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_adrp(const Insntype insn
)
107 { return (insn
& 0x9F000000) == 0x90000000; }
110 aarch64_rm(const Insntype insn
)
111 { return aarch64_bits(insn
, 16, 5); }
114 aarch64_rn(const Insntype insn
)
115 { return aarch64_bits(insn
, 5, 5); }
118 aarch64_rd(const Insntype insn
)
119 { return aarch64_bits(insn
, 0, 5); }
122 aarch64_rt(const Insntype insn
)
123 { return aarch64_bits(insn
, 0, 5); }
126 aarch64_rt2(const Insntype insn
)
127 { return aarch64_bits(insn
, 10, 5); }
130 aarch64_b(const Insntype insn
)
131 { return (insn
& 0xFC000000) == 0x14000000; }
134 aarch64_bl(const Insntype insn
)
135 { return (insn
& 0xFC000000) == 0x94000000; }
138 aarch64_blr(const Insntype insn
)
139 { return (insn
& 0xFFFFFC1F) == 0xD63F0000; }
142 aarch64_br(const Insntype insn
)
143 { return (insn
& 0xFFFFFC1F) == 0xD61F0000; }
145 // All ld/st ops. See C4-182 of the ARM ARM. The encoding space for
146 // LD_PCREL, LDST_RO, LDST_UI and LDST_UIMM cover prefetch ops.
148 aarch64_ld(Insntype insn
) { return aarch64_bit(insn
, 22) == 1; }
151 aarch64_ldst(Insntype insn
)
152 { return (insn
& 0x0a000000) == 0x08000000; }
155 aarch64_ldst_ex(Insntype insn
)
156 { return (insn
& 0x3f000000) == 0x08000000; }
159 aarch64_ldst_pcrel(Insntype insn
)
160 { return (insn
& 0x3b000000) == 0x18000000; }
163 aarch64_ldst_nap(Insntype insn
)
164 { return (insn
& 0x3b800000) == 0x28000000; }
167 aarch64_ldstp_pi(Insntype insn
)
168 { return (insn
& 0x3b800000) == 0x28800000; }
171 aarch64_ldstp_o(Insntype insn
)
172 { return (insn
& 0x3b800000) == 0x29000000; }
175 aarch64_ldstp_pre(Insntype insn
)
176 { return (insn
& 0x3b800000) == 0x29800000; }
179 aarch64_ldst_ui(Insntype insn
)
180 { return (insn
& 0x3b200c00) == 0x38000000; }
183 aarch64_ldst_piimm(Insntype insn
)
184 { return (insn
& 0x3b200c00) == 0x38000400; }
187 aarch64_ldst_u(Insntype insn
)
188 { return (insn
& 0x3b200c00) == 0x38000800; }
191 aarch64_ldst_preimm(Insntype insn
)
192 { return (insn
& 0x3b200c00) == 0x38000c00; }
195 aarch64_ldst_ro(Insntype insn
)
196 { return (insn
& 0x3b200c00) == 0x38200800; }
199 aarch64_ldst_uimm(Insntype insn
)
200 { return (insn
& 0x3b000000) == 0x39000000; }
203 aarch64_ldst_simd_m(Insntype insn
)
204 { return (insn
& 0xbfbf0000) == 0x0c000000; }
207 aarch64_ldst_simd_m_pi(Insntype insn
)
208 { return (insn
& 0xbfa00000) == 0x0c800000; }
211 aarch64_ldst_simd_s(Insntype insn
)
212 { return (insn
& 0xbf9f0000) == 0x0d000000; }
215 aarch64_ldst_simd_s_pi(Insntype insn
)
216 { return (insn
& 0xbf800000) == 0x0d800000; }
218 // Classify an INSN if it is indeed a load/store. Return true if INSN is a
219 // LD/ST instruction otherwise return false. For scalar LD/ST instructions
220 // PAIR is FALSE, RT is returned and RT2 is set equal to RT. For LD/ST pair
221 // instructions PAIR is TRUE, RT and RT2 are returned.
223 aarch64_mem_op_p(Insntype insn
, unsigned int *rt
, unsigned int *rt2
,
224 bool *pair
, bool *load
)
232 /* Bail out quickly if INSN doesn't fall into the the load-store
234 if (!aarch64_ldst (insn
))
239 if (aarch64_ldst_ex (insn
))
241 *rt
= aarch64_rt (insn
);
243 if (aarch64_bit (insn
, 21) == 1)
246 *rt2
= aarch64_rt2 (insn
);
248 *load
= aarch64_ld (insn
);
251 else if (aarch64_ldst_nap (insn
)
252 || aarch64_ldstp_pi (insn
)
253 || aarch64_ldstp_o (insn
)
254 || aarch64_ldstp_pre (insn
))
257 *rt
= aarch64_rt (insn
);
258 *rt2
= aarch64_rt2 (insn
);
259 *load
= aarch64_ld (insn
);
262 else if (aarch64_ldst_pcrel (insn
)
263 || aarch64_ldst_ui (insn
)
264 || aarch64_ldst_piimm (insn
)
265 || aarch64_ldst_u (insn
)
266 || aarch64_ldst_preimm (insn
)
267 || aarch64_ldst_ro (insn
)
268 || aarch64_ldst_uimm (insn
))
270 *rt
= aarch64_rt (insn
);
272 if (aarch64_ldst_pcrel (insn
))
274 opc
= aarch64_bits (insn
, 22, 2);
275 v
= aarch64_bit (insn
, 26);
276 opc_v
= opc
| (v
<< 2);
277 *load
= (opc_v
== 1 || opc_v
== 2 || opc_v
== 3
278 || opc_v
== 5 || opc_v
== 7);
281 else if (aarch64_ldst_simd_m (insn
)
282 || aarch64_ldst_simd_m_pi (insn
))
284 *rt
= aarch64_rt (insn
);
285 *load
= aarch64_bit (insn
, 22);
286 opcode
= (insn
>> 12) & 0xf;
313 else if (aarch64_ldst_simd_s (insn
)
314 || aarch64_ldst_simd_s_pi (insn
))
316 *rt
= aarch64_rt (insn
);
317 r
= (insn
>> 21) & 1;
318 *load
= aarch64_bit (insn
, 22);
319 opcode
= (insn
>> 13) & 0x7;
331 *rt2
= *rt
+ (r
== 0 ? 2 : 3);
339 *rt2
= *rt
+ (r
== 0 ? 2 : 3);
348 } // End of "aarch64_mem_op_p".
350 // Return true if INSN is mac insn.
352 aarch64_mac(Insntype insn
)
353 { return (insn
& 0xff000000) == 0x9b000000; }
355 // Return true if INSN is multiply-accumulate.
356 // (This is similar to implementaton in elfnn-aarch64.c.)
358 aarch64_mlxl(Insntype insn
)
360 uint32_t op31
= aarch64_op31(insn
);
361 if (aarch64_mac(insn
)
362 && (op31
== 0 || op31
== 1 || op31
== 5)
363 /* Exclude MUL instructions which are encoded as a multiple-accumulate
365 && aarch64_ra(insn
) != AARCH64_ZR
)
371 }; // End of "AArch64_insn_utilities".
374 // Insn length in byte.
376 template<bool big_endian
>
377 const int AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
= 4;
380 // Zero register encoding - 31.
382 template<bool big_endian
>
383 const unsigned int AArch64_insn_utilities
<big_endian
>::AARCH64_ZR
= 0x1f;
386 // Output_data_got_aarch64 class.
388 template<int size
, bool big_endian
>
389 class Output_data_got_aarch64
: public Output_data_got
<size
, big_endian
>
392 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Valtype
;
393 Output_data_got_aarch64(Symbol_table
* symtab
, Layout
* layout
)
394 : Output_data_got
<size
, big_endian
>(),
395 symbol_table_(symtab
), layout_(layout
)
398 // Add a static entry for the GOT entry at OFFSET. GSYM is a global
399 // symbol and R_TYPE is the code of a dynamic relocation that needs to be
400 // applied in a static link.
402 add_static_reloc(unsigned int got_offset
, unsigned int r_type
, Symbol
* gsym
)
403 { this->static_relocs_
.push_back(Static_reloc(got_offset
, r_type
, gsym
)); }
406 // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object
407 // defining a local symbol with INDEX. R_TYPE is the code of a dynamic
408 // relocation that needs to be applied in a static link.
410 add_static_reloc(unsigned int got_offset
, unsigned int r_type
,
411 Sized_relobj_file
<size
, big_endian
>* relobj
,
414 this->static_relocs_
.push_back(Static_reloc(got_offset
, r_type
, relobj
,
420 // Write out the GOT table.
422 do_write(Output_file
* of
) {
423 // The first entry in the GOT is the address of the .dynamic section.
424 gold_assert(this->data_size() >= size
/ 8);
425 Output_section
* dynamic
= this->layout_
->dynamic_section();
426 Valtype dynamic_addr
= dynamic
== NULL
? 0 : dynamic
->address();
427 this->replace_constant(0, dynamic_addr
);
428 Output_data_got
<size
, big_endian
>::do_write(of
);
430 // Handling static relocs
431 if (this->static_relocs_
.empty())
434 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
436 gold_assert(parameters
->doing_static_link());
437 const off_t offset
= this->offset();
438 const section_size_type oview_size
=
439 convert_to_section_size_type(this->data_size());
440 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
442 Output_segment
* tls_segment
= this->layout_
->tls_segment();
443 gold_assert(tls_segment
!= NULL
);
445 AArch64_address aligned_tcb_address
=
446 align_address(Target_aarch64
<size
, big_endian
>::TCB_SIZE
,
447 tls_segment
->maximum_alignment());
449 for (size_t i
= 0; i
< this->static_relocs_
.size(); ++i
)
451 Static_reloc
& reloc(this->static_relocs_
[i
]);
452 AArch64_address value
;
454 if (!reloc
.symbol_is_global())
456 Sized_relobj_file
<size
, big_endian
>* object
= reloc
.relobj();
457 const Symbol_value
<size
>* psymval
=
458 reloc
.relobj()->local_symbol(reloc
.index());
460 // We are doing static linking. Issue an error and skip this
461 // relocation if the symbol is undefined or in a discarded_section.
463 unsigned int shndx
= psymval
->input_shndx(&is_ordinary
);
464 if ((shndx
== elfcpp::SHN_UNDEF
)
466 && shndx
!= elfcpp::SHN_UNDEF
467 && !object
->is_section_included(shndx
)
468 && !this->symbol_table_
->is_section_folded(object
, shndx
)))
470 gold_error(_("undefined or discarded local symbol %u from "
471 " object %s in GOT"),
472 reloc
.index(), reloc
.relobj()->name().c_str());
475 value
= psymval
->value(object
, 0);
479 const Symbol
* gsym
= reloc
.symbol();
480 gold_assert(gsym
!= NULL
);
481 if (gsym
->is_forwarder())
482 gsym
= this->symbol_table_
->resolve_forwards(gsym
);
484 // We are doing static linking. Issue an error and skip this
485 // relocation if the symbol is undefined or in a discarded_section
486 // unless it is a weakly_undefined symbol.
487 if ((gsym
->is_defined_in_discarded_section()
488 || gsym
->is_undefined())
489 && !gsym
->is_weak_undefined())
491 gold_error(_("undefined or discarded symbol %s in GOT"),
496 if (!gsym
->is_weak_undefined())
498 const Sized_symbol
<size
>* sym
=
499 static_cast<const Sized_symbol
<size
>*>(gsym
);
500 value
= sym
->value();
506 unsigned got_offset
= reloc
.got_offset();
507 gold_assert(got_offset
< oview_size
);
509 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype Valtype
;
510 Valtype
* wv
= reinterpret_cast<Valtype
*>(oview
+ got_offset
);
512 switch (reloc
.r_type())
514 case elfcpp::R_AARCH64_TLS_DTPREL64
:
517 case elfcpp::R_AARCH64_TLS_TPREL64
:
518 x
= value
+ aligned_tcb_address
;
523 elfcpp::Swap
<size
, big_endian
>::writeval(wv
, x
);
526 of
->write_output_view(offset
, oview_size
, oview
);
530 // Symbol table of the output object.
531 Symbol_table
* symbol_table_
;
532 // A pointer to the Layout class, so that we can find the .dynamic
533 // section when we write out the GOT section.
536 // This class represent dynamic relocations that need to be applied by
537 // gold because we are using TLS relocations in a static link.
541 Static_reloc(unsigned int got_offset
, unsigned int r_type
, Symbol
* gsym
)
542 : got_offset_(got_offset
), r_type_(r_type
), symbol_is_global_(true)
543 { this->u_
.global
.symbol
= gsym
; }
545 Static_reloc(unsigned int got_offset
, unsigned int r_type
,
546 Sized_relobj_file
<size
, big_endian
>* relobj
, unsigned int index
)
547 : got_offset_(got_offset
), r_type_(r_type
), symbol_is_global_(false)
549 this->u_
.local
.relobj
= relobj
;
550 this->u_
.local
.index
= index
;
553 // Return the GOT offset.
556 { return this->got_offset_
; }
561 { return this->r_type_
; }
563 // Whether the symbol is global or not.
565 symbol_is_global() const
566 { return this->symbol_is_global_
; }
568 // For a relocation against a global symbol, the global symbol.
572 gold_assert(this->symbol_is_global_
);
573 return this->u_
.global
.symbol
;
576 // For a relocation against a local symbol, the defining object.
577 Sized_relobj_file
<size
, big_endian
>*
580 gold_assert(!this->symbol_is_global_
);
581 return this->u_
.local
.relobj
;
584 // For a relocation against a local symbol, the local symbol index.
588 gold_assert(!this->symbol_is_global_
);
589 return this->u_
.local
.index
;
593 // GOT offset of the entry to which this relocation is applied.
594 unsigned int got_offset_
;
595 // Type of relocation.
596 unsigned int r_type_
;
597 // Whether this relocation is against a global symbol.
598 bool symbol_is_global_
;
599 // A global or local symbol.
604 // For a global symbol, the symbol itself.
609 // For a local symbol, the object defining the symbol.
610 Sized_relobj_file
<size
, big_endian
>* relobj
;
611 // For a local symbol, the symbol index.
615 }; // End of inner class Static_reloc
617 std::vector
<Static_reloc
> static_relocs_
;
618 }; // End of Output_data_got_aarch64
621 template<int size
, bool big_endian
>
622 class AArch64_input_section
;
625 template<int size
, bool big_endian
>
626 class AArch64_output_section
;
629 template<int size
, bool big_endian
>
630 class AArch64_relobj
;
633 // Stub type enum constants.
639 // Using adrp/add pair, 4 insns (including alignment) without mem access,
640 // the fastest stub. This has a limited jump distance, which is tested by
641 // aarch64_valid_for_adrp_p.
644 // Using ldr-absolute-address/br-register, 4 insns with 1 mem access,
645 // unlimited in jump distance.
646 ST_LONG_BRANCH_ABS
= 2,
648 // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1
649 // mem access, slowest one. Only used in position independent executables.
650 ST_LONG_BRANCH_PCREL
= 3,
652 // Stub for erratum 843419 handling.
655 // Stub for erratum 835769 handling.
658 // Number of total stub types.
663 // Struct that wraps insns for a particular stub. All stub templates are
664 // created/initialized as constants by Stub_template_repertoire.
666 template<bool big_endian
>
669 const typename AArch64_insn_utilities
<big_endian
>::Insntype
* insns
;
674 // Simple singleton class that creates/initializes/stores all types of stub
677 template<bool big_endian
>
678 class Stub_template_repertoire
681 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
683 // Single static method to get stub template for a given stub type.
684 static const Stub_template
<big_endian
>*
685 get_stub_template(int type
)
687 static Stub_template_repertoire
<big_endian
> singleton
;
688 return singleton
.stub_templates_
[type
];
692 // Constructor - creates/initializes all stub templates.
693 Stub_template_repertoire();
694 ~Stub_template_repertoire()
697 // Disallowing copy ctor and copy assignment operator.
698 Stub_template_repertoire(Stub_template_repertoire
&);
699 Stub_template_repertoire
& operator=(Stub_template_repertoire
&);
701 // Data that stores all insn templates.
702 const Stub_template
<big_endian
>* stub_templates_
[ST_NUMBER
];
703 }; // End of "class Stub_template_repertoire".
706 // Constructor - creates/initilizes all stub templates.
708 template<bool big_endian
>
709 Stub_template_repertoire
<big_endian
>::Stub_template_repertoire()
711 // Insn array definitions.
712 const static Insntype ST_NONE_INSNS
[] = {};
714 const static Insntype ST_ADRP_BRANCH_INSNS
[] =
716 0x90000010, /* adrp ip0, X */
717 /* ADR_PREL_PG_HI21(X) */
718 0x91000210, /* add ip0, ip0, :lo12:X */
719 /* ADD_ABS_LO12_NC(X) */
720 0xd61f0200, /* br ip0 */
721 0x00000000, /* alignment padding */
724 const static Insntype ST_LONG_BRANCH_ABS_INSNS
[] =
726 0x58000050, /* ldr ip0, 0x8 */
727 0xd61f0200, /* br ip0 */
728 0x00000000, /* address field */
729 0x00000000, /* address fields */
732 const static Insntype ST_LONG_BRANCH_PCREL_INSNS
[] =
734 0x58000090, /* ldr ip0, 0x10 */
735 0x10000011, /* adr ip1, #0 */
736 0x8b110210, /* add ip0, ip0, ip1 */
737 0xd61f0200, /* br ip0 */
738 0x00000000, /* address field */
739 0x00000000, /* address field */
740 0x00000000, /* alignment padding */
741 0x00000000, /* alignment padding */
744 const static Insntype ST_E_843419_INSNS
[] =
746 0x00000000, /* Placeholder for erratum insn. */
747 0x14000000, /* b <label> */
750 // ST_E_835769 has the same stub template as ST_E_843419.
751 const static Insntype
* ST_E_835769_INSNS
= ST_E_843419_INSNS
;
753 #define install_insn_template(T) \
754 const static Stub_template<big_endian> template_##T = { \
755 T##_INSNS, sizeof(T##_INSNS) / sizeof(T##_INSNS[0]) }; \
756 this->stub_templates_[T] = &template_##T
758 install_insn_template(ST_NONE
);
759 install_insn_template(ST_ADRP_BRANCH
);
760 install_insn_template(ST_LONG_BRANCH_ABS
);
761 install_insn_template(ST_LONG_BRANCH_PCREL
);
762 install_insn_template(ST_E_843419
);
763 install_insn_template(ST_E_835769
);
765 #undef install_insn_template
769 // Base class for stubs.
771 template<int size
, bool big_endian
>
775 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
776 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
778 static const AArch64_address invalid_address
=
779 static_cast<AArch64_address
>(-1);
781 static const section_offset_type invalid_offset
=
782 static_cast<section_offset_type
>(-1);
785 : destination_address_(invalid_address
),
786 offset_(invalid_offset
),
796 { return this->type_
; }
798 // Get stub template that provides stub insn information.
799 const Stub_template
<big_endian
>*
800 stub_template() const
802 return Stub_template_repertoire
<big_endian
>::
803 get_stub_template(this->type());
806 // Get destination address.
808 destination_address() const
810 gold_assert(this->destination_address_
!= this->invalid_address
);
811 return this->destination_address_
;
814 // Set destination address.
816 set_destination_address(AArch64_address address
)
818 gold_assert(address
!= this->invalid_address
);
819 this->destination_address_
= address
;
822 // Reset the destination address.
824 reset_destination_address()
825 { this->destination_address_
= this->invalid_address
; }
827 // Get offset of code stub. For Reloc_stub, it is the offset from the
828 // beginning of its containing stub table; for Erratum_stub, it is the offset
829 // from the end of reloc_stubs.
833 gold_assert(this->offset_
!= this->invalid_offset
);
834 return this->offset_
;
839 set_offset(section_offset_type offset
)
840 { this->offset_
= offset
; }
842 // Return the stub insn.
845 { return this->stub_template()->insns
; }
847 // Return num of stub insns.
850 { return this->stub_template()->insn_num
; }
852 // Get size of the stub.
856 return this->insn_num() *
857 AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
860 // Write stub to output file.
862 write(unsigned char* view
, section_size_type view_size
)
863 { this->do_write(view
, view_size
); }
866 // Abstract method to be implemented by sub-classes.
868 do_write(unsigned char*, section_size_type
) = 0;
871 // The last insn of a stub is a jump to destination insn. This field records
872 // the destination address.
873 AArch64_address destination_address_
;
874 // The stub offset. Note this has difference interpretations between an
875 // Reloc_stub and an Erratum_stub. For Reloc_stub this is the offset from the
876 // beginning of the containing stub_table, whereas for Erratum_stub, this is
877 // the offset from the end of reloc_stubs.
878 section_offset_type offset_
;
881 }; // End of "Stub_base".
884 // Erratum stub class. An erratum stub differs from a reloc stub in that for
885 // each erratum occurrence, we generate an erratum stub. We never share erratum
886 // stubs, whereas for reloc stubs, different branches insns share a single reloc
887 // stub as long as the branch targets are the same. (More to the point, reloc
888 // stubs can be shared because they're used to reach a specific target, whereas
889 // erratum stubs branch back to the original control flow.)
891 template<int size
, bool big_endian
>
892 class Erratum_stub
: public Stub_base
<size
, big_endian
>
895 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
896 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
897 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
898 typedef typename AArch64_insn_utilities
<big_endian
>::Insntype Insntype
;
900 static const int STUB_ADDR_ALIGN
;
902 static const Insntype invalid_insn
= static_cast<Insntype
>(-1);
904 Erratum_stub(The_aarch64_relobj
* relobj
, int type
,
905 unsigned shndx
, unsigned int sh_offset
)
906 : Stub_base
<size
, big_endian
>(type
), relobj_(relobj
),
907 shndx_(shndx
), sh_offset_(sh_offset
),
908 erratum_insn_(invalid_insn
),
909 erratum_address_(this->invalid_address
)
914 // Return the object that contains the erratum.
917 { return this->relobj_
; }
919 // Get section index of the erratum.
922 { return this->shndx_
; }
924 // Get section offset of the erratum.
927 { return this->sh_offset_
; }
929 // Get the erratum insn. This is the insn located at erratum_insn_address.
933 gold_assert(this->erratum_insn_
!= this->invalid_insn
);
934 return this->erratum_insn_
;
937 // Set the insn that the erratum happens to.
939 set_erratum_insn(Insntype insn
)
940 { this->erratum_insn_
= insn
; }
942 // For 843419, the erratum insn is ld/st xt, [xn, #uimm], which may be a
943 // relocation spot, in this case, the erratum_insn_ recorded at scanning phase
944 // is no longer the one we want to write out to the stub, update erratum_insn_
945 // with relocated version. Also note that in this case xn must not be "PC", so
946 // it is safe to move the erratum insn from the origin place to the stub. For
947 // 835769, the erratum insn is multiply-accumulate insn, which could not be a
948 // relocation spot (assertion added though).
950 update_erratum_insn(Insntype insn
)
952 gold_assert(this->erratum_insn_
!= this->invalid_insn
);
953 switch (this->type())
956 gold_assert(Insn_utilities::aarch64_ldst_uimm(insn
));
957 gold_assert(Insn_utilities::aarch64_ldst_uimm(this->erratum_insn()));
958 gold_assert(Insn_utilities::aarch64_rd(insn
) ==
959 Insn_utilities::aarch64_rd(this->erratum_insn()));
960 gold_assert(Insn_utilities::aarch64_rn(insn
) ==
961 Insn_utilities::aarch64_rn(this->erratum_insn()));
962 // Update plain ld/st insn with relocated insn.
963 this->erratum_insn_
= insn
;
966 gold_assert(insn
== this->erratum_insn());
974 // Return the address where an erratum must be done.
976 erratum_address() const
978 gold_assert(this->erratum_address_
!= this->invalid_address
);
979 return this->erratum_address_
;
982 // Set the address where an erratum must be done.
984 set_erratum_address(AArch64_address addr
)
985 { this->erratum_address_
= addr
; }
987 // Comparator used to group Erratum_stubs in a set by (obj, shndx,
988 // sh_offset). We do not include 'type' in the calculation, becuase there is
989 // at most one stub type at (obj, shndx, sh_offset).
991 operator<(const Erratum_stub
<size
, big_endian
>& k
) const
995 // We group stubs by relobj.
996 if (this->relobj_
!= k
.relobj_
)
997 return this->relobj_
< k
.relobj_
;
998 // Then by section index.
999 if (this->shndx_
!= k
.shndx_
)
1000 return this->shndx_
< k
.shndx_
;
1001 // Lastly by section offset.
1002 return this->sh_offset_
< k
.sh_offset_
;
1007 do_write(unsigned char*, section_size_type
);
1010 // The object that needs to be fixed.
1011 The_aarch64_relobj
* relobj_
;
1012 // The shndx in the object that needs to be fixed.
1013 const unsigned int shndx_
;
1014 // The section offset in the obejct that needs to be fixed.
1015 const unsigned int sh_offset_
;
1016 // The insn to be fixed.
1017 Insntype erratum_insn_
;
1018 // The address of the above insn.
1019 AArch64_address erratum_address_
;
1020 }; // End of "Erratum_stub".
1022 template<int size
, bool big_endian
>
1023 const int Erratum_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1025 // Comparator used in set definition.
1026 template<int size
, bool big_endian
>
1027 struct Erratum_stub_less
1030 operator()(const Erratum_stub
<size
, big_endian
>* s1
,
1031 const Erratum_stub
<size
, big_endian
>* s2
) const
1032 { return *s1
< *s2
; }
1035 // Erratum_stub implementation for writing stub to output file.
1037 template<int size
, bool big_endian
>
1039 Erratum_stub
<size
, big_endian
>::do_write(unsigned char* view
, section_size_type
)
1041 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1042 const Insntype
* insns
= this->insns();
1043 uint32_t num_insns
= this->insn_num();
1044 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1045 // For current implemented erratum 843419 and 835769, the first insn in the
1046 // stub is always a copy of the problematic insn (in 843419, the mem access
1047 // insn, in 835769, the mac insn), followed by a jump-back.
1048 elfcpp::Swap
<32, big_endian
>::writeval(ip
, this->erratum_insn());
1049 for (uint32_t i
= 1; i
< num_insns
; ++i
)
1050 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1054 // Reloc stub class.
1056 template<int size
, bool big_endian
>
1057 class Reloc_stub
: public Stub_base
<size
, big_endian
>
1060 typedef Reloc_stub
<size
, big_endian
> This
;
1061 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1063 // Branch range. This is used to calculate the section group size, as well as
1064 // determine whether a stub is needed.
1065 static const int MAX_BRANCH_OFFSET
= ((1 << 25) - 1) << 2;
1066 static const int MIN_BRANCH_OFFSET
= -((1 << 25) << 2);
1068 // Constant used to determine if an offset fits in the adrp instruction
1070 static const int MAX_ADRP_IMM
= (1 << 20) - 1;
1071 static const int MIN_ADRP_IMM
= -(1 << 20);
1073 static const int BYTES_PER_INSN
= 4;
1074 static const int STUB_ADDR_ALIGN
;
1076 // Determine whether the offset fits in the jump/branch instruction.
1078 aarch64_valid_branch_offset_p(int64_t offset
)
1079 { return offset
>= MIN_BRANCH_OFFSET
&& offset
<= MAX_BRANCH_OFFSET
; }
1081 // Determine whether the offset fits in the adrp immediate field.
1083 aarch64_valid_for_adrp_p(AArch64_address location
, AArch64_address dest
)
1085 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
1086 int64_t adrp_imm
= (Reloc::Page(dest
) - Reloc::Page(location
)) >> 12;
1087 return adrp_imm
>= MIN_ADRP_IMM
&& adrp_imm
<= MAX_ADRP_IMM
;
1090 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1093 stub_type_for_reloc(unsigned int r_type
, AArch64_address address
,
1094 AArch64_address target
);
1096 Reloc_stub(int type
)
1097 : Stub_base
<size
, big_endian
>(type
)
1103 // The key class used to index the stub instance in the stub table's stub map.
1107 Key(int type
, const Symbol
* symbol
, const Relobj
* relobj
,
1108 unsigned int r_sym
, int32_t addend
)
1109 : type_(type
), addend_(addend
)
1113 this->r_sym_
= Reloc_stub::invalid_index
;
1114 this->u_
.symbol
= symbol
;
1118 gold_assert(relobj
!= NULL
&& r_sym
!= invalid_index
);
1119 this->r_sym_
= r_sym
;
1120 this->u_
.relobj
= relobj
;
1127 // Return stub type.
1130 { return this->type_
; }
1132 // Return the local symbol index or invalid_index.
1135 { return this->r_sym_
; }
1137 // Return the symbol if there is one.
1140 { return this->r_sym_
== invalid_index
? this->u_
.symbol
: NULL
; }
1142 // Return the relobj if there is one.
1145 { return this->r_sym_
!= invalid_index
? this->u_
.relobj
: NULL
; }
1147 // Whether this equals to another key k.
1149 eq(const Key
& k
) const
1151 return ((this->type_
== k
.type_
)
1152 && (this->r_sym_
== k
.r_sym_
)
1153 && ((this->r_sym_
!= Reloc_stub::invalid_index
)
1154 ? (this->u_
.relobj
== k
.u_
.relobj
)
1155 : (this->u_
.symbol
== k
.u_
.symbol
))
1156 && (this->addend_
== k
.addend_
));
1159 // Return a hash value.
1163 size_t name_hash_value
= gold::string_hash
<char>(
1164 (this->r_sym_
!= Reloc_stub::invalid_index
)
1165 ? this->u_
.relobj
->name().c_str()
1166 : this->u_
.symbol
->name());
1167 // We only have 4 stub types.
1168 size_t stub_type_hash_value
= 0x03 & this->type_
;
1169 return (name_hash_value
1170 ^ stub_type_hash_value
1171 ^ ((this->r_sym_
& 0x3fff) << 2)
1172 ^ ((this->addend_
& 0xffff) << 16));
1175 // Functors for STL associative containers.
1179 operator()(const Key
& k
) const
1180 { return k
.hash_value(); }
1186 operator()(const Key
& k1
, const Key
& k2
) const
1187 { return k1
.eq(k2
); }
1193 // If this is a local symbol, this is the index in the defining object.
1194 // Otherwise, it is invalid_index for a global symbol.
1195 unsigned int r_sym_
;
1196 // If r_sym_ is an invalid index, this points to a global symbol.
1197 // Otherwise, it points to a relobj. We used the unsized and target
1198 // independent Symbol and Relobj classes instead of Sized_symbol<32> and
1199 // Arm_relobj, in order to avoid making the stub class a template
1200 // as most of the stub machinery is endianness-neutral. However, it
1201 // may require a bit of casting done by users of this class.
1204 const Symbol
* symbol
;
1205 const Relobj
* relobj
;
1207 // Addend associated with a reloc.
1209 }; // End of inner class Reloc_stub::Key
1212 // This may be overridden in the child class.
1214 do_write(unsigned char*, section_size_type
);
1217 static const unsigned int invalid_index
= static_cast<unsigned int>(-1);
1218 }; // End of Reloc_stub
1220 template<int size
, bool big_endian
>
1221 const int Reloc_stub
<size
, big_endian
>::STUB_ADDR_ALIGN
= 4;
1223 // Write data to output file.
1225 template<int size
, bool big_endian
>
1227 Reloc_stub
<size
, big_endian
>::
1228 do_write(unsigned char* view
, section_size_type
)
1230 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
1231 const uint32_t* insns
= this->insns();
1232 uint32_t num_insns
= this->insn_num();
1233 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
1234 for (uint32_t i
= 0; i
< num_insns
; ++i
)
1235 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ i
, insns
[i
]);
1239 // Determine the stub type for a certain relocation or ST_NONE, if no stub is
1242 template<int size
, bool big_endian
>
1244 Reloc_stub
<size
, big_endian
>::stub_type_for_reloc(
1245 unsigned int r_type
, AArch64_address location
, AArch64_address dest
)
1247 int64_t branch_offset
= 0;
1250 case elfcpp::R_AARCH64_CALL26
:
1251 case elfcpp::R_AARCH64_JUMP26
:
1252 branch_offset
= dest
- location
;
1258 if (aarch64_valid_branch_offset_p(branch_offset
))
1261 if (aarch64_valid_for_adrp_p(location
, dest
))
1262 return ST_ADRP_BRANCH
;
1264 if (parameters
->options().output_is_position_independent()
1265 && parameters
->options().output_is_executable())
1266 return ST_LONG_BRANCH_PCREL
;
1268 return ST_LONG_BRANCH_ABS
;
1271 // A class to hold stubs for the ARM target.
1273 template<int size
, bool big_endian
>
1274 class Stub_table
: public Output_data
1277 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1278 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1279 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
1280 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1281 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
1282 typedef typename
The_reloc_stub::Key The_reloc_stub_key
;
1283 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1284 typedef Erratum_stub_less
<size
, big_endian
> The_erratum_stub_less
;
1285 typedef typename
The_reloc_stub_key::hash The_reloc_stub_key_hash
;
1286 typedef typename
The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to
;
1287 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1288 typedef Unordered_map
<The_reloc_stub_key
, The_reloc_stub
*,
1289 The_reloc_stub_key_hash
, The_reloc_stub_key_equal_to
>
1291 typedef typename
Reloc_stub_map::const_iterator Reloc_stub_map_const_iter
;
1292 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
1294 typedef std::set
<The_erratum_stub
*, The_erratum_stub_less
> Erratum_stub_set
;
1295 typedef typename
Erratum_stub_set::iterator Erratum_stub_set_iter
;
1297 Stub_table(The_aarch64_input_section
* owner
)
1298 : Output_data(), owner_(owner
), reloc_stubs_size_(0),
1299 erratum_stubs_size_(0), prev_data_size_(0)
1305 The_aarch64_input_section
*
1309 // Whether this stub table is empty.
1312 { return reloc_stubs_
.empty() && erratum_stubs_
.empty(); }
1314 // Return the current data size.
1316 current_data_size() const
1317 { return this->current_data_size_for_child(); }
1319 // Add a STUB using KEY. The caller is responsible for avoiding addition
1320 // if a STUB with the same key has already been added.
1322 add_reloc_stub(The_reloc_stub
* stub
, const The_reloc_stub_key
& key
);
1324 // Add an erratum stub into the erratum stub set. The set is ordered by
1325 // (relobj, shndx, sh_offset).
1327 add_erratum_stub(The_erratum_stub
* stub
);
1329 // Find if such erratum exists for any given (obj, shndx, sh_offset).
1331 find_erratum_stub(The_aarch64_relobj
* a64relobj
,
1332 unsigned int shndx
, unsigned int sh_offset
);
1334 // Find all the erratums for a given input section. The return value is a pair
1335 // of iterators [begin, end).
1336 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1337 find_erratum_stubs_for_input_section(The_aarch64_relobj
* a64relobj
,
1338 unsigned int shndx
);
1340 // Compute the erratum stub address.
1342 erratum_stub_address(The_erratum_stub
* stub
) const
1344 AArch64_address r
= align_address(this->address() + this->reloc_stubs_size_
,
1345 The_erratum_stub::STUB_ADDR_ALIGN
);
1346 r
+= stub
->offset();
1350 // Finalize stubs. No-op here, just for completeness.
1355 // Look up a relocation stub using KEY. Return NULL if there is none.
1357 find_reloc_stub(The_reloc_stub_key
& key
)
1359 Reloc_stub_map_const_iter p
= this->reloc_stubs_
.find(key
);
1360 return (p
!= this->reloc_stubs_
.end()) ? p
->second
: NULL
;
1363 // Relocate stubs in this stub table.
1365 relocate_stubs(const The_relocate_info
*,
1366 The_target_aarch64
*,
1372 // Update data size at the end of a relaxation pass. Return true if data size
1373 // is different from that of the previous relaxation pass.
1375 update_data_size_changed_p()
1377 // No addralign changed here.
1378 off_t s
= align_address(this->reloc_stubs_size_
,
1379 The_erratum_stub::STUB_ADDR_ALIGN
)
1380 + this->erratum_stubs_size_
;
1381 bool changed
= (s
!= this->prev_data_size_
);
1382 this->prev_data_size_
= s
;
1387 // Write out section contents.
1389 do_write(Output_file
*);
1391 // Return the required alignment.
1393 do_addralign() const
1395 return std::max(The_reloc_stub::STUB_ADDR_ALIGN
,
1396 The_erratum_stub::STUB_ADDR_ALIGN
);
1399 // Reset address and file offset.
1401 do_reset_address_and_file_offset()
1402 { this->set_current_data_size_for_child(this->prev_data_size_
); }
1404 // Set final data size.
1406 set_final_data_size()
1407 { this->set_data_size(this->current_data_size()); }
1410 // Relocate one stub.
1412 relocate_stub(The_reloc_stub
*,
1413 const The_relocate_info
*,
1414 The_target_aarch64
*,
1421 // Owner of this stub table.
1422 The_aarch64_input_section
* owner_
;
1423 // The relocation stubs.
1424 Reloc_stub_map reloc_stubs_
;
1425 // The erratum stubs.
1426 Erratum_stub_set erratum_stubs_
;
1427 // Size of reloc stubs.
1428 off_t reloc_stubs_size_
;
1429 // Size of erratum stubs.
1430 off_t erratum_stubs_size_
;
1431 // data size of this in the previous pass.
1432 off_t prev_data_size_
;
1433 }; // End of Stub_table
1436 // Add an erratum stub into the erratum stub set. The set is ordered by
1437 // (relobj, shndx, sh_offset).
1439 template<int size
, bool big_endian
>
1441 Stub_table
<size
, big_endian
>::add_erratum_stub(The_erratum_stub
* stub
)
1443 std::pair
<Erratum_stub_set_iter
, bool> ret
=
1444 this->erratum_stubs_
.insert(stub
);
1445 gold_assert(ret
.second
);
1446 this->erratum_stubs_size_
= align_address(
1447 this->erratum_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1448 stub
->set_offset(this->erratum_stubs_size_
);
1449 this->erratum_stubs_size_
+= stub
->stub_size();
1453 // Find if such erratum exists for given (obj, shndx, sh_offset).
1455 template<int size
, bool big_endian
>
1456 Erratum_stub
<size
, big_endian
>*
1457 Stub_table
<size
, big_endian
>::find_erratum_stub(
1458 The_aarch64_relobj
* a64relobj
, unsigned int shndx
, unsigned int sh_offset
)
1460 // A dummy object used as key to search in the set.
1461 The_erratum_stub
key(a64relobj
, ST_NONE
,
1463 Erratum_stub_set_iter i
= this->erratum_stubs_
.find(&key
);
1464 if (i
!= this->erratum_stubs_
.end())
1466 The_erratum_stub
* stub(*i
);
1467 gold_assert(stub
->erratum_insn() != 0);
1474 // Find all the errata for a given input section. The return value is a pair of
1475 // iterators [begin, end).
1477 template<int size
, bool big_endian
>
1478 std::pair
<typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
,
1479 typename Stub_table
<size
, big_endian
>::Erratum_stub_set_iter
>
1480 Stub_table
<size
, big_endian
>::find_erratum_stubs_for_input_section(
1481 The_aarch64_relobj
* a64relobj
, unsigned int shndx
)
1483 typedef std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
> Result_pair
;
1484 Erratum_stub_set_iter start
, end
;
1485 The_erratum_stub
low_key(a64relobj
, ST_NONE
, shndx
, 0);
1486 start
= this->erratum_stubs_
.lower_bound(&low_key
);
1487 if (start
== this->erratum_stubs_
.end())
1488 return Result_pair(this->erratum_stubs_
.end(),
1489 this->erratum_stubs_
.end());
1491 while (end
!= this->erratum_stubs_
.end() &&
1492 (*end
)->relobj() == a64relobj
&& (*end
)->shndx() == shndx
)
1494 return Result_pair(start
, end
);
1498 // Add a STUB using KEY. The caller is responsible for avoiding addition
1499 // if a STUB with the same key has already been added.
1501 template<int size
, bool big_endian
>
1503 Stub_table
<size
, big_endian
>::add_reloc_stub(
1504 The_reloc_stub
* stub
, const The_reloc_stub_key
& key
)
1506 gold_assert(stub
->type() == key
.type());
1507 this->reloc_stubs_
[key
] = stub
;
1509 // Assign stub offset early. We can do this because we never remove
1510 // reloc stubs and they are in the beginning of the stub table.
1511 this->reloc_stubs_size_
= align_address(this->reloc_stubs_size_
,
1512 The_reloc_stub::STUB_ADDR_ALIGN
);
1513 stub
->set_offset(this->reloc_stubs_size_
);
1514 this->reloc_stubs_size_
+= stub
->stub_size();
1518 // Relocate all stubs in this stub table.
1520 template<int size
, bool big_endian
>
1522 Stub_table
<size
, big_endian
>::
1523 relocate_stubs(const The_relocate_info
* relinfo
,
1524 The_target_aarch64
* target_aarch64
,
1525 Output_section
* output_section
,
1526 unsigned char* view
,
1527 AArch64_address address
,
1528 section_size_type view_size
)
1530 // "view_size" is the total size of the stub_table.
1531 gold_assert(address
== this->address() &&
1532 view_size
== static_cast<section_size_type
>(this->data_size()));
1533 for(Reloc_stub_map_const_iter p
= this->reloc_stubs_
.begin();
1534 p
!= this->reloc_stubs_
.end(); ++p
)
1535 relocate_stub(p
->second
, relinfo
, target_aarch64
, output_section
,
1536 view
, address
, view_size
);
1538 // Just for convenience.
1539 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
1541 // Now 'relocate' erratum stubs.
1542 for(Erratum_stub_set_iter i
= this->erratum_stubs_
.begin();
1543 i
!= this->erratum_stubs_
.end(); ++i
)
1545 AArch64_address stub_address
= this->erratum_stub_address(*i
);
1546 // The address of "b" in the stub that is to be "relocated".
1547 AArch64_address stub_b_insn_address
;
1548 // Branch offset that is to be filled in "b" insn.
1550 switch ((*i
)->type())
1554 // The 1st insn of the erratum could be a relocation spot,
1555 // in this case we need to fix it with
1556 // "(*i)->erratum_insn()".
1557 elfcpp::Swap
<32, big_endian
>::writeval(
1558 view
+ (stub_address
- this->address()),
1559 (*i
)->erratum_insn());
1560 // For the erratum, the 2nd insn is a b-insn to be patched
1562 stub_b_insn_address
= stub_address
+ 1 * BPI
;
1563 b_offset
= (*i
)->destination_address() - stub_b_insn_address
;
1564 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1565 view
+ (stub_b_insn_address
- this->address()),
1566 ((unsigned int)(b_offset
)) & 0xfffffff);
1576 // Relocate one stub. This is a helper for Stub_table::relocate_stubs().
1578 template<int size
, bool big_endian
>
1580 Stub_table
<size
, big_endian
>::
1581 relocate_stub(The_reloc_stub
* stub
,
1582 const The_relocate_info
* relinfo
,
1583 The_target_aarch64
* target_aarch64
,
1584 Output_section
* output_section
,
1585 unsigned char* view
,
1586 AArch64_address address
,
1587 section_size_type view_size
)
1589 // "offset" is the offset from the beginning of the stub_table.
1590 section_size_type offset
= stub
->offset();
1591 section_size_type stub_size
= stub
->stub_size();
1592 // "view_size" is the total size of the stub_table.
1593 gold_assert(offset
+ stub_size
<= view_size
);
1595 target_aarch64
->relocate_stub(stub
, relinfo
, output_section
,
1596 view
+ offset
, address
+ offset
, view_size
);
1600 // Write out the stubs to file.
1602 template<int size
, bool big_endian
>
1604 Stub_table
<size
, big_endian
>::do_write(Output_file
* of
)
1606 off_t offset
= this->offset();
1607 const section_size_type oview_size
=
1608 convert_to_section_size_type(this->data_size());
1609 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1611 // Write relocation stubs.
1612 for (typename
Reloc_stub_map::const_iterator p
= this->reloc_stubs_
.begin();
1613 p
!= this->reloc_stubs_
.end(); ++p
)
1615 The_reloc_stub
* stub
= p
->second
;
1616 AArch64_address address
= this->address() + stub
->offset();
1617 gold_assert(address
==
1618 align_address(address
, The_reloc_stub::STUB_ADDR_ALIGN
));
1619 stub
->write(oview
+ stub
->offset(), stub
->stub_size());
1622 // Write erratum stubs.
1623 unsigned int erratum_stub_start_offset
=
1624 align_address(this->reloc_stubs_size_
, The_erratum_stub::STUB_ADDR_ALIGN
);
1625 for (typename
Erratum_stub_set::iterator p
= this->erratum_stubs_
.begin();
1626 p
!= this->erratum_stubs_
.end(); ++p
)
1628 The_erratum_stub
* stub(*p
);
1629 stub
->write(oview
+ erratum_stub_start_offset
+ stub
->offset(),
1633 of
->write_output_view(this->offset(), oview_size
, oview
);
1637 // AArch64_relobj class.
1639 template<int size
, bool big_endian
>
1640 class AArch64_relobj
: public Sized_relobj_file
<size
, big_endian
>
1643 typedef AArch64_relobj
<size
, big_endian
> This
;
1644 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
1645 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
1646 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
1647 typedef Stub_table
<size
, big_endian
> The_stub_table
;
1648 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
1649 typedef typename
The_stub_table::Erratum_stub_set_iter Erratum_stub_set_iter
;
1650 typedef std::vector
<The_stub_table
*> Stub_table_list
;
1651 static const AArch64_address invalid_address
=
1652 static_cast<AArch64_address
>(-1);
1654 AArch64_relobj(const std::string
& name
, Input_file
* input_file
, off_t offset
,
1655 const typename
elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
1656 : Sized_relobj_file
<size
, big_endian
>(name
, input_file
, offset
, ehdr
),
1663 // Return the stub table of the SHNDX-th section if there is one.
1665 stub_table(unsigned int shndx
) const
1667 gold_assert(shndx
< this->stub_tables_
.size());
1668 return this->stub_tables_
[shndx
];
1671 // Set STUB_TABLE to be the stub_table of the SHNDX-th section.
1673 set_stub_table(unsigned int shndx
, The_stub_table
* stub_table
)
1675 gold_assert(shndx
< this->stub_tables_
.size());
1676 this->stub_tables_
[shndx
] = stub_table
;
1679 // Entrance to errata scanning.
1681 scan_errata(unsigned int shndx
,
1682 const elfcpp::Shdr
<size
, big_endian
>&,
1683 Output_section
*, const Symbol_table
*,
1684 The_target_aarch64
*);
1686 // Scan all relocation sections for stub generation.
1688 scan_sections_for_stubs(The_target_aarch64
*, const Symbol_table
*,
1691 // Whether a section is a scannable text section.
1693 text_section_is_scannable(const elfcpp::Shdr
<size
, big_endian
>&, unsigned int,
1694 const Output_section
*, const Symbol_table
*);
1696 // Convert regular input section with index SHNDX to a relaxed section.
1698 convert_input_section_to_relaxed_section(unsigned /* shndx */)
1700 // The stubs have relocations and we need to process them after writing
1701 // out the stubs. So relocation now must follow section write.
1702 this->set_relocs_must_follow_section_writes();
1705 // Structure for mapping symbol position.
1706 struct Mapping_symbol_position
1708 Mapping_symbol_position(unsigned int shndx
, AArch64_address offset
):
1709 shndx_(shndx
), offset_(offset
)
1712 // "<" comparator used in ordered_map container.
1714 operator<(const Mapping_symbol_position
& p
) const
1716 return (this->shndx_
< p
.shndx_
1717 || (this->shndx_
== p
.shndx_
&& this->offset_
< p
.offset_
));
1721 unsigned int shndx_
;
1724 AArch64_address offset_
;
1727 typedef std::map
<Mapping_symbol_position
, char> Mapping_symbol_info
;
1730 // Post constructor setup.
1734 // Call parent's setup method.
1735 Sized_relobj_file
<size
, big_endian
>::do_setup();
1737 // Initialize look-up tables.
1738 this->stub_tables_
.resize(this->shnum());
1742 do_relocate_sections(
1743 const Symbol_table
* symtab
, const Layout
* layout
,
1744 const unsigned char* pshdrs
, Output_file
* of
,
1745 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1747 // Count local symbols and (optionally) record mapping info.
1749 do_count_local_symbols(Stringpool_template
<char>*,
1750 Stringpool_template
<char>*);
1753 // Fix all errata in the object.
1755 fix_errata(typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
);
1757 // Whether a section needs to be scanned for relocation stubs.
1759 section_needs_reloc_stub_scanning(const elfcpp::Shdr
<size
, big_endian
>&,
1760 const Relobj::Output_sections
&,
1761 const Symbol_table
*, const unsigned char*);
1763 // List of stub tables.
1764 Stub_table_list stub_tables_
;
1766 // Mapping symbol information sorted by (section index, section_offset).
1767 Mapping_symbol_info mapping_symbol_info_
;
1768 }; // End of AArch64_relobj
1771 // Override to record mapping symbol information.
1772 template<int size
, bool big_endian
>
1774 AArch64_relobj
<size
, big_endian
>::do_count_local_symbols(
1775 Stringpool_template
<char>* pool
, Stringpool_template
<char>* dynpool
)
1777 Sized_relobj_file
<size
, big_endian
>::do_count_local_symbols(pool
, dynpool
);
1779 // Only erratum-fixing work needs mapping symbols, so skip this time consuming
1780 // processing if not fixing erratum.
1781 if (!parameters
->options().fix_cortex_a53_843419()
1782 && !parameters
->options().fix_cortex_a53_835769())
1785 const unsigned int loccount
= this->local_symbol_count();
1789 // Read the symbol table section header.
1790 const unsigned int symtab_shndx
= this->symtab_shndx();
1791 elfcpp::Shdr
<size
, big_endian
>
1792 symtabshdr(this, this->elf_file()->section_header(symtab_shndx
));
1793 gold_assert(symtabshdr
.get_sh_type() == elfcpp::SHT_SYMTAB
);
1795 // Read the local symbols.
1796 const int sym_size
=elfcpp::Elf_sizes
<size
>::sym_size
;
1797 gold_assert(loccount
== symtabshdr
.get_sh_info());
1798 off_t locsize
= loccount
* sym_size
;
1799 const unsigned char* psyms
= this->get_view(symtabshdr
.get_sh_offset(),
1800 locsize
, true, true);
1802 // For mapping symbol processing, we need to read the symbol names.
1803 unsigned int strtab_shndx
= this->adjust_shndx(symtabshdr
.get_sh_link());
1804 if (strtab_shndx
>= this->shnum())
1806 this->error(_("invalid symbol table name index: %u"), strtab_shndx
);
1810 elfcpp::Shdr
<size
, big_endian
>
1811 strtabshdr(this, this->elf_file()->section_header(strtab_shndx
));
1812 if (strtabshdr
.get_sh_type() != elfcpp::SHT_STRTAB
)
1814 this->error(_("symbol table name section has wrong type: %u"),
1815 static_cast<unsigned int>(strtabshdr
.get_sh_type()));
1819 const char* pnames
=
1820 reinterpret_cast<const char*>(this->get_view(strtabshdr
.get_sh_offset(),
1821 strtabshdr
.get_sh_size(),
1824 // Skip the first dummy symbol.
1826 typename Sized_relobj_file
<size
, big_endian
>::Local_values
*
1827 plocal_values
= this->local_values();
1828 for (unsigned int i
= 1; i
< loccount
; ++i
, psyms
+= sym_size
)
1830 elfcpp::Sym
<size
, big_endian
> sym(psyms
);
1831 Symbol_value
<size
>& lv((*plocal_values
)[i
]);
1832 AArch64_address input_value
= lv
.input_value();
1834 // Check to see if this is a mapping symbol. AArch64 mapping symbols are
1835 // defined in "ELF for the ARM 64-bit Architecture", Table 4-4, Mapping
1837 // Mapping symbols could be one of the following 4 forms -
1842 const char* sym_name
= pnames
+ sym
.get_st_name();
1843 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1844 && (sym_name
[2] == '\0' || sym_name
[2] == '.'))
1847 unsigned int input_shndx
=
1848 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1849 gold_assert(is_ordinary
);
1851 Mapping_symbol_position
msp(input_shndx
, input_value
);
1852 // Insert mapping_symbol_info into map whose ordering is defined by
1853 // (shndx, offset_within_section).
1854 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1860 // Fix all errata in the object.
1862 template<int size
, bool big_endian
>
1864 AArch64_relobj
<size
, big_endian
>::fix_errata(
1865 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1867 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1868 unsigned int shnum
= this->shnum();
1869 for (unsigned int i
= 1; i
< shnum
; ++i
)
1871 The_stub_table
* stub_table
= this->stub_table(i
);
1874 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1875 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
1876 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
1879 The_erratum_stub
* stub
= *p
;
1880 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1881 pview((*pviews
)[i
]);
1883 // Double check data before fix.
1884 gold_assert(pview
.address
+ stub
->sh_offset()
1885 == stub
->erratum_address());
1887 // Update previously recorded erratum insn with relocated
1890 reinterpret_cast<Insntype
*>(pview
.view
+ stub
->sh_offset());
1891 Insntype insn_to_fix
= ip
[0];
1892 stub
->update_erratum_insn(insn_to_fix
);
1894 // Replace the erratum insn with a branch-to-stub.
1895 AArch64_address stub_address
=
1896 stub_table
->erratum_stub_address(stub
);
1897 unsigned int b_offset
= stub_address
- stub
->erratum_address();
1898 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1899 pview
.view
+ stub
->sh_offset(), b_offset
& 0xfffffff);
1906 // Relocate sections.
1908 template<int size
, bool big_endian
>
1910 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
1911 const Symbol_table
* symtab
, const Layout
* layout
,
1912 const unsigned char* pshdrs
, Output_file
* of
,
1913 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1915 // Call parent to relocate sections.
1916 Sized_relobj_file
<size
, big_endian
>::do_relocate_sections(symtab
, layout
,
1917 pshdrs
, of
, pviews
);
1919 // We do not generate stubs if doing a relocatable link.
1920 if (parameters
->options().relocatable())
1923 if (parameters
->options().fix_cortex_a53_843419()
1924 || parameters
->options().fix_cortex_a53_835769())
1925 this->fix_errata(pviews
);
1927 Relocate_info
<size
, big_endian
> relinfo
;
1928 relinfo
.symtab
= symtab
;
1929 relinfo
.layout
= layout
;
1930 relinfo
.object
= this;
1932 // Relocate stub tables.
1933 unsigned int shnum
= this->shnum();
1934 The_target_aarch64
* target
= The_target_aarch64::current_target();
1936 for (unsigned int i
= 1; i
< shnum
; ++i
)
1938 The_aarch64_input_section
* aarch64_input_section
=
1939 target
->find_aarch64_input_section(this, i
);
1940 if (aarch64_input_section
!= NULL
1941 && aarch64_input_section
->is_stub_table_owner()
1942 && !aarch64_input_section
->stub_table()->empty())
1944 Output_section
* os
= this->output_section(i
);
1945 gold_assert(os
!= NULL
);
1947 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
1948 relinfo
.reloc_shdr
= NULL
;
1949 relinfo
.data_shndx
= i
;
1950 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
1952 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1953 view_struct
= (*pviews
)[i
];
1954 gold_assert(view_struct
.view
!= NULL
);
1956 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
1957 off_t offset
= stub_table
->address() - view_struct
.address
;
1958 unsigned char* view
= view_struct
.view
+ offset
;
1959 AArch64_address address
= stub_table
->address();
1960 section_size_type view_size
= stub_table
->data_size();
1961 stub_table
->relocate_stubs(&relinfo
, target
, os
, view
, address
,
1968 // Determine if an input section is scannable for stub processing. SHDR is
1969 // the header of the section and SHNDX is the section index. OS is the output
1970 // section for the input section and SYMTAB is the global symbol table used to
1971 // look up ICF information.
1973 template<int size
, bool big_endian
>
1975 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
1976 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
1977 unsigned int text_shndx
,
1978 const Output_section
* os
,
1979 const Symbol_table
* symtab
)
1981 // Skip any empty sections, unallocated sections or sections whose
1982 // type are not SHT_PROGBITS.
1983 if (text_shdr
.get_sh_size() == 0
1984 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
1985 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
1988 // Skip any discarded or ICF'ed sections.
1989 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
1992 // Skip exception frame.
1993 if (strcmp(os
->name(), ".eh_frame") == 0)
1996 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
1997 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
2003 // Determine if we want to scan the SHNDX-th section for relocation stubs.
2004 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
2006 template<int size
, bool big_endian
>
2008 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2009 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2010 const Relobj::Output_sections
& out_sections
,
2011 const Symbol_table
* symtab
,
2012 const unsigned char* pshdrs
)
2014 unsigned int sh_type
= shdr
.get_sh_type();
2015 if (sh_type
!= elfcpp::SHT_RELA
)
2018 // Ignore empty section.
2019 off_t sh_size
= shdr
.get_sh_size();
2023 // Ignore reloc section with unexpected symbol table. The
2024 // error will be reported in the final link.
2025 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2028 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2029 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2031 // Ignore reloc section with unexpected entsize or uneven size.
2032 // The error will be reported in the final link.
2033 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2036 // Ignore reloc section with bad info. This error will be
2037 // reported in the final link.
2038 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2039 if (text_shndx
>= this->shnum())
2042 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2043 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2044 text_shndx
* shdr_size
);
2045 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2046 out_sections
[text_shndx
], symtab
);
2050 // Scan section SHNDX for erratum 843419 and 835769.
2052 template<int size
, bool big_endian
>
2054 AArch64_relobj
<size
, big_endian
>::scan_errata(
2055 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2056 Output_section
* os
, const Symbol_table
* symtab
,
2057 The_target_aarch64
* target
)
2059 if (shdr
.get_sh_size() == 0
2060 || (shdr
.get_sh_flags() &
2061 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2062 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2065 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2067 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2068 AArch64_address output_address
;
2069 if (output_offset
!= invalid_address
)
2070 output_address
= os
->address() + output_offset
;
2073 const Output_relaxed_input_section
* poris
=
2074 os
->find_relaxed_input_section(this, shndx
);
2076 output_address
= poris
->address();
2079 section_size_type input_view_size
= 0;
2080 const unsigned char* input_view
=
2081 this->section_contents(shndx
, &input_view_size
, false);
2083 Mapping_symbol_position
section_start(shndx
, 0);
2084 // Find the first mapping symbol record within section shndx.
2085 typename
Mapping_symbol_info::const_iterator p
=
2086 this->mapping_symbol_info_
.lower_bound(section_start
);
2087 if (p
== this->mapping_symbol_info_
.end() || p
->first
.shndx_
!= shndx
)
2088 gold_warning(_("cannot scan executable section %u of %s for Cortex-A53 "
2089 "erratum because it has no mapping symbols."),
2090 shndx
, this->name().c_str());
2091 while (p
!= this->mapping_symbol_info_
.end() &&
2092 p
->first
.shndx_
== shndx
)
2094 typename
Mapping_symbol_info::const_iterator prev
= p
;
2096 if (prev
->second
== 'x')
2098 section_size_type span_start
=
2099 convert_to_section_size_type(prev
->first
.offset_
);
2100 section_size_type span_end
;
2101 if (p
!= this->mapping_symbol_info_
.end()
2102 && p
->first
.shndx_
== shndx
)
2103 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2105 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2107 // Here we do not share the scanning code of both errata. For 843419,
2108 // only the last few insns of each page are examined, which is fast,
2109 // whereas, for 835769, every insn pair needs to be checked.
2111 if (parameters
->options().fix_cortex_a53_843419())
2112 target
->scan_erratum_843419_span(
2113 this, shndx
, span_start
, span_end
,
2114 const_cast<unsigned char*>(input_view
), output_address
);
2116 if (parameters
->options().fix_cortex_a53_835769())
2117 target
->scan_erratum_835769_span(
2118 this, shndx
, span_start
, span_end
,
2119 const_cast<unsigned char*>(input_view
), output_address
);
2125 // Scan relocations for stub generation.
2127 template<int size
, bool big_endian
>
2129 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2130 The_target_aarch64
* target
,
2131 const Symbol_table
* symtab
,
2132 const Layout
* layout
)
2134 unsigned int shnum
= this->shnum();
2135 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2137 // Read the section headers.
2138 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2142 // To speed up processing, we set up hash tables for fast lookup of
2143 // input offsets to output addresses.
2144 this->initialize_input_to_output_maps();
2146 const Relobj::Output_sections
& out_sections(this->output_sections());
2148 Relocate_info
<size
, big_endian
> relinfo
;
2149 relinfo
.symtab
= symtab
;
2150 relinfo
.layout
= layout
;
2151 relinfo
.object
= this;
2153 // Do relocation stubs scanning.
2154 const unsigned char* p
= pshdrs
+ shdr_size
;
2155 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2157 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2158 if (parameters
->options().fix_cortex_a53_843419()
2159 || parameters
->options().fix_cortex_a53_835769())
2160 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2161 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2164 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2165 AArch64_address output_offset
=
2166 this->get_output_section_offset(index
);
2167 AArch64_address output_address
;
2168 if (output_offset
!= invalid_address
)
2170 output_address
= out_sections
[index
]->address() + output_offset
;
2174 // Currently this only happens for a relaxed section.
2175 const Output_relaxed_input_section
* poris
=
2176 out_sections
[index
]->find_relaxed_input_section(this, index
);
2177 gold_assert(poris
!= NULL
);
2178 output_address
= poris
->address();
2181 // Get the relocations.
2182 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2186 // Get the section contents.
2187 section_size_type input_view_size
= 0;
2188 const unsigned char* input_view
=
2189 this->section_contents(index
, &input_view_size
, false);
2191 relinfo
.reloc_shndx
= i
;
2192 relinfo
.data_shndx
= index
;
2193 unsigned int sh_type
= shdr
.get_sh_type();
2194 unsigned int reloc_size
;
2195 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2196 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2198 Output_section
* os
= out_sections
[index
];
2199 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2200 shdr
.get_sh_size() / reloc_size
,
2202 output_offset
== invalid_address
,
2203 input_view
, output_address
,
2210 // A class to wrap an ordinary input section containing executable code.
2212 template<int size
, bool big_endian
>
2213 class AArch64_input_section
: public Output_relaxed_input_section
2216 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2218 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2219 : Output_relaxed_input_section(relobj
, shndx
, 1),
2221 original_contents_(NULL
), original_size_(0),
2222 original_addralign_(1)
2225 ~AArch64_input_section()
2226 { delete[] this->original_contents_
; }
2232 // Set the stub_table.
2234 set_stub_table(The_stub_table
* st
)
2235 { this->stub_table_
= st
; }
2237 // Whether this is a stub table owner.
2239 is_stub_table_owner() const
2240 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2242 // Return the original size of the section.
2244 original_size() const
2245 { return this->original_size_
; }
2247 // Return the stub table.
2250 { return stub_table_
; }
2253 // Write out this input section.
2255 do_write(Output_file
*);
2257 // Return required alignment of this.
2259 do_addralign() const
2261 if (this->is_stub_table_owner())
2262 return std::max(this->stub_table_
->addralign(),
2263 static_cast<uint64_t>(this->original_addralign_
));
2265 return this->original_addralign_
;
2268 // Finalize data size.
2270 set_final_data_size();
2272 // Reset address and file offset.
2274 do_reset_address_and_file_offset();
2278 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2279 section_offset_type offset
,
2280 section_offset_type
* poutput
) const
2282 if ((object
== this->relobj())
2283 && (shndx
== this->shndx())
2286 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2296 // Copying is not allowed.
2297 AArch64_input_section(const AArch64_input_section
&);
2298 AArch64_input_section
& operator=(const AArch64_input_section
&);
2300 // The relocation stubs.
2301 The_stub_table
* stub_table_
;
2302 // Original section contents. We have to make a copy here since the file
2303 // containing the original section may not be locked when we need to access
2305 unsigned char* original_contents_
;
2306 // Section size of the original input section.
2307 uint32_t original_size_
;
2308 // Address alignment of the original input section.
2309 uint32_t original_addralign_
;
2310 }; // End of AArch64_input_section
2313 // Finalize data size.
2315 template<int size
, bool big_endian
>
2317 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2319 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2321 if (this->is_stub_table_owner())
2323 this->stub_table_
->finalize_data_size();
2324 off
= align_address(off
, this->stub_table_
->addralign());
2325 off
+= this->stub_table_
->data_size();
2327 this->set_data_size(off
);
2331 // Reset address and file offset.
2333 template<int size
, bool big_endian
>
2335 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2337 // Size of the original input section contents.
2338 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2340 // If this is a stub table owner, account for the stub table size.
2341 if (this->is_stub_table_owner())
2343 The_stub_table
* stub_table
= this->stub_table_
;
2345 // Reset the stub table's address and file offset. The
2346 // current data size for child will be updated after that.
2347 stub_table_
->reset_address_and_file_offset();
2348 off
= align_address(off
, stub_table_
->addralign());
2349 off
+= stub_table
->current_data_size();
2352 this->set_current_data_size(off
);
2356 // Initialize an Arm_input_section.
2358 template<int size
, bool big_endian
>
2360 AArch64_input_section
<size
, big_endian
>::init()
2362 Relobj
* relobj
= this->relobj();
2363 unsigned int shndx
= this->shndx();
2365 // We have to cache original size, alignment and contents to avoid locking
2366 // the original file.
2367 this->original_addralign_
=
2368 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2370 // This is not efficient but we expect only a small number of relaxed
2371 // input sections for stubs.
2372 section_size_type section_size
;
2373 const unsigned char* section_contents
=
2374 relobj
->section_contents(shndx
, §ion_size
, false);
2375 this->original_size_
=
2376 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2378 gold_assert(this->original_contents_
== NULL
);
2379 this->original_contents_
= new unsigned char[section_size
];
2380 memcpy(this->original_contents_
, section_contents
, section_size
);
2382 // We want to make this look like the original input section after
2383 // output sections are finalized.
2384 Output_section
* os
= relobj
->output_section(shndx
);
2385 off_t offset
= relobj
->output_section_offset(shndx
);
2386 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2387 this->set_address(os
->address() + offset
);
2388 this->set_file_offset(os
->offset() + offset
);
2389 this->set_current_data_size(this->original_size_
);
2390 this->finalize_data_size();
2394 // Write data to output file.
2396 template<int size
, bool big_endian
>
2398 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2400 // We have to write out the original section content.
2401 gold_assert(this->original_contents_
!= NULL
);
2402 of
->write(this->offset(), this->original_contents_
,
2403 this->original_size_
);
2405 // If this owns a stub table and it is not empty, write it.
2406 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2407 this->stub_table_
->write(of
);
2411 // Arm output section class. This is defined mainly to add a number of stub
2412 // generation methods.
2414 template<int size
, bool big_endian
>
2415 class AArch64_output_section
: public Output_section
2418 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2419 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2420 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2421 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2424 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2425 elfcpp::Elf_Xword flags
)
2426 : Output_section(name
, type
, flags
)
2429 ~AArch64_output_section() {}
2431 // Group input sections for stub generation.
2433 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2437 typedef Output_section::Input_section Input_section
;
2438 typedef Output_section::Input_section_list Input_section_list
;
2440 // Create a stub group.
2442 create_stub_group(Input_section_list::const_iterator
,
2443 Input_section_list::const_iterator
,
2444 Input_section_list::const_iterator
,
2445 The_target_aarch64
*,
2446 std::vector
<Output_relaxed_input_section
*>&,
2448 }; // End of AArch64_output_section
2451 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2452 // the input section that will be the owner of the stub table.
2454 template<int size
, bool big_endian
> void
2455 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2456 Input_section_list::const_iterator first
,
2457 Input_section_list::const_iterator last
,
2458 Input_section_list::const_iterator owner
,
2459 The_target_aarch64
* target
,
2460 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2463 // Currently we convert ordinary input sections into relaxed sections only
2465 The_aarch64_input_section
* input_section
;
2466 if (owner
->is_relaxed_input_section())
2470 gold_assert(owner
->is_input_section());
2471 // Create a new relaxed input section. We need to lock the original
2473 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2475 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2476 new_relaxed_sections
.push_back(input_section
);
2479 // Create a stub table.
2480 The_stub_table
* stub_table
=
2481 target
->new_stub_table(input_section
);
2483 input_section
->set_stub_table(stub_table
);
2485 Input_section_list::const_iterator p
= first
;
2486 // Look for input sections or relaxed input sections in [first ... last].
2489 if (p
->is_input_section() || p
->is_relaxed_input_section())
2491 // The stub table information for input sections live
2492 // in their objects.
2493 The_aarch64_relobj
* aarch64_relobj
=
2494 static_cast<The_aarch64_relobj
*>(p
->relobj());
2495 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2498 while (p
++ != last
);
2502 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2503 // stub groups. We grow a stub group by adding input section until the size is
2504 // just below GROUP_SIZE. The last input section will be converted into a stub
2505 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2506 // after the stub table, effectively doubling the group size.
2508 // This is similar to the group_sections() function in elf32-arm.c but is
2509 // implemented differently.
2511 template<int size
, bool big_endian
>
2512 void AArch64_output_section
<size
, big_endian
>::group_sections(
2513 section_size_type group_size
,
2514 bool stubs_always_after_branch
,
2515 Target_aarch64
<size
, big_endian
>* target
,
2521 FINDING_STUB_SECTION
,
2525 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2527 State state
= NO_GROUP
;
2528 section_size_type off
= 0;
2529 section_size_type group_begin_offset
= 0;
2530 section_size_type group_end_offset
= 0;
2531 section_size_type stub_table_end_offset
= 0;
2532 Input_section_list::const_iterator group_begin
=
2533 this->input_sections().end();
2534 Input_section_list::const_iterator stub_table
=
2535 this->input_sections().end();
2536 Input_section_list::const_iterator group_end
= this->input_sections().end();
2537 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2538 p
!= this->input_sections().end();
2541 section_size_type section_begin_offset
=
2542 align_address(off
, p
->addralign());
2543 section_size_type section_end_offset
=
2544 section_begin_offset
+ p
->data_size();
2546 // Check to see if we should group the previously seen sections.
2552 case FINDING_STUB_SECTION
:
2553 // Adding this section makes the group larger than GROUP_SIZE.
2554 if (section_end_offset
- group_begin_offset
>= group_size
)
2556 if (stubs_always_after_branch
)
2558 gold_assert(group_end
!= this->input_sections().end());
2559 this->create_stub_group(group_begin
, group_end
, group_end
,
2560 target
, new_relaxed_sections
,
2566 // Input sections up to stub_group_size bytes after the stub
2567 // table can be handled by it too.
2568 state
= HAS_STUB_SECTION
;
2569 stub_table
= group_end
;
2570 stub_table_end_offset
= group_end_offset
;
2575 case HAS_STUB_SECTION
:
2576 // Adding this section makes the post stub-section group larger
2579 // NOT SUPPORTED YET. For completeness only.
2580 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2582 gold_assert(group_end
!= this->input_sections().end());
2583 this->create_stub_group(group_begin
, group_end
, stub_table
,
2584 target
, new_relaxed_sections
, task
);
2593 // If we see an input section and currently there is no group, start
2594 // a new one. Skip any empty sections. We look at the data size
2595 // instead of calling p->relobj()->section_size() to avoid locking.
2596 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2597 && (p
->data_size() != 0))
2599 if (state
== NO_GROUP
)
2601 state
= FINDING_STUB_SECTION
;
2603 group_begin_offset
= section_begin_offset
;
2606 // Keep track of the last input section seen.
2608 group_end_offset
= section_end_offset
;
2611 off
= section_end_offset
;
2614 // Create a stub group for any ungrouped sections.
2615 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2617 gold_assert(group_end
!= this->input_sections().end());
2618 this->create_stub_group(group_begin
, group_end
,
2619 (state
== FINDING_STUB_SECTION
2622 target
, new_relaxed_sections
, task
);
2625 if (!new_relaxed_sections
.empty())
2626 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2628 // Update the section offsets
2629 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2631 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2632 new_relaxed_sections
[i
]->relobj());
2633 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2634 // Tell AArch64_relobj that this input section is converted.
2635 relobj
->convert_input_section_to_relaxed_section(shndx
);
2637 } // End of AArch64_output_section::group_sections
2640 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2643 // The aarch64 target class.
2645 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2646 template<int size
, bool big_endian
>
2647 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2650 typedef Target_aarch64
<size
, big_endian
> This
;
2651 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2653 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2654 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2655 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2656 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2657 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2658 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2659 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2660 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2661 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2662 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2663 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2664 typedef Unordered_map
<Section_id
,
2665 AArch64_input_section
<size
, big_endian
>*,
2666 Section_id_hash
> AArch64_input_section_map
;
2667 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2668 const static int TCB_SIZE
= size
/ 8 * 2;
2670 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2671 : Sized_target
<size
, big_endian
>(info
),
2672 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2673 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2674 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2675 got_mod_index_offset_(-1U),
2676 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2677 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2680 // Scan the relocations to determine unreferenced sections for
2681 // garbage collection.
2683 gc_process_relocs(Symbol_table
* symtab
,
2685 Sized_relobj_file
<size
, big_endian
>* object
,
2686 unsigned int data_shndx
,
2687 unsigned int sh_type
,
2688 const unsigned char* prelocs
,
2690 Output_section
* output_section
,
2691 bool needs_special_offset_handling
,
2692 size_t local_symbol_count
,
2693 const unsigned char* plocal_symbols
);
2695 // Scan the relocations to look for symbol adjustments.
2697 scan_relocs(Symbol_table
* symtab
,
2699 Sized_relobj_file
<size
, big_endian
>* object
,
2700 unsigned int data_shndx
,
2701 unsigned int sh_type
,
2702 const unsigned char* prelocs
,
2704 Output_section
* output_section
,
2705 bool needs_special_offset_handling
,
2706 size_t local_symbol_count
,
2707 const unsigned char* plocal_symbols
);
2709 // Finalize the sections.
2711 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2713 // Return the value to use for a dynamic which requires special
2716 do_dynsym_value(const Symbol
*) const;
2718 // Relocate a section.
2720 relocate_section(const Relocate_info
<size
, big_endian
>*,
2721 unsigned int sh_type
,
2722 const unsigned char* prelocs
,
2724 Output_section
* output_section
,
2725 bool needs_special_offset_handling
,
2726 unsigned char* view
,
2727 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2728 section_size_type view_size
,
2729 const Reloc_symbol_changes
*);
2731 // Scan the relocs during a relocatable link.
2733 scan_relocatable_relocs(Symbol_table
* symtab
,
2735 Sized_relobj_file
<size
, big_endian
>* object
,
2736 unsigned int data_shndx
,
2737 unsigned int sh_type
,
2738 const unsigned char* prelocs
,
2740 Output_section
* output_section
,
2741 bool needs_special_offset_handling
,
2742 size_t local_symbol_count
,
2743 const unsigned char* plocal_symbols
,
2744 Relocatable_relocs
*);
2746 // Relocate a section during a relocatable link.
2749 const Relocate_info
<size
, big_endian
>*,
2750 unsigned int sh_type
,
2751 const unsigned char* prelocs
,
2753 Output_section
* output_section
,
2754 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
2755 const Relocatable_relocs
*,
2756 unsigned char* view
,
2757 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2758 section_size_type view_size
,
2759 unsigned char* reloc_view
,
2760 section_size_type reloc_view_size
);
2762 // Return the symbol index to use for a target specific relocation.
2763 // The only target specific relocation is R_AARCH64_TLSDESC for a
2764 // local symbol, which is an absolute reloc.
2766 do_reloc_symbol_index(void*, unsigned int r_type
) const
2768 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
2772 // Return the addend to use for a target specific relocation.
2774 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
2776 // Return the PLT section.
2778 do_plt_address_for_global(const Symbol
* gsym
) const
2779 { return this->plt_section()->address_for_global(gsym
); }
2782 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
2783 { return this->plt_section()->address_for_local(relobj
, symndx
); }
2785 // This function should be defined in targets that can use relocation
2786 // types to determine (implemented in local_reloc_may_be_function_pointer
2787 // and global_reloc_may_be_function_pointer)
2788 // if a function's pointer is taken. ICF uses this in safe mode to only
2789 // fold those functions whose pointer is defintely not taken.
2791 do_can_check_for_function_pointers() const
2794 // Return the number of entries in the PLT.
2796 plt_entry_count() const;
2798 //Return the offset of the first non-reserved PLT entry.
2800 first_plt_entry_offset() const;
2802 // Return the size of each PLT entry.
2804 plt_entry_size() const;
2806 // Create a stub table.
2808 new_stub_table(The_aarch64_input_section
*);
2810 // Create an aarch64 input section.
2811 The_aarch64_input_section
*
2812 new_aarch64_input_section(Relobj
*, unsigned int);
2814 // Find an aarch64 input section instance for a given OBJ and SHNDX.
2815 The_aarch64_input_section
*
2816 find_aarch64_input_section(Relobj
*, unsigned int) const;
2818 // Return the thread control block size.
2820 tcb_size() const { return This::TCB_SIZE
; }
2822 // Scan a section for stub generation.
2824 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
2825 const unsigned char*, size_t, Output_section
*,
2826 bool, const unsigned char*,
2830 // Scan a relocation section for stub.
2831 template<int sh_type
>
2833 scan_reloc_section_for_stubs(
2834 const The_relocate_info
* relinfo
,
2835 const unsigned char* prelocs
,
2837 Output_section
* output_section
,
2838 bool needs_special_offset_handling
,
2839 const unsigned char* view
,
2840 Address view_address
,
2843 // Relocate a single stub.
2845 relocate_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
2846 Output_section
*, unsigned char*, Address
,
2849 // Get the default AArch64 target.
2853 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
2854 && parameters
->target().get_size() == size
2855 && parameters
->target().is_big_endian() == big_endian
);
2856 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
2860 // Scan erratum 843419 for a part of a section.
2862 scan_erratum_843419_span(
2863 AArch64_relobj
<size
, big_endian
>*,
2865 const section_size_type
,
2866 const section_size_type
,
2870 // Scan erratum 835769 for a part of a section.
2872 scan_erratum_835769_span(
2873 AArch64_relobj
<size
, big_endian
>*,
2875 const section_size_type
,
2876 const section_size_type
,
2882 do_select_as_default_target()
2884 gold_assert(aarch64_reloc_property_table
== NULL
);
2885 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
2888 // Add a new reloc argument, returning the index in the vector.
2890 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
2893 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
2894 return this->tlsdesc_reloc_info_
.size() - 1;
2897 virtual Output_data_plt_aarch64
<size
, big_endian
>*
2898 do_make_data_plt(Layout
* layout
,
2899 Output_data_got_aarch64
<size
, big_endian
>* got
,
2900 Output_data_space
* got_plt
,
2901 Output_data_space
* got_irelative
)
2903 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
2904 layout
, got
, got_plt
, got_irelative
);
2908 // do_make_elf_object to override the same function in the base class.
2910 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
2911 const elfcpp::Ehdr
<size
, big_endian
>&);
2913 Output_data_plt_aarch64
<size
, big_endian
>*
2914 make_data_plt(Layout
* layout
,
2915 Output_data_got_aarch64
<size
, big_endian
>* got
,
2916 Output_data_space
* got_plt
,
2917 Output_data_space
* got_irelative
)
2919 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
2922 // We only need to generate stubs, and hence perform relaxation if we are
2923 // not doing relocatable linking.
2925 do_may_relax() const
2926 { return !parameters
->options().relocatable(); }
2928 // Relaxation hook. This is where we do stub generation.
2930 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
2933 group_sections(Layout
* layout
,
2934 section_size_type group_size
,
2935 bool stubs_always_after_branch
,
2939 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
2940 const Sized_symbol
<size
>*, unsigned int,
2941 const Symbol_value
<size
>*,
2942 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
2945 // Make an output section.
2947 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
2948 elfcpp::Elf_Xword flags
)
2949 { return new The_aarch64_output_section(name
, type
, flags
); }
2952 // The class which scans relocations.
2957 : issued_non_pic_error_(false)
2961 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
2962 Sized_relobj_file
<size
, big_endian
>* object
,
2963 unsigned int data_shndx
,
2964 Output_section
* output_section
,
2965 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
2966 const elfcpp::Sym
<size
, big_endian
>& lsym
,
2970 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
2971 Sized_relobj_file
<size
, big_endian
>* object
,
2972 unsigned int data_shndx
,
2973 Output_section
* output_section
,
2974 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
2978 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
2979 Target_aarch64
<size
, big_endian
>* ,
2980 Sized_relobj_file
<size
, big_endian
>* ,
2983 const elfcpp::Rela
<size
, big_endian
>& ,
2984 unsigned int r_type
,
2985 const elfcpp::Sym
<size
, big_endian
>&);
2988 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
2989 Target_aarch64
<size
, big_endian
>* ,
2990 Sized_relobj_file
<size
, big_endian
>* ,
2993 const elfcpp::Rela
<size
, big_endian
>& ,
2994 unsigned int r_type
,
2999 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
3000 unsigned int r_type
);
3003 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
3004 unsigned int r_type
, Symbol
*);
3007 possible_function_pointer_reloc(unsigned int r_type
);
3010 check_non_pic(Relobj
*, unsigned int r_type
);
3013 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3014 unsigned int r_type
);
3016 // Whether we have issued an error about a non-PIC compilation.
3017 bool issued_non_pic_error_
;
3020 // The class which implements relocation.
3025 : skip_call_tls_get_addr_(false)
3031 // Do a relocation. Return false if the caller should not issue
3032 // any warnings about this relocation.
3034 relocate(const Relocate_info
<size
, big_endian
>*, Target_aarch64
*,
3036 size_t relnum
, const elfcpp::Rela
<size
, big_endian
>&,
3037 unsigned int r_type
, const Sized_symbol
<size
>*,
3038 const Symbol_value
<size
>*,
3039 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3043 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3044 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3045 Target_aarch64
<size
, big_endian
>*,
3047 const elfcpp::Rela
<size
, big_endian
>&,
3048 unsigned int r_type
, const Sized_symbol
<size
>*,
3049 const Symbol_value
<size
>*,
3051 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3053 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3055 const Relocate_info
<size
, big_endian
>*,
3056 Target_aarch64
<size
, big_endian
>*,
3057 const elfcpp::Rela
<size
, big_endian
>&,
3060 const Symbol_value
<size
>*);
3062 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3064 const Relocate_info
<size
, big_endian
>*,
3065 Target_aarch64
<size
, big_endian
>*,
3066 const elfcpp::Rela
<size
, big_endian
>&,
3069 const Symbol_value
<size
>*);
3071 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3073 const Relocate_info
<size
, big_endian
>*,
3074 Target_aarch64
<size
, big_endian
>*,
3075 const elfcpp::Rela
<size
, big_endian
>&,
3078 const Symbol_value
<size
>*);
3080 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3082 const Relocate_info
<size
, big_endian
>*,
3083 Target_aarch64
<size
, big_endian
>*,
3084 const elfcpp::Rela
<size
, big_endian
>&,
3087 const Symbol_value
<size
>*);
3089 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3091 const Relocate_info
<size
, big_endian
>*,
3092 Target_aarch64
<size
, big_endian
>*,
3093 const elfcpp::Rela
<size
, big_endian
>&,
3096 const Symbol_value
<size
>*,
3097 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3098 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3100 bool skip_call_tls_get_addr_
;
3102 }; // End of class Relocate
3104 // A class which returns the size required for a relocation type,
3105 // used while scanning relocs during a relocatable link.
3106 class Relocatable_size_for_reloc
3110 get_size_for_reloc(unsigned int, Relobj
*);
3113 // Adjust TLS relocation type based on the options and whether this
3114 // is a local symbol.
3115 static tls::Tls_optimization
3116 optimize_tls_reloc(bool is_final
, int r_type
);
3118 // Get the GOT section, creating it if necessary.
3119 Output_data_got_aarch64
<size
, big_endian
>*
3120 got_section(Symbol_table
*, Layout
*);
3122 // Get the GOT PLT section.
3124 got_plt_section() const
3126 gold_assert(this->got_plt_
!= NULL
);
3127 return this->got_plt_
;
3130 // Get the GOT section for TLSDESC entries.
3131 Output_data_got
<size
, big_endian
>*
3132 got_tlsdesc_section() const
3134 gold_assert(this->got_tlsdesc_
!= NULL
);
3135 return this->got_tlsdesc_
;
3138 // Create the PLT section.
3140 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3142 // Create a PLT entry for a global symbol.
3144 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3146 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3148 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3149 Sized_relobj_file
<size
, big_endian
>* relobj
,
3150 unsigned int local_sym_index
);
3152 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3154 define_tls_base_symbol(Symbol_table
*, Layout
*);
3156 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3158 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3160 // Create a GOT entry for the TLS module index.
3162 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3163 Sized_relobj_file
<size
, big_endian
>* object
);
3165 // Get the PLT section.
3166 Output_data_plt_aarch64
<size
, big_endian
>*
3169 gold_assert(this->plt_
!= NULL
);
3173 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769.
3174 void create_erratum_stub(
3175 AArch64_relobj
<size
, big_endian
>* relobj
,
3177 section_size_type erratum_insn_offset
,
3178 Address erratum_address
,
3179 typename
Insn_utilities::Insntype erratum_insn
,
3182 // Return whether this is a 3-insn erratum sequence.
3183 bool is_erratum_843419_sequence(
3184 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3185 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3186 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3188 // Return whether this is a 835769 sequence.
3189 // (Similarly implemented as in elfnn-aarch64.c.)
3190 bool is_erratum_835769_sequence(
3191 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3192 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3194 // Get the dynamic reloc section, creating it if necessary.
3196 rela_dyn_section(Layout
*);
3198 // Get the section to use for TLSDESC relocations.
3200 rela_tlsdesc_section(Layout
*) const;
3202 // Get the section to use for IRELATIVE relocations.
3204 rela_irelative_section(Layout
*);
3206 // Add a potential copy relocation.
3208 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3209 Sized_relobj_file
<size
, big_endian
>* object
,
3210 unsigned int shndx
, Output_section
* output_section
,
3211 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3213 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3214 symtab
->get_sized_symbol
<size
>(sym
),
3215 object
, shndx
, output_section
,
3216 reloc
, this->rela_dyn_section(layout
));
3219 // Information about this specific target which we pass to the
3220 // general Target structure.
3221 static const Target::Target_info aarch64_info
;
3223 // The types of GOT entries needed for this platform.
3224 // These values are exposed to the ABI in an incremental link.
3225 // Do not renumber existing values without changing the version
3226 // number of the .gnu_incremental_inputs section.
3229 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3230 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3231 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3232 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3235 // This type is used as the argument to the target specific
3236 // relocation routines. The only target specific reloc is
3237 // R_AARCh64_TLSDESC against a local symbol.
3240 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3241 unsigned int a_r_sym
)
3242 : object(a_object
), r_sym(a_r_sym
)
3245 // The object in which the local symbol is defined.
3246 Sized_relobj_file
<size
, big_endian
>* object
;
3247 // The local symbol index in the object.
3252 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3254 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3255 // The GOT PLT section.
3256 Output_data_space
* got_plt_
;
3257 // The GOT section for IRELATIVE relocations.
3258 Output_data_space
* got_irelative_
;
3259 // The GOT section for TLSDESC relocations.
3260 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3261 // The _GLOBAL_OFFSET_TABLE_ symbol.
3262 Symbol
* global_offset_table_
;
3263 // The dynamic reloc section.
3264 Reloc_section
* rela_dyn_
;
3265 // The section to use for IRELATIVE relocs.
3266 Reloc_section
* rela_irelative_
;
3267 // Relocs saved to avoid a COPY reloc.
3268 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3269 // Offset of the GOT entry for the TLS module index.
3270 unsigned int got_mod_index_offset_
;
3271 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3272 // specific relocation. Here we store the object and local symbol
3273 // index for the relocation.
3274 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3275 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3276 bool tls_base_symbol_defined_
;
3277 // List of stub_tables
3278 Stub_table_list stub_tables_
;
3279 // Actual stub group size
3280 section_size_type stub_group_size_
;
3281 AArch64_input_section_map aarch64_input_section_map_
;
3282 }; // End of Target_aarch64
3286 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3289 false, // is_big_endian
3290 elfcpp::EM_AARCH64
, // machine_code
3291 false, // has_make_symbol
3292 false, // has_resolve
3293 false, // has_code_fill
3294 true, // is_default_stack_executable
3295 true, // can_icf_inline_merge_sections
3297 "/lib/ld.so.1", // program interpreter
3298 0x400000, // default_text_segment_address
3299 0x1000, // abi_pagesize (overridable by -z max-page-size)
3300 0x1000, // common_pagesize (overridable by -z common-page-size)
3301 false, // isolate_execinstr
3303 elfcpp::SHN_UNDEF
, // small_common_shndx
3304 elfcpp::SHN_UNDEF
, // large_common_shndx
3305 0, // small_common_section_flags
3306 0, // large_common_section_flags
3307 NULL
, // attributes_section
3308 NULL
, // attributes_vendor
3309 "_start" // entry_symbol_name
3313 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3316 false, // is_big_endian
3317 elfcpp::EM_AARCH64
, // machine_code
3318 false, // has_make_symbol
3319 false, // has_resolve
3320 false, // has_code_fill
3321 true, // is_default_stack_executable
3322 false, // can_icf_inline_merge_sections
3324 "/lib/ld.so.1", // program interpreter
3325 0x400000, // default_text_segment_address
3326 0x1000, // abi_pagesize (overridable by -z max-page-size)
3327 0x1000, // common_pagesize (overridable by -z common-page-size)
3328 false, // isolate_execinstr
3330 elfcpp::SHN_UNDEF
, // small_common_shndx
3331 elfcpp::SHN_UNDEF
, // large_common_shndx
3332 0, // small_common_section_flags
3333 0, // large_common_section_flags
3334 NULL
, // attributes_section
3335 NULL
, // attributes_vendor
3336 "_start" // entry_symbol_name
3340 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3343 true, // is_big_endian
3344 elfcpp::EM_AARCH64
, // machine_code
3345 false, // has_make_symbol
3346 false, // has_resolve
3347 false, // has_code_fill
3348 true, // is_default_stack_executable
3349 true, // can_icf_inline_merge_sections
3351 "/lib/ld.so.1", // program interpreter
3352 0x400000, // default_text_segment_address
3353 0x1000, // abi_pagesize (overridable by -z max-page-size)
3354 0x1000, // common_pagesize (overridable by -z common-page-size)
3355 false, // isolate_execinstr
3357 elfcpp::SHN_UNDEF
, // small_common_shndx
3358 elfcpp::SHN_UNDEF
, // large_common_shndx
3359 0, // small_common_section_flags
3360 0, // large_common_section_flags
3361 NULL
, // attributes_section
3362 NULL
, // attributes_vendor
3363 "_start" // entry_symbol_name
3367 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3370 true, // is_big_endian
3371 elfcpp::EM_AARCH64
, // machine_code
3372 false, // has_make_symbol
3373 false, // has_resolve
3374 false, // has_code_fill
3375 true, // is_default_stack_executable
3376 false, // can_icf_inline_merge_sections
3378 "/lib/ld.so.1", // program interpreter
3379 0x400000, // default_text_segment_address
3380 0x1000, // abi_pagesize (overridable by -z max-page-size)
3381 0x1000, // common_pagesize (overridable by -z common-page-size)
3382 false, // isolate_execinstr
3384 elfcpp::SHN_UNDEF
, // small_common_shndx
3385 elfcpp::SHN_UNDEF
, // large_common_shndx
3386 0, // small_common_section_flags
3387 0, // large_common_section_flags
3388 NULL
, // attributes_section
3389 NULL
, // attributes_vendor
3390 "_start" // entry_symbol_name
3393 // Get the GOT section, creating it if necessary.
3395 template<int size
, bool big_endian
>
3396 Output_data_got_aarch64
<size
, big_endian
>*
3397 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3400 if (this->got_
== NULL
)
3402 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3404 // When using -z now, we can treat .got.plt as a relro section.
3405 // Without -z now, it is modified after program startup by lazy
3407 bool is_got_plt_relro
= parameters
->options().now();
3408 Output_section_order got_order
= (is_got_plt_relro
3410 : ORDER_RELRO_LAST
);
3411 Output_section_order got_plt_order
= (is_got_plt_relro
3413 : ORDER_NON_RELRO_FIRST
);
3415 // Layout of .got and .got.plt sections.
3416 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3418 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3419 // .gotplt[1] reserved for ld.so (resolver)
3420 // .gotplt[2] reserved
3422 // Generate .got section.
3423 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3425 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3426 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3427 this->got_
, got_order
, true);
3428 // The first word of GOT is reserved for the address of .dynamic.
3429 // We put 0 here now. The value will be replaced later in
3430 // Output_data_got_aarch64::do_write.
3431 this->got_
->add_constant(0);
3433 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3434 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3435 // even if there is a .got.plt section.
3436 this->global_offset_table_
=
3437 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3438 Symbol_table::PREDEFINED
,
3440 0, 0, elfcpp::STT_OBJECT
,
3442 elfcpp::STV_HIDDEN
, 0,
3445 // Generate .got.plt section.
3446 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3447 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3449 | elfcpp::SHF_WRITE
),
3450 this->got_plt_
, got_plt_order
,
3453 // The first three entries are reserved.
3454 this->got_plt_
->set_current_data_size(
3455 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3457 // If there are any IRELATIVE relocations, they get GOT entries
3458 // in .got.plt after the jump slot entries.
3459 this->got_irelative_
= new Output_data_space(size
/ 8,
3460 "** GOT IRELATIVE PLT");
3461 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3463 | elfcpp::SHF_WRITE
),
3464 this->got_irelative_
,
3468 // If there are any TLSDESC relocations, they get GOT entries in
3469 // .got.plt after the jump slot and IRELATIVE entries.
3470 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3471 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3473 | elfcpp::SHF_WRITE
),
3478 if (!is_got_plt_relro
)
3480 // Those bytes can go into the relro segment.
3481 layout
->increase_relro(
3482 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3489 // Get the dynamic reloc section, creating it if necessary.
3491 template<int size
, bool big_endian
>
3492 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3493 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3495 if (this->rela_dyn_
== NULL
)
3497 gold_assert(layout
!= NULL
);
3498 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3499 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3500 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3501 ORDER_DYNAMIC_RELOCS
, false);
3503 return this->rela_dyn_
;
3506 // Get the section to use for IRELATIVE relocs, creating it if
3507 // necessary. These go in .rela.dyn, but only after all other dynamic
3508 // relocations. They need to follow the other dynamic relocations so
3509 // that they can refer to global variables initialized by those
3512 template<int size
, bool big_endian
>
3513 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3514 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3516 if (this->rela_irelative_
== NULL
)
3518 // Make sure we have already created the dynamic reloc section.
3519 this->rela_dyn_section(layout
);
3520 this->rela_irelative_
= new Reloc_section(false);
3521 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3522 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3523 ORDER_DYNAMIC_RELOCS
, false);
3524 gold_assert(this->rela_dyn_
->output_section()
3525 == this->rela_irelative_
->output_section());
3527 return this->rela_irelative_
;
3531 // do_make_elf_object to override the same function in the base class. We need
3532 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3533 // store backend specific information. Hence we need to have our own ELF object
3536 template<int size
, bool big_endian
>
3538 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3539 const std::string
& name
,
3540 Input_file
* input_file
,
3541 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3543 int et
= ehdr
.get_e_type();
3544 // ET_EXEC files are valid input for --just-symbols/-R,
3545 // and we treat them as relocatable objects.
3546 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3547 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3548 name
, input_file
, offset
, ehdr
);
3549 else if (et
== elfcpp::ET_REL
)
3551 AArch64_relobj
<size
, big_endian
>* obj
=
3552 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3556 else if (et
== elfcpp::ET_DYN
)
3558 // Keep base implementation.
3559 Sized_dynobj
<size
, big_endian
>* obj
=
3560 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3566 gold_error(_("%s: unsupported ELF file type %d"),
3573 // Scan a relocation for stub generation.
3575 template<int size
, bool big_endian
>
3577 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3578 const Relocate_info
<size
, big_endian
>* relinfo
,
3579 unsigned int r_type
,
3580 const Sized_symbol
<size
>* gsym
,
3582 const Symbol_value
<size
>* psymval
,
3583 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3586 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3587 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3589 Symbol_value
<size
> symval
;
3592 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3593 get_reloc_property(r_type
);
3594 if (gsym
->use_plt_offset(arp
->reference_flags()))
3596 // This uses a PLT, change the symbol value.
3597 symval
.set_output_value(this->plt_section()->address()
3598 + gsym
->plt_offset());
3601 else if (gsym
->is_undefined())
3602 // There is no need to generate a stub symbol is undefined.
3606 // Get the symbol value.
3607 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3609 // Owing to pipelining, the PC relative branches below actually skip
3610 // two instructions when the branch offset is 0.
3611 Address destination
= static_cast<Address
>(-1);
3614 case elfcpp::R_AARCH64_CALL26
:
3615 case elfcpp::R_AARCH64_JUMP26
:
3616 destination
= value
+ addend
;
3622 int stub_type
= The_reloc_stub::
3623 stub_type_for_reloc(r_type
, address
, destination
);
3624 if (stub_type
== ST_NONE
)
3627 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3628 gold_assert(stub_table
!= NULL
);
3630 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3631 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3634 stub
= new The_reloc_stub(stub_type
);
3635 stub_table
->add_reloc_stub(stub
, key
);
3637 stub
->set_destination_address(destination
);
3638 } // End of Target_aarch64::scan_reloc_for_stub
3641 // This function scans a relocation section for stub generation.
3642 // The template parameter Relocate must be a class type which provides
3643 // a single function, relocate(), which implements the machine
3644 // specific part of a relocation.
3646 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3647 // SHT_REL or SHT_RELA.
3649 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3650 // of relocs. OUTPUT_SECTION is the output section.
3651 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3652 // mapped to output offsets.
3654 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3655 // VIEW_SIZE is the size. These refer to the input section, unless
3656 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3657 // the output section.
3659 template<int size
, bool big_endian
>
3660 template<int sh_type
>
3662 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3663 const Relocate_info
<size
, big_endian
>* relinfo
,
3664 const unsigned char* prelocs
,
3666 Output_section
* /*output_section*/,
3667 bool /*needs_special_offset_handling*/,
3668 const unsigned char* /*view*/,
3669 Address view_address
,
3672 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3674 const int reloc_size
=
3675 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3676 AArch64_relobj
<size
, big_endian
>* object
=
3677 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3678 unsigned int local_count
= object
->local_symbol_count();
3680 gold::Default_comdat_behavior default_comdat_behavior
;
3681 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3683 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3685 Reltype
reloc(prelocs
);
3686 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3687 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3688 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3689 if (r_type
!= elfcpp::R_AARCH64_CALL26
3690 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3693 section_offset_type offset
=
3694 convert_to_section_size_type(reloc
.get_r_offset());
3697 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3698 reloc
.get_r_addend();
3700 const Sized_symbol
<size
>* sym
;
3701 Symbol_value
<size
> symval
;
3702 const Symbol_value
<size
> *psymval
;
3703 bool is_defined_in_discarded_section
;
3705 if (r_sym
< local_count
)
3708 psymval
= object
->local_symbol(r_sym
);
3710 // If the local symbol belongs to a section we are discarding,
3711 // and that section is a debug section, try to find the
3712 // corresponding kept section and map this symbol to its
3713 // counterpart in the kept section. The symbol must not
3714 // correspond to a section we are folding.
3716 shndx
= psymval
->input_shndx(&is_ordinary
);
3717 is_defined_in_discarded_section
=
3719 && shndx
!= elfcpp::SHN_UNDEF
3720 && !object
->is_section_included(shndx
)
3721 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3723 // We need to compute the would-be final value of this local
3725 if (!is_defined_in_discarded_section
)
3727 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3728 typename
ObjType::Compute_final_local_value_status status
=
3729 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3731 if (status
== ObjType::CFLV_OK
)
3733 // Currently we cannot handle a branch to a target in
3734 // a merged section. If this is the case, issue an error
3735 // and also free the merge symbol value.
3736 if (!symval
.has_output_value())
3738 const std::string
& section_name
=
3739 object
->section_name(shndx
);
3740 object
->error(_("cannot handle branch to local %u "
3741 "in a merged section %s"),
3742 r_sym
, section_name
.c_str());
3748 // We cannot determine the final value.
3756 gsym
= object
->global_symbol(r_sym
);
3757 gold_assert(gsym
!= NULL
);
3758 if (gsym
->is_forwarder())
3759 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
3761 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
3762 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
3763 symval
.set_output_symtab_index(sym
->symtab_index());
3765 symval
.set_no_output_symtab_entry();
3767 // We need to compute the would-be final value of this global
3769 const Symbol_table
* symtab
= relinfo
->symtab
;
3770 const Sized_symbol
<size
>* sized_symbol
=
3771 symtab
->get_sized_symbol
<size
>(gsym
);
3772 Symbol_table::Compute_final_value_status status
;
3773 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3774 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
3776 // Skip this if the symbol has not output section.
3777 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
3779 symval
.set_output_value(value
);
3781 if (gsym
->type() == elfcpp::STT_TLS
)
3782 symval
.set_is_tls_symbol();
3783 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
3784 symval
.set_is_ifunc_symbol();
3787 is_defined_in_discarded_section
=
3788 (gsym
->is_defined_in_discarded_section()
3789 && gsym
->is_undefined());
3793 Symbol_value
<size
> symval2
;
3794 if (is_defined_in_discarded_section
)
3796 if (comdat_behavior
== CB_UNDETERMINED
)
3798 std::string name
= object
->section_name(relinfo
->data_shndx
);
3799 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
3801 if (comdat_behavior
== CB_PRETEND
)
3804 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3805 object
->map_to_kept_section(shndx
, &found
);
3807 symval2
.set_output_value(value
+ psymval
->input_value());
3809 symval2
.set_output_value(0);
3813 if (comdat_behavior
== CB_WARNING
)
3814 gold_warning_at_location(relinfo
, i
, offset
,
3815 _("relocation refers to discarded "
3817 symval2
.set_output_value(0);
3819 symval2
.set_no_output_symtab_entry();
3823 // If symbol is a section symbol, we don't know the actual type of
3824 // destination. Give up.
3825 if (psymval
->is_section_symbol())
3828 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
3829 addend
, view_address
+ offset
);
3830 } // End of iterating relocs in a section
3831 } // End of Target_aarch64::scan_reloc_section_for_stubs
3834 // Scan an input section for stub generation.
3836 template<int size
, bool big_endian
>
3838 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
3839 const Relocate_info
<size
, big_endian
>* relinfo
,
3840 unsigned int sh_type
,
3841 const unsigned char* prelocs
,
3843 Output_section
* output_section
,
3844 bool needs_special_offset_handling
,
3845 const unsigned char* view
,
3846 Address view_address
,
3847 section_size_type view_size
)
3849 gold_assert(sh_type
== elfcpp::SHT_RELA
);
3850 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
3855 needs_special_offset_handling
,
3862 // Relocate a single stub.
3864 template<int size
, bool big_endian
>
3865 void Target_aarch64
<size
, big_endian
>::
3866 relocate_stub(The_reloc_stub
* stub
,
3867 const The_relocate_info
*,
3869 unsigned char* view
,
3873 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
3874 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
3875 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
3877 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
3878 int insn_number
= stub
->insn_num();
3879 const uint32_t* insns
= stub
->insns();
3880 // Check the insns are really those stub insns.
3881 for (int i
= 0; i
< insn_number
; ++i
)
3883 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
3884 gold_assert(((uint32_t)insn
== insns
[i
]));
3887 Address dest
= stub
->destination_address();
3889 switch(stub
->type())
3891 case ST_ADRP_BRANCH
:
3893 // 1st reloc is ADR_PREL_PG_HI21
3894 The_reloc_functions_status status
=
3895 The_reloc_functions::adrp(view
, dest
, address
);
3896 // An error should never arise in the above step. If so, please
3897 // check 'aarch64_valid_for_adrp_p'.
3898 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
3900 // 2nd reloc is ADD_ABS_LO12_NC
3901 const AArch64_reloc_property
* arp
=
3902 aarch64_reloc_property_table
->get_reloc_property(
3903 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
3904 gold_assert(arp
!= NULL
);
3905 status
= The_reloc_functions::template
3906 rela_general
<32>(view
+ 4, dest
, 0, arp
);
3907 // An error should never arise, it is an "_NC" relocation.
3908 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
3912 case ST_LONG_BRANCH_ABS
:
3913 // 1st reloc is R_AARCH64_PREL64, at offset 8
3914 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
3917 case ST_LONG_BRANCH_PCREL
:
3919 // "PC" calculation is the 2nd insn in the stub.
3920 uint64_t offset
= dest
- (address
+ 4);
3921 // Offset is placed at offset 4 and 5.
3922 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
3932 // A class to handle the PLT data.
3933 // This is an abstract base class that handles most of the linker details
3934 // but does not know the actual contents of PLT entries. The derived
3935 // classes below fill in those details.
3937 template<int size
, bool big_endian
>
3938 class Output_data_plt_aarch64
: public Output_section_data
3941 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
3943 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
3945 Output_data_plt_aarch64(Layout
* layout
,
3947 Output_data_got_aarch64
<size
, big_endian
>* got
,
3948 Output_data_space
* got_plt
,
3949 Output_data_space
* got_irelative
)
3950 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
3951 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
3952 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
3953 { this->init(layout
); }
3955 // Initialize the PLT section.
3957 init(Layout
* layout
);
3959 // Add an entry to the PLT.
3961 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
3963 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
3965 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
3966 Sized_relobj_file
<size
, big_endian
>* relobj
,
3967 unsigned int local_sym_index
);
3969 // Add the relocation for a PLT entry.
3971 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
3972 unsigned int got_offset
);
3974 // Add the reserved TLSDESC_PLT entry to the PLT.
3976 reserve_tlsdesc_entry(unsigned int got_offset
)
3977 { this->tlsdesc_got_offset_
= got_offset
; }
3979 // Return true if a TLSDESC_PLT entry has been reserved.
3981 has_tlsdesc_entry() const
3982 { return this->tlsdesc_got_offset_
!= -1U; }
3984 // Return the GOT offset for the reserved TLSDESC_PLT entry.
3986 get_tlsdesc_got_offset() const
3987 { return this->tlsdesc_got_offset_
; }
3989 // Return the PLT offset of the reserved TLSDESC_PLT entry.
3991 get_tlsdesc_plt_offset() const
3993 return (this->first_plt_entry_offset() +
3994 (this->count_
+ this->irelative_count_
)
3995 * this->get_plt_entry_size());
3998 // Return the .rela.plt section data.
4001 { return this->rel_
; }
4003 // Return where the TLSDESC relocations should go.
4005 rela_tlsdesc(Layout
*);
4007 // Return where the IRELATIVE relocations should go in the PLT
4010 rela_irelative(Symbol_table
*, Layout
*);
4012 // Return whether we created a section for IRELATIVE relocations.
4014 has_irelative_section() const
4015 { return this->irelative_rel_
!= NULL
; }
4017 // Return the number of PLT entries.
4020 { return this->count_
+ this->irelative_count_
; }
4022 // Return the offset of the first non-reserved PLT entry.
4024 first_plt_entry_offset() const
4025 { return this->do_first_plt_entry_offset(); }
4027 // Return the size of a PLT entry.
4029 get_plt_entry_size() const
4030 { return this->do_get_plt_entry_size(); }
4032 // Return the reserved tlsdesc entry size.
4034 get_plt_tlsdesc_entry_size() const
4035 { return this->do_get_plt_tlsdesc_entry_size(); }
4037 // Return the PLT address to use for a global symbol.
4039 address_for_global(const Symbol
*);
4041 // Return the PLT address to use for a local symbol.
4043 address_for_local(const Relobj
*, unsigned int symndx
);
4046 // Fill in the first PLT entry.
4048 fill_first_plt_entry(unsigned char* pov
,
4049 Address got_address
,
4050 Address plt_address
)
4051 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4053 // Fill in a normal PLT entry.
4055 fill_plt_entry(unsigned char* pov
,
4056 Address got_address
,
4057 Address plt_address
,
4058 unsigned int got_offset
,
4059 unsigned int plt_offset
)
4061 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4062 got_offset
, plt_offset
);
4065 // Fill in the reserved TLSDESC PLT entry.
4067 fill_tlsdesc_entry(unsigned char* pov
,
4068 Address gotplt_address
,
4069 Address plt_address
,
4071 unsigned int tlsdesc_got_offset
,
4072 unsigned int plt_offset
)
4074 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4075 tlsdesc_got_offset
, plt_offset
);
4078 virtual unsigned int
4079 do_first_plt_entry_offset() const = 0;
4081 virtual unsigned int
4082 do_get_plt_entry_size() const = 0;
4084 virtual unsigned int
4085 do_get_plt_tlsdesc_entry_size() const = 0;
4088 do_fill_first_plt_entry(unsigned char* pov
,
4090 Address plt_addr
) = 0;
4093 do_fill_plt_entry(unsigned char* pov
,
4094 Address got_address
,
4095 Address plt_address
,
4096 unsigned int got_offset
,
4097 unsigned int plt_offset
) = 0;
4100 do_fill_tlsdesc_entry(unsigned char* pov
,
4101 Address gotplt_address
,
4102 Address plt_address
,
4104 unsigned int tlsdesc_got_offset
,
4105 unsigned int plt_offset
) = 0;
4108 do_adjust_output_section(Output_section
* os
);
4110 // Write to a map file.
4112 do_print_to_mapfile(Mapfile
* mapfile
) const
4113 { mapfile
->print_output_data(this, _("** PLT")); }
4116 // Set the final size.
4118 set_final_data_size();
4120 // Write out the PLT data.
4122 do_write(Output_file
*);
4124 // The reloc section.
4125 Reloc_section
* rel_
;
4127 // The TLSDESC relocs, if necessary. These must follow the regular
4129 Reloc_section
* tlsdesc_rel_
;
4131 // The IRELATIVE relocs, if necessary. These must follow the
4132 // regular PLT relocations.
4133 Reloc_section
* irelative_rel_
;
4135 // The .got section.
4136 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4138 // The .got.plt section.
4139 Output_data_space
* got_plt_
;
4141 // The part of the .got.plt section used for IRELATIVE relocs.
4142 Output_data_space
* got_irelative_
;
4144 // The number of PLT entries.
4145 unsigned int count_
;
4147 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4148 // follow the regular PLT entries.
4149 unsigned int irelative_count_
;
4151 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4152 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4153 // indicates an offset is not allocated.
4154 unsigned int tlsdesc_got_offset_
;
4157 // Initialize the PLT section.
4159 template<int size
, bool big_endian
>
4161 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4163 this->rel_
= new Reloc_section(false);
4164 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4165 elfcpp::SHF_ALLOC
, this->rel_
,
4166 ORDER_DYNAMIC_PLT_RELOCS
, false);
4169 template<int size
, bool big_endian
>
4171 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4174 os
->set_entsize(this->get_plt_entry_size());
4177 // Add an entry to the PLT.
4179 template<int size
, bool big_endian
>
4181 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4182 Layout
* layout
, Symbol
* gsym
)
4184 gold_assert(!gsym
->has_plt_offset());
4186 unsigned int* pcount
;
4187 unsigned int plt_reserved
;
4188 Output_section_data_build
* got
;
4190 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4191 && gsym
->can_use_relative_reloc(false))
4193 pcount
= &this->irelative_count_
;
4195 got
= this->got_irelative_
;
4199 pcount
= &this->count_
;
4200 plt_reserved
= this->first_plt_entry_offset();
4201 got
= this->got_plt_
;
4204 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4209 section_offset_type got_offset
= got
->current_data_size();
4211 // Every PLT entry needs a GOT entry which points back to the PLT
4212 // entry (this will be changed by the dynamic linker, normally
4213 // lazily when the function is called).
4214 got
->set_current_data_size(got_offset
+ size
/ 8);
4216 // Every PLT entry needs a reloc.
4217 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4219 // Note that we don't need to save the symbol. The contents of the
4220 // PLT are independent of which symbols are used. The symbols only
4221 // appear in the relocations.
4224 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4227 template<int size
, bool big_endian
>
4229 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4230 Symbol_table
* symtab
,
4232 Sized_relobj_file
<size
, big_endian
>* relobj
,
4233 unsigned int local_sym_index
)
4235 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4236 ++this->irelative_count_
;
4238 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4240 // Every PLT entry needs a GOT entry which points back to the PLT
4242 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4244 // Every PLT entry needs a reloc.
4245 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4246 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4247 elfcpp::R_AARCH64_IRELATIVE
,
4248 this->got_irelative_
, got_offset
, 0);
4253 // Add the relocation for a PLT entry.
4255 template<int size
, bool big_endian
>
4257 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4258 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4260 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4261 && gsym
->can_use_relative_reloc(false))
4263 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4264 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4265 this->got_irelative_
, got_offset
, 0);
4269 gsym
->set_needs_dynsym_entry();
4270 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4275 // Return where the TLSDESC relocations should go, creating it if
4276 // necessary. These follow the JUMP_SLOT relocations.
4278 template<int size
, bool big_endian
>
4279 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4280 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4282 if (this->tlsdesc_rel_
== NULL
)
4284 this->tlsdesc_rel_
= new Reloc_section(false);
4285 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4286 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4287 ORDER_DYNAMIC_PLT_RELOCS
, false);
4288 gold_assert(this->tlsdesc_rel_
->output_section()
4289 == this->rel_
->output_section());
4291 return this->tlsdesc_rel_
;
4294 // Return where the IRELATIVE relocations should go in the PLT. These
4295 // follow the JUMP_SLOT and the TLSDESC relocations.
4297 template<int size
, bool big_endian
>
4298 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4299 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4302 if (this->irelative_rel_
== NULL
)
4304 // Make sure we have a place for the TLSDESC relocations, in
4305 // case we see any later on.
4306 this->rela_tlsdesc(layout
);
4307 this->irelative_rel_
= new Reloc_section(false);
4308 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4309 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4310 ORDER_DYNAMIC_PLT_RELOCS
, false);
4311 gold_assert(this->irelative_rel_
->output_section()
4312 == this->rel_
->output_section());
4314 if (parameters
->doing_static_link())
4316 // A statically linked executable will only have a .rela.plt
4317 // section to hold R_AARCH64_IRELATIVE relocs for
4318 // STT_GNU_IFUNC symbols. The library will use these
4319 // symbols to locate the IRELATIVE relocs at program startup
4321 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4322 Symbol_table::PREDEFINED
,
4323 this->irelative_rel_
, 0, 0,
4324 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4325 elfcpp::STV_HIDDEN
, 0, false, true);
4326 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4327 Symbol_table::PREDEFINED
,
4328 this->irelative_rel_
, 0, 0,
4329 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4330 elfcpp::STV_HIDDEN
, 0, true, true);
4333 return this->irelative_rel_
;
4336 // Return the PLT address to use for a global symbol.
4338 template<int size
, bool big_endian
>
4340 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4343 uint64_t offset
= 0;
4344 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4345 && gsym
->can_use_relative_reloc(false))
4346 offset
= (this->first_plt_entry_offset() +
4347 this->count_
* this->get_plt_entry_size());
4348 return this->address() + offset
+ gsym
->plt_offset();
4351 // Return the PLT address to use for a local symbol. These are always
4352 // IRELATIVE relocs.
4354 template<int size
, bool big_endian
>
4356 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4357 const Relobj
* object
,
4360 return (this->address()
4361 + this->first_plt_entry_offset()
4362 + this->count_
* this->get_plt_entry_size()
4363 + object
->local_plt_offset(r_sym
));
4366 // Set the final size.
4368 template<int size
, bool big_endian
>
4370 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4372 unsigned int count
= this->count_
+ this->irelative_count_
;
4373 unsigned int extra_size
= 0;
4374 if (this->has_tlsdesc_entry())
4375 extra_size
+= this->get_plt_tlsdesc_entry_size();
4376 this->set_data_size(this->first_plt_entry_offset()
4377 + count
* this->get_plt_entry_size()
4381 template<int size
, bool big_endian
>
4382 class Output_data_plt_aarch64_standard
:
4383 public Output_data_plt_aarch64
<size
, big_endian
>
4386 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4387 Output_data_plt_aarch64_standard(
4389 Output_data_got_aarch64
<size
, big_endian
>* got
,
4390 Output_data_space
* got_plt
,
4391 Output_data_space
* got_irelative
)
4392 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4399 // Return the offset of the first non-reserved PLT entry.
4400 virtual unsigned int
4401 do_first_plt_entry_offset() const
4402 { return this->first_plt_entry_size
; }
4404 // Return the size of a PLT entry
4405 virtual unsigned int
4406 do_get_plt_entry_size() const
4407 { return this->plt_entry_size
; }
4409 // Return the size of a tlsdesc entry
4410 virtual unsigned int
4411 do_get_plt_tlsdesc_entry_size() const
4412 { return this->plt_tlsdesc_entry_size
; }
4415 do_fill_first_plt_entry(unsigned char* pov
,
4416 Address got_address
,
4417 Address plt_address
);
4420 do_fill_plt_entry(unsigned char* pov
,
4421 Address got_address
,
4422 Address plt_address
,
4423 unsigned int got_offset
,
4424 unsigned int plt_offset
);
4427 do_fill_tlsdesc_entry(unsigned char* pov
,
4428 Address gotplt_address
,
4429 Address plt_address
,
4431 unsigned int tlsdesc_got_offset
,
4432 unsigned int plt_offset
);
4435 // The size of the first plt entry size.
4436 static const int first_plt_entry_size
= 32;
4437 // The size of the plt entry size.
4438 static const int plt_entry_size
= 16;
4439 // The size of the plt tlsdesc entry size.
4440 static const int plt_tlsdesc_entry_size
= 32;
4441 // Template for the first PLT entry.
4442 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4443 // Template for subsequent PLT entries.
4444 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4445 // The reserved TLSDESC entry in the PLT for an executable.
4446 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4449 // The first entry in the PLT for an executable.
4453 Output_data_plt_aarch64_standard
<32, false>::
4454 first_plt_entry
[first_plt_entry_size
/ 4] =
4456 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4457 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4458 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4459 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4460 0xd61f0220, /* br x17 */
4461 0xd503201f, /* nop */
4462 0xd503201f, /* nop */
4463 0xd503201f, /* nop */
4469 Output_data_plt_aarch64_standard
<32, true>::
4470 first_plt_entry
[first_plt_entry_size
/ 4] =
4472 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4473 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4474 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4475 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4476 0xd61f0220, /* br x17 */
4477 0xd503201f, /* nop */
4478 0xd503201f, /* nop */
4479 0xd503201f, /* nop */
4485 Output_data_plt_aarch64_standard
<64, false>::
4486 first_plt_entry
[first_plt_entry_size
/ 4] =
4488 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4489 0x90000010, /* adrp x16, PLT_GOT+16 */
4490 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4491 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4492 0xd61f0220, /* br x17 */
4493 0xd503201f, /* nop */
4494 0xd503201f, /* nop */
4495 0xd503201f, /* nop */
4501 Output_data_plt_aarch64_standard
<64, true>::
4502 first_plt_entry
[first_plt_entry_size
/ 4] =
4504 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4505 0x90000010, /* adrp x16, PLT_GOT+16 */
4506 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4507 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4508 0xd61f0220, /* br x17 */
4509 0xd503201f, /* nop */
4510 0xd503201f, /* nop */
4511 0xd503201f, /* nop */
4517 Output_data_plt_aarch64_standard
<32, false>::
4518 plt_entry
[plt_entry_size
/ 4] =
4520 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4521 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4522 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4523 0xd61f0220, /* br x17. */
4529 Output_data_plt_aarch64_standard
<32, true>::
4530 plt_entry
[plt_entry_size
/ 4] =
4532 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4533 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4534 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4535 0xd61f0220, /* br x17. */
4541 Output_data_plt_aarch64_standard
<64, false>::
4542 plt_entry
[plt_entry_size
/ 4] =
4544 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4545 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4546 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4547 0xd61f0220, /* br x17. */
4553 Output_data_plt_aarch64_standard
<64, true>::
4554 plt_entry
[plt_entry_size
/ 4] =
4556 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4557 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4558 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4559 0xd61f0220, /* br x17. */
4563 template<int size
, bool big_endian
>
4565 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4567 Address got_address
,
4568 Address plt_address
)
4570 // PLT0 of the small PLT looks like this in ELF64 -
4571 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4572 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4573 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4575 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4576 // GOTPLT entry for this.
4578 // PLT0 will be slightly different in ELF32 due to different got entry
4580 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4581 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4583 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4584 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4585 // FIXME: This only works for 64bit
4586 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4587 gotplt_2nd_ent
, plt_address
+ 4);
4589 // Fill in R_AARCH64_LDST8_LO12
4590 elfcpp::Swap
<32, big_endian
>::writeval(
4592 ((this->first_plt_entry
[2] & 0xffc003ff)
4593 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4595 // Fill in R_AARCH64_ADD_ABS_LO12
4596 elfcpp::Swap
<32, big_endian
>::writeval(
4598 ((this->first_plt_entry
[3] & 0xffc003ff)
4599 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4603 // Subsequent entries in the PLT for an executable.
4604 // FIXME: This only works for 64bit
4606 template<int size
, bool big_endian
>
4608 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4610 Address got_address
,
4611 Address plt_address
,
4612 unsigned int got_offset
,
4613 unsigned int plt_offset
)
4615 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4617 Address gotplt_entry_address
= got_address
+ got_offset
;
4618 Address plt_entry_address
= plt_address
+ plt_offset
;
4620 // Fill in R_AARCH64_PCREL_ADR_HI21
4621 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4623 gotplt_entry_address
,
4626 // Fill in R_AARCH64_LDST64_ABS_LO12
4627 elfcpp::Swap
<32, big_endian
>::writeval(
4629 ((this->plt_entry
[1] & 0xffc003ff)
4630 | ((gotplt_entry_address
& 0xff8) << 7)));
4632 // Fill in R_AARCH64_ADD_ABS_LO12
4633 elfcpp::Swap
<32, big_endian
>::writeval(
4635 ((this->plt_entry
[2] & 0xffc003ff)
4636 | ((gotplt_entry_address
& 0xfff) <<10)));
4643 Output_data_plt_aarch64_standard
<32, false>::
4644 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4646 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4647 0x90000002, /* adrp x2, 0 */
4648 0x90000003, /* adrp x3, 0 */
4649 0xb9400042, /* ldr w2, [w2, #0] */
4650 0x11000063, /* add w3, w3, 0 */
4651 0xd61f0040, /* br x2 */
4652 0xd503201f, /* nop */
4653 0xd503201f, /* nop */
4658 Output_data_plt_aarch64_standard
<32, true>::
4659 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4661 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4662 0x90000002, /* adrp x2, 0 */
4663 0x90000003, /* adrp x3, 0 */
4664 0xb9400042, /* ldr w2, [w2, #0] */
4665 0x11000063, /* add w3, w3, 0 */
4666 0xd61f0040, /* br x2 */
4667 0xd503201f, /* nop */
4668 0xd503201f, /* nop */
4673 Output_data_plt_aarch64_standard
<64, false>::
4674 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4676 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4677 0x90000002, /* adrp x2, 0 */
4678 0x90000003, /* adrp x3, 0 */
4679 0xf9400042, /* ldr x2, [x2, #0] */
4680 0x91000063, /* add x3, x3, 0 */
4681 0xd61f0040, /* br x2 */
4682 0xd503201f, /* nop */
4683 0xd503201f, /* nop */
4688 Output_data_plt_aarch64_standard
<64, true>::
4689 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4691 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4692 0x90000002, /* adrp x2, 0 */
4693 0x90000003, /* adrp x3, 0 */
4694 0xf9400042, /* ldr x2, [x2, #0] */
4695 0x91000063, /* add x3, x3, 0 */
4696 0xd61f0040, /* br x2 */
4697 0xd503201f, /* nop */
4698 0xd503201f, /* nop */
4701 template<int size
, bool big_endian
>
4703 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4705 Address gotplt_address
,
4706 Address plt_address
,
4708 unsigned int tlsdesc_got_offset
,
4709 unsigned int plt_offset
)
4711 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4713 // move DT_TLSDESC_GOT address into x2
4714 // move .got.plt address into x3
4715 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4716 Address plt_entry_address
= plt_address
+ plt_offset
;
4718 // R_AARCH64_ADR_PREL_PG_HI21
4719 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4722 plt_entry_address
+ 4);
4724 // R_AARCH64_ADR_PREL_PG_HI21
4725 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4728 plt_entry_address
+ 8);
4730 // R_AARCH64_LDST64_ABS_LO12
4731 elfcpp::Swap
<32, big_endian
>::writeval(
4733 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4734 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4736 // R_AARCH64_ADD_ABS_LO12
4737 elfcpp::Swap
<32, big_endian
>::writeval(
4739 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
4740 | ((gotplt_address
& 0xfff) << 10)));
4743 // Write out the PLT. This uses the hand-coded instructions above,
4744 // and adjusts them as needed. This is specified by the AMD64 ABI.
4746 template<int size
, bool big_endian
>
4748 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
4750 const off_t offset
= this->offset();
4751 const section_size_type oview_size
=
4752 convert_to_section_size_type(this->data_size());
4753 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
4755 const off_t got_file_offset
= this->got_plt_
->offset();
4756 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
4757 == this->got_irelative_
->offset());
4759 const section_size_type got_size
=
4760 convert_to_section_size_type(this->got_plt_
->data_size()
4761 + this->got_irelative_
->data_size());
4762 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
4765 unsigned char* pov
= oview
;
4767 // The base address of the .plt section.
4768 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
4769 // The base address of the PLT portion of the .got section.
4770 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
4771 = this->got_plt_
->address();
4773 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
4774 pov
+= this->first_plt_entry_offset();
4776 // The first three entries in .got.plt are reserved.
4777 unsigned char* got_pov
= got_view
;
4778 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
4779 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4781 unsigned int plt_offset
= this->first_plt_entry_offset();
4782 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4783 const unsigned int count
= this->count_
+ this->irelative_count_
;
4784 for (unsigned int plt_index
= 0;
4787 pov
+= this->get_plt_entry_size(),
4788 got_pov
+= size
/ 8,
4789 plt_offset
+= this->get_plt_entry_size(),
4790 got_offset
+= size
/ 8)
4792 // Set and adjust the PLT entry itself.
4793 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
4794 got_offset
, plt_offset
);
4796 // Set the entry in the GOT, which points to plt0.
4797 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
4800 if (this->has_tlsdesc_entry())
4802 // Set and adjust the reserved TLSDESC PLT entry.
4803 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
4804 // The base address of the .base section.
4805 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
4806 this->got_
->address();
4807 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4808 tlsdesc_got_offset
, plt_offset
);
4809 pov
+= this->get_plt_tlsdesc_entry_size();
4812 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
4813 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
4815 of
->write_output_view(offset
, oview_size
, oview
);
4816 of
->write_output_view(got_file_offset
, got_size
, got_view
);
4819 // Telling how to update the immediate field of an instruction.
4820 struct AArch64_howto
4822 // The immediate field mask.
4823 elfcpp::Elf_Xword dst_mask
;
4825 // The offset to apply relocation immediate
4828 // The second part offset, if the immediate field has two parts.
4829 // -1 if the immediate field has only one part.
4833 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
4835 {0, -1, -1}, // DATA
4836 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
4837 {0xffffe0, 5, -1}, // LD [23:5]-imm19
4838 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
4839 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
4840 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
4841 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
4842 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
4843 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
4844 {0x3ffffff, 0, -1}, // B [25:0]-imm26
4845 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
4848 // AArch64 relocate function class
4850 template<int size
, bool big_endian
>
4851 class AArch64_relocate_functions
4856 STATUS_OKAY
, // No error during relocation.
4857 STATUS_OVERFLOW
, // Relocation overflow.
4858 STATUS_BAD_RELOC
, // Relocation cannot be applied.
4861 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
4862 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4863 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
4864 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
4865 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
4866 typedef Stub_table
<size
, big_endian
> The_stub_table
;
4867 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
4868 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
4870 // Return the page address of the address.
4871 // Page(address) = address & ~0xFFF
4873 static inline AArch64_valtype
4874 Page(Address address
)
4876 return (address
& (~static_cast<Address
>(0xFFF)));
4880 // Update instruction (pointed by view) with selected bits (immed).
4881 // val = (val & ~dst_mask) | (immed << doffset)
4883 template<int valsize
>
4885 update_view(unsigned char* view
,
4886 AArch64_valtype immed
,
4887 elfcpp::Elf_Xword doffset
,
4888 elfcpp::Elf_Xword dst_mask
)
4890 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
4891 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
4892 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
4894 // Clear immediate fields.
4896 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
4897 static_cast<Valtype
>(val
| (immed
<< doffset
)));
4900 // Update two parts of an instruction (pointed by view) with selected
4901 // bits (immed1 and immed2).
4902 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
4904 template<int valsize
>
4906 update_view_two_parts(
4907 unsigned char* view
,
4908 AArch64_valtype immed1
,
4909 AArch64_valtype immed2
,
4910 elfcpp::Elf_Xword doffset1
,
4911 elfcpp::Elf_Xword doffset2
,
4912 elfcpp::Elf_Xword dst_mask
)
4914 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
4915 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
4916 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
4918 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
4919 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
4920 (immed2
<< doffset2
)));
4923 // Update adr or adrp instruction with immed.
4924 // In adr and adrp: [30:29] immlo [23:5] immhi
4927 update_adr(unsigned char* view
, AArch64_valtype immed
)
4929 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
4930 This::template update_view_two_parts
<32>(
4933 (immed
& 0x1ffffc) >> 2,
4939 // Update movz/movn instruction with bits immed.
4940 // Set instruction to movz if is_movz is true, otherwise set instruction
4944 update_movnz(unsigned char* view
,
4945 AArch64_valtype immed
,
4948 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
4949 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
4950 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
4952 const elfcpp::Elf_Xword doffset
=
4953 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
4954 const elfcpp::Elf_Xword dst_mask
=
4955 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
4957 // Clear immediate fields and opc code.
4958 val
&= ~(dst_mask
| (0x3 << 29));
4960 // Set instruction to movz or movn.
4961 // movz: [30:29] is 10 movn: [30:29] is 00
4965 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
4966 static_cast<Valtype
>(val
| (immed
<< doffset
)));
4969 // Update selected bits in text.
4971 template<int valsize
>
4972 static inline typename
This::Status
4973 reloc_common(unsigned char* view
, Address x
,
4974 const AArch64_reloc_property
* reloc_property
)
4976 // Select bits from X.
4977 Address immed
= reloc_property
->select_x_value(x
);
4980 const AArch64_reloc_property::Reloc_inst inst
=
4981 reloc_property
->reloc_inst();
4982 // If it is a data relocation or instruction has 2 parts of immediate
4983 // fields, you should not call pcrela_general.
4984 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
4985 aarch64_howto
[inst
].doffset
!= -1);
4986 This::template update_view
<valsize
>(view
, immed
,
4987 aarch64_howto
[inst
].doffset
,
4988 aarch64_howto
[inst
].dst_mask
);
4990 // Do check overflow or alignment if needed.
4991 return (reloc_property
->checkup_x_value(x
)
4993 : This::STATUS_OVERFLOW
);
4998 // Construct a B insn. Note, although we group it here with other relocation
4999 // operation, there is actually no 'relocation' involved here.
5001 construct_b(unsigned char* view
, unsigned int branch_offset
)
5003 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5007 // Do a simple rela relocation at unaligned addresses.
5009 template<int valsize
>
5010 static inline typename
This::Status
5011 rela_ua(unsigned char* view
,
5012 const Sized_relobj_file
<size
, big_endian
>* object
,
5013 const Symbol_value
<size
>* psymval
,
5014 AArch64_valtype addend
,
5015 const AArch64_reloc_property
* reloc_property
)
5017 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5019 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5020 psymval
->value(object
, addend
);
5021 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5022 static_cast<Valtype
>(x
));
5023 return (reloc_property
->checkup_x_value(x
)
5025 : This::STATUS_OVERFLOW
);
5028 // Do a simple pc-relative relocation at unaligned addresses.
5030 template<int valsize
>
5031 static inline typename
This::Status
5032 pcrela_ua(unsigned char* view
,
5033 const Sized_relobj_file
<size
, big_endian
>* object
,
5034 const Symbol_value
<size
>* psymval
,
5035 AArch64_valtype addend
,
5037 const AArch64_reloc_property
* reloc_property
)
5039 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5041 Address x
= psymval
->value(object
, addend
) - address
;
5042 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5043 static_cast<Valtype
>(x
));
5044 return (reloc_property
->checkup_x_value(x
)
5046 : This::STATUS_OVERFLOW
);
5049 // Do a simple rela relocation at aligned addresses.
5051 template<int valsize
>
5052 static inline typename
This::Status
5054 unsigned char* view
,
5055 const Sized_relobj_file
<size
, big_endian
>* object
,
5056 const Symbol_value
<size
>* psymval
,
5057 AArch64_valtype addend
,
5058 const AArch64_reloc_property
* reloc_property
)
5060 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5061 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5062 Address x
= psymval
->value(object
, addend
);
5063 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5064 return (reloc_property
->checkup_x_value(x
)
5066 : This::STATUS_OVERFLOW
);
5069 // Do relocate. Update selected bits in text.
5070 // new_val = (val & ~dst_mask) | (immed << doffset)
5072 template<int valsize
>
5073 static inline typename
This::Status
5074 rela_general(unsigned char* view
,
5075 const Sized_relobj_file
<size
, big_endian
>* object
,
5076 const Symbol_value
<size
>* psymval
,
5077 AArch64_valtype addend
,
5078 const AArch64_reloc_property
* reloc_property
)
5080 // Calculate relocation.
5081 Address x
= psymval
->value(object
, addend
);
5082 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5085 // Do relocate. Update selected bits in text.
5086 // new val = (val & ~dst_mask) | (immed << doffset)
5088 template<int valsize
>
5089 static inline typename
This::Status
5091 unsigned char* view
,
5093 AArch64_valtype addend
,
5094 const AArch64_reloc_property
* reloc_property
)
5096 // Calculate relocation.
5097 Address x
= s
+ addend
;
5098 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5101 // Do address relative relocate. Update selected bits in text.
5102 // new val = (val & ~dst_mask) | (immed << doffset)
5104 template<int valsize
>
5105 static inline typename
This::Status
5107 unsigned char* view
,
5108 const Sized_relobj_file
<size
, big_endian
>* object
,
5109 const Symbol_value
<size
>* psymval
,
5110 AArch64_valtype addend
,
5112 const AArch64_reloc_property
* reloc_property
)
5114 // Calculate relocation.
5115 Address x
= psymval
->value(object
, addend
) - address
;
5116 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5120 // Calculate (S + A) - address, update adr instruction.
5122 static inline typename
This::Status
5123 adr(unsigned char* view
,
5124 const Sized_relobj_file
<size
, big_endian
>* object
,
5125 const Symbol_value
<size
>* psymval
,
5128 const AArch64_reloc_property
* /* reloc_property */)
5130 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5131 // Pick bits [20:0] of X.
5132 AArch64_valtype immed
= x
& 0x1fffff;
5133 update_adr(view
, immed
);
5134 // Check -2^20 <= X < 2^20
5135 return (size
== 64 && Bits
<21>::has_overflow((x
))
5136 ? This::STATUS_OVERFLOW
5137 : This::STATUS_OKAY
);
5140 // Calculate PG(S+A) - PG(address), update adrp instruction.
5141 // R_AARCH64_ADR_PREL_PG_HI21
5143 static inline typename
This::Status
5145 unsigned char* view
,
5149 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5150 // Pick [32:12] of X.
5151 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5152 update_adr(view
, immed
);
5153 // Check -2^32 <= X < 2^32
5154 return (size
== 64 && Bits
<33>::has_overflow((x
))
5155 ? This::STATUS_OVERFLOW
5156 : This::STATUS_OKAY
);
5159 // Calculate PG(S+A) - PG(address), update adrp instruction.
5160 // R_AARCH64_ADR_PREL_PG_HI21
5162 static inline typename
This::Status
5163 adrp(unsigned char* view
,
5164 const Sized_relobj_file
<size
, big_endian
>* object
,
5165 const Symbol_value
<size
>* psymval
,
5168 const AArch64_reloc_property
* reloc_property
)
5170 Address sa
= psymval
->value(object
, addend
);
5171 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5172 // Pick [32:12] of X.
5173 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5174 update_adr(view
, immed
);
5175 return (reloc_property
->checkup_x_value(x
)
5177 : This::STATUS_OVERFLOW
);
5180 // Update mov[n/z] instruction. Check overflow if needed.
5181 // If X >=0, set the instruction to movz and its immediate value to the
5183 // If X < 0, set the instruction to movn and its immediate value to
5184 // NOT (selected bits of).
5186 static inline typename
This::Status
5187 movnz(unsigned char* view
,
5189 const AArch64_reloc_property
* reloc_property
)
5191 // Select bits from X.
5194 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5195 if (static_cast<SignedW
>(x
) >= 0)
5197 immed
= reloc_property
->select_x_value(x
);
5202 immed
= reloc_property
->select_x_value(~x
);;
5206 // Update movnz instruction.
5207 update_movnz(view
, immed
, is_movz
);
5209 // Do check overflow or alignment if needed.
5210 return (reloc_property
->checkup_x_value(x
)
5212 : This::STATUS_OVERFLOW
);
5216 maybe_apply_stub(unsigned int,
5217 const The_relocate_info
*,
5221 const Sized_symbol
<size
>*,
5222 const Symbol_value
<size
>*,
5223 const Sized_relobj_file
<size
, big_endian
>*,
5226 }; // End of AArch64_relocate_functions
5229 // For a certain relocation type (usually jump/branch), test to see if the
5230 // destination needs a stub to fulfil. If so, re-route the destination of the
5231 // original instruction to the stub, note, at this time, the stub has already
5234 template<int size
, bool big_endian
>
5236 AArch64_relocate_functions
<size
, big_endian
>::
5237 maybe_apply_stub(unsigned int r_type
,
5238 const The_relocate_info
* relinfo
,
5239 const The_rela
& rela
,
5240 unsigned char* view
,
5242 const Sized_symbol
<size
>* gsym
,
5243 const Symbol_value
<size
>* psymval
,
5244 const Sized_relobj_file
<size
, big_endian
>* object
,
5245 section_size_type current_group_size
)
5247 if (parameters
->options().relocatable())
5250 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5251 Address branch_target
= psymval
->value(object
, 0) + addend
;
5253 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5254 if (stub_type
== ST_NONE
)
5257 const The_aarch64_relobj
* aarch64_relobj
=
5258 static_cast<const The_aarch64_relobj
*>(object
);
5259 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5260 gold_assert(stub_table
!= NULL
);
5262 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5263 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5264 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5265 gold_assert(stub
!= NULL
);
5267 Address new_branch_target
= stub_table
->address() + stub
->offset();
5268 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5269 new_branch_target
- address
;
5270 const AArch64_reloc_property
* arp
=
5271 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5272 gold_assert(arp
!= NULL
);
5273 typename
This::Status status
= This::template
5274 rela_general
<32>(view
, branch_offset
, 0, arp
);
5275 if (status
!= This::STATUS_OKAY
)
5276 gold_error(_("Stub is too far away, try a smaller value "
5277 "for '--stub-group-size'. The current value is 0x%lx."),
5278 static_cast<unsigned long>(current_group_size
));
5283 // Group input sections for stub generation.
5285 // We group input sections in an output section so that the total size,
5286 // including any padding space due to alignment is smaller than GROUP_SIZE
5287 // unless the only input section in group is bigger than GROUP_SIZE already.
5288 // Then an ARM stub table is created to follow the last input section
5289 // in group. For each group an ARM stub table is created an is placed
5290 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5291 // extend the group after the stub table.
5293 template<int size
, bool big_endian
>
5295 Target_aarch64
<size
, big_endian
>::group_sections(
5297 section_size_type group_size
,
5298 bool stubs_always_after_branch
,
5301 // Group input sections and insert stub table
5302 Layout::Section_list section_list
;
5303 layout
->get_executable_sections(§ion_list
);
5304 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5305 p
!= section_list
.end();
5308 AArch64_output_section
<size
, big_endian
>* output_section
=
5309 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5310 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5316 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5317 // section of RELOBJ.
5319 template<int size
, bool big_endian
>
5320 AArch64_input_section
<size
, big_endian
>*
5321 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5322 Relobj
* relobj
, unsigned int shndx
) const
5324 Section_id
sid(relobj
, shndx
);
5325 typename
AArch64_input_section_map::const_iterator p
=
5326 this->aarch64_input_section_map_
.find(sid
);
5327 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5331 // Make a new AArch64_input_section object.
5333 template<int size
, bool big_endian
>
5334 AArch64_input_section
<size
, big_endian
>*
5335 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5336 Relobj
* relobj
, unsigned int shndx
)
5338 Section_id
sid(relobj
, shndx
);
5340 AArch64_input_section
<size
, big_endian
>* input_section
=
5341 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5342 input_section
->init();
5344 // Register new AArch64_input_section in map for look-up.
5345 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5346 this->aarch64_input_section_map_
.insert(
5347 std::make_pair(sid
, input_section
));
5349 // Make sure that it we have not created another AArch64_input_section
5350 // for this input section already.
5351 gold_assert(ins
.second
);
5353 return input_section
;
5357 // Relaxation hook. This is where we do stub generation.
5359 template<int size
, bool big_endian
>
5361 Target_aarch64
<size
, big_endian
>::do_relax(
5363 const Input_objects
* input_objects
,
5364 Symbol_table
* symtab
,
5368 gold_assert(!parameters
->options().relocatable());
5371 // We don't handle negative stub_group_size right now.
5372 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5373 if (this->stub_group_size_
== 1)
5375 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5376 // will fail to link. The user will have to relink with an explicit
5377 // group size option.
5378 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5381 group_sections(layout
, this->stub_group_size_
, true, task
);
5385 // If this is not the first pass, addresses and file offsets have
5386 // been reset at this point, set them here.
5387 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5388 sp
!= this->stub_tables_
.end(); ++sp
)
5390 The_stub_table
* stt
= *sp
;
5391 The_aarch64_input_section
* owner
= stt
->owner();
5392 off_t off
= align_address(owner
->original_size(),
5394 stt
->set_address_and_file_offset(owner
->address() + off
,
5395 owner
->offset() + off
);
5399 // Scan relocs for relocation stubs
5400 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5401 op
!= input_objects
->relobj_end();
5404 The_aarch64_relobj
* aarch64_relobj
=
5405 static_cast<The_aarch64_relobj
*>(*op
);
5406 // Lock the object so we can read from it. This is only called
5407 // single-threaded from Layout::finalize, so it is OK to lock.
5408 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5409 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5412 bool any_stub_table_changed
= false;
5413 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5414 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5416 The_stub_table
* stub_table
= *siter
;
5417 if (stub_table
->update_data_size_changed_p())
5419 The_aarch64_input_section
* owner
= stub_table
->owner();
5420 uint64_t address
= owner
->address();
5421 off_t offset
= owner
->offset();
5422 owner
->reset_address_and_file_offset();
5423 owner
->set_address_and_file_offset(address
, offset
);
5425 any_stub_table_changed
= true;
5429 // Do not continue relaxation.
5430 bool continue_relaxation
= any_stub_table_changed
;
5431 if (!continue_relaxation
)
5432 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5433 (sp
!= this->stub_tables_
.end());
5435 (*sp
)->finalize_stubs();
5437 return continue_relaxation
;
5441 // Make a new Stub_table.
5443 template<int size
, bool big_endian
>
5444 Stub_table
<size
, big_endian
>*
5445 Target_aarch64
<size
, big_endian
>::new_stub_table(
5446 AArch64_input_section
<size
, big_endian
>* owner
)
5448 Stub_table
<size
, big_endian
>* stub_table
=
5449 new Stub_table
<size
, big_endian
>(owner
);
5450 stub_table
->set_address(align_address(
5451 owner
->address() + owner
->data_size(), 8));
5452 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5453 stub_table
->finalize_data_size();
5455 this->stub_tables_
.push_back(stub_table
);
5461 template<int size
, bool big_endian
>
5463 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5464 void* arg
, unsigned int r_type
, uint64_t) const
5466 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5467 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5468 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5469 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5470 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5471 gold_assert(psymval
->is_tls_symbol());
5472 // The value of a TLS symbol is the offset in the TLS segment.
5473 return psymval
->value(ti
.object
, 0);
5476 // Return the number of entries in the PLT.
5478 template<int size
, bool big_endian
>
5480 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5482 if (this->plt_
== NULL
)
5484 return this->plt_
->entry_count();
5487 // Return the offset of the first non-reserved PLT entry.
5489 template<int size
, bool big_endian
>
5491 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5493 return this->plt_
->first_plt_entry_offset();
5496 // Return the size of each PLT entry.
5498 template<int size
, bool big_endian
>
5500 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5502 return this->plt_
->get_plt_entry_size();
5505 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5507 template<int size
, bool big_endian
>
5509 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5510 Symbol_table
* symtab
, Layout
* layout
)
5512 if (this->tls_base_symbol_defined_
)
5515 Output_segment
* tls_segment
= layout
->tls_segment();
5516 if (tls_segment
!= NULL
)
5518 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5519 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5520 Symbol_table::PREDEFINED
,
5524 elfcpp::STV_HIDDEN
, 0,
5525 Symbol::SEGMENT_START
,
5528 this->tls_base_symbol_defined_
= true;
5531 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5533 template<int size
, bool big_endian
>
5535 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5536 Symbol_table
* symtab
, Layout
* layout
)
5538 if (this->plt_
== NULL
)
5539 this->make_plt_section(symtab
, layout
);
5541 if (!this->plt_
->has_tlsdesc_entry())
5543 // Allocate the TLSDESC_GOT entry.
5544 Output_data_got_aarch64
<size
, big_endian
>* got
=
5545 this->got_section(symtab
, layout
);
5546 unsigned int got_offset
= got
->add_constant(0);
5548 // Allocate the TLSDESC_PLT entry.
5549 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5553 // Create a GOT entry for the TLS module index.
5555 template<int size
, bool big_endian
>
5557 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5558 Symbol_table
* symtab
, Layout
* layout
,
5559 Sized_relobj_file
<size
, big_endian
>* object
)
5561 if (this->got_mod_index_offset_
== -1U)
5563 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5564 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5565 Output_data_got_aarch64
<size
, big_endian
>* got
=
5566 this->got_section(symtab
, layout
);
5567 unsigned int got_offset
= got
->add_constant(0);
5568 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5570 got
->add_constant(0);
5571 this->got_mod_index_offset_
= got_offset
;
5573 return this->got_mod_index_offset_
;
5576 // Optimize the TLS relocation type based on what we know about the
5577 // symbol. IS_FINAL is true if the final address of this symbol is
5578 // known at link time.
5580 template<int size
, bool big_endian
>
5581 tls::Tls_optimization
5582 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5585 // If we are generating a shared library, then we can't do anything
5587 if (parameters
->options().shared())
5588 return tls::TLSOPT_NONE
;
5592 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5593 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5594 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5595 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5596 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5597 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5598 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5599 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5600 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5601 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5602 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5603 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5604 // These are General-Dynamic which permits fully general TLS
5605 // access. Since we know that we are generating an executable,
5606 // we can convert this to Initial-Exec. If we also know that
5607 // this is a local symbol, we can further switch to Local-Exec.
5609 return tls::TLSOPT_TO_LE
;
5610 return tls::TLSOPT_TO_IE
;
5612 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5613 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5614 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5615 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5616 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5617 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5618 // These are Local-Dynamic, which refer to local symbols in the
5619 // dynamic TLS block. Since we know that we generating an
5620 // executable, we can switch to Local-Exec.
5621 return tls::TLSOPT_TO_LE
;
5623 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5624 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5625 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5626 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5627 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5628 // These are Initial-Exec relocs which get the thread offset
5629 // from the GOT. If we know that we are linking against the
5630 // local symbol, we can switch to Local-Exec, which links the
5631 // thread offset into the instruction.
5633 return tls::TLSOPT_TO_LE
;
5634 return tls::TLSOPT_NONE
;
5636 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5637 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5638 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5639 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5640 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5641 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5642 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5643 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5644 // When we already have Local-Exec, there is nothing further we
5646 return tls::TLSOPT_NONE
;
5653 // Returns true if this relocation type could be that of a function pointer.
5655 template<int size
, bool big_endian
>
5657 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5658 unsigned int r_type
)
5662 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5663 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5664 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5665 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5666 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5674 // For safe ICF, scan a relocation for a local symbol to check if it
5675 // corresponds to a function pointer being taken. In that case mark
5676 // the function whose pointer was taken as not foldable.
5678 template<int size
, bool big_endian
>
5680 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5683 Target_aarch64
<size
, big_endian
>* ,
5684 Sized_relobj_file
<size
, big_endian
>* ,
5687 const elfcpp::Rela
<size
, big_endian
>& ,
5688 unsigned int r_type
,
5689 const elfcpp::Sym
<size
, big_endian
>&)
5691 // When building a shared library, do not fold any local symbols.
5692 return (parameters
->options().shared()
5693 || possible_function_pointer_reloc(r_type
));
5696 // For safe ICF, scan a relocation for a global symbol to check if it
5697 // corresponds to a function pointer being taken. In that case mark
5698 // the function whose pointer was taken as not foldable.
5700 template<int size
, bool big_endian
>
5702 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5705 Target_aarch64
<size
, big_endian
>* ,
5706 Sized_relobj_file
<size
, big_endian
>* ,
5709 const elfcpp::Rela
<size
, big_endian
>& ,
5710 unsigned int r_type
,
5713 // When building a shared library, do not fold symbols whose visibility
5714 // is hidden, internal or protected.
5715 return ((parameters
->options().shared()
5716 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5717 || gsym
->visibility() == elfcpp::STV_PROTECTED
5718 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5719 || possible_function_pointer_reloc(r_type
));
5722 // Report an unsupported relocation against a local symbol.
5724 template<int size
, bool big_endian
>
5726 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
5727 Sized_relobj_file
<size
, big_endian
>* object
,
5728 unsigned int r_type
)
5730 gold_error(_("%s: unsupported reloc %u against local symbol"),
5731 object
->name().c_str(), r_type
);
5734 // We are about to emit a dynamic relocation of type R_TYPE. If the
5735 // dynamic linker does not support it, issue an error.
5737 template<int size
, bool big_endian
>
5739 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
5740 unsigned int r_type
)
5742 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
5746 // These are the relocation types supported by glibc for AARCH64.
5747 case elfcpp::R_AARCH64_NONE
:
5748 case elfcpp::R_AARCH64_COPY
:
5749 case elfcpp::R_AARCH64_GLOB_DAT
:
5750 case elfcpp::R_AARCH64_JUMP_SLOT
:
5751 case elfcpp::R_AARCH64_RELATIVE
:
5752 case elfcpp::R_AARCH64_TLS_DTPREL64
:
5753 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
5754 case elfcpp::R_AARCH64_TLS_TPREL64
:
5755 case elfcpp::R_AARCH64_TLSDESC
:
5756 case elfcpp::R_AARCH64_IRELATIVE
:
5757 case elfcpp::R_AARCH64_ABS32
:
5758 case elfcpp::R_AARCH64_ABS64
:
5765 // This prevents us from issuing more than one error per reloc
5766 // section. But we can still wind up issuing more than one
5767 // error per object file.
5768 if (this->issued_non_pic_error_
)
5770 gold_assert(parameters
->options().output_is_position_independent());
5771 object
->error(_("requires unsupported dynamic reloc; "
5772 "recompile with -fPIC"));
5773 this->issued_non_pic_error_
= true;
5777 // Return whether we need to make a PLT entry for a relocation of the
5778 // given type against a STT_GNU_IFUNC symbol.
5780 template<int size
, bool big_endian
>
5782 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
5783 Sized_relobj_file
<size
, big_endian
>* object
,
5784 unsigned int r_type
)
5786 const AArch64_reloc_property
* arp
=
5787 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5788 gold_assert(arp
!= NULL
);
5790 int flags
= arp
->reference_flags();
5791 if (flags
& Symbol::TLS_REF
)
5793 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5794 object
->name().c_str(), arp
->name().c_str());
5800 // Scan a relocation for a local symbol.
5802 template<int size
, bool big_endian
>
5804 Target_aarch64
<size
, big_endian
>::Scan::local(
5805 Symbol_table
* symtab
,
5807 Target_aarch64
<size
, big_endian
>* target
,
5808 Sized_relobj_file
<size
, big_endian
>* object
,
5809 unsigned int data_shndx
,
5810 Output_section
* output_section
,
5811 const elfcpp::Rela
<size
, big_endian
>& rela
,
5812 unsigned int r_type
,
5813 const elfcpp::Sym
<size
, big_endian
>& lsym
,
5819 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
5821 Output_data_got_aarch64
<size
, big_endian
>* got
=
5822 target
->got_section(symtab
, layout
);
5823 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5825 // A local STT_GNU_IFUNC symbol may require a PLT entry.
5826 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
5827 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
5828 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
5832 case elfcpp::R_AARCH64_ABS32
:
5833 case elfcpp::R_AARCH64_ABS16
:
5834 if (parameters
->options().output_is_position_independent())
5836 gold_error(_("%s: unsupported reloc %u in pos independent link."),
5837 object
->name().c_str(), r_type
);
5841 case elfcpp::R_AARCH64_ABS64
:
5842 // If building a shared library or pie, we need to mark this as a dynmic
5843 // reloction, so that the dynamic loader can relocate it.
5844 if (parameters
->options().output_is_position_independent())
5846 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
5847 rela_dyn
->add_local_relative(object
, r_sym
,
5848 elfcpp::R_AARCH64_RELATIVE
,
5851 rela
.get_r_offset(),
5852 rela
.get_r_addend(),
5857 case elfcpp::R_AARCH64_PREL64
:
5858 case elfcpp::R_AARCH64_PREL32
:
5859 case elfcpp::R_AARCH64_PREL16
:
5862 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
5863 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
5864 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
5865 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
5866 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
5867 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
5868 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
5869 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
5870 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
5871 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
5874 // Control flow, pc-relative. We don't need to do anything for a relative
5875 // addressing relocation against a local symbol if it does not reference
5877 case elfcpp::R_AARCH64_TSTBR14
:
5878 case elfcpp::R_AARCH64_CONDBR19
:
5879 case elfcpp::R_AARCH64_JUMP26
:
5880 case elfcpp::R_AARCH64_CALL26
:
5883 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5884 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5886 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5887 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5888 if (tlsopt
== tls::TLSOPT_TO_LE
)
5891 layout
->set_has_static_tls();
5892 // Create a GOT entry for the tp-relative offset.
5893 if (!parameters
->doing_static_link())
5895 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
5896 target
->rela_dyn_section(layout
),
5897 elfcpp::R_AARCH64_TLS_TPREL64
);
5899 else if (!object
->local_has_got_offset(r_sym
,
5900 GOT_TYPE_TLS_OFFSET
))
5902 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
5903 unsigned int got_offset
=
5904 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
5905 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
5906 gold_assert(addend
== 0);
5907 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
5913 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5914 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5916 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5917 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5918 if (tlsopt
== tls::TLSOPT_TO_LE
)
5920 layout
->set_has_static_tls();
5923 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
5925 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
5927 target
->rela_dyn_section(layout
),
5928 elfcpp::R_AARCH64_TLS_DTPMOD64
);
5932 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5933 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5934 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5935 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5936 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5937 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5938 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5939 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5941 layout
->set_has_static_tls();
5942 bool output_is_shared
= parameters
->options().shared();
5943 if (output_is_shared
)
5944 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
5945 object
->name().c_str(), r_type
);
5949 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5950 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5952 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5953 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5954 if (tlsopt
== tls::TLSOPT_NONE
)
5956 // Create a GOT entry for the module index.
5957 target
->got_mod_index_entry(symtab
, layout
, object
);
5959 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
5960 unsupported_reloc_local(object
, r_type
);
5964 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5965 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5966 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5967 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5970 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5971 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5972 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5974 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5975 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5976 target
->define_tls_base_symbol(symtab
, layout
);
5977 if (tlsopt
== tls::TLSOPT_NONE
)
5979 // Create reserved PLT and GOT entries for the resolver.
5980 target
->reserve_tlsdesc_entries(symtab
, layout
);
5982 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
5983 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
5984 // entry needs to be in an area in .got.plt, not .got. Call
5985 // got_section to make sure the section has been created.
5986 target
->got_section(symtab
, layout
);
5987 Output_data_got
<size
, big_endian
>* got
=
5988 target
->got_tlsdesc_section();
5989 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5990 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
5992 unsigned int got_offset
= got
->add_constant(0);
5993 got
->add_constant(0);
5994 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
5996 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
5997 // We store the arguments we need in a vector, and use
5998 // the index into the vector as the parameter to pass
5999 // to the target specific routines.
6000 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
6001 void* arg
= reinterpret_cast<void*>(intarg
);
6002 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
6003 got
, got_offset
, 0);
6006 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6007 unsupported_reloc_local(object
, r_type
);
6011 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6015 unsupported_reloc_local(object
, r_type
);
6020 // Report an unsupported relocation against a global symbol.
6022 template<int size
, bool big_endian
>
6024 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6025 Sized_relobj_file
<size
, big_endian
>* object
,
6026 unsigned int r_type
,
6029 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6030 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6033 template<int size
, bool big_endian
>
6035 Target_aarch64
<size
, big_endian
>::Scan::global(
6036 Symbol_table
* symtab
,
6038 Target_aarch64
<size
, big_endian
>* target
,
6039 Sized_relobj_file
<size
, big_endian
> * object
,
6040 unsigned int data_shndx
,
6041 Output_section
* output_section
,
6042 const elfcpp::Rela
<size
, big_endian
>& rela
,
6043 unsigned int r_type
,
6046 // A STT_GNU_IFUNC symbol may require a PLT entry.
6047 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6048 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6049 target
->make_plt_entry(symtab
, layout
, gsym
);
6051 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6053 const AArch64_reloc_property
* arp
=
6054 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6055 gold_assert(arp
!= NULL
);
6059 case elfcpp::R_AARCH64_ABS16
:
6060 case elfcpp::R_AARCH64_ABS32
:
6061 case elfcpp::R_AARCH64_ABS64
:
6063 // Make a PLT entry if necessary.
6064 if (gsym
->needs_plt_entry())
6066 target
->make_plt_entry(symtab
, layout
, gsym
);
6067 // Since this is not a PC-relative relocation, we may be
6068 // taking the address of a function. In that case we need to
6069 // set the entry in the dynamic symbol table to the address of
6071 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6072 gsym
->set_needs_dynsym_value();
6074 // Make a dynamic relocation if necessary.
6075 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6077 if (!parameters
->options().output_is_position_independent()
6078 && gsym
->may_need_copy_reloc())
6080 target
->copy_reloc(symtab
, layout
, object
,
6081 data_shndx
, output_section
, gsym
, rela
);
6083 else if (r_type
== elfcpp::R_AARCH64_ABS64
6084 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6085 && gsym
->can_use_relative_reloc(false)
6086 && !gsym
->is_from_dynobj()
6087 && !gsym
->is_undefined()
6088 && !gsym
->is_preemptible())
6090 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6091 // symbol. This makes a function address in a PIE executable
6092 // match the address in a shared library that it links against.
6093 Reloc_section
* rela_dyn
=
6094 target
->rela_irelative_section(layout
);
6095 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6096 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6097 output_section
, object
,
6099 rela
.get_r_offset(),
6100 rela
.get_r_addend());
6102 else if (r_type
== elfcpp::R_AARCH64_ABS64
6103 && gsym
->can_use_relative_reloc(false))
6105 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6106 rela_dyn
->add_global_relative(gsym
,
6107 elfcpp::R_AARCH64_RELATIVE
,
6111 rela
.get_r_offset(),
6112 rela
.get_r_addend(),
6117 check_non_pic(object
, r_type
);
6118 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6119 rela_dyn
= target
->rela_dyn_section(layout
);
6120 rela_dyn
->add_global(
6121 gsym
, r_type
, output_section
, object
,
6122 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6128 case elfcpp::R_AARCH64_PREL16
:
6129 case elfcpp::R_AARCH64_PREL32
:
6130 case elfcpp::R_AARCH64_PREL64
:
6131 // This is used to fill the GOT absolute address.
6132 if (gsym
->needs_plt_entry())
6134 target
->make_plt_entry(symtab
, layout
, gsym
);
6138 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6139 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6140 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6141 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6142 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6143 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6144 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6145 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6146 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6147 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6149 if (gsym
->needs_plt_entry())
6150 target
->make_plt_entry(symtab
, layout
, gsym
);
6151 // Make a dynamic relocation if necessary.
6152 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6154 if (parameters
->options().output_is_executable()
6155 && gsym
->may_need_copy_reloc())
6157 target
->copy_reloc(symtab
, layout
, object
,
6158 data_shndx
, output_section
, gsym
, rela
);
6164 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6165 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6167 // This pair of relocations is used to access a specific GOT entry.
6168 // Note a GOT entry is an *address* to a symbol.
6169 // The symbol requires a GOT entry
6170 Output_data_got_aarch64
<size
, big_endian
>* got
=
6171 target
->got_section(symtab
, layout
);
6172 if (gsym
->final_value_is_known())
6174 // For a STT_GNU_IFUNC symbol we want the PLT address.
6175 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6176 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6178 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6182 // If this symbol is not fully resolved, we need to add a dynamic
6183 // relocation for it.
6184 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6186 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6188 // 1) The symbol may be defined in some other module.
6189 // 2) We are building a shared library and this is a protected
6190 // symbol; using GLOB_DAT means that the dynamic linker can use
6191 // the address of the PLT in the main executable when appropriate
6192 // so that function address comparisons work.
6193 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6194 // again so that function address comparisons work.
6195 if (gsym
->is_from_dynobj()
6196 || gsym
->is_undefined()
6197 || gsym
->is_preemptible()
6198 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6199 && parameters
->options().shared())
6200 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6201 && parameters
->options().output_is_position_independent()))
6202 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6203 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6206 // For a STT_GNU_IFUNC symbol we want to write the PLT
6207 // offset into the GOT, so that function pointer
6208 // comparisons work correctly.
6210 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6211 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6214 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6215 // Tell the dynamic linker to use the PLT address
6216 // when resolving relocations.
6217 if (gsym
->is_from_dynobj()
6218 && !parameters
->options().shared())
6219 gsym
->set_needs_dynsym_value();
6223 rela_dyn
->add_global_relative(
6224 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6226 gsym
->got_offset(GOT_TYPE_STANDARD
),
6235 case elfcpp::R_AARCH64_TSTBR14
:
6236 case elfcpp::R_AARCH64_CONDBR19
:
6237 case elfcpp::R_AARCH64_JUMP26
:
6238 case elfcpp::R_AARCH64_CALL26
:
6240 if (gsym
->final_value_is_known())
6243 if (gsym
->is_defined() &&
6244 !gsym
->is_from_dynobj() &&
6245 !gsym
->is_preemptible())
6248 // Make plt entry for function call.
6249 target
->make_plt_entry(symtab
, layout
, gsym
);
6253 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6254 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6256 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6257 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6258 if (tlsopt
== tls::TLSOPT_TO_LE
)
6260 layout
->set_has_static_tls();
6263 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6266 Output_data_got_aarch64
<size
, big_endian
>* got
=
6267 target
->got_section(symtab
, layout
);
6268 // Create 2 consecutive entries for module index and offset.
6269 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6270 target
->rela_dyn_section(layout
),
6271 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6272 elfcpp::R_AARCH64_TLS_DTPREL64
);
6276 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6277 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6279 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6280 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6281 if (tlsopt
== tls::TLSOPT_NONE
)
6283 // Create a GOT entry for the module index.
6284 target
->got_mod_index_entry(symtab
, layout
, object
);
6286 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6287 unsupported_reloc_local(object
, r_type
);
6291 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6292 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6293 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6294 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6297 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6298 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6300 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6301 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6302 if (tlsopt
== tls::TLSOPT_TO_LE
)
6305 layout
->set_has_static_tls();
6306 // Create a GOT entry for the tp-relative offset.
6307 Output_data_got_aarch64
<size
, big_endian
>* got
6308 = target
->got_section(symtab
, layout
);
6309 if (!parameters
->doing_static_link())
6311 got
->add_global_with_rel(
6312 gsym
, GOT_TYPE_TLS_OFFSET
,
6313 target
->rela_dyn_section(layout
),
6314 elfcpp::R_AARCH64_TLS_TPREL64
);
6316 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6318 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6319 unsigned int got_offset
=
6320 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6321 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6322 gold_assert(addend
== 0);
6323 got
->add_static_reloc(got_offset
,
6324 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6329 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6330 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6331 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6332 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6333 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6334 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6335 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6336 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6337 layout
->set_has_static_tls();
6338 if (parameters
->options().shared())
6339 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6340 object
->name().c_str(), r_type
);
6343 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6344 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6345 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6347 target
->define_tls_base_symbol(symtab
, layout
);
6348 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6349 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6350 if (tlsopt
== tls::TLSOPT_NONE
)
6352 // Create reserved PLT and GOT entries for the resolver.
6353 target
->reserve_tlsdesc_entries(symtab
, layout
);
6355 // Create a double GOT entry with an R_AARCH64_TLSDESC
6356 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6357 // entry needs to be in an area in .got.plt, not .got. Call
6358 // got_section to make sure the section has been created.
6359 target
->got_section(symtab
, layout
);
6360 Output_data_got
<size
, big_endian
>* got
=
6361 target
->got_tlsdesc_section();
6362 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6363 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6364 elfcpp::R_AARCH64_TLSDESC
, 0);
6366 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6368 // Create a GOT entry for the tp-relative offset.
6369 Output_data_got
<size
, big_endian
>* got
6370 = target
->got_section(symtab
, layout
);
6371 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6372 target
->rela_dyn_section(layout
),
6373 elfcpp::R_AARCH64_TLS_TPREL64
);
6375 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6376 unsupported_reloc_global(object
, r_type
, gsym
);
6380 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6384 gold_error(_("%s: unsupported reloc type in global scan"),
6385 aarch64_reloc_property_table
->
6386 reloc_name_in_error_message(r_type
).c_str());
6389 } // End of Scan::global
6392 // Create the PLT section.
6393 template<int size
, bool big_endian
>
6395 Target_aarch64
<size
, big_endian
>::make_plt_section(
6396 Symbol_table
* symtab
, Layout
* layout
)
6398 if (this->plt_
== NULL
)
6400 // Create the GOT section first.
6401 this->got_section(symtab
, layout
);
6403 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6404 this->got_irelative_
);
6406 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6408 | elfcpp::SHF_EXECINSTR
),
6409 this->plt_
, ORDER_PLT
, false);
6411 // Make the sh_info field of .rela.plt point to .plt.
6412 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6413 rela_plt_os
->set_info_section(this->plt_
->output_section());
6417 // Return the section for TLSDESC relocations.
6419 template<int size
, bool big_endian
>
6420 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6421 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6423 return this->plt_section()->rela_tlsdesc(layout
);
6426 // Create a PLT entry for a global symbol.
6428 template<int size
, bool big_endian
>
6430 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6431 Symbol_table
* symtab
,
6435 if (gsym
->has_plt_offset())
6438 if (this->plt_
== NULL
)
6439 this->make_plt_section(symtab
, layout
);
6441 this->plt_
->add_entry(symtab
, layout
, gsym
);
6444 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6446 template<int size
, bool big_endian
>
6448 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6449 Symbol_table
* symtab
, Layout
* layout
,
6450 Sized_relobj_file
<size
, big_endian
>* relobj
,
6451 unsigned int local_sym_index
)
6453 if (relobj
->local_has_plt_offset(local_sym_index
))
6455 if (this->plt_
== NULL
)
6456 this->make_plt_section(symtab
, layout
);
6457 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6460 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6463 template<int size
, bool big_endian
>
6465 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6466 Symbol_table
* symtab
,
6468 Sized_relobj_file
<size
, big_endian
>* object
,
6469 unsigned int data_shndx
,
6470 unsigned int sh_type
,
6471 const unsigned char* prelocs
,
6473 Output_section
* output_section
,
6474 bool needs_special_offset_handling
,
6475 size_t local_symbol_count
,
6476 const unsigned char* plocal_symbols
)
6478 if (sh_type
== elfcpp::SHT_REL
)
6483 gold::gc_process_relocs
<
6485 Target_aarch64
<size
, big_endian
>,
6487 typename Target_aarch64
<size
, big_endian
>::Scan
,
6488 typename Target_aarch64
<size
, big_endian
>::Relocatable_size_for_reloc
>(
6497 needs_special_offset_handling
,
6502 // Scan relocations for a section.
6504 template<int size
, bool big_endian
>
6506 Target_aarch64
<size
, big_endian
>::scan_relocs(
6507 Symbol_table
* symtab
,
6509 Sized_relobj_file
<size
, big_endian
>* object
,
6510 unsigned int data_shndx
,
6511 unsigned int sh_type
,
6512 const unsigned char* prelocs
,
6514 Output_section
* output_section
,
6515 bool needs_special_offset_handling
,
6516 size_t local_symbol_count
,
6517 const unsigned char* plocal_symbols
)
6519 if (sh_type
== elfcpp::SHT_REL
)
6521 gold_error(_("%s: unsupported REL reloc section"),
6522 object
->name().c_str());
6525 gold::scan_relocs
<size
, big_endian
, Target_aarch64
, elfcpp::SHT_RELA
, Scan
>(
6534 needs_special_offset_handling
,
6539 // Return the value to use for a dynamic which requires special
6540 // treatment. This is how we support equality comparisons of function
6541 // pointers across shared library boundaries, as described in the
6542 // processor specific ABI supplement.
6544 template<int size
, bool big_endian
>
6546 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6548 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6549 return this->plt_address_for_global(gsym
);
6553 // Finalize the sections.
6555 template<int size
, bool big_endian
>
6557 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6559 const Input_objects
*,
6560 Symbol_table
* symtab
)
6562 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6564 : this->plt_
->rela_plt());
6565 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6566 this->rela_dyn_
, true, false);
6568 // Emit any relocs we saved in an attempt to avoid generating COPY
6570 if (this->copy_relocs_
.any_saved_relocs())
6571 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6573 // Fill in some more dynamic tags.
6574 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6577 if (this->plt_
!= NULL
6578 && this->plt_
->output_section() != NULL
6579 && this->plt_
->has_tlsdesc_entry())
6581 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6582 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6583 this->got_
->finalize_data_size();
6584 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6585 this->plt_
, plt_offset
);
6586 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6587 this->got_
, got_offset
);
6591 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6592 // the .got.plt section.
6593 Symbol
* sym
= this->global_offset_table_
;
6596 uint64_t data_size
= this->got_plt_
->current_data_size();
6597 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6599 // If the .got section is more than 0x8000 bytes, we add
6600 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6601 // bit relocations have a greater chance of working.
6602 if (data_size
>= 0x8000)
6603 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6604 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6607 if (parameters
->doing_static_link()
6608 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6610 // If linking statically, make sure that the __rela_iplt symbols
6611 // were defined if necessary, even if we didn't create a PLT.
6612 static const Define_symbol_in_segment syms
[] =
6615 "__rela_iplt_start", // name
6616 elfcpp::PT_LOAD
, // segment_type
6617 elfcpp::PF_W
, // segment_flags_set
6618 elfcpp::PF(0), // segment_flags_clear
6621 elfcpp::STT_NOTYPE
, // type
6622 elfcpp::STB_GLOBAL
, // binding
6623 elfcpp::STV_HIDDEN
, // visibility
6625 Symbol::SEGMENT_START
, // offset_from_base
6629 "__rela_iplt_end", // name
6630 elfcpp::PT_LOAD
, // segment_type
6631 elfcpp::PF_W
, // segment_flags_set
6632 elfcpp::PF(0), // segment_flags_clear
6635 elfcpp::STT_NOTYPE
, // type
6636 elfcpp::STB_GLOBAL
, // binding
6637 elfcpp::STV_HIDDEN
, // visibility
6639 Symbol::SEGMENT_START
, // offset_from_base
6644 symtab
->define_symbols(layout
, 2, syms
,
6645 layout
->script_options()->saw_sections_clause());
6651 // Perform a relocation.
6653 template<int size
, bool big_endian
>
6655 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
6656 const Relocate_info
<size
, big_endian
>* relinfo
,
6657 Target_aarch64
<size
, big_endian
>* target
,
6660 const elfcpp::Rela
<size
, big_endian
>& rela
,
6661 unsigned int r_type
,
6662 const Sized_symbol
<size
>* gsym
,
6663 const Symbol_value
<size
>* psymval
,
6664 unsigned char* view
,
6665 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
6666 section_size_type
/* view_size */)
6671 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
6673 const AArch64_reloc_property
* reloc_property
=
6674 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6676 if (reloc_property
== NULL
)
6678 std::string reloc_name
=
6679 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
6680 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6681 _("cannot relocate %s in object file"),
6682 reloc_name
.c_str());
6686 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6688 // Pick the value to use for symbols defined in the PLT.
6689 Symbol_value
<size
> symval
;
6691 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
6693 symval
.set_output_value(target
->plt_address_for_global(gsym
));
6696 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
6698 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6699 if (object
->local_has_plt_offset(r_sym
))
6701 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
6706 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6708 // Get the GOT offset if needed.
6709 // For aarch64, the GOT pointer points to the start of the GOT section.
6710 bool have_got_offset
= false;
6712 int got_base
= (target
->got_
!= NULL
6713 ? (target
->got_
->current_data_size() >= 0x8000
6718 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
6719 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
6720 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
6721 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
6722 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
6723 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
6724 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
6725 case elfcpp::R_AARCH64_GOTREL64
:
6726 case elfcpp::R_AARCH64_GOTREL32
:
6727 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
6728 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
6729 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6730 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6731 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6734 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
6735 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
6739 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6740 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
6741 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
6744 have_got_offset
= true;
6751 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
6752 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
6755 case elfcpp::R_AARCH64_NONE
:
6758 case elfcpp::R_AARCH64_ABS64
:
6759 reloc_status
= Reloc::template rela_ua
<64>(
6760 view
, object
, psymval
, addend
, reloc_property
);
6763 case elfcpp::R_AARCH64_ABS32
:
6764 reloc_status
= Reloc::template rela_ua
<32>(
6765 view
, object
, psymval
, addend
, reloc_property
);
6768 case elfcpp::R_AARCH64_ABS16
:
6769 reloc_status
= Reloc::template rela_ua
<16>(
6770 view
, object
, psymval
, addend
, reloc_property
);
6773 case elfcpp::R_AARCH64_PREL64
:
6774 reloc_status
= Reloc::template pcrela_ua
<64>(
6775 view
, object
, psymval
, addend
, address
, reloc_property
);
6778 case elfcpp::R_AARCH64_PREL32
:
6779 reloc_status
= Reloc::template pcrela_ua
<32>(
6780 view
, object
, psymval
, addend
, address
, reloc_property
);
6783 case elfcpp::R_AARCH64_PREL16
:
6784 reloc_status
= Reloc::template pcrela_ua
<16>(
6785 view
, object
, psymval
, addend
, address
, reloc_property
);
6788 case elfcpp::R_AARCH64_LD_PREL_LO19
:
6789 reloc_status
= Reloc::template pcrela_general
<32>(
6790 view
, object
, psymval
, addend
, address
, reloc_property
);
6793 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
6794 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
6795 address
, reloc_property
);
6798 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
6799 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
6800 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
6804 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
6805 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
6806 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
6807 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
6808 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
6809 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
6810 reloc_status
= Reloc::template rela_general
<32>(
6811 view
, object
, psymval
, addend
, reloc_property
);
6814 case elfcpp::R_AARCH64_CALL26
:
6815 if (this->skip_call_tls_get_addr_
)
6817 // Double check that the TLSGD insn has been optimized away.
6818 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
6819 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
6820 reinterpret_cast<Insntype
*>(view
));
6821 gold_assert((insn
& 0xff000000) == 0x91000000);
6823 reloc_status
= Reloc::STATUS_OKAY
;
6824 this->skip_call_tls_get_addr_
= false;
6825 // Return false to stop further processing this reloc.
6829 case elfcpp::R_AARCH64_JUMP26
:
6830 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
6831 gsym
, psymval
, object
,
6832 target
->stub_group_size_
))
6835 case elfcpp::R_AARCH64_TSTBR14
:
6836 case elfcpp::R_AARCH64_CONDBR19
:
6837 reloc_status
= Reloc::template pcrela_general
<32>(
6838 view
, object
, psymval
, addend
, address
, reloc_property
);
6841 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6842 gold_assert(have_got_offset
);
6843 value
= target
->got_
->address() + got_base
+ got_offset
;
6844 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
6847 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6848 gold_assert(have_got_offset
);
6849 value
= target
->got_
->address() + got_base
+ got_offset
;
6850 reloc_status
= Reloc::template rela_general
<32>(
6851 view
, value
, addend
, reloc_property
);
6854 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6855 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6856 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6857 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6858 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6859 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6860 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6861 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6862 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6863 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6864 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6865 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6866 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6867 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6868 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6869 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6870 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6871 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6872 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6873 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6874 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6875 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6876 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
6877 gsym
, psymval
, view
, address
);
6880 // These are dynamic relocations, which are unexpected when linking.
6881 case elfcpp::R_AARCH64_COPY
:
6882 case elfcpp::R_AARCH64_GLOB_DAT
:
6883 case elfcpp::R_AARCH64_JUMP_SLOT
:
6884 case elfcpp::R_AARCH64_RELATIVE
:
6885 case elfcpp::R_AARCH64_IRELATIVE
:
6886 case elfcpp::R_AARCH64_TLS_DTPREL64
:
6887 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
6888 case elfcpp::R_AARCH64_TLS_TPREL64
:
6889 case elfcpp::R_AARCH64_TLSDESC
:
6890 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6891 _("unexpected reloc %u in object file"),
6896 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6897 _("unsupported reloc %s"),
6898 reloc_property
->name().c_str());
6902 // Report any errors.
6903 switch (reloc_status
)
6905 case Reloc::STATUS_OKAY
:
6907 case Reloc::STATUS_OVERFLOW
:
6908 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6909 _("relocation overflow in %s"),
6910 reloc_property
->name().c_str());
6912 case Reloc::STATUS_BAD_RELOC
:
6913 gold_error_at_location(
6916 rela
.get_r_offset(),
6917 _("unexpected opcode while processing relocation %s"),
6918 reloc_property
->name().c_str());
6928 template<int size
, bool big_endian
>
6930 typename AArch64_relocate_functions
<size
, big_endian
>::Status
6931 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
6932 const Relocate_info
<size
, big_endian
>* relinfo
,
6933 Target_aarch64
<size
, big_endian
>* target
,
6935 const elfcpp::Rela
<size
, big_endian
>& rela
,
6936 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
6937 const Symbol_value
<size
>* psymval
,
6938 unsigned char* view
,
6939 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
6941 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
6942 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
6944 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
6945 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6946 const AArch64_reloc_property
* reloc_property
=
6947 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6948 gold_assert(reloc_property
!= NULL
);
6950 const bool is_final
= (gsym
== NULL
6951 ? !parameters
->options().shared()
6952 : gsym
->final_value_is_known());
6953 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6954 optimize_tls_reloc(is_final
, r_type
);
6956 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6957 int tls_got_offset_type
;
6960 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6961 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
6963 if (tlsopt
== tls::TLSOPT_TO_LE
)
6965 if (tls_segment
== NULL
)
6967 gold_assert(parameters
->errors()->error_count() > 0
6968 || issue_undefined_symbol_error(gsym
));
6969 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
6971 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
6974 else if (tlsopt
== tls::TLSOPT_NONE
)
6976 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
6977 // Firstly get the address for the got entry.
6978 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
6981 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
6982 got_entry_address
= target
->got_
->address() +
6983 gsym
->got_offset(tls_got_offset_type
);
6987 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6989 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
6990 got_entry_address
= target
->got_
->address() +
6991 object
->local_got_offset(r_sym
, tls_got_offset_type
);
6994 // Relocate the address into adrp/ld, adrp/add pair.
6997 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6998 return aarch64_reloc_funcs::adrp(
6999 view
, got_entry_address
+ addend
, address
);
7003 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
7004 return aarch64_reloc_funcs::template rela_general
<32>(
7005 view
, got_entry_address
, addend
, reloc_property
);
7012 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7013 _("unsupported gd_to_ie relaxation on %u"),
7018 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7019 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7021 if (tlsopt
== tls::TLSOPT_TO_LE
)
7023 if (tls_segment
== NULL
)
7025 gold_assert(parameters
->errors()->error_count() > 0
7026 || issue_undefined_symbol_error(gsym
));
7027 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7029 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7033 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7034 // Relocate the field with the offset of the GOT entry for
7035 // the module index.
7036 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7037 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7038 target
->got_
->address());
7042 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7043 return aarch64_reloc_funcs::adrp(
7044 view
, got_entry_address
+ addend
, address
);
7047 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7048 return aarch64_reloc_funcs::template rela_general
<32>(
7049 view
, got_entry_address
, addend
, reloc_property
);
7058 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7059 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7060 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7061 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7063 AArch64_address value
= psymval
->value(object
, 0);
7064 if (tlsopt
== tls::TLSOPT_TO_LE
)
7066 if (tls_segment
== NULL
)
7068 gold_assert(parameters
->errors()->error_count() > 0
7069 || issue_undefined_symbol_error(gsym
));
7070 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7075 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7076 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7080 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7081 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7082 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7083 return aarch64_reloc_funcs::template rela_general
<32>(
7084 view
, value
, addend
, reloc_property
);
7090 // We should never reach here.
7094 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7095 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7097 if (tlsopt
== tls::TLSOPT_TO_LE
)
7099 if (tls_segment
== NULL
)
7101 gold_assert(parameters
->errors()->error_count() > 0
7102 || issue_undefined_symbol_error(gsym
));
7103 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7105 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7108 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7110 // Firstly get the address for the got entry.
7111 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7114 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7115 got_entry_address
= target
->got_
->address() +
7116 gsym
->got_offset(tls_got_offset_type
);
7120 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7122 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7123 got_entry_address
= target
->got_
->address() +
7124 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7126 // Relocate the address into adrp/ld, adrp/add pair.
7129 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7130 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7133 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7134 return aarch64_reloc_funcs::template rela_general
<32>(
7135 view
, got_entry_address
, addend
, reloc_property
);
7140 // We shall never reach here.
7143 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7144 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7145 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7146 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7147 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7148 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7149 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7150 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7152 gold_assert(tls_segment
!= NULL
);
7153 AArch64_address value
= psymval
->value(object
, 0);
7155 if (!parameters
->options().shared())
7157 AArch64_address aligned_tcb_size
=
7158 align_address(target
->tcb_size(),
7159 tls_segment
->maximum_alignment());
7160 value
+= aligned_tcb_size
;
7163 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7164 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7165 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7166 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7169 return aarch64_reloc_funcs::template
7170 rela_general
<32>(view
,
7177 gold_error(_("%s: unsupported reloc %u "
7178 "in non-static TLSLE mode."),
7179 object
->name().c_str(), r_type
);
7183 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7184 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7185 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7186 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7188 if (tlsopt
== tls::TLSOPT_TO_LE
)
7190 if (tls_segment
== NULL
)
7192 gold_assert(parameters
->errors()->error_count() > 0
7193 || issue_undefined_symbol_error(gsym
));
7194 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7196 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7201 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7202 ? GOT_TYPE_TLS_OFFSET
7203 : GOT_TYPE_TLS_DESC
);
7204 unsigned int got_tlsdesc_offset
= 0;
7205 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7206 && tlsopt
== tls::TLSOPT_NONE
)
7208 // We created GOT entries in the .got.tlsdesc portion of the
7209 // .got.plt section, but the offset stored in the symbol is the
7210 // offset within .got.tlsdesc.
7211 got_tlsdesc_offset
= (target
->got_
->data_size()
7212 + target
->got_plt_section()->data_size());
7214 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7217 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7218 got_entry_address
= target
->got_
->address()
7219 + got_tlsdesc_offset
7220 + gsym
->got_offset(tls_got_offset_type
);
7224 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7226 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7227 got_entry_address
= target
->got_
->address() +
7228 got_tlsdesc_offset
+
7229 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7231 if (tlsopt
== tls::TLSOPT_TO_IE
)
7233 if (tls_segment
== NULL
)
7235 gold_assert(parameters
->errors()->error_count() > 0
7236 || issue_undefined_symbol_error(gsym
));
7237 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7239 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7240 view
, psymval
, got_entry_address
,
7244 // Now do tlsdesc relocation.
7247 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7248 return aarch64_reloc_funcs::adrp(view
,
7249 got_entry_address
+ addend
,
7252 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7253 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7254 return aarch64_reloc_funcs::template rela_general
<32>(
7255 view
, got_entry_address
, addend
, reloc_property
);
7257 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7258 return aarch64_reloc_funcs::STATUS_OKAY
;
7268 gold_error(_("%s: unsupported TLS reloc %u."),
7269 object
->name().c_str(), r_type
);
7271 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7272 } // End of relocate_tls.
7275 template<int size
, bool big_endian
>
7277 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7278 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7279 const Relocate_info
<size
, big_endian
>* relinfo
,
7280 Target_aarch64
<size
, big_endian
>* target
,
7281 const elfcpp::Rela
<size
, big_endian
>& rela
,
7282 unsigned int r_type
,
7283 unsigned char* view
,
7284 const Symbol_value
<size
>* psymval
)
7286 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7287 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7288 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7290 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7291 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7292 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7293 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7295 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7297 // This is the 2nd relocs, optimization should already have been
7299 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7300 return aarch64_reloc_funcs::STATUS_OKAY
;
7303 // The original sequence is -
7304 // 90000000 adrp x0, 0 <main>
7305 // 91000000 add x0, x0, #0x0
7306 // 94000000 bl 0 <__tls_get_addr>
7307 // optimized to sequence -
7308 // d53bd040 mrs x0, tpidr_el0
7309 // 91400000 add x0, x0, #0x0, lsl #12
7310 // 91000000 add x0, x0, #0x0
7312 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7313 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7314 // have to change "bl tls_get_addr", which does not have a corresponding tls
7315 // relocation type. So before proceeding, we need to make sure compiler
7316 // does not change the sequence.
7317 if(!(insn1
== 0x90000000 // adrp x0,0
7318 && insn2
== 0x91000000 // add x0, x0, #0x0
7319 && insn3
== 0x94000000)) // bl 0
7321 // Ideally we should give up gd_to_le relaxation and do gd access.
7322 // However the gd_to_le relaxation decision has been made early
7323 // in the scan stage, where we did not allocate any GOT entry for
7324 // this symbol. Therefore we have to exit and report error now.
7325 gold_error(_("unexpected reloc insn sequence while relaxing "
7326 "tls gd to le for reloc %u."), r_type
);
7327 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7331 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7332 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7333 insn3
= 0x91000000; // add x0, x0, #0x0
7334 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7335 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7336 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7338 // Calculate tprel value.
7339 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7340 gold_assert(tls_segment
!= NULL
);
7341 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7342 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7343 AArch64_address aligned_tcb_size
=
7344 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7345 AArch64_address x
= value
+ aligned_tcb_size
;
7347 // After new insns are written, apply TLSLE relocs.
7348 const AArch64_reloc_property
* rp1
=
7349 aarch64_reloc_property_table
->get_reloc_property(
7350 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7351 const AArch64_reloc_property
* rp2
=
7352 aarch64_reloc_property_table
->get_reloc_property(
7353 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7354 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7356 typename
aarch64_reloc_funcs::Status s1
=
7357 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7361 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7364 typename
aarch64_reloc_funcs::Status s2
=
7365 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7370 this->skip_call_tls_get_addr_
= true;
7372 } // End of tls_gd_to_le
7375 template<int size
, bool big_endian
>
7377 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7378 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7379 const Relocate_info
<size
, big_endian
>* relinfo
,
7380 Target_aarch64
<size
, big_endian
>* target
,
7381 const elfcpp::Rela
<size
, big_endian
>& rela
,
7382 unsigned int r_type
,
7383 unsigned char* view
,
7384 const Symbol_value
<size
>* psymval
)
7386 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7387 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7388 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7390 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7391 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7392 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7393 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7395 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7397 // This is the 2nd relocs, optimization should already have been
7399 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7400 return aarch64_reloc_funcs::STATUS_OKAY
;
7403 // The original sequence is -
7404 // 90000000 adrp x0, 0 <main>
7405 // 91000000 add x0, x0, #0x0
7406 // 94000000 bl 0 <__tls_get_addr>
7407 // optimized to sequence -
7408 // d53bd040 mrs x0, tpidr_el0
7409 // 91400000 add x0, x0, #0x0, lsl #12
7410 // 91000000 add x0, x0, #0x0
7412 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7413 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7414 // have to change "bl tls_get_addr", which does not have a corresponding tls
7415 // relocation type. So before proceeding, we need to make sure compiler
7416 // does not change the sequence.
7417 if(!(insn1
== 0x90000000 // adrp x0,0
7418 && insn2
== 0x91000000 // add x0, x0, #0x0
7419 && insn3
== 0x94000000)) // bl 0
7421 // Ideally we should give up gd_to_le relaxation and do gd access.
7422 // However the gd_to_le relaxation decision has been made early
7423 // in the scan stage, where we did not allocate any GOT entry for
7424 // this symbol. Therefore we have to exit and report error now.
7425 gold_error(_("unexpected reloc insn sequence while relaxing "
7426 "tls gd to le for reloc %u."), r_type
);
7427 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7431 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7432 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7433 insn3
= 0x91000000; // add x0, x0, #0x0
7434 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7435 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7436 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7438 // Calculate tprel value.
7439 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7440 gold_assert(tls_segment
!= NULL
);
7441 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7442 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7443 AArch64_address aligned_tcb_size
=
7444 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7445 AArch64_address x
= value
+ aligned_tcb_size
;
7447 // After new insns are written, apply TLSLE relocs.
7448 const AArch64_reloc_property
* rp1
=
7449 aarch64_reloc_property_table
->get_reloc_property(
7450 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7451 const AArch64_reloc_property
* rp2
=
7452 aarch64_reloc_property_table
->get_reloc_property(
7453 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7454 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7456 typename
aarch64_reloc_funcs::Status s1
=
7457 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7461 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7464 typename
aarch64_reloc_funcs::Status s2
=
7465 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7470 this->skip_call_tls_get_addr_
= true;
7473 } // End of tls_ld_to_le
7475 template<int size
, bool big_endian
>
7477 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7478 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7479 const Relocate_info
<size
, big_endian
>* relinfo
,
7480 Target_aarch64
<size
, big_endian
>* target
,
7481 const elfcpp::Rela
<size
, big_endian
>& rela
,
7482 unsigned int r_type
,
7483 unsigned char* view
,
7484 const Symbol_value
<size
>* psymval
)
7486 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7487 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7488 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7490 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7491 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7492 AArch64_address aligned_tcb_address
=
7493 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7494 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7495 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7496 // "x" is the offset to tp, we can only do this if x is within
7497 // range [0, 2^32-1]
7498 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7500 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7502 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7505 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7506 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7509 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7512 regno
= (insn
& 0x1f);
7513 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7515 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7518 regno
= (insn
& 0x1f);
7519 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7520 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7525 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7526 return aarch64_reloc_funcs::STATUS_OKAY
;
7527 } // End of tls_ie_to_le
7530 template<int size
, bool big_endian
>
7532 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7533 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7534 const Relocate_info
<size
, big_endian
>* relinfo
,
7535 Target_aarch64
<size
, big_endian
>* target
,
7536 const elfcpp::Rela
<size
, big_endian
>& rela
,
7537 unsigned int r_type
,
7538 unsigned char* view
,
7539 const Symbol_value
<size
>* psymval
)
7541 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7542 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7543 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7545 // TLSDESC-GD sequence is like:
7546 // adrp x0, :tlsdesc:v1
7547 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7548 // add x0, x0, :tlsdesc_lo12:v1
7551 // After desc_gd_to_le optimization, the sequence will be like:
7552 // movz x0, #0x0, lsl #16
7557 // Calculate tprel value.
7558 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7559 gold_assert(tls_segment
!= NULL
);
7560 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7561 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7562 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7563 AArch64_address aligned_tcb_size
=
7564 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7565 AArch64_address x
= value
+ aligned_tcb_size
;
7566 // x is the offset to tp, we can only do this if x is within range
7567 // [0, 2^32-1]. If x is out of range, fail and exit.
7568 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7570 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7571 "We Can't do gd_to_le relaxation.\n"), r_type
);
7572 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7577 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7578 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7580 newinsn
= 0xd503201f;
7583 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7585 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7588 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7590 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7594 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7598 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7599 return aarch64_reloc_funcs::STATUS_OKAY
;
7600 } // End of tls_desc_gd_to_le
7603 template<int size
, bool big_endian
>
7605 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7606 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
7607 const Relocate_info
<size
, big_endian
>* /* relinfo */,
7608 Target_aarch64
<size
, big_endian
>* /* target */,
7609 const elfcpp::Rela
<size
, big_endian
>& rela
,
7610 unsigned int r_type
,
7611 unsigned char* view
,
7612 const Symbol_value
<size
>* /* psymval */,
7613 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
7614 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7616 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7617 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7619 // TLSDESC-GD sequence is like:
7620 // adrp x0, :tlsdesc:v1
7621 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7622 // add x0, x0, :tlsdesc_lo12:v1
7625 // After desc_gd_to_ie optimization, the sequence will be like:
7626 // adrp x0, :tlsie:v1
7627 // ldr x0, [x0, :tlsie_lo12:v1]
7631 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7632 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7636 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7637 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7639 newinsn
= 0xd503201f;
7640 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7643 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7645 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7650 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7652 // Set ldr target register to be x0.
7653 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7655 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
7657 const AArch64_reloc_property
* reloc_property
=
7658 aarch64_reloc_property_table
->get_reloc_property(
7659 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
7660 return aarch64_reloc_funcs::template rela_general
<32>(
7661 view
, got_entry_address
, addend
, reloc_property
);
7666 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7670 return aarch64_reloc_funcs::STATUS_OKAY
;
7671 } // End of tls_desc_gd_to_ie
7673 // Relocate section data.
7675 template<int size
, bool big_endian
>
7677 Target_aarch64
<size
, big_endian
>::relocate_section(
7678 const Relocate_info
<size
, big_endian
>* relinfo
,
7679 unsigned int sh_type
,
7680 const unsigned char* prelocs
,
7682 Output_section
* output_section
,
7683 bool needs_special_offset_handling
,
7684 unsigned char* view
,
7685 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
7686 section_size_type view_size
,
7687 const Reloc_symbol_changes
* reloc_symbol_changes
)
7689 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7690 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
7691 gold::relocate_section
<size
, big_endian
, Target_aarch64
, elfcpp::SHT_RELA
,
7692 AArch64_relocate
, gold::Default_comdat_behavior
>(
7698 needs_special_offset_handling
,
7702 reloc_symbol_changes
);
7705 // Return the size of a relocation while scanning during a relocatable
7708 template<int size
, bool big_endian
>
7710 Target_aarch64
<size
, big_endian
>::Relocatable_size_for_reloc::
7715 // We will never support SHT_REL relocations.
7720 // Scan the relocs during a relocatable link.
7722 template<int size
, bool big_endian
>
7724 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
7725 Symbol_table
* symtab
,
7727 Sized_relobj_file
<size
, big_endian
>* object
,
7728 unsigned int data_shndx
,
7729 unsigned int sh_type
,
7730 const unsigned char* prelocs
,
7732 Output_section
* output_section
,
7733 bool needs_special_offset_handling
,
7734 size_t local_symbol_count
,
7735 const unsigned char* plocal_symbols
,
7736 Relocatable_relocs
* rr
)
7738 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7740 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
7741 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
7743 gold::scan_relocatable_relocs
<size
, big_endian
, elfcpp::SHT_RELA
,
7744 Scan_relocatable_relocs
>(
7752 needs_special_offset_handling
,
7758 // Relocate a section during a relocatable link.
7760 template<int size
, bool big_endian
>
7762 Target_aarch64
<size
, big_endian
>::relocate_relocs(
7763 const Relocate_info
<size
, big_endian
>* relinfo
,
7764 unsigned int sh_type
,
7765 const unsigned char* prelocs
,
7767 Output_section
* output_section
,
7768 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
7769 const Relocatable_relocs
* rr
,
7770 unsigned char* view
,
7771 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
7772 section_size_type view_size
,
7773 unsigned char* reloc_view
,
7774 section_size_type reloc_view_size
)
7776 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7778 gold::relocate_relocs
<size
, big_endian
, elfcpp::SHT_RELA
>(
7783 offset_in_output_section
,
7793 // Return whether this is a 3-insn erratum sequence.
7795 template<int size
, bool big_endian
>
7797 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
7798 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
7799 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
7800 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
7805 // The 2nd insn is a single register load or store; or register pair
7807 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
7808 && (!pair
|| (pair
&& !load
)))
7810 // The 3rd insn is a load or store instruction from the "Load/store
7811 // register (unsigned immediate)" encoding class, using Rn as the
7812 // base address register.
7813 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
7814 && (Insn_utilities::aarch64_rn(insn3
)
7815 == Insn_utilities::aarch64_rd(insn1
)))
7822 // Return whether this is a 835769 sequence.
7823 // (Similarly implemented as in elfnn-aarch64.c.)
7825 template<int size
, bool big_endian
>
7827 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
7828 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
7829 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
7839 if (Insn_utilities::aarch64_mlxl(insn2
)
7840 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
7842 /* Any SIMD memory op is independent of the subsequent MLA
7843 by definition of the erratum. */
7844 if (Insn_utilities::aarch64_bit(insn1
, 26))
7847 /* If not SIMD, check for integer memory ops and MLA relationship. */
7848 rn
= Insn_utilities::aarch64_rn(insn2
);
7849 ra
= Insn_utilities::aarch64_ra(insn2
);
7850 rm
= Insn_utilities::aarch64_rm(insn2
);
7852 /* If this is a load and there's a true(RAW) dependency, we are safe
7853 and this is not an erratum sequence. */
7855 (rt
== rn
|| rt
== rm
|| rt
== ra
7856 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
7859 /* We conservatively put out stubs for all other cases (including
7868 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
7870 template<int size
, bool big_endian
>
7872 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
7873 AArch64_relobj
<size
, big_endian
>* relobj
,
7875 section_size_type erratum_insn_offset
,
7876 Address erratum_address
,
7877 typename
Insn_utilities::Insntype erratum_insn
,
7880 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
7881 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
7882 gold_assert(stub_table
!= NULL
);
7883 if (stub_table
->find_erratum_stub(relobj
,
7885 erratum_insn_offset
) == NULL
)
7887 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
7888 The_erratum_stub
* stub
= new The_erratum_stub(
7889 relobj
, erratum_type
, shndx
, erratum_insn_offset
);
7890 stub
->set_erratum_insn(erratum_insn
);
7891 stub
->set_erratum_address(erratum_address
);
7892 // For erratum ST_E_843419 and ST_E_835769, the destination address is
7893 // always the next insn after erratum insn.
7894 stub
->set_destination_address(erratum_address
+ BPI
);
7895 stub_table
->add_erratum_stub(stub
);
7900 // Scan erratum for section SHNDX range [output_address + span_start,
7901 // output_address + span_end). Note here we do not share the code with
7902 // scan_erratum_843419_span function, because for 843419 we optimize by only
7903 // scanning the last few insns of a page, whereas for 835769, we need to scan
7906 template<int size
, bool big_endian
>
7908 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
7909 AArch64_relobj
<size
, big_endian
>* relobj
,
7911 const section_size_type span_start
,
7912 const section_size_type span_end
,
7913 unsigned char* input_view
,
7914 Address output_address
)
7916 typedef typename
Insn_utilities::Insntype Insntype
;
7918 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
7920 // Adjust output_address and view to the start of span.
7921 output_address
+= span_start
;
7922 input_view
+= span_start
;
7924 section_size_type span_length
= span_end
- span_start
;
7925 section_size_type offset
= 0;
7926 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
7928 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
7929 Insntype insn1
= ip
[0];
7930 Insntype insn2
= ip
[1];
7931 if (is_erratum_835769_sequence(insn1
, insn2
))
7933 Insntype erratum_insn
= insn2
;
7934 // "span_start + offset" is the offset for insn1. So for insn2, it is
7935 // "span_start + offset + BPI".
7936 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
7937 Address erratum_address
= output_address
+ offset
+ BPI
;
7938 gold_warning(_("Erratum 835769 found and fixed at \"%s\", "
7939 "section %d, offset 0x%08x."),
7940 relobj
->name().c_str(), shndx
,
7941 (unsigned int)(span_start
+ offset
));
7943 this->create_erratum_stub(relobj
, shndx
,
7944 erratum_insn_offset
, erratum_address
,
7945 erratum_insn
, ST_E_835769
);
7946 offset
+= BPI
; // Skip mac insn.
7949 } // End of "Target_aarch64::scan_erratum_835769_span".
7952 // Scan erratum for section SHNDX range
7953 // [output_address + span_start, output_address + span_end).
7955 template<int size
, bool big_endian
>
7957 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
7958 AArch64_relobj
<size
, big_endian
>* relobj
,
7960 const section_size_type span_start
,
7961 const section_size_type span_end
,
7962 unsigned char* input_view
,
7963 Address output_address
)
7965 typedef typename
Insn_utilities::Insntype Insntype
;
7967 // Adjust output_address and view to the start of span.
7968 output_address
+= span_start
;
7969 input_view
+= span_start
;
7971 if ((output_address
& 0x03) != 0)
7974 section_size_type offset
= 0;
7975 section_size_type span_length
= span_end
- span_start
;
7976 // The first instruction must be ending at 0xFF8 or 0xFFC.
7977 unsigned int page_offset
= output_address
& 0xFFF;
7978 // Make sure starting position, that is "output_address+offset",
7979 // starts at page position 0xff8 or 0xffc.
7980 if (page_offset
< 0xff8)
7981 offset
= 0xff8 - page_offset
;
7982 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
7984 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
7985 Insntype insn1
= ip
[0];
7986 if (Insn_utilities::is_adrp(insn1
))
7988 Insntype insn2
= ip
[1];
7989 Insntype insn3
= ip
[2];
7990 Insntype erratum_insn
;
7991 unsigned insn_offset
;
7992 bool do_report
= false;
7993 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
7996 erratum_insn
= insn3
;
7997 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
7999 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
8001 // Optionally we can have an insn between ins2 and ins3
8002 Insntype insn_opt
= ip
[2];
8003 // And insn_opt must not be a branch.
8004 if (!Insn_utilities::aarch64_b(insn_opt
)
8005 && !Insn_utilities::aarch64_bl(insn_opt
)
8006 && !Insn_utilities::aarch64_blr(insn_opt
)
8007 && !Insn_utilities::aarch64_br(insn_opt
))
8009 // And insn_opt must not write to dest reg in insn1. However
8010 // we do a conservative scan, which means we may fix/report
8011 // more than necessary, but it doesn't hurt.
8013 Insntype insn4
= ip
[3];
8014 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8017 erratum_insn
= insn4
;
8018 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8024 gold_warning(_("Erratum 843419 found and fixed at \"%s\", "
8025 "section %d, offset 0x%08x."),
8026 relobj
->name().c_str(), shndx
,
8027 (unsigned int)(span_start
+ offset
));
8028 unsigned int erratum_insn_offset
=
8029 span_start
+ offset
+ insn_offset
;
8030 Address erratum_address
=
8031 output_address
+ offset
+ insn_offset
;
8032 create_erratum_stub(relobj
, shndx
,
8033 erratum_insn_offset
, erratum_address
,
8034 erratum_insn
, ST_E_843419
);
8038 // Advance to next candidate instruction. We only consider instruction
8039 // sequences starting at a page offset of 0xff8 or 0xffc.
8040 page_offset
= (output_address
+ offset
) & 0xfff;
8041 if (page_offset
== 0xff8)
8043 else // (page_offset == 0xffc), we move to next page's 0xff8.
8046 } // End of "Target_aarch64::scan_erratum_843419_span".
8049 // The selector for aarch64 object files.
8051 template<int size
, bool big_endian
>
8052 class Target_selector_aarch64
: public Target_selector
8055 Target_selector_aarch64();
8058 do_instantiate_target()
8059 { return new Target_aarch64
<size
, big_endian
>(); }
8063 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8064 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8065 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8069 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8070 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8071 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8075 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8076 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8077 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8081 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8082 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8083 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8086 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8087 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8088 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8089 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8091 } // End anonymous namespace.