1 // aarch64.cc -- aarch64 target support for gold.
3 // Copyright (C) 2014-2018 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
)) >> 12;
1186 return adrp_imm
>= MIN_ADRP_IMM
&& adrp_imm
<= MAX_ADRP_IMM
;
1189 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1192 stub_type_for_reloc(unsigned int r_type
, AArch64_address address
,
1193 AArch64_address target
);
1195 Reloc_stub(int type
)
1196 : Stub_base
<size
, big_endian
>(type
)
1202 // The key class used to index the stub instance in the stub table's stub map.
1206 Key(int type
, const Symbol
* symbol
, const Relobj
* relobj
,
1207 unsigned int r_sym
, int32_t addend
)
1208 : type_(type
), addend_(addend
)
1212 this->r_sym_
= Reloc_stub::invalid_index
;
1213 this->u_
.symbol
= symbol
;
1217 gold_assert(relobj
!= NULL
&& r_sym
!= invalid_index
);
1218 this->r_sym_
= r_sym
;
1219 this->u_
.relobj
= relobj
;
1226 // Return stub type.
1229 { return this->type_
; }
1231 // Return the local symbol index or invalid_index.
1234 { return this->r_sym_
; }
1236 // Return the symbol if there is one.
1239 { return this->r_sym_
== invalid_index
? this->u_
.symbol
: NULL
; }
1241 // Return the relobj if there is one.
1244 { return this->r_sym_
!= invalid_index
? this->u_
.relobj
: NULL
; }
1246 // Whether this equals to another key k.
1248 eq(const Key
& k
) const
1250 return ((this->type_
== k
.type_
)
1251 && (this->r_sym_
== k
.r_sym_
)
1252 && ((this->r_sym_
!= Reloc_stub::invalid_index
)
1253 ? (this->u_
.relobj
== k
.u_
.relobj
)
1254 : (this->u_
.symbol
== k
.u_
.symbol
))
1255 && (this->addend_
== k
.addend_
));
1258 // Return a hash value.
1262 size_t name_hash_value
= gold::string_hash
<char>(
1263 (this->r_sym_
!= Reloc_stub::invalid_index
)
1264 ? this->u_
.relobj
->name().c_str()
1265 : this->u_
.symbol
->name());
1266 // We only have 4 stub types.
1267 size_t stub_type_hash_value
= 0x03 & this->type_
;
1268 return (name_hash_value
1269 ^ stub_type_hash_value
1270 ^ ((this->r_sym_
& 0x3fff) << 2)
1271 ^ ((this->addend_
& 0xffff) << 16));
1274 // Functors for STL associative containers.
1278 operator()(const Key
& k
) const
1279 { return k
.hash_value(); }
1285 operator()(const Key
& k1
, const Key
& k2
) const
1286 { return k1
.eq(k2
); }
1292 // If this is a local symbol, this is the index in the defining object.
1293 // Otherwise, it is invalid_index for a global symbol.
1294 unsigned int r_sym_
;
1295 // If r_sym_ is an invalid index, this points to a global symbol.
1296 // Otherwise, it points to a relobj. We used the unsized and target
1297 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1298 // Arm_relobj, in order to avoid making the stub class a template
1299 // as most of the stub machinery is endianness-neutral. However, it
1300 // may require a bit of casting done by users of this class.
1303 const Symbol
* symbol
;
1304 const Relobj
* relobj
;
1306 // Addend associated with a reloc.
1308 }; // End of inner class Reloc_stub::Key
1311 // This may be overridden in the child class.
1313 do_write(unsigned char*, section_size_type
);
1316 static const unsigned int invalid_index
= static_cast<unsigned int>(-1);
1317 }; // End of Reloc_stub
1319 template<int size
, bool big_endian
>
1320 const int Reloc_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1322 // Write data to output file.
1324 template<int size
, bool big_endian
>
1326 Reloc_stub
<size
, big_endian
>::
1327 do_write(unsigned char* view
, section_size_type
)
1329 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1330 const uint32_t* insns
= this->insns();
1331 uint32_t num_insns
= this->insn_num();
1332 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1333 for (uint32_t i
= 0; i
< num_insns
; ++i
)
1334 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1338 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1341 template<int size
, bool big_endian
>
1343 Reloc_stub
<size
, big_endian
>::stub_type_for_reloc(
1344 unsigned int r_type
, AArch64_address location
, AArch64_address dest
)
1346 int64_t branch_offset
= 0;
1349 case elfcpp::R_AARCH64_CALL26
:
1350 case elfcpp::R_AARCH64_JUMP26
:
1351 branch_offset
= dest
- location
;
1357 if (aarch64_valid_branch_offset_p(branch_offset
))
1360 if (aarch64_valid_for_adrp_p(location
, dest
))
1361 return ST_ADRP_BRANCH
;
1363 // Always use PC-relative addressing in case of -shared or -pie.
1364 if (parameters
->options().output_is_position_independent())
1365 return ST_LONG_BRANCH_PCREL
;
1367 // This saves 2 insns per stub, compared to ST_LONG_BRANCH_PCREL.
1368 // But is only applicable to non-shared or non-pie.
1369 return ST_LONG_BRANCH_ABS
;
1372 // A class to hold stubs for the ARM target. This contains 2 different types of
1373 // stubs - reloc stubs and erratum stubs.
1375 template<int size
, bool big_endian
>
1376 class Stub_table
: public Output_data
1379 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1380 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1381 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
1382 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1383 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
1384 typedef typename
The_reloc_stub::Key The_reloc_stub_key
;
1385 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1386 typedef Erratum_stub_less
<size
, big_endian
> The_erratum_stub_less
;
1387 typedef typename
The_reloc_stub_key::hash The_reloc_stub_key_hash
;
1388 typedef typename
The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to
;
1389 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1390 typedef Unordered_map
<The_reloc_stub_key
, The_reloc_stub
*,
1391 The_reloc_stub_key_hash
, The_reloc_stub_key_equal_to
>
1393 typedef typename
Reloc_stub_map::const_iterator Reloc_stub_map_const_iter
;
1394 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
1396 typedef std::set
<The_erratum_stub
*, The_erratum_stub_less
> Erratum_stub_set
;
1397 typedef typename
Erratum_stub_set::iterator Erratum_stub_set_iter
;
1399 Stub_table(The_aarch64_input_section
* owner
)
1400 : Output_data(), owner_(owner
), reloc_stubs_size_(0),
1401 erratum_stubs_size_(0), prev_data_size_(0)
1407 The_aarch64_input_section
*
1411 // Whether this stub table is empty.
1414 { return reloc_stubs_
.empty() && erratum_stubs_
.empty(); }
1416 // Return the current data size.
1418 current_data_size() const
1419 { return this->current_data_size_for_child(); }
1421 // Add a STUB using KEY. The caller is responsible for avoiding addition
1422 // if a STUB with the same key has already been added.
1424 add_reloc_stub(The_reloc_stub
* stub
, const The_reloc_stub_key
& key
);
1426 // Add an erratum stub into the erratum stub set. The set is ordered by
1427 // (relobj, shndx, sh_offset).
1429 add_erratum_stub(The_erratum_stub
* stub
);
1431 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1433 find_erratum_stub(The_aarch64_relobj
* a64relobj
,
1434 unsigned int shndx
, unsigned int sh_offset
);
1436 // Find all the erratums for a given input section. The return value is a pair
1437 // of iterators [begin, end).
1438 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1439 find_erratum_stubs_for_input_section(The_aarch64_relobj
* a64relobj
,
1440 unsigned int shndx
);
1442 // Compute the erratum stub address.
1444 erratum_stub_address(The_erratum_stub
* stub
) const
1446 AArch64_address r
= align_address(this->address() + this->reloc_stubs_size_
,
1447 The_erratum_stub::STUB_ADDR_ALIGN
);
1448 r
+= stub
->offset();
1452 // Finalize stubs. No-op here, just for completeness.
1457 // Look up a relocation stub using KEY. Return NULL if there is none.
1459 find_reloc_stub(The_reloc_stub_key
& key
)
1461 Reloc_stub_map_const_iter p
= this->reloc_stubs_
.find(key
);
1462 return (p
!= this->reloc_stubs_
.end()) ? p
->second
: NULL
;
1465 // Relocate reloc stubs in this stub table. This does not relocate erratum stubs.
1467 relocate_reloc_stubs(const The_relocate_info
*,
1468 The_target_aarch64
*,
1474 // Relocate an erratum stub.
1476 relocate_erratum_stub(The_erratum_stub
*, unsigned char*);
1478 // Update data size at the end of a relaxation pass. Return true if data size
1479 // is different from that of the previous relaxation pass.
1481 update_data_size_changed_p()
1483 // No addralign changed here.
1484 off_t s
= align_address(this->reloc_stubs_size_
,
1485 The_erratum_stub::STUB_ADDR_ALIGN
)
1486 + this->erratum_stubs_size_
;
1487 bool changed
= (s
!= this->prev_data_size_
);
1488 this->prev_data_size_
= s
;
1493 // Write out section contents.
1495 do_write(Output_file
*);
1497 // Return the required alignment.
1499 do_addralign() const
1501 return std::max(The_reloc_stub::STUB_ADDR_ALIGN
,
1502 The_erratum_stub::STUB_ADDR_ALIGN
);
1505 // Reset address and file offset.
1507 do_reset_address_and_file_offset()
1508 { this->set_current_data_size_for_child(this->prev_data_size_
); }
1510 // Set final data size.
1512 set_final_data_size()
1513 { this->set_data_size(this->current_data_size()); }
1516 // Relocate one reloc stub.
1518 relocate_reloc_stub(The_reloc_stub
*,
1519 const The_relocate_info
*,
1520 The_target_aarch64
*,
1527 // Owner of this stub table.
1528 The_aarch64_input_section
* owner_
;
1529 // The relocation stubs.
1530 Reloc_stub_map reloc_stubs_
;
1531 // The erratum stubs.
1532 Erratum_stub_set erratum_stubs_
;
1533 // Size of reloc stubs.
1534 off_t reloc_stubs_size_
;
1535 // Size of erratum stubs.
1536 off_t erratum_stubs_size_
;
1537 // data size of this in the previous pass.
1538 off_t prev_data_size_
;
1539 }; // End of Stub_table
1542 // Add an erratum stub into the erratum stub set. The set is ordered by
1543 // (relobj, shndx, sh_offset).
1545 template<int size
, bool big_endian
>
1547 Stub_table
<size
, big_endian
>::add_erratum_stub(The_erratum_stub
* stub
)
1549 std::pair
<Erratum_stub_set_iter
, bool> ret
=
1550 this->erratum_stubs_
.insert(stub
);
1551 gold_assert(ret
.second
);
1552 this->erratum_stubs_size_
= align_address(
1553 this->erratum_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1554 stub
->set_offset(this->erratum_stubs_size_
);
1555 this->erratum_stubs_size_
+= stub
->stub_size();
1559 // Find if such erratum exists for given (obj, shndx, sh_offset).
1561 template<int size
, bool big_endian
>
1562 Erratum_stub
<size
, big_endian
>*
1563 Stub_table
<size
, big_endian
>::find_erratum_stub(
1564 The_aarch64_relobj
* a64relobj
, unsigned int shndx
, unsigned int sh_offset
)
1566 // A dummy object used as key to search in the set.
1567 The_erratum_stub
key(a64relobj
, ST_NONE
,
1569 Erratum_stub_set_iter i
= this->erratum_stubs_
.find(&key
);
1570 if (i
!= this->erratum_stubs_
.end())
1572 The_erratum_stub
* stub(*i
);
1573 gold_assert(stub
->erratum_insn() != 0);
1580 // Find all the errata for a given input section. The return value is a pair of
1581 // iterators [begin, end).
1583 template<int size
, bool big_endian
>
1584 std::pair
<typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
,
1585 typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
>
1586 Stub_table
<size
, big_endian
>::find_erratum_stubs_for_input_section(
1587 The_aarch64_relobj
* a64relobj
, unsigned int shndx
)
1589 typedef std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
> Result_pair
;
1590 Erratum_stub_set_iter start
, end
;
1591 The_erratum_stub
low_key(a64relobj
, ST_NONE
, shndx
, 0);
1592 start
= this->erratum_stubs_
.lower_bound(&low_key
);
1593 if (start
== this->erratum_stubs_
.end())
1594 return Result_pair(this->erratum_stubs_
.end(),
1595 this->erratum_stubs_
.end());
1597 while (end
!= this->erratum_stubs_
.end() &&
1598 (*end
)->relobj() == a64relobj
&& (*end
)->shndx() == shndx
)
1600 return Result_pair(start
, end
);
1604 // Add a STUB using KEY. The caller is responsible for avoiding addition
1605 // if a STUB with the same key has already been added.
1607 template<int size
, bool big_endian
>
1609 Stub_table
<size
, big_endian
>::add_reloc_stub(
1610 The_reloc_stub
* stub
, const The_reloc_stub_key
& key
)
1612 gold_assert(stub
->type() == key
.type());
1613 this->reloc_stubs_
[key
] = stub
;
1615 // Assign stub offset early. We can do this because we never remove
1616 // reloc stubs and they are in the beginning of the stub table.
1617 this->reloc_stubs_size_
= align_address(this->reloc_stubs_size_
,
1618 The_reloc_stub::STUB_ADDR_ALIGN
);
1619 stub
->set_offset(this->reloc_stubs_size_
);
1620 this->reloc_stubs_size_
+= stub
->stub_size();
1624 // Relocate an erratum stub.
1626 template<int size
, bool big_endian
>
1628 Stub_table
<size
, big_endian
>::
1629 relocate_erratum_stub(The_erratum_stub
* estub
,
1630 unsigned char* view
)
1632 // Just for convenience.
1633 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1635 gold_assert(!estub
->is_invalidated_erratum_stub());
1636 AArch64_address stub_address
= this->erratum_stub_address(estub
);
1637 // The address of "b" in the stub that is to be "relocated".
1638 AArch64_address stub_b_insn_address
;
1639 // Branch offset that is to be filled in "b" insn.
1641 switch (estub
->type())
1645 // The 1st insn of the erratum could be a relocation spot,
1646 // in this case we need to fix it with
1647 // "(*i)->erratum_insn()".
1648 elfcpp::Swap
<32, big_endian
>::writeval(
1649 view
+ (stub_address
- this->address()),
1650 estub
->erratum_insn());
1651 // For the erratum, the 2nd insn is a b-insn to be patched
1653 stub_b_insn_address
= stub_address
+ 1 * BPI
;
1654 b_offset
= estub
->destination_address() - stub_b_insn_address
;
1655 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1656 view
+ (stub_b_insn_address
- this->address()),
1657 ((unsigned int)(b_offset
)) & 0xfffffff);
1663 estub
->invalidate_erratum_stub();
1667 // Relocate only reloc stubs in this stub table. This does not relocate erratum
1670 template<int size
, bool big_endian
>
1672 Stub_table
<size
, big_endian
>::
1673 relocate_reloc_stubs(const The_relocate_info
* relinfo
,
1674 The_target_aarch64
* target_aarch64
,
1675 Output_section
* output_section
,
1676 unsigned char* view
,
1677 AArch64_address address
,
1678 section_size_type view_size
)
1680 // "view_size" is the total size of the stub_table.
1681 gold_assert(address
== this->address() &&
1682 view_size
== static_cast<section_size_type
>(this->data_size()));
1683 for(Reloc_stub_map_const_iter p
= this->reloc_stubs_
.begin();
1684 p
!= this->reloc_stubs_
.end(); ++p
)
1685 relocate_reloc_stub(p
->second
, relinfo
, target_aarch64
, output_section
,
1686 view
, address
, view_size
);
1690 // Relocate one reloc stub. This is a helper for
1691 // Stub_table::relocate_reloc_stubs().
1693 template<int size
, bool big_endian
>
1695 Stub_table
<size
, big_endian
>::
1696 relocate_reloc_stub(The_reloc_stub
* stub
,
1697 const The_relocate_info
* relinfo
,
1698 The_target_aarch64
* target_aarch64
,
1699 Output_section
* output_section
,
1700 unsigned char* view
,
1701 AArch64_address address
,
1702 section_size_type view_size
)
1704 // "offset" is the offset from the beginning of the stub_table.
1705 section_size_type offset
= stub
->offset();
1706 section_size_type stub_size
= stub
->stub_size();
1707 // "view_size" is the total size of the stub_table.
1708 gold_assert(offset
+ stub_size
<= view_size
);
1710 target_aarch64
->relocate_reloc_stub(stub
, relinfo
, output_section
,
1711 view
+ offset
, address
+ offset
, view_size
);
1715 // Write out the stubs to file.
1717 template<int size
, bool big_endian
>
1719 Stub_table
<size
, big_endian
>::do_write(Output_file
* of
)
1721 off_t offset
= this->offset();
1722 const section_size_type oview_size
=
1723 convert_to_section_size_type(this->data_size());
1724 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1726 // Write relocation stubs.
1727 for (typename
Reloc_stub_map::const_iterator p
= this->reloc_stubs_
.begin();
1728 p
!= this->reloc_stubs_
.end(); ++p
)
1730 The_reloc_stub
* stub
= p
->second
;
1731 AArch64_address address
= this->address() + stub
->offset();
1732 gold_assert(address
==
1733 align_address(address
, The_reloc_stub::STUB_ADDR_ALIGN
));
1734 stub
->write(oview
+ stub
->offset(), stub
->stub_size());
1737 // Write erratum stubs.
1738 unsigned int erratum_stub_start_offset
=
1739 align_address(this->reloc_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1740 for (typename
Erratum_stub_set::iterator p
= this->erratum_stubs_
.begin();
1741 p
!= this->erratum_stubs_
.end(); ++p
)
1743 The_erratum_stub
* stub(*p
);
1744 stub
->write(oview
+ erratum_stub_start_offset
+ stub
->offset(),
1748 of
->write_output_view(this->offset(), oview_size
, oview
);
1752 // AArch64_relobj class.
1754 template<int size
, bool big_endian
>
1755 class AArch64_relobj
: public Sized_relobj_file
<size
, big_endian
>
1758 typedef AArch64_relobj
<size
, big_endian
> This
;
1759 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1760 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1761 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1762 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1763 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1764 typedef typename
The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter
;
1765 typedef std::vector
<The_stub_table
*> Stub_table_list
;
1766 static const AArch64_address invalid_address
=
1767 static_cast<AArch64_address
>(-1);
1769 AArch64_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1770 const typename
elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1771 : Sized_relobj_file
<size
, big_endian
>(name
, input_file
, offset
, ehdr
),
1778 // Return the stub table of the SHNDX-th section if there is one.
1780 stub_table(unsigned int shndx
) const
1782 gold_assert(shndx
< this->stub_tables_
.size());
1783 return this->stub_tables_
[shndx
];
1786 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1788 set_stub_table(unsigned int shndx
, The_stub_table
* stub_table
)
1790 gold_assert(shndx
< this->stub_tables_
.size());
1791 this->stub_tables_
[shndx
] = stub_table
;
1794 // Entrance to errata scanning.
1796 scan_errata(unsigned int shndx
,
1797 const elfcpp::Shdr
<size
, big_endian
>&,
1798 Output_section
*, const Symbol_table
*,
1799 The_target_aarch64
*);
1801 // Scan all relocation sections for stub generation.
1803 scan_sections_for_stubs(The_target_aarch64
*, const Symbol_table
*,
1806 // Whether a section is a scannable text section.
1808 text_section_is_scannable(const elfcpp::Shdr
<size
, big_endian
>&, unsigned int,
1809 const Output_section
*, const Symbol_table
*);
1811 // Convert regular input section with index SHNDX to a relaxed section.
1813 convert_input_section_to_relaxed_section(unsigned shndx
)
1815 // The stubs have relocations and we need to process them after writing
1816 // out the stubs. So relocation now must follow section write.
1817 this->set_section_offset(shndx
, -1ULL);
1818 this->set_relocs_must_follow_section_writes();
1821 // Structure for mapping symbol position.
1822 struct Mapping_symbol_position
1824 Mapping_symbol_position(unsigned int shndx
, AArch64_address offset
):
1825 shndx_(shndx
), offset_(offset
)
1828 // "<" comparator used in ordered_map container.
1830 operator<(const Mapping_symbol_position
& p
) const
1832 return (this->shndx_
< p
.shndx_
1833 || (this->shndx_
== p
.shndx_
&& this->offset_
< p
.offset_
));
1837 unsigned int shndx_
;
1840 AArch64_address offset_
;
1843 typedef std::map
<Mapping_symbol_position
, char> Mapping_symbol_info
;
1846 // Post constructor setup.
1850 // Call parent's setup method.
1851 Sized_relobj_file
<size
, big_endian
>::do_setup();
1853 // Initialize look-up tables.
1854 this->stub_tables_
.resize(this->shnum());
1858 do_relocate_sections(
1859 const Symbol_table
* symtab
, const Layout
* layout
,
1860 const unsigned char* pshdrs
, Output_file
* of
,
1861 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1863 // Count local symbols and (optionally) record mapping info.
1865 do_count_local_symbols(Stringpool_template
<char>*,
1866 Stringpool_template
<char>*);
1869 // Fix all errata in the object, and for each erratum, relocate corresponding
1872 fix_errata_and_relocate_erratum_stubs(
1873 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1875 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1878 try_fix_erratum_843419_optimized(
1879 The_erratum_stub
*, AArch64_address
,
1880 typename Sized_relobj_file
<size
, big_endian
>::View_size
&);
1882 // Whether a section needs to be scanned for relocation stubs.
1884 section_needs_reloc_stub_scanning(const elfcpp::Shdr
<size
, big_endian
>&,
1885 const Relobj::Output_sections
&,
1886 const Symbol_table
*, const unsigned char*);
1888 // List of stub tables.
1889 Stub_table_list stub_tables_
;
1891 // Mapping symbol information sorted by (section index, section_offset).
1892 Mapping_symbol_info mapping_symbol_info_
;
1893 }; // End of AArch64_relobj
1896 // Override to record mapping symbol information.
1897 template<int size
, bool big_endian
>
1899 AArch64_relobj
<size
, big_endian
>::do_count_local_symbols(
1900 Stringpool_template
<char>* pool
, Stringpool_template
<char>* dynpool
)
1902 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(pool
, dynpool
);
1904 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1905 // processing if not fixing erratum.
1906 if (!parameters
->options().fix_cortex_a53_843419()
1907 && !parameters
->options().fix_cortex_a53_835769())
1910 const unsigned int loccount
= this->local_symbol_count();
1914 // Read the symbol table section header.
1915 const unsigned int symtab_shndx
= this->symtab_shndx();
1916 elfcpp::Shdr
<size
, big_endian
>
1917 symtabshdr(this, this->elf_file()->section_header(symtab_shndx
));
1918 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1920 // Read the local symbols.
1921 const int sym_size
=elfcpp::Elf_sizes
<size
>::sym_size
;
1922 gold_assert(loccount
== symtabshdr
.get_sh_info());
1923 off_t locsize
= loccount
* sym_size
;
1924 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1925 locsize
, true, true);
1927 // For mapping symbol processing, we need to read the symbol names.
1928 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
1929 if (strtab_shndx
>= this->shnum())
1931 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
1935 elfcpp::Shdr
<size
, big_endian
>
1936 strtabshdr(this, this->elf_file()->section_header(strtab_shndx
));
1937 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
1939 this->error(_("symbol table name section has wrong type: %u"),
1940 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
1944 const char* pnames
=
1945 reinterpret_cast<const char*>(this->get_view(strtabshdr
.get_sh_offset(),
1946 strtabshdr
.get_sh_size(),
1949 // Skip the first dummy symbol.
1951 typename Sized_relobj_file
<size
, big_endian
>::Local_values
*
1952 plocal_values
= this->local_values();
1953 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1955 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1956 Symbol_value
<size
>& lv((*plocal_values
)[i
]);
1957 AArch64_address input_value
= lv
.input_value();
1959 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1960 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1962 // Mapping symbols could be one of the following 4 forms -
1967 const char* sym_name
= pnames
+ sym
.get_st_name();
1968 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1969 && (sym_name
[2] == '\0' || sym_name
[2] == '.'))
1972 unsigned int input_shndx
=
1973 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1974 gold_assert(is_ordinary
);
1976 Mapping_symbol_position
msp(input_shndx
, input_value
);
1977 // Insert mapping_symbol_info into map whose ordering is defined by
1978 // (shndx, offset_within_section).
1979 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1985 // Fix all errata in the object and for each erratum, we relocate the
1986 // corresponding erratum stub (by calling Stub_table::relocate_erratum_stub).
1988 template<int size
, bool big_endian
>
1990 AArch64_relobj
<size
, big_endian
>::fix_errata_and_relocate_erratum_stubs(
1991 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1993 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1994 unsigned int shnum
= this->shnum();
1995 const Relobj::Output_sections
& out_sections(this->output_sections());
1996 for (unsigned int i
= 1; i
< shnum
; ++i
)
1998 The_stub_table
* stub_table
= this->stub_table(i
);
2001 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
2002 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
2003 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
2004 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2005 pview((*pviews
)[i
]);
2006 AArch64_address view_offset
= 0;
2007 if (pview
.is_input_output_view
)
2009 // In this case, write_sections has not added the output offset to
2010 // the view's address, so we must do so. Currently this only happens
2011 // for a relaxed section.
2012 unsigned int index
= this->adjust_shndx(i
);
2013 const Output_relaxed_input_section
* poris
=
2014 out_sections
[index
]->find_relaxed_input_section(this, index
);
2015 gold_assert(poris
!= NULL
);
2016 view_offset
= poris
->address() - pview
.address
;
2021 The_erratum_stub
* stub
= *p
;
2023 // Double check data before fix.
2024 gold_assert(pview
.address
+ view_offset
+ stub
->sh_offset()
2025 == stub
->erratum_address());
2027 // Update previously recorded erratum insn with relocated
2030 reinterpret_cast<Insntype
*>(
2031 pview
.view
+ view_offset
+ stub
->sh_offset());
2032 Insntype insn_to_fix
= ip
[0];
2033 stub
->update_erratum_insn(insn_to_fix
);
2035 // First try to see if erratum is 843419 and if it can be fixed
2036 // without using branch-to-stub.
2037 if (!try_fix_erratum_843419_optimized(stub
, view_offset
, pview
))
2039 // Replace the erratum insn with a branch-to-stub.
2040 AArch64_address stub_address
=
2041 stub_table
->erratum_stub_address(stub
);
2042 unsigned int b_offset
= stub_address
- stub
->erratum_address();
2043 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
2044 pview
.view
+ view_offset
+ stub
->sh_offset(),
2045 b_offset
& 0xfffffff);
2048 // Erratum fix is done (or skipped), continue to relocate erratum
2049 // stub. Note, when erratum fix is skipped (either because we
2050 // proactively change the code sequence or the code sequence is
2051 // changed by relaxation, etc), we can still safely relocate the
2052 // erratum stub, ignoring the fact the erratum could never be
2054 stub_table
->relocate_erratum_stub(
2056 pview
.view
+ (stub_table
->address() - pview
.address
));
2058 // Next erratum stub.
2065 // This is an optimization for 843419. This erratum requires the sequence begin
2066 // with 'adrp', when final value calculated by adrp fits in adr, we can just
2067 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
2068 // in this case, we do not delete the erratum stub (too late to do so), it is
2069 // merely generated without ever being called.)
2071 template<int size
, bool big_endian
>
2073 AArch64_relobj
<size
, big_endian
>::try_fix_erratum_843419_optimized(
2074 The_erratum_stub
* stub
, AArch64_address view_offset
,
2075 typename Sized_relobj_file
<size
, big_endian
>::View_size
& pview
)
2077 if (stub
->type() != ST_E_843419
)
2080 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2081 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
2082 E843419_stub
<size
, big_endian
>* e843419_stub
=
2083 reinterpret_cast<E843419_stub
<size
, big_endian
>*>(stub
);
2084 AArch64_address pc
=
2085 pview
.address
+ view_offset
+ e843419_stub
->adrp_sh_offset();
2086 unsigned int adrp_offset
= e843419_stub
->adrp_sh_offset ();
2087 Insntype
* adrp_view
=
2088 reinterpret_cast<Insntype
*>(pview
.view
+ view_offset
+ adrp_offset
);
2089 Insntype adrp_insn
= adrp_view
[0];
2091 // If the instruction at adrp_sh_offset is "mrs R, tpidr_el0", it may come
2092 // from IE -> LE relaxation etc. This is a side-effect of TLS relaxation that
2093 // ADRP has been turned into MRS, there is no erratum risk anymore.
2094 // Therefore, we return true to avoid doing unnecessary branch-to-stub.
2095 if (Insn_utilities::is_mrs_tpidr_el0(adrp_insn
))
2098 // If the instruction at adrp_sh_offset is not ADRP and the instruction before
2099 // it is "mrs R, tpidr_el0", it may come from LD -> LE relaxation etc.
2100 // Like the above case, there is no erratum risk any more, we can safely
2102 if (!Insn_utilities::is_adrp(adrp_insn
) && adrp_offset
)
2104 Insntype
* prev_view
=
2105 reinterpret_cast<Insntype
*>(
2106 pview
.view
+ view_offset
+ adrp_offset
- 4);
2107 Insntype prev_insn
= prev_view
[0];
2109 if (Insn_utilities::is_mrs_tpidr_el0(prev_insn
))
2113 /* If we reach here, the first instruction must be ADRP. */
2114 gold_assert(Insn_utilities::is_adrp(adrp_insn
));
2115 // Get adrp 33-bit signed imm value.
2116 int64_t adrp_imm
= Insn_utilities::
2117 aarch64_adrp_decode_imm(adrp_insn
);
2118 // adrp - final value transferred to target register is calculated as:
2119 // PC[11:0] = Zeros(12)
2120 // adrp_dest_value = PC + adrp_imm;
2121 int64_t adrp_dest_value
= (pc
& ~((1 << 12) - 1)) + adrp_imm
;
2122 // adr -final value transferred to target register is calucalted as:
2125 // PC + adr_imm = adrp_dest_value
2127 // adr_imm = adrp_dest_value - PC
2128 int64_t adr_imm
= adrp_dest_value
- pc
;
2129 // Check if imm fits in adr (21-bit signed).
2130 if (-(1 << 20) <= adr_imm
&& adr_imm
< (1 << 20))
2132 // Convert 'adrp' into 'adr'.
2133 Insntype adr_insn
= adrp_insn
& ((1u << 31) - 1);
2134 adr_insn
= Insn_utilities::
2135 aarch64_adr_encode_imm(adr_insn
, adr_imm
);
2136 elfcpp::Swap
<32, big_endian
>::writeval(adrp_view
, adr_insn
);
2143 // Relocate sections.
2145 template<int size
, bool big_endian
>
2147 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
2148 const Symbol_table
* symtab
, const Layout
* layout
,
2149 const unsigned char* pshdrs
, Output_file
* of
,
2150 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
2152 // Relocate the section data.
2153 this->relocate_section_range(symtab
, layout
, pshdrs
, of
, pviews
,
2154 1, this->shnum() - 1);
2156 // We do not generate stubs if doing a relocatable link.
2157 if (parameters
->options().relocatable())
2160 // This part only relocates erratum stubs that belong to input sections of this
2162 if (parameters
->options().fix_cortex_a53_843419()
2163 || parameters
->options().fix_cortex_a53_835769())
2164 this->fix_errata_and_relocate_erratum_stubs(pviews
);
2166 Relocate_info
<size
, big_endian
> relinfo
;
2167 relinfo
.symtab
= symtab
;
2168 relinfo
.layout
= layout
;
2169 relinfo
.object
= this;
2171 // This part relocates all reloc stubs that are contained in stub_tables of
2172 // this object file.
2173 unsigned int shnum
= this->shnum();
2174 The_target_aarch64
* target
= The_target_aarch64::current_target();
2176 for (unsigned int i
= 1; i
< shnum
; ++i
)
2178 The_aarch64_input_section
* aarch64_input_section
=
2179 target
->find_aarch64_input_section(this, i
);
2180 if (aarch64_input_section
!= NULL
2181 && aarch64_input_section
->is_stub_table_owner()
2182 && !aarch64_input_section
->stub_table()->empty())
2184 Output_section
* os
= this->output_section(i
);
2185 gold_assert(os
!= NULL
);
2187 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
2188 relinfo
.reloc_shdr
= NULL
;
2189 relinfo
.data_shndx
= i
;
2190 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
2192 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2193 view_struct
= (*pviews
)[i
];
2194 gold_assert(view_struct
.view
!= NULL
);
2196 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
2197 off_t offset
= stub_table
->address() - view_struct
.address
;
2198 unsigned char* view
= view_struct
.view
+ offset
;
2199 AArch64_address address
= stub_table
->address();
2200 section_size_type view_size
= stub_table
->data_size();
2201 stub_table
->relocate_reloc_stubs(&relinfo
, target
, os
, view
, address
,
2208 // Determine if an input section is scannable for stub processing. SHDR is
2209 // the header of the section and SHNDX is the section index. OS is the output
2210 // section for the input section and SYMTAB is the global symbol table used to
2211 // look up ICF information.
2213 template<int size
, bool big_endian
>
2215 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
2216 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
2217 unsigned int text_shndx
,
2218 const Output_section
* os
,
2219 const Symbol_table
* symtab
)
2221 // Skip any empty sections, unallocated sections or sections whose
2222 // type are not SHT_PROGBITS.
2223 if (text_shdr
.get_sh_size() == 0
2224 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
2225 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2228 // Skip any discarded or ICF'ed sections.
2229 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
2232 // Skip exception frame.
2233 if (strcmp(os
->name(), ".eh_frame") == 0)
2236 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
2237 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2243 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2244 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2246 template<int size
, bool big_endian
>
2248 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2249 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2250 const Relobj::Output_sections
& out_sections
,
2251 const Symbol_table
* symtab
,
2252 const unsigned char* pshdrs
)
2254 unsigned int sh_type
= shdr
.get_sh_type();
2255 if (sh_type
!= elfcpp::SHT_RELA
)
2258 // Ignore empty section.
2259 off_t sh_size
= shdr
.get_sh_size();
2263 // Ignore reloc section with unexpected symbol table. The
2264 // error will be reported in the final link.
2265 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2268 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2269 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2271 // Ignore reloc section with unexpected entsize or uneven size.
2272 // The error will be reported in the final link.
2273 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2276 // Ignore reloc section with bad info. This error will be
2277 // reported in the final link.
2278 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2279 if (text_shndx
>= this->shnum())
2282 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2283 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2284 text_shndx
* shdr_size
);
2285 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2286 out_sections
[text_shndx
], symtab
);
2290 // Scan section SHNDX for erratum 843419 and 835769.
2292 template<int size
, bool big_endian
>
2294 AArch64_relobj
<size
, big_endian
>::scan_errata(
2295 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2296 Output_section
* os
, const Symbol_table
* symtab
,
2297 The_target_aarch64
* target
)
2299 if (shdr
.get_sh_size() == 0
2300 || (shdr
.get_sh_flags() &
2301 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2302 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2305 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2307 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2308 AArch64_address output_address
;
2309 if (output_offset
!= invalid_address
)
2310 output_address
= os
->address() + output_offset
;
2313 const Output_relaxed_input_section
* poris
=
2314 os
->find_relaxed_input_section(this, shndx
);
2316 output_address
= poris
->address();
2319 // Update the addresses in previously generated erratum stubs. Unlike when
2320 // we scan relocations for stubs, if section addresses have changed due to
2321 // other relaxations we are unlikely to scan the same erratum instances
2323 The_stub_table
* stub_table
= this->stub_table(shndx
);
2326 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
2327 ipair(stub_table
->find_erratum_stubs_for_input_section(this, shndx
));
2328 for (Erratum_stub_set_iter p
= ipair
.first
; p
!= ipair
.second
; ++p
)
2329 (*p
)->update_erratum_address(output_address
);
2332 section_size_type input_view_size
= 0;
2333 const unsigned char* input_view
=
2334 this->section_contents(shndx
, &input_view_size
, false);
2336 Mapping_symbol_position
section_start(shndx
, 0);
2337 // Find the first mapping symbol record within section shndx.
2338 typename
Mapping_symbol_info::const_iterator p
=
2339 this->mapping_symbol_info_
.lower_bound(section_start
);
2340 while (p
!= this->mapping_symbol_info_
.end() &&
2341 p
->first
.shndx_
== shndx
)
2343 typename
Mapping_symbol_info::const_iterator prev
= p
;
2345 if (prev
->second
== 'x')
2347 section_size_type span_start
=
2348 convert_to_section_size_type(prev
->first
.offset_
);
2349 section_size_type span_end
;
2350 if (p
!= this->mapping_symbol_info_
.end()
2351 && p
->first
.shndx_
== shndx
)
2352 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2354 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2356 // Here we do not share the scanning code of both errata. For 843419,
2357 // only the last few insns of each page are examined, which is fast,
2358 // whereas, for 835769, every insn pair needs to be checked.
2360 if (parameters
->options().fix_cortex_a53_843419())
2361 target
->scan_erratum_843419_span(
2362 this, shndx
, span_start
, span_end
,
2363 const_cast<unsigned char*>(input_view
), output_address
);
2365 if (parameters
->options().fix_cortex_a53_835769())
2366 target
->scan_erratum_835769_span(
2367 this, shndx
, span_start
, span_end
,
2368 const_cast<unsigned char*>(input_view
), output_address
);
2374 // Scan relocations for stub generation.
2376 template<int size
, bool big_endian
>
2378 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2379 The_target_aarch64
* target
,
2380 const Symbol_table
* symtab
,
2381 const Layout
* layout
)
2383 unsigned int shnum
= this->shnum();
2384 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2386 // Read the section headers.
2387 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2391 // To speed up processing, we set up hash tables for fast lookup of
2392 // input offsets to output addresses.
2393 this->initialize_input_to_output_maps();
2395 const Relobj::Output_sections
& out_sections(this->output_sections());
2397 Relocate_info
<size
, big_endian
> relinfo
;
2398 relinfo
.symtab
= symtab
;
2399 relinfo
.layout
= layout
;
2400 relinfo
.object
= this;
2402 // Do relocation stubs scanning.
2403 const unsigned char* p
= pshdrs
+ shdr_size
;
2404 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2406 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2407 if (parameters
->options().fix_cortex_a53_843419()
2408 || parameters
->options().fix_cortex_a53_835769())
2409 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2410 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2413 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2414 AArch64_address output_offset
=
2415 this->get_output_section_offset(index
);
2416 AArch64_address output_address
;
2417 if (output_offset
!= invalid_address
)
2419 output_address
= out_sections
[index
]->address() + output_offset
;
2423 // Currently this only happens for a relaxed section.
2424 const Output_relaxed_input_section
* poris
=
2425 out_sections
[index
]->find_relaxed_input_section(this, index
);
2426 gold_assert(poris
!= NULL
);
2427 output_address
= poris
->address();
2430 // Get the relocations.
2431 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2435 // Get the section contents.
2436 section_size_type input_view_size
= 0;
2437 const unsigned char* input_view
=
2438 this->section_contents(index
, &input_view_size
, false);
2440 relinfo
.reloc_shndx
= i
;
2441 relinfo
.data_shndx
= index
;
2442 unsigned int sh_type
= shdr
.get_sh_type();
2443 unsigned int reloc_size
;
2444 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2445 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2447 Output_section
* os
= out_sections
[index
];
2448 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2449 shdr
.get_sh_size() / reloc_size
,
2451 output_offset
== invalid_address
,
2452 input_view
, output_address
,
2459 // A class to wrap an ordinary input section containing executable code.
2461 template<int size
, bool big_endian
>
2462 class AArch64_input_section
: public Output_relaxed_input_section
2465 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2467 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2468 : Output_relaxed_input_section(relobj
, shndx
, 1),
2470 original_contents_(NULL
), original_size_(0),
2471 original_addralign_(1)
2474 ~AArch64_input_section()
2475 { delete[] this->original_contents_
; }
2481 // Set the stub_table.
2483 set_stub_table(The_stub_table
* st
)
2484 { this->stub_table_
= st
; }
2486 // Whether this is a stub table owner.
2488 is_stub_table_owner() const
2489 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2491 // Return the original size of the section.
2493 original_size() const
2494 { return this->original_size_
; }
2496 // Return the stub table.
2499 { return stub_table_
; }
2502 // Write out this input section.
2504 do_write(Output_file
*);
2506 // Return required alignment of this.
2508 do_addralign() const
2510 if (this->is_stub_table_owner())
2511 return std::max(this->stub_table_
->addralign(),
2512 static_cast<uint64_t>(this->original_addralign_
));
2514 return this->original_addralign_
;
2517 // Finalize data size.
2519 set_final_data_size();
2521 // Reset address and file offset.
2523 do_reset_address_and_file_offset();
2527 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2528 section_offset_type offset
,
2529 section_offset_type
* poutput
) const
2531 if ((object
== this->relobj())
2532 && (shndx
== this->shndx())
2535 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2545 // Copying is not allowed.
2546 AArch64_input_section(const AArch64_input_section
&);
2547 AArch64_input_section
& operator=(const AArch64_input_section
&);
2549 // The relocation stubs.
2550 The_stub_table
* stub_table_
;
2551 // Original section contents. We have to make a copy here since the file
2552 // containing the original section may not be locked when we need to access
2554 unsigned char* original_contents_
;
2555 // Section size of the original input section.
2556 uint32_t original_size_
;
2557 // Address alignment of the original input section.
2558 uint32_t original_addralign_
;
2559 }; // End of AArch64_input_section
2562 // Finalize data size.
2564 template<int size
, bool big_endian
>
2566 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2568 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2570 if (this->is_stub_table_owner())
2572 this->stub_table_
->finalize_data_size();
2573 off
= align_address(off
, this->stub_table_
->addralign());
2574 off
+= this->stub_table_
->data_size();
2576 this->set_data_size(off
);
2580 // Reset address and file offset.
2582 template<int size
, bool big_endian
>
2584 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2586 // Size of the original input section contents.
2587 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2589 // If this is a stub table owner, account for the stub table size.
2590 if (this->is_stub_table_owner())
2592 The_stub_table
* stub_table
= this->stub_table_
;
2594 // Reset the stub table's address and file offset. The
2595 // current data size for child will be updated after that.
2596 stub_table_
->reset_address_and_file_offset();
2597 off
= align_address(off
, stub_table_
->addralign());
2598 off
+= stub_table
->current_data_size();
2601 this->set_current_data_size(off
);
2605 // Initialize an Arm_input_section.
2607 template<int size
, bool big_endian
>
2609 AArch64_input_section
<size
, big_endian
>::init()
2611 Relobj
* relobj
= this->relobj();
2612 unsigned int shndx
= this->shndx();
2614 // We have to cache original size, alignment and contents to avoid locking
2615 // the original file.
2616 this->original_addralign_
=
2617 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2619 // This is not efficient but we expect only a small number of relaxed
2620 // input sections for stubs.
2621 section_size_type section_size
;
2622 const unsigned char* section_contents
=
2623 relobj
->section_contents(shndx
, §ion_size
, false);
2624 this->original_size_
=
2625 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2627 gold_assert(this->original_contents_
== NULL
);
2628 this->original_contents_
= new unsigned char[section_size
];
2629 memcpy(this->original_contents_
, section_contents
, section_size
);
2631 // We want to make this look like the original input section after
2632 // output sections are finalized.
2633 Output_section
* os
= relobj
->output_section(shndx
);
2634 off_t offset
= relobj
->output_section_offset(shndx
);
2635 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2636 this->set_address(os
->address() + offset
);
2637 this->set_file_offset(os
->offset() + offset
);
2638 this->set_current_data_size(this->original_size_
);
2639 this->finalize_data_size();
2643 // Write data to output file.
2645 template<int size
, bool big_endian
>
2647 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2649 // We have to write out the original section content.
2650 gold_assert(this->original_contents_
!= NULL
);
2651 of
->write(this->offset(), this->original_contents_
,
2652 this->original_size_
);
2654 // If this owns a stub table and it is not empty, write it.
2655 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2656 this->stub_table_
->write(of
);
2660 // Arm output section class. This is defined mainly to add a number of stub
2661 // generation methods.
2663 template<int size
, bool big_endian
>
2664 class AArch64_output_section
: public Output_section
2667 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2668 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2669 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2670 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2673 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2674 elfcpp::Elf_Xword flags
)
2675 : Output_section(name
, type
, flags
)
2678 ~AArch64_output_section() {}
2680 // Group input sections for stub generation.
2682 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2686 typedef Output_section::Input_section Input_section
;
2687 typedef Output_section::Input_section_list Input_section_list
;
2689 // Create a stub group.
2691 create_stub_group(Input_section_list::const_iterator
,
2692 Input_section_list::const_iterator
,
2693 Input_section_list::const_iterator
,
2694 The_target_aarch64
*,
2695 std::vector
<Output_relaxed_input_section
*>&,
2697 }; // End of AArch64_output_section
2700 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2701 // the input section that will be the owner of the stub table.
2703 template<int size
, bool big_endian
> void
2704 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2705 Input_section_list::const_iterator first
,
2706 Input_section_list::const_iterator last
,
2707 Input_section_list::const_iterator owner
,
2708 The_target_aarch64
* target
,
2709 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2712 // Currently we convert ordinary input sections into relaxed sections only
2714 The_aarch64_input_section
* input_section
;
2715 if (owner
->is_relaxed_input_section())
2719 gold_assert(owner
->is_input_section());
2720 // Create a new relaxed input section. We need to lock the original
2722 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2724 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2725 new_relaxed_sections
.push_back(input_section
);
2728 // Create a stub table.
2729 The_stub_table
* stub_table
=
2730 target
->new_stub_table(input_section
);
2732 input_section
->set_stub_table(stub_table
);
2734 Input_section_list::const_iterator p
= first
;
2735 // Look for input sections or relaxed input sections in [first ... last].
2738 if (p
->is_input_section() || p
->is_relaxed_input_section())
2740 // The stub table information for input sections live
2741 // in their objects.
2742 The_aarch64_relobj
* aarch64_relobj
=
2743 static_cast<The_aarch64_relobj
*>(p
->relobj());
2744 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2747 while (p
++ != last
);
2751 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2752 // stub groups. We grow a stub group by adding input section until the size is
2753 // just below GROUP_SIZE. The last input section will be converted into a stub
2754 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2755 // after the stub table, effectively doubling the group size.
2757 // This is similar to the group_sections() function in elf32-arm.c but is
2758 // implemented differently.
2760 template<int size
, bool big_endian
>
2761 void AArch64_output_section
<size
, big_endian
>::group_sections(
2762 section_size_type group_size
,
2763 bool stubs_always_after_branch
,
2764 Target_aarch64
<size
, big_endian
>* target
,
2770 FINDING_STUB_SECTION
,
2774 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2776 State state
= NO_GROUP
;
2777 section_size_type off
= 0;
2778 section_size_type group_begin_offset
= 0;
2779 section_size_type group_end_offset
= 0;
2780 section_size_type stub_table_end_offset
= 0;
2781 Input_section_list::const_iterator group_begin
=
2782 this->input_sections().end();
2783 Input_section_list::const_iterator stub_table
=
2784 this->input_sections().end();
2785 Input_section_list::const_iterator group_end
= this->input_sections().end();
2786 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2787 p
!= this->input_sections().end();
2790 section_size_type section_begin_offset
=
2791 align_address(off
, p
->addralign());
2792 section_size_type section_end_offset
=
2793 section_begin_offset
+ p
->data_size();
2795 // Check to see if we should group the previously seen sections.
2801 case FINDING_STUB_SECTION
:
2802 // Adding this section makes the group larger than GROUP_SIZE.
2803 if (section_end_offset
- group_begin_offset
>= group_size
)
2805 if (stubs_always_after_branch
)
2807 gold_assert(group_end
!= this->input_sections().end());
2808 this->create_stub_group(group_begin
, group_end
, group_end
,
2809 target
, new_relaxed_sections
,
2815 // Input sections up to stub_group_size bytes after the stub
2816 // table can be handled by it too.
2817 state
= HAS_STUB_SECTION
;
2818 stub_table
= group_end
;
2819 stub_table_end_offset
= group_end_offset
;
2824 case HAS_STUB_SECTION
:
2825 // Adding this section makes the post stub-section group larger
2828 // NOT SUPPORTED YET. For completeness only.
2829 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2831 gold_assert(group_end
!= this->input_sections().end());
2832 this->create_stub_group(group_begin
, group_end
, stub_table
,
2833 target
, new_relaxed_sections
, task
);
2842 // If we see an input section and currently there is no group, start
2843 // a new one. Skip any empty sections. We look at the data size
2844 // instead of calling p->relobj()->section_size() to avoid locking.
2845 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2846 && (p
->data_size() != 0))
2848 if (state
== NO_GROUP
)
2850 state
= FINDING_STUB_SECTION
;
2852 group_begin_offset
= section_begin_offset
;
2855 // Keep track of the last input section seen.
2857 group_end_offset
= section_end_offset
;
2860 off
= section_end_offset
;
2863 // Create a stub group for any ungrouped sections.
2864 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2866 gold_assert(group_end
!= this->input_sections().end());
2867 this->create_stub_group(group_begin
, group_end
,
2868 (state
== FINDING_STUB_SECTION
2871 target
, new_relaxed_sections
, task
);
2874 if (!new_relaxed_sections
.empty())
2875 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2877 // Update the section offsets
2878 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2880 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2881 new_relaxed_sections
[i
]->relobj());
2882 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2883 // Tell AArch64_relobj that this input section is converted.
2884 relobj
->convert_input_section_to_relaxed_section(shndx
);
2886 } // End of AArch64_output_section::group_sections
2889 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2892 // The aarch64 target class.
2894 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2895 template<int size
, bool big_endian
>
2896 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2899 typedef Target_aarch64
<size
, big_endian
> This
;
2900 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2902 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2903 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2904 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2905 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2906 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2907 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2908 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2909 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2910 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2911 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2912 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2913 typedef Unordered_map
<Section_id
,
2914 AArch64_input_section
<size
, big_endian
>*,
2915 Section_id_hash
> AArch64_input_section_map
;
2916 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2917 const static int TCB_SIZE
= size
/ 8 * 2;
2919 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2920 : Sized_target
<size
, big_endian
>(info
),
2921 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2922 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2923 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2924 got_mod_index_offset_(-1U),
2925 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2926 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2929 // Scan the relocations to determine unreferenced sections for
2930 // garbage collection.
2932 gc_process_relocs(Symbol_table
* symtab
,
2934 Sized_relobj_file
<size
, big_endian
>* object
,
2935 unsigned int data_shndx
,
2936 unsigned int sh_type
,
2937 const unsigned char* prelocs
,
2939 Output_section
* output_section
,
2940 bool needs_special_offset_handling
,
2941 size_t local_symbol_count
,
2942 const unsigned char* plocal_symbols
);
2944 // Scan the relocations to look for symbol adjustments.
2946 scan_relocs(Symbol_table
* symtab
,
2948 Sized_relobj_file
<size
, big_endian
>* object
,
2949 unsigned int data_shndx
,
2950 unsigned int sh_type
,
2951 const unsigned char* prelocs
,
2953 Output_section
* output_section
,
2954 bool needs_special_offset_handling
,
2955 size_t local_symbol_count
,
2956 const unsigned char* plocal_symbols
);
2958 // Finalize the sections.
2960 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2962 // Return the value to use for a dynamic which requires special
2965 do_dynsym_value(const Symbol
*) const;
2967 // Relocate a section.
2969 relocate_section(const Relocate_info
<size
, big_endian
>*,
2970 unsigned int sh_type
,
2971 const unsigned char* prelocs
,
2973 Output_section
* output_section
,
2974 bool needs_special_offset_handling
,
2975 unsigned char* view
,
2976 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2977 section_size_type view_size
,
2978 const Reloc_symbol_changes
*);
2980 // Scan the relocs during a relocatable link.
2982 scan_relocatable_relocs(Symbol_table
* symtab
,
2984 Sized_relobj_file
<size
, big_endian
>* object
,
2985 unsigned int data_shndx
,
2986 unsigned int sh_type
,
2987 const unsigned char* prelocs
,
2989 Output_section
* output_section
,
2990 bool needs_special_offset_handling
,
2991 size_t local_symbol_count
,
2992 const unsigned char* plocal_symbols
,
2993 Relocatable_relocs
*);
2995 // Scan the relocs for --emit-relocs.
2997 emit_relocs_scan(Symbol_table
* symtab
,
2999 Sized_relobj_file
<size
, big_endian
>* object
,
3000 unsigned int data_shndx
,
3001 unsigned int sh_type
,
3002 const unsigned char* prelocs
,
3004 Output_section
* output_section
,
3005 bool needs_special_offset_handling
,
3006 size_t local_symbol_count
,
3007 const unsigned char* plocal_syms
,
3008 Relocatable_relocs
* rr
);
3010 // Relocate a section during a relocatable link.
3013 const Relocate_info
<size
, big_endian
>*,
3014 unsigned int sh_type
,
3015 const unsigned char* prelocs
,
3017 Output_section
* output_section
,
3018 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
3019 unsigned char* view
,
3020 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
3021 section_size_type view_size
,
3022 unsigned char* reloc_view
,
3023 section_size_type reloc_view_size
);
3025 // Return the symbol index to use for a target specific relocation.
3026 // The only target specific relocation is R_AARCH64_TLSDESC for a
3027 // local symbol, which is an absolute reloc.
3029 do_reloc_symbol_index(void*, unsigned int r_type
) const
3031 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
3035 // Return the addend to use for a target specific relocation.
3037 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
3039 // Return the PLT section.
3041 do_plt_address_for_global(const Symbol
* gsym
) const
3042 { return this->plt_section()->address_for_global(gsym
); }
3045 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
3046 { return this->plt_section()->address_for_local(relobj
, symndx
); }
3048 // This function should be defined in targets that can use relocation
3049 // types to determine (implemented in local_reloc_may_be_function_pointer
3050 // and global_reloc_may_be_function_pointer)
3051 // if a function's pointer is taken. ICF uses this in safe mode to only
3052 // fold those functions whose pointer is defintely not taken.
3054 do_can_check_for_function_pointers() const
3057 // Return the number of entries in the PLT.
3059 plt_entry_count() const;
3061 //Return the offset of the first non-reserved PLT entry.
3063 first_plt_entry_offset() const;
3065 // Return the size of each PLT entry.
3067 plt_entry_size() const;
3069 // Create a stub table.
3071 new_stub_table(The_aarch64_input_section
*);
3073 // Create an aarch64 input section.
3074 The_aarch64_input_section
*
3075 new_aarch64_input_section(Relobj
*, unsigned int);
3077 // Find an aarch64 input section instance for a given OBJ and SHNDX.
3078 The_aarch64_input_section
*
3079 find_aarch64_input_section(Relobj
*, unsigned int) const;
3081 // Return the thread control block size.
3083 tcb_size() const { return This::TCB_SIZE
; }
3085 // Scan a section for stub generation.
3087 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
3088 const unsigned char*, size_t, Output_section
*,
3089 bool, const unsigned char*,
3093 // Scan a relocation section for stub.
3094 template<int sh_type
>
3096 scan_reloc_section_for_stubs(
3097 const The_relocate_info
* relinfo
,
3098 const unsigned char* prelocs
,
3100 Output_section
* output_section
,
3101 bool needs_special_offset_handling
,
3102 const unsigned char* view
,
3103 Address view_address
,
3106 // Relocate a single reloc stub.
3108 relocate_reloc_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
3109 Output_section
*, unsigned char*, Address
,
3112 // Get the default AArch64 target.
3116 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
3117 && parameters
->target().get_size() == size
3118 && parameters
->target().is_big_endian() == big_endian
);
3119 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
3123 // Scan erratum 843419 for a part of a section.
3125 scan_erratum_843419_span(
3126 AArch64_relobj
<size
, big_endian
>*,
3128 const section_size_type
,
3129 const section_size_type
,
3133 // Scan erratum 835769 for a part of a section.
3135 scan_erratum_835769_span(
3136 AArch64_relobj
<size
, big_endian
>*,
3138 const section_size_type
,
3139 const section_size_type
,
3145 do_select_as_default_target()
3147 gold_assert(aarch64_reloc_property_table
== NULL
);
3148 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
3151 // Add a new reloc argument, returning the index in the vector.
3153 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
3156 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
3157 return this->tlsdesc_reloc_info_
.size() - 1;
3160 virtual Output_data_plt_aarch64
<size
, big_endian
>*
3161 do_make_data_plt(Layout
* layout
,
3162 Output_data_got_aarch64
<size
, big_endian
>* got
,
3163 Output_data_space
* got_plt
,
3164 Output_data_space
* got_irelative
)
3166 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
3167 layout
, got
, got_plt
, got_irelative
);
3171 // do_make_elf_object to override the same function in the base class.
3173 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
3174 const elfcpp::Ehdr
<size
, big_endian
>&);
3176 Output_data_plt_aarch64
<size
, big_endian
>*
3177 make_data_plt(Layout
* layout
,
3178 Output_data_got_aarch64
<size
, big_endian
>* got
,
3179 Output_data_space
* got_plt
,
3180 Output_data_space
* got_irelative
)
3182 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
3185 // We only need to generate stubs, and hence perform relaxation if we are
3186 // not doing relocatable linking.
3188 do_may_relax() const
3189 { return !parameters
->options().relocatable(); }
3191 // Relaxation hook. This is where we do stub generation.
3193 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
3196 group_sections(Layout
* layout
,
3197 section_size_type group_size
,
3198 bool stubs_always_after_branch
,
3202 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
3203 const Sized_symbol
<size
>*, unsigned int,
3204 const Symbol_value
<size
>*,
3205 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
3208 // Make an output section.
3210 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
3211 elfcpp::Elf_Xword flags
)
3212 { return new The_aarch64_output_section(name
, type
, flags
); }
3215 // The class which scans relocations.
3220 : issued_non_pic_error_(false)
3224 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3225 Sized_relobj_file
<size
, big_endian
>* object
,
3226 unsigned int data_shndx
,
3227 Output_section
* output_section
,
3228 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3229 const elfcpp::Sym
<size
, big_endian
>& lsym
,
3233 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3234 Sized_relobj_file
<size
, big_endian
>* object
,
3235 unsigned int data_shndx
,
3236 Output_section
* output_section
,
3237 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3241 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3242 Target_aarch64
<size
, big_endian
>* ,
3243 Sized_relobj_file
<size
, big_endian
>* ,
3246 const elfcpp::Rela
<size
, big_endian
>& ,
3247 unsigned int r_type
,
3248 const elfcpp::Sym
<size
, big_endian
>&);
3251 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3252 Target_aarch64
<size
, big_endian
>* ,
3253 Sized_relobj_file
<size
, big_endian
>* ,
3256 const elfcpp::Rela
<size
, big_endian
>& ,
3257 unsigned int r_type
,
3262 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3263 unsigned int r_type
);
3266 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3267 unsigned int r_type
, Symbol
*);
3270 possible_function_pointer_reloc(unsigned int r_type
);
3273 check_non_pic(Relobj
*, unsigned int r_type
);
3276 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3277 unsigned int r_type
);
3279 // Whether we have issued an error about a non-PIC compilation.
3280 bool issued_non_pic_error_
;
3283 // The class which implements relocation.
3288 : skip_call_tls_get_addr_(false)
3294 // Do a relocation. Return false if the caller should not issue
3295 // any warnings about this relocation.
3297 relocate(const Relocate_info
<size
, big_endian
>*, unsigned int,
3298 Target_aarch64
*, Output_section
*, size_t, const unsigned char*,
3299 const Sized_symbol
<size
>*, const Symbol_value
<size
>*,
3300 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3304 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3305 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3306 Target_aarch64
<size
, big_endian
>*,
3308 const elfcpp::Rela
<size
, big_endian
>&,
3309 unsigned int r_type
, const Sized_symbol
<size
>*,
3310 const Symbol_value
<size
>*,
3312 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3314 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3316 const Relocate_info
<size
, big_endian
>*,
3317 Target_aarch64
<size
, big_endian
>*,
3318 const elfcpp::Rela
<size
, big_endian
>&,
3321 const Symbol_value
<size
>*);
3323 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3325 const Relocate_info
<size
, big_endian
>*,
3326 Target_aarch64
<size
, big_endian
>*,
3327 const elfcpp::Rela
<size
, big_endian
>&,
3330 const Symbol_value
<size
>*);
3332 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3334 const Relocate_info
<size
, big_endian
>*,
3335 Target_aarch64
<size
, big_endian
>*,
3336 const elfcpp::Rela
<size
, big_endian
>&,
3339 const Symbol_value
<size
>*);
3341 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3343 const Relocate_info
<size
, big_endian
>*,
3344 Target_aarch64
<size
, big_endian
>*,
3345 const elfcpp::Rela
<size
, big_endian
>&,
3348 const Symbol_value
<size
>*);
3350 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3352 const Relocate_info
<size
, big_endian
>*,
3353 Target_aarch64
<size
, big_endian
>*,
3354 const elfcpp::Rela
<size
, big_endian
>&,
3357 const Symbol_value
<size
>*,
3358 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3359 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3361 bool skip_call_tls_get_addr_
;
3363 }; // End of class Relocate
3365 // Adjust TLS relocation type based on the options and whether this
3366 // is a local symbol.
3367 static tls::Tls_optimization
3368 optimize_tls_reloc(bool is_final
, int r_type
);
3370 // Get the GOT section, creating it if necessary.
3371 Output_data_got_aarch64
<size
, big_endian
>*
3372 got_section(Symbol_table
*, Layout
*);
3374 // Get the GOT PLT section.
3376 got_plt_section() const
3378 gold_assert(this->got_plt_
!= NULL
);
3379 return this->got_plt_
;
3382 // Get the GOT section for TLSDESC entries.
3383 Output_data_got
<size
, big_endian
>*
3384 got_tlsdesc_section() const
3386 gold_assert(this->got_tlsdesc_
!= NULL
);
3387 return this->got_tlsdesc_
;
3390 // Create the PLT section.
3392 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3394 // Create a PLT entry for a global symbol.
3396 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3398 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3400 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3401 Sized_relobj_file
<size
, big_endian
>* relobj
,
3402 unsigned int local_sym_index
);
3404 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3406 define_tls_base_symbol(Symbol_table
*, Layout
*);
3408 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3410 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3412 // Create a GOT entry for the TLS module index.
3414 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3415 Sized_relobj_file
<size
, big_endian
>* object
);
3417 // Get the PLT section.
3418 Output_data_plt_aarch64
<size
, big_endian
>*
3421 gold_assert(this->plt_
!= NULL
);
3425 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3426 // ST_E_843419, we need an additional field for adrp offset.
3427 void create_erratum_stub(
3428 AArch64_relobj
<size
, big_endian
>* relobj
,
3430 section_size_type erratum_insn_offset
,
3431 Address erratum_address
,
3432 typename
Insn_utilities::Insntype erratum_insn
,
3434 unsigned int e843419_adrp_offset
=0);
3436 // Return whether this is a 3-insn erratum sequence.
3437 bool is_erratum_843419_sequence(
3438 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3439 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3440 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3442 // Return whether this is a 835769 sequence.
3443 // (Similarly implemented as in elfnn-aarch64.c.)
3444 bool is_erratum_835769_sequence(
3445 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3446 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3448 // Get the dynamic reloc section, creating it if necessary.
3450 rela_dyn_section(Layout
*);
3452 // Get the section to use for TLSDESC relocations.
3454 rela_tlsdesc_section(Layout
*) const;
3456 // Get the section to use for IRELATIVE relocations.
3458 rela_irelative_section(Layout
*);
3460 // Add a potential copy relocation.
3462 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3463 Sized_relobj_file
<size
, big_endian
>* object
,
3464 unsigned int shndx
, Output_section
* output_section
,
3465 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3467 unsigned int r_type
= elfcpp::elf_r_type
<size
>(reloc
.get_r_info());
3468 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3469 symtab
->get_sized_symbol
<size
>(sym
),
3470 object
, shndx
, output_section
,
3471 r_type
, reloc
.get_r_offset(),
3472 reloc
.get_r_addend(),
3473 this->rela_dyn_section(layout
));
3476 // Information about this specific target which we pass to the
3477 // general Target structure.
3478 static const Target::Target_info aarch64_info
;
3480 // The types of GOT entries needed for this platform.
3481 // These values are exposed to the ABI in an incremental link.
3482 // Do not renumber existing values without changing the version
3483 // number of the .gnu_incremental_inputs section.
3486 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3487 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3488 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3489 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3492 // This type is used as the argument to the target specific
3493 // relocation routines. The only target specific reloc is
3494 // R_AARCh64_TLSDESC against a local symbol.
3497 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3498 unsigned int a_r_sym
)
3499 : object(a_object
), r_sym(a_r_sym
)
3502 // The object in which the local symbol is defined.
3503 Sized_relobj_file
<size
, big_endian
>* object
;
3504 // The local symbol index in the object.
3509 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3511 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3512 // The GOT PLT section.
3513 Output_data_space
* got_plt_
;
3514 // The GOT section for IRELATIVE relocations.
3515 Output_data_space
* got_irelative_
;
3516 // The GOT section for TLSDESC relocations.
3517 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3518 // The _GLOBAL_OFFSET_TABLE_ symbol.
3519 Symbol
* global_offset_table_
;
3520 // The dynamic reloc section.
3521 Reloc_section
* rela_dyn_
;
3522 // The section to use for IRELATIVE relocs.
3523 Reloc_section
* rela_irelative_
;
3524 // Relocs saved to avoid a COPY reloc.
3525 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3526 // Offset of the GOT entry for the TLS module index.
3527 unsigned int got_mod_index_offset_
;
3528 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3529 // specific relocation. Here we store the object and local symbol
3530 // index for the relocation.
3531 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3532 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3533 bool tls_base_symbol_defined_
;
3534 // List of stub_tables
3535 Stub_table_list stub_tables_
;
3536 // Actual stub group size
3537 section_size_type stub_group_size_
;
3538 AArch64_input_section_map aarch64_input_section_map_
;
3539 }; // End of Target_aarch64
3543 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3546 false, // is_big_endian
3547 elfcpp::EM_AARCH64
, // machine_code
3548 false, // has_make_symbol
3549 false, // has_resolve
3550 false, // has_code_fill
3551 false, // is_default_stack_executable
3552 true, // can_icf_inline_merge_sections
3554 "/lib/ld.so.1", // program interpreter
3555 0x400000, // default_text_segment_address
3556 0x10000, // abi_pagesize (overridable by -z max-page-size)
3557 0x1000, // common_pagesize (overridable by -z common-page-size)
3558 false, // isolate_execinstr
3560 elfcpp::SHN_UNDEF
, // small_common_shndx
3561 elfcpp::SHN_UNDEF
, // large_common_shndx
3562 0, // small_common_section_flags
3563 0, // large_common_section_flags
3564 NULL
, // attributes_section
3565 NULL
, // attributes_vendor
3566 "_start", // entry_symbol_name
3567 32, // hash_entry_size
3571 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3574 false, // is_big_endian
3575 elfcpp::EM_AARCH64
, // machine_code
3576 false, // has_make_symbol
3577 false, // has_resolve
3578 false, // has_code_fill
3579 false, // is_default_stack_executable
3580 false, // can_icf_inline_merge_sections
3582 "/lib/ld.so.1", // program interpreter
3583 0x400000, // default_text_segment_address
3584 0x10000, // abi_pagesize (overridable by -z max-page-size)
3585 0x1000, // common_pagesize (overridable by -z common-page-size)
3586 false, // isolate_execinstr
3588 elfcpp::SHN_UNDEF
, // small_common_shndx
3589 elfcpp::SHN_UNDEF
, // large_common_shndx
3590 0, // small_common_section_flags
3591 0, // large_common_section_flags
3592 NULL
, // attributes_section
3593 NULL
, // attributes_vendor
3594 "_start", // entry_symbol_name
3595 32, // hash_entry_size
3599 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3602 true, // is_big_endian
3603 elfcpp::EM_AARCH64
, // machine_code
3604 false, // has_make_symbol
3605 false, // has_resolve
3606 false, // has_code_fill
3607 false, // is_default_stack_executable
3608 true, // can_icf_inline_merge_sections
3610 "/lib/ld.so.1", // program interpreter
3611 0x400000, // default_text_segment_address
3612 0x10000, // abi_pagesize (overridable by -z max-page-size)
3613 0x1000, // common_pagesize (overridable by -z common-page-size)
3614 false, // isolate_execinstr
3616 elfcpp::SHN_UNDEF
, // small_common_shndx
3617 elfcpp::SHN_UNDEF
, // large_common_shndx
3618 0, // small_common_section_flags
3619 0, // large_common_section_flags
3620 NULL
, // attributes_section
3621 NULL
, // attributes_vendor
3622 "_start", // entry_symbol_name
3623 32, // hash_entry_size
3627 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3630 true, // is_big_endian
3631 elfcpp::EM_AARCH64
, // machine_code
3632 false, // has_make_symbol
3633 false, // has_resolve
3634 false, // has_code_fill
3635 false, // is_default_stack_executable
3636 false, // can_icf_inline_merge_sections
3638 "/lib/ld.so.1", // program interpreter
3639 0x400000, // default_text_segment_address
3640 0x10000, // abi_pagesize (overridable by -z max-page-size)
3641 0x1000, // common_pagesize (overridable by -z common-page-size)
3642 false, // isolate_execinstr
3644 elfcpp::SHN_UNDEF
, // small_common_shndx
3645 elfcpp::SHN_UNDEF
, // large_common_shndx
3646 0, // small_common_section_flags
3647 0, // large_common_section_flags
3648 NULL
, // attributes_section
3649 NULL
, // attributes_vendor
3650 "_start", // entry_symbol_name
3651 32, // hash_entry_size
3654 // Get the GOT section, creating it if necessary.
3656 template<int size
, bool big_endian
>
3657 Output_data_got_aarch64
<size
, big_endian
>*
3658 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3661 if (this->got_
== NULL
)
3663 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3665 // When using -z now, we can treat .got.plt as a relro section.
3666 // Without -z now, it is modified after program startup by lazy
3668 bool is_got_plt_relro
= parameters
->options().now();
3669 Output_section_order got_order
= (is_got_plt_relro
3671 : ORDER_RELRO_LAST
);
3672 Output_section_order got_plt_order
= (is_got_plt_relro
3674 : ORDER_NON_RELRO_FIRST
);
3676 // Layout of .got and .got.plt sections.
3677 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3679 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3680 // .gotplt[1] reserved for ld.so (resolver)
3681 // .gotplt[2] reserved
3683 // Generate .got section.
3684 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3686 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3687 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3688 this->got_
, got_order
, true);
3689 // The first word of GOT is reserved for the address of .dynamic.
3690 // We put 0 here now. The value will be replaced later in
3691 // Output_data_got_aarch64::do_write.
3692 this->got_
->add_constant(0);
3694 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3695 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3696 // even if there is a .got.plt section.
3697 this->global_offset_table_
=
3698 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3699 Symbol_table::PREDEFINED
,
3701 0, 0, elfcpp::STT_OBJECT
,
3703 elfcpp::STV_HIDDEN
, 0,
3706 // Generate .got.plt section.
3707 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3708 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3710 | elfcpp::SHF_WRITE
),
3711 this->got_plt_
, got_plt_order
,
3714 // The first three entries are reserved.
3715 this->got_plt_
->set_current_data_size(
3716 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3718 // If there are any IRELATIVE relocations, they get GOT entries
3719 // in .got.plt after the jump slot entries.
3720 this->got_irelative_
= new Output_data_space(size
/ 8,
3721 "** GOT IRELATIVE PLT");
3722 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3724 | elfcpp::SHF_WRITE
),
3725 this->got_irelative_
,
3729 // If there are any TLSDESC relocations, they get GOT entries in
3730 // .got.plt after the jump slot and IRELATIVE entries.
3731 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3732 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3734 | elfcpp::SHF_WRITE
),
3739 if (!is_got_plt_relro
)
3741 // Those bytes can go into the relro segment.
3742 layout
->increase_relro(
3743 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3750 // Get the dynamic reloc section, creating it if necessary.
3752 template<int size
, bool big_endian
>
3753 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3754 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3756 if (this->rela_dyn_
== NULL
)
3758 gold_assert(layout
!= NULL
);
3759 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3760 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3761 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3762 ORDER_DYNAMIC_RELOCS
, false);
3764 return this->rela_dyn_
;
3767 // Get the section to use for IRELATIVE relocs, creating it if
3768 // necessary. These go in .rela.dyn, but only after all other dynamic
3769 // relocations. They need to follow the other dynamic relocations so
3770 // that they can refer to global variables initialized by those
3773 template<int size
, bool big_endian
>
3774 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3775 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3777 if (this->rela_irelative_
== NULL
)
3779 // Make sure we have already created the dynamic reloc section.
3780 this->rela_dyn_section(layout
);
3781 this->rela_irelative_
= new Reloc_section(false);
3782 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3783 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3784 ORDER_DYNAMIC_RELOCS
, false);
3785 gold_assert(this->rela_dyn_
->output_section()
3786 == this->rela_irelative_
->output_section());
3788 return this->rela_irelative_
;
3792 // do_make_elf_object to override the same function in the base class. We need
3793 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3794 // store backend specific information. Hence we need to have our own ELF object
3797 template<int size
, bool big_endian
>
3799 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3800 const std::string
& name
,
3801 Input_file
* input_file
,
3802 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3804 int et
= ehdr
.get_e_type();
3805 // ET_EXEC files are valid input for --just-symbols/-R,
3806 // and we treat them as relocatable objects.
3807 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3808 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3809 name
, input_file
, offset
, ehdr
);
3810 else if (et
== elfcpp::ET_REL
)
3812 AArch64_relobj
<size
, big_endian
>* obj
=
3813 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3817 else if (et
== elfcpp::ET_DYN
)
3819 // Keep base implementation.
3820 Sized_dynobj
<size
, big_endian
>* obj
=
3821 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3827 gold_error(_("%s: unsupported ELF file type %d"),
3834 // Scan a relocation for stub generation.
3836 template<int size
, bool big_endian
>
3838 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3839 const Relocate_info
<size
, big_endian
>* relinfo
,
3840 unsigned int r_type
,
3841 const Sized_symbol
<size
>* gsym
,
3843 const Symbol_value
<size
>* psymval
,
3844 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3847 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3848 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3850 Symbol_value
<size
> symval
;
3853 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3854 get_reloc_property(r_type
);
3855 if (gsym
->use_plt_offset(arp
->reference_flags()))
3857 // This uses a PLT, change the symbol value.
3858 symval
.set_output_value(this->plt_address_for_global(gsym
));
3861 else if (gsym
->is_undefined())
3863 // There is no need to generate a stub symbol if the original symbol
3865 gold_debug(DEBUG_TARGET
,
3866 "stub: not creating a stub for undefined symbol %s in file %s",
3867 gsym
->name(), aarch64_relobj
->name().c_str());
3872 // Get the symbol value.
3873 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3875 // Owing to pipelining, the PC relative branches below actually skip
3876 // two instructions when the branch offset is 0.
3877 Address destination
= static_cast<Address
>(-1);
3880 case elfcpp::R_AARCH64_CALL26
:
3881 case elfcpp::R_AARCH64_JUMP26
:
3882 destination
= value
+ addend
;
3888 int stub_type
= The_reloc_stub::
3889 stub_type_for_reloc(r_type
, address
, destination
);
3890 if (stub_type
== ST_NONE
)
3893 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3894 gold_assert(stub_table
!= NULL
);
3896 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3897 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3900 stub
= new The_reloc_stub(stub_type
);
3901 stub_table
->add_reloc_stub(stub
, key
);
3903 stub
->set_destination_address(destination
);
3904 } // End of Target_aarch64::scan_reloc_for_stub
3907 // This function scans a relocation section for stub generation.
3908 // The template parameter Relocate must be a class type which provides
3909 // a single function, relocate(), which implements the machine
3910 // specific part of a relocation.
3912 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3913 // SHT_REL or SHT_RELA.
3915 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3916 // of relocs. OUTPUT_SECTION is the output section.
3917 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3918 // mapped to output offsets.
3920 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3921 // VIEW_SIZE is the size. These refer to the input section, unless
3922 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3923 // the output section.
3925 template<int size
, bool big_endian
>
3926 template<int sh_type
>
3928 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3929 const Relocate_info
<size
, big_endian
>* relinfo
,
3930 const unsigned char* prelocs
,
3932 Output_section
* /*output_section*/,
3933 bool /*needs_special_offset_handling*/,
3934 const unsigned char* /*view*/,
3935 Address view_address
,
3938 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3940 const int reloc_size
=
3941 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3942 AArch64_relobj
<size
, big_endian
>* object
=
3943 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3944 unsigned int local_count
= object
->local_symbol_count();
3946 gold::Default_comdat_behavior default_comdat_behavior
;
3947 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3949 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3951 Reltype
reloc(prelocs
);
3952 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3953 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3954 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3955 if (r_type
!= elfcpp::R_AARCH64_CALL26
3956 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3959 section_offset_type offset
=
3960 convert_to_section_size_type(reloc
.get_r_offset());
3963 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3964 reloc
.get_r_addend();
3966 const Sized_symbol
<size
>* sym
;
3967 Symbol_value
<size
> symval
;
3968 const Symbol_value
<size
> *psymval
;
3969 bool is_defined_in_discarded_section
;
3971 if (r_sym
< local_count
)
3974 psymval
= object
->local_symbol(r_sym
);
3976 // If the local symbol belongs to a section we are discarding,
3977 // and that section is a debug section, try to find the
3978 // corresponding kept section and map this symbol to its
3979 // counterpart in the kept section. The symbol must not
3980 // correspond to a section we are folding.
3982 shndx
= psymval
->input_shndx(&is_ordinary
);
3983 is_defined_in_discarded_section
=
3985 && shndx
!= elfcpp::SHN_UNDEF
3986 && !object
->is_section_included(shndx
)
3987 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3989 // We need to compute the would-be final value of this local
3991 if (!is_defined_in_discarded_section
)
3993 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3994 if (psymval
->is_section_symbol())
3995 symval
.set_is_section_symbol();
3996 typename
ObjType::Compute_final_local_value_status status
=
3997 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3999 if (status
== ObjType::CFLV_OK
)
4001 // Currently we cannot handle a branch to a target in
4002 // a merged section. If this is the case, issue an error
4003 // and also free the merge symbol value.
4004 if (!symval
.has_output_value())
4006 const std::string
& section_name
=
4007 object
->section_name(shndx
);
4008 object
->error(_("cannot handle branch to local %u "
4009 "in a merged section %s"),
4010 r_sym
, section_name
.c_str());
4016 // We cannot determine the final value.
4024 gsym
= object
->global_symbol(r_sym
);
4025 gold_assert(gsym
!= NULL
);
4026 if (gsym
->is_forwarder())
4027 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
4029 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
4030 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
4031 symval
.set_output_symtab_index(sym
->symtab_index());
4033 symval
.set_no_output_symtab_entry();
4035 // We need to compute the would-be final value of this global
4037 const Symbol_table
* symtab
= relinfo
->symtab
;
4038 const Sized_symbol
<size
>* sized_symbol
=
4039 symtab
->get_sized_symbol
<size
>(gsym
);
4040 Symbol_table::Compute_final_value_status status
;
4041 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4042 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
4044 // Skip this if the symbol has not output section.
4045 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
4047 symval
.set_output_value(value
);
4049 if (gsym
->type() == elfcpp::STT_TLS
)
4050 symval
.set_is_tls_symbol();
4051 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
4052 symval
.set_is_ifunc_symbol();
4055 is_defined_in_discarded_section
=
4056 (gsym
->is_defined_in_discarded_section()
4057 && gsym
->is_undefined());
4061 Symbol_value
<size
> symval2
;
4062 if (is_defined_in_discarded_section
)
4064 if (comdat_behavior
== CB_UNDETERMINED
)
4066 std::string name
= object
->section_name(relinfo
->data_shndx
);
4067 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
4069 if (comdat_behavior
== CB_PRETEND
)
4072 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4073 object
->map_to_kept_section(shndx
, &found
);
4075 symval2
.set_output_value(value
+ psymval
->input_value());
4077 symval2
.set_output_value(0);
4081 if (comdat_behavior
== CB_WARNING
)
4082 gold_warning_at_location(relinfo
, i
, offset
,
4083 _("relocation refers to discarded "
4085 symval2
.set_output_value(0);
4087 symval2
.set_no_output_symtab_entry();
4091 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
4092 addend
, view_address
+ offset
);
4093 } // End of iterating relocs in a section
4094 } // End of Target_aarch64::scan_reloc_section_for_stubs
4097 // Scan an input section for stub generation.
4099 template<int size
, bool big_endian
>
4101 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
4102 const Relocate_info
<size
, big_endian
>* relinfo
,
4103 unsigned int sh_type
,
4104 const unsigned char* prelocs
,
4106 Output_section
* output_section
,
4107 bool needs_special_offset_handling
,
4108 const unsigned char* view
,
4109 Address view_address
,
4110 section_size_type view_size
)
4112 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4113 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
4118 needs_special_offset_handling
,
4125 // Relocate a single reloc stub.
4127 template<int size
, bool big_endian
>
4128 void Target_aarch64
<size
, big_endian
>::
4129 relocate_reloc_stub(The_reloc_stub
* stub
,
4130 const The_relocate_info
*,
4132 unsigned char* view
,
4136 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
4137 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
4138 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
4140 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
4141 int insn_number
= stub
->insn_num();
4142 const uint32_t* insns
= stub
->insns();
4143 // Check the insns are really those stub insns.
4144 for (int i
= 0; i
< insn_number
; ++i
)
4146 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
4147 gold_assert(((uint32_t)insn
== insns
[i
]));
4150 Address dest
= stub
->destination_address();
4152 switch(stub
->type())
4154 case ST_ADRP_BRANCH
:
4156 // 1st reloc is ADR_PREL_PG_HI21
4157 The_reloc_functions_status status
=
4158 The_reloc_functions::adrp(view
, dest
, address
);
4159 // An error should never arise in the above step. If so, please
4160 // check 'aarch64_valid_for_adrp_p'.
4161 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4163 // 2nd reloc is ADD_ABS_LO12_NC
4164 const AArch64_reloc_property
* arp
=
4165 aarch64_reloc_property_table
->get_reloc_property(
4166 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
4167 gold_assert(arp
!= NULL
);
4168 status
= The_reloc_functions::template
4169 rela_general
<32>(view
+ 4, dest
, 0, arp
);
4170 // An error should never arise, it is an "_NC" relocation.
4171 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4175 case ST_LONG_BRANCH_ABS
:
4176 // 1st reloc is R_AARCH64_PREL64, at offset 8
4177 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
4180 case ST_LONG_BRANCH_PCREL
:
4182 // "PC" calculation is the 2nd insn in the stub.
4183 uint64_t offset
= dest
- (address
+ 4);
4184 // Offset is placed at offset 4 and 5.
4185 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
4195 // A class to handle the PLT data.
4196 // This is an abstract base class that handles most of the linker details
4197 // but does not know the actual contents of PLT entries. The derived
4198 // classes below fill in those details.
4200 template<int size
, bool big_endian
>
4201 class Output_data_plt_aarch64
: public Output_section_data
4204 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
4206 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4208 Output_data_plt_aarch64(Layout
* layout
,
4210 Output_data_got_aarch64
<size
, big_endian
>* got
,
4211 Output_data_space
* got_plt
,
4212 Output_data_space
* got_irelative
)
4213 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
4214 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
4215 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4216 { this->init(layout
); }
4218 // Initialize the PLT section.
4220 init(Layout
* layout
);
4222 // Add an entry to the PLT.
4224 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
4226 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4228 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
4229 Sized_relobj_file
<size
, big_endian
>* relobj
,
4230 unsigned int local_sym_index
);
4232 // Add the relocation for a PLT entry.
4234 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
4235 unsigned int got_offset
);
4237 // Add the reserved TLSDESC_PLT entry to the PLT.
4239 reserve_tlsdesc_entry(unsigned int got_offset
)
4240 { this->tlsdesc_got_offset_
= got_offset
; }
4242 // Return true if a TLSDESC_PLT entry has been reserved.
4244 has_tlsdesc_entry() const
4245 { return this->tlsdesc_got_offset_
!= -1U; }
4247 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4249 get_tlsdesc_got_offset() const
4250 { return this->tlsdesc_got_offset_
; }
4252 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4254 get_tlsdesc_plt_offset() const
4256 return (this->first_plt_entry_offset() +
4257 (this->count_
+ this->irelative_count_
)
4258 * this->get_plt_entry_size());
4261 // Return the .rela.plt section data.
4264 { return this->rel_
; }
4266 // Return where the TLSDESC relocations should go.
4268 rela_tlsdesc(Layout
*);
4270 // Return where the IRELATIVE relocations should go in the PLT
4273 rela_irelative(Symbol_table
*, Layout
*);
4275 // Return whether we created a section for IRELATIVE relocations.
4277 has_irelative_section() const
4278 { return this->irelative_rel_
!= NULL
; }
4280 // Return the number of PLT entries.
4283 { return this->count_
+ this->irelative_count_
; }
4285 // Return the offset of the first non-reserved PLT entry.
4287 first_plt_entry_offset() const
4288 { return this->do_first_plt_entry_offset(); }
4290 // Return the size of a PLT entry.
4292 get_plt_entry_size() const
4293 { return this->do_get_plt_entry_size(); }
4295 // Return the reserved tlsdesc entry size.
4297 get_plt_tlsdesc_entry_size() const
4298 { return this->do_get_plt_tlsdesc_entry_size(); }
4300 // Return the PLT address to use for a global symbol.
4302 address_for_global(const Symbol
*);
4304 // Return the PLT address to use for a local symbol.
4306 address_for_local(const Relobj
*, unsigned int symndx
);
4309 // Fill in the first PLT entry.
4311 fill_first_plt_entry(unsigned char* pov
,
4312 Address got_address
,
4313 Address plt_address
)
4314 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4316 // Fill in a normal PLT entry.
4318 fill_plt_entry(unsigned char* pov
,
4319 Address got_address
,
4320 Address plt_address
,
4321 unsigned int got_offset
,
4322 unsigned int plt_offset
)
4324 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4325 got_offset
, plt_offset
);
4328 // Fill in the reserved TLSDESC PLT entry.
4330 fill_tlsdesc_entry(unsigned char* pov
,
4331 Address gotplt_address
,
4332 Address plt_address
,
4334 unsigned int tlsdesc_got_offset
,
4335 unsigned int plt_offset
)
4337 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4338 tlsdesc_got_offset
, plt_offset
);
4341 virtual unsigned int
4342 do_first_plt_entry_offset() const = 0;
4344 virtual unsigned int
4345 do_get_plt_entry_size() const = 0;
4347 virtual unsigned int
4348 do_get_plt_tlsdesc_entry_size() const = 0;
4351 do_fill_first_plt_entry(unsigned char* pov
,
4353 Address plt_addr
) = 0;
4356 do_fill_plt_entry(unsigned char* pov
,
4357 Address got_address
,
4358 Address plt_address
,
4359 unsigned int got_offset
,
4360 unsigned int plt_offset
) = 0;
4363 do_fill_tlsdesc_entry(unsigned char* pov
,
4364 Address gotplt_address
,
4365 Address plt_address
,
4367 unsigned int tlsdesc_got_offset
,
4368 unsigned int plt_offset
) = 0;
4371 do_adjust_output_section(Output_section
* os
);
4373 // Write to a map file.
4375 do_print_to_mapfile(Mapfile
* mapfile
) const
4376 { mapfile
->print_output_data(this, _("** PLT")); }
4379 // Set the final size.
4381 set_final_data_size();
4383 // Write out the PLT data.
4385 do_write(Output_file
*);
4387 // The reloc section.
4388 Reloc_section
* rel_
;
4390 // The TLSDESC relocs, if necessary. These must follow the regular
4392 Reloc_section
* tlsdesc_rel_
;
4394 // The IRELATIVE relocs, if necessary. These must follow the
4395 // regular PLT relocations.
4396 Reloc_section
* irelative_rel_
;
4398 // The .got section.
4399 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4401 // The .got.plt section.
4402 Output_data_space
* got_plt_
;
4404 // The part of the .got.plt section used for IRELATIVE relocs.
4405 Output_data_space
* got_irelative_
;
4407 // The number of PLT entries.
4408 unsigned int count_
;
4410 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4411 // follow the regular PLT entries.
4412 unsigned int irelative_count_
;
4414 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4415 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4416 // indicates an offset is not allocated.
4417 unsigned int tlsdesc_got_offset_
;
4420 // Initialize the PLT section.
4422 template<int size
, bool big_endian
>
4424 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4426 this->rel_
= new Reloc_section(false);
4427 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4428 elfcpp::SHF_ALLOC
, this->rel_
,
4429 ORDER_DYNAMIC_PLT_RELOCS
, false);
4432 template<int size
, bool big_endian
>
4434 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4437 os
->set_entsize(this->get_plt_entry_size());
4440 // Add an entry to the PLT.
4442 template<int size
, bool big_endian
>
4444 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4445 Layout
* layout
, Symbol
* gsym
)
4447 gold_assert(!gsym
->has_plt_offset());
4449 unsigned int* pcount
;
4450 unsigned int plt_reserved
;
4451 Output_section_data_build
* got
;
4453 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4454 && gsym
->can_use_relative_reloc(false))
4456 pcount
= &this->irelative_count_
;
4458 got
= this->got_irelative_
;
4462 pcount
= &this->count_
;
4463 plt_reserved
= this->first_plt_entry_offset();
4464 got
= this->got_plt_
;
4467 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4472 section_offset_type got_offset
= got
->current_data_size();
4474 // Every PLT entry needs a GOT entry which points back to the PLT
4475 // entry (this will be changed by the dynamic linker, normally
4476 // lazily when the function is called).
4477 got
->set_current_data_size(got_offset
+ size
/ 8);
4479 // Every PLT entry needs a reloc.
4480 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4482 // Note that we don't need to save the symbol. The contents of the
4483 // PLT are independent of which symbols are used. The symbols only
4484 // appear in the relocations.
4487 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4490 template<int size
, bool big_endian
>
4492 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4493 Symbol_table
* symtab
,
4495 Sized_relobj_file
<size
, big_endian
>* relobj
,
4496 unsigned int local_sym_index
)
4498 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4499 ++this->irelative_count_
;
4501 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4503 // Every PLT entry needs a GOT entry which points back to the PLT
4505 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4507 // Every PLT entry needs a reloc.
4508 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4509 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4510 elfcpp::R_AARCH64_IRELATIVE
,
4511 this->got_irelative_
, got_offset
, 0);
4516 // Add the relocation for a PLT entry.
4518 template<int size
, bool big_endian
>
4520 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4521 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4523 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4524 && gsym
->can_use_relative_reloc(false))
4526 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4527 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4528 this->got_irelative_
, got_offset
, 0);
4532 gsym
->set_needs_dynsym_entry();
4533 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4538 // Return where the TLSDESC relocations should go, creating it if
4539 // necessary. These follow the JUMP_SLOT relocations.
4541 template<int size
, bool big_endian
>
4542 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4543 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4545 if (this->tlsdesc_rel_
== NULL
)
4547 this->tlsdesc_rel_
= new Reloc_section(false);
4548 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4549 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4550 ORDER_DYNAMIC_PLT_RELOCS
, false);
4551 gold_assert(this->tlsdesc_rel_
->output_section()
4552 == this->rel_
->output_section());
4554 return this->tlsdesc_rel_
;
4557 // Return where the IRELATIVE relocations should go in the PLT. These
4558 // follow the JUMP_SLOT and the TLSDESC relocations.
4560 template<int size
, bool big_endian
>
4561 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4562 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4565 if (this->irelative_rel_
== NULL
)
4567 // Make sure we have a place for the TLSDESC relocations, in
4568 // case we see any later on.
4569 this->rela_tlsdesc(layout
);
4570 this->irelative_rel_
= new Reloc_section(false);
4571 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4572 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4573 ORDER_DYNAMIC_PLT_RELOCS
, false);
4574 gold_assert(this->irelative_rel_
->output_section()
4575 == this->rel_
->output_section());
4577 if (parameters
->doing_static_link())
4579 // A statically linked executable will only have a .rela.plt
4580 // section to hold R_AARCH64_IRELATIVE relocs for
4581 // STT_GNU_IFUNC symbols. The library will use these
4582 // symbols to locate the IRELATIVE relocs at program startup
4584 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4585 Symbol_table::PREDEFINED
,
4586 this->irelative_rel_
, 0, 0,
4587 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4588 elfcpp::STV_HIDDEN
, 0, false, true);
4589 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4590 Symbol_table::PREDEFINED
,
4591 this->irelative_rel_
, 0, 0,
4592 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4593 elfcpp::STV_HIDDEN
, 0, true, true);
4596 return this->irelative_rel_
;
4599 // Return the PLT address to use for a global symbol.
4601 template<int size
, bool big_endian
>
4603 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4606 uint64_t offset
= 0;
4607 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4608 && gsym
->can_use_relative_reloc(false))
4609 offset
= (this->first_plt_entry_offset() +
4610 this->count_
* this->get_plt_entry_size());
4611 return this->address() + offset
+ gsym
->plt_offset();
4614 // Return the PLT address to use for a local symbol. These are always
4615 // IRELATIVE relocs.
4617 template<int size
, bool big_endian
>
4619 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4620 const Relobj
* object
,
4623 return (this->address()
4624 + this->first_plt_entry_offset()
4625 + this->count_
* this->get_plt_entry_size()
4626 + object
->local_plt_offset(r_sym
));
4629 // Set the final size.
4631 template<int size
, bool big_endian
>
4633 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4635 unsigned int count
= this->count_
+ this->irelative_count_
;
4636 unsigned int extra_size
= 0;
4637 if (this->has_tlsdesc_entry())
4638 extra_size
+= this->get_plt_tlsdesc_entry_size();
4639 this->set_data_size(this->first_plt_entry_offset()
4640 + count
* this->get_plt_entry_size()
4644 template<int size
, bool big_endian
>
4645 class Output_data_plt_aarch64_standard
:
4646 public Output_data_plt_aarch64
<size
, big_endian
>
4649 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4650 Output_data_plt_aarch64_standard(
4652 Output_data_got_aarch64
<size
, big_endian
>* got
,
4653 Output_data_space
* got_plt
,
4654 Output_data_space
* got_irelative
)
4655 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4662 // Return the offset of the first non-reserved PLT entry.
4663 virtual unsigned int
4664 do_first_plt_entry_offset() const
4665 { return this->first_plt_entry_size
; }
4667 // Return the size of a PLT entry
4668 virtual unsigned int
4669 do_get_plt_entry_size() const
4670 { return this->plt_entry_size
; }
4672 // Return the size of a tlsdesc entry
4673 virtual unsigned int
4674 do_get_plt_tlsdesc_entry_size() const
4675 { return this->plt_tlsdesc_entry_size
; }
4678 do_fill_first_plt_entry(unsigned char* pov
,
4679 Address got_address
,
4680 Address plt_address
);
4683 do_fill_plt_entry(unsigned char* pov
,
4684 Address got_address
,
4685 Address plt_address
,
4686 unsigned int got_offset
,
4687 unsigned int plt_offset
);
4690 do_fill_tlsdesc_entry(unsigned char* pov
,
4691 Address gotplt_address
,
4692 Address plt_address
,
4694 unsigned int tlsdesc_got_offset
,
4695 unsigned int plt_offset
);
4698 // The size of the first plt entry size.
4699 static const int first_plt_entry_size
= 32;
4700 // The size of the plt entry size.
4701 static const int plt_entry_size
= 16;
4702 // The size of the plt tlsdesc entry size.
4703 static const int plt_tlsdesc_entry_size
= 32;
4704 // Template for the first PLT entry.
4705 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4706 // Template for subsequent PLT entries.
4707 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4708 // The reserved TLSDESC entry in the PLT for an executable.
4709 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4712 // The first entry in the PLT for an executable.
4716 Output_data_plt_aarch64_standard
<32, false>::
4717 first_plt_entry
[first_plt_entry_size
/ 4] =
4719 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4720 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4721 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4722 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4723 0xd61f0220, /* br x17 */
4724 0xd503201f, /* nop */
4725 0xd503201f, /* nop */
4726 0xd503201f, /* nop */
4732 Output_data_plt_aarch64_standard
<32, true>::
4733 first_plt_entry
[first_plt_entry_size
/ 4] =
4735 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4736 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4737 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4738 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4739 0xd61f0220, /* br x17 */
4740 0xd503201f, /* nop */
4741 0xd503201f, /* nop */
4742 0xd503201f, /* nop */
4748 Output_data_plt_aarch64_standard
<64, false>::
4749 first_plt_entry
[first_plt_entry_size
/ 4] =
4751 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4752 0x90000010, /* adrp x16, PLT_GOT+16 */
4753 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4754 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4755 0xd61f0220, /* br x17 */
4756 0xd503201f, /* nop */
4757 0xd503201f, /* nop */
4758 0xd503201f, /* nop */
4764 Output_data_plt_aarch64_standard
<64, true>::
4765 first_plt_entry
[first_plt_entry_size
/ 4] =
4767 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4768 0x90000010, /* adrp x16, PLT_GOT+16 */
4769 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4770 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4771 0xd61f0220, /* br x17 */
4772 0xd503201f, /* nop */
4773 0xd503201f, /* nop */
4774 0xd503201f, /* nop */
4780 Output_data_plt_aarch64_standard
<32, false>::
4781 plt_entry
[plt_entry_size
/ 4] =
4783 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4784 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4785 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4786 0xd61f0220, /* br x17. */
4792 Output_data_plt_aarch64_standard
<32, true>::
4793 plt_entry
[plt_entry_size
/ 4] =
4795 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4796 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4797 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4798 0xd61f0220, /* br x17. */
4804 Output_data_plt_aarch64_standard
<64, false>::
4805 plt_entry
[plt_entry_size
/ 4] =
4807 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4808 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4809 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4810 0xd61f0220, /* br x17. */
4816 Output_data_plt_aarch64_standard
<64, true>::
4817 plt_entry
[plt_entry_size
/ 4] =
4819 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4820 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4821 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4822 0xd61f0220, /* br x17. */
4826 template<int size
, bool big_endian
>
4828 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4830 Address got_address
,
4831 Address plt_address
)
4833 // PLT0 of the small PLT looks like this in ELF64 -
4834 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4835 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4836 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4838 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4839 // GOTPLT entry for this.
4841 // PLT0 will be slightly different in ELF32 due to different got entry
4843 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4844 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4846 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4847 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4848 // FIXME: This only works for 64bit
4849 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4850 gotplt_2nd_ent
, plt_address
+ 4);
4852 // Fill in R_AARCH64_LDST8_LO12
4853 elfcpp::Swap
<32, big_endian
>::writeval(
4855 ((this->first_plt_entry
[2] & 0xffc003ff)
4856 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4858 // Fill in R_AARCH64_ADD_ABS_LO12
4859 elfcpp::Swap
<32, big_endian
>::writeval(
4861 ((this->first_plt_entry
[3] & 0xffc003ff)
4862 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4866 // Subsequent entries in the PLT for an executable.
4867 // FIXME: This only works for 64bit
4869 template<int size
, bool big_endian
>
4871 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4873 Address got_address
,
4874 Address plt_address
,
4875 unsigned int got_offset
,
4876 unsigned int plt_offset
)
4878 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4880 Address gotplt_entry_address
= got_address
+ got_offset
;
4881 Address plt_entry_address
= plt_address
+ plt_offset
;
4883 // Fill in R_AARCH64_PCREL_ADR_HI21
4884 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4886 gotplt_entry_address
,
4889 // Fill in R_AARCH64_LDST64_ABS_LO12
4890 elfcpp::Swap
<32, big_endian
>::writeval(
4892 ((this->plt_entry
[1] & 0xffc003ff)
4893 | ((gotplt_entry_address
& 0xff8) << 7)));
4895 // Fill in R_AARCH64_ADD_ABS_LO12
4896 elfcpp::Swap
<32, big_endian
>::writeval(
4898 ((this->plt_entry
[2] & 0xffc003ff)
4899 | ((gotplt_entry_address
& 0xfff) <<10)));
4906 Output_data_plt_aarch64_standard
<32, false>::
4907 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4909 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4910 0x90000002, /* adrp x2, 0 */
4911 0x90000003, /* adrp x3, 0 */
4912 0xb9400042, /* ldr w2, [w2, #0] */
4913 0x11000063, /* add w3, w3, 0 */
4914 0xd61f0040, /* br x2 */
4915 0xd503201f, /* nop */
4916 0xd503201f, /* nop */
4921 Output_data_plt_aarch64_standard
<32, true>::
4922 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4924 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4925 0x90000002, /* adrp x2, 0 */
4926 0x90000003, /* adrp x3, 0 */
4927 0xb9400042, /* ldr w2, [w2, #0] */
4928 0x11000063, /* add w3, w3, 0 */
4929 0xd61f0040, /* br x2 */
4930 0xd503201f, /* nop */
4931 0xd503201f, /* nop */
4936 Output_data_plt_aarch64_standard
<64, false>::
4937 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4939 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4940 0x90000002, /* adrp x2, 0 */
4941 0x90000003, /* adrp x3, 0 */
4942 0xf9400042, /* ldr x2, [x2, #0] */
4943 0x91000063, /* add x3, x3, 0 */
4944 0xd61f0040, /* br x2 */
4945 0xd503201f, /* nop */
4946 0xd503201f, /* nop */
4951 Output_data_plt_aarch64_standard
<64, true>::
4952 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4954 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4955 0x90000002, /* adrp x2, 0 */
4956 0x90000003, /* adrp x3, 0 */
4957 0xf9400042, /* ldr x2, [x2, #0] */
4958 0x91000063, /* add x3, x3, 0 */
4959 0xd61f0040, /* br x2 */
4960 0xd503201f, /* nop */
4961 0xd503201f, /* nop */
4964 template<int size
, bool big_endian
>
4966 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4968 Address gotplt_address
,
4969 Address plt_address
,
4971 unsigned int tlsdesc_got_offset
,
4972 unsigned int plt_offset
)
4974 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4976 // move DT_TLSDESC_GOT address into x2
4977 // move .got.plt address into x3
4978 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4979 Address plt_entry_address
= plt_address
+ plt_offset
;
4981 // R_AARCH64_ADR_PREL_PG_HI21
4982 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4985 plt_entry_address
+ 4);
4987 // R_AARCH64_ADR_PREL_PG_HI21
4988 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4991 plt_entry_address
+ 8);
4993 // R_AARCH64_LDST64_ABS_LO12
4994 elfcpp::Swap
<32, big_endian
>::writeval(
4996 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4997 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4999 // R_AARCH64_ADD_ABS_LO12
5000 elfcpp::Swap
<32, big_endian
>::writeval(
5002 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
5003 | ((gotplt_address
& 0xfff) << 10)));
5006 // Write out the PLT. This uses the hand-coded instructions above,
5007 // and adjusts them as needed. This is specified by the AMD64 ABI.
5009 template<int size
, bool big_endian
>
5011 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
5013 const off_t offset
= this->offset();
5014 const section_size_type oview_size
=
5015 convert_to_section_size_type(this->data_size());
5016 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
5018 const off_t got_file_offset
= this->got_plt_
->offset();
5019 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
5020 == this->got_irelative_
->offset());
5022 const section_size_type got_size
=
5023 convert_to_section_size_type(this->got_plt_
->data_size()
5024 + this->got_irelative_
->data_size());
5025 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
5028 unsigned char* pov
= oview
;
5030 // The base address of the .plt section.
5031 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
5032 // The base address of the PLT portion of the .got section.
5033 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
5034 = this->got_plt_
->address();
5036 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
5037 pov
+= this->first_plt_entry_offset();
5039 // The first three entries in .got.plt are reserved.
5040 unsigned char* got_pov
= got_view
;
5041 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
5042 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5044 unsigned int plt_offset
= this->first_plt_entry_offset();
5045 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5046 const unsigned int count
= this->count_
+ this->irelative_count_
;
5047 for (unsigned int plt_index
= 0;
5050 pov
+= this->get_plt_entry_size(),
5051 got_pov
+= size
/ 8,
5052 plt_offset
+= this->get_plt_entry_size(),
5053 got_offset
+= size
/ 8)
5055 // Set and adjust the PLT entry itself.
5056 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
5057 got_offset
, plt_offset
);
5059 // Set the entry in the GOT, which points to plt0.
5060 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
5063 if (this->has_tlsdesc_entry())
5065 // Set and adjust the reserved TLSDESC PLT entry.
5066 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
5067 // The base address of the .base section.
5068 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
5069 this->got_
->address();
5070 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
5071 tlsdesc_got_offset
, plt_offset
);
5072 pov
+= this->get_plt_tlsdesc_entry_size();
5075 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
5076 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
5078 of
->write_output_view(offset
, oview_size
, oview
);
5079 of
->write_output_view(got_file_offset
, got_size
, got_view
);
5082 // Telling how to update the immediate field of an instruction.
5083 struct AArch64_howto
5085 // The immediate field mask.
5086 elfcpp::Elf_Xword dst_mask
;
5088 // The offset to apply relocation immediate
5091 // The second part offset, if the immediate field has two parts.
5092 // -1 if the immediate field has only one part.
5096 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
5098 {0, -1, -1}, // DATA
5099 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
5100 {0xffffe0, 5, -1}, // LD [23:5]-imm19
5101 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
5102 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
5103 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
5104 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
5105 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
5106 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
5107 {0x3ffffff, 0, -1}, // B [25:0]-imm26
5108 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
5111 // AArch64 relocate function class
5113 template<int size
, bool big_endian
>
5114 class AArch64_relocate_functions
5119 STATUS_OKAY
, // No error during relocation.
5120 STATUS_OVERFLOW
, // Relocation overflow.
5121 STATUS_BAD_RELOC
, // Relocation cannot be applied.
5124 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
5125 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
5126 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
5127 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
5128 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
5129 typedef Stub_table
<size
, big_endian
> The_stub_table
;
5130 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
5131 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
5133 // Return the page address of the address.
5134 // Page(address) = address & ~0xFFF
5136 static inline AArch64_valtype
5137 Page(Address address
)
5139 return (address
& (~static_cast<Address
>(0xFFF)));
5143 // Update instruction (pointed by view) with selected bits (immed).
5144 // val = (val & ~dst_mask) | (immed << doffset)
5146 template<int valsize
>
5148 update_view(unsigned char* view
,
5149 AArch64_valtype immed
,
5150 elfcpp::Elf_Xword doffset
,
5151 elfcpp::Elf_Xword dst_mask
)
5153 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5154 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5155 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5157 // Clear immediate fields.
5159 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5160 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5163 // Update two parts of an instruction (pointed by view) with selected
5164 // bits (immed1 and immed2).
5165 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5167 template<int valsize
>
5169 update_view_two_parts(
5170 unsigned char* view
,
5171 AArch64_valtype immed1
,
5172 AArch64_valtype immed2
,
5173 elfcpp::Elf_Xword doffset1
,
5174 elfcpp::Elf_Xword doffset2
,
5175 elfcpp::Elf_Xword dst_mask
)
5177 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5178 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5179 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5181 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5182 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
5183 (immed2
<< doffset2
)));
5186 // Update adr or adrp instruction with immed.
5187 // In adr and adrp: [30:29] immlo [23:5] immhi
5190 update_adr(unsigned char* view
, AArch64_valtype immed
)
5192 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
5193 This::template update_view_two_parts
<32>(
5196 (immed
& 0x1ffffc) >> 2,
5202 // Update movz/movn instruction with bits immed.
5203 // Set instruction to movz if is_movz is true, otherwise set instruction
5207 update_movnz(unsigned char* view
,
5208 AArch64_valtype immed
,
5211 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
5212 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5213 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
5215 const elfcpp::Elf_Xword doffset
=
5216 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
5217 const elfcpp::Elf_Xword dst_mask
=
5218 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
5220 // Clear immediate fields and opc code.
5221 val
&= ~(dst_mask
| (0x3 << 29));
5223 // Set instruction to movz or movn.
5224 // movz: [30:29] is 10 movn: [30:29] is 00
5228 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
5229 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5234 // Update selected bits in text.
5236 template<int valsize
>
5237 static inline typename
This::Status
5238 reloc_common(unsigned char* view
, Address x
,
5239 const AArch64_reloc_property
* reloc_property
)
5241 // Select bits from X.
5242 Address immed
= reloc_property
->select_x_value(x
);
5245 const AArch64_reloc_property::Reloc_inst inst
=
5246 reloc_property
->reloc_inst();
5247 // If it is a data relocation or instruction has 2 parts of immediate
5248 // fields, you should not call pcrela_general.
5249 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
5250 aarch64_howto
[inst
].doffset
!= -1);
5251 This::template update_view
<valsize
>(view
, immed
,
5252 aarch64_howto
[inst
].doffset
,
5253 aarch64_howto
[inst
].dst_mask
);
5255 // Do check overflow or alignment if needed.
5256 return (reloc_property
->checkup_x_value(x
)
5258 : This::STATUS_OVERFLOW
);
5261 // Construct a B insn. Note, although we group it here with other relocation
5262 // operation, there is actually no 'relocation' involved here.
5264 construct_b(unsigned char* view
, unsigned int branch_offset
)
5266 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5270 // Do a simple rela relocation at unaligned addresses.
5272 template<int valsize
>
5273 static inline typename
This::Status
5274 rela_ua(unsigned char* view
,
5275 const Sized_relobj_file
<size
, big_endian
>* object
,
5276 const Symbol_value
<size
>* psymval
,
5277 AArch64_valtype addend
,
5278 const AArch64_reloc_property
* reloc_property
)
5280 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5282 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5283 psymval
->value(object
, addend
);
5284 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5285 static_cast<Valtype
>(x
));
5286 return (reloc_property
->checkup_x_value(x
)
5288 : This::STATUS_OVERFLOW
);
5291 // Do a simple pc-relative relocation at unaligned addresses.
5293 template<int valsize
>
5294 static inline typename
This::Status
5295 pcrela_ua(unsigned char* view
,
5296 const Sized_relobj_file
<size
, big_endian
>* object
,
5297 const Symbol_value
<size
>* psymval
,
5298 AArch64_valtype addend
,
5300 const AArch64_reloc_property
* reloc_property
)
5302 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5304 Address x
= psymval
->value(object
, addend
) - address
;
5305 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5306 static_cast<Valtype
>(x
));
5307 return (reloc_property
->checkup_x_value(x
)
5309 : This::STATUS_OVERFLOW
);
5312 // Do a simple rela relocation at aligned addresses.
5314 template<int valsize
>
5315 static inline typename
This::Status
5317 unsigned char* view
,
5318 const Sized_relobj_file
<size
, big_endian
>* object
,
5319 const Symbol_value
<size
>* psymval
,
5320 AArch64_valtype addend
,
5321 const AArch64_reloc_property
* reloc_property
)
5323 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5324 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5325 Address x
= psymval
->value(object
, addend
);
5326 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5327 return (reloc_property
->checkup_x_value(x
)
5329 : This::STATUS_OVERFLOW
);
5332 // Do relocate. Update selected bits in text.
5333 // new_val = (val & ~dst_mask) | (immed << doffset)
5335 template<int valsize
>
5336 static inline typename
This::Status
5337 rela_general(unsigned char* view
,
5338 const Sized_relobj_file
<size
, big_endian
>* object
,
5339 const Symbol_value
<size
>* psymval
,
5340 AArch64_valtype addend
,
5341 const AArch64_reloc_property
* reloc_property
)
5343 // Calculate relocation.
5344 Address x
= psymval
->value(object
, addend
);
5345 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5348 // Do relocate. Update selected bits in text.
5349 // new val = (val & ~dst_mask) | (immed << doffset)
5351 template<int valsize
>
5352 static inline typename
This::Status
5354 unsigned char* view
,
5356 AArch64_valtype addend
,
5357 const AArch64_reloc_property
* reloc_property
)
5359 // Calculate relocation.
5360 Address x
= s
+ addend
;
5361 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5364 // Do address relative relocate. Update selected bits in text.
5365 // new val = (val & ~dst_mask) | (immed << doffset)
5367 template<int valsize
>
5368 static inline typename
This::Status
5370 unsigned char* view
,
5371 const Sized_relobj_file
<size
, big_endian
>* object
,
5372 const Symbol_value
<size
>* psymval
,
5373 AArch64_valtype addend
,
5375 const AArch64_reloc_property
* reloc_property
)
5377 // Calculate relocation.
5378 Address x
= psymval
->value(object
, addend
) - address
;
5379 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5383 // Calculate (S + A) - address, update adr instruction.
5385 static inline typename
This::Status
5386 adr(unsigned char* view
,
5387 const Sized_relobj_file
<size
, big_endian
>* object
,
5388 const Symbol_value
<size
>* psymval
,
5391 const AArch64_reloc_property
* /* reloc_property */)
5393 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5394 // Pick bits [20:0] of X.
5395 AArch64_valtype immed
= x
& 0x1fffff;
5396 update_adr(view
, immed
);
5397 // Check -2^20 <= X < 2^20
5398 return (size
== 64 && Bits
<21>::has_overflow((x
))
5399 ? This::STATUS_OVERFLOW
5400 : This::STATUS_OKAY
);
5403 // Calculate PG(S+A) - PG(address), update adrp instruction.
5404 // R_AARCH64_ADR_PREL_PG_HI21
5406 static inline typename
This::Status
5408 unsigned char* view
,
5412 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5413 // Pick [32:12] of X.
5414 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5415 update_adr(view
, immed
);
5416 // Check -2^32 <= X < 2^32
5417 return (size
== 64 && Bits
<33>::has_overflow((x
))
5418 ? This::STATUS_OVERFLOW
5419 : This::STATUS_OKAY
);
5422 // Calculate PG(S+A) - PG(address), update adrp instruction.
5423 // R_AARCH64_ADR_PREL_PG_HI21
5425 static inline typename
This::Status
5426 adrp(unsigned char* view
,
5427 const Sized_relobj_file
<size
, big_endian
>* object
,
5428 const Symbol_value
<size
>* psymval
,
5431 const AArch64_reloc_property
* reloc_property
)
5433 Address sa
= psymval
->value(object
, addend
);
5434 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5435 // Pick [32:12] of X.
5436 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5437 update_adr(view
, immed
);
5438 return (reloc_property
->checkup_x_value(x
)
5440 : This::STATUS_OVERFLOW
);
5443 // Update mov[n/z] instruction. Check overflow if needed.
5444 // If X >=0, set the instruction to movz and its immediate value to the
5446 // If X < 0, set the instruction to movn and its immediate value to
5447 // NOT (selected bits of).
5449 static inline typename
This::Status
5450 movnz(unsigned char* view
,
5452 const AArch64_reloc_property
* reloc_property
)
5454 // Select bits from X.
5457 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5458 if (static_cast<SignedW
>(x
) >= 0)
5460 immed
= reloc_property
->select_x_value(x
);
5465 immed
= reloc_property
->select_x_value(~x
);;
5469 // Update movnz instruction.
5470 update_movnz(view
, immed
, is_movz
);
5472 // Do check overflow or alignment if needed.
5473 return (reloc_property
->checkup_x_value(x
)
5475 : This::STATUS_OVERFLOW
);
5479 maybe_apply_stub(unsigned int,
5480 const The_relocate_info
*,
5484 const Sized_symbol
<size
>*,
5485 const Symbol_value
<size
>*,
5486 const Sized_relobj_file
<size
, big_endian
>*,
5489 }; // End of AArch64_relocate_functions
5492 // For a certain relocation type (usually jump/branch), test to see if the
5493 // destination needs a stub to fulfil. If so, re-route the destination of the
5494 // original instruction to the stub, note, at this time, the stub has already
5497 template<int size
, bool big_endian
>
5499 AArch64_relocate_functions
<size
, big_endian
>::
5500 maybe_apply_stub(unsigned int r_type
,
5501 const The_relocate_info
* relinfo
,
5502 const The_rela
& rela
,
5503 unsigned char* view
,
5505 const Sized_symbol
<size
>* gsym
,
5506 const Symbol_value
<size
>* psymval
,
5507 const Sized_relobj_file
<size
, big_endian
>* object
,
5508 section_size_type current_group_size
)
5510 if (parameters
->options().relocatable())
5513 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5514 Address branch_target
= psymval
->value(object
, 0) + addend
;
5516 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5517 if (stub_type
== ST_NONE
)
5520 const The_aarch64_relobj
* aarch64_relobj
=
5521 static_cast<const The_aarch64_relobj
*>(object
);
5522 const AArch64_reloc_property
* arp
=
5523 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5524 gold_assert(arp
!= NULL
);
5526 // We don't create stubs for undefined symbols, but do for weak.
5528 && !gsym
->use_plt_offset(arp
->reference_flags())
5529 && gsym
->is_undefined())
5531 gold_debug(DEBUG_TARGET
,
5532 "stub: looking for a stub for undefined symbol %s in file %s",
5533 gsym
->name(), aarch64_relobj
->name().c_str());
5537 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5538 gold_assert(stub_table
!= NULL
);
5540 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5541 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5542 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5543 gold_assert(stub
!= NULL
);
5545 Address new_branch_target
= stub_table
->address() + stub
->offset();
5546 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5547 new_branch_target
- address
;
5548 typename
This::Status status
= This::template
5549 rela_general
<32>(view
, branch_offset
, 0, arp
);
5550 if (status
!= This::STATUS_OKAY
)
5551 gold_error(_("Stub is too far away, try a smaller value "
5552 "for '--stub-group-size'. The current value is 0x%lx."),
5553 static_cast<unsigned long>(current_group_size
));
5558 // Group input sections for stub generation.
5560 // We group input sections in an output section so that the total size,
5561 // including any padding space due to alignment is smaller than GROUP_SIZE
5562 // unless the only input section in group is bigger than GROUP_SIZE already.
5563 // Then an ARM stub table is created to follow the last input section
5564 // in group. For each group an ARM stub table is created an is placed
5565 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5566 // extend the group after the stub table.
5568 template<int size
, bool big_endian
>
5570 Target_aarch64
<size
, big_endian
>::group_sections(
5572 section_size_type group_size
,
5573 bool stubs_always_after_branch
,
5576 // Group input sections and insert stub table
5577 Layout::Section_list section_list
;
5578 layout
->get_executable_sections(§ion_list
);
5579 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5580 p
!= section_list
.end();
5583 AArch64_output_section
<size
, big_endian
>* output_section
=
5584 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5585 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5591 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5592 // section of RELOBJ.
5594 template<int size
, bool big_endian
>
5595 AArch64_input_section
<size
, big_endian
>*
5596 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5597 Relobj
* relobj
, unsigned int shndx
) const
5599 Section_id
sid(relobj
, shndx
);
5600 typename
AArch64_input_section_map::const_iterator p
=
5601 this->aarch64_input_section_map_
.find(sid
);
5602 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5606 // Make a new AArch64_input_section object.
5608 template<int size
, bool big_endian
>
5609 AArch64_input_section
<size
, big_endian
>*
5610 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5611 Relobj
* relobj
, unsigned int shndx
)
5613 Section_id
sid(relobj
, shndx
);
5615 AArch64_input_section
<size
, big_endian
>* input_section
=
5616 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5617 input_section
->init();
5619 // Register new AArch64_input_section in map for look-up.
5620 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5621 this->aarch64_input_section_map_
.insert(
5622 std::make_pair(sid
, input_section
));
5624 // Make sure that it we have not created another AArch64_input_section
5625 // for this input section already.
5626 gold_assert(ins
.second
);
5628 return input_section
;
5632 // Relaxation hook. This is where we do stub generation.
5634 template<int size
, bool big_endian
>
5636 Target_aarch64
<size
, big_endian
>::do_relax(
5638 const Input_objects
* input_objects
,
5639 Symbol_table
* symtab
,
5643 gold_assert(!parameters
->options().relocatable());
5646 // We don't handle negative stub_group_size right now.
5647 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5648 if (this->stub_group_size_
== 1)
5650 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5651 // will fail to link. The user will have to relink with an explicit
5652 // group size option.
5653 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5656 group_sections(layout
, this->stub_group_size_
, true, task
);
5660 // If this is not the first pass, addresses and file offsets have
5661 // been reset at this point, set them here.
5662 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5663 sp
!= this->stub_tables_
.end(); ++sp
)
5665 The_stub_table
* stt
= *sp
;
5666 The_aarch64_input_section
* owner
= stt
->owner();
5667 off_t off
= align_address(owner
->original_size(),
5669 stt
->set_address_and_file_offset(owner
->address() + off
,
5670 owner
->offset() + off
);
5674 // Scan relocs for relocation stubs
5675 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5676 op
!= input_objects
->relobj_end();
5679 The_aarch64_relobj
* aarch64_relobj
=
5680 static_cast<The_aarch64_relobj
*>(*op
);
5681 // Lock the object so we can read from it. This is only called
5682 // single-threaded from Layout::finalize, so it is OK to lock.
5683 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5684 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5687 bool any_stub_table_changed
= false;
5688 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5689 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5691 The_stub_table
* stub_table
= *siter
;
5692 if (stub_table
->update_data_size_changed_p())
5694 The_aarch64_input_section
* owner
= stub_table
->owner();
5695 uint64_t address
= owner
->address();
5696 off_t offset
= owner
->offset();
5697 owner
->reset_address_and_file_offset();
5698 owner
->set_address_and_file_offset(address
, offset
);
5700 any_stub_table_changed
= true;
5704 // Do not continue relaxation.
5705 bool continue_relaxation
= any_stub_table_changed
;
5706 if (!continue_relaxation
)
5707 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5708 (sp
!= this->stub_tables_
.end());
5710 (*sp
)->finalize_stubs();
5712 return continue_relaxation
;
5716 // Make a new Stub_table.
5718 template<int size
, bool big_endian
>
5719 Stub_table
<size
, big_endian
>*
5720 Target_aarch64
<size
, big_endian
>::new_stub_table(
5721 AArch64_input_section
<size
, big_endian
>* owner
)
5723 Stub_table
<size
, big_endian
>* stub_table
=
5724 new Stub_table
<size
, big_endian
>(owner
);
5725 stub_table
->set_address(align_address(
5726 owner
->address() + owner
->data_size(), 8));
5727 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5728 stub_table
->finalize_data_size();
5730 this->stub_tables_
.push_back(stub_table
);
5736 template<int size
, bool big_endian
>
5738 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5739 void* arg
, unsigned int r_type
, uint64_t) const
5741 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5742 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5743 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5744 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5745 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5746 gold_assert(psymval
->is_tls_symbol());
5747 // The value of a TLS symbol is the offset in the TLS segment.
5748 return psymval
->value(ti
.object
, 0);
5751 // Return the number of entries in the PLT.
5753 template<int size
, bool big_endian
>
5755 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5757 if (this->plt_
== NULL
)
5759 return this->plt_
->entry_count();
5762 // Return the offset of the first non-reserved PLT entry.
5764 template<int size
, bool big_endian
>
5766 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5768 return this->plt_
->first_plt_entry_offset();
5771 // Return the size of each PLT entry.
5773 template<int size
, bool big_endian
>
5775 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5777 return this->plt_
->get_plt_entry_size();
5780 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5782 template<int size
, bool big_endian
>
5784 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5785 Symbol_table
* symtab
, Layout
* layout
)
5787 if (this->tls_base_symbol_defined_
)
5790 Output_segment
* tls_segment
= layout
->tls_segment();
5791 if (tls_segment
!= NULL
)
5793 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5794 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5795 Symbol_table::PREDEFINED
,
5799 elfcpp::STV_HIDDEN
, 0,
5800 Symbol::SEGMENT_START
,
5803 this->tls_base_symbol_defined_
= true;
5806 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5808 template<int size
, bool big_endian
>
5810 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5811 Symbol_table
* symtab
, Layout
* layout
)
5813 if (this->plt_
== NULL
)
5814 this->make_plt_section(symtab
, layout
);
5816 if (!this->plt_
->has_tlsdesc_entry())
5818 // Allocate the TLSDESC_GOT entry.
5819 Output_data_got_aarch64
<size
, big_endian
>* got
=
5820 this->got_section(symtab
, layout
);
5821 unsigned int got_offset
= got
->add_constant(0);
5823 // Allocate the TLSDESC_PLT entry.
5824 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5828 // Create a GOT entry for the TLS module index.
5830 template<int size
, bool big_endian
>
5832 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5833 Symbol_table
* symtab
, Layout
* layout
,
5834 Sized_relobj_file
<size
, big_endian
>* object
)
5836 if (this->got_mod_index_offset_
== -1U)
5838 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5839 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5840 Output_data_got_aarch64
<size
, big_endian
>* got
=
5841 this->got_section(symtab
, layout
);
5842 unsigned int got_offset
= got
->add_constant(0);
5843 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5845 got
->add_constant(0);
5846 this->got_mod_index_offset_
= got_offset
;
5848 return this->got_mod_index_offset_
;
5851 // Optimize the TLS relocation type based on what we know about the
5852 // symbol. IS_FINAL is true if the final address of this symbol is
5853 // known at link time.
5855 template<int size
, bool big_endian
>
5856 tls::Tls_optimization
5857 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5860 // If we are generating a shared library, then we can't do anything
5862 if (parameters
->options().shared())
5863 return tls::TLSOPT_NONE
;
5867 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5868 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5869 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5870 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5871 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5872 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5873 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5874 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5875 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5876 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5877 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5878 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5879 // These are General-Dynamic which permits fully general TLS
5880 // access. Since we know that we are generating an executable,
5881 // we can convert this to Initial-Exec. If we also know that
5882 // this is a local symbol, we can further switch to Local-Exec.
5884 return tls::TLSOPT_TO_LE
;
5885 return tls::TLSOPT_TO_IE
;
5887 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5888 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5889 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5890 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5891 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5892 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5893 // These are Local-Dynamic, which refer to local symbols in the
5894 // dynamic TLS block. Since we know that we generating an
5895 // executable, we can switch to Local-Exec.
5896 return tls::TLSOPT_TO_LE
;
5898 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5899 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5900 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5901 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5902 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5903 // These are Initial-Exec relocs which get the thread offset
5904 // from the GOT. If we know that we are linking against the
5905 // local symbol, we can switch to Local-Exec, which links the
5906 // thread offset into the instruction.
5908 return tls::TLSOPT_TO_LE
;
5909 return tls::TLSOPT_NONE
;
5911 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5912 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5913 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5914 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5915 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5916 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5917 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5918 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5919 // When we already have Local-Exec, there is nothing further we
5921 return tls::TLSOPT_NONE
;
5928 // Returns true if this relocation type could be that of a function pointer.
5930 template<int size
, bool big_endian
>
5932 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5933 unsigned int r_type
)
5937 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5938 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5939 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5940 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5941 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5949 // For safe ICF, scan a relocation for a local symbol to check if it
5950 // corresponds to a function pointer being taken. In that case mark
5951 // the function whose pointer was taken as not foldable.
5953 template<int size
, bool big_endian
>
5955 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5958 Target_aarch64
<size
, big_endian
>* ,
5959 Sized_relobj_file
<size
, big_endian
>* ,
5962 const elfcpp::Rela
<size
, big_endian
>& ,
5963 unsigned int r_type
,
5964 const elfcpp::Sym
<size
, big_endian
>&)
5966 // When building a shared library, do not fold any local symbols.
5967 return (parameters
->options().shared()
5968 || possible_function_pointer_reloc(r_type
));
5971 // For safe ICF, scan a relocation for a global symbol to check if it
5972 // corresponds to a function pointer being taken. In that case mark
5973 // the function whose pointer was taken as not foldable.
5975 template<int size
, bool big_endian
>
5977 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5980 Target_aarch64
<size
, big_endian
>* ,
5981 Sized_relobj_file
<size
, big_endian
>* ,
5984 const elfcpp::Rela
<size
, big_endian
>& ,
5985 unsigned int r_type
,
5988 // When building a shared library, do not fold symbols whose visibility
5989 // is hidden, internal or protected.
5990 return ((parameters
->options().shared()
5991 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5992 || gsym
->visibility() == elfcpp::STV_PROTECTED
5993 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5994 || possible_function_pointer_reloc(r_type
));
5997 // Report an unsupported relocation against a local symbol.
5999 template<int size
, bool big_endian
>
6001 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
6002 Sized_relobj_file
<size
, big_endian
>* object
,
6003 unsigned int r_type
)
6005 gold_error(_("%s: unsupported reloc %u against local symbol"),
6006 object
->name().c_str(), r_type
);
6009 // We are about to emit a dynamic relocation of type R_TYPE. If the
6010 // dynamic linker does not support it, issue an error.
6012 template<int size
, bool big_endian
>
6014 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
6015 unsigned int r_type
)
6017 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
6021 // These are the relocation types supported by glibc for AARCH64.
6022 case elfcpp::R_AARCH64_NONE
:
6023 case elfcpp::R_AARCH64_COPY
:
6024 case elfcpp::R_AARCH64_GLOB_DAT
:
6025 case elfcpp::R_AARCH64_JUMP_SLOT
:
6026 case elfcpp::R_AARCH64_RELATIVE
:
6027 case elfcpp::R_AARCH64_TLS_DTPREL64
:
6028 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
6029 case elfcpp::R_AARCH64_TLS_TPREL64
:
6030 case elfcpp::R_AARCH64_TLSDESC
:
6031 case elfcpp::R_AARCH64_IRELATIVE
:
6032 case elfcpp::R_AARCH64_ABS32
:
6033 case elfcpp::R_AARCH64_ABS64
:
6040 // This prevents us from issuing more than one error per reloc
6041 // section. But we can still wind up issuing more than one
6042 // error per object file.
6043 if (this->issued_non_pic_error_
)
6045 gold_assert(parameters
->options().output_is_position_independent());
6046 object
->error(_("requires unsupported dynamic reloc; "
6047 "recompile with -fPIC"));
6048 this->issued_non_pic_error_
= true;
6052 // Return whether we need to make a PLT entry for a relocation of the
6053 // given type against a STT_GNU_IFUNC symbol.
6055 template<int size
, bool big_endian
>
6057 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
6058 Sized_relobj_file
<size
, big_endian
>* object
,
6059 unsigned int r_type
)
6061 const AArch64_reloc_property
* arp
=
6062 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6063 gold_assert(arp
!= NULL
);
6065 int flags
= arp
->reference_flags();
6066 if (flags
& Symbol::TLS_REF
)
6068 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
6069 object
->name().c_str(), arp
->name().c_str());
6075 // Scan a relocation for a local symbol.
6077 template<int size
, bool big_endian
>
6079 Target_aarch64
<size
, big_endian
>::Scan::local(
6080 Symbol_table
* symtab
,
6082 Target_aarch64
<size
, big_endian
>* target
,
6083 Sized_relobj_file
<size
, big_endian
>* object
,
6084 unsigned int data_shndx
,
6085 Output_section
* output_section
,
6086 const elfcpp::Rela
<size
, big_endian
>& rela
,
6087 unsigned int r_type
,
6088 const elfcpp::Sym
<size
, big_endian
>& lsym
,
6094 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6096 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6098 // A local STT_GNU_IFUNC symbol may require a PLT entry.
6099 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
6100 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
6101 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
6105 case elfcpp::R_AARCH64_NONE
:
6108 case elfcpp::R_AARCH64_ABS32
:
6109 case elfcpp::R_AARCH64_ABS16
:
6110 if (parameters
->options().output_is_position_independent())
6112 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6113 object
->name().c_str(), r_type
);
6117 case elfcpp::R_AARCH64_ABS64
:
6118 // If building a shared library or pie, we need to mark this as a dynmic
6119 // reloction, so that the dynamic loader can relocate it.
6120 if (parameters
->options().output_is_position_independent())
6122 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6123 rela_dyn
->add_local_relative(object
, r_sym
,
6124 elfcpp::R_AARCH64_RELATIVE
,
6127 rela
.get_r_offset(),
6128 rela
.get_r_addend(),
6133 case elfcpp::R_AARCH64_PREL64
:
6134 case elfcpp::R_AARCH64_PREL32
:
6135 case elfcpp::R_AARCH64_PREL16
:
6138 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6139 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6140 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6141 // The above relocations are used to access GOT entries.
6143 Output_data_got_aarch64
<size
, big_endian
>* got
=
6144 target
->got_section(symtab
, layout
);
6145 bool is_new
= false;
6146 // This symbol requires a GOT entry.
6148 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
6150 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
6151 if (is_new
&& parameters
->options().output_is_position_independent())
6152 target
->rela_dyn_section(layout
)->
6153 add_local_relative(object
,
6155 elfcpp::R_AARCH64_RELATIVE
,
6157 object
->local_got_offset(r_sym
,
6164 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6165 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6166 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6167 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6168 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6169 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6170 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6171 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6172 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6173 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6174 if (parameters
->options().output_is_position_independent())
6176 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6177 object
->name().c_str(), r_type
);
6181 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6182 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6183 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6184 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6185 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6186 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6187 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6188 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6189 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6190 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6193 // Control flow, pc-relative. We don't need to do anything for a relative
6194 // addressing relocation against a local symbol if it does not reference
6196 case elfcpp::R_AARCH64_TSTBR14
:
6197 case elfcpp::R_AARCH64_CONDBR19
:
6198 case elfcpp::R_AARCH64_JUMP26
:
6199 case elfcpp::R_AARCH64_CALL26
:
6202 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6203 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6205 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6206 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6207 if (tlsopt
== tls::TLSOPT_TO_LE
)
6210 layout
->set_has_static_tls();
6211 // Create a GOT entry for the tp-relative offset.
6212 if (!parameters
->doing_static_link())
6214 Output_data_got_aarch64
<size
, big_endian
>* got
=
6215 target
->got_section(symtab
, layout
);
6216 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
6217 target
->rela_dyn_section(layout
),
6218 elfcpp::R_AARCH64_TLS_TPREL64
);
6220 else if (!object
->local_has_got_offset(r_sym
,
6221 GOT_TYPE_TLS_OFFSET
))
6223 Output_data_got_aarch64
<size
, big_endian
>* got
=
6224 target
->got_section(symtab
, layout
);
6225 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
6226 unsigned int got_offset
=
6227 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
6228 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6229 gold_assert(addend
== 0);
6230 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
6236 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6237 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6239 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6240 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6241 if (tlsopt
== tls::TLSOPT_TO_LE
)
6243 layout
->set_has_static_tls();
6246 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6248 Output_data_got_aarch64
<size
, big_endian
>* got
=
6249 target
->got_section(symtab
, layout
);
6250 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
6252 target
->rela_dyn_section(layout
),
6253 elfcpp::R_AARCH64_TLS_DTPMOD64
);
6257 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6258 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6259 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6260 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6261 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6262 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6263 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6264 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6266 layout
->set_has_static_tls();
6267 bool output_is_shared
= parameters
->options().shared();
6268 if (output_is_shared
)
6269 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6270 object
->name().c_str(), r_type
);
6274 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6275 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6277 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6278 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6279 if (tlsopt
== tls::TLSOPT_NONE
)
6281 // Create a GOT entry for the module index.
6282 target
->got_mod_index_entry(symtab
, layout
, object
);
6284 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6285 unsupported_reloc_local(object
, r_type
);
6289 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6290 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6291 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6292 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6295 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6296 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6297 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6299 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6300 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6301 target
->define_tls_base_symbol(symtab
, layout
);
6302 if (tlsopt
== tls::TLSOPT_NONE
)
6304 // Create reserved PLT and GOT entries for the resolver.
6305 target
->reserve_tlsdesc_entries(symtab
, layout
);
6307 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6308 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6309 // entry needs to be in an area in .got.plt, not .got. Call
6310 // got_section to make sure the section has been created.
6311 target
->got_section(symtab
, layout
);
6312 Output_data_got
<size
, big_endian
>* got
=
6313 target
->got_tlsdesc_section();
6314 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6315 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
6317 unsigned int got_offset
= got
->add_constant(0);
6318 got
->add_constant(0);
6319 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
6321 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6322 // We store the arguments we need in a vector, and use
6323 // the index into the vector as the parameter to pass
6324 // to the target specific routines.
6325 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6326 void* arg
= reinterpret_cast<void*>(intarg
);
6327 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6328 got
, got_offset
, 0);
6331 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6332 unsupported_reloc_local(object
, r_type
);
6336 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6340 unsupported_reloc_local(object
, r_type
);
6345 // Report an unsupported relocation against a global symbol.
6347 template<int size
, bool big_endian
>
6349 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6350 Sized_relobj_file
<size
, big_endian
>* object
,
6351 unsigned int r_type
,
6354 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6355 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6358 template<int size
, bool big_endian
>
6360 Target_aarch64
<size
, big_endian
>::Scan::global(
6361 Symbol_table
* symtab
,
6363 Target_aarch64
<size
, big_endian
>* target
,
6364 Sized_relobj_file
<size
, big_endian
> * object
,
6365 unsigned int data_shndx
,
6366 Output_section
* output_section
,
6367 const elfcpp::Rela
<size
, big_endian
>& rela
,
6368 unsigned int r_type
,
6371 // A STT_GNU_IFUNC symbol may require a PLT entry.
6372 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6373 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6374 target
->make_plt_entry(symtab
, layout
, gsym
);
6376 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6378 const AArch64_reloc_property
* arp
=
6379 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6380 gold_assert(arp
!= NULL
);
6384 case elfcpp::R_AARCH64_NONE
:
6387 case elfcpp::R_AARCH64_ABS16
:
6388 case elfcpp::R_AARCH64_ABS32
:
6389 case elfcpp::R_AARCH64_ABS64
:
6391 // Make a PLT entry if necessary.
6392 if (gsym
->needs_plt_entry())
6394 target
->make_plt_entry(symtab
, layout
, gsym
);
6395 // Since this is not a PC-relative relocation, we may be
6396 // taking the address of a function. In that case we need to
6397 // set the entry in the dynamic symbol table to the address of
6399 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6400 gsym
->set_needs_dynsym_value();
6402 // Make a dynamic relocation if necessary.
6403 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6405 if (!parameters
->options().output_is_position_independent()
6406 && gsym
->may_need_copy_reloc())
6408 target
->copy_reloc(symtab
, layout
, object
,
6409 data_shndx
, output_section
, gsym
, rela
);
6411 else if (r_type
== elfcpp::R_AARCH64_ABS64
6412 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6413 && gsym
->can_use_relative_reloc(false)
6414 && !gsym
->is_from_dynobj()
6415 && !gsym
->is_undefined()
6416 && !gsym
->is_preemptible())
6418 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6419 // symbol. This makes a function address in a PIE executable
6420 // match the address in a shared library that it links against.
6421 Reloc_section
* rela_dyn
=
6422 target
->rela_irelative_section(layout
);
6423 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6424 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6425 output_section
, object
,
6427 rela
.get_r_offset(),
6428 rela
.get_r_addend());
6430 else if (r_type
== elfcpp::R_AARCH64_ABS64
6431 && gsym
->can_use_relative_reloc(false))
6433 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6434 rela_dyn
->add_global_relative(gsym
,
6435 elfcpp::R_AARCH64_RELATIVE
,
6439 rela
.get_r_offset(),
6440 rela
.get_r_addend(),
6445 check_non_pic(object
, r_type
);
6446 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6447 rela_dyn
= target
->rela_dyn_section(layout
);
6448 rela_dyn
->add_global(
6449 gsym
, r_type
, output_section
, object
,
6450 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6456 case elfcpp::R_AARCH64_PREL16
:
6457 case elfcpp::R_AARCH64_PREL32
:
6458 case elfcpp::R_AARCH64_PREL64
:
6459 // This is used to fill the GOT absolute address.
6460 if (gsym
->needs_plt_entry())
6462 target
->make_plt_entry(symtab
, layout
, gsym
);
6466 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6467 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6468 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6469 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6470 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6471 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6472 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6473 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6474 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6475 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6476 if (parameters
->options().output_is_position_independent())
6478 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6479 object
->name().c_str(), r_type
);
6483 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6484 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6485 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6486 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6487 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6488 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6489 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6490 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6491 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6492 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6494 if (gsym
->needs_plt_entry())
6495 target
->make_plt_entry(symtab
, layout
, gsym
);
6496 // Make a dynamic relocation if necessary.
6497 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6499 if (parameters
->options().output_is_executable()
6500 && gsym
->may_need_copy_reloc())
6502 target
->copy_reloc(symtab
, layout
, object
,
6503 data_shndx
, output_section
, gsym
, rela
);
6509 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6510 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6511 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6513 // The above relocations are used to access GOT entries.
6514 // Note a GOT entry is an *address* to a symbol.
6515 // The symbol requires a GOT entry
6516 Output_data_got_aarch64
<size
, big_endian
>* got
=
6517 target
->got_section(symtab
, layout
);
6518 if (gsym
->final_value_is_known())
6520 // For a STT_GNU_IFUNC symbol we want the PLT address.
6521 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6522 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6524 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6528 // If this symbol is not fully resolved, we need to add a dynamic
6529 // relocation for it.
6530 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6532 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6534 // 1) The symbol may be defined in some other module.
6535 // 2) We are building a shared library and this is a protected
6536 // symbol; using GLOB_DAT means that the dynamic linker can use
6537 // the address of the PLT in the main executable when appropriate
6538 // so that function address comparisons work.
6539 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6540 // again so that function address comparisons work.
6541 if (gsym
->is_from_dynobj()
6542 || gsym
->is_undefined()
6543 || gsym
->is_preemptible()
6544 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6545 && parameters
->options().shared())
6546 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6547 && parameters
->options().output_is_position_independent()))
6548 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6549 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6552 // For a STT_GNU_IFUNC symbol we want to write the PLT
6553 // offset into the GOT, so that function pointer
6554 // comparisons work correctly.
6556 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6557 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6560 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6561 // Tell the dynamic linker to use the PLT address
6562 // when resolving relocations.
6563 if (gsym
->is_from_dynobj()
6564 && !parameters
->options().shared())
6565 gsym
->set_needs_dynsym_value();
6569 rela_dyn
->add_global_relative(
6570 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6572 gsym
->got_offset(GOT_TYPE_STANDARD
),
6581 case elfcpp::R_AARCH64_TSTBR14
:
6582 case elfcpp::R_AARCH64_CONDBR19
:
6583 case elfcpp::R_AARCH64_JUMP26
:
6584 case elfcpp::R_AARCH64_CALL26
:
6586 if (gsym
->final_value_is_known())
6589 if (gsym
->is_defined() &&
6590 !gsym
->is_from_dynobj() &&
6591 !gsym
->is_preemptible())
6594 // Make plt entry for function call.
6595 target
->make_plt_entry(symtab
, layout
, gsym
);
6599 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6600 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6602 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6603 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6604 if (tlsopt
== tls::TLSOPT_TO_LE
)
6606 layout
->set_has_static_tls();
6609 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6612 Output_data_got_aarch64
<size
, big_endian
>* got
=
6613 target
->got_section(symtab
, layout
);
6614 // Create 2 consecutive entries for module index and offset.
6615 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6616 target
->rela_dyn_section(layout
),
6617 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6618 elfcpp::R_AARCH64_TLS_DTPREL64
);
6622 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6623 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6625 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6626 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6627 if (tlsopt
== tls::TLSOPT_NONE
)
6629 // Create a GOT entry for the module index.
6630 target
->got_mod_index_entry(symtab
, layout
, object
);
6632 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6633 unsupported_reloc_local(object
, r_type
);
6637 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6638 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6639 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6640 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6643 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6644 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6646 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6647 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6648 if (tlsopt
== tls::TLSOPT_TO_LE
)
6651 layout
->set_has_static_tls();
6652 // Create a GOT entry for the tp-relative offset.
6653 Output_data_got_aarch64
<size
, big_endian
>* got
6654 = target
->got_section(symtab
, layout
);
6655 if (!parameters
->doing_static_link())
6657 got
->add_global_with_rel(
6658 gsym
, GOT_TYPE_TLS_OFFSET
,
6659 target
->rela_dyn_section(layout
),
6660 elfcpp::R_AARCH64_TLS_TPREL64
);
6662 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6664 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6665 unsigned int got_offset
=
6666 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6667 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6668 gold_assert(addend
== 0);
6669 got
->add_static_reloc(got_offset
,
6670 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6675 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6676 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6677 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6678 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6679 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6680 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6681 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6682 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6683 layout
->set_has_static_tls();
6684 if (parameters
->options().shared())
6685 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6686 object
->name().c_str(), r_type
);
6689 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6690 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6691 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6693 target
->define_tls_base_symbol(symtab
, layout
);
6694 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6695 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6696 if (tlsopt
== tls::TLSOPT_NONE
)
6698 // Create reserved PLT and GOT entries for the resolver.
6699 target
->reserve_tlsdesc_entries(symtab
, layout
);
6701 // Create a double GOT entry with an R_AARCH64_TLSDESC
6702 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6703 // entry needs to be in an area in .got.plt, not .got. Call
6704 // got_section to make sure the section has been created.
6705 target
->got_section(symtab
, layout
);
6706 Output_data_got
<size
, big_endian
>* got
=
6707 target
->got_tlsdesc_section();
6708 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6709 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6710 elfcpp::R_AARCH64_TLSDESC
, 0);
6712 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6714 // Create a GOT entry for the tp-relative offset.
6715 Output_data_got
<size
, big_endian
>* got
6716 = target
->got_section(symtab
, layout
);
6717 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6718 target
->rela_dyn_section(layout
),
6719 elfcpp::R_AARCH64_TLS_TPREL64
);
6721 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6722 unsupported_reloc_global(object
, r_type
, gsym
);
6726 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6730 gold_error(_("%s: unsupported reloc type in global scan"),
6731 aarch64_reloc_property_table
->
6732 reloc_name_in_error_message(r_type
).c_str());
6735 } // End of Scan::global
6738 // Create the PLT section.
6739 template<int size
, bool big_endian
>
6741 Target_aarch64
<size
, big_endian
>::make_plt_section(
6742 Symbol_table
* symtab
, Layout
* layout
)
6744 if (this->plt_
== NULL
)
6746 // Create the GOT section first.
6747 this->got_section(symtab
, layout
);
6749 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6750 this->got_irelative_
);
6752 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6754 | elfcpp::SHF_EXECINSTR
),
6755 this->plt_
, ORDER_PLT
, false);
6757 // Make the sh_info field of .rela.plt point to .plt.
6758 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6759 rela_plt_os
->set_info_section(this->plt_
->output_section());
6763 // Return the section for TLSDESC relocations.
6765 template<int size
, bool big_endian
>
6766 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6767 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6769 return this->plt_section()->rela_tlsdesc(layout
);
6772 // Create a PLT entry for a global symbol.
6774 template<int size
, bool big_endian
>
6776 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6777 Symbol_table
* symtab
,
6781 if (gsym
->has_plt_offset())
6784 if (this->plt_
== NULL
)
6785 this->make_plt_section(symtab
, layout
);
6787 this->plt_
->add_entry(symtab
, layout
, gsym
);
6790 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6792 template<int size
, bool big_endian
>
6794 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6795 Symbol_table
* symtab
, Layout
* layout
,
6796 Sized_relobj_file
<size
, big_endian
>* relobj
,
6797 unsigned int local_sym_index
)
6799 if (relobj
->local_has_plt_offset(local_sym_index
))
6801 if (this->plt_
== NULL
)
6802 this->make_plt_section(symtab
, layout
);
6803 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6806 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6809 template<int size
, bool big_endian
>
6811 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6812 Symbol_table
* symtab
,
6814 Sized_relobj_file
<size
, big_endian
>* object
,
6815 unsigned int data_shndx
,
6816 unsigned int sh_type
,
6817 const unsigned char* prelocs
,
6819 Output_section
* output_section
,
6820 bool needs_special_offset_handling
,
6821 size_t local_symbol_count
,
6822 const unsigned char* plocal_symbols
)
6824 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6825 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6828 if (sh_type
== elfcpp::SHT_REL
)
6833 gold::gc_process_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6842 needs_special_offset_handling
,
6847 // Scan relocations for a section.
6849 template<int size
, bool big_endian
>
6851 Target_aarch64
<size
, big_endian
>::scan_relocs(
6852 Symbol_table
* symtab
,
6854 Sized_relobj_file
<size
, big_endian
>* object
,
6855 unsigned int data_shndx
,
6856 unsigned int sh_type
,
6857 const unsigned char* prelocs
,
6859 Output_section
* output_section
,
6860 bool needs_special_offset_handling
,
6861 size_t local_symbol_count
,
6862 const unsigned char* plocal_symbols
)
6864 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6865 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6868 if (sh_type
== elfcpp::SHT_REL
)
6870 gold_error(_("%s: unsupported REL reloc section"),
6871 object
->name().c_str());
6875 gold::scan_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6884 needs_special_offset_handling
,
6889 // Return the value to use for a dynamic which requires special
6890 // treatment. This is how we support equality comparisons of function
6891 // pointers across shared library boundaries, as described in the
6892 // processor specific ABI supplement.
6894 template<int size
, bool big_endian
>
6896 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6898 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6899 return this->plt_address_for_global(gsym
);
6903 // Finalize the sections.
6905 template<int size
, bool big_endian
>
6907 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6909 const Input_objects
*,
6910 Symbol_table
* symtab
)
6912 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6914 : this->plt_
->rela_plt());
6915 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6916 this->rela_dyn_
, true, false);
6918 // Emit any relocs we saved in an attempt to avoid generating COPY
6920 if (this->copy_relocs_
.any_saved_relocs())
6921 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6923 // Fill in some more dynamic tags.
6924 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6927 if (this->plt_
!= NULL
6928 && this->plt_
->output_section() != NULL
6929 && this->plt_
->has_tlsdesc_entry())
6931 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6932 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6933 this->got_
->finalize_data_size();
6934 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6935 this->plt_
, plt_offset
);
6936 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6937 this->got_
, got_offset
);
6941 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6942 // the .got.plt section.
6943 Symbol
* sym
= this->global_offset_table_
;
6946 uint64_t data_size
= this->got_plt_
->current_data_size();
6947 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6949 // If the .got section is more than 0x8000 bytes, we add
6950 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6951 // bit relocations have a greater chance of working.
6952 if (data_size
>= 0x8000)
6953 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6954 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6957 if (parameters
->doing_static_link()
6958 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6960 // If linking statically, make sure that the __rela_iplt symbols
6961 // were defined if necessary, even if we didn't create a PLT.
6962 static const Define_symbol_in_segment syms
[] =
6965 "__rela_iplt_start", // name
6966 elfcpp::PT_LOAD
, // segment_type
6967 elfcpp::PF_W
, // segment_flags_set
6968 elfcpp::PF(0), // segment_flags_clear
6971 elfcpp::STT_NOTYPE
, // type
6972 elfcpp::STB_GLOBAL
, // binding
6973 elfcpp::STV_HIDDEN
, // visibility
6975 Symbol::SEGMENT_START
, // offset_from_base
6979 "__rela_iplt_end", // name
6980 elfcpp::PT_LOAD
, // segment_type
6981 elfcpp::PF_W
, // segment_flags_set
6982 elfcpp::PF(0), // segment_flags_clear
6985 elfcpp::STT_NOTYPE
, // type
6986 elfcpp::STB_GLOBAL
, // binding
6987 elfcpp::STV_HIDDEN
, // visibility
6989 Symbol::SEGMENT_START
, // offset_from_base
6994 symtab
->define_symbols(layout
, 2, syms
,
6995 layout
->script_options()->saw_sections_clause());
7001 // Perform a relocation.
7003 template<int size
, bool big_endian
>
7005 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
7006 const Relocate_info
<size
, big_endian
>* relinfo
,
7008 Target_aarch64
<size
, big_endian
>* target
,
7011 const unsigned char* preloc
,
7012 const Sized_symbol
<size
>* gsym
,
7013 const Symbol_value
<size
>* psymval
,
7014 unsigned char* view
,
7015 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
7016 section_size_type
/* view_size */)
7021 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
7023 const elfcpp::Rela
<size
, big_endian
> rela(preloc
);
7024 unsigned int r_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
7025 const AArch64_reloc_property
* reloc_property
=
7026 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7028 if (reloc_property
== NULL
)
7030 std::string reloc_name
=
7031 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
7032 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7033 _("cannot relocate %s in object file"),
7034 reloc_name
.c_str());
7038 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7040 // Pick the value to use for symbols defined in the PLT.
7041 Symbol_value
<size
> symval
;
7043 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
7045 symval
.set_output_value(target
->plt_address_for_global(gsym
));
7048 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
7050 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7051 if (object
->local_has_plt_offset(r_sym
))
7053 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
7058 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7060 // Get the GOT offset if needed.
7061 // For aarch64, the GOT pointer points to the start of the GOT section.
7062 bool have_got_offset
= false;
7064 int got_base
= (target
->got_
!= NULL
7065 ? (target
->got_
->current_data_size() >= 0x8000
7070 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
7071 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
7072 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
7073 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
7074 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
7075 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
7076 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
7077 case elfcpp::R_AARCH64_GOTREL64
:
7078 case elfcpp::R_AARCH64_GOTREL32
:
7079 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
7080 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
7081 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7082 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7083 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7086 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
7087 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
7091 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7092 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
7093 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
7096 have_got_offset
= true;
7103 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
7104 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
7107 case elfcpp::R_AARCH64_NONE
:
7110 case elfcpp::R_AARCH64_ABS64
:
7111 if (!parameters
->options().apply_dynamic_relocs()
7112 && parameters
->options().output_is_position_independent()
7114 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags())
7115 && !gsym
->can_use_relative_reloc(false))
7116 // We have generated an absolute dynamic relocation, so do not
7117 // apply the relocation statically. (Works around bugs in older
7118 // Android dynamic linkers.)
7120 reloc_status
= Reloc::template rela_ua
<64>(
7121 view
, object
, psymval
, addend
, reloc_property
);
7124 case elfcpp::R_AARCH64_ABS32
:
7125 if (!parameters
->options().apply_dynamic_relocs()
7126 && parameters
->options().output_is_position_independent()
7128 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7129 // We have generated an absolute dynamic relocation, so do not
7130 // apply the relocation statically. (Works around bugs in older
7131 // Android dynamic linkers.)
7133 reloc_status
= Reloc::template rela_ua
<32>(
7134 view
, object
, psymval
, addend
, reloc_property
);
7137 case elfcpp::R_AARCH64_ABS16
:
7138 if (!parameters
->options().apply_dynamic_relocs()
7139 && parameters
->options().output_is_position_independent()
7141 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7142 // We have generated an absolute dynamic relocation, so do not
7143 // apply the relocation statically. (Works around bugs in older
7144 // Android dynamic linkers.)
7146 reloc_status
= Reloc::template rela_ua
<16>(
7147 view
, object
, psymval
, addend
, reloc_property
);
7150 case elfcpp::R_AARCH64_PREL64
:
7151 reloc_status
= Reloc::template pcrela_ua
<64>(
7152 view
, object
, psymval
, addend
, address
, reloc_property
);
7155 case elfcpp::R_AARCH64_PREL32
:
7156 reloc_status
= Reloc::template pcrela_ua
<32>(
7157 view
, object
, psymval
, addend
, address
, reloc_property
);
7160 case elfcpp::R_AARCH64_PREL16
:
7161 reloc_status
= Reloc::template pcrela_ua
<16>(
7162 view
, object
, psymval
, addend
, address
, reloc_property
);
7165 case elfcpp::R_AARCH64_MOVW_UABS_G0
:
7166 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
:
7167 case elfcpp::R_AARCH64_MOVW_UABS_G1
:
7168 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
:
7169 case elfcpp::R_AARCH64_MOVW_UABS_G2
:
7170 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
:
7171 case elfcpp::R_AARCH64_MOVW_UABS_G3
:
7172 reloc_status
= Reloc::template rela_general
<32>(
7173 view
, object
, psymval
, addend
, reloc_property
);
7175 case elfcpp::R_AARCH64_MOVW_SABS_G0
:
7176 case elfcpp::R_AARCH64_MOVW_SABS_G1
:
7177 case elfcpp::R_AARCH64_MOVW_SABS_G2
:
7178 reloc_status
= Reloc::movnz(view
, psymval
->value(object
, addend
),
7182 case elfcpp::R_AARCH64_LD_PREL_LO19
:
7183 reloc_status
= Reloc::template pcrela_general
<32>(
7184 view
, object
, psymval
, addend
, address
, reloc_property
);
7187 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
7188 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
7189 address
, reloc_property
);
7192 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
7193 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
7194 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
7198 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
7199 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
7200 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
7201 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
7202 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
7203 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
7204 reloc_status
= Reloc::template rela_general
<32>(
7205 view
, object
, psymval
, addend
, reloc_property
);
7208 case elfcpp::R_AARCH64_CALL26
:
7209 if (this->skip_call_tls_get_addr_
)
7211 // Double check that the TLSGD insn has been optimized away.
7212 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7213 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
7214 reinterpret_cast<Insntype
*>(view
));
7215 gold_assert((insn
& 0xff000000) == 0x91000000);
7217 reloc_status
= Reloc::STATUS_OKAY
;
7218 this->skip_call_tls_get_addr_
= false;
7219 // Return false to stop further processing this reloc.
7223 case elfcpp::R_AARCH64_JUMP26
:
7224 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
7225 gsym
, psymval
, object
,
7226 target
->stub_group_size_
))
7229 case elfcpp::R_AARCH64_TSTBR14
:
7230 case elfcpp::R_AARCH64_CONDBR19
:
7231 reloc_status
= Reloc::template pcrela_general
<32>(
7232 view
, object
, psymval
, addend
, address
, reloc_property
);
7235 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7236 gold_assert(have_got_offset
);
7237 value
= target
->got_
->address() + got_base
+ got_offset
;
7238 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
7241 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7242 gold_assert(have_got_offset
);
7243 value
= target
->got_
->address() + got_base
+ got_offset
;
7244 reloc_status
= Reloc::template rela_general
<32>(
7245 view
, value
, addend
, reloc_property
);
7248 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7250 gold_assert(have_got_offset
);
7251 value
= target
->got_
->address() + got_base
+ got_offset
+ addend
-
7252 Reloc::Page(target
->got_
->address() + got_base
);
7253 if ((value
& 7) != 0)
7254 reloc_status
= Reloc::STATUS_OVERFLOW
;
7256 reloc_status
= Reloc::template reloc_common
<32>(
7257 view
, value
, reloc_property
);
7261 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7262 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7263 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7264 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7265 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7266 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7267 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7268 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7269 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7270 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7271 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7272 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7273 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7274 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7275 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7276 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7277 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7278 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7279 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7280 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7281 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7282 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7283 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
7284 gsym
, psymval
, view
, address
);
7287 // These are dynamic relocations, which are unexpected when linking.
7288 case elfcpp::R_AARCH64_COPY
:
7289 case elfcpp::R_AARCH64_GLOB_DAT
:
7290 case elfcpp::R_AARCH64_JUMP_SLOT
:
7291 case elfcpp::R_AARCH64_RELATIVE
:
7292 case elfcpp::R_AARCH64_IRELATIVE
:
7293 case elfcpp::R_AARCH64_TLS_DTPREL64
:
7294 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
7295 case elfcpp::R_AARCH64_TLS_TPREL64
:
7296 case elfcpp::R_AARCH64_TLSDESC
:
7297 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7298 _("unexpected reloc %u in object file"),
7303 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7304 _("unsupported reloc %s"),
7305 reloc_property
->name().c_str());
7309 // Report any errors.
7310 switch (reloc_status
)
7312 case Reloc::STATUS_OKAY
:
7314 case Reloc::STATUS_OVERFLOW
:
7315 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7316 _("relocation overflow in %s"),
7317 reloc_property
->name().c_str());
7319 case Reloc::STATUS_BAD_RELOC
:
7320 gold_error_at_location(
7323 rela
.get_r_offset(),
7324 _("unexpected opcode while processing relocation %s"),
7325 reloc_property
->name().c_str());
7335 template<int size
, bool big_endian
>
7337 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7338 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
7339 const Relocate_info
<size
, big_endian
>* relinfo
,
7340 Target_aarch64
<size
, big_endian
>* target
,
7342 const elfcpp::Rela
<size
, big_endian
>& rela
,
7343 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
7344 const Symbol_value
<size
>* psymval
,
7345 unsigned char* view
,
7346 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7348 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7349 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7351 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7352 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7353 const AArch64_reloc_property
* reloc_property
=
7354 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7355 gold_assert(reloc_property
!= NULL
);
7357 const bool is_final
= (gsym
== NULL
7358 ? !parameters
->options().shared()
7359 : gsym
->final_value_is_known());
7360 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
7361 optimize_tls_reloc(is_final
, r_type
);
7363 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7364 int tls_got_offset_type
;
7367 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7368 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
7370 if (tlsopt
== tls::TLSOPT_TO_LE
)
7372 if (tls_segment
== NULL
)
7374 gold_assert(parameters
->errors()->error_count() > 0
7375 || issue_undefined_symbol_error(gsym
));
7376 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7378 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
7381 else if (tlsopt
== tls::TLSOPT_NONE
)
7383 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
7384 // Firstly get the address for the got entry.
7385 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7388 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7389 got_entry_address
= target
->got_
->address() +
7390 gsym
->got_offset(tls_got_offset_type
);
7394 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7396 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7397 got_entry_address
= target
->got_
->address() +
7398 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7401 // Relocate the address into adrp/ld, adrp/add pair.
7404 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7405 return aarch64_reloc_funcs::adrp(
7406 view
, got_entry_address
+ addend
, address
);
7410 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7411 return aarch64_reloc_funcs::template rela_general
<32>(
7412 view
, got_entry_address
, addend
, reloc_property
);
7419 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7420 _("unsupported gd_to_ie relaxation on %u"),
7425 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7426 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7428 if (tlsopt
== tls::TLSOPT_TO_LE
)
7430 if (tls_segment
== NULL
)
7432 gold_assert(parameters
->errors()->error_count() > 0
7433 || issue_undefined_symbol_error(gsym
));
7434 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7436 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7440 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7441 // Relocate the field with the offset of the GOT entry for
7442 // the module index.
7443 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7444 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7445 target
->got_
->address());
7449 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7450 return aarch64_reloc_funcs::adrp(
7451 view
, got_entry_address
+ addend
, address
);
7454 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7455 return aarch64_reloc_funcs::template rela_general
<32>(
7456 view
, got_entry_address
, addend
, reloc_property
);
7465 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7466 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7467 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7468 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7470 AArch64_address value
= psymval
->value(object
, 0);
7471 if (tlsopt
== tls::TLSOPT_TO_LE
)
7473 if (tls_segment
== NULL
)
7475 gold_assert(parameters
->errors()->error_count() > 0
7476 || issue_undefined_symbol_error(gsym
));
7477 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7482 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7483 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7487 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7488 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7489 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7490 return aarch64_reloc_funcs::template rela_general
<32>(
7491 view
, value
, addend
, reloc_property
);
7497 // We should never reach here.
7501 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7502 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7504 if (tlsopt
== tls::TLSOPT_TO_LE
)
7506 if (tls_segment
== NULL
)
7508 gold_assert(parameters
->errors()->error_count() > 0
7509 || issue_undefined_symbol_error(gsym
));
7510 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7512 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7515 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7517 // Firstly get the address for the got entry.
7518 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7521 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7522 got_entry_address
= target
->got_
->address() +
7523 gsym
->got_offset(tls_got_offset_type
);
7527 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7529 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7530 got_entry_address
= target
->got_
->address() +
7531 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7533 // Relocate the address into adrp/ld, adrp/add pair.
7536 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7537 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7540 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7541 return aarch64_reloc_funcs::template rela_general
<32>(
7542 view
, got_entry_address
, addend
, reloc_property
);
7547 // We shall never reach here.
7550 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7551 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7552 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7553 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7554 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7555 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7556 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7557 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7559 gold_assert(tls_segment
!= NULL
);
7560 AArch64_address value
= psymval
->value(object
, 0);
7562 if (!parameters
->options().shared())
7564 AArch64_address aligned_tcb_size
=
7565 align_address(target
->tcb_size(),
7566 tls_segment
->maximum_alignment());
7567 value
+= aligned_tcb_size
;
7570 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7571 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7572 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7573 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7576 return aarch64_reloc_funcs::template
7577 rela_general
<32>(view
,
7584 gold_error(_("%s: unsupported reloc %u "
7585 "in non-static TLSLE mode."),
7586 object
->name().c_str(), r_type
);
7590 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7591 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7592 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7593 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7595 if (tlsopt
== tls::TLSOPT_TO_LE
)
7597 if (tls_segment
== NULL
)
7599 gold_assert(parameters
->errors()->error_count() > 0
7600 || issue_undefined_symbol_error(gsym
));
7601 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7603 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7608 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7609 ? GOT_TYPE_TLS_OFFSET
7610 : GOT_TYPE_TLS_DESC
);
7611 int got_tlsdesc_offset
= 0;
7612 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7613 && tlsopt
== tls::TLSOPT_NONE
)
7615 // We created GOT entries in the .got.tlsdesc portion of the
7616 // .got.plt section, but the offset stored in the symbol is the
7617 // offset within .got.tlsdesc.
7618 got_tlsdesc_offset
= (target
->got_tlsdesc_
->address()
7619 - target
->got_
->address());
7621 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7624 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7625 got_entry_address
= target
->got_
->address()
7626 + got_tlsdesc_offset
7627 + gsym
->got_offset(tls_got_offset_type
);
7631 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7633 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7634 got_entry_address
= target
->got_
->address() +
7635 got_tlsdesc_offset
+
7636 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7638 if (tlsopt
== tls::TLSOPT_TO_IE
)
7640 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7641 view
, psymval
, got_entry_address
,
7645 // Now do tlsdesc relocation.
7648 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7649 return aarch64_reloc_funcs::adrp(view
,
7650 got_entry_address
+ addend
,
7653 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7654 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7655 return aarch64_reloc_funcs::template rela_general
<32>(
7656 view
, got_entry_address
, addend
, reloc_property
);
7658 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7659 return aarch64_reloc_funcs::STATUS_OKAY
;
7669 gold_error(_("%s: unsupported TLS reloc %u."),
7670 object
->name().c_str(), r_type
);
7672 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7673 } // End of relocate_tls.
7676 template<int size
, bool big_endian
>
7678 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7679 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7680 const Relocate_info
<size
, big_endian
>* relinfo
,
7681 Target_aarch64
<size
, big_endian
>* target
,
7682 const elfcpp::Rela
<size
, big_endian
>& rela
,
7683 unsigned int r_type
,
7684 unsigned char* view
,
7685 const Symbol_value
<size
>* psymval
)
7687 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7688 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7689 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7691 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7692 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7693 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7694 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7696 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7698 // This is the 2nd relocs, optimization should already have been
7700 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7701 return aarch64_reloc_funcs::STATUS_OKAY
;
7704 // The original sequence is -
7705 // 90000000 adrp x0, 0 <main>
7706 // 91000000 add x0, x0, #0x0
7707 // 94000000 bl 0 <__tls_get_addr>
7708 // optimized to sequence -
7709 // d53bd040 mrs x0, tpidr_el0
7710 // 91400000 add x0, x0, #0x0, lsl #12
7711 // 91000000 add x0, x0, #0x0
7713 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7714 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7715 // have to change "bl tls_get_addr", which does not have a corresponding tls
7716 // relocation type. So before proceeding, we need to make sure compiler
7717 // does not change the sequence.
7718 if(!(insn1
== 0x90000000 // adrp x0,0
7719 && insn2
== 0x91000000 // add x0, x0, #0x0
7720 && insn3
== 0x94000000)) // bl 0
7722 // Ideally we should give up gd_to_le relaxation and do gd access.
7723 // However the gd_to_le relaxation decision has been made early
7724 // in the scan stage, where we did not allocate any GOT entry for
7725 // this symbol. Therefore we have to exit and report error now.
7726 gold_error(_("unexpected reloc insn sequence while relaxing "
7727 "tls gd to le for reloc %u."), r_type
);
7728 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7732 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7733 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7734 insn3
= 0x91000000; // add x0, x0, #0x0
7735 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7736 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7737 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7739 // Calculate tprel value.
7740 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7741 gold_assert(tls_segment
!= NULL
);
7742 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7743 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7744 AArch64_address aligned_tcb_size
=
7745 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7746 AArch64_address x
= value
+ aligned_tcb_size
;
7748 // After new insns are written, apply TLSLE relocs.
7749 const AArch64_reloc_property
* rp1
=
7750 aarch64_reloc_property_table
->get_reloc_property(
7751 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7752 const AArch64_reloc_property
* rp2
=
7753 aarch64_reloc_property_table
->get_reloc_property(
7754 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7755 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7757 typename
aarch64_reloc_funcs::Status s1
=
7758 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7762 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7765 typename
aarch64_reloc_funcs::Status s2
=
7766 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7771 this->skip_call_tls_get_addr_
= true;
7773 } // End of tls_gd_to_le
7776 template<int size
, bool big_endian
>
7778 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7779 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7780 const Relocate_info
<size
, big_endian
>* relinfo
,
7781 Target_aarch64
<size
, big_endian
>* target
,
7782 const elfcpp::Rela
<size
, big_endian
>& rela
,
7783 unsigned int r_type
,
7784 unsigned char* view
,
7785 const Symbol_value
<size
>* psymval
)
7787 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7788 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7789 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7791 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7792 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7793 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7794 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7796 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7798 // This is the 2nd relocs, optimization should already have been
7800 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7801 return aarch64_reloc_funcs::STATUS_OKAY
;
7804 // The original sequence is -
7805 // 90000000 adrp x0, 0 <main>
7806 // 91000000 add x0, x0, #0x0
7807 // 94000000 bl 0 <__tls_get_addr>
7808 // optimized to sequence -
7809 // d53bd040 mrs x0, tpidr_el0
7810 // 91400000 add x0, x0, #0x0, lsl #12
7811 // 91000000 add x0, x0, #0x0
7813 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7814 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7815 // have to change "bl tls_get_addr", which does not have a corresponding tls
7816 // relocation type. So before proceeding, we need to make sure compiler
7817 // does not change the sequence.
7818 if(!(insn1
== 0x90000000 // adrp x0,0
7819 && insn2
== 0x91000000 // add x0, x0, #0x0
7820 && insn3
== 0x94000000)) // bl 0
7822 // Ideally we should give up gd_to_le relaxation and do gd access.
7823 // However the gd_to_le relaxation decision has been made early
7824 // in the scan stage, where we did not allocate a GOT entry for
7825 // this symbol. Therefore we have to exit and report an error now.
7826 gold_error(_("unexpected reloc insn sequence while relaxing "
7827 "tls gd to le for reloc %u."), r_type
);
7828 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7832 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7833 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7834 insn3
= 0x91000000; // add x0, x0, #0x0
7835 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7836 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7837 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7839 // Calculate tprel value.
7840 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7841 gold_assert(tls_segment
!= NULL
);
7842 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7843 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7844 AArch64_address aligned_tcb_size
=
7845 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7846 AArch64_address x
= value
+ aligned_tcb_size
;
7848 // After new insns are written, apply TLSLE relocs.
7849 const AArch64_reloc_property
* rp1
=
7850 aarch64_reloc_property_table
->get_reloc_property(
7851 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7852 const AArch64_reloc_property
* rp2
=
7853 aarch64_reloc_property_table
->get_reloc_property(
7854 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7855 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7857 typename
aarch64_reloc_funcs::Status s1
=
7858 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7862 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7865 typename
aarch64_reloc_funcs::Status s2
=
7866 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7871 this->skip_call_tls_get_addr_
= true;
7874 } // End of tls_ld_to_le
7876 template<int size
, bool big_endian
>
7878 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7879 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7880 const Relocate_info
<size
, big_endian
>* relinfo
,
7881 Target_aarch64
<size
, big_endian
>* target
,
7882 const elfcpp::Rela
<size
, big_endian
>& rela
,
7883 unsigned int r_type
,
7884 unsigned char* view
,
7885 const Symbol_value
<size
>* psymval
)
7887 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7888 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7889 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7891 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7892 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7893 AArch64_address aligned_tcb_address
=
7894 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7895 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7896 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7897 // "x" is the offset to tp, we can only do this if x is within
7898 // range [0, 2^32-1]
7899 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7901 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7903 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7906 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7907 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7910 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7913 regno
= (insn
& 0x1f);
7914 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7916 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7919 regno
= (insn
& 0x1f);
7920 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7921 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7926 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7927 return aarch64_reloc_funcs::STATUS_OKAY
;
7928 } // End of tls_ie_to_le
7931 template<int size
, bool big_endian
>
7933 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7934 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7935 const Relocate_info
<size
, big_endian
>* relinfo
,
7936 Target_aarch64
<size
, big_endian
>* target
,
7937 const elfcpp::Rela
<size
, big_endian
>& rela
,
7938 unsigned int r_type
,
7939 unsigned char* view
,
7940 const Symbol_value
<size
>* psymval
)
7942 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7943 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7944 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7946 // TLSDESC-GD sequence is like:
7947 // adrp x0, :tlsdesc:v1
7948 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7949 // add x0, x0, :tlsdesc_lo12:v1
7952 // After desc_gd_to_le optimization, the sequence will be like:
7953 // movz x0, #0x0, lsl #16
7958 // Calculate tprel value.
7959 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7960 gold_assert(tls_segment
!= NULL
);
7961 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7962 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7963 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7964 AArch64_address aligned_tcb_size
=
7965 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7966 AArch64_address x
= value
+ aligned_tcb_size
;
7967 // x is the offset to tp, we can only do this if x is within range
7968 // [0, 2^32-1]. If x is out of range, fail and exit.
7969 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7971 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7972 "We Can't do gd_to_le relaxation.\n"), r_type
);
7973 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7978 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7979 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7981 newinsn
= 0xd503201f;
7984 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7986 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7989 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7991 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7995 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7999 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
8000 return aarch64_reloc_funcs::STATUS_OKAY
;
8001 } // End of tls_desc_gd_to_le
8004 template<int size
, bool big_endian
>
8006 typename AArch64_relocate_functions
<size
, big_endian
>::Status
8007 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
8008 const Relocate_info
<size
, big_endian
>* /* relinfo */,
8009 Target_aarch64
<size
, big_endian
>* /* target */,
8010 const elfcpp::Rela
<size
, big_endian
>& rela
,
8011 unsigned int r_type
,
8012 unsigned char* view
,
8013 const Symbol_value
<size
>* /* psymval */,
8014 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
8015 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
8017 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
8018 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
8020 // TLSDESC-GD sequence is like:
8021 // adrp x0, :tlsdesc:v1
8022 // ldr x1, [x0, #:tlsdesc_lo12:v1]
8023 // add x0, x0, :tlsdesc_lo12:v1
8026 // After desc_gd_to_ie optimization, the sequence will be like:
8027 // adrp x0, :tlsie:v1
8028 // ldr x0, [x0, :tlsie_lo12:v1]
8032 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
8033 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
8037 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
8038 case elfcpp::R_AARCH64_TLSDESC_CALL
:
8040 newinsn
= 0xd503201f;
8041 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
8044 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
8046 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
8051 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
8053 // Set ldr target register to be x0.
8054 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
8056 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
8058 const AArch64_reloc_property
* reloc_property
=
8059 aarch64_reloc_property_table
->get_reloc_property(
8060 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
8061 return aarch64_reloc_funcs::template rela_general
<32>(
8062 view
, got_entry_address
, addend
, reloc_property
);
8067 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
8071 return aarch64_reloc_funcs::STATUS_OKAY
;
8072 } // End of tls_desc_gd_to_ie
8074 // Relocate section data.
8076 template<int size
, bool big_endian
>
8078 Target_aarch64
<size
, big_endian
>::relocate_section(
8079 const Relocate_info
<size
, big_endian
>* relinfo
,
8080 unsigned int sh_type
,
8081 const unsigned char* prelocs
,
8083 Output_section
* output_section
,
8084 bool needs_special_offset_handling
,
8085 unsigned char* view
,
8086 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
8087 section_size_type view_size
,
8088 const Reloc_symbol_changes
* reloc_symbol_changes
)
8090 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
8091 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
8092 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
8093 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8096 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8098 // See if we are relocating a relaxed input section. If so, the view
8099 // covers the whole output section and we need to adjust accordingly.
8100 if (needs_special_offset_handling
)
8102 const Output_relaxed_input_section
* poris
=
8103 output_section
->find_relaxed_input_section(relinfo
->object
,
8104 relinfo
->data_shndx
);
8107 Address section_address
= poris
->address();
8108 section_size_type section_size
= poris
->data_size();
8110 gold_assert((section_address
>= address
)
8111 && ((section_address
+ section_size
)
8112 <= (address
+ view_size
)));
8114 off_t offset
= section_address
- address
;
8117 view_size
= section_size
;
8121 gold::relocate_section
<size
, big_endian
, Aarch64
, AArch64_relocate
,
8122 gold::Default_comdat_behavior
, Classify_reloc
>(
8128 needs_special_offset_handling
,
8132 reloc_symbol_changes
);
8135 // Scan the relocs during a relocatable link.
8137 template<int size
, bool big_endian
>
8139 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
8140 Symbol_table
* symtab
,
8142 Sized_relobj_file
<size
, big_endian
>* object
,
8143 unsigned int data_shndx
,
8144 unsigned int sh_type
,
8145 const unsigned char* prelocs
,
8147 Output_section
* output_section
,
8148 bool needs_special_offset_handling
,
8149 size_t local_symbol_count
,
8150 const unsigned char* plocal_symbols
,
8151 Relocatable_relocs
* rr
)
8153 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8155 typedef gold::Default_scan_relocatable_relocs
<Classify_reloc
>
8156 Scan_relocatable_relocs
;
8158 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8160 gold::scan_relocatable_relocs
<size
, big_endian
, Scan_relocatable_relocs
>(
8168 needs_special_offset_handling
,
8174 // Scan the relocs for --emit-relocs.
8176 template<int size
, bool big_endian
>
8178 Target_aarch64
<size
, big_endian
>::emit_relocs_scan(
8179 Symbol_table
* symtab
,
8181 Sized_relobj_file
<size
, big_endian
>* object
,
8182 unsigned int data_shndx
,
8183 unsigned int sh_type
,
8184 const unsigned char* prelocs
,
8186 Output_section
* output_section
,
8187 bool needs_special_offset_handling
,
8188 size_t local_symbol_count
,
8189 const unsigned char* plocal_syms
,
8190 Relocatable_relocs
* rr
)
8192 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8194 typedef gold::Default_emit_relocs_strategy
<Classify_reloc
>
8195 Emit_relocs_strategy
;
8197 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8199 gold::scan_relocatable_relocs
<size
, big_endian
, Emit_relocs_strategy
>(
8207 needs_special_offset_handling
,
8213 // Relocate a section during a relocatable link.
8215 template<int size
, bool big_endian
>
8217 Target_aarch64
<size
, big_endian
>::relocate_relocs(
8218 const Relocate_info
<size
, big_endian
>* relinfo
,
8219 unsigned int sh_type
,
8220 const unsigned char* prelocs
,
8222 Output_section
* output_section
,
8223 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
8224 unsigned char* view
,
8225 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
8226 section_size_type view_size
,
8227 unsigned char* reloc_view
,
8228 section_size_type reloc_view_size
)
8230 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8233 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8235 gold::relocate_relocs
<size
, big_endian
, Classify_reloc
>(
8240 offset_in_output_section
,
8249 // Return whether this is a 3-insn erratum sequence.
8251 template<int size
, bool big_endian
>
8253 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
8254 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8255 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
8256 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
8261 // The 2nd insn is a single register load or store; or register pair
8263 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
8264 && (!pair
|| (pair
&& !load
)))
8266 // The 3rd insn is a load or store instruction from the "Load/store
8267 // register (unsigned immediate)" encoding class, using Rn as the
8268 // base address register.
8269 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
8270 && (Insn_utilities::aarch64_rn(insn3
)
8271 == Insn_utilities::aarch64_rd(insn1
)))
8278 // Return whether this is a 835769 sequence.
8279 // (Similarly implemented as in elfnn-aarch64.c.)
8281 template<int size
, bool big_endian
>
8283 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
8284 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8285 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
8295 if (Insn_utilities::aarch64_mlxl(insn2
)
8296 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
8298 /* Any SIMD memory op is independent of the subsequent MLA
8299 by definition of the erratum. */
8300 if (Insn_utilities::aarch64_bit(insn1
, 26))
8303 /* If not SIMD, check for integer memory ops and MLA relationship. */
8304 rn
= Insn_utilities::aarch64_rn(insn2
);
8305 ra
= Insn_utilities::aarch64_ra(insn2
);
8306 rm
= Insn_utilities::aarch64_rm(insn2
);
8308 /* If this is a load and there's a true(RAW) dependency, we are safe
8309 and this is not an erratum sequence. */
8311 (rt
== rn
|| rt
== rm
|| rt
== ra
8312 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
8315 /* We conservatively put out stubs for all other cases (including
8324 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8326 template<int size
, bool big_endian
>
8328 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
8329 AArch64_relobj
<size
, big_endian
>* relobj
,
8331 section_size_type erratum_insn_offset
,
8332 Address erratum_address
,
8333 typename
Insn_utilities::Insntype erratum_insn
,
8335 unsigned int e843419_adrp_offset
)
8337 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
8338 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
8339 gold_assert(stub_table
!= NULL
);
8340 if (stub_table
->find_erratum_stub(relobj
,
8342 erratum_insn_offset
) == NULL
)
8344 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8345 The_erratum_stub
* stub
;
8346 if (erratum_type
== ST_E_835769
)
8347 stub
= new The_erratum_stub(relobj
, erratum_type
, shndx
,
8348 erratum_insn_offset
);
8349 else if (erratum_type
== ST_E_843419
)
8350 stub
= new E843419_stub
<size
, big_endian
>(
8351 relobj
, shndx
, erratum_insn_offset
, e843419_adrp_offset
);
8354 stub
->set_erratum_insn(erratum_insn
);
8355 stub
->set_erratum_address(erratum_address
);
8356 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8357 // always the next insn after erratum insn.
8358 stub
->set_destination_address(erratum_address
+ BPI
);
8359 stub_table
->add_erratum_stub(stub
);
8364 // Scan erratum for section SHNDX range [output_address + span_start,
8365 // output_address + span_end). Note here we do not share the code with
8366 // scan_erratum_843419_span function, because for 843419 we optimize by only
8367 // scanning the last few insns of a page, whereas for 835769, we need to scan
8370 template<int size
, bool big_endian
>
8372 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
8373 AArch64_relobj
<size
, big_endian
>* relobj
,
8375 const section_size_type span_start
,
8376 const section_size_type span_end
,
8377 unsigned char* input_view
,
8378 Address output_address
)
8380 typedef typename
Insn_utilities::Insntype Insntype
;
8382 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8384 // Adjust output_address and view to the start of span.
8385 output_address
+= span_start
;
8386 input_view
+= span_start
;
8388 section_size_type span_length
= span_end
- span_start
;
8389 section_size_type offset
= 0;
8390 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
8392 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8393 Insntype insn1
= ip
[0];
8394 Insntype insn2
= ip
[1];
8395 if (is_erratum_835769_sequence(insn1
, insn2
))
8397 Insntype erratum_insn
= insn2
;
8398 // "span_start + offset" is the offset for insn1. So for insn2, it is
8399 // "span_start + offset + BPI".
8400 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
8401 Address erratum_address
= output_address
+ offset
+ BPI
;
8402 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8403 "section %d, offset 0x%08x."),
8404 relobj
->name().c_str(), shndx
,
8405 (unsigned int)(span_start
+ offset
));
8407 this->create_erratum_stub(relobj
, shndx
,
8408 erratum_insn_offset
, erratum_address
,
8409 erratum_insn
, ST_E_835769
);
8410 offset
+= BPI
; // Skip mac insn.
8413 } // End of "Target_aarch64::scan_erratum_835769_span".
8416 // Scan erratum for section SHNDX range
8417 // [output_address + span_start, output_address + span_end).
8419 template<int size
, bool big_endian
>
8421 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
8422 AArch64_relobj
<size
, big_endian
>* relobj
,
8424 const section_size_type span_start
,
8425 const section_size_type span_end
,
8426 unsigned char* input_view
,
8427 Address output_address
)
8429 typedef typename
Insn_utilities::Insntype Insntype
;
8431 // Adjust output_address and view to the start of span.
8432 output_address
+= span_start
;
8433 input_view
+= span_start
;
8435 if ((output_address
& 0x03) != 0)
8438 section_size_type offset
= 0;
8439 section_size_type span_length
= span_end
- span_start
;
8440 // The first instruction must be ending at 0xFF8 or 0xFFC.
8441 unsigned int page_offset
= output_address
& 0xFFF;
8442 // Make sure starting position, that is "output_address+offset",
8443 // starts at page position 0xff8 or 0xffc.
8444 if (page_offset
< 0xff8)
8445 offset
= 0xff8 - page_offset
;
8446 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8448 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8449 Insntype insn1
= ip
[0];
8450 if (Insn_utilities::is_adrp(insn1
))
8452 Insntype insn2
= ip
[1];
8453 Insntype insn3
= ip
[2];
8454 Insntype erratum_insn
;
8455 unsigned insn_offset
;
8456 bool do_report
= false;
8457 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
8460 erratum_insn
= insn3
;
8461 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
8463 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8465 // Optionally we can have an insn between ins2 and ins3
8466 Insntype insn_opt
= ip
[2];
8467 // And insn_opt must not be a branch.
8468 if (!Insn_utilities::aarch64_b(insn_opt
)
8469 && !Insn_utilities::aarch64_bl(insn_opt
)
8470 && !Insn_utilities::aarch64_blr(insn_opt
)
8471 && !Insn_utilities::aarch64_br(insn_opt
))
8473 // And insn_opt must not write to dest reg in insn1. However
8474 // we do a conservative scan, which means we may fix/report
8475 // more than necessary, but it doesn't hurt.
8477 Insntype insn4
= ip
[3];
8478 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8481 erratum_insn
= insn4
;
8482 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8488 unsigned int erratum_insn_offset
=
8489 span_start
+ offset
+ insn_offset
;
8490 Address erratum_address
=
8491 output_address
+ offset
+ insn_offset
;
8492 create_erratum_stub(relobj
, shndx
,
8493 erratum_insn_offset
, erratum_address
,
8494 erratum_insn
, ST_E_843419
,
8495 span_start
+ offset
);
8499 // Advance to next candidate instruction. We only consider instruction
8500 // sequences starting at a page offset of 0xff8 or 0xffc.
8501 page_offset
= (output_address
+ offset
) & 0xfff;
8502 if (page_offset
== 0xff8)
8504 else // (page_offset == 0xffc), we move to next page's 0xff8.
8507 } // End of "Target_aarch64::scan_erratum_843419_span".
8510 // The selector for aarch64 object files.
8512 template<int size
, bool big_endian
>
8513 class Target_selector_aarch64
: public Target_selector
8516 Target_selector_aarch64();
8519 do_instantiate_target()
8520 { return new Target_aarch64
<size
, big_endian
>(); }
8524 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8525 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8526 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8530 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8531 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8532 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8536 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8537 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8538 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8542 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8543 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8544 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8547 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8548 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8549 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8550 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8552 } // End anonymous namespace.