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.
1835 const char* sym_name
= pnames
+ sym
.get_st_name();
1836 if (sym_name
[0] == '$' && (sym_name
[1] == 'x' || sym_name
[1] == 'd')
1837 && sym_name
[2] == '\0')
1840 unsigned int input_shndx
=
1841 this->adjust_sym_shndx(i
, sym
.get_st_shndx(), &is_ordinary
);
1842 gold_assert(is_ordinary
);
1844 Mapping_symbol_position
msp(input_shndx
, input_value
);
1845 // Insert mapping_symbol_info into map whose ordering is defined by
1846 // (shndx, offset_within_section).
1847 this->mapping_symbol_info_
[msp
] = sym_name
[1];
1853 // Fix all errata in the object.
1855 template<int size
, bool big_endian
>
1857 AArch64_relobj
<size
, big_endian
>::fix_errata(
1858 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1860 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
1861 unsigned int shnum
= this->shnum();
1862 for (unsigned int i
= 1; i
< shnum
; ++i
)
1864 The_stub_table
* stub_table
= this->stub_table(i
);
1867 std::pair
<Erratum_stub_set_iter
, Erratum_stub_set_iter
>
1868 ipair(stub_table
->find_erratum_stubs_for_input_section(this, i
));
1869 Erratum_stub_set_iter p
= ipair
.first
, end
= ipair
.second
;
1872 The_erratum_stub
* stub
= *p
;
1873 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1874 pview((*pviews
)[i
]);
1876 // Double check data before fix.
1877 gold_assert(pview
.address
+ stub
->sh_offset()
1878 == stub
->erratum_address());
1880 // Update previously recorded erratum insn with relocated
1883 reinterpret_cast<Insntype
*>(pview
.view
+ stub
->sh_offset());
1884 Insntype insn_to_fix
= ip
[0];
1885 stub
->update_erratum_insn(insn_to_fix
);
1887 // Replace the erratum insn with a branch-to-stub.
1888 AArch64_address stub_address
=
1889 stub_table
->erratum_stub_address(stub
);
1890 unsigned int b_offset
= stub_address
- stub
->erratum_address();
1891 AArch64_relocate_functions
<size
, big_endian
>::construct_b(
1892 pview
.view
+ stub
->sh_offset(), b_offset
& 0xfffffff);
1899 // Relocate sections.
1901 template<int size
, bool big_endian
>
1903 AArch64_relobj
<size
, big_endian
>::do_relocate_sections(
1904 const Symbol_table
* symtab
, const Layout
* layout
,
1905 const unsigned char* pshdrs
, Output_file
* of
,
1906 typename Sized_relobj_file
<size
, big_endian
>::Views
* pviews
)
1908 // Call parent to relocate sections.
1909 Sized_relobj_file
<size
, big_endian
>::do_relocate_sections(symtab
, layout
,
1910 pshdrs
, of
, pviews
);
1912 // We do not generate stubs if doing a relocatable link.
1913 if (parameters
->options().relocatable())
1916 if (parameters
->options().fix_cortex_a53_843419()
1917 || parameters
->options().fix_cortex_a53_835769())
1918 this->fix_errata(pviews
);
1920 Relocate_info
<size
, big_endian
> relinfo
;
1921 relinfo
.symtab
= symtab
;
1922 relinfo
.layout
= layout
;
1923 relinfo
.object
= this;
1925 // Relocate stub tables.
1926 unsigned int shnum
= this->shnum();
1927 The_target_aarch64
* target
= The_target_aarch64::current_target();
1929 for (unsigned int i
= 1; i
< shnum
; ++i
)
1931 The_aarch64_input_section
* aarch64_input_section
=
1932 target
->find_aarch64_input_section(this, i
);
1933 if (aarch64_input_section
!= NULL
1934 && aarch64_input_section
->is_stub_table_owner()
1935 && !aarch64_input_section
->stub_table()->empty())
1937 Output_section
* os
= this->output_section(i
);
1938 gold_assert(os
!= NULL
);
1940 relinfo
.reloc_shndx
= elfcpp::SHN_UNDEF
;
1941 relinfo
.reloc_shdr
= NULL
;
1942 relinfo
.data_shndx
= i
;
1943 relinfo
.data_shdr
= pshdrs
+ i
* elfcpp::Elf_sizes
<size
>::shdr_size
;
1945 typename Sized_relobj_file
<size
, big_endian
>::View_size
&
1946 view_struct
= (*pviews
)[i
];
1947 gold_assert(view_struct
.view
!= NULL
);
1949 The_stub_table
* stub_table
= aarch64_input_section
->stub_table();
1950 off_t offset
= stub_table
->address() - view_struct
.address
;
1951 unsigned char* view
= view_struct
.view
+ offset
;
1952 AArch64_address address
= stub_table
->address();
1953 section_size_type view_size
= stub_table
->data_size();
1954 stub_table
->relocate_stubs(&relinfo
, target
, os
, view
, address
,
1961 // Determine if an input section is scannable for stub processing. SHDR is
1962 // the header of the section and SHNDX is the section index. OS is the output
1963 // section for the input section and SYMTAB is the global symbol table used to
1964 // look up ICF information.
1966 template<int size
, bool big_endian
>
1968 AArch64_relobj
<size
, big_endian
>::text_section_is_scannable(
1969 const elfcpp::Shdr
<size
, big_endian
>& text_shdr
,
1970 unsigned int text_shndx
,
1971 const Output_section
* os
,
1972 const Symbol_table
* symtab
)
1974 // Skip any empty sections, unallocated sections or sections whose
1975 // type are not SHT_PROGBITS.
1976 if (text_shdr
.get_sh_size() == 0
1977 || (text_shdr
.get_sh_flags() & elfcpp::SHF_ALLOC
) == 0
1978 || text_shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
1981 // Skip any discarded or ICF'ed sections.
1982 if (os
== NULL
|| symtab
->is_section_folded(this, text_shndx
))
1985 // Skip exception frame.
1986 if (strcmp(os
->name(), ".eh_frame") == 0)
1989 gold_assert(!this->is_output_section_offset_invalid(text_shndx
) ||
1990 os
->find_relaxed_input_section(this, text_shndx
) != NULL
);
1996 // Determine if we want to scan the SHNDX-th section for relocation stubs.
1997 // This is a helper for AArch64_relobj::scan_sections_for_stubs().
1999 template<int size
, bool big_endian
>
2001 AArch64_relobj
<size
, big_endian
>::section_needs_reloc_stub_scanning(
2002 const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2003 const Relobj::Output_sections
& out_sections
,
2004 const Symbol_table
* symtab
,
2005 const unsigned char* pshdrs
)
2007 unsigned int sh_type
= shdr
.get_sh_type();
2008 if (sh_type
!= elfcpp::SHT_RELA
)
2011 // Ignore empty section.
2012 off_t sh_size
= shdr
.get_sh_size();
2016 // Ignore reloc section with unexpected symbol table. The
2017 // error will be reported in the final link.
2018 if (this->adjust_shndx(shdr
.get_sh_link()) != this->symtab_shndx())
2021 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2022 unsigned int reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2024 // Ignore reloc section with unexpected entsize or uneven size.
2025 // The error will be reported in the final link.
2026 if (reloc_size
!= shdr
.get_sh_entsize() || sh_size
% reloc_size
!= 0)
2029 // Ignore reloc section with bad info. This error will be
2030 // reported in the final link.
2031 unsigned int text_shndx
= this->adjust_shndx(shdr
.get_sh_info());
2032 if (text_shndx
>= this->shnum())
2035 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2036 const elfcpp::Shdr
<size
, big_endian
> text_shdr(pshdrs
+
2037 text_shndx
* shdr_size
);
2038 return this->text_section_is_scannable(text_shdr
, text_shndx
,
2039 out_sections
[text_shndx
], symtab
);
2043 // Scan section SHNDX for erratum 843419 and 835769.
2045 template<int size
, bool big_endian
>
2047 AArch64_relobj
<size
, big_endian
>::scan_errata(
2048 unsigned int shndx
, const elfcpp::Shdr
<size
, big_endian
>& shdr
,
2049 Output_section
* os
, const Symbol_table
* symtab
,
2050 The_target_aarch64
* target
)
2052 if (shdr
.get_sh_size() == 0
2053 || (shdr
.get_sh_flags() &
2054 (elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
)) == 0
2055 || shdr
.get_sh_type() != elfcpp::SHT_PROGBITS
)
2058 if (!os
|| symtab
->is_section_folded(this, shndx
)) return;
2060 AArch64_address output_offset
= this->get_output_section_offset(shndx
);
2061 AArch64_address output_address
;
2062 if (output_offset
!= invalid_address
)
2063 output_address
= os
->address() + output_offset
;
2066 const Output_relaxed_input_section
* poris
=
2067 os
->find_relaxed_input_section(this, shndx
);
2069 output_address
= poris
->address();
2072 section_size_type input_view_size
= 0;
2073 const unsigned char* input_view
=
2074 this->section_contents(shndx
, &input_view_size
, false);
2076 Mapping_symbol_position
section_start(shndx
, 0);
2077 // Find the first mapping symbol record within section shndx.
2078 typename
Mapping_symbol_info::const_iterator p
=
2079 this->mapping_symbol_info_
.lower_bound(section_start
);
2080 if (p
== this->mapping_symbol_info_
.end() || p
->first
.shndx_
!= shndx
)
2081 gold_warning(_("cannot scan executable section %u of %s for Cortex-A53 "
2082 "erratum because it has no mapping symbols."),
2083 shndx
, this->name().c_str());
2084 while (p
!= this->mapping_symbol_info_
.end() &&
2085 p
->first
.shndx_
== shndx
)
2087 typename
Mapping_symbol_info::const_iterator prev
= p
;
2089 if (prev
->second
== 'x')
2091 section_size_type span_start
=
2092 convert_to_section_size_type(prev
->first
.offset_
);
2093 section_size_type span_end
;
2094 if (p
!= this->mapping_symbol_info_
.end()
2095 && p
->first
.shndx_
== shndx
)
2096 span_end
= convert_to_section_size_type(p
->first
.offset_
);
2098 span_end
= convert_to_section_size_type(shdr
.get_sh_size());
2100 // Here we do not share the scanning code of both errata. For 843419,
2101 // only the last few insns of each page are examined, which is fast,
2102 // whereas, for 835769, every insn pair needs to be checked.
2104 if (parameters
->options().fix_cortex_a53_843419())
2105 target
->scan_erratum_843419_span(
2106 this, shndx
, span_start
, span_end
,
2107 const_cast<unsigned char*>(input_view
), output_address
);
2109 if (parameters
->options().fix_cortex_a53_835769())
2110 target
->scan_erratum_835769_span(
2111 this, shndx
, span_start
, span_end
,
2112 const_cast<unsigned char*>(input_view
), output_address
);
2118 // Scan relocations for stub generation.
2120 template<int size
, bool big_endian
>
2122 AArch64_relobj
<size
, big_endian
>::scan_sections_for_stubs(
2123 The_target_aarch64
* target
,
2124 const Symbol_table
* symtab
,
2125 const Layout
* layout
)
2127 unsigned int shnum
= this->shnum();
2128 const unsigned int shdr_size
= elfcpp::Elf_sizes
<size
>::shdr_size
;
2130 // Read the section headers.
2131 const unsigned char* pshdrs
= this->get_view(this->elf_file()->shoff(),
2135 // To speed up processing, we set up hash tables for fast lookup of
2136 // input offsets to output addresses.
2137 this->initialize_input_to_output_maps();
2139 const Relobj::Output_sections
& out_sections(this->output_sections());
2141 Relocate_info
<size
, big_endian
> relinfo
;
2142 relinfo
.symtab
= symtab
;
2143 relinfo
.layout
= layout
;
2144 relinfo
.object
= this;
2146 // Do relocation stubs scanning.
2147 const unsigned char* p
= pshdrs
+ shdr_size
;
2148 for (unsigned int i
= 1; i
< shnum
; ++i
, p
+= shdr_size
)
2150 const elfcpp::Shdr
<size
, big_endian
> shdr(p
);
2151 if (parameters
->options().fix_cortex_a53_843419()
2152 || parameters
->options().fix_cortex_a53_835769())
2153 scan_errata(i
, shdr
, out_sections
[i
], symtab
, target
);
2154 if (this->section_needs_reloc_stub_scanning(shdr
, out_sections
, symtab
,
2157 unsigned int index
= this->adjust_shndx(shdr
.get_sh_info());
2158 AArch64_address output_offset
=
2159 this->get_output_section_offset(index
);
2160 AArch64_address output_address
;
2161 if (output_offset
!= invalid_address
)
2163 output_address
= out_sections
[index
]->address() + output_offset
;
2167 // Currently this only happens for a relaxed section.
2168 const Output_relaxed_input_section
* poris
=
2169 out_sections
[index
]->find_relaxed_input_section(this, index
);
2170 gold_assert(poris
!= NULL
);
2171 output_address
= poris
->address();
2174 // Get the relocations.
2175 const unsigned char* prelocs
= this->get_view(shdr
.get_sh_offset(),
2179 // Get the section contents.
2180 section_size_type input_view_size
= 0;
2181 const unsigned char* input_view
=
2182 this->section_contents(index
, &input_view_size
, false);
2184 relinfo
.reloc_shndx
= i
;
2185 relinfo
.data_shndx
= index
;
2186 unsigned int sh_type
= shdr
.get_sh_type();
2187 unsigned int reloc_size
;
2188 gold_assert (sh_type
== elfcpp::SHT_RELA
);
2189 reloc_size
= elfcpp::Elf_sizes
<size
>::rela_size
;
2191 Output_section
* os
= out_sections
[index
];
2192 target
->scan_section_for_stubs(&relinfo
, sh_type
, prelocs
,
2193 shdr
.get_sh_size() / reloc_size
,
2195 output_offset
== invalid_address
,
2196 input_view
, output_address
,
2203 // A class to wrap an ordinary input section containing executable code.
2205 template<int size
, bool big_endian
>
2206 class AArch64_input_section
: public Output_relaxed_input_section
2209 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2211 AArch64_input_section(Relobj
* relobj
, unsigned int shndx
)
2212 : Output_relaxed_input_section(relobj
, shndx
, 1),
2214 original_contents_(NULL
), original_size_(0),
2215 original_addralign_(1)
2218 ~AArch64_input_section()
2219 { delete[] this->original_contents_
; }
2225 // Set the stub_table.
2227 set_stub_table(The_stub_table
* st
)
2228 { this->stub_table_
= st
; }
2230 // Whether this is a stub table owner.
2232 is_stub_table_owner() const
2233 { return this->stub_table_
!= NULL
&& this->stub_table_
->owner() == this; }
2235 // Return the original size of the section.
2237 original_size() const
2238 { return this->original_size_
; }
2240 // Return the stub table.
2243 { return stub_table_
; }
2246 // Write out this input section.
2248 do_write(Output_file
*);
2250 // Return required alignment of this.
2252 do_addralign() const
2254 if (this->is_stub_table_owner())
2255 return std::max(this->stub_table_
->addralign(),
2256 static_cast<uint64_t>(this->original_addralign_
));
2258 return this->original_addralign_
;
2261 // Finalize data size.
2263 set_final_data_size();
2265 // Reset address and file offset.
2267 do_reset_address_and_file_offset();
2271 do_output_offset(const Relobj
* object
, unsigned int shndx
,
2272 section_offset_type offset
,
2273 section_offset_type
* poutput
) const
2275 if ((object
== this->relobj())
2276 && (shndx
== this->shndx())
2279 convert_types
<section_offset_type
, uint32_t>(this->original_size_
)))
2289 // Copying is not allowed.
2290 AArch64_input_section(const AArch64_input_section
&);
2291 AArch64_input_section
& operator=(const AArch64_input_section
&);
2293 // The relocation stubs.
2294 The_stub_table
* stub_table_
;
2295 // Original section contents. We have to make a copy here since the file
2296 // containing the original section may not be locked when we need to access
2298 unsigned char* original_contents_
;
2299 // Section size of the original input section.
2300 uint32_t original_size_
;
2301 // Address alignment of the original input section.
2302 uint32_t original_addralign_
;
2303 }; // End of AArch64_input_section
2306 // Finalize data size.
2308 template<int size
, bool big_endian
>
2310 AArch64_input_section
<size
, big_endian
>::set_final_data_size()
2312 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2314 if (this->is_stub_table_owner())
2316 this->stub_table_
->finalize_data_size();
2317 off
= align_address(off
, this->stub_table_
->addralign());
2318 off
+= this->stub_table_
->data_size();
2320 this->set_data_size(off
);
2324 // Reset address and file offset.
2326 template<int size
, bool big_endian
>
2328 AArch64_input_section
<size
, big_endian
>::do_reset_address_and_file_offset()
2330 // Size of the original input section contents.
2331 off_t off
= convert_types
<off_t
, uint64_t>(this->original_size_
);
2333 // If this is a stub table owner, account for the stub table size.
2334 if (this->is_stub_table_owner())
2336 The_stub_table
* stub_table
= this->stub_table_
;
2338 // Reset the stub table's address and file offset. The
2339 // current data size for child will be updated after that.
2340 stub_table_
->reset_address_and_file_offset();
2341 off
= align_address(off
, stub_table_
->addralign());
2342 off
+= stub_table
->current_data_size();
2345 this->set_current_data_size(off
);
2349 // Initialize an Arm_input_section.
2351 template<int size
, bool big_endian
>
2353 AArch64_input_section
<size
, big_endian
>::init()
2355 Relobj
* relobj
= this->relobj();
2356 unsigned int shndx
= this->shndx();
2358 // We have to cache original size, alignment and contents to avoid locking
2359 // the original file.
2360 this->original_addralign_
=
2361 convert_types
<uint32_t, uint64_t>(relobj
->section_addralign(shndx
));
2363 // This is not efficient but we expect only a small number of relaxed
2364 // input sections for stubs.
2365 section_size_type section_size
;
2366 const unsigned char* section_contents
=
2367 relobj
->section_contents(shndx
, §ion_size
, false);
2368 this->original_size_
=
2369 convert_types
<uint32_t, uint64_t>(relobj
->section_size(shndx
));
2371 gold_assert(this->original_contents_
== NULL
);
2372 this->original_contents_
= new unsigned char[section_size
];
2373 memcpy(this->original_contents_
, section_contents
, section_size
);
2375 // We want to make this look like the original input section after
2376 // output sections are finalized.
2377 Output_section
* os
= relobj
->output_section(shndx
);
2378 off_t offset
= relobj
->output_section_offset(shndx
);
2379 gold_assert(os
!= NULL
&& !relobj
->is_output_section_offset_invalid(shndx
));
2380 this->set_address(os
->address() + offset
);
2381 this->set_file_offset(os
->offset() + offset
);
2382 this->set_current_data_size(this->original_size_
);
2383 this->finalize_data_size();
2387 // Write data to output file.
2389 template<int size
, bool big_endian
>
2391 AArch64_input_section
<size
, big_endian
>::do_write(Output_file
* of
)
2393 // We have to write out the original section content.
2394 gold_assert(this->original_contents_
!= NULL
);
2395 of
->write(this->offset(), this->original_contents_
,
2396 this->original_size_
);
2398 // If this owns a stub table and it is not empty, write it.
2399 if (this->is_stub_table_owner() && !this->stub_table_
->empty())
2400 this->stub_table_
->write(of
);
2404 // Arm output section class. This is defined mainly to add a number of stub
2405 // generation methods.
2407 template<int size
, bool big_endian
>
2408 class AArch64_output_section
: public Output_section
2411 typedef Target_aarch64
<size
, big_endian
> The_target_aarch64
;
2412 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2413 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2414 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2417 AArch64_output_section(const char* name
, elfcpp::Elf_Word type
,
2418 elfcpp::Elf_Xword flags
)
2419 : Output_section(name
, type
, flags
)
2422 ~AArch64_output_section() {}
2424 // Group input sections for stub generation.
2426 group_sections(section_size_type
, bool, Target_aarch64
<size
, big_endian
>*,
2430 typedef Output_section::Input_section Input_section
;
2431 typedef Output_section::Input_section_list Input_section_list
;
2433 // Create a stub group.
2435 create_stub_group(Input_section_list::const_iterator
,
2436 Input_section_list::const_iterator
,
2437 Input_section_list::const_iterator
,
2438 The_target_aarch64
*,
2439 std::vector
<Output_relaxed_input_section
*>&,
2441 }; // End of AArch64_output_section
2444 // Create a stub group for input sections from FIRST to LAST. OWNER points to
2445 // the input section that will be the owner of the stub table.
2447 template<int size
, bool big_endian
> void
2448 AArch64_output_section
<size
, big_endian
>::create_stub_group(
2449 Input_section_list::const_iterator first
,
2450 Input_section_list::const_iterator last
,
2451 Input_section_list::const_iterator owner
,
2452 The_target_aarch64
* target
,
2453 std::vector
<Output_relaxed_input_section
*>& new_relaxed_sections
,
2456 // Currently we convert ordinary input sections into relaxed sections only
2458 The_aarch64_input_section
* input_section
;
2459 if (owner
->is_relaxed_input_section())
2463 gold_assert(owner
->is_input_section());
2464 // Create a new relaxed input section. We need to lock the original
2466 Task_lock_obj
<Object
> tl(task
, owner
->relobj());
2468 target
->new_aarch64_input_section(owner
->relobj(), owner
->shndx());
2469 new_relaxed_sections
.push_back(input_section
);
2472 // Create a stub table.
2473 The_stub_table
* stub_table
=
2474 target
->new_stub_table(input_section
);
2476 input_section
->set_stub_table(stub_table
);
2478 Input_section_list::const_iterator p
= first
;
2479 // Look for input sections or relaxed input sections in [first ... last].
2482 if (p
->is_input_section() || p
->is_relaxed_input_section())
2484 // The stub table information for input sections live
2485 // in their objects.
2486 The_aarch64_relobj
* aarch64_relobj
=
2487 static_cast<The_aarch64_relobj
*>(p
->relobj());
2488 aarch64_relobj
->set_stub_table(p
->shndx(), stub_table
);
2491 while (p
++ != last
);
2495 // Group input sections for stub generation. GROUP_SIZE is roughly the limit of
2496 // stub groups. We grow a stub group by adding input section until the size is
2497 // just below GROUP_SIZE. The last input section will be converted into a stub
2498 // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond
2499 // after the stub table, effectively doubling the group size.
2501 // This is similar to the group_sections() function in elf32-arm.c but is
2502 // implemented differently.
2504 template<int size
, bool big_endian
>
2505 void AArch64_output_section
<size
, big_endian
>::group_sections(
2506 section_size_type group_size
,
2507 bool stubs_always_after_branch
,
2508 Target_aarch64
<size
, big_endian
>* target
,
2514 FINDING_STUB_SECTION
,
2518 std::vector
<Output_relaxed_input_section
*> new_relaxed_sections
;
2520 State state
= NO_GROUP
;
2521 section_size_type off
= 0;
2522 section_size_type group_begin_offset
= 0;
2523 section_size_type group_end_offset
= 0;
2524 section_size_type stub_table_end_offset
= 0;
2525 Input_section_list::const_iterator group_begin
=
2526 this->input_sections().end();
2527 Input_section_list::const_iterator stub_table
=
2528 this->input_sections().end();
2529 Input_section_list::const_iterator group_end
= this->input_sections().end();
2530 for (Input_section_list::const_iterator p
= this->input_sections().begin();
2531 p
!= this->input_sections().end();
2534 section_size_type section_begin_offset
=
2535 align_address(off
, p
->addralign());
2536 section_size_type section_end_offset
=
2537 section_begin_offset
+ p
->data_size();
2539 // Check to see if we should group the previously seen sections.
2545 case FINDING_STUB_SECTION
:
2546 // Adding this section makes the group larger than GROUP_SIZE.
2547 if (section_end_offset
- group_begin_offset
>= group_size
)
2549 if (stubs_always_after_branch
)
2551 gold_assert(group_end
!= this->input_sections().end());
2552 this->create_stub_group(group_begin
, group_end
, group_end
,
2553 target
, new_relaxed_sections
,
2559 // Input sections up to stub_group_size bytes after the stub
2560 // table can be handled by it too.
2561 state
= HAS_STUB_SECTION
;
2562 stub_table
= group_end
;
2563 stub_table_end_offset
= group_end_offset
;
2568 case HAS_STUB_SECTION
:
2569 // Adding this section makes the post stub-section group larger
2572 // NOT SUPPORTED YET. For completeness only.
2573 if (section_end_offset
- stub_table_end_offset
>= group_size
)
2575 gold_assert(group_end
!= this->input_sections().end());
2576 this->create_stub_group(group_begin
, group_end
, stub_table
,
2577 target
, new_relaxed_sections
, task
);
2586 // If we see an input section and currently there is no group, start
2587 // a new one. Skip any empty sections. We look at the data size
2588 // instead of calling p->relobj()->section_size() to avoid locking.
2589 if ((p
->is_input_section() || p
->is_relaxed_input_section())
2590 && (p
->data_size() != 0))
2592 if (state
== NO_GROUP
)
2594 state
= FINDING_STUB_SECTION
;
2596 group_begin_offset
= section_begin_offset
;
2599 // Keep track of the last input section seen.
2601 group_end_offset
= section_end_offset
;
2604 off
= section_end_offset
;
2607 // Create a stub group for any ungrouped sections.
2608 if (state
== FINDING_STUB_SECTION
|| state
== HAS_STUB_SECTION
)
2610 gold_assert(group_end
!= this->input_sections().end());
2611 this->create_stub_group(group_begin
, group_end
,
2612 (state
== FINDING_STUB_SECTION
2615 target
, new_relaxed_sections
, task
);
2618 if (!new_relaxed_sections
.empty())
2619 this->convert_input_sections_to_relaxed_sections(new_relaxed_sections
);
2621 // Update the section offsets
2622 for (size_t i
= 0; i
< new_relaxed_sections
.size(); ++i
)
2624 The_aarch64_relobj
* relobj
= static_cast<The_aarch64_relobj
*>(
2625 new_relaxed_sections
[i
]->relobj());
2626 unsigned int shndx
= new_relaxed_sections
[i
]->shndx();
2627 // Tell AArch64_relobj that this input section is converted.
2628 relobj
->convert_input_section_to_relaxed_section(shndx
);
2630 } // End of AArch64_output_section::group_sections
2633 AArch64_reloc_property_table
* aarch64_reloc_property_table
= NULL
;
2636 // The aarch64 target class.
2638 // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf
2639 template<int size
, bool big_endian
>
2640 class Target_aarch64
: public Sized_target
<size
, big_endian
>
2643 typedef Target_aarch64
<size
, big_endian
> This
;
2644 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
2646 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
2647 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
2648 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
2649 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
2650 typedef Erratum_stub
<size
, big_endian
> The_erratum_stub
;
2651 typedef typename Reloc_stub
<size
, big_endian
>::Key The_reloc_stub_key
;
2652 typedef Stub_table
<size
, big_endian
> The_stub_table
;
2653 typedef std::vector
<The_stub_table
*> Stub_table_list
;
2654 typedef typename
Stub_table_list::iterator Stub_table_iterator
;
2655 typedef AArch64_input_section
<size
, big_endian
> The_aarch64_input_section
;
2656 typedef AArch64_output_section
<size
, big_endian
> The_aarch64_output_section
;
2657 typedef Unordered_map
<Section_id
,
2658 AArch64_input_section
<size
, big_endian
>*,
2659 Section_id_hash
> AArch64_input_section_map
;
2660 typedef AArch64_insn_utilities
<big_endian
> Insn_utilities
;
2661 const static int TCB_SIZE
= size
/ 8 * 2;
2663 Target_aarch64(const Target::Target_info
* info
= &aarch64_info
)
2664 : Sized_target
<size
, big_endian
>(info
),
2665 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
2666 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
2667 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_AARCH64_COPY
),
2668 got_mod_index_offset_(-1U),
2669 tlsdesc_reloc_info_(), tls_base_symbol_defined_(false),
2670 stub_tables_(), stub_group_size_(0), aarch64_input_section_map_()
2673 // Scan the relocations to determine unreferenced sections for
2674 // garbage collection.
2676 gc_process_relocs(Symbol_table
* symtab
,
2678 Sized_relobj_file
<size
, big_endian
>* object
,
2679 unsigned int data_shndx
,
2680 unsigned int sh_type
,
2681 const unsigned char* prelocs
,
2683 Output_section
* output_section
,
2684 bool needs_special_offset_handling
,
2685 size_t local_symbol_count
,
2686 const unsigned char* plocal_symbols
);
2688 // Scan the relocations to look for symbol adjustments.
2690 scan_relocs(Symbol_table
* symtab
,
2692 Sized_relobj_file
<size
, big_endian
>* object
,
2693 unsigned int data_shndx
,
2694 unsigned int sh_type
,
2695 const unsigned char* prelocs
,
2697 Output_section
* output_section
,
2698 bool needs_special_offset_handling
,
2699 size_t local_symbol_count
,
2700 const unsigned char* plocal_symbols
);
2702 // Finalize the sections.
2704 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
2706 // Return the value to use for a dynamic which requires special
2709 do_dynsym_value(const Symbol
*) const;
2711 // Relocate a section.
2713 relocate_section(const Relocate_info
<size
, big_endian
>*,
2714 unsigned int sh_type
,
2715 const unsigned char* prelocs
,
2717 Output_section
* output_section
,
2718 bool needs_special_offset_handling
,
2719 unsigned char* view
,
2720 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2721 section_size_type view_size
,
2722 const Reloc_symbol_changes
*);
2724 // Scan the relocs during a relocatable link.
2726 scan_relocatable_relocs(Symbol_table
* symtab
,
2728 Sized_relobj_file
<size
, big_endian
>* object
,
2729 unsigned int data_shndx
,
2730 unsigned int sh_type
,
2731 const unsigned char* prelocs
,
2733 Output_section
* output_section
,
2734 bool needs_special_offset_handling
,
2735 size_t local_symbol_count
,
2736 const unsigned char* plocal_symbols
,
2737 Relocatable_relocs
*);
2739 // Relocate a section during a relocatable link.
2742 const Relocate_info
<size
, big_endian
>*,
2743 unsigned int sh_type
,
2744 const unsigned char* prelocs
,
2746 Output_section
* output_section
,
2747 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
2748 const Relocatable_relocs
*,
2749 unsigned char* view
,
2750 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
2751 section_size_type view_size
,
2752 unsigned char* reloc_view
,
2753 section_size_type reloc_view_size
);
2755 // Return the symbol index to use for a target specific relocation.
2756 // The only target specific relocation is R_AARCH64_TLSDESC for a
2757 // local symbol, which is an absolute reloc.
2759 do_reloc_symbol_index(void*, unsigned int r_type
) const
2761 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
2765 // Return the addend to use for a target specific relocation.
2767 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
2769 // Return the PLT section.
2771 do_plt_address_for_global(const Symbol
* gsym
) const
2772 { return this->plt_section()->address_for_global(gsym
); }
2775 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
2776 { return this->plt_section()->address_for_local(relobj
, symndx
); }
2778 // This function should be defined in targets that can use relocation
2779 // types to determine (implemented in local_reloc_may_be_function_pointer
2780 // and global_reloc_may_be_function_pointer)
2781 // if a function's pointer is taken. ICF uses this in safe mode to only
2782 // fold those functions whose pointer is defintely not taken.
2784 do_can_check_for_function_pointers() const
2787 // Return the number of entries in the PLT.
2789 plt_entry_count() const;
2791 //Return the offset of the first non-reserved PLT entry.
2793 first_plt_entry_offset() const;
2795 // Return the size of each PLT entry.
2797 plt_entry_size() const;
2799 // Create a stub table.
2801 new_stub_table(The_aarch64_input_section
*);
2803 // Create an aarch64 input section.
2804 The_aarch64_input_section
*
2805 new_aarch64_input_section(Relobj
*, unsigned int);
2807 // Find an aarch64 input section instance for a given OBJ and SHNDX.
2808 The_aarch64_input_section
*
2809 find_aarch64_input_section(Relobj
*, unsigned int) const;
2811 // Return the thread control block size.
2813 tcb_size() const { return This::TCB_SIZE
; }
2815 // Scan a section for stub generation.
2817 scan_section_for_stubs(const Relocate_info
<size
, big_endian
>*, unsigned int,
2818 const unsigned char*, size_t, Output_section
*,
2819 bool, const unsigned char*,
2823 // Scan a relocation section for stub.
2824 template<int sh_type
>
2826 scan_reloc_section_for_stubs(
2827 const The_relocate_info
* relinfo
,
2828 const unsigned char* prelocs
,
2830 Output_section
* output_section
,
2831 bool needs_special_offset_handling
,
2832 const unsigned char* view
,
2833 Address view_address
,
2836 // Relocate a single stub.
2838 relocate_stub(The_reloc_stub
*, const Relocate_info
<size
, big_endian
>*,
2839 Output_section
*, unsigned char*, Address
,
2842 // Get the default AArch64 target.
2846 gold_assert(parameters
->target().machine_code() == elfcpp::EM_AARCH64
2847 && parameters
->target().get_size() == size
2848 && parameters
->target().is_big_endian() == big_endian
);
2849 return static_cast<This
*>(parameters
->sized_target
<size
, big_endian
>());
2853 // Scan erratum 843419 for a part of a section.
2855 scan_erratum_843419_span(
2856 AArch64_relobj
<size
, big_endian
>*,
2858 const section_size_type
,
2859 const section_size_type
,
2863 // Scan erratum 835769 for a part of a section.
2865 scan_erratum_835769_span(
2866 AArch64_relobj
<size
, big_endian
>*,
2868 const section_size_type
,
2869 const section_size_type
,
2875 do_select_as_default_target()
2877 gold_assert(aarch64_reloc_property_table
== NULL
);
2878 aarch64_reloc_property_table
= new AArch64_reloc_property_table();
2881 // Add a new reloc argument, returning the index in the vector.
2883 add_tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* object
,
2886 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
2887 return this->tlsdesc_reloc_info_
.size() - 1;
2890 virtual Output_data_plt_aarch64
<size
, big_endian
>*
2891 do_make_data_plt(Layout
* layout
,
2892 Output_data_got_aarch64
<size
, big_endian
>* got
,
2893 Output_data_space
* got_plt
,
2894 Output_data_space
* got_irelative
)
2896 return new Output_data_plt_aarch64_standard
<size
, big_endian
>(
2897 layout
, got
, got_plt
, got_irelative
);
2901 // do_make_elf_object to override the same function in the base class.
2903 do_make_elf_object(const std::string
&, Input_file
*, off_t
,
2904 const elfcpp::Ehdr
<size
, big_endian
>&);
2906 Output_data_plt_aarch64
<size
, big_endian
>*
2907 make_data_plt(Layout
* layout
,
2908 Output_data_got_aarch64
<size
, big_endian
>* got
,
2909 Output_data_space
* got_plt
,
2910 Output_data_space
* got_irelative
)
2912 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
2915 // We only need to generate stubs, and hence perform relaxation if we are
2916 // not doing relocatable linking.
2918 do_may_relax() const
2919 { return !parameters
->options().relocatable(); }
2921 // Relaxation hook. This is where we do stub generation.
2923 do_relax(int, const Input_objects
*, Symbol_table
*, Layout
*, const Task
*);
2926 group_sections(Layout
* layout
,
2927 section_size_type group_size
,
2928 bool stubs_always_after_branch
,
2932 scan_reloc_for_stub(const The_relocate_info
*, unsigned int,
2933 const Sized_symbol
<size
>*, unsigned int,
2934 const Symbol_value
<size
>*,
2935 typename
elfcpp::Elf_types
<size
>::Elf_Swxword
,
2938 // Make an output section.
2940 do_make_output_section(const char* name
, elfcpp::Elf_Word type
,
2941 elfcpp::Elf_Xword flags
)
2942 { return new The_aarch64_output_section(name
, type
, flags
); }
2945 // The class which scans relocations.
2950 : issued_non_pic_error_(false)
2954 local(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
2955 Sized_relobj_file
<size
, big_endian
>* object
,
2956 unsigned int data_shndx
,
2957 Output_section
* output_section
,
2958 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
2959 const elfcpp::Sym
<size
, big_endian
>& lsym
,
2963 global(Symbol_table
* symtab
, Layout
* layout
, Target_aarch64
* target
,
2964 Sized_relobj_file
<size
, big_endian
>* object
,
2965 unsigned int data_shndx
,
2966 Output_section
* output_section
,
2967 const elfcpp::Rela
<size
, big_endian
>& reloc
, unsigned int r_type
,
2971 local_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
2972 Target_aarch64
<size
, big_endian
>* ,
2973 Sized_relobj_file
<size
, big_endian
>* ,
2976 const elfcpp::Rela
<size
, big_endian
>& ,
2977 unsigned int r_type
,
2978 const elfcpp::Sym
<size
, big_endian
>&);
2981 global_reloc_may_be_function_pointer(Symbol_table
* , Layout
* ,
2982 Target_aarch64
<size
, big_endian
>* ,
2983 Sized_relobj_file
<size
, big_endian
>* ,
2986 const elfcpp::Rela
<size
, big_endian
>& ,
2987 unsigned int r_type
,
2992 unsupported_reloc_local(Sized_relobj_file
<size
, big_endian
>*,
2993 unsigned int r_type
);
2996 unsupported_reloc_global(Sized_relobj_file
<size
, big_endian
>*,
2997 unsigned int r_type
, Symbol
*);
3000 possible_function_pointer_reloc(unsigned int r_type
);
3003 check_non_pic(Relobj
*, unsigned int r_type
);
3006 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, big_endian
>*,
3007 unsigned int r_type
);
3009 // Whether we have issued an error about a non-PIC compilation.
3010 bool issued_non_pic_error_
;
3013 // The class which implements relocation.
3018 : skip_call_tls_get_addr_(false)
3024 // Do a relocation. Return false if the caller should not issue
3025 // any warnings about this relocation.
3027 relocate(const Relocate_info
<size
, big_endian
>*, Target_aarch64
*,
3029 size_t relnum
, const elfcpp::Rela
<size
, big_endian
>&,
3030 unsigned int r_type
, const Sized_symbol
<size
>*,
3031 const Symbol_value
<size
>*,
3032 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3036 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3037 relocate_tls(const Relocate_info
<size
, big_endian
>*,
3038 Target_aarch64
<size
, big_endian
>*,
3040 const elfcpp::Rela
<size
, big_endian
>&,
3041 unsigned int r_type
, const Sized_symbol
<size
>*,
3042 const Symbol_value
<size
>*,
3044 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3046 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3048 const Relocate_info
<size
, big_endian
>*,
3049 Target_aarch64
<size
, big_endian
>*,
3050 const elfcpp::Rela
<size
, big_endian
>&,
3053 const Symbol_value
<size
>*);
3055 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3057 const Relocate_info
<size
, big_endian
>*,
3058 Target_aarch64
<size
, big_endian
>*,
3059 const elfcpp::Rela
<size
, big_endian
>&,
3062 const Symbol_value
<size
>*);
3064 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3066 const Relocate_info
<size
, big_endian
>*,
3067 Target_aarch64
<size
, big_endian
>*,
3068 const elfcpp::Rela
<size
, big_endian
>&,
3071 const Symbol_value
<size
>*);
3073 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3075 const Relocate_info
<size
, big_endian
>*,
3076 Target_aarch64
<size
, big_endian
>*,
3077 const elfcpp::Rela
<size
, big_endian
>&,
3080 const Symbol_value
<size
>*);
3082 inline typename AArch64_relocate_functions
<size
, big_endian
>::Status
3084 const Relocate_info
<size
, big_endian
>*,
3085 Target_aarch64
<size
, big_endian
>*,
3086 const elfcpp::Rela
<size
, big_endian
>&,
3089 const Symbol_value
<size
>*,
3090 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
3091 typename
elfcpp::Elf_types
<size
>::Elf_Addr
);
3093 bool skip_call_tls_get_addr_
;
3095 }; // End of class Relocate
3097 // A class which returns the size required for a relocation type,
3098 // used while scanning relocs during a relocatable link.
3099 class Relocatable_size_for_reloc
3103 get_size_for_reloc(unsigned int, Relobj
*);
3106 // Adjust TLS relocation type based on the options and whether this
3107 // is a local symbol.
3108 static tls::Tls_optimization
3109 optimize_tls_reloc(bool is_final
, int r_type
);
3111 // Get the GOT section, creating it if necessary.
3112 Output_data_got_aarch64
<size
, big_endian
>*
3113 got_section(Symbol_table
*, Layout
*);
3115 // Get the GOT PLT section.
3117 got_plt_section() const
3119 gold_assert(this->got_plt_
!= NULL
);
3120 return this->got_plt_
;
3123 // Get the GOT section for TLSDESC entries.
3124 Output_data_got
<size
, big_endian
>*
3125 got_tlsdesc_section() const
3127 gold_assert(this->got_tlsdesc_
!= NULL
);
3128 return this->got_tlsdesc_
;
3131 // Create the PLT section.
3133 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
3135 // Create a PLT entry for a global symbol.
3137 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
3139 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
3141 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
3142 Sized_relobj_file
<size
, big_endian
>* relobj
,
3143 unsigned int local_sym_index
);
3145 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
3147 define_tls_base_symbol(Symbol_table
*, Layout
*);
3149 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3151 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
3153 // Create a GOT entry for the TLS module index.
3155 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
3156 Sized_relobj_file
<size
, big_endian
>* object
);
3158 // Get the PLT section.
3159 Output_data_plt_aarch64
<size
, big_endian
>*
3162 gold_assert(this->plt_
!= NULL
);
3166 // Helper method to create erratum stubs for ST_E_843419 and ST_E_835769.
3167 void create_erratum_stub(
3168 AArch64_relobj
<size
, big_endian
>* relobj
,
3170 section_size_type erratum_insn_offset
,
3171 Address erratum_address
,
3172 typename
Insn_utilities::Insntype erratum_insn
,
3175 // Return whether this is a 3-insn erratum sequence.
3176 bool is_erratum_843419_sequence(
3177 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
3178 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
3179 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
);
3181 // Return whether this is a 835769 sequence.
3182 // (Similarly implemented as in elfnn-aarch64.c.)
3183 bool is_erratum_835769_sequence(
3184 typename
elfcpp::Swap
<32,big_endian
>::Valtype
,
3185 typename
elfcpp::Swap
<32,big_endian
>::Valtype
);
3187 // Get the dynamic reloc section, creating it if necessary.
3189 rela_dyn_section(Layout
*);
3191 // Get the section to use for TLSDESC relocations.
3193 rela_tlsdesc_section(Layout
*) const;
3195 // Get the section to use for IRELATIVE relocations.
3197 rela_irelative_section(Layout
*);
3199 // Add a potential copy relocation.
3201 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
3202 Sized_relobj_file
<size
, big_endian
>* object
,
3203 unsigned int shndx
, Output_section
* output_section
,
3204 Symbol
* sym
, const elfcpp::Rela
<size
, big_endian
>& reloc
)
3206 this->copy_relocs_
.copy_reloc(symtab
, layout
,
3207 symtab
->get_sized_symbol
<size
>(sym
),
3208 object
, shndx
, output_section
,
3209 reloc
, this->rela_dyn_section(layout
));
3212 // Information about this specific target which we pass to the
3213 // general Target structure.
3214 static const Target::Target_info aarch64_info
;
3216 // The types of GOT entries needed for this platform.
3217 // These values are exposed to the ABI in an incremental link.
3218 // Do not renumber existing values without changing the version
3219 // number of the .gnu_incremental_inputs section.
3222 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
3223 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
3224 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
3225 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
3228 // This type is used as the argument to the target specific
3229 // relocation routines. The only target specific reloc is
3230 // R_AARCh64_TLSDESC against a local symbol.
3233 Tlsdesc_info(Sized_relobj_file
<size
, big_endian
>* a_object
,
3234 unsigned int a_r_sym
)
3235 : object(a_object
), r_sym(a_r_sym
)
3238 // The object in which the local symbol is defined.
3239 Sized_relobj_file
<size
, big_endian
>* object
;
3240 // The local symbol index in the object.
3245 Output_data_got_aarch64
<size
, big_endian
>* got_
;
3247 Output_data_plt_aarch64
<size
, big_endian
>* plt_
;
3248 // The GOT PLT section.
3249 Output_data_space
* got_plt_
;
3250 // The GOT section for IRELATIVE relocations.
3251 Output_data_space
* got_irelative_
;
3252 // The GOT section for TLSDESC relocations.
3253 Output_data_got
<size
, big_endian
>* got_tlsdesc_
;
3254 // The _GLOBAL_OFFSET_TABLE_ symbol.
3255 Symbol
* global_offset_table_
;
3256 // The dynamic reloc section.
3257 Reloc_section
* rela_dyn_
;
3258 // The section to use for IRELATIVE relocs.
3259 Reloc_section
* rela_irelative_
;
3260 // Relocs saved to avoid a COPY reloc.
3261 Copy_relocs
<elfcpp::SHT_RELA
, size
, big_endian
> copy_relocs_
;
3262 // Offset of the GOT entry for the TLS module index.
3263 unsigned int got_mod_index_offset_
;
3264 // We handle R_AARCH64_TLSDESC against a local symbol as a target
3265 // specific relocation. Here we store the object and local symbol
3266 // index for the relocation.
3267 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
3268 // True if the _TLS_MODULE_BASE_ symbol has been defined.
3269 bool tls_base_symbol_defined_
;
3270 // List of stub_tables
3271 Stub_table_list stub_tables_
;
3272 // Actual stub group size
3273 section_size_type stub_group_size_
;
3274 AArch64_input_section_map aarch64_input_section_map_
;
3275 }; // End of Target_aarch64
3279 const Target::Target_info Target_aarch64
<64, false>::aarch64_info
=
3282 false, // is_big_endian
3283 elfcpp::EM_AARCH64
, // machine_code
3284 false, // has_make_symbol
3285 false, // has_resolve
3286 false, // has_code_fill
3287 true, // is_default_stack_executable
3288 true, // can_icf_inline_merge_sections
3290 "/lib/ld.so.1", // program interpreter
3291 0x400000, // default_text_segment_address
3292 0x1000, // abi_pagesize (overridable by -z max-page-size)
3293 0x1000, // common_pagesize (overridable by -z common-page-size)
3294 false, // isolate_execinstr
3296 elfcpp::SHN_UNDEF
, // small_common_shndx
3297 elfcpp::SHN_UNDEF
, // large_common_shndx
3298 0, // small_common_section_flags
3299 0, // large_common_section_flags
3300 NULL
, // attributes_section
3301 NULL
, // attributes_vendor
3302 "_start" // entry_symbol_name
3306 const Target::Target_info Target_aarch64
<32, false>::aarch64_info
=
3309 false, // is_big_endian
3310 elfcpp::EM_AARCH64
, // machine_code
3311 false, // has_make_symbol
3312 false, // has_resolve
3313 false, // has_code_fill
3314 true, // is_default_stack_executable
3315 false, // can_icf_inline_merge_sections
3317 "/lib/ld.so.1", // program interpreter
3318 0x400000, // default_text_segment_address
3319 0x1000, // abi_pagesize (overridable by -z max-page-size)
3320 0x1000, // common_pagesize (overridable by -z common-page-size)
3321 false, // isolate_execinstr
3323 elfcpp::SHN_UNDEF
, // small_common_shndx
3324 elfcpp::SHN_UNDEF
, // large_common_shndx
3325 0, // small_common_section_flags
3326 0, // large_common_section_flags
3327 NULL
, // attributes_section
3328 NULL
, // attributes_vendor
3329 "_start" // entry_symbol_name
3333 const Target::Target_info Target_aarch64
<64, true>::aarch64_info
=
3336 true, // is_big_endian
3337 elfcpp::EM_AARCH64
, // machine_code
3338 false, // has_make_symbol
3339 false, // has_resolve
3340 false, // has_code_fill
3341 true, // is_default_stack_executable
3342 true, // can_icf_inline_merge_sections
3344 "/lib/ld.so.1", // program interpreter
3345 0x400000, // default_text_segment_address
3346 0x1000, // abi_pagesize (overridable by -z max-page-size)
3347 0x1000, // common_pagesize (overridable by -z common-page-size)
3348 false, // isolate_execinstr
3350 elfcpp::SHN_UNDEF
, // small_common_shndx
3351 elfcpp::SHN_UNDEF
, // large_common_shndx
3352 0, // small_common_section_flags
3353 0, // large_common_section_flags
3354 NULL
, // attributes_section
3355 NULL
, // attributes_vendor
3356 "_start" // entry_symbol_name
3360 const Target::Target_info Target_aarch64
<32, true>::aarch64_info
=
3363 true, // is_big_endian
3364 elfcpp::EM_AARCH64
, // machine_code
3365 false, // has_make_symbol
3366 false, // has_resolve
3367 false, // has_code_fill
3368 true, // is_default_stack_executable
3369 false, // can_icf_inline_merge_sections
3371 "/lib/ld.so.1", // program interpreter
3372 0x400000, // default_text_segment_address
3373 0x1000, // abi_pagesize (overridable by -z max-page-size)
3374 0x1000, // common_pagesize (overridable by -z common-page-size)
3375 false, // isolate_execinstr
3377 elfcpp::SHN_UNDEF
, // small_common_shndx
3378 elfcpp::SHN_UNDEF
, // large_common_shndx
3379 0, // small_common_section_flags
3380 0, // large_common_section_flags
3381 NULL
, // attributes_section
3382 NULL
, // attributes_vendor
3383 "_start" // entry_symbol_name
3386 // Get the GOT section, creating it if necessary.
3388 template<int size
, bool big_endian
>
3389 Output_data_got_aarch64
<size
, big_endian
>*
3390 Target_aarch64
<size
, big_endian
>::got_section(Symbol_table
* symtab
,
3393 if (this->got_
== NULL
)
3395 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
3397 // When using -z now, we can treat .got.plt as a relro section.
3398 // Without -z now, it is modified after program startup by lazy
3400 bool is_got_plt_relro
= parameters
->options().now();
3401 Output_section_order got_order
= (is_got_plt_relro
3403 : ORDER_RELRO_LAST
);
3404 Output_section_order got_plt_order
= (is_got_plt_relro
3406 : ORDER_NON_RELRO_FIRST
);
3408 // Layout of .got and .got.plt sections.
3409 // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_
3411 // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT
3412 // .gotplt[1] reserved for ld.so (resolver)
3413 // .gotplt[2] reserved
3415 // Generate .got section.
3416 this->got_
= new Output_data_got_aarch64
<size
, big_endian
>(symtab
,
3418 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
3419 (elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
),
3420 this->got_
, got_order
, true);
3421 // The first word of GOT is reserved for the address of .dynamic.
3422 // We put 0 here now. The value will be replaced later in
3423 // Output_data_got_aarch64::do_write.
3424 this->got_
->add_constant(0);
3426 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3427 // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section,
3428 // even if there is a .got.plt section.
3429 this->global_offset_table_
=
3430 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
3431 Symbol_table::PREDEFINED
,
3433 0, 0, elfcpp::STT_OBJECT
,
3435 elfcpp::STV_HIDDEN
, 0,
3438 // Generate .got.plt section.
3439 this->got_plt_
= new Output_data_space(size
/ 8, "** GOT PLT");
3440 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3442 | elfcpp::SHF_WRITE
),
3443 this->got_plt_
, got_plt_order
,
3446 // The first three entries are reserved.
3447 this->got_plt_
->set_current_data_size(
3448 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3450 // If there are any IRELATIVE relocations, they get GOT entries
3451 // in .got.plt after the jump slot entries.
3452 this->got_irelative_
= new Output_data_space(size
/ 8,
3453 "** GOT IRELATIVE PLT");
3454 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3456 | elfcpp::SHF_WRITE
),
3457 this->got_irelative_
,
3461 // If there are any TLSDESC relocations, they get GOT entries in
3462 // .got.plt after the jump slot and IRELATIVE entries.
3463 this->got_tlsdesc_
= new Output_data_got
<size
, big_endian
>();
3464 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
3466 | elfcpp::SHF_WRITE
),
3471 if (!is_got_plt_relro
)
3473 // Those bytes can go into the relro segment.
3474 layout
->increase_relro(
3475 AARCH64_GOTPLT_RESERVE_COUNT
* (size
/ 8));
3482 // Get the dynamic reloc section, creating it if necessary.
3484 template<int size
, bool big_endian
>
3485 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3486 Target_aarch64
<size
, big_endian
>::rela_dyn_section(Layout
* layout
)
3488 if (this->rela_dyn_
== NULL
)
3490 gold_assert(layout
!= NULL
);
3491 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
3492 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3493 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
3494 ORDER_DYNAMIC_RELOCS
, false);
3496 return this->rela_dyn_
;
3499 // Get the section to use for IRELATIVE relocs, creating it if
3500 // necessary. These go in .rela.dyn, but only after all other dynamic
3501 // relocations. They need to follow the other dynamic relocations so
3502 // that they can refer to global variables initialized by those
3505 template<int size
, bool big_endian
>
3506 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
3507 Target_aarch64
<size
, big_endian
>::rela_irelative_section(Layout
* layout
)
3509 if (this->rela_irelative_
== NULL
)
3511 // Make sure we have already created the dynamic reloc section.
3512 this->rela_dyn_section(layout
);
3513 this->rela_irelative_
= new Reloc_section(false);
3514 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
3515 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
3516 ORDER_DYNAMIC_RELOCS
, false);
3517 gold_assert(this->rela_dyn_
->output_section()
3518 == this->rela_irelative_
->output_section());
3520 return this->rela_irelative_
;
3524 // do_make_elf_object to override the same function in the base class. We need
3525 // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to
3526 // store backend specific information. Hence we need to have our own ELF object
3529 template<int size
, bool big_endian
>
3531 Target_aarch64
<size
, big_endian
>::do_make_elf_object(
3532 const std::string
& name
,
3533 Input_file
* input_file
,
3534 off_t offset
, const elfcpp::Ehdr
<size
, big_endian
>& ehdr
)
3536 int et
= ehdr
.get_e_type();
3537 // ET_EXEC files are valid input for --just-symbols/-R,
3538 // and we treat them as relocatable objects.
3539 if (et
== elfcpp::ET_EXEC
&& input_file
->just_symbols())
3540 return Sized_target
<size
, big_endian
>::do_make_elf_object(
3541 name
, input_file
, offset
, ehdr
);
3542 else if (et
== elfcpp::ET_REL
)
3544 AArch64_relobj
<size
, big_endian
>* obj
=
3545 new AArch64_relobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3549 else if (et
== elfcpp::ET_DYN
)
3551 // Keep base implementation.
3552 Sized_dynobj
<size
, big_endian
>* obj
=
3553 new Sized_dynobj
<size
, big_endian
>(name
, input_file
, offset
, ehdr
);
3559 gold_error(_("%s: unsupported ELF file type %d"),
3566 // Scan a relocation for stub generation.
3568 template<int size
, bool big_endian
>
3570 Target_aarch64
<size
, big_endian
>::scan_reloc_for_stub(
3571 const Relocate_info
<size
, big_endian
>* relinfo
,
3572 unsigned int r_type
,
3573 const Sized_symbol
<size
>* gsym
,
3575 const Symbol_value
<size
>* psymval
,
3576 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
,
3579 const AArch64_relobj
<size
, big_endian
>* aarch64_relobj
=
3580 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3582 Symbol_value
<size
> symval
;
3585 const AArch64_reloc_property
* arp
= aarch64_reloc_property_table
->
3586 get_reloc_property(r_type
);
3587 if (gsym
->use_plt_offset(arp
->reference_flags()))
3589 // This uses a PLT, change the symbol value.
3590 symval
.set_output_value(this->plt_section()->address()
3591 + gsym
->plt_offset());
3594 else if (gsym
->is_undefined())
3595 // There is no need to generate a stub symbol is undefined.
3599 // Get the symbol value.
3600 typename Symbol_value
<size
>::Value value
= psymval
->value(aarch64_relobj
, 0);
3602 // Owing to pipelining, the PC relative branches below actually skip
3603 // two instructions when the branch offset is 0.
3604 Address destination
= static_cast<Address
>(-1);
3607 case elfcpp::R_AARCH64_CALL26
:
3608 case elfcpp::R_AARCH64_JUMP26
:
3609 destination
= value
+ addend
;
3615 int stub_type
= The_reloc_stub::
3616 stub_type_for_reloc(r_type
, address
, destination
);
3617 if (stub_type
== ST_NONE
)
3620 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
3621 gold_assert(stub_table
!= NULL
);
3623 The_reloc_stub_key
key(stub_type
, gsym
, aarch64_relobj
, r_sym
, addend
);
3624 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(key
);
3627 stub
= new The_reloc_stub(stub_type
);
3628 stub_table
->add_reloc_stub(stub
, key
);
3630 stub
->set_destination_address(destination
);
3631 } // End of Target_aarch64::scan_reloc_for_stub
3634 // This function scans a relocation section for stub generation.
3635 // The template parameter Relocate must be a class type which provides
3636 // a single function, relocate(), which implements the machine
3637 // specific part of a relocation.
3639 // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type:
3640 // SHT_REL or SHT_RELA.
3642 // PRELOCS points to the relocation data. RELOC_COUNT is the number
3643 // of relocs. OUTPUT_SECTION is the output section.
3644 // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be
3645 // mapped to output offsets.
3647 // VIEW is the section data, VIEW_ADDRESS is its memory address, and
3648 // VIEW_SIZE is the size. These refer to the input section, unless
3649 // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to
3650 // the output section.
3652 template<int size
, bool big_endian
>
3653 template<int sh_type
>
3655 Target_aarch64
<size
, big_endian
>::scan_reloc_section_for_stubs(
3656 const Relocate_info
<size
, big_endian
>* relinfo
,
3657 const unsigned char* prelocs
,
3659 Output_section
* /*output_section*/,
3660 bool /*needs_special_offset_handling*/,
3661 const unsigned char* /*view*/,
3662 Address view_address
,
3665 typedef typename Reloc_types
<sh_type
,size
,big_endian
>::Reloc Reltype
;
3667 const int reloc_size
=
3668 Reloc_types
<sh_type
,size
,big_endian
>::reloc_size
;
3669 AArch64_relobj
<size
, big_endian
>* object
=
3670 static_cast<AArch64_relobj
<size
, big_endian
>*>(relinfo
->object
);
3671 unsigned int local_count
= object
->local_symbol_count();
3673 gold::Default_comdat_behavior default_comdat_behavior
;
3674 Comdat_behavior comdat_behavior
= CB_UNDETERMINED
;
3676 for (size_t i
= 0; i
< reloc_count
; ++i
, prelocs
+= reloc_size
)
3678 Reltype
reloc(prelocs
);
3679 typename
elfcpp::Elf_types
<size
>::Elf_WXword r_info
= reloc
.get_r_info();
3680 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(r_info
);
3681 unsigned int r_type
= elfcpp::elf_r_type
<size
>(r_info
);
3682 if (r_type
!= elfcpp::R_AARCH64_CALL26
3683 && r_type
!= elfcpp::R_AARCH64_JUMP26
)
3686 section_offset_type offset
=
3687 convert_to_section_size_type(reloc
.get_r_offset());
3690 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
=
3691 reloc
.get_r_addend();
3693 const Sized_symbol
<size
>* sym
;
3694 Symbol_value
<size
> symval
;
3695 const Symbol_value
<size
> *psymval
;
3696 bool is_defined_in_discarded_section
;
3698 if (r_sym
< local_count
)
3701 psymval
= object
->local_symbol(r_sym
);
3703 // If the local symbol belongs to a section we are discarding,
3704 // and that section is a debug section, try to find the
3705 // corresponding kept section and map this symbol to its
3706 // counterpart in the kept section. The symbol must not
3707 // correspond to a section we are folding.
3709 shndx
= psymval
->input_shndx(&is_ordinary
);
3710 is_defined_in_discarded_section
=
3712 && shndx
!= elfcpp::SHN_UNDEF
3713 && !object
->is_section_included(shndx
)
3714 && !relinfo
->symtab
->is_section_folded(object
, shndx
));
3716 // We need to compute the would-be final value of this local
3718 if (!is_defined_in_discarded_section
)
3720 typedef Sized_relobj_file
<size
, big_endian
> ObjType
;
3721 typename
ObjType::Compute_final_local_value_status status
=
3722 object
->compute_final_local_value(r_sym
, psymval
, &symval
,
3724 if (status
== ObjType::CFLV_OK
)
3726 // Currently we cannot handle a branch to a target in
3727 // a merged section. If this is the case, issue an error
3728 // and also free the merge symbol value.
3729 if (!symval
.has_output_value())
3731 const std::string
& section_name
=
3732 object
->section_name(shndx
);
3733 object
->error(_("cannot handle branch to local %u "
3734 "in a merged section %s"),
3735 r_sym
, section_name
.c_str());
3741 // We cannot determine the final value.
3749 gsym
= object
->global_symbol(r_sym
);
3750 gold_assert(gsym
!= NULL
);
3751 if (gsym
->is_forwarder())
3752 gsym
= relinfo
->symtab
->resolve_forwards(gsym
);
3754 sym
= static_cast<const Sized_symbol
<size
>*>(gsym
);
3755 if (sym
->has_symtab_index() && sym
->symtab_index() != -1U)
3756 symval
.set_output_symtab_index(sym
->symtab_index());
3758 symval
.set_no_output_symtab_entry();
3760 // We need to compute the would-be final value of this global
3762 const Symbol_table
* symtab
= relinfo
->symtab
;
3763 const Sized_symbol
<size
>* sized_symbol
=
3764 symtab
->get_sized_symbol
<size
>(gsym
);
3765 Symbol_table::Compute_final_value_status status
;
3766 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3767 symtab
->compute_final_value
<size
>(sized_symbol
, &status
);
3769 // Skip this if the symbol has not output section.
3770 if (status
== Symbol_table::CFVS_NO_OUTPUT_SECTION
)
3772 symval
.set_output_value(value
);
3774 if (gsym
->type() == elfcpp::STT_TLS
)
3775 symval
.set_is_tls_symbol();
3776 else if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
3777 symval
.set_is_ifunc_symbol();
3780 is_defined_in_discarded_section
=
3781 (gsym
->is_defined_in_discarded_section()
3782 && gsym
->is_undefined());
3786 Symbol_value
<size
> symval2
;
3787 if (is_defined_in_discarded_section
)
3789 if (comdat_behavior
== CB_UNDETERMINED
)
3791 std::string name
= object
->section_name(relinfo
->data_shndx
);
3792 comdat_behavior
= default_comdat_behavior
.get(name
.c_str());
3794 if (comdat_behavior
== CB_PRETEND
)
3797 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
=
3798 object
->map_to_kept_section(shndx
, &found
);
3800 symval2
.set_output_value(value
+ psymval
->input_value());
3802 symval2
.set_output_value(0);
3806 if (comdat_behavior
== CB_WARNING
)
3807 gold_warning_at_location(relinfo
, i
, offset
,
3808 _("relocation refers to discarded "
3810 symval2
.set_output_value(0);
3812 symval2
.set_no_output_symtab_entry();
3816 // If symbol is a section symbol, we don't know the actual type of
3817 // destination. Give up.
3818 if (psymval
->is_section_symbol())
3821 this->scan_reloc_for_stub(relinfo
, r_type
, sym
, r_sym
, psymval
,
3822 addend
, view_address
+ offset
);
3823 } // End of iterating relocs in a section
3824 } // End of Target_aarch64::scan_reloc_section_for_stubs
3827 // Scan an input section for stub generation.
3829 template<int size
, bool big_endian
>
3831 Target_aarch64
<size
, big_endian
>::scan_section_for_stubs(
3832 const Relocate_info
<size
, big_endian
>* relinfo
,
3833 unsigned int sh_type
,
3834 const unsigned char* prelocs
,
3836 Output_section
* output_section
,
3837 bool needs_special_offset_handling
,
3838 const unsigned char* view
,
3839 Address view_address
,
3840 section_size_type view_size
)
3842 gold_assert(sh_type
== elfcpp::SHT_RELA
);
3843 this->scan_reloc_section_for_stubs
<elfcpp::SHT_RELA
>(
3848 needs_special_offset_handling
,
3855 // Relocate a single stub.
3857 template<int size
, bool big_endian
>
3858 void Target_aarch64
<size
, big_endian
>::
3859 relocate_stub(The_reloc_stub
* stub
,
3860 const The_relocate_info
*,
3862 unsigned char* view
,
3866 typedef AArch64_relocate_functions
<size
, big_endian
> The_reloc_functions
;
3867 typedef typename
The_reloc_functions::Status The_reloc_functions_status
;
3868 typedef typename
elfcpp::Swap
<32,big_endian
>::Valtype Insntype
;
3870 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
3871 int insn_number
= stub
->insn_num();
3872 const uint32_t* insns
= stub
->insns();
3873 // Check the insns are really those stub insns.
3874 for (int i
= 0; i
< insn_number
; ++i
)
3876 Insntype insn
= elfcpp::Swap
<32,big_endian
>::readval(ip
+ i
);
3877 gold_assert(((uint32_t)insn
== insns
[i
]));
3880 Address dest
= stub
->destination_address();
3882 switch(stub
->type())
3884 case ST_ADRP_BRANCH
:
3886 // 1st reloc is ADR_PREL_PG_HI21
3887 The_reloc_functions_status status
=
3888 The_reloc_functions::adrp(view
, dest
, address
);
3889 // An error should never arise in the above step. If so, please
3890 // check 'aarch64_valid_for_adrp_p'.
3891 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
3893 // 2nd reloc is ADD_ABS_LO12_NC
3894 const AArch64_reloc_property
* arp
=
3895 aarch64_reloc_property_table
->get_reloc_property(
3896 elfcpp::R_AARCH64_ADD_ABS_LO12_NC
);
3897 gold_assert(arp
!= NULL
);
3898 status
= The_reloc_functions::template
3899 rela_general
<32>(view
+ 4, dest
, 0, arp
);
3900 // An error should never arise, it is an "_NC" relocation.
3901 gold_assert(status
== The_reloc_functions::STATUS_OKAY
);
3905 case ST_LONG_BRANCH_ABS
:
3906 // 1st reloc is R_AARCH64_PREL64, at offset 8
3907 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 8, dest
);
3910 case ST_LONG_BRANCH_PCREL
:
3912 // "PC" calculation is the 2nd insn in the stub.
3913 uint64_t offset
= dest
- (address
+ 4);
3914 // Offset is placed at offset 4 and 5.
3915 elfcpp::Swap
<64,big_endian
>::writeval(view
+ 16, offset
);
3925 // A class to handle the PLT data.
3926 // This is an abstract base class that handles most of the linker details
3927 // but does not know the actual contents of PLT entries. The derived
3928 // classes below fill in those details.
3930 template<int size
, bool big_endian
>
3931 class Output_data_plt_aarch64
: public Output_section_data
3934 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
3936 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
3938 Output_data_plt_aarch64(Layout
* layout
,
3940 Output_data_got_aarch64
<size
, big_endian
>* got
,
3941 Output_data_space
* got_plt
,
3942 Output_data_space
* got_irelative
)
3943 : Output_section_data(addralign
), tlsdesc_rel_(NULL
), irelative_rel_(NULL
),
3944 got_(got
), got_plt_(got_plt
), got_irelative_(got_irelative
),
3945 count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U)
3946 { this->init(layout
); }
3948 // Initialize the PLT section.
3950 init(Layout
* layout
);
3952 // Add an entry to the PLT.
3954 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
3956 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
3958 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
3959 Sized_relobj_file
<size
, big_endian
>* relobj
,
3960 unsigned int local_sym_index
);
3962 // Add the relocation for a PLT entry.
3964 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
3965 unsigned int got_offset
);
3967 // Add the reserved TLSDESC_PLT entry to the PLT.
3969 reserve_tlsdesc_entry(unsigned int got_offset
)
3970 { this->tlsdesc_got_offset_
= got_offset
; }
3972 // Return true if a TLSDESC_PLT entry has been reserved.
3974 has_tlsdesc_entry() const
3975 { return this->tlsdesc_got_offset_
!= -1U; }
3977 // Return the GOT offset for the reserved TLSDESC_PLT entry.
3979 get_tlsdesc_got_offset() const
3980 { return this->tlsdesc_got_offset_
; }
3982 // Return the PLT offset of the reserved TLSDESC_PLT entry.
3984 get_tlsdesc_plt_offset() const
3986 return (this->first_plt_entry_offset() +
3987 (this->count_
+ this->irelative_count_
)
3988 * this->get_plt_entry_size());
3991 // Return the .rela.plt section data.
3994 { return this->rel_
; }
3996 // Return where the TLSDESC relocations should go.
3998 rela_tlsdesc(Layout
*);
4000 // Return where the IRELATIVE relocations should go in the PLT
4003 rela_irelative(Symbol_table
*, Layout
*);
4005 // Return whether we created a section for IRELATIVE relocations.
4007 has_irelative_section() const
4008 { return this->irelative_rel_
!= NULL
; }
4010 // Return the number of PLT entries.
4013 { return this->count_
+ this->irelative_count_
; }
4015 // Return the offset of the first non-reserved PLT entry.
4017 first_plt_entry_offset() const
4018 { return this->do_first_plt_entry_offset(); }
4020 // Return the size of a PLT entry.
4022 get_plt_entry_size() const
4023 { return this->do_get_plt_entry_size(); }
4025 // Return the reserved tlsdesc entry size.
4027 get_plt_tlsdesc_entry_size() const
4028 { return this->do_get_plt_tlsdesc_entry_size(); }
4030 // Return the PLT address to use for a global symbol.
4032 address_for_global(const Symbol
*);
4034 // Return the PLT address to use for a local symbol.
4036 address_for_local(const Relobj
*, unsigned int symndx
);
4039 // Fill in the first PLT entry.
4041 fill_first_plt_entry(unsigned char* pov
,
4042 Address got_address
,
4043 Address plt_address
)
4044 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
4046 // Fill in a normal PLT entry.
4048 fill_plt_entry(unsigned char* pov
,
4049 Address got_address
,
4050 Address plt_address
,
4051 unsigned int got_offset
,
4052 unsigned int plt_offset
)
4054 this->do_fill_plt_entry(pov
, got_address
, plt_address
,
4055 got_offset
, plt_offset
);
4058 // Fill in the reserved TLSDESC PLT entry.
4060 fill_tlsdesc_entry(unsigned char* pov
,
4061 Address gotplt_address
,
4062 Address plt_address
,
4064 unsigned int tlsdesc_got_offset
,
4065 unsigned int plt_offset
)
4067 this->do_fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4068 tlsdesc_got_offset
, plt_offset
);
4071 virtual unsigned int
4072 do_first_plt_entry_offset() const = 0;
4074 virtual unsigned int
4075 do_get_plt_entry_size() const = 0;
4077 virtual unsigned int
4078 do_get_plt_tlsdesc_entry_size() const = 0;
4081 do_fill_first_plt_entry(unsigned char* pov
,
4083 Address plt_addr
) = 0;
4086 do_fill_plt_entry(unsigned char* pov
,
4087 Address got_address
,
4088 Address plt_address
,
4089 unsigned int got_offset
,
4090 unsigned int plt_offset
) = 0;
4093 do_fill_tlsdesc_entry(unsigned char* pov
,
4094 Address gotplt_address
,
4095 Address plt_address
,
4097 unsigned int tlsdesc_got_offset
,
4098 unsigned int plt_offset
) = 0;
4101 do_adjust_output_section(Output_section
* os
);
4103 // Write to a map file.
4105 do_print_to_mapfile(Mapfile
* mapfile
) const
4106 { mapfile
->print_output_data(this, _("** PLT")); }
4109 // Set the final size.
4111 set_final_data_size();
4113 // Write out the PLT data.
4115 do_write(Output_file
*);
4117 // The reloc section.
4118 Reloc_section
* rel_
;
4120 // The TLSDESC relocs, if necessary. These must follow the regular
4122 Reloc_section
* tlsdesc_rel_
;
4124 // The IRELATIVE relocs, if necessary. These must follow the
4125 // regular PLT relocations.
4126 Reloc_section
* irelative_rel_
;
4128 // The .got section.
4129 Output_data_got_aarch64
<size
, big_endian
>* got_
;
4131 // The .got.plt section.
4132 Output_data_space
* got_plt_
;
4134 // The part of the .got.plt section used for IRELATIVE relocs.
4135 Output_data_space
* got_irelative_
;
4137 // The number of PLT entries.
4138 unsigned int count_
;
4140 // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These
4141 // follow the regular PLT entries.
4142 unsigned int irelative_count_
;
4144 // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline.
4145 // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1
4146 // indicates an offset is not allocated.
4147 unsigned int tlsdesc_got_offset_
;
4150 // Initialize the PLT section.
4152 template<int size
, bool big_endian
>
4154 Output_data_plt_aarch64
<size
, big_endian
>::init(Layout
* layout
)
4156 this->rel_
= new Reloc_section(false);
4157 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4158 elfcpp::SHF_ALLOC
, this->rel_
,
4159 ORDER_DYNAMIC_PLT_RELOCS
, false);
4162 template<int size
, bool big_endian
>
4164 Output_data_plt_aarch64
<size
, big_endian
>::do_adjust_output_section(
4167 os
->set_entsize(this->get_plt_entry_size());
4170 // Add an entry to the PLT.
4172 template<int size
, bool big_endian
>
4174 Output_data_plt_aarch64
<size
, big_endian
>::add_entry(Symbol_table
* symtab
,
4175 Layout
* layout
, Symbol
* gsym
)
4177 gold_assert(!gsym
->has_plt_offset());
4179 unsigned int* pcount
;
4180 unsigned int plt_reserved
;
4181 Output_section_data_build
* got
;
4183 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4184 && gsym
->can_use_relative_reloc(false))
4186 pcount
= &this->irelative_count_
;
4188 got
= this->got_irelative_
;
4192 pcount
= &this->count_
;
4193 plt_reserved
= this->first_plt_entry_offset();
4194 got
= this->got_plt_
;
4197 gsym
->set_plt_offset((*pcount
) * this->get_plt_entry_size()
4202 section_offset_type got_offset
= got
->current_data_size();
4204 // Every PLT entry needs a GOT entry which points back to the PLT
4205 // entry (this will be changed by the dynamic linker, normally
4206 // lazily when the function is called).
4207 got
->set_current_data_size(got_offset
+ size
/ 8);
4209 // Every PLT entry needs a reloc.
4210 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
4212 // Note that we don't need to save the symbol. The contents of the
4213 // PLT are independent of which symbols are used. The symbols only
4214 // appear in the relocations.
4217 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
4220 template<int size
, bool big_endian
>
4222 Output_data_plt_aarch64
<size
, big_endian
>::add_local_ifunc_entry(
4223 Symbol_table
* symtab
,
4225 Sized_relobj_file
<size
, big_endian
>* relobj
,
4226 unsigned int local_sym_index
)
4228 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
4229 ++this->irelative_count_
;
4231 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
4233 // Every PLT entry needs a GOT entry which points back to the PLT
4235 this->got_irelative_
->set_current_data_size(got_offset
+ size
/ 8);
4237 // Every PLT entry needs a reloc.
4238 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4239 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
4240 elfcpp::R_AARCH64_IRELATIVE
,
4241 this->got_irelative_
, got_offset
, 0);
4246 // Add the relocation for a PLT entry.
4248 template<int size
, bool big_endian
>
4250 Output_data_plt_aarch64
<size
, big_endian
>::add_relocation(
4251 Symbol_table
* symtab
, Layout
* layout
, Symbol
* gsym
, unsigned int got_offset
)
4253 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4254 && gsym
->can_use_relative_reloc(false))
4256 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
4257 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_AARCH64_IRELATIVE
,
4258 this->got_irelative_
, got_offset
, 0);
4262 gsym
->set_needs_dynsym_entry();
4263 this->rel_
->add_global(gsym
, elfcpp::R_AARCH64_JUMP_SLOT
, this->got_plt_
,
4268 // Return where the TLSDESC relocations should go, creating it if
4269 // necessary. These follow the JUMP_SLOT relocations.
4271 template<int size
, bool big_endian
>
4272 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4273 Output_data_plt_aarch64
<size
, big_endian
>::rela_tlsdesc(Layout
* layout
)
4275 if (this->tlsdesc_rel_
== NULL
)
4277 this->tlsdesc_rel_
= new Reloc_section(false);
4278 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4279 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
4280 ORDER_DYNAMIC_PLT_RELOCS
, false);
4281 gold_assert(this->tlsdesc_rel_
->output_section()
4282 == this->rel_
->output_section());
4284 return this->tlsdesc_rel_
;
4287 // Return where the IRELATIVE relocations should go in the PLT. These
4288 // follow the JUMP_SLOT and the TLSDESC relocations.
4290 template<int size
, bool big_endian
>
4291 typename Output_data_plt_aarch64
<size
, big_endian
>::Reloc_section
*
4292 Output_data_plt_aarch64
<size
, big_endian
>::rela_irelative(Symbol_table
* symtab
,
4295 if (this->irelative_rel_
== NULL
)
4297 // Make sure we have a place for the TLSDESC relocations, in
4298 // case we see any later on.
4299 this->rela_tlsdesc(layout
);
4300 this->irelative_rel_
= new Reloc_section(false);
4301 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
4302 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
4303 ORDER_DYNAMIC_PLT_RELOCS
, false);
4304 gold_assert(this->irelative_rel_
->output_section()
4305 == this->rel_
->output_section());
4307 if (parameters
->doing_static_link())
4309 // A statically linked executable will only have a .rela.plt
4310 // section to hold R_AARCH64_IRELATIVE relocs for
4311 // STT_GNU_IFUNC symbols. The library will use these
4312 // symbols to locate the IRELATIVE relocs at program startup
4314 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
4315 Symbol_table::PREDEFINED
,
4316 this->irelative_rel_
, 0, 0,
4317 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4318 elfcpp::STV_HIDDEN
, 0, false, true);
4319 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
4320 Symbol_table::PREDEFINED
,
4321 this->irelative_rel_
, 0, 0,
4322 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
4323 elfcpp::STV_HIDDEN
, 0, true, true);
4326 return this->irelative_rel_
;
4329 // Return the PLT address to use for a global symbol.
4331 template<int size
, bool big_endian
>
4333 Output_data_plt_aarch64
<size
, big_endian
>::address_for_global(
4336 uint64_t offset
= 0;
4337 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
4338 && gsym
->can_use_relative_reloc(false))
4339 offset
= (this->first_plt_entry_offset() +
4340 this->count_
* this->get_plt_entry_size());
4341 return this->address() + offset
+ gsym
->plt_offset();
4344 // Return the PLT address to use for a local symbol. These are always
4345 // IRELATIVE relocs.
4347 template<int size
, bool big_endian
>
4349 Output_data_plt_aarch64
<size
, big_endian
>::address_for_local(
4350 const Relobj
* object
,
4353 return (this->address()
4354 + this->first_plt_entry_offset()
4355 + this->count_
* this->get_plt_entry_size()
4356 + object
->local_plt_offset(r_sym
));
4359 // Set the final size.
4361 template<int size
, bool big_endian
>
4363 Output_data_plt_aarch64
<size
, big_endian
>::set_final_data_size()
4365 unsigned int count
= this->count_
+ this->irelative_count_
;
4366 unsigned int extra_size
= 0;
4367 if (this->has_tlsdesc_entry())
4368 extra_size
+= this->get_plt_tlsdesc_entry_size();
4369 this->set_data_size(this->first_plt_entry_offset()
4370 + count
* this->get_plt_entry_size()
4374 template<int size
, bool big_endian
>
4375 class Output_data_plt_aarch64_standard
:
4376 public Output_data_plt_aarch64
<size
, big_endian
>
4379 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4380 Output_data_plt_aarch64_standard(
4382 Output_data_got_aarch64
<size
, big_endian
>* got
,
4383 Output_data_space
* got_plt
,
4384 Output_data_space
* got_irelative
)
4385 : Output_data_plt_aarch64
<size
, big_endian
>(layout
,
4392 // Return the offset of the first non-reserved PLT entry.
4393 virtual unsigned int
4394 do_first_plt_entry_offset() const
4395 { return this->first_plt_entry_size
; }
4397 // Return the size of a PLT entry
4398 virtual unsigned int
4399 do_get_plt_entry_size() const
4400 { return this->plt_entry_size
; }
4402 // Return the size of a tlsdesc entry
4403 virtual unsigned int
4404 do_get_plt_tlsdesc_entry_size() const
4405 { return this->plt_tlsdesc_entry_size
; }
4408 do_fill_first_plt_entry(unsigned char* pov
,
4409 Address got_address
,
4410 Address plt_address
);
4413 do_fill_plt_entry(unsigned char* pov
,
4414 Address got_address
,
4415 Address plt_address
,
4416 unsigned int got_offset
,
4417 unsigned int plt_offset
);
4420 do_fill_tlsdesc_entry(unsigned char* pov
,
4421 Address gotplt_address
,
4422 Address plt_address
,
4424 unsigned int tlsdesc_got_offset
,
4425 unsigned int plt_offset
);
4428 // The size of the first plt entry size.
4429 static const int first_plt_entry_size
= 32;
4430 // The size of the plt entry size.
4431 static const int plt_entry_size
= 16;
4432 // The size of the plt tlsdesc entry size.
4433 static const int plt_tlsdesc_entry_size
= 32;
4434 // Template for the first PLT entry.
4435 static const uint32_t first_plt_entry
[first_plt_entry_size
/ 4];
4436 // Template for subsequent PLT entries.
4437 static const uint32_t plt_entry
[plt_entry_size
/ 4];
4438 // The reserved TLSDESC entry in the PLT for an executable.
4439 static const uint32_t tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4];
4442 // The first entry in the PLT for an executable.
4446 Output_data_plt_aarch64_standard
<32, false>::
4447 first_plt_entry
[first_plt_entry_size
/ 4] =
4449 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4450 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4451 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4452 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4453 0xd61f0220, /* br x17 */
4454 0xd503201f, /* nop */
4455 0xd503201f, /* nop */
4456 0xd503201f, /* nop */
4462 Output_data_plt_aarch64_standard
<32, true>::
4463 first_plt_entry
[first_plt_entry_size
/ 4] =
4465 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4466 0x90000010, /* adrp x16, PLT_GOT+0x8 */
4467 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */
4468 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */
4469 0xd61f0220, /* br x17 */
4470 0xd503201f, /* nop */
4471 0xd503201f, /* nop */
4472 0xd503201f, /* nop */
4478 Output_data_plt_aarch64_standard
<64, false>::
4479 first_plt_entry
[first_plt_entry_size
/ 4] =
4481 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4482 0x90000010, /* adrp x16, PLT_GOT+16 */
4483 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4484 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4485 0xd61f0220, /* br x17 */
4486 0xd503201f, /* nop */
4487 0xd503201f, /* nop */
4488 0xd503201f, /* nop */
4494 Output_data_plt_aarch64_standard
<64, true>::
4495 first_plt_entry
[first_plt_entry_size
/ 4] =
4497 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */
4498 0x90000010, /* adrp x16, PLT_GOT+16 */
4499 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */
4500 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */
4501 0xd61f0220, /* br x17 */
4502 0xd503201f, /* nop */
4503 0xd503201f, /* nop */
4504 0xd503201f, /* nop */
4510 Output_data_plt_aarch64_standard
<32, false>::
4511 plt_entry
[plt_entry_size
/ 4] =
4513 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4514 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4515 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4516 0xd61f0220, /* br x17. */
4522 Output_data_plt_aarch64_standard
<32, true>::
4523 plt_entry
[plt_entry_size
/ 4] =
4525 0x90000010, /* adrp x16, PLTGOT + n * 4 */
4526 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */
4527 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */
4528 0xd61f0220, /* br x17. */
4534 Output_data_plt_aarch64_standard
<64, false>::
4535 plt_entry
[plt_entry_size
/ 4] =
4537 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4538 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4539 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4540 0xd61f0220, /* br x17. */
4546 Output_data_plt_aarch64_standard
<64, true>::
4547 plt_entry
[plt_entry_size
/ 4] =
4549 0x90000010, /* adrp x16, PLTGOT + n * 8 */
4550 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */
4551 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */
4552 0xd61f0220, /* br x17. */
4556 template<int size
, bool big_endian
>
4558 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_first_plt_entry(
4560 Address got_address
,
4561 Address plt_address
)
4563 // PLT0 of the small PLT looks like this in ELF64 -
4564 // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack.
4565 // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT
4566 // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the
4568 // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the
4569 // GOTPLT entry for this.
4571 // PLT0 will be slightly different in ELF32 due to different got entry
4573 memcpy(pov
, this->first_plt_entry
, this->first_plt_entry_size
);
4574 Address gotplt_2nd_ent
= got_address
+ (size
/ 8) * 2;
4576 // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2.
4577 // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff.
4578 // FIXME: This only works for 64bit
4579 AArch64_relocate_functions
<size
, big_endian
>::adrp(pov
+ 4,
4580 gotplt_2nd_ent
, plt_address
+ 4);
4582 // Fill in R_AARCH64_LDST8_LO12
4583 elfcpp::Swap
<32, big_endian
>::writeval(
4585 ((this->first_plt_entry
[2] & 0xffc003ff)
4586 | ((gotplt_2nd_ent
& 0xff8) << 7)));
4588 // Fill in R_AARCH64_ADD_ABS_LO12
4589 elfcpp::Swap
<32, big_endian
>::writeval(
4591 ((this->first_plt_entry
[3] & 0xffc003ff)
4592 | ((gotplt_2nd_ent
& 0xfff) << 10)));
4596 // Subsequent entries in the PLT for an executable.
4597 // FIXME: This only works for 64bit
4599 template<int size
, bool big_endian
>
4601 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_plt_entry(
4603 Address got_address
,
4604 Address plt_address
,
4605 unsigned int got_offset
,
4606 unsigned int plt_offset
)
4608 memcpy(pov
, this->plt_entry
, this->plt_entry_size
);
4610 Address gotplt_entry_address
= got_address
+ got_offset
;
4611 Address plt_entry_address
= plt_address
+ plt_offset
;
4613 // Fill in R_AARCH64_PCREL_ADR_HI21
4614 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4616 gotplt_entry_address
,
4619 // Fill in R_AARCH64_LDST64_ABS_LO12
4620 elfcpp::Swap
<32, big_endian
>::writeval(
4622 ((this->plt_entry
[1] & 0xffc003ff)
4623 | ((gotplt_entry_address
& 0xff8) << 7)));
4625 // Fill in R_AARCH64_ADD_ABS_LO12
4626 elfcpp::Swap
<32, big_endian
>::writeval(
4628 ((this->plt_entry
[2] & 0xffc003ff)
4629 | ((gotplt_entry_address
& 0xfff) <<10)));
4636 Output_data_plt_aarch64_standard
<32, false>::
4637 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4639 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4640 0x90000002, /* adrp x2, 0 */
4641 0x90000003, /* adrp x3, 0 */
4642 0xb9400042, /* ldr w2, [w2, #0] */
4643 0x11000063, /* add w3, w3, 0 */
4644 0xd61f0040, /* br x2 */
4645 0xd503201f, /* nop */
4646 0xd503201f, /* nop */
4651 Output_data_plt_aarch64_standard
<32, true>::
4652 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4654 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4655 0x90000002, /* adrp x2, 0 */
4656 0x90000003, /* adrp x3, 0 */
4657 0xb9400042, /* ldr w2, [w2, #0] */
4658 0x11000063, /* add w3, w3, 0 */
4659 0xd61f0040, /* br x2 */
4660 0xd503201f, /* nop */
4661 0xd503201f, /* nop */
4666 Output_data_plt_aarch64_standard
<64, false>::
4667 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4669 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4670 0x90000002, /* adrp x2, 0 */
4671 0x90000003, /* adrp x3, 0 */
4672 0xf9400042, /* ldr x2, [x2, #0] */
4673 0x91000063, /* add x3, x3, 0 */
4674 0xd61f0040, /* br x2 */
4675 0xd503201f, /* nop */
4676 0xd503201f, /* nop */
4681 Output_data_plt_aarch64_standard
<64, true>::
4682 tlsdesc_plt_entry
[plt_tlsdesc_entry_size
/ 4] =
4684 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */
4685 0x90000002, /* adrp x2, 0 */
4686 0x90000003, /* adrp x3, 0 */
4687 0xf9400042, /* ldr x2, [x2, #0] */
4688 0x91000063, /* add x3, x3, 0 */
4689 0xd61f0040, /* br x2 */
4690 0xd503201f, /* nop */
4691 0xd503201f, /* nop */
4694 template<int size
, bool big_endian
>
4696 Output_data_plt_aarch64_standard
<size
, big_endian
>::do_fill_tlsdesc_entry(
4698 Address gotplt_address
,
4699 Address plt_address
,
4701 unsigned int tlsdesc_got_offset
,
4702 unsigned int plt_offset
)
4704 memcpy(pov
, tlsdesc_plt_entry
, plt_tlsdesc_entry_size
);
4706 // move DT_TLSDESC_GOT address into x2
4707 // move .got.plt address into x3
4708 Address tlsdesc_got_entry
= got_base
+ tlsdesc_got_offset
;
4709 Address plt_entry_address
= plt_address
+ plt_offset
;
4711 // R_AARCH64_ADR_PREL_PG_HI21
4712 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4715 plt_entry_address
+ 4);
4717 // R_AARCH64_ADR_PREL_PG_HI21
4718 AArch64_relocate_functions
<size
, big_endian
>::adrp(
4721 plt_entry_address
+ 8);
4723 // R_AARCH64_LDST64_ABS_LO12
4724 elfcpp::Swap
<32, big_endian
>::writeval(
4726 ((this->tlsdesc_plt_entry
[3] & 0xffc003ff)
4727 | ((tlsdesc_got_entry
& 0xff8) << 7)));
4729 // R_AARCH64_ADD_ABS_LO12
4730 elfcpp::Swap
<32, big_endian
>::writeval(
4732 ((this->tlsdesc_plt_entry
[4] & 0xffc003ff)
4733 | ((gotplt_address
& 0xfff) << 10)));
4736 // Write out the PLT. This uses the hand-coded instructions above,
4737 // and adjusts them as needed. This is specified by the AMD64 ABI.
4739 template<int size
, bool big_endian
>
4741 Output_data_plt_aarch64
<size
, big_endian
>::do_write(Output_file
* of
)
4743 const off_t offset
= this->offset();
4744 const section_size_type oview_size
=
4745 convert_to_section_size_type(this->data_size());
4746 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
4748 const off_t got_file_offset
= this->got_plt_
->offset();
4749 gold_assert(got_file_offset
+ this->got_plt_
->data_size()
4750 == this->got_irelative_
->offset());
4752 const section_size_type got_size
=
4753 convert_to_section_size_type(this->got_plt_
->data_size()
4754 + this->got_irelative_
->data_size());
4755 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
4758 unsigned char* pov
= oview
;
4760 // The base address of the .plt section.
4761 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
4762 // The base address of the PLT portion of the .got section.
4763 typename
elfcpp::Elf_types
<size
>::Elf_Addr gotplt_address
4764 = this->got_plt_
->address();
4766 this->fill_first_plt_entry(pov
, gotplt_address
, plt_address
);
4767 pov
+= this->first_plt_entry_offset();
4769 // The first three entries in .got.plt are reserved.
4770 unsigned char* got_pov
= got_view
;
4771 memset(got_pov
, 0, size
/ 8 * AARCH64_GOTPLT_RESERVE_COUNT
);
4772 got_pov
+= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4774 unsigned int plt_offset
= this->first_plt_entry_offset();
4775 unsigned int got_offset
= (size
/ 8) * AARCH64_GOTPLT_RESERVE_COUNT
;
4776 const unsigned int count
= this->count_
+ this->irelative_count_
;
4777 for (unsigned int plt_index
= 0;
4780 pov
+= this->get_plt_entry_size(),
4781 got_pov
+= size
/ 8,
4782 plt_offset
+= this->get_plt_entry_size(),
4783 got_offset
+= size
/ 8)
4785 // Set and adjust the PLT entry itself.
4786 this->fill_plt_entry(pov
, gotplt_address
, plt_address
,
4787 got_offset
, plt_offset
);
4789 // Set the entry in the GOT, which points to plt0.
4790 elfcpp::Swap
<size
, big_endian
>::writeval(got_pov
, plt_address
);
4793 if (this->has_tlsdesc_entry())
4795 // Set and adjust the reserved TLSDESC PLT entry.
4796 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
4797 // The base address of the .base section.
4798 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
=
4799 this->got_
->address();
4800 this->fill_tlsdesc_entry(pov
, gotplt_address
, plt_address
, got_base
,
4801 tlsdesc_got_offset
, plt_offset
);
4802 pov
+= this->get_plt_tlsdesc_entry_size();
4805 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
4806 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
4808 of
->write_output_view(offset
, oview_size
, oview
);
4809 of
->write_output_view(got_file_offset
, got_size
, got_view
);
4812 // Telling how to update the immediate field of an instruction.
4813 struct AArch64_howto
4815 // The immediate field mask.
4816 elfcpp::Elf_Xword dst_mask
;
4818 // The offset to apply relocation immediate
4821 // The second part offset, if the immediate field has two parts.
4822 // -1 if the immediate field has only one part.
4826 static const AArch64_howto aarch64_howto
[AArch64_reloc_property::INST_NUM
] =
4828 {0, -1, -1}, // DATA
4829 {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16
4830 {0xffffe0, 5, -1}, // LD [23:5]-imm19
4831 {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi
4832 {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi
4833 {0x3ffc00, 10, -1}, // ADD [21:10]-imm12
4834 {0x3ffc00, 10, -1}, // LDST [21:10]-imm12
4835 {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14
4836 {0xffffe0, 5, -1}, // CONDB [23:5]-imm19
4837 {0x3ffffff, 0, -1}, // B [25:0]-imm26
4838 {0x3ffffff, 0, -1}, // CALL [25:0]-imm26
4841 // AArch64 relocate function class
4843 template<int size
, bool big_endian
>
4844 class AArch64_relocate_functions
4849 STATUS_OKAY
, // No error during relocation.
4850 STATUS_OVERFLOW
, // Relocation overflow.
4851 STATUS_BAD_RELOC
, // Relocation cannot be applied.
4854 typedef AArch64_relocate_functions
<size
, big_endian
> This
;
4855 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr Address
;
4856 typedef Relocate_info
<size
, big_endian
> The_relocate_info
;
4857 typedef AArch64_relobj
<size
, big_endian
> The_aarch64_relobj
;
4858 typedef Reloc_stub
<size
, big_endian
> The_reloc_stub
;
4859 typedef Stub_table
<size
, big_endian
> The_stub_table
;
4860 typedef elfcpp::Rela
<size
, big_endian
> The_rela
;
4861 typedef typename
elfcpp::Swap
<size
, big_endian
>::Valtype AArch64_valtype
;
4863 // Return the page address of the address.
4864 // Page(address) = address & ~0xFFF
4866 static inline AArch64_valtype
4867 Page(Address address
)
4869 return (address
& (~static_cast<Address
>(0xFFF)));
4873 // Update instruction (pointed by view) with selected bits (immed).
4874 // val = (val & ~dst_mask) | (immed << doffset)
4876 template<int valsize
>
4878 update_view(unsigned char* view
,
4879 AArch64_valtype immed
,
4880 elfcpp::Elf_Xword doffset
,
4881 elfcpp::Elf_Xword dst_mask
)
4883 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
4884 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
4885 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
4887 // Clear immediate fields.
4889 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
4890 static_cast<Valtype
>(val
| (immed
<< doffset
)));
4893 // Update two parts of an instruction (pointed by view) with selected
4894 // bits (immed1 and immed2).
4895 // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2)
4897 template<int valsize
>
4899 update_view_two_parts(
4900 unsigned char* view
,
4901 AArch64_valtype immed1
,
4902 AArch64_valtype immed2
,
4903 elfcpp::Elf_Xword doffset1
,
4904 elfcpp::Elf_Xword doffset2
,
4905 elfcpp::Elf_Xword dst_mask
)
4907 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
4908 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
4909 Valtype val
= elfcpp::Swap
<valsize
, big_endian
>::readval(wv
);
4911 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,
4912 static_cast<Valtype
>(val
| (immed1
<< doffset1
) |
4913 (immed2
<< doffset2
)));
4916 // Update adr or adrp instruction with immed.
4917 // In adr and adrp: [30:29] immlo [23:5] immhi
4920 update_adr(unsigned char* view
, AArch64_valtype immed
)
4922 elfcpp::Elf_Xword dst_mask
= (0x3 << 29) | (0x7ffff << 5);
4923 This::template update_view_two_parts
<32>(
4926 (immed
& 0x1ffffc) >> 2,
4932 // Update movz/movn instruction with bits immed.
4933 // Set instruction to movz if is_movz is true, otherwise set instruction
4937 update_movnz(unsigned char* view
,
4938 AArch64_valtype immed
,
4941 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Valtype
;
4942 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
4943 Valtype val
= elfcpp::Swap
<32, big_endian
>::readval(wv
);
4945 const elfcpp::Elf_Xword doffset
=
4946 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].doffset
;
4947 const elfcpp::Elf_Xword dst_mask
=
4948 aarch64_howto
[AArch64_reloc_property::INST_MOVW
].dst_mask
;
4950 // Clear immediate fields and opc code.
4951 val
&= ~(dst_mask
| (0x3 << 29));
4953 // Set instruction to movz or movn.
4954 // movz: [30:29] is 10 movn: [30:29] is 00
4958 elfcpp::Swap
<32, big_endian
>::writeval(wv
,
4959 static_cast<Valtype
>(val
| (immed
<< doffset
)));
4962 // Update selected bits in text.
4964 template<int valsize
>
4965 static inline typename
This::Status
4966 reloc_common(unsigned char* view
, Address x
,
4967 const AArch64_reloc_property
* reloc_property
)
4969 // Select bits from X.
4970 Address immed
= reloc_property
->select_x_value(x
);
4973 const AArch64_reloc_property::Reloc_inst inst
=
4974 reloc_property
->reloc_inst();
4975 // If it is a data relocation or instruction has 2 parts of immediate
4976 // fields, you should not call pcrela_general.
4977 gold_assert(aarch64_howto
[inst
].doffset2
== -1 &&
4978 aarch64_howto
[inst
].doffset
!= -1);
4979 This::template update_view
<valsize
>(view
, immed
,
4980 aarch64_howto
[inst
].doffset
,
4981 aarch64_howto
[inst
].dst_mask
);
4983 // Do check overflow or alignment if needed.
4984 return (reloc_property
->checkup_x_value(x
)
4986 : This::STATUS_OVERFLOW
);
4991 // Construct a B insn. Note, although we group it here with other relocation
4992 // operation, there is actually no 'relocation' involved here.
4994 construct_b(unsigned char* view
, unsigned int branch_offset
)
4996 update_view_two_parts
<32>(view
, 0x05, (branch_offset
>> 2),
5000 // Do a simple rela relocation at unaligned addresses.
5002 template<int valsize
>
5003 static inline typename
This::Status
5004 rela_ua(unsigned char* view
,
5005 const Sized_relobj_file
<size
, big_endian
>* object
,
5006 const Symbol_value
<size
>* psymval
,
5007 AArch64_valtype addend
,
5008 const AArch64_reloc_property
* reloc_property
)
5010 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5012 typename
elfcpp::Elf_types
<size
>::Elf_Addr x
=
5013 psymval
->value(object
, addend
);
5014 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5015 static_cast<Valtype
>(x
));
5016 return (reloc_property
->checkup_x_value(x
)
5018 : This::STATUS_OVERFLOW
);
5021 // Do a simple pc-relative relocation at unaligned addresses.
5023 template<int valsize
>
5024 static inline typename
This::Status
5025 pcrela_ua(unsigned char* view
,
5026 const Sized_relobj_file
<size
, big_endian
>* object
,
5027 const Symbol_value
<size
>* psymval
,
5028 AArch64_valtype addend
,
5030 const AArch64_reloc_property
* reloc_property
)
5032 typedef typename
elfcpp::Swap_unaligned
<valsize
, big_endian
>::Valtype
5034 Address x
= psymval
->value(object
, addend
) - address
;
5035 elfcpp::Swap_unaligned
<valsize
, big_endian
>::writeval(view
,
5036 static_cast<Valtype
>(x
));
5037 return (reloc_property
->checkup_x_value(x
)
5039 : This::STATUS_OVERFLOW
);
5042 // Do a simple rela relocation at aligned addresses.
5044 template<int valsize
>
5045 static inline typename
This::Status
5047 unsigned char* view
,
5048 const Sized_relobj_file
<size
, big_endian
>* object
,
5049 const Symbol_value
<size
>* psymval
,
5050 AArch64_valtype addend
,
5051 const AArch64_reloc_property
* reloc_property
)
5053 typedef typename
elfcpp::Swap
<valsize
, big_endian
>::Valtype Valtype
;
5054 Valtype
* wv
= reinterpret_cast<Valtype
*>(view
);
5055 Address x
= psymval
->value(object
, addend
);
5056 elfcpp::Swap
<valsize
, big_endian
>::writeval(wv
,static_cast<Valtype
>(x
));
5057 return (reloc_property
->checkup_x_value(x
)
5059 : This::STATUS_OVERFLOW
);
5062 // Do relocate. Update selected bits in text.
5063 // new_val = (val & ~dst_mask) | (immed << doffset)
5065 template<int valsize
>
5066 static inline typename
This::Status
5067 rela_general(unsigned char* view
,
5068 const Sized_relobj_file
<size
, big_endian
>* object
,
5069 const Symbol_value
<size
>* psymval
,
5070 AArch64_valtype addend
,
5071 const AArch64_reloc_property
* reloc_property
)
5073 // Calculate relocation.
5074 Address x
= psymval
->value(object
, addend
);
5075 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5078 // Do relocate. Update selected bits in text.
5079 // new val = (val & ~dst_mask) | (immed << doffset)
5081 template<int valsize
>
5082 static inline typename
This::Status
5084 unsigned char* view
,
5086 AArch64_valtype addend
,
5087 const AArch64_reloc_property
* reloc_property
)
5089 // Calculate relocation.
5090 Address x
= s
+ addend
;
5091 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5094 // Do address relative relocate. Update selected bits in text.
5095 // new val = (val & ~dst_mask) | (immed << doffset)
5097 template<int valsize
>
5098 static inline typename
This::Status
5100 unsigned char* view
,
5101 const Sized_relobj_file
<size
, big_endian
>* object
,
5102 const Symbol_value
<size
>* psymval
,
5103 AArch64_valtype addend
,
5105 const AArch64_reloc_property
* reloc_property
)
5107 // Calculate relocation.
5108 Address x
= psymval
->value(object
, addend
) - address
;
5109 return This::template reloc_common
<valsize
>(view
, x
, reloc_property
);
5113 // Calculate (S + A) - address, update adr instruction.
5115 static inline typename
This::Status
5116 adr(unsigned char* view
,
5117 const Sized_relobj_file
<size
, big_endian
>* object
,
5118 const Symbol_value
<size
>* psymval
,
5121 const AArch64_reloc_property
* /* reloc_property */)
5123 AArch64_valtype x
= psymval
->value(object
, addend
) - address
;
5124 // Pick bits [20:0] of X.
5125 AArch64_valtype immed
= x
& 0x1fffff;
5126 update_adr(view
, immed
);
5127 // Check -2^20 <= X < 2^20
5128 return (size
== 64 && Bits
<21>::has_overflow((x
))
5129 ? This::STATUS_OVERFLOW
5130 : This::STATUS_OKAY
);
5133 // Calculate PG(S+A) - PG(address), update adrp instruction.
5134 // R_AARCH64_ADR_PREL_PG_HI21
5136 static inline typename
This::Status
5138 unsigned char* view
,
5142 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5143 // Pick [32:12] of X.
5144 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5145 update_adr(view
, immed
);
5146 // Check -2^32 <= X < 2^32
5147 return (size
== 64 && Bits
<33>::has_overflow((x
))
5148 ? This::STATUS_OVERFLOW
5149 : This::STATUS_OKAY
);
5152 // Calculate PG(S+A) - PG(address), update adrp instruction.
5153 // R_AARCH64_ADR_PREL_PG_HI21
5155 static inline typename
This::Status
5156 adrp(unsigned char* view
,
5157 const Sized_relobj_file
<size
, big_endian
>* object
,
5158 const Symbol_value
<size
>* psymval
,
5161 const AArch64_reloc_property
* reloc_property
)
5163 Address sa
= psymval
->value(object
, addend
);
5164 AArch64_valtype x
= This::Page(sa
) - This::Page(address
);
5165 // Pick [32:12] of X.
5166 AArch64_valtype immed
= (x
>> 12) & 0x1fffff;
5167 update_adr(view
, immed
);
5168 return (reloc_property
->checkup_x_value(x
)
5170 : This::STATUS_OVERFLOW
);
5173 // Update mov[n/z] instruction. Check overflow if needed.
5174 // If X >=0, set the instruction to movz and its immediate value to the
5176 // If X < 0, set the instruction to movn and its immediate value to
5177 // NOT (selected bits of).
5179 static inline typename
This::Status
5180 movnz(unsigned char* view
,
5182 const AArch64_reloc_property
* reloc_property
)
5184 // Select bits from X.
5187 typedef typename
elfcpp::Elf_types
<size
>::Elf_Swxword SignedW
;
5188 if (static_cast<SignedW
>(x
) >= 0)
5190 immed
= reloc_property
->select_x_value(x
);
5195 immed
= reloc_property
->select_x_value(~x
);;
5199 // Update movnz instruction.
5200 update_movnz(view
, immed
, is_movz
);
5202 // Do check overflow or alignment if needed.
5203 return (reloc_property
->checkup_x_value(x
)
5205 : This::STATUS_OVERFLOW
);
5209 maybe_apply_stub(unsigned int,
5210 const The_relocate_info
*,
5214 const Sized_symbol
<size
>*,
5215 const Symbol_value
<size
>*,
5216 const Sized_relobj_file
<size
, big_endian
>*,
5219 }; // End of AArch64_relocate_functions
5222 // For a certain relocation type (usually jump/branch), test to see if the
5223 // destination needs a stub to fulfil. If so, re-route the destination of the
5224 // original instruction to the stub, note, at this time, the stub has already
5227 template<int size
, bool big_endian
>
5229 AArch64_relocate_functions
<size
, big_endian
>::
5230 maybe_apply_stub(unsigned int r_type
,
5231 const The_relocate_info
* relinfo
,
5232 const The_rela
& rela
,
5233 unsigned char* view
,
5235 const Sized_symbol
<size
>* gsym
,
5236 const Symbol_value
<size
>* psymval
,
5237 const Sized_relobj_file
<size
, big_endian
>* object
,
5238 section_size_type current_group_size
)
5240 if (parameters
->options().relocatable())
5243 typename
elfcpp::Elf_types
<size
>::Elf_Swxword addend
= rela
.get_r_addend();
5244 Address branch_target
= psymval
->value(object
, 0) + addend
;
5246 The_reloc_stub::stub_type_for_reloc(r_type
, address
, branch_target
);
5247 if (stub_type
== ST_NONE
)
5250 const The_aarch64_relobj
* aarch64_relobj
=
5251 static_cast<const The_aarch64_relobj
*>(object
);
5252 The_stub_table
* stub_table
= aarch64_relobj
->stub_table(relinfo
->data_shndx
);
5253 gold_assert(stub_table
!= NULL
);
5255 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5256 typename
The_reloc_stub::Key
stub_key(stub_type
, gsym
, object
, r_sym
, addend
);
5257 The_reloc_stub
* stub
= stub_table
->find_reloc_stub(stub_key
);
5258 gold_assert(stub
!= NULL
);
5260 Address new_branch_target
= stub_table
->address() + stub
->offset();
5261 typename
elfcpp::Swap
<size
, big_endian
>::Valtype branch_offset
=
5262 new_branch_target
- address
;
5263 const AArch64_reloc_property
* arp
=
5264 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5265 gold_assert(arp
!= NULL
);
5266 typename
This::Status status
= This::template
5267 rela_general
<32>(view
, branch_offset
, 0, arp
);
5268 if (status
!= This::STATUS_OKAY
)
5269 gold_error(_("Stub is too far away, try a smaller value "
5270 "for '--stub-group-size'. The current value is 0x%lx."),
5271 static_cast<unsigned long>(current_group_size
));
5276 // Group input sections for stub generation.
5278 // We group input sections in an output section so that the total size,
5279 // including any padding space due to alignment is smaller than GROUP_SIZE
5280 // unless the only input section in group is bigger than GROUP_SIZE already.
5281 // Then an ARM stub table is created to follow the last input section
5282 // in group. For each group an ARM stub table is created an is placed
5283 // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further
5284 // extend the group after the stub table.
5286 template<int size
, bool big_endian
>
5288 Target_aarch64
<size
, big_endian
>::group_sections(
5290 section_size_type group_size
,
5291 bool stubs_always_after_branch
,
5294 // Group input sections and insert stub table
5295 Layout::Section_list section_list
;
5296 layout
->get_executable_sections(§ion_list
);
5297 for (Layout::Section_list::const_iterator p
= section_list
.begin();
5298 p
!= section_list
.end();
5301 AArch64_output_section
<size
, big_endian
>* output_section
=
5302 static_cast<AArch64_output_section
<size
, big_endian
>*>(*p
);
5303 output_section
->group_sections(group_size
, stubs_always_after_branch
,
5309 // Find the AArch64_input_section object corresponding to the SHNDX-th input
5310 // section of RELOBJ.
5312 template<int size
, bool big_endian
>
5313 AArch64_input_section
<size
, big_endian
>*
5314 Target_aarch64
<size
, big_endian
>::find_aarch64_input_section(
5315 Relobj
* relobj
, unsigned int shndx
) const
5317 Section_id
sid(relobj
, shndx
);
5318 typename
AArch64_input_section_map::const_iterator p
=
5319 this->aarch64_input_section_map_
.find(sid
);
5320 return (p
!= this->aarch64_input_section_map_
.end()) ? p
->second
: NULL
;
5324 // Make a new AArch64_input_section object.
5326 template<int size
, bool big_endian
>
5327 AArch64_input_section
<size
, big_endian
>*
5328 Target_aarch64
<size
, big_endian
>::new_aarch64_input_section(
5329 Relobj
* relobj
, unsigned int shndx
)
5331 Section_id
sid(relobj
, shndx
);
5333 AArch64_input_section
<size
, big_endian
>* input_section
=
5334 new AArch64_input_section
<size
, big_endian
>(relobj
, shndx
);
5335 input_section
->init();
5337 // Register new AArch64_input_section in map for look-up.
5338 std::pair
<typename
AArch64_input_section_map::iterator
,bool> ins
=
5339 this->aarch64_input_section_map_
.insert(
5340 std::make_pair(sid
, input_section
));
5342 // Make sure that it we have not created another AArch64_input_section
5343 // for this input section already.
5344 gold_assert(ins
.second
);
5346 return input_section
;
5350 // Relaxation hook. This is where we do stub generation.
5352 template<int size
, bool big_endian
>
5354 Target_aarch64
<size
, big_endian
>::do_relax(
5356 const Input_objects
* input_objects
,
5357 Symbol_table
* symtab
,
5361 gold_assert(!parameters
->options().relocatable());
5364 // We don't handle negative stub_group_size right now.
5365 this->stub_group_size_
= abs(parameters
->options().stub_group_size());
5366 if (this->stub_group_size_
== 1)
5368 // Leave room for 4096 4-byte stub entries. If we exceed that, then we
5369 // will fail to link. The user will have to relink with an explicit
5370 // group size option.
5371 this->stub_group_size_
= The_reloc_stub::MAX_BRANCH_OFFSET
-
5374 group_sections(layout
, this->stub_group_size_
, true, task
);
5378 // If this is not the first pass, addresses and file offsets have
5379 // been reset at this point, set them here.
5380 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5381 sp
!= this->stub_tables_
.end(); ++sp
)
5383 The_stub_table
* stt
= *sp
;
5384 The_aarch64_input_section
* owner
= stt
->owner();
5385 off_t off
= align_address(owner
->original_size(),
5387 stt
->set_address_and_file_offset(owner
->address() + off
,
5388 owner
->offset() + off
);
5392 // Scan relocs for relocation stubs
5393 for (Input_objects::Relobj_iterator op
= input_objects
->relobj_begin();
5394 op
!= input_objects
->relobj_end();
5397 The_aarch64_relobj
* aarch64_relobj
=
5398 static_cast<The_aarch64_relobj
*>(*op
);
5399 // Lock the object so we can read from it. This is only called
5400 // single-threaded from Layout::finalize, so it is OK to lock.
5401 Task_lock_obj
<Object
> tl(task
, aarch64_relobj
);
5402 aarch64_relobj
->scan_sections_for_stubs(this, symtab
, layout
);
5405 bool any_stub_table_changed
= false;
5406 for (Stub_table_iterator siter
= this->stub_tables_
.begin();
5407 siter
!= this->stub_tables_
.end() && !any_stub_table_changed
; ++siter
)
5409 The_stub_table
* stub_table
= *siter
;
5410 if (stub_table
->update_data_size_changed_p())
5412 The_aarch64_input_section
* owner
= stub_table
->owner();
5413 uint64_t address
= owner
->address();
5414 off_t offset
= owner
->offset();
5415 owner
->reset_address_and_file_offset();
5416 owner
->set_address_and_file_offset(address
, offset
);
5418 any_stub_table_changed
= true;
5422 // Do not continue relaxation.
5423 bool continue_relaxation
= any_stub_table_changed
;
5424 if (!continue_relaxation
)
5425 for (Stub_table_iterator sp
= this->stub_tables_
.begin();
5426 (sp
!= this->stub_tables_
.end());
5428 (*sp
)->finalize_stubs();
5430 return continue_relaxation
;
5434 // Make a new Stub_table.
5436 template<int size
, bool big_endian
>
5437 Stub_table
<size
, big_endian
>*
5438 Target_aarch64
<size
, big_endian
>::new_stub_table(
5439 AArch64_input_section
<size
, big_endian
>* owner
)
5441 Stub_table
<size
, big_endian
>* stub_table
=
5442 new Stub_table
<size
, big_endian
>(owner
);
5443 stub_table
->set_address(align_address(
5444 owner
->address() + owner
->data_size(), 8));
5445 stub_table
->set_file_offset(owner
->offset() + owner
->data_size());
5446 stub_table
->finalize_data_size();
5448 this->stub_tables_
.push_back(stub_table
);
5454 template<int size
, bool big_endian
>
5456 Target_aarch64
<size
, big_endian
>::do_reloc_addend(
5457 void* arg
, unsigned int r_type
, uint64_t) const
5459 gold_assert(r_type
== elfcpp::R_AARCH64_TLSDESC
);
5460 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
5461 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
5462 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
5463 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
5464 gold_assert(psymval
->is_tls_symbol());
5465 // The value of a TLS symbol is the offset in the TLS segment.
5466 return psymval
->value(ti
.object
, 0);
5469 // Return the number of entries in the PLT.
5471 template<int size
, bool big_endian
>
5473 Target_aarch64
<size
, big_endian
>::plt_entry_count() const
5475 if (this->plt_
== NULL
)
5477 return this->plt_
->entry_count();
5480 // Return the offset of the first non-reserved PLT entry.
5482 template<int size
, bool big_endian
>
5484 Target_aarch64
<size
, big_endian
>::first_plt_entry_offset() const
5486 return this->plt_
->first_plt_entry_offset();
5489 // Return the size of each PLT entry.
5491 template<int size
, bool big_endian
>
5493 Target_aarch64
<size
, big_endian
>::plt_entry_size() const
5495 return this->plt_
->get_plt_entry_size();
5498 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
5500 template<int size
, bool big_endian
>
5502 Target_aarch64
<size
, big_endian
>::define_tls_base_symbol(
5503 Symbol_table
* symtab
, Layout
* layout
)
5505 if (this->tls_base_symbol_defined_
)
5508 Output_segment
* tls_segment
= layout
->tls_segment();
5509 if (tls_segment
!= NULL
)
5511 // _TLS_MODULE_BASE_ always points to the beginning of tls segment.
5512 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
5513 Symbol_table::PREDEFINED
,
5517 elfcpp::STV_HIDDEN
, 0,
5518 Symbol::SEGMENT_START
,
5521 this->tls_base_symbol_defined_
= true;
5524 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
5526 template<int size
, bool big_endian
>
5528 Target_aarch64
<size
, big_endian
>::reserve_tlsdesc_entries(
5529 Symbol_table
* symtab
, Layout
* layout
)
5531 if (this->plt_
== NULL
)
5532 this->make_plt_section(symtab
, layout
);
5534 if (!this->plt_
->has_tlsdesc_entry())
5536 // Allocate the TLSDESC_GOT entry.
5537 Output_data_got_aarch64
<size
, big_endian
>* got
=
5538 this->got_section(symtab
, layout
);
5539 unsigned int got_offset
= got
->add_constant(0);
5541 // Allocate the TLSDESC_PLT entry.
5542 this->plt_
->reserve_tlsdesc_entry(got_offset
);
5546 // Create a GOT entry for the TLS module index.
5548 template<int size
, bool big_endian
>
5550 Target_aarch64
<size
, big_endian
>::got_mod_index_entry(
5551 Symbol_table
* symtab
, Layout
* layout
,
5552 Sized_relobj_file
<size
, big_endian
>* object
)
5554 if (this->got_mod_index_offset_
== -1U)
5556 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
5557 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
5558 Output_data_got_aarch64
<size
, big_endian
>* got
=
5559 this->got_section(symtab
, layout
);
5560 unsigned int got_offset
= got
->add_constant(0);
5561 rela_dyn
->add_local(object
, 0, elfcpp::R_AARCH64_TLS_DTPMOD64
, got
,
5563 got
->add_constant(0);
5564 this->got_mod_index_offset_
= got_offset
;
5566 return this->got_mod_index_offset_
;
5569 // Optimize the TLS relocation type based on what we know about the
5570 // symbol. IS_FINAL is true if the final address of this symbol is
5571 // known at link time.
5573 template<int size
, bool big_endian
>
5574 tls::Tls_optimization
5575 Target_aarch64
<size
, big_endian
>::optimize_tls_reloc(bool is_final
,
5578 // If we are generating a shared library, then we can't do anything
5580 if (parameters
->options().shared())
5581 return tls::TLSOPT_NONE
;
5585 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5586 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5587 case elfcpp::R_AARCH64_TLSDESC_LD_PREL19
:
5588 case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21
:
5589 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5590 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5591 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5592 case elfcpp::R_AARCH64_TLSDESC_OFF_G1
:
5593 case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC
:
5594 case elfcpp::R_AARCH64_TLSDESC_LDR
:
5595 case elfcpp::R_AARCH64_TLSDESC_ADD
:
5596 case elfcpp::R_AARCH64_TLSDESC_CALL
:
5597 // These are General-Dynamic which permits fully general TLS
5598 // access. Since we know that we are generating an executable,
5599 // we can convert this to Initial-Exec. If we also know that
5600 // this is a local symbol, we can further switch to Local-Exec.
5602 return tls::TLSOPT_TO_LE
;
5603 return tls::TLSOPT_TO_IE
;
5605 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5606 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5607 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5608 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5609 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5610 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5611 // These are Local-Dynamic, which refer to local symbols in the
5612 // dynamic TLS block. Since we know that we generating an
5613 // executable, we can switch to Local-Exec.
5614 return tls::TLSOPT_TO_LE
;
5616 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1
:
5617 case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC
:
5618 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5619 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5620 case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19
:
5621 // These are Initial-Exec relocs which get the thread offset
5622 // from the GOT. If we know that we are linking against the
5623 // local symbol, we can switch to Local-Exec, which links the
5624 // thread offset into the instruction.
5626 return tls::TLSOPT_TO_LE
;
5627 return tls::TLSOPT_NONE
;
5629 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5630 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5631 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5632 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5633 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5634 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5635 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5636 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5637 // When we already have Local-Exec, there is nothing further we
5639 return tls::TLSOPT_NONE
;
5646 // Returns true if this relocation type could be that of a function pointer.
5648 template<int size
, bool big_endian
>
5650 Target_aarch64
<size
, big_endian
>::Scan::possible_function_pointer_reloc(
5651 unsigned int r_type
)
5655 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
5656 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
5657 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
5658 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
5659 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
5667 // For safe ICF, scan a relocation for a local symbol to check if it
5668 // corresponds to a function pointer being taken. In that case mark
5669 // the function whose pointer was taken as not foldable.
5671 template<int size
, bool big_endian
>
5673 Target_aarch64
<size
, big_endian
>::Scan::local_reloc_may_be_function_pointer(
5676 Target_aarch64
<size
, big_endian
>* ,
5677 Sized_relobj_file
<size
, big_endian
>* ,
5680 const elfcpp::Rela
<size
, big_endian
>& ,
5681 unsigned int r_type
,
5682 const elfcpp::Sym
<size
, big_endian
>&)
5684 // When building a shared library, do not fold any local symbols.
5685 return (parameters
->options().shared()
5686 || possible_function_pointer_reloc(r_type
));
5689 // For safe ICF, scan a relocation for a global symbol to check if it
5690 // corresponds to a function pointer being taken. In that case mark
5691 // the function whose pointer was taken as not foldable.
5693 template<int size
, bool big_endian
>
5695 Target_aarch64
<size
, big_endian
>::Scan::global_reloc_may_be_function_pointer(
5698 Target_aarch64
<size
, big_endian
>* ,
5699 Sized_relobj_file
<size
, big_endian
>* ,
5702 const elfcpp::Rela
<size
, big_endian
>& ,
5703 unsigned int r_type
,
5706 // When building a shared library, do not fold symbols whose visibility
5707 // is hidden, internal or protected.
5708 return ((parameters
->options().shared()
5709 && (gsym
->visibility() == elfcpp::STV_INTERNAL
5710 || gsym
->visibility() == elfcpp::STV_PROTECTED
5711 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
5712 || possible_function_pointer_reloc(r_type
));
5715 // Report an unsupported relocation against a local symbol.
5717 template<int size
, bool big_endian
>
5719 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_local(
5720 Sized_relobj_file
<size
, big_endian
>* object
,
5721 unsigned int r_type
)
5723 gold_error(_("%s: unsupported reloc %u against local symbol"),
5724 object
->name().c_str(), r_type
);
5727 // We are about to emit a dynamic relocation of type R_TYPE. If the
5728 // dynamic linker does not support it, issue an error.
5730 template<int size
, bool big_endian
>
5732 Target_aarch64
<size
, big_endian
>::Scan::check_non_pic(Relobj
* object
,
5733 unsigned int r_type
)
5735 gold_assert(r_type
!= elfcpp::R_AARCH64_NONE
);
5739 // These are the relocation types supported by glibc for AARCH64.
5740 case elfcpp::R_AARCH64_NONE
:
5741 case elfcpp::R_AARCH64_COPY
:
5742 case elfcpp::R_AARCH64_GLOB_DAT
:
5743 case elfcpp::R_AARCH64_JUMP_SLOT
:
5744 case elfcpp::R_AARCH64_RELATIVE
:
5745 case elfcpp::R_AARCH64_TLS_DTPREL64
:
5746 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
5747 case elfcpp::R_AARCH64_TLS_TPREL64
:
5748 case elfcpp::R_AARCH64_TLSDESC
:
5749 case elfcpp::R_AARCH64_IRELATIVE
:
5750 case elfcpp::R_AARCH64_ABS32
:
5751 case elfcpp::R_AARCH64_ABS64
:
5758 // This prevents us from issuing more than one error per reloc
5759 // section. But we can still wind up issuing more than one
5760 // error per object file.
5761 if (this->issued_non_pic_error_
)
5763 gold_assert(parameters
->options().output_is_position_independent());
5764 object
->error(_("requires unsupported dynamic reloc; "
5765 "recompile with -fPIC"));
5766 this->issued_non_pic_error_
= true;
5770 // Return whether we need to make a PLT entry for a relocation of the
5771 // given type against a STT_GNU_IFUNC symbol.
5773 template<int size
, bool big_endian
>
5775 Target_aarch64
<size
, big_endian
>::Scan::reloc_needs_plt_for_ifunc(
5776 Sized_relobj_file
<size
, big_endian
>* object
,
5777 unsigned int r_type
)
5779 const AArch64_reloc_property
* arp
=
5780 aarch64_reloc_property_table
->get_reloc_property(r_type
);
5781 gold_assert(arp
!= NULL
);
5783 int flags
= arp
->reference_flags();
5784 if (flags
& Symbol::TLS_REF
)
5786 gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"),
5787 object
->name().c_str(), arp
->name().c_str());
5793 // Scan a relocation for a local symbol.
5795 template<int size
, bool big_endian
>
5797 Target_aarch64
<size
, big_endian
>::Scan::local(
5798 Symbol_table
* symtab
,
5800 Target_aarch64
<size
, big_endian
>* target
,
5801 Sized_relobj_file
<size
, big_endian
>* object
,
5802 unsigned int data_shndx
,
5803 Output_section
* output_section
,
5804 const elfcpp::Rela
<size
, big_endian
>& rela
,
5805 unsigned int r_type
,
5806 const elfcpp::Sym
<size
, big_endian
>& lsym
,
5812 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
5814 Output_data_got_aarch64
<size
, big_endian
>* got
=
5815 target
->got_section(symtab
, layout
);
5816 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5818 // A local STT_GNU_IFUNC symbol may require a PLT entry.
5819 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
5820 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
5821 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
5825 case elfcpp::R_AARCH64_ABS32
:
5826 case elfcpp::R_AARCH64_ABS16
:
5827 if (parameters
->options().output_is_position_independent())
5829 gold_error(_("%s: unsupported reloc %u in pos independent link."),
5830 object
->name().c_str(), r_type
);
5834 case elfcpp::R_AARCH64_ABS64
:
5835 // If building a shared library or pie, we need to mark this as a dynmic
5836 // reloction, so that the dynamic loader can relocate it.
5837 if (parameters
->options().output_is_position_independent())
5839 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
5840 rela_dyn
->add_local_relative(object
, r_sym
,
5841 elfcpp::R_AARCH64_RELATIVE
,
5844 rela
.get_r_offset(),
5845 rela
.get_r_addend(),
5850 case elfcpp::R_AARCH64_PREL64
:
5851 case elfcpp::R_AARCH64_PREL32
:
5852 case elfcpp::R_AARCH64_PREL16
:
5855 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
5856 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
5857 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
5858 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
5859 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
5860 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
5861 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
5862 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
5863 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
5864 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
5867 // Control flow, pc-relative. We don't need to do anything for a relative
5868 // addressing relocation against a local symbol if it does not reference
5870 case elfcpp::R_AARCH64_TSTBR14
:
5871 case elfcpp::R_AARCH64_CONDBR19
:
5872 case elfcpp::R_AARCH64_JUMP26
:
5873 case elfcpp::R_AARCH64_CALL26
:
5876 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
5877 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
5879 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5880 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5881 if (tlsopt
== tls::TLSOPT_TO_LE
)
5884 layout
->set_has_static_tls();
5885 // Create a GOT entry for the tp-relative offset.
5886 if (!parameters
->doing_static_link())
5888 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
5889 target
->rela_dyn_section(layout
),
5890 elfcpp::R_AARCH64_TLS_TPREL64
);
5892 else if (!object
->local_has_got_offset(r_sym
,
5893 GOT_TYPE_TLS_OFFSET
))
5895 got
->add_local(object
, r_sym
, GOT_TYPE_TLS_OFFSET
);
5896 unsigned int got_offset
=
5897 object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
);
5898 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
5899 gold_assert(addend
== 0);
5900 got
->add_static_reloc(got_offset
, elfcpp::R_AARCH64_TLS_TPREL64
,
5906 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
5907 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
5909 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5910 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5911 if (tlsopt
== tls::TLSOPT_TO_LE
)
5913 layout
->set_has_static_tls();
5916 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
5918 got
->add_local_pair_with_rel(object
,r_sym
, data_shndx
,
5920 target
->rela_dyn_section(layout
),
5921 elfcpp::R_AARCH64_TLS_DTPMOD64
);
5925 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
5926 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
5927 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
5928 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
5929 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
5930 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
5931 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
5932 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
5934 layout
->set_has_static_tls();
5935 bool output_is_shared
= parameters
->options().shared();
5936 if (output_is_shared
)
5937 gold_error(_("%s: unsupported TLSLE reloc %u in shared code."),
5938 object
->name().c_str(), r_type
);
5942 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
5943 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
5945 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5946 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5947 if (tlsopt
== tls::TLSOPT_NONE
)
5949 // Create a GOT entry for the module index.
5950 target
->got_mod_index_entry(symtab
, layout
, object
);
5952 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
5953 unsupported_reloc_local(object
, r_type
);
5957 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
5958 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
5959 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
5960 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
5963 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
5964 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
5965 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
5967 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
5968 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
5969 target
->define_tls_base_symbol(symtab
, layout
);
5970 if (tlsopt
== tls::TLSOPT_NONE
)
5972 // Create reserved PLT and GOT entries for the resolver.
5973 target
->reserve_tlsdesc_entries(symtab
, layout
);
5975 // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc.
5976 // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT
5977 // entry needs to be in an area in .got.plt, not .got. Call
5978 // got_section to make sure the section has been created.
5979 target
->got_section(symtab
, layout
);
5980 Output_data_got
<size
, big_endian
>* got
=
5981 target
->got_tlsdesc_section();
5982 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
5983 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
5985 unsigned int got_offset
= got
->add_constant(0);
5986 got
->add_constant(0);
5987 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
5989 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
5990 // We store the arguments we need in a vector, and use
5991 // the index into the vector as the parameter to pass
5992 // to the target specific routines.
5993 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
5994 void* arg
= reinterpret_cast<void*>(intarg
);
5995 rt
->add_target_specific(elfcpp::R_AARCH64_TLSDESC
, arg
,
5996 got
, got_offset
, 0);
5999 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6000 unsupported_reloc_local(object
, r_type
);
6004 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6008 unsupported_reloc_local(object
, r_type
);
6013 // Report an unsupported relocation against a global symbol.
6015 template<int size
, bool big_endian
>
6017 Target_aarch64
<size
, big_endian
>::Scan::unsupported_reloc_global(
6018 Sized_relobj_file
<size
, big_endian
>* object
,
6019 unsigned int r_type
,
6022 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
6023 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
6026 template<int size
, bool big_endian
>
6028 Target_aarch64
<size
, big_endian
>::Scan::global(
6029 Symbol_table
* symtab
,
6031 Target_aarch64
<size
, big_endian
>* target
,
6032 Sized_relobj_file
<size
, big_endian
> * object
,
6033 unsigned int data_shndx
,
6034 Output_section
* output_section
,
6035 const elfcpp::Rela
<size
, big_endian
>& rela
,
6036 unsigned int r_type
,
6039 // A STT_GNU_IFUNC symbol may require a PLT entry.
6040 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
6041 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
6042 target
->make_plt_entry(symtab
, layout
, gsym
);
6044 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>
6046 const AArch64_reloc_property
* arp
=
6047 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6048 gold_assert(arp
!= NULL
);
6052 case elfcpp::R_AARCH64_ABS16
:
6053 case elfcpp::R_AARCH64_ABS32
:
6054 case elfcpp::R_AARCH64_ABS64
:
6056 // Make a PLT entry if necessary.
6057 if (gsym
->needs_plt_entry())
6059 target
->make_plt_entry(symtab
, layout
, gsym
);
6060 // Since this is not a PC-relative relocation, we may be
6061 // taking the address of a function. In that case we need to
6062 // set the entry in the dynamic symbol table to the address of
6064 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
6065 gsym
->set_needs_dynsym_value();
6067 // Make a dynamic relocation if necessary.
6068 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6070 if (!parameters
->options().output_is_position_independent()
6071 && gsym
->may_need_copy_reloc())
6073 target
->copy_reloc(symtab
, layout
, object
,
6074 data_shndx
, output_section
, gsym
, rela
);
6076 else if (r_type
== elfcpp::R_AARCH64_ABS64
6077 && gsym
->type() == elfcpp::STT_GNU_IFUNC
6078 && gsym
->can_use_relative_reloc(false)
6079 && !gsym
->is_from_dynobj()
6080 && !gsym
->is_undefined()
6081 && !gsym
->is_preemptible())
6083 // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC
6084 // symbol. This makes a function address in a PIE executable
6085 // match the address in a shared library that it links against.
6086 Reloc_section
* rela_dyn
=
6087 target
->rela_irelative_section(layout
);
6088 unsigned int r_type
= elfcpp::R_AARCH64_IRELATIVE
;
6089 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
6090 output_section
, object
,
6092 rela
.get_r_offset(),
6093 rela
.get_r_addend());
6095 else if (r_type
== elfcpp::R_AARCH64_ABS64
6096 && gsym
->can_use_relative_reloc(false))
6098 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6099 rela_dyn
->add_global_relative(gsym
,
6100 elfcpp::R_AARCH64_RELATIVE
,
6104 rela
.get_r_offset(),
6105 rela
.get_r_addend(),
6110 check_non_pic(object
, r_type
);
6111 Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, big_endian
>*
6112 rela_dyn
= target
->rela_dyn_section(layout
);
6113 rela_dyn
->add_global(
6114 gsym
, r_type
, output_section
, object
,
6115 data_shndx
, rela
.get_r_offset(),rela
.get_r_addend());
6121 case elfcpp::R_AARCH64_PREL16
:
6122 case elfcpp::R_AARCH64_PREL32
:
6123 case elfcpp::R_AARCH64_PREL64
:
6124 // This is used to fill the GOT absolute address.
6125 if (gsym
->needs_plt_entry())
6127 target
->make_plt_entry(symtab
, layout
, gsym
);
6131 case elfcpp::R_AARCH64_LD_PREL_LO19
: // 273
6132 case elfcpp::R_AARCH64_ADR_PREL_LO21
: // 274
6133 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
: // 275
6134 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
: // 276
6135 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
: // 277
6136 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
: // 278
6137 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
: // 284
6138 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
: // 285
6139 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
: // 286
6140 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
: // 299
6142 if (gsym
->needs_plt_entry())
6143 target
->make_plt_entry(symtab
, layout
, gsym
);
6144 // Make a dynamic relocation if necessary.
6145 if (gsym
->needs_dynamic_reloc(arp
->reference_flags()))
6147 if (parameters
->options().output_is_executable()
6148 && gsym
->may_need_copy_reloc())
6150 target
->copy_reloc(symtab
, layout
, object
,
6151 data_shndx
, output_section
, gsym
, rela
);
6157 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6158 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6160 // This pair of relocations is used to access a specific GOT entry.
6161 // Note a GOT entry is an *address* to a symbol.
6162 // The symbol requires a GOT entry
6163 Output_data_got_aarch64
<size
, big_endian
>* got
=
6164 target
->got_section(symtab
, layout
);
6165 if (gsym
->final_value_is_known())
6167 // For a STT_GNU_IFUNC symbol we want the PLT address.
6168 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
6169 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6171 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6175 // If this symbol is not fully resolved, we need to add a dynamic
6176 // relocation for it.
6177 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
6179 // Use a GLOB_DAT rather than a RELATIVE reloc if:
6181 // 1) The symbol may be defined in some other module.
6182 // 2) We are building a shared library and this is a protected
6183 // symbol; using GLOB_DAT means that the dynamic linker can use
6184 // the address of the PLT in the main executable when appropriate
6185 // so that function address comparisons work.
6186 // 3) This is a STT_GNU_IFUNC symbol in position dependent code,
6187 // again so that function address comparisons work.
6188 if (gsym
->is_from_dynobj()
6189 || gsym
->is_undefined()
6190 || gsym
->is_preemptible()
6191 || (gsym
->visibility() == elfcpp::STV_PROTECTED
6192 && parameters
->options().shared())
6193 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
6194 && parameters
->options().output_is_position_independent()))
6195 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
,
6196 rela_dyn
, elfcpp::R_AARCH64_GLOB_DAT
);
6199 // For a STT_GNU_IFUNC symbol we want to write the PLT
6200 // offset into the GOT, so that function pointer
6201 // comparisons work correctly.
6203 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
6204 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
6207 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
6208 // Tell the dynamic linker to use the PLT address
6209 // when resolving relocations.
6210 if (gsym
->is_from_dynobj()
6211 && !parameters
->options().shared())
6212 gsym
->set_needs_dynsym_value();
6216 rela_dyn
->add_global_relative(
6217 gsym
, elfcpp::R_AARCH64_RELATIVE
,
6219 gsym
->got_offset(GOT_TYPE_STANDARD
),
6228 case elfcpp::R_AARCH64_TSTBR14
:
6229 case elfcpp::R_AARCH64_CONDBR19
:
6230 case elfcpp::R_AARCH64_JUMP26
:
6231 case elfcpp::R_AARCH64_CALL26
:
6233 if (gsym
->final_value_is_known())
6236 if (gsym
->is_defined() &&
6237 !gsym
->is_from_dynobj() &&
6238 !gsym
->is_preemptible())
6241 // Make plt entry for function call.
6242 target
->make_plt_entry(symtab
, layout
, gsym
);
6246 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6247 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // General dynamic
6249 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6250 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6251 if (tlsopt
== tls::TLSOPT_TO_LE
)
6253 layout
->set_has_static_tls();
6256 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
6259 Output_data_got_aarch64
<size
, big_endian
>* got
=
6260 target
->got_section(symtab
, layout
);
6261 // Create 2 consecutive entries for module index and offset.
6262 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
6263 target
->rela_dyn_section(layout
),
6264 elfcpp::R_AARCH64_TLS_DTPMOD64
,
6265 elfcpp::R_AARCH64_TLS_DTPREL64
);
6269 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6270 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local dynamic
6272 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6273 optimize_tls_reloc(!parameters
->options().shared(), r_type
);
6274 if (tlsopt
== tls::TLSOPT_NONE
)
6276 // Create a GOT entry for the module index.
6277 target
->got_mod_index_entry(symtab
, layout
, object
);
6279 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6280 unsupported_reloc_local(object
, r_type
);
6284 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6285 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6286 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6287 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local dynamic
6290 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6291 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial executable
6293 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6294 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6295 if (tlsopt
== tls::TLSOPT_TO_LE
)
6298 layout
->set_has_static_tls();
6299 // Create a GOT entry for the tp-relative offset.
6300 Output_data_got_aarch64
<size
, big_endian
>* got
6301 = target
->got_section(symtab
, layout
);
6302 if (!parameters
->doing_static_link())
6304 got
->add_global_with_rel(
6305 gsym
, GOT_TYPE_TLS_OFFSET
,
6306 target
->rela_dyn_section(layout
),
6307 elfcpp::R_AARCH64_TLS_TPREL64
);
6309 if (!gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
))
6311 got
->add_global(gsym
, GOT_TYPE_TLS_OFFSET
);
6312 unsigned int got_offset
=
6313 gsym
->got_offset(GOT_TYPE_TLS_OFFSET
);
6314 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6315 gold_assert(addend
== 0);
6316 got
->add_static_reloc(got_offset
,
6317 elfcpp::R_AARCH64_TLS_TPREL64
, gsym
);
6322 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6323 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6324 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6325 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6326 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6327 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6328 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6329 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
: // Local executable
6330 layout
->set_has_static_tls();
6331 if (parameters
->options().shared())
6332 gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."),
6333 object
->name().c_str(), r_type
);
6336 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6337 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6338 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
: // TLS descriptor
6340 target
->define_tls_base_symbol(symtab
, layout
);
6341 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6342 optimize_tls_reloc(gsym
->final_value_is_known(), r_type
);
6343 if (tlsopt
== tls::TLSOPT_NONE
)
6345 // Create reserved PLT and GOT entries for the resolver.
6346 target
->reserve_tlsdesc_entries(symtab
, layout
);
6348 // Create a double GOT entry with an R_AARCH64_TLSDESC
6349 // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT
6350 // entry needs to be in an area in .got.plt, not .got. Call
6351 // got_section to make sure the section has been created.
6352 target
->got_section(symtab
, layout
);
6353 Output_data_got
<size
, big_endian
>* got
=
6354 target
->got_tlsdesc_section();
6355 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
6356 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
6357 elfcpp::R_AARCH64_TLSDESC
, 0);
6359 else if (tlsopt
== tls::TLSOPT_TO_IE
)
6361 // Create a GOT entry for the tp-relative offset.
6362 Output_data_got
<size
, big_endian
>* got
6363 = target
->got_section(symtab
, layout
);
6364 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
6365 target
->rela_dyn_section(layout
),
6366 elfcpp::R_AARCH64_TLS_TPREL64
);
6368 else if (tlsopt
!= tls::TLSOPT_TO_LE
)
6369 unsupported_reloc_global(object
, r_type
, gsym
);
6373 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6377 gold_error(_("%s: unsupported reloc type in global scan"),
6378 aarch64_reloc_property_table
->
6379 reloc_name_in_error_message(r_type
).c_str());
6382 } // End of Scan::global
6385 // Create the PLT section.
6386 template<int size
, bool big_endian
>
6388 Target_aarch64
<size
, big_endian
>::make_plt_section(
6389 Symbol_table
* symtab
, Layout
* layout
)
6391 if (this->plt_
== NULL
)
6393 // Create the GOT section first.
6394 this->got_section(symtab
, layout
);
6396 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
6397 this->got_irelative_
);
6399 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
6401 | elfcpp::SHF_EXECINSTR
),
6402 this->plt_
, ORDER_PLT
, false);
6404 // Make the sh_info field of .rela.plt point to .plt.
6405 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
6406 rela_plt_os
->set_info_section(this->plt_
->output_section());
6410 // Return the section for TLSDESC relocations.
6412 template<int size
, bool big_endian
>
6413 typename Target_aarch64
<size
, big_endian
>::Reloc_section
*
6414 Target_aarch64
<size
, big_endian
>::rela_tlsdesc_section(Layout
* layout
) const
6416 return this->plt_section()->rela_tlsdesc(layout
);
6419 // Create a PLT entry for a global symbol.
6421 template<int size
, bool big_endian
>
6423 Target_aarch64
<size
, big_endian
>::make_plt_entry(
6424 Symbol_table
* symtab
,
6428 if (gsym
->has_plt_offset())
6431 if (this->plt_
== NULL
)
6432 this->make_plt_section(symtab
, layout
);
6434 this->plt_
->add_entry(symtab
, layout
, gsym
);
6437 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
6439 template<int size
, bool big_endian
>
6441 Target_aarch64
<size
, big_endian
>::make_local_ifunc_plt_entry(
6442 Symbol_table
* symtab
, Layout
* layout
,
6443 Sized_relobj_file
<size
, big_endian
>* relobj
,
6444 unsigned int local_sym_index
)
6446 if (relobj
->local_has_plt_offset(local_sym_index
))
6448 if (this->plt_
== NULL
)
6449 this->make_plt_section(symtab
, layout
);
6450 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
6453 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
6456 template<int size
, bool big_endian
>
6458 Target_aarch64
<size
, big_endian
>::gc_process_relocs(
6459 Symbol_table
* symtab
,
6461 Sized_relobj_file
<size
, big_endian
>* object
,
6462 unsigned int data_shndx
,
6463 unsigned int sh_type
,
6464 const unsigned char* prelocs
,
6466 Output_section
* output_section
,
6467 bool needs_special_offset_handling
,
6468 size_t local_symbol_count
,
6469 const unsigned char* plocal_symbols
)
6471 if (sh_type
== elfcpp::SHT_REL
)
6476 gold::gc_process_relocs
<
6478 Target_aarch64
<size
, big_endian
>,
6480 typename Target_aarch64
<size
, big_endian
>::Scan
,
6481 typename Target_aarch64
<size
, big_endian
>::Relocatable_size_for_reloc
>(
6490 needs_special_offset_handling
,
6495 // Scan relocations for a section.
6497 template<int size
, bool big_endian
>
6499 Target_aarch64
<size
, big_endian
>::scan_relocs(
6500 Symbol_table
* symtab
,
6502 Sized_relobj_file
<size
, big_endian
>* object
,
6503 unsigned int data_shndx
,
6504 unsigned int sh_type
,
6505 const unsigned char* prelocs
,
6507 Output_section
* output_section
,
6508 bool needs_special_offset_handling
,
6509 size_t local_symbol_count
,
6510 const unsigned char* plocal_symbols
)
6512 if (sh_type
== elfcpp::SHT_REL
)
6514 gold_error(_("%s: unsupported REL reloc section"),
6515 object
->name().c_str());
6518 gold::scan_relocs
<size
, big_endian
, Target_aarch64
, elfcpp::SHT_RELA
, Scan
>(
6527 needs_special_offset_handling
,
6532 // Return the value to use for a dynamic which requires special
6533 // treatment. This is how we support equality comparisons of function
6534 // pointers across shared library boundaries, as described in the
6535 // processor specific ABI supplement.
6537 template<int size
, bool big_endian
>
6539 Target_aarch64
<size
, big_endian
>::do_dynsym_value(const Symbol
* gsym
) const
6541 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
6542 return this->plt_address_for_global(gsym
);
6546 // Finalize the sections.
6548 template<int size
, bool big_endian
>
6550 Target_aarch64
<size
, big_endian
>::do_finalize_sections(
6552 const Input_objects
*,
6553 Symbol_table
* symtab
)
6555 const Reloc_section
* rel_plt
= (this->plt_
== NULL
6557 : this->plt_
->rela_plt());
6558 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
6559 this->rela_dyn_
, true, false);
6561 // Emit any relocs we saved in an attempt to avoid generating COPY
6563 if (this->copy_relocs_
.any_saved_relocs())
6564 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
6566 // Fill in some more dynamic tags.
6567 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
6570 if (this->plt_
!= NULL
6571 && this->plt_
->output_section() != NULL
6572 && this->plt_
->has_tlsdesc_entry())
6574 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
6575 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
6576 this->got_
->finalize_data_size();
6577 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
6578 this->plt_
, plt_offset
);
6579 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
6580 this->got_
, got_offset
);
6584 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
6585 // the .got.plt section.
6586 Symbol
* sym
= this->global_offset_table_
;
6589 uint64_t data_size
= this->got_plt_
->current_data_size();
6590 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
6592 // If the .got section is more than 0x8000 bytes, we add
6593 // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16
6594 // bit relocations have a greater chance of working.
6595 if (data_size
>= 0x8000)
6596 symtab
->get_sized_symbol
<size
>(sym
)->set_value(
6597 symtab
->get_sized_symbol
<size
>(sym
)->value() + 0x8000);
6600 if (parameters
->doing_static_link()
6601 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
6603 // If linking statically, make sure that the __rela_iplt symbols
6604 // were defined if necessary, even if we didn't create a PLT.
6605 static const Define_symbol_in_segment syms
[] =
6608 "__rela_iplt_start", // name
6609 elfcpp::PT_LOAD
, // segment_type
6610 elfcpp::PF_W
, // segment_flags_set
6611 elfcpp::PF(0), // segment_flags_clear
6614 elfcpp::STT_NOTYPE
, // type
6615 elfcpp::STB_GLOBAL
, // binding
6616 elfcpp::STV_HIDDEN
, // visibility
6618 Symbol::SEGMENT_START
, // offset_from_base
6622 "__rela_iplt_end", // name
6623 elfcpp::PT_LOAD
, // segment_type
6624 elfcpp::PF_W
, // segment_flags_set
6625 elfcpp::PF(0), // segment_flags_clear
6628 elfcpp::STT_NOTYPE
, // type
6629 elfcpp::STB_GLOBAL
, // binding
6630 elfcpp::STV_HIDDEN
, // visibility
6632 Symbol::SEGMENT_START
, // offset_from_base
6637 symtab
->define_symbols(layout
, 2, syms
,
6638 layout
->script_options()->saw_sections_clause());
6644 // Perform a relocation.
6646 template<int size
, bool big_endian
>
6648 Target_aarch64
<size
, big_endian
>::Relocate::relocate(
6649 const Relocate_info
<size
, big_endian
>* relinfo
,
6650 Target_aarch64
<size
, big_endian
>* target
,
6653 const elfcpp::Rela
<size
, big_endian
>& rela
,
6654 unsigned int r_type
,
6655 const Sized_symbol
<size
>* gsym
,
6656 const Symbol_value
<size
>* psymval
,
6657 unsigned char* view
,
6658 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
6659 section_size_type
/* view_size */)
6664 typedef AArch64_relocate_functions
<size
, big_endian
> Reloc
;
6666 const AArch64_reloc_property
* reloc_property
=
6667 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6669 if (reloc_property
== NULL
)
6671 std::string reloc_name
=
6672 aarch64_reloc_property_table
->reloc_name_in_error_message(r_type
);
6673 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6674 _("cannot relocate %s in object file"),
6675 reloc_name
.c_str());
6679 const Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6681 // Pick the value to use for symbols defined in the PLT.
6682 Symbol_value
<size
> symval
;
6684 && gsym
->use_plt_offset(reloc_property
->reference_flags()))
6686 symval
.set_output_value(target
->plt_address_for_global(gsym
));
6689 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
6691 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6692 if (object
->local_has_plt_offset(r_sym
))
6694 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
6699 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6701 // Get the GOT offset if needed.
6702 // For aarch64, the GOT pointer points to the start of the GOT section.
6703 bool have_got_offset
= false;
6705 int got_base
= (target
->got_
!= NULL
6706 ? (target
->got_
->current_data_size() >= 0x8000
6711 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0
:
6712 case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC
:
6713 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1
:
6714 case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC
:
6715 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2
:
6716 case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC
:
6717 case elfcpp::R_AARCH64_MOVW_GOTOFF_G3
:
6718 case elfcpp::R_AARCH64_GOTREL64
:
6719 case elfcpp::R_AARCH64_GOTREL32
:
6720 case elfcpp::R_AARCH64_GOT_LD_PREL19
:
6721 case elfcpp::R_AARCH64_LD64_GOTOFF_LO15
:
6722 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6723 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6724 case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15
:
6727 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
6728 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - got_base
;
6732 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6733 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
6734 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
6737 have_got_offset
= true;
6744 typename
Reloc::Status reloc_status
= Reloc::STATUS_OKAY
;
6745 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
6748 case elfcpp::R_AARCH64_NONE
:
6751 case elfcpp::R_AARCH64_ABS64
:
6752 reloc_status
= Reloc::template rela_ua
<64>(
6753 view
, object
, psymval
, addend
, reloc_property
);
6756 case elfcpp::R_AARCH64_ABS32
:
6757 reloc_status
= Reloc::template rela_ua
<32>(
6758 view
, object
, psymval
, addend
, reloc_property
);
6761 case elfcpp::R_AARCH64_ABS16
:
6762 reloc_status
= Reloc::template rela_ua
<16>(
6763 view
, object
, psymval
, addend
, reloc_property
);
6766 case elfcpp::R_AARCH64_PREL64
:
6767 reloc_status
= Reloc::template pcrela_ua
<64>(
6768 view
, object
, psymval
, addend
, address
, reloc_property
);
6771 case elfcpp::R_AARCH64_PREL32
:
6772 reloc_status
= Reloc::template pcrela_ua
<32>(
6773 view
, object
, psymval
, addend
, address
, reloc_property
);
6776 case elfcpp::R_AARCH64_PREL16
:
6777 reloc_status
= Reloc::template pcrela_ua
<16>(
6778 view
, object
, psymval
, addend
, address
, reloc_property
);
6781 case elfcpp::R_AARCH64_LD_PREL_LO19
:
6782 reloc_status
= Reloc::template pcrela_general
<32>(
6783 view
, object
, psymval
, addend
, address
, reloc_property
);
6786 case elfcpp::R_AARCH64_ADR_PREL_LO21
:
6787 reloc_status
= Reloc::adr(view
, object
, psymval
, addend
,
6788 address
, reloc_property
);
6791 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC
:
6792 case elfcpp::R_AARCH64_ADR_PREL_PG_HI21
:
6793 reloc_status
= Reloc::adrp(view
, object
, psymval
, addend
, address
,
6797 case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC
:
6798 case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC
:
6799 case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC
:
6800 case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC
:
6801 case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC
:
6802 case elfcpp::R_AARCH64_ADD_ABS_LO12_NC
:
6803 reloc_status
= Reloc::template rela_general
<32>(
6804 view
, object
, psymval
, addend
, reloc_property
);
6807 case elfcpp::R_AARCH64_CALL26
:
6808 if (this->skip_call_tls_get_addr_
)
6810 // Double check that the TLSGD insn has been optimized away.
6811 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
6812 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(
6813 reinterpret_cast<Insntype
*>(view
));
6814 gold_assert((insn
& 0xff000000) == 0x91000000);
6816 reloc_status
= Reloc::STATUS_OKAY
;
6817 this->skip_call_tls_get_addr_
= false;
6818 // Return false to stop further processing this reloc.
6822 case elfcpp::R_AARCH64_JUMP26
:
6823 if (Reloc::maybe_apply_stub(r_type
, relinfo
, rela
, view
, address
,
6824 gsym
, psymval
, object
,
6825 target
->stub_group_size_
))
6828 case elfcpp::R_AARCH64_TSTBR14
:
6829 case elfcpp::R_AARCH64_CONDBR19
:
6830 reloc_status
= Reloc::template pcrela_general
<32>(
6831 view
, object
, psymval
, addend
, address
, reloc_property
);
6834 case elfcpp::R_AARCH64_ADR_GOT_PAGE
:
6835 gold_assert(have_got_offset
);
6836 value
= target
->got_
->address() + got_base
+ got_offset
;
6837 reloc_status
= Reloc::adrp(view
, value
+ addend
, address
);
6840 case elfcpp::R_AARCH64_LD64_GOT_LO12_NC
:
6841 gold_assert(have_got_offset
);
6842 value
= target
->got_
->address() + got_base
+ got_offset
;
6843 reloc_status
= Reloc::template rela_general
<32>(
6844 view
, value
, addend
, reloc_property
);
6847 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6848 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6849 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
6850 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
6851 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
6852 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
6853 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
6854 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
6855 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
6856 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
6857 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
6858 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
6859 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
6860 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
6861 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
6862 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
6863 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
6864 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
6865 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
6866 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
6867 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
6868 case elfcpp::R_AARCH64_TLSDESC_CALL
:
6869 reloc_status
= relocate_tls(relinfo
, target
, relnum
, rela
, r_type
,
6870 gsym
, psymval
, view
, address
);
6873 // These are dynamic relocations, which are unexpected when linking.
6874 case elfcpp::R_AARCH64_COPY
:
6875 case elfcpp::R_AARCH64_GLOB_DAT
:
6876 case elfcpp::R_AARCH64_JUMP_SLOT
:
6877 case elfcpp::R_AARCH64_RELATIVE
:
6878 case elfcpp::R_AARCH64_IRELATIVE
:
6879 case elfcpp::R_AARCH64_TLS_DTPREL64
:
6880 case elfcpp::R_AARCH64_TLS_DTPMOD64
:
6881 case elfcpp::R_AARCH64_TLS_TPREL64
:
6882 case elfcpp::R_AARCH64_TLSDESC
:
6883 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6884 _("unexpected reloc %u in object file"),
6889 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6890 _("unsupported reloc %s"),
6891 reloc_property
->name().c_str());
6895 // Report any errors.
6896 switch (reloc_status
)
6898 case Reloc::STATUS_OKAY
:
6900 case Reloc::STATUS_OVERFLOW
:
6901 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
6902 _("relocation overflow in %s"),
6903 reloc_property
->name().c_str());
6905 case Reloc::STATUS_BAD_RELOC
:
6906 gold_error_at_location(
6909 rela
.get_r_offset(),
6910 _("unexpected opcode while processing relocation %s"),
6911 reloc_property
->name().c_str());
6921 template<int size
, bool big_endian
>
6923 typename AArch64_relocate_functions
<size
, big_endian
>::Status
6924 Target_aarch64
<size
, big_endian
>::Relocate::relocate_tls(
6925 const Relocate_info
<size
, big_endian
>* relinfo
,
6926 Target_aarch64
<size
, big_endian
>* target
,
6928 const elfcpp::Rela
<size
, big_endian
>& rela
,
6929 unsigned int r_type
, const Sized_symbol
<size
>* gsym
,
6930 const Symbol_value
<size
>* psymval
,
6931 unsigned char* view
,
6932 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
6934 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
6935 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
6937 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
6938 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
6939 const AArch64_reloc_property
* reloc_property
=
6940 aarch64_reloc_property_table
->get_reloc_property(r_type
);
6941 gold_assert(reloc_property
!= NULL
);
6943 const bool is_final
= (gsym
== NULL
6944 ? !parameters
->options().shared()
6945 : gsym
->final_value_is_known());
6946 tls::Tls_optimization tlsopt
= Target_aarch64
<size
, big_endian
>::
6947 optimize_tls_reloc(is_final
, r_type
);
6949 Sized_relobj_file
<size
, big_endian
>* object
= relinfo
->object
;
6950 int tls_got_offset_type
;
6953 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6954 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
: // Global-dynamic
6956 if (tlsopt
== tls::TLSOPT_TO_LE
)
6958 if (tls_segment
== NULL
)
6960 gold_assert(parameters
->errors()->error_count() > 0
6961 || issue_undefined_symbol_error(gsym
));
6962 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
6964 return tls_gd_to_le(relinfo
, target
, rela
, r_type
, view
,
6967 else if (tlsopt
== tls::TLSOPT_NONE
)
6969 tls_got_offset_type
= GOT_TYPE_TLS_PAIR
;
6970 // Firstly get the address for the got entry.
6971 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
6974 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
6975 got_entry_address
= target
->got_
->address() +
6976 gsym
->got_offset(tls_got_offset_type
);
6980 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
6982 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
6983 got_entry_address
= target
->got_
->address() +
6984 object
->local_got_offset(r_sym
, tls_got_offset_type
);
6987 // Relocate the address into adrp/ld, adrp/add pair.
6990 case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21
:
6991 return aarch64_reloc_funcs::adrp(
6992 view
, got_entry_address
+ addend
, address
);
6996 case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
:
6997 return aarch64_reloc_funcs::template rela_general
<32>(
6998 view
, got_entry_address
, addend
, reloc_property
);
7005 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
7006 _("unsupported gd_to_ie relaxation on %u"),
7011 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7012 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
: // Local-dynamic
7014 if (tlsopt
== tls::TLSOPT_TO_LE
)
7016 if (tls_segment
== NULL
)
7018 gold_assert(parameters
->errors()->error_count() > 0
7019 || issue_undefined_symbol_error(gsym
));
7020 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7022 return this->tls_ld_to_le(relinfo
, target
, rela
, r_type
, view
,
7026 gold_assert(tlsopt
== tls::TLSOPT_NONE
);
7027 // Relocate the field with the offset of the GOT entry for
7028 // the module index.
7029 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7030 got_entry_address
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
) +
7031 target
->got_
->address());
7035 case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21
:
7036 return aarch64_reloc_funcs::adrp(
7037 view
, got_entry_address
+ addend
, address
);
7040 case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
:
7041 return aarch64_reloc_funcs::template rela_general
<32>(
7042 view
, got_entry_address
, addend
, reloc_property
);
7051 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7052 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7053 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7054 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
: // Other local-dynamic
7056 AArch64_address value
= psymval
->value(object
, 0);
7057 if (tlsopt
== tls::TLSOPT_TO_LE
)
7059 if (tls_segment
== NULL
)
7061 gold_assert(parameters
->errors()->error_count() > 0
7062 || issue_undefined_symbol_error(gsym
));
7063 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7068 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1
:
7069 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7073 case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC
:
7074 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12
:
7075 case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC
:
7076 return aarch64_reloc_funcs::template rela_general
<32>(
7077 view
, value
, addend
, reloc_property
);
7083 // We should never reach here.
7087 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7088 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
: // Initial-exec
7090 if (tlsopt
== tls::TLSOPT_TO_LE
)
7092 if (tls_segment
== NULL
)
7094 gold_assert(parameters
->errors()->error_count() > 0
7095 || issue_undefined_symbol_error(gsym
));
7096 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7098 return tls_ie_to_le(relinfo
, target
, rela
, r_type
, view
,
7101 tls_got_offset_type
= GOT_TYPE_TLS_OFFSET
;
7103 // Firstly get the address for the got entry.
7104 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7107 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7108 got_entry_address
= target
->got_
->address() +
7109 gsym
->got_offset(tls_got_offset_type
);
7113 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7115 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7116 got_entry_address
= target
->got_
->address() +
7117 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7119 // Relocate the address into adrp/ld, adrp/add pair.
7122 case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
:
7123 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7126 case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
:
7127 return aarch64_reloc_funcs::template rela_general
<32>(
7128 view
, got_entry_address
, addend
, reloc_property
);
7133 // We shall never reach here.
7136 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7137 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7138 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC
:
7139 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7140 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC
:
7141 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
:
7142 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
:
7143 case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC
:
7145 gold_assert(tls_segment
!= NULL
);
7146 AArch64_address value
= psymval
->value(object
, 0);
7148 if (!parameters
->options().shared())
7150 AArch64_address aligned_tcb_size
=
7151 align_address(target
->tcb_size(),
7152 tls_segment
->maximum_alignment());
7153 value
+= aligned_tcb_size
;
7156 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2
:
7157 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1
:
7158 case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0
:
7159 return aarch64_reloc_funcs::movnz(view
, value
+ addend
,
7162 return aarch64_reloc_funcs::template
7163 rela_general
<32>(view
,
7170 gold_error(_("%s: unsupported reloc %u "
7171 "in non-static TLSLE mode."),
7172 object
->name().c_str(), r_type
);
7176 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7177 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7178 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7179 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7181 if (tlsopt
== tls::TLSOPT_TO_LE
)
7183 if (tls_segment
== NULL
)
7185 gold_assert(parameters
->errors()->error_count() > 0
7186 || issue_undefined_symbol_error(gsym
));
7187 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7189 return tls_desc_gd_to_le(relinfo
, target
, rela
, r_type
,
7194 tls_got_offset_type
= (tlsopt
== tls::TLSOPT_TO_IE
7195 ? GOT_TYPE_TLS_OFFSET
7196 : GOT_TYPE_TLS_DESC
);
7197 unsigned int got_tlsdesc_offset
= 0;
7198 if (r_type
!= elfcpp::R_AARCH64_TLSDESC_CALL
7199 && tlsopt
== tls::TLSOPT_NONE
)
7201 // We created GOT entries in the .got.tlsdesc portion of the
7202 // .got.plt section, but the offset stored in the symbol is the
7203 // offset within .got.tlsdesc.
7204 got_tlsdesc_offset
= (target
->got_
->data_size()
7205 + target
->got_plt_section()->data_size());
7207 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
;
7210 gold_assert(gsym
->has_got_offset(tls_got_offset_type
));
7211 got_entry_address
= target
->got_
->address()
7212 + got_tlsdesc_offset
7213 + gsym
->got_offset(tls_got_offset_type
);
7217 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
7219 object
->local_has_got_offset(r_sym
, tls_got_offset_type
));
7220 got_entry_address
= target
->got_
->address() +
7221 got_tlsdesc_offset
+
7222 object
->local_got_offset(r_sym
, tls_got_offset_type
);
7224 if (tlsopt
== tls::TLSOPT_TO_IE
)
7226 if (tls_segment
== NULL
)
7228 gold_assert(parameters
->errors()->error_count() > 0
7229 || issue_undefined_symbol_error(gsym
));
7230 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7232 return tls_desc_gd_to_ie(relinfo
, target
, rela
, r_type
,
7233 view
, psymval
, got_entry_address
,
7237 // Now do tlsdesc relocation.
7240 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7241 return aarch64_reloc_funcs::adrp(view
,
7242 got_entry_address
+ addend
,
7245 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7246 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7247 return aarch64_reloc_funcs::template rela_general
<32>(
7248 view
, got_entry_address
, addend
, reloc_property
);
7250 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7251 return aarch64_reloc_funcs::STATUS_OKAY
;
7261 gold_error(_("%s: unsupported TLS reloc %u."),
7262 object
->name().c_str(), r_type
);
7264 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7265 } // End of relocate_tls.
7268 template<int size
, bool big_endian
>
7270 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7271 Target_aarch64
<size
, big_endian
>::Relocate::tls_gd_to_le(
7272 const Relocate_info
<size
, big_endian
>* relinfo
,
7273 Target_aarch64
<size
, big_endian
>* target
,
7274 const elfcpp::Rela
<size
, big_endian
>& rela
,
7275 unsigned int r_type
,
7276 unsigned char* view
,
7277 const Symbol_value
<size
>* psymval
)
7279 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7280 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7281 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7283 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7284 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7285 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7286 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7288 if (r_type
== elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC
)
7290 // This is the 2nd relocs, optimization should already have been
7292 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7293 return aarch64_reloc_funcs::STATUS_OKAY
;
7296 // The original sequence is -
7297 // 90000000 adrp x0, 0 <main>
7298 // 91000000 add x0, x0, #0x0
7299 // 94000000 bl 0 <__tls_get_addr>
7300 // optimized to sequence -
7301 // d53bd040 mrs x0, tpidr_el0
7302 // 91400000 add x0, x0, #0x0, lsl #12
7303 // 91000000 add x0, x0, #0x0
7305 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7306 // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we
7307 // have to change "bl tls_get_addr", which does not have a corresponding tls
7308 // relocation type. So before proceeding, we need to make sure compiler
7309 // does not change the sequence.
7310 if(!(insn1
== 0x90000000 // adrp x0,0
7311 && insn2
== 0x91000000 // add x0, x0, #0x0
7312 && insn3
== 0x94000000)) // bl 0
7314 // Ideally we should give up gd_to_le relaxation and do gd access.
7315 // However the gd_to_le relaxation decision has been made early
7316 // in the scan stage, where we did not allocate any GOT entry for
7317 // this symbol. Therefore we have to exit and report error now.
7318 gold_error(_("unexpected reloc insn sequence while relaxing "
7319 "tls gd to le for reloc %u."), r_type
);
7320 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7324 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7325 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7326 insn3
= 0x91000000; // add x0, x0, #0x0
7327 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7328 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7329 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7331 // Calculate tprel value.
7332 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7333 gold_assert(tls_segment
!= NULL
);
7334 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7335 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7336 AArch64_address aligned_tcb_size
=
7337 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7338 AArch64_address x
= value
+ aligned_tcb_size
;
7340 // After new insns are written, apply TLSLE relocs.
7341 const AArch64_reloc_property
* rp1
=
7342 aarch64_reloc_property_table
->get_reloc_property(
7343 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7344 const AArch64_reloc_property
* rp2
=
7345 aarch64_reloc_property_table
->get_reloc_property(
7346 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7347 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7349 typename
aarch64_reloc_funcs::Status s1
=
7350 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7354 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7357 typename
aarch64_reloc_funcs::Status s2
=
7358 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7363 this->skip_call_tls_get_addr_
= true;
7365 } // End of tls_gd_to_le
7368 template<int size
, bool big_endian
>
7370 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7371 Target_aarch64
<size
, big_endian
>::Relocate::tls_ld_to_le(
7372 const Relocate_info
<size
, big_endian
>* relinfo
,
7373 Target_aarch64
<size
, big_endian
>* target
,
7374 const elfcpp::Rela
<size
, big_endian
>& rela
,
7375 unsigned int r_type
,
7376 unsigned char* view
,
7377 const Symbol_value
<size
>* psymval
)
7379 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7380 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7381 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7383 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7384 Insntype insn1
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7385 Insntype insn2
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 1);
7386 Insntype insn3
= elfcpp::Swap
<32, big_endian
>::readval(ip
+ 2);
7388 if (r_type
== elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC
)
7390 // This is the 2nd relocs, optimization should already have been
7392 gold_assert((insn1
& 0xfff00000) == 0x91400000);
7393 return aarch64_reloc_funcs::STATUS_OKAY
;
7396 // The original sequence is -
7397 // 90000000 adrp x0, 0 <main>
7398 // 91000000 add x0, x0, #0x0
7399 // 94000000 bl 0 <__tls_get_addr>
7400 // optimized to sequence -
7401 // d53bd040 mrs x0, tpidr_el0
7402 // 91400000 add x0, x0, #0x0, lsl #12
7403 // 91000000 add x0, x0, #0x0
7405 // Unlike tls_ie_to_le, we change the 3 insns in one function call when we
7406 // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we
7407 // have to change "bl tls_get_addr", which does not have a corresponding tls
7408 // relocation type. So before proceeding, we need to make sure compiler
7409 // does not change the sequence.
7410 if(!(insn1
== 0x90000000 // adrp x0,0
7411 && insn2
== 0x91000000 // add x0, x0, #0x0
7412 && insn3
== 0x94000000)) // bl 0
7414 // Ideally we should give up gd_to_le relaxation and do gd access.
7415 // However the gd_to_le relaxation decision has been made early
7416 // in the scan stage, where we did not allocate any GOT entry for
7417 // this symbol. Therefore we have to exit and report error now.
7418 gold_error(_("unexpected reloc insn sequence while relaxing "
7419 "tls gd to le for reloc %u."), r_type
);
7420 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7424 insn1
= 0xd53bd040; // mrs x0, tpidr_el0
7425 insn2
= 0x91400000; // add x0, x0, #0x0, lsl #12
7426 insn3
= 0x91000000; // add x0, x0, #0x0
7427 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn1
);
7428 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 1, insn2
);
7429 elfcpp::Swap
<32, big_endian
>::writeval(ip
+ 2, insn3
);
7431 // Calculate tprel value.
7432 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7433 gold_assert(tls_segment
!= NULL
);
7434 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7435 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7436 AArch64_address aligned_tcb_size
=
7437 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7438 AArch64_address x
= value
+ aligned_tcb_size
;
7440 // After new insns are written, apply TLSLE relocs.
7441 const AArch64_reloc_property
* rp1
=
7442 aarch64_reloc_property_table
->get_reloc_property(
7443 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12
);
7444 const AArch64_reloc_property
* rp2
=
7445 aarch64_reloc_property_table
->get_reloc_property(
7446 elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12
);
7447 gold_assert(rp1
!= NULL
&& rp2
!= NULL
);
7449 typename
aarch64_reloc_funcs::Status s1
=
7450 aarch64_reloc_funcs::template rela_general
<32>(view
+ 4,
7454 if (s1
!= aarch64_reloc_funcs::STATUS_OKAY
)
7457 typename
aarch64_reloc_funcs::Status s2
=
7458 aarch64_reloc_funcs::template rela_general
<32>(view
+ 8,
7463 this->skip_call_tls_get_addr_
= true;
7466 } // End of tls_ld_to_le
7468 template<int size
, bool big_endian
>
7470 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7471 Target_aarch64
<size
, big_endian
>::Relocate::tls_ie_to_le(
7472 const Relocate_info
<size
, big_endian
>* relinfo
,
7473 Target_aarch64
<size
, big_endian
>* target
,
7474 const elfcpp::Rela
<size
, big_endian
>& rela
,
7475 unsigned int r_type
,
7476 unsigned char* view
,
7477 const Symbol_value
<size
>* psymval
)
7479 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7480 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7481 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7483 AArch64_address value
= psymval
->value(relinfo
->object
, 0);
7484 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7485 AArch64_address aligned_tcb_address
=
7486 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7487 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7488 AArch64_address x
= value
+ addend
+ aligned_tcb_address
;
7489 // "x" is the offset to tp, we can only do this if x is within
7490 // range [0, 2^32-1]
7491 if (!(size
== 32 || (size
== 64 && (static_cast<uint64_t>(x
) >> 32) == 0)))
7493 gold_error(_("TLS variable referred by reloc %u is too far from TP."),
7495 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7498 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7499 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7502 if (r_type
== elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21
)
7505 regno
= (insn
& 0x1f);
7506 newinsn
= (0xd2a00000 | regno
) | (((x
>> 16) & 0xffff) << 5);
7508 else if (r_type
== elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
)
7511 regno
= (insn
& 0x1f);
7512 gold_assert(regno
== ((insn
>> 5) & 0x1f));
7513 newinsn
= (0xf2800000 | regno
) | ((x
& 0xffff) << 5);
7518 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7519 return aarch64_reloc_funcs::STATUS_OKAY
;
7520 } // End of tls_ie_to_le
7523 template<int size
, bool big_endian
>
7525 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7526 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_le(
7527 const Relocate_info
<size
, big_endian
>* relinfo
,
7528 Target_aarch64
<size
, big_endian
>* target
,
7529 const elfcpp::Rela
<size
, big_endian
>& rela
,
7530 unsigned int r_type
,
7531 unsigned char* view
,
7532 const Symbol_value
<size
>* psymval
)
7534 typedef typename
elfcpp::Elf_types
<size
>::Elf_Addr AArch64_address
;
7535 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7536 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7538 // TLSDESC-GD sequence is like:
7539 // adrp x0, :tlsdesc:v1
7540 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7541 // add x0, x0, :tlsdesc_lo12:v1
7544 // After desc_gd_to_le optimization, the sequence will be like:
7545 // movz x0, #0x0, lsl #16
7550 // Calculate tprel value.
7551 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
7552 gold_assert(tls_segment
!= NULL
);
7553 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7554 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7555 AArch64_address value
= psymval
->value(relinfo
->object
, addend
);
7556 AArch64_address aligned_tcb_size
=
7557 align_address(target
->tcb_size(), tls_segment
->maximum_alignment());
7558 AArch64_address x
= value
+ aligned_tcb_size
;
7559 // x is the offset to tp, we can only do this if x is within range
7560 // [0, 2^32-1]. If x is out of range, fail and exit.
7561 if (size
== 64 && (static_cast<uint64_t>(x
) >> 32) != 0)
7563 gold_error(_("TLS variable referred by reloc %u is too far from TP. "
7564 "We Can't do gd_to_le relaxation.\n"), r_type
);
7565 return aarch64_reloc_funcs::STATUS_BAD_RELOC
;
7570 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7571 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7573 newinsn
= 0xd503201f;
7576 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7578 newinsn
= 0xd2a00000 | (((x
>> 16) & 0xffff) << 5);
7581 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7583 newinsn
= 0xf2800000 | ((x
& 0xffff) << 5);
7587 gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"),
7591 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7592 return aarch64_reloc_funcs::STATUS_OKAY
;
7593 } // End of tls_desc_gd_to_le
7596 template<int size
, bool big_endian
>
7598 typename AArch64_relocate_functions
<size
, big_endian
>::Status
7599 Target_aarch64
<size
, big_endian
>::Relocate::tls_desc_gd_to_ie(
7600 const Relocate_info
<size
, big_endian
>* /* relinfo */,
7601 Target_aarch64
<size
, big_endian
>* /* target */,
7602 const elfcpp::Rela
<size
, big_endian
>& rela
,
7603 unsigned int r_type
,
7604 unsigned char* view
,
7605 const Symbol_value
<size
>* /* psymval */,
7606 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_entry_address
,
7607 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
)
7609 typedef typename
elfcpp::Swap
<32, big_endian
>::Valtype Insntype
;
7610 typedef AArch64_relocate_functions
<size
, big_endian
> aarch64_reloc_funcs
;
7612 // TLSDESC-GD sequence is like:
7613 // adrp x0, :tlsdesc:v1
7614 // ldr x1, [x0, #:tlsdesc_lo12:v1]
7615 // add x0, x0, :tlsdesc_lo12:v1
7618 // After desc_gd_to_ie optimization, the sequence will be like:
7619 // adrp x0, :tlsie:v1
7620 // ldr x0, [x0, :tlsie_lo12:v1]
7624 Insntype
* ip
= reinterpret_cast<Insntype
*>(view
);
7625 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
7629 case elfcpp::R_AARCH64_TLSDESC_ADD_LO12
:
7630 case elfcpp::R_AARCH64_TLSDESC_CALL
:
7632 newinsn
= 0xd503201f;
7633 elfcpp::Swap
<32, big_endian
>::writeval(ip
, newinsn
);
7636 case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21
:
7638 return aarch64_reloc_funcs::adrp(view
, got_entry_address
+ addend
,
7643 case elfcpp::R_AARCH64_TLSDESC_LD64_LO12
:
7645 // Set ldr target register to be x0.
7646 Insntype insn
= elfcpp::Swap
<32, big_endian
>::readval(ip
);
7648 elfcpp::Swap
<32, big_endian
>::writeval(ip
, insn
);
7650 const AArch64_reloc_property
* reloc_property
=
7651 aarch64_reloc_property_table
->get_reloc_property(
7652 elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC
);
7653 return aarch64_reloc_funcs::template rela_general
<32>(
7654 view
, got_entry_address
, addend
, reloc_property
);
7659 gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"),
7663 return aarch64_reloc_funcs::STATUS_OKAY
;
7664 } // End of tls_desc_gd_to_ie
7666 // Relocate section data.
7668 template<int size
, bool big_endian
>
7670 Target_aarch64
<size
, big_endian
>::relocate_section(
7671 const Relocate_info
<size
, big_endian
>* relinfo
,
7672 unsigned int sh_type
,
7673 const unsigned char* prelocs
,
7675 Output_section
* output_section
,
7676 bool needs_special_offset_handling
,
7677 unsigned char* view
,
7678 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
7679 section_size_type view_size
,
7680 const Reloc_symbol_changes
* reloc_symbol_changes
)
7682 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7683 typedef typename Target_aarch64
<size
, big_endian
>::Relocate AArch64_relocate
;
7684 gold::relocate_section
<size
, big_endian
, Target_aarch64
, elfcpp::SHT_RELA
,
7685 AArch64_relocate
, gold::Default_comdat_behavior
>(
7691 needs_special_offset_handling
,
7695 reloc_symbol_changes
);
7698 // Return the size of a relocation while scanning during a relocatable
7701 template<int size
, bool big_endian
>
7703 Target_aarch64
<size
, big_endian
>::Relocatable_size_for_reloc::
7708 // We will never support SHT_REL relocations.
7713 // Scan the relocs during a relocatable link.
7715 template<int size
, bool big_endian
>
7717 Target_aarch64
<size
, big_endian
>::scan_relocatable_relocs(
7718 Symbol_table
* symtab
,
7720 Sized_relobj_file
<size
, big_endian
>* object
,
7721 unsigned int data_shndx
,
7722 unsigned int sh_type
,
7723 const unsigned char* prelocs
,
7725 Output_section
* output_section
,
7726 bool needs_special_offset_handling
,
7727 size_t local_symbol_count
,
7728 const unsigned char* plocal_symbols
,
7729 Relocatable_relocs
* rr
)
7731 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7733 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
7734 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
7736 gold::scan_relocatable_relocs
<size
, big_endian
, elfcpp::SHT_RELA
,
7737 Scan_relocatable_relocs
>(
7745 needs_special_offset_handling
,
7751 // Relocate a section during a relocatable link.
7753 template<int size
, bool big_endian
>
7755 Target_aarch64
<size
, big_endian
>::relocate_relocs(
7756 const Relocate_info
<size
, big_endian
>* relinfo
,
7757 unsigned int sh_type
,
7758 const unsigned char* prelocs
,
7760 Output_section
* output_section
,
7761 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
7762 const Relocatable_relocs
* rr
,
7763 unsigned char* view
,
7764 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
7765 section_size_type view_size
,
7766 unsigned char* reloc_view
,
7767 section_size_type reloc_view_size
)
7769 gold_assert(sh_type
== elfcpp::SHT_RELA
);
7771 gold::relocate_relocs
<size
, big_endian
, elfcpp::SHT_RELA
>(
7776 offset_in_output_section
,
7786 // Return whether this is a 3-insn erratum sequence.
7788 template<int size
, bool big_endian
>
7790 Target_aarch64
<size
, big_endian
>::is_erratum_843419_sequence(
7791 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
7792 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
,
7793 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn3
)
7798 // The 2nd insn is a single register load or store; or register pair
7800 if (Insn_utilities::aarch64_mem_op_p(insn2
, &rt1
, &rt2
, &pair
, &load
)
7801 && (!pair
|| (pair
&& !load
)))
7803 // The 3rd insn is a load or store instruction from the "Load/store
7804 // register (unsigned immediate)" encoding class, using Rn as the
7805 // base address register.
7806 if (Insn_utilities::aarch64_ldst_uimm(insn3
)
7807 && (Insn_utilities::aarch64_rn(insn3
)
7808 == Insn_utilities::aarch64_rd(insn1
)))
7815 // Return whether this is a 835769 sequence.
7816 // (Similarly implemented as in elfnn-aarch64.c.)
7818 template<int size
, bool big_endian
>
7820 Target_aarch64
<size
, big_endian
>::is_erratum_835769_sequence(
7821 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn1
,
7822 typename
elfcpp::Swap
<32,big_endian
>::Valtype insn2
)
7832 if (Insn_utilities::aarch64_mlxl(insn2
)
7833 && Insn_utilities::aarch64_mem_op_p (insn1
, &rt
, &rt2
, &pair
, &load
))
7835 /* Any SIMD memory op is independent of the subsequent MLA
7836 by definition of the erratum. */
7837 if (Insn_utilities::aarch64_bit(insn1
, 26))
7840 /* If not SIMD, check for integer memory ops and MLA relationship. */
7841 rn
= Insn_utilities::aarch64_rn(insn2
);
7842 ra
= Insn_utilities::aarch64_ra(insn2
);
7843 rm
= Insn_utilities::aarch64_rm(insn2
);
7845 /* If this is a load and there's a true(RAW) dependency, we are safe
7846 and this is not an erratum sequence. */
7848 (rt
== rn
|| rt
== rm
|| rt
== ra
7849 || (pair
&& (rt2
== rn
|| rt2
== rm
|| rt2
== ra
))))
7852 /* We conservatively put out stubs for all other cases (including
7861 // Helper method to create erratum stub for ST_E_843419 and ST_E_835769.
7863 template<int size
, bool big_endian
>
7865 Target_aarch64
<size
, big_endian
>::create_erratum_stub(
7866 AArch64_relobj
<size
, big_endian
>* relobj
,
7868 section_size_type erratum_insn_offset
,
7869 Address erratum_address
,
7870 typename
Insn_utilities::Insntype erratum_insn
,
7873 gold_assert(erratum_type
== ST_E_843419
|| erratum_type
== ST_E_835769
);
7874 The_stub_table
* stub_table
= relobj
->stub_table(shndx
);
7875 gold_assert(stub_table
!= NULL
);
7876 if (stub_table
->find_erratum_stub(relobj
,
7878 erratum_insn_offset
) == NULL
)
7880 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
7881 The_erratum_stub
* stub
= new The_erratum_stub(
7882 relobj
, erratum_type
, shndx
, erratum_insn_offset
);
7883 stub
->set_erratum_insn(erratum_insn
);
7884 stub
->set_erratum_address(erratum_address
);
7885 // For erratum ST_E_843419 and ST_E_835769, the destination address is
7886 // always the next insn after erratum insn.
7887 stub
->set_destination_address(erratum_address
+ BPI
);
7888 stub_table
->add_erratum_stub(stub
);
7893 // Scan erratum for section SHNDX range [output_address + span_start,
7894 // output_address + span_end). Note here we do not share the code with
7895 // scan_erratum_843419_span function, because for 843419 we optimize by only
7896 // scanning the last few insns of a page, whereas for 835769, we need to scan
7899 template<int size
, bool big_endian
>
7901 Target_aarch64
<size
, big_endian
>::scan_erratum_835769_span(
7902 AArch64_relobj
<size
, big_endian
>* relobj
,
7904 const section_size_type span_start
,
7905 const section_size_type span_end
,
7906 unsigned char* input_view
,
7907 Address output_address
)
7909 typedef typename
Insn_utilities::Insntype Insntype
;
7911 const int BPI
= AArch64_insn_utilities
<big_endian
>::BYTES_PER_INSN
;
7913 // Adjust output_address and view to the start of span.
7914 output_address
+= span_start
;
7915 input_view
+= span_start
;
7917 section_size_type span_length
= span_end
- span_start
;
7918 section_size_type offset
= 0;
7919 for (offset
= 0; offset
+ BPI
< span_length
; offset
+= BPI
)
7921 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
7922 Insntype insn1
= ip
[0];
7923 Insntype insn2
= ip
[1];
7924 if (is_erratum_835769_sequence(insn1
, insn2
))
7926 Insntype erratum_insn
= insn2
;
7927 // "span_start + offset" is the offset for insn1. So for insn2, it is
7928 // "span_start + offset + BPI".
7929 section_size_type erratum_insn_offset
= span_start
+ offset
+ BPI
;
7930 Address erratum_address
= output_address
+ offset
+ BPI
;
7931 gold_warning(_("Erratum 835769 found and fixed at \"%s\", "
7932 "section %d, offset 0x%08x."),
7933 relobj
->name().c_str(), shndx
,
7934 (unsigned int)(span_start
+ offset
));
7936 this->create_erratum_stub(relobj
, shndx
,
7937 erratum_insn_offset
, erratum_address
,
7938 erratum_insn
, ST_E_835769
);
7939 offset
+= BPI
; // Skip mac insn.
7942 } // End of "Target_aarch64::scan_erratum_835769_span".
7945 // Scan erratum for section SHNDX range
7946 // [output_address + span_start, output_address + span_end).
7948 template<int size
, bool big_endian
>
7950 Target_aarch64
<size
, big_endian
>::scan_erratum_843419_span(
7951 AArch64_relobj
<size
, big_endian
>* relobj
,
7953 const section_size_type span_start
,
7954 const section_size_type span_end
,
7955 unsigned char* input_view
,
7956 Address output_address
)
7958 typedef typename
Insn_utilities::Insntype Insntype
;
7960 // Adjust output_address and view to the start of span.
7961 output_address
+= span_start
;
7962 input_view
+= span_start
;
7964 if ((output_address
& 0x03) != 0)
7967 section_size_type offset
= 0;
7968 section_size_type span_length
= span_end
- span_start
;
7969 // The first instruction must be ending at 0xFF8 or 0xFFC.
7970 unsigned int page_offset
= output_address
& 0xFFF;
7971 // Make sure starting position, that is "output_address+offset",
7972 // starts at page position 0xff8 or 0xffc.
7973 if (page_offset
< 0xff8)
7974 offset
= 0xff8 - page_offset
;
7975 while (offset
+ 3 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
7977 Insntype
* ip
= reinterpret_cast<Insntype
*>(input_view
+ offset
);
7978 Insntype insn1
= ip
[0];
7979 if (Insn_utilities::is_adrp(insn1
))
7981 Insntype insn2
= ip
[1];
7982 Insntype insn3
= ip
[2];
7983 Insntype erratum_insn
;
7984 unsigned insn_offset
;
7985 bool do_report
= false;
7986 if (is_erratum_843419_sequence(insn1
, insn2
, insn3
))
7989 erratum_insn
= insn3
;
7990 insn_offset
= 2 * Insn_utilities::BYTES_PER_INSN
;
7992 else if (offset
+ 4 * Insn_utilities::BYTES_PER_INSN
<= span_length
)
7994 // Optionally we can have an insn between ins2 and ins3
7995 Insntype insn_opt
= ip
[2];
7996 // And insn_opt must not be a branch.
7997 if (!Insn_utilities::aarch64_b(insn_opt
)
7998 && !Insn_utilities::aarch64_bl(insn_opt
)
7999 && !Insn_utilities::aarch64_blr(insn_opt
)
8000 && !Insn_utilities::aarch64_br(insn_opt
))
8002 // And insn_opt must not write to dest reg in insn1. However
8003 // we do a conservative scan, which means we may fix/report
8004 // more than necessary, but it doesn't hurt.
8006 Insntype insn4
= ip
[3];
8007 if (is_erratum_843419_sequence(insn1
, insn2
, insn4
))
8010 erratum_insn
= insn4
;
8011 insn_offset
= 3 * Insn_utilities::BYTES_PER_INSN
;
8017 gold_warning(_("Erratum 843419 found and fixed at \"%s\", "
8018 "section %d, offset 0x%08x."),
8019 relobj
->name().c_str(), shndx
,
8020 (unsigned int)(span_start
+ offset
));
8021 unsigned int erratum_insn_offset
=
8022 span_start
+ offset
+ insn_offset
;
8023 Address erratum_address
=
8024 output_address
+ offset
+ insn_offset
;
8025 create_erratum_stub(relobj
, shndx
,
8026 erratum_insn_offset
, erratum_address
,
8027 erratum_insn
, ST_E_843419
);
8031 // Advance to next candidate instruction. We only consider instruction
8032 // sequences starting at a page offset of 0xff8 or 0xffc.
8033 page_offset
= (output_address
+ offset
) & 0xfff;
8034 if (page_offset
== 0xff8)
8036 else // (page_offset == 0xffc), we move to next page's 0xff8.
8039 } // End of "Target_aarch64::scan_erratum_843419_span".
8042 // The selector for aarch64 object files.
8044 template<int size
, bool big_endian
>
8045 class Target_selector_aarch64
: public Target_selector
8048 Target_selector_aarch64();
8051 do_instantiate_target()
8052 { return new Target_aarch64
<size
, big_endian
>(); }
8056 Target_selector_aarch64
<32, true>::Target_selector_aarch64()
8057 : Target_selector(elfcpp::EM_AARCH64
, 32, true,
8058 "elf32-bigaarch64", "aarch64_elf32_be_vec")
8062 Target_selector_aarch64
<32, false>::Target_selector_aarch64()
8063 : Target_selector(elfcpp::EM_AARCH64
, 32, false,
8064 "elf32-littleaarch64", "aarch64_elf32_le_vec")
8068 Target_selector_aarch64
<64, true>::Target_selector_aarch64()
8069 : Target_selector(elfcpp::EM_AARCH64
, 64, true,
8070 "elf64-bigaarch64", "aarch64_elf64_be_vec")
8074 Target_selector_aarch64
<64, false>::Target_selector_aarch64()
8075 : Target_selector(elfcpp::EM_AARCH64
, 64, false,
8076 "elf64-littleaarch64", "aarch64_elf64_le_vec")
8079 Target_selector_aarch64
<32, true> target_selector_aarch64elf32b
;
8080 Target_selector_aarch64
<32, false> target_selector_aarch64elf32
;
8081 Target_selector_aarch64
<64, true> target_selector_aarch64elfb
;
8082 Target_selector_aarch64
<64, false> target_selector_aarch64elf
;
8084 } // End anonymous namespace.