796 // Check to see if we should group the previously seen sections.
2802 case FINDING_STUB_SECTION
:
2803 // Adding this section makes the group larger than GROUP_SIZE.
2804 if (section_end_offset
- group_begin_offset
>= group_size
)
2806 if (stubs_always_after_branch
)
2808 gold_assert(group_end
!= this->input_sections().end());
2809 this->create_stub_group(group_begin
, group_end
, group_end
,
2810 target
, new_relaxed_sections
,
2816 // Input sections up to stub_group_size bytes after the stub
2817 // table can be handled by it too.
2818 state
= HAS_STUB_SECTION
;
2819 stub_table
= group_end
;
2820 stub_table_end_offset
= group_end_offset
;
2825 case HAS_STUB_SECTION
:
2826 // Adding this section makes the post stub-section group larger
2829 // NOT SUPPORTED YET. For completeness only.
2830 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2832 gold_assert(group_end
!= this->input_sections().end());
2833 this->create_stub_group(group_begin
, group_end
, stub_table
,
2834 target
, new_relaxed_sections
, task
);
2843 // If we see an input section and currently there is no group, start
2844 // a new one. Skip any empty sections. We look at the data size
2845 // instead of calling p->relobj()->section_size() to avoid locking.
2846 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2847 && (p
->data_size() != 0))
2849 if (state
== NO_GROUP
)
2851 state
= FINDING_STUB_SECTION
;
2853 group_begin_offset
= section_begin_offset
;
2856 // Keep track of the last input section seen.
2858 group_end_offset
= section_end_offset
;
2861 off
= section_end_offset
;
2864 // Create a stub group for any ungrouped sections.
2865 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2867 gold_assert(group_end
!= this->input_sections().end());
2868 this->create_stub_group(group_begin
, group_end
,
2869 (state
== FINDING_STUB_SECTION
2872 target
, new_relaxed_sections
, task
);
2875 if (!new_relaxed_sections
.empty())
2876 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2878 // Update the section offsets
2879 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2881 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2882 new_relaxed_sections
[i
]->relobj());
2883 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2884 // Tell AArch64_relobj that this input section is converted.
2885 relobj
->convert_input_section_to_relaxed_section(shndx
);
2887 } // End of AArch64_output_section::group_sections
2890 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2893 // The aarch64 target class.
2895 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2896 template<int size
, bool big_endian
>
2897 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2900 typedef Target_aarch64
<size
, big_endian
> This
;
2901 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2903 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2904 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2905 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2906 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2907 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2908 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2909 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2910 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2911 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2912 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2913 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2914 typedef Unordered_map
<Section_id
,
2915 AArch64_input_section
<size
, big_endian
>*,
2916 Section_id_hash
> AArch64_input_section_map
;
2917 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2918 const static int TCB_SIZE
= size
/ 8 * 2;
2920 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2921 : Sized_target
<size
, big_endian
>(info
),
2922 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2923 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2924 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2925 got_mod_index_offset_(-1U),
2926 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2927 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2930 // Scan the relocations to determine unreferenced sections for
2931 // garbage collection.
2933 gc_process_relocs(Symbol_table
* symtab
,
2935 Sized_relobj_file
<size
, big_endian
>* object
,
2936 unsigned int data_shndx
,
2937 unsigned int sh_type
,
2938 const unsigned char* prelocs
,
2940 Output_section
* output_section
,
2941 bool needs_special_offset_handling
,
2942 size_t local_symbol_count
,
2943 const unsigned char* plocal_symbols
);
2945 // Scan the relocations to look for symbol adjustments.
2947 scan_relocs(Symbol_table
* symtab
,
2949 Sized_relobj_file
<size
, big_endian
>* object
,
2950 unsigned int data_shndx
,
2951 unsigned int sh_type
,
2952 const unsigned char* prelocs
,
2954 Output_section
* output_section
,
2955 bool needs_special_offset_handling
,
2956 size_t local_symbol_count
,
2957 const unsigned char* plocal_symbols
);
2959 // Finalize the sections.
2961 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2963 // Return the value to use for a dynamic which requires special
2966 do_dynsym_value(const Symbol
*) const;
2968 // Relocate a section.
2970 relocate_section(const Relocate_info
<size
, big_endian
>*,
2971 unsigned int sh_type
,
2972 const unsigned char* prelocs
,
2974 Output_section
* output_section
,
2975 bool needs_special_offset_handling
,
2976 unsigned char* view
,
2977 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2978 section_size_type view_size
,
2979 const Reloc_symbol_changes
*);
2981 // Scan the relocs during a relocatable link.
2983 scan_relocatable_relocs(Symbol_table
* symtab
,
2985 Sized_relobj_file
<size
, big_endian
>* object
,
2986 unsigned int data_shndx
,
2987 unsigned int sh_type
,
2988 const unsigned char* prelocs
,
2990 Output_section
* output_section
,
2991 bool needs_special_offset_handling
,
2992 size_t local_symbol_count
,
2993 const unsigned char* plocal_symbols
,
2994 Relocatable_relocs
*);
2996 // Scan the relocs for --emit-relocs.
2998 emit_relocs_scan(Symbol_table
* symtab
,
3000 Sized_relobj_file
<size
, big_endian
>* object
,
3001 unsigned int data_shndx
,
3002 unsigned int sh_type
,
3003 const unsigned char* prelocs
,
3005 Output_section
* output_section
,
3006 bool needs_special_offset_handling
,
3007 size_t local_symbol_count
,
3008 const unsigned char* plocal_syms
,
3009 Relocatable_relocs
* rr
);
3011 // Relocate a section during a relocatable link.
3014 const Relocate_info
<size
, big_endian
>*,
3015 unsigned int sh_type
,
3016 const unsigned char* prelocs
,
3018 Output_section
* output_section
,
3019 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
3020 unsigned char* view
,
3021 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
3022 section_size_type view_size
,
3023 unsigned char* reloc_view
,
3024 section_size_type reloc_view_size
);
3026 // Return the symbol index to use for a target specific relocation.
3027 // The only target specific relocation is R_AARCH64_TLSDESC for a
3028 // local symbol, which is an absolute reloc.
3030 do_reloc_symbol_index(void*, unsigned int r_type
) const
3032 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
3036 // Return the addend to use for a target specific relocation.
3038 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
3040 // Return the PLT section.
3042 do_plt_address_for_global(const Symbol
* gsym
) const
3043 { return this->plt_section()->address_for_global(gsym
); }
3046 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
3047 { return this->plt_section()->address_for_local(relobj
, symndx
); }
3049 // This function should be defined in targets that can use relocation
3050 // types to determine (implemented in local_reloc_may_be_function_pointer
3051 // and global_reloc_may_be_function_pointer)
3052 // if a function's pointer is taken. ICF uses this in safe mode to only
3053 // fold those functions whose pointer is defintely not taken.
3055 do_can_check_for_function_pointers() const
3058 // Return the number of entries in the PLT.
3060 plt_entry_count() const;
3062 //Return the offset of the first non-reserved PLT entry.
3064 first_plt_entry_offset() const;
3066 // Return the size of each PLT entry.
3068 plt_entry_size() const;
3070 // Create a stub table.
3072 new_stub_table(The_aarch64_input_section
*);
3074 // Create an aarch64 input section.
3075 The_aarch64_input_section
*
3076 new_aarch64_input_section(Relobj
*, unsigned int);
3078 // Find an aarch64 input section instance for a given OBJ and SHNDX.
3079 The_aarch64_input_section
*
3080 find_aarch64_input_section(Relobj
*, unsigned int) const;
3082 // Return the thread control block size.
3084 tcb_size() const { return This::TCB_SIZE
; }
3086 // Scan a section for stub generation.
3088 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
3089 const unsigned char*, size_t, Output_section
*,
3090 bool, const unsigned char*,
3094 // Scan a relocation section for stub.
3095 template<int sh_type
>
3097 scan_reloc_section_for_stubs(
3098 const The_relocate_info
* relinfo
,
3099 const unsigned char* prelocs
,
3101 Output_section
* output_section
,
3102 bool needs_special_offset_handling
,
3103 const unsigned char* view
,
3104 Address view_address
,
3107 // Relocate a single reloc stub.
3109 relocate_reloc_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
3110 Output_section
*, unsigned char*, Address
,
3113 // Get the default AArch64 target.
3117 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
3118 && parameters
->target().get_size() == size
3119 && parameters
->target().is_big_endian() == big_endian
);
3120 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
3124 // Scan erratum 843419 for a part of a section.
3126 scan_erratum_843419_span(
3127 AArch64_relobj
<size
, big_endian
>*,
3129 const section_size_type
,
3130 const section_size_type
,
3134 // Scan erratum 835769 for a part of a section.
3136 scan_erratum_835769_span(
3137 AArch64_relobj
<size
, big_endian
>*,
3139 const section_size_type
,
3140 const section_size_type
,
3146 do_select_as_default_target()
3148 gold_assert(aarch64_reloc_property_table
== NULL
);
3149 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
3152 // Add a new reloc argument, returning the index in the vector.
3154 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
3157 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
3158 return this->tlsdesc_reloc_info_
.size() - 1;
3161 virtual Output_data_plt_aarch64
<size
, big_endian
>*
3162 do_make_data_plt(Layout
* layout
,
3163 Output_data_got_aarch64
<size
, big_endian
>* got
,
3164 Output_data_space
* got_plt
,
3165 Output_data_space
* got_irelative
)
3167 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
3168 layout
, got
, got_plt
, got_irelative
);
3172 // do_make_elf_object to override the same function in the base class.
3174 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
3175 const elfcpp::Ehdr
<size
, big_endian
>&);
3177 Output_data_plt_aarch64
<size
, big_endian
>*
3178 make_data_plt(Layout
* layout
,
3179 Output_data_got_aarch64
<size
, big_endian
>* got
,
3180 Output_data_space
* got_plt
,
3181 Output_data_space
* got_irelative
)
3183 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
3186 // We only need to generate stubs, and hence perform relaxation if we are
3187 // not doing relocatable linking.
3189 do_may_relax() const
3190 { return !parameters
->options().relocatable(); }
3192 // Relaxation hook. This is where we do stub generation.
3194 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
3197 group_sections(Layout
* layout
,
3198 section_size_type group_size
,
3199 bool stubs_always_after_branch
,
3203 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
3204 const Sized_symbol
<size
>*, unsigned int,
3205 const Symbol_value
<size
>*,
3206 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
3209 // Make an output section.
3211 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
3212 elfcpp::Elf_Xword flags
)
3213 { return new The_aarch64_output_section(name
, type
, flags
); }
3216 // The class which scans relocations.
3221 : issued_non_pic_error_(false)
3225 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3226 Sized_relobj_file
<size
, big_endian
>* object
,
3227 unsigned int data_shndx
,
3228 Output_section
* output_section
,
3229 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3230 const elfcpp::Sym
<size
, big_endian
>& lsym
,
3234 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3235 Sized_relobj_file
<size
, big_endian
>* object
,
3236 unsigned int data_shndx
,
3237 Output_section
* output_section
,
3238 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3242 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3243 Target_aarch64
<size
, big_endian
>* ,
3244 Sized_relobj_file
<size
, big_endian
>* ,
3247 const elfcpp::Rela
<size
, big_endian
>& ,
3248 unsigned int r_type
,
3249 const elfcpp::Sym
<size
, big_endian
>&);
3252 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3253 Target_aarch64
<size
, big_endian
>* ,
3254 Sized_relobj_file
<size
, big_endian
>* ,
3257 const elfcpp::Rela
<size
, big_endian
>& ,
3258 unsigned int r_type
,
3263 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3264 unsigned int r_type
);
3267 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3268 unsigned int r_type
, Symbol
*);
3271 possible_function_pointer_reloc(unsigned int r_type
);
3274 check_non_pic(Relobj
*, unsigned int r_type
);
3277 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3278 unsigned int r_type
);
3280 // Whether we have issued an error about a non-PIC compilation.
3281 bool issued_non_pic_error_
;
3284 // The class which implements relocation.
3289 : skip_call_tls_get_addr_(false)
3295 // Do a relocation. Return false if the caller should not issue
3296 // any warnings about this relocation.
3298 relocate(const Relocate_info
<size
, big_endian
>*, unsigned int,
3299 Target_aarch64
*, Output_section
*, size_t, const unsigned char*,
3300 const Sized_symbol
<size
>*, const Symbol_value
<size
>*,
3301 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3305 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3306 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3307 Target_aarch64
<size
, big_endian
>*,
3309 const elfcpp::Rela
<size
, big_endian
>&,
3310 unsigned int r_type
, const Sized_symbol
<size
>*,
3311 const Symbol_value
<size
>*,
3313 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3315 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3317 const Relocate_info
<size
, big_endian
>*,
3318 Target_aarch64
<size
, big_endian
>*,
3319 const elfcpp::Rela
<size
, big_endian
>&,
3322 const Symbol_value
<size
>*);
3324 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3326 const Relocate_info
<size
, big_endian
>*,
3327 Target_aarch64
<size
, big_endian
>*,
3328 const elfcpp::Rela
<size
, big_endian
>&,
3331 const Symbol_value
<size
>*);
3333 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3335 const Relocate_info
<size
, big_endian
>*,
3336 Target_aarch64
<size
, big_endian
>*,
3337 const elfcpp::Rela
<size
, big_endian
>&,
3340 const Symbol_value
<size
>*);
3342 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3344 const Relocate_info
<size
, big_endian
>*,
3345 Target_aarch64
<size
, big_endian
>*,
3346 const elfcpp::Rela
<size
, big_endian
>&,
3349 const Symbol_value
<size
>*);
3351 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3353 const Relocate_info
<size
, big_endian
>*,
3354 Target_aarch64
<size
, big_endian
>*,
3355 const elfcpp::Rela
<size
, big_endian
>&,
3358 const Symbol_value
<size
>*,
3359 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3360 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3362 bool skip_call_tls_get_addr_
;
3364 }; // End of class Relocate
3366 // Adjust TLS relocation type based on the options and whether this
3367 // is a local symbol.
3368 static tls::Tls_optimization
3369 optimize_tls_reloc(bool is_final
, int r_type
);
3371 // Get the GOT section, creating it if necessary.
3372 Output_data_got_aarch64
<size
, big_endian
>*
3373 got_section(Symbol_table
*, Layout
*);
3375 // Get the GOT PLT section.
3377 got_plt_section() const
3379 gold_assert(this->got_plt_
!= NULL
);
3380 return this->got_plt_
;
3383 // Get the GOT section for TLSDESC entries.
3384 Output_data_got
<size
, big_endian
>*
3385 got_tlsdesc_section() const
3387 gold_assert(this->got_tlsdesc_
!= NULL
);
3388 return this->got_tlsdesc_
;
3391 // Create the PLT section.
3393 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3395 // Create a PLT entry for a global symbol.
3397 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3399 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3401 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3402 Sized_relobj_file
<size
, big_endian
>* relobj
,
3403 unsigned int local_sym_index
);
3405 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3407 define_tls_base_symbol(Symbol_table
*, Layout
*);
3409 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3411 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3413 // Create a GOT entry for the TLS module index.
3415 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3416 Sized_relobj_file
<size
, big_endian
>* object
);
3418 // Get the PLT section.
3419 Output_data_plt_aarch64
<size
, big_endian
>*
3422 gold_assert(this->plt_
!= NULL
);
3426 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3427 // ST_E_843419, we need an additional field for adrp offset.
3428 void create_erratum_stub(
3429 AArch64_relobj
<size
, big_endian
>* relobj
,
3431 section_size_type erratum_insn_offset
,
3432 Address erratum_address
,
3433 typename
Insn_utilities::Insntype erratum_insn
,
3435 unsigned int e843419_adrp_offset
=0);
3437 // Return whether this is a 3-insn erratum sequence.
3438 bool is_erratum_843419_sequence(
3439 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3440 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3441 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3443 // Return whether this is a 835769 sequence.
3444 // (Similarly implemented as in elfnn-aarch64.c.)
3445 bool is_erratum_835769_sequence(
3446 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3447 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3449 // Get the dynamic reloc section, creating it if necessary.
3451 rela_dyn_section(Layout
*);
3453 // Get the section to use for TLSDESC relocations.
3455 rela_tlsdesc_section(Layout
*) const;
3457 // Get the section to use for IRELATIVE relocations.
3459 rela_irelative_section(Layout
*);
3461 // Add a potential copy relocation.
3463 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3464 Sized_relobj_file
<size
, big_endian
>* object
,
3465 unsigned int shndx
, Output_section
* output_section
,
3466 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3468 unsigned int r_type
= elfcpp::elf_r_type
<size
>(reloc
.get_r_info());
3469 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3470 symtab
->get_sized_symbol
<size
>(sym
),
3471 object
, shndx
, output_section
,
3472 r_type
, reloc
.get_r_offset(),
3473 reloc
.get_r_addend(),
3474 this->rela_dyn_section(layout
));
3477 // Information about this specific target which we pass to the
3478 // general Target structure.
3479 static const Target::Target_info aarch64_info
;
3481 // The types of GOT entries needed for this platform.
3482 // These values are exposed to the ABI in an incremental link.
3483 // Do not renumber existing values without changing the version
3484 // number of the .gnu_incremental_inputs section.
3487 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3488 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3489 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3490 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3493 // This type is used as the argument to the target specific
3494 // relocation routines. The only target specific reloc is
3495 // R_AARCh64_TLSDESC against a local symbol.
3498 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3499 unsigned int a_r_sym
)
3500 : object(a_object
), r_sym(a_r_sym
)
3503 // The object in which the local symbol is defined.
3504 Sized_relobj_file
<size
, big_endian
>* object
;
3505 // The local symbol index in the object.
3510 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3512 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3513 // The GOT PLT section.
3514 Output_data_space
* got_plt_
;
3515 // The GOT section for IRELATIVE relocations.
3516 Output_data_space
* got_irelative_
;
3517 // The GOT section for TLSDESC relocations.
3518 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3519 // The _GLOBAL_OFFSET_TABLE_ symbol.
3520 Symbol
* global_offset_table_
;
3521 // The dynamic reloc section.
3522 Reloc_section
* rela_dyn_
;
3523 // The section to use for IRELATIVE relocs.
3524 Reloc_section
* rela_irelative_
;
3525 // Relocs saved to avoid a COPY reloc.
3526 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3527 // Offset of the GOT entry for the TLS module index.
3528 unsigned int got_mod_index_offset_
;
3529 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3530 // specific relocation. Here we store the object and local symbol
3531 // index for the relocation.
3532 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3533 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3534 bool tls_base_symbol_defined_
;
3535 // List of stub_tables
3536 Stub_table_list stub_tables_
;
3537 // Actual stub group size
3538 section_size_type stub_group_size_
;
3539 AArch64_input_section_map aarch64_input_section_map_
;
3540 }; // End of Target_aarch64
3544 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3547 false, // is_big_endian
3548 elfcpp::EM_AARCH64
, // machine_code
3549 false, // has_make_symbol
3550 false, // has_resolve
3551 false, // has_code_fill
3552 false, // is_default_stack_executable
3553 true, // can_icf_inline_merge_sections
3555 "/lib/ld.so.1", // program interpreter
3556 0x400000, // default_text_segment_address
3557 0x10000, // abi_pagesize (overridable by -z max-page-size)
3558 0x1000, // common_pagesize (overridable by -z common-page-size)
3559 false, // isolate_execinstr
3561 elfcpp::SHN_UNDEF
, // small_common_shndx
3562 elfcpp::SHN_UNDEF
, // large_common_shndx
3563 0, // small_common_section_flags
3564 0, // large_common_section_flags
3565 NULL
, // attributes_section
3566 NULL
, // attributes_vendor
3567 "_start", // entry_symbol_name
3568 32, // hash_entry_size
3569 elfcpp::SHT_PROGBITS
, // unwind_section_type
3573 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3576 false, // is_big_endian
3577 elfcpp::EM_AARCH64
, // machine_code
3578 false, // has_make_symbol
3579 false, // has_resolve
3580 false, // has_code_fill
3581 false, // is_default_stack_executable
3582 false, // can_icf_inline_merge_sections
3584 "/lib/ld.so.1", // program interpreter
3585 0x400000, // default_text_segment_address
3586 0x10000, // abi_pagesize (overridable by -z max-page-size)
3587 0x1000, // common_pagesize (overridable by -z common-page-size)
3588 false, // isolate_execinstr
3590 elfcpp::SHN_UNDEF
, // small_common_shndx
3591 elfcpp::SHN_UNDEF
, // large_common_shndx
3592 0, // small_common_section_flags
3593 0, // large_common_section_flags
3594 NULL
, // attributes_section
3595 NULL
, // attributes_vendor
3596 "_start", // entry_symbol_name
3597 32, // hash_entry_size
3598 elfcpp::SHT_PROGBITS
, // unwind_section_type
3602 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3605 true, // is_big_endian
3606 elfcpp::EM_AARCH64
, // machine_code
3607 false, // has_make_symbol
3608 false, // has_resolve
3609 false, // has_code_fill
3610 false, // is_default_stack_executable
3611 true, // can_icf_inline_merge_sections
3613 "/lib/ld.so.1", // program interpreter
3614 0x400000, // default_text_segment_address
3615 0x10000, // abi_pagesize (overridable by -z max-page-size)
3616 0x1000, // common_pagesize (overridable by -z common-page-size)
3617 false, // isolate_execinstr
3619 elfcpp::SHN_UNDEF
, // small_common_shndx
3620 elfcpp::SHN_UNDEF
, // large_common_shndx
3621 0, // small_common_section_flags
3622 0, // large_common_section_flags
3623 NULL
, // attributes_section
3624 NULL
, // attributes_vendor
3625 "_start", // entry_symbol_name
3626 32, // hash_entry_size
3627 elfcpp::SHT_PROGBITS
, // unwind_section_type
3631 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3634 true, // is_big_endian
3635 elfcpp::EM_AARCH64
, // machine_code
3636 false, // has_make_symbol
3637 false, // has_resolve
3638 false, // has_code_fill
3639 false, // is_default_stack_executable
3640 false, // can_icf_inline_merge_sections
3642 "/lib/ld.so.1", // program interpreter
3643 0x400000, // default_text_segment_address
3644 0x10000, // abi_pagesize (overridable by -z max-page-size)
3645 0x1000, // common_pagesize (overridable by -z common-page-size)
3646 false, // isolate_execinstr
3648 elfcpp::SHN_UNDEF
, // small_common_shndx
3649 elfcpp::SHN_UNDEF
, // large_common_shndx
3650 0, // small_common_section_flags
3651 0, // large_common_section_flags
3652 NULL
, // attributes_section
3653 NULL
, // attributes_vendor
3654 "_start", // entry_symbol_name
3655 32, // hash_entry_size
3656 elfcpp::SHT_PROGBITS
, // unwind_section_type
3659 // Get the GOT section, creating it if necessary.
3661 template<int size
, bool big_endian
>
3662 Output_data_got_aarch64
<size
, big_endian
>*
3663 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3666 if (this->got_
== NULL
)
3668 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3670 // When using -z now, we can treat .got.plt as a relro section.
3671 // Without -z now, it is modified after program startup by lazy
3673 bool is_got_plt_relro
= parameters
->options().now();
3674 Output_section_order got_order
= (is_got_plt_relro
3676 : ORDER_RELRO_LAST
);
3677 Output_section_order got_plt_order
= (is_got_plt_relro
3679 : ORDER_NON_RELRO_FIRST
);
3681 // Layout of .got and .got.plt sections.
3682 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3684 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3685 // .gotplt[1] reserved for ld.so (resolver)
3686 // .gotplt[2] reserved
3688 // Generate .got section.
3689 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3691 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3692 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3693 this->got_
, got_order
, true);
3694 // The first word of GOT is reserved for the address of .dynamic.
3695 // We put 0 here now. The value will be replaced later in
3696 // Output_data_got_aarch64::do_write.
3697 this->got_
->add_constant(0);
3699 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3700 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3701 // even if there is a .got.plt section.
3702 this->global_offset_table_
=
3703 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3704 Symbol_table::PREDEFINED
,
3706 0, 0, elfcpp::STT_OBJECT
,
3708 elfcpp::STV_HIDDEN
, 0,
3711 // Generate .got.plt section.
3712 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3713 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3715 | elfcpp::SHF_WRITE
),
3716 this->got_plt_
, got_plt_order
,
3719 // The first three entries are reserved.
3720 this->got_plt_
->set_current_data_size(
3721 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3723 // If there are any IRELATIVE relocations, they get GOT entries
3724 // in .got.plt after the jump slot entries.
3725 this->got_irelative_
= new Output_data_space(size
/ 8,
3726 "** GOT IRELATIVE PLT");
3727 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3729 | elfcpp::SHF_WRITE
),
3730 this->got_irelative_
,
3734 // If there are any TLSDESC relocations, they get GOT entries in
3735 // .got.plt after the jump slot and IRELATIVE entries.
3736 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3737 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3739 | elfcpp::SHF_WRITE
),
3744 if (!is_got_plt_relro
)
3746 // Those bytes can go into the relro segment.
3747 layout
->increase_relro(
3748 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3755 // Get the dynamic reloc section, creating it if necessary.
3757 template<int size
, bool big_endian
>
3758 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3759 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3761 if (this->rela_dyn_
== NULL
)
3763 gold_assert(layout
!= NULL
);
3764 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3765 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3766 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3767 ORDER_DYNAMIC_RELOCS
, false);
3769 return this->rela_dyn_
;
3772 // Get the section to use for IRELATIVE relocs, creating it if
3773 // necessary. These go in .rela.dyn, but only after all other dynamic
3774 // relocations. They need to follow the other dynamic relocations so
3775 // that they can refer to global variables initialized by those
3778 template<int size
, bool big_endian
>
3779 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3780 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3782 if (this->rela_irelative_
== NULL
)
3784 // Make sure we have already created the dynamic reloc section.
3785 this->rela_dyn_section(layout
);
3786 this->rela_irelative_
= new Reloc_section(false);
3787 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3788 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3789 ORDER_DYNAMIC_RELOCS
, false);
3790 gold_assert(this->rela_dyn_
->output_section()
3791 == this->rela_irelative_
->output_section());
3793 return this->rela_irelative_
;
3797 // do_make_elf_object to override the same function in the base class. We need
3798 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3799 // store backend specific information. Hence we need to have our own ELF object
3802 template<int size
, bool big_endian
>
3804 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3805 const std::string
& name
,
3806 Input_file
* input_file
,
3807 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3809 int et
= ehdr
.get_e_type();
3810 // ET_EXEC files are valid input for --just-symbols/-R,
3811 // and we treat them as relocatable objects.
3812 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3813 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3814 name
, input_file
, offset
, ehdr
);
3815 else if (et
== elfcpp::ET_REL
)
3817 AArch64_relobj
<size
, big_endian
>* obj
=
3818 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3822 else if (et
== elfcpp::ET_DYN
)
3824 // Keep base implementation.
3825 Sized_dynobj
<size
, big_endian
>* obj
=
3826 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3832 gold_error(_("%s: unsupported ELF file type %d"),
3839 // Scan a relocation for stub generation.
3841 template<int size
, bool big_endian
>
3843 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3844 const Relocate_info
<size
, big_endian
>* relinfo
,
3845 unsigned int r_type
,
3846 const Sized_symbol
<size
>* gsym
,
3848 const Symbol_value
<size
>* psymval
,
3849 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3852 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3853 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3855 Symbol_value
<size
> symval
;
3858 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3859 get_reloc_property(r_type
);
3860 if (gsym
->use_plt_offset(arp
->reference_flags()))
3862 // This uses a PLT, change the symbol value.
3863 symval
.set_output_value(this->plt_address_for_global(gsym
));
3866 else if (gsym
->is_undefined())
3868 // There is no need to generate a stub symbol if the original symbol
3870 gold_debug(DEBUG_TARGET
,
3871 "stub: not creating a stub for undefined symbol %s in file %s",
3872 gsym
->name(), aarch64_relobj
->name().c_str());
3877 // Get the symbol value.
3878 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3880 // Owing to pipelining, the PC relative branches below actually skip
3881 // two instructions when the branch offset is 0.
3882 Address destination
= static_cast<Address
>(-1);
3885 case elfcpp::R_AARCH64_CALL26
:
3886 case elfcpp::R_AARCH64_JUMP26
:
3887 destination
= value
+ addend
;
3893 int stub_type
= The_reloc_stub::
3894 stub_type_for_reloc(r_type
, address
, destination
);
3895 if (stub_type
== ST_NONE
)
3898 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3899 gold_assert(stub_table
!= NULL
);
3901 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3902 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3905 stub
= new The_reloc_stub(stub_type
);
3906 stub_table
->add_reloc_stub(stub
, key
);
3908 stub
->set_destination_address(destination
);
3909 } // End of Target_aarch64::scan_reloc_for_stub
3912 // This function scans a relocation section for stub generation.
3913 // The template parameter Relocate must be a class type which provides
3914 // a single function, relocate(), which implements the machine
3915 // specific part of a relocation.
3917 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3918 // SHT_REL or SHT_RELA.
3920 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3921 // of relocs. OUTPUT_SECTION is the output section.
3922 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3923 // mapped to output offsets.
3925 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3926 // VIEW_SIZE is the size. These refer to the input section, unless
3927 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3928 // the output section.
3930 template<int size
, bool big_endian
>
3931 template<int sh_type
>
3933 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3934 const Relocate_info
<size
, big_endian
>* relinfo
,
3935 const unsigned char* prelocs
,
3937 Output_section
* /*output_section*/,
3938 bool /*needs_special_offset_handling*/,
3939 const unsigned char* /*view*/,
3940 Address view_address
,
3943 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3945 const int reloc_size
=
3946 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3947 AArch64_relobj
<size
, big_endian
>* object
=
3948 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3949 unsigned int local_count
= object
->local_symbol_count();
3951 gold::Default_comdat_behavior default_comdat_behavior
;
3952 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3954 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3956 Reltype
reloc(prelocs
);
3957 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3958 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3959 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3960 if (r_type
!= elfcpp::R_AARCH64_CALL26
3961 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3964 section_offset_type offset
=
3965 convert_to_section_size_type(reloc
.get_r_offset());
3968 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3969 reloc
.get_r_addend();
3971 const Sized_symbol
<size
>* sym
;
3972 Symbol_value
<size
> symval
;
3973 const Symbol_value
<size
> *psymval
;
3974 bool is_defined_in_discarded_section
;
3976 const Symbol
* gsym
= NULL
;
3977 if (r_sym
< local_count
)
3980 psymval
= object
->local_symbol(r_sym
);
3982 // If the local symbol belongs to a section we are discarding,
3983 // and that section is a debug section, try to find the
3984 // corresponding kept section and map this symbol to its
3985 // counterpart in the kept section. The symbol must not
3986 // correspond to a section we are folding.
3988 shndx
= psymval
->input_shndx(&is_ordinary
);
3989 is_defined_in_discarded_section
=
3991 && shndx
!= elfcpp::SHN_UNDEF
3992 && !object
->is_section_included(shndx
)
3993 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3995 // We need to compute the would-be final value of this local
3997 if (!is_defined_in_discarded_section
)
3999 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
4000 if (psymval
->is_section_symbol())
4001 symval
.set_is_section_symbol();
4002 typename
ObjType::Compute_final_local_value_status status
=
4003 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
4005 if (status
== ObjType::CFLV_OK
)
4007 // Currently we cannot handle a branch to a target in
4008 // a merged section. If this is the case, issue an error
4009 // and also free the merge symbol value.
4010 if (!symval
.has_output_value())
4012 const std::string
& section_name
=
4013 object
->section_name(shndx
);
4014 object
->error(_("cannot handle branch to local %u "
4015 "in a merged section %s"),
4016 r_sym
, section_name
.c_str());
4022 // We cannot determine the final value.
4029 gsym
= object
->global_symbol(r_sym
);
4030 gold_assert(gsym
!= NULL
);
4031 if (gsym
->is_forwarder())
4032 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
4034 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
4035 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
4036 symval
.set_output_symtab_index(sym
->symtab_index());
4038 symval
.set_no_output_symtab_entry();
4040 // We need to compute the would-be final value of this global
4042 const Symbol_table
* symtab
= relinfo
->symtab
;
4043 const Sized_symbol
<size
>* sized_symbol
=
4044 symtab
->get_sized_symbol
<size
>(gsym
);
4045 Symbol_table::Compute_final_value_status status
;
4046 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4047 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
4049 // Skip this if the symbol has not output section.
4050 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
4052 symval
.set_output_value(value
);
4054 if (gsym
->type() == elfcpp::STT_TLS
)
4055 symval
.set_is_tls_symbol();
4056 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
4057 symval
.set_is_ifunc_symbol();
4060 is_defined_in_discarded_section
=
4061 (gsym
->is_defined_in_discarded_section()
4062 && gsym
->is_undefined());
4066 Symbol_value
<size
> symval2
;
4067 if (is_defined_in_discarded_section
)
4069 std::string name
= object
->section_name(relinfo
->data_shndx
);
4071 if (comdat_behavior
== CB_UNDETERMINED
)
4072 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
4074 if (comdat_behavior
== CB_PRETEND
)
4077 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4078 object
->map_to_kept_section(shndx
, name
, &found
);
4080 symval2
.set_output_value(value
+ psymval
->input_value());
4082 symval2
.set_output_value(0);
4086 if (comdat_behavior
== CB_ERROR
)
4087 issue_discarded_error(relinfo
, i
, offset
, r_sym
, gsym
);
4088 symval2
.set_output_value(0);
4090 symval2
.set_no_output_symtab_entry();
4094 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
4095 addend
, view_address
+ offset
);
4096 } // End of iterating relocs in a section
4097 } // End of Target_aarch64::scan_reloc_section_for_stubs
4100 // Scan an input section for stub generation.
4102 template<int size
, bool big_endian
>
4104 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
4105 const Relocate_info
<size
, big_endian
>* relinfo
,
4106 unsigned int sh_type
,
4107 const unsigned char* prelocs
,
4109 Output_section
* output_section
,
4110 bool needs_special_offset_handling
,
4111 const unsigned char* view
,
4112 Address view_address
,
4113 section_size_type view_size
)
4115 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4116 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
4121 needs_special_offset_handling
,
4128 // Relocate a single reloc stub.
4130 template<int size
, bool big_endian
>
4131 void Target_aarch64
<size
, big_endian
>::
4132 relocate_reloc_stub(The_reloc_stub
* stub
,
4133 const The_relocate_info
*,
4135 unsigned char* view
,
4139 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
4140 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
4141 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
4143 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
4144 int insn_number
= stub
->insn_num();
4145 const uint32_t* insns
= stub
->insns();
4146 // Check the insns are really those stub insns.
4147 for (int i
= 0; i
< insn_number
; ++i
)
4149 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
4150 gold_assert(((uint32_t)insn
== insns
[i
]));
4153 Address dest
= stub
->destination_address();
4155 switch(stub
->type())
4157 case ST_ADRP_BRANCH
:
4159 // 1st reloc is ADR_PREL_PG_HI21
4160 The_reloc_functions_status status
=
4161 The_reloc_functions::adrp(view
, dest
, address
);
4162 // An error should never arise in the above step. If so, please
4163 // check 'aarch64_valid_for_adrp_p'.
4164 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4166 // 2nd reloc is ADD_ABS_LO12_NC
4167 const AArch64_reloc_property
* arp
=
4168 aarch64_reloc_property_table
->get_reloc_property(
4169 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
4170 gold_assert(arp
!= NULL
);
4171 status
= The_reloc_functions::template
4172 rela_general
<32>(view
+ 4, dest
, 0, arp
);
4173 // An error should never arise, it is an "_NC" relocation.
4174 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4178 case ST_LONG_BRANCH_ABS
:
4179 // 1st reloc is R_AARCH64_PREL64, at offset 8
4180 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
4183 case ST_LONG_BRANCH_PCREL
:
4185 // "PC" calculation is the 2nd insn in the stub.
4186 uint64_t offset
= dest
- (address
+ 4);
4187 // Offset is placed at offset 4 and 5.
4188 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
4198 // A class to handle the PLT data.
4199 // This is an abstract base class that handles most of the linker details
4200 // but does not know the actual contents of PLT entries. The derived
4201 // classes below fill in those details.
4203 template<int size
, bool big_endian
>
4204 class Output_data_plt_aarch64
: public Output_section_data
4207 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
4209 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4211 Output_data_plt_aarch64(Layout
* layout
,
4213 Output_data_got_aarch64
<size
, big_endian
>* got
,
4214 Output_data_space
* got_plt
,
4215 Output_data_space
* got_irelative
)
4216 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
4217 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
4218 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4219 { this->init(layout
); }
4221 // Initialize the PLT section.
4223 init(Layout
* layout
);
4225 // Add an entry to the PLT.
4227 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
4229 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4231 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
4232 Sized_relobj_file
<size
, big_endian
>* relobj
,
4233 unsigned int local_sym_index
);
4235 // Add the relocation for a PLT entry.
4237 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
4238 unsigned int got_offset
);
4240 // Add the reserved TLSDESC_PLT entry to the PLT.
4242 reserve_tlsdesc_entry(unsigned int got_offset
)
4243 { this->tlsdesc_got_offset_
= got_offset
; }
4245 // Return true if a TLSDESC_PLT entry has been reserved.
4247 has_tlsdesc_entry() const
4248 { return this->tlsdesc_got_offset_
!= -1U; }
4250 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4252 get_tlsdesc_got_offset() const
4253 { return this->tlsdesc_got_offset_
; }
4255 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4257 get_tlsdesc_plt_offset() const
4259 return (this->first_plt_entry_offset() +
4260 (this->count_
+ this->irelative_count_
)
4261 * this->get_plt_entry_size());
4264 // Return the .rela.plt section data.
4267 { return this->rel_
; }
4269 // Return where the TLSDESC relocations should go.
4271 rela_tlsdesc(Layout
*);
4273 // Return where the IRELATIVE relocations should go in the PLT
4276 rela_irelative(Symbol_table
*, Layout
*);
4278 // Return whether we created a section for IRELATIVE relocations.
4280 has_irelative_section() const
4281 { return this->irelative_rel_
!= NULL
; }
4283 // Return the number of PLT entries.
4286 { return this->count_
+ this->irelative_count_
; }
4288 // Return the offset of the first non-reserved PLT entry.
4290 first_plt_entry_offset() const
4291 { return this->do_first_plt_entry_offset(); }
4293 // Return the size of a PLT entry.
4295 get_plt_entry_size() const
4296 { return this->do_get_plt_entry_size(); }
4298 // Return the reserved tlsdesc entry size.
4300 get_plt_tlsdesc_entry_size() const
4301 { return this->do_get_plt_tlsdesc_entry_size(); }
4303 // Return the PLT address to use for a global symbol.
4305 address_for_global(const Symbol
*);
4307 // Return the PLT address to use for a local symbol.
4309 address_for_local(const Relobj
*, unsigned int symndx
);
4312 // Fill in the first PLT entry.
4314 fill_first_plt_entry(unsigned char* pov
,
4315 Address got_address
,
4316 Address plt_address
)
4317 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4319 // Fill in a normal PLT entry.
4321 fill_plt_entry(unsigned char* pov
,
4322 Address got_address
,
4323 Address plt_address
,
4324 unsigned int got_offset
,
4325 unsigned int plt_offset
)
4327 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4328 got_offset
, plt_offset
);
4331 // Fill in the reserved TLSDESC PLT entry.
4333 fill_tlsdesc_entry(unsigned char* pov
,
4334 Address gotplt_address
,
4335 Address plt_address
,
4337 unsigned int tlsdesc_got_offset
,
4338 unsigned int plt_offset
)
4340 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4341 tlsdesc_got_offset
, plt_offset
);
4344 virtual unsigned int
4345 do_first_plt_entry_offset() const = 0;
4347 virtual unsigned int
4348 do_get_plt_entry_size() const = 0;
4350 virtual unsigned int
4351 do_get_plt_tlsdesc_entry_size() const = 0;
4354 do_fill_first_plt_entry(unsigned char* pov
,
4356 Address plt_addr
) = 0;
4359 do_fill_plt_entry(unsigned char* pov
,
4360 Address got_address
,
4361 Address plt_address
,
4362 unsigned int got_offset
,
4363 unsigned int plt_offset
) = 0;
4366 do_fill_tlsdesc_entry(unsigned char* pov
,
4367 Address gotplt_address
,
4368 Address plt_address
,
4370 unsigned int tlsdesc_got_offset
,
4371 unsigned int plt_offset
) = 0;
4374 do_adjust_output_section(Output_section
* os
);
4376 // Write to a map file.
4378 do_print_to_mapfile(Mapfile
* mapfile
) const
4379 { mapfile
->print_output_data(this, _("** PLT")); }
4382 // Set the final size.
4384 set_final_data_size();
4386 // Write out the PLT data.
4388 do_write(Output_file
*);
4390 // The reloc section.
4391 Reloc_section
* rel_
;
4393 // The TLSDESC relocs, if necessary. These must follow the regular
4395 Reloc_section
* tlsdesc_rel_
;
4397 // The IRELATIVE relocs, if necessary. These must follow the
4398 // regular PLT relocations.
4399 Reloc_section
* irelative_rel_
;
4401 // The .got section.
4402 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4404 // The .got.plt section.
4405 Output_data_space
* got_plt_
;
4407 // The part of the .got.plt section used for IRELATIVE relocs.
4408 Output_data_space
* got_irelative_
;
4410 // The number of PLT entries.
4411 unsigned int count_
;
4413 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4414 // follow the regular PLT entries.
4415 unsigned int irelative_count_
;
4417 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4418 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4419 // indicates an offset is not allocated.
4420 unsigned int tlsdesc_got_offset_
;
4423 // Initialize the PLT section.
4425 template<int size
, bool big_endian
>
4427 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4429 this->rel_
= new Reloc_section(false);
4430 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4431 elfcpp::SHF_ALLOC
, this->rel_
,
4432 ORDER_DYNAMIC_PLT_RELOCS
, false);
4435 template<int size
, bool big_endian
>
4437 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4440 os
->set_entsize(this->get_plt_entry_size());
4443 // Add an entry to the PLT.
4445 template<int size
, bool big_endian
>
4447 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4448 Layout
* layout
, Symbol
* gsym
)
4450 gold_assert(!gsym
->has_plt_offset());
4452 unsigned int* pcount
;
4453 unsigned int plt_reserved
;
4454 Output_section_data_build
* got
;
4456 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4457 && gsym
->can_use_relative_reloc(false))
4459 pcount
= &this->irelative_count_
;
4461 got
= this->got_irelative_
;
4465 pcount
= &this->count_
;
4466 plt_reserved
= this->first_plt_entry_offset();
4467 got
= this->got_plt_
;
4470 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4475 section_offset_type got_offset
= got
->current_data_size();
4477 // Every PLT entry needs a GOT entry which points back to the PLT
4478 // entry (this will be changed by the dynamic linker, normally
4479 // lazily when the function is called).
4480 got
->set_current_data_size(got_offset
+ size
/ 8);
4482 // Every PLT entry needs a reloc.
4483 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4485 // Note that we don't need to save the symbol. The contents of the
4486 // PLT are independent of which symbols are used. The symbols only
4487 // appear in the relocations.
4490 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4493 template<int size
, bool big_endian
>
4495 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4496 Symbol_table
* symtab
,
4498 Sized_relobj_file
<size
, big_endian
>* relobj
,
4499 unsigned int local_sym_index
)
4501 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4502 ++this->irelative_count_
;
4504 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4506 // Every PLT entry needs a GOT entry which points back to the PLT
4508 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4510 // Every PLT entry needs a reloc.
4511 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4512 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4513 elfcpp::R_AARCH64_IRELATIVE
,
4514 this->got_irelative_
, got_offset
, 0);
4519 // Add the relocation for a PLT entry.
4521 template<int size
, bool big_endian
>
4523 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4524 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4526 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4527 && gsym
->can_use_relative_reloc(false))
4529 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4530 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4531 this->got_irelative_
, got_offset
, 0);
4535 gsym
->set_needs_dynsym_entry();
4536 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4541 // Return where the TLSDESC relocations should go, creating it if
4542 // necessary. These follow the JUMP_SLOT relocations.
4544 template<int size
, bool big_endian
>
4545 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4546 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4548 if (this->tlsdesc_rel_
== NULL
)
4550 this->tlsdesc_rel_
= new Reloc_section(false);
4551 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4552 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4553 ORDER_DYNAMIC_PLT_RELOCS
, false);
4554 gold_assert(this->tlsdesc_rel_
->output_section()
4555 == this->rel_
->output_section());
4557 return this->tlsdesc_rel_
;
4560 // Return where the IRELATIVE relocations should go in the PLT. These
4561 // follow the JUMP_SLOT and the TLSDESC relocations.
4563 template<int size
, bool big_endian
>
4564 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4565 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4568 if (this->irelative_rel_
== NULL
)
4570 // Make sure we have a place for the TLSDESC relocations, in
4571 // case we see any later on.
4572 this->rela_tlsdesc(layout
);
4573 this->irelative_rel_
= new Reloc_section(false);
4574 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4575 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4576 ORDER_DYNAMIC_PLT_RELOCS
, false);
4577 gold_assert(this->irelative_rel_
->output_section()
4578 == this->rel_
->output_section());
4580 if (parameters
->doing_static_link())
4582 // A statically linked executable will only have a .rela.plt
4583 // section to hold R_AARCH64_IRELATIVE relocs for
4584 // STT_GNU_IFUNC symbols. The library will use these
4585 // symbols to locate the IRELATIVE relocs at program startup
4587 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4588 Symbol_table::PREDEFINED
,
4589 this->irelative_rel_
, 0, 0,
4590 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4591 elfcpp::STV_HIDDEN
, 0, false, true);
4592 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4593 Symbol_table::PREDEFINED
,
4594 this->irelative_rel_
, 0, 0,
4595 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4596 elfcpp::STV_HIDDEN
, 0, true, true);
4599 return this->irelative_rel_
;
4602 // Return the PLT address to use for a global symbol.
4604 template<int size
, bool big_endian
>
4606 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4609 uint64_t offset
= 0;
4610 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4611 && gsym
->can_use_relative_reloc(false))
4612 offset
= (this->first_plt_entry_offset() +
4613 this->count_
* this->get_plt_entry_size());
4614 return this->address() + offset
+ gsym
->plt_offset();
4617 // Return the PLT address to use for a local symbol. These are always
4618 // IRELATIVE relocs.
4620 template<int size
, bool big_endian
>
4622 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4623 const Relobj
* object
,
4626 return (this->address()
4627 + this->first_plt_entry_offset()
4628 + this->count_
* this->get_plt_entry_size()
4629 + object
->local_plt_offset(r_sym
));
4632 // Set the final size.
4634 template<int size
, bool big_endian
>
4636 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4638 unsigned int count
= this->count_
+ this->irelative_count_
;
4639 unsigned int extra_size
= 0;
4640 if (this->has_tlsdesc_entry())
4641 extra_size
+= this->get_plt_tlsdesc_entry_size();
4642 this->set_data_size(this->first_plt_entry_offset()
4643 + count
* this->get_plt_entry_size()
4647 template<int size
, bool big_endian
>
4648 class Output_data_plt_aarch64_standard
:
4649 public Output_data_plt_aarch64
<size
, big_endian
>
4652 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4653 Output_data_plt_aarch64_standard(
4655 Output_data_got_aarch64
<size
, big_endian
>* got
,
4656 Output_data_space
* got_plt
,
4657 Output_data_space
* got_irelative
)
4658 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4665 // Return the offset of the first non-reserved PLT entry.
4666 virtual unsigned int
4667 do_first_plt_entry_offset() const
4668 { return this->first_plt_entry_size
; }
4670 // Return the size of a PLT entry
4671 virtual unsigned int
4672 do_get_plt_entry_size() const
4673 { return this->plt_entry_size
; }
4675 // Return the size of a tlsdesc entry
4676 virtual unsigned int
4677 do_get_plt_tlsdesc_entry_size() const
4678 { return this->plt_tlsdesc_entry_size
; }
4681 do_fill_first_plt_entry(unsigned char* pov
,
4682 Address got_address
,
4683 Address plt_address
);
4686 do_fill_plt_entry(unsigned char* pov
,
4687 Address got_address
,
4688 Address plt_address
,
4689 unsigned int got_offset
,
4690 unsigned int plt_offset
);
4693 do_fill_tlsdesc_entry(unsigned char* pov
,
4694 Address gotplt_address
,
4695 Address plt_address
,
4697 unsigned int tlsdesc_got_offset
,
4698 unsigned int plt_offset
);
4701 // The size of the first plt entry size.
4702 static const int first_plt_entry_size
= 32;
4703 // The size of the plt entry size.
4704 static const int plt_entry_size
= 16;
4705 // The size of the plt tlsdesc entry size.
4706 static const int plt_tlsdesc_entry_size
= 32;
4707 // Template for the first PLT entry.
4708 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4709 // Template for subsequent PLT entries.
4710 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4711 // The reserved TLSDESC entry in the PLT for an executable.
4712 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4715 // The first entry in the PLT for an executable.
4719 Output_data_plt_aarch64_standard
<32, false>::
4720 first_plt_entry
[first_plt_entry_size
/ 4] =
4722 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4723 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4724 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4725 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4726 0xd61f0220, /* br x17 */
4727 0xd503201f, /* nop */
4728 0xd503201f, /* nop */
4729 0xd503201f, /* nop */
4735 Output_data_plt_aarch64_standard
<32, true>::
4736 first_plt_entry
[first_plt_entry_size
/ 4] =
4738 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4739 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4740 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4741 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4742 0xd61f0220, /* br x17 */
4743 0xd503201f, /* nop */
4744 0xd503201f, /* nop */
4745 0xd503201f, /* nop */
4751 Output_data_plt_aarch64_standard
<64, false>::
4752 first_plt_entry
[first_plt_entry_size
/ 4] =
4754 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4755 0x90000010, /* adrp x16, PLT_GOT+16 */
4756 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4757 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4758 0xd61f0220, /* br x17 */
4759 0xd503201f, /* nop */
4760 0xd503201f, /* nop */
4761 0xd503201f, /* nop */
4767 Output_data_plt_aarch64_standard
<64, true>::
4768 first_plt_entry
[first_plt_entry_size
/ 4] =
4770 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4771 0x90000010, /* adrp x16, PLT_GOT+16 */
4772 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4773 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4774 0xd61f0220, /* br x17 */
4775 0xd503201f, /* nop */
4776 0xd503201f, /* nop */
4777 0xd503201f, /* nop */
4783 Output_data_plt_aarch64_standard
<32, false>::
4784 plt_entry
[plt_entry_size
/ 4] =
4786 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4787 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4788 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4789 0xd61f0220, /* br x17. */
4795 Output_data_plt_aarch64_standard
<32, true>::
4796 plt_entry
[plt_entry_size
/ 4] =
4798 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4799 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4800 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4801 0xd61f0220, /* br x17. */
4807 Output_data_plt_aarch64_standard
<64, false>::
4808 plt_entry
[plt_entry_size
/ 4] =
4810 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4811 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4812 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4813 0xd61f0220, /* br x17. */
4819 Output_data_plt_aarch64_standard
<64, true>::
4820 plt_entry
[plt_entry_size
/ 4] =
4822 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4823 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4824 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4825 0xd61f0220, /* br x17. */
4829 template<int size
, bool big_endian
>
4831 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4833 Address got_address
,
4834 Address plt_address
)
4836 // PLT0 of the small PLT looks like this in ELF64 -
4837 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4838 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4839 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4841 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4842 // GOTPLT entry for this.
4844 // PLT0 will be slightly different in ELF32 due to different got entry
4846 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4847 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4849 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4850 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4851 // FIXME: This only works for 64bit
4852 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4853 gotplt_2nd_ent
, plt_address
+ 4);
4855 // Fill in R_AARCH64_LDST8_LO12
4856 elfcpp::Swap
<32, big_endian
>::writeval(
4858 ((this->first_plt_entry
[2] & 0xffc003ff)
4859 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4861 // Fill in R_AARCH64_ADD_ABS_LO12
4862 elfcpp::Swap
<32, big_endian
>::writeval(
4864 ((this->first_plt_entry
[3] & 0xffc003ff)
4865 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4869 // Subsequent entries in the PLT for an executable.
4870 // FIXME: This only works for 64bit
4872 template<int size
, bool big_endian
>
4874 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4876 Address got_address
,
4877 Address plt_address
,
4878 unsigned int got_offset
,
4879 unsigned int plt_offset
)
4881 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4883 Address gotplt_entry_address
= got_address
+ got_offset
;
4884 Address plt_entry_address
= plt_address
+ plt_offset
;
4886 // Fill in R_AARCH64_PCREL_ADR_HI21
4887 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4889 gotplt_entry_address
,
4892 // Fill in R_AARCH64_LDST64_ABS_LO12
4893 elfcpp::Swap
<32, big_endian
>::writeval(
4895 ((this->plt_entry
[1] & 0xffc003ff)
4896 | ((gotplt_entry_address
& 0xff8) << 7)));
4898 // Fill in R_AARCH64_ADD_ABS_LO12
4899 elfcpp::Swap
<32, big_endian
>::writeval(
4901 ((this->plt_entry
[2] & 0xffc003ff)
4902 | ((gotplt_entry_address
& 0xfff) <<10)));
4909 Output_data_plt_aarch64_standard
<32, false>::
4910 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4912 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4913 0x90000002, /* adrp x2, 0 */
4914 0x90000003, /* adrp x3, 0 */
4915 0xb9400042, /* ldr w2, [w2, #0] */
4916 0x11000063, /* add w3, w3, 0 */
4917 0xd61f0040, /* br x2 */
4918 0xd503201f, /* nop */
4919 0xd503201f, /* nop */
4924 Output_data_plt_aarch64_standard
<32, true>::
4925 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4927 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4928 0x90000002, /* adrp x2, 0 */
4929 0x90000003, /* adrp x3, 0 */
4930 0xb9400042, /* ldr w2, [w2, #0] */
4931 0x11000063, /* add w3, w3, 0 */
4932 0xd61f0040, /* br x2 */
4933 0xd503201f, /* nop */
4934 0xd503201f, /* nop */
4939 Output_data_plt_aarch64_standard
<64, false>::
4940 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4942 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4943 0x90000002, /* adrp x2, 0 */
4944 0x90000003, /* adrp x3, 0 */
4945 0xf9400042, /* ldr x2, [x2, #0] */
4946 0x91000063, /* add x3, x3, 0 */
4947 0xd61f0040, /* br x2 */
4948 0xd503201f, /* nop */
4949 0xd503201f, /* nop */
4954 Output_data_plt_aarch64_standard
<64, true>::
4955 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4957 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4958 0x90000002, /* adrp x2, 0 */
4959 0x90000003, /* adrp x3, 0 */
4960 0xf9400042, /* ldr x2, [x2, #0] */
4961 0x91000063, /* add x3, x3, 0 */
4962 0xd61f0040, /* br x2 */
4963 0xd503201f, /* nop */
4964 0xd503201f, /* nop */
4967 template<int size
, bool big_endian
>
4969 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4971 Address gotplt_address
,
4972 Address plt_address
,
4974 unsigned int tlsdesc_got_offset
,
4975 unsigned int plt_offset
)
4977 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4979 // move DT_TLSDESC_GOT address into x2
4980 // move .got.plt address into x3
4981 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4982 Address plt_entry_address
= plt_address
+ plt_offset
;
4984 // R_AARCH64_ADR_PREL_PG_HI21
4985 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4988 plt_entry_address
+ 4);
4990 // R_AARCH64_ADR_PREL_PG_HI21
4991 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4994 plt_entry_address
+ 8);
4996 // R_AARCH64_LDST64_ABS_LO12
4997 elfcpp::Swap
<32, big_endian
>::writeval(
4999 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
5000 | ((tlsdesc_got_entry
& 0xff8) << 7)));
5002 // R_AARCH64_ADD_ABS_LO12
5003 elfcpp::Swap
<32, big_endian
>::writeval(
5005 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
5006 | ((gotplt_address
& 0xfff) << 10)));
5009 // Write out the PLT. This uses the hand-coded instructions above,
5010 // and adjusts them as needed. This is specified by the AMD64 ABI.
5012 template<int size
, bool big_endian
>
5014 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
5016 const off_t offset
= this->offset();
5017 const section_size_type oview_size
=
5018 convert_to_section_size_type(this->data_size());
5019 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
5021 const off_t got_file_offset
= this->got_plt_
->offset();
5022 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
5023 == this->got_irelative_
->offset());
5025 const section_size_type got_size
=
5026 convert_to_section_size_type(this->got_plt_
->data_size()
5027 + this->got_irelative_
->data_size());
5028 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
5031 unsigned char* pov
= oview
;
5033 // The base address of the .plt section.
5034 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
5035 // The base address of the PLT portion of the .got section.
5036 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
5037 = this->got_plt_
->address();
5039 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
5040 pov
+= this->first_plt_entry_offset();
5042 // The first three entries in .got.plt are reserved.
5043 unsigned char* got_pov
= got_view
;
5044 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
5045 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5047 unsigned int plt_offset
= this->first_plt_entry_offset();
5048 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5049 const unsigned int count
= this->count_
+ this->irelative_count_
;
5050 for (unsigned int plt_index
= 0;
5053 pov
+= this->get_plt_entry_size(),
5054 got_pov
+= size
/ 8,
5055 plt_offset
+= this->get_plt_entry_size(),
5056 got_offset
+= size
/ 8)
5058 // Set and adjust the PLT entry itself.
5059 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
5060 got_offset
, plt_offset
);
5062 // Set the entry in the GOT, which points to plt0.
5063 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
5066 if (this->has_tlsdesc_entry())
5068 // Set and adjust the reserved TLSDESC PLT entry.
5069 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
5070 // The base address of the .base section.
5071 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
5072 this->got_
->address();
5073 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
5074 tlsdesc_got_offset
, plt_offset
);
5075 pov
+= this->get_plt_tlsdesc_entry_size();
5078 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
5079 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
5081 of
->write_output_view(offset
, oview_size
, oview
);
5082 of
->write_output_view(got_file_offset
, got_size
, got_view
);
5085 // Telling how to update the immediate field of an instruction.
5086 struct AArch64_howto
5088 // The immediate field mask.
5089 elfcpp::Elf_Xword dst_mask
;
5091 // The offset to apply relocation immediate
5094 // The second part offset, if the immediate field has two parts.
5095 // -1 if the immediate field has only one part.
5099 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
5101 {0, -1, -1}, // DATA
5102 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
5103 {0xffffe0, 5, -1}, // LD [23:5]-imm19
5104 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
5105 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
5106 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
5107 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
5108 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
5109 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
5110 {0x3ffffff, 0, -1}, // B [25:0]-imm26
5111 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
5114 // AArch64 relocate function class
5116 template<int size
, bool big_endian
>
5117 class AArch64_relocate_functions
5122 STATUS_OKAY
, // No error during relocation.
5123 STATUS_OVERFLOW
, // Relocation overflow.
5124 STATUS_BAD_RELOC
, // Relocation cannot be applied.
5127 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
5128 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
5129 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
5130 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
5131 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
5132 typedef Stub_table
<size
, big_endian
> The_stub_table
;
5133 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
5134 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
5136 // Return the page address of the address.
5137 // Page(address) = address & ~0xFFF
5139 static inline AArch64_valtype
5140 Page(Address address
)
5142 return (address
& (~static_cast<Address
>(0xFFF)));
5146 // Update instruction (pointed by view) with selected bits (immed).
5147 // val = (val & ~dst_mask) | (immed << doffset)
5149 template<int valsize
>
5151 update_view(unsigned char* view
,
5152 AArch64_valtype immed
,
5153 elfcpp::Elf_Xword doffset
,
5154 elfcpp::Elf_Xword dst_mask
)
5156 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5157 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5158 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5160 // Clear immediate fields.
5162 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5163 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5166 // Update two parts of an instruction (pointed by view) with selected
5167 // bits (immed1 and immed2).
5168 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5170 template<int valsize
>
5172 update_view_two_parts(
5173 unsigned char* view
,
5174 AArch64_valtype immed1
,
5175 AArch64_valtype immed2
,
5176 elfcpp::Elf_Xword doffset1
,
5177 elfcpp::Elf_Xword doffset2
,
5178 elfcpp::Elf_Xword dst_mask
)
5180 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5181 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5182 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5184 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5185 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
5186 (immed2
<< doffset2
)));
5189 // Update adr or adrp instruction with immed.
5190 // In adr and adrp: [30:29] immlo [23:5] immhi
5193 update_adr(unsigned char* view
, AArch64_valtype immed
)
5195 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
5196 This::template update_view_two_parts
<32>(
5199 (immed
& 0x1ffffc) >> 2,
5205 // Update movz/movn instruction with bits immed.
5206 // Set instruction to movz if is_movz is true, otherwise set instruction
5210 update_movnz(unsigned char* view
,
5211 AArch64_valtype immed
,
5214 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
5215 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5216 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
5218 const elfcpp::Elf_Xword doffset
=
5219 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
5220 const elfcpp::Elf_Xword dst_mask
=
5221 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
5223 // Clear immediate fields and opc code.
5224 val
&= ~(dst_mask
| (0x3 << 29));
5226 // Set instruction to movz or movn.
5227 // movz: [30:29] is 10 movn: [30:29] is 00
5231 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
5232 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5237 // Update selected bits in text.
5239 template<int valsize
>
5240 static inline typename
This::Status
5241 reloc_common(unsigned char* view
, Address x
,
5242 const AArch64_reloc_property
* reloc_property
)
5244 // Select bits from X.
5245 Address immed
= reloc_property
->select_x_value(x
);
5248 const AArch64_reloc_property::Reloc_inst inst
=
5249 reloc_property
->reloc_inst();
5250 // If it is a data relocation or instruction has 2 parts of immediate
5251 // fields, you should not call pcrela_general.
5252 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
5253 aarch64_howto
[inst
].doffset
!= -1);
5254 This::template update_view
<valsize
>(view
, immed
,
5255 aarch64_howto
[inst
].doffset
,
5256 aarch64_howto
[inst
].dst_mask
);
5258 // Do check overflow or alignment if needed.
5259 return (reloc_property
->checkup_x_value(x
)
5261 : This::STATUS_OVERFLOW
);
5264 // Construct a B insn. Note, although we group it here with other relocation
5265 // operation, there is actually no 'relocation' involved here.
5267 construct_b(unsigned char* view
, unsigned int branch_offset
)
5269 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5273 // Do a simple rela relocation at unaligned addresses.
5275 template<int valsize
>
5276 static inline typename
This::Status
5277 rela_ua(unsigned char* view
,
5278 const Sized_relobj_file
<size
, big_endian
>* object
,
5279 const Symbol_value
<size
>* psymval
,
5280 AArch64_valtype addend
,
5281 const AArch64_reloc_property
* reloc_property
)
5283 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5285 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5286 psymval
->value(object
, addend
);
5287 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5288 static_cast<Valtype
>(x
));
5289 return (reloc_property
->checkup_x_value(x
)
5291 : This::STATUS_OVERFLOW
);
5294 // Do a simple pc-relative relocation at unaligned addresses.
5296 template<int valsize
>
5297 static inline typename
This::Status
5298 pcrela_ua(unsigned char* view
,
5299 const Sized_relobj_file
<size
, big_endian
>* object
,
5300 const Symbol_value
<size
>* psymval
,
5301 AArch64_valtype addend
,
5303 const AArch64_reloc_property
* reloc_property
)
5305 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5307 Address x
= psymval
->value(object
, addend
) - address
;
5308 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5309 static_cast<Valtype
>(x
));
5310 return (reloc_property
->checkup_x_value(x
)
5312 : This::STATUS_OVERFLOW
);
5315 // Do a simple rela relocation at aligned addresses.
5317 template<int valsize
>
5318 static inline typename
This::Status
5320 unsigned char* view
,
5321 const Sized_relobj_file
<size
, big_endian
>* object
,
5322 const Symbol_value
<size
>* psymval
,
5323 AArch64_valtype addend
,
5324 const AArch64_reloc_property
* reloc_property
)
5326 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5327 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5328 Address x
= psymval
->value(object
, addend
);
5329 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5330 return (reloc_property
->checkup_x_value(x
)
5332 : This::STATUS_OVERFLOW
);
5335 // Do relocate. Update selected bits in text.
5336 // new_val = (val & ~dst_mask) | (immed << doffset)
5338 template<int valsize
>
5339 static inline typename
This::Status
5340 rela_general(unsigned char* view
,
5341 const Sized_relobj_file
<size
, big_endian
>* object
,
5342 const Symbol_value
<size
>* psymval
,
5343 AArch64_valtype addend
,
5344 const AArch64_reloc_property
* reloc_property
)
5346 // Calculate relocation.
5347 Address x
= psymval
->value(object
, addend
);
5348 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5351 // Do relocate. Update selected bits in text.
5352 // new val = (val & ~dst_mask) | (immed << doffset)
5354 template<int valsize
>
5355 static inline typename
This::Status
5357 unsigned char* view
,
5359 AArch64_valtype addend
,
5360 const AArch64_reloc_property
* reloc_property
)
5362 // Calculate relocation.
5363 Address x
= s
+ addend
;
5364 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5367 // Do address relative relocate. Update selected bits in text.
5368 // new val = (val & ~dst_mask) | (immed << doffset)
5370 template<int valsize
>
5371 static inline typename
This::Status
5373 unsigned char* view
,
5374 const Sized_relobj_file
<size
, big_endian
>* object
,
5375 const Symbol_value
<size
>* psymval
,
5376 AArch64_valtype addend
,
5378 const AArch64_reloc_property
* reloc_property
)
5380 // Calculate relocation.
5381 Address x
= psymval
->value(object
, addend
) - address
;
5382 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5386 // Calculate (S + A) - address, update adr instruction.
5388 static inline typename
This::Status
5389 adr(unsigned char* view
,
5390 const Sized_relobj_file
<size
, big_endian
>* object
,
5391 const Symbol_value
<size
>* psymval
,
5394 const AArch64_reloc_property
* /* reloc_property */)
5396 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5397 // Pick bits [20:0] of X.
5398 AArch64_valtype immed
= x
& 0x1fffff;
5399 update_adr(view
, immed
);
5400 // Check -2^20 <= X < 2^20
5401 return (size
== 64 && Bits
<21>::has_overflow((x
))
5402 ? This::STATUS_OVERFLOW
5403 : This::STATUS_OKAY
);
5406 // Calculate PG(S+A) - PG(address), update adrp instruction.
5407 // R_AARCH64_ADR_PREL_PG_HI21
5409 static inline typename
This::Status
5411 unsigned char* view
,
5415 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5416 // Pick [32:12] of X.
5417 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5418 update_adr(view
, immed
);
5419 // Check -2^32 <= X < 2^32
5420 return (size
== 64 && Bits
<33>::has_overflow((x
))
5421 ? This::STATUS_OVERFLOW
5422 : This::STATUS_OKAY
);
5425 // Calculate PG(S+A) - PG(address), update adrp instruction.
5426 // R_AARCH64_ADR_PREL_PG_HI21
5428 static inline typename
This::Status
5429 adrp(unsigned char* view
,
5430 const Sized_relobj_file
<size
, big_endian
>* object
,
5431 const Symbol_value
<size
>* psymval
,
5434 const AArch64_reloc_property
* reloc_property
)
5436 Address sa
= psymval
->value(object
, addend
);
5437 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5438 // Pick [32:12] of X.
5439 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5440 update_adr(view
, immed
);
5441 return (reloc_property
->checkup_x_value(x
)
5443 : This::STATUS_OVERFLOW
);
5446 // Update mov[n/z] instruction. Check overflow if needed.
5447 // If X >=0, set the instruction to movz and its immediate value to the
5449 // If X < 0, set the instruction to movn and its immediate value to
5450 // NOT (selected bits of).
5452 static inline typename
This::Status
5453 movnz(unsigned char* view
,
5455 const AArch64_reloc_property
* reloc_property
)
5457 // Select bits from X.
5460 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5461 if (static_cast<SignedW
>(x
) >= 0)
5463 immed
= reloc_property
->select_x_value(x
);
5468 immed
= reloc_property
->select_x_value(~x
);;
5472 // Update movnz instruction.
5473 update_movnz(view
, immed
, is_movz
);
5475 // Do check overflow or alignment if needed.
5476 return (reloc_property
->checkup_x_value(x
)
5478 : This::STATUS_OVERFLOW
);
5482 maybe_apply_stub(unsigned int,
5483 const The_relocate_info
*,
5487 const Sized_symbol
<size
>*,
5488 const Symbol_value
<size
>*,
5489 const Sized_relobj_file
<size
, big_endian
>*,
5492 }; // End of AArch64_relocate_functions
5495 // For a certain relocation type (usually jump/branch), test to see if the
5496 // destination needs a stub to fulfil. If so, re-route the destination of the
5497 // original instruction to the stub, note, at this time, the stub has already
5500 template<int size
, bool big_endian
>
5502 AArch64_relocate_functions
<size
, big_endian
>::
5503 maybe_apply_stub(unsigned int r_type
,
5504 const The_relocate_info
* relinfo
,
5505 const The_rela
& rela
,
5506 unsigned char* view
,
5508 const Sized_symbol
<size
>* gsym
,
5509 const Symbol_value
<size
>* psymval
,
5510 const Sized_relobj_file
<size
, big_endian
>* object
,
5511 section_size_type current_group_size
)
5513 if (parameters
->options().relocatable())
5516 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5517 Address branch_target
= psymval
->value(object
, 0) + addend
;
5519 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5520 if (stub_type
== ST_NONE
)
5523 const The_aarch64_relobj
* aarch64_relobj
=
5524 static_cast<const The_aarch64_relobj
*>(object
);
5525 const AArch64_reloc_property
* arp
=
5526 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5527 gold_assert(arp
!= NULL
);
5529 // We don't create stubs for undefined symbols, but do for weak.
5531 && !gsym
->use_plt_offset(arp
->reference_flags())
5532 && gsym
->is_undefined())
5534 gold_debug(DEBUG_TARGET
,
5535 "stub: looking for a stub for undefined symbol %s in file %s",
5536 gsym
->name(), aarch64_relobj
->name().c_str());
5540 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5541 gold_assert(stub_table
!= NULL
);
5543 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5544 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5545 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5546 gold_assert(stub
!= NULL
);
5548 Address new_branch_target
= stub_table
->address() + stub
->offset();
5549 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5550 new_branch_target
- address
;
5551 typename
This::Status status
= This::template
5552 rela_general
<32>(view
, branch_offset
, 0, arp
);
5553 if (status
!= This::STATUS_OKAY
)
5554 gold_error(_("Stub is too far away, try a smaller value "
5555 "for '--stub-group-size'. The current value is 0x%lx."),
5556 static_cast<unsigned long>(current_group_size
));
5561 // Group input sections for stub generation.
5563 // We group input sections in an output section so that the total size,
5564 // including any padding space due to alignment is smaller than GROUP_SIZE
5565 // unless the only input section in group is bigger than GROUP_SIZE already.
5566 // Then an ARM stub table is created to follow the last input section
5567 // in group. For each group an ARM stub table is created an is placed
5568 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5569 // extend the group after the stub table.
5571 template<int size
, bool big_endian
>
5573 Target_aarch64
<size
, big_endian
>::group_sections(
5575 section_size_type group_size
,
5576 bool stubs_always_after_branch
,
5579 // Group input sections and insert stub table
5580 Layout::Section_list section_list
;
5581 layout
->get_executable_sections(§ion_list
);
5582 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5583 p
!= section_list
.end();
5586 AArch64_output_section
<size
, big_endian
>* output_section
=
5587 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5588 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5594 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5595 // section of RELOBJ.
5597 template<int size
, bool big_endian
>
5598 AArch64_input_section
<size
, big_endian
>*
5599 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5600 Relobj
* relobj
, unsigned int shndx
) const
5602 Section_id
sid(relobj
, shndx
);
5603 typename
AArch64_input_section_map::const_iterator p
=
5604 this->aarch64_input_section_map_
.find(sid
);
5605 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5609 // Make a new AArch64_input_section object.
5611 template<int size
, bool big_endian
>
5612 AArch64_input_section
<size
, big_endian
>*
5613 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5614 Relobj
* relobj
, unsigned int shndx
)
5616 Section_id
sid(relobj
, shndx
);
5618 AArch64_input_section
<size
, big_endian
>* input_section
=
5619 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5620 input_section
->init();
5622 // Register new AArch64_input_section in map for look-up.
5623 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5624 this->aarch64_input_section_map_
.insert(
5625 std::make_pair(sid
, input_section
));
5627 // Make sure that it we have not created another AArch64_input_section
5628 // for this input section already.
5629 gold_assert(ins
.second
);
5631 return input_section
;
5635 // Relaxation hook. This is where we do stub generation.
5637 template<int size
, bool big_endian
>
5639 Target_aarch64
<size
, big_endian
>::do_relax(
5641 const Input_objects
* input_objects
,
5642 Symbol_table
* symtab
,
5646 gold_assert(!parameters
->options().relocatable());
5649 // We don't handle negative stub_group_size right now.
5650 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5651 if (this->stub_group_size_
== 1)
5653 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5654 // will fail to link. The user will have to relink with an explicit
5655 // group size option.
5656 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5659 group_sections(layout
, this->stub_group_size_
, true, task
);
5663 // If this is not the first pass, addresses and file offsets have
5664 // been reset at this point, set them here.
5665 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5666 sp
!= this->stub_tables_
.end(); ++sp
)
5668 The_stub_table
* stt
= *sp
;
5669 The_aarch64_input_section
* owner
= stt
->owner();
5670 off_t off
= align_address(owner
->original_size(),
5672 stt
->set_address_and_file_offset(owner
->address() + off
,
5673 owner
->offset() + off
);
5677 // Scan relocs for relocation stubs
5678 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5679 op
!= input_objects
->relobj_end();
5682 The_aarch64_relobj
* aarch64_relobj
=
5683 static_cast<The_aarch64_relobj
*>(*op
);
5684 // Lock the object so we can read from it. This is only called
5685 // single-threaded from Layout::finalize, so it is OK to lock.
5686 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5687 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5690 bool any_stub_table_changed
= false;
5691 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5692 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5694 The_stub_table
* stub_table
= *siter
;
5695 if (stub_table
->update_data_size_changed_p())
5697 The_aarch64_input_section
* owner
= stub_table
->owner();
5698 uint64_t address
= owner
->address();
5699 off_t offset
= owner
->offset();
5700 owner
->reset_address_and_file_offset();
5701 owner
->set_address_and_file_offset(address
, offset
);
5703 any_stub_table_changed
= true;
5707 // Do not continue relaxation.
5708 bool continue_relaxation
= any_stub_table_changed
;
5709 if (!continue_relaxation
)
5710 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5711 (sp
!= this->stub_tables_
.end());
5713 (*sp
)->finalize_stubs();
5715 return continue_relaxation
;
5719 // Make a new Stub_table.
5721 template<int size
, bool big_endian
>
5722 Stub_table
<size
, big_endian
>*
5723 Target_aarch64
<size
, big_endian
>::new_stub_table(
5724 AArch64_input_section
<size
, big_endian
>* owner
)
5726 Stub_table
<size
, big_endian
>* stub_table
=
5727 new Stub_table
<size
, big_endian
>(owner
);
5728 stub_table
->set_address(align_address(
5729 owner
->address() + owner
->data_size(), 8));
5730 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5731 stub_table
->finalize_data_size();
5733 this->stub_tables_
.push_back(stub_table
);
5739 template<int size
, bool big_endian
>
5741 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5742 void* arg
, unsigned int r_type
, uint64_t) const
5744 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5745 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5746 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5747 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5748 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5749 gold_assert(psymval
->is_tls_symbol());
5750 // The value of a TLS symbol is the offset in the TLS segment.
5751 return psymval
->value(ti
.object
, 0);
5754 // Return the number of entries in the PLT.
5756 template<int size
, bool big_endian
>
5758 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5760 if (this->plt_
== NULL
)
5762 return this->plt_
->entry_count();
5765 // Return the offset of the first non-reserved PLT entry.
5767 template<int size
, bool big_endian
>
5769 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5771 return this->plt_
->first_plt_entry_offset();
5774 // Return the size of each PLT entry.
5776 template<int size
, bool big_endian
>
5778 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5780 return this->plt_
->get_plt_entry_size();
5783 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5785 template<int size
, bool big_endian
>
5787 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5788 Symbol_table
* symtab
, Layout
* layout
)
5790 if (this->tls_base_symbol_defined_
)
5793 Output_segment
* tls_segment
= layout
->tls_segment();
5794 if (tls_segment
!= NULL
)
5796 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5797 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5798 Symbol_table::PREDEFINED
,
5802 elfcpp::STV_HIDDEN
, 0,
5803 Symbol::SEGMENT_START
,
5806 this->tls_base_symbol_defined_
= true;
5809 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5811 template<int size
, bool big_endian
>
5813 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5814 Symbol_table
* symtab
, Layout
* layout
)
5816 if (this->plt_
== NULL
)
5817 this->make_plt_section(symtab
, layout
);
5819 if (!this->plt_
->has_tlsdesc_entry())
5821 // Allocate the TLSDESC_GOT entry.
5822 Output_data_got_aarch64
<size
, big_endian
>* got
=
5823 this->got_section(symtab
, layout
);
5824 unsigned int got_offset
= got
->add_constant(0);
5826 // Allocate the TLSDESC_PLT entry.
5827 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5831 // Create a GOT entry for the TLS module index.
5833 template<int size
, bool big_endian
>
5835 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5836 Symbol_table
* symtab
, Layout
* layout
,
5837 Sized_relobj_file
<size
, big_endian
>* object
)
5839 if (this->got_mod_index_offset_
== -1U)
5841 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5842 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5843 Output_data_got_aarch64
<size
, big_endian
>* got
=
5844 this->got_section(symtab
, layout
);
5845 unsigned int got_offset
= got
->add_constant(0);
5846 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5848 got
->add_constant(0);
5849 this->got_mod_index_offset_
= got_offset
;
5851 return this->got_mod_index_offset_
;
5854 // Optimize the TLS relocation type based on what we know about the
5855 // symbol. IS_FINAL is true if the final address of this symbol is
5856 // known at link time.
5858 template<int size
, bool big_endian
>
5859 tls::Tls_optimization
5860 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5863 // If we are generating a shared library, then we can't do anything
5865 if (parameters
->options().shared())
5866 return tls::TLSOPT_NONE
;
5870 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5871 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5872 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5873 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5874 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5875 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5876 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5877 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5878 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5879 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5880 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5881 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5882 // These are General-Dynamic which permits fully general TLS
5883 // access. Since we know that we are generating an executable,
5884 // we can convert this to Initial-Exec. If we also know that
5885 // this is a local symbol, we can further switch to Local-Exec.
5887 return tls::TLSOPT_TO_LE
;
5888 return tls::TLSOPT_TO_IE
;
5890 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5891 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5892 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5893 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5894 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5895 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5896 // These are Local-Dynamic, which refer to local symbols in the
5897 // dynamic TLS block. Since we know that we generating an
5898 // executable, we can switch to Local-Exec.
5899 return tls::TLSOPT_TO_LE
;
5901 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5902 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5903 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5904 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5905 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5906 // These are Initial-Exec relocs which get the thread offset
5907 // from the GOT. If we know that we are linking against the
5908 // local symbol, we can switch to Local-Exec, which links the
5909 // thread offset into the instruction.
5911 return tls::TLSOPT_TO_LE
;
5912 return tls::TLSOPT_NONE
;
5914 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5915 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5916 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5917 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5918 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5919 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5920 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5921 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5922 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12
:
5923 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC
:
5924 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12
:
5925 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC
:
5926 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12
:
5927 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC
:
5928 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12
:
5929 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC
:
5930 // When we already have Local-Exec, there is nothing further we
5932 return tls::TLSOPT_NONE
;
5939 // Returns true if this relocation type could be that of a function pointer.
5941 template<int size
, bool big_endian
>
5943 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5944 unsigned int r_type
)
5948 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5949 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5950 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5951 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5952 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5960 // For safe ICF, scan a relocation for a local symbol to check if it
5961 // corresponds to a function pointer being taken. In that case mark
5962 // the function whose pointer was taken as not foldable.
5964 template<int size
, bool big_endian
>
5966 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5969 Target_aarch64
<size
, big_endian
>* ,
5970 Sized_relobj_file
<size
, big_endian
>* ,
5973 const elfcpp::Rela
<size
, big_endian
>& ,
5974 unsigned int r_type
,
5975 const elfcpp::Sym
<size
, big_endian
>&)
5977 // When building a shared library, do not fold any local symbols.
5978 return (parameters
->options().shared()
5979 || possible_function_pointer_reloc(r_type
));
5982 // For safe ICF, scan a relocation for a global symbol to check if it
5983 // corresponds to a function pointer being taken. In that case mark
5984 // the function whose pointer was taken as not foldable.
5986 template<int size
, bool big_endian
>
5988 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5991 Target_aarch64
<size
, big_endian
>* ,
5992 Sized_relobj_file
<size
, big_endian
>* ,
5995 const elfcpp::Rela
<size
, big_endian
>& ,
5996 unsigned int r_type
,
5999 // When building a shared library, do not fold symbols whose visibility
6000 // is hidden, internal or protected.
6001 return ((parameters
->options().shared()
6002 && (gsym
->visibility() == elfcpp::STV_INTERNAL
6003 || gsym
->visibility() == elfcpp::STV_PROTECTED
6004 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
6005 || possible_function_pointer_reloc(r_type
));
6008 // Report an unsupported relocation against a local symbol.
6010 template<int size
, bool big_endian
>
6012 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
6013 Sized_relobj_file
<size
, big_endian
>* object
,
6014 unsigned int r_type
)
6016 gold_error(_("%s: unsupported reloc %u against local symbol"),
6017 object
->name().c_str(), r_type
);
6020 // We are about to emit a dynamic relocation of type R_TYPE. If the
6021 // dynamic linker does not support it, issue an error.
6023 template<int size
, bool big_endian
>
6025 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
6026 unsigned int r_type
)
6028 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
6032 // These are the relocation types supported by glibc for AARCH64.
6033 case elfcpp::R_AARCH64_NONE
:
6034 case elfcpp::R_AARCH64_COPY
:
6035 case elfcpp::R_AARCH64_GLOB_DAT
:
6036 case elfcpp::R_AARCH64_JUMP_SLOT
:
6037 case elfcpp::R_AARCH64_RELATIVE
:
6038 case elfcpp::R_AARCH64_TLS_DTPREL64
:
6039 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
6040 case elfcpp::R_AARCH64_TLS_TPREL64
:
6041 case elfcpp::R_AARCH64_TLSDESC
:
6042 case elfcpp::R_AARCH64_IRELATIVE
:
6043 case elfcpp::R_AARCH64_ABS32
:
6044 case elfcpp::R_AARCH64_ABS64
:
6051 // This prevents us from issuing more than one error per reloc
6052 // section. But we can still wind up issuing more than one
6053 // error per object file.
6054 if (this->issued_non_pic_error_
)
6056 gold_assert(parameters
->options().output_is_position_independent());
6057 object
->error(_("requires unsupported dynamic reloc; "
6058 "recompile with -fPIC"));
6059 this->issued_non_pic_error_
= true;
6063 // Return whether we need to make a PLT entry for a relocation of the
6064 // given type against a STT_GNU_IFUNC symbol.
6066 template<int size
, bool big_endian
>
6068 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
6069 Sized_relobj_file
<size
, big_endian
>* object
,
6070 unsigned int r_type
)
6072 const AArch64_reloc_property
* arp
=
6073 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6074 gold_assert(arp
!= NULL
);
6076 int flags
= arp
->reference_flags();
6077 if (flags
& Symbol::TLS_REF
)
6079 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
6080 object
->name().c_str(), arp
->name().c_str());
6086 // Scan a relocation for a local symbol.
6088 template<int size
, bool big_endian
>
6090 Target_aarch64
<size
, big_endian
>::Scan::local(
6091 Symbol_table
* symtab
,
6093 Target_aarch64
<size
, big_endian
>* target
,
6094 Sized_relobj_file
<size
, big_endian
>* object
,
6095 unsigned int data_shndx
,
6096 Output_section
* output_section
,
6097 const elfcpp::Rela
<size
, big_endian
>& rela
,
6098 unsigned int r_type
,
6099 const elfcpp::Sym
<size
, big_endian
>& lsym
,
6105 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6107 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6109 // A local STT_GNU_IFUNC symbol may require a PLT entry.
6110 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
6111 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
6112 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
6116 case elfcpp::R_AARCH64_NONE
:
6119 case elfcpp::R_AARCH64_ABS32
:
6120 case elfcpp::R_AARCH64_ABS16
:
6121 if (parameters
->options().output_is_position_independent())
6123 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6124 object
->name().c_str(), r_type
);
6128 case elfcpp::R_AARCH64_ABS64
:
6129 // If building a shared library or pie, we need to mark this as a dynmic
6130 // reloction, so that the dynamic loader can relocate it.
6131 if (parameters
->options().output_is_position_independent())
6133 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6134 rela_dyn
->add_local_relative(object
, r_sym
,
6135 elfcpp::R_AARCH64_RELATIVE
,
6138 rela
.get_r_offset(),
6139 rela
.get_r_addend(),
6144 case elfcpp::R_AARCH64_PREL64
:
6145 case elfcpp::R_AARCH64_PREL32
:
6146 case elfcpp::R_AARCH64_PREL16
:
6149 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6150 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6151 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6152 // The above relocations are used to access GOT entries.
6154 Output_data_got_aarch64
<size
, big_endian
>* got
=
6155 target
->got_section(symtab
, layout
);
6156 bool is_new
= false;
6157 // This symbol requires a GOT entry.
6159 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
6161 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
6162 if (is_new
&& parameters
->options().output_is_position_independent())
6163 target
->rela_dyn_section(layout
)->
6164 add_local_relative(object
,
6166 elfcpp::R_AARCH64_RELATIVE
,
6168 object
->local_got_offset(r_sym
,
6175 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6176 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6177 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6178 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6179 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6180 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6181 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6182 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6183 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6184 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6185 if (parameters
->options().output_is_position_independent())
6187 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6188 object
->name().c_str(), r_type
);
6192 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6193 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6194 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6195 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6196 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6197 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6198 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6199 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6200 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6201 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6204 // Control flow, pc-relative. We don't need to do anything for a relative
6205 // addressing relocation against a local symbol if it does not reference
6207 case elfcpp::R_AARCH64_TSTBR14
:
6208 case elfcpp::R_AARCH64_CONDBR19
:
6209 case elfcpp::R_AARCH64_JUMP26
:
6210 case elfcpp::R_AARCH64_CALL26
:
6213 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6214 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6216 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6217 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6218 if (tlsopt
== tls::TLSOPT_TO_LE
)
6221 layout
->set_has_static_tls();
6222 // Create a GOT entry for the tp-relative offset.
6223 if (!parameters
->doing_static_link())
6225 Output_data_got_aarch64
<size
, big_endian
>* got
=
6226 target
->got_section(symtab
, layout
);
6227 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
6228 target
->rela_dyn_section(layout
),
6229 elfcpp::R_AARCH64_TLS_TPREL64
);
6231 else if (!object
->local_has_got_offset(r_sym
,
6232 GOT_TYPE_TLS_OFFSET
))
6234 Output_data_got_aarch64
<size
, big_endian
>* got
=
6235 target
->got_section(symtab
, layout
);
6236 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
6237 unsigned int got_offset
=
6238 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
6239 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6240 gold_assert(addend
== 0);
6241 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
6247 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6248 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6250 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6251 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6252 if (tlsopt
== tls::TLSOPT_TO_LE
)
6254 layout
->set_has_static_tls();
6257 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6259 Output_data_got_aarch64
<size
, big_endian
>* got
=
6260 target
->got_section(symtab
, layout
);
6261 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
6263 target
->rela_dyn_section(layout
),
6264 elfcpp::R_AARCH64_TLS_DTPMOD64
);
6268 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6269 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6270 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6271 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6272 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6273 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6274 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6275 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6276 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12
:
6277 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC
:
6278 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12
:
6279 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC
:
6280 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12
:
6281 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC
:
6282 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12
:
6283 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC
:
6285 layout
->set_has_static_tls();
6286 bool output_is_shared
= parameters
->options().shared();
6287 if (output_is_shared
)
6288 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6289 object
->name().c_str(), r_type
);
6293 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6294 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6296 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6297 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6298 if (tlsopt
== tls::TLSOPT_NONE
)
6300 // Create a GOT entry for the module index.
6301 target
->got_mod_index_entry(symtab
, layout
, object
);
6303 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6304 unsupported_reloc_local(object
, r_type
);
6308 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6309 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6310 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6311 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6314 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6315 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6316 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6318 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6319 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6320 target
->define_tls_base_symbol(symtab
, layout
);
6321 if (tlsopt
== tls::TLSOPT_NONE
)
6323 // Create reserved PLT and GOT entries for the resolver.
6324 target
->reserve_tlsdesc_entries(symtab
, layout
);
6326 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6327 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6328 // entry needs to be in an area in .got.plt, not .got. Call
6329 // got_section to make sure the section has been created.
6330 target
->got_section(symtab
, layout
);
6331 Output_data_got
<size
, big_endian
>* got
=
6332 target
->got_tlsdesc_section();
6333 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6334 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
6336 unsigned int got_offset
= got
->add_constant(0);
6337 got
->add_constant(0);
6338 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
6340 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6341 // We store the arguments we need in a vector, and use
6342 // the index into the vector as the parameter to pass
6343 // to the target specific routines.
6344 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6345 void* arg
= reinterpret_cast<void*>(intarg
);
6346 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6347 got
, got_offset
, 0);
6350 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6351 unsupported_reloc_local(object
, r_type
);
6355 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6359 unsupported_reloc_local(object
, r_type
);
6364 // Report an unsupported relocation against a global symbol.
6366 template<int size
, bool big_endian
>
6368 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6369 Sized_relobj_file
<size
, big_endian
>* object
,
6370 unsigned int r_type
,
6373 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6374 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6377 template<int size
, bool big_endian
>
6379 Target_aarch64
<size
, big_endian
>::Scan::global(
6380 Symbol_table
* symtab
,
6382 Target_aarch64
<size
, big_endian
>* target
,
6383 Sized_relobj_file
<size
, big_endian
> * object
,
6384 unsigned int data_shndx
,
6385 Output_section
* output_section
,
6386 const elfcpp::Rela
<size
, big_endian
>& rela
,
6387 unsigned int r_type
,
6390 // A STT_GNU_IFUNC symbol may require a PLT entry.
6391 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6392 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6393 target
->make_plt_entry(symtab
, layout
, gsym
);
6395 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6397 const AArch64_reloc_property
* arp
=
6398 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6399 gold_assert(arp
!= NULL
);
6403 case elfcpp::R_AARCH64_NONE
:
6406 case elfcpp::R_AARCH64_ABS16
:
6407 case elfcpp::R_AARCH64_ABS32
:
6408 case elfcpp::R_AARCH64_ABS64
:
6410 // Make a PLT entry if necessary.
6411 if (gsym
->needs_plt_entry())
6413 target
->make_plt_entry(symtab
, layout
, gsym
);
6414 // Since this is not a PC-relative relocation, we may be
6415 // taking the address of a function. In that case we need to
6416 // set the entry in the dynamic symbol table to the address of
6418 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6419 gsym
->set_needs_dynsym_value();
6421 // Make a dynamic relocation if necessary.
6422 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6424 if (!parameters
->options().output_is_position_independent()
6425 && gsym
->may_need_copy_reloc())
6427 target
->copy_reloc(symtab
, layout
, object
,
6428 data_shndx
, output_section
, gsym
, rela
);
6430 else if (r_type
== elfcpp::R_AARCH64_ABS64
6431 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6432 && gsym
->can_use_relative_reloc(false)
6433 && !gsym
->is_from_dynobj()
6434 && !gsym
->is_undefined()
6435 && !gsym
->is_preemptible())
6437 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6438 // symbol. This makes a function address in a PIE executable
6439 // match the address in a shared library that it links against.
6440 Reloc_section
* rela_dyn
=
6441 target
->rela_irelative_section(layout
);
6442 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6443 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6444 output_section
, object
,
6446 rela
.get_r_offset(),
6447 rela
.get_r_addend());
6449 else if (r_type
== elfcpp::R_AARCH64_ABS64
6450 && gsym
->can_use_relative_reloc(false))
6452 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6453 rela_dyn
->add_global_relative(gsym
,
6454 elfcpp::R_AARCH64_RELATIVE
,
6458 rela
.get_r_offset(),
6459 rela
.get_r_addend(),
6464 check_non_pic(object
, r_type
);
6465 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6466 rela_dyn
= target
->rela_dyn_section(layout
);
6467 rela_dyn
->add_global(
6468 gsym
, r_type
, output_section
, object
,
6469 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6475 case elfcpp::R_AARCH64_PREL16
:
6476 case elfcpp::R_AARCH64_PREL32
:
6477 case elfcpp::R_AARCH64_PREL64
:
6478 // This is used to fill the GOT absolute address.
6479 if (gsym
->needs_plt_entry())
6481 target
->make_plt_entry(symtab
, layout
, gsym
);
6485 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6486 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6487 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6488 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6489 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6490 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6491 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6492 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6493 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6494 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6495 if (parameters
->options().output_is_position_independent())
6497 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6498 object
->name().c_str(), r_type
);
6500 // Make a PLT entry if necessary.
6501 if (gsym
->needs_plt_entry())
6503 target
->make_plt_entry(symtab
, layout
, gsym
);
6504 // Since this is not a PC-relative relocation, we may be
6505 // taking the address of a function. In that case we need to
6506 // set the entry in the dynamic symbol table to the address of
6508 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6509 gsym
->set_needs_dynsym_value();
6513 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6514 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6515 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6516 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6517 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6518 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6519 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6520 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6521 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6522 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6524 if (gsym
->needs_plt_entry())
6525 target
->make_plt_entry(symtab
, layout
, gsym
);
6526 // Make a dynamic relocation if necessary.
6527 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6529 if (parameters
->options().output_is_executable()
6530 && gsym
->may_need_copy_reloc())
6532 target
->copy_reloc(symtab
, layout
, object
,
6533 data_shndx
, output_section
, gsym
, rela
);
6539 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6540 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6541 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6543 // The above relocations are used to access GOT entries.
6544 // Note a GOT entry is an *address* to a symbol.
6545 // The symbol requires a GOT entry
6546 Output_data_got_aarch64
<size
, big_endian
>* got
=
6547 target
->got_section(symtab
, layout
);
6548 if (gsym
->final_value_is_known())
6550 // For a STT_GNU_IFUNC symbol we want the PLT address.
6551 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6552 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6554 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6558 // If this symbol is not fully resolved, we need to add a dynamic
6559 // relocation for it.
6560 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6562 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6564 // 1) The symbol may be defined in some other module.
6565 // 2) We are building a shared library and this is a protected
6566 // symbol; using GLOB_DAT means that the dynamic linker can use
6567 // the address of the PLT in the main executable when appropriate
6568 // so that function address comparisons work.
6569 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6570 // again so that function address comparisons work.
6571 if (gsym
->is_from_dynobj()
6572 || gsym
->is_undefined()
6573 || gsym
->is_preemptible()
6574 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6575 && parameters
->options().shared())
6576 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6577 && parameters
->options().output_is_position_independent()))
6578 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6579 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6582 // For a STT_GNU_IFUNC symbol we want to write the PLT
6583 // offset into the GOT, so that function pointer
6584 // comparisons work correctly.
6586 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6587 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6590 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6591 // Tell the dynamic linker to use the PLT address
6592 // when resolving relocations.
6593 if (gsym
->is_from_dynobj()
6594 && !parameters
->options().shared())
6595 gsym
->set_needs_dynsym_value();
6599 rela_dyn
->add_global_relative(
6600 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6602 gsym
->got_offset(GOT_TYPE_STANDARD
),
6611 case elfcpp::R_AARCH64_TSTBR14
:
6612 case elfcpp::R_AARCH64_CONDBR19
:
6613 case elfcpp::R_AARCH64_JUMP26
:
6614 case elfcpp::R_AARCH64_CALL26
:
6616 if (gsym
->final_value_is_known())
6619 if (gsym
->is_defined() &&
6620 !gsym
->is_from_dynobj() &&
6621 !gsym
->is_preemptible())
6624 // Make plt entry for function call.
6625 target
->make_plt_entry(symtab
, layout
, gsym
);
6629 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6630 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6632 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6633 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6634 if (tlsopt
== tls::TLSOPT_TO_LE
)
6636 layout
->set_has_static_tls();
6639 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6642 Output_data_got_aarch64
<size
, big_endian
>* got
=
6643 target
->got_section(symtab
, layout
);
6644 // Create 2 consecutive entries for module index and offset.
6645 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6646 target
->rela_dyn_section(layout
),
6647 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6648 elfcpp::R_AARCH64_TLS_DTPREL64
);
6652 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6653 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6655 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6656 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6657 if (tlsopt
== tls::TLSOPT_NONE
)
6659 // Create a GOT entry for the module index.
6660 target
->got_mod_index_entry(symtab
, layout
, object
);
6662 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6663 unsupported_reloc_local(object
, r_type
);
6667 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6668 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6669 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6670 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6673 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6674 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6676 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6677 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6678 if (tlsopt
== tls::TLSOPT_TO_LE
)
6681 layout
->set_has_static_tls();
6682 // Create a GOT entry for the tp-relative offset.
6683 Output_data_got_aarch64
<size
, big_endian
>* got
6684 = target
->got_section(symtab
, layout
);
6685 if (!parameters
->doing_static_link())
6687 got
->add_global_with_rel(
6688 gsym
, GOT_TYPE_TLS_OFFSET
,
6689 target
->rela_dyn_section(layout
),
6690 elfcpp::R_AARCH64_TLS_TPREL64
);
6692 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6694 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6695 unsigned int got_offset
=
6696 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6697 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6698 gold_assert(addend
== 0);
6699 got
->add_static_reloc(got_offset
,
6700 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6705 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6706 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6707 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6708 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6709 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6710 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6711 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6712 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6713 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12
:
6714 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC
:
6715 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12
:
6716 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC
:
6717 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12
:
6718 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC
:
6719 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12
:
6720 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC
: // Local executable
6721 layout
->set_has_static_tls();
6722 if (parameters
->options().shared())
6723 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6724 object
->name().c_str(), r_type
);
6727 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6728 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6729 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6731 target
->define_tls_base_symbol(symtab
, layout
);
6732 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6733 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6734 if (tlsopt
== tls::TLSOPT_NONE
)
6736 // Create reserved PLT and GOT entries for the resolver.
6737 target
->reserve_tlsdesc_entries(symtab
, layout
);
6739 // Create a double GOT entry with an R_AARCH64_TLSDESC
6740 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6741 // entry needs to be in an area in .got.plt, not .got. Call
6742 // got_section to make sure the section has been created.
6743 target
->got_section(symtab
, layout
);
6744 Output_data_got
<size
, big_endian
>* got
=
6745 target
->got_tlsdesc_section();
6746 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6747 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6748 elfcpp::R_AARCH64_TLSDESC
, 0);
6750 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6752 // Create a GOT entry for the tp-relative offset.
6753 Output_data_got
<size
, big_endian
>* got
6754 = target
->got_section(symtab
, layout
);
6755 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6756 target
->rela_dyn_section(layout
),
6757 elfcpp::R_AARCH64_TLS_TPREL64
);
6759 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6760 unsupported_reloc_global(object
, r_type
, gsym
);
6764 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6768 gold_error(_("%s: unsupported reloc type in global scan"),
6769 aarch64_reloc_property_table
->
6770 reloc_name_in_error_message(r_type
).c_str());
6773 } // End of Scan::global
6776 // Create the PLT section.
6777 template<int size
, bool big_endian
>
6779 Target_aarch64
<size
, big_endian
>::make_plt_section(
6780 Symbol_table
* symtab
, Layout
* layout
)
6782 if (this->plt_
== NULL
)
6784 // Create the GOT section first.
6785 this->got_section(symtab
, layout
);
6787 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6788 this->got_irelative_
);
6790 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6792 | elfcpp::SHF_EXECINSTR
),
6793 this->plt_
, ORDER_PLT
, false);
6795 // Make the sh_info field of .rela.plt point to .plt.
6796 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6797 rela_plt_os
->set_info_section(this->plt_
->output_section());
6801 // Return the section for TLSDESC relocations.
6803 template<int size
, bool big_endian
>
6804 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6805 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6807 return this->plt_section()->rela_tlsdesc(layout
);
6810 // Create a PLT entry for a global symbol.
6812 template<int size
, bool big_endian
>
6814 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6815 Symbol_table
* symtab
,
6819 if (gsym
->has_plt_offset())
6822 if (this->plt_
== NULL
)
6823 this->make_plt_section(symtab
, layout
);
6825 this->plt_
->add_entry(symtab
, layout
, gsym
);
6828 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6830 template<int size
, bool big_endian
>
6832 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6833 Symbol_table
* symtab
, Layout
* layout
,
6834 Sized_relobj_file
<size
, big_endian
>* relobj
,
6835 unsigned int local_sym_index
)
6837 if (relobj
->local_has_plt_offset(local_sym_index
))
6839 if (this->plt_
== NULL
)
6840 this->make_plt_section(symtab
, layout
);
6841 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6844 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6847 template<int size
, bool big_endian
>
6849 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6850 Symbol_table
* symtab
,
6852 Sized_relobj_file
<size
, big_endian
>* object
,
6853 unsigned int data_shndx
,
6854 unsigned int sh_type
,
6855 const unsigned char* prelocs
,
6857 Output_section
* output_section
,
6858 bool needs_special_offset_handling
,
6859 size_t local_symbol_count
,
6860 const unsigned char* plocal_symbols
)
6862 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6863 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6866 if (sh_type
== elfcpp::SHT_REL
)
6871 gold::gc_process_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6880 needs_special_offset_handling
,
6885 // Scan relocations for a section.
6887 template<int size
, bool big_endian
>
6889 Target_aarch64
<size
, big_endian
>::scan_relocs(
6890 Symbol_table
* symtab
,
6892 Sized_relobj_file
<size
, big_endian
>* object
,
6893 unsigned int data_shndx
,
6894 unsigned int sh_type
,
6895 const unsigned char* prelocs
,
6897 Output_section
* output_section
,
6898 bool needs_special_offset_handling
,
6899 size_t local_symbol_count
,
6900 const unsigned char* plocal_symbols
)
6902 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6903 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6906 if (sh_type
== elfcpp::SHT_REL
)
6908 gold_error(_("%s: unsupported REL reloc section"),
6909 object
->name().c_str());
6913 gold::scan_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6922 needs_special_offset_handling
,
6927 // Return the value to use for a dynamic which requires special
6928 // treatment. This is how we support equality comparisons of function
6929 // pointers across shared library boundaries, as described in the
6930 // processor specific ABI supplement.
6932 template<int size
, bool big_endian
>
6934 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6936 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6937 return this->plt_address_for_global(gsym
);
6941 // Finalize the sections.
6943 template<int size
, bool big_endian
>
6945 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6947 const Input_objects
*,
6948 Symbol_table
* symtab
)
6950 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6952 : this->plt_
->rela_plt());
6953 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6954 this->rela_dyn_
, true, false);
6956 // Emit any relocs we saved in an attempt to avoid generating COPY
6958 if (this->copy_relocs_
.any_saved_relocs())
6959 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6961 // Fill in some more dynamic tags.
6962 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6965 if (this->plt_
!= NULL
6966 && this->plt_
->output_section() != NULL
6967 && this->plt_
->has_tlsdesc_entry())
6969 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6970 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6971 this->got_
->finalize_data_size();
6972 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6973 this->plt_
, plt_offset
);
6974 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6975 this->got_
, got_offset
);
6979 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6980 // the .got section.
6981 Symbol
* sym
= this->global_offset_table_
;
6984 uint64_t data_size
= this->got_
->current_data_size();
6985 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6987 // If the .got section is more than 0x8000 bytes, we add
6988 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6989 // bit relocations have a greater chance of working.
6990 if (data_size
>= 0x8000)
6991 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6992 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6995 if (parameters
->doing_static_link()
6996 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6998 // If linking statically, make sure that the __rela_iplt symbols
6999 // were defined if necessary, even if we didn't create a PLT.
7000 static const Define_symbol_in_segment syms
[] =
7003 "__rela_iplt_start", // name
7004 elfcpp::PT_LOAD
, // segment_type
7005 elfcpp::PF_W
, // segment_flags_set
7006 elfcpp::PF(0), // segment_flags_clear
7009 elfcpp::STT_NOTYPE
, // type
7010 elfcpp::STB_GLOBAL
, // binding
7011 elfcpp::STV_HIDDEN
, // visibility
7013 Symbol::SEGMENT_START
, // offset_from_base
7017 "__rela_iplt_end", // name
7018 elfcpp::PT_LOAD
, // segment_type
7019 elfcpp::PF_W
, // segment_flags_set
7020 elfcpp::PF(0), // segment_flags_clear
7023 elfcpp::STT_NOTYPE
, // type
7024 elfcpp::STB_GLOBAL
, // binding
7025 elfcpp::STV_HIDDEN
, // visibility
7027 Symbol::SEGMENT_START
, // offset_from_base
7032 symtab
->define_symbols(layout
, 2, syms
,
7033 layout
->script_options()->saw_sections_clause());
7039 // Perform a relocation.
7041 template<int size
, bool big_endian
>
7043 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
7044 const Relocate_info
<size
, big_endian
>* relinfo
,
7046 Target_aarch64
<size
, big_endian
>* target
,
7049 const unsigned char* preloc
,
7050 const Sized_symbol
<size
>* gsym
,
7051 const Symbol_value
<size
>* psymval
,
7052 unsigned char* view
,
7053 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
7054 section_size_type
/* view_size */)
7059 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
7061 const elfcpp::Rela
<size
, big_endian
> rela(preloc
);
7062 unsigned int r_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
7063 const AArch64_reloc_property
* reloc_property
=
7064 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7066 if (reloc_property
== NULL
)
7068 std::string reloc_name
=
7069 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
7070 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7071 _("cannot relocate %s in object file"),
7072 reloc_name
.c_str());
7076 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7078 // Pick the value to use for symbols defined in the PLT.
7079 Symbol_value
<size
> symval
;
7081 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
7083 symval
.set_output_value(target
->plt_address_for_global(gsym
));
7086 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
7088 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7089 if (object
->local_has_plt_offset(r_sym
))
7091 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
7096 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7098 // Get the GOT offset if needed.
7099 // For aarch64, the GOT pointer points to the start of the GOT section.
7100 bool have_got_offset
= false;
7102 int got_base
= (target
->got_
!= NULL
7103 ? (target
->got_
->current_data_size() >= 0x8000
7108 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
7109 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
7110 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
7111 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
7112 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
7113 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
7114 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
7115 case elfcpp::R_AARCH64_GOTREL64
:
7116 case elfcpp::R_AARCH64_GOTREL32
:
7117 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
7118 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
7119 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7120 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7121 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7124 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
7125 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
7129 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7130 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
7131 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
7134 have_got_offset
= true;
7141 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
7142 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
7145 case elfcpp::R_AARCH64_NONE
:
7148 case elfcpp::R_AARCH64_ABS64
:
7149 if (!parameters
->options().apply_dynamic_relocs()
7150 && parameters
->options().output_is_position_independent()
7152 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags())
7153 && !gsym
->can_use_relative_reloc(false))
7154 // We have generated an absolute dynamic relocation, so do not
7155 // apply the relocation statically. (Works around bugs in older
7156 // Android dynamic linkers.)
7158 reloc_status
= Reloc::template rela_ua
<64>(
7159 view
, object
, psymval
, addend
, reloc_property
);
7162 case elfcpp::R_AARCH64_ABS32
:
7163 if (!parameters
->options().apply_dynamic_relocs()
7164 && parameters
->options().output_is_position_independent()
7166 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7167 // We have generated an absolute dynamic relocation, so do not
7168 // apply the relocation statically. (Works around bugs in older
7169 // Android dynamic linkers.)
7171 reloc_status
= Reloc::template rela_ua
<32>(
7172 view
, object
, psymval
, addend
, reloc_property
);
7175 case elfcpp::R_AARCH64_ABS16
:
7176 if (!parameters
->options().apply_dynamic_relocs()
7177 && parameters
->options().output_is_position_independent()
7179 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7180 // We have generated an absolute dynamic relocation, so do not
7181 // apply the relocation statically. (Works around bugs in older
7182 // Android dynamic linkers.)
7184 reloc_status
= Reloc::template rela_ua
<16>(
7185 view
, object
, psymval
, addend
, reloc_property
);
7188 case elfcpp::R_AARCH64_PREL64
:
7189 reloc_status
= Reloc::template pcrela_ua
<64>(
7190 view
, object
, psymval
, addend
, address
, reloc_property
);
7193 case elfcpp::R_AARCH64_PREL32
:
7194 reloc_status
= Reloc::template pcrela_ua
<32>(
7195 view
, object
, psymval
, addend
, address
, reloc_property
);
7198 case elfcpp::R_AARCH64_PREL16
:
7199 reloc_status
= Reloc::template pcrela_ua
<16>(
7200 view
, object
, psymval
, addend
, address
, reloc_property
);
7203 case elfcpp::R_AARCH64_MOVW_UABS_G0
:
7204 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
:
7205 case elfcpp::R_AARCH64_MOVW_UABS_G1
:
7206 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
:
7207 case elfcpp::R_AARCH64_MOVW_UABS_G2
:
7208 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
:
7209 case elfcpp::R_AARCH64_MOVW_UABS_G3
:
7210 reloc_status
= Reloc::template rela_general
<32>(
7211 view
, object
, psymval
, addend
, reloc_property
);
7213 case elfcpp::R_AARCH64_MOVW_SABS_G0
:
7214 case elfcpp::R_AARCH64_MOVW_SABS_G1
:
7215 case elfcpp::R_AARCH64_MOVW_SABS_G2
:
7216 reloc_status
= Reloc::movnz(view
, psymval
->value(object
, addend
),
7220 case elfcpp::R_AARCH64_LD_PREL_LO19
:
7221 reloc_status
= Reloc::template pcrela_general
<32>(
7222 view
, object
, psymval
, addend
, address
, reloc_property
);
7225 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
7226 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
7227 address
, reloc_property
);
7230 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
7231 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
7232 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
7236 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
7237 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
7238 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
7239 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
7240 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
7241 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
7242 reloc_status
= Reloc::template rela_general
<32>(
7243 view
, object
, psymval
, addend
, reloc_property
);
7246 case elfcpp::R_AARCH64_CALL26
:
7247 if (this->skip_call_tls_get_addr_
)
7249 // Double check that the TLSGD insn has been optimized away.
7250 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7251 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
7252 reinterpret_cast<Insntype
*>(view
));
7253 gold_assert((insn
& 0xff000000) == 0x91000000);
7255 reloc_status
= Reloc::STATUS_OKAY
;
7256 this->skip_call_tls_get_addr_
= false;
7257 // Return false to stop further processing this reloc.
7261 case elfcpp::R_AARCH64_JUMP26
:
7262 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
7263 gsym
, psymval
, object
,
7264 target
->stub_group_size_
))
7267 case elfcpp::R_AARCH64_TSTBR14
:
7268 case elfcpp::R_AARCH64_CONDBR19
:
7269 reloc_status
= Reloc::template pcrela_general
<32>(
7270 view
, object
, psymval
, addend
, address
, reloc_property
);
7273 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7274 gold_assert(have_got_offset
);
7275 value
= target
->got_
->address() + got_base
+ got_offset
;
7276 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
7279 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7280 gold_assert(have_got_offset
);
7281 value
= target
->got_
->address() + got_base
+ got_offset
;
7282 reloc_status
= Reloc::template rela_general
<32>(
7283 view
, value
, addend
, reloc_property
);
7286 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7288 gold_assert(have_got_offset
);
7289 value
= target
->got_
->address() + got_base
+ got_offset
+ addend
-
7290 Reloc::Page(target
->got_
->address() + got_base
);
7291 if ((value
& 7) != 0)
7292 reloc_status
= Reloc::STATUS_OVERFLOW
;
7294 reloc_status
= Reloc::template reloc_common
<32>(
7295 view
, value
, reloc_property
);
7299 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7300 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7301 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7302 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7303 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7304 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7305 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7306 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7307 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7308 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7309 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7310 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7311 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7312 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7313 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7314 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7315 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7316 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7317 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12
:
7318 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC
:
7319 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12
:
7320 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC
:
7321 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12
:
7322 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC
:
7323 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12
:
7324 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC
:
7325 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7326 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7327 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7328 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7329 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
7330 gsym
, psymval
, view
, address
);
7333 // These are dynamic relocations, which are unexpected when linking.
7334 case elfcpp::R_AARCH64_COPY
:
7335 case elfcpp::R_AARCH64_GLOB_DAT
:
7336 case elfcpp::R_AARCH64_JUMP_SLOT
:
7337 case elfcpp::R_AARCH64_RELATIVE
:
7338 case elfcpp::R_AARCH64_IRELATIVE
:
7339 case elfcpp::R_AARCH64_TLS_DTPREL64
:
7340 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
7341 case elfcpp::R_AARCH64_TLS_TPREL64
:
7342 case elfcpp::R_AARCH64_TLSDESC
:
7343 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7344 _("unexpected reloc %u in object file"),
7349 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7350 _("unsupported reloc %s"),
7351 reloc_property
->name().c_str());
7355 // Report any errors.
7356 switch (reloc_status
)
7358 case Reloc::STATUS_OKAY
:
7360 case Reloc::STATUS_OVERFLOW
:
7361 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7362 _("relocation overflow in %s"),
7363 reloc_property
->name().c_str());
7365 case Reloc::STATUS_BAD_RELOC
:
7366 gold_error_at_location(
7369 rela
.get_r_offset(),
7370 _("unexpected opcode while processing relocation %s"),
7371 reloc_property
->name().c_str());
7381 template<int size
, bool big_endian
>
7383 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7384 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
7385 const Relocate_info
<size
, big_endian
>* relinfo
,
7386 Target_aarch64
<size
, big_endian
>* target
,
7388 const elfcpp::Rela
<size
, big_endian
>& rela
,
7389 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
7390 const Symbol_value
<size
>* psymval
,
7391 unsigned char* view
,
7392 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7394 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7395 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7397 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7398 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7399 const AArch64_reloc_property
* reloc_property
=
7400 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7401 gold_assert(reloc_property
!= NULL
);
7403 const bool is_final
= (gsym
== NULL
7404 ? !parameters
->options().shared()
7405 : gsym
->final_value_is_known());
7406 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
7407 optimize_tls_reloc(is_final
, r_type
);
7409 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7410 int tls_got_offset_type
;
7413 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7414 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
7416 if (tlsopt
== tls::TLSOPT_TO_LE
)
7418 if (tls_segment
== NULL
)
7420 gold_assert(parameters
->errors()->error_count() > 0
7421 || issue_undefined_symbol_error(gsym
));
7422 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7424 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
7427 else if (tlsopt
== tls::TLSOPT_NONE
)
7429 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
7430 // Firstly get the address for the got entry.
7431 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7434 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7435 got_entry_address
= target
->got_
->address() +
7436 gsym
->got_offset(tls_got_offset_type
);
7440 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7442 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7443 got_entry_address
= target
->got_
->address() +
7444 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7447 // Relocate the address into adrp/ld, adrp/add pair.
7450 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7451 return aarch64_reloc_funcs::adrp(
7452 view
, got_entry_address
+ addend
, address
);
7456 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7457 return aarch64_reloc_funcs::template rela_general
<32>(
7458 view
, got_entry_address
, addend
, reloc_property
);
7465 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7466 _("unsupported gd_to_ie relaxation on %u"),
7471 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7472 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7474 if (tlsopt
== tls::TLSOPT_TO_LE
)
7476 if (tls_segment
== NULL
)
7478 gold_assert(parameters
->errors()->error_count() > 0
7479 || issue_undefined_symbol_error(gsym
));
7480 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7482 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7486 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7487 // Relocate the field with the offset of the GOT entry for
7488 // the module index.
7489 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7490 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7491 target
->got_
->address());
7495 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7496 return aarch64_reloc_funcs::adrp(
7497 view
, got_entry_address
+ addend
, address
);
7500 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7501 return aarch64_reloc_funcs::template rela_general
<32>(
7502 view
, got_entry_address
, addend
, reloc_property
);
7511 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7512 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7513 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7514 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7516 AArch64_address value
= psymval
->value(object
, 0);
7517 if (tlsopt
== tls::TLSOPT_TO_LE
)
7519 if (tls_segment
== NULL
)
7521 gold_assert(parameters
->errors()->error_count() > 0
7522 || issue_undefined_symbol_error(gsym
));
7523 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7528 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7529 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7533 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7534 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7535 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7536 return aarch64_reloc_funcs::template rela_general
<32>(
7537 view
, value
, addend
, reloc_property
);
7543 // We should never reach here.
7547 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7548 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7550 if (tlsopt
== tls::TLSOPT_TO_LE
)
7552 if (tls_segment
== NULL
)
7554 gold_assert(parameters
->errors()->error_count() > 0
7555 || issue_undefined_symbol_error(gsym
));
7556 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7558 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7561 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7563 // Firstly get the address for the got entry.
7564 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7567 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7568 got_entry_address
= target
->got_
->address() +
7569 gsym
->got_offset(tls_got_offset_type
);
7573 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7575 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7576 got_entry_address
= target
->got_
->address() +
7577 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7579 // Relocate the address into adrp/ld, adrp/add pair.
7582 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7583 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7586 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7587 return aarch64_reloc_funcs::template rela_general
<32>(
7588 view
, got_entry_address
, addend
, reloc_property
);
7593 // We shall never reach here.
7596 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7597 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7598 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7599 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7600 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7601 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7602 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7603 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7604 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12
:
7605 case elfcpp::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC
:
7606 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12
:
7607 case elfcpp::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC
:
7608 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12
:
7609 case elfcpp::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC
:
7610 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12
:
7611 case elfcpp::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC
:
7613 gold_assert(tls_segment
!= NULL
);
7614 AArch64_address value
= psymval
->value(object
, 0);
7616 if (!parameters
->options().shared())
7618 AArch64_address aligned_tcb_size
=
7619 align_address(target
->tcb_size(),
7620 tls_segment
->maximum_alignment());
7621 value
+= aligned_tcb_size
;
7624 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7625 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7626 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7627 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7630 return aarch64_reloc_funcs::template
7631 rela_general
<32>(view
,
7638 gold_error(_("%s: unsupported reloc %u "
7639 "in non-static TLSLE mode."),
7640 object
->name().c_str(), r_type
);
7644 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7645 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7646 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7647 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7649 if (tlsopt
== tls::TLSOPT_TO_LE
)
7651 if (tls_segment
== NULL
)
7653 gold_assert(parameters
->errors()->error_count() > 0
7654 || issue_undefined_symbol_error(gsym
));
7655 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7657 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7662 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7663 ? GOT_TYPE_TLS_OFFSET
7664 : GOT_TYPE_TLS_DESC
);
7665 int got_tlsdesc_offset
= 0;
7666 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7667 && tlsopt
== tls::TLSOPT_NONE
)
7669 // We created GOT entries in the .got.tlsdesc portion of the
7670 // .got.plt section, but the offset stored in the symbol is the
7671 // offset within .got.tlsdesc.
7672 got_tlsdesc_offset
= (target
->got_tlsdesc_
->address()
7673 - target
->got_
->address());
7675 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7678 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7679 got_entry_address
= target
->got_
->address()
7680 + got_tlsdesc_offset
7681 + gsym
->got_offset(tls_got_offset_type
);
7685 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7687 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7688 got_entry_address
= target
->got_
->address() +
7689 got_tlsdesc_offset
+
7690 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7692 if (tlsopt
== tls::TLSOPT_TO_IE
)
7694 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7695 view
, psymval
, got_entry_address
,
7699 // Now do tlsdesc relocation.
7702 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7703 return aarch64_reloc_funcs::adrp(view
,
7704 got_entry_address
+ addend
,
7707 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7708 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7709 return aarch64_reloc_funcs::template rela_general
<32>(
7710 view
, got_entry_address
, addend
, reloc_property
);
7712 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7713 return aarch64_reloc_funcs::STATUS_OKAY
;
7723 gold_error(_("%s: unsupported TLS reloc %u."),
7724 object
->name().c_str(), r_type
);
7726 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7727 } // End of relocate_tls.
7730 template<int size
, bool big_endian
>
7732 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7733 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7734 const Relocate_info
<size
, big_endian
>* relinfo
,
7735 Target_aarch64
<size
, big_endian
>* target
,
7736 const elfcpp::Rela
<size
, big_endian
>& rela
,
7737 unsigned int r_type
,
7738 unsigned char* view
,
7739 const Symbol_value
<size
>* psymval
)
7741 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7742 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7743 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7745 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7746 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7747 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7748 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7750 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7752 // This is the 2nd relocs, optimization should already have been
7754 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7755 return aarch64_reloc_funcs::STATUS_OKAY
;
7758 // The original sequence is -
7759 // 90000000 adrp x0, 0 <main>
7760 // 91000000 add x0, x0, #0x0
7761 // 94000000 bl 0 <__tls_get_addr>
7762 // optimized to sequence -
7763 // d53bd040 mrs x0, tpidr_el0
7764 // 91400000 add x0, x0, #0x0, lsl #12
7765 // 91000000 add x0, x0, #0x0
7767 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7768 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7769 // have to change "bl tls_get_addr", which does not have a corresponding tls
7770 // relocation type. So before proceeding, we need to make sure compiler
7771 // does not change the sequence.
7772 if(!(insn1
== 0x90000000 // adrp x0,0
7773 && insn2
== 0x91000000 // add x0, x0, #0x0
7774 && insn3
== 0x94000000)) // bl 0
7776 // Ideally we should give up gd_to_le relaxation and do gd access.
7777 // However the gd_to_le relaxation decision has been made early
7778 // in the scan stage, where we did not allocate any GOT entry for
7779 // this symbol. Therefore we have to exit and report error now.
7780 gold_error(_("unexpected reloc insn sequence while relaxing "
7781 "tls gd to le for reloc %u."), r_type
);
7782 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7786 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7787 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7788 insn3
= 0x91000000; // add x0, x0, #0x0
7789 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7790 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7791 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7793 // Calculate tprel value.
7794 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7795 gold_assert(tls_segment
!= NULL
);
7796 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7797 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7798 AArch64_address aligned_tcb_size
=
7799 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7800 AArch64_address x
= value
+ aligned_tcb_size
;
7802 // After new insns are written, apply TLSLE relocs.
7803 const AArch64_reloc_property
* rp1
=
7804 aarch64_reloc_property_table
->get_reloc_property(
7805 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7806 const AArch64_reloc_property
* rp2
=
7807 aarch64_reloc_property_table
->get_reloc_property(
7808 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7809 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7811 typename
aarch64_reloc_funcs::Status s1
=
7812 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7816 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7819 typename
aarch64_reloc_funcs::Status s2
=
7820 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7825 this->skip_call_tls_get_addr_
= true;
7827 } // End of tls_gd_to_le
7830 template<int size
, bool big_endian
>
7832 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7833 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7834 const Relocate_info
<size
, big_endian
>* relinfo
,
7835 Target_aarch64
<size
, big_endian
>* target
,
7836 const elfcpp::Rela
<size
, big_endian
>& rela
,
7837 unsigned int r_type
,
7838 unsigned char* view
,
7839 const Symbol_value
<size
>* psymval
)
7841 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7842 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7843 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7845 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7846 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7847 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7848 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7850 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7852 // This is the 2nd relocs, optimization should already have been
7854 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7855 return aarch64_reloc_funcs::STATUS_OKAY
;
7858 // The original sequence is -
7859 // 90000000 adrp x0, 0 <main>
7860 // 91000000 add x0, x0, #0x0
7861 // 94000000 bl 0 <__tls_get_addr>
7862 // optimized to sequence -
7863 // d53bd040 mrs x0, tpidr_el0
7864 // 91400000 add x0, x0, #0x0, lsl #12
7865 // 91000000 add x0, x0, #0x0
7867 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7868 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7869 // have to change "bl tls_get_addr", which does not have a corresponding tls
7870 // relocation type. So before proceeding, we need to make sure compiler
7871 // does not change the sequence.
7872 if(!(insn1
== 0x90000000 // adrp x0,0
7873 && insn2
== 0x91000000 // add x0, x0, #0x0
7874 && insn3
== 0x94000000)) // bl 0
7876 // Ideally we should give up gd_to_le relaxation and do gd access.
7877 // However the gd_to_le relaxation decision has been made early
7878 // in the scan stage, where we did not allocate a GOT entry for
7879 // this symbol. Therefore we have to exit and report an error now.
7880 gold_error(_("unexpected reloc insn sequence while relaxing "
7881 "tls gd to le for reloc %u."), r_type
);
7882 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7886 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7887 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7888 insn3
= 0x91000000; // add x0, x0, #0x0
7889 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7890 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7891 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7893 // Calculate tprel value.
7894 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7895 gold_assert(tls_segment
!= NULL
);
7896 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7897 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7898 AArch64_address aligned_tcb_size
=
7899 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7900 AArch64_address x
= value
+ aligned_tcb_size
;
7902 // After new insns are written, apply TLSLE relocs.
7903 const AArch64_reloc_property
* rp1
=
7904 aarch64_reloc_property_table
->get_reloc_property(
7905 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7906 const AArch64_reloc_property
* rp2
=
7907 aarch64_reloc_property_table
->get_reloc_property(
7908 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7909 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7911 typename
aarch64_reloc_funcs::Status s1
=
7912 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7916 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7919 typename
aarch64_reloc_funcs::Status s2
=
7920 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7925 this->skip_call_tls_get_addr_
= true;
7928 } // End of tls_ld_to_le
7930 template<int size
, bool big_endian
>
7932 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7933 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7934 const Relocate_info
<size
, big_endian
>* relinfo
,
7935 Target_aarch64
<size
, big_endian
>* target
,
7936 const elfcpp::Rela
<size
, big_endian
>& rela
,
7937 unsigned int r_type
,
7938 unsigned char* view
,
7939 const Symbol_value
<size
>* psymval
)
7941 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7942 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7943 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7945 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7946 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7947 AArch64_address aligned_tcb_address
=
7948 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7949 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7950 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7951 // "x" is the offset to tp, we can only do this if x is within
7952 // range [0, 2^32-1]
7953 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7955 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7957 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7960 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7961 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7964 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7967 regno
= (insn
& 0x1f);
7968 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7970 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7973 regno
= (insn
& 0x1f);
7974 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7975 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7980 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7981 return aarch64_reloc_funcs::STATUS_OKAY
;
7982 } // End of tls_ie_to_le
7985 template<int size
, bool big_endian
>
7987 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7988 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7989 const Relocate_info
<size
, big_endian
>* relinfo
,
7990 Target_aarch64
<size
, big_endian
>* target
,
7991 const elfcpp::Rela
<size
, big_endian
>& rela
,
7992 unsigned int r_type
,
7993 unsigned char* view
,
7994 const Symbol_value
<size
>* psymval
)
7996 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7997 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7998 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
8000 // TLSDESC-GD sequence is like:
8001 // adrp x0, :tlsdesc:v1
8002 // ldr x1, [x0, #:tlsdesc_lo12:v1]
8003 // add x0, x0, :tlsdesc_lo12:v1
8006 // After desc_gd_to_le optimization, the sequence will be like:
8007 // movz x0, #0x0, lsl #16
8012 // Calculate tprel value.
8013 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
8014 gold_assert(tls_segment
!= NULL
);
8015 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
8016 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
8017 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
8018 AArch64_address aligned_tcb_size
=
8019 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
8020 AArch64_address x
= value
+ aligned_tcb_size
;
8021 // x is the offset to tp, we can only do this if x is within range
8022 // [0, 2^32-1]. If x is out of range, fail and exit.
8023 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
8025 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
8026 "We Can't do gd_to_le relaxation.\n"), r_type
);
8027 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
8032 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
8033 case elfcpp::R_AARCH64_TLSDESC_CALL
:
8035 newinsn
= 0xd503201f;
8038 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
8040 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
8043 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
8045 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
8049 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
8053 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
8054 return aarch64_reloc_funcs::STATUS_OKAY
;
8055 } // End of tls_desc_gd_to_le
8058 template<int size
, bool big_endian
>
8060 typename AArch64_relocate_functions
<size
, big_endian
>::Status
8061 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
8062 const Relocate_info
<size
, big_endian
>* /* relinfo */,
8063 Target_aarch64
<size
, big_endian
>* /* target */,
8064 const elfcpp::Rela
<size
, big_endian
>& rela
,
8065 unsigned int r_type
,
8066 unsigned char* view
,
8067 const Symbol_value
<size
>* /* psymval */,
8068 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
8069 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
8071 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
8072 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
8074 // TLSDESC-GD sequence is like:
8075 // adrp x0, :tlsdesc:v1
8076 // ldr x1, [x0, #:tlsdesc_lo12:v1]
8077 // add x0, x0, :tlsdesc_lo12:v1
8080 // After desc_gd_to_ie optimization, the sequence will be like:
8081 // adrp x0, :tlsie:v1
8082 // ldr x0, [x0, :tlsie_lo12:v1]
8086 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
8087 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
8091 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
8092 case elfcpp::R_AARCH64_TLSDESC_CALL
:
8094 newinsn
= 0xd503201f;
8095 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
8098 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
8100 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
8105 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
8107 // Set ldr target register to be x0.
8108 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
8110 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
8112 const AArch64_reloc_property
* reloc_property
=
8113 aarch64_reloc_property_table
->get_reloc_property(
8114 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
8115 return aarch64_reloc_funcs::template rela_general
<32>(
8116 view
, got_entry_address
, addend
, reloc_property
);
8121 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
8125 return aarch64_reloc_funcs::STATUS_OKAY
;
8126 } // End of tls_desc_gd_to_ie
8128 // Relocate section data.
8130 template<int size
, bool big_endian
>
8132 Target_aarch64
<size
, big_endian
>::relocate_section(
8133 const Relocate_info
<size
, big_endian
>* relinfo
,
8134 unsigned int sh_type
,
8135 const unsigned char* prelocs
,
8137 Output_section
* output_section
,
8138 bool needs_special_offset_handling
,
8139 unsigned char* view
,
8140 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
8141 section_size_type view_size
,
8142 const Reloc_symbol_changes
* reloc_symbol_changes
)
8144 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
8145 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
8146 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
8147 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8150 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8152 // See if we are relocating a relaxed input section. If so, the view
8153 // covers the whole output section and we need to adjust accordingly.
8154 if (needs_special_offset_handling
)
8156 const Output_relaxed_input_section
* poris
=
8157 output_section
->find_relaxed_input_section(relinfo
->object
,
8158 relinfo
->data_shndx
);
8161 Address section_address
= poris
->address();
8162 section_size_type section_size
= poris
->data_size();
8164 gold_assert((section_address
>= address
)
8165 && ((section_address
+ section_size
)
8166 <= (address
+ view_size
)));
8168 off_t offset
= section_address
- address
;
8171 view_size
= section_size
;
8175 gold::relocate_section
<size
, big_endian
, Aarch64
, AArch64_relocate
,
8176 gold::Default_comdat_behavior
, Classify_reloc
>(
8182 needs_special_offset_handling
,
8186 reloc_symbol_changes
);
8189 // Scan the relocs during a relocatable link.
8191 template<int size
, bool big_endian
>
8193 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
8194 Symbol_table
* symtab
,
8196 Sized_relobj_file
<size
, big_endian
>* object
,
8197 unsigned int data_shndx
,
8198 unsigned int sh_type
,
8199 const unsigned char* prelocs
,
8201 Output_section
* output_section
,
8202 bool needs_special_offset_handling
,
8203 size_t local_symbol_count
,
8204 const unsigned char* plocal_symbols
,
8205 Relocatable_relocs
* rr
)
8207 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8209 typedef gold::Default_scan_relocatable_relocs
<Classify_reloc
>
8210 Scan_relocatable_relocs
;
8212 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8214 gold::scan_relocatable_relocs
<size
, big_endian
, Scan_relocatable_relocs
>(
8222 needs_special_offset_handling
,
8228 // Scan the relocs for --emit-relocs.
8230 template<int size
, bool big_endian
>
8232 Target_aarch64
<size
, big_endian
>::emit_relocs_scan(
8233 Symbol_table
* symtab
,
8235 Sized_relobj_file
<size
, big_endian
>* object
,
8236 unsigned int data_shndx
,
8237 unsigned int sh_type
,
8238 const unsigned char* prelocs
,
8240 Output_section
* output_section
,
8241 bool needs_special_offset_handling
,
8242 size_t local_symbol_count
,
8243 const unsigned char* plocal_syms
,
8244 Relocatable_relocs
* rr
)
8246 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8248 typedef gold::Default_emit_relocs_strategy
<Classify_reloc
>
8249 Emit_relocs_strategy
;
8251 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8253 gold::scan_relocatable_relocs
<size
, big_endian
, Emit_relocs_strategy
>(
8261 needs_special_offset_handling
,
8267 // Relocate a section during a relocatable link.
8269 template<int size
, bool big_endian
>
8271 Target_aarch64
<size
, big_endian
>::relocate_relocs(
8272 const Relocate_info
<size
, big_endian
>* relinfo
,
8273 unsigned int sh_type
,
8274 const unsigned char* prelocs
,
8276 Output_section
* output_section
,
8277 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
8278 unsigned char* view
,
8279 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
8280 section_size_type view_size
,
8281 unsigned char* reloc_view
,
8282 section_size_type reloc_view_size
)
8284 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8287 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8289 gold::relocate_relocs
<size
, big_endian
, Classify_reloc
>(
8294 offset_in_output_section
,
8303 // Return whether this is a 3-insn erratum sequence.
8305 template<int size
, bool big_endian
>
8307 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
8308 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8309 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
8310 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
8315 // The 2nd insn is a single register load or store; or register pair
8317 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
8318 && (!pair
|| (pair
&& !load
)))
8320 // The 3rd insn is a load or store instruction from the "Load/store
8321 // register (unsigned immediate)" encoding class, using Rn as the
8322 // base address register.
8323 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
8324 && (Insn_utilities::aarch64_rn(insn3
)
8325 == Insn_utilities::aarch64_rd(insn1
)))
8332 // Return whether this is a 835769 sequence.
8333 // (Similarly implemented as in elfnn-aarch64.c.)
8335 template<int size
, bool big_endian
>
8337 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
8338 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8339 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
8349 if (Insn_utilities::aarch64_mlxl(insn2
)
8350 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
8352 /* Any SIMD memory op is independent of the subsequent MLA
8353 by definition of the erratum. */
8354 if (Insn_utilities::aarch64_bit(insn1
, 26))
8357 /* If not SIMD, check for integer memory ops and MLA relationship. */
8358 rn
= Insn_utilities::aarch64_rn(insn2
);
8359 ra
= Insn_utilities::aarch64_ra(insn2
);
8360 rm
= Insn_utilities::aarch64_rm(insn2
);
8362 /* If this is a load and there's a true(RAW) dependency, we are safe
8363 and this is not an erratum sequence. */
8365 (rt
== rn
|| rt
== rm
|| rt
== ra
8366 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
8369 /* We conservatively put out stubs for all other cases (including
8378 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8380 template<int size
, bool big_endian
>
8382 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
8383 AArch64_relobj
<size
, big_endian
>* relobj
,
8385 section_size_type erratum_insn_offset
,
8386 Address erratum_address
,
8387 typename
Insn_utilities::Insntype erratum_insn
,
8389 unsigned int e843419_adrp_offset
)
8391 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
8392 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
8393 gold_assert(stub_table
!= NULL
);
8394 if (stub_table
->find_erratum_stub(relobj
,
8396 erratum_insn_offset
) == NULL
)
8398 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8399 The_erratum_stub
* stub
;
8400 if (erratum_type
== ST_E_835769
)
8401 stub
= new The_erratum_stub(relobj
, erratum_type
, shndx
,
8402 erratum_insn_offset
);
8403 else if (erratum_type
== ST_E_843419
)
8404 stub
= new E843419_stub
<size
, big_endian
>(
8405 relobj
, shndx
, erratum_insn_offset
, e843419_adrp_offset
);
8408 stub
->set_erratum_insn(erratum_insn
);
8409 stub
->set_erratum_address(erratum_address
);
8410 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8411 // always the next insn after erratum insn.
8412 stub
->set_destination_address(erratum_address
+ BPI
);
8413 stub_table
->add_erratum_stub(stub
);
8418 // Scan erratum for section SHNDX range [output_address + span_start,
8419 // output_address + span_end). Note here we do not share the code with
8420 // scan_erratum_843419_span function, because for 843419 we optimize by only
8421 // scanning the last few insns of a page, whereas for 835769, we need to scan
8424 template<int size
, bool big_endian
>
8426 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
8427 AArch64_relobj
<size
, big_endian
>* relobj
,
8429 const section_size_type span_start
,
8430 const section_size_type span_end
,
8431 unsigned char* input_view
,
8432 Address output_address
)
8434 typedef typename
Insn_utilities::Insntype Insntype
;
8436 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8438 // Adjust output_address and view to the start of span.
8439 output_address
+= span_start
;
8440 input_view
+= span_start
;
8442 section_size_type span_length
= span_end
- span_start
;
8443 section_size_type offset
= 0;
8444 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
8446 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8447 Insntype insn1
= ip
[0];
8448 Insntype insn2
= ip
[1];
8449 if (is_erratum_835769_sequence(insn1
, insn2
))
8451 Insntype erratum_insn
= insn2
;
8452 // "span_start + offset" is the offset for insn1. So for insn2, it is
8453 // "span_start + offset + BPI".
8454 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
8455 Address erratum_address
= output_address
+ offset
+ BPI
;
8456 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8457 "section %d, offset 0x%08x."),
8458 relobj
->name().c_str(), shndx
,
8459 (unsigned int)(span_start
+ offset
));
8461 this->create_erratum_stub(relobj
, shndx
,
8462 erratum_insn_offset
, erratum_address
,
8463 erratum_insn
, ST_E_835769
);
8464 offset
+= BPI
; // Skip mac insn.
8467 } // End of "Target_aarch64::scan_erratum_835769_span".
8470 // Scan erratum for section SHNDX range
8471 // [output_address + span_start, output_address + span_end).
8473 template<int size
, bool big_endian
>
8475 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
8476 AArch64_relobj
<size
, big_endian
>* relobj
,
8478 const section_size_type span_start
,
8479 const section_size_type span_end
,
8480 unsigned char* input_view
,
8481 Address output_address
)
8483 typedef typename
Insn_utilities::Insntype Insntype
;
8485 // Adjust output_address and view to the start of span.
8486 output_address
+= span_start
;
8487 input_view
+= span_start
;
8489 if ((output_address
& 0x03) != 0)
8492 section_size_type offset
= 0;
8493 section_size_type span_length
= span_end
- span_start
;
8494 // The first instruction must be ending at 0xFF8 or 0xFFC.
8495 unsigned int page_offset
= output_address
& 0xFFF;
8496 // Make sure starting position, that is "output_address+offset",
8497 // starts at page position 0xff8 or 0xffc.
8498 if (page_offset
< 0xff8)
8499 offset
= 0xff8 - page_offset
;
8500 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8502 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8503 Insntype insn1
= ip
[0];
8504 if (Insn_utilities::is_adrp(insn1
))
8506 Insntype insn2
= ip
[1];
8507 Insntype insn3
= ip
[2];
8508 Insntype erratum_insn
;
8509 unsigned insn_offset
;
8510 bool do_report
= false;
8511 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
8514 erratum_insn
= insn3
;
8515 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
8517 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8519 // Optionally we can have an insn between ins2 and ins3
8520 Insntype insn_opt
= ip
[2];
8521 // And insn_opt must not be a branch.
8522 if (!Insn_utilities::aarch64_b(insn_opt
)
8523 && !Insn_utilities::aarch64_bl(insn_opt
)
8524 && !Insn_utilities::aarch64_blr(insn_opt
)
8525 && !Insn_utilities::aarch64_br(insn_opt
))
8527 // And insn_opt must not write to dest reg in insn1. However
8528 // we do a conservative scan, which means we may fix/report
8529 // more than necessary, but it doesn't hurt.
8531 Insntype insn4
= ip
[3];
8532 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8535 erratum_insn
= insn4
;
8536 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8542 unsigned int erratum_insn_offset
=
8543 span_start
+ offset
+ insn_offset
;
8544 Address erratum_address
=
8545 output_address
+ offset
+ insn_offset
;
8546 create_erratum_stub(relobj
, shndx
,
8547 erratum_insn_offset
, erratum_address
,
8548 erratum_insn
, ST_E_843419
,
8549 span_start
+ offset
);
8553 // Advance to next candidate instruction. We only consider instruction
8554 // sequences starting at a page offset of 0xff8 or 0xffc.
8555 page_offset
= (output_address
+ offset
) & 0xfff;
8556 if (page_offset
== 0xff8)
8558 else // (page_offset == 0xffc), we move to next page's 0xff8.
8561 } // End of "Target_aarch64::scan_erratum_843419_span".
8564 // The selector for aarch64 object files.
8566 template<int size
, bool big_endian
>
8567 class Target_selector_aarch64
: public Target_selector
8570 Target_selector_aarch64();
8573 do_instantiate_target()
8574 { return new Target_aarch64
<size
, big_endian
>(); }
8578 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8579 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8580 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8584 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8585 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8586 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8590 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8591 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8592 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8596 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8597 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8598 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8601 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8602 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8603 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8604 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8606 } // End anonymous namespace.