1 // aarch64.cc -- aarch64 target support for gold.
3 // Copyright (C) 2014-2015 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 multipled 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, becuase 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 if (parameters
->options().output_is_position_independent()
1331 && parameters
->options().output_is_executable())
1332 return ST_LONG_BRANCH_PCREL
;
1334 return ST_LONG_BRANCH_ABS
;
1337 // A class to hold stubs for the ARM target.
1339 template<int size
, bool big_endian
>
1340 class Stub_table
: public Output_data
1343 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1344 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1345 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
1346 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1347 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
1348 typedef typename
The_reloc_stub::Key The_reloc_stub_key
;
1349 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1350 typedef Erratum_stub_less
<size
, big_endian
> The_erratum_stub_less
;
1351 typedef typename
The_reloc_stub_key::hash The_reloc_stub_key_hash
;
1352 typedef typename
The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to
;
1353 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1354 typedef Unordered_map
<The_reloc_stub_key
, The_reloc_stub
*,
1355 The_reloc_stub_key_hash
, The_reloc_stub_key_equal_to
>
1357 typedef typename
Reloc_stub_map::const_iterator Reloc_stub_map_const_iter
;
1358 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
1360 typedef std::set
<The_erratum_stub
*, The_erratum_stub_less
> Erratum_stub_set
;
1361 typedef typename
Erratum_stub_set::iterator Erratum_stub_set_iter
;
1363 Stub_table(The_aarch64_input_section
* owner
)
1364 : Output_data(), owner_(owner
), reloc_stubs_size_(0),
1365 erratum_stubs_size_(0), prev_data_size_(0)
1371 The_aarch64_input_section
*
1375 // Whether this stub table is empty.
1378 { return reloc_stubs_
.empty() && erratum_stubs_
.empty(); }
1380 // Return the current data size.
1382 current_data_size() const
1383 { return this->current_data_size_for_child(); }
1385 // Add a STUB using KEY. The caller is responsible for avoiding addition
1386 // if a STUB with the same key has already been added.
1388 add_reloc_stub(The_reloc_stub
* stub
, const The_reloc_stub_key
& key
);
1390 // Add an erratum stub into the erratum stub set. The set is ordered by
1391 // (relobj, shndx, sh_offset).
1393 add_erratum_stub(The_erratum_stub
* stub
);
1395 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1397 find_erratum_stub(The_aarch64_relobj
* a64relobj
,
1398 unsigned int shndx
, unsigned int sh_offset
);
1400 // Find all the erratums for a given input section. The return value is a pair
1401 // of iterators [begin, end).
1402 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1403 find_erratum_stubs_for_input_section(The_aarch64_relobj
* a64relobj
,
1404 unsigned int shndx
);
1406 // Compute the erratum stub address.
1408 erratum_stub_address(The_erratum_stub
* stub
) const
1410 AArch64_address r
= align_address(this->address() + this->reloc_stubs_size_
,
1411 The_erratum_stub::STUB_ADDR_ALIGN
);
1412 r
+= stub
->offset();
1416 // Finalize stubs. No-op here, just for completeness.
1421 // Look up a relocation stub using KEY. Return NULL if there is none.
1423 find_reloc_stub(The_reloc_stub_key
& key
)
1425 Reloc_stub_map_const_iter p
= this->reloc_stubs_
.find(key
);
1426 return (p
!= this->reloc_stubs_
.end()) ? p
->second
: NULL
;
1429 // Relocate stubs in this stub table.
1431 relocate_stubs(const The_relocate_info
*,
1432 The_target_aarch64
*,
1438 // Update data size at the end of a relaxation pass. Return true if data size
1439 // is different from that of the previous relaxation pass.
1441 update_data_size_changed_p()
1443 // No addralign changed here.
1444 off_t s
= align_address(this->reloc_stubs_size_
,
1445 The_erratum_stub::STUB_ADDR_ALIGN
)
1446 + this->erratum_stubs_size_
;
1447 bool changed
= (s
!= this->prev_data_size_
);
1448 this->prev_data_size_
= s
;
1453 // Write out section contents.
1455 do_write(Output_file
*);
1457 // Return the required alignment.
1459 do_addralign() const
1461 return std::max(The_reloc_stub::STUB_ADDR_ALIGN
,
1462 The_erratum_stub::STUB_ADDR_ALIGN
);
1465 // Reset address and file offset.
1467 do_reset_address_and_file_offset()
1468 { this->set_current_data_size_for_child(this->prev_data_size_
); }
1470 // Set final data size.
1472 set_final_data_size()
1473 { this->set_data_size(this->current_data_size()); }
1476 // Relocate one stub.
1478 relocate_stub(The_reloc_stub
*,
1479 const The_relocate_info
*,
1480 The_target_aarch64
*,
1487 // Owner of this stub table.
1488 The_aarch64_input_section
* owner_
;
1489 // The relocation stubs.
1490 Reloc_stub_map reloc_stubs_
;
1491 // The erratum stubs.
1492 Erratum_stub_set erratum_stubs_
;
1493 // Size of reloc stubs.
1494 off_t reloc_stubs_size_
;
1495 // Size of erratum stubs.
1496 off_t erratum_stubs_size_
;
1497 // data size of this in the previous pass.
1498 off_t prev_data_size_
;
1499 }; // End of Stub_table
1502 // Add an erratum stub into the erratum stub set. The set is ordered by
1503 // (relobj, shndx, sh_offset).
1505 template<int size
, bool big_endian
>
1507 Stub_table
<size
, big_endian
>::add_erratum_stub(The_erratum_stub
* stub
)
1509 std::pair
<Erratum_stub_set_iter
, bool> ret
=
1510 this->erratum_stubs_
.insert(stub
);
1511 gold_assert(ret
.second
);
1512 this->erratum_stubs_size_
= align_address(
1513 this->erratum_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1514 stub
->set_offset(this->erratum_stubs_size_
);
1515 this->erratum_stubs_size_
+= stub
->stub_size();
1519 // Find if such erratum exists for given (obj, shndx, sh_offset).
1521 template<int size
, bool big_endian
>
1522 Erratum_stub
<size
, big_endian
>*
1523 Stub_table
<size
, big_endian
>::find_erratum_stub(
1524 The_aarch64_relobj
* a64relobj
, unsigned int shndx
, unsigned int sh_offset
)
1526 // A dummy object used as key to search in the set.
1527 The_erratum_stub
key(a64relobj
, ST_NONE
,
1529 Erratum_stub_set_iter i
= this->erratum_stubs_
.find(&key
);
1530 if (i
!= this->erratum_stubs_
.end())
1532 The_erratum_stub
* stub(*i
);
1533 gold_assert(stub
->erratum_insn() != 0);
1540 // Find all the errata for a given input section. The return value is a pair of
1541 // iterators [begin, end).
1543 template<int size
, bool big_endian
>
1544 std::pair
<typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
,
1545 typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
>
1546 Stub_table
<size
, big_endian
>::find_erratum_stubs_for_input_section(
1547 The_aarch64_relobj
* a64relobj
, unsigned int shndx
)
1549 typedef std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
> Result_pair
;
1550 Erratum_stub_set_iter start
, end
;
1551 The_erratum_stub
low_key(a64relobj
, ST_NONE
, shndx
, 0);
1552 start
= this->erratum_stubs_
.lower_bound(&low_key
);
1553 if (start
== this->erratum_stubs_
.end())
1554 return Result_pair(this->erratum_stubs_
.end(),
1555 this->erratum_stubs_
.end());
1557 while (end
!= this->erratum_stubs_
.end() &&
1558 (*end
)->relobj() == a64relobj
&& (*end
)->shndx() == shndx
)
1560 return Result_pair(start
, end
);
1564 // Add a STUB using KEY. The caller is responsible for avoiding addition
1565 // if a STUB with the same key has already been added.
1567 template<int size
, bool big_endian
>
1569 Stub_table
<size
, big_endian
>::add_reloc_stub(
1570 The_reloc_stub
* stub
, const The_reloc_stub_key
& key
)
1572 gold_assert(stub
->type() == key
.type());
1573 this->reloc_stubs_
[key
] = stub
;
1575 // Assign stub offset early. We can do this because we never remove
1576 // reloc stubs and they are in the beginning of the stub table.
1577 this->reloc_stubs_size_
= align_address(this->reloc_stubs_size_
,
1578 The_reloc_stub::STUB_ADDR_ALIGN
);
1579 stub
->set_offset(this->reloc_stubs_size_
);
1580 this->reloc_stubs_size_
+= stub
->stub_size();
1584 // Relocate all stubs in this stub table.
1586 template<int size
, bool big_endian
>
1588 Stub_table
<size
, big_endian
>::
1589 relocate_stubs(const The_relocate_info
* relinfo
,
1590 The_target_aarch64
* target_aarch64
,
1591 Output_section
* output_section
,
1592 unsigned char* view
,
1593 AArch64_address address
,
1594 section_size_type view_size
)
1596 // "view_size" is the total size of the stub_table.
1597 gold_assert(address
== this->address() &&
1598 view_size
== static_cast<section_size_type
>(this->data_size()));
1599 for(Reloc_stub_map_const_iter p
= this->reloc_stubs_
.begin();
1600 p
!= this->reloc_stubs_
.end(); ++p
)
1601 relocate_stub(p
->second
, relinfo
, target_aarch64
, output_section
,
1602 view
, address
, view_size
);
1604 // Just for convenience.
1605 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1607 // Now 'relocate' erratum stubs.
1608 for(Erratum_stub_set_iter i
= this->erratum_stubs_
.begin();
1609 i
!= this->erratum_stubs_
.end(); ++i
)
1611 AArch64_address stub_address
= this->erratum_stub_address(*i
);
1612 // The address of "b" in the stub that is to be "relocated".
1613 AArch64_address stub_b_insn_address
;
1614 // Branch offset that is to be filled in "b" insn.
1616 switch ((*i
)->type())
1620 // The 1st insn of the erratum could be a relocation spot,
1621 // in this case we need to fix it with
1622 // "(*i)->erratum_insn()".
1623 elfcpp::Swap
<32, big_endian
>::writeval(
1624 view
+ (stub_address
- this->address()),
1625 (*i
)->erratum_insn());
1626 // For the erratum, the 2nd insn is a b-insn to be patched
1628 stub_b_insn_address
= stub_address
+ 1 * BPI
;
1629 b_offset
= (*i
)->destination_address() - stub_b_insn_address
;
1630 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1631 view
+ (stub_b_insn_address
- this->address()),
1632 ((unsigned int)(b_offset
)) & 0xfffffff);
1642 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
1644 template<int size
, bool big_endian
>
1646 Stub_table
<size
, big_endian
>::
1647 relocate_stub(The_reloc_stub
* stub
,
1648 const The_relocate_info
* relinfo
,
1649 The_target_aarch64
* target_aarch64
,
1650 Output_section
* output_section
,
1651 unsigned char* view
,
1652 AArch64_address address
,
1653 section_size_type view_size
)
1655 // "offset" is the offset from the beginning of the stub_table.
1656 section_size_type offset
= stub
->offset();
1657 section_size_type stub_size
= stub
->stub_size();
1658 // "view_size" is the total size of the stub_table.
1659 gold_assert(offset
+ stub_size
<= view_size
);
1661 target_aarch64
->relocate_stub(stub
, relinfo
, output_section
,
1662 view
+ offset
, address
+ offset
, view_size
);
1666 // Write out the stubs to file.
1668 template<int size
, bool big_endian
>
1670 Stub_table
<size
, big_endian
>::do_write(Output_file
* of
)
1672 off_t offset
= this->offset();
1673 const section_size_type oview_size
=
1674 convert_to_section_size_type(this->data_size());
1675 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1677 // Write relocation stubs.
1678 for (typename
Reloc_stub_map::const_iterator p
= this->reloc_stubs_
.begin();
1679 p
!= this->reloc_stubs_
.end(); ++p
)
1681 The_reloc_stub
* stub
= p
->second
;
1682 AArch64_address address
= this->address() + stub
->offset();
1683 gold_assert(address
==
1684 align_address(address
, The_reloc_stub::STUB_ADDR_ALIGN
));
1685 stub
->write(oview
+ stub
->offset(), stub
->stub_size());
1688 // Write erratum stubs.
1689 unsigned int erratum_stub_start_offset
=
1690 align_address(this->reloc_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1691 for (typename
Erratum_stub_set::iterator p
= this->erratum_stubs_
.begin();
1692 p
!= this->erratum_stubs_
.end(); ++p
)
1694 The_erratum_stub
* stub(*p
);
1695 stub
->write(oview
+ erratum_stub_start_offset
+ stub
->offset(),
1699 of
->write_output_view(this->offset(), oview_size
, oview
);
1703 // AArch64_relobj class.
1705 template<int size
, bool big_endian
>
1706 class AArch64_relobj
: public Sized_relobj_file
<size
, big_endian
>
1709 typedef AArch64_relobj
<size
, big_endian
> This
;
1710 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1711 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1712 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1713 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1714 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1715 typedef typename
The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter
;
1716 typedef std::vector
<The_stub_table
*> Stub_table_list
;
1717 static const AArch64_address invalid_address
=
1718 static_cast<AArch64_address
>(-1);
1720 AArch64_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1721 const typename
elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1722 : Sized_relobj_file
<size
, big_endian
>(name
, input_file
, offset
, ehdr
),
1729 // Return the stub table of the SHNDX-th section if there is one.
1731 stub_table(unsigned int shndx
) const
1733 gold_assert(shndx
< this->stub_tables_
.size());
1734 return this->stub_tables_
[shndx
];
1737 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1739 set_stub_table(unsigned int shndx
, The_stub_table
* stub_table
)
1741 gold_assert(shndx
< this->stub_tables_
.size());
1742 this->stub_tables_
[shndx
] = stub_table
;
1745 // Entrance to errata scanning.
1747 scan_errata(unsigned int shndx
,
1748 const elfcpp::Shdr
<size
, big_endian
>&,
1749 Output_section
*, const Symbol_table
*,
1750 The_target_aarch64
*);
1752 // Scan all relocation sections for stub generation.
1754 scan_sections_for_stubs(The_target_aarch64
*, const Symbol_table
*,
1757 // Whether a section is a scannable text section.
1759 text_section_is_scannable(const elfcpp::Shdr
<size
, big_endian
>&, unsigned int,
1760 const Output_section
*, const Symbol_table
*);
1762 // Convert regular input section with index SHNDX to a relaxed section.
1764 convert_input_section_to_relaxed_section(unsigned /* shndx */)
1766 // The stubs have relocations and we need to process them after writing
1767 // out the stubs. So relocation now must follow section write.
1768 this->set_relocs_must_follow_section_writes();
1771 // Structure for mapping symbol position.
1772 struct Mapping_symbol_position
1774 Mapping_symbol_position(unsigned int shndx
, AArch64_address offset
):
1775 shndx_(shndx
), offset_(offset
)
1778 // "<" comparator used in ordered_map container.
1780 operator<(const Mapping_symbol_position
& p
) const
1782 return (this->shndx_
< p
.shndx_
1783 || (this->shndx_
== p
.shndx_
&& this->offset_
< p
.offset_
));
1787 unsigned int shndx_
;
1790 AArch64_address offset_
;
1793 typedef std::map
<Mapping_symbol_position
, char> Mapping_symbol_info
;
1796 // Post constructor setup.
1800 // Call parent's setup method.
1801 Sized_relobj_file
<size
, big_endian
>::do_setup();
1803 // Initialize look-up tables.
1804 this->stub_tables_
.resize(this->shnum());
1808 do_relocate_sections(
1809 const Symbol_table
* symtab
, const Layout
* layout
,
1810 const unsigned char* pshdrs
, Output_file
* of
,
1811 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1813 // Count local symbols and (optionally) record mapping info.
1815 do_count_local_symbols(Stringpool_template
<char>*,
1816 Stringpool_template
<char>*);
1819 // Fix all errata in the object.
1821 fix_errata(typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1823 // Try to fix erratum 843419 in an optimized way. Return true if patch is
1826 try_fix_erratum_843419_optimized(
1828 typename Sized_relobj_file
<size
, big_endian
>::View_size
&);
1830 // Whether a section needs to be scanned for relocation stubs.
1832 section_needs_reloc_stub_scanning(const elfcpp::Shdr
<size
, big_endian
>&,
1833 const Relobj::Output_sections
&,
1834 const Symbol_table
*, const unsigned char*);
1836 // List of stub tables.
1837 Stub_table_list stub_tables_
;
1839 // Mapping symbol information sorted by (section index, section_offset).
1840 Mapping_symbol_info mapping_symbol_info_
;
1841 }; // End of AArch64_relobj
1844 // Override to record mapping symbol information.
1845 template<int size
, bool big_endian
>
1847 AArch64_relobj
<size
, big_endian
>::do_count_local_symbols(
1848 Stringpool_template
<char>* pool
, Stringpool_template
<char>* dynpool
)
1850 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(pool
, dynpool
);
1852 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1853 // processing if not fixing erratum.
1854 if (!parameters
->options().fix_cortex_a53_843419()
1855 && !parameters
->options().fix_cortex_a53_835769())
1858 const unsigned int loccount
= this->local_symbol_count();
1862 // Read the symbol table section header.
1863 const unsigned int symtab_shndx
= this->symtab_shndx();
1864 elfcpp::Shdr
<size
, big_endian
>
1865 symtabshdr(this, this->elf_file()->section_header(symtab_shndx
));
1866 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1868 // Read the local symbols.
1869 const int sym_size
=elfcpp::Elf_sizes
<size
>::sym_size
;
1870 gold_assert(loccount
== symtabshdr
.get_sh_info());
1871 off_t locsize
= loccount
* sym_size
;
1872 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1873 locsize
, true, true);
1875 // For mapping symbol processing, we need to read the symbol names.
1876 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
1877 if (strtab_shndx
>= this->shnum())
1879 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
1883 elfcpp::Shdr
<size
, big_endian
>
1884 strtabshdr(this, this->elf_file()->section_header(strtab_shndx
));
1885 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
1887 this->error(_("symbol table name section has wrong type: %u"),
1888 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
1892 const char* pnames
=
1893 reinterpret_cast<const char*>(this->get_view(strtabshdr
.get_sh_offset(),
1894 strtabshdr
.get_sh_size(),
1897 // Skip the first dummy symbol.
1899 typename Sized_relobj_file
<size
, big_endian
>::Local_values
*
1900 plocal_values
= this->local_values();
1901 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1903 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1904 Symbol_value
<size
>& lv((*plocal_values
)[i
]);
1905 AArch64_address input_value
= lv
.input_value();
1907 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1908 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1910 // Mapping symbols could be one of the following 4 forms -
1915 const char* sym_name
= pnames
+ sym
.get_st_name();
1916 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1917 && (sym_name
[2] == '\0' || sym_name
[2] == '.'))
1920 unsigned int input_shndx
=
1921 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1922 gold_assert(is_ordinary
);
1924 Mapping_symbol_position
msp(input_shndx
, input_value
);
1925 // Insert mapping_symbol_info into map whose ordering is defined by
1926 // (shndx, offset_within_section).
1927 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1933 // Fix all errata in the object.
1935 template<int size
, bool big_endian
>
1937 AArch64_relobj
<size
, big_endian
>::fix_errata(
1938 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1940 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1941 unsigned int shnum
= this->shnum();
1942 for (unsigned int i
= 1; i
< shnum
; ++i
)
1944 The_stub_table
* stub_table
= this->stub_table(i
);
1947 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1948 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
1949 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
1952 The_erratum_stub
* stub
= *p
;
1953 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1954 pview((*pviews
)[i
]);
1956 // Double check data before fix.
1957 gold_assert(pview
.address
+ stub
->sh_offset()
1958 == stub
->erratum_address());
1960 // Update previously recorded erratum insn with relocated
1963 reinterpret_cast<Insntype
*>(pview
.view
+ stub
->sh_offset());
1964 Insntype insn_to_fix
= ip
[0];
1965 stub
->update_erratum_insn(insn_to_fix
);
1967 // First try to see if erratum is 843419 and if it can be fixed
1968 // without using branch-to-stub.
1969 if (!try_fix_erratum_843419_optimized(stub
, pview
))
1971 // Replace the erratum insn with a branch-to-stub.
1972 AArch64_address stub_address
=
1973 stub_table
->erratum_stub_address(stub
);
1974 unsigned int b_offset
= stub_address
- stub
->erratum_address();
1975 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1976 pview
.view
+ stub
->sh_offset(), b_offset
& 0xfffffff);
1984 // This is an optimization for 843419. This erratum requires the sequence begin
1985 // with 'adrp', when final value calculated by adrp fits in adr, we can just
1986 // replace 'adrp' with 'adr', so we save 2 jumps per occurrence. (Note, however,
1987 // in this case, we do not delete the erratum stub (too late to do so), it is
1988 // merely generated without ever being called.)
1990 template<int size
, bool big_endian
>
1992 AArch64_relobj
<size
, big_endian
>::try_fix_erratum_843419_optimized(
1993 The_erratum_stub
* stub
,
1994 typename Sized_relobj_file
<size
, big_endian
>::View_size
& pview
)
1996 if (stub
->type() != ST_E_843419
)
1999 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2000 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
2001 E843419_stub
<size
, big_endian
>* e843419_stub
=
2002 reinterpret_cast<E843419_stub
<size
, big_endian
>*>(stub
);
2003 AArch64_address pc
= pview
.address
+ e843419_stub
->adrp_sh_offset();
2004 Insntype
* adrp_view
= reinterpret_cast<Insntype
*>(
2005 pview
.view
+ e843419_stub
->adrp_sh_offset());
2006 Insntype adrp_insn
= adrp_view
[0];
2007 gold_assert(Insn_utilities::is_adrp(adrp_insn
));
2008 // Get adrp 33-bit signed imm value.
2009 int64_t adrp_imm
= Insn_utilities::
2010 aarch64_adrp_decode_imm(adrp_insn
);
2011 // adrp - final value transferred to target register is calculated as:
2012 // PC[11:0] = Zeros(12)
2013 // adrp_dest_value = PC + adrp_imm;
2014 int64_t adrp_dest_value
= (pc
& ~((1 << 12) - 1)) + adrp_imm
;
2015 // adr -final value transferred to target register is calucalted as:
2018 // PC + adr_imm = adrp_dest_value
2020 // adr_imm = adrp_dest_value - PC
2021 int64_t adr_imm
= adrp_dest_value
- pc
;
2022 // Check if imm fits in adr (21-bit signed).
2023 if (-(1 << 20) <= adr_imm
&& adr_imm
< (1 << 20))
2025 // Convert 'adrp' into 'adr'.
2026 Insntype adr_insn
= adrp_insn
& ((1u << 31) - 1);
2027 adr_insn
= Insn_utilities::
2028 aarch64_adr_encode_imm(adr_insn
, adr_imm
);
2029 elfcpp::Swap
<32, big_endian
>::writeval(adrp_view
, adr_insn
);
2036 // Relocate sections.
2038 template<int size
, bool big_endian
>
2040 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
2041 const Symbol_table
* symtab
, const Layout
* layout
,
2042 const unsigned char* pshdrs
, Output_file
* of
,
2043 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
2045 // Call parent to relocate sections.
2046 Sized_relobj_file
<size
, big_endian
>::do_relocate_sections(symtab
, layout
,
2047 pshdrs
, of
, pviews
);
2049 // We do not generate stubs if doing a relocatable link.
2050 if (parameters
->options().relocatable())
2053 if (parameters
->options().fix_cortex_a53_843419()
2054 || parameters
->options().fix_cortex_a53_835769())
2055 this->fix_errata(pviews
);
2057 Relocate_info
<size
, big_endian
> relinfo
;
2058 relinfo
.symtab
= symtab
;
2059 relinfo
.layout
= layout
;
2060 relinfo
.object
= this;
2062 // Relocate stub tables.
2063 unsigned int shnum
= this->shnum();
2064 The_target_aarch64
* target
= The_target_aarch64::current_target();
2066 for (unsigned int i
= 1; i
< shnum
; ++i
)
2068 The_aarch64_input_section
* aarch64_input_section
=
2069 target
->find_aarch64_input_section(this, i
);
2070 if (aarch64_input_section
!= NULL
2071 && aarch64_input_section
->is_stub_table_owner()
2072 && !aarch64_input_section
->stub_table()->empty())
2074 Output_section
* os
= this->output_section(i
);
2075 gold_assert(os
!= NULL
);
2077 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
2078 relinfo
.reloc_shdr
= NULL
;
2079 relinfo
.data_shndx
= i
;
2080 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
2082 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
2083 view_struct
= (*pviews
)[i
];
2084 gold_assert(view_struct
.view
!= NULL
);
2086 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
2087 off_t offset
= stub_table
->address() - view_struct
.address
;
2088 unsigned char* view
= view_struct
.view
+ offset
;
2089 AArch64_address address
= stub_table
->address();
2090 section_size_type view_size
= stub_table
->data_size();
2091 stub_table
->relocate_stubs(&relinfo
, target
, os
, view
, address
,
2098 // Determine if an input section is scannable for stub processing. SHDR is
2099 // the header of the section and SHNDX is the section index. OS is the output
2100 // section for the input section and SYMTAB is the global symbol table used to
2101 // look up ICF information.
2103 template<int size
, bool big_endian
>
2105 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
2106 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
2107 unsigned int text_shndx
,
2108 const Output_section
* os
,
2109 const Symbol_table
* symtab
)
2111 // Skip any empty sections, unallocated sections or sections whose
2112 // type are not SHT_PROGBITS.
2113 if (text_shdr
.get_sh_size() == 0
2114 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
2115 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2118 // Skip any discarded or ICF'ed sections.
2119 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
2122 // Skip exception frame.
2123 if (strcmp(os
->name(), ".eh_frame") == 0)
2126 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
2127 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2133 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2134 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2136 template<int size
, bool big_endian
>
2138 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2139 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2140 const Relobj::Output_sections
& out_sections
,
2141 const Symbol_table
* symtab
,
2142 const unsigned char* pshdrs
)
2144 unsigned int sh_type
= shdr
.get_sh_type();
2145 if (sh_type
!= elfcpp::SHT_RELA
)
2148 // Ignore empty section.
2149 off_t sh_size
= shdr
.get_sh_size();
2153 // Ignore reloc section with unexpected symbol table. The
2154 // error will be reported in the final link.
2155 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2158 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2159 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2161 // Ignore reloc section with unexpected entsize or uneven size.
2162 // The error will be reported in the final link.
2163 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2166 // Ignore reloc section with bad info. This error will be
2167 // reported in the final link.
2168 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2169 if (text_shndx
>= this->shnum())
2172 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2173 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2174 text_shndx
* shdr_size
);
2175 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2176 out_sections
[text_shndx
], symtab
);
2180 // Scan section SHNDX for erratum 843419 and 835769.
2182 template<int size
, bool big_endian
>
2184 AArch64_relobj
<size
, big_endian
>::scan_errata(
2185 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2186 Output_section
* os
, const Symbol_table
* symtab
,
2187 The_target_aarch64
* target
)
2189 if (shdr
.get_sh_size() == 0
2190 || (shdr
.get_sh_flags() &
2191 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2192 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2195 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2197 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2198 AArch64_address output_address
;
2199 if (output_offset
!= invalid_address
)
2200 output_address
= os
->address() + output_offset
;
2203 const Output_relaxed_input_section
* poris
=
2204 os
->find_relaxed_input_section(this, shndx
);
2206 output_address
= poris
->address();
2209 section_size_type input_view_size
= 0;
2210 const unsigned char* input_view
=
2211 this->section_contents(shndx
, &input_view_size
, false);
2213 Mapping_symbol_position
section_start(shndx
, 0);
2214 // Find the first mapping symbol record within section shndx.
2215 typename
Mapping_symbol_info::const_iterator p
=
2216 this->mapping_symbol_info_
.lower_bound(section_start
);
2217 while (p
!= this->mapping_symbol_info_
.end() &&
2218 p
->first
.shndx_
== shndx
)
2220 typename
Mapping_symbol_info::const_iterator prev
= p
;
2222 if (prev
->second
== 'x')
2224 section_size_type span_start
=
2225 convert_to_section_size_type(prev
->first
.offset_
);
2226 section_size_type span_end
;
2227 if (p
!= this->mapping_symbol_info_
.end()
2228 && p
->first
.shndx_
== shndx
)
2229 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2231 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2233 // Here we do not share the scanning code of both errata. For 843419,
2234 // only the last few insns of each page are examined, which is fast,
2235 // whereas, for 835769, every insn pair needs to be checked.
2237 if (parameters
->options().fix_cortex_a53_843419())
2238 target
->scan_erratum_843419_span(
2239 this, shndx
, span_start
, span_end
,
2240 const_cast<unsigned char*>(input_view
), output_address
);
2242 if (parameters
->options().fix_cortex_a53_835769())
2243 target
->scan_erratum_835769_span(
2244 this, shndx
, span_start
, span_end
,
2245 const_cast<unsigned char*>(input_view
), output_address
);
2251 // Scan relocations for stub generation.
2253 template<int size
, bool big_endian
>
2255 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2256 The_target_aarch64
* target
,
2257 const Symbol_table
* symtab
,
2258 const Layout
* layout
)
2260 unsigned int shnum
= this->shnum();
2261 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2263 // Read the section headers.
2264 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2268 // To speed up processing, we set up hash tables for fast lookup of
2269 // input offsets to output addresses.
2270 this->initialize_input_to_output_maps();
2272 const Relobj::Output_sections
& out_sections(this->output_sections());
2274 Relocate_info
<size
, big_endian
> relinfo
;
2275 relinfo
.symtab
= symtab
;
2276 relinfo
.layout
= layout
;
2277 relinfo
.object
= this;
2279 // Do relocation stubs scanning.
2280 const unsigned char* p
= pshdrs
+ shdr_size
;
2281 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2283 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2284 if (parameters
->options().fix_cortex_a53_843419()
2285 || parameters
->options().fix_cortex_a53_835769())
2286 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2287 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2290 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2291 AArch64_address output_offset
=
2292 this->get_output_section_offset(index
);
2293 AArch64_address output_address
;
2294 if (output_offset
!= invalid_address
)
2296 output_address
= out_sections
[index
]->address() + output_offset
;
2300 // Currently this only happens for a relaxed section.
2301 const Output_relaxed_input_section
* poris
=
2302 out_sections
[index
]->find_relaxed_input_section(this, index
);
2303 gold_assert(poris
!= NULL
);
2304 output_address
= poris
->address();
2307 // Get the relocations.
2308 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2312 // Get the section contents.
2313 section_size_type input_view_size
= 0;
2314 const unsigned char* input_view
=
2315 this->section_contents(index
, &input_view_size
, false);
2317 relinfo
.reloc_shndx
= i
;
2318 relinfo
.data_shndx
= index
;
2319 unsigned int sh_type
= shdr
.get_sh_type();
2320 unsigned int reloc_size
;
2321 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2322 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2324 Output_section
* os
= out_sections
[index
];
2325 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2326 shdr
.get_sh_size() / reloc_size
,
2328 output_offset
== invalid_address
,
2329 input_view
, output_address
,
2336 // A class to wrap an ordinary input section containing executable code.
2338 template<int size
, bool big_endian
>
2339 class AArch64_input_section
: public Output_relaxed_input_section
2342 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2344 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2345 : Output_relaxed_input_section(relobj
, shndx
, 1),
2347 original_contents_(NULL
), original_size_(0),
2348 original_addralign_(1)
2351 ~AArch64_input_section()
2352 { delete[] this->original_contents_
; }
2358 // Set the stub_table.
2360 set_stub_table(The_stub_table
* st
)
2361 { this->stub_table_
= st
; }
2363 // Whether this is a stub table owner.
2365 is_stub_table_owner() const
2366 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2368 // Return the original size of the section.
2370 original_size() const
2371 { return this->original_size_
; }
2373 // Return the stub table.
2376 { return stub_table_
; }
2379 // Write out this input section.
2381 do_write(Output_file
*);
2383 // Return required alignment of this.
2385 do_addralign() const
2387 if (this->is_stub_table_owner())
2388 return std::max(this->stub_table_
->addralign(),
2389 static_cast<uint64_t>(this->original_addralign_
));
2391 return this->original_addralign_
;
2394 // Finalize data size.
2396 set_final_data_size();
2398 // Reset address and file offset.
2400 do_reset_address_and_file_offset();
2404 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2405 section_offset_type offset
,
2406 section_offset_type
* poutput
) const
2408 if ((object
== this->relobj())
2409 && (shndx
== this->shndx())
2412 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2422 // Copying is not allowed.
2423 AArch64_input_section(const AArch64_input_section
&);
2424 AArch64_input_section
& operator=(const AArch64_input_section
&);
2426 // The relocation stubs.
2427 The_stub_table
* stub_table_
;
2428 // Original section contents. We have to make a copy here since the file
2429 // containing the original section may not be locked when we need to access
2431 unsigned char* original_contents_
;
2432 // Section size of the original input section.
2433 uint32_t original_size_
;
2434 // Address alignment of the original input section.
2435 uint32_t original_addralign_
;
2436 }; // End of AArch64_input_section
2439 // Finalize data size.
2441 template<int size
, bool big_endian
>
2443 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2445 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2447 if (this->is_stub_table_owner())
2449 this->stub_table_
->finalize_data_size();
2450 off
= align_address(off
, this->stub_table_
->addralign());
2451 off
+= this->stub_table_
->data_size();
2453 this->set_data_size(off
);
2457 // Reset address and file offset.
2459 template<int size
, bool big_endian
>
2461 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2463 // Size of the original input section contents.
2464 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2466 // If this is a stub table owner, account for the stub table size.
2467 if (this->is_stub_table_owner())
2469 The_stub_table
* stub_table
= this->stub_table_
;
2471 // Reset the stub table's address and file offset. The
2472 // current data size for child will be updated after that.
2473 stub_table_
->reset_address_and_file_offset();
2474 off
= align_address(off
, stub_table_
->addralign());
2475 off
+= stub_table
->current_data_size();
2478 this->set_current_data_size(off
);
2482 // Initialize an Arm_input_section.
2484 template<int size
, bool big_endian
>
2486 AArch64_input_section
<size
, big_endian
>::init()
2488 Relobj
* relobj
= this->relobj();
2489 unsigned int shndx
= this->shndx();
2491 // We have to cache original size, alignment and contents to avoid locking
2492 // the original file.
2493 this->original_addralign_
=
2494 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2496 // This is not efficient but we expect only a small number of relaxed
2497 // input sections for stubs.
2498 section_size_type section_size
;
2499 const unsigned char* section_contents
=
2500 relobj
->section_contents(shndx
, §ion_size
, false);
2501 this->original_size_
=
2502 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2504 gold_assert(this->original_contents_
== NULL
);
2505 this->original_contents_
= new unsigned char[section_size
];
2506 memcpy(this->original_contents_
, section_contents
, section_size
);
2508 // We want to make this look like the original input section after
2509 // output sections are finalized.
2510 Output_section
* os
= relobj
->output_section(shndx
);
2511 off_t offset
= relobj
->output_section_offset(shndx
);
2512 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2513 this->set_address(os
->address() + offset
);
2514 this->set_file_offset(os
->offset() + offset
);
2515 this->set_current_data_size(this->original_size_
);
2516 this->finalize_data_size();
2520 // Write data to output file.
2522 template<int size
, bool big_endian
>
2524 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2526 // We have to write out the original section content.
2527 gold_assert(this->original_contents_
!= NULL
);
2528 of
->write(this->offset(), this->original_contents_
,
2529 this->original_size_
);
2531 // If this owns a stub table and it is not empty, write it.
2532 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2533 this->stub_table_
->write(of
);
2537 // Arm output section class. This is defined mainly to add a number of stub
2538 // generation methods.
2540 template<int size
, bool big_endian
>
2541 class AArch64_output_section
: public Output_section
2544 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2545 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2546 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2547 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2550 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2551 elfcpp::Elf_Xword flags
)
2552 : Output_section(name
, type
, flags
)
2555 ~AArch64_output_section() {}
2557 // Group input sections for stub generation.
2559 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2563 typedef Output_section::Input_section Input_section
;
2564 typedef Output_section::Input_section_list Input_section_list
;
2566 // Create a stub group.
2568 create_stub_group(Input_section_list::const_iterator
,
2569 Input_section_list::const_iterator
,
2570 Input_section_list::const_iterator
,
2571 The_target_aarch64
*,
2572 std::vector
<Output_relaxed_input_section
*>&,
2574 }; // End of AArch64_output_section
2577 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2578 // the input section that will be the owner of the stub table.
2580 template<int size
, bool big_endian
> void
2581 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2582 Input_section_list::const_iterator first
,
2583 Input_section_list::const_iterator last
,
2584 Input_section_list::const_iterator owner
,
2585 The_target_aarch64
* target
,
2586 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2589 // Currently we convert ordinary input sections into relaxed sections only
2591 The_aarch64_input_section
* input_section
;
2592 if (owner
->is_relaxed_input_section())
2596 gold_assert(owner
->is_input_section());
2597 // Create a new relaxed input section. We need to lock the original
2599 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2601 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2602 new_relaxed_sections
.push_back(input_section
);
2605 // Create a stub table.
2606 The_stub_table
* stub_table
=
2607 target
->new_stub_table(input_section
);
2609 input_section
->set_stub_table(stub_table
);
2611 Input_section_list::const_iterator p
= first
;
2612 // Look for input sections or relaxed input sections in [first ... last].
2615 if (p
->is_input_section() || p
->is_relaxed_input_section())
2617 // The stub table information for input sections live
2618 // in their objects.
2619 The_aarch64_relobj
* aarch64_relobj
=
2620 static_cast<The_aarch64_relobj
*>(p
->relobj());
2621 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2624 while (p
++ != last
);
2628 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2629 // stub groups. We grow a stub group by adding input section until the size is
2630 // just below GROUP_SIZE. The last input section will be converted into a stub
2631 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2632 // after the stub table, effectively doubling the group size.
2634 // This is similar to the group_sections() function in elf32-arm.c but is
2635 // implemented differently.
2637 template<int size
, bool big_endian
>
2638 void AArch64_output_section
<size
, big_endian
>::group_sections(
2639 section_size_type group_size
,
2640 bool stubs_always_after_branch
,
2641 Target_aarch64
<size
, big_endian
>* target
,
2647 FINDING_STUB_SECTION
,
2651 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2653 State state
= NO_GROUP
;
2654 section_size_type off
= 0;
2655 section_size_type group_begin_offset
= 0;
2656 section_size_type group_end_offset
= 0;
2657 section_size_type stub_table_end_offset
= 0;
2658 Input_section_list::const_iterator group_begin
=
2659 this->input_sections().end();
2660 Input_section_list::const_iterator stub_table
=
2661 this->input_sections().end();
2662 Input_section_list::const_iterator group_end
= this->input_sections().end();
2663 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2664 p
!= this->input_sections().end();
2667 section_size_type section_begin_offset
=
2668 align_address(off
, p
->addralign());
2669 section_size_type section_end_offset
=
2670 section_begin_offset
+ p
->data_size();
2672 // Check to see if we should group the previously seen sections.
2678 case FINDING_STUB_SECTION
:
2679 // Adding this section makes the group larger than GROUP_SIZE.
2680 if (section_end_offset
- group_begin_offset
>= group_size
)
2682 if (stubs_always_after_branch
)
2684 gold_assert(group_end
!= this->input_sections().end());
2685 this->create_stub_group(group_begin
, group_end
, group_end
,
2686 target
, new_relaxed_sections
,
2692 // Input sections up to stub_group_size bytes after the stub
2693 // table can be handled by it too.
2694 state
= HAS_STUB_SECTION
;
2695 stub_table
= group_end
;
2696 stub_table_end_offset
= group_end_offset
;
2701 case HAS_STUB_SECTION
:
2702 // Adding this section makes the post stub-section group larger
2705 // NOT SUPPORTED YET. For completeness only.
2706 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2708 gold_assert(group_end
!= this->input_sections().end());
2709 this->create_stub_group(group_begin
, group_end
, stub_table
,
2710 target
, new_relaxed_sections
, task
);
2719 // If we see an input section and currently there is no group, start
2720 // a new one. Skip any empty sections. We look at the data size
2721 // instead of calling p->relobj()->section_size() to avoid locking.
2722 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2723 && (p
->data_size() != 0))
2725 if (state
== NO_GROUP
)
2727 state
= FINDING_STUB_SECTION
;
2729 group_begin_offset
= section_begin_offset
;
2732 // Keep track of the last input section seen.
2734 group_end_offset
= section_end_offset
;
2737 off
= section_end_offset
;
2740 // Create a stub group for any ungrouped sections.
2741 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2743 gold_assert(group_end
!= this->input_sections().end());
2744 this->create_stub_group(group_begin
, group_end
,
2745 (state
== FINDING_STUB_SECTION
2748 target
, new_relaxed_sections
, task
);
2751 if (!new_relaxed_sections
.empty())
2752 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2754 // Update the section offsets
2755 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2757 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2758 new_relaxed_sections
[i
]->relobj());
2759 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2760 // Tell AArch64_relobj that this input section is converted.
2761 relobj
->convert_input_section_to_relaxed_section(shndx
);
2763 } // End of AArch64_output_section::group_sections
2766 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2769 // The aarch64 target class.
2771 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2772 template<int size
, bool big_endian
>
2773 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2776 typedef Target_aarch64
<size
, big_endian
> This
;
2777 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2779 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2780 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2781 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2782 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2783 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2784 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2785 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2786 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2787 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2788 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2789 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2790 typedef Unordered_map
<Section_id
,
2791 AArch64_input_section
<size
, big_endian
>*,
2792 Section_id_hash
> AArch64_input_section_map
;
2793 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2794 const static int TCB_SIZE
= size
/ 8 * 2;
2796 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2797 : Sized_target
<size
, big_endian
>(info
),
2798 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2799 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2800 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2801 got_mod_index_offset_(-1U),
2802 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2803 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2806 // Scan the relocations to determine unreferenced sections for
2807 // garbage collection.
2809 gc_process_relocs(Symbol_table
* symtab
,
2811 Sized_relobj_file
<size
, big_endian
>* object
,
2812 unsigned int data_shndx
,
2813 unsigned int sh_type
,
2814 const unsigned char* prelocs
,
2816 Output_section
* output_section
,
2817 bool needs_special_offset_handling
,
2818 size_t local_symbol_count
,
2819 const unsigned char* plocal_symbols
);
2821 // Scan the relocations to look for symbol adjustments.
2823 scan_relocs(Symbol_table
* symtab
,
2825 Sized_relobj_file
<size
, big_endian
>* object
,
2826 unsigned int data_shndx
,
2827 unsigned int sh_type
,
2828 const unsigned char* prelocs
,
2830 Output_section
* output_section
,
2831 bool needs_special_offset_handling
,
2832 size_t local_symbol_count
,
2833 const unsigned char* plocal_symbols
);
2835 // Finalize the sections.
2837 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2839 // Return the value to use for a dynamic which requires special
2842 do_dynsym_value(const Symbol
*) const;
2844 // Relocate a section.
2846 relocate_section(const Relocate_info
<size
, big_endian
>*,
2847 unsigned int sh_type
,
2848 const unsigned char* prelocs
,
2850 Output_section
* output_section
,
2851 bool needs_special_offset_handling
,
2852 unsigned char* view
,
2853 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2854 section_size_type view_size
,
2855 const Reloc_symbol_changes
*);
2857 // Scan the relocs during a relocatable link.
2859 scan_relocatable_relocs(Symbol_table
* symtab
,
2861 Sized_relobj_file
<size
, big_endian
>* object
,
2862 unsigned int data_shndx
,
2863 unsigned int sh_type
,
2864 const unsigned char* prelocs
,
2866 Output_section
* output_section
,
2867 bool needs_special_offset_handling
,
2868 size_t local_symbol_count
,
2869 const unsigned char* plocal_symbols
,
2870 Relocatable_relocs
*);
2872 // Relocate a section during a relocatable link.
2875 const Relocate_info
<size
, big_endian
>*,
2876 unsigned int sh_type
,
2877 const unsigned char* prelocs
,
2879 Output_section
* output_section
,
2880 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
2881 const Relocatable_relocs
*,
2882 unsigned char* view
,
2883 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2884 section_size_type view_size
,
2885 unsigned char* reloc_view
,
2886 section_size_type reloc_view_size
);
2888 // Return the symbol index to use for a target specific relocation.
2889 // The only target specific relocation is R_AARCH64_TLSDESC for a
2890 // local symbol, which is an absolute reloc.
2892 do_reloc_symbol_index(void*, unsigned int r_type
) const
2894 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
2898 // Return the addend to use for a target specific relocation.
2900 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
2902 // Return the PLT section.
2904 do_plt_address_for_global(const Symbol
* gsym
) const
2905 { return this->plt_section()->address_for_global(gsym
); }
2908 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
2909 { return this->plt_section()->address_for_local(relobj
, symndx
); }
2911 // This function should be defined in targets that can use relocation
2912 // types to determine (implemented in local_reloc_may_be_function_pointer
2913 // and global_reloc_may_be_function_pointer)
2914 // if a function's pointer is taken. ICF uses this in safe mode to only
2915 // fold those functions whose pointer is defintely not taken.
2917 do_can_check_for_function_pointers() const
2920 // Return the number of entries in the PLT.
2922 plt_entry_count() const;
2924 //Return the offset of the first non-reserved PLT entry.
2926 first_plt_entry_offset() const;
2928 // Return the size of each PLT entry.
2930 plt_entry_size() const;
2932 // Create a stub table.
2934 new_stub_table(The_aarch64_input_section
*);
2936 // Create an aarch64 input section.
2937 The_aarch64_input_section
*
2938 new_aarch64_input_section(Relobj
*, unsigned int);
2940 // Find an aarch64 input section instance for a given OBJ and SHNDX.
2941 The_aarch64_input_section
*
2942 find_aarch64_input_section(Relobj
*, unsigned int) const;
2944 // Return the thread control block size.
2946 tcb_size() const { return This::TCB_SIZE
; }
2948 // Scan a section for stub generation.
2950 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
2951 const unsigned char*, size_t, Output_section
*,
2952 bool, const unsigned char*,
2956 // Scan a relocation section for stub.
2957 template<int sh_type
>
2959 scan_reloc_section_for_stubs(
2960 const The_relocate_info
* relinfo
,
2961 const unsigned char* prelocs
,
2963 Output_section
* output_section
,
2964 bool needs_special_offset_handling
,
2965 const unsigned char* view
,
2966 Address view_address
,
2969 // Relocate a single stub.
2971 relocate_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
2972 Output_section
*, unsigned char*, Address
,
2975 // Get the default AArch64 target.
2979 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
2980 && parameters
->target().get_size() == size
2981 && parameters
->target().is_big_endian() == big_endian
);
2982 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
2986 // Scan erratum 843419 for a part of a section.
2988 scan_erratum_843419_span(
2989 AArch64_relobj
<size
, big_endian
>*,
2991 const section_size_type
,
2992 const section_size_type
,
2996 // Scan erratum 835769 for a part of a section.
2998 scan_erratum_835769_span(
2999 AArch64_relobj
<size
, big_endian
>*,
3001 const section_size_type
,
3002 const section_size_type
,
3008 do_select_as_default_target()
3010 gold_assert(aarch64_reloc_property_table
== NULL
);
3011 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
3014 // Add a new reloc argument, returning the index in the vector.
3016 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
3019 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
3020 return this->tlsdesc_reloc_info_
.size() - 1;
3023 virtual Output_data_plt_aarch64
<size
, big_endian
>*
3024 do_make_data_plt(Layout
* layout
,
3025 Output_data_got_aarch64
<size
, big_endian
>* got
,
3026 Output_data_space
* got_plt
,
3027 Output_data_space
* got_irelative
)
3029 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
3030 layout
, got
, got_plt
, got_irelative
);
3034 // do_make_elf_object to override the same function in the base class.
3036 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
3037 const elfcpp::Ehdr
<size
, big_endian
>&);
3039 Output_data_plt_aarch64
<size
, big_endian
>*
3040 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 this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
3048 // We only need to generate stubs, and hence perform relaxation if we are
3049 // not doing relocatable linking.
3051 do_may_relax() const
3052 { return !parameters
->options().relocatable(); }
3054 // Relaxation hook. This is where we do stub generation.
3056 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
3059 group_sections(Layout
* layout
,
3060 section_size_type group_size
,
3061 bool stubs_always_after_branch
,
3065 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
3066 const Sized_symbol
<size
>*, unsigned int,
3067 const Symbol_value
<size
>*,
3068 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
3071 // Make an output section.
3073 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
3074 elfcpp::Elf_Xword flags
)
3075 { return new The_aarch64_output_section(name
, type
, flags
); }
3078 // The class which scans relocations.
3083 : issued_non_pic_error_(false)
3087 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3088 Sized_relobj_file
<size
, big_endian
>* object
,
3089 unsigned int data_shndx
,
3090 Output_section
* output_section
,
3091 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3092 const elfcpp::Sym
<size
, big_endian
>& lsym
,
3096 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
3097 Sized_relobj_file
<size
, big_endian
>* object
,
3098 unsigned int data_shndx
,
3099 Output_section
* output_section
,
3100 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
3104 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3105 Target_aarch64
<size
, big_endian
>* ,
3106 Sized_relobj_file
<size
, big_endian
>* ,
3109 const elfcpp::Rela
<size
, big_endian
>& ,
3110 unsigned int r_type
,
3111 const elfcpp::Sym
<size
, big_endian
>&);
3114 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
3115 Target_aarch64
<size
, big_endian
>* ,
3116 Sized_relobj_file
<size
, big_endian
>* ,
3119 const elfcpp::Rela
<size
, big_endian
>& ,
3120 unsigned int r_type
,
3125 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3126 unsigned int r_type
);
3129 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3130 unsigned int r_type
, Symbol
*);
3133 possible_function_pointer_reloc(unsigned int r_type
);
3136 check_non_pic(Relobj
*, unsigned int r_type
);
3139 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3140 unsigned int r_type
);
3142 // Whether we have issued an error about a non-PIC compilation.
3143 bool issued_non_pic_error_
;
3146 // The class which implements relocation.
3151 : skip_call_tls_get_addr_(false)
3157 // Do a relocation. Return false if the caller should not issue
3158 // any warnings about this relocation.
3160 relocate(const Relocate_info
<size
, big_endian
>*, Target_aarch64
*,
3162 size_t relnum
, const elfcpp::Rela
<size
, big_endian
>&,
3163 unsigned int r_type
, const Sized_symbol
<size
>*,
3164 const Symbol_value
<size
>*,
3165 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3169 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3170 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3171 Target_aarch64
<size
, big_endian
>*,
3173 const elfcpp::Rela
<size
, big_endian
>&,
3174 unsigned int r_type
, const Sized_symbol
<size
>*,
3175 const Symbol_value
<size
>*,
3177 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3179 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3181 const Relocate_info
<size
, big_endian
>*,
3182 Target_aarch64
<size
, big_endian
>*,
3183 const elfcpp::Rela
<size
, big_endian
>&,
3186 const Symbol_value
<size
>*);
3188 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3190 const Relocate_info
<size
, big_endian
>*,
3191 Target_aarch64
<size
, big_endian
>*,
3192 const elfcpp::Rela
<size
, big_endian
>&,
3195 const Symbol_value
<size
>*);
3197 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3199 const Relocate_info
<size
, big_endian
>*,
3200 Target_aarch64
<size
, big_endian
>*,
3201 const elfcpp::Rela
<size
, big_endian
>&,
3204 const Symbol_value
<size
>*);
3206 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3208 const Relocate_info
<size
, big_endian
>*,
3209 Target_aarch64
<size
, big_endian
>*,
3210 const elfcpp::Rela
<size
, big_endian
>&,
3213 const Symbol_value
<size
>*);
3215 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3217 const Relocate_info
<size
, big_endian
>*,
3218 Target_aarch64
<size
, big_endian
>*,
3219 const elfcpp::Rela
<size
, big_endian
>&,
3222 const Symbol_value
<size
>*,
3223 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3224 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3226 bool skip_call_tls_get_addr_
;
3228 }; // End of class Relocate
3230 // A class which returns the size required for a relocation type,
3231 // used while scanning relocs during a relocatable link.
3232 class Relocatable_size_for_reloc
3236 get_size_for_reloc(unsigned int, Relobj
*);
3239 // Adjust TLS relocation type based on the options and whether this
3240 // is a local symbol.
3241 static tls::Tls_optimization
3242 optimize_tls_reloc(bool is_final
, int r_type
);
3244 // Get the GOT section, creating it if necessary.
3245 Output_data_got_aarch64
<size
, big_endian
>*
3246 got_section(Symbol_table
*, Layout
*);
3248 // Get the GOT PLT section.
3250 got_plt_section() const
3252 gold_assert(this->got_plt_
!= NULL
);
3253 return this->got_plt_
;
3256 // Get the GOT section for TLSDESC entries.
3257 Output_data_got
<size
, big_endian
>*
3258 got_tlsdesc_section() const
3260 gold_assert(this->got_tlsdesc_
!= NULL
);
3261 return this->got_tlsdesc_
;
3264 // Create the PLT section.
3266 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3268 // Create a PLT entry for a global symbol.
3270 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3272 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3274 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3275 Sized_relobj_file
<size
, big_endian
>* relobj
,
3276 unsigned int local_sym_index
);
3278 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3280 define_tls_base_symbol(Symbol_table
*, Layout
*);
3282 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3284 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3286 // Create a GOT entry for the TLS module index.
3288 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3289 Sized_relobj_file
<size
, big_endian
>* object
);
3291 // Get the PLT section.
3292 Output_data_plt_aarch64
<size
, big_endian
>*
3295 gold_assert(this->plt_
!= NULL
);
3299 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769. For
3300 // ST_E_843419, we need an additional field for adrp offset.
3301 void create_erratum_stub(
3302 AArch64_relobj
<size
, big_endian
>* relobj
,
3304 section_size_type erratum_insn_offset
,
3305 Address erratum_address
,
3306 typename
Insn_utilities::Insntype erratum_insn
,
3308 unsigned int e843419_adrp_offset
=0);
3310 // Return whether this is a 3-insn erratum sequence.
3311 bool is_erratum_843419_sequence(
3312 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3313 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3314 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3316 // Return whether this is a 835769 sequence.
3317 // (Similarly implemented as in elfnn-aarch64.c.)
3318 bool is_erratum_835769_sequence(
3319 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3320 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3322 // Get the dynamic reloc section, creating it if necessary.
3324 rela_dyn_section(Layout
*);
3326 // Get the section to use for TLSDESC relocations.
3328 rela_tlsdesc_section(Layout
*) const;
3330 // Get the section to use for IRELATIVE relocations.
3332 rela_irelative_section(Layout
*);
3334 // Add a potential copy relocation.
3336 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3337 Sized_relobj_file
<size
, big_endian
>* object
,
3338 unsigned int shndx
, Output_section
* output_section
,
3339 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3341 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3342 symtab
->get_sized_symbol
<size
>(sym
),
3343 object
, shndx
, output_section
,
3344 reloc
, this->rela_dyn_section(layout
));
3347 // Information about this specific target which we pass to the
3348 // general Target structure.
3349 static const Target::Target_info aarch64_info
;
3351 // The types of GOT entries needed for this platform.
3352 // These values are exposed to the ABI in an incremental link.
3353 // Do not renumber existing values without changing the version
3354 // number of the .gnu_incremental_inputs section.
3357 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3358 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3359 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3360 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3363 // This type is used as the argument to the target specific
3364 // relocation routines. The only target specific reloc is
3365 // R_AARCh64_TLSDESC against a local symbol.
3368 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3369 unsigned int a_r_sym
)
3370 : object(a_object
), r_sym(a_r_sym
)
3373 // The object in which the local symbol is defined.
3374 Sized_relobj_file
<size
, big_endian
>* object
;
3375 // The local symbol index in the object.
3380 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3382 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3383 // The GOT PLT section.
3384 Output_data_space
* got_plt_
;
3385 // The GOT section for IRELATIVE relocations.
3386 Output_data_space
* got_irelative_
;
3387 // The GOT section for TLSDESC relocations.
3388 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3389 // The _GLOBAL_OFFSET_TABLE_ symbol.
3390 Symbol
* global_offset_table_
;
3391 // The dynamic reloc section.
3392 Reloc_section
* rela_dyn_
;
3393 // The section to use for IRELATIVE relocs.
3394 Reloc_section
* rela_irelative_
;
3395 // Relocs saved to avoid a COPY reloc.
3396 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3397 // Offset of the GOT entry for the TLS module index.
3398 unsigned int got_mod_index_offset_
;
3399 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3400 // specific relocation. Here we store the object and local symbol
3401 // index for the relocation.
3402 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3403 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3404 bool tls_base_symbol_defined_
;
3405 // List of stub_tables
3406 Stub_table_list stub_tables_
;
3407 // Actual stub group size
3408 section_size_type stub_group_size_
;
3409 AArch64_input_section_map aarch64_input_section_map_
;
3410 }; // End of Target_aarch64
3414 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3417 false, // is_big_endian
3418 elfcpp::EM_AARCH64
, // machine_code
3419 false, // has_make_symbol
3420 false, // has_resolve
3421 false, // has_code_fill
3422 true, // is_default_stack_executable
3423 true, // can_icf_inline_merge_sections
3425 "/lib/ld.so.1", // program interpreter
3426 0x400000, // default_text_segment_address
3427 0x10000, // abi_pagesize (overridable by -z max-page-size)
3428 0x1000, // common_pagesize (overridable by -z common-page-size)
3429 false, // isolate_execinstr
3431 elfcpp::SHN_UNDEF
, // small_common_shndx
3432 elfcpp::SHN_UNDEF
, // large_common_shndx
3433 0, // small_common_section_flags
3434 0, // large_common_section_flags
3435 NULL
, // attributes_section
3436 NULL
, // attributes_vendor
3437 "_start" // entry_symbol_name
3441 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3444 false, // is_big_endian
3445 elfcpp::EM_AARCH64
, // machine_code
3446 false, // has_make_symbol
3447 false, // has_resolve
3448 false, // has_code_fill
3449 true, // is_default_stack_executable
3450 false, // can_icf_inline_merge_sections
3452 "/lib/ld.so.1", // program interpreter
3453 0x400000, // default_text_segment_address
3454 0x10000, // abi_pagesize (overridable by -z max-page-size)
3455 0x1000, // common_pagesize (overridable by -z common-page-size)
3456 false, // isolate_execinstr
3458 elfcpp::SHN_UNDEF
, // small_common_shndx
3459 elfcpp::SHN_UNDEF
, // large_common_shndx
3460 0, // small_common_section_flags
3461 0, // large_common_section_flags
3462 NULL
, // attributes_section
3463 NULL
, // attributes_vendor
3464 "_start" // entry_symbol_name
3468 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3471 true, // is_big_endian
3472 elfcpp::EM_AARCH64
, // machine_code
3473 false, // has_make_symbol
3474 false, // has_resolve
3475 false, // has_code_fill
3476 true, // is_default_stack_executable
3477 true, // can_icf_inline_merge_sections
3479 "/lib/ld.so.1", // program interpreter
3480 0x400000, // default_text_segment_address
3481 0x10000, // abi_pagesize (overridable by -z max-page-size)
3482 0x1000, // common_pagesize (overridable by -z common-page-size)
3483 false, // isolate_execinstr
3485 elfcpp::SHN_UNDEF
, // small_common_shndx
3486 elfcpp::SHN_UNDEF
, // large_common_shndx
3487 0, // small_common_section_flags
3488 0, // large_common_section_flags
3489 NULL
, // attributes_section
3490 NULL
, // attributes_vendor
3491 "_start" // entry_symbol_name
3495 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3498 true, // is_big_endian
3499 elfcpp::EM_AARCH64
, // machine_code
3500 false, // has_make_symbol
3501 false, // has_resolve
3502 false, // has_code_fill
3503 true, // is_default_stack_executable
3504 false, // can_icf_inline_merge_sections
3506 "/lib/ld.so.1", // program interpreter
3507 0x400000, // default_text_segment_address
3508 0x10000, // abi_pagesize (overridable by -z max-page-size)
3509 0x1000, // common_pagesize (overridable by -z common-page-size)
3510 false, // isolate_execinstr
3512 elfcpp::SHN_UNDEF
, // small_common_shndx
3513 elfcpp::SHN_UNDEF
, // large_common_shndx
3514 0, // small_common_section_flags
3515 0, // large_common_section_flags
3516 NULL
, // attributes_section
3517 NULL
, // attributes_vendor
3518 "_start" // entry_symbol_name
3521 // Get the GOT section, creating it if necessary.
3523 template<int size
, bool big_endian
>
3524 Output_data_got_aarch64
<size
, big_endian
>*
3525 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3528 if (this->got_
== NULL
)
3530 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3532 // When using -z now, we can treat .got.plt as a relro section.
3533 // Without -z now, it is modified after program startup by lazy
3535 bool is_got_plt_relro
= parameters
->options().now();
3536 Output_section_order got_order
= (is_got_plt_relro
3538 : ORDER_RELRO_LAST
);
3539 Output_section_order got_plt_order
= (is_got_plt_relro
3541 : ORDER_NON_RELRO_FIRST
);
3543 // Layout of .got and .got.plt sections.
3544 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3546 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3547 // .gotplt[1] reserved for ld.so (resolver)
3548 // .gotplt[2] reserved
3550 // Generate .got section.
3551 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3553 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3554 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3555 this->got_
, got_order
, true);
3556 // The first word of GOT is reserved for the address of .dynamic.
3557 // We put 0 here now. The value will be replaced later in
3558 // Output_data_got_aarch64::do_write.
3559 this->got_
->add_constant(0);
3561 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3562 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3563 // even if there is a .got.plt section.
3564 this->global_offset_table_
=
3565 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3566 Symbol_table::PREDEFINED
,
3568 0, 0, elfcpp::STT_OBJECT
,
3570 elfcpp::STV_HIDDEN
, 0,
3573 // Generate .got.plt section.
3574 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3575 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3577 | elfcpp::SHF_WRITE
),
3578 this->got_plt_
, got_plt_order
,
3581 // The first three entries are reserved.
3582 this->got_plt_
->set_current_data_size(
3583 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3585 // If there are any IRELATIVE relocations, they get GOT entries
3586 // in .got.plt after the jump slot entries.
3587 this->got_irelative_
= new Output_data_space(size
/ 8,
3588 "** GOT IRELATIVE PLT");
3589 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3591 | elfcpp::SHF_WRITE
),
3592 this->got_irelative_
,
3596 // If there are any TLSDESC relocations, they get GOT entries in
3597 // .got.plt after the jump slot and IRELATIVE entries.
3598 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3599 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3601 | elfcpp::SHF_WRITE
),
3606 if (!is_got_plt_relro
)
3608 // Those bytes can go into the relro segment.
3609 layout
->increase_relro(
3610 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3617 // Get the dynamic reloc section, creating it if necessary.
3619 template<int size
, bool big_endian
>
3620 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3621 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3623 if (this->rela_dyn_
== NULL
)
3625 gold_assert(layout
!= NULL
);
3626 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3627 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3628 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3629 ORDER_DYNAMIC_RELOCS
, false);
3631 return this->rela_dyn_
;
3634 // Get the section to use for IRELATIVE relocs, creating it if
3635 // necessary. These go in .rela.dyn, but only after all other dynamic
3636 // relocations. They need to follow the other dynamic relocations so
3637 // that they can refer to global variables initialized by those
3640 template<int size
, bool big_endian
>
3641 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3642 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3644 if (this->rela_irelative_
== NULL
)
3646 // Make sure we have already created the dynamic reloc section.
3647 this->rela_dyn_section(layout
);
3648 this->rela_irelative_
= new Reloc_section(false);
3649 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3650 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3651 ORDER_DYNAMIC_RELOCS
, false);
3652 gold_assert(this->rela_dyn_
->output_section()
3653 == this->rela_irelative_
->output_section());
3655 return this->rela_irelative_
;
3659 // do_make_elf_object to override the same function in the base class. We need
3660 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3661 // store backend specific information. Hence we need to have our own ELF object
3664 template<int size
, bool big_endian
>
3666 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3667 const std::string
& name
,
3668 Input_file
* input_file
,
3669 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3671 int et
= ehdr
.get_e_type();
3672 // ET_EXEC files are valid input for --just-symbols/-R,
3673 // and we treat them as relocatable objects.
3674 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3675 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3676 name
, input_file
, offset
, ehdr
);
3677 else if (et
== elfcpp::ET_REL
)
3679 AArch64_relobj
<size
, big_endian
>* obj
=
3680 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3684 else if (et
== elfcpp::ET_DYN
)
3686 // Keep base implementation.
3687 Sized_dynobj
<size
, big_endian
>* obj
=
3688 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3694 gold_error(_("%s: unsupported ELF file type %d"),
3701 // Scan a relocation for stub generation.
3703 template<int size
, bool big_endian
>
3705 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3706 const Relocate_info
<size
, big_endian
>* relinfo
,
3707 unsigned int r_type
,
3708 const Sized_symbol
<size
>* gsym
,
3710 const Symbol_value
<size
>* psymval
,
3711 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3714 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3715 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3717 Symbol_value
<size
> symval
;
3720 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3721 get_reloc_property(r_type
);
3722 if (gsym
->use_plt_offset(arp
->reference_flags()))
3724 // This uses a PLT, change the symbol value.
3725 symval
.set_output_value(this->plt_section()->address()
3726 + gsym
->plt_offset());
3729 else if (gsym
->is_undefined())
3730 // There is no need to generate a stub symbol is undefined.
3734 // Get the symbol value.
3735 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3737 // Owing to pipelining, the PC relative branches below actually skip
3738 // two instructions when the branch offset is 0.
3739 Address destination
= static_cast<Address
>(-1);
3742 case elfcpp::R_AARCH64_CALL26
:
3743 case elfcpp::R_AARCH64_JUMP26
:
3744 destination
= value
+ addend
;
3750 int stub_type
= The_reloc_stub::
3751 stub_type_for_reloc(r_type
, address
, destination
);
3752 if (stub_type
== ST_NONE
)
3755 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3756 gold_assert(stub_table
!= NULL
);
3758 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3759 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3762 stub
= new The_reloc_stub(stub_type
);
3763 stub_table
->add_reloc_stub(stub
, key
);
3765 stub
->set_destination_address(destination
);
3766 } // End of Target_aarch64::scan_reloc_for_stub
3769 // This function scans a relocation section for stub generation.
3770 // The template parameter Relocate must be a class type which provides
3771 // a single function, relocate(), which implements the machine
3772 // specific part of a relocation.
3774 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3775 // SHT_REL or SHT_RELA.
3777 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3778 // of relocs. OUTPUT_SECTION is the output section.
3779 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3780 // mapped to output offsets.
3782 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3783 // VIEW_SIZE is the size. These refer to the input section, unless
3784 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3785 // the output section.
3787 template<int size
, bool big_endian
>
3788 template<int sh_type
>
3790 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3791 const Relocate_info
<size
, big_endian
>* relinfo
,
3792 const unsigned char* prelocs
,
3794 Output_section
* /*output_section*/,
3795 bool /*needs_special_offset_handling*/,
3796 const unsigned char* /*view*/,
3797 Address view_address
,
3800 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3802 const int reloc_size
=
3803 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3804 AArch64_relobj
<size
, big_endian
>* object
=
3805 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3806 unsigned int local_count
= object
->local_symbol_count();
3808 gold::Default_comdat_behavior default_comdat_behavior
;
3809 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3811 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3813 Reltype
reloc(prelocs
);
3814 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3815 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3816 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3817 if (r_type
!= elfcpp::R_AARCH64_CALL26
3818 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3821 section_offset_type offset
=
3822 convert_to_section_size_type(reloc
.get_r_offset());
3825 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3826 reloc
.get_r_addend();
3828 const Sized_symbol
<size
>* sym
;
3829 Symbol_value
<size
> symval
;
3830 const Symbol_value
<size
> *psymval
;
3831 bool is_defined_in_discarded_section
;
3833 if (r_sym
< local_count
)
3836 psymval
= object
->local_symbol(r_sym
);
3838 // If the local symbol belongs to a section we are discarding,
3839 // and that section is a debug section, try to find the
3840 // corresponding kept section and map this symbol to its
3841 // counterpart in the kept section. The symbol must not
3842 // correspond to a section we are folding.
3844 shndx
= psymval
->input_shndx(&is_ordinary
);
3845 is_defined_in_discarded_section
=
3847 && shndx
!= elfcpp::SHN_UNDEF
3848 && !object
->is_section_included(shndx
)
3849 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3851 // We need to compute the would-be final value of this local
3853 if (!is_defined_in_discarded_section
)
3855 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3856 typename
ObjType::Compute_final_local_value_status status
=
3857 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3859 if (status
== ObjType::CFLV_OK
)
3861 // Currently we cannot handle a branch to a target in
3862 // a merged section. If this is the case, issue an error
3863 // and also free the merge symbol value.
3864 if (!symval
.has_output_value())
3866 const std::string
& section_name
=
3867 object
->section_name(shndx
);
3868 object
->error(_("cannot handle branch to local %u "
3869 "in a merged section %s"),
3870 r_sym
, section_name
.c_str());
3876 // We cannot determine the final value.
3884 gsym
= object
->global_symbol(r_sym
);
3885 gold_assert(gsym
!= NULL
);
3886 if (gsym
->is_forwarder())
3887 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
3889 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
3890 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
3891 symval
.set_output_symtab_index(sym
->symtab_index());
3893 symval
.set_no_output_symtab_entry();
3895 // We need to compute the would-be final value of this global
3897 const Symbol_table
* symtab
= relinfo
->symtab
;
3898 const Sized_symbol
<size
>* sized_symbol
=
3899 symtab
->get_sized_symbol
<size
>(gsym
);
3900 Symbol_table::Compute_final_value_status status
;
3901 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3902 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
3904 // Skip this if the symbol has not output section.
3905 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
3907 symval
.set_output_value(value
);
3909 if (gsym
->type() == elfcpp::STT_TLS
)
3910 symval
.set_is_tls_symbol();
3911 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
3912 symval
.set_is_ifunc_symbol();
3915 is_defined_in_discarded_section
=
3916 (gsym
->is_defined_in_discarded_section()
3917 && gsym
->is_undefined());
3921 Symbol_value
<size
> symval2
;
3922 if (is_defined_in_discarded_section
)
3924 if (comdat_behavior
== CB_UNDETERMINED
)
3926 std::string name
= object
->section_name(relinfo
->data_shndx
);
3927 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
3929 if (comdat_behavior
== CB_PRETEND
)
3932 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3933 object
->map_to_kept_section(shndx
, &found
);
3935 symval2
.set_output_value(value
+ psymval
->input_value());
3937 symval2
.set_output_value(0);
3941 if (comdat_behavior
== CB_WARNING
)
3942 gold_warning_at_location(relinfo
, i
, offset
,
3943 _("relocation refers to discarded "
3945 symval2
.set_output_value(0);
3947 symval2
.set_no_output_symtab_entry();
3951 // If symbol is a section symbol, we don't know the actual type of
3952 // destination. Give up.
3953 if (psymval
->is_section_symbol())
3956 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
3957 addend
, view_address
+ offset
);
3958 } // End of iterating relocs in a section
3959 } // End of Target_aarch64::scan_reloc_section_for_stubs
3962 // Scan an input section for stub generation.
3964 template<int size
, bool big_endian
>
3966 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
3967 const Relocate_info
<size
, big_endian
>* relinfo
,
3968 unsigned int sh_type
,
3969 const unsigned char* prelocs
,
3971 Output_section
* output_section
,
3972 bool needs_special_offset_handling
,
3973 const unsigned char* view
,
3974 Address view_address
,
3975 section_size_type view_size
)
3977 gold_assert(sh_type
== elfcpp::SHT_RELA
);
3978 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
3983 needs_special_offset_handling
,
3990 // Relocate a single stub.
3992 template<int size
, bool big_endian
>
3993 void Target_aarch64
<size
, big_endian
>::
3994 relocate_stub(The_reloc_stub
* stub
,
3995 const The_relocate_info
*,
3997 unsigned char* view
,
4001 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
4002 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
4003 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
4005 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
4006 int insn_number
= stub
->insn_num();
4007 const uint32_t* insns
= stub
->insns();
4008 // Check the insns are really those stub insns.
4009 for (int i
= 0; i
< insn_number
; ++i
)
4011 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
4012 gold_assert(((uint32_t)insn
== insns
[i
]));
4015 Address dest
= stub
->destination_address();
4017 switch(stub
->type())
4019 case ST_ADRP_BRANCH
:
4021 // 1st reloc is ADR_PREL_PG_HI21
4022 The_reloc_functions_status status
=
4023 The_reloc_functions::adrp(view
, dest
, address
);
4024 // An error should never arise in the above step. If so, please
4025 // check 'aarch64_valid_for_adrp_p'.
4026 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4028 // 2nd reloc is ADD_ABS_LO12_NC
4029 const AArch64_reloc_property
* arp
=
4030 aarch64_reloc_property_table
->get_reloc_property(
4031 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
4032 gold_assert(arp
!= NULL
);
4033 status
= The_reloc_functions::template
4034 rela_general
<32>(view
+ 4, dest
, 0, arp
);
4035 // An error should never arise, it is an "_NC" relocation.
4036 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
4040 case ST_LONG_BRANCH_ABS
:
4041 // 1st reloc is R_AARCH64_PREL64, at offset 8
4042 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
4045 case ST_LONG_BRANCH_PCREL
:
4047 // "PC" calculation is the 2nd insn in the stub.
4048 uint64_t offset
= dest
- (address
+ 4);
4049 // Offset is placed at offset 4 and 5.
4050 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
4060 // A class to handle the PLT data.
4061 // This is an abstract base class that handles most of the linker details
4062 // but does not know the actual contents of PLT entries. The derived
4063 // classes below fill in those details.
4065 template<int size
, bool big_endian
>
4066 class Output_data_plt_aarch64
: public Output_section_data
4069 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
4071 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4073 Output_data_plt_aarch64(Layout
* layout
,
4075 Output_data_got_aarch64
<size
, big_endian
>* got
,
4076 Output_data_space
* got_plt
,
4077 Output_data_space
* got_irelative
)
4078 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
4079 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
4080 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
4081 { this->init(layout
); }
4083 // Initialize the PLT section.
4085 init(Layout
* layout
);
4087 // Add an entry to the PLT.
4089 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
4091 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
4093 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
4094 Sized_relobj_file
<size
, big_endian
>* relobj
,
4095 unsigned int local_sym_index
);
4097 // Add the relocation for a PLT entry.
4099 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
4100 unsigned int got_offset
);
4102 // Add the reserved TLSDESC_PLT entry to the PLT.
4104 reserve_tlsdesc_entry(unsigned int got_offset
)
4105 { this->tlsdesc_got_offset_
= got_offset
; }
4107 // Return true if a TLSDESC_PLT entry has been reserved.
4109 has_tlsdesc_entry() const
4110 { return this->tlsdesc_got_offset_
!= -1U; }
4112 // Return the GOT offset for the reserved TLSDESC_PLT entry.
4114 get_tlsdesc_got_offset() const
4115 { return this->tlsdesc_got_offset_
; }
4117 // Return the PLT offset of the reserved TLSDESC_PLT entry.
4119 get_tlsdesc_plt_offset() const
4121 return (this->first_plt_entry_offset() +
4122 (this->count_
+ this->irelative_count_
)
4123 * this->get_plt_entry_size());
4126 // Return the .rela.plt section data.
4129 { return this->rel_
; }
4131 // Return where the TLSDESC relocations should go.
4133 rela_tlsdesc(Layout
*);
4135 // Return where the IRELATIVE relocations should go in the PLT
4138 rela_irelative(Symbol_table
*, Layout
*);
4140 // Return whether we created a section for IRELATIVE relocations.
4142 has_irelative_section() const
4143 { return this->irelative_rel_
!= NULL
; }
4145 // Return the number of PLT entries.
4148 { return this->count_
+ this->irelative_count_
; }
4150 // Return the offset of the first non-reserved PLT entry.
4152 first_plt_entry_offset() const
4153 { return this->do_first_plt_entry_offset(); }
4155 // Return the size of a PLT entry.
4157 get_plt_entry_size() const
4158 { return this->do_get_plt_entry_size(); }
4160 // Return the reserved tlsdesc entry size.
4162 get_plt_tlsdesc_entry_size() const
4163 { return this->do_get_plt_tlsdesc_entry_size(); }
4165 // Return the PLT address to use for a global symbol.
4167 address_for_global(const Symbol
*);
4169 // Return the PLT address to use for a local symbol.
4171 address_for_local(const Relobj
*, unsigned int symndx
);
4174 // Fill in the first PLT entry.
4176 fill_first_plt_entry(unsigned char* pov
,
4177 Address got_address
,
4178 Address plt_address
)
4179 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4181 // Fill in a normal PLT entry.
4183 fill_plt_entry(unsigned char* pov
,
4184 Address got_address
,
4185 Address plt_address
,
4186 unsigned int got_offset
,
4187 unsigned int plt_offset
)
4189 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4190 got_offset
, plt_offset
);
4193 // Fill in the reserved TLSDESC PLT entry.
4195 fill_tlsdesc_entry(unsigned char* pov
,
4196 Address gotplt_address
,
4197 Address plt_address
,
4199 unsigned int tlsdesc_got_offset
,
4200 unsigned int plt_offset
)
4202 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4203 tlsdesc_got_offset
, plt_offset
);
4206 virtual unsigned int
4207 do_first_plt_entry_offset() const = 0;
4209 virtual unsigned int
4210 do_get_plt_entry_size() const = 0;
4212 virtual unsigned int
4213 do_get_plt_tlsdesc_entry_size() const = 0;
4216 do_fill_first_plt_entry(unsigned char* pov
,
4218 Address plt_addr
) = 0;
4221 do_fill_plt_entry(unsigned char* pov
,
4222 Address got_address
,
4223 Address plt_address
,
4224 unsigned int got_offset
,
4225 unsigned int plt_offset
) = 0;
4228 do_fill_tlsdesc_entry(unsigned char* pov
,
4229 Address gotplt_address
,
4230 Address plt_address
,
4232 unsigned int tlsdesc_got_offset
,
4233 unsigned int plt_offset
) = 0;
4236 do_adjust_output_section(Output_section
* os
);
4238 // Write to a map file.
4240 do_print_to_mapfile(Mapfile
* mapfile
) const
4241 { mapfile
->print_output_data(this, _("** PLT")); }
4244 // Set the final size.
4246 set_final_data_size();
4248 // Write out the PLT data.
4250 do_write(Output_file
*);
4252 // The reloc section.
4253 Reloc_section
* rel_
;
4255 // The TLSDESC relocs, if necessary. These must follow the regular
4257 Reloc_section
* tlsdesc_rel_
;
4259 // The IRELATIVE relocs, if necessary. These must follow the
4260 // regular PLT relocations.
4261 Reloc_section
* irelative_rel_
;
4263 // The .got section.
4264 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4266 // The .got.plt section.
4267 Output_data_space
* got_plt_
;
4269 // The part of the .got.plt section used for IRELATIVE relocs.
4270 Output_data_space
* got_irelative_
;
4272 // The number of PLT entries.
4273 unsigned int count_
;
4275 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4276 // follow the regular PLT entries.
4277 unsigned int irelative_count_
;
4279 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4280 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4281 // indicates an offset is not allocated.
4282 unsigned int tlsdesc_got_offset_
;
4285 // Initialize the PLT section.
4287 template<int size
, bool big_endian
>
4289 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4291 this->rel_
= new Reloc_section(false);
4292 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4293 elfcpp::SHF_ALLOC
, this->rel_
,
4294 ORDER_DYNAMIC_PLT_RELOCS
, false);
4297 template<int size
, bool big_endian
>
4299 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4302 os
->set_entsize(this->get_plt_entry_size());
4305 // Add an entry to the PLT.
4307 template<int size
, bool big_endian
>
4309 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4310 Layout
* layout
, Symbol
* gsym
)
4312 gold_assert(!gsym
->has_plt_offset());
4314 unsigned int* pcount
;
4315 unsigned int plt_reserved
;
4316 Output_section_data_build
* got
;
4318 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4319 && gsym
->can_use_relative_reloc(false))
4321 pcount
= &this->irelative_count_
;
4323 got
= this->got_irelative_
;
4327 pcount
= &this->count_
;
4328 plt_reserved
= this->first_plt_entry_offset();
4329 got
= this->got_plt_
;
4332 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4337 section_offset_type got_offset
= got
->current_data_size();
4339 // Every PLT entry needs a GOT entry which points back to the PLT
4340 // entry (this will be changed by the dynamic linker, normally
4341 // lazily when the function is called).
4342 got
->set_current_data_size(got_offset
+ size
/ 8);
4344 // Every PLT entry needs a reloc.
4345 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4347 // Note that we don't need to save the symbol. The contents of the
4348 // PLT are independent of which symbols are used. The symbols only
4349 // appear in the relocations.
4352 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4355 template<int size
, bool big_endian
>
4357 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4358 Symbol_table
* symtab
,
4360 Sized_relobj_file
<size
, big_endian
>* relobj
,
4361 unsigned int local_sym_index
)
4363 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4364 ++this->irelative_count_
;
4366 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4368 // Every PLT entry needs a GOT entry which points back to the PLT
4370 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4372 // Every PLT entry needs a reloc.
4373 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4374 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4375 elfcpp::R_AARCH64_IRELATIVE
,
4376 this->got_irelative_
, got_offset
, 0);
4381 // Add the relocation for a PLT entry.
4383 template<int size
, bool big_endian
>
4385 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4386 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4388 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4389 && gsym
->can_use_relative_reloc(false))
4391 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4392 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4393 this->got_irelative_
, got_offset
, 0);
4397 gsym
->set_needs_dynsym_entry();
4398 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4403 // Return where the TLSDESC relocations should go, creating it if
4404 // necessary. These follow the JUMP_SLOT relocations.
4406 template<int size
, bool big_endian
>
4407 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4408 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4410 if (this->tlsdesc_rel_
== NULL
)
4412 this->tlsdesc_rel_
= new Reloc_section(false);
4413 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4414 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4415 ORDER_DYNAMIC_PLT_RELOCS
, false);
4416 gold_assert(this->tlsdesc_rel_
->output_section()
4417 == this->rel_
->output_section());
4419 return this->tlsdesc_rel_
;
4422 // Return where the IRELATIVE relocations should go in the PLT. These
4423 // follow the JUMP_SLOT and the TLSDESC relocations.
4425 template<int size
, bool big_endian
>
4426 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4427 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4430 if (this->irelative_rel_
== NULL
)
4432 // Make sure we have a place for the TLSDESC relocations, in
4433 // case we see any later on.
4434 this->rela_tlsdesc(layout
);
4435 this->irelative_rel_
= new Reloc_section(false);
4436 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4437 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4438 ORDER_DYNAMIC_PLT_RELOCS
, false);
4439 gold_assert(this->irelative_rel_
->output_section()
4440 == this->rel_
->output_section());
4442 if (parameters
->doing_static_link())
4444 // A statically linked executable will only have a .rela.plt
4445 // section to hold R_AARCH64_IRELATIVE relocs for
4446 // STT_GNU_IFUNC symbols. The library will use these
4447 // symbols to locate the IRELATIVE relocs at program startup
4449 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4450 Symbol_table::PREDEFINED
,
4451 this->irelative_rel_
, 0, 0,
4452 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4453 elfcpp::STV_HIDDEN
, 0, false, true);
4454 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4455 Symbol_table::PREDEFINED
,
4456 this->irelative_rel_
, 0, 0,
4457 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4458 elfcpp::STV_HIDDEN
, 0, true, true);
4461 return this->irelative_rel_
;
4464 // Return the PLT address to use for a global symbol.
4466 template<int size
, bool big_endian
>
4468 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4471 uint64_t offset
= 0;
4472 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4473 && gsym
->can_use_relative_reloc(false))
4474 offset
= (this->first_plt_entry_offset() +
4475 this->count_
* this->get_plt_entry_size());
4476 return this->address() + offset
+ gsym
->plt_offset();
4479 // Return the PLT address to use for a local symbol. These are always
4480 // IRELATIVE relocs.
4482 template<int size
, bool big_endian
>
4484 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4485 const Relobj
* object
,
4488 return (this->address()
4489 + this->first_plt_entry_offset()
4490 + this->count_
* this->get_plt_entry_size()
4491 + object
->local_plt_offset(r_sym
));
4494 // Set the final size.
4496 template<int size
, bool big_endian
>
4498 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4500 unsigned int count
= this->count_
+ this->irelative_count_
;
4501 unsigned int extra_size
= 0;
4502 if (this->has_tlsdesc_entry())
4503 extra_size
+= this->get_plt_tlsdesc_entry_size();
4504 this->set_data_size(this->first_plt_entry_offset()
4505 + count
* this->get_plt_entry_size()
4509 template<int size
, bool big_endian
>
4510 class Output_data_plt_aarch64_standard
:
4511 public Output_data_plt_aarch64
<size
, big_endian
>
4514 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4515 Output_data_plt_aarch64_standard(
4517 Output_data_got_aarch64
<size
, big_endian
>* got
,
4518 Output_data_space
* got_plt
,
4519 Output_data_space
* got_irelative
)
4520 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4527 // Return the offset of the first non-reserved PLT entry.
4528 virtual unsigned int
4529 do_first_plt_entry_offset() const
4530 { return this->first_plt_entry_size
; }
4532 // Return the size of a PLT entry
4533 virtual unsigned int
4534 do_get_plt_entry_size() const
4535 { return this->plt_entry_size
; }
4537 // Return the size of a tlsdesc entry
4538 virtual unsigned int
4539 do_get_plt_tlsdesc_entry_size() const
4540 { return this->plt_tlsdesc_entry_size
; }
4543 do_fill_first_plt_entry(unsigned char* pov
,
4544 Address got_address
,
4545 Address plt_address
);
4548 do_fill_plt_entry(unsigned char* pov
,
4549 Address got_address
,
4550 Address plt_address
,
4551 unsigned int got_offset
,
4552 unsigned int plt_offset
);
4555 do_fill_tlsdesc_entry(unsigned char* pov
,
4556 Address gotplt_address
,
4557 Address plt_address
,
4559 unsigned int tlsdesc_got_offset
,
4560 unsigned int plt_offset
);
4563 // The size of the first plt entry size.
4564 static const int first_plt_entry_size
= 32;
4565 // The size of the plt entry size.
4566 static const int plt_entry_size
= 16;
4567 // The size of the plt tlsdesc entry size.
4568 static const int plt_tlsdesc_entry_size
= 32;
4569 // Template for the first PLT entry.
4570 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4571 // Template for subsequent PLT entries.
4572 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4573 // The reserved TLSDESC entry in the PLT for an executable.
4574 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4577 // The first entry in the PLT for an executable.
4581 Output_data_plt_aarch64_standard
<32, false>::
4582 first_plt_entry
[first_plt_entry_size
/ 4] =
4584 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4585 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4586 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4587 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4588 0xd61f0220, /* br x17 */
4589 0xd503201f, /* nop */
4590 0xd503201f, /* nop */
4591 0xd503201f, /* nop */
4597 Output_data_plt_aarch64_standard
<32, true>::
4598 first_plt_entry
[first_plt_entry_size
/ 4] =
4600 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4601 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4602 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4603 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4604 0xd61f0220, /* br x17 */
4605 0xd503201f, /* nop */
4606 0xd503201f, /* nop */
4607 0xd503201f, /* nop */
4613 Output_data_plt_aarch64_standard
<64, false>::
4614 first_plt_entry
[first_plt_entry_size
/ 4] =
4616 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4617 0x90000010, /* adrp x16, PLT_GOT+16 */
4618 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4619 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4620 0xd61f0220, /* br x17 */
4621 0xd503201f, /* nop */
4622 0xd503201f, /* nop */
4623 0xd503201f, /* nop */
4629 Output_data_plt_aarch64_standard
<64, true>::
4630 first_plt_entry
[first_plt_entry_size
/ 4] =
4632 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4633 0x90000010, /* adrp x16, PLT_GOT+16 */
4634 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4635 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4636 0xd61f0220, /* br x17 */
4637 0xd503201f, /* nop */
4638 0xd503201f, /* nop */
4639 0xd503201f, /* nop */
4645 Output_data_plt_aarch64_standard
<32, false>::
4646 plt_entry
[plt_entry_size
/ 4] =
4648 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4649 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4650 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4651 0xd61f0220, /* br x17. */
4657 Output_data_plt_aarch64_standard
<32, true>::
4658 plt_entry
[plt_entry_size
/ 4] =
4660 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4661 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4662 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4663 0xd61f0220, /* br x17. */
4669 Output_data_plt_aarch64_standard
<64, false>::
4670 plt_entry
[plt_entry_size
/ 4] =
4672 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4673 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4674 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4675 0xd61f0220, /* br x17. */
4681 Output_data_plt_aarch64_standard
<64, true>::
4682 plt_entry
[plt_entry_size
/ 4] =
4684 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4685 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4686 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4687 0xd61f0220, /* br x17. */
4691 template<int size
, bool big_endian
>
4693 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4695 Address got_address
,
4696 Address plt_address
)
4698 // PLT0 of the small PLT looks like this in ELF64 -
4699 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4700 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4701 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4703 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4704 // GOTPLT entry for this.
4706 // PLT0 will be slightly different in ELF32 due to different got entry
4708 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4709 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4711 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4712 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4713 // FIXME: This only works for 64bit
4714 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4715 gotplt_2nd_ent
, plt_address
+ 4);
4717 // Fill in R_AARCH64_LDST8_LO12
4718 elfcpp::Swap
<32, big_endian
>::writeval(
4720 ((this->first_plt_entry
[2] & 0xffc003ff)
4721 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4723 // Fill in R_AARCH64_ADD_ABS_LO12
4724 elfcpp::Swap
<32, big_endian
>::writeval(
4726 ((this->first_plt_entry
[3] & 0xffc003ff)
4727 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4731 // Subsequent entries in the PLT for an executable.
4732 // FIXME: This only works for 64bit
4734 template<int size
, bool big_endian
>
4736 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4738 Address got_address
,
4739 Address plt_address
,
4740 unsigned int got_offset
,
4741 unsigned int plt_offset
)
4743 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4745 Address gotplt_entry_address
= got_address
+ got_offset
;
4746 Address plt_entry_address
= plt_address
+ plt_offset
;
4748 // Fill in R_AARCH64_PCREL_ADR_HI21
4749 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4751 gotplt_entry_address
,
4754 // Fill in R_AARCH64_LDST64_ABS_LO12
4755 elfcpp::Swap
<32, big_endian
>::writeval(
4757 ((this->plt_entry
[1] & 0xffc003ff)
4758 | ((gotplt_entry_address
& 0xff8) << 7)));
4760 // Fill in R_AARCH64_ADD_ABS_LO12
4761 elfcpp::Swap
<32, big_endian
>::writeval(
4763 ((this->plt_entry
[2] & 0xffc003ff)
4764 | ((gotplt_entry_address
& 0xfff) <<10)));
4771 Output_data_plt_aarch64_standard
<32, false>::
4772 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4774 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4775 0x90000002, /* adrp x2, 0 */
4776 0x90000003, /* adrp x3, 0 */
4777 0xb9400042, /* ldr w2, [w2, #0] */
4778 0x11000063, /* add w3, w3, 0 */
4779 0xd61f0040, /* br x2 */
4780 0xd503201f, /* nop */
4781 0xd503201f, /* nop */
4786 Output_data_plt_aarch64_standard
<32, true>::
4787 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4789 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4790 0x90000002, /* adrp x2, 0 */
4791 0x90000003, /* adrp x3, 0 */
4792 0xb9400042, /* ldr w2, [w2, #0] */
4793 0x11000063, /* add w3, w3, 0 */
4794 0xd61f0040, /* br x2 */
4795 0xd503201f, /* nop */
4796 0xd503201f, /* nop */
4801 Output_data_plt_aarch64_standard
<64, false>::
4802 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4804 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4805 0x90000002, /* adrp x2, 0 */
4806 0x90000003, /* adrp x3, 0 */
4807 0xf9400042, /* ldr x2, [x2, #0] */
4808 0x91000063, /* add x3, x3, 0 */
4809 0xd61f0040, /* br x2 */
4810 0xd503201f, /* nop */
4811 0xd503201f, /* nop */
4816 Output_data_plt_aarch64_standard
<64, true>::
4817 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4819 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4820 0x90000002, /* adrp x2, 0 */
4821 0x90000003, /* adrp x3, 0 */
4822 0xf9400042, /* ldr x2, [x2, #0] */
4823 0x91000063, /* add x3, x3, 0 */
4824 0xd61f0040, /* br x2 */
4825 0xd503201f, /* nop */
4826 0xd503201f, /* nop */
4829 template<int size
, bool big_endian
>
4831 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4833 Address gotplt_address
,
4834 Address plt_address
,
4836 unsigned int tlsdesc_got_offset
,
4837 unsigned int plt_offset
)
4839 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4841 // move DT_TLSDESC_GOT address into x2
4842 // move .got.plt address into x3
4843 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4844 Address plt_entry_address
= plt_address
+ plt_offset
;
4846 // R_AARCH64_ADR_PREL_PG_HI21
4847 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4850 plt_entry_address
+ 4);
4852 // R_AARCH64_ADR_PREL_PG_HI21
4853 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4856 plt_entry_address
+ 8);
4858 // R_AARCH64_LDST64_ABS_LO12
4859 elfcpp::Swap
<32, big_endian
>::writeval(
4861 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4862 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4864 // R_AARCH64_ADD_ABS_LO12
4865 elfcpp::Swap
<32, big_endian
>::writeval(
4867 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
4868 | ((gotplt_address
& 0xfff) << 10)));
4871 // Write out the PLT. This uses the hand-coded instructions above,
4872 // and adjusts them as needed. This is specified by the AMD64 ABI.
4874 template<int size
, bool big_endian
>
4876 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
4878 const off_t offset
= this->offset();
4879 const section_size_type oview_size
=
4880 convert_to_section_size_type(this->data_size());
4881 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
4883 const off_t got_file_offset
= this->got_plt_
->offset();
4884 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
4885 == this->got_irelative_
->offset());
4887 const section_size_type got_size
=
4888 convert_to_section_size_type(this->got_plt_
->data_size()
4889 + this->got_irelative_
->data_size());
4890 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
4893 unsigned char* pov
= oview
;
4895 // The base address of the .plt section.
4896 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
4897 // The base address of the PLT portion of the .got section.
4898 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
4899 = this->got_plt_
->address();
4901 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
4902 pov
+= this->first_plt_entry_offset();
4904 // The first three entries in .got.plt are reserved.
4905 unsigned char* got_pov
= got_view
;
4906 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
4907 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4909 unsigned int plt_offset
= this->first_plt_entry_offset();
4910 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4911 const unsigned int count
= this->count_
+ this->irelative_count_
;
4912 for (unsigned int plt_index
= 0;
4915 pov
+= this->get_plt_entry_size(),
4916 got_pov
+= size
/ 8,
4917 plt_offset
+= this->get_plt_entry_size(),
4918 got_offset
+= size
/ 8)
4920 // Set and adjust the PLT entry itself.
4921 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
4922 got_offset
, plt_offset
);
4924 // Set the entry in the GOT, which points to plt0.
4925 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
4928 if (this->has_tlsdesc_entry())
4930 // Set and adjust the reserved TLSDESC PLT entry.
4931 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
4932 // The base address of the .base section.
4933 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
4934 this->got_
->address();
4935 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4936 tlsdesc_got_offset
, plt_offset
);
4937 pov
+= this->get_plt_tlsdesc_entry_size();
4940 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
4941 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
4943 of
->write_output_view(offset
, oview_size
, oview
);
4944 of
->write_output_view(got_file_offset
, got_size
, got_view
);
4947 // Telling how to update the immediate field of an instruction.
4948 struct AArch64_howto
4950 // The immediate field mask.
4951 elfcpp::Elf_Xword dst_mask
;
4953 // The offset to apply relocation immediate
4956 // The second part offset, if the immediate field has two parts.
4957 // -1 if the immediate field has only one part.
4961 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
4963 {0, -1, -1}, // DATA
4964 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
4965 {0xffffe0, 5, -1}, // LD [23:5]-imm19
4966 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
4967 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
4968 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
4969 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
4970 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
4971 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
4972 {0x3ffffff, 0, -1}, // B [25:0]-imm26
4973 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
4976 // AArch64 relocate function class
4978 template<int size
, bool big_endian
>
4979 class AArch64_relocate_functions
4984 STATUS_OKAY
, // No error during relocation.
4985 STATUS_OVERFLOW
, // Relocation overflow.
4986 STATUS_BAD_RELOC
, // Relocation cannot be applied.
4989 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
4990 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4991 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
4992 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
4993 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
4994 typedef Stub_table
<size
, big_endian
> The_stub_table
;
4995 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
4996 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
4998 // Return the page address of the address.
4999 // Page(address) = address & ~0xFFF
5001 static inline AArch64_valtype
5002 Page(Address address
)
5004 return (address
& (~static_cast<Address
>(0xFFF)));
5008 // Update instruction (pointed by view) with selected bits (immed).
5009 // val = (val & ~dst_mask) | (immed << doffset)
5011 template<int valsize
>
5013 update_view(unsigned char* view
,
5014 AArch64_valtype immed
,
5015 elfcpp::Elf_Xword doffset
,
5016 elfcpp::Elf_Xword dst_mask
)
5018 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5019 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5020 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5022 // Clear immediate fields.
5024 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5025 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5028 // Update two parts of an instruction (pointed by view) with selected
5029 // bits (immed1 and immed2).
5030 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
5032 template<int valsize
>
5034 update_view_two_parts(
5035 unsigned char* view
,
5036 AArch64_valtype immed1
,
5037 AArch64_valtype immed2
,
5038 elfcpp::Elf_Xword doffset1
,
5039 elfcpp::Elf_Xword doffset2
,
5040 elfcpp::Elf_Xword dst_mask
)
5042 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5043 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5044 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
5046 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
5047 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
5048 (immed2
<< doffset2
)));
5051 // Update adr or adrp instruction with immed.
5052 // In adr and adrp: [30:29] immlo [23:5] immhi
5055 update_adr(unsigned char* view
, AArch64_valtype immed
)
5057 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
5058 This::template update_view_two_parts
<32>(
5061 (immed
& 0x1ffffc) >> 2,
5067 // Update movz/movn instruction with bits immed.
5068 // Set instruction to movz if is_movz is true, otherwise set instruction
5072 update_movnz(unsigned char* view
,
5073 AArch64_valtype immed
,
5076 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
5077 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5078 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
5080 const elfcpp::Elf_Xword doffset
=
5081 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
5082 const elfcpp::Elf_Xword dst_mask
=
5083 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
5085 // Clear immediate fields and opc code.
5086 val
&= ~(dst_mask
| (0x3 << 29));
5088 // Set instruction to movz or movn.
5089 // movz: [30:29] is 10 movn: [30:29] is 00
5093 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
5094 static_cast<Valtype
>(val
| (immed
<< doffset
)));
5097 // Update selected bits in text.
5099 template<int valsize
>
5100 static inline typename
This::Status
5101 reloc_common(unsigned char* view
, Address x
,
5102 const AArch64_reloc_property
* reloc_property
)
5104 // Select bits from X.
5105 Address immed
= reloc_property
->select_x_value(x
);
5108 const AArch64_reloc_property::Reloc_inst inst
=
5109 reloc_property
->reloc_inst();
5110 // If it is a data relocation or instruction has 2 parts of immediate
5111 // fields, you should not call pcrela_general.
5112 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
5113 aarch64_howto
[inst
].doffset
!= -1);
5114 This::template update_view
<valsize
>(view
, immed
,
5115 aarch64_howto
[inst
].doffset
,
5116 aarch64_howto
[inst
].dst_mask
);
5118 // Do check overflow or alignment if needed.
5119 return (reloc_property
->checkup_x_value(x
)
5121 : This::STATUS_OVERFLOW
);
5126 // Construct a B insn. Note, although we group it here with other relocation
5127 // operation, there is actually no 'relocation' involved here.
5129 construct_b(unsigned char* view
, unsigned int branch_offset
)
5131 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5135 // Do a simple rela relocation at unaligned addresses.
5137 template<int valsize
>
5138 static inline typename
This::Status
5139 rela_ua(unsigned char* view
,
5140 const Sized_relobj_file
<size
, big_endian
>* object
,
5141 const Symbol_value
<size
>* psymval
,
5142 AArch64_valtype addend
,
5143 const AArch64_reloc_property
* reloc_property
)
5145 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5147 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5148 psymval
->value(object
, addend
);
5149 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5150 static_cast<Valtype
>(x
));
5151 return (reloc_property
->checkup_x_value(x
)
5153 : This::STATUS_OVERFLOW
);
5156 // Do a simple pc-relative relocation at unaligned addresses.
5158 template<int valsize
>
5159 static inline typename
This::Status
5160 pcrela_ua(unsigned char* view
,
5161 const Sized_relobj_file
<size
, big_endian
>* object
,
5162 const Symbol_value
<size
>* psymval
,
5163 AArch64_valtype addend
,
5165 const AArch64_reloc_property
* reloc_property
)
5167 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5169 Address x
= psymval
->value(object
, addend
) - address
;
5170 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5171 static_cast<Valtype
>(x
));
5172 return (reloc_property
->checkup_x_value(x
)
5174 : This::STATUS_OVERFLOW
);
5177 // Do a simple rela relocation at aligned addresses.
5179 template<int valsize
>
5180 static inline typename
This::Status
5182 unsigned char* view
,
5183 const Sized_relobj_file
<size
, big_endian
>* object
,
5184 const Symbol_value
<size
>* psymval
,
5185 AArch64_valtype addend
,
5186 const AArch64_reloc_property
* reloc_property
)
5188 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5189 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5190 Address x
= psymval
->value(object
, addend
);
5191 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5192 return (reloc_property
->checkup_x_value(x
)
5194 : This::STATUS_OVERFLOW
);
5197 // Do relocate. Update selected bits in text.
5198 // new_val = (val & ~dst_mask) | (immed << doffset)
5200 template<int valsize
>
5201 static inline typename
This::Status
5202 rela_general(unsigned char* view
,
5203 const Sized_relobj_file
<size
, big_endian
>* object
,
5204 const Symbol_value
<size
>* psymval
,
5205 AArch64_valtype addend
,
5206 const AArch64_reloc_property
* reloc_property
)
5208 // Calculate relocation.
5209 Address x
= psymval
->value(object
, addend
);
5210 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5213 // Do relocate. Update selected bits in text.
5214 // new val = (val & ~dst_mask) | (immed << doffset)
5216 template<int valsize
>
5217 static inline typename
This::Status
5219 unsigned char* view
,
5221 AArch64_valtype addend
,
5222 const AArch64_reloc_property
* reloc_property
)
5224 // Calculate relocation.
5225 Address x
= s
+ addend
;
5226 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5229 // Do address relative relocate. Update selected bits in text.
5230 // new val = (val & ~dst_mask) | (immed << doffset)
5232 template<int valsize
>
5233 static inline typename
This::Status
5235 unsigned char* view
,
5236 const Sized_relobj_file
<size
, big_endian
>* object
,
5237 const Symbol_value
<size
>* psymval
,
5238 AArch64_valtype addend
,
5240 const AArch64_reloc_property
* reloc_property
)
5242 // Calculate relocation.
5243 Address x
= psymval
->value(object
, addend
) - address
;
5244 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5248 // Calculate (S + A) - address, update adr instruction.
5250 static inline typename
This::Status
5251 adr(unsigned char* view
,
5252 const Sized_relobj_file
<size
, big_endian
>* object
,
5253 const Symbol_value
<size
>* psymval
,
5256 const AArch64_reloc_property
* /* reloc_property */)
5258 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5259 // Pick bits [20:0] of X.
5260 AArch64_valtype immed
= x
& 0x1fffff;
5261 update_adr(view
, immed
);
5262 // Check -2^20 <= X < 2^20
5263 return (size
== 64 && Bits
<21>::has_overflow((x
))
5264 ? This::STATUS_OVERFLOW
5265 : This::STATUS_OKAY
);
5268 // Calculate PG(S+A) - PG(address), update adrp instruction.
5269 // R_AARCH64_ADR_PREL_PG_HI21
5271 static inline typename
This::Status
5273 unsigned char* view
,
5277 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5278 // Pick [32:12] of X.
5279 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5280 update_adr(view
, immed
);
5281 // Check -2^32 <= X < 2^32
5282 return (size
== 64 && Bits
<33>::has_overflow((x
))
5283 ? This::STATUS_OVERFLOW
5284 : This::STATUS_OKAY
);
5287 // Calculate PG(S+A) - PG(address), update adrp instruction.
5288 // R_AARCH64_ADR_PREL_PG_HI21
5290 static inline typename
This::Status
5291 adrp(unsigned char* view
,
5292 const Sized_relobj_file
<size
, big_endian
>* object
,
5293 const Symbol_value
<size
>* psymval
,
5296 const AArch64_reloc_property
* reloc_property
)
5298 Address sa
= psymval
->value(object
, addend
);
5299 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5300 // Pick [32:12] of X.
5301 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5302 update_adr(view
, immed
);
5303 return (reloc_property
->checkup_x_value(x
)
5305 : This::STATUS_OVERFLOW
);
5308 // Update mov[n/z] instruction. Check overflow if needed.
5309 // If X >=0, set the instruction to movz and its immediate value to the
5311 // If X < 0, set the instruction to movn and its immediate value to
5312 // NOT (selected bits of).
5314 static inline typename
This::Status
5315 movnz(unsigned char* view
,
5317 const AArch64_reloc_property
* reloc_property
)
5319 // Select bits from X.
5322 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5323 if (static_cast<SignedW
>(x
) >= 0)
5325 immed
= reloc_property
->select_x_value(x
);
5330 immed
= reloc_property
->select_x_value(~x
);;
5334 // Update movnz instruction.
5335 update_movnz(view
, immed
, is_movz
);
5337 // Do check overflow or alignment if needed.
5338 return (reloc_property
->checkup_x_value(x
)
5340 : This::STATUS_OVERFLOW
);
5344 maybe_apply_stub(unsigned int,
5345 const The_relocate_info
*,
5349 const Sized_symbol
<size
>*,
5350 const Symbol_value
<size
>*,
5351 const Sized_relobj_file
<size
, big_endian
>*,
5354 }; // End of AArch64_relocate_functions
5357 // For a certain relocation type (usually jump/branch), test to see if the
5358 // destination needs a stub to fulfil. If so, re-route the destination of the
5359 // original instruction to the stub, note, at this time, the stub has already
5362 template<int size
, bool big_endian
>
5364 AArch64_relocate_functions
<size
, big_endian
>::
5365 maybe_apply_stub(unsigned int r_type
,
5366 const The_relocate_info
* relinfo
,
5367 const The_rela
& rela
,
5368 unsigned char* view
,
5370 const Sized_symbol
<size
>* gsym
,
5371 const Symbol_value
<size
>* psymval
,
5372 const Sized_relobj_file
<size
, big_endian
>* object
,
5373 section_size_type current_group_size
)
5375 if (parameters
->options().relocatable())
5378 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5379 Address branch_target
= psymval
->value(object
, 0) + addend
;
5381 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5382 if (stub_type
== ST_NONE
)
5385 const The_aarch64_relobj
* aarch64_relobj
=
5386 static_cast<const The_aarch64_relobj
*>(object
);
5387 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5388 gold_assert(stub_table
!= NULL
);
5390 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5391 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5392 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5393 gold_assert(stub
!= NULL
);
5395 Address new_branch_target
= stub_table
->address() + stub
->offset();
5396 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5397 new_branch_target
- address
;
5398 const AArch64_reloc_property
* arp
=
5399 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5400 gold_assert(arp
!= NULL
);
5401 typename
This::Status status
= This::template
5402 rela_general
<32>(view
, branch_offset
, 0, arp
);
5403 if (status
!= This::STATUS_OKAY
)
5404 gold_error(_("Stub is too far away, try a smaller value "
5405 "for '--stub-group-size'. The current value is 0x%lx."),
5406 static_cast<unsigned long>(current_group_size
));
5411 // Group input sections for stub generation.
5413 // We group input sections in an output section so that the total size,
5414 // including any padding space due to alignment is smaller than GROUP_SIZE
5415 // unless the only input section in group is bigger than GROUP_SIZE already.
5416 // Then an ARM stub table is created to follow the last input section
5417 // in group. For each group an ARM stub table is created an is placed
5418 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5419 // extend the group after the stub table.
5421 template<int size
, bool big_endian
>
5423 Target_aarch64
<size
, big_endian
>::group_sections(
5425 section_size_type group_size
,
5426 bool stubs_always_after_branch
,
5429 // Group input sections and insert stub table
5430 Layout::Section_list section_list
;
5431 layout
->get_executable_sections(§ion_list
);
5432 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5433 p
!= section_list
.end();
5436 AArch64_output_section
<size
, big_endian
>* output_section
=
5437 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5438 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5444 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5445 // section of RELOBJ.
5447 template<int size
, bool big_endian
>
5448 AArch64_input_section
<size
, big_endian
>*
5449 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5450 Relobj
* relobj
, unsigned int shndx
) const
5452 Section_id
sid(relobj
, shndx
);
5453 typename
AArch64_input_section_map::const_iterator p
=
5454 this->aarch64_input_section_map_
.find(sid
);
5455 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5459 // Make a new AArch64_input_section object.
5461 template<int size
, bool big_endian
>
5462 AArch64_input_section
<size
, big_endian
>*
5463 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5464 Relobj
* relobj
, unsigned int shndx
)
5466 Section_id
sid(relobj
, shndx
);
5468 AArch64_input_section
<size
, big_endian
>* input_section
=
5469 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5470 input_section
->init();
5472 // Register new AArch64_input_section in map for look-up.
5473 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5474 this->aarch64_input_section_map_
.insert(
5475 std::make_pair(sid
, input_section
));
5477 // Make sure that it we have not created another AArch64_input_section
5478 // for this input section already.
5479 gold_assert(ins
.second
);
5481 return input_section
;
5485 // Relaxation hook. This is where we do stub generation.
5487 template<int size
, bool big_endian
>
5489 Target_aarch64
<size
, big_endian
>::do_relax(
5491 const Input_objects
* input_objects
,
5492 Symbol_table
* symtab
,
5496 gold_assert(!parameters
->options().relocatable());
5499 // We don't handle negative stub_group_size right now.
5500 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5501 if (this->stub_group_size_
== 1)
5503 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5504 // will fail to link. The user will have to relink with an explicit
5505 // group size option.
5506 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5509 group_sections(layout
, this->stub_group_size_
, true, task
);
5513 // If this is not the first pass, addresses and file offsets have
5514 // been reset at this point, set them here.
5515 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5516 sp
!= this->stub_tables_
.end(); ++sp
)
5518 The_stub_table
* stt
= *sp
;
5519 The_aarch64_input_section
* owner
= stt
->owner();
5520 off_t off
= align_address(owner
->original_size(),
5522 stt
->set_address_and_file_offset(owner
->address() + off
,
5523 owner
->offset() + off
);
5527 // Scan relocs for relocation stubs
5528 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5529 op
!= input_objects
->relobj_end();
5532 The_aarch64_relobj
* aarch64_relobj
=
5533 static_cast<The_aarch64_relobj
*>(*op
);
5534 // Lock the object so we can read from it. This is only called
5535 // single-threaded from Layout::finalize, so it is OK to lock.
5536 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5537 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5540 bool any_stub_table_changed
= false;
5541 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5542 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5544 The_stub_table
* stub_table
= *siter
;
5545 if (stub_table
->update_data_size_changed_p())
5547 The_aarch64_input_section
* owner
= stub_table
->owner();
5548 uint64_t address
= owner
->address();
5549 off_t offset
= owner
->offset();
5550 owner
->reset_address_and_file_offset();
5551 owner
->set_address_and_file_offset(address
, offset
);
5553 any_stub_table_changed
= true;
5557 // Do not continue relaxation.
5558 bool continue_relaxation
= any_stub_table_changed
;
5559 if (!continue_relaxation
)
5560 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5561 (sp
!= this->stub_tables_
.end());
5563 (*sp
)->finalize_stubs();
5565 return continue_relaxation
;
5569 // Make a new Stub_table.
5571 template<int size
, bool big_endian
>
5572 Stub_table
<size
, big_endian
>*
5573 Target_aarch64
<size
, big_endian
>::new_stub_table(
5574 AArch64_input_section
<size
, big_endian
>* owner
)
5576 Stub_table
<size
, big_endian
>* stub_table
=
5577 new Stub_table
<size
, big_endian
>(owner
);
5578 stub_table
->set_address(align_address(
5579 owner
->address() + owner
->data_size(), 8));
5580 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5581 stub_table
->finalize_data_size();
5583 this->stub_tables_
.push_back(stub_table
);
5589 template<int size
, bool big_endian
>
5591 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5592 void* arg
, unsigned int r_type
, uint64_t) const
5594 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5595 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5596 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5597 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5598 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5599 gold_assert(psymval
->is_tls_symbol());
5600 // The value of a TLS symbol is the offset in the TLS segment.
5601 return psymval
->value(ti
.object
, 0);
5604 // Return the number of entries in the PLT.
5606 template<int size
, bool big_endian
>
5608 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5610 if (this->plt_
== NULL
)
5612 return this->plt_
->entry_count();
5615 // Return the offset of the first non-reserved PLT entry.
5617 template<int size
, bool big_endian
>
5619 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5621 return this->plt_
->first_plt_entry_offset();
5624 // Return the size of each PLT entry.
5626 template<int size
, bool big_endian
>
5628 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5630 return this->plt_
->get_plt_entry_size();
5633 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5635 template<int size
, bool big_endian
>
5637 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5638 Symbol_table
* symtab
, Layout
* layout
)
5640 if (this->tls_base_symbol_defined_
)
5643 Output_segment
* tls_segment
= layout
->tls_segment();
5644 if (tls_segment
!= NULL
)
5646 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5647 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5648 Symbol_table::PREDEFINED
,
5652 elfcpp::STV_HIDDEN
, 0,
5653 Symbol::SEGMENT_START
,
5656 this->tls_base_symbol_defined_
= true;
5659 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5661 template<int size
, bool big_endian
>
5663 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5664 Symbol_table
* symtab
, Layout
* layout
)
5666 if (this->plt_
== NULL
)
5667 this->make_plt_section(symtab
, layout
);
5669 if (!this->plt_
->has_tlsdesc_entry())
5671 // Allocate the TLSDESC_GOT entry.
5672 Output_data_got_aarch64
<size
, big_endian
>* got
=
5673 this->got_section(symtab
, layout
);
5674 unsigned int got_offset
= got
->add_constant(0);
5676 // Allocate the TLSDESC_PLT entry.
5677 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5681 // Create a GOT entry for the TLS module index.
5683 template<int size
, bool big_endian
>
5685 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5686 Symbol_table
* symtab
, Layout
* layout
,
5687 Sized_relobj_file
<size
, big_endian
>* object
)
5689 if (this->got_mod_index_offset_
== -1U)
5691 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5692 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5693 Output_data_got_aarch64
<size
, big_endian
>* got
=
5694 this->got_section(symtab
, layout
);
5695 unsigned int got_offset
= got
->add_constant(0);
5696 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5698 got
->add_constant(0);
5699 this->got_mod_index_offset_
= got_offset
;
5701 return this->got_mod_index_offset_
;
5704 // Optimize the TLS relocation type based on what we know about the
5705 // symbol. IS_FINAL is true if the final address of this symbol is
5706 // known at link time.
5708 template<int size
, bool big_endian
>
5709 tls::Tls_optimization
5710 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5713 // If we are generating a shared library, then we can't do anything
5715 if (parameters
->options().shared())
5716 return tls::TLSOPT_NONE
;
5720 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5721 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5722 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5723 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5724 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5725 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5726 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5727 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5728 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5729 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5730 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5731 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5732 // These are General-Dynamic which permits fully general TLS
5733 // access. Since we know that we are generating an executable,
5734 // we can convert this to Initial-Exec. If we also know that
5735 // this is a local symbol, we can further switch to Local-Exec.
5737 return tls::TLSOPT_TO_LE
;
5738 return tls::TLSOPT_TO_IE
;
5740 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5741 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5742 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5743 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5744 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5745 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5746 // These are Local-Dynamic, which refer to local symbols in the
5747 // dynamic TLS block. Since we know that we generating an
5748 // executable, we can switch to Local-Exec.
5749 return tls::TLSOPT_TO_LE
;
5751 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5752 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5753 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5754 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5755 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5756 // These are Initial-Exec relocs which get the thread offset
5757 // from the GOT. If we know that we are linking against the
5758 // local symbol, we can switch to Local-Exec, which links the
5759 // thread offset into the instruction.
5761 return tls::TLSOPT_TO_LE
;
5762 return tls::TLSOPT_NONE
;
5764 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5765 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5766 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5767 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5768 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5769 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5770 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5771 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5772 // When we already have Local-Exec, there is nothing further we
5774 return tls::TLSOPT_NONE
;
5781 // Returns true if this relocation type could be that of a function pointer.
5783 template<int size
, bool big_endian
>
5785 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5786 unsigned int r_type
)
5790 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5791 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5792 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5793 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5794 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5802 // For safe ICF, scan a relocation for a local symbol to check if it
5803 // corresponds to a function pointer being taken. In that case mark
5804 // the function whose pointer was taken as not foldable.
5806 template<int size
, bool big_endian
>
5808 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5811 Target_aarch64
<size
, big_endian
>* ,
5812 Sized_relobj_file
<size
, big_endian
>* ,
5815 const elfcpp::Rela
<size
, big_endian
>& ,
5816 unsigned int r_type
,
5817 const elfcpp::Sym
<size
, big_endian
>&)
5819 // When building a shared library, do not fold any local symbols.
5820 return (parameters
->options().shared()
5821 || possible_function_pointer_reloc(r_type
));
5824 // For safe ICF, scan a relocation for a global symbol to check if it
5825 // corresponds to a function pointer being taken. In that case mark
5826 // the function whose pointer was taken as not foldable.
5828 template<int size
, bool big_endian
>
5830 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5833 Target_aarch64
<size
, big_endian
>* ,
5834 Sized_relobj_file
<size
, big_endian
>* ,
5837 const elfcpp::Rela
<size
, big_endian
>& ,
5838 unsigned int r_type
,
5841 // When building a shared library, do not fold symbols whose visibility
5842 // is hidden, internal or protected.
5843 return ((parameters
->options().shared()
5844 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5845 || gsym
->visibility() == elfcpp::STV_PROTECTED
5846 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5847 || possible_function_pointer_reloc(r_type
));
5850 // Report an unsupported relocation against a local symbol.
5852 template<int size
, bool big_endian
>
5854 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
5855 Sized_relobj_file
<size
, big_endian
>* object
,
5856 unsigned int r_type
)
5858 gold_error(_("%s: unsupported reloc %u against local symbol"),
5859 object
->name().c_str(), r_type
);
5862 // We are about to emit a dynamic relocation of type R_TYPE. If the
5863 // dynamic linker does not support it, issue an error.
5865 template<int size
, bool big_endian
>
5867 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
5868 unsigned int r_type
)
5870 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
5874 // These are the relocation types supported by glibc for AARCH64.
5875 case elfcpp::R_AARCH64_NONE
:
5876 case elfcpp::R_AARCH64_COPY
:
5877 case elfcpp::R_AARCH64_GLOB_DAT
:
5878 case elfcpp::R_AARCH64_JUMP_SLOT
:
5879 case elfcpp::R_AARCH64_RELATIVE
:
5880 case elfcpp::R_AARCH64_TLS_DTPREL64
:
5881 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
5882 case elfcpp::R_AARCH64_TLS_TPREL64
:
5883 case elfcpp::R_AARCH64_TLSDESC
:
5884 case elfcpp::R_AARCH64_IRELATIVE
:
5885 case elfcpp::R_AARCH64_ABS32
:
5886 case elfcpp::R_AARCH64_ABS64
:
5893 // This prevents us from issuing more than one error per reloc
5894 // section. But we can still wind up issuing more than one
5895 // error per object file.
5896 if (this->issued_non_pic_error_
)
5898 gold_assert(parameters
->options().output_is_position_independent());
5899 object
->error(_("requires unsupported dynamic reloc; "
5900 "recompile with -fPIC"));
5901 this->issued_non_pic_error_
= true;
5905 // Return whether we need to make a PLT entry for a relocation of the
5906 // given type against a STT_GNU_IFUNC symbol.
5908 template<int size
, bool big_endian
>
5910 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
5911 Sized_relobj_file
<size
, big_endian
>* object
,
5912 unsigned int r_type
)
5914 const AArch64_reloc_property
* arp
=
5915 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5916 gold_assert(arp
!= NULL
);
5918 int flags
= arp
->reference_flags();
5919 if (flags
& Symbol::TLS_REF
)
5921 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5922 object
->name().c_str(), arp
->name().c_str());
5928 // Scan a relocation for a local symbol.
5930 template<int size
, bool big_endian
>
5932 Target_aarch64
<size
, big_endian
>::Scan::local(
5933 Symbol_table
* symtab
,
5935 Target_aarch64
<size
, big_endian
>* target
,
5936 Sized_relobj_file
<size
, big_endian
>* object
,
5937 unsigned int data_shndx
,
5938 Output_section
* output_section
,
5939 const elfcpp::Rela
<size
, big_endian
>& rela
,
5940 unsigned int r_type
,
5941 const elfcpp::Sym
<size
, big_endian
>& lsym
,
5947 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
5949 Output_data_got_aarch64
<size
, big_endian
>* got
=
5950 target
->got_section(symtab
, layout
);
5951 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5953 // A local STT_GNU_IFUNC symbol may require a PLT entry.
5954 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
5955 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
5956 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
5960 case elfcpp::R_AARCH64_ABS32
:
5961 case elfcpp::R_AARCH64_ABS16
:
5962 if (parameters
->options().output_is_position_independent())
5964 gold_error(_("%s: unsupported reloc %u in pos independent link."),
5965 object
->name().c_str(), r_type
);
5969 case elfcpp::R_AARCH64_ABS64
:
5970 // If building a shared library or pie, we need to mark this as a dynmic
5971 // reloction, so that the dynamic loader can relocate it.
5972 if (parameters
->options().output_is_position_independent())
5974 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
5975 rela_dyn
->add_local_relative(object
, r_sym
,
5976 elfcpp::R_AARCH64_RELATIVE
,
5979 rela
.get_r_offset(),
5980 rela
.get_r_addend(),
5985 case elfcpp::R_AARCH64_PREL64
:
5986 case elfcpp::R_AARCH64_PREL32
:
5987 case elfcpp::R_AARCH64_PREL16
:
5990 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5991 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5992 // This pair of relocations is used to access a specific GOT entry.
5994 bool is_new
= false;
5995 // This symbol requires a GOT entry.
5997 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
5999 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
6000 if (is_new
&& parameters
->options().output_is_position_independent())
6001 target
->rela_dyn_section(layout
)->
6002 add_local_relative(object
,
6004 elfcpp::R_AARCH64_RELATIVE
,
6006 object
->local_got_offset(r_sym
,
6013 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6014 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6015 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6016 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6017 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6018 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6019 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6020 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6021 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6022 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6025 // Control flow, pc-relative. We don't need to do anything for a relative
6026 // addressing relocation against a local symbol if it does not reference
6028 case elfcpp::R_AARCH64_TSTBR14
:
6029 case elfcpp::R_AARCH64_CONDBR19
:
6030 case elfcpp::R_AARCH64_JUMP26
:
6031 case elfcpp::R_AARCH64_CALL26
:
6034 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6035 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6037 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6038 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6039 if (tlsopt
== tls::TLSOPT_TO_LE
)
6042 layout
->set_has_static_tls();
6043 // Create a GOT entry for the tp-relative offset.
6044 if (!parameters
->doing_static_link())
6046 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
6047 target
->rela_dyn_section(layout
),
6048 elfcpp::R_AARCH64_TLS_TPREL64
);
6050 else if (!object
->local_has_got_offset(r_sym
,
6051 GOT_TYPE_TLS_OFFSET
))
6053 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
6054 unsigned int got_offset
=
6055 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
6056 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6057 gold_assert(addend
== 0);
6058 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
6064 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6065 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6067 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6068 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6069 if (tlsopt
== tls::TLSOPT_TO_LE
)
6071 layout
->set_has_static_tls();
6074 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6076 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
6078 target
->rela_dyn_section(layout
),
6079 elfcpp::R_AARCH64_TLS_DTPMOD64
);
6083 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6084 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6085 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6086 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6087 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6088 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6089 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6090 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6092 layout
->set_has_static_tls();
6093 bool output_is_shared
= parameters
->options().shared();
6094 if (output_is_shared
)
6095 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
6096 object
->name().c_str(), r_type
);
6100 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6101 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6103 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6104 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6105 if (tlsopt
== tls::TLSOPT_NONE
)
6107 // Create a GOT entry for the module index.
6108 target
->got_mod_index_entry(symtab
, layout
, object
);
6110 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6111 unsupported_reloc_local(object
, r_type
);
6115 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6116 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6117 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6118 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6121 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6122 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6123 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6125 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6126 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6127 target
->define_tls_base_symbol(symtab
, layout
);
6128 if (tlsopt
== tls::TLSOPT_NONE
)
6130 // Create reserved PLT and GOT entries for the resolver.
6131 target
->reserve_tlsdesc_entries(symtab
, layout
);
6133 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
6134 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
6135 // entry needs to be in an area in .got.plt, not .got. Call
6136 // got_section to make sure the section has been created.
6137 target
->got_section(symtab
, layout
);
6138 Output_data_got
<size
, big_endian
>* got
=
6139 target
->got_tlsdesc_section();
6140 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6141 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
6143 unsigned int got_offset
= got
->add_constant(0);
6144 got
->add_constant(0);
6145 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
6147 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6148 // We store the arguments we need in a vector, and use
6149 // the index into the vector as the parameter to pass
6150 // to the target specific routines.
6151 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6152 void* arg
= reinterpret_cast<void*>(intarg
);
6153 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6154 got
, got_offset
, 0);
6157 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6158 unsupported_reloc_local(object
, r_type
);
6162 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6166 unsupported_reloc_local(object
, r_type
);
6171 // Report an unsupported relocation against a global symbol.
6173 template<int size
, bool big_endian
>
6175 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6176 Sized_relobj_file
<size
, big_endian
>* object
,
6177 unsigned int r_type
,
6180 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6181 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6184 template<int size
, bool big_endian
>
6186 Target_aarch64
<size
, big_endian
>::Scan::global(
6187 Symbol_table
* symtab
,
6189 Target_aarch64
<size
, big_endian
>* target
,
6190 Sized_relobj_file
<size
, big_endian
> * object
,
6191 unsigned int data_shndx
,
6192 Output_section
* output_section
,
6193 const elfcpp::Rela
<size
, big_endian
>& rela
,
6194 unsigned int r_type
,
6197 // A STT_GNU_IFUNC symbol may require a PLT entry.
6198 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6199 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6200 target
->make_plt_entry(symtab
, layout
, gsym
);
6202 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6204 const AArch64_reloc_property
* arp
=
6205 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6206 gold_assert(arp
!= NULL
);
6210 case elfcpp::R_AARCH64_ABS16
:
6211 case elfcpp::R_AARCH64_ABS32
:
6212 case elfcpp::R_AARCH64_ABS64
:
6214 // Make a PLT entry if necessary.
6215 if (gsym
->needs_plt_entry())
6217 target
->make_plt_entry(symtab
, layout
, gsym
);
6218 // Since this is not a PC-relative relocation, we may be
6219 // taking the address of a function. In that case we need to
6220 // set the entry in the dynamic symbol table to the address of
6222 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6223 gsym
->set_needs_dynsym_value();
6225 // Make a dynamic relocation if necessary.
6226 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6228 if (!parameters
->options().output_is_position_independent()
6229 && gsym
->may_need_copy_reloc())
6231 target
->copy_reloc(symtab
, layout
, object
,
6232 data_shndx
, output_section
, gsym
, rela
);
6234 else if (r_type
== elfcpp::R_AARCH64_ABS64
6235 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6236 && gsym
->can_use_relative_reloc(false)
6237 && !gsym
->is_from_dynobj()
6238 && !gsym
->is_undefined()
6239 && !gsym
->is_preemptible())
6241 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6242 // symbol. This makes a function address in a PIE executable
6243 // match the address in a shared library that it links against.
6244 Reloc_section
* rela_dyn
=
6245 target
->rela_irelative_section(layout
);
6246 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6247 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6248 output_section
, object
,
6250 rela
.get_r_offset(),
6251 rela
.get_r_addend());
6253 else if (r_type
== elfcpp::R_AARCH64_ABS64
6254 && gsym
->can_use_relative_reloc(false))
6256 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6257 rela_dyn
->add_global_relative(gsym
,
6258 elfcpp::R_AARCH64_RELATIVE
,
6262 rela
.get_r_offset(),
6263 rela
.get_r_addend(),
6268 check_non_pic(object
, r_type
);
6269 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6270 rela_dyn
= target
->rela_dyn_section(layout
);
6271 rela_dyn
->add_global(
6272 gsym
, r_type
, output_section
, object
,
6273 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6279 case elfcpp::R_AARCH64_PREL16
:
6280 case elfcpp::R_AARCH64_PREL32
:
6281 case elfcpp::R_AARCH64_PREL64
:
6282 // This is used to fill the GOT absolute address.
6283 if (gsym
->needs_plt_entry())
6285 target
->make_plt_entry(symtab
, layout
, gsym
);
6289 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6290 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6291 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6292 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6293 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6294 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6295 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6296 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6297 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6298 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6300 if (gsym
->needs_plt_entry())
6301 target
->make_plt_entry(symtab
, layout
, gsym
);
6302 // Make a dynamic relocation if necessary.
6303 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6305 if (parameters
->options().output_is_executable()
6306 && gsym
->may_need_copy_reloc())
6308 target
->copy_reloc(symtab
, layout
, object
,
6309 data_shndx
, output_section
, gsym
, rela
);
6315 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6316 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6318 // This pair of relocations is used to access a specific GOT entry.
6319 // Note a GOT entry is an *address* to a symbol.
6320 // The symbol requires a GOT entry
6321 Output_data_got_aarch64
<size
, big_endian
>* got
=
6322 target
->got_section(symtab
, layout
);
6323 if (gsym
->final_value_is_known())
6325 // For a STT_GNU_IFUNC symbol we want the PLT address.
6326 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6327 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6329 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6333 // If this symbol is not fully resolved, we need to add a dynamic
6334 // relocation for it.
6335 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6337 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6339 // 1) The symbol may be defined in some other module.
6340 // 2) We are building a shared library and this is a protected
6341 // symbol; using GLOB_DAT means that the dynamic linker can use
6342 // the address of the PLT in the main executable when appropriate
6343 // so that function address comparisons work.
6344 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6345 // again so that function address comparisons work.
6346 if (gsym
->is_from_dynobj()
6347 || gsym
->is_undefined()
6348 || gsym
->is_preemptible()
6349 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6350 && parameters
->options().shared())
6351 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6352 && parameters
->options().output_is_position_independent()))
6353 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6354 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6357 // For a STT_GNU_IFUNC symbol we want to write the PLT
6358 // offset into the GOT, so that function pointer
6359 // comparisons work correctly.
6361 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6362 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6365 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6366 // Tell the dynamic linker to use the PLT address
6367 // when resolving relocations.
6368 if (gsym
->is_from_dynobj()
6369 && !parameters
->options().shared())
6370 gsym
->set_needs_dynsym_value();
6374 rela_dyn
->add_global_relative(
6375 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6377 gsym
->got_offset(GOT_TYPE_STANDARD
),
6386 case elfcpp::R_AARCH64_TSTBR14
:
6387 case elfcpp::R_AARCH64_CONDBR19
:
6388 case elfcpp::R_AARCH64_JUMP26
:
6389 case elfcpp::R_AARCH64_CALL26
:
6391 if (gsym
->final_value_is_known())
6394 if (gsym
->is_defined() &&
6395 !gsym
->is_from_dynobj() &&
6396 !gsym
->is_preemptible())
6399 // Make plt entry for function call.
6400 target
->make_plt_entry(symtab
, layout
, gsym
);
6404 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6405 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6407 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6408 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6409 if (tlsopt
== tls::TLSOPT_TO_LE
)
6411 layout
->set_has_static_tls();
6414 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6417 Output_data_got_aarch64
<size
, big_endian
>* got
=
6418 target
->got_section(symtab
, layout
);
6419 // Create 2 consecutive entries for module index and offset.
6420 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6421 target
->rela_dyn_section(layout
),
6422 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6423 elfcpp::R_AARCH64_TLS_DTPREL64
);
6427 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6428 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6430 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6431 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6432 if (tlsopt
== tls::TLSOPT_NONE
)
6434 // Create a GOT entry for the module index.
6435 target
->got_mod_index_entry(symtab
, layout
, object
);
6437 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6438 unsupported_reloc_local(object
, r_type
);
6442 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6443 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6444 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6445 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6448 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6449 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6451 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6452 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6453 if (tlsopt
== tls::TLSOPT_TO_LE
)
6456 layout
->set_has_static_tls();
6457 // Create a GOT entry for the tp-relative offset.
6458 Output_data_got_aarch64
<size
, big_endian
>* got
6459 = target
->got_section(symtab
, layout
);
6460 if (!parameters
->doing_static_link())
6462 got
->add_global_with_rel(
6463 gsym
, GOT_TYPE_TLS_OFFSET
,
6464 target
->rela_dyn_section(layout
),
6465 elfcpp::R_AARCH64_TLS_TPREL64
);
6467 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6469 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6470 unsigned int got_offset
=
6471 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6472 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6473 gold_assert(addend
== 0);
6474 got
->add_static_reloc(got_offset
,
6475 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6480 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6481 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6482 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6483 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6484 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6485 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6486 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6487 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6488 layout
->set_has_static_tls();
6489 if (parameters
->options().shared())
6490 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6491 object
->name().c_str(), r_type
);
6494 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6495 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6496 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6498 target
->define_tls_base_symbol(symtab
, layout
);
6499 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6500 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6501 if (tlsopt
== tls::TLSOPT_NONE
)
6503 // Create reserved PLT and GOT entries for the resolver.
6504 target
->reserve_tlsdesc_entries(symtab
, layout
);
6506 // Create a double GOT entry with an R_AARCH64_TLSDESC
6507 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6508 // entry needs to be in an area in .got.plt, not .got. Call
6509 // got_section to make sure the section has been created.
6510 target
->got_section(symtab
, layout
);
6511 Output_data_got
<size
, big_endian
>* got
=
6512 target
->got_tlsdesc_section();
6513 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6514 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6515 elfcpp::R_AARCH64_TLSDESC
, 0);
6517 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6519 // Create a GOT entry for the tp-relative offset.
6520 Output_data_got
<size
, big_endian
>* got
6521 = target
->got_section(symtab
, layout
);
6522 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6523 target
->rela_dyn_section(layout
),
6524 elfcpp::R_AARCH64_TLS_TPREL64
);
6526 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6527 unsupported_reloc_global(object
, r_type
, gsym
);
6531 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6535 gold_error(_("%s: unsupported reloc type in global scan"),
6536 aarch64_reloc_property_table
->
6537 reloc_name_in_error_message(r_type
).c_str());
6540 } // End of Scan::global
6543 // Create the PLT section.
6544 template<int size
, bool big_endian
>
6546 Target_aarch64
<size
, big_endian
>::make_plt_section(
6547 Symbol_table
* symtab
, Layout
* layout
)
6549 if (this->plt_
== NULL
)
6551 // Create the GOT section first.
6552 this->got_section(symtab
, layout
);
6554 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6555 this->got_irelative_
);
6557 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6559 | elfcpp::SHF_EXECINSTR
),
6560 this->plt_
, ORDER_PLT
, false);
6562 // Make the sh_info field of .rela.plt point to .plt.
6563 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6564 rela_plt_os
->set_info_section(this->plt_
->output_section());
6568 // Return the section for TLSDESC relocations.
6570 template<int size
, bool big_endian
>
6571 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6572 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6574 return this->plt_section()->rela_tlsdesc(layout
);
6577 // Create a PLT entry for a global symbol.
6579 template<int size
, bool big_endian
>
6581 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6582 Symbol_table
* symtab
,
6586 if (gsym
->has_plt_offset())
6589 if (this->plt_
== NULL
)
6590 this->make_plt_section(symtab
, layout
);
6592 this->plt_
->add_entry(symtab
, layout
, gsym
);
6595 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6597 template<int size
, bool big_endian
>
6599 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6600 Symbol_table
* symtab
, Layout
* layout
,
6601 Sized_relobj_file
<size
, big_endian
>* relobj
,
6602 unsigned int local_sym_index
)
6604 if (relobj
->local_has_plt_offset(local_sym_index
))
6606 if (this->plt_
== NULL
)
6607 this->make_plt_section(symtab
, layout
);
6608 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6611 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6614 template<int size
, bool big_endian
>
6616 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6617 Symbol_table
* symtab
,
6619 Sized_relobj_file
<size
, big_endian
>* object
,
6620 unsigned int data_shndx
,
6621 unsigned int sh_type
,
6622 const unsigned char* prelocs
,
6624 Output_section
* output_section
,
6625 bool needs_special_offset_handling
,
6626 size_t local_symbol_count
,
6627 const unsigned char* plocal_symbols
)
6629 if (sh_type
== elfcpp::SHT_REL
)
6634 gold::gc_process_relocs
<
6636 Target_aarch64
<size
, big_endian
>,
6638 typename Target_aarch64
<size
, big_endian
>::Scan
,
6639 typename Target_aarch64
<size
, big_endian
>::Relocatable_size_for_reloc
>(
6648 needs_special_offset_handling
,
6653 // Scan relocations for a section.
6655 template<int size
, bool big_endian
>
6657 Target_aarch64
<size
, big_endian
>::scan_relocs(
6658 Symbol_table
* symtab
,
6660 Sized_relobj_file
<size
, big_endian
>* object
,
6661 unsigned int data_shndx
,
6662 unsigned int sh_type
,
6663 const unsigned char* prelocs
,
6665 Output_section
* output_section
,
6666 bool needs_special_offset_handling
,
6667 size_t local_symbol_count
,
6668 const unsigned char* plocal_symbols
)
6670 if (sh_type
== elfcpp::SHT_REL
)
6672 gold_error(_("%s: unsupported REL reloc section"),
6673 object
->name().c_str());
6676 gold::scan_relocs
<size
, big_endian
, Target_aarch64
, elfcpp::SHT_RELA
, Scan
>(
6685 needs_special_offset_handling
,
6690 // Return the value to use for a dynamic which requires special
6691 // treatment. This is how we support equality comparisons of function
6692 // pointers across shared library boundaries, as described in the
6693 // processor specific ABI supplement.
6695 template<int size
, bool big_endian
>
6697 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6699 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6700 return this->plt_address_for_global(gsym
);
6704 // Finalize the sections.
6706 template<int size
, bool big_endian
>
6708 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6710 const Input_objects
*,
6711 Symbol_table
* symtab
)
6713 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6715 : this->plt_
->rela_plt());
6716 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6717 this->rela_dyn_
, true, false);
6719 // Emit any relocs we saved in an attempt to avoid generating COPY
6721 if (this->copy_relocs_
.any_saved_relocs())
6722 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6724 // Fill in some more dynamic tags.
6725 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6728 if (this->plt_
!= NULL
6729 && this->plt_
->output_section() != NULL
6730 && this->plt_
->has_tlsdesc_entry())
6732 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6733 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6734 this->got_
->finalize_data_size();
6735 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6736 this->plt_
, plt_offset
);
6737 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6738 this->got_
, got_offset
);
6742 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6743 // the .got.plt section.
6744 Symbol
* sym
= this->global_offset_table_
;
6747 uint64_t data_size
= this->got_plt_
->current_data_size();
6748 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6750 // If the .got section is more than 0x8000 bytes, we add
6751 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6752 // bit relocations have a greater chance of working.
6753 if (data_size
>= 0x8000)
6754 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6755 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6758 if (parameters
->doing_static_link()
6759 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6761 // If linking statically, make sure that the __rela_iplt symbols
6762 // were defined if necessary, even if we didn't create a PLT.
6763 static const Define_symbol_in_segment syms
[] =
6766 "__rela_iplt_start", // name
6767 elfcpp::PT_LOAD
, // segment_type
6768 elfcpp::PF_W
, // segment_flags_set
6769 elfcpp::PF(0), // segment_flags_clear
6772 elfcpp::STT_NOTYPE
, // type
6773 elfcpp::STB_GLOBAL
, // binding
6774 elfcpp::STV_HIDDEN
, // visibility
6776 Symbol::SEGMENT_START
, // offset_from_base
6780 "__rela_iplt_end", // name
6781 elfcpp::PT_LOAD
, // segment_type
6782 elfcpp::PF_W
, // segment_flags_set
6783 elfcpp::PF(0), // segment_flags_clear
6786 elfcpp::STT_NOTYPE
, // type
6787 elfcpp::STB_GLOBAL
, // binding
6788 elfcpp::STV_HIDDEN
, // visibility
6790 Symbol::SEGMENT_START
, // offset_from_base
6795 symtab
->define_symbols(layout
, 2, syms
,
6796 layout
->script_options()->saw_sections_clause());
6802 // Perform a relocation.
6804 template<int size
, bool big_endian
>
6806 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
6807 const Relocate_info
<size
, big_endian
>* relinfo
,
6808 Target_aarch64
<size
, big_endian
>* target
,
6811 const elfcpp::Rela
<size
, big_endian
>& rela
,
6812 unsigned int r_type
,
6813 const Sized_symbol
<size
>* gsym
,
6814 const Symbol_value
<size
>* psymval
,
6815 unsigned char* view
,
6816 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
6817 section_size_type
/* view_size */)
6822 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
6824 const AArch64_reloc_property
* reloc_property
=
6825 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6827 if (reloc_property
== NULL
)
6829 std::string reloc_name
=
6830 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
6831 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6832 _("cannot relocate %s in object file"),
6833 reloc_name
.c_str());
6837 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6839 // Pick the value to use for symbols defined in the PLT.
6840 Symbol_value
<size
> symval
;
6842 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
6844 symval
.set_output_value(target
->plt_address_for_global(gsym
));
6847 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
6849 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6850 if (object
->local_has_plt_offset(r_sym
))
6852 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
6857 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6859 // Get the GOT offset if needed.
6860 // For aarch64, the GOT pointer points to the start of the GOT section.
6861 bool have_got_offset
= false;
6863 int got_base
= (target
->got_
!= NULL
6864 ? (target
->got_
->current_data_size() >= 0x8000
6869 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
6870 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
6871 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
6872 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
6873 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
6874 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
6875 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
6876 case elfcpp::R_AARCH64_GOTREL64
:
6877 case elfcpp::R_AARCH64_GOTREL32
:
6878 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
6879 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
6880 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6881 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6882 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6885 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
6886 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
6890 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6891 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
6892 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
6895 have_got_offset
= true;
6902 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
6903 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
6906 case elfcpp::R_AARCH64_NONE
:
6909 case elfcpp::R_AARCH64_ABS64
:
6910 reloc_status
= Reloc::template rela_ua
<64>(
6911 view
, object
, psymval
, addend
, reloc_property
);
6914 case elfcpp::R_AARCH64_ABS32
:
6915 reloc_status
= Reloc::template rela_ua
<32>(
6916 view
, object
, psymval
, addend
, reloc_property
);
6919 case elfcpp::R_AARCH64_ABS16
:
6920 reloc_status
= Reloc::template rela_ua
<16>(
6921 view
, object
, psymval
, addend
, reloc_property
);
6924 case elfcpp::R_AARCH64_PREL64
:
6925 reloc_status
= Reloc::template pcrela_ua
<64>(
6926 view
, object
, psymval
, addend
, address
, reloc_property
);
6929 case elfcpp::R_AARCH64_PREL32
:
6930 reloc_status
= Reloc::template pcrela_ua
<32>(
6931 view
, object
, psymval
, addend
, address
, reloc_property
);
6934 case elfcpp::R_AARCH64_PREL16
:
6935 reloc_status
= Reloc::template pcrela_ua
<16>(
6936 view
, object
, psymval
, addend
, address
, reloc_property
);
6939 case elfcpp::R_AARCH64_LD_PREL_LO19
:
6940 reloc_status
= Reloc::template pcrela_general
<32>(
6941 view
, object
, psymval
, addend
, address
, reloc_property
);
6944 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
6945 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
6946 address
, reloc_property
);
6949 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
6950 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
6951 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
6955 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
6956 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
6957 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
6958 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
6959 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
6960 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
6961 reloc_status
= Reloc::template rela_general
<32>(
6962 view
, object
, psymval
, addend
, reloc_property
);
6965 case elfcpp::R_AARCH64_CALL26
:
6966 if (this->skip_call_tls_get_addr_
)
6968 // Double check that the TLSGD insn has been optimized away.
6969 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
6970 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
6971 reinterpret_cast<Insntype
*>(view
));
6972 gold_assert((insn
& 0xff000000) == 0x91000000);
6974 reloc_status
= Reloc::STATUS_OKAY
;
6975 this->skip_call_tls_get_addr_
= false;
6976 // Return false to stop further processing this reloc.
6980 case elfcpp::R_AARCH64_JUMP26
:
6981 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
6982 gsym
, psymval
, object
,
6983 target
->stub_group_size_
))
6986 case elfcpp::R_AARCH64_TSTBR14
:
6987 case elfcpp::R_AARCH64_CONDBR19
:
6988 reloc_status
= Reloc::template pcrela_general
<32>(
6989 view
, object
, psymval
, addend
, address
, reloc_property
);
6992 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6993 gold_assert(have_got_offset
);
6994 value
= target
->got_
->address() + got_base
+ got_offset
;
6995 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
6998 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6999 gold_assert(have_got_offset
);
7000 value
= target
->got_
->address() + got_base
+ got_offset
;
7001 reloc_status
= Reloc::template rela_general
<32>(
7002 view
, value
, addend
, reloc_property
);
7005 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7006 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7007 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7008 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7009 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7010 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7011 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7012 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7013 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7014 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7015 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7016 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7017 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7018 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7019 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7020 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7021 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7022 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7023 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7024 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7025 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7026 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7027 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
7028 gsym
, psymval
, view
, address
);
7031 // These are dynamic relocations, which are unexpected when linking.
7032 case elfcpp::R_AARCH64_COPY
:
7033 case elfcpp::R_AARCH64_GLOB_DAT
:
7034 case elfcpp::R_AARCH64_JUMP_SLOT
:
7035 case elfcpp::R_AARCH64_RELATIVE
:
7036 case elfcpp::R_AARCH64_IRELATIVE
:
7037 case elfcpp::R_AARCH64_TLS_DTPREL64
:
7038 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
7039 case elfcpp::R_AARCH64_TLS_TPREL64
:
7040 case elfcpp::R_AARCH64_TLSDESC
:
7041 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7042 _("unexpected reloc %u in object file"),
7047 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7048 _("unsupported reloc %s"),
7049 reloc_property
->name().c_str());
7053 // Report any errors.
7054 switch (reloc_status
)
7056 case Reloc::STATUS_OKAY
:
7058 case Reloc::STATUS_OVERFLOW
:
7059 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7060 _("relocation overflow in %s"),
7061 reloc_property
->name().c_str());
7063 case Reloc::STATUS_BAD_RELOC
:
7064 gold_error_at_location(
7067 rela
.get_r_offset(),
7068 _("unexpected opcode while processing relocation %s"),
7069 reloc_property
->name().c_str());
7079 template<int size
, bool big_endian
>
7081 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7082 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
7083 const Relocate_info
<size
, big_endian
>* relinfo
,
7084 Target_aarch64
<size
, big_endian
>* target
,
7086 const elfcpp::Rela
<size
, big_endian
>& rela
,
7087 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
7088 const Symbol_value
<size
>* psymval
,
7089 unsigned char* view
,
7090 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7092 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7093 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7095 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7096 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7097 const AArch64_reloc_property
* reloc_property
=
7098 aarch64_reloc_property_table
->get_reloc_property(r_type
);
7099 gold_assert(reloc_property
!= NULL
);
7101 const bool is_final
= (gsym
== NULL
7102 ? !parameters
->options().shared()
7103 : gsym
->final_value_is_known());
7104 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
7105 optimize_tls_reloc(is_final
, r_type
);
7107 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
7108 int tls_got_offset_type
;
7111 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7112 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
7114 if (tlsopt
== tls::TLSOPT_TO_LE
)
7116 if (tls_segment
== NULL
)
7118 gold_assert(parameters
->errors()->error_count() > 0
7119 || issue_undefined_symbol_error(gsym
));
7120 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7122 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
7125 else if (tlsopt
== tls::TLSOPT_NONE
)
7127 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
7128 // Firstly get the address for the got entry.
7129 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7132 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7133 got_entry_address
= target
->got_
->address() +
7134 gsym
->got_offset(tls_got_offset_type
);
7138 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7140 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7141 got_entry_address
= target
->got_
->address() +
7142 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7145 // Relocate the address into adrp/ld, adrp/add pair.
7148 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
7149 return aarch64_reloc_funcs::adrp(
7150 view
, got_entry_address
+ addend
, address
);
7154 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7155 return aarch64_reloc_funcs::template rela_general
<32>(
7156 view
, got_entry_address
, addend
, reloc_property
);
7163 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7164 _("unsupported gd_to_ie relaxation on %u"),
7169 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7170 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7172 if (tlsopt
== tls::TLSOPT_TO_LE
)
7174 if (tls_segment
== NULL
)
7176 gold_assert(parameters
->errors()->error_count() > 0
7177 || issue_undefined_symbol_error(gsym
));
7178 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7180 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7184 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7185 // Relocate the field with the offset of the GOT entry for
7186 // the module index.
7187 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7188 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7189 target
->got_
->address());
7193 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7194 return aarch64_reloc_funcs::adrp(
7195 view
, got_entry_address
+ addend
, address
);
7198 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7199 return aarch64_reloc_funcs::template rela_general
<32>(
7200 view
, got_entry_address
, addend
, reloc_property
);
7209 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7210 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7211 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7212 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7214 AArch64_address value
= psymval
->value(object
, 0);
7215 if (tlsopt
== tls::TLSOPT_TO_LE
)
7217 if (tls_segment
== NULL
)
7219 gold_assert(parameters
->errors()->error_count() > 0
7220 || issue_undefined_symbol_error(gsym
));
7221 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7226 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7227 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7231 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7232 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7233 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7234 return aarch64_reloc_funcs::template rela_general
<32>(
7235 view
, value
, addend
, reloc_property
);
7241 // We should never reach here.
7245 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7246 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7248 if (tlsopt
== tls::TLSOPT_TO_LE
)
7250 if (tls_segment
== NULL
)
7252 gold_assert(parameters
->errors()->error_count() > 0
7253 || issue_undefined_symbol_error(gsym
));
7254 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7256 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7259 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7261 // Firstly get the address for the got entry.
7262 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7265 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7266 got_entry_address
= target
->got_
->address() +
7267 gsym
->got_offset(tls_got_offset_type
);
7271 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7273 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7274 got_entry_address
= target
->got_
->address() +
7275 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7277 // Relocate the address into adrp/ld, adrp/add pair.
7280 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7281 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7284 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7285 return aarch64_reloc_funcs::template rela_general
<32>(
7286 view
, got_entry_address
, addend
, reloc_property
);
7291 // We shall never reach here.
7294 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7295 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7296 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7297 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7298 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7299 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7300 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7301 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7303 gold_assert(tls_segment
!= NULL
);
7304 AArch64_address value
= psymval
->value(object
, 0);
7306 if (!parameters
->options().shared())
7308 AArch64_address aligned_tcb_size
=
7309 align_address(target
->tcb_size(),
7310 tls_segment
->maximum_alignment());
7311 value
+= aligned_tcb_size
;
7314 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7315 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7316 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7317 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7320 return aarch64_reloc_funcs::template
7321 rela_general
<32>(view
,
7328 gold_error(_("%s: unsupported reloc %u "
7329 "in non-static TLSLE mode."),
7330 object
->name().c_str(), r_type
);
7334 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7335 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7336 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7337 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7339 if (tlsopt
== tls::TLSOPT_TO_LE
)
7341 if (tls_segment
== NULL
)
7343 gold_assert(parameters
->errors()->error_count() > 0
7344 || issue_undefined_symbol_error(gsym
));
7345 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7347 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7352 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7353 ? GOT_TYPE_TLS_OFFSET
7354 : GOT_TYPE_TLS_DESC
);
7355 unsigned int got_tlsdesc_offset
= 0;
7356 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7357 && tlsopt
== tls::TLSOPT_NONE
)
7359 // We created GOT entries in the .got.tlsdesc portion of the
7360 // .got.plt section, but the offset stored in the symbol is the
7361 // offset within .got.tlsdesc.
7362 got_tlsdesc_offset
= (target
->got_
->data_size()
7363 + target
->got_plt_section()->data_size());
7365 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7368 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7369 got_entry_address
= target
->got_
->address()
7370 + got_tlsdesc_offset
7371 + gsym
->got_offset(tls_got_offset_type
);
7375 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7377 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7378 got_entry_address
= target
->got_
->address() +
7379 got_tlsdesc_offset
+
7380 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7382 if (tlsopt
== tls::TLSOPT_TO_IE
)
7384 if (tls_segment
== NULL
)
7386 gold_assert(parameters
->errors()->error_count() > 0
7387 || issue_undefined_symbol_error(gsym
));
7388 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7390 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7391 view
, psymval
, got_entry_address
,
7395 // Now do tlsdesc relocation.
7398 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7399 return aarch64_reloc_funcs::adrp(view
,
7400 got_entry_address
+ addend
,
7403 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7404 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7405 return aarch64_reloc_funcs::template rela_general
<32>(
7406 view
, got_entry_address
, addend
, reloc_property
);
7408 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7409 return aarch64_reloc_funcs::STATUS_OKAY
;
7419 gold_error(_("%s: unsupported TLS reloc %u."),
7420 object
->name().c_str(), r_type
);
7422 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7423 } // End of relocate_tls.
7426 template<int size
, bool big_endian
>
7428 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7429 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7430 const Relocate_info
<size
, big_endian
>* relinfo
,
7431 Target_aarch64
<size
, big_endian
>* target
,
7432 const elfcpp::Rela
<size
, big_endian
>& rela
,
7433 unsigned int r_type
,
7434 unsigned char* view
,
7435 const Symbol_value
<size
>* psymval
)
7437 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7438 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7439 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7441 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7442 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7443 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7444 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7446 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7448 // This is the 2nd relocs, optimization should already have been
7450 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7451 return aarch64_reloc_funcs::STATUS_OKAY
;
7454 // The original sequence is -
7455 // 90000000 adrp x0, 0 <main>
7456 // 91000000 add x0, x0, #0x0
7457 // 94000000 bl 0 <__tls_get_addr>
7458 // optimized to sequence -
7459 // d53bd040 mrs x0, tpidr_el0
7460 // 91400000 add x0, x0, #0x0, lsl #12
7461 // 91000000 add x0, x0, #0x0
7463 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7464 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7465 // have to change "bl tls_get_addr", which does not have a corresponding tls
7466 // relocation type. So before proceeding, we need to make sure compiler
7467 // does not change the sequence.
7468 if(!(insn1
== 0x90000000 // adrp x0,0
7469 && insn2
== 0x91000000 // add x0, x0, #0x0
7470 && insn3
== 0x94000000)) // bl 0
7472 // Ideally we should give up gd_to_le relaxation and do gd access.
7473 // However the gd_to_le relaxation decision has been made early
7474 // in the scan stage, where we did not allocate any GOT entry for
7475 // this symbol. Therefore we have to exit and report error now.
7476 gold_error(_("unexpected reloc insn sequence while relaxing "
7477 "tls gd to le for reloc %u."), r_type
);
7478 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7482 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7483 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7484 insn3
= 0x91000000; // add x0, x0, #0x0
7485 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7486 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7487 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7489 // Calculate tprel value.
7490 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7491 gold_assert(tls_segment
!= NULL
);
7492 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7493 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7494 AArch64_address aligned_tcb_size
=
7495 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7496 AArch64_address x
= value
+ aligned_tcb_size
;
7498 // After new insns are written, apply TLSLE relocs.
7499 const AArch64_reloc_property
* rp1
=
7500 aarch64_reloc_property_table
->get_reloc_property(
7501 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7502 const AArch64_reloc_property
* rp2
=
7503 aarch64_reloc_property_table
->get_reloc_property(
7504 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7505 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7507 typename
aarch64_reloc_funcs::Status s1
=
7508 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7512 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7515 typename
aarch64_reloc_funcs::Status s2
=
7516 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7521 this->skip_call_tls_get_addr_
= true;
7523 } // End of tls_gd_to_le
7526 template<int size
, bool big_endian
>
7528 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7529 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7530 const Relocate_info
<size
, big_endian
>* relinfo
,
7531 Target_aarch64
<size
, big_endian
>* target
,
7532 const elfcpp::Rela
<size
, big_endian
>& rela
,
7533 unsigned int r_type
,
7534 unsigned char* view
,
7535 const Symbol_value
<size
>* psymval
)
7537 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7538 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7539 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7541 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7542 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7543 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7544 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7546 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7548 // This is the 2nd relocs, optimization should already have been
7550 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7551 return aarch64_reloc_funcs::STATUS_OKAY
;
7554 // The original sequence is -
7555 // 90000000 adrp x0, 0 <main>
7556 // 91000000 add x0, x0, #0x0
7557 // 94000000 bl 0 <__tls_get_addr>
7558 // optimized to sequence -
7559 // d53bd040 mrs x0, tpidr_el0
7560 // 91400000 add x0, x0, #0x0, lsl #12
7561 // 91000000 add x0, x0, #0x0
7563 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7564 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7565 // have to change "bl tls_get_addr", which does not have a corresponding tls
7566 // relocation type. So before proceeding, we need to make sure compiler
7567 // does not change the sequence.
7568 if(!(insn1
== 0x90000000 // adrp x0,0
7569 && insn2
== 0x91000000 // add x0, x0, #0x0
7570 && insn3
== 0x94000000)) // bl 0
7572 // Ideally we should give up gd_to_le relaxation and do gd access.
7573 // However the gd_to_le relaxation decision has been made early
7574 // in the scan stage, where we did not allocate any GOT entry for
7575 // this symbol. Therefore we have to exit and report error now.
7576 gold_error(_("unexpected reloc insn sequence while relaxing "
7577 "tls gd to le for reloc %u."), r_type
);
7578 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7582 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7583 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7584 insn3
= 0x91000000; // add x0, x0, #0x0
7585 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7586 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7587 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7589 // Calculate tprel value.
7590 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7591 gold_assert(tls_segment
!= NULL
);
7592 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7593 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7594 AArch64_address aligned_tcb_size
=
7595 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7596 AArch64_address x
= value
+ aligned_tcb_size
;
7598 // After new insns are written, apply TLSLE relocs.
7599 const AArch64_reloc_property
* rp1
=
7600 aarch64_reloc_property_table
->get_reloc_property(
7601 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7602 const AArch64_reloc_property
* rp2
=
7603 aarch64_reloc_property_table
->get_reloc_property(
7604 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7605 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7607 typename
aarch64_reloc_funcs::Status s1
=
7608 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7612 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7615 typename
aarch64_reloc_funcs::Status s2
=
7616 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7621 this->skip_call_tls_get_addr_
= true;
7624 } // End of tls_ld_to_le
7626 template<int size
, bool big_endian
>
7628 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7629 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7630 const Relocate_info
<size
, big_endian
>* relinfo
,
7631 Target_aarch64
<size
, big_endian
>* target
,
7632 const elfcpp::Rela
<size
, big_endian
>& rela
,
7633 unsigned int r_type
,
7634 unsigned char* view
,
7635 const Symbol_value
<size
>* psymval
)
7637 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7638 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7639 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7641 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7642 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7643 AArch64_address aligned_tcb_address
=
7644 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7645 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7646 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7647 // "x" is the offset to tp, we can only do this if x is within
7648 // range [0, 2^32-1]
7649 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7651 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7653 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7656 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7657 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7660 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7663 regno
= (insn
& 0x1f);
7664 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7666 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7669 regno
= (insn
& 0x1f);
7670 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7671 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7676 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7677 return aarch64_reloc_funcs::STATUS_OKAY
;
7678 } // End of tls_ie_to_le
7681 template<int size
, bool big_endian
>
7683 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7684 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7685 const Relocate_info
<size
, big_endian
>* relinfo
,
7686 Target_aarch64
<size
, big_endian
>* target
,
7687 const elfcpp::Rela
<size
, big_endian
>& rela
,
7688 unsigned int r_type
,
7689 unsigned char* view
,
7690 const Symbol_value
<size
>* psymval
)
7692 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7693 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7694 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7696 // TLSDESC-GD sequence is like:
7697 // adrp x0, :tlsdesc:v1
7698 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7699 // add x0, x0, :tlsdesc_lo12:v1
7702 // After desc_gd_to_le optimization, the sequence will be like:
7703 // movz x0, #0x0, lsl #16
7708 // Calculate tprel value.
7709 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7710 gold_assert(tls_segment
!= NULL
);
7711 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7712 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7713 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7714 AArch64_address aligned_tcb_size
=
7715 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7716 AArch64_address x
= value
+ aligned_tcb_size
;
7717 // x is the offset to tp, we can only do this if x is within range
7718 // [0, 2^32-1]. If x is out of range, fail and exit.
7719 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7721 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7722 "We Can't do gd_to_le relaxation.\n"), r_type
);
7723 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7728 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7729 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7731 newinsn
= 0xd503201f;
7734 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7736 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7739 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7741 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7745 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7749 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7750 return aarch64_reloc_funcs::STATUS_OKAY
;
7751 } // End of tls_desc_gd_to_le
7754 template<int size
, bool big_endian
>
7756 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7757 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
7758 const Relocate_info
<size
, big_endian
>* /* relinfo */,
7759 Target_aarch64
<size
, big_endian
>* /* target */,
7760 const elfcpp::Rela
<size
, big_endian
>& rela
,
7761 unsigned int r_type
,
7762 unsigned char* view
,
7763 const Symbol_value
<size
>* /* psymval */,
7764 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
7765 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7767 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7768 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7770 // TLSDESC-GD sequence is like:
7771 // adrp x0, :tlsdesc:v1
7772 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7773 // add x0, x0, :tlsdesc_lo12:v1
7776 // After desc_gd_to_ie optimization, the sequence will be like:
7777 // adrp x0, :tlsie:v1
7778 // ldr x0, [x0, :tlsie_lo12:v1]
7782 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7783 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7787 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7788 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7790 newinsn
= 0xd503201f;
7791 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7794 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7796 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7801 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7803 // Set ldr target register to be x0.
7804 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7806 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
7808 const AArch64_reloc_property
* reloc_property
=
7809 aarch64_reloc_property_table
->get_reloc_property(
7810 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
7811 return aarch64_reloc_funcs::template rela_general
<32>(
7812 view
, got_entry_address
, addend
, reloc_property
);
7817 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7821 return aarch64_reloc_funcs::STATUS_OKAY
;
7822 } // End of tls_desc_gd_to_ie
7824 // Relocate section data.
7826 template<int size
, bool big_endian
>
7828 Target_aarch64
<size
, big_endian
>::relocate_section(
7829 const Relocate_info
<size
, big_endian
>* relinfo
,
7830 unsigned int sh_type
,
7831 const unsigned char* prelocs
,
7833 Output_section
* output_section
,
7834 bool needs_special_offset_handling
,
7835 unsigned char* view
,
7836 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
7837 section_size_type view_size
,
7838 const Reloc_symbol_changes
* reloc_symbol_changes
)
7840 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7841 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
7842 gold::relocate_section
<size
, big_endian
, Target_aarch64
, elfcpp::SHT_RELA
,
7843 AArch64_relocate
, gold::Default_comdat_behavior
>(
7849 needs_special_offset_handling
,
7853 reloc_symbol_changes
);
7856 // Return the size of a relocation while scanning during a relocatable
7859 template<int size
, bool big_endian
>
7861 Target_aarch64
<size
, big_endian
>::Relocatable_size_for_reloc::
7866 // We will never support SHT_REL relocations.
7871 // Scan the relocs during a relocatable link.
7873 template<int size
, bool big_endian
>
7875 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
7876 Symbol_table
* symtab
,
7878 Sized_relobj_file
<size
, big_endian
>* object
,
7879 unsigned int data_shndx
,
7880 unsigned int sh_type
,
7881 const unsigned char* prelocs
,
7883 Output_section
* output_section
,
7884 bool needs_special_offset_handling
,
7885 size_t local_symbol_count
,
7886 const unsigned char* plocal_symbols
,
7887 Relocatable_relocs
* rr
)
7889 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7891 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
7892 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
7894 gold::scan_relocatable_relocs
<size
, big_endian
, elfcpp::SHT_RELA
,
7895 Scan_relocatable_relocs
>(
7903 needs_special_offset_handling
,
7909 // Relocate a section during a relocatable link.
7911 template<int size
, bool big_endian
>
7913 Target_aarch64
<size
, big_endian
>::relocate_relocs(
7914 const Relocate_info
<size
, big_endian
>* relinfo
,
7915 unsigned int sh_type
,
7916 const unsigned char* prelocs
,
7918 Output_section
* output_section
,
7919 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
7920 const Relocatable_relocs
* rr
,
7921 unsigned char* view
,
7922 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
7923 section_size_type view_size
,
7924 unsigned char* reloc_view
,
7925 section_size_type reloc_view_size
)
7927 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7929 gold::relocate_relocs
<size
, big_endian
, elfcpp::SHT_RELA
>(
7934 offset_in_output_section
,
7944 // Return whether this is a 3-insn erratum sequence.
7946 template<int size
, bool big_endian
>
7948 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
7949 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
7950 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
7951 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
7956 // The 2nd insn is a single register load or store; or register pair
7958 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
7959 && (!pair
|| (pair
&& !load
)))
7961 // The 3rd insn is a load or store instruction from the "Load/store
7962 // register (unsigned immediate)" encoding class, using Rn as the
7963 // base address register.
7964 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
7965 && (Insn_utilities::aarch64_rn(insn3
)
7966 == Insn_utilities::aarch64_rd(insn1
)))
7973 // Return whether this is a 835769 sequence.
7974 // (Similarly implemented as in elfnn-aarch64.c.)
7976 template<int size
, bool big_endian
>
7978 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
7979 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
7980 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
7990 if (Insn_utilities::aarch64_mlxl(insn2
)
7991 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
7993 /* Any SIMD memory op is independent of the subsequent MLA
7994 by definition of the erratum. */
7995 if (Insn_utilities::aarch64_bit(insn1
, 26))
7998 /* If not SIMD, check for integer memory ops and MLA relationship. */
7999 rn
= Insn_utilities::aarch64_rn(insn2
);
8000 ra
= Insn_utilities::aarch64_ra(insn2
);
8001 rm
= Insn_utilities::aarch64_rm(insn2
);
8003 /* If this is a load and there's a true(RAW) dependency, we are safe
8004 and this is not an erratum sequence. */
8006 (rt
== rn
|| rt
== rm
|| rt
== ra
8007 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
8010 /* We conservatively put out stubs for all other cases (including
8019 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
8021 template<int size
, bool big_endian
>
8023 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
8024 AArch64_relobj
<size
, big_endian
>* relobj
,
8026 section_size_type erratum_insn_offset
,
8027 Address erratum_address
,
8028 typename
Insn_utilities::Insntype erratum_insn
,
8030 unsigned int e843419_adrp_offset
)
8032 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
8033 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
8034 gold_assert(stub_table
!= NULL
);
8035 if (stub_table
->find_erratum_stub(relobj
,
8037 erratum_insn_offset
) == NULL
)
8039 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8040 The_erratum_stub
* stub
;
8041 if (erratum_type
== ST_E_835769
)
8042 stub
= new The_erratum_stub(relobj
, erratum_type
, shndx
,
8043 erratum_insn_offset
);
8044 else if (erratum_type
== ST_E_843419
)
8045 stub
= new E843419_stub
<size
, big_endian
>(
8046 relobj
, shndx
, erratum_insn_offset
, e843419_adrp_offset
);
8049 stub
->set_erratum_insn(erratum_insn
);
8050 stub
->set_erratum_address(erratum_address
);
8051 // For erratum ST_E_843419 and ST_E_835769, the destination address is
8052 // always the next insn after erratum insn.
8053 stub
->set_destination_address(erratum_address
+ BPI
);
8054 stub_table
->add_erratum_stub(stub
);
8059 // Scan erratum for section SHNDX range [output_address + span_start,
8060 // output_address + span_end). Note here we do not share the code with
8061 // scan_erratum_843419_span function, because for 843419 we optimize by only
8062 // scanning the last few insns of a page, whereas for 835769, we need to scan
8065 template<int size
, bool big_endian
>
8067 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
8068 AArch64_relobj
<size
, big_endian
>* relobj
,
8070 const section_size_type span_start
,
8071 const section_size_type span_end
,
8072 unsigned char* input_view
,
8073 Address output_address
)
8075 typedef typename
Insn_utilities::Insntype Insntype
;
8077 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
8079 // Adjust output_address and view to the start of span.
8080 output_address
+= span_start
;
8081 input_view
+= span_start
;
8083 section_size_type span_length
= span_end
- span_start
;
8084 section_size_type offset
= 0;
8085 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
8087 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8088 Insntype insn1
= ip
[0];
8089 Insntype insn2
= ip
[1];
8090 if (is_erratum_835769_sequence(insn1
, insn2
))
8092 Insntype erratum_insn
= insn2
;
8093 // "span_start + offset" is the offset for insn1. So for insn2, it is
8094 // "span_start + offset + BPI".
8095 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
8096 Address erratum_address
= output_address
+ offset
+ BPI
;
8097 gold_info(_("Erratum 835769 found and fixed at \"%s\", "
8098 "section %d, offset 0x%08x."),
8099 relobj
->name().c_str(), shndx
,
8100 (unsigned int)(span_start
+ offset
));
8102 this->create_erratum_stub(relobj
, shndx
,
8103 erratum_insn_offset
, erratum_address
,
8104 erratum_insn
, ST_E_835769
);
8105 offset
+= BPI
; // Skip mac insn.
8108 } // End of "Target_aarch64::scan_erratum_835769_span".
8111 // Scan erratum for section SHNDX range
8112 // [output_address + span_start, output_address + span_end).
8114 template<int size
, bool big_endian
>
8116 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
8117 AArch64_relobj
<size
, big_endian
>* relobj
,
8119 const section_size_type span_start
,
8120 const section_size_type span_end
,
8121 unsigned char* input_view
,
8122 Address output_address
)
8124 typedef typename
Insn_utilities::Insntype Insntype
;
8126 // Adjust output_address and view to the start of span.
8127 output_address
+= span_start
;
8128 input_view
+= span_start
;
8130 if ((output_address
& 0x03) != 0)
8133 section_size_type offset
= 0;
8134 section_size_type span_length
= span_end
- span_start
;
8135 // The first instruction must be ending at 0xFF8 or 0xFFC.
8136 unsigned int page_offset
= output_address
& 0xFFF;
8137 // Make sure starting position, that is "output_address+offset",
8138 // starts at page position 0xff8 or 0xffc.
8139 if (page_offset
< 0xff8)
8140 offset
= 0xff8 - page_offset
;
8141 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8143 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
8144 Insntype insn1
= ip
[0];
8145 if (Insn_utilities::is_adrp(insn1
))
8147 Insntype insn2
= ip
[1];
8148 Insntype insn3
= ip
[2];
8149 Insntype erratum_insn
;
8150 unsigned insn_offset
;
8151 bool do_report
= false;
8152 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
8155 erratum_insn
= insn3
;
8156 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
8158 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8160 // Optionally we can have an insn between ins2 and ins3
8161 Insntype insn_opt
= ip
[2];
8162 // And insn_opt must not be a branch.
8163 if (!Insn_utilities::aarch64_b(insn_opt
)
8164 && !Insn_utilities::aarch64_bl(insn_opt
)
8165 && !Insn_utilities::aarch64_blr(insn_opt
)
8166 && !Insn_utilities::aarch64_br(insn_opt
))
8168 // And insn_opt must not write to dest reg in insn1. However
8169 // we do a conservative scan, which means we may fix/report
8170 // more than necessary, but it doesn't hurt.
8172 Insntype insn4
= ip
[3];
8173 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8176 erratum_insn
= insn4
;
8177 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8183 gold_info(_("Erratum 843419 found and fixed at \"%s\", "
8184 "section %d, offset 0x%08x."),
8185 relobj
->name().c_str(), shndx
,
8186 (unsigned int)(span_start
+ offset
));
8187 unsigned int erratum_insn_offset
=
8188 span_start
+ offset
+ insn_offset
;
8189 Address erratum_address
=
8190 output_address
+ offset
+ insn_offset
;
8191 create_erratum_stub(relobj
, shndx
,
8192 erratum_insn_offset
, erratum_address
,
8193 erratum_insn
, ST_E_843419
,
8194 span_start
+ offset
);
8198 // Advance to next candidate instruction. We only consider instruction
8199 // sequences starting at a page offset of 0xff8 or 0xffc.
8200 page_offset
= (output_address
+ offset
) & 0xfff;
8201 if (page_offset
== 0xff8)
8203 else // (page_offset == 0xffc), we move to next page's 0xff8.
8206 } // End of "Target_aarch64::scan_erratum_843419_span".
8209 // The selector for aarch64 object files.
8211 template<int size
, bool big_endian
>
8212 class Target_selector_aarch64
: public Target_selector
8215 Target_selector_aarch64();
8218 do_instantiate_target()
8219 { return new Target_aarch64
<size
, big_endian
>(); }
8223 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8224 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8225 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8229 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8230 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8231 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8235 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8236 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8237 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8241 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8242 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8243 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8246 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8247 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8248 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8249 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8251 } // End anonymous namespace.