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(
1867 The_erratum_stub
*, AArch64_address
,
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 const Relobj::Output_sections
& out_sections(this->output_sections());
1984 for (unsigned int i
= 1; i
< shnum
; ++i
)
1986 The_stub_table
* stub_table
= this->stub_table(i
);
1989 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1990 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
1991 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
1992 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1993 pview((*pviews
)[i
]);
1994 AArch64_address view_offset
= 0;
1995 if (pview
.is_input_output_view
)
1997 // In this case, write_sections has not added the output offset to
1998 // the view's address, so we must do so. Currently this only happens
1999 // for a relaxed section.
2000 unsigned int index
= this->adjust_shndx(i
);
2001 const Output_relaxed_input_section
* poris
=
2002 out_sections
[index
]->find_relaxed_input_section(this, index
);
2003 gold_assert(poris
!= NULL
);
2004 view_offset
= poris
->address() - pview
.address
;
2009 The_erratum_stub
* stub
= *p
;
2011 // Double check data before fix.
2012 gold_assert(pview
.address
+ view_offset
+ stub
->sh_offset()
2013 == stub
->erratum_address());
2015 // Update previously recorded erratum insn with relocated
2018 reinterpret_cast<Insntype
*>(
2019 pview
.view
+ view_offset
+ stub
->sh_offset());
2020 Insntype insn_to_fix
= ip
[0];
2021 stub
->update_erratum_insn(insn_to_fix
);
2023 // First try to see if erratum is 843419 and if it can be fixed
2024 // without using branch-to-stub.
2025 if (!try_fix_erratum_843419_optimized(stub
, view_offset
, pview
))
2027 // Replace the erratum insn with a branch-to-stub.
2028 AArch64_address stub_address
=
2029 stub_table
->erratum_stub_address(stub
);
2030 unsigned int b_offset
= stub_address
- stub
->erratum_address();
2031 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
2032 pview
.view
+ view_offset
+ stub
->sh_offset(),
2033 b_offset
& 0xfffffff);
2036 // Erratum fix is done (or skipped), continue to relocate erratum
2037 // stub. Note, when erratum fix is skipped (either because we
2038 // proactively change the code sequence or the code sequence is
2039 // changed by relaxation, etc), we can still safely relocate the
2040 // erratum stub, ignoring the fact the erratum could never be
2042 stub_table
->relocate_erratum_stub(
2044 pview
.view
+ (stub_table
->address() - pview
.address
));
2046 // Next erratum stub.
2053 // This is an optimization for 843419. This erratum requires the sequence begin
2054 // with 'adrp', when final value calculated by adrp fits in adr, we can just
2055 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
2056 // in this case, we do not delete the erratum stub (too late to do so), it is
2057 // merely generated without ever being called.)
2059 template<int size
, bool big_endian
>
2061 AArch64_relobj
<size
, big_endian
>::try_fix_erratum_843419_optimized(
2062 The_erratum_stub
* stub
, AArch64_address view_offset
,
2063 typename Sized_relobj_file
<size
, big_endian
>::View_size
& pview
)
2065 if (stub
->type() != ST_E_843419
)
2068 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2069 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
2070 E843419_stub
<size
, big_endian
>* e843419_stub
=
2071 reinterpret_cast<E843419_stub
<size
, big_endian
>*>(stub
);
2072 AArch64_address pc
=
2073 pview
.address
+ view_offset
+ e843419_stub
->adrp_sh_offset();
2074 unsigned int adrp_offset
= e843419_stub
->adrp_sh_offset ();
2075 Insntype
* adrp_view
=
2076 reinterpret_cast<Insntype
*>(pview
.view
+ view_offset
+ adrp_offset
);
2077 Insntype adrp_insn
= adrp_view
[0];
2079 // If the instruction at adrp_sh_offset is "mrs R, tpidr_el0", it may come
2080 // from IE -> LE relaxation etc. This is a side-effect of TLS relaxation that
2081 // ADRP has been turned into MRS, there is no erratum risk anymore.
2082 // Therefore, we return true to avoid doing unnecessary branch-to-stub.
2083 if (Insn_utilities::is_mrs_tpidr_el0(adrp_insn
))
2086 // If the instruction at adrp_sh_offset is not ADRP and the instruction before
2087 // it is "mrs R, tpidr_el0", it may come from LD -> LE relaxation etc.
2088 // Like the above case, there is no erratum risk any more, we can safely
2090 if (!Insn_utilities::is_adrp(adrp_insn
) && adrp_offset
)
2092 Insntype
* prev_view
=
2093 reinterpret_cast<Insntype
*>(
2094 pview
.view
+ view_offset
+ adrp_offset
- 4);
2095 Insntype prev_insn
= prev_view
[0];
2097 if (Insn_utilities::is_mrs_tpidr_el0(prev_insn
))
2101 /* If we reach here, the first instruction must be ADRP. */
2102 gold_assert(Insn_utilities::is_adrp(adrp_insn
));
2103 // Get adrp 33-bit signed imm value.
2104 int64_t adrp_imm
= Insn_utilities::
2105 aarch64_adrp_decode_imm(adrp_insn
);
2106 // adrp - final value transferred to target register is calculated as:
2107 // PC[11:0] = Zeros(12)
2108 // adrp_dest_value = PC + adrp_imm;
2109 int64_t adrp_dest_value
= (pc
& ~((1 << 12) - 1)) + adrp_imm
;
2110 // adr -final value transferred to target register is calucalted as:
2113 // PC + adr_imm = adrp_dest_value
2115 // adr_imm = adrp_dest_value - PC
2116 int64_t adr_imm
= adrp_dest_value
- pc
;
2117 // Check if imm fits in adr (21-bit signed).
2118 if (-(1 << 20) <= adr_imm
&& adr_imm
< (1 << 20))
2120 // Convert 'adrp' into 'adr'.
2121 Insntype adr_insn
= adrp_insn
& ((1u << 31) - 1);
2122 adr_insn
= Insn_utilities::
2123 aarch64_adr_encode_imm(adr_insn
, adr_imm
);
2124 elfcpp::Swap
<32, big_endian
>::writeval(adrp_view
, adr_insn
);
2131 // Relocate sections.
2133 template<int size
, bool big_endian
>
2135 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
2136 const Symbol_table
* symtab
, const Layout
* layout
,
2137 const unsigned char* pshdrs
, Output_file
* of
,
2138 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
2140 // Relocate the section data.
2141 this->relocate_section_range(symtab
, layout
, pshdrs
, of
, pviews
,
2142 1, this->shnum() - 1);
2144 // We do not generate stubs if doing a relocatable link.
2145 if (parameters
->options().relocatable())
2148 // This part only relocates erratum stubs that belong to input sections of this
2150 if (parameters
->options().fix_cortex_a53_843419()
2151 || parameters
->options().fix_cortex_a53_835769())
2152 this->fix_errata_and_relocate_erratum_stubs(pviews
);
2154 Relocate_info
<size
, big_endian
> relinfo
;
2155 relinfo
.symtab
= symtab
;
2156 relinfo
.layout
= layout
;
2157 relinfo
.object
= this;
2159 // This part relocates all reloc stubs that are contained in stub_tables of
2160 // this object file.
2161 unsigned int shnum
= this->shnum();
2162 The_target_aarch64
* target
= The_target_aarch64::current_target();
2164 for (unsigned int i
= 1; i
< shnum
; ++i
)
2166 The_aarch64_input_section
* aarch64_input_section
=
2167 target
->find_aarch64_input_section(this, i
);
2168 if (aarch64_input_section
!= NULL
2169 && aarch64_input_section
->is_stub_table_owner()
2170 && !aarch64_input_section
->stub_table()->empty())
2172 Output_section
* os
= this->output_section(i
);
2173 gold_assert(os
!= NULL
);
2175 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
2176 relinfo
.reloc_shdr
= NULL
;
2177 relinfo
.data_shndx
= i
;
2178 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
2180 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2181 view_struct
= (*pviews
)[i
];
2182 gold_assert(view_struct
.view
!= NULL
);
2184 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
2185 off_t offset
= stub_table
->address() - view_struct
.address
;
2186 unsigned char* view
= view_struct
.view
+ offset
;
2187 AArch64_address address
= stub_table
->address();
2188 section_size_type view_size
= stub_table
->data_size();
2189 stub_table
->relocate_reloc_stubs(&relinfo
, target
, os
, view
, address
,
2196 // Determine if an input section is scannable for stub processing. SHDR is
2197 // the header of the section and SHNDX is the section index. OS is the output
2198 // section for the input section and SYMTAB is the global symbol table used to
2199 // look up ICF information.
2201 template<int size
, bool big_endian
>
2203 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
2204 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
2205 unsigned int text_shndx
,
2206 const Output_section
* os
,
2207 const Symbol_table
* symtab
)
2209 // Skip any empty sections, unallocated sections or sections whose
2210 // type are not SHT_PROGBITS.
2211 if (text_shdr
.get_sh_size() == 0
2212 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
2213 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2216 // Skip any discarded or ICF'ed sections.
2217 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
2220 // Skip exception frame.
2221 if (strcmp(os
->name(), ".eh_frame") == 0)
2224 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
2225 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2231 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2232 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2234 template<int size
, bool big_endian
>
2236 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2237 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2238 const Relobj::Output_sections
& out_sections
,
2239 const Symbol_table
* symtab
,
2240 const unsigned char* pshdrs
)
2242 unsigned int sh_type
= shdr
.get_sh_type();
2243 if (sh_type
!= elfcpp::SHT_RELA
)
2246 // Ignore empty section.
2247 off_t sh_size
= shdr
.get_sh_size();
2251 // Ignore reloc section with unexpected symbol table. The
2252 // error will be reported in the final link.
2253 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2256 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2257 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2259 // Ignore reloc section with unexpected entsize or uneven size.
2260 // The error will be reported in the final link.
2261 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2264 // Ignore reloc section with bad info. This error will be
2265 // reported in the final link.
2266 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2267 if (text_shndx
>= this->shnum())
2270 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2271 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2272 text_shndx
* shdr_size
);
2273 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2274 out_sections
[text_shndx
], symtab
);
2278 // Scan section SHNDX for erratum 843419 and 835769.
2280 template<int size
, bool big_endian
>
2282 AArch64_relobj
<size
, big_endian
>::scan_errata(
2283 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2284 Output_section
* os
, const Symbol_table
* symtab
,
2285 The_target_aarch64
* target
)
2287 if (shdr
.get_sh_size() == 0
2288 || (shdr
.get_sh_flags() &
2289 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2290 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2293 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2295 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2296 AArch64_address output_address
;
2297 if (output_offset
!= invalid_address
)
2298 output_address
= os
->address() + output_offset
;
2301 const Output_relaxed_input_section
* poris
=
2302 os
->find_relaxed_input_section(this, shndx
);
2304 output_address
= poris
->address();
2307 section_size_type input_view_size
= 0;
2308 const unsigned char* input_view
=
2309 this->section_contents(shndx
, &input_view_size
, false);
2311 Mapping_symbol_position
section_start(shndx
, 0);
2312 // Find the first mapping symbol record within section shndx.
2313 typename
Mapping_symbol_info::const_iterator p
=
2314 this->mapping_symbol_info_
.lower_bound(section_start
);
2315 while (p
!= this->mapping_symbol_info_
.end() &&
2316 p
->first
.shndx_
== shndx
)
2318 typename
Mapping_symbol_info::const_iterator prev
= p
;
2320 if (prev
->second
== 'x')
2322 section_size_type span_start
=
2323 convert_to_section_size_type(prev
->first
.offset_
);
2324 section_size_type span_end
;
2325 if (p
!= this->mapping_symbol_info_
.end()
2326 && p
->first
.shndx_
== shndx
)
2327 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2329 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2331 // Here we do not share the scanning code of both errata. For 843419,
2332 // only the last few insns of each page are examined, which is fast,
2333 // whereas, for 835769, every insn pair needs to be checked.
2335 if (parameters
->options().fix_cortex_a53_843419())
2336 target
->scan_erratum_843419_span(
2337 this, shndx
, span_start
, span_end
,
2338 const_cast<unsigned char*>(input_view
), output_address
);
2340 if (parameters
->options().fix_cortex_a53_835769())
2341 target
->scan_erratum_835769_span(
2342 this, shndx
, span_start
, span_end
,
2343 const_cast<unsigned char*>(input_view
), output_address
);
2349 // Scan relocations for stub generation.
2351 template<int size
, bool big_endian
>
2353 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2354 The_target_aarch64
* target
,
2355 const Symbol_table
* symtab
,
2356 const Layout
* layout
)
2358 unsigned int shnum
= this->shnum();
2359 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2361 // Read the section headers.
2362 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2366 // To speed up processing, we set up hash tables for fast lookup of
2367 // input offsets to output addresses.
2368 this->initialize_input_to_output_maps();
2370 const Relobj::Output_sections
& out_sections(this->output_sections());
2372 Relocate_info
<size
, big_endian
> relinfo
;
2373 relinfo
.symtab
= symtab
;
2374 relinfo
.layout
= layout
;
2375 relinfo
.object
= this;
2377 // Do relocation stubs scanning.
2378 const unsigned char* p
= pshdrs
+ shdr_size
;
2379 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2381 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2382 if (parameters
->options().fix_cortex_a53_843419()
2383 || parameters
->options().fix_cortex_a53_835769())
2384 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2385 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2388 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2389 AArch64_address output_offset
=
2390 this->get_output_section_offset(index
);
2391 AArch64_address output_address
;
2392 if (output_offset
!= invalid_address
)
2394 output_address
= out_sections
[index
]->address() + output_offset
;
2398 // Currently this only happens for a relaxed section.
2399 const Output_relaxed_input_section
* poris
=
2400 out_sections
[index
]->find_relaxed_input_section(this, index
);
2401 gold_assert(poris
!= NULL
);
2402 output_address
= poris
->address();
2405 // Get the relocations.
2406 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2410 // Get the section contents.
2411 section_size_type input_view_size
= 0;
2412 const unsigned char* input_view
=
2413 this->section_contents(index
, &input_view_size
, false);
2415 relinfo
.reloc_shndx
= i
;
2416 relinfo
.data_shndx
= index
;
2417 unsigned int sh_type
= shdr
.get_sh_type();
2418 unsigned int reloc_size
;
2419 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2420 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2422 Output_section
* os
= out_sections
[index
];
2423 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2424 shdr
.get_sh_size() / reloc_size
,
2426 output_offset
== invalid_address
,
2427 input_view
, output_address
,
2434 // A class to wrap an ordinary input section containing executable code.
2436 template<int size
, bool big_endian
>
2437 class AArch64_input_section
: public Output_relaxed_input_section
2440 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2442 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2443 : Output_relaxed_input_section(relobj
, shndx
, 1),
2445 original_contents_(NULL
), original_size_(0),
2446 original_addralign_(1)
2449 ~AArch64_input_section()
2450 { delete[] this->original_contents_
; }
2456 // Set the stub_table.
2458 set_stub_table(The_stub_table
* st
)
2459 { this->stub_table_
= st
; }
2461 // Whether this is a stub table owner.
2463 is_stub_table_owner() const
2464 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2466 // Return the original size of the section.
2468 original_size() const
2469 { return this->original_size_
; }
2471 // Return the stub table.
2474 { return stub_table_
; }
2477 // Write out this input section.
2479 do_write(Output_file
*);
2481 // Return required alignment of this.
2483 do_addralign() const
2485 if (this->is_stub_table_owner())
2486 return std::max(this->stub_table_
->addralign(),
2487 static_cast<uint64_t>(this->original_addralign_
));
2489 return this->original_addralign_
;
2492 // Finalize data size.
2494 set_final_data_size();
2496 // Reset address and file offset.
2498 do_reset_address_and_file_offset();
2502 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2503 section_offset_type offset
,
2504 section_offset_type
* poutput
) const
2506 if ((object
== this->relobj())
2507 && (shndx
== this->shndx())
2510 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2520 // Copying is not allowed.
2521 AArch64_input_section(const AArch64_input_section
&);
2522 AArch64_input_section
& operator=(const AArch64_input_section
&);
2524 // The relocation stubs.
2525 The_stub_table
* stub_table_
;
2526 // Original section contents. We have to make a copy here since the file
2527 // containing the original section may not be locked when we need to access
2529 unsigned char* original_contents_
;
2530 // Section size of the original input section.
2531 uint32_t original_size_
;
2532 // Address alignment of the original input section.
2533 uint32_t original_addralign_
;
2534 }; // End of AArch64_input_section
2537 // Finalize data size.
2539 template<int size
, bool big_endian
>
2541 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2543 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2545 if (this->is_stub_table_owner())
2547 this->stub_table_
->finalize_data_size();
2548 off
= align_address(off
, this->stub_table_
->addralign());
2549 off
+= this->stub_table_
->data_size();
2551 this->set_data_size(off
);
2555 // Reset address and file offset.
2557 template<int size
, bool big_endian
>
2559 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2561 // Size of the original input section contents.
2562 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2564 // If this is a stub table owner, account for the stub table size.
2565 if (this->is_stub_table_owner())
2567 The_stub_table
* stub_table
= this->stub_table_
;
2569 // Reset the stub table's address and file offset. The
2570 // current data size for child will be updated after that.
2571 stub_table_
->reset_address_and_file_offset();
2572 off
= align_address(off
, stub_table_
->addralign());
2573 off
+= stub_table
->current_data_size();
2576 this->set_current_data_size(off
);
2580 // Initialize an Arm_input_section.
2582 template<int size
, bool big_endian
>
2584 AArch64_input_section
<size
, big_endian
>::init()
2586 Relobj
* relobj
= this->relobj();
2587 unsigned int shndx
= this->shndx();
2589 // We have to cache original size, alignment and contents to avoid locking
2590 // the original file.
2591 this->original_addralign_
=
2592 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2594 // This is not efficient but we expect only a small number of relaxed
2595 // input sections for stubs.
2596 section_size_type section_size
;
2597 const unsigned char* section_contents
=
2598 relobj
->section_contents(shndx
, §ion_size
, false);
2599 this->original_size_
=
2600 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2602 gold_assert(this->original_contents_
== NULL
);
2603 this->original_contents_
= new unsigned char[section_size
];
2604 memcpy(this->original_contents_
, section_contents
, section_size
);
2606 // We want to make this look like the original input section after
2607 // output sections are finalized.
2608 Output_section
* os
= relobj
->output_section(shndx
);
2609 off_t offset
= relobj
->output_section_offset(shndx
);
2610 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2611 this->set_address(os
->address() + offset
);
2612 this->set_file_offset(os
->offset() + offset
);
2613 this->set_current_data_size(this->original_size_
);
2614 this->finalize_data_size();
2618 // Write data to output file.
2620 template<int size
, bool big_endian
>
2622 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2624 // We have to write out the original section content.
2625 gold_assert(this->original_contents_
!= NULL
);
2626 of
->write(this->offset(), this->original_contents_
,
2627 this->original_size_
);
2629 // If this owns a stub table and it is not empty, write it.
2630 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2631 this->stub_table_
->write(of
);
2635 // Arm output section class. This is defined mainly to add a number of stub
2636 // generation methods.
2638 template<int size
, bool big_endian
>
2639 class AArch64_output_section
: public Output_section
2642 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2643 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2644 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2645 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2648 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2649 elfcpp::Elf_Xword flags
)
2650 : Output_section(name
, type
, flags
)
2653 ~AArch64_output_section() {}
2655 // Group input sections for stub generation.
2657 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2661 typedef Output_section::Input_section Input_section
;
2662 typedef Output_section::Input_section_list Input_section_list
;
2664 // Create a stub group.
2666 create_stub_group(Input_section_list::const_iterator
,
2667 Input_section_list::const_iterator
,
2668 Input_section_list::const_iterator
,
2669 The_target_aarch64
*,
2670 std::vector
<Output_relaxed_input_section
*>&,
2672 }; // End of AArch64_output_section
2675 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2676 // the input section that will be the owner of the stub table.
2678 template<int size
, bool big_endian
> void
2679 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2680 Input_section_list::const_iterator first
,
2681 Input_section_list::const_iterator last
,
2682 Input_section_list::const_iterator owner
,
2683 The_target_aarch64
* target
,
2684 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2687 // Currently we convert ordinary input sections into relaxed sections only
2689 The_aarch64_input_section
* input_section
;
2690 if (owner
->is_relaxed_input_section())
2694 gold_assert(owner
->is_input_section());
2695 // Create a new relaxed input section. We need to lock the original
2697 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2699 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2700 new_relaxed_sections
.push_back(input_section
);
2703 // Create a stub table.
2704 The_stub_table
* stub_table
=
2705 target
->new_stub_table(input_section
);
2707 input_section
->set_stub_table(stub_table
);
2709 Input_section_list::const_iterator p
= first
;
2710 // Look for input sections or relaxed input sections in [first ... last].
2713 if (p
->is_input_section() || p
->is_relaxed_input_section())
2715 // The stub table information for input sections live
2716 // in their objects.
2717 The_aarch64_relobj
* aarch64_relobj
=
2718 static_cast<The_aarch64_relobj
*>(p
->relobj());
2719 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2722 while (p
++ != last
);
2726 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2727 // stub groups. We grow a stub group by adding input section until the size is
2728 // just below GROUP_SIZE. The last input section will be converted into a stub
2729 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2730 // after the stub table, effectively doubling the group size.
2732 // This is similar to the group_sections() function in elf32-arm.c but is
2733 // implemented differently.
2735 template<int size
, bool big_endian
>
2736 void AArch64_output_section
<size
, big_endian
>::group_sections(
2737 section_size_type group_size
,
2738 bool stubs_always_after_branch
,
2739 Target_aarch64
<size
, big_endian
>* target
,
2745 FINDING_STUB_SECTION
,
2749 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2751 State state
= NO_GROUP
;
2752 section_size_type off
= 0;
2753 section_size_type group_begin_offset
= 0;
2754 section_size_type group_end_offset
= 0;
2755 section_size_type stub_table_end_offset
= 0;
2756 Input_section_list::const_iterator group_begin
=
2757 this->input_sections().end();
2758 Input_section_list::const_iterator stub_table
=
2759 this->input_sections().end();
2760 Input_section_list::const_iterator group_end
= this->input_sections().end();
2761 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2762 p
!= this->input_sections().end();
2765 section_size_type section_begin_offset
=
2766 align_address(off
, p
->addralign());
2767 section_size_type section_end_offset
=
2768 section_begin_offset
+ p
->data_size();
2770 // Check to see if we should group the previously seen sections.
2776 case FINDING_STUB_SECTION
:
2777 // Adding this section makes the group larger than GROUP_SIZE.
2778 if (section_end_offset
- group_begin_offset
>= group_size
)
2780 if (stubs_always_after_branch
)
2782 gold_assert(group_end
!= this->input_sections().end());
2783 this->create_stub_group(group_begin
, group_end
, group_end
,
2784 target
, new_relaxed_sections
,
2790 // Input sections up to stub_group_size bytes after the stub
2791 // table can be handled by it too.
2792 state
= HAS_STUB_SECTION
;
2793 stub_table
= group_end
;
2794 stub_table_end_offset
= group_end_offset
;
2799 case HAS_STUB_SECTION
:
2800 // Adding this section makes the post stub-section group larger
2803 // NOT SUPPORTED YET. For completeness only.
2804 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2806 gold_assert(group_end
!= this->input_sections().end());
2807 this->create_stub_group(group_begin
, group_end
, stub_table
,
2808 target
, new_relaxed_sections
, task
);
2817 // If we see an input section and currently there is no group, start
2818 // a new one. Skip any empty sections. We look at the data size
2819 // instead of calling p->relobj()->section_size() to avoid locking.
2820 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2821 && (p
->data_size() != 0))
2823 if (state
== NO_GROUP
)
2825 state
= FINDING_STUB_SECTION
;
2827 group_begin_offset
= section_begin_offset
;
2830 // Keep track of the last input section seen.
2832 group_end_offset
= section_end_offset
;
2835 off
= section_end_offset
;
2838 // Create a stub group for any ungrouped sections.
2839 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2841 gold_assert(group_end
!= this->input_sections().end());
2842 this->create_stub_group(group_begin
, group_end
,
2843 (state
== FINDING_STUB_SECTION
2846 target
, new_relaxed_sections
, task
);
2849 if (!new_relaxed_sections
.empty())
2850 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2852 // Update the section offsets
2853 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2855 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2856 new_relaxed_sections
[i
]->relobj());
2857 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2858 // Tell AArch64_relobj that this input section is converted.
2859 relobj
->convert_input_section_to_relaxed_section(shndx
);
2861 } // End of AArch64_output_section::group_sections
2864 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2867 // The aarch64 target class.
2869 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2870 template<int size
, bool big_endian
>
2871 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2874 typedef Target_aarch64
<size
, big_endian
> This
;
2875 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2877 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2878 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2879 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2880 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2881 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2882 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2883 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2884 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2885 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2886 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2887 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2888 typedef Unordered_map
<Section_id
,
2889 AArch64_input_section
<size
, big_endian
>*,
2890 Section_id_hash
> AArch64_input_section_map
;
2891 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2892 const static int TCB_SIZE
= size
/ 8 * 2;
2894 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2895 : Sized_target
<size
, big_endian
>(info
),
2896 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2897 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2898 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2899 got_mod_index_offset_(-1U),
2900 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2901 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2904 // Scan the relocations to determine unreferenced sections for
2905 // garbage collection.
2907 gc_process_relocs(Symbol_table
* symtab
,
2909 Sized_relobj_file
<size
, big_endian
>* object
,
2910 unsigned int data_shndx
,
2911 unsigned int sh_type
,
2912 const unsigned char* prelocs
,
2914 Output_section
* output_section
,
2915 bool needs_special_offset_handling
,
2916 size_t local_symbol_count
,
2917 const unsigned char* plocal_symbols
);
2919 // Scan the relocations to look for symbol adjustments.
2921 scan_relocs(Symbol_table
* symtab
,
2923 Sized_relobj_file
<size
, big_endian
>* object
,
2924 unsigned int data_shndx
,
2925 unsigned int sh_type
,
2926 const unsigned char* prelocs
,
2928 Output_section
* output_section
,
2929 bool needs_special_offset_handling
,
2930 size_t local_symbol_count
,
2931 const unsigned char* plocal_symbols
);
2933 // Finalize the sections.
2935 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2937 // Return the value to use for a dynamic which requires special
2940 do_dynsym_value(const Symbol
*) const;
2942 // Relocate a section.
2944 relocate_section(const Relocate_info
<size
, big_endian
>*,
2945 unsigned int sh_type
,
2946 const unsigned char* prelocs
,
2948 Output_section
* output_section
,
2949 bool needs_special_offset_handling
,
2950 unsigned char* view
,
2951 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2952 section_size_type view_size
,
2953 const Reloc_symbol_changes
*);
2955 // Scan the relocs during a relocatable link.
2957 scan_relocatable_relocs(Symbol_table
* symtab
,
2959 Sized_relobj_file
<size
, big_endian
>* object
,
2960 unsigned int data_shndx
,
2961 unsigned int sh_type
,
2962 const unsigned char* prelocs
,
2964 Output_section
* output_section
,
2965 bool needs_special_offset_handling
,
2966 size_t local_symbol_count
,
2967 const unsigned char* plocal_symbols
,
2968 Relocatable_relocs
*);
2970 // Scan the relocs for --emit-relocs.
2972 emit_relocs_scan(Symbol_table
* symtab
,
2974 Sized_relobj_file
<size
, big_endian
>* object
,
2975 unsigned int data_shndx
,
2976 unsigned int sh_type
,
2977 const unsigned char* prelocs
,
2979 Output_section
* output_section
,
2980 bool needs_special_offset_handling
,
2981 size_t local_symbol_count
,
2982 const unsigned char* plocal_syms
,
2983 Relocatable_relocs
* rr
);
2985 // Relocate a section during a relocatable link.
2988 const Relocate_info
<size
, big_endian
>*,
2989 unsigned int sh_type
,
2990 const unsigned char* prelocs
,
2992 Output_section
* output_section
,
2993 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
2994 unsigned char* view
,
2995 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2996 section_size_type view_size
,
2997 unsigned char* reloc_view
,
2998 section_size_type reloc_view_size
);
3000 // Return the symbol index to use for a target specific relocation.
3001 // The only target specific relocation is R_AARCH64_TLSDESC for a
3002 // local symbol, which is an absolute reloc.
3004 do_reloc_symbol_index(void*, unsigned int r_type
) const
3006 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
3010 // Return the addend to use for a target specific relocation.
3012 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
3014 // Return the PLT section.
3016 do_plt_address_for_global(const Symbol
* gsym
) const
3017 { return this->plt_section()->address_for_global(gsym
); }
3020 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
3021 { return this->plt_section()->address_for_local(relobj
, symndx
); }
3023 // This function should be defined in targets that can use relocation
3024 // types to determine (implemented in local_reloc_may_be_function_pointer
3025 // and global_reloc_may_be_function_pointer)
3026 // if a function's pointer is taken. ICF uses this in safe mode to only
3027 // fold those functions whose pointer is defintely not taken.
3029 do_can_check_for_function_pointers() const
3032 // Return the number of entries in the PLT.
3034 plt_entry_count() const;
3036 //Return the offset of the first non-reserved PLT entry.
3038 first_plt_entry_offset() const;
3040 // Return the size of each PLT entry.
3042 plt_entry_size() const;
3044 // Create a stub table.
3046 new_stub_table(The_aarch64_input_section
*);
3048 // Create an aarch64 input section.
3049 The_aarch64_input_section
*
3050 new_aarch64_input_section(Relobj
*, unsigned int);
3052 // Find an aarch64 input section instance for a given OBJ and SHNDX.
3053 The_aarch64_input_section
*
3054 find_aarch64_input_section(Relobj
*, unsigned int) const;
3056 // Return the thread control block size.
3058 tcb_size() const { return This::TCB_SIZE
; }
3060 // Scan a section for stub generation.
3062 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
3063 const unsigned char*, size_t, Output_section
*,
3064 bool, const unsigned char*,
3068 // Scan a relocation section for stub.
3069 template<int sh_type
>
3071 scan_reloc_section_for_stubs(
3072 const The_relocate_info
* relinfo
,
3073 const unsigned char* prelocs
,
3075 Output_section
* output_section
,
3076 bool needs_special_offset_handling
,
3077 const unsigned char* view
,
3078 Address view_address
,
3081 // Relocate a single reloc stub.
3083 relocate_reloc_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
3084 Output_section
*, unsigned char*, Address
,
3087 // Get the default AArch64 target.
3091 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
3092 && parameters
->target().get_size() == size
3093 && parameters
->target().is_big_endian() == big_endian
);
3094 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
3098 // Scan erratum 843419 for a part of a section.
3100 scan_erratum_843419_span(
3101 AArch64_relobj
<size
, big_endian
>*,
3103 const section_size_type
,
3104 const section_size_type
,
3108 // Scan erratum 835769 for a part of a section.
3110 scan_erratum_835769_span(
3111 AArch64_relobj
<size
, big_endian
>*,
3113 const section_size_type
,
3114 const section_size_type
,
3120 do_select_as_default_target()
3122 gold_assert(aarch64_reloc_property_table
== NULL
);
3123 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
3126 // Add a new reloc argument, returning the index in the vector.
3128 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
3131 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
3132 return this->tlsdesc_reloc_info_
.size() - 1;
3135 virtual Output_data_plt_aarch64
<size
, big_endian
>*
3136 do_make_data_plt(Layout
* layout
,
3137 Output_data_got_aarch64
<size
, big_endian
>* got
,
3138 Output_data_space
* got_plt
,
3139 Output_data_space
* got_irelative
)
3141 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
3142 layout
, got
, got_plt
, got_irelative
);
3146 // do_make_elf_object to override the same function in the base class.
3148 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
3149 const elfcpp::Ehdr
<size
, big_endian
>&);
3151 Output_data_plt_aarch64
<size
, big_endian
>*
3152 make_data_plt(Layout
* layout
,
3153 Output_data_got_aarch64
<size
, big_endian
>* got
,
3154 Output_data_space
* got_plt
,
3155 Output_data_space
* got_irelative
)
3157 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
3160 // We only need to generate stubs, and hence perform relaxation if we are
3161 // not doing relocatable linking.
3163 do_may_relax() const
3164 { return !parameters
->options().relocatable(); }
3166 // Relaxation hook. This is where we do stub generation.
3168 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
3171 group_sections(Layout
* layout
,
3172 section_size_type group_size
,
3173 bool stubs_always_after_branch
,
3177 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
3178 const Sized_symbol
<size
>*, unsigned int,
3179 const Symbol_value
<size
>*,
3180 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
3183 // Make an output section.
3185 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
3186 elfcpp::Elf_Xword flags
)
3187 { return new The_aarch64_output_section(name
, type
, flags
); }
3190 // The class which scans relocations.
3195 : issued_non_pic_error_(false)
3199 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3200 Sized_relobj_file
<size
, big_endian
>* object
,
3201 unsigned int data_shndx
,
3202 Output_section
* output_section
,
3203 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3204 const elfcpp::Sym
<size
, big_endian
>& lsym
,
3208 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3209 Sized_relobj_file
<size
, big_endian
>* object
,
3210 unsigned int data_shndx
,
3211 Output_section
* output_section
,
3212 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3216 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3217 Target_aarch64
<size
, big_endian
>* ,
3218 Sized_relobj_file
<size
, big_endian
>* ,
3221 const elfcpp::Rela
<size
, big_endian
>& ,
3222 unsigned int r_type
,
3223 const elfcpp::Sym
<size
, big_endian
>&);
3226 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3227 Target_aarch64
<size
, big_endian
>* ,
3228 Sized_relobj_file
<size
, big_endian
>* ,
3231 const elfcpp::Rela
<size
, big_endian
>& ,
3232 unsigned int r_type
,
3237 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3238 unsigned int r_type
);
3241 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3242 unsigned int r_type
, Symbol
*);
3245 possible_function_pointer_reloc(unsigned int r_type
);
3248 check_non_pic(Relobj
*, unsigned int r_type
);
3251 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3252 unsigned int r_type
);
3254 // Whether we have issued an error about a non-PIC compilation.
3255 bool issued_non_pic_error_
;
3258 // The class which implements relocation.
3263 : skip_call_tls_get_addr_(false)
3269 // Do a relocation. Return false if the caller should not issue
3270 // any warnings about this relocation.
3272 relocate(const Relocate_info
<size
, big_endian
>*, unsigned int,
3273 Target_aarch64
*, Output_section
*, size_t, const unsigned char*,
3274 const Sized_symbol
<size
>*, const Symbol_value
<size
>*,
3275 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3279 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3280 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3281 Target_aarch64
<size
, big_endian
>*,
3283 const elfcpp::Rela
<size
, big_endian
>&,
3284 unsigned int r_type
, const Sized_symbol
<size
>*,
3285 const Symbol_value
<size
>*,
3287 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3289 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3291 const Relocate_info
<size
, big_endian
>*,
3292 Target_aarch64
<size
, big_endian
>*,
3293 const elfcpp::Rela
<size
, big_endian
>&,
3296 const Symbol_value
<size
>*);
3298 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3300 const Relocate_info
<size
, big_endian
>*,
3301 Target_aarch64
<size
, big_endian
>*,
3302 const elfcpp::Rela
<size
, big_endian
>&,
3305 const Symbol_value
<size
>*);
3307 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3309 const Relocate_info
<size
, big_endian
>*,
3310 Target_aarch64
<size
, big_endian
>*,
3311 const elfcpp::Rela
<size
, big_endian
>&,
3314 const Symbol_value
<size
>*);
3316 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3318 const Relocate_info
<size
, big_endian
>*,
3319 Target_aarch64
<size
, big_endian
>*,
3320 const elfcpp::Rela
<size
, big_endian
>&,
3323 const Symbol_value
<size
>*);
3325 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3327 const Relocate_info
<size
, big_endian
>*,
3328 Target_aarch64
<size
, big_endian
>*,
3329 const elfcpp::Rela
<size
, big_endian
>&,
3332 const Symbol_value
<size
>*,
3333 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3334 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3336 bool skip_call_tls_get_addr_
;
3338 }; // End of class Relocate
3340 // Adjust TLS relocation type based on the options and whether this
3341 // is a local symbol.
3342 static tls::Tls_optimization
3343 optimize_tls_reloc(bool is_final
, int r_type
);
3345 // Get the GOT section, creating it if necessary.
3346 Output_data_got_aarch64
<size
, big_endian
>*
3347 got_section(Symbol_table
*, Layout
*);
3349 // Get the GOT PLT section.
3351 got_plt_section() const
3353 gold_assert(this->got_plt_
!= NULL
);
3354 return this->got_plt_
;
3357 // Get the GOT section for TLSDESC entries.
3358 Output_data_got
<size
, big_endian
>*
3359 got_tlsdesc_section() const
3361 gold_assert(this->got_tlsdesc_
!= NULL
);
3362 return this->got_tlsdesc_
;
3365 // Create the PLT section.
3367 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3369 // Create a PLT entry for a global symbol.
3371 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3373 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3375 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3376 Sized_relobj_file
<size
, big_endian
>* relobj
,
3377 unsigned int local_sym_index
);
3379 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3381 define_tls_base_symbol(Symbol_table
*, Layout
*);
3383 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3385 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3387 // Create a GOT entry for the TLS module index.
3389 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3390 Sized_relobj_file
<size
, big_endian
>* object
);
3392 // Get the PLT section.
3393 Output_data_plt_aarch64
<size
, big_endian
>*
3396 gold_assert(this->plt_
!= NULL
);
3400 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3401 // ST_E_843419, we need an additional field for adrp offset.
3402 void create_erratum_stub(
3403 AArch64_relobj
<size
, big_endian
>* relobj
,
3405 section_size_type erratum_insn_offset
,
3406 Address erratum_address
,
3407 typename
Insn_utilities::Insntype erratum_insn
,
3409 unsigned int e843419_adrp_offset
=0);
3411 // Return whether this is a 3-insn erratum sequence.
3412 bool is_erratum_843419_sequence(
3413 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3414 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3415 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3417 // Return whether this is a 835769 sequence.
3418 // (Similarly implemented as in elfnn-aarch64.c.)
3419 bool is_erratum_835769_sequence(
3420 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3421 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3423 // Get the dynamic reloc section, creating it if necessary.
3425 rela_dyn_section(Layout
*);
3427 // Get the section to use for TLSDESC relocations.
3429 rela_tlsdesc_section(Layout
*) const;
3431 // Get the section to use for IRELATIVE relocations.
3433 rela_irelative_section(Layout
*);
3435 // Add a potential copy relocation.
3437 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3438 Sized_relobj_file
<size
, big_endian
>* object
,
3439 unsigned int shndx
, Output_section
* output_section
,
3440 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3442 unsigned int r_type
= elfcpp::elf_r_type
<size
>(reloc
.get_r_info());
3443 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3444 symtab
->get_sized_symbol
<size
>(sym
),
3445 object
, shndx
, output_section
,
3446 r_type
, reloc
.get_r_offset(),
3447 reloc
.get_r_addend(),
3448 this->rela_dyn_section(layout
));
3451 // Information about this specific target which we pass to the
3452 // general Target structure.
3453 static const Target::Target_info aarch64_info
;
3455 // The types of GOT entries needed for this platform.
3456 // These values are exposed to the ABI in an incremental link.
3457 // Do not renumber existing values without changing the version
3458 // number of the .gnu_incremental_inputs section.
3461 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3462 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3463 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3464 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3467 // This type is used as the argument to the target specific
3468 // relocation routines. The only target specific reloc is
3469 // R_AARCh64_TLSDESC against a local symbol.
3472 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3473 unsigned int a_r_sym
)
3474 : object(a_object
), r_sym(a_r_sym
)
3477 // The object in which the local symbol is defined.
3478 Sized_relobj_file
<size
, big_endian
>* object
;
3479 // The local symbol index in the object.
3484 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3486 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3487 // The GOT PLT section.
3488 Output_data_space
* got_plt_
;
3489 // The GOT section for IRELATIVE relocations.
3490 Output_data_space
* got_irelative_
;
3491 // The GOT section for TLSDESC relocations.
3492 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3493 // The _GLOBAL_OFFSET_TABLE_ symbol.
3494 Symbol
* global_offset_table_
;
3495 // The dynamic reloc section.
3496 Reloc_section
* rela_dyn_
;
3497 // The section to use for IRELATIVE relocs.
3498 Reloc_section
* rela_irelative_
;
3499 // Relocs saved to avoid a COPY reloc.
3500 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3501 // Offset of the GOT entry for the TLS module index.
3502 unsigned int got_mod_index_offset_
;
3503 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3504 // specific relocation. Here we store the object and local symbol
3505 // index for the relocation.
3506 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3507 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3508 bool tls_base_symbol_defined_
;
3509 // List of stub_tables
3510 Stub_table_list stub_tables_
;
3511 // Actual stub group size
3512 section_size_type stub_group_size_
;
3513 AArch64_input_section_map aarch64_input_section_map_
;
3514 }; // End of Target_aarch64
3518 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3521 false, // is_big_endian
3522 elfcpp::EM_AARCH64
, // machine_code
3523 false, // has_make_symbol
3524 false, // has_resolve
3525 false, // has_code_fill
3526 false, // is_default_stack_executable
3527 true, // can_icf_inline_merge_sections
3529 "/lib/ld.so.1", // program interpreter
3530 0x400000, // default_text_segment_address
3531 0x10000, // abi_pagesize (overridable by -z max-page-size)
3532 0x1000, // common_pagesize (overridable by -z common-page-size)
3533 false, // isolate_execinstr
3535 elfcpp::SHN_UNDEF
, // small_common_shndx
3536 elfcpp::SHN_UNDEF
, // large_common_shndx
3537 0, // small_common_section_flags
3538 0, // large_common_section_flags
3539 NULL
, // attributes_section
3540 NULL
, // attributes_vendor
3541 "_start", // entry_symbol_name
3542 32, // hash_entry_size
3546 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3549 false, // is_big_endian
3550 elfcpp::EM_AARCH64
, // machine_code
3551 false, // has_make_symbol
3552 false, // has_resolve
3553 false, // has_code_fill
3554 false, // is_default_stack_executable
3555 false, // can_icf_inline_merge_sections
3557 "/lib/ld.so.1", // program interpreter
3558 0x400000, // default_text_segment_address
3559 0x10000, // abi_pagesize (overridable by -z max-page-size)
3560 0x1000, // common_pagesize (overridable by -z common-page-size)
3561 false, // isolate_execinstr
3563 elfcpp::SHN_UNDEF
, // small_common_shndx
3564 elfcpp::SHN_UNDEF
, // large_common_shndx
3565 0, // small_common_section_flags
3566 0, // large_common_section_flags
3567 NULL
, // attributes_section
3568 NULL
, // attributes_vendor
3569 "_start", // entry_symbol_name
3570 32, // hash_entry_size
3574 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3577 true, // is_big_endian
3578 elfcpp::EM_AARCH64
, // machine_code
3579 false, // has_make_symbol
3580 false, // has_resolve
3581 false, // has_code_fill
3582 false, // is_default_stack_executable
3583 true, // can_icf_inline_merge_sections
3585 "/lib/ld.so.1", // program interpreter
3586 0x400000, // default_text_segment_address
3587 0x10000, // abi_pagesize (overridable by -z max-page-size)
3588 0x1000, // common_pagesize (overridable by -z common-page-size)
3589 false, // isolate_execinstr
3591 elfcpp::SHN_UNDEF
, // small_common_shndx
3592 elfcpp::SHN_UNDEF
, // large_common_shndx
3593 0, // small_common_section_flags
3594 0, // large_common_section_flags
3595 NULL
, // attributes_section
3596 NULL
, // attributes_vendor
3597 "_start", // entry_symbol_name
3598 32, // hash_entry_size
3602 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3605 true, // is_big_endian
3606 elfcpp::EM_AARCH64
, // machine_code
3607 false, // has_make_symbol
3608 false, // has_resolve
3609 false, // has_code_fill
3610 false, // is_default_stack_executable
3611 false, // can_icf_inline_merge_sections
3613 "/lib/ld.so.1", // program interpreter
3614 0x400000, // default_text_segment_address
3615 0x10000, // abi_pagesize (overridable by -z max-page-size)
3616 0x1000, // common_pagesize (overridable by -z common-page-size)
3617 false, // isolate_execinstr
3619 elfcpp::SHN_UNDEF
, // small_common_shndx
3620 elfcpp::SHN_UNDEF
, // large_common_shndx
3621 0, // small_common_section_flags
3622 0, // large_common_section_flags
3623 NULL
, // attributes_section
3624 NULL
, // attributes_vendor
3625 "_start", // entry_symbol_name
3626 32, // hash_entry_size
3629 // Get the GOT section, creating it if necessary.
3631 template<int size
, bool big_endian
>
3632 Output_data_got_aarch64
<size
, big_endian
>*
3633 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3636 if (this->got_
== NULL
)
3638 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3640 // When using -z now, we can treat .got.plt as a relro section.
3641 // Without -z now, it is modified after program startup by lazy
3643 bool is_got_plt_relro
= parameters
->options().now();
3644 Output_section_order got_order
= (is_got_plt_relro
3646 : ORDER_RELRO_LAST
);
3647 Output_section_order got_plt_order
= (is_got_plt_relro
3649 : ORDER_NON_RELRO_FIRST
);
3651 // Layout of .got and .got.plt sections.
3652 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3654 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3655 // .gotplt[1] reserved for ld.so (resolver)
3656 // .gotplt[2] reserved
3658 // Generate .got section.
3659 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3661 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3662 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3663 this->got_
, got_order
, true);
3664 // The first word of GOT is reserved for the address of .dynamic.
3665 // We put 0 here now. The value will be replaced later in
3666 // Output_data_got_aarch64::do_write.
3667 this->got_
->add_constant(0);
3669 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3670 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3671 // even if there is a .got.plt section.
3672 this->global_offset_table_
=
3673 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3674 Symbol_table::PREDEFINED
,
3676 0, 0, elfcpp::STT_OBJECT
,
3678 elfcpp::STV_HIDDEN
, 0,
3681 // Generate .got.plt section.
3682 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3683 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3685 | elfcpp::SHF_WRITE
),
3686 this->got_plt_
, got_plt_order
,
3689 // The first three entries are reserved.
3690 this->got_plt_
->set_current_data_size(
3691 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3693 // If there are any IRELATIVE relocations, they get GOT entries
3694 // in .got.plt after the jump slot entries.
3695 this->got_irelative_
= new Output_data_space(size
/ 8,
3696 "** GOT IRELATIVE PLT");
3697 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3699 | elfcpp::SHF_WRITE
),
3700 this->got_irelative_
,
3704 // If there are any TLSDESC relocations, they get GOT entries in
3705 // .got.plt after the jump slot and IRELATIVE entries.
3706 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3707 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3709 | elfcpp::SHF_WRITE
),
3714 if (!is_got_plt_relro
)
3716 // Those bytes can go into the relro segment.
3717 layout
->increase_relro(
3718 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3725 // Get the dynamic reloc section, creating it if necessary.
3727 template<int size
, bool big_endian
>
3728 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3729 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3731 if (this->rela_dyn_
== NULL
)
3733 gold_assert(layout
!= NULL
);
3734 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3735 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3736 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3737 ORDER_DYNAMIC_RELOCS
, false);
3739 return this->rela_dyn_
;
3742 // Get the section to use for IRELATIVE relocs, creating it if
3743 // necessary. These go in .rela.dyn, but only after all other dynamic
3744 // relocations. They need to follow the other dynamic relocations so
3745 // that they can refer to global variables initialized by those
3748 template<int size
, bool big_endian
>
3749 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3750 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3752 if (this->rela_irelative_
== NULL
)
3754 // Make sure we have already created the dynamic reloc section.
3755 this->rela_dyn_section(layout
);
3756 this->rela_irelative_
= new Reloc_section(false);
3757 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3758 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3759 ORDER_DYNAMIC_RELOCS
, false);
3760 gold_assert(this->rela_dyn_
->output_section()
3761 == this->rela_irelative_
->output_section());
3763 return this->rela_irelative_
;
3767 // do_make_elf_object to override the same function in the base class. We need
3768 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3769 // store backend specific information. Hence we need to have our own ELF object
3772 template<int size
, bool big_endian
>
3774 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3775 const std::string
& name
,
3776 Input_file
* input_file
,
3777 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3779 int et
= ehdr
.get_e_type();
3780 // ET_EXEC files are valid input for --just-symbols/-R,
3781 // and we treat them as relocatable objects.
3782 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3783 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3784 name
, input_file
, offset
, ehdr
);
3785 else if (et
== elfcpp::ET_REL
)
3787 AArch64_relobj
<size
, big_endian
>* obj
=
3788 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3792 else if (et
== elfcpp::ET_DYN
)
3794 // Keep base implementation.
3795 Sized_dynobj
<size
, big_endian
>* obj
=
3796 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3802 gold_error(_("%s: unsupported ELF file type %d"),
3809 // Scan a relocation for stub generation.
3811 template<int size
, bool big_endian
>
3813 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3814 const Relocate_info
<size
, big_endian
>* relinfo
,
3815 unsigned int r_type
,
3816 const Sized_symbol
<size
>* gsym
,
3818 const Symbol_value
<size
>* psymval
,
3819 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3822 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3823 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3825 Symbol_value
<size
> symval
;
3828 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3829 get_reloc_property(r_type
);
3830 if (gsym
->use_plt_offset(arp
->reference_flags()))
3832 // This uses a PLT, change the symbol value.
3833 symval
.set_output_value(this->plt_address_for_global(gsym
));
3836 else if (gsym
->is_undefined())
3838 // There is no need to generate a stub symbol if the original symbol
3840 gold_debug(DEBUG_TARGET
,
3841 "stub: not creating a stub for undefined symbol %s in file %s",
3842 gsym
->name(), aarch64_relobj
->name().c_str());
3847 // Get the symbol value.
3848 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3850 // Owing to pipelining, the PC relative branches below actually skip
3851 // two instructions when the branch offset is 0.
3852 Address destination
= static_cast<Address
>(-1);
3855 case elfcpp::R_AARCH64_CALL26
:
3856 case elfcpp::R_AARCH64_JUMP26
:
3857 destination
= value
+ addend
;
3863 int stub_type
= The_reloc_stub::
3864 stub_type_for_reloc(r_type
, address
, destination
);
3865 if (stub_type
== ST_NONE
)
3868 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3869 gold_assert(stub_table
!= NULL
);
3871 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3872 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3875 stub
= new The_reloc_stub(stub_type
);
3876 stub_table
->add_reloc_stub(stub
, key
);
3878 stub
->set_destination_address(destination
);
3879 } // End of Target_aarch64::scan_reloc_for_stub
3882 // This function scans a relocation section for stub generation.
3883 // The template parameter Relocate must be a class type which provides
3884 // a single function, relocate(), which implements the machine
3885 // specific part of a relocation.
3887 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3888 // SHT_REL or SHT_RELA.
3890 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3891 // of relocs. OUTPUT_SECTION is the output section.
3892 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3893 // mapped to output offsets.
3895 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3896 // VIEW_SIZE is the size. These refer to the input section, unless
3897 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3898 // the output section.
3900 template<int size
, bool big_endian
>
3901 template<int sh_type
>
3903 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3904 const Relocate_info
<size
, big_endian
>* relinfo
,
3905 const unsigned char* prelocs
,
3907 Output_section
* /*output_section*/,
3908 bool /*needs_special_offset_handling*/,
3909 const unsigned char* /*view*/,
3910 Address view_address
,
3913 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3915 const int reloc_size
=
3916 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3917 AArch64_relobj
<size
, big_endian
>* object
=
3918 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3919 unsigned int local_count
= object
->local_symbol_count();
3921 gold::Default_comdat_behavior default_comdat_behavior
;
3922 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3924 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3926 Reltype
reloc(prelocs
);
3927 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3928 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3929 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3930 if (r_type
!= elfcpp::R_AARCH64_CALL26
3931 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3934 section_offset_type offset
=
3935 convert_to_section_size_type(reloc
.get_r_offset());
3938 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3939 reloc
.get_r_addend();
3941 const Sized_symbol
<size
>* sym
;
3942 Symbol_value
<size
> symval
;
3943 const Symbol_value
<size
> *psymval
;
3944 bool is_defined_in_discarded_section
;
3946 if (r_sym
< local_count
)
3949 psymval
= object
->local_symbol(r_sym
);
3951 // If the local symbol belongs to a section we are discarding,
3952 // and that section is a debug section, try to find the
3953 // corresponding kept section and map this symbol to its
3954 // counterpart in the kept section. The symbol must not
3955 // correspond to a section we are folding.
3957 shndx
= psymval
->input_shndx(&is_ordinary
);
3958 is_defined_in_discarded_section
=
3960 && shndx
!= elfcpp::SHN_UNDEF
3961 && !object
->is_section_included(shndx
)
3962 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3964 // We need to compute the would-be final value of this local
3966 if (!is_defined_in_discarded_section
)
3968 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3969 if (psymval
->is_section_symbol())
3970 symval
.set_is_section_symbol();
3971 typename
ObjType::Compute_final_local_value_status status
=
3972 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3974 if (status
== ObjType::CFLV_OK
)
3976 // Currently we cannot handle a branch to a target in
3977 // a merged section. If this is the case, issue an error
3978 // and also free the merge symbol value.
3979 if (!symval
.has_output_value())
3981 const std::string
& section_name
=
3982 object
->section_name(shndx
);
3983 object
->error(_("cannot handle branch to local %u "
3984 "in a merged section %s"),
3985 r_sym
, section_name
.c_str());
3991 // We cannot determine the final value.
3999 gsym
= object
->global_symbol(r_sym
);
4000 gold_assert(gsym
!= NULL
);
4001 if (gsym
->is_forwarder())
4002 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
4004 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
4005 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
4006 symval
.set_output_symtab_index(sym
->symtab_index());
4008 symval
.set_no_output_symtab_entry();
4010 // We need to compute the would-be final value of this global
4012 const Symbol_table
* symtab
= relinfo
->symtab
;
4013 const Sized_symbol
<size
>* sized_symbol
=
4014 symtab
->get_sized_symbol
<size
>(gsym
);
4015 Symbol_table::Compute_final_value_status status
;
4016 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4017 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
4019 // Skip this if the symbol has not output section.
4020 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
4022 symval
.set_output_value(value
);
4024 if (gsym
->type() == elfcpp::STT_TLS
)
4025 symval
.set_is_tls_symbol();
4026 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
4027 symval
.set_is_ifunc_symbol();
4030 is_defined_in_discarded_section
=
4031 (gsym
->is_defined_in_discarded_section()
4032 && gsym
->is_undefined());
4036 Symbol_value
<size
> symval2
;
4037 if (is_defined_in_discarded_section
)
4039 if (comdat_behavior
== CB_UNDETERMINED
)
4041 std::string name
= object
->section_name(relinfo
->data_shndx
);
4042 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
4044 if (comdat_behavior
== CB_PRETEND
)
4047 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
4048 object
->map_to_kept_section(shndx
, &found
);
4050 symval2
.set_output_value(value
+ psymval
->input_value());
4052 symval2
.set_output_value(0);
4056 if (comdat_behavior
== CB_WARNING
)
4057 gold_warning_at_location(relinfo
, i
, offset
,
4058 _("relocation refers to discarded "
4060 symval2
.set_output_value(0);
4062 symval2
.set_no_output_symtab_entry();
4066 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
4067 addend
, view_address
+ offset
);
4068 } // End of iterating relocs in a section
4069 } // End of Target_aarch64::scan_reloc_section_for_stubs
4072 // Scan an input section for stub generation.
4074 template<int size
, bool big_endian
>
4076 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
4077 const Relocate_info
<size
, big_endian
>* relinfo
,
4078 unsigned int sh_type
,
4079 const unsigned char* prelocs
,
4081 Output_section
* output_section
,
4082 bool needs_special_offset_handling
,
4083 const unsigned char* view
,
4084 Address view_address
,
4085 section_size_type view_size
)
4087 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4088 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
4093 needs_special_offset_handling
,
4100 // Relocate a single reloc stub.
4102 template<int size
, bool big_endian
>
4103 void Target_aarch64
<size
, big_endian
>::
4104 relocate_reloc_stub(The_reloc_stub
* stub
,
4105 const The_relocate_info
*,
4107 unsigned char* view
,
4111 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
4112 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
4113 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
4115 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
4116 int insn_number
= stub
->insn_num();
4117 const uint32_t* insns
= stub
->insns();
4118 // Check the insns are really those stub insns.
4119 for (int i
= 0; i
< insn_number
; ++i
)
4121 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
4122 gold_assert(((uint32_t)insn
== insns
[i
]));
4125 Address dest
= stub
->destination_address();
4127 switch(stub
->type())
4129 case ST_ADRP_BRANCH
:
4131 // 1st reloc is ADR_PREL_PG_HI21
4132 The_reloc_functions_status status
=
4133 The_reloc_functions::adrp(view
, dest
, address
);
4134 // An error should never arise in the above step. If so, please
4135 // check 'aarch64_valid_for_adrp_p'.
4136 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4138 // 2nd reloc is ADD_ABS_LO12_NC
4139 const AArch64_reloc_property
* arp
=
4140 aarch64_reloc_property_table
->get_reloc_property(
4141 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
4142 gold_assert(arp
!= NULL
);
4143 status
= The_reloc_functions::template
4144 rela_general
<32>(view
+ 4, dest
, 0, arp
);
4145 // An error should never arise, it is an "_NC" relocation.
4146 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4150 case ST_LONG_BRANCH_ABS
:
4151 // 1st reloc is R_AARCH64_PREL64, at offset 8
4152 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
4155 case ST_LONG_BRANCH_PCREL
:
4157 // "PC" calculation is the 2nd insn in the stub.
4158 uint64_t offset
= dest
- (address
+ 4);
4159 // Offset is placed at offset 4 and 5.
4160 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
4170 // A class to handle the PLT data.
4171 // This is an abstract base class that handles most of the linker details
4172 // but does not know the actual contents of PLT entries. The derived
4173 // classes below fill in those details.
4175 template<int size
, bool big_endian
>
4176 class Output_data_plt_aarch64
: public Output_section_data
4179 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
4181 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4183 Output_data_plt_aarch64(Layout
* layout
,
4185 Output_data_got_aarch64
<size
, big_endian
>* got
,
4186 Output_data_space
* got_plt
,
4187 Output_data_space
* got_irelative
)
4188 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
4189 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
4190 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4191 { this->init(layout
); }
4193 // Initialize the PLT section.
4195 init(Layout
* layout
);
4197 // Add an entry to the PLT.
4199 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
4201 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4203 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
4204 Sized_relobj_file
<size
, big_endian
>* relobj
,
4205 unsigned int local_sym_index
);
4207 // Add the relocation for a PLT entry.
4209 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
4210 unsigned int got_offset
);
4212 // Add the reserved TLSDESC_PLT entry to the PLT.
4214 reserve_tlsdesc_entry(unsigned int got_offset
)
4215 { this->tlsdesc_got_offset_
= got_offset
; }
4217 // Return true if a TLSDESC_PLT entry has been reserved.
4219 has_tlsdesc_entry() const
4220 { return this->tlsdesc_got_offset_
!= -1U; }
4222 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4224 get_tlsdesc_got_offset() const
4225 { return this->tlsdesc_got_offset_
; }
4227 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4229 get_tlsdesc_plt_offset() const
4231 return (this->first_plt_entry_offset() +
4232 (this->count_
+ this->irelative_count_
)
4233 * this->get_plt_entry_size());
4236 // Return the .rela.plt section data.
4239 { return this->rel_
; }
4241 // Return where the TLSDESC relocations should go.
4243 rela_tlsdesc(Layout
*);
4245 // Return where the IRELATIVE relocations should go in the PLT
4248 rela_irelative(Symbol_table
*, Layout
*);
4250 // Return whether we created a section for IRELATIVE relocations.
4252 has_irelative_section() const
4253 { return this->irelative_rel_
!= NULL
; }
4255 // Return the number of PLT entries.
4258 { return this->count_
+ this->irelative_count_
; }
4260 // Return the offset of the first non-reserved PLT entry.
4262 first_plt_entry_offset() const
4263 { return this->do_first_plt_entry_offset(); }
4265 // Return the size of a PLT entry.
4267 get_plt_entry_size() const
4268 { return this->do_get_plt_entry_size(); }
4270 // Return the reserved tlsdesc entry size.
4272 get_plt_tlsdesc_entry_size() const
4273 { return this->do_get_plt_tlsdesc_entry_size(); }
4275 // Return the PLT address to use for a global symbol.
4277 address_for_global(const Symbol
*);
4279 // Return the PLT address to use for a local symbol.
4281 address_for_local(const Relobj
*, unsigned int symndx
);
4284 // Fill in the first PLT entry.
4286 fill_first_plt_entry(unsigned char* pov
,
4287 Address got_address
,
4288 Address plt_address
)
4289 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4291 // Fill in a normal PLT entry.
4293 fill_plt_entry(unsigned char* pov
,
4294 Address got_address
,
4295 Address plt_address
,
4296 unsigned int got_offset
,
4297 unsigned int plt_offset
)
4299 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4300 got_offset
, plt_offset
);
4303 // Fill in the reserved TLSDESC PLT entry.
4305 fill_tlsdesc_entry(unsigned char* pov
,
4306 Address gotplt_address
,
4307 Address plt_address
,
4309 unsigned int tlsdesc_got_offset
,
4310 unsigned int plt_offset
)
4312 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4313 tlsdesc_got_offset
, plt_offset
);
4316 virtual unsigned int
4317 do_first_plt_entry_offset() const = 0;
4319 virtual unsigned int
4320 do_get_plt_entry_size() const = 0;
4322 virtual unsigned int
4323 do_get_plt_tlsdesc_entry_size() const = 0;
4326 do_fill_first_plt_entry(unsigned char* pov
,
4328 Address plt_addr
) = 0;
4331 do_fill_plt_entry(unsigned char* pov
,
4332 Address got_address
,
4333 Address plt_address
,
4334 unsigned int got_offset
,
4335 unsigned int plt_offset
) = 0;
4338 do_fill_tlsdesc_entry(unsigned char* pov
,
4339 Address gotplt_address
,
4340 Address plt_address
,
4342 unsigned int tlsdesc_got_offset
,
4343 unsigned int plt_offset
) = 0;
4346 do_adjust_output_section(Output_section
* os
);
4348 // Write to a map file.
4350 do_print_to_mapfile(Mapfile
* mapfile
) const
4351 { mapfile
->print_output_data(this, _("** PLT")); }
4354 // Set the final size.
4356 set_final_data_size();
4358 // Write out the PLT data.
4360 do_write(Output_file
*);
4362 // The reloc section.
4363 Reloc_section
* rel_
;
4365 // The TLSDESC relocs, if necessary. These must follow the regular
4367 Reloc_section
* tlsdesc_rel_
;
4369 // The IRELATIVE relocs, if necessary. These must follow the
4370 // regular PLT relocations.
4371 Reloc_section
* irelative_rel_
;
4373 // The .got section.
4374 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4376 // The .got.plt section.
4377 Output_data_space
* got_plt_
;
4379 // The part of the .got.plt section used for IRELATIVE relocs.
4380 Output_data_space
* got_irelative_
;
4382 // The number of PLT entries.
4383 unsigned int count_
;
4385 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4386 // follow the regular PLT entries.
4387 unsigned int irelative_count_
;
4389 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4390 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4391 // indicates an offset is not allocated.
4392 unsigned int tlsdesc_got_offset_
;
4395 // Initialize the PLT section.
4397 template<int size
, bool big_endian
>
4399 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4401 this->rel_
= new Reloc_section(false);
4402 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4403 elfcpp::SHF_ALLOC
, this->rel_
,
4404 ORDER_DYNAMIC_PLT_RELOCS
, false);
4407 template<int size
, bool big_endian
>
4409 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4412 os
->set_entsize(this->get_plt_entry_size());
4415 // Add an entry to the PLT.
4417 template<int size
, bool big_endian
>
4419 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4420 Layout
* layout
, Symbol
* gsym
)
4422 gold_assert(!gsym
->has_plt_offset());
4424 unsigned int* pcount
;
4425 unsigned int plt_reserved
;
4426 Output_section_data_build
* got
;
4428 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4429 && gsym
->can_use_relative_reloc(false))
4431 pcount
= &this->irelative_count_
;
4433 got
= this->got_irelative_
;
4437 pcount
= &this->count_
;
4438 plt_reserved
= this->first_plt_entry_offset();
4439 got
= this->got_plt_
;
4442 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4447 section_offset_type got_offset
= got
->current_data_size();
4449 // Every PLT entry needs a GOT entry which points back to the PLT
4450 // entry (this will be changed by the dynamic linker, normally
4451 // lazily when the function is called).
4452 got
->set_current_data_size(got_offset
+ size
/ 8);
4454 // Every PLT entry needs a reloc.
4455 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4457 // Note that we don't need to save the symbol. The contents of the
4458 // PLT are independent of which symbols are used. The symbols only
4459 // appear in the relocations.
4462 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4465 template<int size
, bool big_endian
>
4467 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4468 Symbol_table
* symtab
,
4470 Sized_relobj_file
<size
, big_endian
>* relobj
,
4471 unsigned int local_sym_index
)
4473 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4474 ++this->irelative_count_
;
4476 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4478 // Every PLT entry needs a GOT entry which points back to the PLT
4480 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4482 // Every PLT entry needs a reloc.
4483 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4484 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4485 elfcpp::R_AARCH64_IRELATIVE
,
4486 this->got_irelative_
, got_offset
, 0);
4491 // Add the relocation for a PLT entry.
4493 template<int size
, bool big_endian
>
4495 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4496 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4498 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4499 && gsym
->can_use_relative_reloc(false))
4501 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4502 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4503 this->got_irelative_
, got_offset
, 0);
4507 gsym
->set_needs_dynsym_entry();
4508 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4513 // Return where the TLSDESC relocations should go, creating it if
4514 // necessary. These follow the JUMP_SLOT relocations.
4516 template<int size
, bool big_endian
>
4517 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4518 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4520 if (this->tlsdesc_rel_
== NULL
)
4522 this->tlsdesc_rel_
= new Reloc_section(false);
4523 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4524 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4525 ORDER_DYNAMIC_PLT_RELOCS
, false);
4526 gold_assert(this->tlsdesc_rel_
->output_section()
4527 == this->rel_
->output_section());
4529 return this->tlsdesc_rel_
;
4532 // Return where the IRELATIVE relocations should go in the PLT. These
4533 // follow the JUMP_SLOT and the TLSDESC relocations.
4535 template<int size
, bool big_endian
>
4536 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4537 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4540 if (this->irelative_rel_
== NULL
)
4542 // Make sure we have a place for the TLSDESC relocations, in
4543 // case we see any later on.
4544 this->rela_tlsdesc(layout
);
4545 this->irelative_rel_
= new Reloc_section(false);
4546 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4547 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4548 ORDER_DYNAMIC_PLT_RELOCS
, false);
4549 gold_assert(this->irelative_rel_
->output_section()
4550 == this->rel_
->output_section());
4552 if (parameters
->doing_static_link())
4554 // A statically linked executable will only have a .rela.plt
4555 // section to hold R_AARCH64_IRELATIVE relocs for
4556 // STT_GNU_IFUNC symbols. The library will use these
4557 // symbols to locate the IRELATIVE relocs at program startup
4559 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4560 Symbol_table::PREDEFINED
,
4561 this->irelative_rel_
, 0, 0,
4562 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4563 elfcpp::STV_HIDDEN
, 0, false, true);
4564 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4565 Symbol_table::PREDEFINED
,
4566 this->irelative_rel_
, 0, 0,
4567 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4568 elfcpp::STV_HIDDEN
, 0, true, true);
4571 return this->irelative_rel_
;
4574 // Return the PLT address to use for a global symbol.
4576 template<int size
, bool big_endian
>
4578 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4581 uint64_t offset
= 0;
4582 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4583 && gsym
->can_use_relative_reloc(false))
4584 offset
= (this->first_plt_entry_offset() +
4585 this->count_
* this->get_plt_entry_size());
4586 return this->address() + offset
+ gsym
->plt_offset();
4589 // Return the PLT address to use for a local symbol. These are always
4590 // IRELATIVE relocs.
4592 template<int size
, bool big_endian
>
4594 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4595 const Relobj
* object
,
4598 return (this->address()
4599 + this->first_plt_entry_offset()
4600 + this->count_
* this->get_plt_entry_size()
4601 + object
->local_plt_offset(r_sym
));
4604 // Set the final size.
4606 template<int size
, bool big_endian
>
4608 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4610 unsigned int count
= this->count_
+ this->irelative_count_
;
4611 unsigned int extra_size
= 0;
4612 if (this->has_tlsdesc_entry())
4613 extra_size
+= this->get_plt_tlsdesc_entry_size();
4614 this->set_data_size(this->first_plt_entry_offset()
4615 + count
* this->get_plt_entry_size()
4619 template<int size
, bool big_endian
>
4620 class Output_data_plt_aarch64_standard
:
4621 public Output_data_plt_aarch64
<size
, big_endian
>
4624 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4625 Output_data_plt_aarch64_standard(
4627 Output_data_got_aarch64
<size
, big_endian
>* got
,
4628 Output_data_space
* got_plt
,
4629 Output_data_space
* got_irelative
)
4630 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4637 // Return the offset of the first non-reserved PLT entry.
4638 virtual unsigned int
4639 do_first_plt_entry_offset() const
4640 { return this->first_plt_entry_size
; }
4642 // Return the size of a PLT entry
4643 virtual unsigned int
4644 do_get_plt_entry_size() const
4645 { return this->plt_entry_size
; }
4647 // Return the size of a tlsdesc entry
4648 virtual unsigned int
4649 do_get_plt_tlsdesc_entry_size() const
4650 { return this->plt_tlsdesc_entry_size
; }
4653 do_fill_first_plt_entry(unsigned char* pov
,
4654 Address got_address
,
4655 Address plt_address
);
4658 do_fill_plt_entry(unsigned char* pov
,
4659 Address got_address
,
4660 Address plt_address
,
4661 unsigned int got_offset
,
4662 unsigned int plt_offset
);
4665 do_fill_tlsdesc_entry(unsigned char* pov
,
4666 Address gotplt_address
,
4667 Address plt_address
,
4669 unsigned int tlsdesc_got_offset
,
4670 unsigned int plt_offset
);
4673 // The size of the first plt entry size.
4674 static const int first_plt_entry_size
= 32;
4675 // The size of the plt entry size.
4676 static const int plt_entry_size
= 16;
4677 // The size of the plt tlsdesc entry size.
4678 static const int plt_tlsdesc_entry_size
= 32;
4679 // Template for the first PLT entry.
4680 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4681 // Template for subsequent PLT entries.
4682 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4683 // The reserved TLSDESC entry in the PLT for an executable.
4684 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4687 // The first entry in the PLT for an executable.
4691 Output_data_plt_aarch64_standard
<32, false>::
4692 first_plt_entry
[first_plt_entry_size
/ 4] =
4694 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4695 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4696 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4697 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4698 0xd61f0220, /* br x17 */
4699 0xd503201f, /* nop */
4700 0xd503201f, /* nop */
4701 0xd503201f, /* nop */
4707 Output_data_plt_aarch64_standard
<32, true>::
4708 first_plt_entry
[first_plt_entry_size
/ 4] =
4710 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4711 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4712 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4713 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4714 0xd61f0220, /* br x17 */
4715 0xd503201f, /* nop */
4716 0xd503201f, /* nop */
4717 0xd503201f, /* nop */
4723 Output_data_plt_aarch64_standard
<64, false>::
4724 first_plt_entry
[first_plt_entry_size
/ 4] =
4726 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4727 0x90000010, /* adrp x16, PLT_GOT+16 */
4728 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4729 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4730 0xd61f0220, /* br x17 */
4731 0xd503201f, /* nop */
4732 0xd503201f, /* nop */
4733 0xd503201f, /* nop */
4739 Output_data_plt_aarch64_standard
<64, true>::
4740 first_plt_entry
[first_plt_entry_size
/ 4] =
4742 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4743 0x90000010, /* adrp x16, PLT_GOT+16 */
4744 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4745 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4746 0xd61f0220, /* br x17 */
4747 0xd503201f, /* nop */
4748 0xd503201f, /* nop */
4749 0xd503201f, /* nop */
4755 Output_data_plt_aarch64_standard
<32, false>::
4756 plt_entry
[plt_entry_size
/ 4] =
4758 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4759 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4760 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4761 0xd61f0220, /* br x17. */
4767 Output_data_plt_aarch64_standard
<32, true>::
4768 plt_entry
[plt_entry_size
/ 4] =
4770 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4771 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4772 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4773 0xd61f0220, /* br x17. */
4779 Output_data_plt_aarch64_standard
<64, false>::
4780 plt_entry
[plt_entry_size
/ 4] =
4782 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4783 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4784 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4785 0xd61f0220, /* br x17. */
4791 Output_data_plt_aarch64_standard
<64, true>::
4792 plt_entry
[plt_entry_size
/ 4] =
4794 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4795 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4796 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4797 0xd61f0220, /* br x17. */
4801 template<int size
, bool big_endian
>
4803 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4805 Address got_address
,
4806 Address plt_address
)
4808 // PLT0 of the small PLT looks like this in ELF64 -
4809 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4810 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4811 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4813 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4814 // GOTPLT entry for this.
4816 // PLT0 will be slightly different in ELF32 due to different got entry
4818 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4819 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4821 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4822 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4823 // FIXME: This only works for 64bit
4824 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4825 gotplt_2nd_ent
, plt_address
+ 4);
4827 // Fill in R_AARCH64_LDST8_LO12
4828 elfcpp::Swap
<32, big_endian
>::writeval(
4830 ((this->first_plt_entry
[2] & 0xffc003ff)
4831 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4833 // Fill in R_AARCH64_ADD_ABS_LO12
4834 elfcpp::Swap
<32, big_endian
>::writeval(
4836 ((this->first_plt_entry
[3] & 0xffc003ff)
4837 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4841 // Subsequent entries in the PLT for an executable.
4842 // FIXME: This only works for 64bit
4844 template<int size
, bool big_endian
>
4846 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4848 Address got_address
,
4849 Address plt_address
,
4850 unsigned int got_offset
,
4851 unsigned int plt_offset
)
4853 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4855 Address gotplt_entry_address
= got_address
+ got_offset
;
4856 Address plt_entry_address
= plt_address
+ plt_offset
;
4858 // Fill in R_AARCH64_PCREL_ADR_HI21
4859 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4861 gotplt_entry_address
,
4864 // Fill in R_AARCH64_LDST64_ABS_LO12
4865 elfcpp::Swap
<32, big_endian
>::writeval(
4867 ((this->plt_entry
[1] & 0xffc003ff)
4868 | ((gotplt_entry_address
& 0xff8) << 7)));
4870 // Fill in R_AARCH64_ADD_ABS_LO12
4871 elfcpp::Swap
<32, big_endian
>::writeval(
4873 ((this->plt_entry
[2] & 0xffc003ff)
4874 | ((gotplt_entry_address
& 0xfff) <<10)));
4881 Output_data_plt_aarch64_standard
<32, false>::
4882 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4884 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4885 0x90000002, /* adrp x2, 0 */
4886 0x90000003, /* adrp x3, 0 */
4887 0xb9400042, /* ldr w2, [w2, #0] */
4888 0x11000063, /* add w3, w3, 0 */
4889 0xd61f0040, /* br x2 */
4890 0xd503201f, /* nop */
4891 0xd503201f, /* nop */
4896 Output_data_plt_aarch64_standard
<32, true>::
4897 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4899 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4900 0x90000002, /* adrp x2, 0 */
4901 0x90000003, /* adrp x3, 0 */
4902 0xb9400042, /* ldr w2, [w2, #0] */
4903 0x11000063, /* add w3, w3, 0 */
4904 0xd61f0040, /* br x2 */
4905 0xd503201f, /* nop */
4906 0xd503201f, /* nop */
4911 Output_data_plt_aarch64_standard
<64, false>::
4912 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4914 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4915 0x90000002, /* adrp x2, 0 */
4916 0x90000003, /* adrp x3, 0 */
4917 0xf9400042, /* ldr x2, [x2, #0] */
4918 0x91000063, /* add x3, x3, 0 */
4919 0xd61f0040, /* br x2 */
4920 0xd503201f, /* nop */
4921 0xd503201f, /* nop */
4926 Output_data_plt_aarch64_standard
<64, true>::
4927 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4929 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4930 0x90000002, /* adrp x2, 0 */
4931 0x90000003, /* adrp x3, 0 */
4932 0xf9400042, /* ldr x2, [x2, #0] */
4933 0x91000063, /* add x3, x3, 0 */
4934 0xd61f0040, /* br x2 */
4935 0xd503201f, /* nop */
4936 0xd503201f, /* nop */
4939 template<int size
, bool big_endian
>
4941 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4943 Address gotplt_address
,
4944 Address plt_address
,
4946 unsigned int tlsdesc_got_offset
,
4947 unsigned int plt_offset
)
4949 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4951 // move DT_TLSDESC_GOT address into x2
4952 // move .got.plt address into x3
4953 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4954 Address plt_entry_address
= plt_address
+ plt_offset
;
4956 // R_AARCH64_ADR_PREL_PG_HI21
4957 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4960 plt_entry_address
+ 4);
4962 // R_AARCH64_ADR_PREL_PG_HI21
4963 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4966 plt_entry_address
+ 8);
4968 // R_AARCH64_LDST64_ABS_LO12
4969 elfcpp::Swap
<32, big_endian
>::writeval(
4971 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4972 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4974 // R_AARCH64_ADD_ABS_LO12
4975 elfcpp::Swap
<32, big_endian
>::writeval(
4977 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
4978 | ((gotplt_address
& 0xfff) << 10)));
4981 // Write out the PLT. This uses the hand-coded instructions above,
4982 // and adjusts them as needed. This is specified by the AMD64 ABI.
4984 template<int size
, bool big_endian
>
4986 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
4988 const off_t offset
= this->offset();
4989 const section_size_type oview_size
=
4990 convert_to_section_size_type(this->data_size());
4991 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
4993 const off_t got_file_offset
= this->got_plt_
->offset();
4994 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
4995 == this->got_irelative_
->offset());
4997 const section_size_type got_size
=
4998 convert_to_section_size_type(this->got_plt_
->data_size()
4999 + this->got_irelative_
->data_size());
5000 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
5003 unsigned char* pov
= oview
;
5005 // The base address of the .plt section.
5006 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
5007 // The base address of the PLT portion of the .got section.
5008 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
5009 = this->got_plt_
->address();
5011 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
5012 pov
+= this->first_plt_entry_offset();
5014 // The first three entries in .got.plt are reserved.
5015 unsigned char* got_pov
= got_view
;
5016 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
5017 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5019 unsigned int plt_offset
= this->first_plt_entry_offset();
5020 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
5021 const unsigned int count
= this->count_
+ this->irelative_count_
;
5022 for (unsigned int plt_index
= 0;
5025 pov
+= this->get_plt_entry_size(),
5026 got_pov
+= size
/ 8,
5027 plt_offset
+= this->get_plt_entry_size(),
5028 got_offset
+= size
/ 8)
5030 // Set and adjust the PLT entry itself.
5031 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
5032 got_offset
, plt_offset
);
5034 // Set the entry in the GOT, which points to plt0.
5035 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
5038 if (this->has_tlsdesc_entry())
5040 // Set and adjust the reserved TLSDESC PLT entry.
5041 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
5042 // The base address of the .base section.
5043 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
5044 this->got_
->address();
5045 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
5046 tlsdesc_got_offset
, plt_offset
);
5047 pov
+= this->get_plt_tlsdesc_entry_size();
5050 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
5051 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
5053 of
->write_output_view(offset
, oview_size
, oview
);
5054 of
->write_output_view(got_file_offset
, got_size
, got_view
);
5057 // Telling how to update the immediate field of an instruction.
5058 struct AArch64_howto
5060 // The immediate field mask.
5061 elfcpp::Elf_Xword dst_mask
;
5063 // The offset to apply relocation immediate
5066 // The second part offset, if the immediate field has two parts.
5067 // -1 if the immediate field has only one part.
5071 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
5073 {0, -1, -1}, // DATA
5074 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
5075 {0xffffe0, 5, -1}, // LD [23:5]-imm19
5076 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
5077 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
5078 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
5079 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
5080 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
5081 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
5082 {0x3ffffff, 0, -1}, // B [25:0]-imm26
5083 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
5086 // AArch64 relocate function class
5088 template<int size
, bool big_endian
>
5089 class AArch64_relocate_functions
5094 STATUS_OKAY
, // No error during relocation.
5095 STATUS_OVERFLOW
, // Relocation overflow.
5096 STATUS_BAD_RELOC
, // Relocation cannot be applied.
5099 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
5100 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
5101 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
5102 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
5103 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
5104 typedef Stub_table
<size
, big_endian
> The_stub_table
;
5105 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
5106 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
5108 // Return the page address of the address.
5109 // Page(address) = address & ~0xFFF
5111 static inline AArch64_valtype
5112 Page(Address address
)
5114 return (address
& (~static_cast<Address
>(0xFFF)));
5118 // Update instruction (pointed by view) with selected bits (immed).
5119 // val = (val & ~dst_mask) | (immed << doffset)
5121 template<int valsize
>
5123 update_view(unsigned char* view
,
5124 AArch64_valtype immed
,
5125 elfcpp::Elf_Xword doffset
,
5126 elfcpp::Elf_Xword dst_mask
)
5128 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5129 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5130 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5132 // Clear immediate fields.
5134 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5135 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5138 // Update two parts of an instruction (pointed by view) with selected
5139 // bits (immed1 and immed2).
5140 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5142 template<int valsize
>
5144 update_view_two_parts(
5145 unsigned char* view
,
5146 AArch64_valtype immed1
,
5147 AArch64_valtype immed2
,
5148 elfcpp::Elf_Xword doffset1
,
5149 elfcpp::Elf_Xword doffset2
,
5150 elfcpp::Elf_Xword dst_mask
)
5152 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5153 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5154 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5156 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5157 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
5158 (immed2
<< doffset2
)));
5161 // Update adr or adrp instruction with immed.
5162 // In adr and adrp: [30:29] immlo [23:5] immhi
5165 update_adr(unsigned char* view
, AArch64_valtype immed
)
5167 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
5168 This::template update_view_two_parts
<32>(
5171 (immed
& 0x1ffffc) >> 2,
5177 // Update movz/movn instruction with bits immed.
5178 // Set instruction to movz if is_movz is true, otherwise set instruction
5182 update_movnz(unsigned char* view
,
5183 AArch64_valtype immed
,
5186 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
5187 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5188 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
5190 const elfcpp::Elf_Xword doffset
=
5191 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
5192 const elfcpp::Elf_Xword dst_mask
=
5193 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
5195 // Clear immediate fields and opc code.
5196 val
&= ~(dst_mask
| (0x3 << 29));
5198 // Set instruction to movz or movn.
5199 // movz: [30:29] is 10 movn: [30:29] is 00
5203 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
5204 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5209 // Update selected bits in text.
5211 template<int valsize
>
5212 static inline typename
This::Status
5213 reloc_common(unsigned char* view
, Address x
,
5214 const AArch64_reloc_property
* reloc_property
)
5216 // Select bits from X.
5217 Address immed
= reloc_property
->select_x_value(x
);
5220 const AArch64_reloc_property::Reloc_inst inst
=
5221 reloc_property
->reloc_inst();
5222 // If it is a data relocation or instruction has 2 parts of immediate
5223 // fields, you should not call pcrela_general.
5224 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
5225 aarch64_howto
[inst
].doffset
!= -1);
5226 This::template update_view
<valsize
>(view
, immed
,
5227 aarch64_howto
[inst
].doffset
,
5228 aarch64_howto
[inst
].dst_mask
);
5230 // Do check overflow or alignment if needed.
5231 return (reloc_property
->checkup_x_value(x
)
5233 : This::STATUS_OVERFLOW
);
5236 // Construct a B insn. Note, although we group it here with other relocation
5237 // operation, there is actually no 'relocation' involved here.
5239 construct_b(unsigned char* view
, unsigned int branch_offset
)
5241 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5245 // Do a simple rela relocation at unaligned addresses.
5247 template<int valsize
>
5248 static inline typename
This::Status
5249 rela_ua(unsigned char* view
,
5250 const Sized_relobj_file
<size
, big_endian
>* object
,
5251 const Symbol_value
<size
>* psymval
,
5252 AArch64_valtype addend
,
5253 const AArch64_reloc_property
* reloc_property
)
5255 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5257 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5258 psymval
->value(object
, addend
);
5259 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5260 static_cast<Valtype
>(x
));
5261 return (reloc_property
->checkup_x_value(x
)
5263 : This::STATUS_OVERFLOW
);
5266 // Do a simple pc-relative relocation at unaligned addresses.
5268 template<int valsize
>
5269 static inline typename
This::Status
5270 pcrela_ua(unsigned char* view
,
5271 const Sized_relobj_file
<size
, big_endian
>* object
,
5272 const Symbol_value
<size
>* psymval
,
5273 AArch64_valtype addend
,
5275 const AArch64_reloc_property
* reloc_property
)
5277 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5279 Address x
= psymval
->value(object
, addend
) - address
;
5280 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5281 static_cast<Valtype
>(x
));
5282 return (reloc_property
->checkup_x_value(x
)
5284 : This::STATUS_OVERFLOW
);
5287 // Do a simple rela relocation at aligned addresses.
5289 template<int valsize
>
5290 static inline typename
This::Status
5292 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 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5299 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5300 Address x
= psymval
->value(object
, addend
);
5301 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5302 return (reloc_property
->checkup_x_value(x
)
5304 : This::STATUS_OVERFLOW
);
5307 // Do relocate. Update selected bits in text.
5308 // new_val = (val & ~dst_mask) | (immed << doffset)
5310 template<int valsize
>
5311 static inline typename
This::Status
5312 rela_general(unsigned char* view
,
5313 const Sized_relobj_file
<size
, big_endian
>* object
,
5314 const Symbol_value
<size
>* psymval
,
5315 AArch64_valtype addend
,
5316 const AArch64_reloc_property
* reloc_property
)
5318 // Calculate relocation.
5319 Address x
= psymval
->value(object
, addend
);
5320 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5323 // Do relocate. Update selected bits in text.
5324 // new val = (val & ~dst_mask) | (immed << doffset)
5326 template<int valsize
>
5327 static inline typename
This::Status
5329 unsigned char* view
,
5331 AArch64_valtype addend
,
5332 const AArch64_reloc_property
* reloc_property
)
5334 // Calculate relocation.
5335 Address x
= s
+ addend
;
5336 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5339 // Do address relative relocate. Update selected bits in text.
5340 // new val = (val & ~dst_mask) | (immed << doffset)
5342 template<int valsize
>
5343 static inline typename
This::Status
5345 unsigned char* view
,
5346 const Sized_relobj_file
<size
, big_endian
>* object
,
5347 const Symbol_value
<size
>* psymval
,
5348 AArch64_valtype addend
,
5350 const AArch64_reloc_property
* reloc_property
)
5352 // Calculate relocation.
5353 Address x
= psymval
->value(object
, addend
) - address
;
5354 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5358 // Calculate (S + A) - address, update adr instruction.
5360 static inline typename
This::Status
5361 adr(unsigned char* view
,
5362 const Sized_relobj_file
<size
, big_endian
>* object
,
5363 const Symbol_value
<size
>* psymval
,
5366 const AArch64_reloc_property
* /* reloc_property */)
5368 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5369 // Pick bits [20:0] of X.
5370 AArch64_valtype immed
= x
& 0x1fffff;
5371 update_adr(view
, immed
);
5372 // Check -2^20 <= X < 2^20
5373 return (size
== 64 && Bits
<21>::has_overflow((x
))
5374 ? This::STATUS_OVERFLOW
5375 : This::STATUS_OKAY
);
5378 // Calculate PG(S+A) - PG(address), update adrp instruction.
5379 // R_AARCH64_ADR_PREL_PG_HI21
5381 static inline typename
This::Status
5383 unsigned char* view
,
5387 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5388 // Pick [32:12] of X.
5389 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5390 update_adr(view
, immed
);
5391 // Check -2^32 <= X < 2^32
5392 return (size
== 64 && Bits
<33>::has_overflow((x
))
5393 ? This::STATUS_OVERFLOW
5394 : This::STATUS_OKAY
);
5397 // Calculate PG(S+A) - PG(address), update adrp instruction.
5398 // R_AARCH64_ADR_PREL_PG_HI21
5400 static inline typename
This::Status
5401 adrp(unsigned char* view
,
5402 const Sized_relobj_file
<size
, big_endian
>* object
,
5403 const Symbol_value
<size
>* psymval
,
5406 const AArch64_reloc_property
* reloc_property
)
5408 Address sa
= psymval
->value(object
, addend
);
5409 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5410 // Pick [32:12] of X.
5411 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5412 update_adr(view
, immed
);
5413 return (reloc_property
->checkup_x_value(x
)
5415 : This::STATUS_OVERFLOW
);
5418 // Update mov[n/z] instruction. Check overflow if needed.
5419 // If X >=0, set the instruction to movz and its immediate value to the
5421 // If X < 0, set the instruction to movn and its immediate value to
5422 // NOT (selected bits of).
5424 static inline typename
This::Status
5425 movnz(unsigned char* view
,
5427 const AArch64_reloc_property
* reloc_property
)
5429 // Select bits from X.
5432 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5433 if (static_cast<SignedW
>(x
) >= 0)
5435 immed
= reloc_property
->select_x_value(x
);
5440 immed
= reloc_property
->select_x_value(~x
);;
5444 // Update movnz instruction.
5445 update_movnz(view
, immed
, is_movz
);
5447 // Do check overflow or alignment if needed.
5448 return (reloc_property
->checkup_x_value(x
)
5450 : This::STATUS_OVERFLOW
);
5454 maybe_apply_stub(unsigned int,
5455 const The_relocate_info
*,
5459 const Sized_symbol
<size
>*,
5460 const Symbol_value
<size
>*,
5461 const Sized_relobj_file
<size
, big_endian
>*,
5464 }; // End of AArch64_relocate_functions
5467 // For a certain relocation type (usually jump/branch), test to see if the
5468 // destination needs a stub to fulfil. If so, re-route the destination of the
5469 // original instruction to the stub, note, at this time, the stub has already
5472 template<int size
, bool big_endian
>
5474 AArch64_relocate_functions
<size
, big_endian
>::
5475 maybe_apply_stub(unsigned int r_type
,
5476 const The_relocate_info
* relinfo
,
5477 const The_rela
& rela
,
5478 unsigned char* view
,
5480 const Sized_symbol
<size
>* gsym
,
5481 const Symbol_value
<size
>* psymval
,
5482 const Sized_relobj_file
<size
, big_endian
>* object
,
5483 section_size_type current_group_size
)
5485 if (parameters
->options().relocatable())
5488 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5489 Address branch_target
= psymval
->value(object
, 0) + addend
;
5491 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5492 if (stub_type
== ST_NONE
)
5495 const The_aarch64_relobj
* aarch64_relobj
=
5496 static_cast<const The_aarch64_relobj
*>(object
);
5497 const AArch64_reloc_property
* arp
=
5498 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5499 gold_assert(arp
!= NULL
);
5501 // We don't create stubs for undefined symbols, but do for weak.
5503 && !gsym
->use_plt_offset(arp
->reference_flags())
5504 && gsym
->is_undefined())
5506 gold_debug(DEBUG_TARGET
,
5507 "stub: looking for a stub for undefined symbol %s in file %s",
5508 gsym
->name(), aarch64_relobj
->name().c_str());
5512 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5513 gold_assert(stub_table
!= NULL
);
5515 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5516 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5517 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5518 gold_assert(stub
!= NULL
);
5520 Address new_branch_target
= stub_table
->address() + stub
->offset();
5521 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5522 new_branch_target
- address
;
5523 typename
This::Status status
= This::template
5524 rela_general
<32>(view
, branch_offset
, 0, arp
);
5525 if (status
!= This::STATUS_OKAY
)
5526 gold_error(_("Stub is too far away, try a smaller value "
5527 "for '--stub-group-size'. The current value is 0x%lx."),
5528 static_cast<unsigned long>(current_group_size
));
5533 // Group input sections for stub generation.
5535 // We group input sections in an output section so that the total size,
5536 // including any padding space due to alignment is smaller than GROUP_SIZE
5537 // unless the only input section in group is bigger than GROUP_SIZE already.
5538 // Then an ARM stub table is created to follow the last input section
5539 // in group. For each group an ARM stub table is created an is placed
5540 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5541 // extend the group after the stub table.
5543 template<int size
, bool big_endian
>
5545 Target_aarch64
<size
, big_endian
>::group_sections(
5547 section_size_type group_size
,
5548 bool stubs_always_after_branch
,
5551 // Group input sections and insert stub table
5552 Layout::Section_list section_list
;
5553 layout
->get_executable_sections(§ion_list
);
5554 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5555 p
!= section_list
.end();
5558 AArch64_output_section
<size
, big_endian
>* output_section
=
5559 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5560 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5566 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5567 // section of RELOBJ.
5569 template<int size
, bool big_endian
>
5570 AArch64_input_section
<size
, big_endian
>*
5571 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5572 Relobj
* relobj
, unsigned int shndx
) const
5574 Section_id
sid(relobj
, shndx
);
5575 typename
AArch64_input_section_map::const_iterator p
=
5576 this->aarch64_input_section_map_
.find(sid
);
5577 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5581 // Make a new AArch64_input_section object.
5583 template<int size
, bool big_endian
>
5584 AArch64_input_section
<size
, big_endian
>*
5585 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5586 Relobj
* relobj
, unsigned int shndx
)
5588 Section_id
sid(relobj
, shndx
);
5590 AArch64_input_section
<size
, big_endian
>* input_section
=
5591 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5592 input_section
->init();
5594 // Register new AArch64_input_section in map for look-up.
5595 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5596 this->aarch64_input_section_map_
.insert(
5597 std::make_pair(sid
, input_section
));
5599 // Make sure that it we have not created another AArch64_input_section
5600 // for this input section already.
5601 gold_assert(ins
.second
);
5603 return input_section
;
5607 // Relaxation hook. This is where we do stub generation.
5609 template<int size
, bool big_endian
>
5611 Target_aarch64
<size
, big_endian
>::do_relax(
5613 const Input_objects
* input_objects
,
5614 Symbol_table
* symtab
,
5618 gold_assert(!parameters
->options().relocatable());
5621 // We don't handle negative stub_group_size right now.
5622 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5623 if (this->stub_group_size_
== 1)
5625 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5626 // will fail to link. The user will have to relink with an explicit
5627 // group size option.
5628 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5631 group_sections(layout
, this->stub_group_size_
, true, task
);
5635 // If this is not the first pass, addresses and file offsets have
5636 // been reset at this point, set them here.
5637 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5638 sp
!= this->stub_tables_
.end(); ++sp
)
5640 The_stub_table
* stt
= *sp
;
5641 The_aarch64_input_section
* owner
= stt
->owner();
5642 off_t off
= align_address(owner
->original_size(),
5644 stt
->set_address_and_file_offset(owner
->address() + off
,
5645 owner
->offset() + off
);
5649 // Scan relocs for relocation stubs
5650 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5651 op
!= input_objects
->relobj_end();
5654 The_aarch64_relobj
* aarch64_relobj
=
5655 static_cast<The_aarch64_relobj
*>(*op
);
5656 // Lock the object so we can read from it. This is only called
5657 // single-threaded from Layout::finalize, so it is OK to lock.
5658 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5659 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5662 bool any_stub_table_changed
= false;
5663 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5664 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5666 The_stub_table
* stub_table
= *siter
;
5667 if (stub_table
->update_data_size_changed_p())
5669 The_aarch64_input_section
* owner
= stub_table
->owner();
5670 uint64_t address
= owner
->address();
5671 off_t offset
= owner
->offset();
5672 owner
->reset_address_and_file_offset();
5673 owner
->set_address_and_file_offset(address
, offset
);
5675 any_stub_table_changed
= true;
5679 // Do not continue relaxation.
5680 bool continue_relaxation
= any_stub_table_changed
;
5681 if (!continue_relaxation
)
5682 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5683 (sp
!= this->stub_tables_
.end());
5685 (*sp
)->finalize_stubs();
5687 return continue_relaxation
;
5691 // Make a new Stub_table.
5693 template<int size
, bool big_endian
>
5694 Stub_table
<size
, big_endian
>*
5695 Target_aarch64
<size
, big_endian
>::new_stub_table(
5696 AArch64_input_section
<size
, big_endian
>* owner
)
5698 Stub_table
<size
, big_endian
>* stub_table
=
5699 new Stub_table
<size
, big_endian
>(owner
);
5700 stub_table
->set_address(align_address(
5701 owner
->address() + owner
->data_size(), 8));
5702 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5703 stub_table
->finalize_data_size();
5705 this->stub_tables_
.push_back(stub_table
);
5711 template<int size
, bool big_endian
>
5713 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5714 void* arg
, unsigned int r_type
, uint64_t) const
5716 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5717 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5718 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5719 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5720 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5721 gold_assert(psymval
->is_tls_symbol());
5722 // The value of a TLS symbol is the offset in the TLS segment.
5723 return psymval
->value(ti
.object
, 0);
5726 // Return the number of entries in the PLT.
5728 template<int size
, bool big_endian
>
5730 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5732 if (this->plt_
== NULL
)
5734 return this->plt_
->entry_count();
5737 // Return the offset of the first non-reserved PLT entry.
5739 template<int size
, bool big_endian
>
5741 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5743 return this->plt_
->first_plt_entry_offset();
5746 // Return the size of each PLT entry.
5748 template<int size
, bool big_endian
>
5750 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5752 return this->plt_
->get_plt_entry_size();
5755 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5757 template<int size
, bool big_endian
>
5759 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5760 Symbol_table
* symtab
, Layout
* layout
)
5762 if (this->tls_base_symbol_defined_
)
5765 Output_segment
* tls_segment
= layout
->tls_segment();
5766 if (tls_segment
!= NULL
)
5768 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5769 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5770 Symbol_table::PREDEFINED
,
5774 elfcpp::STV_HIDDEN
, 0,
5775 Symbol::SEGMENT_START
,
5778 this->tls_base_symbol_defined_
= true;
5781 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5783 template<int size
, bool big_endian
>
5785 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5786 Symbol_table
* symtab
, Layout
* layout
)
5788 if (this->plt_
== NULL
)
5789 this->make_plt_section(symtab
, layout
);
5791 if (!this->plt_
->has_tlsdesc_entry())
5793 // Allocate the TLSDESC_GOT entry.
5794 Output_data_got_aarch64
<size
, big_endian
>* got
=
5795 this->got_section(symtab
, layout
);
5796 unsigned int got_offset
= got
->add_constant(0);
5798 // Allocate the TLSDESC_PLT entry.
5799 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5803 // Create a GOT entry for the TLS module index.
5805 template<int size
, bool big_endian
>
5807 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5808 Symbol_table
* symtab
, Layout
* layout
,
5809 Sized_relobj_file
<size
, big_endian
>* object
)
5811 if (this->got_mod_index_offset_
== -1U)
5813 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5814 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5815 Output_data_got_aarch64
<size
, big_endian
>* got
=
5816 this->got_section(symtab
, layout
);
5817 unsigned int got_offset
= got
->add_constant(0);
5818 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5820 got
->add_constant(0);
5821 this->got_mod_index_offset_
= got_offset
;
5823 return this->got_mod_index_offset_
;
5826 // Optimize the TLS relocation type based on what we know about the
5827 // symbol. IS_FINAL is true if the final address of this symbol is
5828 // known at link time.
5830 template<int size
, bool big_endian
>
5831 tls::Tls_optimization
5832 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5835 // If we are generating a shared library, then we can't do anything
5837 if (parameters
->options().shared())
5838 return tls::TLSOPT_NONE
;
5842 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5843 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5844 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5845 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5846 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5847 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5848 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5849 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5850 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5851 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5852 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5853 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5854 // These are General-Dynamic which permits fully general TLS
5855 // access. Since we know that we are generating an executable,
5856 // we can convert this to Initial-Exec. If we also know that
5857 // this is a local symbol, we can further switch to Local-Exec.
5859 return tls::TLSOPT_TO_LE
;
5860 return tls::TLSOPT_TO_IE
;
5862 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5863 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5864 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5865 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5866 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5867 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5868 // These are Local-Dynamic, which refer to local symbols in the
5869 // dynamic TLS block. Since we know that we generating an
5870 // executable, we can switch to Local-Exec.
5871 return tls::TLSOPT_TO_LE
;
5873 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5874 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5875 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5876 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5877 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5878 // These are Initial-Exec relocs which get the thread offset
5879 // from the GOT. If we know that we are linking against the
5880 // local symbol, we can switch to Local-Exec, which links the
5881 // thread offset into the instruction.
5883 return tls::TLSOPT_TO_LE
;
5884 return tls::TLSOPT_NONE
;
5886 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5887 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5888 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5889 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5890 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5891 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5892 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5893 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5894 // When we already have Local-Exec, there is nothing further we
5896 return tls::TLSOPT_NONE
;
5903 // Returns true if this relocation type could be that of a function pointer.
5905 template<int size
, bool big_endian
>
5907 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5908 unsigned int r_type
)
5912 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5913 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5914 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5915 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5916 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5924 // For safe ICF, scan a relocation for a local symbol to check if it
5925 // corresponds to a function pointer being taken. In that case mark
5926 // the function whose pointer was taken as not foldable.
5928 template<int size
, bool big_endian
>
5930 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5933 Target_aarch64
<size
, big_endian
>* ,
5934 Sized_relobj_file
<size
, big_endian
>* ,
5937 const elfcpp::Rela
<size
, big_endian
>& ,
5938 unsigned int r_type
,
5939 const elfcpp::Sym
<size
, big_endian
>&)
5941 // When building a shared library, do not fold any local symbols.
5942 return (parameters
->options().shared()
5943 || possible_function_pointer_reloc(r_type
));
5946 // For safe ICF, scan a relocation for a global symbol to check if it
5947 // corresponds to a function pointer being taken. In that case mark
5948 // the function whose pointer was taken as not foldable.
5950 template<int size
, bool big_endian
>
5952 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5955 Target_aarch64
<size
, big_endian
>* ,
5956 Sized_relobj_file
<size
, big_endian
>* ,
5959 const elfcpp::Rela
<size
, big_endian
>& ,
5960 unsigned int r_type
,
5963 // When building a shared library, do not fold symbols whose visibility
5964 // is hidden, internal or protected.
5965 return ((parameters
->options().shared()
5966 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5967 || gsym
->visibility() == elfcpp::STV_PROTECTED
5968 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5969 || possible_function_pointer_reloc(r_type
));
5972 // Report an unsupported relocation against a local symbol.
5974 template<int size
, bool big_endian
>
5976 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
5977 Sized_relobj_file
<size
, big_endian
>* object
,
5978 unsigned int r_type
)
5980 gold_error(_("%s: unsupported reloc %u against local symbol"),
5981 object
->name().c_str(), r_type
);
5984 // We are about to emit a dynamic relocation of type R_TYPE. If the
5985 // dynamic linker does not support it, issue an error.
5987 template<int size
, bool big_endian
>
5989 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
5990 unsigned int r_type
)
5992 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
5996 // These are the relocation types supported by glibc for AARCH64.
5997 case elfcpp::R_AARCH64_NONE
:
5998 case elfcpp::R_AARCH64_COPY
:
5999 case elfcpp::R_AARCH64_GLOB_DAT
:
6000 case elfcpp::R_AARCH64_JUMP_SLOT
:
6001 case elfcpp::R_AARCH64_RELATIVE
:
6002 case elfcpp::R_AARCH64_TLS_DTPREL64
:
6003 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
6004 case elfcpp::R_AARCH64_TLS_TPREL64
:
6005 case elfcpp::R_AARCH64_TLSDESC
:
6006 case elfcpp::R_AARCH64_IRELATIVE
:
6007 case elfcpp::R_AARCH64_ABS32
:
6008 case elfcpp::R_AARCH64_ABS64
:
6015 // This prevents us from issuing more than one error per reloc
6016 // section. But we can still wind up issuing more than one
6017 // error per object file.
6018 if (this->issued_non_pic_error_
)
6020 gold_assert(parameters
->options().output_is_position_independent());
6021 object
->error(_("requires unsupported dynamic reloc; "
6022 "recompile with -fPIC"));
6023 this->issued_non_pic_error_
= true;
6027 // Return whether we need to make a PLT entry for a relocation of the
6028 // given type against a STT_GNU_IFUNC symbol.
6030 template<int size
, bool big_endian
>
6032 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
6033 Sized_relobj_file
<size
, big_endian
>* object
,
6034 unsigned int r_type
)
6036 const AArch64_reloc_property
* arp
=
6037 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6038 gold_assert(arp
!= NULL
);
6040 int flags
= arp
->reference_flags();
6041 if (flags
& Symbol::TLS_REF
)
6043 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
6044 object
->name().c_str(), arp
->name().c_str());
6050 // Scan a relocation for a local symbol.
6052 template<int size
, bool big_endian
>
6054 Target_aarch64
<size
, big_endian
>::Scan::local(
6055 Symbol_table
* symtab
,
6057 Target_aarch64
<size
, big_endian
>* target
,
6058 Sized_relobj_file
<size
, big_endian
>* object
,
6059 unsigned int data_shndx
,
6060 Output_section
* output_section
,
6061 const elfcpp::Rela
<size
, big_endian
>& rela
,
6062 unsigned int r_type
,
6063 const elfcpp::Sym
<size
, big_endian
>& lsym
,
6069 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6071 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6073 // A local STT_GNU_IFUNC symbol may require a PLT entry.
6074 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
6075 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
6076 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
6080 case elfcpp::R_AARCH64_NONE
:
6083 case elfcpp::R_AARCH64_ABS32
:
6084 case elfcpp::R_AARCH64_ABS16
:
6085 if (parameters
->options().output_is_position_independent())
6087 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6088 object
->name().c_str(), r_type
);
6092 case elfcpp::R_AARCH64_ABS64
:
6093 // If building a shared library or pie, we need to mark this as a dynmic
6094 // reloction, so that the dynamic loader can relocate it.
6095 if (parameters
->options().output_is_position_independent())
6097 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6098 rela_dyn
->add_local_relative(object
, r_sym
,
6099 elfcpp::R_AARCH64_RELATIVE
,
6102 rela
.get_r_offset(),
6103 rela
.get_r_addend(),
6108 case elfcpp::R_AARCH64_PREL64
:
6109 case elfcpp::R_AARCH64_PREL32
:
6110 case elfcpp::R_AARCH64_PREL16
:
6113 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6114 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6115 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6116 // The above relocations are used to access GOT entries.
6118 Output_data_got_aarch64
<size
, big_endian
>* got
=
6119 target
->got_section(symtab
, layout
);
6120 bool is_new
= false;
6121 // This symbol requires a GOT entry.
6123 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
6125 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
6126 if (is_new
&& parameters
->options().output_is_position_independent())
6127 target
->rela_dyn_section(layout
)->
6128 add_local_relative(object
,
6130 elfcpp::R_AARCH64_RELATIVE
,
6132 object
->local_got_offset(r_sym
,
6139 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6140 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6141 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6142 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6143 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6144 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6145 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6146 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6147 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6148 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6149 if (parameters
->options().output_is_position_independent())
6151 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6152 object
->name().c_str(), r_type
);
6156 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6157 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6158 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6159 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6160 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6161 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6162 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6163 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6164 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6165 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6168 // Control flow, pc-relative. We don't need to do anything for a relative
6169 // addressing relocation against a local symbol if it does not reference
6171 case elfcpp::R_AARCH64_TSTBR14
:
6172 case elfcpp::R_AARCH64_CONDBR19
:
6173 case elfcpp::R_AARCH64_JUMP26
:
6174 case elfcpp::R_AARCH64_CALL26
:
6177 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6178 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6180 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6181 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6182 if (tlsopt
== tls::TLSOPT_TO_LE
)
6185 layout
->set_has_static_tls();
6186 // Create a GOT entry for the tp-relative offset.
6187 if (!parameters
->doing_static_link())
6189 Output_data_got_aarch64
<size
, big_endian
>* got
=
6190 target
->got_section(symtab
, layout
);
6191 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
6192 target
->rela_dyn_section(layout
),
6193 elfcpp::R_AARCH64_TLS_TPREL64
);
6195 else if (!object
->local_has_got_offset(r_sym
,
6196 GOT_TYPE_TLS_OFFSET
))
6198 Output_data_got_aarch64
<size
, big_endian
>* got
=
6199 target
->got_section(symtab
, layout
);
6200 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
6201 unsigned int got_offset
=
6202 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
6203 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6204 gold_assert(addend
== 0);
6205 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
6211 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6212 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6214 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6215 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6216 if (tlsopt
== tls::TLSOPT_TO_LE
)
6218 layout
->set_has_static_tls();
6221 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6223 Output_data_got_aarch64
<size
, big_endian
>* got
=
6224 target
->got_section(symtab
, layout
);
6225 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
6227 target
->rela_dyn_section(layout
),
6228 elfcpp::R_AARCH64_TLS_DTPMOD64
);
6232 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6233 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6234 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6235 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6236 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6237 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6238 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6239 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6241 layout
->set_has_static_tls();
6242 bool output_is_shared
= parameters
->options().shared();
6243 if (output_is_shared
)
6244 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6245 object
->name().c_str(), r_type
);
6249 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6250 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6252 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6253 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6254 if (tlsopt
== tls::TLSOPT_NONE
)
6256 // Create a GOT entry for the module index.
6257 target
->got_mod_index_entry(symtab
, layout
, object
);
6259 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6260 unsupported_reloc_local(object
, r_type
);
6264 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6265 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6266 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6267 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6270 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6271 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6272 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6274 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6275 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6276 target
->define_tls_base_symbol(symtab
, layout
);
6277 if (tlsopt
== tls::TLSOPT_NONE
)
6279 // Create reserved PLT and GOT entries for the resolver.
6280 target
->reserve_tlsdesc_entries(symtab
, layout
);
6282 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6283 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6284 // entry needs to be in an area in .got.plt, not .got. Call
6285 // got_section to make sure the section has been created.
6286 target
->got_section(symtab
, layout
);
6287 Output_data_got
<size
, big_endian
>* got
=
6288 target
->got_tlsdesc_section();
6289 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6290 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
6292 unsigned int got_offset
= got
->add_constant(0);
6293 got
->add_constant(0);
6294 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
6296 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6297 // We store the arguments we need in a vector, and use
6298 // the index into the vector as the parameter to pass
6299 // to the target specific routines.
6300 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6301 void* arg
= reinterpret_cast<void*>(intarg
);
6302 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6303 got
, got_offset
, 0);
6306 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6307 unsupported_reloc_local(object
, r_type
);
6311 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6315 unsupported_reloc_local(object
, r_type
);
6320 // Report an unsupported relocation against a global symbol.
6322 template<int size
, bool big_endian
>
6324 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6325 Sized_relobj_file
<size
, big_endian
>* object
,
6326 unsigned int r_type
,
6329 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6330 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6333 template<int size
, bool big_endian
>
6335 Target_aarch64
<size
, big_endian
>::Scan::global(
6336 Symbol_table
* symtab
,
6338 Target_aarch64
<size
, big_endian
>* target
,
6339 Sized_relobj_file
<size
, big_endian
> * object
,
6340 unsigned int data_shndx
,
6341 Output_section
* output_section
,
6342 const elfcpp::Rela
<size
, big_endian
>& rela
,
6343 unsigned int r_type
,
6346 // A STT_GNU_IFUNC symbol may require a PLT entry.
6347 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6348 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6349 target
->make_plt_entry(symtab
, layout
, gsym
);
6351 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6353 const AArch64_reloc_property
* arp
=
6354 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6355 gold_assert(arp
!= NULL
);
6359 case elfcpp::R_AARCH64_NONE
:
6362 case elfcpp::R_AARCH64_ABS16
:
6363 case elfcpp::R_AARCH64_ABS32
:
6364 case elfcpp::R_AARCH64_ABS64
:
6366 // Make a PLT entry if necessary.
6367 if (gsym
->needs_plt_entry())
6369 target
->make_plt_entry(symtab
, layout
, gsym
);
6370 // Since this is not a PC-relative relocation, we may be
6371 // taking the address of a function. In that case we need to
6372 // set the entry in the dynamic symbol table to the address of
6374 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6375 gsym
->set_needs_dynsym_value();
6377 // Make a dynamic relocation if necessary.
6378 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6380 if (!parameters
->options().output_is_position_independent()
6381 && gsym
->may_need_copy_reloc())
6383 target
->copy_reloc(symtab
, layout
, object
,
6384 data_shndx
, output_section
, gsym
, rela
);
6386 else if (r_type
== elfcpp::R_AARCH64_ABS64
6387 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6388 && gsym
->can_use_relative_reloc(false)
6389 && !gsym
->is_from_dynobj()
6390 && !gsym
->is_undefined()
6391 && !gsym
->is_preemptible())
6393 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6394 // symbol. This makes a function address in a PIE executable
6395 // match the address in a shared library that it links against.
6396 Reloc_section
* rela_dyn
=
6397 target
->rela_irelative_section(layout
);
6398 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6399 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6400 output_section
, object
,
6402 rela
.get_r_offset(),
6403 rela
.get_r_addend());
6405 else if (r_type
== elfcpp::R_AARCH64_ABS64
6406 && gsym
->can_use_relative_reloc(false))
6408 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6409 rela_dyn
->add_global_relative(gsym
,
6410 elfcpp::R_AARCH64_RELATIVE
,
6414 rela
.get_r_offset(),
6415 rela
.get_r_addend(),
6420 check_non_pic(object
, r_type
);
6421 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6422 rela_dyn
= target
->rela_dyn_section(layout
);
6423 rela_dyn
->add_global(
6424 gsym
, r_type
, output_section
, object
,
6425 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6431 case elfcpp::R_AARCH64_PREL16
:
6432 case elfcpp::R_AARCH64_PREL32
:
6433 case elfcpp::R_AARCH64_PREL64
:
6434 // This is used to fill the GOT absolute address.
6435 if (gsym
->needs_plt_entry())
6437 target
->make_plt_entry(symtab
, layout
, gsym
);
6441 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6442 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6443 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6444 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6445 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6446 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6447 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6448 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6449 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6450 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6451 if (parameters
->options().output_is_position_independent())
6453 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6454 object
->name().c_str(), r_type
);
6458 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6459 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6460 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6461 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6462 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6463 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6464 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6465 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6466 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6467 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6469 if (gsym
->needs_plt_entry())
6470 target
->make_plt_entry(symtab
, layout
, gsym
);
6471 // Make a dynamic relocation if necessary.
6472 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6474 if (parameters
->options().output_is_executable()
6475 && gsym
->may_need_copy_reloc())
6477 target
->copy_reloc(symtab
, layout
, object
,
6478 data_shndx
, output_section
, gsym
, rela
);
6484 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6485 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6486 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6488 // The above relocations are used to access GOT entries.
6489 // Note a GOT entry is an *address* to a symbol.
6490 // The symbol requires a GOT entry
6491 Output_data_got_aarch64
<size
, big_endian
>* got
=
6492 target
->got_section(symtab
, layout
);
6493 if (gsym
->final_value_is_known())
6495 // For a STT_GNU_IFUNC symbol we want the PLT address.
6496 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6497 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6499 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6503 // If this symbol is not fully resolved, we need to add a dynamic
6504 // relocation for it.
6505 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6507 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6509 // 1) The symbol may be defined in some other module.
6510 // 2) We are building a shared library and this is a protected
6511 // symbol; using GLOB_DAT means that the dynamic linker can use
6512 // the address of the PLT in the main executable when appropriate
6513 // so that function address comparisons work.
6514 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6515 // again so that function address comparisons work.
6516 if (gsym
->is_from_dynobj()
6517 || gsym
->is_undefined()
6518 || gsym
->is_preemptible()
6519 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6520 && parameters
->options().shared())
6521 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6522 && parameters
->options().output_is_position_independent()))
6523 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6524 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6527 // For a STT_GNU_IFUNC symbol we want to write the PLT
6528 // offset into the GOT, so that function pointer
6529 // comparisons work correctly.
6531 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6532 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6535 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6536 // Tell the dynamic linker to use the PLT address
6537 // when resolving relocations.
6538 if (gsym
->is_from_dynobj()
6539 && !parameters
->options().shared())
6540 gsym
->set_needs_dynsym_value();
6544 rela_dyn
->add_global_relative(
6545 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6547 gsym
->got_offset(GOT_TYPE_STANDARD
),
6556 case elfcpp::R_AARCH64_TSTBR14
:
6557 case elfcpp::R_AARCH64_CONDBR19
:
6558 case elfcpp::R_AARCH64_JUMP26
:
6559 case elfcpp::R_AARCH64_CALL26
:
6561 if (gsym
->final_value_is_known())
6564 if (gsym
->is_defined() &&
6565 !gsym
->is_from_dynobj() &&
6566 !gsym
->is_preemptible())
6569 // Make plt entry for function call.
6570 target
->make_plt_entry(symtab
, layout
, gsym
);
6574 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6575 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6577 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6578 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6579 if (tlsopt
== tls::TLSOPT_TO_LE
)
6581 layout
->set_has_static_tls();
6584 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6587 Output_data_got_aarch64
<size
, big_endian
>* got
=
6588 target
->got_section(symtab
, layout
);
6589 // Create 2 consecutive entries for module index and offset.
6590 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6591 target
->rela_dyn_section(layout
),
6592 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6593 elfcpp::R_AARCH64_TLS_DTPREL64
);
6597 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6598 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6600 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6601 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6602 if (tlsopt
== tls::TLSOPT_NONE
)
6604 // Create a GOT entry for the module index.
6605 target
->got_mod_index_entry(symtab
, layout
, object
);
6607 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6608 unsupported_reloc_local(object
, r_type
);
6612 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6613 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6614 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6615 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6618 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6619 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6621 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6622 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6623 if (tlsopt
== tls::TLSOPT_TO_LE
)
6626 layout
->set_has_static_tls();
6627 // Create a GOT entry for the tp-relative offset.
6628 Output_data_got_aarch64
<size
, big_endian
>* got
6629 = target
->got_section(symtab
, layout
);
6630 if (!parameters
->doing_static_link())
6632 got
->add_global_with_rel(
6633 gsym
, GOT_TYPE_TLS_OFFSET
,
6634 target
->rela_dyn_section(layout
),
6635 elfcpp::R_AARCH64_TLS_TPREL64
);
6637 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6639 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6640 unsigned int got_offset
=
6641 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6642 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6643 gold_assert(addend
== 0);
6644 got
->add_static_reloc(got_offset
,
6645 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6650 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6651 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6652 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6653 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6654 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6655 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6656 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6657 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6658 layout
->set_has_static_tls();
6659 if (parameters
->options().shared())
6660 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6661 object
->name().c_str(), r_type
);
6664 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6665 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6666 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6668 target
->define_tls_base_symbol(symtab
, layout
);
6669 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6670 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6671 if (tlsopt
== tls::TLSOPT_NONE
)
6673 // Create reserved PLT and GOT entries for the resolver.
6674 target
->reserve_tlsdesc_entries(symtab
, layout
);
6676 // Create a double GOT entry with an R_AARCH64_TLSDESC
6677 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6678 // entry needs to be in an area in .got.plt, not .got. Call
6679 // got_section to make sure the section has been created.
6680 target
->got_section(symtab
, layout
);
6681 Output_data_got
<size
, big_endian
>* got
=
6682 target
->got_tlsdesc_section();
6683 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6684 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6685 elfcpp::R_AARCH64_TLSDESC
, 0);
6687 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6689 // Create a GOT entry for the tp-relative offset.
6690 Output_data_got
<size
, big_endian
>* got
6691 = target
->got_section(symtab
, layout
);
6692 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6693 target
->rela_dyn_section(layout
),
6694 elfcpp::R_AARCH64_TLS_TPREL64
);
6696 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6697 unsupported_reloc_global(object
, r_type
, gsym
);
6701 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6705 gold_error(_("%s: unsupported reloc type in global scan"),
6706 aarch64_reloc_property_table
->
6707 reloc_name_in_error_message(r_type
).c_str());
6710 } // End of Scan::global
6713 // Create the PLT section.
6714 template<int size
, bool big_endian
>
6716 Target_aarch64
<size
, big_endian
>::make_plt_section(
6717 Symbol_table
* symtab
, Layout
* layout
)
6719 if (this->plt_
== NULL
)
6721 // Create the GOT section first.
6722 this->got_section(symtab
, layout
);
6724 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6725 this->got_irelative_
);
6727 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6729 | elfcpp::SHF_EXECINSTR
),
6730 this->plt_
, ORDER_PLT
, false);
6732 // Make the sh_info field of .rela.plt point to .plt.
6733 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6734 rela_plt_os
->set_info_section(this->plt_
->output_section());
6738 // Return the section for TLSDESC relocations.
6740 template<int size
, bool big_endian
>
6741 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6742 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6744 return this->plt_section()->rela_tlsdesc(layout
);
6747 // Create a PLT entry for a global symbol.
6749 template<int size
, bool big_endian
>
6751 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6752 Symbol_table
* symtab
,
6756 if (gsym
->has_plt_offset())
6759 if (this->plt_
== NULL
)
6760 this->make_plt_section(symtab
, layout
);
6762 this->plt_
->add_entry(symtab
, layout
, gsym
);
6765 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6767 template<int size
, bool big_endian
>
6769 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6770 Symbol_table
* symtab
, Layout
* layout
,
6771 Sized_relobj_file
<size
, big_endian
>* relobj
,
6772 unsigned int local_sym_index
)
6774 if (relobj
->local_has_plt_offset(local_sym_index
))
6776 if (this->plt_
== NULL
)
6777 this->make_plt_section(symtab
, layout
);
6778 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6781 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6784 template<int size
, bool big_endian
>
6786 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6787 Symbol_table
* symtab
,
6789 Sized_relobj_file
<size
, big_endian
>* object
,
6790 unsigned int data_shndx
,
6791 unsigned int sh_type
,
6792 const unsigned char* prelocs
,
6794 Output_section
* output_section
,
6795 bool needs_special_offset_handling
,
6796 size_t local_symbol_count
,
6797 const unsigned char* plocal_symbols
)
6799 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6800 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6803 if (sh_type
== elfcpp::SHT_REL
)
6808 gold::gc_process_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6817 needs_special_offset_handling
,
6822 // Scan relocations for a section.
6824 template<int size
, bool big_endian
>
6826 Target_aarch64
<size
, big_endian
>::scan_relocs(
6827 Symbol_table
* symtab
,
6829 Sized_relobj_file
<size
, big_endian
>* object
,
6830 unsigned int data_shndx
,
6831 unsigned int sh_type
,
6832 const unsigned char* prelocs
,
6834 Output_section
* output_section
,
6835 bool needs_special_offset_handling
,
6836 size_t local_symbol_count
,
6837 const unsigned char* plocal_symbols
)
6839 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6840 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6843 if (sh_type
== elfcpp::SHT_REL
)
6845 gold_error(_("%s: unsupported REL reloc section"),
6846 object
->name().c_str());
6850 gold::scan_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6859 needs_special_offset_handling
,
6864 // Return the value to use for a dynamic which requires special
6865 // treatment. This is how we support equality comparisons of function
6866 // pointers across shared library boundaries, as described in the
6867 // processor specific ABI supplement.
6869 template<int size
, bool big_endian
>
6871 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6873 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6874 return this->plt_address_for_global(gsym
);
6878 // Finalize the sections.
6880 template<int size
, bool big_endian
>
6882 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6884 const Input_objects
*,
6885 Symbol_table
* symtab
)
6887 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6889 : this->plt_
->rela_plt());
6890 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6891 this->rela_dyn_
, true, false);
6893 // Emit any relocs we saved in an attempt to avoid generating COPY
6895 if (this->copy_relocs_
.any_saved_relocs())
6896 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6898 // Fill in some more dynamic tags.
6899 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6902 if (this->plt_
!= NULL
6903 && this->plt_
->output_section() != NULL
6904 && this->plt_
->has_tlsdesc_entry())
6906 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6907 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6908 this->got_
->finalize_data_size();
6909 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6910 this->plt_
, plt_offset
);
6911 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6912 this->got_
, got_offset
);
6916 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6917 // the .got.plt section.
6918 Symbol
* sym
= this->global_offset_table_
;
6921 uint64_t data_size
= this->got_plt_
->current_data_size();
6922 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6924 // If the .got section is more than 0x8000 bytes, we add
6925 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6926 // bit relocations have a greater chance of working.
6927 if (data_size
>= 0x8000)
6928 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6929 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6932 if (parameters
->doing_static_link()
6933 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6935 // If linking statically, make sure that the __rela_iplt symbols
6936 // were defined if necessary, even if we didn't create a PLT.
6937 static const Define_symbol_in_segment syms
[] =
6940 "__rela_iplt_start", // name
6941 elfcpp::PT_LOAD
, // segment_type
6942 elfcpp::PF_W
, // segment_flags_set
6943 elfcpp::PF(0), // segment_flags_clear
6946 elfcpp::STT_NOTYPE
, // type
6947 elfcpp::STB_GLOBAL
, // binding
6948 elfcpp::STV_HIDDEN
, // visibility
6950 Symbol::SEGMENT_START
, // offset_from_base
6954 "__rela_iplt_end", // name
6955 elfcpp::PT_LOAD
, // segment_type
6956 elfcpp::PF_W
, // segment_flags_set
6957 elfcpp::PF(0), // segment_flags_clear
6960 elfcpp::STT_NOTYPE
, // type
6961 elfcpp::STB_GLOBAL
, // binding
6962 elfcpp::STV_HIDDEN
, // visibility
6964 Symbol::SEGMENT_START
, // offset_from_base
6969 symtab
->define_symbols(layout
, 2, syms
,
6970 layout
->script_options()->saw_sections_clause());
6976 // Perform a relocation.
6978 template<int size
, bool big_endian
>
6980 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
6981 const Relocate_info
<size
, big_endian
>* relinfo
,
6983 Target_aarch64
<size
, big_endian
>* target
,
6986 const unsigned char* preloc
,
6987 const Sized_symbol
<size
>* gsym
,
6988 const Symbol_value
<size
>* psymval
,
6989 unsigned char* view
,
6990 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
6991 section_size_type
/* view_size */)
6996 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
6998 const elfcpp::Rela
<size
, big_endian
> rela(preloc
);
6999 unsigned int r_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
7000 const AArch64_reloc_property
* reloc_property
=
7001 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7003 if (reloc_property
== NULL
)
7005 std::string reloc_name
=
7006 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
7007 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7008 _("cannot relocate %s in object file"),
7009 reloc_name
.c_str());
7013 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7015 // Pick the value to use for symbols defined in the PLT.
7016 Symbol_value
<size
> symval
;
7018 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
7020 symval
.set_output_value(target
->plt_address_for_global(gsym
));
7023 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
7025 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7026 if (object
->local_has_plt_offset(r_sym
))
7028 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
7033 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7035 // Get the GOT offset if needed.
7036 // For aarch64, the GOT pointer points to the start of the GOT section.
7037 bool have_got_offset
= false;
7039 int got_base
= (target
->got_
!= NULL
7040 ? (target
->got_
->current_data_size() >= 0x8000
7045 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
7046 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
7047 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
7048 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
7049 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
7050 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
7051 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
7052 case elfcpp::R_AARCH64_GOTREL64
:
7053 case elfcpp::R_AARCH64_GOTREL32
:
7054 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
7055 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
7056 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7057 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7058 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7061 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
7062 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
7066 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7067 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
7068 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
7071 have_got_offset
= true;
7078 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
7079 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
7082 case elfcpp::R_AARCH64_NONE
:
7085 case elfcpp::R_AARCH64_ABS64
:
7086 if (!parameters
->options().apply_dynamic_relocs()
7087 && parameters
->options().output_is_position_independent()
7089 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags())
7090 && !gsym
->can_use_relative_reloc(false))
7091 // We have generated an absolute dynamic relocation, so do not
7092 // apply the relocation statically. (Works around bugs in older
7093 // Android dynamic linkers.)
7095 reloc_status
= Reloc::template rela_ua
<64>(
7096 view
, object
, psymval
, addend
, reloc_property
);
7099 case elfcpp::R_AARCH64_ABS32
:
7100 if (!parameters
->options().apply_dynamic_relocs()
7101 && parameters
->options().output_is_position_independent()
7103 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7104 // We have generated an absolute dynamic relocation, so do not
7105 // apply the relocation statically. (Works around bugs in older
7106 // Android dynamic linkers.)
7108 reloc_status
= Reloc::template rela_ua
<32>(
7109 view
, object
, psymval
, addend
, reloc_property
);
7112 case elfcpp::R_AARCH64_ABS16
:
7113 if (!parameters
->options().apply_dynamic_relocs()
7114 && parameters
->options().output_is_position_independent()
7116 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7117 // We have generated an absolute dynamic relocation, so do not
7118 // apply the relocation statically. (Works around bugs in older
7119 // Android dynamic linkers.)
7121 reloc_status
= Reloc::template rela_ua
<16>(
7122 view
, object
, psymval
, addend
, reloc_property
);
7125 case elfcpp::R_AARCH64_PREL64
:
7126 reloc_status
= Reloc::template pcrela_ua
<64>(
7127 view
, object
, psymval
, addend
, address
, reloc_property
);
7130 case elfcpp::R_AARCH64_PREL32
:
7131 reloc_status
= Reloc::template pcrela_ua
<32>(
7132 view
, object
, psymval
, addend
, address
, reloc_property
);
7135 case elfcpp::R_AARCH64_PREL16
:
7136 reloc_status
= Reloc::template pcrela_ua
<16>(
7137 view
, object
, psymval
, addend
, address
, reloc_property
);
7140 case elfcpp::R_AARCH64_MOVW_UABS_G0
:
7141 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
:
7142 case elfcpp::R_AARCH64_MOVW_UABS_G1
:
7143 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
:
7144 case elfcpp::R_AARCH64_MOVW_UABS_G2
:
7145 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
:
7146 case elfcpp::R_AARCH64_MOVW_UABS_G3
:
7147 reloc_status
= Reloc::template rela_general
<32>(
7148 view
, object
, psymval
, addend
, reloc_property
);
7150 case elfcpp::R_AARCH64_MOVW_SABS_G0
:
7151 case elfcpp::R_AARCH64_MOVW_SABS_G1
:
7152 case elfcpp::R_AARCH64_MOVW_SABS_G2
:
7153 reloc_status
= Reloc::movnz(view
, psymval
->value(object
, addend
),
7157 case elfcpp::R_AARCH64_LD_PREL_LO19
:
7158 reloc_status
= Reloc::template pcrela_general
<32>(
7159 view
, object
, psymval
, addend
, address
, reloc_property
);
7162 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
7163 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
7164 address
, reloc_property
);
7167 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
7168 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
7169 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
7173 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
7174 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
7175 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
7176 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
7177 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
7178 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
7179 reloc_status
= Reloc::template rela_general
<32>(
7180 view
, object
, psymval
, addend
, reloc_property
);
7183 case elfcpp::R_AARCH64_CALL26
:
7184 if (this->skip_call_tls_get_addr_
)
7186 // Double check that the TLSGD insn has been optimized away.
7187 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7188 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
7189 reinterpret_cast<Insntype
*>(view
));
7190 gold_assert((insn
& 0xff000000) == 0x91000000);
7192 reloc_status
= Reloc::STATUS_OKAY
;
7193 this->skip_call_tls_get_addr_
= false;
7194 // Return false to stop further processing this reloc.
7198 case elfcpp::R_AARCH64_JUMP26
:
7199 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
7200 gsym
, psymval
, object
,
7201 target
->stub_group_size_
))
7204 case elfcpp::R_AARCH64_TSTBR14
:
7205 case elfcpp::R_AARCH64_CONDBR19
:
7206 reloc_status
= Reloc::template pcrela_general
<32>(
7207 view
, object
, psymval
, addend
, address
, reloc_property
);
7210 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7211 gold_assert(have_got_offset
);
7212 value
= target
->got_
->address() + got_base
+ got_offset
;
7213 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
7216 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7217 gold_assert(have_got_offset
);
7218 value
= target
->got_
->address() + got_base
+ got_offset
;
7219 reloc_status
= Reloc::template rela_general
<32>(
7220 view
, value
, addend
, reloc_property
);
7223 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7225 gold_assert(have_got_offset
);
7226 value
= target
->got_
->address() + got_base
+ got_offset
+ addend
-
7227 Reloc::Page(target
->got_
->address() + got_base
);
7228 if ((value
& 7) != 0)
7229 reloc_status
= Reloc::STATUS_OVERFLOW
;
7231 reloc_status
= Reloc::template reloc_common
<32>(
7232 view
, value
, reloc_property
);
7236 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7237 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7238 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7239 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7240 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7241 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7242 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7243 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7244 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7245 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7246 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7247 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7248 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7249 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7250 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7251 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7252 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7253 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7254 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7255 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7256 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7257 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7258 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
7259 gsym
, psymval
, view
, address
);
7262 // These are dynamic relocations, which are unexpected when linking.
7263 case elfcpp::R_AARCH64_COPY
:
7264 case elfcpp::R_AARCH64_GLOB_DAT
:
7265 case elfcpp::R_AARCH64_JUMP_SLOT
:
7266 case elfcpp::R_AARCH64_RELATIVE
:
7267 case elfcpp::R_AARCH64_IRELATIVE
:
7268 case elfcpp::R_AARCH64_TLS_DTPREL64
:
7269 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
7270 case elfcpp::R_AARCH64_TLS_TPREL64
:
7271 case elfcpp::R_AARCH64_TLSDESC
:
7272 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7273 _("unexpected reloc %u in object file"),
7278 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7279 _("unsupported reloc %s"),
7280 reloc_property
->name().c_str());
7284 // Report any errors.
7285 switch (reloc_status
)
7287 case Reloc::STATUS_OKAY
:
7289 case Reloc::STATUS_OVERFLOW
:
7290 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7291 _("relocation overflow in %s"),
7292 reloc_property
->name().c_str());
7294 case Reloc::STATUS_BAD_RELOC
:
7295 gold_error_at_location(
7298 rela
.get_r_offset(),
7299 _("unexpected opcode while processing relocation %s"),
7300 reloc_property
->name().c_str());
7310 template<int size
, bool big_endian
>
7312 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7313 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
7314 const Relocate_info
<size
, big_endian
>* relinfo
,
7315 Target_aarch64
<size
, big_endian
>* target
,
7317 const elfcpp::Rela
<size
, big_endian
>& rela
,
7318 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
7319 const Symbol_value
<size
>* psymval
,
7320 unsigned char* view
,
7321 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7323 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7324 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7326 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7327 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7328 const AArch64_reloc_property
* reloc_property
=
7329 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7330 gold_assert(reloc_property
!= NULL
);
7332 const bool is_final
= (gsym
== NULL
7333 ? !parameters
->options().shared()
7334 : gsym
->final_value_is_known());
7335 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
7336 optimize_tls_reloc(is_final
, r_type
);
7338 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7339 int tls_got_offset_type
;
7342 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7343 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
7345 if (tlsopt
== tls::TLSOPT_TO_LE
)
7347 if (tls_segment
== NULL
)
7349 gold_assert(parameters
->errors()->error_count() > 0
7350 || issue_undefined_symbol_error(gsym
));
7351 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7353 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
7356 else if (tlsopt
== tls::TLSOPT_NONE
)
7358 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
7359 // Firstly get the address for the got entry.
7360 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7363 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7364 got_entry_address
= target
->got_
->address() +
7365 gsym
->got_offset(tls_got_offset_type
);
7369 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7371 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7372 got_entry_address
= target
->got_
->address() +
7373 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7376 // Relocate the address into adrp/ld, adrp/add pair.
7379 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7380 return aarch64_reloc_funcs::adrp(
7381 view
, got_entry_address
+ addend
, address
);
7385 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7386 return aarch64_reloc_funcs::template rela_general
<32>(
7387 view
, got_entry_address
, addend
, reloc_property
);
7394 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7395 _("unsupported gd_to_ie relaxation on %u"),
7400 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7401 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7403 if (tlsopt
== tls::TLSOPT_TO_LE
)
7405 if (tls_segment
== NULL
)
7407 gold_assert(parameters
->errors()->error_count() > 0
7408 || issue_undefined_symbol_error(gsym
));
7409 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7411 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7415 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7416 // Relocate the field with the offset of the GOT entry for
7417 // the module index.
7418 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7419 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7420 target
->got_
->address());
7424 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7425 return aarch64_reloc_funcs::adrp(
7426 view
, got_entry_address
+ addend
, address
);
7429 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7430 return aarch64_reloc_funcs::template rela_general
<32>(
7431 view
, got_entry_address
, addend
, reloc_property
);
7440 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7441 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7442 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7443 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7445 AArch64_address value
= psymval
->value(object
, 0);
7446 if (tlsopt
== tls::TLSOPT_TO_LE
)
7448 if (tls_segment
== NULL
)
7450 gold_assert(parameters
->errors()->error_count() > 0
7451 || issue_undefined_symbol_error(gsym
));
7452 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7457 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7458 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7462 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7463 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7464 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7465 return aarch64_reloc_funcs::template rela_general
<32>(
7466 view
, value
, addend
, reloc_property
);
7472 // We should never reach here.
7476 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7477 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7479 if (tlsopt
== tls::TLSOPT_TO_LE
)
7481 if (tls_segment
== NULL
)
7483 gold_assert(parameters
->errors()->error_count() > 0
7484 || issue_undefined_symbol_error(gsym
));
7485 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7487 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7490 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7492 // Firstly get the address for the got entry.
7493 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7496 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7497 got_entry_address
= target
->got_
->address() +
7498 gsym
->got_offset(tls_got_offset_type
);
7502 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7504 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7505 got_entry_address
= target
->got_
->address() +
7506 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7508 // Relocate the address into adrp/ld, adrp/add pair.
7511 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7512 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7515 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7516 return aarch64_reloc_funcs::template rela_general
<32>(
7517 view
, got_entry_address
, addend
, reloc_property
);
7522 // We shall never reach here.
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_G1_NC
:
7528 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7529 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7530 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7531 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7532 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7534 gold_assert(tls_segment
!= NULL
);
7535 AArch64_address value
= psymval
->value(object
, 0);
7537 if (!parameters
->options().shared())
7539 AArch64_address aligned_tcb_size
=
7540 align_address(target
->tcb_size(),
7541 tls_segment
->maximum_alignment());
7542 value
+= aligned_tcb_size
;
7545 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7546 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7547 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7548 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7551 return aarch64_reloc_funcs::template
7552 rela_general
<32>(view
,
7559 gold_error(_("%s: unsupported reloc %u "
7560 "in non-static TLSLE mode."),
7561 object
->name().c_str(), r_type
);
7565 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7566 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7567 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7568 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7570 if (tlsopt
== tls::TLSOPT_TO_LE
)
7572 if (tls_segment
== NULL
)
7574 gold_assert(parameters
->errors()->error_count() > 0
7575 || issue_undefined_symbol_error(gsym
));
7576 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7578 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7583 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7584 ? GOT_TYPE_TLS_OFFSET
7585 : GOT_TYPE_TLS_DESC
);
7586 int got_tlsdesc_offset
= 0;
7587 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7588 && tlsopt
== tls::TLSOPT_NONE
)
7590 // We created GOT entries in the .got.tlsdesc portion of the
7591 // .got.plt section, but the offset stored in the symbol is the
7592 // offset within .got.tlsdesc.
7593 got_tlsdesc_offset
= (target
->got_tlsdesc_
->address()
7594 - target
->got_
->address());
7596 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7599 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7600 got_entry_address
= target
->got_
->address()
7601 + got_tlsdesc_offset
7602 + gsym
->got_offset(tls_got_offset_type
);
7606 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7608 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7609 got_entry_address
= target
->got_
->address() +
7610 got_tlsdesc_offset
+
7611 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7613 if (tlsopt
== tls::TLSOPT_TO_IE
)
7615 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7616 view
, psymval
, got_entry_address
,
7620 // Now do tlsdesc relocation.
7623 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7624 return aarch64_reloc_funcs::adrp(view
,
7625 got_entry_address
+ addend
,
7628 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7629 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7630 return aarch64_reloc_funcs::template rela_general
<32>(
7631 view
, got_entry_address
, addend
, reloc_property
);
7633 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7634 return aarch64_reloc_funcs::STATUS_OKAY
;
7644 gold_error(_("%s: unsupported TLS reloc %u."),
7645 object
->name().c_str(), r_type
);
7647 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7648 } // End of relocate_tls.
7651 template<int size
, bool big_endian
>
7653 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7654 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7655 const Relocate_info
<size
, big_endian
>* relinfo
,
7656 Target_aarch64
<size
, big_endian
>* target
,
7657 const elfcpp::Rela
<size
, big_endian
>& rela
,
7658 unsigned int r_type
,
7659 unsigned char* view
,
7660 const Symbol_value
<size
>* psymval
)
7662 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7663 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7664 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7666 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7667 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7668 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7669 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7671 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7673 // This is the 2nd relocs, optimization should already have been
7675 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7676 return aarch64_reloc_funcs::STATUS_OKAY
;
7679 // The original sequence is -
7680 // 90000000 adrp x0, 0 <main>
7681 // 91000000 add x0, x0, #0x0
7682 // 94000000 bl 0 <__tls_get_addr>
7683 // optimized to sequence -
7684 // d53bd040 mrs x0, tpidr_el0
7685 // 91400000 add x0, x0, #0x0, lsl #12
7686 // 91000000 add x0, x0, #0x0
7688 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7689 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7690 // have to change "bl tls_get_addr", which does not have a corresponding tls
7691 // relocation type. So before proceeding, we need to make sure compiler
7692 // does not change the sequence.
7693 if(!(insn1
== 0x90000000 // adrp x0,0
7694 && insn2
== 0x91000000 // add x0, x0, #0x0
7695 && insn3
== 0x94000000)) // bl 0
7697 // Ideally we should give up gd_to_le relaxation and do gd access.
7698 // However the gd_to_le relaxation decision has been made early
7699 // in the scan stage, where we did not allocate any GOT entry for
7700 // this symbol. Therefore we have to exit and report error now.
7701 gold_error(_("unexpected reloc insn sequence while relaxing "
7702 "tls gd to le for reloc %u."), r_type
);
7703 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7707 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7708 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7709 insn3
= 0x91000000; // add x0, x0, #0x0
7710 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7711 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7712 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7714 // Calculate tprel value.
7715 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7716 gold_assert(tls_segment
!= NULL
);
7717 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7718 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7719 AArch64_address aligned_tcb_size
=
7720 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7721 AArch64_address x
= value
+ aligned_tcb_size
;
7723 // After new insns are written, apply TLSLE relocs.
7724 const AArch64_reloc_property
* rp1
=
7725 aarch64_reloc_property_table
->get_reloc_property(
7726 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7727 const AArch64_reloc_property
* rp2
=
7728 aarch64_reloc_property_table
->get_reloc_property(
7729 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7730 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7732 typename
aarch64_reloc_funcs::Status s1
=
7733 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7737 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7740 typename
aarch64_reloc_funcs::Status s2
=
7741 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7746 this->skip_call_tls_get_addr_
= true;
7748 } // End of tls_gd_to_le
7751 template<int size
, bool big_endian
>
7753 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7754 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7755 const Relocate_info
<size
, big_endian
>* relinfo
,
7756 Target_aarch64
<size
, big_endian
>* target
,
7757 const elfcpp::Rela
<size
, big_endian
>& rela
,
7758 unsigned int r_type
,
7759 unsigned char* view
,
7760 const Symbol_value
<size
>* psymval
)
7762 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7763 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7764 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7766 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7767 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7768 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7769 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7771 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7773 // This is the 2nd relocs, optimization should already have been
7775 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7776 return aarch64_reloc_funcs::STATUS_OKAY
;
7779 // The original sequence is -
7780 // 90000000 adrp x0, 0 <main>
7781 // 91000000 add x0, x0, #0x0
7782 // 94000000 bl 0 <__tls_get_addr>
7783 // optimized to sequence -
7784 // d53bd040 mrs x0, tpidr_el0
7785 // 91400000 add x0, x0, #0x0, lsl #12
7786 // 91000000 add x0, x0, #0x0
7788 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7789 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7790 // have to change "bl tls_get_addr", which does not have a corresponding tls
7791 // relocation type. So before proceeding, we need to make sure compiler
7792 // does not change the sequence.
7793 if(!(insn1
== 0x90000000 // adrp x0,0
7794 && insn2
== 0x91000000 // add x0, x0, #0x0
7795 && insn3
== 0x94000000)) // bl 0
7797 // Ideally we should give up gd_to_le relaxation and do gd access.
7798 // However the gd_to_le relaxation decision has been made early
7799 // in the scan stage, where we did not allocate a GOT entry for
7800 // this symbol. Therefore we have to exit and report an error now.
7801 gold_error(_("unexpected reloc insn sequence while relaxing "
7802 "tls gd to le for reloc %u."), r_type
);
7803 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7807 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7808 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7809 insn3
= 0x91000000; // add x0, x0, #0x0
7810 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7811 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7812 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7814 // Calculate tprel value.
7815 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7816 gold_assert(tls_segment
!= NULL
);
7817 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7818 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7819 AArch64_address aligned_tcb_size
=
7820 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7821 AArch64_address x
= value
+ aligned_tcb_size
;
7823 // After new insns are written, apply TLSLE relocs.
7824 const AArch64_reloc_property
* rp1
=
7825 aarch64_reloc_property_table
->get_reloc_property(
7826 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7827 const AArch64_reloc_property
* rp2
=
7828 aarch64_reloc_property_table
->get_reloc_property(
7829 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7830 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7832 typename
aarch64_reloc_funcs::Status s1
=
7833 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7837 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7840 typename
aarch64_reloc_funcs::Status s2
=
7841 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7846 this->skip_call_tls_get_addr_
= true;
7849 } // End of tls_ld_to_le
7851 template<int size
, bool big_endian
>
7853 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7854 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7855 const Relocate_info
<size
, big_endian
>* relinfo
,
7856 Target_aarch64
<size
, big_endian
>* target
,
7857 const elfcpp::Rela
<size
, big_endian
>& rela
,
7858 unsigned int r_type
,
7859 unsigned char* view
,
7860 const Symbol_value
<size
>* psymval
)
7862 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7863 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7864 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7866 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7867 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7868 AArch64_address aligned_tcb_address
=
7869 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7870 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7871 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7872 // "x" is the offset to tp, we can only do this if x is within
7873 // range [0, 2^32-1]
7874 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7876 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7878 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7881 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7882 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7885 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7888 regno
= (insn
& 0x1f);
7889 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7891 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7894 regno
= (insn
& 0x1f);
7895 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7896 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7901 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7902 return aarch64_reloc_funcs::STATUS_OKAY
;
7903 } // End of tls_ie_to_le
7906 template<int size
, bool big_endian
>
7908 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7909 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7910 const Relocate_info
<size
, big_endian
>* relinfo
,
7911 Target_aarch64
<size
, big_endian
>* target
,
7912 const elfcpp::Rela
<size
, big_endian
>& rela
,
7913 unsigned int r_type
,
7914 unsigned char* view
,
7915 const Symbol_value
<size
>* psymval
)
7917 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7918 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7919 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7921 // TLSDESC-GD sequence is like:
7922 // adrp x0, :tlsdesc:v1
7923 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7924 // add x0, x0, :tlsdesc_lo12:v1
7927 // After desc_gd_to_le optimization, the sequence will be like:
7928 // movz x0, #0x0, lsl #16
7933 // Calculate tprel value.
7934 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7935 gold_assert(tls_segment
!= NULL
);
7936 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7937 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7938 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7939 AArch64_address aligned_tcb_size
=
7940 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7941 AArch64_address x
= value
+ aligned_tcb_size
;
7942 // x is the offset to tp, we can only do this if x is within range
7943 // [0, 2^32-1]. If x is out of range, fail and exit.
7944 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7946 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7947 "We Can't do gd_to_le relaxation.\n"), r_type
);
7948 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7953 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7954 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7956 newinsn
= 0xd503201f;
7959 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7961 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7964 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7966 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7970 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7974 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7975 return aarch64_reloc_funcs::STATUS_OKAY
;
7976 } // End of tls_desc_gd_to_le
7979 template<int size
, bool big_endian
>
7981 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7982 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
7983 const Relocate_info
<size
, big_endian
>* /* relinfo */,
7984 Target_aarch64
<size
, big_endian
>* /* target */,
7985 const elfcpp::Rela
<size
, big_endian
>& rela
,
7986 unsigned int r_type
,
7987 unsigned char* view
,
7988 const Symbol_value
<size
>* /* psymval */,
7989 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
7990 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7992 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7993 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7995 // TLSDESC-GD sequence is like:
7996 // adrp x0, :tlsdesc:v1
7997 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7998 // add x0, x0, :tlsdesc_lo12:v1
8001 // After desc_gd_to_ie optimization, the sequence will be like:
8002 // adrp x0, :tlsie:v1
8003 // ldr x0, [x0, :tlsie_lo12:v1]
8007 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
8008 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
8012 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
8013 case elfcpp::R_AARCH64_TLSDESC_CALL
:
8015 newinsn
= 0xd503201f;
8016 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
8019 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
8021 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
8026 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
8028 // Set ldr target register to be x0.
8029 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
8031 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
8033 const AArch64_reloc_property
* reloc_property
=
8034 aarch64_reloc_property_table
->get_reloc_property(
8035 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
8036 return aarch64_reloc_funcs::template rela_general
<32>(
8037 view
, got_entry_address
, addend
, reloc_property
);
8042 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
8046 return aarch64_reloc_funcs::STATUS_OKAY
;
8047 } // End of tls_desc_gd_to_ie
8049 // Relocate section data.
8051 template<int size
, bool big_endian
>
8053 Target_aarch64
<size
, big_endian
>::relocate_section(
8054 const Relocate_info
<size
, big_endian
>* relinfo
,
8055 unsigned int sh_type
,
8056 const unsigned char* prelocs
,
8058 Output_section
* output_section
,
8059 bool needs_special_offset_handling
,
8060 unsigned char* view
,
8061 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
8062 section_size_type view_size
,
8063 const Reloc_symbol_changes
* reloc_symbol_changes
)
8065 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
8066 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
8067 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
8068 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8071 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8073 // See if we are relocating a relaxed input section. If so, the view
8074 // covers the whole output section and we need to adjust accordingly.
8075 if (needs_special_offset_handling
)
8077 const Output_relaxed_input_section
* poris
=
8078 output_section
->find_relaxed_input_section(relinfo
->object
,
8079 relinfo
->data_shndx
);
8082 Address section_address
= poris
->address();
8083 section_size_type section_size
= poris
->data_size();
8085 gold_assert((section_address
>= address
)
8086 && ((section_address
+ section_size
)
8087 <= (address
+ view_size
)));
8089 off_t offset
= section_address
- address
;
8092 view_size
= section_size
;
8096 gold::relocate_section
<size
, big_endian
, Aarch64
, AArch64_relocate
,
8097 gold::Default_comdat_behavior
, Classify_reloc
>(
8103 needs_special_offset_handling
,
8107 reloc_symbol_changes
);
8110 // Scan the relocs during a relocatable link.
8112 template<int size
, bool big_endian
>
8114 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
8115 Symbol_table
* symtab
,
8117 Sized_relobj_file
<size
, big_endian
>* object
,
8118 unsigned int data_shndx
,
8119 unsigned int sh_type
,
8120 const unsigned char* prelocs
,
8122 Output_section
* output_section
,
8123 bool needs_special_offset_handling
,
8124 size_t local_symbol_count
,
8125 const unsigned char* plocal_symbols
,
8126 Relocatable_relocs
* rr
)
8128 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8130 typedef gold::Default_scan_relocatable_relocs
<Classify_reloc
>
8131 Scan_relocatable_relocs
;
8133 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8135 gold::scan_relocatable_relocs
<size
, big_endian
, Scan_relocatable_relocs
>(
8143 needs_special_offset_handling
,
8149 // Scan the relocs for --emit-relocs.
8151 template<int size
, bool big_endian
>
8153 Target_aarch64
<size
, big_endian
>::emit_relocs_scan(
8154 Symbol_table
* symtab
,
8156 Sized_relobj_file
<size
, big_endian
>* object
,
8157 unsigned int data_shndx
,
8158 unsigned int sh_type
,
8159 const unsigned char* prelocs
,
8161 Output_section
* output_section
,
8162 bool needs_special_offset_handling
,
8163 size_t local_symbol_count
,
8164 const unsigned char* plocal_syms
,
8165 Relocatable_relocs
* rr
)
8167 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8169 typedef gold::Default_emit_relocs_strategy
<Classify_reloc
>
8170 Emit_relocs_strategy
;
8172 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8174 gold::scan_relocatable_relocs
<size
, big_endian
, Emit_relocs_strategy
>(
8182 needs_special_offset_handling
,
8188 // Relocate a section during a relocatable link.
8190 template<int size
, bool big_endian
>
8192 Target_aarch64
<size
, big_endian
>::relocate_relocs(
8193 const Relocate_info
<size
, big_endian
>* relinfo
,
8194 unsigned int sh_type
,
8195 const unsigned char* prelocs
,
8197 Output_section
* output_section
,
8198 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
8199 unsigned char* view
,
8200 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
8201 section_size_type view_size
,
8202 unsigned char* reloc_view
,
8203 section_size_type reloc_view_size
)
8205 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8208 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8210 gold::relocate_relocs
<size
, big_endian
, Classify_reloc
>(
8215 offset_in_output_section
,
8224 // Return whether this is a 3-insn erratum sequence.
8226 template<int size
, bool big_endian
>
8228 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
8229 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8230 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
8231 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
8236 // The 2nd insn is a single register load or store; or register pair
8238 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
8239 && (!pair
|| (pair
&& !load
)))
8241 // The 3rd insn is a load or store instruction from the "Load/store
8242 // register (unsigned immediate)" encoding class, using Rn as the
8243 // base address register.
8244 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
8245 && (Insn_utilities::aarch64_rn(insn3
)
8246 == Insn_utilities::aarch64_rd(insn1
)))
8253 // Return whether this is a 835769 sequence.
8254 // (Similarly implemented as in elfnn-aarch64.c.)
8256 template<int size
, bool big_endian
>
8258 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
8259 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8260 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
8270 if (Insn_utilities::aarch64_mlxl(insn2
)
8271 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
8273 /* Any SIMD memory op is independent of the subsequent MLA
8274 by definition of the erratum. */
8275 if (Insn_utilities::aarch64_bit(insn1
, 26))
8278 /* If not SIMD, check for integer memory ops and MLA relationship. */
8279 rn
= Insn_utilities::aarch64_rn(insn2
);
8280 ra
= Insn_utilities::aarch64_ra(insn2
);
8281 rm
= Insn_utilities::aarch64_rm(insn2
);
8283 /* If this is a load and there's a true(RAW) dependency, we are safe
8284 and this is not an erratum sequence. */
8286 (rt
== rn
|| rt
== rm
|| rt
== ra
8287 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
8290 /* We conservatively put out stubs for all other cases (including
8299 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8301 template<int size
, bool big_endian
>
8303 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
8304 AArch64_relobj
<size
, big_endian
>* relobj
,
8306 section_size_type erratum_insn_offset
,
8307 Address erratum_address
,
8308 typename
Insn_utilities::Insntype erratum_insn
,
8310 unsigned int e843419_adrp_offset
)
8312 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
8313 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
8314 gold_assert(stub_table
!= NULL
);
8315 if (stub_table
->find_erratum_stub(relobj
,
8317 erratum_insn_offset
) == NULL
)
8319 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8320 The_erratum_stub
* stub
;
8321 if (erratum_type
== ST_E_835769
)
8322 stub
= new The_erratum_stub(relobj
, erratum_type
, shndx
,
8323 erratum_insn_offset
);
8324 else if (erratum_type
== ST_E_843419
)
8325 stub
= new E843419_stub
<size
, big_endian
>(
8326 relobj
, shndx
, erratum_insn_offset
, e843419_adrp_offset
);
8329 stub
->set_erratum_insn(erratum_insn
);
8330 stub
->set_erratum_address(erratum_address
);
8331 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8332 // always the next insn after erratum insn.
8333 stub
->set_destination_address(erratum_address
+ BPI
);
8334 stub_table
->add_erratum_stub(stub
);
8339 // Scan erratum for section SHNDX range [output_address + span_start,
8340 // output_address + span_end). Note here we do not share the code with
8341 // scan_erratum_843419_span function, because for 843419 we optimize by only
8342 // scanning the last few insns of a page, whereas for 835769, we need to scan
8345 template<int size
, bool big_endian
>
8347 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
8348 AArch64_relobj
<size
, big_endian
>* relobj
,
8350 const section_size_type span_start
,
8351 const section_size_type span_end
,
8352 unsigned char* input_view
,
8353 Address output_address
)
8355 typedef typename
Insn_utilities::Insntype Insntype
;
8357 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8359 // Adjust output_address and view to the start of span.
8360 output_address
+= span_start
;
8361 input_view
+= span_start
;
8363 section_size_type span_length
= span_end
- span_start
;
8364 section_size_type offset
= 0;
8365 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
8367 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8368 Insntype insn1
= ip
[0];
8369 Insntype insn2
= ip
[1];
8370 if (is_erratum_835769_sequence(insn1
, insn2
))
8372 Insntype erratum_insn
= insn2
;
8373 // "span_start + offset" is the offset for insn1. So for insn2, it is
8374 // "span_start + offset + BPI".
8375 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
8376 Address erratum_address
= output_address
+ offset
+ BPI
;
8377 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8378 "section %d, offset 0x%08x."),
8379 relobj
->name().c_str(), shndx
,
8380 (unsigned int)(span_start
+ offset
));
8382 this->create_erratum_stub(relobj
, shndx
,
8383 erratum_insn_offset
, erratum_address
,
8384 erratum_insn
, ST_E_835769
);
8385 offset
+= BPI
; // Skip mac insn.
8388 } // End of "Target_aarch64::scan_erratum_835769_span".
8391 // Scan erratum for section SHNDX range
8392 // [output_address + span_start, output_address + span_end).
8394 template<int size
, bool big_endian
>
8396 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
8397 AArch64_relobj
<size
, big_endian
>* relobj
,
8399 const section_size_type span_start
,
8400 const section_size_type span_end
,
8401 unsigned char* input_view
,
8402 Address output_address
)
8404 typedef typename
Insn_utilities::Insntype Insntype
;
8406 // Adjust output_address and view to the start of span.
8407 output_address
+= span_start
;
8408 input_view
+= span_start
;
8410 if ((output_address
& 0x03) != 0)
8413 section_size_type offset
= 0;
8414 section_size_type span_length
= span_end
- span_start
;
8415 // The first instruction must be ending at 0xFF8 or 0xFFC.
8416 unsigned int page_offset
= output_address
& 0xFFF;
8417 // Make sure starting position, that is "output_address+offset",
8418 // starts at page position 0xff8 or 0xffc.
8419 if (page_offset
< 0xff8)
8420 offset
= 0xff8 - page_offset
;
8421 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8423 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8424 Insntype insn1
= ip
[0];
8425 if (Insn_utilities::is_adrp(insn1
))
8427 Insntype insn2
= ip
[1];
8428 Insntype insn3
= ip
[2];
8429 Insntype erratum_insn
;
8430 unsigned insn_offset
;
8431 bool do_report
= false;
8432 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
8435 erratum_insn
= insn3
;
8436 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
8438 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8440 // Optionally we can have an insn between ins2 and ins3
8441 Insntype insn_opt
= ip
[2];
8442 // And insn_opt must not be a branch.
8443 if (!Insn_utilities::aarch64_b(insn_opt
)
8444 && !Insn_utilities::aarch64_bl(insn_opt
)
8445 && !Insn_utilities::aarch64_blr(insn_opt
)
8446 && !Insn_utilities::aarch64_br(insn_opt
))
8448 // And insn_opt must not write to dest reg in insn1. However
8449 // we do a conservative scan, which means we may fix/report
8450 // more than necessary, but it doesn't hurt.
8452 Insntype insn4
= ip
[3];
8453 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8456 erratum_insn
= insn4
;
8457 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8463 unsigned int erratum_insn_offset
=
8464 span_start
+ offset
+ insn_offset
;
8465 Address erratum_address
=
8466 output_address
+ offset
+ insn_offset
;
8467 create_erratum_stub(relobj
, shndx
,
8468 erratum_insn_offset
, erratum_address
,
8469 erratum_insn
, ST_E_843419
,
8470 span_start
+ offset
);
8474 // Advance to next candidate instruction. We only consider instruction
8475 // sequences starting at a page offset of 0xff8 or 0xffc.
8476 page_offset
= (output_address
+ offset
) & 0xfff;
8477 if (page_offset
== 0xff8)
8479 else // (page_offset == 0xffc), we move to next page's 0xff8.
8482 } // End of "Target_aarch64::scan_erratum_843419_span".
8485 // The selector for aarch64 object files.
8487 template<int size
, bool big_endian
>
8488 class Target_selector_aarch64
: public Target_selector
8491 Target_selector_aarch64();
8494 do_instantiate_target()
8495 { return new Target_aarch64
<size
, big_endian
>(); }
8499 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8500 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8501 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8505 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8506 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8507 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8511 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8512 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8513 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8517 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8518 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8519 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8522 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8523 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8524 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8525 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8527 } // End anonymous namespace.