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 aarch64_rm(const Insntype insn
)
115 { return aarch64_bits(insn
, 16, 5); }
118 aarch64_rn(const Insntype insn
)
119 { return aarch64_bits(insn
, 5, 5); }
122 aarch64_rd(const Insntype insn
)
123 { return aarch64_bits(insn
, 0, 5); }
126 aarch64_rt(const Insntype insn
)
127 { return aarch64_bits(insn
, 0, 5); }
130 aarch64_rt2(const Insntype insn
)
131 { return aarch64_bits(insn
, 10, 5); }
133 // Encode imm21 into adr. Signed imm21 is in the range of [-1M, 1M).
135 aarch64_adr_encode_imm(Insntype adr
, int imm21
)
137 gold_assert(is_adr(adr
));
138 gold_assert(-(1 << 20) <= imm21
&& imm21
< (1 << 20));
139 const int mask19
= (1 << 19) - 1;
141 adr
&= ~((mask19
<< 5) | (mask2
<< 29));
142 adr
|= ((imm21
& mask2
) << 29) | (((imm21
>> 2) & mask19
) << 5);
146 // Retrieve encoded adrp 33-bit signed imm value. This value is obtained by
147 // 21-bit signed imm encoded in the insn multiplied by 4k (page size) and
148 // 64-bit sign-extended, resulting in [-4G, 4G) with 12-lsb being 0.
150 aarch64_adrp_decode_imm(const Insntype adrp
)
152 const int mask19
= (1 << 19) - 1;
154 gold_assert(is_adrp(adrp
));
155 // 21-bit imm encoded in adrp.
156 uint64_t imm
= ((adrp
>> 29) & mask2
) | (((adrp
>> 5) & mask19
) << 2);
157 // Retrieve msb of 21-bit-signed imm for sign extension.
158 uint64_t msbt
= (imm
>> 20) & 1;
159 // Real value is imm multiplied by 4k. Value now has 33-bit information.
160 int64_t value
= imm
<< 12;
161 // Sign extend to 64-bit by repeating msbt 31 (64-33) times and merge it
163 return ((((uint64_t)(1) << 32) - msbt
) << 33) | value
;
167 aarch64_b(const Insntype insn
)
168 { return (insn
& 0xFC000000) == 0x14000000; }
171 aarch64_bl(const Insntype insn
)
172 { return (insn
& 0xFC000000) == 0x94000000; }
175 aarch64_blr(const Insntype insn
)
176 { return (insn
& 0xFFFFFC1F) == 0xD63F0000; }
179 aarch64_br(const Insntype insn
)
180 { return (insn
& 0xFFFFFC1F) == 0xD61F0000; }
182 // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for
183 // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops.
185 aarch64_ld(Insntype insn
) { return aarch64_bit(insn
, 22) == 1; }
188 aarch64_ldst(Insntype insn
)
189 { return (insn
& 0x0a000000) == 0x08000000; }
192 aarch64_ldst_ex(Insntype insn
)
193 { return (insn
& 0x3f000000) == 0x08000000; }
196 aarch64_ldst_pcrel(Insntype insn
)
197 { return (insn
& 0x3b000000) == 0x18000000; }
200 aarch64_ldst_nap(Insntype insn
)
201 { return (insn
& 0x3b800000) == 0x28000000; }
204 aarch64_ldstp_pi(Insntype insn
)
205 { return (insn
& 0x3b800000) == 0x28800000; }
208 aarch64_ldstp_o(Insntype insn
)
209 { return (insn
& 0x3b800000) == 0x29000000; }
212 aarch64_ldstp_pre(Insntype insn
)
213 { return (insn
& 0x3b800000) == 0x29800000; }
216 aarch64_ldst_ui(Insntype insn
)
217 { return (insn
& 0x3b200c00) == 0x38000000; }
220 aarch64_ldst_piimm(Insntype insn
)
221 { return (insn
& 0x3b200c00) == 0x38000400; }
224 aarch64_ldst_u(Insntype insn
)
225 { return (insn
& 0x3b200c00) == 0x38000800; }
228 aarch64_ldst_preimm(Insntype insn
)
229 { return (insn
& 0x3b200c00) == 0x38000c00; }
232 aarch64_ldst_ro(Insntype insn
)
233 { return (insn
& 0x3b200c00) == 0x38200800; }
236 aarch64_ldst_uimm(Insntype insn
)
237 { return (insn
& 0x3b000000) == 0x39000000; }
240 aarch64_ldst_simd_m(Insntype insn
)
241 { return (insn
& 0xbfbf0000) == 0x0c000000; }
244 aarch64_ldst_simd_m_pi(Insntype insn
)
245 { return (insn
& 0xbfa00000) == 0x0c800000; }
248 aarch64_ldst_simd_s(Insntype insn
)
249 { return (insn
& 0xbf9f0000) == 0x0d000000; }
252 aarch64_ldst_simd_s_pi(Insntype insn
)
253 { return (insn
& 0xbf800000) == 0x0d800000; }
255 // Classify an INSN if it is indeed a load/store. Return true if INSN is a
256 // LD/ST instruction otherwise return false. For scalar LD/ST instructions
257 // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair
258 // instructions PAIR is TRUE, RT and RT2 are returned.
260 aarch64_mem_op_p(Insntype insn
, unsigned int *rt
, unsigned int *rt2
,
261 bool *pair
, bool *load
)
269 /* Bail out quickly if INSN doesn't fall into the the load-store
271 if (!aarch64_ldst (insn
))
276 if (aarch64_ldst_ex (insn
))
278 *rt
= aarch64_rt (insn
);
280 if (aarch64_bit (insn
, 21) == 1)
283 *rt2
= aarch64_rt2 (insn
);
285 *load
= aarch64_ld (insn
);
288 else if (aarch64_ldst_nap (insn
)
289 || aarch64_ldstp_pi (insn
)
290 || aarch64_ldstp_o (insn
)
291 || aarch64_ldstp_pre (insn
))
294 *rt
= aarch64_rt (insn
);
295 *rt2
= aarch64_rt2 (insn
);
296 *load
= aarch64_ld (insn
);
299 else if (aarch64_ldst_pcrel (insn
)
300 || aarch64_ldst_ui (insn
)
301 || aarch64_ldst_piimm (insn
)
302 || aarch64_ldst_u (insn
)
303 || aarch64_ldst_preimm (insn
)
304 || aarch64_ldst_ro (insn
)
305 || aarch64_ldst_uimm (insn
))
307 *rt
= aarch64_rt (insn
);
309 if (aarch64_ldst_pcrel (insn
))
311 opc
= aarch64_bits (insn
, 22, 2);
312 v
= aarch64_bit (insn
, 26);
313 opc_v
= opc
| (v
<< 2);
314 *load
= (opc_v
== 1 || opc_v
== 2 || opc_v
== 3
315 || opc_v
== 5 || opc_v
== 7);
318 else if (aarch64_ldst_simd_m (insn
)
319 || aarch64_ldst_simd_m_pi (insn
))
321 *rt
= aarch64_rt (insn
);
322 *load
= aarch64_bit (insn
, 22);
323 opcode
= (insn
>> 12) & 0xf;
350 else if (aarch64_ldst_simd_s (insn
)
351 || aarch64_ldst_simd_s_pi (insn
))
353 *rt
= aarch64_rt (insn
);
354 r
= (insn
>> 21) & 1;
355 *load
= aarch64_bit (insn
, 22);
356 opcode
= (insn
>> 13) & 0x7;
368 *rt2
= *rt
+ (r
== 0 ? 2 : 3);
376 *rt2
= *rt
+ (r
== 0 ? 2 : 3);
385 } // End of "aarch64_mem_op_p".
387 // Return true if INSN is mac insn.
389 aarch64_mac(Insntype insn
)
390 { return (insn
& 0xff000000) == 0x9b000000; }
392 // Return true if INSN is multiply-accumulate.
393 // (This is similar to implementaton in elfnn-aarch64.c.)
395 aarch64_mlxl(Insntype insn
)
397 uint32_t op31
= aarch64_op31(insn
);
398 if (aarch64_mac(insn
)
399 && (op31
== 0 || op31
== 1 || op31
== 5)
400 /* Exclude MUL instructions which are encoded as a multiple-accumulate
402 && aarch64_ra(insn
) != AARCH64_ZR
)
408 }; // End of "AArch64_insn_utilities".
411 // Insn length in byte.
413 template<bool big_endian
>
414 const int AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
= 4;
417 // Zero register encoding - 31.
419 template<bool big_endian
>
420 const unsigned int AArch64_insn_utilities
<big_endian
>::AARCH64_ZR
= 0x1f;
423 // Output_data_got_aarch64 class.
425 template<int size
, bool big_endian
>
426 class Output_data_got_aarch64
: public Output_data_got
<size
, big_endian
>
429 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
430 Output_data_got_aarch64(Symbol_table
* symtab
, Layout
* layout
)
431 : Output_data_got
<size
, big_endian
>(),
432 symbol_table_(symtab
), layout_(layout
)
435 // Add a static entry for the GOT entry at OFFSET. GSYM is a global
436 // symbol and R_TYPE is the code of a dynamic relocation that needs to be
437 // applied in a static link.
439 add_static_reloc(unsigned int got_offset
, unsigned int r_type
, Symbol
* gsym
)
440 { this->static_relocs_
.push_back(Static_reloc(got_offset
, r_type
, gsym
)); }
443 // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object
444 // defining a local symbol with INDEX. R_TYPE is the code of a dynamic
445 // relocation that needs to be applied in a static link.
447 add_static_reloc(unsigned int got_offset
, unsigned int r_type
,
448 Sized_relobj_file
<size
, big_endian
>* relobj
,
451 this->static_relocs_
.push_back(Static_reloc(got_offset
, r_type
, relobj
,
457 // Write out the GOT table.
459 do_write(Output_file
* of
) {
460 // The first entry in the GOT is the address of the .dynamic section.
461 gold_assert(this->data_size() >= size
/ 8);
462 Output_section
* dynamic
= this->layout_
->dynamic_section();
463 Valtype dynamic_addr
= dynamic
== NULL
? 0 : dynamic
->address();
464 this->replace_constant(0, dynamic_addr
);
465 Output_data_got
<size
, big_endian
>::do_write(of
);
467 // Handling static relocs
468 if (this->static_relocs_
.empty())
471 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
473 gold_assert(parameters
->doing_static_link());
474 const off_t offset
= this->offset();
475 const section_size_type oview_size
=
476 convert_to_section_size_type(this->data_size());
477 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
479 Output_segment
* tls_segment
= this->layout_
->tls_segment();
480 gold_assert(tls_segment
!= NULL
);
482 AArch64_address aligned_tcb_address
=
483 align_address(Target_aarch64
<size
, big_endian
>::TCB_SIZE
,
484 tls_segment
->maximum_alignment());
486 for (size_t i
= 0; i
< this->static_relocs_
.size(); ++i
)
488 Static_reloc
& reloc(this->static_relocs_
[i
]);
489 AArch64_address value
;
491 if (!reloc
.symbol_is_global())
493 Sized_relobj_file
<size
, big_endian
>* object
= reloc
.relobj();
494 const Symbol_value
<size
>* psymval
=
495 reloc
.relobj()->local_symbol(reloc
.index());
497 // We are doing static linking. Issue an error and skip this
498 // relocation if the symbol is undefined or in a discarded_section.
500 unsigned int shndx
= psymval
->input_shndx(&is_ordinary
);
501 if ((shndx
== elfcpp::SHN_UNDEF
)
503 && shndx
!= elfcpp::SHN_UNDEF
504 && !object
->is_section_included(shndx
)
505 && !this->symbol_table_
->is_section_folded(object
, shndx
)))
507 gold_error(_("undefined or discarded local symbol %u from "
508 " object %s in GOT"),
509 reloc
.index(), reloc
.relobj()->name().c_str());
512 value
= psymval
->value(object
, 0);
516 const Symbol
* gsym
= reloc
.symbol();
517 gold_assert(gsym
!= NULL
);
518 if (gsym
->is_forwarder())
519 gsym
= this->symbol_table_
->resolve_forwards(gsym
);
521 // We are doing static linking. Issue an error and skip this
522 // relocation if the symbol is undefined or in a discarded_section
523 // unless it is a weakly_undefined symbol.
524 if ((gsym
->is_defined_in_discarded_section()
525 || gsym
->is_undefined())
526 && !gsym
->is_weak_undefined())
528 gold_error(_("undefined or discarded symbol %s in GOT"),
533 if (!gsym
->is_weak_undefined())
535 const Sized_symbol
<size
>* sym
=
536 static_cast<const Sized_symbol
<size
>*>(gsym
);
537 value
= sym
->value();
543 unsigned got_offset
= reloc
.got_offset();
544 gold_assert(got_offset
< oview_size
);
546 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype Valtype
;
547 Valtype
* wv
= reinterpret_cast<Valtype
*>(oview
+ got_offset
);
549 switch (reloc
.r_type())
551 case elfcpp::R_AARCH64_TLS_DTPREL64
:
554 case elfcpp::R_AARCH64_TLS_TPREL64
:
555 x
= value
+ aligned_tcb_address
;
560 elfcpp::Swap
<size
, big_endian
>::writeval(wv
, x
);
563 of
->write_output_view(offset
, oview_size
, oview
);
567 // Symbol table of the output object.
568 Symbol_table
* symbol_table_
;
569 // A pointer to the Layout class, so that we can find the .dynamic
570 // section when we write out the GOT section.
573 // This class represent dynamic relocations that need to be applied by
574 // gold because we are using TLS relocations in a static link.
578 Static_reloc(unsigned int got_offset
, unsigned int r_type
, Symbol
* gsym
)
579 : got_offset_(got_offset
), r_type_(r_type
), symbol_is_global_(true)
580 { this->u_
.global
.symbol
= gsym
; }
582 Static_reloc(unsigned int got_offset
, unsigned int r_type
,
583 Sized_relobj_file
<size
, big_endian
>* relobj
, unsigned int index
)
584 : got_offset_(got_offset
), r_type_(r_type
), symbol_is_global_(false)
586 this->u_
.local
.relobj
= relobj
;
587 this->u_
.local
.index
= index
;
590 // Return the GOT offset.
593 { return this->got_offset_
; }
598 { return this->r_type_
; }
600 // Whether the symbol is global or not.
602 symbol_is_global() const
603 { return this->symbol_is_global_
; }
605 // For a relocation against a global symbol, the global symbol.
609 gold_assert(this->symbol_is_global_
);
610 return this->u_
.global
.symbol
;
613 // For a relocation against a local symbol, the defining object.
614 Sized_relobj_file
<size
, big_endian
>*
617 gold_assert(!this->symbol_is_global_
);
618 return this->u_
.local
.relobj
;
621 // For a relocation against a local symbol, the local symbol index.
625 gold_assert(!this->symbol_is_global_
);
626 return this->u_
.local
.index
;
630 // GOT offset of the entry to which this relocation is applied.
631 unsigned int got_offset_
;
632 // Type of relocation.
633 unsigned int r_type_
;
634 // Whether this relocation is against a global symbol.
635 bool symbol_is_global_
;
636 // A global or local symbol.
641 // For a global symbol, the symbol itself.
646 // For a local symbol, the object defining the symbol.
647 Sized_relobj_file
<size
, big_endian
>* relobj
;
648 // For a local symbol, the symbol index.
652 }; // End of inner class Static_reloc
654 std::vector
<Static_reloc
> static_relocs_
;
655 }; // End of Output_data_got_aarch64
658 template<int size
, bool big_endian
>
659 class AArch64_input_section
;
662 template<int size
, bool big_endian
>
663 class AArch64_output_section
;
666 template<int size
, bool big_endian
>
667 class AArch64_relobj
;
670 // Stub type enum constants.
676 // Using adrp/add pair, 4 insns (including alignment) without mem access,
677 // the fastest stub. This has a limited jump distance, which is tested by
678 // aarch64_valid_for_adrp_p.
681 // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
682 // unlimited in jump distance.
683 ST_LONG_BRANCH_ABS
= 2,
685 // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1
686 // mem access, slowest one. Only used in position independent executables.
687 ST_LONG_BRANCH_PCREL
= 3,
689 // Stub for erratum 843419 handling.
692 // Stub for erratum 835769 handling.
695 // Number of total stub types.
700 // Struct that wraps insns for a particular stub. All stub templates are
701 // created/initialized as constants by Stub_template_repertoire.
703 template<bool big_endian
>
706 const typename AArch64_insn_utilities
<big_endian
>::Insntype
* insns
;
711 // Simple singleton class that creates/initializes/stores all types of stub
714 template<bool big_endian
>
715 class Stub_template_repertoire
718 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
720 // Single static method to get stub template for a given stub type.
721 static const Stub_template
<big_endian
>*
722 get_stub_template(int type
)
724 static Stub_template_repertoire
<big_endian
> singleton
;
725 return singleton
.stub_templates_
[type
];
729 // Constructor - creates/initializes all stub templates.
730 Stub_template_repertoire();
731 ~Stub_template_repertoire()
734 // Disallowing copy ctor and copy assignment operator.
735 Stub_template_repertoire(Stub_template_repertoire
&);
736 Stub_template_repertoire
& operator=(Stub_template_repertoire
&);
738 // Data that stores all insn templates.
739 const Stub_template
<big_endian
>* stub_templates_
[ST_NUMBER
];
740 }; // End of "class Stub_template_repertoire".
743 // Constructor - creates/initilizes all stub templates.
745 template<bool big_endian
>
746 Stub_template_repertoire
<big_endian
>::Stub_template_repertoire()
748 // Insn array definitions.
749 const static Insntype ST_NONE_INSNS
[] = {};
751 const static Insntype ST_ADRP_BRANCH_INSNS
[] =
753 0x90000010, /* adrp ip0, X */
754 /* ADR_PREL_PG_HI21(X) */
755 0x91000210, /* add ip0, ip0, :lo12:X */
756 /* ADD_ABS_LO12_NC(X) */
757 0xd61f0200, /* br ip0 */
758 0x00000000, /* alignment padding */
761 const static Insntype ST_LONG_BRANCH_ABS_INSNS
[] =
763 0x58000050, /* ldr ip0, 0x8 */
764 0xd61f0200, /* br ip0 */
765 0x00000000, /* address field */
766 0x00000000, /* address fields */
769 const static Insntype ST_LONG_BRANCH_PCREL_INSNS
[] =
771 0x58000090, /* ldr ip0, 0x10 */
772 0x10000011, /* adr ip1, #0 */
773 0x8b110210, /* add ip0, ip0, ip1 */
774 0xd61f0200, /* br ip0 */
775 0x00000000, /* address field */
776 0x00000000, /* address field */
777 0x00000000, /* alignment padding */
778 0x00000000, /* alignment padding */
781 const static Insntype ST_E_843419_INSNS
[] =
783 0x00000000, /* Placeholder for erratum insn. */
784 0x14000000, /* b <label> */
787 // ST_E_835769 has the same stub template as ST_E_843419.
788 const static Insntype
* ST_E_835769_INSNS
= ST_E_843419_INSNS
;
790 #define install_insn_template(T) \
791 const static Stub_template<big_endian> template_##T = { \
792 T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \
793 this->stub_templates_[T] = &template_##T
795 install_insn_template(ST_NONE
);
796 install_insn_template(ST_ADRP_BRANCH
);
797 install_insn_template(ST_LONG_BRANCH_ABS
);
798 install_insn_template(ST_LONG_BRANCH_PCREL
);
799 install_insn_template(ST_E_843419
);
800 install_insn_template(ST_E_835769
);
802 #undef install_insn_template
806 // Base class for stubs.
808 template<int size
, bool big_endian
>
812 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
813 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
815 static const AArch64_address invalid_address
=
816 static_cast<AArch64_address
>(-1);
818 static const section_offset_type invalid_offset
=
819 static_cast<section_offset_type
>(-1);
822 : destination_address_(invalid_address
),
823 offset_(invalid_offset
),
833 { return this->type_
; }
835 // Get stub template that provides stub insn information.
836 const Stub_template
<big_endian
>*
837 stub_template() const
839 return Stub_template_repertoire
<big_endian
>::
840 get_stub_template(this->type());
843 // Get destination address.
845 destination_address() const
847 gold_assert(this->destination_address_
!= this->invalid_address
);
848 return this->destination_address_
;
851 // Set destination address.
853 set_destination_address(AArch64_address address
)
855 gold_assert(address
!= this->invalid_address
);
856 this->destination_address_
= address
;
859 // Reset the destination address.
861 reset_destination_address()
862 { this->destination_address_
= this->invalid_address
; }
864 // Get offset of code stub. For Reloc_stub, it is the offset from the
865 // beginning of its containing stub table; for Erratum_stub, it is the offset
866 // from the end of reloc_stubs.
870 gold_assert(this->offset_
!= this->invalid_offset
);
871 return this->offset_
;
876 set_offset(section_offset_type offset
)
877 { this->offset_
= offset
; }
879 // Return the stub insn.
882 { return this->stub_template()->insns
; }
884 // Return num of stub insns.
887 { return this->stub_template()->insn_num
; }
889 // Get size of the stub.
893 return this->insn_num() *
894 AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
897 // Write stub to output file.
899 write(unsigned char* view
, section_size_type view_size
)
900 { this->do_write(view
, view_size
); }
903 // Abstract method to be implemented by sub-classes.
905 do_write(unsigned char*, section_size_type
) = 0;
908 // The last insn of a stub is a jump to destination insn. This field records
909 // the destination address.
910 AArch64_address destination_address_
;
911 // The stub offset. Note this has difference interpretations between an
912 // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the
913 // beginning of the containing stub_table, whereas for Erratum_stub, this is
914 // the offset from the end of reloc_stubs.
915 section_offset_type offset_
;
918 }; // End of "Stub_base".
921 // Erratum stub class. An erratum stub differs from a reloc stub in that for
922 // each erratum occurrence, we generate an erratum stub. We never share erratum
923 // stubs, whereas for reloc stubs, different branches insns share a single reloc
924 // stub as long as the branch targets are the same. (More to the point, reloc
925 // stubs can be shared because they're used to reach a specific target, whereas
926 // erratum stubs branch back to the original control flow.)
928 template<int size
, bool big_endian
>
929 class Erratum_stub
: public Stub_base
<size
, big_endian
>
932 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
933 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
934 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
935 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
937 static const int STUB_ADDR_ALIGN
;
939 static const Insntype invalid_insn
= static_cast<Insntype
>(-1);
941 Erratum_stub(The_aarch64_relobj
* relobj
, int type
,
942 unsigned shndx
, unsigned int sh_offset
)
943 : Stub_base
<size
, big_endian
>(type
), relobj_(relobj
),
944 shndx_(shndx
), sh_offset_(sh_offset
),
945 erratum_insn_(invalid_insn
),
946 erratum_address_(this->invalid_address
)
951 // Return the object that contains the erratum.
954 { return this->relobj_
; }
956 // Get section index of the erratum.
959 { return this->shndx_
; }
961 // Get section offset of the erratum.
964 { return this->sh_offset_
; }
966 // Get the erratum insn. This is the insn located at erratum_insn_address.
970 gold_assert(this->erratum_insn_
!= this->invalid_insn
);
971 return this->erratum_insn_
;
974 // Set the insn that the erratum happens to.
976 set_erratum_insn(Insntype insn
)
977 { this->erratum_insn_
= insn
; }
979 // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a
980 // relocation spot, in this case, the erratum_insn_ recorded at scanning phase
981 // is no longer the one we want to write out to the stub, update erratum_insn_
982 // with relocated version. Also note that in this case xn must not be "PC", so
983 // it is safe to move the erratum insn from the origin place to the stub. For
984 // 835769, the erratum insn is multiply-accumulate insn, which could not be a
985 // relocation spot (assertion added though).
987 update_erratum_insn(Insntype insn
)
989 gold_assert(this->erratum_insn_
!= this->invalid_insn
);
990 switch (this->type())
993 gold_assert(Insn_utilities::aarch64_ldst_uimm(insn
));
994 gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn()));
995 gold_assert(Insn_utilities::aarch64_rd(insn
) ==
996 Insn_utilities::aarch64_rd(this->erratum_insn()));
997 gold_assert(Insn_utilities::aarch64_rn(insn
) ==
998 Insn_utilities::aarch64_rn(this->erratum_insn()));
999 // Update plain ld/st insn with relocated insn.
1000 this->erratum_insn_
= insn
;
1003 gold_assert(insn
== this->erratum_insn());
1011 // Return the address where an erratum must be done.
1013 erratum_address() const
1015 gold_assert(this->erratum_address_
!= this->invalid_address
);
1016 return this->erratum_address_
;
1019 // Set the address where an erratum must be done.
1021 set_erratum_address(AArch64_address addr
)
1022 { this->erratum_address_
= addr
; }
1024 // Comparator used to group Erratum_stubs in a set by (obj, shndx,
1025 // sh_offset). We do not include 'type' in the calculation, because there is
1026 // at most one stub type at (obj, shndx, sh_offset).
1028 operator<(const Erratum_stub
<size
, big_endian
>& k
) const
1032 // We group stubs by relobj.
1033 if (this->relobj_
!= k
.relobj_
)
1034 return this->relobj_
< k
.relobj_
;
1035 // Then by section index.
1036 if (this->shndx_
!= k
.shndx_
)
1037 return this->shndx_
< k
.shndx_
;
1038 // Lastly by section offset.
1039 return this->sh_offset_
< k
.sh_offset_
;
1044 do_write(unsigned char*, section_size_type
);
1047 // The object that needs to be fixed.
1048 The_aarch64_relobj
* relobj_
;
1049 // The shndx in the object that needs to be fixed.
1050 const unsigned int shndx_
;
1051 // The section offset in the obejct that needs to be fixed.
1052 const unsigned int sh_offset_
;
1053 // The insn to be fixed.
1054 Insntype erratum_insn_
;
1055 // The address of the above insn.
1056 AArch64_address erratum_address_
;
1057 }; // End of "Erratum_stub".
1060 // Erratum sub class to wrap additional info needed by 843419. In fixing this
1061 // erratum, we may choose to replace 'adrp' with 'adr', in this case, we need
1062 // adrp's code position (two or three insns before erratum insn itself).
1064 template<int size
, bool big_endian
>
1065 class E843419_stub
: public Erratum_stub
<size
, big_endian
>
1068 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
1070 E843419_stub(AArch64_relobj
<size
, big_endian
>* relobj
,
1071 unsigned int shndx
, unsigned int sh_offset
,
1072 unsigned int adrp_sh_offset
)
1073 : Erratum_stub
<size
, big_endian
>(relobj
, ST_E_843419
, shndx
, sh_offset
),
1074 adrp_sh_offset_(adrp_sh_offset
)
1078 adrp_sh_offset() const
1079 { return this->adrp_sh_offset_
; }
1082 // Section offset of "adrp". (We do not need a "adrp_shndx_" field, because we
1083 // can can obtain it from its parent.)
1084 const unsigned int adrp_sh_offset_
;
1088 template<int size
, bool big_endian
>
1089 const int Erratum_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1091 // Comparator used in set definition.
1092 template<int size
, bool big_endian
>
1093 struct Erratum_stub_less
1096 operator()(const Erratum_stub
<size
, big_endian
>* s1
,
1097 const Erratum_stub
<size
, big_endian
>* s2
) const
1098 { return *s1
< *s2
; }
1101 // Erratum_stub implementation for writing stub to output file.
1103 template<int size
, bool big_endian
>
1105 Erratum_stub
<size
, big_endian
>::do_write(unsigned char* view
, section_size_type
)
1107 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1108 const Insntype
* insns
= this->insns();
1109 uint32_t num_insns
= this->insn_num();
1110 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1111 // For current implemented erratum 843419 and 835769, the first insn in the
1112 // stub is always a copy of the problematic insn (in 843419, the mem access
1113 // insn, in 835769, the mac insn), followed by a jump-back.
1114 elfcpp::Swap
<32, big_endian
>::writeval(ip
, this->erratum_insn());
1115 for (uint32_t i
= 1; i
< num_insns
; ++i
)
1116 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1120 // Reloc stub class.
1122 template<int size
, bool big_endian
>
1123 class Reloc_stub
: public Stub_base
<size
, big_endian
>
1126 typedef Reloc_stub
<size
, big_endian
> This
;
1127 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1129 // Branch range. This is used to calculate the section group size, as well as
1130 // determine whether a stub is needed.
1131 static const int MAX_BRANCH_OFFSET
= ((1 << 25) - 1) << 2;
1132 static const int MIN_BRANCH_OFFSET
= -((1 << 25) << 2);
1134 // Constant used to determine if an offset fits in the adrp instruction
1136 static const int MAX_ADRP_IMM
= (1 << 20) - 1;
1137 static const int MIN_ADRP_IMM
= -(1 << 20);
1139 static const int BYTES_PER_INSN
= 4;
1140 static const int STUB_ADDR_ALIGN
;
1142 // Determine whether the offset fits in the jump/branch instruction.
1144 aarch64_valid_branch_offset_p(int64_t offset
)
1145 { return offset
>= MIN_BRANCH_OFFSET
&& offset
<= MAX_BRANCH_OFFSET
; }
1147 // Determine whether the offset fits in the adrp immediate field.
1149 aarch64_valid_for_adrp_p(AArch64_address location
, AArch64_address dest
)
1151 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
1152 int64_t adrp_imm
= (Reloc::Page(dest
) - Reloc::Page(location
)) >> 12;
1153 return adrp_imm
>= MIN_ADRP_IMM
&& adrp_imm
<= MAX_ADRP_IMM
;
1156 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1159 stub_type_for_reloc(unsigned int r_type
, AArch64_address address
,
1160 AArch64_address target
);
1162 Reloc_stub(int type
)
1163 : Stub_base
<size
, big_endian
>(type
)
1169 // The key class used to index the stub instance in the stub table's stub map.
1173 Key(int type
, const Symbol
* symbol
, const Relobj
* relobj
,
1174 unsigned int r_sym
, int32_t addend
)
1175 : type_(type
), addend_(addend
)
1179 this->r_sym_
= Reloc_stub::invalid_index
;
1180 this->u_
.symbol
= symbol
;
1184 gold_assert(relobj
!= NULL
&& r_sym
!= invalid_index
);
1185 this->r_sym_
= r_sym
;
1186 this->u_
.relobj
= relobj
;
1193 // Return stub type.
1196 { return this->type_
; }
1198 // Return the local symbol index or invalid_index.
1201 { return this->r_sym_
; }
1203 // Return the symbol if there is one.
1206 { return this->r_sym_
== invalid_index
? this->u_
.symbol
: NULL
; }
1208 // Return the relobj if there is one.
1211 { return this->r_sym_
!= invalid_index
? this->u_
.relobj
: NULL
; }
1213 // Whether this equals to another key k.
1215 eq(const Key
& k
) const
1217 return ((this->type_
== k
.type_
)
1218 && (this->r_sym_
== k
.r_sym_
)
1219 && ((this->r_sym_
!= Reloc_stub::invalid_index
)
1220 ? (this->u_
.relobj
== k
.u_
.relobj
)
1221 : (this->u_
.symbol
== k
.u_
.symbol
))
1222 && (this->addend_
== k
.addend_
));
1225 // Return a hash value.
1229 size_t name_hash_value
= gold::string_hash
<char>(
1230 (this->r_sym_
!= Reloc_stub::invalid_index
)
1231 ? this->u_
.relobj
->name().c_str()
1232 : this->u_
.symbol
->name());
1233 // We only have 4 stub types.
1234 size_t stub_type_hash_value
= 0x03 & this->type_
;
1235 return (name_hash_value
1236 ^ stub_type_hash_value
1237 ^ ((this->r_sym_
& 0x3fff) << 2)
1238 ^ ((this->addend_
& 0xffff) << 16));
1241 // Functors for STL associative containers.
1245 operator()(const Key
& k
) const
1246 { return k
.hash_value(); }
1252 operator()(const Key
& k1
, const Key
& k2
) const
1253 { return k1
.eq(k2
); }
1259 // If this is a local symbol, this is the index in the defining object.
1260 // Otherwise, it is invalid_index for a global symbol.
1261 unsigned int r_sym_
;
1262 // If r_sym_ is an invalid index, this points to a global symbol.
1263 // Otherwise, it points to a relobj. We used the unsized and target
1264 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1265 // Arm_relobj, in order to avoid making the stub class a template
1266 // as most of the stub machinery is endianness-neutral. However, it
1267 // may require a bit of casting done by users of this class.
1270 const Symbol
* symbol
;
1271 const Relobj
* relobj
;
1273 // Addend associated with a reloc.
1275 }; // End of inner class Reloc_stub::Key
1278 // This may be overridden in the child class.
1280 do_write(unsigned char*, section_size_type
);
1283 static const unsigned int invalid_index
= static_cast<unsigned int>(-1);
1284 }; // End of Reloc_stub
1286 template<int size
, bool big_endian
>
1287 const int Reloc_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1289 // Write data to output file.
1291 template<int size
, bool big_endian
>
1293 Reloc_stub
<size
, big_endian
>::
1294 do_write(unsigned char* view
, section_size_type
)
1296 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1297 const uint32_t* insns
= this->insns();
1298 uint32_t num_insns
= this->insn_num();
1299 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1300 for (uint32_t i
= 0; i
< num_insns
; ++i
)
1301 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1305 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1308 template<int size
, bool big_endian
>
1310 Reloc_stub
<size
, big_endian
>::stub_type_for_reloc(
1311 unsigned int r_type
, AArch64_address location
, AArch64_address dest
)
1313 int64_t branch_offset
= 0;
1316 case elfcpp::R_AARCH64_CALL26
:
1317 case elfcpp::R_AARCH64_JUMP26
:
1318 branch_offset
= dest
- location
;
1324 if (aarch64_valid_branch_offset_p(branch_offset
))
1327 if (aarch64_valid_for_adrp_p(location
, dest
))
1328 return ST_ADRP_BRANCH
;
1330 // Always use PC-relative addressing in case of -shared or -pie.
1331 if (parameters
->options().output_is_position_independent())
1332 return ST_LONG_BRANCH_PCREL
;
1334 // This saves 2 insns per stub, compared to ST_LONG_BRANCH_PCREL.
1335 // But is only applicable to non-shared or non-pie.
1336 return ST_LONG_BRANCH_ABS
;
1339 // A class to hold stubs for the ARM target.
1341 template<int size
, bool big_endian
>
1342 class Stub_table
: public Output_data
1345 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1346 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1347 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
1348 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1349 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
1350 typedef typename
The_reloc_stub::Key The_reloc_stub_key
;
1351 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1352 typedef Erratum_stub_less
<size
, big_endian
> The_erratum_stub_less
;
1353 typedef typename
The_reloc_stub_key::hash The_reloc_stub_key_hash
;
1354 typedef typename
The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to
;
1355 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1356 typedef Unordered_map
<The_reloc_stub_key
, The_reloc_stub
*,
1357 The_reloc_stub_key_hash
, The_reloc_stub_key_equal_to
>
1359 typedef typename
Reloc_stub_map::const_iterator Reloc_stub_map_const_iter
;
1360 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
1362 typedef std::set
<The_erratum_stub
*, The_erratum_stub_less
> Erratum_stub_set
;
1363 typedef typename
Erratum_stub_set::iterator Erratum_stub_set_iter
;
1365 Stub_table(The_aarch64_input_section
* owner
)
1366 : Output_data(), owner_(owner
), reloc_stubs_size_(0),
1367 erratum_stubs_size_(0), prev_data_size_(0)
1373 The_aarch64_input_section
*
1377 // Whether this stub table is empty.
1380 { return reloc_stubs_
.empty() && erratum_stubs_
.empty(); }
1382 // Return the current data size.
1384 current_data_size() const
1385 { return this->current_data_size_for_child(); }
1387 // Add a STUB using KEY. The caller is responsible for avoiding addition
1388 // if a STUB with the same key has already been added.
1390 add_reloc_stub(The_reloc_stub
* stub
, const The_reloc_stub_key
& key
);
1392 // Add an erratum stub into the erratum stub set. The set is ordered by
1393 // (relobj, shndx, sh_offset).
1395 add_erratum_stub(The_erratum_stub
* stub
);
1397 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1399 find_erratum_stub(The_aarch64_relobj
* a64relobj
,
1400 unsigned int shndx
, unsigned int sh_offset
);
1402 // Find all the erratums for a given input section. The return value is a pair
1403 // of iterators [begin, end).
1404 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1405 find_erratum_stubs_for_input_section(The_aarch64_relobj
* a64relobj
,
1406 unsigned int shndx
);
1408 // Compute the erratum stub address.
1410 erratum_stub_address(The_erratum_stub
* stub
) const
1412 AArch64_address r
= align_address(this->address() + this->reloc_stubs_size_
,
1413 The_erratum_stub::STUB_ADDR_ALIGN
);
1414 r
+= stub
->offset();
1418 // Finalize stubs. No-op here, just for completeness.
1423 // Look up a relocation stub using KEY. Return NULL if there is none.
1425 find_reloc_stub(The_reloc_stub_key
& key
)
1427 Reloc_stub_map_const_iter p
= this->reloc_stubs_
.find(key
);
1428 return (p
!= this->reloc_stubs_
.end()) ? p
->second
: NULL
;
1431 // Relocate stubs in this stub table.
1433 relocate_stubs(const The_relocate_info
*,
1434 The_target_aarch64
*,
1440 // Update data size at the end of a relaxation pass. Return true if data size
1441 // is different from that of the previous relaxation pass.
1443 update_data_size_changed_p()
1445 // No addralign changed here.
1446 off_t s
= align_address(this->reloc_stubs_size_
,
1447 The_erratum_stub::STUB_ADDR_ALIGN
)
1448 + this->erratum_stubs_size_
;
1449 bool changed
= (s
!= this->prev_data_size_
);
1450 this->prev_data_size_
= s
;
1455 // Write out section contents.
1457 do_write(Output_file
*);
1459 // Return the required alignment.
1461 do_addralign() const
1463 return std::max(The_reloc_stub::STUB_ADDR_ALIGN
,
1464 The_erratum_stub::STUB_ADDR_ALIGN
);
1467 // Reset address and file offset.
1469 do_reset_address_and_file_offset()
1470 { this->set_current_data_size_for_child(this->prev_data_size_
); }
1472 // Set final data size.
1474 set_final_data_size()
1475 { this->set_data_size(this->current_data_size()); }
1478 // Relocate one stub.
1480 relocate_stub(The_reloc_stub
*,
1481 const The_relocate_info
*,
1482 The_target_aarch64
*,
1489 // Owner of this stub table.
1490 The_aarch64_input_section
* owner_
;
1491 // The relocation stubs.
1492 Reloc_stub_map reloc_stubs_
;
1493 // The erratum stubs.
1494 Erratum_stub_set erratum_stubs_
;
1495 // Size of reloc stubs.
1496 off_t reloc_stubs_size_
;
1497 // Size of erratum stubs.
1498 off_t erratum_stubs_size_
;
1499 // data size of this in the previous pass.
1500 off_t prev_data_size_
;
1501 }; // End of Stub_table
1504 // Add an erratum stub into the erratum stub set. The set is ordered by
1505 // (relobj, shndx, sh_offset).
1507 template<int size
, bool big_endian
>
1509 Stub_table
<size
, big_endian
>::add_erratum_stub(The_erratum_stub
* stub
)
1511 std::pair
<Erratum_stub_set_iter
, bool> ret
=
1512 this->erratum_stubs_
.insert(stub
);
1513 gold_assert(ret
.second
);
1514 this->erratum_stubs_size_
= align_address(
1515 this->erratum_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1516 stub
->set_offset(this->erratum_stubs_size_
);
1517 this->erratum_stubs_size_
+= stub
->stub_size();
1521 // Find if such erratum exists for given (obj, shndx, sh_offset).
1523 template<int size
, bool big_endian
>
1524 Erratum_stub
<size
, big_endian
>*
1525 Stub_table
<size
, big_endian
>::find_erratum_stub(
1526 The_aarch64_relobj
* a64relobj
, unsigned int shndx
, unsigned int sh_offset
)
1528 // A dummy object used as key to search in the set.
1529 The_erratum_stub
key(a64relobj
, ST_NONE
,
1531 Erratum_stub_set_iter i
= this->erratum_stubs_
.find(&key
);
1532 if (i
!= this->erratum_stubs_
.end())
1534 The_erratum_stub
* stub(*i
);
1535 gold_assert(stub
->erratum_insn() != 0);
1542 // Find all the errata for a given input section. The return value is a pair of
1543 // iterators [begin, end).
1545 template<int size
, bool big_endian
>
1546 std::pair
<typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
,
1547 typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
>
1548 Stub_table
<size
, big_endian
>::find_erratum_stubs_for_input_section(
1549 The_aarch64_relobj
* a64relobj
, unsigned int shndx
)
1551 typedef std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
> Result_pair
;
1552 Erratum_stub_set_iter start
, end
;
1553 The_erratum_stub
low_key(a64relobj
, ST_NONE
, shndx
, 0);
1554 start
= this->erratum_stubs_
.lower_bound(&low_key
);
1555 if (start
== this->erratum_stubs_
.end())
1556 return Result_pair(this->erratum_stubs_
.end(),
1557 this->erratum_stubs_
.end());
1559 while (end
!= this->erratum_stubs_
.end() &&
1560 (*end
)->relobj() == a64relobj
&& (*end
)->shndx() == shndx
)
1562 return Result_pair(start
, end
);
1566 // Add a STUB using KEY. The caller is responsible for avoiding addition
1567 // if a STUB with the same key has already been added.
1569 template<int size
, bool big_endian
>
1571 Stub_table
<size
, big_endian
>::add_reloc_stub(
1572 The_reloc_stub
* stub
, const The_reloc_stub_key
& key
)
1574 gold_assert(stub
->type() == key
.type());
1575 this->reloc_stubs_
[key
] = stub
;
1577 // Assign stub offset early. We can do this because we never remove
1578 // reloc stubs and they are in the beginning of the stub table.
1579 this->reloc_stubs_size_
= align_address(this->reloc_stubs_size_
,
1580 The_reloc_stub::STUB_ADDR_ALIGN
);
1581 stub
->set_offset(this->reloc_stubs_size_
);
1582 this->reloc_stubs_size_
+= stub
->stub_size();
1586 // Relocate all stubs in this stub table.
1588 template<int size
, bool big_endian
>
1590 Stub_table
<size
, big_endian
>::
1591 relocate_stubs(const The_relocate_info
* relinfo
,
1592 The_target_aarch64
* target_aarch64
,
1593 Output_section
* output_section
,
1594 unsigned char* view
,
1595 AArch64_address address
,
1596 section_size_type view_size
)
1598 // "view_size" is the total size of the stub_table.
1599 gold_assert(address
== this->address() &&
1600 view_size
== static_cast<section_size_type
>(this->data_size()));
1601 for(Reloc_stub_map_const_iter p
= this->reloc_stubs_
.begin();
1602 p
!= this->reloc_stubs_
.end(); ++p
)
1603 relocate_stub(p
->second
, relinfo
, target_aarch64
, output_section
,
1604 view
, address
, view_size
);
1606 // Just for convenience.
1607 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1609 // Now 'relocate' erratum stubs.
1610 for(Erratum_stub_set_iter i
= this->erratum_stubs_
.begin();
1611 i
!= this->erratum_stubs_
.end(); ++i
)
1613 AArch64_address stub_address
= this->erratum_stub_address(*i
);
1614 // The address of "b" in the stub that is to be "relocated".
1615 AArch64_address stub_b_insn_address
;
1616 // Branch offset that is to be filled in "b" insn.
1618 switch ((*i
)->type())
1622 // The 1st insn of the erratum could be a relocation spot,
1623 // in this case we need to fix it with
1624 // "(*i)->erratum_insn()".
1625 elfcpp::Swap
<32, big_endian
>::writeval(
1626 view
+ (stub_address
- this->address()),
1627 (*i
)->erratum_insn());
1628 // For the erratum, the 2nd insn is a b-insn to be patched
1630 stub_b_insn_address
= stub_address
+ 1 * BPI
;
1631 b_offset
= (*i
)->destination_address() - stub_b_insn_address
;
1632 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1633 view
+ (stub_b_insn_address
- this->address()),
1634 ((unsigned int)(b_offset
)) & 0xfffffff);
1644 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
1646 template<int size
, bool big_endian
>
1648 Stub_table
<size
, big_endian
>::
1649 relocate_stub(The_reloc_stub
* stub
,
1650 const The_relocate_info
* relinfo
,
1651 The_target_aarch64
* target_aarch64
,
1652 Output_section
* output_section
,
1653 unsigned char* view
,
1654 AArch64_address address
,
1655 section_size_type view_size
)
1657 // "offset" is the offset from the beginning of the stub_table.
1658 section_size_type offset
= stub
->offset();
1659 section_size_type stub_size
= stub
->stub_size();
1660 // "view_size" is the total size of the stub_table.
1661 gold_assert(offset
+ stub_size
<= view_size
);
1663 target_aarch64
->relocate_stub(stub
, relinfo
, output_section
,
1664 view
+ offset
, address
+ offset
, view_size
);
1668 // Write out the stubs to file.
1670 template<int size
, bool big_endian
>
1672 Stub_table
<size
, big_endian
>::do_write(Output_file
* of
)
1674 off_t offset
= this->offset();
1675 const section_size_type oview_size
=
1676 convert_to_section_size_type(this->data_size());
1677 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1679 // Write relocation stubs.
1680 for (typename
Reloc_stub_map::const_iterator p
= this->reloc_stubs_
.begin();
1681 p
!= this->reloc_stubs_
.end(); ++p
)
1683 The_reloc_stub
* stub
= p
->second
;
1684 AArch64_address address
= this->address() + stub
->offset();
1685 gold_assert(address
==
1686 align_address(address
, The_reloc_stub::STUB_ADDR_ALIGN
));
1687 stub
->write(oview
+ stub
->offset(), stub
->stub_size());
1690 // Write erratum stubs.
1691 unsigned int erratum_stub_start_offset
=
1692 align_address(this->reloc_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1693 for (typename
Erratum_stub_set::iterator p
= this->erratum_stubs_
.begin();
1694 p
!= this->erratum_stubs_
.end(); ++p
)
1696 The_erratum_stub
* stub(*p
);
1697 stub
->write(oview
+ erratum_stub_start_offset
+ stub
->offset(),
1701 of
->write_output_view(this->offset(), oview_size
, oview
);
1705 // AArch64_relobj class.
1707 template<int size
, bool big_endian
>
1708 class AArch64_relobj
: public Sized_relobj_file
<size
, big_endian
>
1711 typedef AArch64_relobj
<size
, big_endian
> This
;
1712 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1713 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1714 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1715 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1716 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1717 typedef typename
The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter
;
1718 typedef std::vector
<The_stub_table
*> Stub_table_list
;
1719 static const AArch64_address invalid_address
=
1720 static_cast<AArch64_address
>(-1);
1722 AArch64_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1723 const typename
elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1724 : Sized_relobj_file
<size
, big_endian
>(name
, input_file
, offset
, ehdr
),
1731 // Return the stub table of the SHNDX-th section if there is one.
1733 stub_table(unsigned int shndx
) const
1735 gold_assert(shndx
< this->stub_tables_
.size());
1736 return this->stub_tables_
[shndx
];
1739 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1741 set_stub_table(unsigned int shndx
, The_stub_table
* stub_table
)
1743 gold_assert(shndx
< this->stub_tables_
.size());
1744 this->stub_tables_
[shndx
] = stub_table
;
1747 // Entrance to errata scanning.
1749 scan_errata(unsigned int shndx
,
1750 const elfcpp::Shdr
<size
, big_endian
>&,
1751 Output_section
*, const Symbol_table
*,
1752 The_target_aarch64
*);
1754 // Scan all relocation sections for stub generation.
1756 scan_sections_for_stubs(The_target_aarch64
*, const Symbol_table
*,
1759 // Whether a section is a scannable text section.
1761 text_section_is_scannable(const elfcpp::Shdr
<size
, big_endian
>&, unsigned int,
1762 const Output_section
*, const Symbol_table
*);
1764 // Convert regular input section with index SHNDX to a relaxed section.
1766 convert_input_section_to_relaxed_section(unsigned /* shndx */)
1768 // The stubs have relocations and we need to process them after writing
1769 // out the stubs. So relocation now must follow section write.
1770 this->set_relocs_must_follow_section_writes();
1773 // Structure for mapping symbol position.
1774 struct Mapping_symbol_position
1776 Mapping_symbol_position(unsigned int shndx
, AArch64_address offset
):
1777 shndx_(shndx
), offset_(offset
)
1780 // "<" comparator used in ordered_map container.
1782 operator<(const Mapping_symbol_position
& p
) const
1784 return (this->shndx_
< p
.shndx_
1785 || (this->shndx_
== p
.shndx_
&& this->offset_
< p
.offset_
));
1789 unsigned int shndx_
;
1792 AArch64_address offset_
;
1795 typedef std::map
<Mapping_symbol_position
, char> Mapping_symbol_info
;
1798 // Post constructor setup.
1802 // Call parent's setup method.
1803 Sized_relobj_file
<size
, big_endian
>::do_setup();
1805 // Initialize look-up tables.
1806 this->stub_tables_
.resize(this->shnum());
1810 do_relocate_sections(
1811 const Symbol_table
* symtab
, const Layout
* layout
,
1812 const unsigned char* pshdrs
, Output_file
* of
,
1813 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1815 // Count local symbols and (optionally) record mapping info.
1817 do_count_local_symbols(Stringpool_template
<char>*,
1818 Stringpool_template
<char>*);
1821 // Fix all errata in the object.
1823 fix_errata(typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1825 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1828 try_fix_erratum_843419_optimized(
1830 typename Sized_relobj_file
<size
, big_endian
>::View_size
&);
1832 // Whether a section needs to be scanned for relocation stubs.
1834 section_needs_reloc_stub_scanning(const elfcpp::Shdr
<size
, big_endian
>&,
1835 const Relobj::Output_sections
&,
1836 const Symbol_table
*, const unsigned char*);
1838 // List of stub tables.
1839 Stub_table_list stub_tables_
;
1841 // Mapping symbol information sorted by (section index, section_offset).
1842 Mapping_symbol_info mapping_symbol_info_
;
1843 }; // End of AArch64_relobj
1846 // Override to record mapping symbol information.
1847 template<int size
, bool big_endian
>
1849 AArch64_relobj
<size
, big_endian
>::do_count_local_symbols(
1850 Stringpool_template
<char>* pool
, Stringpool_template
<char>* dynpool
)
1852 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(pool
, dynpool
);
1854 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1855 // processing if not fixing erratum.
1856 if (!parameters
->options().fix_cortex_a53_843419()
1857 && !parameters
->options().fix_cortex_a53_835769())
1860 const unsigned int loccount
= this->local_symbol_count();
1864 // Read the symbol table section header.
1865 const unsigned int symtab_shndx
= this->symtab_shndx();
1866 elfcpp::Shdr
<size
, big_endian
>
1867 symtabshdr(this, this->elf_file()->section_header(symtab_shndx
));
1868 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1870 // Read the local symbols.
1871 const int sym_size
=elfcpp::Elf_sizes
<size
>::sym_size
;
1872 gold_assert(loccount
== symtabshdr
.get_sh_info());
1873 off_t locsize
= loccount
* sym_size
;
1874 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1875 locsize
, true, true);
1877 // For mapping symbol processing, we need to read the symbol names.
1878 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
1879 if (strtab_shndx
>= this->shnum())
1881 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
1885 elfcpp::Shdr
<size
, big_endian
>
1886 strtabshdr(this, this->elf_file()->section_header(strtab_shndx
));
1887 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
1889 this->error(_("symbol table name section has wrong type: %u"),
1890 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
1894 const char* pnames
=
1895 reinterpret_cast<const char*>(this->get_view(strtabshdr
.get_sh_offset(),
1896 strtabshdr
.get_sh_size(),
1899 // Skip the first dummy symbol.
1901 typename Sized_relobj_file
<size
, big_endian
>::Local_values
*
1902 plocal_values
= this->local_values();
1903 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1905 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1906 Symbol_value
<size
>& lv((*plocal_values
)[i
]);
1907 AArch64_address input_value
= lv
.input_value();
1909 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1910 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1912 // Mapping symbols could be one of the following 4 forms -
1917 const char* sym_name
= pnames
+ sym
.get_st_name();
1918 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1919 && (sym_name
[2] == '\0' || sym_name
[2] == '.'))
1922 unsigned int input_shndx
=
1923 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1924 gold_assert(is_ordinary
);
1926 Mapping_symbol_position
msp(input_shndx
, input_value
);
1927 // Insert mapping_symbol_info into map whose ordering is defined by
1928 // (shndx, offset_within_section).
1929 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1935 // Fix all errata in the object.
1937 template<int size
, bool big_endian
>
1939 AArch64_relobj
<size
, big_endian
>::fix_errata(
1940 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1942 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1943 unsigned int shnum
= this->shnum();
1944 for (unsigned int i
= 1; i
< shnum
; ++i
)
1946 The_stub_table
* stub_table
= this->stub_table(i
);
1949 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1950 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
1951 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
1954 The_erratum_stub
* stub
= *p
;
1955 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1956 pview((*pviews
)[i
]);
1958 // Double check data before fix.
1959 gold_assert(pview
.address
+ stub
->sh_offset()
1960 == stub
->erratum_address());
1962 // Update previously recorded erratum insn with relocated
1965 reinterpret_cast<Insntype
*>(pview
.view
+ stub
->sh_offset());
1966 Insntype insn_to_fix
= ip
[0];
1967 stub
->update_erratum_insn(insn_to_fix
);
1969 // First try to see if erratum is 843419 and if it can be fixed
1970 // without using branch-to-stub.
1971 if (!try_fix_erratum_843419_optimized(stub
, pview
))
1973 // Replace the erratum insn with a branch-to-stub.
1974 AArch64_address stub_address
=
1975 stub_table
->erratum_stub_address(stub
);
1976 unsigned int b_offset
= stub_address
- stub
->erratum_address();
1977 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1978 pview
.view
+ stub
->sh_offset(), b_offset
& 0xfffffff);
1986 // This is an optimization for 843419. This erratum requires the sequence begin
1987 // with 'adrp', when final value calculated by adrp fits in adr, we can just
1988 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
1989 // in this case, we do not delete the erratum stub (too late to do so), it is
1990 // merely generated without ever being called.)
1992 template<int size
, bool big_endian
>
1994 AArch64_relobj
<size
, big_endian
>::try_fix_erratum_843419_optimized(
1995 The_erratum_stub
* stub
,
1996 typename Sized_relobj_file
<size
, big_endian
>::View_size
& pview
)
1998 if (stub
->type() != ST_E_843419
)
2001 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2002 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
2003 E843419_stub
<size
, big_endian
>* e843419_stub
=
2004 reinterpret_cast<E843419_stub
<size
, big_endian
>*>(stub
);
2005 AArch64_address pc
= pview
.address
+ e843419_stub
->adrp_sh_offset();
2006 Insntype
* adrp_view
= reinterpret_cast<Insntype
*>(
2007 pview
.view
+ e843419_stub
->adrp_sh_offset());
2008 Insntype adrp_insn
= adrp_view
[0];
2009 gold_assert(Insn_utilities::is_adrp(adrp_insn
));
2010 // Get adrp 33-bit signed imm value.
2011 int64_t adrp_imm
= Insn_utilities::
2012 aarch64_adrp_decode_imm(adrp_insn
);
2013 // adrp - final value transferred to target register is calculated as:
2014 // PC[11:0] = Zeros(12)
2015 // adrp_dest_value = PC + adrp_imm;
2016 int64_t adrp_dest_value
= (pc
& ~((1 << 12) - 1)) + adrp_imm
;
2017 // adr -final value transferred to target register is calucalted as:
2020 // PC + adr_imm = adrp_dest_value
2022 // adr_imm = adrp_dest_value - PC
2023 int64_t adr_imm
= adrp_dest_value
- pc
;
2024 // Check if imm fits in adr (21-bit signed).
2025 if (-(1 << 20) <= adr_imm
&& adr_imm
< (1 << 20))
2027 // Convert 'adrp' into 'adr'.
2028 Insntype adr_insn
= adrp_insn
& ((1u << 31) - 1);
2029 adr_insn
= Insn_utilities::
2030 aarch64_adr_encode_imm(adr_insn
, adr_imm
);
2031 elfcpp::Swap
<32, big_endian
>::writeval(adrp_view
, adr_insn
);
2038 // Relocate sections.
2040 template<int size
, bool big_endian
>
2042 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
2043 const Symbol_table
* symtab
, const Layout
* layout
,
2044 const unsigned char* pshdrs
, Output_file
* of
,
2045 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
2047 // Relocate the section data.
2048 this->relocate_section_range(symtab
, layout
, pshdrs
, of
, pviews
,
2049 1, this->shnum() - 1);
2051 // We do not generate stubs if doing a relocatable link.
2052 if (parameters
->options().relocatable())
2055 if (parameters
->options().fix_cortex_a53_843419()
2056 || parameters
->options().fix_cortex_a53_835769())
2057 this->fix_errata(pviews
);
2059 Relocate_info
<size
, big_endian
> relinfo
;
2060 relinfo
.symtab
= symtab
;
2061 relinfo
.layout
= layout
;
2062 relinfo
.object
= this;
2064 // Relocate stub tables.
2065 unsigned int shnum
= this->shnum();
2066 The_target_aarch64
* target
= The_target_aarch64::current_target();
2068 for (unsigned int i
= 1; i
< shnum
; ++i
)
2070 The_aarch64_input_section
* aarch64_input_section
=
2071 target
->find_aarch64_input_section(this, i
);
2072 if (aarch64_input_section
!= NULL
2073 && aarch64_input_section
->is_stub_table_owner()
2074 && !aarch64_input_section
->stub_table()->empty())
2076 Output_section
* os
= this->output_section(i
);
2077 gold_assert(os
!= NULL
);
2079 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
2080 relinfo
.reloc_shdr
= NULL
;
2081 relinfo
.data_shndx
= i
;
2082 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
2084 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2085 view_struct
= (*pviews
)[i
];
2086 gold_assert(view_struct
.view
!= NULL
);
2088 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
2089 off_t offset
= stub_table
->address() - view_struct
.address
;
2090 unsigned char* view
= view_struct
.view
+ offset
;
2091 AArch64_address address
= stub_table
->address();
2092 section_size_type view_size
= stub_table
->data_size();
2093 stub_table
->relocate_stubs(&relinfo
, target
, os
, view
, address
,
2100 // Determine if an input section is scannable for stub processing. SHDR is
2101 // the header of the section and SHNDX is the section index. OS is the output
2102 // section for the input section and SYMTAB is the global symbol table used to
2103 // look up ICF information.
2105 template<int size
, bool big_endian
>
2107 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
2108 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
2109 unsigned int text_shndx
,
2110 const Output_section
* os
,
2111 const Symbol_table
* symtab
)
2113 // Skip any empty sections, unallocated sections or sections whose
2114 // type are not SHT_PROGBITS.
2115 if (text_shdr
.get_sh_size() == 0
2116 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
2117 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2120 // Skip any discarded or ICF'ed sections.
2121 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
2124 // Skip exception frame.
2125 if (strcmp(os
->name(), ".eh_frame") == 0)
2128 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
2129 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2135 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2136 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2138 template<int size
, bool big_endian
>
2140 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2141 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2142 const Relobj::Output_sections
& out_sections
,
2143 const Symbol_table
* symtab
,
2144 const unsigned char* pshdrs
)
2146 unsigned int sh_type
= shdr
.get_sh_type();
2147 if (sh_type
!= elfcpp::SHT_RELA
)
2150 // Ignore empty section.
2151 off_t sh_size
= shdr
.get_sh_size();
2155 // Ignore reloc section with unexpected symbol table. The
2156 // error will be reported in the final link.
2157 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2160 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2161 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2163 // Ignore reloc section with unexpected entsize or uneven size.
2164 // The error will be reported in the final link.
2165 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2168 // Ignore reloc section with bad info. This error will be
2169 // reported in the final link.
2170 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2171 if (text_shndx
>= this->shnum())
2174 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2175 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2176 text_shndx
* shdr_size
);
2177 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2178 out_sections
[text_shndx
], symtab
);
2182 // Scan section SHNDX for erratum 843419 and 835769.
2184 template<int size
, bool big_endian
>
2186 AArch64_relobj
<size
, big_endian
>::scan_errata(
2187 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2188 Output_section
* os
, const Symbol_table
* symtab
,
2189 The_target_aarch64
* target
)
2191 if (shdr
.get_sh_size() == 0
2192 || (shdr
.get_sh_flags() &
2193 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2194 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2197 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2199 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2200 AArch64_address output_address
;
2201 if (output_offset
!= invalid_address
)
2202 output_address
= os
->address() + output_offset
;
2205 const Output_relaxed_input_section
* poris
=
2206 os
->find_relaxed_input_section(this, shndx
);
2208 output_address
= poris
->address();
2211 section_size_type input_view_size
= 0;
2212 const unsigned char* input_view
=
2213 this->section_contents(shndx
, &input_view_size
, false);
2215 Mapping_symbol_position
section_start(shndx
, 0);
2216 // Find the first mapping symbol record within section shndx.
2217 typename
Mapping_symbol_info::const_iterator p
=
2218 this->mapping_symbol_info_
.lower_bound(section_start
);
2219 while (p
!= this->mapping_symbol_info_
.end() &&
2220 p
->first
.shndx_
== shndx
)
2222 typename
Mapping_symbol_info::const_iterator prev
= p
;
2224 if (prev
->second
== 'x')
2226 section_size_type span_start
=
2227 convert_to_section_size_type(prev
->first
.offset_
);
2228 section_size_type span_end
;
2229 if (p
!= this->mapping_symbol_info_
.end()
2230 && p
->first
.shndx_
== shndx
)
2231 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2233 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2235 // Here we do not share the scanning code of both errata. For 843419,
2236 // only the last few insns of each page are examined, which is fast,
2237 // whereas, for 835769, every insn pair needs to be checked.
2239 if (parameters
->options().fix_cortex_a53_843419())
2240 target
->scan_erratum_843419_span(
2241 this, shndx
, span_start
, span_end
,
2242 const_cast<unsigned char*>(input_view
), output_address
);
2244 if (parameters
->options().fix_cortex_a53_835769())
2245 target
->scan_erratum_835769_span(
2246 this, shndx
, span_start
, span_end
,
2247 const_cast<unsigned char*>(input_view
), output_address
);
2253 // Scan relocations for stub generation.
2255 template<int size
, bool big_endian
>
2257 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2258 The_target_aarch64
* target
,
2259 const Symbol_table
* symtab
,
2260 const Layout
* layout
)
2262 unsigned int shnum
= this->shnum();
2263 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2265 // Read the section headers.
2266 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2270 // To speed up processing, we set up hash tables for fast lookup of
2271 // input offsets to output addresses.
2272 this->initialize_input_to_output_maps();
2274 const Relobj::Output_sections
& out_sections(this->output_sections());
2276 Relocate_info
<size
, big_endian
> relinfo
;
2277 relinfo
.symtab
= symtab
;
2278 relinfo
.layout
= layout
;
2279 relinfo
.object
= this;
2281 // Do relocation stubs scanning.
2282 const unsigned char* p
= pshdrs
+ shdr_size
;
2283 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2285 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2286 if (parameters
->options().fix_cortex_a53_843419()
2287 || parameters
->options().fix_cortex_a53_835769())
2288 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2289 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2292 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2293 AArch64_address output_offset
=
2294 this->get_output_section_offset(index
);
2295 AArch64_address output_address
;
2296 if (output_offset
!= invalid_address
)
2298 output_address
= out_sections
[index
]->address() + output_offset
;
2302 // Currently this only happens for a relaxed section.
2303 const Output_relaxed_input_section
* poris
=
2304 out_sections
[index
]->find_relaxed_input_section(this, index
);
2305 gold_assert(poris
!= NULL
);
2306 output_address
= poris
->address();
2309 // Get the relocations.
2310 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2314 // Get the section contents.
2315 section_size_type input_view_size
= 0;
2316 const unsigned char* input_view
=
2317 this->section_contents(index
, &input_view_size
, false);
2319 relinfo
.reloc_shndx
= i
;
2320 relinfo
.data_shndx
= index
;
2321 unsigned int sh_type
= shdr
.get_sh_type();
2322 unsigned int reloc_size
;
2323 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2324 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2326 Output_section
* os
= out_sections
[index
];
2327 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2328 shdr
.get_sh_size() / reloc_size
,
2330 output_offset
== invalid_address
,
2331 input_view
, output_address
,
2338 // A class to wrap an ordinary input section containing executable code.
2340 template<int size
, bool big_endian
>
2341 class AArch64_input_section
: public Output_relaxed_input_section
2344 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2346 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2347 : Output_relaxed_input_section(relobj
, shndx
, 1),
2349 original_contents_(NULL
), original_size_(0),
2350 original_addralign_(1)
2353 ~AArch64_input_section()
2354 { delete[] this->original_contents_
; }
2360 // Set the stub_table.
2362 set_stub_table(The_stub_table
* st
)
2363 { this->stub_table_
= st
; }
2365 // Whether this is a stub table owner.
2367 is_stub_table_owner() const
2368 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2370 // Return the original size of the section.
2372 original_size() const
2373 { return this->original_size_
; }
2375 // Return the stub table.
2378 { return stub_table_
; }
2381 // Write out this input section.
2383 do_write(Output_file
*);
2385 // Return required alignment of this.
2387 do_addralign() const
2389 if (this->is_stub_table_owner())
2390 return std::max(this->stub_table_
->addralign(),
2391 static_cast<uint64_t>(this->original_addralign_
));
2393 return this->original_addralign_
;
2396 // Finalize data size.
2398 set_final_data_size();
2400 // Reset address and file offset.
2402 do_reset_address_and_file_offset();
2406 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2407 section_offset_type offset
,
2408 section_offset_type
* poutput
) const
2410 if ((object
== this->relobj())
2411 && (shndx
== this->shndx())
2414 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2424 // Copying is not allowed.
2425 AArch64_input_section(const AArch64_input_section
&);
2426 AArch64_input_section
& operator=(const AArch64_input_section
&);
2428 // The relocation stubs.
2429 The_stub_table
* stub_table_
;
2430 // Original section contents. We have to make a copy here since the file
2431 // containing the original section may not be locked when we need to access
2433 unsigned char* original_contents_
;
2434 // Section size of the original input section.
2435 uint32_t original_size_
;
2436 // Address alignment of the original input section.
2437 uint32_t original_addralign_
;
2438 }; // End of AArch64_input_section
2441 // Finalize data size.
2443 template<int size
, bool big_endian
>
2445 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2447 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2449 if (this->is_stub_table_owner())
2451 this->stub_table_
->finalize_data_size();
2452 off
= align_address(off
, this->stub_table_
->addralign());
2453 off
+= this->stub_table_
->data_size();
2455 this->set_data_size(off
);
2459 // Reset address and file offset.
2461 template<int size
, bool big_endian
>
2463 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2465 // Size of the original input section contents.
2466 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2468 // If this is a stub table owner, account for the stub table size.
2469 if (this->is_stub_table_owner())
2471 The_stub_table
* stub_table
= this->stub_table_
;
2473 // Reset the stub table's address and file offset. The
2474 // current data size for child will be updated after that.
2475 stub_table_
->reset_address_and_file_offset();
2476 off
= align_address(off
, stub_table_
->addralign());
2477 off
+= stub_table
->current_data_size();
2480 this->set_current_data_size(off
);
2484 // Initialize an Arm_input_section.
2486 template<int size
, bool big_endian
>
2488 AArch64_input_section
<size
, big_endian
>::init()
2490 Relobj
* relobj
= this->relobj();
2491 unsigned int shndx
= this->shndx();
2493 // We have to cache original size, alignment and contents to avoid locking
2494 // the original file.
2495 this->original_addralign_
=
2496 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2498 // This is not efficient but we expect only a small number of relaxed
2499 // input sections for stubs.
2500 section_size_type section_size
;
2501 const unsigned char* section_contents
=
2502 relobj
->section_contents(shndx
, §ion_size
, false);
2503 this->original_size_
=
2504 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2506 gold_assert(this->original_contents_
== NULL
);
2507 this->original_contents_
= new unsigned char[section_size
];
2508 memcpy(this->original_contents_
, section_contents
, section_size
);
2510 // We want to make this look like the original input section after
2511 // output sections are finalized.
2512 Output_section
* os
= relobj
->output_section(shndx
);
2513 off_t offset
= relobj
->output_section_offset(shndx
);
2514 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2515 this->set_address(os
->address() + offset
);
2516 this->set_file_offset(os
->offset() + offset
);
2517 this->set_current_data_size(this->original_size_
);
2518 this->finalize_data_size();
2522 // Write data to output file.
2524 template<int size
, bool big_endian
>
2526 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2528 // We have to write out the original section content.
2529 gold_assert(this->original_contents_
!= NULL
);
2530 of
->write(this->offset(), this->original_contents_
,
2531 this->original_size_
);
2533 // If this owns a stub table and it is not empty, write it.
2534 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2535 this->stub_table_
->write(of
);
2539 // Arm output section class. This is defined mainly to add a number of stub
2540 // generation methods.
2542 template<int size
, bool big_endian
>
2543 class AArch64_output_section
: public Output_section
2546 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2547 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2548 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2549 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2552 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2553 elfcpp::Elf_Xword flags
)
2554 : Output_section(name
, type
, flags
)
2557 ~AArch64_output_section() {}
2559 // Group input sections for stub generation.
2561 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2565 typedef Output_section::Input_section Input_section
;
2566 typedef Output_section::Input_section_list Input_section_list
;
2568 // Create a stub group.
2570 create_stub_group(Input_section_list::const_iterator
,
2571 Input_section_list::const_iterator
,
2572 Input_section_list::const_iterator
,
2573 The_target_aarch64
*,
2574 std::vector
<Output_relaxed_input_section
*>&,
2576 }; // End of AArch64_output_section
2579 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2580 // the input section that will be the owner of the stub table.
2582 template<int size
, bool big_endian
> void
2583 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2584 Input_section_list::const_iterator first
,
2585 Input_section_list::const_iterator last
,
2586 Input_section_list::const_iterator owner
,
2587 The_target_aarch64
* target
,
2588 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2591 // Currently we convert ordinary input sections into relaxed sections only
2593 The_aarch64_input_section
* input_section
;
2594 if (owner
->is_relaxed_input_section())
2598 gold_assert(owner
->is_input_section());
2599 // Create a new relaxed input section. We need to lock the original
2601 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2603 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2604 new_relaxed_sections
.push_back(input_section
);
2607 // Create a stub table.
2608 The_stub_table
* stub_table
=
2609 target
->new_stub_table(input_section
);
2611 input_section
->set_stub_table(stub_table
);
2613 Input_section_list::const_iterator p
= first
;
2614 // Look for input sections or relaxed input sections in [first ... last].
2617 if (p
->is_input_section() || p
->is_relaxed_input_section())
2619 // The stub table information for input sections live
2620 // in their objects.
2621 The_aarch64_relobj
* aarch64_relobj
=
2622 static_cast<The_aarch64_relobj
*>(p
->relobj());
2623 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2626 while (p
++ != last
);
2630 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2631 // stub groups. We grow a stub group by adding input section until the size is
2632 // just below GROUP_SIZE. The last input section will be converted into a stub
2633 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2634 // after the stub table, effectively doubling the group size.
2636 // This is similar to the group_sections() function in elf32-arm.c but is
2637 // implemented differently.
2639 template<int size
, bool big_endian
>
2640 void AArch64_output_section
<size
, big_endian
>::group_sections(
2641 section_size_type group_size
,
2642 bool stubs_always_after_branch
,
2643 Target_aarch64
<size
, big_endian
>* target
,
2649 FINDING_STUB_SECTION
,
2653 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2655 State state
= NO_GROUP
;
2656 section_size_type off
= 0;
2657 section_size_type group_begin_offset
= 0;
2658 section_size_type group_end_offset
= 0;
2659 section_size_type stub_table_end_offset
= 0;
2660 Input_section_list::const_iterator group_begin
=
2661 this->input_sections().end();
2662 Input_section_list::const_iterator stub_table
=
2663 this->input_sections().end();
2664 Input_section_list::const_iterator group_end
= this->input_sections().end();
2665 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2666 p
!= this->input_sections().end();
2669 section_size_type section_begin_offset
=
2670 align_address(off
, p
->addralign());
2671 section_size_type section_end_offset
=
2672 section_begin_offset
+ p
->data_size();
2674 // Check to see if we should group the previously seen sections.
2680 case FINDING_STUB_SECTION
:
2681 // Adding this section makes the group larger than GROUP_SIZE.
2682 if (section_end_offset
- group_begin_offset
>= group_size
)
2684 if (stubs_always_after_branch
)
2686 gold_assert(group_end
!= this->input_sections().end());
2687 this->create_stub_group(group_begin
, group_end
, group_end
,
2688 target
, new_relaxed_sections
,
2694 // Input sections up to stub_group_size bytes after the stub
2695 // table can be handled by it too.
2696 state
= HAS_STUB_SECTION
;
2697 stub_table
= group_end
;
2698 stub_table_end_offset
= group_end_offset
;
2703 case HAS_STUB_SECTION
:
2704 // Adding this section makes the post stub-section group larger
2707 // NOT SUPPORTED YET. For completeness only.
2708 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2710 gold_assert(group_end
!= this->input_sections().end());
2711 this->create_stub_group(group_begin
, group_end
, stub_table
,
2712 target
, new_relaxed_sections
, task
);
2721 // If we see an input section and currently there is no group, start
2722 // a new one. Skip any empty sections. We look at the data size
2723 // instead of calling p->relobj()->section_size() to avoid locking.
2724 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2725 && (p
->data_size() != 0))
2727 if (state
== NO_GROUP
)
2729 state
= FINDING_STUB_SECTION
;
2731 group_begin_offset
= section_begin_offset
;
2734 // Keep track of the last input section seen.
2736 group_end_offset
= section_end_offset
;
2739 off
= section_end_offset
;
2742 // Create a stub group for any ungrouped sections.
2743 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2745 gold_assert(group_end
!= this->input_sections().end());
2746 this->create_stub_group(group_begin
, group_end
,
2747 (state
== FINDING_STUB_SECTION
2750 target
, new_relaxed_sections
, task
);
2753 if (!new_relaxed_sections
.empty())
2754 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2756 // Update the section offsets
2757 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2759 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2760 new_relaxed_sections
[i
]->relobj());
2761 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2762 // Tell AArch64_relobj that this input section is converted.
2763 relobj
->convert_input_section_to_relaxed_section(shndx
);
2765 } // End of AArch64_output_section::group_sections
2768 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2771 // The aarch64 target class.
2773 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2774 template<int size
, bool big_endian
>
2775 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2778 typedef Target_aarch64
<size
, big_endian
> This
;
2779 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2781 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2782 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2783 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2784 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2785 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2786 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2787 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2788 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2789 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2790 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2791 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2792 typedef Unordered_map
<Section_id
,
2793 AArch64_input_section
<size
, big_endian
>*,
2794 Section_id_hash
> AArch64_input_section_map
;
2795 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2796 const static int TCB_SIZE
= size
/ 8 * 2;
2798 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2799 : Sized_target
<size
, big_endian
>(info
),
2800 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2801 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2802 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2803 got_mod_index_offset_(-1U),
2804 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2805 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2808 // Scan the relocations to determine unreferenced sections for
2809 // garbage collection.
2811 gc_process_relocs(Symbol_table
* symtab
,
2813 Sized_relobj_file
<size
, big_endian
>* object
,
2814 unsigned int data_shndx
,
2815 unsigned int sh_type
,
2816 const unsigned char* prelocs
,
2818 Output_section
* output_section
,
2819 bool needs_special_offset_handling
,
2820 size_t local_symbol_count
,
2821 const unsigned char* plocal_symbols
);
2823 // Scan the relocations to look for symbol adjustments.
2825 scan_relocs(Symbol_table
* symtab
,
2827 Sized_relobj_file
<size
, big_endian
>* object
,
2828 unsigned int data_shndx
,
2829 unsigned int sh_type
,
2830 const unsigned char* prelocs
,
2832 Output_section
* output_section
,
2833 bool needs_special_offset_handling
,
2834 size_t local_symbol_count
,
2835 const unsigned char* plocal_symbols
);
2837 // Finalize the sections.
2839 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2841 // Return the value to use for a dynamic which requires special
2844 do_dynsym_value(const Symbol
*) const;
2846 // Relocate a section.
2848 relocate_section(const Relocate_info
<size
, big_endian
>*,
2849 unsigned int sh_type
,
2850 const unsigned char* prelocs
,
2852 Output_section
* output_section
,
2853 bool needs_special_offset_handling
,
2854 unsigned char* view
,
2855 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2856 section_size_type view_size
,
2857 const Reloc_symbol_changes
*);
2859 // Scan the relocs during a relocatable link.
2861 scan_relocatable_relocs(Symbol_table
* symtab
,
2863 Sized_relobj_file
<size
, big_endian
>* object
,
2864 unsigned int data_shndx
,
2865 unsigned int sh_type
,
2866 const unsigned char* prelocs
,
2868 Output_section
* output_section
,
2869 bool needs_special_offset_handling
,
2870 size_t local_symbol_count
,
2871 const unsigned char* plocal_symbols
,
2872 Relocatable_relocs
*);
2874 // Scan the relocs for --emit-relocs.
2876 emit_relocs_scan(Symbol_table
* symtab
,
2878 Sized_relobj_file
<size
, big_endian
>* object
,
2879 unsigned int data_shndx
,
2880 unsigned int sh_type
,
2881 const unsigned char* prelocs
,
2883 Output_section
* output_section
,
2884 bool needs_special_offset_handling
,
2885 size_t local_symbol_count
,
2886 const unsigned char* plocal_syms
,
2887 Relocatable_relocs
* rr
);
2889 // Relocate a section during a relocatable link.
2892 const Relocate_info
<size
, big_endian
>*,
2893 unsigned int sh_type
,
2894 const unsigned char* prelocs
,
2896 Output_section
* output_section
,
2897 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
2898 unsigned char* view
,
2899 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2900 section_size_type view_size
,
2901 unsigned char* reloc_view
,
2902 section_size_type reloc_view_size
);
2904 // Return the symbol index to use for a target specific relocation.
2905 // The only target specific relocation is R_AARCH64_TLSDESC for a
2906 // local symbol, which is an absolute reloc.
2908 do_reloc_symbol_index(void*, unsigned int r_type
) const
2910 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
2914 // Return the addend to use for a target specific relocation.
2916 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
2918 // Return the PLT section.
2920 do_plt_address_for_global(const Symbol
* gsym
) const
2921 { return this->plt_section()->address_for_global(gsym
); }
2924 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
2925 { return this->plt_section()->address_for_local(relobj
, symndx
); }
2927 // This function should be defined in targets that can use relocation
2928 // types to determine (implemented in local_reloc_may_be_function_pointer
2929 // and global_reloc_may_be_function_pointer)
2930 // if a function's pointer is taken. ICF uses this in safe mode to only
2931 // fold those functions whose pointer is defintely not taken.
2933 do_can_check_for_function_pointers() const
2936 // Return the number of entries in the PLT.
2938 plt_entry_count() const;
2940 //Return the offset of the first non-reserved PLT entry.
2942 first_plt_entry_offset() const;
2944 // Return the size of each PLT entry.
2946 plt_entry_size() const;
2948 // Create a stub table.
2950 new_stub_table(The_aarch64_input_section
*);
2952 // Create an aarch64 input section.
2953 The_aarch64_input_section
*
2954 new_aarch64_input_section(Relobj
*, unsigned int);
2956 // Find an aarch64 input section instance for a given OBJ and SHNDX.
2957 The_aarch64_input_section
*
2958 find_aarch64_input_section(Relobj
*, unsigned int) const;
2960 // Return the thread control block size.
2962 tcb_size() const { return This::TCB_SIZE
; }
2964 // Scan a section for stub generation.
2966 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
2967 const unsigned char*, size_t, Output_section
*,
2968 bool, const unsigned char*,
2972 // Scan a relocation section for stub.
2973 template<int sh_type
>
2975 scan_reloc_section_for_stubs(
2976 const The_relocate_info
* relinfo
,
2977 const unsigned char* prelocs
,
2979 Output_section
* output_section
,
2980 bool needs_special_offset_handling
,
2981 const unsigned char* view
,
2982 Address view_address
,
2985 // Relocate a single stub.
2987 relocate_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
2988 Output_section
*, unsigned char*, Address
,
2991 // Get the default AArch64 target.
2995 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
2996 && parameters
->target().get_size() == size
2997 && parameters
->target().is_big_endian() == big_endian
);
2998 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
3002 // Scan erratum 843419 for a part of a section.
3004 scan_erratum_843419_span(
3005 AArch64_relobj
<size
, big_endian
>*,
3007 const section_size_type
,
3008 const section_size_type
,
3012 // Scan erratum 835769 for a part of a section.
3014 scan_erratum_835769_span(
3015 AArch64_relobj
<size
, big_endian
>*,
3017 const section_size_type
,
3018 const section_size_type
,
3024 do_select_as_default_target()
3026 gold_assert(aarch64_reloc_property_table
== NULL
);
3027 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
3030 // Add a new reloc argument, returning the index in the vector.
3032 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
3035 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
3036 return this->tlsdesc_reloc_info_
.size() - 1;
3039 virtual Output_data_plt_aarch64
<size
, big_endian
>*
3040 do_make_data_plt(Layout
* layout
,
3041 Output_data_got_aarch64
<size
, big_endian
>* got
,
3042 Output_data_space
* got_plt
,
3043 Output_data_space
* got_irelative
)
3045 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
3046 layout
, got
, got_plt
, got_irelative
);
3050 // do_make_elf_object to override the same function in the base class.
3052 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
3053 const elfcpp::Ehdr
<size
, big_endian
>&);
3055 Output_data_plt_aarch64
<size
, big_endian
>*
3056 make_data_plt(Layout
* layout
,
3057 Output_data_got_aarch64
<size
, big_endian
>* got
,
3058 Output_data_space
* got_plt
,
3059 Output_data_space
* got_irelative
)
3061 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
3064 // We only need to generate stubs, and hence perform relaxation if we are
3065 // not doing relocatable linking.
3067 do_may_relax() const
3068 { return !parameters
->options().relocatable(); }
3070 // Relaxation hook. This is where we do stub generation.
3072 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
3075 group_sections(Layout
* layout
,
3076 section_size_type group_size
,
3077 bool stubs_always_after_branch
,
3081 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
3082 const Sized_symbol
<size
>*, unsigned int,
3083 const Symbol_value
<size
>*,
3084 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
3087 // Make an output section.
3089 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
3090 elfcpp::Elf_Xword flags
)
3091 { return new The_aarch64_output_section(name
, type
, flags
); }
3094 // The class which scans relocations.
3099 : issued_non_pic_error_(false)
3103 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3104 Sized_relobj_file
<size
, big_endian
>* object
,
3105 unsigned int data_shndx
,
3106 Output_section
* output_section
,
3107 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3108 const elfcpp::Sym
<size
, big_endian
>& lsym
,
3112 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3113 Sized_relobj_file
<size
, big_endian
>* object
,
3114 unsigned int data_shndx
,
3115 Output_section
* output_section
,
3116 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3120 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3121 Target_aarch64
<size
, big_endian
>* ,
3122 Sized_relobj_file
<size
, big_endian
>* ,
3125 const elfcpp::Rela
<size
, big_endian
>& ,
3126 unsigned int r_type
,
3127 const elfcpp::Sym
<size
, big_endian
>&);
3130 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3131 Target_aarch64
<size
, big_endian
>* ,
3132 Sized_relobj_file
<size
, big_endian
>* ,
3135 const elfcpp::Rela
<size
, big_endian
>& ,
3136 unsigned int r_type
,
3141 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3142 unsigned int r_type
);
3145 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3146 unsigned int r_type
, Symbol
*);
3149 possible_function_pointer_reloc(unsigned int r_type
);
3152 check_non_pic(Relobj
*, unsigned int r_type
);
3155 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3156 unsigned int r_type
);
3158 // Whether we have issued an error about a non-PIC compilation.
3159 bool issued_non_pic_error_
;
3162 // The class which implements relocation.
3167 : skip_call_tls_get_addr_(false)
3173 // Do a relocation. Return false if the caller should not issue
3174 // any warnings about this relocation.
3176 relocate(const Relocate_info
<size
, big_endian
>*, unsigned int,
3177 Target_aarch64
*, Output_section
*, size_t, const unsigned char*,
3178 const Sized_symbol
<size
>*, const Symbol_value
<size
>*,
3179 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3183 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3184 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3185 Target_aarch64
<size
, big_endian
>*,
3187 const elfcpp::Rela
<size
, big_endian
>&,
3188 unsigned int r_type
, const Sized_symbol
<size
>*,
3189 const Symbol_value
<size
>*,
3191 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3193 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3195 const Relocate_info
<size
, big_endian
>*,
3196 Target_aarch64
<size
, big_endian
>*,
3197 const elfcpp::Rela
<size
, big_endian
>&,
3200 const Symbol_value
<size
>*);
3202 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3204 const Relocate_info
<size
, big_endian
>*,
3205 Target_aarch64
<size
, big_endian
>*,
3206 const elfcpp::Rela
<size
, big_endian
>&,
3209 const Symbol_value
<size
>*);
3211 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3213 const Relocate_info
<size
, big_endian
>*,
3214 Target_aarch64
<size
, big_endian
>*,
3215 const elfcpp::Rela
<size
, big_endian
>&,
3218 const Symbol_value
<size
>*);
3220 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3222 const Relocate_info
<size
, big_endian
>*,
3223 Target_aarch64
<size
, big_endian
>*,
3224 const elfcpp::Rela
<size
, big_endian
>&,
3227 const Symbol_value
<size
>*);
3229 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3231 const Relocate_info
<size
, big_endian
>*,
3232 Target_aarch64
<size
, big_endian
>*,
3233 const elfcpp::Rela
<size
, big_endian
>&,
3236 const Symbol_value
<size
>*,
3237 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3238 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3240 bool skip_call_tls_get_addr_
;
3242 }; // End of class Relocate
3244 // Adjust TLS relocation type based on the options and whether this
3245 // is a local symbol.
3246 static tls::Tls_optimization
3247 optimize_tls_reloc(bool is_final
, int r_type
);
3249 // Get the GOT section, creating it if necessary.
3250 Output_data_got_aarch64
<size
, big_endian
>*
3251 got_section(Symbol_table
*, Layout
*);
3253 // Get the GOT PLT section.
3255 got_plt_section() const
3257 gold_assert(this->got_plt_
!= NULL
);
3258 return this->got_plt_
;
3261 // Get the GOT section for TLSDESC entries.
3262 Output_data_got
<size
, big_endian
>*
3263 got_tlsdesc_section() const
3265 gold_assert(this->got_tlsdesc_
!= NULL
);
3266 return this->got_tlsdesc_
;
3269 // Create the PLT section.
3271 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3273 // Create a PLT entry for a global symbol.
3275 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3277 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3279 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3280 Sized_relobj_file
<size
, big_endian
>* relobj
,
3281 unsigned int local_sym_index
);
3283 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3285 define_tls_base_symbol(Symbol_table
*, Layout
*);
3287 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3289 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3291 // Create a GOT entry for the TLS module index.
3293 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3294 Sized_relobj_file
<size
, big_endian
>* object
);
3296 // Get the PLT section.
3297 Output_data_plt_aarch64
<size
, big_endian
>*
3300 gold_assert(this->plt_
!= NULL
);
3304 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3305 // ST_E_843419, we need an additional field for adrp offset.
3306 void create_erratum_stub(
3307 AArch64_relobj
<size
, big_endian
>* relobj
,
3309 section_size_type erratum_insn_offset
,
3310 Address erratum_address
,
3311 typename
Insn_utilities::Insntype erratum_insn
,
3313 unsigned int e843419_adrp_offset
=0);
3315 // Return whether this is a 3-insn erratum sequence.
3316 bool is_erratum_843419_sequence(
3317 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3318 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3319 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3321 // Return whether this is a 835769 sequence.
3322 // (Similarly implemented as in elfnn-aarch64.c.)
3323 bool is_erratum_835769_sequence(
3324 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3325 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3327 // Get the dynamic reloc section, creating it if necessary.
3329 rela_dyn_section(Layout
*);
3331 // Get the section to use for TLSDESC relocations.
3333 rela_tlsdesc_section(Layout
*) const;
3335 // Get the section to use for IRELATIVE relocations.
3337 rela_irelative_section(Layout
*);
3339 // Add a potential copy relocation.
3341 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3342 Sized_relobj_file
<size
, big_endian
>* object
,
3343 unsigned int shndx
, Output_section
* output_section
,
3344 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3346 unsigned int r_type
= elfcpp::elf_r_type
<size
>(reloc
.get_r_info());
3347 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3348 symtab
->get_sized_symbol
<size
>(sym
),
3349 object
, shndx
, output_section
,
3350 r_type
, reloc
.get_r_offset(),
3351 reloc
.get_r_addend(),
3352 this->rela_dyn_section(layout
));
3355 // Information about this specific target which we pass to the
3356 // general Target structure.
3357 static const Target::Target_info aarch64_info
;
3359 // The types of GOT entries needed for this platform.
3360 // These values are exposed to the ABI in an incremental link.
3361 // Do not renumber existing values without changing the version
3362 // number of the .gnu_incremental_inputs section.
3365 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3366 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3367 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3368 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3371 // This type is used as the argument to the target specific
3372 // relocation routines. The only target specific reloc is
3373 // R_AARCh64_TLSDESC against a local symbol.
3376 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3377 unsigned int a_r_sym
)
3378 : object(a_object
), r_sym(a_r_sym
)
3381 // The object in which the local symbol is defined.
3382 Sized_relobj_file
<size
, big_endian
>* object
;
3383 // The local symbol index in the object.
3388 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3390 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3391 // The GOT PLT section.
3392 Output_data_space
* got_plt_
;
3393 // The GOT section for IRELATIVE relocations.
3394 Output_data_space
* got_irelative_
;
3395 // The GOT section for TLSDESC relocations.
3396 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3397 // The _GLOBAL_OFFSET_TABLE_ symbol.
3398 Symbol
* global_offset_table_
;
3399 // The dynamic reloc section.
3400 Reloc_section
* rela_dyn_
;
3401 // The section to use for IRELATIVE relocs.
3402 Reloc_section
* rela_irelative_
;
3403 // Relocs saved to avoid a COPY reloc.
3404 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3405 // Offset of the GOT entry for the TLS module index.
3406 unsigned int got_mod_index_offset_
;
3407 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3408 // specific relocation. Here we store the object and local symbol
3409 // index for the relocation.
3410 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3411 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3412 bool tls_base_symbol_defined_
;
3413 // List of stub_tables
3414 Stub_table_list stub_tables_
;
3415 // Actual stub group size
3416 section_size_type stub_group_size_
;
3417 AArch64_input_section_map aarch64_input_section_map_
;
3418 }; // End of Target_aarch64
3422 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3425 false, // is_big_endian
3426 elfcpp::EM_AARCH64
, // machine_code
3427 false, // has_make_symbol
3428 false, // has_resolve
3429 false, // has_code_fill
3430 true, // is_default_stack_executable
3431 true, // can_icf_inline_merge_sections
3433 "/lib/ld.so.1", // program interpreter
3434 0x400000, // default_text_segment_address
3435 0x10000, // abi_pagesize (overridable by -z max-page-size)
3436 0x1000, // common_pagesize (overridable by -z common-page-size)
3437 false, // isolate_execinstr
3439 elfcpp::SHN_UNDEF
, // small_common_shndx
3440 elfcpp::SHN_UNDEF
, // large_common_shndx
3441 0, // small_common_section_flags
3442 0, // large_common_section_flags
3443 NULL
, // attributes_section
3444 NULL
, // attributes_vendor
3445 "_start", // entry_symbol_name
3446 32, // hash_entry_size
3450 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3453 false, // is_big_endian
3454 elfcpp::EM_AARCH64
, // machine_code
3455 false, // has_make_symbol
3456 false, // has_resolve
3457 false, // has_code_fill
3458 true, // is_default_stack_executable
3459 false, // can_icf_inline_merge_sections
3461 "/lib/ld.so.1", // program interpreter
3462 0x400000, // default_text_segment_address
3463 0x10000, // abi_pagesize (overridable by -z max-page-size)
3464 0x1000, // common_pagesize (overridable by -z common-page-size)
3465 false, // isolate_execinstr
3467 elfcpp::SHN_UNDEF
, // small_common_shndx
3468 elfcpp::SHN_UNDEF
, // large_common_shndx
3469 0, // small_common_section_flags
3470 0, // large_common_section_flags
3471 NULL
, // attributes_section
3472 NULL
, // attributes_vendor
3473 "_start", // entry_symbol_name
3474 32, // hash_entry_size
3478 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3481 true, // is_big_endian
3482 elfcpp::EM_AARCH64
, // machine_code
3483 false, // has_make_symbol
3484 false, // has_resolve
3485 false, // has_code_fill
3486 true, // is_default_stack_executable
3487 true, // can_icf_inline_merge_sections
3489 "/lib/ld.so.1", // program interpreter
3490 0x400000, // default_text_segment_address
3491 0x10000, // abi_pagesize (overridable by -z max-page-size)
3492 0x1000, // common_pagesize (overridable by -z common-page-size)
3493 false, // isolate_execinstr
3495 elfcpp::SHN_UNDEF
, // small_common_shndx
3496 elfcpp::SHN_UNDEF
, // large_common_shndx
3497 0, // small_common_section_flags
3498 0, // large_common_section_flags
3499 NULL
, // attributes_section
3500 NULL
, // attributes_vendor
3501 "_start", // entry_symbol_name
3502 32, // hash_entry_size
3506 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3509 true, // is_big_endian
3510 elfcpp::EM_AARCH64
, // machine_code
3511 false, // has_make_symbol
3512 false, // has_resolve
3513 false, // has_code_fill
3514 true, // is_default_stack_executable
3515 false, // can_icf_inline_merge_sections
3517 "/lib/ld.so.1", // program interpreter
3518 0x400000, // default_text_segment_address
3519 0x10000, // abi_pagesize (overridable by -z max-page-size)
3520 0x1000, // common_pagesize (overridable by -z common-page-size)
3521 false, // isolate_execinstr
3523 elfcpp::SHN_UNDEF
, // small_common_shndx
3524 elfcpp::SHN_UNDEF
, // large_common_shndx
3525 0, // small_common_section_flags
3526 0, // large_common_section_flags
3527 NULL
, // attributes_section
3528 NULL
, // attributes_vendor
3529 "_start", // entry_symbol_name
3530 32, // hash_entry_size
3533 // Get the GOT section, creating it if necessary.
3535 template<int size
, bool big_endian
>
3536 Output_data_got_aarch64
<size
, big_endian
>*
3537 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3540 if (this->got_
== NULL
)
3542 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3544 // When using -z now, we can treat .got.plt as a relro section.
3545 // Without -z now, it is modified after program startup by lazy
3547 bool is_got_plt_relro
= parameters
->options().now();
3548 Output_section_order got_order
= (is_got_plt_relro
3550 : ORDER_RELRO_LAST
);
3551 Output_section_order got_plt_order
= (is_got_plt_relro
3553 : ORDER_NON_RELRO_FIRST
);
3555 // Layout of .got and .got.plt sections.
3556 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3558 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3559 // .gotplt[1] reserved for ld.so (resolver)
3560 // .gotplt[2] reserved
3562 // Generate .got section.
3563 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3565 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3566 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3567 this->got_
, got_order
, true);
3568 // The first word of GOT is reserved for the address of .dynamic.
3569 // We put 0 here now. The value will be replaced later in
3570 // Output_data_got_aarch64::do_write.
3571 this->got_
->add_constant(0);
3573 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3574 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3575 // even if there is a .got.plt section.
3576 this->global_offset_table_
=
3577 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3578 Symbol_table::PREDEFINED
,
3580 0, 0, elfcpp::STT_OBJECT
,
3582 elfcpp::STV_HIDDEN
, 0,
3585 // Generate .got.plt section.
3586 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3587 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3589 | elfcpp::SHF_WRITE
),
3590 this->got_plt_
, got_plt_order
,
3593 // The first three entries are reserved.
3594 this->got_plt_
->set_current_data_size(
3595 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3597 // If there are any IRELATIVE relocations, they get GOT entries
3598 // in .got.plt after the jump slot entries.
3599 this->got_irelative_
= new Output_data_space(size
/ 8,
3600 "** GOT IRELATIVE PLT");
3601 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3603 | elfcpp::SHF_WRITE
),
3604 this->got_irelative_
,
3608 // If there are any TLSDESC relocations, they get GOT entries in
3609 // .got.plt after the jump slot and IRELATIVE entries.
3610 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3611 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3613 | elfcpp::SHF_WRITE
),
3618 if (!is_got_plt_relro
)
3620 // Those bytes can go into the relro segment.
3621 layout
->increase_relro(
3622 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3629 // Get the dynamic reloc section, creating it if necessary.
3631 template<int size
, bool big_endian
>
3632 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3633 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3635 if (this->rela_dyn_
== NULL
)
3637 gold_assert(layout
!= NULL
);
3638 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3639 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3640 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3641 ORDER_DYNAMIC_RELOCS
, false);
3643 return this->rela_dyn_
;
3646 // Get the section to use for IRELATIVE relocs, creating it if
3647 // necessary. These go in .rela.dyn, but only after all other dynamic
3648 // relocations. They need to follow the other dynamic relocations so
3649 // that they can refer to global variables initialized by those
3652 template<int size
, bool big_endian
>
3653 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3654 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3656 if (this->rela_irelative_
== NULL
)
3658 // Make sure we have already created the dynamic reloc section.
3659 this->rela_dyn_section(layout
);
3660 this->rela_irelative_
= new Reloc_section(false);
3661 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3662 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3663 ORDER_DYNAMIC_RELOCS
, false);
3664 gold_assert(this->rela_dyn_
->output_section()
3665 == this->rela_irelative_
->output_section());
3667 return this->rela_irelative_
;
3671 // do_make_elf_object to override the same function in the base class. We need
3672 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3673 // store backend specific information. Hence we need to have our own ELF object
3676 template<int size
, bool big_endian
>
3678 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3679 const std::string
& name
,
3680 Input_file
* input_file
,
3681 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3683 int et
= ehdr
.get_e_type();
3684 // ET_EXEC files are valid input for --just-symbols/-R,
3685 // and we treat them as relocatable objects.
3686 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3687 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3688 name
, input_file
, offset
, ehdr
);
3689 else if (et
== elfcpp::ET_REL
)
3691 AArch64_relobj
<size
, big_endian
>* obj
=
3692 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3696 else if (et
== elfcpp::ET_DYN
)
3698 // Keep base implementation.
3699 Sized_dynobj
<size
, big_endian
>* obj
=
3700 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3706 gold_error(_("%s: unsupported ELF file type %d"),
3713 // Scan a relocation for stub generation.
3715 template<int size
, bool big_endian
>
3717 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3718 const Relocate_info
<size
, big_endian
>* relinfo
,
3719 unsigned int r_type
,
3720 const Sized_symbol
<size
>* gsym
,
3722 const Symbol_value
<size
>* psymval
,
3723 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3726 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3727 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3729 Symbol_value
<size
> symval
;
3732 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3733 get_reloc_property(r_type
);
3734 if (gsym
->use_plt_offset(arp
->reference_flags()))
3736 // This uses a PLT, change the symbol value.
3737 symval
.set_output_value(this->plt_section()->address()
3738 + gsym
->plt_offset());
3741 else if (gsym
->is_undefined())
3742 // There is no need to generate a stub symbol is undefined.
3746 // Get the symbol value.
3747 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3749 // Owing to pipelining, the PC relative branches below actually skip
3750 // two instructions when the branch offset is 0.
3751 Address destination
= static_cast<Address
>(-1);
3754 case elfcpp::R_AARCH64_CALL26
:
3755 case elfcpp::R_AARCH64_JUMP26
:
3756 destination
= value
+ addend
;
3762 int stub_type
= The_reloc_stub::
3763 stub_type_for_reloc(r_type
, address
, destination
);
3764 if (stub_type
== ST_NONE
)
3767 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3768 gold_assert(stub_table
!= NULL
);
3770 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3771 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3774 stub
= new The_reloc_stub(stub_type
);
3775 stub_table
->add_reloc_stub(stub
, key
);
3777 stub
->set_destination_address(destination
);
3778 } // End of Target_aarch64::scan_reloc_for_stub
3781 // This function scans a relocation section for stub generation.
3782 // The template parameter Relocate must be a class type which provides
3783 // a single function, relocate(), which implements the machine
3784 // specific part of a relocation.
3786 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3787 // SHT_REL or SHT_RELA.
3789 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3790 // of relocs. OUTPUT_SECTION is the output section.
3791 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3792 // mapped to output offsets.
3794 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3795 // VIEW_SIZE is the size. These refer to the input section, unless
3796 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3797 // the output section.
3799 template<int size
, bool big_endian
>
3800 template<int sh_type
>
3802 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3803 const Relocate_info
<size
, big_endian
>* relinfo
,
3804 const unsigned char* prelocs
,
3806 Output_section
* /*output_section*/,
3807 bool /*needs_special_offset_handling*/,
3808 const unsigned char* /*view*/,
3809 Address view_address
,
3812 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3814 const int reloc_size
=
3815 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3816 AArch64_relobj
<size
, big_endian
>* object
=
3817 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3818 unsigned int local_count
= object
->local_symbol_count();
3820 gold::Default_comdat_behavior default_comdat_behavior
;
3821 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3823 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3825 Reltype
reloc(prelocs
);
3826 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3827 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3828 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3829 if (r_type
!= elfcpp::R_AARCH64_CALL26
3830 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3833 section_offset_type offset
=
3834 convert_to_section_size_type(reloc
.get_r_offset());
3837 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3838 reloc
.get_r_addend();
3840 const Sized_symbol
<size
>* sym
;
3841 Symbol_value
<size
> symval
;
3842 const Symbol_value
<size
> *psymval
;
3843 bool is_defined_in_discarded_section
;
3845 if (r_sym
< local_count
)
3848 psymval
= object
->local_symbol(r_sym
);
3850 // If the local symbol belongs to a section we are discarding,
3851 // and that section is a debug section, try to find the
3852 // corresponding kept section and map this symbol to its
3853 // counterpart in the kept section. The symbol must not
3854 // correspond to a section we are folding.
3856 shndx
= psymval
->input_shndx(&is_ordinary
);
3857 is_defined_in_discarded_section
=
3859 && shndx
!= elfcpp::SHN_UNDEF
3860 && !object
->is_section_included(shndx
)
3861 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3863 // We need to compute the would-be final value of this local
3865 if (!is_defined_in_discarded_section
)
3867 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3868 if (psymval
->is_section_symbol())
3869 symval
.set_is_section_symbol();
3870 typename
ObjType::Compute_final_local_value_status status
=
3871 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3873 if (status
== ObjType::CFLV_OK
)
3875 // Currently we cannot handle a branch to a target in
3876 // a merged section. If this is the case, issue an error
3877 // and also free the merge symbol value.
3878 if (!symval
.has_output_value())
3880 const std::string
& section_name
=
3881 object
->section_name(shndx
);
3882 object
->error(_("cannot handle branch to local %u "
3883 "in a merged section %s"),
3884 r_sym
, section_name
.c_str());
3890 // We cannot determine the final value.
3898 gsym
= object
->global_symbol(r_sym
);
3899 gold_assert(gsym
!= NULL
);
3900 if (gsym
->is_forwarder())
3901 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
3903 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
3904 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
3905 symval
.set_output_symtab_index(sym
->symtab_index());
3907 symval
.set_no_output_symtab_entry();
3909 // We need to compute the would-be final value of this global
3911 const Symbol_table
* symtab
= relinfo
->symtab
;
3912 const Sized_symbol
<size
>* sized_symbol
=
3913 symtab
->get_sized_symbol
<size
>(gsym
);
3914 Symbol_table::Compute_final_value_status status
;
3915 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3916 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
3918 // Skip this if the symbol has not output section.
3919 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
3921 symval
.set_output_value(value
);
3923 if (gsym
->type() == elfcpp::STT_TLS
)
3924 symval
.set_is_tls_symbol();
3925 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
3926 symval
.set_is_ifunc_symbol();
3929 is_defined_in_discarded_section
=
3930 (gsym
->is_defined_in_discarded_section()
3931 && gsym
->is_undefined());
3935 Symbol_value
<size
> symval2
;
3936 if (is_defined_in_discarded_section
)
3938 if (comdat_behavior
== CB_UNDETERMINED
)
3940 std::string name
= object
->section_name(relinfo
->data_shndx
);
3941 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
3943 if (comdat_behavior
== CB_PRETEND
)
3946 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3947 object
->map_to_kept_section(shndx
, &found
);
3949 symval2
.set_output_value(value
+ psymval
->input_value());
3951 symval2
.set_output_value(0);
3955 if (comdat_behavior
== CB_WARNING
)
3956 gold_warning_at_location(relinfo
, i
, offset
,
3957 _("relocation refers to discarded "
3959 symval2
.set_output_value(0);
3961 symval2
.set_no_output_symtab_entry();
3965 // If symbol is a section symbol, we don't know the actual type of
3966 // destination. Give up.
3967 if (psymval
->is_section_symbol())
3970 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
3971 addend
, view_address
+ offset
);
3972 } // End of iterating relocs in a section
3973 } // End of Target_aarch64::scan_reloc_section_for_stubs
3976 // Scan an input section for stub generation.
3978 template<int size
, bool big_endian
>
3980 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
3981 const Relocate_info
<size
, big_endian
>* relinfo
,
3982 unsigned int sh_type
,
3983 const unsigned char* prelocs
,
3985 Output_section
* output_section
,
3986 bool needs_special_offset_handling
,
3987 const unsigned char* view
,
3988 Address view_address
,
3989 section_size_type view_size
)
3991 gold_assert(sh_type
== elfcpp::SHT_RELA
);
3992 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
3997 needs_special_offset_handling
,
4004 // Relocate a single stub.
4006 template<int size
, bool big_endian
>
4007 void Target_aarch64
<size
, big_endian
>::
4008 relocate_stub(The_reloc_stub
* stub
,
4009 const The_relocate_info
*,
4011 unsigned char* view
,
4015 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
4016 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
4017 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
4019 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
4020 int insn_number
= stub
->insn_num();
4021 const uint32_t* insns
= stub
->insns();
4022 // Check the insns are really those stub insns.
4023 for (int i
= 0; i
< insn_number
; ++i
)
4025 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
4026 gold_assert(((uint32_t)insn
== insns
[i
]));
4029 Address dest
= stub
->destination_address();
4031 switch(stub
->type())
4033 case ST_ADRP_BRANCH
:
4035 // 1st reloc is ADR_PREL_PG_HI21
4036 The_reloc_functions_status status
=
4037 The_reloc_functions::adrp(view
, dest
, address
);
4038 // An error should never arise in the above step. If so, please
4039 // check 'aarch64_valid_for_adrp_p'.
4040 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4042 // 2nd reloc is ADD_ABS_LO12_NC
4043 const AArch64_reloc_property
* arp
=
4044 aarch64_reloc_property_table
->get_reloc_property(
4045 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
4046 gold_assert(arp
!= NULL
);
4047 status
= The_reloc_functions::template
4048 rela_general
<32>(view
+ 4, dest
, 0, arp
);
4049 // An error should never arise, it is an "_NC" relocation.
4050 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4054 case ST_LONG_BRANCH_ABS
:
4055 // 1st reloc is R_AARCH64_PREL64, at offset 8
4056 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
4059 case ST_LONG_BRANCH_PCREL
:
4061 // "PC" calculation is the 2nd insn in the stub.
4062 uint64_t offset
= dest
- (address
+ 4);
4063 // Offset is placed at offset 4 and 5.
4064 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
4074 // A class to handle the PLT data.
4075 // This is an abstract base class that handles most of the linker details
4076 // but does not know the actual contents of PLT entries. The derived
4077 // classes below fill in those details.
4079 template<int size
, bool big_endian
>
4080 class Output_data_plt_aarch64
: public Output_section_data
4083 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
4085 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4087 Output_data_plt_aarch64(Layout
* layout
,
4089 Output_data_got_aarch64
<size
, big_endian
>* got
,
4090 Output_data_space
* got_plt
,
4091 Output_data_space
* got_irelative
)
4092 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
4093 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
4094 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4095 { this->init(layout
); }
4097 // Initialize the PLT section.
4099 init(Layout
* layout
);
4101 // Add an entry to the PLT.
4103 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
4105 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4107 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
4108 Sized_relobj_file
<size
, big_endian
>* relobj
,
4109 unsigned int local_sym_index
);
4111 // Add the relocation for a PLT entry.
4113 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
4114 unsigned int got_offset
);
4116 // Add the reserved TLSDESC_PLT entry to the PLT.
4118 reserve_tlsdesc_entry(unsigned int got_offset
)
4119 { this->tlsdesc_got_offset_
= got_offset
; }
4121 // Return true if a TLSDESC_PLT entry has been reserved.
4123 has_tlsdesc_entry() const
4124 { return this->tlsdesc_got_offset_
!= -1U; }
4126 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4128 get_tlsdesc_got_offset() const
4129 { return this->tlsdesc_got_offset_
; }
4131 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4133 get_tlsdesc_plt_offset() const
4135 return (this->first_plt_entry_offset() +
4136 (this->count_
+ this->irelative_count_
)
4137 * this->get_plt_entry_size());
4140 // Return the .rela.plt section data.
4143 { return this->rel_
; }
4145 // Return where the TLSDESC relocations should go.
4147 rela_tlsdesc(Layout
*);
4149 // Return where the IRELATIVE relocations should go in the PLT
4152 rela_irelative(Symbol_table
*, Layout
*);
4154 // Return whether we created a section for IRELATIVE relocations.
4156 has_irelative_section() const
4157 { return this->irelative_rel_
!= NULL
; }
4159 // Return the number of PLT entries.
4162 { return this->count_
+ this->irelative_count_
; }
4164 // Return the offset of the first non-reserved PLT entry.
4166 first_plt_entry_offset() const
4167 { return this->do_first_plt_entry_offset(); }
4169 // Return the size of a PLT entry.
4171 get_plt_entry_size() const
4172 { return this->do_get_plt_entry_size(); }
4174 // Return the reserved tlsdesc entry size.
4176 get_plt_tlsdesc_entry_size() const
4177 { return this->do_get_plt_tlsdesc_entry_size(); }
4179 // Return the PLT address to use for a global symbol.
4181 address_for_global(const Symbol
*);
4183 // Return the PLT address to use for a local symbol.
4185 address_for_local(const Relobj
*, unsigned int symndx
);
4188 // Fill in the first PLT entry.
4190 fill_first_plt_entry(unsigned char* pov
,
4191 Address got_address
,
4192 Address plt_address
)
4193 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4195 // Fill in a normal PLT entry.
4197 fill_plt_entry(unsigned char* pov
,
4198 Address got_address
,
4199 Address plt_address
,
4200 unsigned int got_offset
,
4201 unsigned int plt_offset
)
4203 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4204 got_offset
, plt_offset
);
4207 // Fill in the reserved TLSDESC PLT entry.
4209 fill_tlsdesc_entry(unsigned char* pov
,
4210 Address gotplt_address
,
4211 Address plt_address
,
4213 unsigned int tlsdesc_got_offset
,
4214 unsigned int plt_offset
)
4216 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4217 tlsdesc_got_offset
, plt_offset
);
4220 virtual unsigned int
4221 do_first_plt_entry_offset() const = 0;
4223 virtual unsigned int
4224 do_get_plt_entry_size() const = 0;
4226 virtual unsigned int
4227 do_get_plt_tlsdesc_entry_size() const = 0;
4230 do_fill_first_plt_entry(unsigned char* pov
,
4232 Address plt_addr
) = 0;
4235 do_fill_plt_entry(unsigned char* pov
,
4236 Address got_address
,
4237 Address plt_address
,
4238 unsigned int got_offset
,
4239 unsigned int plt_offset
) = 0;
4242 do_fill_tlsdesc_entry(unsigned char* pov
,
4243 Address gotplt_address
,
4244 Address plt_address
,
4246 unsigned int tlsdesc_got_offset
,
4247 unsigned int plt_offset
) = 0;
4250 do_adjust_output_section(Output_section
* os
);
4252 // Write to a map file.
4254 do_print_to_mapfile(Mapfile
* mapfile
) const
4255 { mapfile
->print_output_data(this, _("** PLT")); }
4258 // Set the final size.
4260 set_final_data_size();
4262 // Write out the PLT data.
4264 do_write(Output_file
*);
4266 // The reloc section.
4267 Reloc_section
* rel_
;
4269 // The TLSDESC relocs, if necessary. These must follow the regular
4271 Reloc_section
* tlsdesc_rel_
;
4273 // The IRELATIVE relocs, if necessary. These must follow the
4274 // regular PLT relocations.
4275 Reloc_section
* irelative_rel_
;
4277 // The .got section.
4278 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4280 // The .got.plt section.
4281 Output_data_space
* got_plt_
;
4283 // The part of the .got.plt section used for IRELATIVE relocs.
4284 Output_data_space
* got_irelative_
;
4286 // The number of PLT entries.
4287 unsigned int count_
;
4289 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4290 // follow the regular PLT entries.
4291 unsigned int irelative_count_
;
4293 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4294 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4295 // indicates an offset is not allocated.
4296 unsigned int tlsdesc_got_offset_
;
4299 // Initialize the PLT section.
4301 template<int size
, bool big_endian
>
4303 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4305 this->rel_
= new Reloc_section(false);
4306 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4307 elfcpp::SHF_ALLOC
, this->rel_
,
4308 ORDER_DYNAMIC_PLT_RELOCS
, false);
4311 template<int size
, bool big_endian
>
4313 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4316 os
->set_entsize(this->get_plt_entry_size());
4319 // Add an entry to the PLT.
4321 template<int size
, bool big_endian
>
4323 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4324 Layout
* layout
, Symbol
* gsym
)
4326 gold_assert(!gsym
->has_plt_offset());
4328 unsigned int* pcount
;
4329 unsigned int plt_reserved
;
4330 Output_section_data_build
* got
;
4332 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4333 && gsym
->can_use_relative_reloc(false))
4335 pcount
= &this->irelative_count_
;
4337 got
= this->got_irelative_
;
4341 pcount
= &this->count_
;
4342 plt_reserved
= this->first_plt_entry_offset();
4343 got
= this->got_plt_
;
4346 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4351 section_offset_type got_offset
= got
->current_data_size();
4353 // Every PLT entry needs a GOT entry which points back to the PLT
4354 // entry (this will be changed by the dynamic linker, normally
4355 // lazily when the function is called).
4356 got
->set_current_data_size(got_offset
+ size
/ 8);
4358 // Every PLT entry needs a reloc.
4359 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4361 // Note that we don't need to save the symbol. The contents of the
4362 // PLT are independent of which symbols are used. The symbols only
4363 // appear in the relocations.
4366 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4369 template<int size
, bool big_endian
>
4371 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4372 Symbol_table
* symtab
,
4374 Sized_relobj_file
<size
, big_endian
>* relobj
,
4375 unsigned int local_sym_index
)
4377 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4378 ++this->irelative_count_
;
4380 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4382 // Every PLT entry needs a GOT entry which points back to the PLT
4384 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4386 // Every PLT entry needs a reloc.
4387 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4388 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4389 elfcpp::R_AARCH64_IRELATIVE
,
4390 this->got_irelative_
, got_offset
, 0);
4395 // Add the relocation for a PLT entry.
4397 template<int size
, bool big_endian
>
4399 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4400 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4402 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4403 && gsym
->can_use_relative_reloc(false))
4405 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4406 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4407 this->got_irelative_
, got_offset
, 0);
4411 gsym
->set_needs_dynsym_entry();
4412 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4417 // Return where the TLSDESC relocations should go, creating it if
4418 // necessary. These follow the JUMP_SLOT relocations.
4420 template<int size
, bool big_endian
>
4421 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4422 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4424 if (this->tlsdesc_rel_
== NULL
)
4426 this->tlsdesc_rel_
= new Reloc_section(false);
4427 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4428 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4429 ORDER_DYNAMIC_PLT_RELOCS
, false);
4430 gold_assert(this->tlsdesc_rel_
->output_section()
4431 == this->rel_
->output_section());
4433 return this->tlsdesc_rel_
;
4436 // Return where the IRELATIVE relocations should go in the PLT. These
4437 // follow the JUMP_SLOT and the TLSDESC relocations.
4439 template<int size
, bool big_endian
>
4440 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4441 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4444 if (this->irelative_rel_
== NULL
)
4446 // Make sure we have a place for the TLSDESC relocations, in
4447 // case we see any later on.
4448 this->rela_tlsdesc(layout
);
4449 this->irelative_rel_
= new Reloc_section(false);
4450 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4451 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4452 ORDER_DYNAMIC_PLT_RELOCS
, false);
4453 gold_assert(this->irelative_rel_
->output_section()
4454 == this->rel_
->output_section());
4456 if (parameters
->doing_static_link())
4458 // A statically linked executable will only have a .rela.plt
4459 // section to hold R_AARCH64_IRELATIVE relocs for
4460 // STT_GNU_IFUNC symbols. The library will use these
4461 // symbols to locate the IRELATIVE relocs at program startup
4463 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4464 Symbol_table::PREDEFINED
,
4465 this->irelative_rel_
, 0, 0,
4466 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4467 elfcpp::STV_HIDDEN
, 0, false, true);
4468 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4469 Symbol_table::PREDEFINED
,
4470 this->irelative_rel_
, 0, 0,
4471 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4472 elfcpp::STV_HIDDEN
, 0, true, true);
4475 return this->irelative_rel_
;
4478 // Return the PLT address to use for a global symbol.
4480 template<int size
, bool big_endian
>
4482 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4485 uint64_t offset
= 0;
4486 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4487 && gsym
->can_use_relative_reloc(false))
4488 offset
= (this->first_plt_entry_offset() +
4489 this->count_
* this->get_plt_entry_size());
4490 return this->address() + offset
+ gsym
->plt_offset();
4493 // Return the PLT address to use for a local symbol. These are always
4494 // IRELATIVE relocs.
4496 template<int size
, bool big_endian
>
4498 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4499 const Relobj
* object
,
4502 return (this->address()
4503 + this->first_plt_entry_offset()
4504 + this->count_
* this->get_plt_entry_size()
4505 + object
->local_plt_offset(r_sym
));
4508 // Set the final size.
4510 template<int size
, bool big_endian
>
4512 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4514 unsigned int count
= this->count_
+ this->irelative_count_
;
4515 unsigned int extra_size
= 0;
4516 if (this->has_tlsdesc_entry())
4517 extra_size
+= this->get_plt_tlsdesc_entry_size();
4518 this->set_data_size(this->first_plt_entry_offset()
4519 + count
* this->get_plt_entry_size()
4523 template<int size
, bool big_endian
>
4524 class Output_data_plt_aarch64_standard
:
4525 public Output_data_plt_aarch64
<size
, big_endian
>
4528 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4529 Output_data_plt_aarch64_standard(
4531 Output_data_got_aarch64
<size
, big_endian
>* got
,
4532 Output_data_space
* got_plt
,
4533 Output_data_space
* got_irelative
)
4534 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4541 // Return the offset of the first non-reserved PLT entry.
4542 virtual unsigned int
4543 do_first_plt_entry_offset() const
4544 { return this->first_plt_entry_size
; }
4546 // Return the size of a PLT entry
4547 virtual unsigned int
4548 do_get_plt_entry_size() const
4549 { return this->plt_entry_size
; }
4551 // Return the size of a tlsdesc entry
4552 virtual unsigned int
4553 do_get_plt_tlsdesc_entry_size() const
4554 { return this->plt_tlsdesc_entry_size
; }
4557 do_fill_first_plt_entry(unsigned char* pov
,
4558 Address got_address
,
4559 Address plt_address
);
4562 do_fill_plt_entry(unsigned char* pov
,
4563 Address got_address
,
4564 Address plt_address
,
4565 unsigned int got_offset
,
4566 unsigned int plt_offset
);
4569 do_fill_tlsdesc_entry(unsigned char* pov
,
4570 Address gotplt_address
,
4571 Address plt_address
,
4573 unsigned int tlsdesc_got_offset
,
4574 unsigned int plt_offset
);
4577 // The size of the first plt entry size.
4578 static const int first_plt_entry_size
= 32;
4579 // The size of the plt entry size.
4580 static const int plt_entry_size
= 16;
4581 // The size of the plt tlsdesc entry size.
4582 static const int plt_tlsdesc_entry_size
= 32;
4583 // Template for the first PLT entry.
4584 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4585 // Template for subsequent PLT entries.
4586 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4587 // The reserved TLSDESC entry in the PLT for an executable.
4588 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4591 // The first entry in the PLT for an executable.
4595 Output_data_plt_aarch64_standard
<32, false>::
4596 first_plt_entry
[first_plt_entry_size
/ 4] =
4598 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4599 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4600 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4601 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4602 0xd61f0220, /* br x17 */
4603 0xd503201f, /* nop */
4604 0xd503201f, /* nop */
4605 0xd503201f, /* nop */
4611 Output_data_plt_aarch64_standard
<32, true>::
4612 first_plt_entry
[first_plt_entry_size
/ 4] =
4614 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4615 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4616 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4617 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4618 0xd61f0220, /* br x17 */
4619 0xd503201f, /* nop */
4620 0xd503201f, /* nop */
4621 0xd503201f, /* nop */
4627 Output_data_plt_aarch64_standard
<64, false>::
4628 first_plt_entry
[first_plt_entry_size
/ 4] =
4630 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4631 0x90000010, /* adrp x16, PLT_GOT+16 */
4632 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4633 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4634 0xd61f0220, /* br x17 */
4635 0xd503201f, /* nop */
4636 0xd503201f, /* nop */
4637 0xd503201f, /* nop */
4643 Output_data_plt_aarch64_standard
<64, true>::
4644 first_plt_entry
[first_plt_entry_size
/ 4] =
4646 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4647 0x90000010, /* adrp x16, PLT_GOT+16 */
4648 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4649 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4650 0xd61f0220, /* br x17 */
4651 0xd503201f, /* nop */
4652 0xd503201f, /* nop */
4653 0xd503201f, /* nop */
4659 Output_data_plt_aarch64_standard
<32, false>::
4660 plt_entry
[plt_entry_size
/ 4] =
4662 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4663 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4664 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4665 0xd61f0220, /* br x17. */
4671 Output_data_plt_aarch64_standard
<32, true>::
4672 plt_entry
[plt_entry_size
/ 4] =
4674 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4675 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4676 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4677 0xd61f0220, /* br x17. */
4683 Output_data_plt_aarch64_standard
<64, false>::
4684 plt_entry
[plt_entry_size
/ 4] =
4686 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4687 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4688 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4689 0xd61f0220, /* br x17. */
4695 Output_data_plt_aarch64_standard
<64, true>::
4696 plt_entry
[plt_entry_size
/ 4] =
4698 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4699 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4700 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4701 0xd61f0220, /* br x17. */
4705 template<int size
, bool big_endian
>
4707 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4709 Address got_address
,
4710 Address plt_address
)
4712 // PLT0 of the small PLT looks like this in ELF64 -
4713 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4714 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4715 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4717 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4718 // GOTPLT entry for this.
4720 // PLT0 will be slightly different in ELF32 due to different got entry
4722 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4723 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4725 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4726 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4727 // FIXME: This only works for 64bit
4728 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4729 gotplt_2nd_ent
, plt_address
+ 4);
4731 // Fill in R_AARCH64_LDST8_LO12
4732 elfcpp::Swap
<32, big_endian
>::writeval(
4734 ((this->first_plt_entry
[2] & 0xffc003ff)
4735 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4737 // Fill in R_AARCH64_ADD_ABS_LO12
4738 elfcpp::Swap
<32, big_endian
>::writeval(
4740 ((this->first_plt_entry
[3] & 0xffc003ff)
4741 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4745 // Subsequent entries in the PLT for an executable.
4746 // FIXME: This only works for 64bit
4748 template<int size
, bool big_endian
>
4750 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4752 Address got_address
,
4753 Address plt_address
,
4754 unsigned int got_offset
,
4755 unsigned int plt_offset
)
4757 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4759 Address gotplt_entry_address
= got_address
+ got_offset
;
4760 Address plt_entry_address
= plt_address
+ plt_offset
;
4762 // Fill in R_AARCH64_PCREL_ADR_HI21
4763 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4765 gotplt_entry_address
,
4768 // Fill in R_AARCH64_LDST64_ABS_LO12
4769 elfcpp::Swap
<32, big_endian
>::writeval(
4771 ((this->plt_entry
[1] & 0xffc003ff)
4772 | ((gotplt_entry_address
& 0xff8) << 7)));
4774 // Fill in R_AARCH64_ADD_ABS_LO12
4775 elfcpp::Swap
<32, big_endian
>::writeval(
4777 ((this->plt_entry
[2] & 0xffc003ff)
4778 | ((gotplt_entry_address
& 0xfff) <<10)));
4785 Output_data_plt_aarch64_standard
<32, false>::
4786 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4788 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4789 0x90000002, /* adrp x2, 0 */
4790 0x90000003, /* adrp x3, 0 */
4791 0xb9400042, /* ldr w2, [w2, #0] */
4792 0x11000063, /* add w3, w3, 0 */
4793 0xd61f0040, /* br x2 */
4794 0xd503201f, /* nop */
4795 0xd503201f, /* nop */
4800 Output_data_plt_aarch64_standard
<32, true>::
4801 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4803 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4804 0x90000002, /* adrp x2, 0 */
4805 0x90000003, /* adrp x3, 0 */
4806 0xb9400042, /* ldr w2, [w2, #0] */
4807 0x11000063, /* add w3, w3, 0 */
4808 0xd61f0040, /* br x2 */
4809 0xd503201f, /* nop */
4810 0xd503201f, /* nop */
4815 Output_data_plt_aarch64_standard
<64, false>::
4816 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4818 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4819 0x90000002, /* adrp x2, 0 */
4820 0x90000003, /* adrp x3, 0 */
4821 0xf9400042, /* ldr x2, [x2, #0] */
4822 0x91000063, /* add x3, x3, 0 */
4823 0xd61f0040, /* br x2 */
4824 0xd503201f, /* nop */
4825 0xd503201f, /* nop */
4830 Output_data_plt_aarch64_standard
<64, true>::
4831 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4833 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4834 0x90000002, /* adrp x2, 0 */
4835 0x90000003, /* adrp x3, 0 */
4836 0xf9400042, /* ldr x2, [x2, #0] */
4837 0x91000063, /* add x3, x3, 0 */
4838 0xd61f0040, /* br x2 */
4839 0xd503201f, /* nop */
4840 0xd503201f, /* nop */
4843 template<int size
, bool big_endian
>
4845 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4847 Address gotplt_address
,
4848 Address plt_address
,
4850 unsigned int tlsdesc_got_offset
,
4851 unsigned int plt_offset
)
4853 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4855 // move DT_TLSDESC_GOT address into x2
4856 // move .got.plt address into x3
4857 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4858 Address plt_entry_address
= plt_address
+ plt_offset
;
4860 // R_AARCH64_ADR_PREL_PG_HI21
4861 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4864 plt_entry_address
+ 4);
4866 // R_AARCH64_ADR_PREL_PG_HI21
4867 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4870 plt_entry_address
+ 8);
4872 // R_AARCH64_LDST64_ABS_LO12
4873 elfcpp::Swap
<32, big_endian
>::writeval(
4875 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4876 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4878 // R_AARCH64_ADD_ABS_LO12
4879 elfcpp::Swap
<32, big_endian
>::writeval(
4881 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
4882 | ((gotplt_address
& 0xfff) << 10)));
4885 // Write out the PLT. This uses the hand-coded instructions above,
4886 // and adjusts them as needed. This is specified by the AMD64 ABI.
4888 template<int size
, bool big_endian
>
4890 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
4892 const off_t offset
= this->offset();
4893 const section_size_type oview_size
=
4894 convert_to_section_size_type(this->data_size());
4895 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
4897 const off_t got_file_offset
= this->got_plt_
->offset();
4898 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
4899 == this->got_irelative_
->offset());
4901 const section_size_type got_size
=
4902 convert_to_section_size_type(this->got_plt_
->data_size()
4903 + this->got_irelative_
->data_size());
4904 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
4907 unsigned char* pov
= oview
;
4909 // The base address of the .plt section.
4910 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
4911 // The base address of the PLT portion of the .got section.
4912 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
4913 = this->got_plt_
->address();
4915 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
4916 pov
+= this->first_plt_entry_offset();
4918 // The first three entries in .got.plt are reserved.
4919 unsigned char* got_pov
= got_view
;
4920 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
4921 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4923 unsigned int plt_offset
= this->first_plt_entry_offset();
4924 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4925 const unsigned int count
= this->count_
+ this->irelative_count_
;
4926 for (unsigned int plt_index
= 0;
4929 pov
+= this->get_plt_entry_size(),
4930 got_pov
+= size
/ 8,
4931 plt_offset
+= this->get_plt_entry_size(),
4932 got_offset
+= size
/ 8)
4934 // Set and adjust the PLT entry itself.
4935 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
4936 got_offset
, plt_offset
);
4938 // Set the entry in the GOT, which points to plt0.
4939 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
4942 if (this->has_tlsdesc_entry())
4944 // Set and adjust the reserved TLSDESC PLT entry.
4945 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
4946 // The base address of the .base section.
4947 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
4948 this->got_
->address();
4949 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4950 tlsdesc_got_offset
, plt_offset
);
4951 pov
+= this->get_plt_tlsdesc_entry_size();
4954 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
4955 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
4957 of
->write_output_view(offset
, oview_size
, oview
);
4958 of
->write_output_view(got_file_offset
, got_size
, got_view
);
4961 // Telling how to update the immediate field of an instruction.
4962 struct AArch64_howto
4964 // The immediate field mask.
4965 elfcpp::Elf_Xword dst_mask
;
4967 // The offset to apply relocation immediate
4970 // The second part offset, if the immediate field has two parts.
4971 // -1 if the immediate field has only one part.
4975 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
4977 {0, -1, -1}, // DATA
4978 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
4979 {0xffffe0, 5, -1}, // LD [23:5]-imm19
4980 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
4981 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
4982 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
4983 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
4984 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
4985 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
4986 {0x3ffffff, 0, -1}, // B [25:0]-imm26
4987 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
4990 // AArch64 relocate function class
4992 template<int size
, bool big_endian
>
4993 class AArch64_relocate_functions
4998 STATUS_OKAY
, // No error during relocation.
4999 STATUS_OVERFLOW
, // Relocation overflow.
5000 STATUS_BAD_RELOC
, // Relocation cannot be applied.
5003 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
5004 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
5005 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
5006 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
5007 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
5008 typedef Stub_table
<size
, big_endian
> The_stub_table
;
5009 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
5010 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
5012 // Return the page address of the address.
5013 // Page(address) = address & ~0xFFF
5015 static inline AArch64_valtype
5016 Page(Address address
)
5018 return (address
& (~static_cast<Address
>(0xFFF)));
5022 // Update instruction (pointed by view) with selected bits (immed).
5023 // val = (val & ~dst_mask) | (immed << doffset)
5025 template<int valsize
>
5027 update_view(unsigned char* view
,
5028 AArch64_valtype immed
,
5029 elfcpp::Elf_Xword doffset
,
5030 elfcpp::Elf_Xword dst_mask
)
5032 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5033 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5034 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5036 // Clear immediate fields.
5038 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5039 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5042 // Update two parts of an instruction (pointed by view) with selected
5043 // bits (immed1 and immed2).
5044 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5046 template<int valsize
>
5048 update_view_two_parts(
5049 unsigned char* view
,
5050 AArch64_valtype immed1
,
5051 AArch64_valtype immed2
,
5052 elfcpp::Elf_Xword doffset1
,
5053 elfcpp::Elf_Xword doffset2
,
5054 elfcpp::Elf_Xword dst_mask
)
5056 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5057 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5058 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5060 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5061 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
5062 (immed2
<< doffset2
)));
5065 // Update adr or adrp instruction with immed.
5066 // In adr and adrp: [30:29] immlo [23:5] immhi
5069 update_adr(unsigned char* view
, AArch64_valtype immed
)
5071 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
5072 This::template update_view_two_parts
<32>(
5075 (immed
& 0x1ffffc) >> 2,
5081 // Update movz/movn instruction with bits immed.
5082 // Set instruction to movz if is_movz is true, otherwise set instruction
5086 update_movnz(unsigned char* view
,
5087 AArch64_valtype immed
,
5090 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
5091 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5092 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
5094 const elfcpp::Elf_Xword doffset
=
5095 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
5096 const elfcpp::Elf_Xword dst_mask
=
5097 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
5099 // Clear immediate fields and opc code.
5100 val
&= ~(dst_mask
| (0x3 << 29));
5102 // Set instruction to movz or movn.
5103 // movz: [30:29] is 10 movn: [30:29] is 00
5107 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
5108 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5113 // Update selected bits in text.
5115 template<int valsize
>
5116 static inline typename
This::Status
5117 reloc_common(unsigned char* view
, Address x
,
5118 const AArch64_reloc_property
* reloc_property
)
5120 // Select bits from X.
5121 Address immed
= reloc_property
->select_x_value(x
);
5124 const AArch64_reloc_property::Reloc_inst inst
=
5125 reloc_property
->reloc_inst();
5126 // If it is a data relocation or instruction has 2 parts of immediate
5127 // fields, you should not call pcrela_general.
5128 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
5129 aarch64_howto
[inst
].doffset
!= -1);
5130 This::template update_view
<valsize
>(view
, immed
,
5131 aarch64_howto
[inst
].doffset
,
5132 aarch64_howto
[inst
].dst_mask
);
5134 // Do check overflow or alignment if needed.
5135 return (reloc_property
->checkup_x_value(x
)
5137 : This::STATUS_OVERFLOW
);
5140 // Construct a B insn. Note, although we group it here with other relocation
5141 // operation, there is actually no 'relocation' involved here.
5143 construct_b(unsigned char* view
, unsigned int branch_offset
)
5145 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5149 // Do a simple rela relocation at unaligned addresses.
5151 template<int valsize
>
5152 static inline typename
This::Status
5153 rela_ua(unsigned char* view
,
5154 const Sized_relobj_file
<size
, big_endian
>* object
,
5155 const Symbol_value
<size
>* psymval
,
5156 AArch64_valtype addend
,
5157 const AArch64_reloc_property
* reloc_property
)
5159 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5161 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5162 psymval
->value(object
, addend
);
5163 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5164 static_cast<Valtype
>(x
));
5165 return (reloc_property
->checkup_x_value(x
)
5167 : This::STATUS_OVERFLOW
);
5170 // Do a simple pc-relative relocation at unaligned addresses.
5172 template<int valsize
>
5173 static inline typename
This::Status
5174 pcrela_ua(unsigned char* view
,
5175 const Sized_relobj_file
<size
, big_endian
>* object
,
5176 const Symbol_value
<size
>* psymval
,
5177 AArch64_valtype addend
,
5179 const AArch64_reloc_property
* reloc_property
)
5181 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5183 Address x
= psymval
->value(object
, addend
) - address
;
5184 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5185 static_cast<Valtype
>(x
));
5186 return (reloc_property
->checkup_x_value(x
)
5188 : This::STATUS_OVERFLOW
);
5191 // Do a simple rela relocation at aligned addresses.
5193 template<int valsize
>
5194 static inline typename
This::Status
5196 unsigned char* view
,
5197 const Sized_relobj_file
<size
, big_endian
>* object
,
5198 const Symbol_value
<size
>* psymval
,
5199 AArch64_valtype addend
,
5200 const AArch64_reloc_property
* reloc_property
)
5202 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5203 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5204 Address x
= psymval
->value(object
, addend
);
5205 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5206 return (reloc_property
->checkup_x_value(x
)
5208 : This::STATUS_OVERFLOW
);
5211 // Do relocate. Update selected bits in text.
5212 // new_val = (val & ~dst_mask) | (immed << doffset)
5214 template<int valsize
>
5215 static inline typename
This::Status
5216 rela_general(unsigned char* view
,
5217 const Sized_relobj_file
<size
, big_endian
>* object
,
5218 const Symbol_value
<size
>* psymval
,
5219 AArch64_valtype addend
,
5220 const AArch64_reloc_property
* reloc_property
)
5222 // Calculate relocation.
5223 Address x
= psymval
->value(object
, addend
);
5224 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5227 // Do relocate. Update selected bits in text.
5228 // new val = (val & ~dst_mask) | (immed << doffset)
5230 template<int valsize
>
5231 static inline typename
This::Status
5233 unsigned char* view
,
5235 AArch64_valtype addend
,
5236 const AArch64_reloc_property
* reloc_property
)
5238 // Calculate relocation.
5239 Address x
= s
+ addend
;
5240 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5243 // Do address relative relocate. Update selected bits in text.
5244 // new val = (val & ~dst_mask) | (immed << doffset)
5246 template<int valsize
>
5247 static inline typename
This::Status
5249 unsigned char* view
,
5250 const Sized_relobj_file
<size
, big_endian
>* object
,
5251 const Symbol_value
<size
>* psymval
,
5252 AArch64_valtype addend
,
5254 const AArch64_reloc_property
* reloc_property
)
5256 // Calculate relocation.
5257 Address x
= psymval
->value(object
, addend
) - address
;
5258 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5262 // Calculate (S + A) - address, update adr instruction.
5264 static inline typename
This::Status
5265 adr(unsigned char* view
,
5266 const Sized_relobj_file
<size
, big_endian
>* object
,
5267 const Symbol_value
<size
>* psymval
,
5270 const AArch64_reloc_property
* /* reloc_property */)
5272 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5273 // Pick bits [20:0] of X.
5274 AArch64_valtype immed
= x
& 0x1fffff;
5275 update_adr(view
, immed
);
5276 // Check -2^20 <= X < 2^20
5277 return (size
== 64 && Bits
<21>::has_overflow((x
))
5278 ? This::STATUS_OVERFLOW
5279 : This::STATUS_OKAY
);
5282 // Calculate PG(S+A) - PG(address), update adrp instruction.
5283 // R_AARCH64_ADR_PREL_PG_HI21
5285 static inline typename
This::Status
5287 unsigned char* view
,
5291 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5292 // Pick [32:12] of X.
5293 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5294 update_adr(view
, immed
);
5295 // Check -2^32 <= X < 2^32
5296 return (size
== 64 && Bits
<33>::has_overflow((x
))
5297 ? This::STATUS_OVERFLOW
5298 : This::STATUS_OKAY
);
5301 // Calculate PG(S+A) - PG(address), update adrp instruction.
5302 // R_AARCH64_ADR_PREL_PG_HI21
5304 static inline typename
This::Status
5305 adrp(unsigned char* view
,
5306 const Sized_relobj_file
<size
, big_endian
>* object
,
5307 const Symbol_value
<size
>* psymval
,
5310 const AArch64_reloc_property
* reloc_property
)
5312 Address sa
= psymval
->value(object
, addend
);
5313 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5314 // Pick [32:12] of X.
5315 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5316 update_adr(view
, immed
);
5317 return (reloc_property
->checkup_x_value(x
)
5319 : This::STATUS_OVERFLOW
);
5322 // Update mov[n/z] instruction. Check overflow if needed.
5323 // If X >=0, set the instruction to movz and its immediate value to the
5325 // If X < 0, set the instruction to movn and its immediate value to
5326 // NOT (selected bits of).
5328 static inline typename
This::Status
5329 movnz(unsigned char* view
,
5331 const AArch64_reloc_property
* reloc_property
)
5333 // Select bits from X.
5336 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5337 if (static_cast<SignedW
>(x
) >= 0)
5339 immed
= reloc_property
->select_x_value(x
);
5344 immed
= reloc_property
->select_x_value(~x
);;
5348 // Update movnz instruction.
5349 update_movnz(view
, immed
, is_movz
);
5351 // Do check overflow or alignment if needed.
5352 return (reloc_property
->checkup_x_value(x
)
5354 : This::STATUS_OVERFLOW
);
5358 maybe_apply_stub(unsigned int,
5359 const The_relocate_info
*,
5363 const Sized_symbol
<size
>*,
5364 const Symbol_value
<size
>*,
5365 const Sized_relobj_file
<size
, big_endian
>*,
5368 }; // End of AArch64_relocate_functions
5371 // For a certain relocation type (usually jump/branch), test to see if the
5372 // destination needs a stub to fulfil. If so, re-route the destination of the
5373 // original instruction to the stub, note, at this time, the stub has already
5376 template<int size
, bool big_endian
>
5378 AArch64_relocate_functions
<size
, big_endian
>::
5379 maybe_apply_stub(unsigned int r_type
,
5380 const The_relocate_info
* relinfo
,
5381 const The_rela
& rela
,
5382 unsigned char* view
,
5384 const Sized_symbol
<size
>* gsym
,
5385 const Symbol_value
<size
>* psymval
,
5386 const Sized_relobj_file
<size
, big_endian
>* object
,
5387 section_size_type current_group_size
)
5389 if (parameters
->options().relocatable())
5392 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5393 Address branch_target
= psymval
->value(object
, 0) + addend
;
5395 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5396 if (stub_type
== ST_NONE
)
5399 const The_aarch64_relobj
* aarch64_relobj
=
5400 static_cast<const The_aarch64_relobj
*>(object
);
5401 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5402 gold_assert(stub_table
!= NULL
);
5404 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5405 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5406 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5407 gold_assert(stub
!= NULL
);
5409 Address new_branch_target
= stub_table
->address() + stub
->offset();
5410 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5411 new_branch_target
- address
;
5412 const AArch64_reloc_property
* arp
=
5413 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5414 gold_assert(arp
!= NULL
);
5415 typename
This::Status status
= This::template
5416 rela_general
<32>(view
, branch_offset
, 0, arp
);
5417 if (status
!= This::STATUS_OKAY
)
5418 gold_error(_("Stub is too far away, try a smaller value "
5419 "for '--stub-group-size'. The current value is 0x%lx."),
5420 static_cast<unsigned long>(current_group_size
));
5425 // Group input sections for stub generation.
5427 // We group input sections in an output section so that the total size,
5428 // including any padding space due to alignment is smaller than GROUP_SIZE
5429 // unless the only input section in group is bigger than GROUP_SIZE already.
5430 // Then an ARM stub table is created to follow the last input section
5431 // in group. For each group an ARM stub table is created an is placed
5432 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5433 // extend the group after the stub table.
5435 template<int size
, bool big_endian
>
5437 Target_aarch64
<size
, big_endian
>::group_sections(
5439 section_size_type group_size
,
5440 bool stubs_always_after_branch
,
5443 // Group input sections and insert stub table
5444 Layout::Section_list section_list
;
5445 layout
->get_executable_sections(§ion_list
);
5446 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5447 p
!= section_list
.end();
5450 AArch64_output_section
<size
, big_endian
>* output_section
=
5451 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5452 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5458 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5459 // section of RELOBJ.
5461 template<int size
, bool big_endian
>
5462 AArch64_input_section
<size
, big_endian
>*
5463 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5464 Relobj
* relobj
, unsigned int shndx
) const
5466 Section_id
sid(relobj
, shndx
);
5467 typename
AArch64_input_section_map::const_iterator p
=
5468 this->aarch64_input_section_map_
.find(sid
);
5469 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5473 // Make a new AArch64_input_section object.
5475 template<int size
, bool big_endian
>
5476 AArch64_input_section
<size
, big_endian
>*
5477 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5478 Relobj
* relobj
, unsigned int shndx
)
5480 Section_id
sid(relobj
, shndx
);
5482 AArch64_input_section
<size
, big_endian
>* input_section
=
5483 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5484 input_section
->init();
5486 // Register new AArch64_input_section in map for look-up.
5487 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5488 this->aarch64_input_section_map_
.insert(
5489 std::make_pair(sid
, input_section
));
5491 // Make sure that it we have not created another AArch64_input_section
5492 // for this input section already.
5493 gold_assert(ins
.second
);
5495 return input_section
;
5499 // Relaxation hook. This is where we do stub generation.
5501 template<int size
, bool big_endian
>
5503 Target_aarch64
<size
, big_endian
>::do_relax(
5505 const Input_objects
* input_objects
,
5506 Symbol_table
* symtab
,
5510 gold_assert(!parameters
->options().relocatable());
5513 // We don't handle negative stub_group_size right now.
5514 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5515 if (this->stub_group_size_
== 1)
5517 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5518 // will fail to link. The user will have to relink with an explicit
5519 // group size option.
5520 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5523 group_sections(layout
, this->stub_group_size_
, true, task
);
5527 // If this is not the first pass, addresses and file offsets have
5528 // been reset at this point, set them here.
5529 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5530 sp
!= this->stub_tables_
.end(); ++sp
)
5532 The_stub_table
* stt
= *sp
;
5533 The_aarch64_input_section
* owner
= stt
->owner();
5534 off_t off
= align_address(owner
->original_size(),
5536 stt
->set_address_and_file_offset(owner
->address() + off
,
5537 owner
->offset() + off
);
5541 // Scan relocs for relocation stubs
5542 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5543 op
!= input_objects
->relobj_end();
5546 The_aarch64_relobj
* aarch64_relobj
=
5547 static_cast<The_aarch64_relobj
*>(*op
);
5548 // Lock the object so we can read from it. This is only called
5549 // single-threaded from Layout::finalize, so it is OK to lock.
5550 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5551 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5554 bool any_stub_table_changed
= false;
5555 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5556 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5558 The_stub_table
* stub_table
= *siter
;
5559 if (stub_table
->update_data_size_changed_p())
5561 The_aarch64_input_section
* owner
= stub_table
->owner();
5562 uint64_t address
= owner
->address();
5563 off_t offset
= owner
->offset();
5564 owner
->reset_address_and_file_offset();
5565 owner
->set_address_and_file_offset(address
, offset
);
5567 any_stub_table_changed
= true;
5571 // Do not continue relaxation.
5572 bool continue_relaxation
= any_stub_table_changed
;
5573 if (!continue_relaxation
)
5574 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5575 (sp
!= this->stub_tables_
.end());
5577 (*sp
)->finalize_stubs();
5579 return continue_relaxation
;
5583 // Make a new Stub_table.
5585 template<int size
, bool big_endian
>
5586 Stub_table
<size
, big_endian
>*
5587 Target_aarch64
<size
, big_endian
>::new_stub_table(
5588 AArch64_input_section
<size
, big_endian
>* owner
)
5590 Stub_table
<size
, big_endian
>* stub_table
=
5591 new Stub_table
<size
, big_endian
>(owner
);
5592 stub_table
->set_address(align_address(
5593 owner
->address() + owner
->data_size(), 8));
5594 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5595 stub_table
->finalize_data_size();
5597 this->stub_tables_
.push_back(stub_table
);
5603 template<int size
, bool big_endian
>
5605 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5606 void* arg
, unsigned int r_type
, uint64_t) const
5608 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5609 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5610 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5611 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5612 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5613 gold_assert(psymval
->is_tls_symbol());
5614 // The value of a TLS symbol is the offset in the TLS segment.
5615 return psymval
->value(ti
.object
, 0);
5618 // Return the number of entries in the PLT.
5620 template<int size
, bool big_endian
>
5622 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5624 if (this->plt_
== NULL
)
5626 return this->plt_
->entry_count();
5629 // Return the offset of the first non-reserved PLT entry.
5631 template<int size
, bool big_endian
>
5633 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5635 return this->plt_
->first_plt_entry_offset();
5638 // Return the size of each PLT entry.
5640 template<int size
, bool big_endian
>
5642 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5644 return this->plt_
->get_plt_entry_size();
5647 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5649 template<int size
, bool big_endian
>
5651 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5652 Symbol_table
* symtab
, Layout
* layout
)
5654 if (this->tls_base_symbol_defined_
)
5657 Output_segment
* tls_segment
= layout
->tls_segment();
5658 if (tls_segment
!= NULL
)
5660 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5661 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5662 Symbol_table::PREDEFINED
,
5666 elfcpp::STV_HIDDEN
, 0,
5667 Symbol::SEGMENT_START
,
5670 this->tls_base_symbol_defined_
= true;
5673 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5675 template<int size
, bool big_endian
>
5677 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5678 Symbol_table
* symtab
, Layout
* layout
)
5680 if (this->plt_
== NULL
)
5681 this->make_plt_section(symtab
, layout
);
5683 if (!this->plt_
->has_tlsdesc_entry())
5685 // Allocate the TLSDESC_GOT entry.
5686 Output_data_got_aarch64
<size
, big_endian
>* got
=
5687 this->got_section(symtab
, layout
);
5688 unsigned int got_offset
= got
->add_constant(0);
5690 // Allocate the TLSDESC_PLT entry.
5691 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5695 // Create a GOT entry for the TLS module index.
5697 template<int size
, bool big_endian
>
5699 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5700 Symbol_table
* symtab
, Layout
* layout
,
5701 Sized_relobj_file
<size
, big_endian
>* object
)
5703 if (this->got_mod_index_offset_
== -1U)
5705 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5706 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5707 Output_data_got_aarch64
<size
, big_endian
>* got
=
5708 this->got_section(symtab
, layout
);
5709 unsigned int got_offset
= got
->add_constant(0);
5710 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5712 got
->add_constant(0);
5713 this->got_mod_index_offset_
= got_offset
;
5715 return this->got_mod_index_offset_
;
5718 // Optimize the TLS relocation type based on what we know about the
5719 // symbol. IS_FINAL is true if the final address of this symbol is
5720 // known at link time.
5722 template<int size
, bool big_endian
>
5723 tls::Tls_optimization
5724 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5727 // If we are generating a shared library, then we can't do anything
5729 if (parameters
->options().shared())
5730 return tls::TLSOPT_NONE
;
5734 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5735 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5736 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5737 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5738 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5739 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5740 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5741 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5742 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5743 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5744 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5745 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5746 // These are General-Dynamic which permits fully general TLS
5747 // access. Since we know that we are generating an executable,
5748 // we can convert this to Initial-Exec. If we also know that
5749 // this is a local symbol, we can further switch to Local-Exec.
5751 return tls::TLSOPT_TO_LE
;
5752 return tls::TLSOPT_TO_IE
;
5754 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5755 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5756 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5757 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5758 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5759 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5760 // These are Local-Dynamic, which refer to local symbols in the
5761 // dynamic TLS block. Since we know that we generating an
5762 // executable, we can switch to Local-Exec.
5763 return tls::TLSOPT_TO_LE
;
5765 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5766 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5767 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5768 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5769 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5770 // These are Initial-Exec relocs which get the thread offset
5771 // from the GOT. If we know that we are linking against the
5772 // local symbol, we can switch to Local-Exec, which links the
5773 // thread offset into the instruction.
5775 return tls::TLSOPT_TO_LE
;
5776 return tls::TLSOPT_NONE
;
5778 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5779 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5780 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5781 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5782 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5783 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5784 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5785 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5786 // When we already have Local-Exec, there is nothing further we
5788 return tls::TLSOPT_NONE
;
5795 // Returns true if this relocation type could be that of a function pointer.
5797 template<int size
, bool big_endian
>
5799 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5800 unsigned int r_type
)
5804 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5805 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5806 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5807 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5808 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5816 // For safe ICF, scan a relocation for a local symbol to check if it
5817 // corresponds to a function pointer being taken. In that case mark
5818 // the function whose pointer was taken as not foldable.
5820 template<int size
, bool big_endian
>
5822 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5825 Target_aarch64
<size
, big_endian
>* ,
5826 Sized_relobj_file
<size
, big_endian
>* ,
5829 const elfcpp::Rela
<size
, big_endian
>& ,
5830 unsigned int r_type
,
5831 const elfcpp::Sym
<size
, big_endian
>&)
5833 // When building a shared library, do not fold any local symbols.
5834 return (parameters
->options().shared()
5835 || possible_function_pointer_reloc(r_type
));
5838 // For safe ICF, scan a relocation for a global symbol to check if it
5839 // corresponds to a function pointer being taken. In that case mark
5840 // the function whose pointer was taken as not foldable.
5842 template<int size
, bool big_endian
>
5844 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5847 Target_aarch64
<size
, big_endian
>* ,
5848 Sized_relobj_file
<size
, big_endian
>* ,
5851 const elfcpp::Rela
<size
, big_endian
>& ,
5852 unsigned int r_type
,
5855 // When building a shared library, do not fold symbols whose visibility
5856 // is hidden, internal or protected.
5857 return ((parameters
->options().shared()
5858 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5859 || gsym
->visibility() == elfcpp::STV_PROTECTED
5860 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5861 || possible_function_pointer_reloc(r_type
));
5864 // Report an unsupported relocation against a local symbol.
5866 template<int size
, bool big_endian
>
5868 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
5869 Sized_relobj_file
<size
, big_endian
>* object
,
5870 unsigned int r_type
)
5872 gold_error(_("%s: unsupported reloc %u against local symbol"),
5873 object
->name().c_str(), r_type
);
5876 // We are about to emit a dynamic relocation of type R_TYPE. If the
5877 // dynamic linker does not support it, issue an error.
5879 template<int size
, bool big_endian
>
5881 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
5882 unsigned int r_type
)
5884 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
5888 // These are the relocation types supported by glibc for AARCH64.
5889 case elfcpp::R_AARCH64_NONE
:
5890 case elfcpp::R_AARCH64_COPY
:
5891 case elfcpp::R_AARCH64_GLOB_DAT
:
5892 case elfcpp::R_AARCH64_JUMP_SLOT
:
5893 case elfcpp::R_AARCH64_RELATIVE
:
5894 case elfcpp::R_AARCH64_TLS_DTPREL64
:
5895 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
5896 case elfcpp::R_AARCH64_TLS_TPREL64
:
5897 case elfcpp::R_AARCH64_TLSDESC
:
5898 case elfcpp::R_AARCH64_IRELATIVE
:
5899 case elfcpp::R_AARCH64_ABS32
:
5900 case elfcpp::R_AARCH64_ABS64
:
5907 // This prevents us from issuing more than one error per reloc
5908 // section. But we can still wind up issuing more than one
5909 // error per object file.
5910 if (this->issued_non_pic_error_
)
5912 gold_assert(parameters
->options().output_is_position_independent());
5913 object
->error(_("requires unsupported dynamic reloc; "
5914 "recompile with -fPIC"));
5915 this->issued_non_pic_error_
= true;
5919 // Return whether we need to make a PLT entry for a relocation of the
5920 // given type against a STT_GNU_IFUNC symbol.
5922 template<int size
, bool big_endian
>
5924 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
5925 Sized_relobj_file
<size
, big_endian
>* object
,
5926 unsigned int r_type
)
5928 const AArch64_reloc_property
* arp
=
5929 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5930 gold_assert(arp
!= NULL
);
5932 int flags
= arp
->reference_flags();
5933 if (flags
& Symbol::TLS_REF
)
5935 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5936 object
->name().c_str(), arp
->name().c_str());
5942 // Scan a relocation for a local symbol.
5944 template<int size
, bool big_endian
>
5946 Target_aarch64
<size
, big_endian
>::Scan::local(
5947 Symbol_table
* symtab
,
5949 Target_aarch64
<size
, big_endian
>* target
,
5950 Sized_relobj_file
<size
, big_endian
>* object
,
5951 unsigned int data_shndx
,
5952 Output_section
* output_section
,
5953 const elfcpp::Rela
<size
, big_endian
>& rela
,
5954 unsigned int r_type
,
5955 const elfcpp::Sym
<size
, big_endian
>& lsym
,
5961 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
5963 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5965 // A local STT_GNU_IFUNC symbol may require a PLT entry.
5966 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
5967 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
5968 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
5972 case elfcpp::R_AARCH64_NONE
:
5975 case elfcpp::R_AARCH64_ABS32
:
5976 case elfcpp::R_AARCH64_ABS16
:
5977 if (parameters
->options().output_is_position_independent())
5979 gold_error(_("%s: unsupported reloc %u in pos independent link."),
5980 object
->name().c_str(), r_type
);
5984 case elfcpp::R_AARCH64_ABS64
:
5985 // If building a shared library or pie, we need to mark this as a dynmic
5986 // reloction, so that the dynamic loader can relocate it.
5987 if (parameters
->options().output_is_position_independent())
5989 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
5990 rela_dyn
->add_local_relative(object
, r_sym
,
5991 elfcpp::R_AARCH64_RELATIVE
,
5994 rela
.get_r_offset(),
5995 rela
.get_r_addend(),
6000 case elfcpp::R_AARCH64_PREL64
:
6001 case elfcpp::R_AARCH64_PREL32
:
6002 case elfcpp::R_AARCH64_PREL16
:
6005 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6006 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6007 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6008 // The above relocations are used to access GOT entries.
6010 Output_data_got_aarch64
<size
, big_endian
>* got
=
6011 target
->got_section(symtab
, layout
);
6012 bool is_new
= false;
6013 // This symbol requires a GOT entry.
6015 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
6017 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
6018 if (is_new
&& parameters
->options().output_is_position_independent())
6019 target
->rela_dyn_section(layout
)->
6020 add_local_relative(object
,
6022 elfcpp::R_AARCH64_RELATIVE
,
6024 object
->local_got_offset(r_sym
,
6031 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6032 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6033 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6034 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6035 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6036 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6037 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6038 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6039 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6040 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6041 if (parameters
->options().output_is_position_independent())
6043 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6044 object
->name().c_str(), r_type
);
6048 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6049 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6050 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6051 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6052 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6053 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6054 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6055 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6056 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6057 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6060 // Control flow, pc-relative. We don't need to do anything for a relative
6061 // addressing relocation against a local symbol if it does not reference
6063 case elfcpp::R_AARCH64_TSTBR14
:
6064 case elfcpp::R_AARCH64_CONDBR19
:
6065 case elfcpp::R_AARCH64_JUMP26
:
6066 case elfcpp::R_AARCH64_CALL26
:
6069 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6070 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6072 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6073 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6074 if (tlsopt
== tls::TLSOPT_TO_LE
)
6077 layout
->set_has_static_tls();
6078 // Create a GOT entry for the tp-relative offset.
6079 if (!parameters
->doing_static_link())
6081 Output_data_got_aarch64
<size
, big_endian
>* got
=
6082 target
->got_section(symtab
, layout
);
6083 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
6084 target
->rela_dyn_section(layout
),
6085 elfcpp::R_AARCH64_TLS_TPREL64
);
6087 else if (!object
->local_has_got_offset(r_sym
,
6088 GOT_TYPE_TLS_OFFSET
))
6090 Output_data_got_aarch64
<size
, big_endian
>* got
=
6091 target
->got_section(symtab
, layout
);
6092 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
6093 unsigned int got_offset
=
6094 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
6095 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6096 gold_assert(addend
== 0);
6097 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
6103 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6104 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6106 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6107 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6108 if (tlsopt
== tls::TLSOPT_TO_LE
)
6110 layout
->set_has_static_tls();
6113 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6115 Output_data_got_aarch64
<size
, big_endian
>* got
=
6116 target
->got_section(symtab
, layout
);
6117 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
6119 target
->rela_dyn_section(layout
),
6120 elfcpp::R_AARCH64_TLS_DTPMOD64
);
6124 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6125 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6126 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6127 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6128 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6129 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6130 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6131 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6133 layout
->set_has_static_tls();
6134 bool output_is_shared
= parameters
->options().shared();
6135 if (output_is_shared
)
6136 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6137 object
->name().c_str(), r_type
);
6141 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6142 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6144 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6145 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6146 if (tlsopt
== tls::TLSOPT_NONE
)
6148 // Create a GOT entry for the module index.
6149 target
->got_mod_index_entry(symtab
, layout
, object
);
6151 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6152 unsupported_reloc_local(object
, r_type
);
6156 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6157 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6158 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6159 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6162 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6163 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6164 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6166 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6167 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6168 target
->define_tls_base_symbol(symtab
, layout
);
6169 if (tlsopt
== tls::TLSOPT_NONE
)
6171 // Create reserved PLT and GOT entries for the resolver.
6172 target
->reserve_tlsdesc_entries(symtab
, layout
);
6174 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6175 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6176 // entry needs to be in an area in .got.plt, not .got. Call
6177 // got_section to make sure the section has been created.
6178 target
->got_section(symtab
, layout
);
6179 Output_data_got
<size
, big_endian
>* got
=
6180 target
->got_tlsdesc_section();
6181 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6182 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
6184 unsigned int got_offset
= got
->add_constant(0);
6185 got
->add_constant(0);
6186 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
6188 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6189 // We store the arguments we need in a vector, and use
6190 // the index into the vector as the parameter to pass
6191 // to the target specific routines.
6192 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6193 void* arg
= reinterpret_cast<void*>(intarg
);
6194 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6195 got
, got_offset
, 0);
6198 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6199 unsupported_reloc_local(object
, r_type
);
6203 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6207 unsupported_reloc_local(object
, r_type
);
6212 // Report an unsupported relocation against a global symbol.
6214 template<int size
, bool big_endian
>
6216 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6217 Sized_relobj_file
<size
, big_endian
>* object
,
6218 unsigned int r_type
,
6221 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6222 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6225 template<int size
, bool big_endian
>
6227 Target_aarch64
<size
, big_endian
>::Scan::global(
6228 Symbol_table
* symtab
,
6230 Target_aarch64
<size
, big_endian
>* target
,
6231 Sized_relobj_file
<size
, big_endian
> * object
,
6232 unsigned int data_shndx
,
6233 Output_section
* output_section
,
6234 const elfcpp::Rela
<size
, big_endian
>& rela
,
6235 unsigned int r_type
,
6238 // A STT_GNU_IFUNC symbol may require a PLT entry.
6239 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6240 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6241 target
->make_plt_entry(symtab
, layout
, gsym
);
6243 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6245 const AArch64_reloc_property
* arp
=
6246 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6247 gold_assert(arp
!= NULL
);
6251 case elfcpp::R_AARCH64_NONE
:
6254 case elfcpp::R_AARCH64_ABS16
:
6255 case elfcpp::R_AARCH64_ABS32
:
6256 case elfcpp::R_AARCH64_ABS64
:
6258 // Make a PLT entry if necessary.
6259 if (gsym
->needs_plt_entry())
6261 target
->make_plt_entry(symtab
, layout
, gsym
);
6262 // Since this is not a PC-relative relocation, we may be
6263 // taking the address of a function. In that case we need to
6264 // set the entry in the dynamic symbol table to the address of
6266 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6267 gsym
->set_needs_dynsym_value();
6269 // Make a dynamic relocation if necessary.
6270 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6272 if (!parameters
->options().output_is_position_independent()
6273 && gsym
->may_need_copy_reloc())
6275 target
->copy_reloc(symtab
, layout
, object
,
6276 data_shndx
, output_section
, gsym
, rela
);
6278 else if (r_type
== elfcpp::R_AARCH64_ABS64
6279 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6280 && gsym
->can_use_relative_reloc(false)
6281 && !gsym
->is_from_dynobj()
6282 && !gsym
->is_undefined()
6283 && !gsym
->is_preemptible())
6285 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6286 // symbol. This makes a function address in a PIE executable
6287 // match the address in a shared library that it links against.
6288 Reloc_section
* rela_dyn
=
6289 target
->rela_irelative_section(layout
);
6290 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6291 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6292 output_section
, object
,
6294 rela
.get_r_offset(),
6295 rela
.get_r_addend());
6297 else if (r_type
== elfcpp::R_AARCH64_ABS64
6298 && gsym
->can_use_relative_reloc(false))
6300 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6301 rela_dyn
->add_global_relative(gsym
,
6302 elfcpp::R_AARCH64_RELATIVE
,
6306 rela
.get_r_offset(),
6307 rela
.get_r_addend(),
6312 check_non_pic(object
, r_type
);
6313 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6314 rela_dyn
= target
->rela_dyn_section(layout
);
6315 rela_dyn
->add_global(
6316 gsym
, r_type
, output_section
, object
,
6317 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6323 case elfcpp::R_AARCH64_PREL16
:
6324 case elfcpp::R_AARCH64_PREL32
:
6325 case elfcpp::R_AARCH64_PREL64
:
6326 // This is used to fill the GOT absolute address.
6327 if (gsym
->needs_plt_entry())
6329 target
->make_plt_entry(symtab
, layout
, gsym
);
6333 case elfcpp::R_AARCH64_MOVW_UABS_G0
: // 263
6334 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
: // 264
6335 case elfcpp::R_AARCH64_MOVW_UABS_G1
: // 265
6336 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
: // 266
6337 case elfcpp::R_AARCH64_MOVW_UABS_G2
: // 267
6338 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
: // 268
6339 case elfcpp::R_AARCH64_MOVW_UABS_G3
: // 269
6340 case elfcpp::R_AARCH64_MOVW_SABS_G0
: // 270
6341 case elfcpp::R_AARCH64_MOVW_SABS_G1
: // 271
6342 case elfcpp::R_AARCH64_MOVW_SABS_G2
: // 272
6343 if (parameters
->options().output_is_position_independent())
6345 gold_error(_("%s: unsupported reloc %u in pos independent link."),
6346 object
->name().c_str(), r_type
);
6350 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6351 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6352 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6353 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6354 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6355 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6356 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6357 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6358 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6359 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6361 if (gsym
->needs_plt_entry())
6362 target
->make_plt_entry(symtab
, layout
, gsym
);
6363 // Make a dynamic relocation if necessary.
6364 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6366 if (parameters
->options().output_is_executable()
6367 && gsym
->may_need_copy_reloc())
6369 target
->copy_reloc(symtab
, layout
, object
,
6370 data_shndx
, output_section
, gsym
, rela
);
6376 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6377 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6378 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6380 // The above relocations are used to access GOT entries.
6381 // Note a GOT entry is an *address* to a symbol.
6382 // The symbol requires a GOT entry
6383 Output_data_got_aarch64
<size
, big_endian
>* got
=
6384 target
->got_section(symtab
, layout
);
6385 if (gsym
->final_value_is_known())
6387 // For a STT_GNU_IFUNC symbol we want the PLT address.
6388 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6389 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6391 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6395 // If this symbol is not fully resolved, we need to add a dynamic
6396 // relocation for it.
6397 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6399 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6401 // 1) The symbol may be defined in some other module.
6402 // 2) We are building a shared library and this is a protected
6403 // symbol; using GLOB_DAT means that the dynamic linker can use
6404 // the address of the PLT in the main executable when appropriate
6405 // so that function address comparisons work.
6406 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6407 // again so that function address comparisons work.
6408 if (gsym
->is_from_dynobj()
6409 || gsym
->is_undefined()
6410 || gsym
->is_preemptible()
6411 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6412 && parameters
->options().shared())
6413 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6414 && parameters
->options().output_is_position_independent()))
6415 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6416 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6419 // For a STT_GNU_IFUNC symbol we want to write the PLT
6420 // offset into the GOT, so that function pointer
6421 // comparisons work correctly.
6423 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6424 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6427 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6428 // Tell the dynamic linker to use the PLT address
6429 // when resolving relocations.
6430 if (gsym
->is_from_dynobj()
6431 && !parameters
->options().shared())
6432 gsym
->set_needs_dynsym_value();
6436 rela_dyn
->add_global_relative(
6437 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6439 gsym
->got_offset(GOT_TYPE_STANDARD
),
6448 case elfcpp::R_AARCH64_TSTBR14
:
6449 case elfcpp::R_AARCH64_CONDBR19
:
6450 case elfcpp::R_AARCH64_JUMP26
:
6451 case elfcpp::R_AARCH64_CALL26
:
6453 if (gsym
->final_value_is_known())
6456 if (gsym
->is_defined() &&
6457 !gsym
->is_from_dynobj() &&
6458 !gsym
->is_preemptible())
6461 // Make plt entry for function call.
6462 target
->make_plt_entry(symtab
, layout
, gsym
);
6466 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6467 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6469 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6470 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6471 if (tlsopt
== tls::TLSOPT_TO_LE
)
6473 layout
->set_has_static_tls();
6476 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6479 Output_data_got_aarch64
<size
, big_endian
>* got
=
6480 target
->got_section(symtab
, layout
);
6481 // Create 2 consecutive entries for module index and offset.
6482 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6483 target
->rela_dyn_section(layout
),
6484 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6485 elfcpp::R_AARCH64_TLS_DTPREL64
);
6489 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6490 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6492 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6493 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6494 if (tlsopt
== tls::TLSOPT_NONE
)
6496 // Create a GOT entry for the module index.
6497 target
->got_mod_index_entry(symtab
, layout
, object
);
6499 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6500 unsupported_reloc_local(object
, r_type
);
6504 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6505 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6506 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6507 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6510 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6511 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6513 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6514 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6515 if (tlsopt
== tls::TLSOPT_TO_LE
)
6518 layout
->set_has_static_tls();
6519 // Create a GOT entry for the tp-relative offset.
6520 Output_data_got_aarch64
<size
, big_endian
>* got
6521 = target
->got_section(symtab
, layout
);
6522 if (!parameters
->doing_static_link())
6524 got
->add_global_with_rel(
6525 gsym
, GOT_TYPE_TLS_OFFSET
,
6526 target
->rela_dyn_section(layout
),
6527 elfcpp::R_AARCH64_TLS_TPREL64
);
6529 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6531 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6532 unsigned int got_offset
=
6533 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6534 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6535 gold_assert(addend
== 0);
6536 got
->add_static_reloc(got_offset
,
6537 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6542 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6543 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6544 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6545 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6546 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6547 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6548 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6549 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6550 layout
->set_has_static_tls();
6551 if (parameters
->options().shared())
6552 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6553 object
->name().c_str(), r_type
);
6556 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6557 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6558 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6560 target
->define_tls_base_symbol(symtab
, layout
);
6561 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6562 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6563 if (tlsopt
== tls::TLSOPT_NONE
)
6565 // Create reserved PLT and GOT entries for the resolver.
6566 target
->reserve_tlsdesc_entries(symtab
, layout
);
6568 // Create a double GOT entry with an R_AARCH64_TLSDESC
6569 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6570 // entry needs to be in an area in .got.plt, not .got. Call
6571 // got_section to make sure the section has been created.
6572 target
->got_section(symtab
, layout
);
6573 Output_data_got
<size
, big_endian
>* got
=
6574 target
->got_tlsdesc_section();
6575 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6576 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6577 elfcpp::R_AARCH64_TLSDESC
, 0);
6579 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6581 // Create a GOT entry for the tp-relative offset.
6582 Output_data_got
<size
, big_endian
>* got
6583 = target
->got_section(symtab
, layout
);
6584 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6585 target
->rela_dyn_section(layout
),
6586 elfcpp::R_AARCH64_TLS_TPREL64
);
6588 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6589 unsupported_reloc_global(object
, r_type
, gsym
);
6593 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6597 gold_error(_("%s: unsupported reloc type in global scan"),
6598 aarch64_reloc_property_table
->
6599 reloc_name_in_error_message(r_type
).c_str());
6602 } // End of Scan::global
6605 // Create the PLT section.
6606 template<int size
, bool big_endian
>
6608 Target_aarch64
<size
, big_endian
>::make_plt_section(
6609 Symbol_table
* symtab
, Layout
* layout
)
6611 if (this->plt_
== NULL
)
6613 // Create the GOT section first.
6614 this->got_section(symtab
, layout
);
6616 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6617 this->got_irelative_
);
6619 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6621 | elfcpp::SHF_EXECINSTR
),
6622 this->plt_
, ORDER_PLT
, false);
6624 // Make the sh_info field of .rela.plt point to .plt.
6625 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6626 rela_plt_os
->set_info_section(this->plt_
->output_section());
6630 // Return the section for TLSDESC relocations.
6632 template<int size
, bool big_endian
>
6633 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6634 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6636 return this->plt_section()->rela_tlsdesc(layout
);
6639 // Create a PLT entry for a global symbol.
6641 template<int size
, bool big_endian
>
6643 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6644 Symbol_table
* symtab
,
6648 if (gsym
->has_plt_offset())
6651 if (this->plt_
== NULL
)
6652 this->make_plt_section(symtab
, layout
);
6654 this->plt_
->add_entry(symtab
, layout
, gsym
);
6657 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6659 template<int size
, bool big_endian
>
6661 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6662 Symbol_table
* symtab
, Layout
* layout
,
6663 Sized_relobj_file
<size
, big_endian
>* relobj
,
6664 unsigned int local_sym_index
)
6666 if (relobj
->local_has_plt_offset(local_sym_index
))
6668 if (this->plt_
== NULL
)
6669 this->make_plt_section(symtab
, layout
);
6670 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6673 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6676 template<int size
, bool big_endian
>
6678 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6679 Symbol_table
* symtab
,
6681 Sized_relobj_file
<size
, big_endian
>* object
,
6682 unsigned int data_shndx
,
6683 unsigned int sh_type
,
6684 const unsigned char* prelocs
,
6686 Output_section
* output_section
,
6687 bool needs_special_offset_handling
,
6688 size_t local_symbol_count
,
6689 const unsigned char* plocal_symbols
)
6691 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6692 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6695 if (sh_type
== elfcpp::SHT_REL
)
6700 gold::gc_process_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6709 needs_special_offset_handling
,
6714 // Scan relocations for a section.
6716 template<int size
, bool big_endian
>
6718 Target_aarch64
<size
, big_endian
>::scan_relocs(
6719 Symbol_table
* symtab
,
6721 Sized_relobj_file
<size
, big_endian
>* object
,
6722 unsigned int data_shndx
,
6723 unsigned int sh_type
,
6724 const unsigned char* prelocs
,
6726 Output_section
* output_section
,
6727 bool needs_special_offset_handling
,
6728 size_t local_symbol_count
,
6729 const unsigned char* plocal_symbols
)
6731 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
6732 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
6735 if (sh_type
== elfcpp::SHT_REL
)
6737 gold_error(_("%s: unsupported REL reloc section"),
6738 object
->name().c_str());
6742 gold::scan_relocs
<size
, big_endian
, Aarch64
, Scan
, Classify_reloc
>(
6751 needs_special_offset_handling
,
6756 // Return the value to use for a dynamic which requires special
6757 // treatment. This is how we support equality comparisons of function
6758 // pointers across shared library boundaries, as described in the
6759 // processor specific ABI supplement.
6761 template<int size
, bool big_endian
>
6763 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6765 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6766 return this->plt_address_for_global(gsym
);
6770 // Finalize the sections.
6772 template<int size
, bool big_endian
>
6774 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6776 const Input_objects
*,
6777 Symbol_table
* symtab
)
6779 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6781 : this->plt_
->rela_plt());
6782 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6783 this->rela_dyn_
, true, false);
6785 // Emit any relocs we saved in an attempt to avoid generating COPY
6787 if (this->copy_relocs_
.any_saved_relocs())
6788 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6790 // Fill in some more dynamic tags.
6791 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6794 if (this->plt_
!= NULL
6795 && this->plt_
->output_section() != NULL
6796 && this->plt_
->has_tlsdesc_entry())
6798 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6799 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6800 this->got_
->finalize_data_size();
6801 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6802 this->plt_
, plt_offset
);
6803 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6804 this->got_
, got_offset
);
6808 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6809 // the .got.plt section.
6810 Symbol
* sym
= this->global_offset_table_
;
6813 uint64_t data_size
= this->got_plt_
->current_data_size();
6814 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6816 // If the .got section is more than 0x8000 bytes, we add
6817 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6818 // bit relocations have a greater chance of working.
6819 if (data_size
>= 0x8000)
6820 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6821 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6824 if (parameters
->doing_static_link()
6825 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6827 // If linking statically, make sure that the __rela_iplt symbols
6828 // were defined if necessary, even if we didn't create a PLT.
6829 static const Define_symbol_in_segment syms
[] =
6832 "__rela_iplt_start", // name
6833 elfcpp::PT_LOAD
, // segment_type
6834 elfcpp::PF_W
, // segment_flags_set
6835 elfcpp::PF(0), // segment_flags_clear
6838 elfcpp::STT_NOTYPE
, // type
6839 elfcpp::STB_GLOBAL
, // binding
6840 elfcpp::STV_HIDDEN
, // visibility
6842 Symbol::SEGMENT_START
, // offset_from_base
6846 "__rela_iplt_end", // name
6847 elfcpp::PT_LOAD
, // segment_type
6848 elfcpp::PF_W
, // segment_flags_set
6849 elfcpp::PF(0), // segment_flags_clear
6852 elfcpp::STT_NOTYPE
, // type
6853 elfcpp::STB_GLOBAL
, // binding
6854 elfcpp::STV_HIDDEN
, // visibility
6856 Symbol::SEGMENT_START
, // offset_from_base
6861 symtab
->define_symbols(layout
, 2, syms
,
6862 layout
->script_options()->saw_sections_clause());
6868 // Perform a relocation.
6870 template<int size
, bool big_endian
>
6872 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
6873 const Relocate_info
<size
, big_endian
>* relinfo
,
6875 Target_aarch64
<size
, big_endian
>* target
,
6878 const unsigned char* preloc
,
6879 const Sized_symbol
<size
>* gsym
,
6880 const Symbol_value
<size
>* psymval
,
6881 unsigned char* view
,
6882 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
6883 section_size_type
/* view_size */)
6888 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
6890 const elfcpp::Rela
<size
, big_endian
> rela(preloc
);
6891 unsigned int r_type
= elfcpp::elf_r_type
<size
>(rela
.get_r_info());
6892 const AArch64_reloc_property
* reloc_property
=
6893 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6895 if (reloc_property
== NULL
)
6897 std::string reloc_name
=
6898 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
6899 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6900 _("cannot relocate %s in object file"),
6901 reloc_name
.c_str());
6905 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6907 // Pick the value to use for symbols defined in the PLT.
6908 Symbol_value
<size
> symval
;
6910 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
6912 symval
.set_output_value(target
->plt_address_for_global(gsym
));
6915 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
6917 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6918 if (object
->local_has_plt_offset(r_sym
))
6920 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
6925 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6927 // Get the GOT offset if needed.
6928 // For aarch64, the GOT pointer points to the start of the GOT section.
6929 bool have_got_offset
= false;
6931 int got_base
= (target
->got_
!= NULL
6932 ? (target
->got_
->current_data_size() >= 0x8000
6937 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
6938 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
6939 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
6940 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
6941 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
6942 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
6943 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
6944 case elfcpp::R_AARCH64_GOTREL64
:
6945 case elfcpp::R_AARCH64_GOTREL32
:
6946 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
6947 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
6948 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6949 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6950 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6953 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
6954 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
6958 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6959 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
6960 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
6963 have_got_offset
= true;
6970 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
6971 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
6974 case elfcpp::R_AARCH64_NONE
:
6977 case elfcpp::R_AARCH64_ABS64
:
6978 if (!parameters
->options().apply_dynamic_relocs()
6979 && parameters
->options().output_is_position_independent()
6981 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags())
6982 && !gsym
->can_use_relative_reloc(false))
6983 // We have generated an absolute dynamic relocation, so do not
6984 // apply the relocation statically. (Works around bugs in older
6985 // Android dynamic linkers.)
6987 reloc_status
= Reloc::template rela_ua
<64>(
6988 view
, object
, psymval
, addend
, reloc_property
);
6991 case elfcpp::R_AARCH64_ABS32
:
6992 if (!parameters
->options().apply_dynamic_relocs()
6993 && parameters
->options().output_is_position_independent()
6995 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
6996 // We have generated an absolute dynamic relocation, so do not
6997 // apply the relocation statically. (Works around bugs in older
6998 // Android dynamic linkers.)
7000 reloc_status
= Reloc::template rela_ua
<32>(
7001 view
, object
, psymval
, addend
, reloc_property
);
7004 case elfcpp::R_AARCH64_ABS16
:
7005 if (!parameters
->options().apply_dynamic_relocs()
7006 && parameters
->options().output_is_position_independent()
7008 && gsym
->needs_dynamic_reloc(reloc_property
->reference_flags()))
7009 // We have generated an absolute dynamic relocation, so do not
7010 // apply the relocation statically. (Works around bugs in older
7011 // Android dynamic linkers.)
7013 reloc_status
= Reloc::template rela_ua
<16>(
7014 view
, object
, psymval
, addend
, reloc_property
);
7017 case elfcpp::R_AARCH64_PREL64
:
7018 reloc_status
= Reloc::template pcrela_ua
<64>(
7019 view
, object
, psymval
, addend
, address
, reloc_property
);
7022 case elfcpp::R_AARCH64_PREL32
:
7023 reloc_status
= Reloc::template pcrela_ua
<32>(
7024 view
, object
, psymval
, addend
, address
, reloc_property
);
7027 case elfcpp::R_AARCH64_PREL16
:
7028 reloc_status
= Reloc::template pcrela_ua
<16>(
7029 view
, object
, psymval
, addend
, address
, reloc_property
);
7032 case elfcpp::R_AARCH64_MOVW_UABS_G0
:
7033 case elfcpp::R_AARCH64_MOVW_UABS_G0_NC
:
7034 case elfcpp::R_AARCH64_MOVW_UABS_G1
:
7035 case elfcpp::R_AARCH64_MOVW_UABS_G1_NC
:
7036 case elfcpp::R_AARCH64_MOVW_UABS_G2
:
7037 case elfcpp::R_AARCH64_MOVW_UABS_G2_NC
:
7038 case elfcpp::R_AARCH64_MOVW_UABS_G3
:
7039 reloc_status
= Reloc::template rela_general
<32>(
7040 view
, object
, psymval
, addend
, reloc_property
);
7042 case elfcpp::R_AARCH64_MOVW_SABS_G0
:
7043 case elfcpp::R_AARCH64_MOVW_SABS_G1
:
7044 case elfcpp::R_AARCH64_MOVW_SABS_G2
:
7045 reloc_status
= Reloc::movnz(view
, psymval
->value(object
, addend
),
7049 case elfcpp::R_AARCH64_LD_PREL_LO19
:
7050 reloc_status
= Reloc::template pcrela_general
<32>(
7051 view
, object
, psymval
, addend
, address
, reloc_property
);
7054 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
7055 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
7056 address
, reloc_property
);
7059 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
7060 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
7061 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
7065 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
7066 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
7067 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
7068 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
7069 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
7070 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
7071 reloc_status
= Reloc::template rela_general
<32>(
7072 view
, object
, psymval
, addend
, reloc_property
);
7075 case elfcpp::R_AARCH64_CALL26
:
7076 if (this->skip_call_tls_get_addr_
)
7078 // Double check that the TLSGD insn has been optimized away.
7079 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7080 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
7081 reinterpret_cast<Insntype
*>(view
));
7082 gold_assert((insn
& 0xff000000) == 0x91000000);
7084 reloc_status
= Reloc::STATUS_OKAY
;
7085 this->skip_call_tls_get_addr_
= false;
7086 // Return false to stop further processing this reloc.
7090 case elfcpp::R_AARCH64_JUMP26
:
7091 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
7092 gsym
, psymval
, object
,
7093 target
->stub_group_size_
))
7096 case elfcpp::R_AARCH64_TSTBR14
:
7097 case elfcpp::R_AARCH64_CONDBR19
:
7098 reloc_status
= Reloc::template pcrela_general
<32>(
7099 view
, object
, psymval
, addend
, address
, reloc_property
);
7102 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
7103 gold_assert(have_got_offset
);
7104 value
= target
->got_
->address() + got_base
+ got_offset
;
7105 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
7108 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
7109 gold_assert(have_got_offset
);
7110 value
= target
->got_
->address() + got_base
+ got_offset
;
7111 reloc_status
= Reloc::template rela_general
<32>(
7112 view
, value
, addend
, reloc_property
);
7115 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
7117 gold_assert(have_got_offset
);
7118 value
= target
->got_
->address() + got_base
+ got_offset
+ addend
-
7119 Reloc::Page(target
->got_
->address() + got_base
);
7120 if ((value
& 7) != 0)
7121 reloc_status
= Reloc::STATUS_OVERFLOW
;
7123 reloc_status
= Reloc::template reloc_common
<32>(
7124 view
, value
, reloc_property
);
7128 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7129 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7130 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7131 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7132 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7133 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7134 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7135 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7136 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7137 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7138 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7139 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7140 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7141 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7142 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7143 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7144 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7145 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7146 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7147 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7148 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7149 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7150 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
7151 gsym
, psymval
, view
, address
);
7154 // These are dynamic relocations, which are unexpected when linking.
7155 case elfcpp::R_AARCH64_COPY
:
7156 case elfcpp::R_AARCH64_GLOB_DAT
:
7157 case elfcpp::R_AARCH64_JUMP_SLOT
:
7158 case elfcpp::R_AARCH64_RELATIVE
:
7159 case elfcpp::R_AARCH64_IRELATIVE
:
7160 case elfcpp::R_AARCH64_TLS_DTPREL64
:
7161 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
7162 case elfcpp::R_AARCH64_TLS_TPREL64
:
7163 case elfcpp::R_AARCH64_TLSDESC
:
7164 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7165 _("unexpected reloc %u in object file"),
7170 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7171 _("unsupported reloc %s"),
7172 reloc_property
->name().c_str());
7176 // Report any errors.
7177 switch (reloc_status
)
7179 case Reloc::STATUS_OKAY
:
7181 case Reloc::STATUS_OVERFLOW
:
7182 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7183 _("relocation overflow in %s"),
7184 reloc_property
->name().c_str());
7186 case Reloc::STATUS_BAD_RELOC
:
7187 gold_error_at_location(
7190 rela
.get_r_offset(),
7191 _("unexpected opcode while processing relocation %s"),
7192 reloc_property
->name().c_str());
7202 template<int size
, bool big_endian
>
7204 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7205 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
7206 const Relocate_info
<size
, big_endian
>* relinfo
,
7207 Target_aarch64
<size
, big_endian
>* target
,
7209 const elfcpp::Rela
<size
, big_endian
>& rela
,
7210 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
7211 const Symbol_value
<size
>* psymval
,
7212 unsigned char* view
,
7213 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7215 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7216 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7218 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7219 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7220 const AArch64_reloc_property
* reloc_property
=
7221 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7222 gold_assert(reloc_property
!= NULL
);
7224 const bool is_final
= (gsym
== NULL
7225 ? !parameters
->options().shared()
7226 : gsym
->final_value_is_known());
7227 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
7228 optimize_tls_reloc(is_final
, r_type
);
7230 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7231 int tls_got_offset_type
;
7234 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7235 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
7237 if (tlsopt
== tls::TLSOPT_TO_LE
)
7239 if (tls_segment
== NULL
)
7241 gold_assert(parameters
->errors()->error_count() > 0
7242 || issue_undefined_symbol_error(gsym
));
7243 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7245 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
7248 else if (tlsopt
== tls::TLSOPT_NONE
)
7250 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
7251 // Firstly get the address for the got entry.
7252 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7255 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7256 got_entry_address
= target
->got_
->address() +
7257 gsym
->got_offset(tls_got_offset_type
);
7261 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7263 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7264 got_entry_address
= target
->got_
->address() +
7265 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7268 // Relocate the address into adrp/ld, adrp/add pair.
7271 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7272 return aarch64_reloc_funcs::adrp(
7273 view
, got_entry_address
+ addend
, address
);
7277 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7278 return aarch64_reloc_funcs::template rela_general
<32>(
7279 view
, got_entry_address
, addend
, reloc_property
);
7286 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7287 _("unsupported gd_to_ie relaxation on %u"),
7292 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7293 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7295 if (tlsopt
== tls::TLSOPT_TO_LE
)
7297 if (tls_segment
== NULL
)
7299 gold_assert(parameters
->errors()->error_count() > 0
7300 || issue_undefined_symbol_error(gsym
));
7301 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7303 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7307 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7308 // Relocate the field with the offset of the GOT entry for
7309 // the module index.
7310 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7311 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7312 target
->got_
->address());
7316 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7317 return aarch64_reloc_funcs::adrp(
7318 view
, got_entry_address
+ addend
, address
);
7321 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7322 return aarch64_reloc_funcs::template rela_general
<32>(
7323 view
, got_entry_address
, addend
, reloc_property
);
7332 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7333 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7334 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7335 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7337 AArch64_address value
= psymval
->value(object
, 0);
7338 if (tlsopt
== tls::TLSOPT_TO_LE
)
7340 if (tls_segment
== NULL
)
7342 gold_assert(parameters
->errors()->error_count() > 0
7343 || issue_undefined_symbol_error(gsym
));
7344 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7349 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7350 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7354 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7355 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7356 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7357 return aarch64_reloc_funcs::template rela_general
<32>(
7358 view
, value
, addend
, reloc_property
);
7364 // We should never reach here.
7368 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7369 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7371 if (tlsopt
== tls::TLSOPT_TO_LE
)
7373 if (tls_segment
== NULL
)
7375 gold_assert(parameters
->errors()->error_count() > 0
7376 || issue_undefined_symbol_error(gsym
));
7377 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7379 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7382 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7384 // Firstly get the address for the got entry.
7385 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7388 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7389 got_entry_address
= target
->got_
->address() +
7390 gsym
->got_offset(tls_got_offset_type
);
7394 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7396 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7397 got_entry_address
= target
->got_
->address() +
7398 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7400 // Relocate the address into adrp/ld, adrp/add pair.
7403 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7404 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7407 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7408 return aarch64_reloc_funcs::template rela_general
<32>(
7409 view
, got_entry_address
, addend
, reloc_property
);
7414 // We shall never reach here.
7417 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7418 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7419 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7420 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7421 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7422 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7423 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7424 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7426 gold_assert(tls_segment
!= NULL
);
7427 AArch64_address value
= psymval
->value(object
, 0);
7429 if (!parameters
->options().shared())
7431 AArch64_address aligned_tcb_size
=
7432 align_address(target
->tcb_size(),
7433 tls_segment
->maximum_alignment());
7434 value
+= aligned_tcb_size
;
7437 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7438 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7439 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7440 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7443 return aarch64_reloc_funcs::template
7444 rela_general
<32>(view
,
7451 gold_error(_("%s: unsupported reloc %u "
7452 "in non-static TLSLE mode."),
7453 object
->name().c_str(), r_type
);
7457 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7458 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7459 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7460 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7462 if (tlsopt
== tls::TLSOPT_TO_LE
)
7464 if (tls_segment
== NULL
)
7466 gold_assert(parameters
->errors()->error_count() > 0
7467 || issue_undefined_symbol_error(gsym
));
7468 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7470 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7475 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7476 ? GOT_TYPE_TLS_OFFSET
7477 : GOT_TYPE_TLS_DESC
);
7478 unsigned int got_tlsdesc_offset
= 0;
7479 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7480 && tlsopt
== tls::TLSOPT_NONE
)
7482 // We created GOT entries in the .got.tlsdesc portion of the
7483 // .got.plt section, but the offset stored in the symbol is the
7484 // offset within .got.tlsdesc.
7485 got_tlsdesc_offset
= (target
->got_
->data_size()
7486 + target
->got_plt_section()->data_size());
7488 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7491 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7492 got_entry_address
= target
->got_
->address()
7493 + got_tlsdesc_offset
7494 + gsym
->got_offset(tls_got_offset_type
);
7498 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7500 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7501 got_entry_address
= target
->got_
->address() +
7502 got_tlsdesc_offset
+
7503 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7505 if (tlsopt
== tls::TLSOPT_TO_IE
)
7507 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7508 view
, psymval
, got_entry_address
,
7512 // Now do tlsdesc relocation.
7515 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7516 return aarch64_reloc_funcs::adrp(view
,
7517 got_entry_address
+ addend
,
7520 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7521 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7522 return aarch64_reloc_funcs::template rela_general
<32>(
7523 view
, got_entry_address
, addend
, reloc_property
);
7525 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7526 return aarch64_reloc_funcs::STATUS_OKAY
;
7536 gold_error(_("%s: unsupported TLS reloc %u."),
7537 object
->name().c_str(), r_type
);
7539 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7540 } // End of relocate_tls.
7543 template<int size
, bool big_endian
>
7545 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7546 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7547 const Relocate_info
<size
, big_endian
>* relinfo
,
7548 Target_aarch64
<size
, big_endian
>* target
,
7549 const elfcpp::Rela
<size
, big_endian
>& rela
,
7550 unsigned int r_type
,
7551 unsigned char* view
,
7552 const Symbol_value
<size
>* psymval
)
7554 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7555 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7556 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7558 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7559 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7560 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7561 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7563 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7565 // This is the 2nd relocs, optimization should already have been
7567 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7568 return aarch64_reloc_funcs::STATUS_OKAY
;
7571 // The original sequence is -
7572 // 90000000 adrp x0, 0 <main>
7573 // 91000000 add x0, x0, #0x0
7574 // 94000000 bl 0 <__tls_get_addr>
7575 // optimized to sequence -
7576 // d53bd040 mrs x0, tpidr_el0
7577 // 91400000 add x0, x0, #0x0, lsl #12
7578 // 91000000 add x0, x0, #0x0
7580 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7581 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7582 // have to change "bl tls_get_addr", which does not have a corresponding tls
7583 // relocation type. So before proceeding, we need to make sure compiler
7584 // does not change the sequence.
7585 if(!(insn1
== 0x90000000 // adrp x0,0
7586 && insn2
== 0x91000000 // add x0, x0, #0x0
7587 && insn3
== 0x94000000)) // bl 0
7589 // Ideally we should give up gd_to_le relaxation and do gd access.
7590 // However the gd_to_le relaxation decision has been made early
7591 // in the scan stage, where we did not allocate any GOT entry for
7592 // this symbol. Therefore we have to exit and report error now.
7593 gold_error(_("unexpected reloc insn sequence while relaxing "
7594 "tls gd to le for reloc %u."), r_type
);
7595 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7599 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7600 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7601 insn3
= 0x91000000; // add x0, x0, #0x0
7602 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7603 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7604 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7606 // Calculate tprel value.
7607 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7608 gold_assert(tls_segment
!= NULL
);
7609 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7610 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7611 AArch64_address aligned_tcb_size
=
7612 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7613 AArch64_address x
= value
+ aligned_tcb_size
;
7615 // After new insns are written, apply TLSLE relocs.
7616 const AArch64_reloc_property
* rp1
=
7617 aarch64_reloc_property_table
->get_reloc_property(
7618 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7619 const AArch64_reloc_property
* rp2
=
7620 aarch64_reloc_property_table
->get_reloc_property(
7621 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7622 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7624 typename
aarch64_reloc_funcs::Status s1
=
7625 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7629 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7632 typename
aarch64_reloc_funcs::Status s2
=
7633 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7638 this->skip_call_tls_get_addr_
= true;
7640 } // End of tls_gd_to_le
7643 template<int size
, bool big_endian
>
7645 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7646 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7647 const Relocate_info
<size
, big_endian
>* relinfo
,
7648 Target_aarch64
<size
, big_endian
>* target
,
7649 const elfcpp::Rela
<size
, big_endian
>& rela
,
7650 unsigned int r_type
,
7651 unsigned char* view
,
7652 const Symbol_value
<size
>* psymval
)
7654 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7655 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7656 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7658 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7659 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7660 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7661 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7663 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7665 // This is the 2nd relocs, optimization should already have been
7667 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7668 return aarch64_reloc_funcs::STATUS_OKAY
;
7671 // The original sequence is -
7672 // 90000000 adrp x0, 0 <main>
7673 // 91000000 add x0, x0, #0x0
7674 // 94000000 bl 0 <__tls_get_addr>
7675 // optimized to sequence -
7676 // d53bd040 mrs x0, tpidr_el0
7677 // 91400000 add x0, x0, #0x0, lsl #12
7678 // 91000000 add x0, x0, #0x0
7680 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7681 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7682 // have to change "bl tls_get_addr", which does not have a corresponding tls
7683 // relocation type. So before proceeding, we need to make sure compiler
7684 // does not change the sequence.
7685 if(!(insn1
== 0x90000000 // adrp x0,0
7686 && insn2
== 0x91000000 // add x0, x0, #0x0
7687 && insn3
== 0x94000000)) // bl 0
7689 // Ideally we should give up gd_to_le relaxation and do gd access.
7690 // However the gd_to_le relaxation decision has been made early
7691 // in the scan stage, where we did not allocate any GOT entry for
7692 // this symbol. Therefore we have to exit and report error now.
7693 gold_error(_("unexpected reloc insn sequence while relaxing "
7694 "tls gd to le for reloc %u."), r_type
);
7695 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7699 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7700 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7701 insn3
= 0x91000000; // add x0, x0, #0x0
7702 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7703 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7704 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7706 // Calculate tprel value.
7707 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7708 gold_assert(tls_segment
!= NULL
);
7709 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7710 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7711 AArch64_address aligned_tcb_size
=
7712 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7713 AArch64_address x
= value
+ aligned_tcb_size
;
7715 // After new insns are written, apply TLSLE relocs.
7716 const AArch64_reloc_property
* rp1
=
7717 aarch64_reloc_property_table
->get_reloc_property(
7718 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7719 const AArch64_reloc_property
* rp2
=
7720 aarch64_reloc_property_table
->get_reloc_property(
7721 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7722 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7724 typename
aarch64_reloc_funcs::Status s1
=
7725 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7729 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7732 typename
aarch64_reloc_funcs::Status s2
=
7733 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7738 this->skip_call_tls_get_addr_
= true;
7741 } // End of tls_ld_to_le
7743 template<int size
, bool big_endian
>
7745 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7746 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7747 const Relocate_info
<size
, big_endian
>* relinfo
,
7748 Target_aarch64
<size
, big_endian
>* target
,
7749 const elfcpp::Rela
<size
, big_endian
>& rela
,
7750 unsigned int r_type
,
7751 unsigned char* view
,
7752 const Symbol_value
<size
>* psymval
)
7754 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7755 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7756 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7758 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7759 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7760 AArch64_address aligned_tcb_address
=
7761 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7762 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7763 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7764 // "x" is the offset to tp, we can only do this if x is within
7765 // range [0, 2^32-1]
7766 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7768 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7770 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7773 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7774 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7777 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7780 regno
= (insn
& 0x1f);
7781 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7783 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7786 regno
= (insn
& 0x1f);
7787 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7788 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7793 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7794 return aarch64_reloc_funcs::STATUS_OKAY
;
7795 } // End of tls_ie_to_le
7798 template<int size
, bool big_endian
>
7800 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7801 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7802 const Relocate_info
<size
, big_endian
>* relinfo
,
7803 Target_aarch64
<size
, big_endian
>* target
,
7804 const elfcpp::Rela
<size
, big_endian
>& rela
,
7805 unsigned int r_type
,
7806 unsigned char* view
,
7807 const Symbol_value
<size
>* psymval
)
7809 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7810 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7811 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7813 // TLSDESC-GD sequence is like:
7814 // adrp x0, :tlsdesc:v1
7815 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7816 // add x0, x0, :tlsdesc_lo12:v1
7819 // After desc_gd_to_le optimization, the sequence will be like:
7820 // movz x0, #0x0, lsl #16
7825 // Calculate tprel value.
7826 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7827 gold_assert(tls_segment
!= NULL
);
7828 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7829 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7830 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7831 AArch64_address aligned_tcb_size
=
7832 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7833 AArch64_address x
= value
+ aligned_tcb_size
;
7834 // x is the offset to tp, we can only do this if x is within range
7835 // [0, 2^32-1]. If x is out of range, fail and exit.
7836 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7838 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7839 "We Can't do gd_to_le relaxation.\n"), r_type
);
7840 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7845 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7846 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7848 newinsn
= 0xd503201f;
7851 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7853 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7856 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7858 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7862 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7866 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7867 return aarch64_reloc_funcs::STATUS_OKAY
;
7868 } // End of tls_desc_gd_to_le
7871 template<int size
, bool big_endian
>
7873 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7874 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
7875 const Relocate_info
<size
, big_endian
>* /* relinfo */,
7876 Target_aarch64
<size
, big_endian
>* /* target */,
7877 const elfcpp::Rela
<size
, big_endian
>& rela
,
7878 unsigned int r_type
,
7879 unsigned char* view
,
7880 const Symbol_value
<size
>* /* psymval */,
7881 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
7882 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7884 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7885 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7887 // TLSDESC-GD sequence is like:
7888 // adrp x0, :tlsdesc:v1
7889 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7890 // add x0, x0, :tlsdesc_lo12:v1
7893 // After desc_gd_to_ie optimization, the sequence will be like:
7894 // adrp x0, :tlsie:v1
7895 // ldr x0, [x0, :tlsie_lo12:v1]
7899 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7900 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7904 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7905 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7907 newinsn
= 0xd503201f;
7908 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7911 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7913 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7918 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7920 // Set ldr target register to be x0.
7921 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7923 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
7925 const AArch64_reloc_property
* reloc_property
=
7926 aarch64_reloc_property_table
->get_reloc_property(
7927 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
7928 return aarch64_reloc_funcs::template rela_general
<32>(
7929 view
, got_entry_address
, addend
, reloc_property
);
7934 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7938 return aarch64_reloc_funcs::STATUS_OKAY
;
7939 } // End of tls_desc_gd_to_ie
7941 // Relocate section data.
7943 template<int size
, bool big_endian
>
7945 Target_aarch64
<size
, big_endian
>::relocate_section(
7946 const Relocate_info
<size
, big_endian
>* relinfo
,
7947 unsigned int sh_type
,
7948 const unsigned char* prelocs
,
7950 Output_section
* output_section
,
7951 bool needs_special_offset_handling
,
7952 unsigned char* view
,
7953 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
7954 section_size_type view_size
,
7955 const Reloc_symbol_changes
* reloc_symbol_changes
)
7957 typedef Target_aarch64
<size
, big_endian
> Aarch64
;
7958 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
7959 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
7962 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7964 gold::relocate_section
<size
, big_endian
, Aarch64
, AArch64_relocate
,
7965 gold::Default_comdat_behavior
, Classify_reloc
>(
7971 needs_special_offset_handling
,
7975 reloc_symbol_changes
);
7978 // Scan the relocs during a relocatable link.
7980 template<int size
, bool big_endian
>
7982 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
7983 Symbol_table
* symtab
,
7985 Sized_relobj_file
<size
, big_endian
>* object
,
7986 unsigned int data_shndx
,
7987 unsigned int sh_type
,
7988 const unsigned char* prelocs
,
7990 Output_section
* output_section
,
7991 bool needs_special_offset_handling
,
7992 size_t local_symbol_count
,
7993 const unsigned char* plocal_symbols
,
7994 Relocatable_relocs
* rr
)
7996 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
7998 typedef gold::Default_scan_relocatable_relocs
<Classify_reloc
>
7999 Scan_relocatable_relocs
;
8001 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8003 gold::scan_relocatable_relocs
<size
, big_endian
, Scan_relocatable_relocs
>(
8011 needs_special_offset_handling
,
8017 // Scan the relocs for --emit-relocs.
8019 template<int size
, bool big_endian
>
8021 Target_aarch64
<size
, big_endian
>::emit_relocs_scan(
8022 Symbol_table
* symtab
,
8024 Sized_relobj_file
<size
, big_endian
>* object
,
8025 unsigned int data_shndx
,
8026 unsigned int sh_type
,
8027 const unsigned char* prelocs
,
8029 Output_section
* output_section
,
8030 bool needs_special_offset_handling
,
8031 size_t local_symbol_count
,
8032 const unsigned char* plocal_syms
,
8033 Relocatable_relocs
* rr
)
8035 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8037 typedef gold::Default_emit_relocs_strategy
<Classify_reloc
>
8038 Emit_relocs_strategy
;
8040 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8042 gold::scan_relocatable_relocs
<size
, big_endian
, Emit_relocs_strategy
>(
8050 needs_special_offset_handling
,
8056 // Relocate a section during a relocatable link.
8058 template<int size
, bool big_endian
>
8060 Target_aarch64
<size
, big_endian
>::relocate_relocs(
8061 const Relocate_info
<size
, big_endian
>* relinfo
,
8062 unsigned int sh_type
,
8063 const unsigned char* prelocs
,
8065 Output_section
* output_section
,
8066 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
8067 unsigned char* view
,
8068 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
8069 section_size_type view_size
,
8070 unsigned char* reloc_view
,
8071 section_size_type reloc_view_size
)
8073 typedef gold::Default_classify_reloc
<elfcpp::SHT_RELA
, size
, big_endian
>
8076 gold_assert(sh_type
== elfcpp::SHT_RELA
);
8078 gold::relocate_relocs
<size
, big_endian
, Classify_reloc
>(
8083 offset_in_output_section
,
8092 // Return whether this is a 3-insn erratum sequence.
8094 template<int size
, bool big_endian
>
8096 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
8097 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8098 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
8099 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
8104 // The 2nd insn is a single register load or store; or register pair
8106 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
8107 && (!pair
|| (pair
&& !load
)))
8109 // The 3rd insn is a load or store instruction from the "Load/store
8110 // register (unsigned immediate)" encoding class, using Rn as the
8111 // base address register.
8112 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
8113 && (Insn_utilities::aarch64_rn(insn3
)
8114 == Insn_utilities::aarch64_rd(insn1
)))
8121 // Return whether this is a 835769 sequence.
8122 // (Similarly implemented as in elfnn-aarch64.c.)
8124 template<int size
, bool big_endian
>
8126 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
8127 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
8128 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
8138 if (Insn_utilities::aarch64_mlxl(insn2
)
8139 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
8141 /* Any SIMD memory op is independent of the subsequent MLA
8142 by definition of the erratum. */
8143 if (Insn_utilities::aarch64_bit(insn1
, 26))
8146 /* If not SIMD, check for integer memory ops and MLA relationship. */
8147 rn
= Insn_utilities::aarch64_rn(insn2
);
8148 ra
= Insn_utilities::aarch64_ra(insn2
);
8149 rm
= Insn_utilities::aarch64_rm(insn2
);
8151 /* If this is a load and there's a true(RAW) dependency, we are safe
8152 and this is not an erratum sequence. */
8154 (rt
== rn
|| rt
== rm
|| rt
== ra
8155 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
8158 /* We conservatively put out stubs for all other cases (including
8167 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8169 template<int size
, bool big_endian
>
8171 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
8172 AArch64_relobj
<size
, big_endian
>* relobj
,
8174 section_size_type erratum_insn_offset
,
8175 Address erratum_address
,
8176 typename
Insn_utilities::Insntype erratum_insn
,
8178 unsigned int e843419_adrp_offset
)
8180 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
8181 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
8182 gold_assert(stub_table
!= NULL
);
8183 if (stub_table
->find_erratum_stub(relobj
,
8185 erratum_insn_offset
) == NULL
)
8187 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8188 The_erratum_stub
* stub
;
8189 if (erratum_type
== ST_E_835769
)
8190 stub
= new The_erratum_stub(relobj
, erratum_type
, shndx
,
8191 erratum_insn_offset
);
8192 else if (erratum_type
== ST_E_843419
)
8193 stub
= new E843419_stub
<size
, big_endian
>(
8194 relobj
, shndx
, erratum_insn_offset
, e843419_adrp_offset
);
8197 stub
->set_erratum_insn(erratum_insn
);
8198 stub
->set_erratum_address(erratum_address
);
8199 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8200 // always the next insn after erratum insn.
8201 stub
->set_destination_address(erratum_address
+ BPI
);
8202 stub_table
->add_erratum_stub(stub
);
8207 // Scan erratum for section SHNDX range [output_address + span_start,
8208 // output_address + span_end). Note here we do not share the code with
8209 // scan_erratum_843419_span function, because for 843419 we optimize by only
8210 // scanning the last few insns of a page, whereas for 835769, we need to scan
8213 template<int size
, bool big_endian
>
8215 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
8216 AArch64_relobj
<size
, big_endian
>* relobj
,
8218 const section_size_type span_start
,
8219 const section_size_type span_end
,
8220 unsigned char* input_view
,
8221 Address output_address
)
8223 typedef typename
Insn_utilities::Insntype Insntype
;
8225 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8227 // Adjust output_address and view to the start of span.
8228 output_address
+= span_start
;
8229 input_view
+= span_start
;
8231 section_size_type span_length
= span_end
- span_start
;
8232 section_size_type offset
= 0;
8233 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
8235 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8236 Insntype insn1
= ip
[0];
8237 Insntype insn2
= ip
[1];
8238 if (is_erratum_835769_sequence(insn1
, insn2
))
8240 Insntype erratum_insn
= insn2
;
8241 // "span_start + offset" is the offset for insn1. So for insn2, it is
8242 // "span_start + offset + BPI".
8243 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
8244 Address erratum_address
= output_address
+ offset
+ BPI
;
8245 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8246 "section %d, offset 0x%08x."),
8247 relobj
->name().c_str(), shndx
,
8248 (unsigned int)(span_start
+ offset
));
8250 this->create_erratum_stub(relobj
, shndx
,
8251 erratum_insn_offset
, erratum_address
,
8252 erratum_insn
, ST_E_835769
);
8253 offset
+= BPI
; // Skip mac insn.
8256 } // End of "Target_aarch64::scan_erratum_835769_span".
8259 // Scan erratum for section SHNDX range
8260 // [output_address + span_start, output_address + span_end).
8262 template<int size
, bool big_endian
>
8264 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
8265 AArch64_relobj
<size
, big_endian
>* relobj
,
8267 const section_size_type span_start
,
8268 const section_size_type span_end
,
8269 unsigned char* input_view
,
8270 Address output_address
)
8272 typedef typename
Insn_utilities::Insntype Insntype
;
8274 // Adjust output_address and view to the start of span.
8275 output_address
+= span_start
;
8276 input_view
+= span_start
;
8278 if ((output_address
& 0x03) != 0)
8281 section_size_type offset
= 0;
8282 section_size_type span_length
= span_end
- span_start
;
8283 // The first instruction must be ending at 0xFF8 or 0xFFC.
8284 unsigned int page_offset
= output_address
& 0xFFF;
8285 // Make sure starting position, that is "output_address+offset",
8286 // starts at page position 0xff8 or 0xffc.
8287 if (page_offset
< 0xff8)
8288 offset
= 0xff8 - page_offset
;
8289 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8291 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8292 Insntype insn1
= ip
[0];
8293 if (Insn_utilities::is_adrp(insn1
))
8295 Insntype insn2
= ip
[1];
8296 Insntype insn3
= ip
[2];
8297 Insntype erratum_insn
;
8298 unsigned insn_offset
;
8299 bool do_report
= false;
8300 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
8303 erratum_insn
= insn3
;
8304 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
8306 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8308 // Optionally we can have an insn between ins2 and ins3
8309 Insntype insn_opt
= ip
[2];
8310 // And insn_opt must not be a branch.
8311 if (!Insn_utilities::aarch64_b(insn_opt
)
8312 && !Insn_utilities::aarch64_bl(insn_opt
)
8313 && !Insn_utilities::aarch64_blr(insn_opt
)
8314 && !Insn_utilities::aarch64_br(insn_opt
))
8316 // And insn_opt must not write to dest reg in insn1. However
8317 // we do a conservative scan, which means we may fix/report
8318 // more than necessary, but it doesn't hurt.
8320 Insntype insn4
= ip
[3];
8321 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8324 erratum_insn
= insn4
;
8325 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8331 unsigned int erratum_insn_offset
=
8332 span_start
+ offset
+ insn_offset
;
8333 Address erratum_address
=
8334 output_address
+ offset
+ insn_offset
;
8335 create_erratum_stub(relobj
, shndx
,
8336 erratum_insn_offset
, erratum_address
,
8337 erratum_insn
, ST_E_843419
,
8338 span_start
+ offset
);
8342 // Advance to next candidate instruction. We only consider instruction
8343 // sequences starting at a page offset of 0xff8 or 0xffc.
8344 page_offset
= (output_address
+ offset
) & 0xfff;
8345 if (page_offset
== 0xff8)
8347 else // (page_offset == 0xffc), we move to next page's 0xff8.
8350 } // End of "Target_aarch64::scan_erratum_843419_span".
8353 // The selector for aarch64 object files.
8355 template<int size
, bool big_endian
>
8356 class Target_selector_aarch64
: public Target_selector
8359 Target_selector_aarch64();
8362 do_instantiate_target()
8363 { return new Target_aarch64
<size
, big_endian
>(); }
8367 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8368 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8369 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8373 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8374 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8375 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8379 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8380 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8381 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8385 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8386 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8387 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8390 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8391 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8392 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8393 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8395 } // End anonymous namespace.