1 // aarch64.cc -- aarch64 target support for gold.
3 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
4 // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
31 #include "parameters.h"
38 #include "copy-relocs.h"
40 #include "target-reloc.h"
41 #include "target-select.h"
47 #include "aarch64-reloc-property.h"
49 // The first three .got.plt entries are reserved.
50 const int32_t AARCH64_GOTPLT_RESERVE_COUNT
= 3;
58 template<int size
, bool big_endian
>
59 class Output_data_plt_aarch64
;
61 template<int size
, bool big_endian
>
62 class Output_data_plt_aarch64_standard
;
64 template<int size
, bool big_endian
>
67 template<int size
, bool big_endian
>
68 class AArch64_relocate_functions
;
70 // Utility class dealing with insns. This is ported from macros in
71 // bfd/elfnn-aarch64.cc, but wrapped inside a class as static members. This
72 // class is used in erratum sequence scanning.
74 template<bool big_endian
>
75 class AArch64_insn_utilities
78 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
80 static const int BYTES_PER_INSN
;
82 // Zero register encoding - 31.
83 static const unsigned int AARCH64_ZR
;
86 aarch64_bit(Insntype insn
, int pos
)
87 { return ((1 << pos
) & insn
) >> pos
; }
90 aarch64_bits(Insntype insn
, int pos
, int l
)
91 { return (insn
>> pos
) & ((1 << l
) - 1); }
93 // Get the encoding field "op31" of 3-source data processing insns. "op31" is
94 // the name defined in armv8 insn manual C3.5.9.
96 aarch64_op31(Insntype insn
)
97 { return aarch64_bits(insn
, 21, 3); }
99 // Get the encoding field "ra" of 3-source data processing insns. "ra" is the
100 // third source register. See armv8 insn manual C3.5.9.
102 aarch64_ra(Insntype insn
)
103 { return aarch64_bits(insn
, 10, 5); }
106 is_adr(const Insntype insn
)
107 { return (insn
& 0x9F000000) == 0x10000000; }
110 is_adrp(const Insntype insn
)
111 { return (insn
& 0x9F000000) == 0x90000000; }
114 is_mrs_tpidr_el0(const Insntype insn
)
115 { return (insn
& 0xFFFFFFE0) == 0xd53bd040; }
118 aarch64_rm(const Insntype insn
)
119 { return aarch64_bits(insn
, 16, 5); }
122 aarch64_rn(const Insntype insn
)
123 { return aarch64_bits(insn
, 5, 5); }
126 aarch64_rd(const Insntype insn
)
127 { return aarch64_bits(insn
, 0, 5); }
130 aarch64_rt(const Insntype insn
)
131 { return aarch64_bits(insn
, 0, 5); }
134 aarch64_rt2(const Insntype insn
)
135 { return aarch64_bits(insn
, 10, 5); }
137 // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M).
139 aarch64_adr_encode_imm(Insntype adr
, int imm21
)
141 gold_assert(is_adr(adr
));
142 gold_assert(-(1 << 20) <= imm21
&& imm21
< (1 << 20));
143 const int mask19
= (1 << 19) - 1;
145 adr
&= ~((mask19
<< 5) | (mask2
<< 29));
146 adr
|= ((imm21
& mask2
) << 29) | (((imm21
>> 2) & mask19
) << 5);
150 // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by
151 // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and
152 // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0.
154 aarch64_adrp_decode_imm(const Insntype adrp
)
156 const int mask19
= (1 << 19) - 1;
158 gold_assert(is_adrp(adrp
));
159 // 21-bit imm encoded in adrp.
160 uint64_t imm
= ((adrp
>> 29) & mask2
) | (((adrp
>> 5) & mask19
) << 2);
161 // Retrieve msb of 21-bit-signed imm for sign extension.
162 uint64_t msbt
= (imm
>> 20) & 1;
163 // Real value is imm multiplied by 4k. Value now has 33-bit information.
164 int64_t value
= imm
<< 12;
165 // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it
167 return ((((uint64_t)(1) << 32) - msbt
) << 33) | value
;
171 aarch64_b(const Insntype insn
)
172 { return (insn
& 0xFC000000) == 0x14000000; }
175 aarch64_bl(const Insntype insn
)
176 { return (insn
& 0xFC000000) == 0x94000000; }
179 aarch64_blr(const Insntype insn
)
180 { return (insn
& 0xFFFFFC1F) == 0xD63F0000; }
183 aarch64_br(const Insntype insn
)
184 { return (insn
& 0xFFFFFC1F) == 0xD61F0000; }
186 // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for
187 // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops.
189 aarch64_ld(Insntype insn
) { return aarch64_bit(insn
, 22) == 1; }
192 aarch64_ldst(Insntype insn
)
193 { return (insn
& 0x0a000000) == 0x08000000; }
196 aarch64_ldst_ex(Insntype insn
)
197 { return (insn
& 0x3f000000) == 0x08000000; }
200 aarch64_ldst_pcrel(Insntype insn
)
201 { return (insn
& 0x3b000000) == 0x18000000; }
204 aarch64_ldst_nap(Insntype insn
)
205 { return (insn
& 0x3b800000) == 0x28000000; }
208 aarch64_ldstp_pi(Insntype insn
)
209 { return (insn
& 0x3b800000) == 0x28800000; }
212 aarch64_ldstp_o(Insntype insn
)
213 { return (insn
& 0x3b800000) == 0x29000000; }
216 aarch64_ldstp_pre(Insntype insn
)
217 { return (insn
& 0x3b800000) == 0x29800000; }
220 aarch64_ldst_ui(Insntype insn
)
221 { return (insn
& 0x3b200c00) == 0x38000000; }
224 aarch64_ldst_piimm(Insntype insn
)
225 { return (insn
& 0x3b200c00) == 0x38000400; }
228 aarch64_ldst_u(Insntype insn
)
229 { return (insn
& 0x3b200c00) == 0x38000800; }
232 aarch64_ldst_preimm(Insntype insn
)
233 { return (insn
& 0x3b200c00) == 0x38000c00; }
236 aarch64_ldst_ro(Insntype insn
)
237 { return (insn
& 0x3b200c00) == 0x38200800; }
240 aarch64_ldst_uimm(Insntype insn
)
241 { return (insn
& 0x3b000000) == 0x39000000; }
244 aarch64_ldst_simd_m(Insntype insn
)
245 { return (insn
& 0xbfbf0000) == 0x0c000000; }
248 aarch64_ldst_simd_m_pi(Insntype insn
)
249 { return (insn
& 0xbfa00000) == 0x0c800000; }
252 aarch64_ldst_simd_s(Insntype insn
)
253 { return (insn
& 0xbf9f0000) == 0x0d000000; }
256 aarch64_ldst_simd_s_pi(Insntype insn
)
257 { return (insn
& 0xbf800000) == 0x0d800000; }
259 // Classify an INSN if it is indeed a load/store. Return true if INSN is a
260 // LD/ST instruction otherwise return false. For scalar LD/ST instructions
261 // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair
262 // instructions PAIR is TRUE, RT and RT2 are returned.
264 aarch64_mem_op_p(Insntype insn
, unsigned int *rt
, unsigned int *rt2
,
265 bool *pair
, bool *load
)
273 /* Bail out quickly if INSN doesn't fall into the 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 // Comparator used to group Erratum_stubs in a set by (obj, shndx,
1035 // sh_offset). We do not include 'type' in the calculation, because there is
1036 // at most one stub type at (obj, shndx, sh_offset).
1038 operator<(const Erratum_stub
<size
, big_endian
>& k
) const
1042 // We group stubs by relobj.
1043 if (this->relobj_
!= k
.relobj_
)
1044 return this->relobj_
< k
.relobj_
;
1045 // Then by section index.
1046 if (this->shndx_
!= k
.shndx_
)
1047 return this->shndx_
< k
.shndx_
;
1048 // Lastly by section offset.
1049 return this->sh_offset_
< k
.sh_offset_
;
1053 invalidate_erratum_stub()
1055 gold_assert(this->relobj_
!= NULL
);
1056 this->relobj_
= NULL
;
1060 is_invalidated_erratum_stub()
1061 { return this->relobj_
== NULL
; }
1065 do_write(unsigned char*, section_size_type
);
1068 // The object that needs to be fixed.
1069 The_aarch64_relobj
* relobj_
;
1070 // The shndx in the object that needs to be fixed.
1071 const unsigned int shndx_
;
1072 // The section offset in the obejct that needs to be fixed.
1073 const unsigned int sh_offset_
;
1074 // The insn to be fixed.
1075 Insntype erratum_insn_
;
1076 // The address of the above insn.
1077 AArch64_address erratum_address_
;
1078 }; // End of "Erratum_stub".
1081 // Erratum sub class to wrap additional info needed by 843419. In fixing this
1082 // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need
1083 // adrp's code position (two or three insns before erratum insn itself).
1085 template<int size
, bool big_endian
>
1086 class E843419_stub
: public Erratum_stub
<size
, big_endian
>
1089 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
1091 E843419_stub(AArch64_relobj
<size
, big_endian
>* relobj
,
1092 unsigned int shndx
, unsigned int sh_offset
,
1093 unsigned int adrp_sh_offset
)
1094 : Erratum_stub
<size
, big_endian
>(relobj
, ST_E_843419
, shndx
, sh_offset
),
1095 adrp_sh_offset_(adrp_sh_offset
)
1099 adrp_sh_offset() const
1100 { return this->adrp_sh_offset_
; }
1103 // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we
1104 // can obtain it from its parent.)
1105 const unsigned int adrp_sh_offset_
;
1109 template<int size
, bool big_endian
>
1110 const int Erratum_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1112 // Comparator used in set definition.
1113 template<int size
, bool big_endian
>
1114 struct Erratum_stub_less
1117 operator()(const Erratum_stub
<size
, big_endian
>* s1
,
1118 const Erratum_stub
<size
, big_endian
>* s2
) const
1119 { return *s1
< *s2
; }
1122 // Erratum_stub implementation for writing stub to output file.
1124 template<int size
, bool big_endian
>
1126 Erratum_stub
<size
, big_endian
>::do_write(unsigned char* view
, section_size_type
)
1128 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1129 const Insntype
* insns
= this->insns();
1130 uint32_t num_insns
= this->insn_num();
1131 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1132 // For current implemented erratum 843419 and 835769, the first insn in the
1133 // stub is always a copy of the problematic insn (in 843419, the mem access
1134 // insn, in 835769, the mac insn), followed by a jump-back.
1135 elfcpp::Swap
<32, big_endian
>::writeval(ip
, this->erratum_insn());
1136 for (uint32_t i
= 1; i
< num_insns
; ++i
)
1137 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1141 // Reloc stub class.
1143 template<int size
, bool big_endian
>
1144 class Reloc_stub
: public Stub_base
<size
, big_endian
>
1147 typedef Reloc_stub
<size
, big_endian
> This
;
1148 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1150 // Branch range. This is used to calculate the section group size, as well as
1151 // determine whether a stub is needed.
1152 static const int MAX_BRANCH_OFFSET
= ((1 << 25) - 1) << 2;
1153 static const int MIN_BRANCH_OFFSET
= -((1 << 25) << 2);
1155 // Constant used to determine if an offset fits in the adrp instruction
1157 static const int MAX_ADRP_IMM
= (1 << 20) - 1;
1158 static const int MIN_ADRP_IMM
= -(1 << 20);
1160 static const int BYTES_PER_INSN
= 4;
1161 static const int STUB_ADDR_ALIGN
;
1163 // Determine whether the offset fits in the jump/branch instruction.
1165 aarch64_valid_branch_offset_p(int64_t offset
)
1166 { return offset
>= MIN_BRANCH_OFFSET
&& offset
<= MAX_BRANCH_OFFSET
; }
1168 // Determine whether the offset fits in the adrp immediate field.
1170 aarch64_valid_for_adrp_p(AArch64_address location
, AArch64_address dest
)
1172 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
1173 int64_t adrp_imm
= (Reloc::Page(dest
) - Reloc::Page(location
)) >> 12;
1174 return adrp_imm
>= MIN_ADRP_IMM
&& adrp_imm
<= MAX_ADRP_IMM
;
1177 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1180 stub_type_for_reloc(unsigned int r_type
, AArch64_address address
,
1181 AArch64_address target
);
1183 Reloc_stub(int type
)
1184 : Stub_base
<size
, big_endian
>(type
)
1190 // The key class used to index the stub instance in the stub table's stub map.
1194 Key(int type
, const Symbol
* symbol
, const Relobj
* relobj
,
1195 unsigned int r_sym
, int32_t addend
)
1196 : type_(type
), addend_(addend
)
1200 this->r_sym_
= Reloc_stub::invalid_index
;
1201 this->u_
.symbol
= symbol
;
1205 gold_assert(relobj
!= NULL
&& r_sym
!= invalid_index
);
1206 this->r_sym_
= r_sym
;
1207 this->u_
.relobj
= relobj
;
1214 // Return stub type.
1217 { return this->type_
; }
1219 // Return the local symbol index or invalid_index.
1222 { return this->r_sym_
; }
1224 // Return the symbol if there is one.
1227 { return this->r_sym_
== invalid_index
? this->u_
.symbol
: NULL
; }
1229 // Return the relobj if there is one.
1232 { return this->r_sym_
!= invalid_index
? this->u_
.relobj
: NULL
; }
1234 // Whether this equals to another key k.
1236 eq(const Key
& k
) const
1238 return ((this->type_
== k
.type_
)
1239 && (this->r_sym_
== k
.r_sym_
)
1240 && ((this->r_sym_
!= Reloc_stub::invalid_index
)
1241 ? (this->u_
.relobj
== k
.u_
.relobj
)
1242 : (this->u_
.symbol
== k
.u_
.symbol
))
1243 && (this->addend_
== k
.addend_
));
1246 // Return a hash value.
1250 size_t name_hash_value
= gold::string_hash
<char>(
1251 (this->r_sym_
!= Reloc_stub::invalid_index
)
1252 ? this->u_
.relobj
->name().c_str()
1253 : this->u_
.symbol
->name());
1254 // We only have 4 stub types.
1255 size_t stub_type_hash_value
= 0x03 & this->type_
;
1256 return (name_hash_value
1257 ^ stub_type_hash_value
1258 ^ ((this->r_sym_
& 0x3fff) << 2)
1259 ^ ((this->addend_
& 0xffff) << 16));
1262 // Functors for STL associative containers.
1266 operator()(const Key
& k
) const
1267 { return k
.hash_value(); }
1273 operator()(const Key
& k1
, const Key
& k2
) const
1274 { return k1
.eq(k2
); }
1280 // If this is a local symbol, this is the index in the defining object.
1281 // Otherwise, it is invalid_index for a global symbol.
1282 unsigned int r_sym_
;
1283 // If r_sym_ is an invalid index, this points to a global symbol.
1284 // Otherwise, it points to a relobj. We used the unsized and target
1285 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1286 // Arm_relobj, in order to avoid making the stub class a template
1287 // as most of the stub machinery is endianness-neutral. However, it
1288 // may require a bit of casting done by users of this class.
1291 const Symbol
* symbol
;
1292 const Relobj
* relobj
;
1294 // Addend associated with a reloc.
1296 }; // End of inner class Reloc_stub::Key
1299 // This may be overridden in the child class.
1301 do_write(unsigned char*, section_size_type
);
1304 static const unsigned int invalid_index
= static_cast<unsigned int>(-1);
1305 }; // End of Reloc_stub
1307 template<int size
, bool big_endian
>
1308 const int Reloc_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1310 // Write data to output file.
1312 template<int size
, bool big_endian
>
1314 Reloc_stub
<size
, big_endian
>::
1315 do_write(unsigned char* view
, section_size_type
)
1317 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1318 const uint32_t* insns
= this->insns();
1319 uint32_t num_insns
= this->insn_num();
1320 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1321 for (uint32_t i
= 0; i
< num_insns
; ++i
)
1322 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1326 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1329 template<int size
, bool big_endian
>
1331 Reloc_stub
<size
, big_endian
>::stub_type_for_reloc(
1332 unsigned int r_type
, AArch64_address location
, AArch64_address dest
)
1334 int64_t branch_offset
= 0;
1337 case elfcpp::R_AARCH64_CALL26
:
1338 case elfcpp::R_AARCH64_JUMP26
:
1339 branch_offset
= dest
- location
;
1345 if (aarch64_valid_branch_offset_p(branch_offset
))
1348 if (aarch64_valid_for_adrp_p(location
, dest
))
1349 return ST_ADRP_BRANCH
;
1351 // Always use PC-relative addressing in case of -shared or -pie.
1352 if (parameters
->options().output_is_position_independent())
1353 return ST_LONG_BRANCH_PCREL
;
1355 // This saves 2 insns per stub, compared to ST_LONG_BRANCH_PCREL.
1356 // But is only applicable to non-shared or non-pie.
1357 return ST_LONG_BRANCH_ABS
;
1360 // A class to hold stubs for the ARM target. This contains 2 different types of
1361 // stubs - reloc stubs and erratum stubs.
1363 template<int size
, bool big_endian
>
1364 class Stub_table
: public Output_data
1367 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1368 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1369 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
1370 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1371 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
1372 typedef typename
The_reloc_stub::Key The_reloc_stub_key
;
1373 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1374 typedef Erratum_stub_less
<size
, big_endian
> The_erratum_stub_less
;
1375 typedef typename
The_reloc_stub_key::hash The_reloc_stub_key_hash
;
1376 typedef typename
The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to
;
1377 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1378 typedef Unordered_map
<The_reloc_stub_key
, The_reloc_stub
*,
1379 The_reloc_stub_key_hash
, The_reloc_stub_key_equal_to
>
1381 typedef typename
Reloc_stub_map::const_iterator Reloc_stub_map_const_iter
;
1382 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
1384 typedef std::set
<The_erratum_stub
*, The_erratum_stub_less
> Erratum_stub_set
;
1385 typedef typename
Erratum_stub_set::iterator Erratum_stub_set_iter
;
1387 Stub_table(The_aarch64_input_section
* owner
)
1388 : Output_data(), owner_(owner
), reloc_stubs_size_(0),
1389 erratum_stubs_size_(0), prev_data_size_(0)
1395 The_aarch64_input_section
*
1399 // Whether this stub table is empty.
1402 { return reloc_stubs_
.empty() && erratum_stubs_
.empty(); }
1404 // Return the current data size.
1406 current_data_size() const
1407 { return this->current_data_size_for_child(); }
1409 // Add a STUB using KEY. The caller is responsible for avoiding addition
1410 // if a STUB with the same key has already been added.
1412 add_reloc_stub(The_reloc_stub
* stub
, const The_reloc_stub_key
& key
);
1414 // Add an erratum stub into the erratum stub set. The set is ordered by
1415 // (relobj, shndx, sh_offset).
1417 add_erratum_stub(The_erratum_stub
* stub
);
1419 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1421 find_erratum_stub(The_aarch64_relobj
* a64relobj
,
1422 unsigned int shndx
, unsigned int sh_offset
);
1424 // Find all the erratums for a given input section. The return value is a pair
1425 // of iterators [begin, end).
1426 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1427 find_erratum_stubs_for_input_section(The_aarch64_relobj
* a64relobj
,
1428 unsigned int shndx
);
1430 // Compute the erratum stub address.
1432 erratum_stub_address(The_erratum_stub
* stub
) const
1434 AArch64_address r
= align_address(this->address() + this->reloc_stubs_size_
,
1435 The_erratum_stub::STUB_ADDR_ALIGN
);
1436 r
+= stub
->offset();
1440 // Finalize stubs. No-op here, just for completeness.
1445 // Look up a relocation stub using KEY. Return NULL if there is none.
1447 find_reloc_stub(The_reloc_stub_key
& key
)
1449 Reloc_stub_map_const_iter p
= this->reloc_stubs_
.find(key
);
1450 return (p
!= this->reloc_stubs_
.end()) ? p
->second
: NULL
;
1453 // Relocate reloc stubs in this stub table. This does not relocate erratum stubs.
1455 relocate_reloc_stubs(const The_relocate_info
*,
1456 The_target_aarch64
*,
1462 // Relocate an erratum stub.
1464 relocate_erratum_stub(The_erratum_stub
*, unsigned char*);
1466 // Update data size at the end of a relaxation pass. Return true if data size
1467 // is different from that of the previous relaxation pass.
1469 update_data_size_changed_p()
1471 // No addralign changed here.
1472 off_t s
= align_address(this->reloc_stubs_size_
,
1473 The_erratum_stub::STUB_ADDR_ALIGN
)
1474 + this->erratum_stubs_size_
;
1475 bool changed
= (s
!= this->prev_data_size_
);
1476 this->prev_data_size_
= s
;
1481 // Write out section contents.
1483 do_write(Output_file
*);
1485 // Return the required alignment.
1487 do_addralign() const
1489 return std::max(The_reloc_stub::STUB_ADDR_ALIGN
,
1490 The_erratum_stub::STUB_ADDR_ALIGN
);
1493 // Reset address and file offset.
1495 do_reset_address_and_file_offset()
1496 { this->set_current_data_size_for_child(this->prev_data_size_
); }
1498 // Set final data size.
1500 set_final_data_size()
1501 { this->set_data_size(this->current_data_size()); }
1504 // Relocate one reloc stub.
1506 relocate_reloc_stub(The_reloc_stub
*,
1507 const The_relocate_info
*,
1508 The_target_aarch64
*,
1515 // Owner of this stub table.
1516 The_aarch64_input_section
* owner_
;
1517 // The relocation stubs.
1518 Reloc_stub_map reloc_stubs_
;
1519 // The erratum stubs.
1520 Erratum_stub_set erratum_stubs_
;
1521 // Size of reloc stubs.
1522 off_t reloc_stubs_size_
;
1523 // Size of erratum stubs.
1524 off_t erratum_stubs_size_
;
1525 // data size of this in the previous pass.
1526 off_t prev_data_size_
;
1527 }; // End of Stub_table
1530 // Add an erratum stub into the erratum stub set. The set is ordered by
1531 // (relobj, shndx, sh_offset).
1533 template<int size
, bool big_endian
>
1535 Stub_table
<size
, big_endian
>::add_erratum_stub(The_erratum_stub
* stub
)
1537 std::pair
<Erratum_stub_set_iter
, bool> ret
=
1538 this->erratum_stubs_
.insert(stub
);
1539 gold_assert(ret
.second
);
1540 this->erratum_stubs_size_
= align_address(
1541 this->erratum_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1542 stub
->set_offset(this->erratum_stubs_size_
);
1543 this->erratum_stubs_size_
+= stub
->stub_size();
1547 // Find if such erratum exists for given (obj, shndx, sh_offset).
1549 template<int size
, bool big_endian
>
1550 Erratum_stub
<size
, big_endian
>*
1551 Stub_table
<size
, big_endian
>::find_erratum_stub(
1552 The_aarch64_relobj
* a64relobj
, unsigned int shndx
, unsigned int sh_offset
)
1554 // A dummy object used as key to search in the set.
1555 The_erratum_stub
key(a64relobj
, ST_NONE
,
1557 Erratum_stub_set_iter i
= this->erratum_stubs_
.find(&key
);
1558 if (i
!= this->erratum_stubs_
.end())
1560 The_erratum_stub
* stub(*i
);
1561 gold_assert(stub
->erratum_insn() != 0);
1568 // Find all the errata for a given input section. The return value is a pair of
1569 // iterators [begin, end).
1571 template<int size
, bool big_endian
>
1572 std::pair
<typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
,
1573 typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
>
1574 Stub_table
<size
, big_endian
>::find_erratum_stubs_for_input_section(
1575 The_aarch64_relobj
* a64relobj
, unsigned int shndx
)
1577 typedef std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
> Result_pair
;
1578 Erratum_stub_set_iter start
, end
;
1579 The_erratum_stub
low_key(a64relobj
, ST_NONE
, shndx
, 0);
1580 start
= this->erratum_stubs_
.lower_bound(&low_key
);
1581 if (start
== this->erratum_stubs_
.end())
1582 return Result_pair(this->erratum_stubs_
.end(),
1583 this->erratum_stubs_
.end());
1585 while (end
!= this->erratum_stubs_
.end() &&
1586 (*end
)->relobj() == a64relobj
&& (*end
)->shndx() == shndx
)
1588 return Result_pair(start
, end
);
1592 // Add a STUB using KEY. The caller is responsible for avoiding addition
1593 // if a STUB with the same key has already been added.
1595 template<int size
, bool big_endian
>
1597 Stub_table
<size
, big_endian
>::add_reloc_stub(
1598 The_reloc_stub
* stub
, const The_reloc_stub_key
& key
)
1600 gold_assert(stub
->type() == key
.type());
1601 this->reloc_stubs_
[key
] = stub
;
1603 // Assign stub offset early. We can do this because we never remove
1604 // reloc stubs and they are in the beginning of the stub table.
1605 this->reloc_stubs_size_
= align_address(this->reloc_stubs_size_
,
1606 The_reloc_stub::STUB_ADDR_ALIGN
);
1607 stub
->set_offset(this->reloc_stubs_size_
);
1608 this->reloc_stubs_size_
+= stub
->stub_size();
1612 // Relocate an erratum stub.
1614 template<int size
, bool big_endian
>
1616 Stub_table
<size
, big_endian
>::
1617 relocate_erratum_stub(The_erratum_stub
* estub
,
1618 unsigned char* view
)
1620 // Just for convenience.
1621 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1623 gold_assert(!estub
->is_invalidated_erratum_stub());
1624 AArch64_address stub_address
= this->erratum_stub_address(estub
);
1625 // The address of "b" in the stub that is to be "relocated".
1626 AArch64_address stub_b_insn_address
;
1627 // Branch offset that is to be filled in "b" insn.
1629 switch (estub
->type())
1633 // The 1st insn of the erratum could be a relocation spot,
1634 // in this case we need to fix it with
1635 // "(*i)->erratum_insn()".
1636 elfcpp::Swap
<32, big_endian
>::writeval(
1637 view
+ (stub_address
- this->address()),
1638 estub
->erratum_insn());
1639 // For the erratum, the 2nd insn is a b-insn to be patched
1641 stub_b_insn_address
= stub_address
+ 1 * BPI
;
1642 b_offset
= estub
->destination_address() - stub_b_insn_address
;
1643 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1644 view
+ (stub_b_insn_address
- this->address()),
1645 ((unsigned int)(b_offset
)) & 0xfffffff);
1651 estub
->invalidate_erratum_stub();
1655 // Relocate only reloc stubs in this stub table. This does not relocate erratum
1658 template<int size
, bool big_endian
>
1660 Stub_table
<size
, big_endian
>::
1661 relocate_reloc_stubs(const The_relocate_info
* relinfo
,
1662 The_target_aarch64
* target_aarch64
,
1663 Output_section
* output_section
,
1664 unsigned char* view
,
1665 AArch64_address address
,
1666 section_size_type view_size
)
1668 // "view_size" is the total size of the stub_table.
1669 gold_assert(address
== this->address() &&
1670 view_size
== static_cast<section_size_type
>(this->data_size()));
1671 for(Reloc_stub_map_const_iter p
= this->reloc_stubs_
.begin();
1672 p
!= this->reloc_stubs_
.end(); ++p
)
1673 relocate_reloc_stub(p
->second
, relinfo
, target_aarch64
, output_section
,
1674 view
, address
, view_size
);
1678 // Relocate one reloc stub. This is a helper for
1679 // Stub_table::relocate_reloc_stubs().
1681 template<int size
, bool big_endian
>
1683 Stub_table
<size
, big_endian
>::
1684 relocate_reloc_stub(The_reloc_stub
* stub
,
1685 const The_relocate_info
* relinfo
,
1686 The_target_aarch64
* target_aarch64
,
1687 Output_section
* output_section
,
1688 unsigned char* view
,
1689 AArch64_address address
,
1690 section_size_type view_size
)
1692 // "offset" is the offset from the beginning of the stub_table.
1693 section_size_type offset
= stub
->offset();
1694 section_size_type stub_size
= stub
->stub_size();
1695 // "view_size" is the total size of the stub_table.
1696 gold_assert(offset
+ stub_size
<= view_size
);
1698 target_aarch64
->relocate_reloc_stub(stub
, relinfo
, output_section
,
1699 view
+ offset
, address
+ offset
, view_size
);
1703 // Write out the stubs to file.
1705 template<int size
, bool big_endian
>
1707 Stub_table
<size
, big_endian
>::do_write(Output_file
* of
)
1709 off_t offset
= this->offset();
1710 const section_size_type oview_size
=
1711 convert_to_section_size_type(this->data_size());
1712 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1714 // Write relocation stubs.
1715 for (typename
Reloc_stub_map::const_iterator p
= this->reloc_stubs_
.begin();
1716 p
!= this->reloc_stubs_
.end(); ++p
)
1718 The_reloc_stub
* stub
= p
->second
;
1719 AArch64_address address
= this->address() + stub
->offset();
1720 gold_assert(address
==
1721 align_address(address
, The_reloc_stub::STUB_ADDR_ALIGN
));
1722 stub
->write(oview
+ stub
->offset(), stub
->stub_size());
1725 // Write erratum stubs.
1726 unsigned int erratum_stub_start_offset
=
1727 align_address(this->reloc_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1728 for (typename
Erratum_stub_set::iterator p
= this->erratum_stubs_
.begin();
1729 p
!= this->erratum_stubs_
.end(); ++p
)
1731 The_erratum_stub
* stub(*p
);
1732 stub
->write(oview
+ erratum_stub_start_offset
+ stub
->offset(),
1736 of
->write_output_view(this->offset(), oview_size
, oview
);
1740 // AArch64_relobj class.
1742 template<int size
, bool big_endian
>
1743 class AArch64_relobj
: public Sized_relobj_file
<size
, big_endian
>
1746 typedef AArch64_relobj
<size
, big_endian
> This
;
1747 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1748 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1749 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1750 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1751 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1752 typedef typename
The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter
;
1753 typedef std::vector
<The_stub_table
*> Stub_table_list
;
1754 static const AArch64_address invalid_address
=
1755 static_cast<AArch64_address
>(-1);
1757 AArch64_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1758 const typename
elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1759 : Sized_relobj_file
<size
, big_endian
>(name
, input_file
, offset
, ehdr
),
1766 // Return the stub table of the SHNDX-th section if there is one.
1768 stub_table(unsigned int shndx
) const
1770 gold_assert(shndx
< this->stub_tables_
.size());
1771 return this->stub_tables_
[shndx
];
1774 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1776 set_stub_table(unsigned int shndx
, The_stub_table
* stub_table
)
1778 gold_assert(shndx
< this->stub_tables_
.size());
1779 this->stub_tables_
[shndx
] = stub_table
;
1782 // Entrance to errata scanning.
1784 scan_errata(unsigned int shndx
,
1785 const elfcpp::Shdr
<size
, big_endian
>&,
1786 Output_section
*, const Symbol_table
*,
1787 The_target_aarch64
*);
1789 // Scan all relocation sections for stub generation.
1791 scan_sections_for_stubs(The_target_aarch64
*, const Symbol_table
*,
1794 // Whether a section is a scannable text section.
1796 text_section_is_scannable(const elfcpp::Shdr
<size
, big_endian
>&, unsigned int,
1797 const Output_section
*, const Symbol_table
*);
1799 // Convert regular input section with index SHNDX to a relaxed section.
1801 convert_input_section_to_relaxed_section(unsigned shndx
)
1803 // The stubs have relocations and we need to process them after writing
1804 // out the stubs. So relocation now must follow section write.
1805 this->set_section_offset(shndx
, -1ULL);
1806 this->set_relocs_must_follow_section_writes();
1809 // Structure for mapping symbol position.
1810 struct Mapping_symbol_position
1812 Mapping_symbol_position(unsigned int shndx
, AArch64_address offset
):
1813 shndx_(shndx
), offset_(offset
)
1816 // "<" comparator used in ordered_map container.
1818 operator<(const Mapping_symbol_position
& p
) const
1820 return (this->shndx_
< p
.shndx_
1821 || (this->shndx_
== p
.shndx_
&& this->offset_
< p
.offset_
));
1825 unsigned int shndx_
;
1828 AArch64_address offset_
;
1831 typedef std::map
<Mapping_symbol_position
, char> Mapping_symbol_info
;
1834 // Post constructor setup.
1838 // Call parent's setup method.
1839 Sized_relobj_file
<size
, big_endian
>::do_setup();
1841 // Initialize look-up tables.
1842 this->stub_tables_
.resize(this->shnum());
1846 do_relocate_sections(
1847 const Symbol_table
* symtab
, const Layout
* layout
,
1848 const unsigned char* pshdrs
, Output_file
* of
,
1849 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1851 // Count local symbols and (optionally) record mapping info.
1853 do_count_local_symbols(Stringpool_template
<char>*,
1854 Stringpool_template
<char>*);
1857 // Fix all errata in the object, and for each erratum, relocate corresponding
1860 fix_errata_and_relocate_erratum_stubs(
1861 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1863 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1866 try_fix_erratum_843419_optimized(
1868 typename Sized_relobj_file
<size
, big_endian
>::View_size
&);
1870 // Whether a section needs to be scanned for relocation stubs.
1872 section_needs_reloc_stub_scanning(const elfcpp::Shdr
<size
, big_endian
>&,
1873 const Relobj::Output_sections
&,
1874 const Symbol_table
*, const unsigned char*);
1876 // List of stub tables.
1877 Stub_table_list stub_tables_
;
1879 // Mapping symbol information sorted by (section index, section_offset).
1880 Mapping_symbol_info mapping_symbol_info_
;
1881 }; // End of AArch64_relobj
1884 // Override to record mapping symbol information.
1885 template<int size
, bool big_endian
>
1887 AArch64_relobj
<size
, big_endian
>::do_count_local_symbols(
1888 Stringpool_template
<char>* pool
, Stringpool_template
<char>* dynpool
)
1890 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(pool
, dynpool
);
1892 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1893 // processing if not fixing erratum.
1894 if (!parameters
->options().fix_cortex_a53_843419()
1895 && !parameters
->options().fix_cortex_a53_835769())
1898 const unsigned int loccount
= this->local_symbol_count();
1902 // Read the symbol table section header.
1903 const unsigned int symtab_shndx
= this->symtab_shndx();
1904 elfcpp::Shdr
<size
, big_endian
>
1905 symtabshdr(this, this->elf_file()->section_header(symtab_shndx
));
1906 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1908 // Read the local symbols.
1909 const int sym_size
=elfcpp::Elf_sizes
<size
>::sym_size
;
1910 gold_assert(loccount
== symtabshdr
.get_sh_info());
1911 off_t locsize
= loccount
* sym_size
;
1912 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1913 locsize
, true, true);
1915 // For mapping symbol processing, we need to read the symbol names.
1916 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
1917 if (strtab_shndx
>= this->shnum())
1919 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
1923 elfcpp::Shdr
<size
, big_endian
>
1924 strtabshdr(this, this->elf_file()->section_header(strtab_shndx
));
1925 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
1927 this->error(_("symbol table name section has wrong type: %u"),
1928 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
1932 const char* pnames
=
1933 reinterpret_cast<const char*>(this->get_view(strtabshdr
.get_sh_offset(),
1934 strtabshdr
.get_sh_size(),
1937 // Skip the first dummy symbol.
1939 typename Sized_relobj_file
<size
, big_endian
>::Local_values
*
1940 plocal_values
= this->local_values();
1941 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1943 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1944 Symbol_value
<size
>& lv((*plocal_values
)[i
]);
1945 AArch64_address input_value
= lv
.input_value();
1947 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1948 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1950 // Mapping symbols could be one of the following 4 forms -
1955 const char* sym_name
= pnames
+ sym
.get_st_name();
1956 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1957 && (sym_name
[2] == '\0' || sym_name
[2] == '.'))
1960 unsigned int input_shndx
=
1961 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1962 gold_assert(is_ordinary
);
1964 Mapping_symbol_position
msp(input_shndx
, input_value
);
1965 // Insert mapping_symbol_info into map whose ordering is defined by
1966 // (shndx, offset_within_section).
1967 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1973 // Fix all errata in the object and for each erratum, we relocate the
1974 // corresponding erratum stub (by calling Stub_table::relocate_erratum_stub).
1976 template<int size
, bool big_endian
>
1978 AArch64_relobj
<size
, big_endian
>::fix_errata_and_relocate_erratum_stubs(
1979 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1981 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1982 unsigned int shnum
= this->shnum();
1983 for (unsigned int i
= 1; i
< shnum
; ++i
)
1985 The_stub_table
* stub_table
= this->stub_table(i
);
1988 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1989 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
1990 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
1993 The_erratum_stub
* stub
= *p
;
1994 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1995 pview((*pviews
)[i
]);
1997 // Double check data before fix.
1998 gold_assert(pview
.address
+ stub
->sh_offset()
1999 == stub
->erratum_address());
2001 // Update previously recorded erratum insn with relocated
2004 reinterpret_cast<Insntype
*>(pview
.view
+ stub
->sh_offset());
2005 Insntype insn_to_fix
= ip
[0];
2006 stub
->update_erratum_insn(insn_to_fix
);
2008 // First try to see if erratum is 843419 and if it can be fixed
2009 // without using branch-to-stub.
2010 if (!try_fix_erratum_843419_optimized(stub
, pview
))
2012 // Replace the erratum insn with a branch-to-stub.
2013 AArch64_address stub_address
=
2014 stub_table
->erratum_stub_address(stub
);
2015 unsigned int b_offset
= stub_address
- stub
->erratum_address();
2016 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
2017 pview
.view
+ stub
->sh_offset(), b_offset
& 0xfffffff);
2020 // Erratum fix is done (or skipped), continue to relocate erratum
2021 // stub. Note, when erratum fix is skipped (either because we
2022 // proactively change the code sequence or the code sequence is
2023 // changed by relaxation, etc), we can still safely relocate the
2024 // erratum stub, ignoring the fact the erratum could never be
2026 stub_table
->relocate_erratum_stub(
2027 stub
, pview
.view
+ (stub_table
->address() - pview
.address
));
2029 // Next erratum stub.
2036 // This is an optimization for 843419. This erratum requires the sequence begin
2037 // with 'adrp', when final value calculated by adrp fits in adr, we can just
2038 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
2039 // in this case, we do not delete the erratum stub (too late to do so), it is
2040 // merely generated without ever being called.)
2042 template<int size
, bool big_endian
>
2044 AArch64_relobj
<size
, big_endian
>::try_fix_erratum_843419_optimized(
2045 The_erratum_stub
* stub
,
2046 typename Sized_relobj_file
<size
, big_endian
>::View_size
& pview
)
2048 if (stub
->type() != ST_E_843419
)
2051 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2052 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
2053 E843419_stub
<size
, big_endian
>* e843419_stub
=
2054 reinterpret_cast<E843419_stub
<size
, big_endian
>*>(stub
);
2055 AArch64_address pc
= pview
.address
+ e843419_stub
->adrp_sh_offset();
2056 unsigned int adrp_offset
= e843419_stub
->adrp_sh_offset ();
2057 Insntype
* adrp_view
= reinterpret_cast<Insntype
*>(pview
.view
+ adrp_offset
);
2058 Insntype adrp_insn
= adrp_view
[0];
2060 // If the instruction at adrp_sh_offset is "mrs R, tpidr_el0", it may come
2061 // from IE -> LE relaxation etc. This is a side-effect of TLS relaxation that
2062 // ADRP has been turned into MRS, there is no erratum risk anymore.
2063 // Therefore, we return true to avoid doing unnecessary branch-to-stub.
2064 if (Insn_utilities::is_mrs_tpidr_el0(adrp_insn
))
2067 // If the instruction at adrp_sh_offset is not ADRP and the instruction before
2068 // it is "mrs R, tpidr_el0", it may come from LD -> LE relaxation etc.
2069 // Like the above case, there is no erratum risk any more, we can safely
2071 if (!Insn_utilities::is_adrp(adrp_insn
) && adrp_offset
)
2074 = reinterpret_cast<Insntype
*>(pview
.view
+ adrp_offset
- 4);
2075 Insntype prev_insn
= prev_view
[0];
2077 if (Insn_utilities::is_mrs_tpidr_el0(prev_insn
))
2081 /* If we reach here, the first instruction must be ADRP. */
2082 gold_assert(Insn_utilities::is_adrp(adrp_insn
));
2083 // Get adrp 33-bit signed imm value.
2084 int64_t adrp_imm
= Insn_utilities::
2085 aarch64_adrp_decode_imm(adrp_insn
);
2086 // adrp - final value transferred to target register is calculated as:
2087 // PC[11:0] = Zeros(12)
2088 // adrp_dest_value = PC + adrp_imm;
2089 int64_t adrp_dest_value
= (pc
& ~((1 << 12) - 1)) + adrp_imm
;
2090 // adr -final value transferred to target register is calucalted as:
2093 // PC + adr_imm = adrp_dest_value
2095 // adr_imm = adrp_dest_value - PC
2096 int64_t adr_imm
= adrp_dest_value
- pc
;
2097 // Check if imm fits in adr (21-bit signed).
2098 if (-(1 << 20) <= adr_imm
&& adr_imm
< (1 << 20))
2100 // Convert 'adrp' into 'adr'.
2101 Insntype adr_insn
= adrp_insn
& ((1u << 31) - 1);
2102 adr_insn
= Insn_utilities::
2103 aarch64_adr_encode_imm(adr_insn
, adr_imm
);
2104 elfcpp::Swap
<32, big_endian
>::writeval(adrp_view
, adr_insn
);
2111 // Relocate sections.
2113 template<int size
, bool big_endian
>
2115 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
2116 const Symbol_table
* symtab
, const Layout
* layout
,
2117 const unsigned char* pshdrs
, Output_file
* of
,
2118 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
2120 // Relocate the section data.
2121 this->relocate_section_range(symtab
, layout
, pshdrs
, of
, pviews
,
2122 1, this->shnum() - 1);
2124 // We do not generate stubs if doing a relocatable link.
2125 if (parameters
->options().relocatable())
2128 // This part only relocates erratum stubs that belong to input sections of this
2130 if (parameters
->options().fix_cortex_a53_843419()
2131 || parameters
->options().fix_cortex_a53_835769())
2132 this->fix_errata_and_relocate_erratum_stubs(pviews
);
2134 Relocate_info
<size
, big_endian
> relinfo
;
2135 relinfo
.symtab
= symtab
;
2136 relinfo
.layout
= layout
;
2137 relinfo
.object
= this;
2139 // This part relocates all reloc stubs that are contained in stub_tables of
2140 // this object file.
2141 unsigned int shnum
= this->shnum();
2142 The_target_aarch64
* target
= The_target_aarch64::current_target();
2144 for (unsigned int i
= 1; i
< shnum
; ++i
)
2146 The_aarch64_input_section
* aarch64_input_section
=
2147 target
->find_aarch64_input_section(this, i
);
2148 if (aarch64_input_section
!= NULL
2149 && aarch64_input_section
->is_stub_table_owner()
2150 && !aarch64_input_section
->stub_table()->empty())
2152 Output_section
* os
= this->output_section(i
);
2153 gold_assert(os
!= NULL
);
2155 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
2156 relinfo
.reloc_shdr
= NULL
;
2157 relinfo
.data_shndx
= i
;
2158 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
2160 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2161 view_struct
= (*pviews
)[i
];
2162 gold_assert(view_struct
.view
!= NULL
);
2164 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
2165 off_t offset
= stub_table
->address() - view_struct
.address
;
2166 unsigned char* view
= view_struct
.view
+ offset
;
2167 AArch64_address address
= stub_table
->address();
2168 section_size_type view_size
= stub_table
->data_size();
2169 stub_table
->relocate_reloc_stubs(&relinfo
, target
, os
, view
, address
,
2176 // Determine if an input section is scannable for stub processing. SHDR is
2177 // the header of the section and SHNDX is the section index. OS is the output
2178 // section for the input section and SYMTAB is the global symbol table used to
2179 // look up ICF information.
2181 template<int size
, bool big_endian
>
2183 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
2184 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
2185 unsigned int text_shndx
,
2186 const Output_section
* os
,
2187 const Symbol_table
* symtab
)
2189 // Skip any empty sections, unallocated sections or sections whose
2190 // type are not SHT_PROGBITS.
2191 if (text_shdr
.get_sh_size() == 0
2192 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
2193 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2196 // Skip any discarded or ICF'ed sections.
2197 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
2200 // Skip exception frame.
2201 if (strcmp(os
->name(), ".eh_frame") == 0)
2204 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
2205 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2211 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2212 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2214 template<int size
, bool big_endian
>
2216 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2217 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2218 const Relobj::Output_sections
& out_sections
,
2219 const Symbol_table
* symtab
,
2220 const unsigned char* pshdrs
)
2222 unsigned int sh_type
= shdr
.get_sh_type();
2223 if (sh_type
!= elfcpp::SHT_RELA
)
2226 // Ignore empty section.
2227 off_t sh_size
= shdr
.get_sh_size();
2231 // Ignore reloc section with unexpected symbol table. The
2232 // error will be reported in the final link.
2233 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2236 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2237 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2239 // Ignore reloc section with unexpected entsize or uneven size.
2240 // The error will be reported in the final link.
2241 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2244 // Ignore reloc section with bad info. This error will be
2245 // reported in the final link.
2246 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2247 if (text_shndx
>= this->shnum())
2250 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2251 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2252 text_shndx
* shdr_size
);
2253 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2254 out_sections
[text_shndx
], symtab
);
2258 // Scan section SHNDX for erratum 843419 and 835769.
2260 template<int size
, bool big_endian
>
2262 AArch64_relobj
<size
, big_endian
>::scan_errata(
2263 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2264 Output_section
* os
, const Symbol_table
* symtab
,
2265 The_target_aarch64
* target
)
2267 if (shdr
.get_sh_size() == 0
2268 || (shdr
.get_sh_flags() &
2269 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2270 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2273 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2275 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2276 AArch64_address output_address
;
2277 if (output_offset
!= invalid_address
)
2278 output_address
= os
->address() + output_offset
;
2281 const Output_relaxed_input_section
* poris
=
2282 os
->find_relaxed_input_section(this, shndx
);
2284 output_address
= poris
->address();
2287 section_size_type input_view_size
= 0;
2288 const unsigned char* input_view
=
2289 this->section_contents(shndx
, &input_view_size
, false);
2291 Mapping_symbol_position
section_start(shndx
, 0);
2292 // Find the first mapping symbol record within section shndx.
2293 typename
Mapping_symbol_info::const_iterator p
=
2294 this->mapping_symbol_info_
.lower_bound(section_start
);
2295 while (p
!= this->mapping_symbol_info_
.end() &&
2296 p
->first
.shndx_
== shndx
)
2298 typename
Mapping_symbol_info::const_iterator prev
= p
;
2300 if (prev
->second
== 'x')
2302 section_size_type span_start
=
2303 convert_to_section_size_type(prev
->first
.offset_
);
2304 section_size_type span_end
;
2305 if (p
!= this->mapping_symbol_info_
.end()
2306 && p
->first
.shndx_
== shndx
)
2307 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2309 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2311 // Here we do not share the scanning code of both errata. For 843419,
2312 // only the last few insns of each page are examined, which is fast,
2313 // whereas, for 835769, every insn pair needs to be checked.
2315 if (parameters
->options().fix_cortex_a53_843419())
2316 target
->scan_erratum_843419_span(
2317 this, shndx
, span_start
, span_end
,
2318 const_cast<unsigned char*>(input_view
), output_address
);
2320 if (parameters
->options().fix_cortex_a53_835769())
2321 target
->scan_erratum_835769_span(
2322 this, shndx
, span_start
, span_end
,
2323 const_cast<unsigned char*>(input_view
), output_address
);
2329 // Scan relocations for stub generation.
2331 template<int size
, bool big_endian
>
2333 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2334 The_target_aarch64
* target
,
2335 const Symbol_table
* symtab
,
2336 const Layout
* layout
)
2338 unsigned int shnum
= this->shnum();
2339 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2341 // Read the section headers.
2342 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2346 // To speed up processing, we set up hash tables for fast lookup of
2347 // input offsets to output addresses.
2348 this->initialize_input_to_output_maps();
2350 const Relobj::Output_sections
& out_sections(this->output_sections());
2352 Relocate_info
<size
, big_endian
> relinfo
;
2353 relinfo
.symtab
= symtab
;
2354 relinfo
.layout
= layout
;
2355 relinfo
.object
= this;
2357 // Do relocation stubs scanning.
2358 const unsigned char* p
= pshdrs
+ shdr_size
;
2359 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2361 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2362 if (parameters
->options().fix_cortex_a53_843419()
2363 || parameters
->options().fix_cortex_a53_835769())
2364 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2365 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2368 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2369 AArch64_address output_offset
=
2370 this->get_output_section_offset(index
);
2371 AArch64_address output_address
;
2372 if (output_offset
!= invalid_address
)
2374 output_address
= out_sections
[index
]->address() + output_offset
;
2378 // Currently this only happens for a relaxed section.
2379 const Output_relaxed_input_section
* poris
=
2380 out_sections
[index
]->find_relaxed_input_section(this, index
);
2381 gold_assert(poris
!= NULL
);
2382 output_address
= poris
->address();
2385 // Get the relocations.
2386 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2390 // Get the section contents.
2391 section_size_type input_view_size
= 0;
2392 const unsigned char* input_view
=
2393 this->section_contents(index
, &input_view_size
, false);
2395 relinfo
.reloc_shndx
= i
;
2396 relinfo
.data_shndx
= index
;
2397 unsigned int sh_type
= shdr
.get_sh_type();
2398 unsigned int reloc_size
;
2399 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2400 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2402 Output_section
* os
= out_sections
[index
];
2403 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2404 shdr
.get_sh_size() / reloc_size
,
2406 output_offset
== invalid_address
,
2407 input_view
, output_address
,
2414 // A class to wrap an ordinary input section containing executable code.
2416 template<int size
, bool big_endian
>
2417 class AArch64_input_section
: public Output_relaxed_input_section
2420 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2422 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2423 : Output_relaxed_input_section(relobj
, shndx
, 1),
2425 original_contents_(NULL
), original_size_(0),
2426 original_addralign_(1)
2429 ~AArch64_input_section()
2430 { delete[] this->original_contents_
; }
2436 // Set the stub_table.
2438 set_stub_table(The_stub_table
* st
)
2439 { this->stub_table_
= st
; }
2441 // Whether this is a stub table owner.
2443 is_stub_table_owner() const
2444 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2446 // Return the original size of the section.
2448 original_size() const
2449 { return this->original_size_
; }
2451 // Return the stub table.
2454 { return stub_table_
; }
2457 // Write out this input section.
2459 do_write(Output_file
*);
2461 // Return required alignment of this.
2463 do_addralign() const
2465 if (this->is_stub_table_owner())
2466 return std::max(this->stub_table_
->addralign(),
2467 static_cast<uint64_t>(this->original_addralign_
));
2469 return this->original_addralign_
;
2472 // Finalize data size.
2474 set_final_data_size();
2476 // Reset address and file offset.
2478 do_reset_address_and_file_offset();
2482 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2483 section_offset_type offset
,
2484 section_offset_type
* poutput
) const
2486 if ((object
== this->relobj())
2487 && (shndx
== this->shndx())
2490 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2500 // Copying is not allowed.
2501 AArch64_input_section(const AArch64_input_section
&);
2502 AArch64_input_section
& operator=(const AArch64_input_section
&);
2504 // The relocation stubs.
2505 The_stub_table
* stub_table_
;
2506 // Original section contents. We have to make a copy here since the file
2507 // containing the original section may not be locked when we need to access
2509 unsigned char* original_contents_
;
2510 // Section size of the original input section.
2511 uint32_t original_size_
;
2512 // Address alignment of the original input section.
2513 uint32_t original_addralign_
;
2514 }; // End of AArch64_input_section
2517 // Finalize data size.
2519 template<int size
, bool big_endian
>
2521 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2523 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2525 if (this->is_stub_table_owner())
2527 this->stub_table_
->finalize_data_size();
2528 off
= align_address(off
, this->stub_table_
->addralign());
2529 off
+= this->stub_table_
->data_size();
2531 this->set_data_size(off
);
2535 // Reset address and file offset.
2537 template<int size
, bool big_endian
>
2539 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2541 // Size of the original input section contents.
2542 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2544 // If this is a stub table owner, account for the stub table size.
2545 if (this->is_stub_table_owner())
2547 The_stub_table
* stub_table
= this->stub_table_
;
2549 // Reset the stub table's address and file offset. The
2550 // current data size for child will be updated after that.
2551 stub_table_
->reset_address_and_file_offset();
2552 off
= align_address(off
, stub_table_
->addralign());
2553 off
+= stub_table
->current_data_size();
2556 this->set_current_data_size(off
);
2560 // Initialize an Arm_input_section.
2562 template<int size
, bool big_endian
>
2564 AArch64_input_section
<size
, big_endian
>::init()
2566 Relobj
* relobj
= this->relobj();
2567 unsigned int shndx
= this->shndx();
2569 // We have to cache original size, alignment and contents to avoid locking
2570 // the original file.
2571 this->original_addralign_
=
2572 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2574 // This is not efficient but we expect only a small number of relaxed
2575 // input sections for stubs.
2576 section_size_type section_size
;
2577 const unsigned char* section_contents
=
2578 relobj
->section_contents(shndx
, §ion_size
, false);
2579 this->original_size_
=
2580 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2582 gold_assert(this->original_contents_
== NULL
);
2583 this->original_contents_
= new unsigned char[section_size
];
2584 memcpy(this->original_contents_
, section_contents
, section_size
);
2586 // We want to make this look like the original input section after
2587 // output sections are finalized.
2588 Output_section
* os
= relobj
->output_section(shndx
);
2589 off_t offset
= relobj
->output_section_offset(shndx
);
2590 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2591 this->set_address(os
->address() + offset
);
2592 this->set_file_offset(os
->offset() + offset
);
2593 this->set_current_data_size(this->original_size_
);
2594 this->finalize_data_size();
2598 // Write data to output file.
2600 template<int size
, bool big_endian
>
2602 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2604 // We have to write out the original section content.
2605 gold_assert(this->original_contents_
!= NULL
);
2606 of
->write(this->offset(), this->original_contents_
,
2607 this->original_size_
);
2609 // If this owns a stub table and it is not empty, write it.
2610 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2611 this->stub_table_
->write(of
);
2615 // Arm output section class. This is defined mainly to add a number of stub
2616 // generation methods.
2618 template<int size
, bool big_endian
>
2619 class AArch64_output_section
: public Output_section
2622 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2623 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2624 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2625 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2628 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2629 elfcpp::Elf_Xword flags
)
2630 : Output_section(name
, type
, flags
)
2633 ~AArch64_output_section() {}
2635 // Group input sections for stub generation.
2637 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2641 typedef Output_section::Input_section Input_section
;
2642 typedef Output_section::Input_section_list Input_section_list
;
2644 // Create a stub group.
2646 create_stub_group(Input_section_list::const_iterator
,
2647 Input_section_list::const_iterator
,
2648 Input_section_list::const_iterator
,
2649 The_target_aarch64
*,
2650 std::vector
<Output_relaxed_input_section
*>&,
2652 }; // End of AArch64_output_section
2655 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2656 // the input section that will be the owner of the stub table.
2658 template<int size
, bool big_endian
> void
2659 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2660 Input_section_list::const_iterator first
,
2661 Input_section_list::const_iterator last
,
2662 Input_section_list::const_iterator owner
,
2663 The_target_aarch64
* target
,
2664 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2667 // Currently we convert ordinary input sections into relaxed sections only
2669 The_aarch64_input_section
* input_section
;
2670 if (owner
->is_relaxed_input_section())
2674 gold_assert(owner
->is_input_section());
2675 // Create a new relaxed input section. We need to lock the original
2677 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2679 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2680 new_relaxed_sections
.push_back(input_section
);
2683 // Create a stub table.
2684 The_stub_table
* stub_table
=
2685 target
->new_stub_table(input_section
);
2687 input_section
->set_stub_table(stub_table
);
2689 Input_section_list::const_iterator p
= first
;
2690 // Look for input sections or relaxed input sections in [first ... last].
2693 if (p
->is_input_section() || p
->is_relaxed_input_section())
2695 // The stub table information for input sections live
2696 // in their objects.
2697 The_aarch64_relobj
* aarch64_relobj
=
2698 static_cast<The_aarch64_relobj
*>(p
->relobj());
2699 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2702 while (p
++ != last
);
2706 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2707 // stub groups. We grow a stub group by adding input section until the size is
2708 // just below GROUP_SIZE. The last input section will be converted into a stub
2709 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2710 // after the stub table, effectively doubling the group size.
2712 // This is similar to the group_sections() function in elf32-arm.c but is
2713 // implemented differently.
2715 template<int size
, bool big_endian
>
2716 void AArch64_output_section
<size
, big_endian
>::group_sections(
2717 section_size_type group_size
,
2718 bool stubs_always_after_branch
,
2719 Target_aarch64
<size
, big_endian
>* target
,
2725 FINDING_STUB_SECTION
,
2729 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2731 State state
= NO_GROUP
;
2732 section_size_type off
= 0;
2733 section_size_type group_begin_offset
= 0;
2734 section_size_type group_end_offset
= 0;
2735 section_size_type stub_table_end_offset
= 0;
2736 Input_section_list::const_iterator group_begin
=
2737 this->input_sections().end();
2738 Input_section_list::const_iterator stub_table
=
2739 this->input_sections().end();
2740 Input_section_list::const_iterator group_end
= this->input_sections().end();
2741 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2742 p
!= this->input_sections().end();
2745 section_size_type section_begin_offset
=
2746 align_address(off
, p
->addralign());
2747 section_size_type section_end_offset
=
2748 section_begin_offset
+ p
->data_size();
2750 // Check to see if we should group the previously seen sections.
2756 case FINDING_STUB_SECTION
:
2757 // Adding this section makes the group larger than GROUP_SIZE.
2758 if (section_end_offset
- group_begin_offset
>= group_size
)
2760 if (stubs_always_after_branch
)
2762 gold_assert(group_end
!= this->input_sections().end());
2763 this->create_stub_group(group_begin
, group_end
, group_end
,
2764 target
, new_relaxed_sections
,
2770 // Input sections up to stub_group_size bytes after the stub
2771 // table can be handled by it too.
2772 state
= HAS_STUB_SECTION
;
2773 stub_table
= group_end
;
2774 stub_table_end_offset
= group_end_offset
;
2779 case HAS_STUB_SECTION
:
2780 // Adding this section makes the post stub-section group larger
2783 // NOT SUPPORTED YET. For completeness only.
2784 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2786 gold_assert(group_end
!= this->input_sections().end());
2787 this->create_stub_group(group_begin
, group_end
, stub_table
,
2788 target
, new_relaxed_sections
, task
);
2797 // If we see an input section and currently there is no group, start
2798 // a new one. Skip any empty sections. We look at the data size
2799 // instead of calling p->relobj()->section_size() to avoid locking.
2800 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2801 && (p
->data_size() != 0))
2803 if (state
== NO_GROUP
)
2805 state
= FINDING_STUB_SECTION
;
2807 group_begin_offset
= section_begin_offset
;
2810 // Keep track of the last input section seen.
2812 group_end_offset
= section_end_offset
;
2815 off
= section_end_offset
;
2818 // Create a stub group for any ungrouped sections.
2819 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2821 gold_assert(group_end
!= this->input_sections().end());
2822 this->create_stub_group(group_begin
, group_end
,
2823 (state
== FINDING_STUB_SECTION
2826 target
, new_relaxed_sections
, task
);
2829 if (!new_relaxed_sections
.empty())
2830 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2832 // Update the section offsets
2833 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2835 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2836 new_relaxed_sections
[i
]->relobj());
2837 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2838 // Tell AArch64_relobj that this input section is converted.
2839 relobj
->convert_input_section_to_relaxed_section(shndx
);
2841 } // End of AArch64_output_section::group_sections
2844 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2847 // The aarch64 target class.
2849 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2850 template<int size
, bool big_endian
>
2851 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2854 typedef Target_aarch64
<size
, big_endian
> This
;
2855 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2857 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2858 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2859 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2860 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2861 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2862 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2863 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2864 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2865 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2866 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2867 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2868 typedef Unordered_map
<Section_id
,
2869 AArch64_input_section
<size
, big_endian
>*,
2870 Section_id_hash
> AArch64_input_section_map
;
2871 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2872 const static int TCB_SIZE
= size
/ 8 * 2;
2874 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2875 : Sized_target
<size
, big_endian
>(info
),
2876 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2877 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2878 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2879 got_mod_index_offset_(-1U),
2880 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2881 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2884 // Scan the relocations to determine unreferenced sections for
2885 // garbage collection.
2887 gc_process_relocs(Symbol_table
* symtab
,
2889 Sized_relobj_file
<size
, big_endian
>* object
,
2890 unsigned int data_shndx
,
2891 unsigned int sh_type
,
2892 const unsigned char* prelocs
,
2894 Output_section
* output_section
,
2895 bool needs_special_offset_handling
,
2896 size_t local_symbol_count
,
2897 const unsigned char* plocal_symbols
);
2899 // Scan the relocations to look for symbol adjustments.
2901 scan_relocs(Symbol_table
* symtab
,
2903 Sized_relobj_file
<size
, big_endian
>* object
,
2904 unsigned int data_shndx
,
2905 unsigned int sh_type
,
2906 const unsigned char* prelocs
,
2908 Output_section
* output_section
,
2909 bool needs_special_offset_handling
,
2910 size_t local_symbol_count
,
2911 const unsigned char* plocal_symbols
);
2913 // Finalize the sections.
2915 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2917 // Return the value to use for a dynamic which requires special
2920 do_dynsym_value(const Symbol
*) const;
2922 // Relocate a section.
2924 relocate_section(const Relocate_info
<size
, big_endian
>*,
2925 unsigned int sh_type
,
2926 const unsigned char* prelocs
,
2928 Output_section
* output_section
,
2929 bool needs_special_offset_handling
,
2930 unsigned char* view
,
2931 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2932 section_size_type view_size
,
2933 const Reloc_symbol_changes
*);
2935 // Scan the relocs during a relocatable link.
2937 scan_relocatable_relocs(Symbol_table
* symtab
,
2939 Sized_relobj_file
<size
, big_endian
>* object
,
2940 unsigned int data_shndx
,
2941 unsigned int sh_type
,
2942 const unsigned char* prelocs
,
2944 Output_section
* output_section
,
2945 bool needs_special_offset_handling
,
2946 size_t local_symbol_count
,
2947 const unsigned char* plocal_symbols
,
2948 Relocatable_relocs
*);
2950 // Scan the relocs for --emit-relocs.
2952 emit_relocs_scan(Symbol_table
* symtab
,
2954 Sized_relobj_file
<size
, big_endian
>* object
,
2955 unsigned int data_shndx
,
2956 unsigned int sh_type
,
2957 const unsigned char* prelocs
,
2959 Output_section
* output_section
,
2960 bool needs_special_offset_handling
,
2961 size_t local_symbol_count
,
2962 const unsigned char* plocal_syms
,
2963 Relocatable_relocs
* rr
);
2965 // Relocate a section during a relocatable link.
2968 const Relocate_info
<size
, big_endian
>*,
2969 unsigned int sh_type
,
2970 const unsigned char* prelocs
,
2972 Output_section
* output_section
,
2973 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
2974 unsigned char* view
,
2975 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2976 section_size_type view_size
,
2977 unsigned char* reloc_view
,
2978 section_size_type reloc_view_size
);
2980 // Return the symbol index to use for a target specific relocation.
2981 // The only target specific relocation is R_AARCH64_TLSDESC for a
2982 // local symbol, which is an absolute reloc.
2984 do_reloc_symbol_index(void*, unsigned int r_type
) const
2986 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
2990 // Return the addend to use for a target specific relocation.
2992 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
2994 // Return the PLT section.
2996 do_plt_address_for_global(const Symbol
* gsym
) const
2997 { return this->plt_section()->address_for_global(gsym
); }
3000 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
3001 { return this->plt_section()->address_for_local(relobj
, symndx
); }
3003 // This function should be defined in targets that can use relocation
3004 // types to determine (implemented in local_reloc_may_be_function_pointer
3005 // and global_reloc_may_be_function_pointer)
3006 // if a function's pointer is taken. ICF uses this in safe mode to only
3007 // fold those functions whose pointer is defintely not taken.
3009 do_can_check_for_function_pointers() const
3012 // Return the number of entries in the PLT.
3014 plt_entry_count() const;
3016 //Return the offset of the first non-reserved PLT entry.
3018 first_plt_entry_offset() const;
3020 // Return the size of each PLT entry.
3022 plt_entry_size() const;
3024 // Create a stub table.
3026 new_stub_table(The_aarch64_input_section
*);
3028 // Create an aarch64 input section.
3029 The_aarch64_input_section
*
3030 new_aarch64_input_section(Relobj
*, unsigned int);
3032 // Find an aarch64 input section instance for a given OBJ and SHNDX.
3033 The_aarch64_input_section
*
3034 find_aarch64_input_section(Relobj
*, unsigned int) const;
3036 // Return the thread control block size.
3038 tcb_size() const { return This::TCB_SIZE
; }
3040 // Scan a section for stub generation.
3042 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
3043 const unsigned char*, size_t, Output_section
*,
3044 bool, const unsigned char*,
3048 // Scan a relocation section for stub.
3049 template<int sh_type
>
3051 scan_reloc_section_for_stubs(
3052 const The_relocate_info
* relinfo
,
3053 const unsigned char* prelocs
,
3055 Output_section
* output_section
,
3056 bool needs_special_offset_handling
,
3057 const unsigned char* view
,
3058 Address view_address
,
3061 // Relocate a single reloc stub.
3063 relocate_reloc_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
3064 Output_section
*, unsigned char*, Address
,
3067 // Get the default AArch64 target.
3071 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
3072 && parameters
->target().get_size() == size
3073 && parameters
->target().is_big_endian() == big_endian
);
3074 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
3078 // Scan erratum 843419 for a part of a section.
3080 scan_erratum_843419_span(
3081 AArch64_relobj
<size
, big_endian
>*,
3083 const section_size_type
,
3084 const section_size_type
,
3088 // Scan erratum 835769 for a part of a section.
3090 scan_erratum_835769_span(
3091 AArch64_relobj
<size
, big_endian
>*,
3093 const section_size_type
,
3094 const section_size_type
,
3100 do_select_as_default_target()
3102 gold_assert(aarch64_reloc_property_table
== NULL
);
3103 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
3106 // Add a new reloc argument, returning the index in the vector.
3108 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
3111 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
3112 return this->tlsdesc_reloc_info_
.size() - 1;
3115 virtual Output_data_plt_aarch64
<size
, big_endian
>*
3116 do_make_data_plt(Layout
* layout
,
3117 Output_data_got_aarch64
<size
, big_endian
>* got
,
3118 Output_data_space
* got_plt
,
3119 Output_data_space
* got_irelative
)
3121 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
3122 layout
, got
, got_plt
, got_irelative
);
3126 // do_make_elf_object to override the same function in the base class.
3128 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
3129 const elfcpp::Ehdr
<size
, big_endian
>&);
3131 Output_data_plt_aarch64
<size
, big_endian
>*
3132 make_data_plt(Layout
* layout
,
3133 Output_data_got_aarch64
<size
, big_endian
>* got
,
3134 Output_data_space
* got_plt
,
3135 Output_data_space
* got_irelative
)
3137 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
3140 // We only need to generate stubs, and hence perform relaxation if we are
3141 // not doing relocatable linking.
3143 do_may_relax() const
3144 { return !parameters
->options().relocatable(); }
3146 // Relaxation hook. This is where we do stub generation.
3148 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
3151 group_sections(Layout
* layout
,
3152 section_size_type group_size
,
3153 bool stubs_always_after_branch
,
3157 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
3158 const Sized_symbol
<size
>*, unsigned int,
3159 const Symbol_value
<size
>*,
3160 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
3163 // Make an output section.
3165 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
3166 elfcpp::Elf_Xword flags
)
3167 { return new The_aarch64_output_section(name
, type
, flags
); }
3170 // The class which scans relocations.
3175 : issued_non_pic_error_(false)
3179 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3180 Sized_relobj_file
<size
, big_endian
>* object
,
3181 unsigned int data_shndx
,
3182 Output_section
* output_section
,
3183 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3184 const elfcpp::Sym
<size
, big_endian
>& lsym
,
3188 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3189 Sized_relobj_file
<size
, big_endian
>* object
,
3190 unsigned int data_shndx
,
3191 Output_section
* output_section
,
3192 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3196 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3197 Target_aarch64
<size
, big_endian
>* ,
3198 Sized_relobj_file
<size
, big_endian
>* ,
3201 const elfcpp::Rela
<size
, big_endian
>& ,
3202 unsigned int r_type
,
3203 const elfcpp::Sym
<size
, big_endian
>&);
3206 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3207 Target_aarch64
<size
, big_endian
>* ,
3208 Sized_relobj_file
<size
, big_endian
>* ,
3211 const elfcpp::Rela
<size
, big_endian
>& ,
3212 unsigned int r_type
,
3217 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3218 unsigned int r_type
);
3221 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3222 unsigned int r_type
, Symbol
*);
3225 possible_function_pointer_reloc(unsigned int r_type
);
3228 check_non_pic(Relobj
*, unsigned int r_type
);
3231 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3232 unsigned int r_type
);
3234 // Whether we have issued an error about a non-PIC compilation.
3235 bool issued_non_pic_error_
;
3238 // The class which implements relocation.
3243 : skip_call_tls_get_addr_(false)
3249 // Do a relocation. Return false if the caller should not issue
3250 // any warnings about this relocation.
3252 relocate(const Relocate_info
<size
, big_endian
>*, unsigned int,
3253 Target_aarch64
*, Output_section
*, size_t, const unsigned char*,
3254 const Sized_symbol
<size
>*, const Symbol_value
<size
>*,
3255 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3259 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3260 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3261 Target_aarch64
<size
, big_endian
>*,
3263 const elfcpp::Rela
<size
, big_endian
>&,
3264 unsigned int r_type
, const Sized_symbol
<size
>*,
3265 const Symbol_value
<size
>*,
3267 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3269 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3271 const Relocate_info
<size
, big_endian
>*,
3272 Target_aarch64
<size
, big_endian
>*,
3273 const elfcpp::Rela
<size
, big_endian
>&,
3276 const Symbol_value
<size
>*);
3278 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3280 const Relocate_info
<size
, big_endian
>*,
3281 Target_aarch64
<size
, big_endian
>*,
3282 const elfcpp::Rela
<size
, big_endian
>&,
3285 const Symbol_value
<size
>*);
3287 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3289 const Relocate_info
<size
, big_endian
>*,
3290 Target_aarch64
<size
, big_endian
>*,
3291 const elfcpp::Rela
<size
, big_endian
>&,
3294 const Symbol_value
<size
>*);
3296 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3298 const Relocate_info
<size
, big_endian
>*,
3299 Target_aarch64
<size
, big_endian
>*,
3300 const elfcpp::Rela
<size
, big_endian
>&,
3303 const Symbol_value
<size
>*);
3305 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3307 const Relocate_info
<size
, big_endian
>*,
3308 Target_aarch64
<size
, big_endian
>*,
3309 const elfcpp::Rela
<size
, big_endian
>&,
3312 const Symbol_value
<size
>*,
3313 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3314 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3316 bool skip_call_tls_get_addr_
;
3318 }; // End of class Relocate
3320 // Adjust TLS relocation type based on the options and whether this
3321 // is a local symbol.
3322 static tls::Tls_optimization
3323 optimize_tls_reloc(bool is_final
, int r_type
);
3325 // Get the GOT section, creating it if necessary.
3326 Output_data_got_aarch64
<size
, big_endian
>*
3327 got_section(Symbol_table
*, Layout
*);
3329 // Get the GOT PLT section.
3331 got_plt_section() const
3333 gold_assert(this->got_plt_
!= NULL
);
3334 return this->got_plt_
;
3337 // Get the GOT section for TLSDESC entries.
3338 Output_data_got
<size
, big_endian
>*
3339 got_tlsdesc_section() const
3341 gold_assert(this->got_tlsdesc_
!= NULL
);
3342 return this->got_tlsdesc_
;
3345 // Create the PLT section.
3347 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3349 // Create a PLT entry for a global symbol.
3351 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3353 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3355 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3356 Sized_relobj_file
<size
, big_endian
>* relobj
,
3357 unsigned int local_sym_index
);
3359 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3361 define_tls_base_symbol(Symbol_table
*, Layout
*);
3363 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3365 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3367 // Create a GOT entry for the TLS module index.
3369 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3370 Sized_relobj_file
<size
, big_endian
>* object
);
3372 // Get the PLT section.
3373 Output_data_plt_aarch64
<size
, big_endian
>*
3376 gold_assert(this->plt_
!= NULL
);
3380 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3381 // ST_E_843419, we need an additional field for adrp offset.
3382 void create_erratum_stub(
3383 AArch64_relobj
<size
, big_endian
>* relobj
,
3385 section_size_type erratum_insn_offset
,
3386 Address erratum_address
,
3387 typename
Insn_utilities::Insntype erratum_insn
,
3389 unsigned int e843419_adrp_offset
=0);
3391 // Return whether this is a 3-insn erratum sequence.
3392 bool is_erratum_843419_sequence(
3393 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3394 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3395 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3397 // Return whether this is a 835769 sequence.
3398 // (Similarly implemented as in elfnn-aarch64.c.)
3399 bool is_erratum_835769_sequence(
3400 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3401 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3403 // Get the dynamic reloc section, creating it if necessary.
3405 rela_dyn_section(Layout
*);
3407 // Get the section to use for TLSDESC relocations.
3409 rela_tlsdesc_section(Layout
*) const;
3411 // Get the section to use for IRELATIVE relocations.
3413 rela_irelative_section(Layout
*);
3415 // Add a potential copy relocation.
3417 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3418 Sized_relobj_file
<size
, big_endian
>* object
,
3419 unsigned int shndx
, Output_section
* output_section
,
3420 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3422 unsigned int r_type
= elfcpp::elf_r_type
<size
>(reloc
.get_r_info());
3423 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3424 symtab
->get_sized_symbol
<size
>(sym
),
3425 object
, shndx
, output_section
,
3426 r_type
, reloc
.get_r_offset(),
3427 reloc
.get_r_addend(),
3428 this->rela_dyn_section(layout
));
3431 // Information about this specific target which we pass to the
3432 // general Target structure.
3433 static const Target::Target_info aarch64_info
;
3435 // The types of GOT entries needed for this platform.
3436 // These values are exposed to the ABI in an incremental link.
3437 // Do not renumber existing values without changing the version
3438 // number of the .gnu_incremental_inputs section.
3441 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3442 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3443 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3444 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3447 // This type is used as the argument to the target specific
3448 // relocation routines. The only target specific reloc is
3449 // R_AARCh64_TLSDESC against a local symbol.
3452 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3453 unsigned int a_r_sym
)
3454 : object(a_object
), r_sym(a_r_sym
)
3457 // The object in which the local symbol is defined.
3458 Sized_relobj_file
<size
, big_endian
>* object
;
3459 // The local symbol index in the object.
3464 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3466 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3467 // The GOT PLT section.
3468 Output_data_space
* got_plt_
;
3469 // The GOT section for IRELATIVE relocations.
3470 Output_data_space
* got_irelative_
;
3471 // The GOT section for TLSDESC relocations.
3472 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3473 // The _GLOBAL_OFFSET_TABLE_ symbol.
3474 Symbol
* global_offset_table_
;
3475 // The dynamic reloc section.
3476 Reloc_section
* rela_dyn_
;
3477 // The section to use for IRELATIVE relocs.
3478 Reloc_section
* rela_irelative_
;
3479 // Relocs saved to avoid a COPY reloc.
3480 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3481 // Offset of the GOT entry for the TLS module index.
3482 unsigned int got_mod_index_offset_
;
3483 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3484 // specific relocation. Here we store the object and local symbol
3485 // index for the relocation.
3486 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3487 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3488 bool tls_base_symbol_defined_
;
3489 // List of stub_tables
3490 Stub_table_list stub_tables_
;
3491 // Actual stub group size
3492 section_size_type stub_group_size_
;
3493 AArch64_input_section_map aarch64_input_section_map_
;
3494 }; // End of Target_aarch64
3498 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3501 false, // is_big_endian
3502 elfcpp::EM_AARCH64
, // machine_code
3503 false, // has_make_symbol
3504 false, // has_resolve
3505 false, // has_code_fill
3506 true, // is_default_stack_executable
3507 true, // can_icf_inline_merge_sections
3509 "/lib/ld.so.1", // program interpreter
3510 0x400000, // default_text_segment_address
3511 0x10000, // abi_pagesize (overridable by -z max-page-size)
3512 0x1000, // common_pagesize (overridable by -z common-page-size)
3513 false, // isolate_execinstr
3515 elfcpp::SHN_UNDEF
, // small_common_shndx
3516 elfcpp::SHN_UNDEF
, // large_common_shndx
3517 0, // small_common_section_flags
3518 0, // large_common_section_flags
3519 NULL
, // attributes_section
3520 NULL
, // attributes_vendor
3521 "_start", // entry_symbol_name
3522 32, // hash_entry_size
3526 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3529 false, // is_big_endian
3530 elfcpp::EM_AARCH64
, // machine_code
3531 false, // has_make_symbol
3532 false, // has_resolve
3533 false, // has_code_fill
3534 true, // is_default_stack_executable
3535 false, // can_icf_inline_merge_sections
3537 "/lib/ld.so.1", // program interpreter
3538 0x400000, // default_text_segment_address
3539 0x10000, // abi_pagesize (overridable by -z max-page-size)
3540 0x1000, // common_pagesize (overridable by -z common-page-size)
3541 false, // isolate_execinstr
3543 elfcpp::SHN_UNDEF
, // small_common_shndx
3544 elfcpp::SHN_UNDEF
, // large_common_shndx
3545 0, // small_common_section_flags
3546 0, // large_common_section_flags
3547 NULL
, // attributes_section
3548 NULL
, // attributes_vendor
3549 "_start", // entry_symbol_name
3550 32, // hash_entry_size
3554 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3557 true, // is_big_endian
3558 elfcpp::EM_AARCH64
, // machine_code
3559 false, // has_make_symbol
3560 false, // has_resolve
3561 false, // has_code_fill
3562 true, // is_default_stack_executable
3563 true, // can_icf_inline_merge_sections
3565 "/lib/ld.so.1", // program interpreter
3566 0x400000, // default_text_segment_address
3567 0x10000, // abi_pagesize (overridable by -z max-page-size)
3568 0x1000, // common_pagesize (overridable by -z common-page-size)
3569 false, // isolate_execinstr
3571 elfcpp::SHN_UNDEF
, // small_common_shndx
3572 elfcpp::SHN_UNDEF
, // large_common_shndx
3573 0, // small_common_section_flags
3574 0, // large_common_section_flags
3575 NULL
, // attributes_section
3576 NULL
, // attributes_vendor
3577 "_start", // entry_symbol_name
3578 32, // hash_entry_size
3582 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3585 true, // is_big_endian
3586 elfcpp::EM_AARCH64
, // machine_code
3587 false, // has_make_symbol
3588 false, // has_resolve
3589 false, // has_code_fill
3590 true, // is_default_stack_executable
3591 false, // can_icf_inline_merge_sections
3593 "/lib/ld.so.1", // program interpreter
3594 0x400000, // default_text_segment_address
3595 0x10000, // abi_pagesize (overridable by -z max-page-size)
3596 0x1000, // common_pagesize (overridable by -z common-page-size)
3597 false, // isolate_execinstr
3599 elfcpp::SHN_UNDEF
, // small_common_shndx
3600 elfcpp::SHN_UNDEF
, // large_common_shndx
3601 0, // small_common_section_flags
3602 0, // large_common_section_flags
3603 NULL
, // attributes_section
3604 NULL
, // attributes_vendor
3605 "_start", // entry_symbol_name
3606 32, // hash_entry_size
3609 // Get the GOT section, creating it if necessary.
3611 template<int size
, bool big_endian
>
3612 Output_data_got_aarch64
<size
, big_endian
>*
3613 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3616 if (this->got_
== NULL
)
3618 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3620 // When using -z now, we can treat .got.plt as a relro section.
3621 // Without -z now, it is modified after program startup by lazy
3623 bool is_got_plt_relro
= parameters
->options().now();
3624 Output_section_order got_order
= (is_got_plt_relro
3626 : ORDER_RELRO_LAST
);
3627 Output_section_order got_plt_order
= (is_got_plt_relro
3629 : ORDER_NON_RELRO_FIRST
);
3631 // Layout of .got and .got.plt sections.
3632 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3634 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3635 // .gotplt[1] reserved for ld.so (resolver)
3636 // .gotplt[2] reserved
3638 // Generate .got section.
3639 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3641 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3642 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3643 this->got_
, got_order
, true);
3644 // The first word of GOT is reserved for the address of .dynamic.
3645 // We put 0 here now. The value will be replaced later in
3646 // Output_data_got_aarch64::do_write.
3647 this->got_
->add_constant(0);
3649 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3650 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3651 // even if there is a .got.plt section.
3652 this->global_offset_table_
=
3653 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3654 Symbol_table::PREDEFINED
,
3656 0, 0, elfcpp::STT_OBJECT
,
3658 elfcpp::STV_HIDDEN
, 0,
3661 // Generate .got.plt section.
3662 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3663 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3665 | elfcpp::SHF_WRITE
),
3666 this->got_plt_
, got_plt_order
,
3669 // The first three entries are reserved.
3670 this->got_plt_
->set_current_data_size(
3671 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3673 // If there are any IRELATIVE relocations, they get GOT entries
3674 // in .got.plt after the jump slot entries.
3675 this->got_irelative_
= new Output_data_space(size
/ 8,
3676 "** GOT IRELATIVE PLT");
3677 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3679 | elfcpp::SHF_WRITE
),
3680 this->got_irelative_
,
3684 // If there are any TLSDESC relocations, they get GOT entries in
3685 // .got.plt after the jump slot and IRELATIVE entries.
3686 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3687 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3689 | elfcpp::SHF_WRITE
),
3694 if (!is_got_plt_relro
)
3696 // Those bytes can go into the relro segment.
3697 layout
->increase_relro(
3698 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3705 // Get the dynamic reloc section, creating it if necessary.
3707 template<int size
, bool big_endian
>
3708 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3709 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3711 if (this->rela_dyn_
== NULL
)
3713 gold_assert(layout
!= NULL
);
3714 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3715 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3716 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3717 ORDER_DYNAMIC_RELOCS
, false);
3719 return this->rela_dyn_
;
3722 // Get the section to use for IRELATIVE relocs, creating it if
3723 // necessary. These go in .rela.dyn, but only after all other dynamic
3724 // relocations. They need to follow the other dynamic relocations so
3725 // that they can refer to global variables initialized by those
3728 template<int size
, bool big_endian
>
3729 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3730 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3732 if (this->rela_irelative_
== NULL
)
3734 // Make sure we have already created the dynamic reloc section.
3735 this->rela_dyn_section(layout
);
3736 this->rela_irelative_
= new Reloc_section(false);
3737 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3738 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3739 ORDER_DYNAMIC_RELOCS
, false);
3740 gold_assert(this->rela_dyn_
->output_section()
3741 == this->rela_irelative_
->output_section());
3743 return this->rela_irelative_
;
3747 // do_make_elf_object to override the same function in the base class. We need
3748 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3749 // store backend specific information. Hence we need to have our own ELF object
3752 template<int size
, bool big_endian
>
3754 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3755 const std::string
& name
,
3756 Input_file
* input_file
,
3757 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3759 int et
= ehdr
.get_e_type();
3760 // ET_EXEC files are valid input for --just-symbols/-R,
3761 // and we treat them as relocatable objects.
3762 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3763 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3764 name
, input_file
, offset
, ehdr
);
3765 else if (et
== elfcpp::ET_REL
)
3767 AArch64_relobj
<size
, big_endian
>* obj
=
3768 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3772 else if (et
== elfcpp::ET_DYN
)
3774 // Keep base implementation.
3775 Sized_dynobj
<size
, big_endian
>* obj
=
3776 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3782 gold_error(_("%s: unsupported ELF file type %d"),
3789 // Scan a relocation for stub generation.
3791 template<int size
, bool big_endian
>
3793 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3794 const Relocate_info
<size
, big_endian
>* relinfo
,
3795 unsigned int r_type
,
3796 const Sized_symbol
<size
>* gsym
,
3798 const Symbol_value
<size
>* psymval
,
3799 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3802 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3803 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3805 Symbol_value
<size
> symval
;
3808 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3809 get_reloc_property(r_type
);
3810 if (gsym
->use_plt_offset(arp
->reference_flags()))
3812 // This uses a PLT, change the symbol value.
3813 symval
.set_output_value(this->plt_address_for_global(gsym
));
3816 else if (gsym
->is_undefined())
3818 // There is no need to generate a stub symbol if the original symbol
3820 gold_debug(DEBUG_TARGET
,
3821 "stub: not creating a stub for undefined symbol %s in file %s",
3822 gsym
->name(), aarch64_relobj
->name().c_str());
3827 // Get the symbol value.
3828 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3830 // Owing to pipelining, the PC relative branches below actually skip
3831 // two instructions when the branch offset is 0.
3832 Address destination
= static_cast<Address
>(-1);
3835 case elfcpp::R_AARCH64_CALL26
:
3836 case elfcpp::R_AARCH64_JUMP26
:
3837 destination
= value
+ addend
;
3843 int stub_type
= The_reloc_stub::
3844 stub_type_for_reloc(r_type
, address
, destination
);
3845 if (stub_type
== ST_NONE
)
3848 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3849 gold_assert(stub_table
!= NULL
);
3851 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3852 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3855 stub
= new The_reloc_stub(stub_type
);
3856 stub_table
->add_reloc_stub(stub
, key
);
3858 stub
->set_destination_address(destination
);
3859 } // End of Target_aarch64::scan_reloc_for_stub
3862 // This function scans a relocation section for stub generation.
3863 // The template parameter Relocate must be a class type which provides
3864 // a single function, relocate(), which implements the machine
3865 // specific part of a relocation.
3867 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3868 // SHT_REL or SHT_RELA.
3870 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3871 // of relocs. OUTPUT_SECTION is the output section.
3872 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3873 // mapped to output offsets.
3875 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3876 // VIEW_SIZE is the size. These refer to the input section, unless
3877 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3878 // the output section.
3880 template<int size
, bool big_endian
>
3881 template<int sh_type
>
3883 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3884 const Relocate_info
<size
, big_endian
>* relinfo
,
3885 const unsigned char* prelocs
,
3887 Output_section
* /*output_section*/,
3888 bool /*needs_special_offset_handling*/,
3889 const unsigned char* /*view*/,
3890 Address view_address
,
3893 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3895 const int reloc_size
=
3896 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3897 AArch64_relobj
<size
, big_endian
>* object
=
3898 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3899 unsigned int local_count
= object
->local_symbol_count();
3901 gold::Default_comdat_behavior default_comdat_behavior
;
3902 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3904 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3906 Reltype
reloc(prelocs
);
3907 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3908 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3909 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3910 if (r_type
!= elfcpp::R_AARCH64_CALL26
3911 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3914 section_offset_type offset
=
3915 convert_to_section_size_type(reloc
.get_r_offset());
3918 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3919 reloc
.get_r_addend();
3921 const Sized_symbol
<size
>* sym
;
3922 Symbol_value
<size
> symval
;
3923 const Symbol_value
<size
> *psymval
;
3924 bool is_defined_in_discarded_section
;
3926 if (r_sym
< local_count
)
3929 psymval
= object
->local_symbol(r_sym
);
3931 // If the local symbol belongs to a section we are discarding,
3932 // and that section is a debug section, try to find the
3933 // corresponding kept section and map this symbol to its
3934 // counterpart in the kept section. The symbol must not
3935 // correspond to a section we are folding.
3937 shndx
= psymval
->input_shndx(&is_ordinary
);
3938 is_defined_in_discarded_section
=
3940 && shndx
!= elfcpp::SHN_UNDEF
3941 && !object
->is_section_included(shndx
)
3942 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3944 // We need to compute the would-be final value of this local
3946 if (!is_defined_in_discarded_section
)
3948 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3949 if (psymval
->is_section_symbol())
3950 symval
.set_is_section_symbol();
3951 typename
ObjType::Compute_final_local_value_status status
=
3952 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3954 if (status
== ObjType::CFLV_OK
)
3956 // Currently we cannot handle a branch to a target in
3957 // a merged section. If this is the case, issue an error
3958 // and also free the merge symbol value.
3959 if (!symval
.has_output_value())
3961 const std::string
& section_name
=
3962 object
->section_name(shndx
);
3963 object
->error(_("cannot handle branch to local %u "
3964 "in a merged section %s"),
3965 r_sym
, section_name
.c_str());
3971 // We cannot determine the final value.
3979 gsym
= object
->global_symbol(r_sym
);
3980 gold_assert(gsym
!= NULL
);
3981 if (gsym
->is_forwarder())
3982 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
3984 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
3985 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
3986 symval
.set_output_symtab_index(sym
->symtab_index());
3988 symval
.set_no_output_symtab_entry();
3990 // We need to compute the would-be final value of this global
3992 const Symbol_table
* symtab
= relinfo
->symtab
;
3993 const Sized_symbol
<size
>* sized_symbol
=
3994 symtab
->get_sized_symbol
<size
>(gsym
);
3995 Symbol_table::Compute_final_value_status status
;
3996 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3997 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
3999 // Skip this if the symbol has not output section.
4000 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
4002 symval
.set_output_value(value
);
4004 if (gsym
->type() == elfcpp::STT_TLS
)
4005 symval
.set_is_tls_symbol();
4006 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
4007 symval
.set_is_ifunc_symbol();
4010 is_defined_in_discarded_section
=
4011 (gsym
->is_defined_in_discarded_section()
4012 && gsym
->is_undefined());
4016 Symbol_value
<size
> symval2
;
4017 if (is_defined_in_discarded_section
)
4019 if (comdat_behavior
== CB_UNDETERMINED
)
4021 std::string name
= object
->section_name(relinfo
->data_shndx
);
4022 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
4024 if (comdat_behavior
== CB_PRETEND
)
4027 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4028 object
->map_to_kept_section(shndx
, &found
);
4030 symval2
.set_output_value(value
+ psymval
->input_value());
4032 symval2
.set_output_value(0);
4036 if (comdat_behavior
== CB_WARNING
)
4037 gold_warning_at_location(relinfo
, i
, offset
,
4038 _("relocation refers to discarded "
4040 symval2
.set_output_value(0);
4042 symval2
.set_no_output_symtab_entry();
4046 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
4047 addend
, view_address
+ offset
);
4048 } // End of iterating relocs in a section
4049 } // End of Target_aarch64::scan_reloc_section_for_stubs
4052 // Scan an input section for stub generation.
4054 template<int size
, bool big_endian
>
4056 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
4057 const Relocate_info
<size
, big_endian
>* relinfo
,
4058 unsigned int sh_type
,
4059 const unsigned char* prelocs
,
4061 Output_section
* output_section
,
4062 bool needs_special_offset_handling
,
4063 const unsigned char* view
,
4064 Address view_address
,
4065 section_size_type view_size
)
4067 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4068 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
4073 needs_special_offset_handling
,
4080 // Relocate a single reloc stub.
4082 template<int size
, bool big_endian
>
4083 void Target_aarch64
<size
, big_endian
>::
4084 relocate_reloc_stub(The_reloc_stub
* stub
,
4085 const The_relocate_info
*,
4087 unsigned char* view
,
4091 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
4092 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
4093 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
4095 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
4096 int insn_number
= stub
->insn_num();
4097 const uint32_t* insns
= stub
->insns();
4098 // Check the insns are really those stub insns.
4099 for (int i
= 0; i
< insn_number
; ++i
)
4101 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
4102 gold_assert(((uint32_t)insn
== insns
[i
]));
4105 Address dest
= stub
->destination_address();
4107 switch(stub
->type())
4109 case ST_ADRP_BRANCH
:
4111 // 1st reloc is ADR_PREL_PG_HI21
4112 The_reloc_functions_status status
=
4113 The_reloc_functions::adrp(view
, dest
, address
);
4114 // An error should never arise in the above step. If so, please
4115 // check 'aarch64_valid_for_adrp_p'.
4116 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4118 // 2nd reloc is ADD_ABS_LO12_NC
4119 const AArch64_reloc_property
* arp
=
4120 aarch64_reloc_property_table
->get_reloc_property(
4121 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
4122 gold_assert(arp
!= NULL
);
4123 status
= The_reloc_functions::template
4124 rela_general
<32>(view
+ 4, dest
, 0, arp
);
4125 // An error should never arise, it is an "_NC" relocation.
4126 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4130 case ST_LONG_BRANCH_ABS
:
4131 // 1st reloc is R_AARCH64_PREL64, at offset 8
4132 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
4135 case ST_LONG_BRANCH_PCREL
:
4137 // "PC" calculation is the 2nd insn in the stub.
4138 uint64_t offset
= dest
- (address
+ 4);
4139 // Offset is placed at offset 4 and 5.
4140 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
4150 // A class to handle the PLT data.
4151 // This is an abstract base class that handles most of the linker details
4152 // but does not know the actual contents of PLT entries. The derived
4153 // classes below fill in those details.
4155 template<int size
, bool big_endian
>
4156 class Output_data_plt_aarch64
: public Output_section_data
4159 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
4161 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4163 Output_data_plt_aarch64(Layout
* layout
,
4165 Output_data_got_aarch64
<size
, big_endian
>* got
,
4166 Output_data_space
* got_plt
,
4167 Output_data_space
* got_irelative
)
4168 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
4169 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
4170 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4171 { this->init(layout
); }
4173 // Initialize the PLT section.
4175 init(Layout
* layout
);
4177 // Add an entry to the PLT.
4179 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
4181 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4183 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
4184 Sized_relobj_file
<size
, big_endian
>* relobj
,
4185 unsigned int local_sym_index
);
4187 // Add the relocation for a PLT entry.
4189 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
4190 unsigned int got_offset
);
4192 // Add the reserved TLSDESC_PLT entry to the PLT.
4194 reserve_tlsdesc_entry(unsigned int got_offset
)
4195 { this->tlsdesc_got_offset_
= got_offset
; }
4197 // Return true if a TLSDESC_PLT entry has been reserved.
4199 has_tlsdesc_entry() const
4200 { return this->tlsdesc_got_offset_
!= -1U; }
4202 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4204 get_tlsdesc_got_offset() const
4205 { return this->tlsdesc_got_offset_
; }
4207 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4209 get_tlsdesc_plt_offset() const
4211 return (this->first_plt_entry_offset() +
4212 (this->count_
+ this->irelative_count_
)
4213 * this->get_plt_entry_size());
4216 // Return the .rela.plt section data.
4219 { return this->rel_
; }
4221 // Return where the TLSDESC relocations should go.
4223 rela_tlsdesc(Layout
*);
4225 // Return where the IRELATIVE relocations should go in the PLT
4228 rela_irelative(Symbol_table
*, Layout
*);
4230 // Return whether we created a section for IRELATIVE relocations.
4232 has_irelative_section() const
4233 { return this->irelative_rel_
!= NULL
; }
4235 // Return the number of PLT entries.
4238 { return this->count_
+ this->irelative_count_
; }
4240 // Return the offset of the first non-reserved PLT entry.
4242 first_plt_entry_offset() const
4243 { return this->do_first_plt_entry_offset(); }
4245 // Return the size of a PLT entry.
4247 get_plt_entry_size() const
4248 { return this->do_get_plt_entry_size(); }
4250 // Return the reserved tlsdesc entry size.
4252 get_plt_tlsdesc_entry_size() const
4253 { return this->do_get_plt_tlsdesc_entry_size(); }
4255 // Return the PLT address to use for a global symbol.
4257 address_for_global(const Symbol
*);
4259 // Return the PLT address to use for a local symbol.
4261 address_for_local(const Relobj
*, unsigned int symndx
);
4264 // Fill in the first PLT entry.
4266 fill_first_plt_entry(unsigned char* pov
,
4267 Address got_address
,
4268 Address plt_address
)
4269 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4271 // Fill in a normal PLT entry.
4273 fill_plt_entry(unsigned char* pov
,
4274 Address got_address
,
4275 Address plt_address
,
4276 unsigned int got_offset
,
4277 unsigned int plt_offset
)
4279 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4280 got_offset
, plt_offset
);
4283 // Fill in the reserved TLSDESC PLT entry.
4285 fill_tlsdesc_entry(unsigned char* pov
,
4286 Address gotplt_address
,
4287 Address plt_address
,
4289 unsigned int tlsdesc_got_offset
,
4290 unsigned int plt_offset
)
4292 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4293 tlsdesc_got_offset
, plt_offset
);
4296 virtual unsigned int
4297 do_first_plt_entry_offset() const = 0;
4299 virtual unsigned int
4300 do_get_plt_entry_size() const = 0;
4302 virtual unsigned int
4303 do_get_plt_tlsdesc_entry_size() const = 0;
4306 do_fill_first_plt_entry(unsigned char* pov
,
4308 Address plt_addr
) = 0;
4311 do_fill_plt_entry(unsigned char* pov
,
4312 Address got_address
,
4313 Address plt_address
,
4314 unsigned int got_offset
,
4315 unsigned int plt_offset
) = 0;
4318 do_fill_tlsdesc_entry(unsigned char* pov
,
4319 Address gotplt_address
,
4320 Address plt_address
,
4322 unsigned int tlsdesc_got_offset
,
4323 unsigned int plt_offset
) = 0;
4326 do_adjust_output_section(Output_section
* os
);
4328 // Write to a map file.
4330 do_print_to_mapfile(Mapfile
* mapfile
) const
4331 { mapfile
->print_output_data(this, _("** PLT")); }
4334 // Set the final size.
4336 set_final_data_size();
4338 // Write out the PLT data.
4340 do_write(Output_file
*);
4342 // The reloc section.
4343 Reloc_section
* rel_
;
4345 // The TLSDESC relocs, if necessary. These must follow the regular
4347 Reloc_section
* tlsdesc_rel_
;
4349 // The IRELATIVE relocs, if necessary. These must follow the
4350 // regular PLT relocations.
4351 Reloc_section
* irelative_rel_
;
4353 // The .got section.
4354 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4356 // The .got.plt section.
4357 Output_data_space
* got_plt_
;
4359 // The part of the .got.plt section used for IRELATIVE relocs.
4360 Output_data_space
* got_irelative_
;
4362 // The number of PLT entries.
4363 unsigned int count_
;
4365 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4366 // follow the regular PLT entries.
4367 unsigned int irelative_count_
;
4369 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4370 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4371 // indicates an offset is not allocated.
4372 unsigned int tlsdesc_got_offset_
;
4375 // Initialize the PLT section.
4377 template<int size
, bool big_endian
>
4379 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4381 this->rel_
= new Reloc_section(false);
4382 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4383 elfcpp::SHF_ALLOC
, this->rel_
,
4384 ORDER_DYNAMIC_PLT_RELOCS
, false);
4387 template<int size
, bool big_endian
>
4389 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4392 os
->set_entsize(this->get_plt_entry_size());
4395 // Add an entry to the PLT.
4397 template<int size
, bool big_endian
>
4399 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4400 Layout
* layout
, Symbol
* gsym
)
4402 gold_assert(!gsym
->has_plt_offset());
4404 unsigned int* pcount
;
4405 unsigned int plt_reserved
;
4406 Output_section_data_build
* got
;
4408 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4409 && gsym
->can_use_relative_reloc(false))
4411 pcount
= &this->irelative_count_
;
4413 got
= this->got_irelative_
;
4417 pcount
= &this->count_
;
4418 plt_reserved
= this->first_plt_entry_offset();
4419 got
= this->got_plt_
;
4422 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4427 section_offset_type got_offset
= got
->current_data_size();
4429 // Every PLT entry needs a GOT entry which points back to the PLT
4430 // entry (this will be changed by the dynamic linker, normally
4431 // lazily when the function is called).
4432 got
->set_current_data_size(got_offset
+ size
/ 8);
4434 // Every PLT entry needs a reloc.
4435 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4437 // Note that we don't need to save the symbol. The contents of the
4438 // PLT are independent of which symbols are used. The symbols only
4439 // appear in the relocations.
4442 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4445 template<int size
, bool big_endian
>
4447 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4448 Symbol_table
* symtab
,
4450 Sized_relobj_file
<size
, big_endian
>* relobj
,
4451 unsigned int local_sym_index
)
4453 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4454 ++this->irelative_count_
;
4456 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4458 // Every PLT entry needs a GOT entry which points back to the PLT
4460 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4462 // Every PLT entry needs a reloc.
4463 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4464 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4465 elfcpp::R_AARCH64_IRELATIVE
,
4466 this->got_irelative_
, got_offset
, 0);
4471 // Add the relocation for a PLT entry.
4473 template<int size
, bool big_endian
>
4475 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4476 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4478 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4479 && gsym
->can_use_relative_reloc(false))
4481 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4482 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4483 this->got_irelative_
, got_offset
, 0);
4487 gsym
->set_needs_dynsym_entry();
4488 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4493 // Return where the TLSDESC relocations should go, creating it if
4494 // necessary. These follow the JUMP_SLOT relocations.
4496 template<int size
, bool big_endian
>
4497 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4498 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4500 if (this->tlsdesc_rel_
== NULL
)
4502 this->tlsdesc_rel_
= new Reloc_section(false);
4503 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4504 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4505 ORDER_DYNAMIC_PLT_RELOCS
, false);
4506 gold_assert(this->tlsdesc_rel_
->output_section()
4507 == this->rel_
->output_section());
4509 return this->tlsdesc_rel_
;
4512 // Return where the IRELATIVE relocations should go in the PLT. These
4513 // follow the JUMP_SLOT and the TLSDESC relocations.
4515 template<int size
, bool big_endian
>
4516 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4517 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4520 if (this->irelative_rel_
== NULL
)
4522 // Make sure we have a place for the TLSDESC relocations, in
4523 // case we see any later on.
4524 this->rela_tlsdesc(layout
);
4525 this->irelative_rel_
= new Reloc_section(false);
4526 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4527 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4528 ORDER_DYNAMIC_PLT_RELOCS
, false);
4529 gold_assert(this->irelative_rel_
->output_section()
4530 == this->rel_
->output_section());
4532 if (parameters
->doing_static_link())
4534 // A statically linked executable will only have a .rela.plt
4535 // section to hold R_AARCH64_IRELATIVE relocs for
4536 // STT_GNU_IFUNC symbols. The library will use these
4537 // symbols to locate the IRELATIVE relocs at program startup
4539 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4540 Symbol_table::PREDEFINED
,
4541 this->irelative_rel_
, 0, 0,
4542 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4543 elfcpp::STV_HIDDEN
, 0, false, true);
4544 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4545 Symbol_table::PREDEFINED
,
4546 this->irelative_rel_
, 0, 0,
4547 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4548 elfcpp::STV_HIDDEN
, 0, true, true);
4551 return this->irelative_rel_
;
4554 // Return the PLT address to use for a global symbol.
4556 template<int size
, bool big_endian
>
4558 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4561 uint64_t offset
= 0;
4562 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4563 && gsym
->can_use_relative_reloc(false))
4564 offset
= (this->first_plt_entry_offset() +
4565 this->count_
* this->get_plt_entry_size());
4566 return this->address() + offset
+ gsym
->plt_offset();
4569 // Return the PLT address to use for a local symbol. These are always
4570 // IRELATIVE relocs.
4572 template<int size
, bool big_endian
>
4574 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4575 const Relobj
* object
,
4578 return (this->address()
4579 + this->first_plt_entry_offset()
4580 + this->count_
* this->get_plt_entry_size()
4581 + object
->local_plt_offset(r_sym
));
4584 // Set the final size.
4586 template<int size
, bool big_endian
>
4588 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4590 unsigned int count
= this->count_
+ this->irelative_count_
;
4591 unsigned int extra_size
= 0;
4592 if (this->has_tlsdesc_entry())
4593 extra_size
+= this->get_plt_tlsdesc_entry_size();
4594 this->set_data_size(this->first_plt_entry_offset()
4595 + count
* this->get_plt_entry_size()
4599 template<int size
, bool big_endian
>
4600 class Output_data_plt_aarch64_standard
:
4601 public Output_data_plt_aarch64
<size
, big_endian
>
4604 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4605 Output_data_plt_aarch64_standard(
4607 Output_data_got_aarch64
<size
, big_endian
>* got
,
4608 Output_data_space
* got_plt
,
4609 Output_data_space
* got_irelative
)
4610 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4617 // Return the offset of the first non-reserved PLT entry.
4618 virtual unsigned int
4619 do_first_plt_entry_offset() const
4620 { return this->first_plt_entry_size
; }
4622 // Return the size of a PLT entry
4623 virtual unsigned int
4624 do_get_plt_entry_size() const
4625 { return this->plt_entry_size
; }
4627 // Return the size of a tlsdesc entry
4628 virtual unsigned int
4629 do_get_plt_tlsdesc_entry_size() const
4630 { return this->plt_tlsdesc_entry_size
; }
4633 do_fill_first_plt_entry(unsigned char* pov
,
4634 Address got_address
,
4635 Address plt_address
);
4638 do_fill_plt_entry(unsigned char* pov
,
4639 Address got_address
,
4640 Address plt_address
,
4641 unsigned int got_offset
,
4642 unsigned int plt_offset
);
4645 do_fill_tlsdesc_entry(unsigned char* pov
,
4646 Address gotplt_address
,
4647 Address plt_address
,
4649 unsigned int tlsdesc_got_offset
,
4650 unsigned int plt_offset
);
4653 // The size of the first plt entry size.
4654 static const int first_plt_entry_size
= 32;
4655 // The size of the plt entry size.
4656 static const int plt_entry_size
= 16;
4657 // The size of the plt tlsdesc entry size.
4658 static const int plt_tlsdesc_entry_size
= 32;
4659 // Template for the first PLT entry.
4660 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4661 // Template for subsequent PLT entries.
4662 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4663 // The reserved TLSDESC entry in the PLT for an executable.
4664 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4667 // The first entry in the PLT for an executable.
4671 Output_data_plt_aarch64_standard
<32, false>::
4672 first_plt_entry
[first_plt_entry_size
/ 4] =
4674 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4675 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4676 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4677 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4678 0xd61f0220, /* br x17 */
4679 0xd503201f, /* nop */
4680 0xd503201f, /* nop */
4681 0xd503201f, /* nop */
4687 Output_data_plt_aarch64_standard
<32, true>::
4688 first_plt_entry
[first_plt_entry_size
/ 4] =
4690 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4691 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4692 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4693 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4694 0xd61f0220, /* br x17 */
4695 0xd503201f, /* nop */
4696 0xd503201f, /* nop */
4697 0xd503201f, /* nop */
4703 Output_data_plt_aarch64_standard
<64, false>::
4704 first_plt_entry
[first_plt_entry_size
/ 4] =
4706 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4707 0x90000010, /* adrp x16, PLT_GOT+16 */
4708 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4709 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4710 0xd61f0220, /* br x17 */
4711 0xd503201f, /* nop */
4712 0xd503201f, /* nop */
4713 0xd503201f, /* nop */
4719 Output_data_plt_aarch64_standard
<64, true>::
4720 first_plt_entry
[first_plt_entry_size
/ 4] =
4722 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4723 0x90000010, /* adrp x16, PLT_GOT+16 */
4724 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4725 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4726 0xd61f0220, /* br x17 */
4727 0xd503201f, /* nop */
4728 0xd503201f, /* nop */
4729 0xd503201f, /* nop */
4735 Output_data_plt_aarch64_standard
<32, false>::
4736 plt_entry
[plt_entry_size
/ 4] =
4738 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4739 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4740 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4741 0xd61f0220, /* br x17. */
4747 Output_data_plt_aarch64_standard
<32, true>::
4748 plt_entry
[plt_entry_size
/ 4] =
4750 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4751 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4752 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4753 0xd61f0220, /* br x17. */
4759 Output_data_plt_aarch64_standard
<64, false>::
4760 plt_entry
[plt_entry_size
/ 4] =
4762 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4763 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4764 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4765 0xd61f0220, /* br x17. */
4771 Output_data_plt_aarch64_standard
<64, true>::
4772 plt_entry
[plt_entry_size
/ 4] =
4774 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4775 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4776 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4777 0xd61f0220, /* br x17. */
4781 template<int size
, bool big_endian
>
4783 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4785 Address got_address
,
4786 Address plt_address
)
4788 // PLT0 of the small PLT looks like this in ELF64 -
4789 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4790 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4791 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4793 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4794 // GOTPLT entry for this.
4796 // PLT0 will be slightly different in ELF32 due to different got entry
4798 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4799 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4801 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4802 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4803 // FIXME: This only works for 64bit
4804 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4805 gotplt_2nd_ent
, plt_address
+ 4);
4807 // Fill in R_AARCH64_LDST8_LO12
4808 elfcpp::Swap
<32, big_endian
>::writeval(
4810 ((this->first_plt_entry
[2] & 0xffc003ff)
4811 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4813 // Fill in R_AARCH64_ADD_ABS_LO12
4814 elfcpp::Swap
<32, big_endian
>::writeval(
4816 ((this->first_plt_entry
[3] & 0xffc003ff)
4817 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4821 // Subsequent entries in the PLT for an executable.
4822 // FIXME: This only works for 64bit
4824 template<int size
, bool big_endian
>
4826 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4828 Address got_address
,
4829 Address plt_address
,
4830 unsigned int got_offset
,
4831 unsigned int plt_offset
)
4833 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4835 Address gotplt_entry_address
= got_address
+ got_offset
;
4836 Address plt_entry_address
= plt_address
+ plt_offset
;
4838 // Fill in R_AARCH64_PCREL_ADR_HI21
4839 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4841 gotplt_entry_address
,
4844 // Fill in R_AARCH64_LDST64_ABS_LO12
4845 elfcpp::Swap
<32, big_endian
>::writeval(
4847 ((this->plt_entry
[1] & 0xffc003ff)
4848 | ((gotplt_entry_address
& 0xff8) << 7)));
4850 // Fill in R_AARCH64_ADD_ABS_LO12
4851 elfcpp::Swap
<32, big_endian
>::writeval(
4853 ((this->plt_entry
[2] & 0xffc003ff)
4854 | ((gotplt_entry_address
& 0xfff) <<10)));
4861 Output_data_plt_aarch64_standard
<32, false>::
4862 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4864 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4865 0x90000002, /* adrp x2, 0 */
4866 0x90000003, /* adrp x3, 0 */
4867 0xb9400042, /* ldr w2, [w2, #0] */
4868 0x11000063, /* add w3, w3, 0 */
4869 0xd61f0040, /* br x2 */
4870 0xd503201f, /* nop */
4871 0xd503201f, /* nop */
4876 Output_data_plt_aarch64_standard
<32, true>::
4877 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4879 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4880 0x90000002, /* adrp x2, 0 */
4881 0x90000003, /* adrp x3, 0 */
4882 0xb9400042, /* ldr w2, [w2, #0] */
4883 0x11000063, /* add w3, w3, 0 */
4884 0xd61f0040, /* br x2 */
4885 0xd503201f, /* nop */
4886 0xd503201f, /* nop */
4891 Output_data_plt_aarch64_standard
<64, false>::
4892 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4894 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4895 0x90000002, /* adrp x2, 0 */
4896 0x90000003, /* adrp x3, 0 */
4897 0xf9400042, /* ldr x2, [x2, #0] */
4898 0x91000063, /* add x3, x3, 0 */
4899 0xd61f0040, /* br x2 */
4900 0xd503201f, /* nop */
4901 0xd503201f, /* nop */
4906 Output_data_plt_aarch64_standard
<64, true>::
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 0xf9400042, /* ldr x2, [x2, #0] */
4913 0x91000063, /* add x3, x3, 0 */
4914 0xd61f0040, /* br x2 */
4915 0xd503201f, /* nop */
4916 0xd503201f, /* nop */
4919 template<int size
, bool big_endian
>
4921 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4923 Address gotplt_address
,
4924 Address plt_address
,
4926 unsigned int tlsdesc_got_offset
,
4927 unsigned int plt_offset
)
4929 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4931 // move DT_TLSDESC_GOT address into x2
4932 // move .got.plt address into x3
4933 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4934 Address plt_entry_address
= plt_address
+ plt_offset
;
4936 // R_AARCH64_ADR_PREL_PG_HI21
4937 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4940 plt_entry_address
+ 4);
4942 // R_AARCH64_ADR_PREL_PG_HI21
4943 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4946 plt_entry_address
+ 8);
4948 // R_AARCH64_LDST64_ABS_LO12
4949 elfcpp::Swap
<32, big_endian
>::writeval(
4951 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4952 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4954 // R_AARCH64_ADD_ABS_LO12
4955 elfcpp::Swap
<32, big_endian
>::writeval(
4957 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
4958 | ((gotplt_address
& 0xfff) << 10)));
4961 // Write out the PLT. This uses the hand-coded instructions above,
4962 // and adjusts them as needed. This is specified by the AMD64 ABI.
4964 template<int size
, bool big_endian
>
4966 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
4968 const off_t offset
= this->offset();
4969 const section_size_type oview_size
=
4970 convert_to_section_size_type(this->data_size());
4971 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
4973 const off_t got_file_offset
= this->got_plt_
->offset();
4974 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
4975 == this->got_irelative_
->offset());
4977 const section_size_type got_size
=
4978 convert_to_section_size_type(this->got_plt_
->data_size()
4979 + this->got_irelative_
->data_size());
4980 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
4983 unsigned char* pov
= oview
;
4985 // The base address of the .plt section.
4986 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
4987 // The base address of the PLT portion of the .got section.
4988 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
4989 = this->got_plt_
->address();
4991 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
4992 pov
+= this->first_plt_entry_offset();
4994 // The first three entries in .got.plt are reserved.
4995 unsigned char* got_pov
= got_view
;
4996 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
4997 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4999 unsigned int plt_offset
= this->first_plt_entry_offset();
5000 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5001 const unsigned int count
= this->count_
+ this->irelative_count_
;
5002 for (unsigned int plt_index
= 0;
5005 pov
+= this->get_plt_entry_size(),
5006 got_pov
+= size
/ 8,
5007 plt_offset
+= this->get_plt_entry_size(),
5008 got_offset
+= size
/ 8)
5010 // Set and adjust the PLT entry itself.
5011 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
5012 got_offset
, plt_offset
);
5014 // Set the entry in the GOT, which points to plt0.
5015 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
5018 if (this->has_tlsdesc_entry())
5020 // Set and adjust the reserved TLSDESC PLT entry.
5021 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
5022 // The base address of the .base section.
5023 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
5024 this->got_
->address();
5025 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
5026 tlsdesc_got_offset
, plt_offset
);
5027 pov
+= this->get_plt_tlsdesc_entry_size();
5030 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
5031 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
5033 of
->write_output_view(offset
, oview_size
, oview
);
5034 of
->write_output_view(got_file_offset
, got_size
, got_view
);
5037 // Telling how to update the immediate field of an instruction.
5038 struct AArch64_howto
5040 // The immediate field mask.
5041 elfcpp::Elf_Xword dst_mask
;
5043 // The offset to apply relocation immediate
5046 // The second part offset, if the immediate field has two parts.
5047 // -1 if the immediate field has only one part.
5051 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
5053 {0, -1, -1}, // DATA
5054 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
5055 {0xffffe0, 5, -1}, // LD [23:5]-imm19
5056 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
5057 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
5058 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
5059 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
5060 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
5061 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
5062 {0x3ffffff, 0, -1}, // B [25:0]-imm26
5063 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
5066 // AArch64 relocate function class
5068 template<int size
, bool big_endian
>
5069 class AArch64_relocate_functions
5074 STATUS_OKAY
, // No error during relocation.
5075 STATUS_OVERFLOW
, // Relocation overflow.
5076 STATUS_BAD_RELOC
, // Relocation cannot be applied.
5079 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
5080 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
5081 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
5082 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
5083 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
5084 typedef Stub_table
<size
, big_endian
> The_stub_table
;
5085 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
5086 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
5088 // Return the page address of the address.
5089 // Page(address) = address & ~0xFFF
5091 static inline AArch64_valtype
5092 Page(Address address
)
5094 return (address
& (~static_cast<Address
>(0xFFF)));
5098 // Update instruction (pointed by view) with selected bits (immed).
5099 // val = (val & ~dst_mask) | (immed << doffset)
5101 template<int valsize
>
5103 update_view(unsigned char* view
,
5104 AArch64_valtype immed
,
5105 elfcpp::Elf_Xword doffset
,
5106 elfcpp::Elf_Xword dst_mask
)
5108 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5109 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5110 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5112 // Clear immediate fields.
5114 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5115 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5118 // Update two parts of an instruction (pointed by view) with selected
5119 // bits (immed1 and immed2).
5120 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5122 template<int valsize
>
5124 update_view_two_parts(
5125 unsigned char* view
,
5126 AArch64_valtype immed1
,
5127 AArch64_valtype immed2
,
5128 elfcpp::Elf_Xword doffset1
,
5129 elfcpp::Elf_Xword doffset2
,
5130 elfcpp::Elf_Xword dst_mask
)
5132 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5133 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5134 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5136 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5137 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
5138 (immed2
<< doffset2
)));
5141 // Update adr or adrp instruction with immed.
5142 // In adr and adrp: [30:29] immlo [23:5] immhi
5145 update_adr(unsigned char* view
, AArch64_valtype immed
)
5147 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
5148 This::template update_view_two_parts
<32>(
5151 (immed
& 0x1ffffc) >> 2,
5157 // Update movz/movn instruction with bits immed.
5158 // Set instruction to movz if is_movz is true, otherwise set instruction
5162 update_movnz(unsigned char* view
,
5163 AArch64_valtype immed
,
5166 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
5167 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5168 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
5170 const elfcpp::Elf_Xword doffset
=
5171 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
5172 const elfcpp::Elf_Xword dst_mask
=
5173 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
5175 // Clear immediate fields and opc code.
5176 val
&= ~(dst_mask
| (0x3 << 29));
5178 // Set instruction to movz or movn.
5179 // movz: [30:29] is 10 movn: [30:29] is 00
5183 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
5184 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5189 // Update selected bits in text.
5191 template<int valsize
>
5192 static inline typename
This::Status
5193 reloc_common(unsigned char* view
, Address x
,
5194 const AArch64_reloc_property
* reloc_property
)
5196 // Select bits from X.
5197 Address immed
= reloc_property
->select_x_value(x
);
5200 const AArch64_reloc_property::Reloc_inst inst
=
5201 reloc_property
->reloc_inst();
5202 // If it is a data relocation or instruction has 2 parts of immediate
5203 // fields, you should not call pcrela_general.
5204 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
5205 aarch64_howto
[inst
].doffset
!= -1);
5206 This::template update_view
<valsize
>(view
, immed
,
5207 aarch64_howto
[inst
].doffset
,
5208 aarch64_howto
[inst
].dst_mask
);
5210 // Do check overflow or alignment if needed.
5211 return (reloc_property
->checkup_x_value(x
)
5213 : This::STATUS_OVERFLOW
);
5216 // Construct a B insn. Note, although we group it here with other relocation
5217 // operation, there is actually no 'relocation' involved here.
5219 construct_b(unsigned char* view
, unsigned int branch_offset
)
5221 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5225 // Do a simple rela relocation at unaligned addresses.
5227 template<int valsize
>
5228 static inline typename
This::Status
5229 rela_ua(unsigned char* view
,
5230 const Sized_relobj_file
<size
, big_endian
>* object
,
5231 const Symbol_value
<size
>* psymval
,
5232 AArch64_valtype addend
,
5233 const AArch64_reloc_property
* reloc_property
)
5235 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5237 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5238 psymval
->value(object
, addend
);
5239 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5240 static_cast<Valtype
>(x
));
5241 return (reloc_property
->checkup_x_value(x
)
5243 : This::STATUS_OVERFLOW
);
5246 // Do a simple pc-relative relocation at unaligned addresses.
5248 template<int valsize
>
5249 static inline typename
This::Status
5250 pcrela_ua(unsigned char* view
,
5251 const Sized_relobj_file
<size
, big_endian
>* object
,
5252 const Symbol_value
<size
>* psymval
,
5253 AArch64_valtype addend
,
5255 const AArch64_reloc_property
* reloc_property
)
5257 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5259 Address x
= psymval
->value(object
, addend
) - address
;
5260 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5261 static_cast<Valtype
>(x
));
5262 return (reloc_property
->checkup_x_value(x
)
5264 : This::STATUS_OVERFLOW
);
5267 // Do a simple rela relocation at aligned addresses.
5269 template<int valsize
>
5270 static inline typename
This::Status
5272 unsigned char* view
,
5273 const Sized_relobj_file
<size
, big_endian
>* object
,
5274 const Symbol_value
<size
>* psymval
,
5275 AArch64_valtype addend
,
5276 const AArch64_reloc_property
* reloc_property
)
5278 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5279 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5280 Address x
= psymval
->value(object
, addend
);
5281 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5282 return (reloc_property
->checkup_x_value(x
)
5284 : This::STATUS_OVERFLOW
);
5287 // Do relocate. Update selected bits in text.
5288 // new_val = (val & ~dst_mask) | (immed << doffset)
5290 template<int valsize
>
5291 static inline typename
This::Status
5292 rela_general(unsigned char* view
,
5293 const Sized_relobj_file
<size
, big_endian
>* object
,
5294 const Symbol_value
<size
>* psymval
,
5295 AArch64_valtype addend
,
5296 const AArch64_reloc_property
* reloc_property
)
5298 // Calculate relocation.
5299 Address x
= psymval
->value(object
, addend
);
5300 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5303 // Do relocate. Update selected bits in text.
5304 // new val = (val & ~dst_mask) | (immed << doffset)
5306 template<int valsize
>
5307 static inline typename
This::Status
5309 unsigned char* view
,
5311 AArch64_valtype addend
,
5312 const AArch64_reloc_property
* reloc_property
)
5314 // Calculate relocation.
5315 Address x
= s
+ addend
;
5316 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5319 // Do address relative relocate. Update selected bits in text.
5320 // new val = (val & ~dst_mask) | (immed << doffset)
5322 template<int valsize
>
5323 static inline typename
This::Status
5325 unsigned char* view
,
5326 const Sized_relobj_file
<size
, big_endian
>* object
,
5327 const Symbol_value
<size
>* psymval
,
5328 AArch64_valtype addend
,
5330 const AArch64_reloc_property
* reloc_property
)
5332 // Calculate relocation.
5333 Address x
= psymval
->value(object
, addend
) - address
;
5334 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5338 // Calculate (S + A) - address, update adr instruction.
5340 static inline typename
This::Status
5341 adr(unsigned char* view
,
5342 const Sized_relobj_file
<size
, big_endian
>* object
,
5343 const Symbol_value
<size
>* psymval
,
5346 const AArch64_reloc_property
* /* reloc_property */)
5348 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5349 // Pick bits [20:0] of X.
5350 AArch64_valtype immed
= x
& 0x1fffff;
5351 update_adr(view
, immed
);
5352 // Check -2^20 <= X < 2^20
5353 return (size
== 64 && Bits
<21>::has_overflow((x
))
5354 ? This::STATUS_OVERFLOW
5355 : This::STATUS_OKAY
);
5358 // Calculate PG(S+A) - PG(address), update adrp instruction.
5359 // R_AARCH64_ADR_PREL_PG_HI21
5361 static inline typename
This::Status
5363 unsigned char* view
,
5367 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5368 // Pick [32:12] of X.
5369 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5370 update_adr(view
, immed
);
5371 // Check -2^32 <= X < 2^32
5372 return (size
== 64 && Bits
<33>::has_overflow((x
))
5373 ? This::STATUS_OVERFLOW
5374 : This::STATUS_OKAY
);
5377 // Calculate PG(S+A) - PG(address), update adrp instruction.
5378 // R_AARCH64_ADR_PREL_PG_HI21
5380 static inline typename
This::Status
5381 adrp(unsigned char* view
,
5382 const Sized_relobj_file
<size
, big_endian
>* object
,
5383 const Symbol_value
<size
>* psymval
,
5386 const AArch64_reloc_property
* reloc_property
)
5388 Address sa
= psymval
->value(object
, addend
);
5389 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5390 // Pick [32:12] of X.
5391 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5392 update_adr(view
, immed
);
5393 return (reloc_property
->checkup_x_value(x
)
5395 : This::STATUS_OVERFLOW
);
5398 // Update mov[n/z] instruction. Check overflow if needed.
5399 // If X >=0, set the instruction to movz and its immediate value to the
5401 // If X < 0, set the instruction to movn and its immediate value to
5402 // NOT (selected bits of).
5404 static inline typename
This::Status
5405 movnz(unsigned char* view
,
5407 const AArch64_reloc_property
* reloc_property
)
5409 // Select bits from X.
5412 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5413 if (static_cast<SignedW
>(x
) >= 0)
5415 immed
= reloc_property
->select_x_value(x
);
5420 immed
= reloc_property
->select_x_value(~x
);;
5424 // Update movnz instruction.
5425 update_movnz(view
, immed
, is_movz
);
5427 // Do check overflow or alignment if needed.
5428 return (reloc_property
->checkup_x_value(x
)
5430 : This::STATUS_OVERFLOW
);
5434 maybe_apply_stub(unsigned int,
5435 const The_relocate_info
*,
5439 const Sized_symbol
<size
>*,
5440 const Symbol_value
<size
>*,
5441 const Sized_relobj_file
<size
, big_endian
>*,
5444 }; // End of AArch64_relocate_functions
5447 // For a certain relocation type (usually jump/branch), test to see if the
5448 // destination needs a stub to fulfil. If so, re-route the destination of the
5449 // original instruction to the stub, note, at this time, the stub has already
5452 template<int size
, bool big_endian
>
5454 AArch64_relocate_functions
<size
, big_endian
>::
5455 maybe_apply_stub(unsigned int r_type
,
5456 const The_relocate_info
* relinfo
,
5457 const The_rela
& rela
,
5458 unsigned char* view
,
5460 const Sized_symbol
<size
>* gsym
,
5461 const Symbol_value
<size
>* psymval
,
5462 const Sized_relobj_file
<size
, big_endian
>* object
,
5463 section_size_type current_group_size
)
5465 if (parameters
->options().relocatable())
5468 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5469 Address branch_target
= psymval
->value(object
, 0) + addend
;
5471 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5472 if (stub_type
== ST_NONE
)
5475 const The_aarch64_relobj
* aarch64_relobj
=
5476 static_cast<const The_aarch64_relobj
*>(object
);
5477 const AArch64_reloc_property
* arp
=
5478 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5479 gold_assert(arp
!= NULL
);
5481 // We don't create stubs for undefined symbols, but do for weak.
5483 && !gsym
->use_plt_offset(arp
->reference_flags())
5484 && gsym
->is_undefined())
5486 gold_debug(DEBUG_TARGET
,
5487 "stub: looking for a stub for undefined symbol %s in file %s",
5488 gsym
->name(), aarch64_relobj
->name().c_str());
5492 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5493 gold_assert(stub_table
!= NULL
);
5495 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5496 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5497 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5498 gold_assert(stub
!= NULL
);
5500 Address new_branch_target
= stub_table
->address() + stub
->offset();
5501 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5502 new_branch_target
- address
;
5503 typename
This::Status status
= This::template
5504 rela_general
<32>(view
, branch_offset
, 0, arp
);
5505 if (status
!= This::STATUS_OKAY
)
5506 gold_error(_("Stub is too far away, try a smaller value "
5507 "for '--stub-group-size'. The current value is 0x%lx."),
5508 static_cast<unsigned long>(current_group_size
));
5513 // Group input sections for stub generation.
5515 // We group input sections in an output section so that the total size,
5516 // including any padding space due to alignment is smaller than GROUP_SIZE
5517 // unless the only input section in group is bigger than GROUP_SIZE already.
5518 // Then an ARM stub table is created to follow the last input section
5519 // in group. For each group an ARM stub table is created an is placed
5520 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5521 // extend the group after the stub table.
5523 template<int size
, bool big_endian
>
5525 Target_aarch64
<size
, big_endian
>::group_sections(
5527 section_size_type group_size
,
5528 bool stubs_always_after_branch
,
5531 // Group input sections and insert stub table
5532 Layout::Section_list section_list
;
5533 layout
->get_executable_sections(§ion_list
);
5534 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5535 p
!= section_list
.end();
5538 AArch64_output_section
<size
, big_endian
>* output_section
=
5539 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5540 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5546 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5547 // section of RELOBJ.
5549 template<int size
, bool big_endian
>
5550 AArch64_input_section
<size
, big_endian
>*
5551 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5552 Relobj
* relobj
, unsigned int shndx
) const
5554 Section_id
sid(relobj
, shndx
);
5555 typename
AArch64_input_section_map::const_iterator p
=
5556 this->aarch64_input_section_map_
.find(sid
);
5557 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5561 // Make a new AArch64_input_section object.
5563 template<int size
, bool big_endian
>
5564 AArch64_input_section
<size
, big_endian
>*
5565 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5566 Relobj
* relobj
, unsigned int shndx
)
5568 Section_id
sid(relobj
, shndx
);
5570 AArch64_input_section
<size
, big_endian
>* input_section
=
5571 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5572 input_section
->init();
5574 // Register new AArch64_input_section in map for look-up.
5575 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5576 this->aarch64_input_section_map_
.insert(
5577 std::make_pair(sid
, input_section
));
5579 // Make sure that it we have not created another AArch64_input_section
5580 // for this input section already.
5581 gold_assert(ins
.second
);
5583 return input_section
;
5587 // Relaxation hook. This is where we do stub generation.
5589 template<int size
, bool big_endian
>
5591 Target_aarch64
<size
, big_endian
>::do_relax(
5593 const Input_objects
* input_objects
,
5594 Symbol_table
* symtab
,
5598 gold_assert(!parameters
->options().relocatable());
5601 // We don't handle negative stub_group_size right now.
5602 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5603 if (this->stub_group_size_
== 1)
5605 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5606 // will fail to link. The user will have to relink with an explicit
5607 // group size option.
5608 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5611 group_sections(layout
, this->stub_group_size_
, true, task
);
5615 // If this is not the first pass, addresses and file offsets have
5616 // been reset at this point, set them here.
5617 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5618 sp
!= this->stub_tables_
.end(); ++sp
)
5620 The_stub_table
* stt
= *sp
;
5621 The_aarch64_input_section
* owner
= stt
->owner();
5622 off_t off
= align_address(owner
->original_size(),
5624 stt
->set_address_and_file_offset(owner
->address() + off
,
5625 owner
->offset() + off
);
5629 // Scan relocs for relocation stubs
5630 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5631 op
!= input_objects
->relobj_end();
5634 The_aarch64_relobj
* aarch64_relobj
=
5635 static_cast<The_aarch64_relobj
*>(*op
);
5636 // Lock the object so we can read from it. This is only called
5637 // single-threaded from Layout::finalize, so it is OK to lock.
5638 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5639 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5642 bool any_stub_table_changed
= false;
5643 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5644 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5646 The_stub_table
* stub_table
= *siter
;
5647 if (stub_table
->update_data_size_changed_p())
5649 The_aarch64_input_section
* owner
= stub_table
->owner();
5650 uint64_t address
= owner
->address();
5651 off_t offset
= owner
->offset();
5652 owner
->reset_address_and_file_offset();
5653 owner
->set_address_and_file_offset(address
, offset
);
5655 any_stub_table_changed
= true;
5659 // Do not continue relaxation.
5660 bool continue_relaxation
= any_stub_table_changed
;
5661 if (!continue_relaxation
)
5662 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5663 (sp
!= this->stub_tables_
.end());
5665 (*sp
)->finalize_stubs();
5667 return continue_relaxation
;
5671 // Make a new Stub_table.
5673 template<int size
, bool big_endian
>
5674 Stub_table
<size
, big_endian
>*
5675 Target_aarch64
<size
, big_endian
>::new_stub_table(
5676 AArch64_input_section
<size
, big_endian
>* owner
)
5678 Stub_table
<size
, big_endian
>* stub_table
=
5679 new Stub_table
<size
, big_endian
>(owner
);
5680 stub_table
->set_address(align_address(
5681 owner
->address() + owner
->data_size(), 8));
5682 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5683 stub_table
->finalize_data_size();
5685 this->stub_tables_
.push_back(stub_table
);
5691 template<int size
, bool big_endian
>
5693 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5694 void* arg
, unsigned int r_type
, uint64_t) const
5696 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5697 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5698 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5699 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5700 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5701 gold_assert(psymval
->is_tls_symbol());
5702 // The value of a TLS symbol is the offset in the TLS segment.
5703 return psymval
->value(ti
.object
, 0);
5706 // Return the number of entries in the PLT.
5708 template<int size
, bool big_endian
>
5710 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5712 if (this->plt_
== NULL
)
5714 return this->plt_
->entry_count();
5717 // Return the offset of the first non-reserved PLT entry.
5719 template<int size
, bool big_endian
>
5721 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5723 return this->plt_
->first_plt_entry_offset();
5726 // Return the size of each PLT entry.
5728 template<int size
, bool big_endian
>
5730 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5732 return this->plt_
->get_plt_entry_size();
5735 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5737 template<int size
, bool big_endian
>
5739 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5740 Symbol_table
* symtab
, Layout
* layout
)
5742 if (this->tls_base_symbol_defined_
)
5745 Output_segment
* tls_segment
= layout
->tls_segment();
5746 if (tls_segment
!= NULL
)
5748 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5749 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5750 Symbol_table::PREDEFINED
,
5754 elfcpp::STV_HIDDEN
, 0,
5755 Symbol::SEGMENT_START
,
5758 this->tls_base_symbol_defined_
= true;
5761 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5763 template<int size
, bool big_endian
>
5765 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5766 Symbol_table
* symtab
, Layout
* layout
)
5768 if (this->plt_
== NULL
)
5769 this->make_plt_section(symtab
, layout
);
5771 if (!this->plt_
->has_tlsdesc_entry())
5773 // Allocate the TLSDESC_GOT entry.
5774 Output_data_got_aarch64
<size
, big_endian
>* got
=
5775 this->got_section(symtab
, layout
);
5776 unsigned int got_offset
= got
->add_constant(0);
5778 // Allocate the TLSDESC_PLT entry.
5779 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5783 // Create a GOT entry for the TLS module index.
5785 template<int size
, bool big_endian
>
5787 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5788 Symbol_table
* symtab
, Layout
* layout
,
5789 Sized_relobj_file
<size
, big_endian
>* object
)
5791 if (this->got_mod_index_offset_
== -1U)
5793 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5794 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5795 Output_data_got_aarch64
<size
, big_endian
>* got
=
5796 this->got_section(symtab
, layout
);
5797 unsigned int got_offset
= got
->add_constant(0);
5798 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5800 got
->add_constant(0);
5801 this->got_mod_index_offset_
= got_offset
;
5803 return this->got_mod_index_offset_
;
5806 // Optimize the TLS relocation type based on what we know about the
5807 // symbol. IS_FINAL is true if the final address of this symbol is
5808 // known at link time.
5810 template<int size
, bool big_endian
>
5811 tls::Tls_optimization
5812 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5815 // If we are generating a shared library, then we can't do anything
5817 if (parameters
->options().shared())
5818 return tls::TLSOPT_NONE
;
5822 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5823 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5824 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5825 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5826 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5827 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5828 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5829 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5830 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5831 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5832 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5833 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5834 // These are General-Dynamic which permits fully general TLS
5835 // access. Since we know that we are generating an executable,
5836 // we can convert this to Initial-Exec. If we also know that
5837 // this is a local symbol, we can further switch to Local-Exec.
5839 return tls::TLSOPT_TO_LE
;
5840 return tls::TLSOPT_TO_IE
;
5842 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5843 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5844 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5845 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5846 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5847 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5848 // These are Local-Dynamic, which refer to local symbols in the
5849 // dynamic TLS block. Since we know that we generating an
5850 // executable, we can switch to Local-Exec.
5851 return tls::TLSOPT_TO_LE
;
5853 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5854 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5855 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5856 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5857 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5858 // These are Initial-Exec relocs which get the thread offset
5859 // from the GOT. If we know that we are linking against the
5860 // local symbol, we can switch to Local-Exec, which links the
5861 // thread offset into the instruction.
5863 return tls::TLSOPT_TO_LE
;
5864 return tls::TLSOPT_NONE
;
5866 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5867 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5868 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5869 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5870 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5871 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5872 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5873 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5874 // When we already have Local-Exec, there is nothing further we
5876 return tls::TLSOPT_NONE
;
5883 // Returns true if this relocation type could be that of a function pointer.
5885 template<int size
, bool big_endian
>
5887 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5888 unsigned int r_type
)
5892 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5893 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5894 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5895 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5896 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5904 // For safe ICF, scan a relocation for a local symbol to check if it
5905 // corresponds to a function pointer being taken. In that case mark
5906 // the function whose pointer was taken as not foldable.
5908 template<int size
, bool big_endian
>
5910 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5913 Target_aarch64
<size
, big_endian
>* ,
5914 Sized_relobj_file
<size
, big_endian
>* ,
5917 const elfcpp::Rela
<size
, big_endian
>& ,
5918 unsigned int r_type
,
5919 const elfcpp::Sym
<size
, big_endian
>&)
5921 // When building a shared library, do not fold any local symbols.
5922 return (parameters
->options().shared()
5923 || possible_function_pointer_reloc(r_type
));
5926 // For safe ICF, scan a relocation for a global symbol to check if it
5927 // corresponds to a function pointer being taken. In that case mark
5928 // the function whose pointer was taken as not foldable.
5930 template<int size
, bool big_endian
>
5932 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5935 Target_aarch64
<size
, big_endian
>* ,
5936 Sized_relobj_file
<size
, big_endian
>* ,
5939 const elfcpp::Rela
<size
, big_endian
>& ,
5940 unsigned int r_type
,
5943 // When building a shared library, do not fold symbols whose visibility
5944 // is hidden, internal or protected.
5945 return ((parameters
->options().shared()
5946 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5947 || gsym
->visibility() == elfcpp::STV_PROTECTED
5948 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5949 || possible_function_pointer_reloc(r_type
));
5952 // Report an unsupported relocation against a local symbol.
5954 template<int size
, bool big_endian
>
5956 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
5957 Sized_relobj_file
<size
, big_endian
>* object
,
5958 unsigned int r_type
)
5960 gold_error(_("%s: unsupported reloc %u against local symbol"),
5961 object
->name().c_str(), r_type
);
5964 // We are about to emit a dynamic relocation of type R_TYPE. If the
5965 // dynamic linker does not support it, issue an error.
5967 template<int size
, bool big_endian
>
5969 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
5970 unsigned int r_type
)
5972 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
5976 // These are the relocation types supported by glibc for AARCH64.
5977 case elfcpp::R_AARCH64_NONE
:
5978 case elfcpp::R_AARCH64_COPY
:
5979 case elfcpp::R_AARCH64_GLOB_DAT
:
5980 case elfcpp::R_AARCH64_JUMP_SLOT
:
5981 case elfcpp::R_AARCH64_RELATIVE
:
5982 case elfcpp::R_AARCH64_TLS_DTPREL64
:
5983 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
5984 case elfcpp::R_AARCH64_TLS_TPREL64
:
5985 case elfcpp::R_AARCH64_TLSDESC
:
5986 case elfcpp::R_AARCH64_IRELATIVE
:
5987 case elfcpp::R_AARCH64_ABS32
:
5988 case elfcpp::R_AARCH64_ABS64
:
5995 // This prevents us from issuing more than one error per reloc
5996 // section. But we can still wind up issuing more than one
5997 // error per object file.
5998 if (this->issued_non_pic_error_
)
6000 gold_assert(parameters
->options().output_is_position_independent());
6001 object
->error(_("requires unsupported dynamic reloc; "
6002 "recompile with -fPIC"));
6003 this->issued_non_pic_error_
= true;
6007 // Return whether we need to make a PLT entry for a relocation of the
6008 // given type against a STT_GNU_IFUNC symbol.
6010 template<int size
, bool big_endian
>
6012 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
6013 Sized_relobj_file
<size
, big_endian
>* object
,
6014 unsigned int r_type
)
6016 const AArch64_reloc_property
* arp
=
6017 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6018 gold_assert(arp
!= NULL
);
6020 int flags
= arp
->reference_flags();
6021 if (flags
& Symbol::TLS_REF
)
6023 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
6024 object
->name().c_str(), arp
->name().c_str());
6030 // Scan a relocation for a local symbol.
6032 template<int size
, bool big_endian
>
6034 Target_aarch64
<size
, big_endian
>::Scan::local(
6035 Symbol_table
* symtab
,
6037 Target_aarch64
<size
, big_endian
>* target
,
6038 Sized_relobj_file
<size
, big_endian
>* object
,
6039 unsigned int data_shndx
,
6040 Output_section
* output_section
,
6041 const elfcpp::Rela
<size
, big_endian
>& rela
,
6042 unsigned int r_type
,
6043 const elfcpp::Sym
<size
, big_endian
>& lsym
,
6049 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6051 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6053 // A local STT_GNU_IFUNC symbol may require a PLT entry.
6054 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
6055 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
6056 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
6060 case elfcpp::R_AARCH64_NONE
:
6063 case elfcpp::R_AARCH64_ABS32
:
6064 case elfcpp::R_AARCH64_ABS16
:
6065 if (parameters
->options().output_is_position_independent())
6067 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6068 object
->name().c_str(), r_type
);
6072 case elfcpp::R_AARCH64_ABS64
:
6073 // If building a shared library or pie, we need to mark this as a dynmic
6074 // reloction, so that the dynamic loader can relocate it.
6075 if (parameters
->options().output_is_position_independent())
6077 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6078 rela_dyn
->add_local_relative(object
, r_sym
,
6079 elfcpp::R_AARCH64_RELATIVE
,
6082 rela
.get_r_offset(),
6083 rela
.get_r_addend(),
6088 case elfcpp::R_AARCH64_PREL64
:
6089 case elfcpp::R_AARCH64_PREL32
:
6090 case elfcpp::R_AARCH64_PREL16
:
6093 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6094 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6095 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6096 // The above relocations are used to access GOT entries.
6098 Output_data_got_aarch64
<size
, big_endian
>* got
=
6099 target
->got_section(symtab
, layout
);
6100 bool is_new
= false;
6101 // This symbol requires a GOT entry.
6103 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
6105 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
6106 if (is_new
&& parameters
->options().output_is_position_independent())
6107 target
->rela_dyn_section(layout
)->
6108 add_local_relative(object
,
6110 elfcpp::R_AARCH64_RELATIVE
,
6112 object
->local_got_offset(r_sym
,
6119 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6120 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6121 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6122 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6123 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6124 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6125 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6126 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6127 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6128 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6129 if (parameters
->options().output_is_position_independent())
6131 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6132 object
->name().c_str(), r_type
);
6136 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6137 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6138 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6139 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6140 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6141 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6142 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6143 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6144 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6145 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6148 // Control flow, pc-relative. We don't need to do anything for a relative
6149 // addressing relocation against a local symbol if it does not reference
6151 case elfcpp::R_AARCH64_TSTBR14
:
6152 case elfcpp::R_AARCH64_CONDBR19
:
6153 case elfcpp::R_AARCH64_JUMP26
:
6154 case elfcpp::R_AARCH64_CALL26
:
6157 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6158 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6160 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6161 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6162 if (tlsopt
== tls::TLSOPT_TO_LE
)
6165 layout
->set_has_static_tls();
6166 // Create a GOT entry for the tp-relative offset.
6167 if (!parameters
->doing_static_link())
6169 Output_data_got_aarch64
<size
, big_endian
>* got
=
6170 target
->got_section(symtab
, layout
);
6171 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
6172 target
->rela_dyn_section(layout
),
6173 elfcpp::R_AARCH64_TLS_TPREL64
);
6175 else if (!object
->local_has_got_offset(r_sym
,
6176 GOT_TYPE_TLS_OFFSET
))
6178 Output_data_got_aarch64
<size
, big_endian
>* got
=
6179 target
->got_section(symtab
, layout
);
6180 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
6181 unsigned int got_offset
=
6182 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
6183 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6184 gold_assert(addend
== 0);
6185 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
6191 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6192 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6194 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6195 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6196 if (tlsopt
== tls::TLSOPT_TO_LE
)
6198 layout
->set_has_static_tls();
6201 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6203 Output_data_got_aarch64
<size
, big_endian
>* got
=
6204 target
->got_section(symtab
, layout
);
6205 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
6207 target
->rela_dyn_section(layout
),
6208 elfcpp::R_AARCH64_TLS_DTPMOD64
);
6212 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6213 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6214 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6215 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6216 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6217 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6218 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6219 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6221 layout
->set_has_static_tls();
6222 bool output_is_shared
= parameters
->options().shared();
6223 if (output_is_shared
)
6224 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6225 object
->name().c_str(), r_type
);
6229 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6230 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6232 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6233 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6234 if (tlsopt
== tls::TLSOPT_NONE
)
6236 // Create a GOT entry for the module index.
6237 target
->got_mod_index_entry(symtab
, layout
, object
);
6239 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6240 unsupported_reloc_local(object
, r_type
);
6244 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6245 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6246 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6247 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6250 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6251 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6252 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6254 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6255 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6256 target
->define_tls_base_symbol(symtab
, layout
);
6257 if (tlsopt
== tls::TLSOPT_NONE
)
6259 // Create reserved PLT and GOT entries for the resolver.
6260 target
->reserve_tlsdesc_entries(symtab
, layout
);
6262 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6263 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6264 // entry needs to be in an area in .got.plt, not .got. Call
6265 // got_section to make sure the section has been created.
6266 target
->got_section(symtab
, layout
);
6267 Output_data_got
<size
, big_endian
>* got
=
6268 target
->got_tlsdesc_section();
6269 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6270 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
6272 unsigned int got_offset
= got
->add_constant(0);
6273 got
->add_constant(0);
6274 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
6276 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6277 // We store the arguments we need in a vector, and use
6278 // the index into the vector as the parameter to pass
6279 // to the target specific routines.
6280 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6281 void* arg
= reinterpret_cast<void*>(intarg
);
6282 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6283 got
, got_offset
, 0);
6286 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6287 unsupported_reloc_local(object
, r_type
);
6291 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6295 unsupported_reloc_local(object
, r_type
);
6300 // Report an unsupported relocation against a global symbol.
6302 template<int size
, bool big_endian
>
6304 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6305 Sized_relobj_file
<size
, big_endian
>* object
,
6306 unsigned int r_type
,
6309 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6310 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6313 template<int size
, bool big_endian
>
6315 Target_aarch64
<size
, big_endian
>::Scan::global(
6316 Symbol_table
* symtab
,
6318 Target_aarch64
<size
, big_endian
>* target
,
6319 Sized_relobj_file
<size
, big_endian
> * object
,
6320 unsigned int data_shndx
,
6321 Output_section
* output_section
,
6322 const elfcpp::Rela
<size
, big_endian
>& rela
,
6323 unsigned int r_type
,
6326 // A STT_GNU_IFUNC symbol may require a PLT entry.
6327 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6328 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6329 target
->make_plt_entry(symtab
, layout
, gsym
);
6331 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6333 const AArch64_reloc_property
* arp
=
6334 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6335 gold_assert(arp
!= NULL
);
6339 case elfcpp::R_AARCH64_NONE
:
6342 case elfcpp::R_AARCH64_ABS16
:
6343 case elfcpp::R_AARCH64_ABS32
:
6344 case elfcpp::R_AARCH64_ABS64
:
6346 // Make a PLT entry if necessary.
6347 if (gsym
->needs_plt_entry())
6349 target
->make_plt_entry(symtab
, layout
, gsym
);
6350 // Since this is not a PC-relative relocation, we may be
6351 // taking the address of a function. In that case we need to
6352 // set the entry in the dynamic symbol table to the address of
6354 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6355 gsym
->set_needs_dynsym_value();
6357 // Make a dynamic relocation if necessary.
6358 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6360 if (!parameters
->options().output_is_position_independent()
6361 && gsym
->may_need_copy_reloc())
6363 target
->copy_reloc(symtab
, layout
, object
,
6364 data_shndx
, output_section
, gsym
, rela
);
6366 else if (r_type
== elfcpp::R_AARCH64_ABS64
6367 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6368 && gsym
->can_use_relative_reloc(false)
6369 && !gsym
->is_from_dynobj()
6370 && !gsym
->is_undefined()
6371 && !gsym
->is_preemptible())
6373 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6374 // symbol. This makes a function address in a PIE executable
6375 // match the address in a shared library that it links against.
6376 Reloc_section
* rela_dyn
=
6377 target
->rela_irelative_section(layout
);
6378 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6379 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6380 output_section
, object
,
6382 rela
.get_r_offset(),
6383 rela
.get_r_addend());
6385 else if (r_type
== elfcpp::R_AARCH64_ABS64
6386 && gsym
->can_use_relative_reloc(false))
6388 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6389 rela_dyn
->add_global_relative(gsym
,
6390 elfcpp::R_AARCH64_RELATIVE
,
6394 rela
.get_r_offset(),
6395 rela
.get_r_addend(),
6400 check_non_pic(object
, r_type
);
6401 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6402 rela_dyn
= target
->rela_dyn_section(layout
);
6403 rela_dyn
->add_global(
6404 gsym
, r_type
, output_section
, object
,
6405 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6411 case elfcpp::R_AARCH64_PREL16
:
6412 case elfcpp::R_AARCH64_PREL32
:
6413 case elfcpp::R_AARCH64_PREL64
:
6414 // This is used to fill the GOT absolute address.
6415 if (gsym
->needs_plt_entry())
6417 target
->make_plt_entry(symtab
, layout
, gsym
);
6421 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6422 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6423 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6424 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6425 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6426 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6427 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6428 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6429 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6430 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6431 if (parameters
->options().output_is_position_independent())
6433 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6434 object
->name().c_str(), r_type
);
6438 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6439 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6440 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6441 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6442 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6443 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6444 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6445 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6446 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6447 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6449 if (gsym
->needs_plt_entry())
6450 target
->make_plt_entry(symtab
, layout
, gsym
);
6451 // Make a dynamic relocation if necessary.
6452 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6454 if (parameters
->options().output_is_executable()
6455 && gsym
->may_need_copy_reloc())
6457 target
->copy_reloc(symtab
, layout
, object
,
6458 data_shndx
, output_section
, gsym
, rela
);
6464 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6465 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6466 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6468 // The above relocations are used to access GOT entries.
6469 // Note a GOT entry is an *address* to a symbol.
6470 // The symbol requires a GOT entry
6471 Output_data_got_aarch64
<size
, big_endian
>* got
=
6472 target
->got_section(symtab
, layout
);
6473 if (gsym
->final_value_is_known())
6475 // For a STT_GNU_IFUNC symbol we want the PLT address.
6476 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6477 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6479 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6483 // If this symbol is not fully resolved, we need to add a dynamic
6484 // relocation for it.
6485 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6487 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6489 // 1) The symbol may be defined in some other module.
6490 // 2) We are building a shared library and this is a protected
6491 // symbol; using GLOB_DAT means that the dynamic linker can use
6492 // the address of the PLT in the main executable when appropriate
6493 // so that function address comparisons work.
6494 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6495 // again so that function address comparisons work.
6496 if (gsym
->is_from_dynobj()
6497 || gsym
->is_undefined()
6498 || gsym
->is_preemptible()
6499 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6500 && parameters
->options().shared())
6501 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6502 && parameters
->options().output_is_position_independent()))
6503 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6504 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6507 // For a STT_GNU_IFUNC symbol we want to write the PLT
6508 // offset into the GOT, so that function pointer
6509 // comparisons work correctly.
6511 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6512 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6515 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6516 // Tell the dynamic linker to use the PLT address
6517 // when resolving relocations.
6518 if (gsym
->is_from_dynobj()
6519 && !parameters
->options().shared())
6520 gsym
->set_needs_dynsym_value();
6524 rela_dyn
->add_global_relative(
6525 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6527 gsym
->got_offset(GOT_TYPE_STANDARD
),
6536 case elfcpp::R_AARCH64_TSTBR14
:
6537 case elfcpp::R_AARCH64_CONDBR19
:
6538 case elfcpp::R_AARCH64_JUMP26
:
6539 case elfcpp::R_AARCH64_CALL26
:
6541 if (gsym
->final_value_is_known())
6544 if (gsym
->is_defined() &&
6545 !gsym
->is_from_dynobj() &&
6546 !gsym
->is_preemptible())
6549 // Make plt entry for function call.
6550 target
->make_plt_entry(symtab
, layout
, gsym
);
6554 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6555 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6557 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6558 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6559 if (tlsopt
== tls::TLSOPT_TO_LE
)
6561 layout
->set_has_static_tls();
6564 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6567 Output_data_got_aarch64
<size
, big_endian
>* got
=
6568 target
->got_section(symtab
, layout
);
6569 // Create 2 consecutive entries for module index and offset.
6570 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6571 target
->rela_dyn_section(layout
),
6572 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6573 elfcpp::R_AARCH64_TLS_DTPREL64
);
6577 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6578 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6580 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6581 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6582 if (tlsopt
== tls::TLSOPT_NONE
)
6584 // Create a GOT entry for the module index.
6585 target
->got_mod_index_entry(symtab
, layout
, object
);
6587 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6588 unsupported_reloc_local(object
, r_type
);
6592 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6593 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6594 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6595 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6598 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6599 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6601 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6602 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6603 if (tlsopt
== tls::TLSOPT_TO_LE
)
6606 layout
->set_has_static_tls();
6607 // Create a GOT entry for the tp-relative offset.
6608 Output_data_got_aarch64
<size
, big_endian
>* got
6609 = target
->got_section(symtab
, layout
);
6610 if (!parameters
->doing_static_link())
6612 got
->add_global_with_rel(
6613 gsym
, GOT_TYPE_TLS_OFFSET
,
6614 target
->rela_dyn_section(layout
),
6615 elfcpp::R_AARCH64_TLS_TPREL64
);
6617 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6619 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6620 unsigned int got_offset
=
6621 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6622 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6623 gold_assert(addend
== 0);
6624 got
->add_static_reloc(got_offset
,
6625 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6630 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6631 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6632 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6633 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6634 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6635 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6636 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6637 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6638 layout
->set_has_static_tls();
6639 if (parameters
->options().shared())
6640 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6641 object
->name().c_str(), r_type
);
6644 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6645 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6646 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6648 target
->define_tls_base_symbol(symtab
, layout
);
6649 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6650 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6651 if (tlsopt
== tls::TLSOPT_NONE
)
6653 // Create reserved PLT and GOT entries for the resolver.
6654 target
->reserve_tlsdesc_entries(symtab
, layout
);
6656 // Create a double GOT entry with an R_AARCH64_TLSDESC
6657 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6658 // entry needs to be in an area in .got.plt, not .got. Call
6659 // got_section to make sure the section has been created.
6660 target
->got_section(symtab
, layout
);
6661 Output_data_got
<size
, big_endian
>* got
=
6662 target
->got_tlsdesc_section();
6663 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6664 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6665 elfcpp::R_AARCH64_TLSDESC
, 0);
6667 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6669 // Create a GOT entry for the tp-relative offset.
6670 Output_data_got
<size
, big_endian
>* got
6671 = target
->got_section(symtab
, layout
);
6672 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6673 target
->rela_dyn_section(layout
),
6674 elfcpp::R_AARCH64_TLS_TPREL64
);
6676 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6677 unsupported_reloc_global(object
, r_type
, gsym
);
6681 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6685 gold_error(_("%s: unsupported reloc type in global scan"),
6686 aarch64_reloc_property_table
->
6687 reloc_name_in_error_message(r_type
).c_str());
6690 } // End of Scan::global
6693 // Create the PLT section.
6694 template<int size
, bool big_endian
>
6696 Target_aarch64
<size
, big_endian
>::make_plt_section(
6697 Symbol_table
* symtab
, Layout
* layout
)
6699 if (this->plt_
== NULL
)
6701 // Create the GOT section first.
6702 this->got_section(symtab
, layout
);
6704 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6705 this->got_irelative_
);
6707 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6709 | elfcpp::SHF_EXECINSTR
),
6710 this->plt_
, ORDER_PLT
, false);
6712 // Make the sh_info field of .rela.plt point to .plt.
6713 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6714 rela_plt_os
->set_info_section(this->plt_
->output_section());
6718 // Return the section for TLSDESC relocations.
6720 template<int size
, bool big_endian
>
6721 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6722 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6724 return this->plt_section()->rela_tlsdesc(layout
);
6727 // Create a PLT entry for a global symbol.
6729 template<int size
, bool big_endian
>
6731 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6732 Symbol_table
* symtab
,
6736 if (gsym
->has_plt_offset())
6739 if (this->plt_
== NULL
)
6740 this->make_plt_section(symtab
, layout
);
6742 this->plt_
->add_entry(symtab
, layout
, gsym
);
6745 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6747 template<int size
, bool big_endian
>
6749 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6750 Symbol_table
* symtab
, Layout
* layout
,
6751 Sized_relobj_file
<size
, big_endian
>* relobj
,
6752 unsigned int local_sym_index
)
6754 if (relobj
->local_has_plt_offset(local_sym_index
))
6756 if (this->plt_
== NULL
)
6757 this->make_plt_section(symtab
, layout
);
6758 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6761 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6764 template<int size
, bool big_endian
>
6766 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6767 Symbol_table
* symtab
,
6769 Sized_relobj_file
<size
, big_endian
>* object
,
6770 unsigned int data_shndx
,
6771 unsigned int sh_type
,
6772 const unsigned char* prelocs
,
6774 Output_section
* output_section
,
6775 bool needs_special_offset_handling
,
6776 size_t local_symbol_count
,
6777 const unsigned char* plocal_symbols
)
6779 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6780 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6783 if (sh_type
== elfcpp::SHT_REL
)
6788 gold::gc_process_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6797 needs_special_offset_handling
,
6802 // Scan relocations for a section.
6804 template<int size
, bool big_endian
>
6806 Target_aarch64
<size
, big_endian
>::scan_relocs(
6807 Symbol_table
* symtab
,
6809 Sized_relobj_file
<size
, big_endian
>* object
,
6810 unsigned int data_shndx
,
6811 unsigned int sh_type
,
6812 const unsigned char* prelocs
,
6814 Output_section
* output_section
,
6815 bool needs_special_offset_handling
,
6816 size_t local_symbol_count
,
6817 const unsigned char* plocal_symbols
)
6819 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6820 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6823 if (sh_type
== elfcpp::SHT_REL
)
6825 gold_error(_("%s: unsupported REL reloc section"),
6826 object
->name().c_str());
6830 gold::scan_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6839 needs_special_offset_handling
,
6844 // Return the value to use for a dynamic which requires special
6845 // treatment. This is how we support equality comparisons of function
6846 // pointers across shared library boundaries, as described in the
6847 // processor specific ABI supplement.
6849 template<int size
, bool big_endian
>
6851 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6853 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6854 return this->plt_address_for_global(gsym
);
6858 // Finalize the sections.
6860 template<int size
, bool big_endian
>
6862 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6864 const Input_objects
*,
6865 Symbol_table
* symtab
)
6867 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6869 : this->plt_
->rela_plt());
6870 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6871 this->rela_dyn_
, true, false);
6873 // Emit any relocs we saved in an attempt to avoid generating COPY
6875 if (this->copy_relocs_
.any_saved_relocs())
6876 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6878 // Fill in some more dynamic tags.
6879 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6882 if (this->plt_
!= NULL
6883 && this->plt_
->output_section() != NULL
6884 && this->plt_
->has_tlsdesc_entry())
6886 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6887 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6888 this->got_
->finalize_data_size();
6889 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6890 this->plt_
, plt_offset
);
6891 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6892 this->got_
, got_offset
);
6896 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6897 // the .got.plt section.
6898 Symbol
* sym
= this->global_offset_table_
;
6901 uint64_t data_size
= this->got_plt_
->current_data_size();
6902 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6904 // If the .got section is more than 0x8000 bytes, we add
6905 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6906 // bit relocations have a greater chance of working.
6907 if (data_size
>= 0x8000)
6908 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6909 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6912 if (parameters
->doing_static_link()
6913 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6915 // If linking statically, make sure that the __rela_iplt symbols
6916 // were defined if necessary, even if we didn't create a PLT.
6917 static const Define_symbol_in_segment syms
[] =
6920 "__rela_iplt_start", // name
6921 elfcpp::PT_LOAD
, // segment_type
6922 elfcpp::PF_W
, // segment_flags_set
6923 elfcpp::PF(0), // segment_flags_clear
6926 elfcpp::STT_NOTYPE
, // type
6927 elfcpp::STB_GLOBAL
, // binding
6928 elfcpp::STV_HIDDEN
, // visibility
6930 Symbol::SEGMENT_START
, // offset_from_base
6934 "__rela_iplt_end", // name
6935 elfcpp::PT_LOAD
, // segment_type
6936 elfcpp::PF_W
, // segment_flags_set
6937 elfcpp::PF(0), // segment_flags_clear
6940 elfcpp::STT_NOTYPE
, // type
6941 elfcpp::STB_GLOBAL
, // binding
6942 elfcpp::STV_HIDDEN
, // visibility
6944 Symbol::SEGMENT_START
, // offset_from_base
6949 symtab
->define_symbols(layout
, 2, syms
,
6950 layout
->script_options()->saw_sections_clause());
6956 // Perform a relocation.
6958 template<int size
, bool big_endian
>
6960 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
6961 const Relocate_info
<size
, big_endian
>* relinfo
,
6963 Target_aarch64
<size
, big_endian
>* target
,
6966 const unsigned char* preloc
,
6967 const Sized_symbol
<size
>* gsym
,
6968 const Symbol_value
<size
>* psymval
,
6969 unsigned char* view
,
6970 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
6971 section_size_type
/* view_size */)
6976 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
6978 const elfcpp::Rela
<size
, big_endian
> rela(preloc
);
6979 unsigned int r_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
6980 const AArch64_reloc_property
* reloc_property
=
6981 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6983 if (reloc_property
== NULL
)
6985 std::string reloc_name
=
6986 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
6987 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6988 _("cannot relocate %s in object file"),
6989 reloc_name
.c_str());
6993 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6995 // Pick the value to use for symbols defined in the PLT.
6996 Symbol_value
<size
> symval
;
6998 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
7000 symval
.set_output_value(target
->plt_address_for_global(gsym
));
7003 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
7005 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7006 if (object
->local_has_plt_offset(r_sym
))
7008 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
7013 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7015 // Get the GOT offset if needed.
7016 // For aarch64, the GOT pointer points to the start of the GOT section.
7017 bool have_got_offset
= false;
7019 int got_base
= (target
->got_
!= NULL
7020 ? (target
->got_
->current_data_size() >= 0x8000
7025 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
7026 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
7027 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
7028 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
7029 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
7030 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
7031 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
7032 case elfcpp::R_AARCH64_GOTREL64
:
7033 case elfcpp::R_AARCH64_GOTREL32
:
7034 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
7035 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
7036 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7037 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7038 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7041 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
7042 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
7046 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7047 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
7048 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
7051 have_got_offset
= true;
7058 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
7059 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
7062 case elfcpp::R_AARCH64_NONE
:
7065 case elfcpp::R_AARCH64_ABS64
:
7066 if (!parameters
->options().apply_dynamic_relocs()
7067 && parameters
->options().output_is_position_independent()
7069 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags())
7070 && !gsym
->can_use_relative_reloc(false))
7071 // We have generated an absolute dynamic relocation, so do not
7072 // apply the relocation statically. (Works around bugs in older
7073 // Android dynamic linkers.)
7075 reloc_status
= Reloc::template rela_ua
<64>(
7076 view
, object
, psymval
, addend
, reloc_property
);
7079 case elfcpp::R_AARCH64_ABS32
:
7080 if (!parameters
->options().apply_dynamic_relocs()
7081 && parameters
->options().output_is_position_independent()
7083 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7084 // We have generated an absolute dynamic relocation, so do not
7085 // apply the relocation statically. (Works around bugs in older
7086 // Android dynamic linkers.)
7088 reloc_status
= Reloc::template rela_ua
<32>(
7089 view
, object
, psymval
, addend
, reloc_property
);
7092 case elfcpp::R_AARCH64_ABS16
:
7093 if (!parameters
->options().apply_dynamic_relocs()
7094 && parameters
->options().output_is_position_independent()
7096 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7097 // We have generated an absolute dynamic relocation, so do not
7098 // apply the relocation statically. (Works around bugs in older
7099 // Android dynamic linkers.)
7101 reloc_status
= Reloc::template rela_ua
<16>(
7102 view
, object
, psymval
, addend
, reloc_property
);
7105 case elfcpp::R_AARCH64_PREL64
:
7106 reloc_status
= Reloc::template pcrela_ua
<64>(
7107 view
, object
, psymval
, addend
, address
, reloc_property
);
7110 case elfcpp::R_AARCH64_PREL32
:
7111 reloc_status
= Reloc::template pcrela_ua
<32>(
7112 view
, object
, psymval
, addend
, address
, reloc_property
);
7115 case elfcpp::R_AARCH64_PREL16
:
7116 reloc_status
= Reloc::template pcrela_ua
<16>(
7117 view
, object
, psymval
, addend
, address
, reloc_property
);
7120 case elfcpp::R_AARCH64_MOVW_UABS_G0
:
7121 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
:
7122 case elfcpp::R_AARCH64_MOVW_UABS_G1
:
7123 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
:
7124 case elfcpp::R_AARCH64_MOVW_UABS_G2
:
7125 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
:
7126 case elfcpp::R_AARCH64_MOVW_UABS_G3
:
7127 reloc_status
= Reloc::template rela_general
<32>(
7128 view
, object
, psymval
, addend
, reloc_property
);
7130 case elfcpp::R_AARCH64_MOVW_SABS_G0
:
7131 case elfcpp::R_AARCH64_MOVW_SABS_G1
:
7132 case elfcpp::R_AARCH64_MOVW_SABS_G2
:
7133 reloc_status
= Reloc::movnz(view
, psymval
->value(object
, addend
),
7137 case elfcpp::R_AARCH64_LD_PREL_LO19
:
7138 reloc_status
= Reloc::template pcrela_general
<32>(
7139 view
, object
, psymval
, addend
, address
, reloc_property
);
7142 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
7143 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
7144 address
, reloc_property
);
7147 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
7148 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
7149 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
7153 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
7154 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
7155 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
7156 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
7157 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
7158 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
7159 reloc_status
= Reloc::template rela_general
<32>(
7160 view
, object
, psymval
, addend
, reloc_property
);
7163 case elfcpp::R_AARCH64_CALL26
:
7164 if (this->skip_call_tls_get_addr_
)
7166 // Double check that the TLSGD insn has been optimized away.
7167 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7168 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
7169 reinterpret_cast<Insntype
*>(view
));
7170 gold_assert((insn
& 0xff000000) == 0x91000000);
7172 reloc_status
= Reloc::STATUS_OKAY
;
7173 this->skip_call_tls_get_addr_
= false;
7174 // Return false to stop further processing this reloc.
7178 case elfcpp::R_AARCH64_JUMP26
:
7179 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
7180 gsym
, psymval
, object
,
7181 target
->stub_group_size_
))
7184 case elfcpp::R_AARCH64_TSTBR14
:
7185 case elfcpp::R_AARCH64_CONDBR19
:
7186 reloc_status
= Reloc::template pcrela_general
<32>(
7187 view
, object
, psymval
, addend
, address
, reloc_property
);
7190 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7191 gold_assert(have_got_offset
);
7192 value
= target
->got_
->address() + got_base
+ got_offset
;
7193 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
7196 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7197 gold_assert(have_got_offset
);
7198 value
= target
->got_
->address() + got_base
+ got_offset
;
7199 reloc_status
= Reloc::template rela_general
<32>(
7200 view
, value
, addend
, reloc_property
);
7203 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7205 gold_assert(have_got_offset
);
7206 value
= target
->got_
->address() + got_base
+ got_offset
+ addend
-
7207 Reloc::Page(target
->got_
->address() + got_base
);
7208 if ((value
& 7) != 0)
7209 reloc_status
= Reloc::STATUS_OVERFLOW
;
7211 reloc_status
= Reloc::template reloc_common
<32>(
7212 view
, value
, reloc_property
);
7216 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7217 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7218 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7219 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7220 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7221 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7222 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7223 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7224 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7225 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7226 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7227 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7228 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7229 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7230 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7231 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7232 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7233 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7234 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7235 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7236 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7237 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7238 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
7239 gsym
, psymval
, view
, address
);
7242 // These are dynamic relocations, which are unexpected when linking.
7243 case elfcpp::R_AARCH64_COPY
:
7244 case elfcpp::R_AARCH64_GLOB_DAT
:
7245 case elfcpp::R_AARCH64_JUMP_SLOT
:
7246 case elfcpp::R_AARCH64_RELATIVE
:
7247 case elfcpp::R_AARCH64_IRELATIVE
:
7248 case elfcpp::R_AARCH64_TLS_DTPREL64
:
7249 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
7250 case elfcpp::R_AARCH64_TLS_TPREL64
:
7251 case elfcpp::R_AARCH64_TLSDESC
:
7252 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7253 _("unexpected reloc %u in object file"),
7258 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7259 _("unsupported reloc %s"),
7260 reloc_property
->name().c_str());
7264 // Report any errors.
7265 switch (reloc_status
)
7267 case Reloc::STATUS_OKAY
:
7269 case Reloc::STATUS_OVERFLOW
:
7270 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7271 _("relocation overflow in %s"),
7272 reloc_property
->name().c_str());
7274 case Reloc::STATUS_BAD_RELOC
:
7275 gold_error_at_location(
7278 rela
.get_r_offset(),
7279 _("unexpected opcode while processing relocation %s"),
7280 reloc_property
->name().c_str());
7290 template<int size
, bool big_endian
>
7292 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7293 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
7294 const Relocate_info
<size
, big_endian
>* relinfo
,
7295 Target_aarch64
<size
, big_endian
>* target
,
7297 const elfcpp::Rela
<size
, big_endian
>& rela
,
7298 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
7299 const Symbol_value
<size
>* psymval
,
7300 unsigned char* view
,
7301 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7303 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7304 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7306 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7307 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7308 const AArch64_reloc_property
* reloc_property
=
7309 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7310 gold_assert(reloc_property
!= NULL
);
7312 const bool is_final
= (gsym
== NULL
7313 ? !parameters
->options().shared()
7314 : gsym
->final_value_is_known());
7315 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
7316 optimize_tls_reloc(is_final
, r_type
);
7318 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7319 int tls_got_offset_type
;
7322 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7323 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
7325 if (tlsopt
== tls::TLSOPT_TO_LE
)
7327 if (tls_segment
== NULL
)
7329 gold_assert(parameters
->errors()->error_count() > 0
7330 || issue_undefined_symbol_error(gsym
));
7331 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7333 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
7336 else if (tlsopt
== tls::TLSOPT_NONE
)
7338 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
7339 // Firstly get the address for the got entry.
7340 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7343 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7344 got_entry_address
= target
->got_
->address() +
7345 gsym
->got_offset(tls_got_offset_type
);
7349 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7351 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7352 got_entry_address
= target
->got_
->address() +
7353 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7356 // Relocate the address into adrp/ld, adrp/add pair.
7359 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7360 return aarch64_reloc_funcs::adrp(
7361 view
, got_entry_address
+ addend
, address
);
7365 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7366 return aarch64_reloc_funcs::template rela_general
<32>(
7367 view
, got_entry_address
, addend
, reloc_property
);
7374 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7375 _("unsupported gd_to_ie relaxation on %u"),
7380 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7381 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7383 if (tlsopt
== tls::TLSOPT_TO_LE
)
7385 if (tls_segment
== NULL
)
7387 gold_assert(parameters
->errors()->error_count() > 0
7388 || issue_undefined_symbol_error(gsym
));
7389 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7391 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7395 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7396 // Relocate the field with the offset of the GOT entry for
7397 // the module index.
7398 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7399 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7400 target
->got_
->address());
7404 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7405 return aarch64_reloc_funcs::adrp(
7406 view
, got_entry_address
+ addend
, address
);
7409 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7410 return aarch64_reloc_funcs::template rela_general
<32>(
7411 view
, got_entry_address
, addend
, reloc_property
);
7420 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7421 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7422 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7423 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7425 AArch64_address value
= psymval
->value(object
, 0);
7426 if (tlsopt
== tls::TLSOPT_TO_LE
)
7428 if (tls_segment
== NULL
)
7430 gold_assert(parameters
->errors()->error_count() > 0
7431 || issue_undefined_symbol_error(gsym
));
7432 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7437 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7438 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7442 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7443 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7444 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7445 return aarch64_reloc_funcs::template rela_general
<32>(
7446 view
, value
, addend
, reloc_property
);
7452 // We should never reach here.
7456 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7457 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7459 if (tlsopt
== tls::TLSOPT_TO_LE
)
7461 if (tls_segment
== NULL
)
7463 gold_assert(parameters
->errors()->error_count() > 0
7464 || issue_undefined_symbol_error(gsym
));
7465 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7467 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7470 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7472 // Firstly get the address for the got entry.
7473 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7476 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7477 got_entry_address
= target
->got_
->address() +
7478 gsym
->got_offset(tls_got_offset_type
);
7482 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7484 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7485 got_entry_address
= target
->got_
->address() +
7486 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7488 // Relocate the address into adrp/ld, adrp/add pair.
7491 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7492 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7495 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7496 return aarch64_reloc_funcs::template rela_general
<32>(
7497 view
, got_entry_address
, addend
, reloc_property
);
7502 // We shall never reach here.
7505 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7506 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7507 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7508 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7509 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7510 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7511 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7512 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7514 gold_assert(tls_segment
!= NULL
);
7515 AArch64_address value
= psymval
->value(object
, 0);
7517 if (!parameters
->options().shared())
7519 AArch64_address aligned_tcb_size
=
7520 align_address(target
->tcb_size(),
7521 tls_segment
->maximum_alignment());
7522 value
+= aligned_tcb_size
;
7525 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7526 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7527 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7528 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7531 return aarch64_reloc_funcs::template
7532 rela_general
<32>(view
,
7539 gold_error(_("%s: unsupported reloc %u "
7540 "in non-static TLSLE mode."),
7541 object
->name().c_str(), r_type
);
7545 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7546 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7547 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7548 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7550 if (tlsopt
== tls::TLSOPT_TO_LE
)
7552 if (tls_segment
== NULL
)
7554 gold_assert(parameters
->errors()->error_count() > 0
7555 || issue_undefined_symbol_error(gsym
));
7556 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7558 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7563 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7564 ? GOT_TYPE_TLS_OFFSET
7565 : GOT_TYPE_TLS_DESC
);
7566 unsigned int got_tlsdesc_offset
= 0;
7567 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7568 && tlsopt
== tls::TLSOPT_NONE
)
7570 // We created GOT entries in the .got.tlsdesc portion of the
7571 // .got.plt section, but the offset stored in the symbol is the
7572 // offset within .got.tlsdesc.
7573 got_tlsdesc_offset
= (target
->got_
->data_size()
7574 + target
->got_plt_section()->data_size());
7576 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7579 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7580 got_entry_address
= target
->got_
->address()
7581 + got_tlsdesc_offset
7582 + gsym
->got_offset(tls_got_offset_type
);
7586 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7588 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7589 got_entry_address
= target
->got_
->address() +
7590 got_tlsdesc_offset
+
7591 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7593 if (tlsopt
== tls::TLSOPT_TO_IE
)
7595 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7596 view
, psymval
, got_entry_address
,
7600 // Now do tlsdesc relocation.
7603 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7604 return aarch64_reloc_funcs::adrp(view
,
7605 got_entry_address
+ addend
,
7608 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7609 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7610 return aarch64_reloc_funcs::template rela_general
<32>(
7611 view
, got_entry_address
, addend
, reloc_property
);
7613 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7614 return aarch64_reloc_funcs::STATUS_OKAY
;
7624 gold_error(_("%s: unsupported TLS reloc %u."),
7625 object
->name().c_str(), r_type
);
7627 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7628 } // End of relocate_tls.
7631 template<int size
, bool big_endian
>
7633 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7634 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7635 const Relocate_info
<size
, big_endian
>* relinfo
,
7636 Target_aarch64
<size
, big_endian
>* target
,
7637 const elfcpp::Rela
<size
, big_endian
>& rela
,
7638 unsigned int r_type
,
7639 unsigned char* view
,
7640 const Symbol_value
<size
>* psymval
)
7642 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7643 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7644 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7646 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7647 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7648 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7649 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7651 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7653 // This is the 2nd relocs, optimization should already have been
7655 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7656 return aarch64_reloc_funcs::STATUS_OKAY
;
7659 // The original sequence is -
7660 // 90000000 adrp x0, 0 <main>
7661 // 91000000 add x0, x0, #0x0
7662 // 94000000 bl 0 <__tls_get_addr>
7663 // optimized to sequence -
7664 // d53bd040 mrs x0, tpidr_el0
7665 // 91400000 add x0, x0, #0x0, lsl #12
7666 // 91000000 add x0, x0, #0x0
7668 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7669 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7670 // have to change "bl tls_get_addr", which does not have a corresponding tls
7671 // relocation type. So before proceeding, we need to make sure compiler
7672 // does not change the sequence.
7673 if(!(insn1
== 0x90000000 // adrp x0,0
7674 && insn2
== 0x91000000 // add x0, x0, #0x0
7675 && insn3
== 0x94000000)) // bl 0
7677 // Ideally we should give up gd_to_le relaxation and do gd access.
7678 // However the gd_to_le relaxation decision has been made early
7679 // in the scan stage, where we did not allocate any GOT entry for
7680 // this symbol. Therefore we have to exit and report error now.
7681 gold_error(_("unexpected reloc insn sequence while relaxing "
7682 "tls gd to le for reloc %u."), r_type
);
7683 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7687 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7688 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7689 insn3
= 0x91000000; // add x0, x0, #0x0
7690 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7691 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7692 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7694 // Calculate tprel value.
7695 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7696 gold_assert(tls_segment
!= NULL
);
7697 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7698 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7699 AArch64_address aligned_tcb_size
=
7700 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7701 AArch64_address x
= value
+ aligned_tcb_size
;
7703 // After new insns are written, apply TLSLE relocs.
7704 const AArch64_reloc_property
* rp1
=
7705 aarch64_reloc_property_table
->get_reloc_property(
7706 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7707 const AArch64_reloc_property
* rp2
=
7708 aarch64_reloc_property_table
->get_reloc_property(
7709 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7710 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7712 typename
aarch64_reloc_funcs::Status s1
=
7713 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7717 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7720 typename
aarch64_reloc_funcs::Status s2
=
7721 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7726 this->skip_call_tls_get_addr_
= true;
7728 } // End of tls_gd_to_le
7731 template<int size
, bool big_endian
>
7733 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7734 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7735 const Relocate_info
<size
, big_endian
>* relinfo
,
7736 Target_aarch64
<size
, big_endian
>* target
,
7737 const elfcpp::Rela
<size
, big_endian
>& rela
,
7738 unsigned int r_type
,
7739 unsigned char* view
,
7740 const Symbol_value
<size
>* psymval
)
7742 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7743 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7744 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7746 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7747 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7748 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7749 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7751 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7753 // This is the 2nd relocs, optimization should already have been
7755 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7756 return aarch64_reloc_funcs::STATUS_OKAY
;
7759 // The original sequence is -
7760 // 90000000 adrp x0, 0 <main>
7761 // 91000000 add x0, x0, #0x0
7762 // 94000000 bl 0 <__tls_get_addr>
7763 // optimized to sequence -
7764 // d53bd040 mrs x0, tpidr_el0
7765 // 91400000 add x0, x0, #0x0, lsl #12
7766 // 91000000 add x0, x0, #0x0
7768 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7769 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7770 // have to change "bl tls_get_addr", which does not have a corresponding tls
7771 // relocation type. So before proceeding, we need to make sure compiler
7772 // does not change the sequence.
7773 if(!(insn1
== 0x90000000 // adrp x0,0
7774 && insn2
== 0x91000000 // add x0, x0, #0x0
7775 && insn3
== 0x94000000)) // bl 0
7777 // Ideally we should give up gd_to_le relaxation and do gd access.
7778 // However the gd_to_le relaxation decision has been made early
7779 // in the scan stage, where we did not allocate a GOT entry for
7780 // this symbol. Therefore we have to exit and report an error now.
7781 gold_error(_("unexpected reloc insn sequence while relaxing "
7782 "tls gd to le for reloc %u."), r_type
);
7783 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7787 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7788 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7789 insn3
= 0x91000000; // add x0, x0, #0x0
7790 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7791 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7792 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7794 // Calculate tprel value.
7795 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7796 gold_assert(tls_segment
!= NULL
);
7797 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7798 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7799 AArch64_address aligned_tcb_size
=
7800 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7801 AArch64_address x
= value
+ aligned_tcb_size
;
7803 // After new insns are written, apply TLSLE relocs.
7804 const AArch64_reloc_property
* rp1
=
7805 aarch64_reloc_property_table
->get_reloc_property(
7806 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7807 const AArch64_reloc_property
* rp2
=
7808 aarch64_reloc_property_table
->get_reloc_property(
7809 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7810 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7812 typename
aarch64_reloc_funcs::Status s1
=
7813 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7817 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7820 typename
aarch64_reloc_funcs::Status s2
=
7821 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7826 this->skip_call_tls_get_addr_
= true;
7829 } // End of tls_ld_to_le
7831 template<int size
, bool big_endian
>
7833 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7834 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7835 const Relocate_info
<size
, big_endian
>* relinfo
,
7836 Target_aarch64
<size
, big_endian
>* target
,
7837 const elfcpp::Rela
<size
, big_endian
>& rela
,
7838 unsigned int r_type
,
7839 unsigned char* view
,
7840 const Symbol_value
<size
>* psymval
)
7842 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7843 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7844 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7846 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7847 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7848 AArch64_address aligned_tcb_address
=
7849 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7850 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7851 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7852 // "x" is the offset to tp, we can only do this if x is within
7853 // range [0, 2^32-1]
7854 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7856 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7858 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7861 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7862 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7865 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7868 regno
= (insn
& 0x1f);
7869 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7871 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7874 regno
= (insn
& 0x1f);
7875 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7876 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7881 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7882 return aarch64_reloc_funcs::STATUS_OKAY
;
7883 } // End of tls_ie_to_le
7886 template<int size
, bool big_endian
>
7888 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7889 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7890 const Relocate_info
<size
, big_endian
>* relinfo
,
7891 Target_aarch64
<size
, big_endian
>* target
,
7892 const elfcpp::Rela
<size
, big_endian
>& rela
,
7893 unsigned int r_type
,
7894 unsigned char* view
,
7895 const Symbol_value
<size
>* psymval
)
7897 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7898 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7899 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7901 // TLSDESC-GD sequence is like:
7902 // adrp x0, :tlsdesc:v1
7903 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7904 // add x0, x0, :tlsdesc_lo12:v1
7907 // After desc_gd_to_le optimization, the sequence will be like:
7908 // movz x0, #0x0, lsl #16
7913 // Calculate tprel value.
7914 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7915 gold_assert(tls_segment
!= NULL
);
7916 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7917 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7918 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7919 AArch64_address aligned_tcb_size
=
7920 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7921 AArch64_address x
= value
+ aligned_tcb_size
;
7922 // x is the offset to tp, we can only do this if x is within range
7923 // [0, 2^32-1]. If x is out of range, fail and exit.
7924 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7926 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7927 "We Can't do gd_to_le relaxation.\n"), r_type
);
7928 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7933 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7934 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7936 newinsn
= 0xd503201f;
7939 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7941 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7944 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7946 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7950 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7954 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7955 return aarch64_reloc_funcs::STATUS_OKAY
;
7956 } // End of tls_desc_gd_to_le
7959 template<int size
, bool big_endian
>
7961 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7962 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
7963 const Relocate_info
<size
, big_endian
>* /* relinfo */,
7964 Target_aarch64
<size
, big_endian
>* /* target */,
7965 const elfcpp::Rela
<size
, big_endian
>& rela
,
7966 unsigned int r_type
,
7967 unsigned char* view
,
7968 const Symbol_value
<size
>* /* psymval */,
7969 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
7970 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7972 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7973 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7975 // TLSDESC-GD sequence is like:
7976 // adrp x0, :tlsdesc:v1
7977 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7978 // add x0, x0, :tlsdesc_lo12:v1
7981 // After desc_gd_to_ie optimization, the sequence will be like:
7982 // adrp x0, :tlsie:v1
7983 // ldr x0, [x0, :tlsie_lo12:v1]
7987 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7988 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7992 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7993 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7995 newinsn
= 0xd503201f;
7996 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7999 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
8001 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
8006 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
8008 // Set ldr target register to be x0.
8009 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
8011 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
8013 const AArch64_reloc_property
* reloc_property
=
8014 aarch64_reloc_property_table
->get_reloc_property(
8015 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
8016 return aarch64_reloc_funcs::template rela_general
<32>(
8017 view
, got_entry_address
, addend
, reloc_property
);
8022 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
8026 return aarch64_reloc_funcs::STATUS_OKAY
;
8027 } // End of tls_desc_gd_to_ie
8029 // Relocate section data.
8031 template<int size
, bool big_endian
>
8033 Target_aarch64
<size
, big_endian
>::relocate_section(
8034 const Relocate_info
<size
, big_endian
>* relinfo
,
8035 unsigned int sh_type
,
8036 const unsigned char* prelocs
,
8038 Output_section
* output_section
,
8039 bool needs_special_offset_handling
,
8040 unsigned char* view
,
8041 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
8042 section_size_type view_size
,
8043 const Reloc_symbol_changes
* reloc_symbol_changes
)
8045 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
8046 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
8047 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
8048 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8051 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8053 // See if we are relocating a relaxed input section. If so, the view
8054 // covers the whole output section and we need to adjust accordingly.
8055 if (needs_special_offset_handling
)
8057 const Output_relaxed_input_section
* poris
=
8058 output_section
->find_relaxed_input_section(relinfo
->object
,
8059 relinfo
->data_shndx
);
8062 Address section_address
= poris
->address();
8063 section_size_type section_size
= poris
->data_size();
8065 gold_assert((section_address
>= address
)
8066 && ((section_address
+ section_size
)
8067 <= (address
+ view_size
)));
8069 off_t offset
= section_address
- address
;
8072 view_size
= section_size
;
8076 gold::relocate_section
<size
, big_endian
, Aarch64
, AArch64_relocate
,
8077 gold::Default_comdat_behavior
, Classify_reloc
>(
8083 needs_special_offset_handling
,
8087 reloc_symbol_changes
);
8090 // Scan the relocs during a relocatable link.
8092 template<int size
, bool big_endian
>
8094 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
8095 Symbol_table
* symtab
,
8097 Sized_relobj_file
<size
, big_endian
>* object
,
8098 unsigned int data_shndx
,
8099 unsigned int sh_type
,
8100 const unsigned char* prelocs
,
8102 Output_section
* output_section
,
8103 bool needs_special_offset_handling
,
8104 size_t local_symbol_count
,
8105 const unsigned char* plocal_symbols
,
8106 Relocatable_relocs
* rr
)
8108 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8110 typedef gold::Default_scan_relocatable_relocs
<Classify_reloc
>
8111 Scan_relocatable_relocs
;
8113 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8115 gold::scan_relocatable_relocs
<size
, big_endian
, Scan_relocatable_relocs
>(
8123 needs_special_offset_handling
,
8129 // Scan the relocs for --emit-relocs.
8131 template<int size
, bool big_endian
>
8133 Target_aarch64
<size
, big_endian
>::emit_relocs_scan(
8134 Symbol_table
* symtab
,
8136 Sized_relobj_file
<size
, big_endian
>* object
,
8137 unsigned int data_shndx
,
8138 unsigned int sh_type
,
8139 const unsigned char* prelocs
,
8141 Output_section
* output_section
,
8142 bool needs_special_offset_handling
,
8143 size_t local_symbol_count
,
8144 const unsigned char* plocal_syms
,
8145 Relocatable_relocs
* rr
)
8147 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8149 typedef gold::Default_emit_relocs_strategy
<Classify_reloc
>
8150 Emit_relocs_strategy
;
8152 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8154 gold::scan_relocatable_relocs
<size
, big_endian
, Emit_relocs_strategy
>(
8162 needs_special_offset_handling
,
8168 // Relocate a section during a relocatable link.
8170 template<int size
, bool big_endian
>
8172 Target_aarch64
<size
, big_endian
>::relocate_relocs(
8173 const Relocate_info
<size
, big_endian
>* relinfo
,
8174 unsigned int sh_type
,
8175 const unsigned char* prelocs
,
8177 Output_section
* output_section
,
8178 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
8179 unsigned char* view
,
8180 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
8181 section_size_type view_size
,
8182 unsigned char* reloc_view
,
8183 section_size_type reloc_view_size
)
8185 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8188 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8190 gold::relocate_relocs
<size
, big_endian
, Classify_reloc
>(
8195 offset_in_output_section
,
8204 // Return whether this is a 3-insn erratum sequence.
8206 template<int size
, bool big_endian
>
8208 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
8209 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8210 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
8211 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
8216 // The 2nd insn is a single register load or store; or register pair
8218 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
8219 && (!pair
|| (pair
&& !load
)))
8221 // The 3rd insn is a load or store instruction from the "Load/store
8222 // register (unsigned immediate)" encoding class, using Rn as the
8223 // base address register.
8224 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
8225 && (Insn_utilities::aarch64_rn(insn3
)
8226 == Insn_utilities::aarch64_rd(insn1
)))
8233 // Return whether this is a 835769 sequence.
8234 // (Similarly implemented as in elfnn-aarch64.c.)
8236 template<int size
, bool big_endian
>
8238 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
8239 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8240 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
8250 if (Insn_utilities::aarch64_mlxl(insn2
)
8251 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
8253 /* Any SIMD memory op is independent of the subsequent MLA
8254 by definition of the erratum. */
8255 if (Insn_utilities::aarch64_bit(insn1
, 26))
8258 /* If not SIMD, check for integer memory ops and MLA relationship. */
8259 rn
= Insn_utilities::aarch64_rn(insn2
);
8260 ra
= Insn_utilities::aarch64_ra(insn2
);
8261 rm
= Insn_utilities::aarch64_rm(insn2
);
8263 /* If this is a load and there's a true(RAW) dependency, we are safe
8264 and this is not an erratum sequence. */
8266 (rt
== rn
|| rt
== rm
|| rt
== ra
8267 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
8270 /* We conservatively put out stubs for all other cases (including
8279 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8281 template<int size
, bool big_endian
>
8283 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
8284 AArch64_relobj
<size
, big_endian
>* relobj
,
8286 section_size_type erratum_insn_offset
,
8287 Address erratum_address
,
8288 typename
Insn_utilities::Insntype erratum_insn
,
8290 unsigned int e843419_adrp_offset
)
8292 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
8293 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
8294 gold_assert(stub_table
!= NULL
);
8295 if (stub_table
->find_erratum_stub(relobj
,
8297 erratum_insn_offset
) == NULL
)
8299 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8300 The_erratum_stub
* stub
;
8301 if (erratum_type
== ST_E_835769
)
8302 stub
= new The_erratum_stub(relobj
, erratum_type
, shndx
,
8303 erratum_insn_offset
);
8304 else if (erratum_type
== ST_E_843419
)
8305 stub
= new E843419_stub
<size
, big_endian
>(
8306 relobj
, shndx
, erratum_insn_offset
, e843419_adrp_offset
);
8309 stub
->set_erratum_insn(erratum_insn
);
8310 stub
->set_erratum_address(erratum_address
);
8311 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8312 // always the next insn after erratum insn.
8313 stub
->set_destination_address(erratum_address
+ BPI
);
8314 stub_table
->add_erratum_stub(stub
);
8319 // Scan erratum for section SHNDX range [output_address + span_start,
8320 // output_address + span_end). Note here we do not share the code with
8321 // scan_erratum_843419_span function, because for 843419 we optimize by only
8322 // scanning the last few insns of a page, whereas for 835769, we need to scan
8325 template<int size
, bool big_endian
>
8327 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
8328 AArch64_relobj
<size
, big_endian
>* relobj
,
8330 const section_size_type span_start
,
8331 const section_size_type span_end
,
8332 unsigned char* input_view
,
8333 Address output_address
)
8335 typedef typename
Insn_utilities::Insntype Insntype
;
8337 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8339 // Adjust output_address and view to the start of span.
8340 output_address
+= span_start
;
8341 input_view
+= span_start
;
8343 section_size_type span_length
= span_end
- span_start
;
8344 section_size_type offset
= 0;
8345 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
8347 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8348 Insntype insn1
= ip
[0];
8349 Insntype insn2
= ip
[1];
8350 if (is_erratum_835769_sequence(insn1
, insn2
))
8352 Insntype erratum_insn
= insn2
;
8353 // "span_start + offset" is the offset for insn1. So for insn2, it is
8354 // "span_start + offset + BPI".
8355 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
8356 Address erratum_address
= output_address
+ offset
+ BPI
;
8357 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8358 "section %d, offset 0x%08x."),
8359 relobj
->name().c_str(), shndx
,
8360 (unsigned int)(span_start
+ offset
));
8362 this->create_erratum_stub(relobj
, shndx
,
8363 erratum_insn_offset
, erratum_address
,
8364 erratum_insn
, ST_E_835769
);
8365 offset
+= BPI
; // Skip mac insn.
8368 } // End of "Target_aarch64::scan_erratum_835769_span".
8371 // Scan erratum for section SHNDX range
8372 // [output_address + span_start, output_address + span_end).
8374 template<int size
, bool big_endian
>
8376 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
8377 AArch64_relobj
<size
, big_endian
>* relobj
,
8379 const section_size_type span_start
,
8380 const section_size_type span_end
,
8381 unsigned char* input_view
,
8382 Address output_address
)
8384 typedef typename
Insn_utilities::Insntype Insntype
;
8386 // Adjust output_address and view to the start of span.
8387 output_address
+= span_start
;
8388 input_view
+= span_start
;
8390 if ((output_address
& 0x03) != 0)
8393 section_size_type offset
= 0;
8394 section_size_type span_length
= span_end
- span_start
;
8395 // The first instruction must be ending at 0xFF8 or 0xFFC.
8396 unsigned int page_offset
= output_address
& 0xFFF;
8397 // Make sure starting position, that is "output_address+offset",
8398 // starts at page position 0xff8 or 0xffc.
8399 if (page_offset
< 0xff8)
8400 offset
= 0xff8 - page_offset
;
8401 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8403 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8404 Insntype insn1
= ip
[0];
8405 if (Insn_utilities::is_adrp(insn1
))
8407 Insntype insn2
= ip
[1];
8408 Insntype insn3
= ip
[2];
8409 Insntype erratum_insn
;
8410 unsigned insn_offset
;
8411 bool do_report
= false;
8412 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
8415 erratum_insn
= insn3
;
8416 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
8418 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8420 // Optionally we can have an insn between ins2 and ins3
8421 Insntype insn_opt
= ip
[2];
8422 // And insn_opt must not be a branch.
8423 if (!Insn_utilities::aarch64_b(insn_opt
)
8424 && !Insn_utilities::aarch64_bl(insn_opt
)
8425 && !Insn_utilities::aarch64_blr(insn_opt
)
8426 && !Insn_utilities::aarch64_br(insn_opt
))
8428 // And insn_opt must not write to dest reg in insn1. However
8429 // we do a conservative scan, which means we may fix/report
8430 // more than necessary, but it doesn't hurt.
8432 Insntype insn4
= ip
[3];
8433 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8436 erratum_insn
= insn4
;
8437 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8443 unsigned int erratum_insn_offset
=
8444 span_start
+ offset
+ insn_offset
;
8445 Address erratum_address
=
8446 output_address
+ offset
+ insn_offset
;
8447 create_erratum_stub(relobj
, shndx
,
8448 erratum_insn_offset
, erratum_address
,
8449 erratum_insn
, ST_E_843419
,
8450 span_start
+ offset
);
8454 // Advance to next candidate instruction. We only consider instruction
8455 // sequences starting at a page offset of 0xff8 or 0xffc.
8456 page_offset
= (output_address
+ offset
) & 0xfff;
8457 if (page_offset
== 0xff8)
8459 else // (page_offset == 0xffc), we move to next page's 0xff8.
8462 } // End of "Target_aarch64::scan_erratum_843419_span".
8465 // The selector for aarch64 object files.
8467 template<int size
, bool big_endian
>
8468 class Target_selector_aarch64
: public Target_selector
8471 Target_selector_aarch64();
8474 do_instantiate_target()
8475 { return new Target_aarch64
<size
, big_endian
>(); }
8479 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8480 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8481 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8485 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8486 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8487 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8491 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8492 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8493 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8497 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8498 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8499 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8502 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8503 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8504 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8505 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8507 } // End anonymous namespace.