1 // x86_64.cc -- x86_64 target support for gold.
3 // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@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.
28 #include "parameters.h"
35 #include "copy-relocs.h"
37 #include "target-reloc.h"
38 #include "target-select.h"
48 class Output_data_plt_x86_64
;
50 // The x86_64 target class.
52 // http://www.x86-64.org/documentation/abi.pdf
53 // TLS info comes from
54 // http://people.redhat.com/drepper/tls.pdf
55 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
57 class Target_x86_64
: public Target_freebsd
<64, false>
60 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
61 // uses only Elf64_Rela relocation entries with explicit addends."
62 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false> Reloc_section
;
65 : Target_freebsd
<64, false>(&x86_64_info
),
66 got_(NULL
), plt_(NULL
), got_plt_(NULL
), rela_dyn_(NULL
),
67 copy_relocs_(elfcpp::R_X86_64_COPY
), dynbss_(NULL
),
68 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
71 // Hook for a new output section.
73 do_new_output_section(Output_section
*) const;
75 // Scan the relocations to look for symbol adjustments.
77 gc_process_relocs(Symbol_table
* symtab
,
79 Sized_relobj
<64, false>* object
,
80 unsigned int data_shndx
,
82 const unsigned char* prelocs
,
84 Output_section
* output_section
,
85 bool needs_special_offset_handling
,
86 size_t local_symbol_count
,
87 const unsigned char* plocal_symbols
);
89 // Scan the relocations to look for symbol adjustments.
91 scan_relocs(Symbol_table
* symtab
,
93 Sized_relobj
<64, false>* object
,
94 unsigned int data_shndx
,
96 const unsigned char* prelocs
,
98 Output_section
* output_section
,
99 bool needs_special_offset_handling
,
100 size_t local_symbol_count
,
101 const unsigned char* plocal_symbols
);
103 // Finalize the sections.
105 do_finalize_sections(Layout
*, const Input_objects
*);
107 // Return the value to use for a dynamic which requires special
110 do_dynsym_value(const Symbol
*) const;
112 // Relocate a section.
114 relocate_section(const Relocate_info
<64, false>*,
115 unsigned int sh_type
,
116 const unsigned char* prelocs
,
118 Output_section
* output_section
,
119 bool needs_special_offset_handling
,
121 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
122 section_size_type view_size
,
123 const Reloc_symbol_changes
*);
125 // Scan the relocs during a relocatable link.
127 scan_relocatable_relocs(Symbol_table
* symtab
,
129 Sized_relobj
<64, false>* object
,
130 unsigned int data_shndx
,
131 unsigned int sh_type
,
132 const unsigned char* prelocs
,
134 Output_section
* output_section
,
135 bool needs_special_offset_handling
,
136 size_t local_symbol_count
,
137 const unsigned char* plocal_symbols
,
138 Relocatable_relocs
*);
140 // Relocate a section during a relocatable link.
142 relocate_for_relocatable(const Relocate_info
<64, false>*,
143 unsigned int sh_type
,
144 const unsigned char* prelocs
,
146 Output_section
* output_section
,
147 off_t offset_in_output_section
,
148 const Relocatable_relocs
*,
150 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
151 section_size_type view_size
,
152 unsigned char* reloc_view
,
153 section_size_type reloc_view_size
);
155 // Return a string used to fill a code section with nops.
157 do_code_fill(section_size_type length
) const;
159 // Return whether SYM is defined by the ABI.
161 do_is_defined_by_abi(const Symbol
* sym
) const
162 { return strcmp(sym
->name(), "__tls_get_addr") == 0; }
164 // Adjust -fstack-split code which calls non-stack-split code.
166 do_calls_non_split(Relobj
* object
, unsigned int shndx
,
167 section_offset_type fnoffset
, section_size_type fnsize
,
168 unsigned char* view
, section_size_type view_size
,
169 std::string
* from
, std::string
* to
) const;
171 // Return the size of the GOT section.
175 gold_assert(this->got_
!= NULL
);
176 return this->got_
->data_size();
180 // The class which scans relocations.
185 : issued_non_pic_error_(false)
189 local(Symbol_table
* symtab
, Layout
* layout
, Target_x86_64
* target
,
190 Sized_relobj
<64, false>* object
,
191 unsigned int data_shndx
,
192 Output_section
* output_section
,
193 const elfcpp::Rela
<64, false>& reloc
, unsigned int r_type
,
194 const elfcpp::Sym
<64, false>& lsym
);
197 global(Symbol_table
* symtab
, Layout
* layout
, Target_x86_64
* target
,
198 Sized_relobj
<64, false>* object
,
199 unsigned int data_shndx
,
200 Output_section
* output_section
,
201 const elfcpp::Rela
<64, false>& reloc
, unsigned int r_type
,
206 unsupported_reloc_local(Sized_relobj
<64, false>*, unsigned int r_type
);
209 unsupported_reloc_global(Sized_relobj
<64, false>*, unsigned int r_type
,
213 check_non_pic(Relobj
*, unsigned int r_type
);
215 // Whether we have issued an error about a non-PIC compilation.
216 bool issued_non_pic_error_
;
219 // The class which implements relocation.
224 : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false)
229 if (this->skip_call_tls_get_addr_
)
231 // FIXME: This needs to specify the location somehow.
232 gold_error(_("missing expected TLS relocation"));
236 // Do a relocation. Return false if the caller should not issue
237 // any warnings about this relocation.
239 relocate(const Relocate_info
<64, false>*, Target_x86_64
*, Output_section
*,
240 size_t relnum
, const elfcpp::Rela
<64, false>&,
241 unsigned int r_type
, const Sized_symbol
<64>*,
242 const Symbol_value
<64>*,
243 unsigned char*, elfcpp::Elf_types
<64>::Elf_Addr
,
247 // Do a TLS relocation.
249 relocate_tls(const Relocate_info
<64, false>*, Target_x86_64
*,
250 size_t relnum
, const elfcpp::Rela
<64, false>&,
251 unsigned int r_type
, const Sized_symbol
<64>*,
252 const Symbol_value
<64>*,
253 unsigned char*, elfcpp::Elf_types
<64>::Elf_Addr
,
256 // Do a TLS General-Dynamic to Initial-Exec transition.
258 tls_gd_to_ie(const Relocate_info
<64, false>*, size_t relnum
,
259 Output_segment
* tls_segment
,
260 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
261 elfcpp::Elf_types
<64>::Elf_Addr value
,
263 elfcpp::Elf_types
<64>::Elf_Addr
,
264 section_size_type view_size
);
266 // Do a TLS General-Dynamic to Local-Exec transition.
268 tls_gd_to_le(const Relocate_info
<64, false>*, size_t relnum
,
269 Output_segment
* tls_segment
,
270 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
271 elfcpp::Elf_types
<64>::Elf_Addr value
,
273 section_size_type view_size
);
275 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
277 tls_desc_gd_to_ie(const Relocate_info
<64, false>*, size_t relnum
,
278 Output_segment
* tls_segment
,
279 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
280 elfcpp::Elf_types
<64>::Elf_Addr value
,
282 elfcpp::Elf_types
<64>::Elf_Addr
,
283 section_size_type view_size
);
285 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
287 tls_desc_gd_to_le(const Relocate_info
<64, false>*, size_t relnum
,
288 Output_segment
* tls_segment
,
289 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
290 elfcpp::Elf_types
<64>::Elf_Addr value
,
292 section_size_type view_size
);
294 // Do a TLS Local-Dynamic to Local-Exec transition.
296 tls_ld_to_le(const Relocate_info
<64, false>*, size_t relnum
,
297 Output_segment
* tls_segment
,
298 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
299 elfcpp::Elf_types
<64>::Elf_Addr value
,
301 section_size_type view_size
);
303 // Do a TLS Initial-Exec to Local-Exec transition.
305 tls_ie_to_le(const Relocate_info
<64, false>*, size_t relnum
,
306 Output_segment
* tls_segment
,
307 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
308 elfcpp::Elf_types
<64>::Elf_Addr value
,
310 section_size_type view_size
);
312 // This is set if we should skip the next reloc, which should be a
313 // PLT32 reloc against ___tls_get_addr.
314 bool skip_call_tls_get_addr_
;
316 // This is set if we see a relocation which could load the address
317 // of the TLS block. Whether we see such a relocation determines
318 // how we handle the R_X86_64_DTPOFF32 relocation, which is used
319 // in debugging sections.
320 bool saw_tls_block_reloc_
;
323 // A class which returns the size required for a relocation type,
324 // used while scanning relocs during a relocatable link.
325 class Relocatable_size_for_reloc
329 get_size_for_reloc(unsigned int, Relobj
*);
332 // Adjust TLS relocation type based on the options and whether this
333 // is a local symbol.
334 static tls::Tls_optimization
335 optimize_tls_reloc(bool is_final
, int r_type
);
337 // Get the GOT section, creating it if necessary.
338 Output_data_got
<64, false>*
339 got_section(Symbol_table
*, Layout
*);
341 // Get the GOT PLT section.
343 got_plt_section() const
345 gold_assert(this->got_plt_
!= NULL
);
346 return this->got_plt_
;
349 // Create the PLT section.
351 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
353 // Create a PLT entry for a global symbol.
355 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
357 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
359 define_tls_base_symbol(Symbol_table
*, Layout
*);
361 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
363 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
365 // Create a GOT entry for the TLS module index.
367 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
368 Sized_relobj
<64, false>* object
);
370 // Get the PLT section.
371 Output_data_plt_x86_64
*
374 gold_assert(this->plt_
!= NULL
);
378 // Get the dynamic reloc section, creating it if necessary.
380 rela_dyn_section(Layout
*);
382 // Add a potential copy relocation.
384 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
385 Sized_relobj
<64, false>* object
,
386 unsigned int shndx
, Output_section
* output_section
,
387 Symbol
* sym
, const elfcpp::Rela
<64, false>& reloc
)
389 this->copy_relocs_
.copy_reloc(symtab
, layout
,
390 symtab
->get_sized_symbol
<64>(sym
),
391 object
, shndx
, output_section
,
392 reloc
, this->rela_dyn_section(layout
));
395 // Information about this specific target which we pass to the
396 // general Target structure.
397 static const Target::Target_info x86_64_info
;
401 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
402 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
403 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
404 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
408 Output_data_got
<64, false>* got_
;
410 Output_data_plt_x86_64
* plt_
;
411 // The GOT PLT section.
412 Output_data_space
* got_plt_
;
413 // The dynamic reloc section.
414 Reloc_section
* rela_dyn_
;
415 // Relocs saved to avoid a COPY reloc.
416 Copy_relocs
<elfcpp::SHT_RELA
, 64, false> copy_relocs_
;
417 // Space for variables copied with a COPY reloc.
418 Output_data_space
* dynbss_
;
419 // Offset of the GOT entry for the TLS module index.
420 unsigned int got_mod_index_offset_
;
421 // True if the _TLS_MODULE_BASE_ symbol has been defined.
422 bool tls_base_symbol_defined_
;
425 const Target::Target_info
Target_x86_64::x86_64_info
=
428 false, // is_big_endian
429 elfcpp::EM_X86_64
, // machine_code
430 false, // has_make_symbol
431 false, // has_resolve
432 true, // has_code_fill
433 true, // is_default_stack_executable
435 "/lib/ld64.so.1", // program interpreter
436 0x400000, // default_text_segment_address
437 0x1000, // abi_pagesize (overridable by -z max-page-size)
438 0x1000, // common_pagesize (overridable by -z common-page-size)
439 elfcpp::SHN_UNDEF
, // small_common_shndx
440 elfcpp::SHN_X86_64_LCOMMON
, // large_common_shndx
441 0, // small_common_section_flags
442 elfcpp::SHF_X86_64_LARGE
// large_common_section_flags
445 // This is called when a new output section is created. This is where
446 // we handle the SHF_X86_64_LARGE.
449 Target_x86_64::do_new_output_section(Output_section
*os
) const
451 if ((os
->flags() & elfcpp::SHF_X86_64_LARGE
) != 0)
452 os
->set_is_large_section();
455 // Get the GOT section, creating it if necessary.
457 Output_data_got
<64, false>*
458 Target_x86_64::got_section(Symbol_table
* symtab
, Layout
* layout
)
460 if (this->got_
== NULL
)
462 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
464 this->got_
= new Output_data_got
<64, false>();
467 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
469 | elfcpp::SHF_WRITE
),
473 // The old GNU linker creates a .got.plt section. We just
474 // create another set of data in the .got section. Note that we
475 // always create a PLT if we create a GOT, although the PLT
477 this->got_plt_
= new Output_data_space(8, "** GOT PLT");
478 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
480 | elfcpp::SHF_WRITE
),
481 this->got_plt_
, false);
484 // The first three entries are reserved.
485 this->got_plt_
->set_current_data_size(3 * 8);
487 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
488 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
490 0, 0, elfcpp::STT_OBJECT
,
492 elfcpp::STV_HIDDEN
, 0,
499 // Get the dynamic reloc section, creating it if necessary.
501 Target_x86_64::Reloc_section
*
502 Target_x86_64::rela_dyn_section(Layout
* layout
)
504 if (this->rela_dyn_
== NULL
)
506 gold_assert(layout
!= NULL
);
507 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
508 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
509 elfcpp::SHF_ALLOC
, this->rela_dyn_
, true);
511 return this->rela_dyn_
;
514 // A class to handle the PLT data.
516 class Output_data_plt_x86_64
: public Output_section_data
519 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false> Reloc_section
;
521 Output_data_plt_x86_64(Layout
*, Output_data_got
<64, false>*,
524 // Add an entry to the PLT.
526 add_entry(Symbol
* gsym
);
528 // Add the reserved TLSDESC_PLT entry to the PLT.
530 reserve_tlsdesc_entry(unsigned int got_offset
)
531 { this->tlsdesc_got_offset_
= got_offset
; }
533 // Return true if a TLSDESC_PLT entry has been reserved.
535 has_tlsdesc_entry() const
536 { return this->tlsdesc_got_offset_
!= -1U; }
538 // Return the GOT offset for the reserved TLSDESC_PLT entry.
540 get_tlsdesc_got_offset() const
541 { return this->tlsdesc_got_offset_
; }
543 // Return the offset of the reserved TLSDESC_PLT entry.
545 get_tlsdesc_plt_offset() const
546 { return (this->count_
+ 1) * plt_entry_size
; }
548 // Return the .rel.plt section data.
551 { return this->rel_
; }
555 do_adjust_output_section(Output_section
* os
);
557 // Write to a map file.
559 do_print_to_mapfile(Mapfile
* mapfile
) const
560 { mapfile
->print_output_data(this, _("** PLT")); }
563 // The size of an entry in the PLT.
564 static const int plt_entry_size
= 16;
566 // The first entry in the PLT.
567 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
568 // procedure linkage table for both programs and shared objects."
569 static unsigned char first_plt_entry
[plt_entry_size
];
571 // Other entries in the PLT for an executable.
572 static unsigned char plt_entry
[plt_entry_size
];
574 // The reserved TLSDESC entry in the PLT for an executable.
575 static unsigned char tlsdesc_plt_entry
[plt_entry_size
];
577 // Set the final size.
579 set_final_data_size();
581 // Write out the PLT data.
583 do_write(Output_file
*);
585 // The reloc section.
588 Output_data_got
<64, false>* got_
;
589 // The .got.plt section.
590 Output_data_space
* got_plt_
;
591 // The number of PLT entries.
593 // Offset of the reserved TLSDESC_GOT entry when needed.
594 unsigned int tlsdesc_got_offset_
;
597 // Create the PLT section. The ordinary .got section is an argument,
598 // since we need to refer to the start. We also create our own .got
599 // section just for PLT entries.
601 Output_data_plt_x86_64::Output_data_plt_x86_64(Layout
* layout
,
602 Output_data_got
<64, false>* got
,
603 Output_data_space
* got_plt
)
604 : Output_section_data(8), got_(got
), got_plt_(got_plt
), count_(0),
605 tlsdesc_got_offset_(-1U)
607 this->rel_
= new Reloc_section(false);
608 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
609 elfcpp::SHF_ALLOC
, this->rel_
, true);
613 Output_data_plt_x86_64::do_adjust_output_section(Output_section
* os
)
615 os
->set_entsize(plt_entry_size
);
618 // Add an entry to the PLT.
621 Output_data_plt_x86_64::add_entry(Symbol
* gsym
)
623 gold_assert(!gsym
->has_plt_offset());
625 // Note that when setting the PLT offset we skip the initial
626 // reserved PLT entry.
627 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
631 section_offset_type got_offset
= this->got_plt_
->current_data_size();
633 // Every PLT entry needs a GOT entry which points back to the PLT
634 // entry (this will be changed by the dynamic linker, normally
635 // lazily when the function is called).
636 this->got_plt_
->set_current_data_size(got_offset
+ 8);
638 // Every PLT entry needs a reloc.
639 gsym
->set_needs_dynsym_entry();
640 this->rel_
->add_global(gsym
, elfcpp::R_X86_64_JUMP_SLOT
, this->got_plt_
,
643 // Note that we don't need to save the symbol. The contents of the
644 // PLT are independent of which symbols are used. The symbols only
645 // appear in the relocations.
648 // Set the final size.
650 Output_data_plt_x86_64::set_final_data_size()
652 unsigned int count
= this->count_
;
653 if (this->has_tlsdesc_entry())
655 this->set_data_size((count
+ 1) * plt_entry_size
);
658 // The first entry in the PLT for an executable.
660 unsigned char Output_data_plt_x86_64::first_plt_entry
[plt_entry_size
] =
662 // From AMD64 ABI Draft 0.98, page 76
663 0xff, 0x35, // pushq contents of memory address
664 0, 0, 0, 0, // replaced with address of .got + 8
665 0xff, 0x25, // jmp indirect
666 0, 0, 0, 0, // replaced with address of .got + 16
667 0x90, 0x90, 0x90, 0x90 // noop (x4)
670 // Subsequent entries in the PLT for an executable.
672 unsigned char Output_data_plt_x86_64::plt_entry
[plt_entry_size
] =
674 // From AMD64 ABI Draft 0.98, page 76
675 0xff, 0x25, // jmpq indirect
676 0, 0, 0, 0, // replaced with address of symbol in .got
677 0x68, // pushq immediate
678 0, 0, 0, 0, // replaced with offset into relocation table
679 0xe9, // jmpq relative
680 0, 0, 0, 0 // replaced with offset to start of .plt
683 // The reserved TLSDESC entry in the PLT for an executable.
685 unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry
[plt_entry_size
] =
687 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
688 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
689 0xff, 0x35, // pushq x(%rip)
690 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
691 0xff, 0x25, // jmpq *y(%rip)
692 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
697 // Write out the PLT. This uses the hand-coded instructions above,
698 // and adjusts them as needed. This is specified by the AMD64 ABI.
701 Output_data_plt_x86_64::do_write(Output_file
* of
)
703 const off_t offset
= this->offset();
704 const section_size_type oview_size
=
705 convert_to_section_size_type(this->data_size());
706 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
708 const off_t got_file_offset
= this->got_plt_
->offset();
709 const section_size_type got_size
=
710 convert_to_section_size_type(this->got_plt_
->data_size());
711 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
714 unsigned char* pov
= oview
;
716 // The base address of the .plt section.
717 elfcpp::Elf_types
<64>::Elf_Addr plt_address
= this->address();
718 // The base address of the .got section.
719 elfcpp::Elf_types
<64>::Elf_Addr got_base
= this->got_
->address();
720 // The base address of the PLT portion of the .got section,
721 // which is where the GOT pointer will point, and where the
722 // three reserved GOT entries are located.
723 elfcpp::Elf_types
<64>::Elf_Addr got_address
= this->got_plt_
->address();
725 memcpy(pov
, first_plt_entry
, plt_entry_size
);
726 // We do a jmp relative to the PC at the end of this instruction.
727 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
729 - (plt_address
+ 6)));
730 elfcpp::Swap
<32, false>::writeval(pov
+ 8,
732 - (plt_address
+ 12)));
733 pov
+= plt_entry_size
;
735 unsigned char* got_pov
= got_view
;
737 memset(got_pov
, 0, 24);
740 unsigned int plt_offset
= plt_entry_size
;
741 unsigned int got_offset
= 24;
742 const unsigned int count
= this->count_
;
743 for (unsigned int plt_index
= 0;
746 pov
+= plt_entry_size
,
748 plt_offset
+= plt_entry_size
,
751 // Set and adjust the PLT entry itself.
752 memcpy(pov
, plt_entry
, plt_entry_size
);
753 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
754 (got_address
+ got_offset
755 - (plt_address
+ plt_offset
758 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_index
);
759 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
760 - (plt_offset
+ plt_entry_size
));
762 // Set the entry in the GOT.
763 elfcpp::Swap
<64, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
766 if (this->has_tlsdesc_entry())
768 // Set and adjust the reserved TLSDESC PLT entry.
769 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
770 memcpy(pov
, tlsdesc_plt_entry
, plt_entry_size
);
771 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
773 - (plt_address
+ plt_offset
775 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 8,
778 - (plt_address
+ plt_offset
780 pov
+= plt_entry_size
;
783 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
784 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
786 of
->write_output_view(offset
, oview_size
, oview
);
787 of
->write_output_view(got_file_offset
, got_size
, got_view
);
790 // Create the PLT section.
793 Target_x86_64::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
795 if (this->plt_
== NULL
)
797 // Create the GOT sections first.
798 this->got_section(symtab
, layout
);
800 this->plt_
= new Output_data_plt_x86_64(layout
, this->got_
,
802 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
804 | elfcpp::SHF_EXECINSTR
),
809 // Create a PLT entry for a global symbol.
812 Target_x86_64::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
815 if (gsym
->has_plt_offset())
818 if (this->plt_
== NULL
)
819 this->make_plt_section(symtab
, layout
);
821 this->plt_
->add_entry(gsym
);
824 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
827 Target_x86_64::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
829 if (this->tls_base_symbol_defined_
)
832 Output_segment
* tls_segment
= layout
->tls_segment();
833 if (tls_segment
!= NULL
)
835 bool is_exec
= parameters
->options().output_is_executable();
836 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
840 elfcpp::STV_HIDDEN
, 0,
842 ? Symbol::SEGMENT_END
843 : Symbol::SEGMENT_START
),
846 this->tls_base_symbol_defined_
= true;
849 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
852 Target_x86_64::reserve_tlsdesc_entries(Symbol_table
* symtab
,
855 if (this->plt_
== NULL
)
856 this->make_plt_section(symtab
, layout
);
858 if (!this->plt_
->has_tlsdesc_entry())
860 // Allocate the TLSDESC_GOT entry.
861 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
862 unsigned int got_offset
= got
->add_constant(0);
864 // Allocate the TLSDESC_PLT entry.
865 this->plt_
->reserve_tlsdesc_entry(got_offset
);
869 // Create a GOT entry for the TLS module index.
872 Target_x86_64::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
873 Sized_relobj
<64, false>* object
)
875 if (this->got_mod_index_offset_
== -1U)
877 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
878 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
879 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
880 unsigned int got_offset
= got
->add_constant(0);
881 rela_dyn
->add_local(object
, 0, elfcpp::R_X86_64_DTPMOD64
, got
,
883 got
->add_constant(0);
884 this->got_mod_index_offset_
= got_offset
;
886 return this->got_mod_index_offset_
;
889 // Optimize the TLS relocation type based on what we know about the
890 // symbol. IS_FINAL is true if the final address of this symbol is
891 // known at link time.
893 tls::Tls_optimization
894 Target_x86_64::optimize_tls_reloc(bool is_final
, int r_type
)
896 // If we are generating a shared library, then we can't do anything
898 if (parameters
->options().shared())
899 return tls::TLSOPT_NONE
;
903 case elfcpp::R_X86_64_TLSGD
:
904 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
905 case elfcpp::R_X86_64_TLSDESC_CALL
:
906 // These are General-Dynamic which permits fully general TLS
907 // access. Since we know that we are generating an executable,
908 // we can convert this to Initial-Exec. If we also know that
909 // this is a local symbol, we can further switch to Local-Exec.
911 return tls::TLSOPT_TO_LE
;
912 return tls::TLSOPT_TO_IE
;
914 case elfcpp::R_X86_64_TLSLD
:
915 // This is Local-Dynamic, which refers to a local symbol in the
916 // dynamic TLS block. Since we know that we generating an
917 // executable, we can switch to Local-Exec.
918 return tls::TLSOPT_TO_LE
;
920 case elfcpp::R_X86_64_DTPOFF32
:
921 case elfcpp::R_X86_64_DTPOFF64
:
922 // Another Local-Dynamic reloc.
923 return tls::TLSOPT_TO_LE
;
925 case elfcpp::R_X86_64_GOTTPOFF
:
926 // These are Initial-Exec relocs which get the thread offset
927 // from the GOT. If we know that we are linking against the
928 // local symbol, we can switch to Local-Exec, which links the
929 // thread offset into the instruction.
931 return tls::TLSOPT_TO_LE
;
932 return tls::TLSOPT_NONE
;
934 case elfcpp::R_X86_64_TPOFF32
:
935 // When we already have Local-Exec, there is nothing further we
937 return tls::TLSOPT_NONE
;
944 // Report an unsupported relocation against a local symbol.
947 Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj
<64, false>* object
,
950 gold_error(_("%s: unsupported reloc %u against local symbol"),
951 object
->name().c_str(), r_type
);
954 // We are about to emit a dynamic relocation of type R_TYPE. If the
955 // dynamic linker does not support it, issue an error. The GNU linker
956 // only issues a non-PIC error for an allocated read-only section.
957 // Here we know the section is allocated, but we don't know that it is
958 // read-only. But we check for all the relocation types which the
959 // glibc dynamic linker supports, so it seems appropriate to issue an
960 // error even if the section is not read-only.
963 Target_x86_64::Scan::check_non_pic(Relobj
* object
, unsigned int r_type
)
967 // These are the relocation types supported by glibc for x86_64.
968 case elfcpp::R_X86_64_RELATIVE
:
969 case elfcpp::R_X86_64_GLOB_DAT
:
970 case elfcpp::R_X86_64_JUMP_SLOT
:
971 case elfcpp::R_X86_64_DTPMOD64
:
972 case elfcpp::R_X86_64_DTPOFF64
:
973 case elfcpp::R_X86_64_TPOFF64
:
974 case elfcpp::R_X86_64_64
:
975 case elfcpp::R_X86_64_32
:
976 case elfcpp::R_X86_64_PC32
:
977 case elfcpp::R_X86_64_COPY
:
981 // This prevents us from issuing more than one error per reloc
982 // section. But we can still wind up issuing more than one
983 // error per object file.
984 if (this->issued_non_pic_error_
)
986 gold_assert(parameters
->options().output_is_position_independent());
987 object
->error(_("requires unsupported dynamic reloc; "
988 "recompile with -fPIC"));
989 this->issued_non_pic_error_
= true;
992 case elfcpp::R_X86_64_NONE
:
997 // Scan a relocation for a local symbol.
1000 Target_x86_64::Scan::local(Symbol_table
* symtab
,
1002 Target_x86_64
* target
,
1003 Sized_relobj
<64, false>* object
,
1004 unsigned int data_shndx
,
1005 Output_section
* output_section
,
1006 const elfcpp::Rela
<64, false>& reloc
,
1007 unsigned int r_type
,
1008 const elfcpp::Sym
<64, false>& lsym
)
1012 case elfcpp::R_X86_64_NONE
:
1013 case elfcpp::R_386_GNU_VTINHERIT
:
1014 case elfcpp::R_386_GNU_VTENTRY
:
1017 case elfcpp::R_X86_64_64
:
1018 // If building a shared library (or a position-independent
1019 // executable), we need to create a dynamic relocation for this
1020 // location. The relocation applied at link time will apply the
1021 // link-time value, so we flag the location with an
1022 // R_X86_64_RELATIVE relocation so the dynamic loader can
1023 // relocate it easily.
1024 if (parameters
->options().output_is_position_independent())
1026 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1027 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1028 rela_dyn
->add_local_relative(object
, r_sym
,
1029 elfcpp::R_X86_64_RELATIVE
,
1030 output_section
, data_shndx
,
1031 reloc
.get_r_offset(),
1032 reloc
.get_r_addend());
1036 case elfcpp::R_X86_64_32
:
1037 case elfcpp::R_X86_64_32S
:
1038 case elfcpp::R_X86_64_16
:
1039 case elfcpp::R_X86_64_8
:
1040 // If building a shared library (or a position-independent
1041 // executable), we need to create a dynamic relocation for this
1042 // location. We can't use an R_X86_64_RELATIVE relocation
1043 // because that is always a 64-bit relocation.
1044 if (parameters
->options().output_is_position_independent())
1046 this->check_non_pic(object
, r_type
);
1048 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1049 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1050 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
1051 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
1052 data_shndx
, reloc
.get_r_offset(),
1053 reloc
.get_r_addend());
1056 gold_assert(lsym
.get_st_value() == 0);
1057 unsigned int shndx
= lsym
.get_st_shndx();
1059 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
1062 object
->error(_("section symbol %u has bad shndx %u"),
1065 rela_dyn
->add_local_section(object
, shndx
,
1066 r_type
, output_section
,
1067 data_shndx
, reloc
.get_r_offset(),
1068 reloc
.get_r_addend());
1073 case elfcpp::R_X86_64_PC64
:
1074 case elfcpp::R_X86_64_PC32
:
1075 case elfcpp::R_X86_64_PC16
:
1076 case elfcpp::R_X86_64_PC8
:
1079 case elfcpp::R_X86_64_PLT32
:
1080 // Since we know this is a local symbol, we can handle this as a
1084 case elfcpp::R_X86_64_GOTPC32
:
1085 case elfcpp::R_X86_64_GOTOFF64
:
1086 case elfcpp::R_X86_64_GOTPC64
:
1087 case elfcpp::R_X86_64_PLTOFF64
:
1088 // We need a GOT section.
1089 target
->got_section(symtab
, layout
);
1090 // For PLTOFF64, we'd normally want a PLT section, but since we
1091 // know this is a local symbol, no PLT is needed.
1094 case elfcpp::R_X86_64_GOT64
:
1095 case elfcpp::R_X86_64_GOT32
:
1096 case elfcpp::R_X86_64_GOTPCREL64
:
1097 case elfcpp::R_X86_64_GOTPCREL
:
1098 case elfcpp::R_X86_64_GOTPLT64
:
1100 // The symbol requires a GOT entry.
1101 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1102 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1103 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
1105 // If we are generating a shared object, we need to add a
1106 // dynamic relocation for this symbol's GOT entry.
1107 if (parameters
->options().output_is_position_independent())
1109 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1110 // R_X86_64_RELATIVE assumes a 64-bit relocation.
1111 if (r_type
!= elfcpp::R_X86_64_GOT32
)
1112 rela_dyn
->add_local_relative(
1113 object
, r_sym
, elfcpp::R_X86_64_RELATIVE
, got
,
1114 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
1117 this->check_non_pic(object
, r_type
);
1119 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1120 rela_dyn
->add_local(
1121 object
, r_sym
, r_type
, got
,
1122 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
1126 // For GOTPLT64, we'd normally want a PLT section, but since
1127 // we know this is a local symbol, no PLT is needed.
1131 case elfcpp::R_X86_64_COPY
:
1132 case elfcpp::R_X86_64_GLOB_DAT
:
1133 case elfcpp::R_X86_64_JUMP_SLOT
:
1134 case elfcpp::R_X86_64_RELATIVE
:
1135 // These are outstanding tls relocs, which are unexpected when linking
1136 case elfcpp::R_X86_64_TPOFF64
:
1137 case elfcpp::R_X86_64_DTPMOD64
:
1138 case elfcpp::R_X86_64_TLSDESC
:
1139 gold_error(_("%s: unexpected reloc %u in object file"),
1140 object
->name().c_str(), r_type
);
1143 // These are initial tls relocs, which are expected when linking
1144 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1145 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1146 case elfcpp::R_X86_64_TLSDESC_CALL
:
1147 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1148 case elfcpp::R_X86_64_DTPOFF32
:
1149 case elfcpp::R_X86_64_DTPOFF64
:
1150 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1151 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1153 bool output_is_shared
= parameters
->options().shared();
1154 const tls::Tls_optimization optimized_type
1155 = Target_x86_64::optimize_tls_reloc(!output_is_shared
, r_type
);
1158 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1159 if (optimized_type
== tls::TLSOPT_NONE
)
1161 // Create a pair of GOT entries for the module index and
1162 // dtv-relative offset.
1163 Output_data_got
<64, false>* got
1164 = target
->got_section(symtab
, layout
);
1165 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1166 unsigned int shndx
= lsym
.get_st_shndx();
1168 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1170 object
->error(_("local symbol %u has bad shndx %u"),
1173 got
->add_local_pair_with_rela(object
, r_sym
,
1176 target
->rela_dyn_section(layout
),
1177 elfcpp::R_X86_64_DTPMOD64
, 0);
1179 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1180 unsupported_reloc_local(object
, r_type
);
1183 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1184 target
->define_tls_base_symbol(symtab
, layout
);
1185 if (optimized_type
== tls::TLSOPT_NONE
)
1187 // Create reserved PLT and GOT entries for the resolver.
1188 target
->reserve_tlsdesc_entries(symtab
, layout
);
1190 // Generate a double GOT entry with an R_X86_64_TLSDESC reloc.
1191 Output_data_got
<64, false>* got
1192 = target
->got_section(symtab
, layout
);
1193 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1194 unsigned int shndx
= lsym
.get_st_shndx();
1196 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1198 object
->error(_("local symbol %u has bad shndx %u"),
1201 got
->add_local_pair_with_rela(object
, r_sym
,
1204 target
->rela_dyn_section(layout
),
1205 elfcpp::R_X86_64_TLSDESC
, 0);
1207 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1208 unsupported_reloc_local(object
, r_type
);
1211 case elfcpp::R_X86_64_TLSDESC_CALL
:
1214 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1215 if (optimized_type
== tls::TLSOPT_NONE
)
1217 // Create a GOT entry for the module index.
1218 target
->got_mod_index_entry(symtab
, layout
, object
);
1220 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1221 unsupported_reloc_local(object
, r_type
);
1224 case elfcpp::R_X86_64_DTPOFF32
:
1225 case elfcpp::R_X86_64_DTPOFF64
:
1228 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1229 layout
->set_has_static_tls();
1230 if (optimized_type
== tls::TLSOPT_NONE
)
1232 // Create a GOT entry for the tp-relative offset.
1233 Output_data_got
<64, false>* got
1234 = target
->got_section(symtab
, layout
);
1235 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1236 got
->add_local_with_rela(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
1237 target
->rela_dyn_section(layout
),
1238 elfcpp::R_X86_64_TPOFF64
);
1240 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1241 unsupported_reloc_local(object
, r_type
);
1244 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1245 layout
->set_has_static_tls();
1246 if (output_is_shared
)
1247 unsupported_reloc_local(object
, r_type
);
1256 case elfcpp::R_X86_64_SIZE32
:
1257 case elfcpp::R_X86_64_SIZE64
:
1259 gold_error(_("%s: unsupported reloc %u against local symbol"),
1260 object
->name().c_str(), r_type
);
1266 // Report an unsupported relocation against a global symbol.
1269 Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj
<64, false>* object
,
1270 unsigned int r_type
,
1273 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1274 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1277 // Scan a relocation for a global symbol.
1280 Target_x86_64::Scan::global(Symbol_table
* symtab
,
1282 Target_x86_64
* target
,
1283 Sized_relobj
<64, false>* object
,
1284 unsigned int data_shndx
,
1285 Output_section
* output_section
,
1286 const elfcpp::Rela
<64, false>& reloc
,
1287 unsigned int r_type
,
1292 case elfcpp::R_X86_64_NONE
:
1293 case elfcpp::R_386_GNU_VTINHERIT
:
1294 case elfcpp::R_386_GNU_VTENTRY
:
1297 case elfcpp::R_X86_64_64
:
1298 case elfcpp::R_X86_64_32
:
1299 case elfcpp::R_X86_64_32S
:
1300 case elfcpp::R_X86_64_16
:
1301 case elfcpp::R_X86_64_8
:
1303 // Make a PLT entry if necessary.
1304 if (gsym
->needs_plt_entry())
1306 target
->make_plt_entry(symtab
, layout
, gsym
);
1307 // Since this is not a PC-relative relocation, we may be
1308 // taking the address of a function. In that case we need to
1309 // set the entry in the dynamic symbol table to the address of
1311 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1312 gsym
->set_needs_dynsym_value();
1314 // Make a dynamic relocation if necessary.
1315 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1317 if (gsym
->may_need_copy_reloc())
1319 target
->copy_reloc(symtab
, layout
, object
,
1320 data_shndx
, output_section
, gsym
, reloc
);
1322 else if (r_type
== elfcpp::R_X86_64_64
1323 && gsym
->can_use_relative_reloc(false))
1325 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1326 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_RELATIVE
,
1327 output_section
, object
,
1328 data_shndx
, reloc
.get_r_offset(),
1329 reloc
.get_r_addend());
1333 this->check_non_pic(object
, r_type
);
1334 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1335 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1336 data_shndx
, reloc
.get_r_offset(),
1337 reloc
.get_r_addend());
1343 case elfcpp::R_X86_64_PC64
:
1344 case elfcpp::R_X86_64_PC32
:
1345 case elfcpp::R_X86_64_PC16
:
1346 case elfcpp::R_X86_64_PC8
:
1348 // Make a PLT entry if necessary.
1349 if (gsym
->needs_plt_entry())
1350 target
->make_plt_entry(symtab
, layout
, gsym
);
1351 // Make a dynamic relocation if necessary.
1352 int flags
= Symbol::NON_PIC_REF
;
1353 if (gsym
->type() == elfcpp::STT_FUNC
)
1354 flags
|= Symbol::FUNCTION_CALL
;
1355 if (gsym
->needs_dynamic_reloc(flags
))
1357 if (gsym
->may_need_copy_reloc())
1359 target
->copy_reloc(symtab
, layout
, object
,
1360 data_shndx
, output_section
, gsym
, reloc
);
1364 this->check_non_pic(object
, r_type
);
1365 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1366 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1367 data_shndx
, reloc
.get_r_offset(),
1368 reloc
.get_r_addend());
1374 case elfcpp::R_X86_64_GOT64
:
1375 case elfcpp::R_X86_64_GOT32
:
1376 case elfcpp::R_X86_64_GOTPCREL64
:
1377 case elfcpp::R_X86_64_GOTPCREL
:
1378 case elfcpp::R_X86_64_GOTPLT64
:
1380 // The symbol requires a GOT entry.
1381 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1382 if (gsym
->final_value_is_known())
1383 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1386 // If this symbol is not fully resolved, we need to add a
1387 // dynamic relocation for it.
1388 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1389 if (gsym
->is_from_dynobj()
1390 || gsym
->is_undefined()
1391 || gsym
->is_preemptible())
1392 got
->add_global_with_rela(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
1393 elfcpp::R_X86_64_GLOB_DAT
);
1396 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1397 rela_dyn
->add_global_relative(
1398 gsym
, elfcpp::R_X86_64_RELATIVE
, got
,
1399 gsym
->got_offset(GOT_TYPE_STANDARD
), 0);
1402 // For GOTPLT64, we also need a PLT entry (but only if the
1403 // symbol is not fully resolved).
1404 if (r_type
== elfcpp::R_X86_64_GOTPLT64
1405 && !gsym
->final_value_is_known())
1406 target
->make_plt_entry(symtab
, layout
, gsym
);
1410 case elfcpp::R_X86_64_PLT32
:
1411 // If the symbol is fully resolved, this is just a PC32 reloc.
1412 // Otherwise we need a PLT entry.
1413 if (gsym
->final_value_is_known())
1415 // If building a shared library, we can also skip the PLT entry
1416 // if the symbol is defined in the output file and is protected
1418 if (gsym
->is_defined()
1419 && !gsym
->is_from_dynobj()
1420 && !gsym
->is_preemptible())
1422 target
->make_plt_entry(symtab
, layout
, gsym
);
1425 case elfcpp::R_X86_64_GOTPC32
:
1426 case elfcpp::R_X86_64_GOTOFF64
:
1427 case elfcpp::R_X86_64_GOTPC64
:
1428 case elfcpp::R_X86_64_PLTOFF64
:
1429 // We need a GOT section.
1430 target
->got_section(symtab
, layout
);
1431 // For PLTOFF64, we also need a PLT entry (but only if the
1432 // symbol is not fully resolved).
1433 if (r_type
== elfcpp::R_X86_64_PLTOFF64
1434 && !gsym
->final_value_is_known())
1435 target
->make_plt_entry(symtab
, layout
, gsym
);
1438 case elfcpp::R_X86_64_COPY
:
1439 case elfcpp::R_X86_64_GLOB_DAT
:
1440 case elfcpp::R_X86_64_JUMP_SLOT
:
1441 case elfcpp::R_X86_64_RELATIVE
:
1442 // These are outstanding tls relocs, which are unexpected when linking
1443 case elfcpp::R_X86_64_TPOFF64
:
1444 case elfcpp::R_X86_64_DTPMOD64
:
1445 case elfcpp::R_X86_64_TLSDESC
:
1446 gold_error(_("%s: unexpected reloc %u in object file"),
1447 object
->name().c_str(), r_type
);
1450 // These are initial tls relocs, which are expected for global()
1451 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1452 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1453 case elfcpp::R_X86_64_TLSDESC_CALL
:
1454 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1455 case elfcpp::R_X86_64_DTPOFF32
:
1456 case elfcpp::R_X86_64_DTPOFF64
:
1457 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1458 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1460 const bool is_final
= gsym
->final_value_is_known();
1461 const tls::Tls_optimization optimized_type
1462 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1465 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1466 if (optimized_type
== tls::TLSOPT_NONE
)
1468 // Create a pair of GOT entries for the module index and
1469 // dtv-relative offset.
1470 Output_data_got
<64, false>* got
1471 = target
->got_section(symtab
, layout
);
1472 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_PAIR
,
1473 target
->rela_dyn_section(layout
),
1474 elfcpp::R_X86_64_DTPMOD64
,
1475 elfcpp::R_X86_64_DTPOFF64
);
1477 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1479 // Create a GOT entry for the tp-relative offset.
1480 Output_data_got
<64, false>* got
1481 = target
->got_section(symtab
, layout
);
1482 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1483 target
->rela_dyn_section(layout
),
1484 elfcpp::R_X86_64_TPOFF64
);
1486 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1487 unsupported_reloc_global(object
, r_type
, gsym
);
1490 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1491 target
->define_tls_base_symbol(symtab
, layout
);
1492 if (optimized_type
== tls::TLSOPT_NONE
)
1494 // Create reserved PLT and GOT entries for the resolver.
1495 target
->reserve_tlsdesc_entries(symtab
, layout
);
1497 // Create a double GOT entry with an R_X86_64_TLSDESC reloc.
1498 Output_data_got
<64, false>* got
1499 = target
->got_section(symtab
, layout
);
1500 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_DESC
,
1501 target
->rela_dyn_section(layout
),
1502 elfcpp::R_X86_64_TLSDESC
, 0);
1504 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1506 // Create a GOT entry for the tp-relative offset.
1507 Output_data_got
<64, false>* got
1508 = target
->got_section(symtab
, layout
);
1509 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1510 target
->rela_dyn_section(layout
),
1511 elfcpp::R_X86_64_TPOFF64
);
1513 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1514 unsupported_reloc_global(object
, r_type
, gsym
);
1517 case elfcpp::R_X86_64_TLSDESC_CALL
:
1520 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1521 if (optimized_type
== tls::TLSOPT_NONE
)
1523 // Create a GOT entry for the module index.
1524 target
->got_mod_index_entry(symtab
, layout
, object
);
1526 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1527 unsupported_reloc_global(object
, r_type
, gsym
);
1530 case elfcpp::R_X86_64_DTPOFF32
:
1531 case elfcpp::R_X86_64_DTPOFF64
:
1534 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1535 layout
->set_has_static_tls();
1536 if (optimized_type
== tls::TLSOPT_NONE
)
1538 // Create a GOT entry for the tp-relative offset.
1539 Output_data_got
<64, false>* got
1540 = target
->got_section(symtab
, layout
);
1541 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1542 target
->rela_dyn_section(layout
),
1543 elfcpp::R_X86_64_TPOFF64
);
1545 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1546 unsupported_reloc_global(object
, r_type
, gsym
);
1549 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1550 layout
->set_has_static_tls();
1551 if (parameters
->options().shared())
1552 unsupported_reloc_local(object
, r_type
);
1561 case elfcpp::R_X86_64_SIZE32
:
1562 case elfcpp::R_X86_64_SIZE64
:
1564 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1565 object
->name().c_str(), r_type
,
1566 gsym
->demangled_name().c_str());
1572 Target_x86_64::gc_process_relocs(Symbol_table
* symtab
,
1574 Sized_relobj
<64, false>* object
,
1575 unsigned int data_shndx
,
1576 unsigned int sh_type
,
1577 const unsigned char* prelocs
,
1579 Output_section
* output_section
,
1580 bool needs_special_offset_handling
,
1581 size_t local_symbol_count
,
1582 const unsigned char* plocal_symbols
)
1585 if (sh_type
== elfcpp::SHT_REL
)
1590 gold::gc_process_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1591 Target_x86_64::Scan
>(
1600 needs_special_offset_handling
,
1605 // Scan relocations for a section.
1608 Target_x86_64::scan_relocs(Symbol_table
* symtab
,
1610 Sized_relobj
<64, false>* object
,
1611 unsigned int data_shndx
,
1612 unsigned int sh_type
,
1613 const unsigned char* prelocs
,
1615 Output_section
* output_section
,
1616 bool needs_special_offset_handling
,
1617 size_t local_symbol_count
,
1618 const unsigned char* plocal_symbols
)
1620 if (sh_type
== elfcpp::SHT_REL
)
1622 gold_error(_("%s: unsupported REL reloc section"),
1623 object
->name().c_str());
1627 gold::scan_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1628 Target_x86_64::Scan
>(
1637 needs_special_offset_handling
,
1642 // Finalize the sections.
1645 Target_x86_64::do_finalize_sections(Layout
* layout
, const Input_objects
*)
1647 // Fill in some more dynamic tags.
1648 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1651 if (this->got_plt_
!= NULL
1652 && this->got_plt_
->output_section() != NULL
)
1653 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1655 if (this->plt_
!= NULL
1656 && this->plt_
->output_section() != NULL
)
1658 const Output_data
* od
= this->plt_
->rel_plt();
1659 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1660 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1661 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_RELA
);
1662 if (this->plt_
->has_tlsdesc_entry())
1664 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
1665 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
1666 this->got_
->finalize_data_size();
1667 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
1668 this->plt_
, plt_offset
);
1669 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
1670 this->got_
, got_offset
);
1674 if (this->rela_dyn_
!= NULL
1675 && this->rela_dyn_
->output_section() != NULL
)
1677 const Output_data
* od
= this->rela_dyn_
;
1678 odyn
->add_section_address(elfcpp::DT_RELA
, od
);
1679 odyn
->add_section_size(elfcpp::DT_RELASZ
, od
);
1680 odyn
->add_constant(elfcpp::DT_RELAENT
,
1681 elfcpp::Elf_sizes
<64>::rela_size
);
1684 if (!parameters
->options().shared())
1686 // The value of the DT_DEBUG tag is filled in by the dynamic
1687 // linker at run time, and used by the debugger.
1688 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1692 // Emit any relocs we saved in an attempt to avoid generating COPY
1694 if (this->copy_relocs_
.any_saved_relocs())
1695 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
1698 // Perform a relocation.
1701 Target_x86_64::Relocate::relocate(const Relocate_info
<64, false>* relinfo
,
1702 Target_x86_64
* target
,
1705 const elfcpp::Rela
<64, false>& rela
,
1706 unsigned int r_type
,
1707 const Sized_symbol
<64>* gsym
,
1708 const Symbol_value
<64>* psymval
,
1709 unsigned char* view
,
1710 elfcpp::Elf_types
<64>::Elf_Addr address
,
1711 section_size_type view_size
)
1713 if (this->skip_call_tls_get_addr_
)
1715 if ((r_type
!= elfcpp::R_X86_64_PLT32
1716 && r_type
!= elfcpp::R_X86_64_PC32
)
1718 || strcmp(gsym
->name(), "__tls_get_addr") != 0)
1720 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1721 _("missing expected TLS relocation"));
1725 this->skip_call_tls_get_addr_
= false;
1730 // Pick the value to use for symbols defined in shared objects.
1731 Symbol_value
<64> symval
;
1733 && gsym
->use_plt_offset(r_type
== elfcpp::R_X86_64_PC64
1734 || r_type
== elfcpp::R_X86_64_PC32
1735 || r_type
== elfcpp::R_X86_64_PC16
1736 || r_type
== elfcpp::R_X86_64_PC8
))
1738 symval
.set_output_value(target
->plt_section()->address()
1739 + gsym
->plt_offset());
1743 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1744 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1746 // Get the GOT offset if needed.
1747 // The GOT pointer points to the end of the GOT section.
1748 // We need to subtract the size of the GOT section to get
1749 // the actual offset to use in the relocation.
1750 bool have_got_offset
= false;
1751 unsigned int got_offset
= 0;
1754 case elfcpp::R_X86_64_GOT32
:
1755 case elfcpp::R_X86_64_GOT64
:
1756 case elfcpp::R_X86_64_GOTPLT64
:
1757 case elfcpp::R_X86_64_GOTPCREL
:
1758 case elfcpp::R_X86_64_GOTPCREL64
:
1761 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1762 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - target
->got_size();
1766 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
1767 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1768 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1769 - target
->got_size());
1771 have_got_offset
= true;
1780 case elfcpp::R_X86_64_NONE
:
1781 case elfcpp::R_386_GNU_VTINHERIT
:
1782 case elfcpp::R_386_GNU_VTENTRY
:
1785 case elfcpp::R_X86_64_64
:
1786 Relocate_functions
<64, false>::rela64(view
, object
, psymval
, addend
);
1789 case elfcpp::R_X86_64_PC64
:
1790 Relocate_functions
<64, false>::pcrela64(view
, object
, psymval
, addend
,
1794 case elfcpp::R_X86_64_32
:
1795 // FIXME: we need to verify that value + addend fits into 32 bits:
1796 // uint64_t x = value + addend;
1797 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
1798 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
1799 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1802 case elfcpp::R_X86_64_32S
:
1803 // FIXME: we need to verify that value + addend fits into 32 bits:
1804 // int64_t x = value + addend; // note this quantity is signed!
1805 // x == static_cast<int64_t>(static_cast<int32_t>(x))
1806 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1809 case elfcpp::R_X86_64_PC32
:
1810 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1814 case elfcpp::R_X86_64_16
:
1815 Relocate_functions
<64, false>::rela16(view
, object
, psymval
, addend
);
1818 case elfcpp::R_X86_64_PC16
:
1819 Relocate_functions
<64, false>::pcrela16(view
, object
, psymval
, addend
,
1823 case elfcpp::R_X86_64_8
:
1824 Relocate_functions
<64, false>::rela8(view
, object
, psymval
, addend
);
1827 case elfcpp::R_X86_64_PC8
:
1828 Relocate_functions
<64, false>::pcrela8(view
, object
, psymval
, addend
,
1832 case elfcpp::R_X86_64_PLT32
:
1833 gold_assert(gsym
== NULL
1834 || gsym
->has_plt_offset()
1835 || gsym
->final_value_is_known()
1836 || (gsym
->is_defined()
1837 && !gsym
->is_from_dynobj()
1838 && !gsym
->is_preemptible()));
1839 // Note: while this code looks the same as for R_X86_64_PC32, it
1840 // behaves differently because psymval was set to point to
1841 // the PLT entry, rather than the symbol, in Scan::global().
1842 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1846 case elfcpp::R_X86_64_PLTOFF64
:
1849 gold_assert(gsym
->has_plt_offset()
1850 || gsym
->final_value_is_known());
1851 elfcpp::Elf_types
<64>::Elf_Addr got_address
;
1852 got_address
= target
->got_section(NULL
, NULL
)->address();
1853 Relocate_functions
<64, false>::rela64(view
, object
, psymval
,
1854 addend
- got_address
);
1857 case elfcpp::R_X86_64_GOT32
:
1858 gold_assert(have_got_offset
);
1859 Relocate_functions
<64, false>::rela32(view
, got_offset
, addend
);
1862 case elfcpp::R_X86_64_GOTPC32
:
1865 elfcpp::Elf_types
<64>::Elf_Addr value
;
1866 value
= target
->got_plt_section()->address();
1867 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1871 case elfcpp::R_X86_64_GOT64
:
1872 // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
1873 // Since we always add a PLT entry, this is equivalent.
1874 case elfcpp::R_X86_64_GOTPLT64
:
1875 gold_assert(have_got_offset
);
1876 Relocate_functions
<64, false>::rela64(view
, got_offset
, addend
);
1879 case elfcpp::R_X86_64_GOTPC64
:
1882 elfcpp::Elf_types
<64>::Elf_Addr value
;
1883 value
= target
->got_plt_section()->address();
1884 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1888 case elfcpp::R_X86_64_GOTOFF64
:
1890 elfcpp::Elf_types
<64>::Elf_Addr value
;
1891 value
= (psymval
->value(object
, 0)
1892 - target
->got_plt_section()->address());
1893 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
1897 case elfcpp::R_X86_64_GOTPCREL
:
1899 gold_assert(have_got_offset
);
1900 elfcpp::Elf_types
<64>::Elf_Addr value
;
1901 value
= target
->got_plt_section()->address() + got_offset
;
1902 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1906 case elfcpp::R_X86_64_GOTPCREL64
:
1908 gold_assert(have_got_offset
);
1909 elfcpp::Elf_types
<64>::Elf_Addr value
;
1910 value
= target
->got_plt_section()->address() + got_offset
;
1911 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1915 case elfcpp::R_X86_64_COPY
:
1916 case elfcpp::R_X86_64_GLOB_DAT
:
1917 case elfcpp::R_X86_64_JUMP_SLOT
:
1918 case elfcpp::R_X86_64_RELATIVE
:
1919 // These are outstanding tls relocs, which are unexpected when linking
1920 case elfcpp::R_X86_64_TPOFF64
:
1921 case elfcpp::R_X86_64_DTPMOD64
:
1922 case elfcpp::R_X86_64_TLSDESC
:
1923 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1924 _("unexpected reloc %u in object file"),
1928 // These are initial tls relocs, which are expected when linking
1929 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1930 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1931 case elfcpp::R_X86_64_TLSDESC_CALL
:
1932 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1933 case elfcpp::R_X86_64_DTPOFF32
:
1934 case elfcpp::R_X86_64_DTPOFF64
:
1935 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1936 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1937 this->relocate_tls(relinfo
, target
, relnum
, rela
, r_type
, gsym
, psymval
,
1938 view
, address
, view_size
);
1941 case elfcpp::R_X86_64_SIZE32
:
1942 case elfcpp::R_X86_64_SIZE64
:
1944 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1945 _("unsupported reloc %u"),
1953 // Perform a TLS relocation.
1956 Target_x86_64::Relocate::relocate_tls(const Relocate_info
<64, false>* relinfo
,
1957 Target_x86_64
* target
,
1959 const elfcpp::Rela
<64, false>& rela
,
1960 unsigned int r_type
,
1961 const Sized_symbol
<64>* gsym
,
1962 const Symbol_value
<64>* psymval
,
1963 unsigned char* view
,
1964 elfcpp::Elf_types
<64>::Elf_Addr address
,
1965 section_size_type view_size
)
1967 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1969 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1970 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1972 elfcpp::Elf_types
<64>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
1974 const bool is_final
= (gsym
== NULL
1975 ? !parameters
->options().output_is_position_independent()
1976 : gsym
->final_value_is_known());
1977 const tls::Tls_optimization optimized_type
1978 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1981 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1982 this->saw_tls_block_reloc_
= true;
1983 if (optimized_type
== tls::TLSOPT_TO_LE
)
1985 gold_assert(tls_segment
!= NULL
);
1986 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1987 rela
, r_type
, value
, view
,
1993 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1994 ? GOT_TYPE_TLS_OFFSET
1995 : GOT_TYPE_TLS_PAIR
);
1996 unsigned int got_offset
;
1999 gold_assert(gsym
->has_got_offset(got_type
));
2000 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2004 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2005 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2006 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2007 - target
->got_size());
2009 if (optimized_type
== tls::TLSOPT_TO_IE
)
2011 gold_assert(tls_segment
!= NULL
);
2012 value
= target
->got_plt_section()->address() + got_offset
;
2013 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rela
, r_type
,
2014 value
, view
, address
, view_size
);
2017 else if (optimized_type
== tls::TLSOPT_NONE
)
2019 // Relocate the field with the offset of the pair of GOT
2021 value
= target
->got_plt_section()->address() + got_offset
;
2022 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2027 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2028 _("unsupported reloc %u"), r_type
);
2031 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2032 case elfcpp::R_X86_64_TLSDESC_CALL
:
2033 this->saw_tls_block_reloc_
= true;
2034 if (optimized_type
== tls::TLSOPT_TO_LE
)
2036 gold_assert(tls_segment
!= NULL
);
2037 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
2038 rela
, r_type
, value
, view
,
2044 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2045 ? GOT_TYPE_TLS_OFFSET
2046 : GOT_TYPE_TLS_DESC
);
2047 unsigned int got_offset
;
2050 gold_assert(gsym
->has_got_offset(got_type
));
2051 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2055 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2056 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2057 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2058 - target
->got_size());
2060 if (optimized_type
== tls::TLSOPT_TO_IE
)
2062 gold_assert(tls_segment
!= NULL
);
2063 value
= target
->got_plt_section()->address() + got_offset
;
2064 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
,
2065 rela
, r_type
, value
, view
, address
,
2069 else if (optimized_type
== tls::TLSOPT_NONE
)
2071 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2073 // Relocate the field with the offset of the pair of GOT
2075 value
= target
->got_plt_section()->address() + got_offset
;
2076 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2082 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2083 _("unsupported reloc %u"), r_type
);
2086 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2087 this->saw_tls_block_reloc_
= true;
2088 if (optimized_type
== tls::TLSOPT_TO_LE
)
2090 gold_assert(tls_segment
!= NULL
);
2091 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rela
, r_type
,
2092 value
, view
, view_size
);
2095 else if (optimized_type
== tls::TLSOPT_NONE
)
2097 // Relocate the field with the offset of the GOT entry for
2098 // the module index.
2099 unsigned int got_offset
;
2100 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2101 - target
->got_size());
2102 value
= target
->got_plt_section()->address() + got_offset
;
2103 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2107 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2108 _("unsupported reloc %u"), r_type
);
2111 case elfcpp::R_X86_64_DTPOFF32
:
2112 if (optimized_type
== tls::TLSOPT_TO_LE
)
2114 // This relocation type is used in debugging information.
2115 // In that case we need to not optimize the value. If we
2116 // haven't seen a TLSLD reloc, then we assume we should not
2117 // optimize this reloc.
2118 if (this->saw_tls_block_reloc_
)
2120 gold_assert(tls_segment
!= NULL
);
2121 value
-= tls_segment
->memsz();
2124 Relocate_functions
<64, false>::rela32(view
, value
, addend
);
2127 case elfcpp::R_X86_64_DTPOFF64
:
2128 if (optimized_type
== tls::TLSOPT_TO_LE
)
2130 // See R_X86_64_DTPOFF32, just above, for why we test this.
2131 if (this->saw_tls_block_reloc_
)
2133 gold_assert(tls_segment
!= NULL
);
2134 value
-= tls_segment
->memsz();
2137 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
2140 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2141 if (optimized_type
== tls::TLSOPT_TO_LE
)
2143 gold_assert(tls_segment
!= NULL
);
2144 Target_x86_64::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2145 rela
, r_type
, value
, view
,
2149 else if (optimized_type
== tls::TLSOPT_NONE
)
2151 // Relocate the field with the offset of the GOT entry for
2152 // the tp-relative offset of the symbol.
2153 unsigned int got_offset
;
2156 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
));
2157 got_offset
= (gsym
->got_offset(GOT_TYPE_TLS_OFFSET
)
2158 - target
->got_size());
2162 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2163 gold_assert(object
->local_has_got_offset(r_sym
,
2164 GOT_TYPE_TLS_OFFSET
));
2165 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
)
2166 - target
->got_size());
2168 value
= target
->got_plt_section()->address() + got_offset
;
2169 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
2172 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2173 _("unsupported reloc type %u"),
2177 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2178 value
-= tls_segment
->memsz();
2179 Relocate_functions
<64, false>::rela32(view
, value
, addend
);
2184 // Do a relocation in which we convert a TLS General-Dynamic to an
2188 Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info
<64, false>* relinfo
,
2191 const elfcpp::Rela
<64, false>& rela
,
2193 elfcpp::Elf_types
<64>::Elf_Addr value
,
2194 unsigned char* view
,
2195 elfcpp::Elf_types
<64>::Elf_Addr address
,
2196 section_size_type view_size
)
2198 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2199 // .word 0x6666; rex64; call __tls_get_addr
2200 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
2202 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
2203 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
2205 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2206 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
2207 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2208 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
2210 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16);
2212 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
2213 Relocate_functions
<64, false>::pcrela32(view
+ 8, value
, addend
- 8, address
);
2215 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2217 this->skip_call_tls_get_addr_
= true;
2220 // Do a relocation in which we convert a TLS General-Dynamic to a
2224 Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info
<64, false>* relinfo
,
2226 Output_segment
* tls_segment
,
2227 const elfcpp::Rela
<64, false>& rela
,
2229 elfcpp::Elf_types
<64>::Elf_Addr value
,
2230 unsigned char* view
,
2231 section_size_type view_size
)
2233 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2234 // .word 0x6666; rex64; call __tls_get_addr
2235 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
2237 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
2238 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
2240 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2241 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
2242 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2243 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
2245 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
2247 value
-= tls_segment
->memsz();
2248 Relocate_functions
<64, false>::rela32(view
+ 8, value
, 0);
2250 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2252 this->skip_call_tls_get_addr_
= true;
2255 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
2258 Target_x86_64::Relocate::tls_desc_gd_to_ie(
2259 const Relocate_info
<64, false>* relinfo
,
2262 const elfcpp::Rela
<64, false>& rela
,
2263 unsigned int r_type
,
2264 elfcpp::Elf_types
<64>::Elf_Addr value
,
2265 unsigned char* view
,
2266 elfcpp::Elf_types
<64>::Elf_Addr address
,
2267 section_size_type view_size
)
2269 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2271 // leaq foo@tlsdesc(%rip), %rax
2272 // ==> movq foo@gottpoff(%rip), %rax
2273 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2274 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2275 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2276 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
2278 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
2279 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
2283 // call *foo@tlscall(%rax)
2285 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
2286 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
2287 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2288 view
[0] == 0xff && view
[1] == 0x10);
2294 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
2297 Target_x86_64::Relocate::tls_desc_gd_to_le(
2298 const Relocate_info
<64, false>* relinfo
,
2300 Output_segment
* tls_segment
,
2301 const elfcpp::Rela
<64, false>& rela
,
2302 unsigned int r_type
,
2303 elfcpp::Elf_types
<64>::Elf_Addr value
,
2304 unsigned char* view
,
2305 section_size_type view_size
)
2307 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2309 // leaq foo@tlsdesc(%rip), %rax
2310 // ==> movq foo@tpoff, %rax
2311 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2312 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2313 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2314 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
2317 value
-= tls_segment
->memsz();
2318 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2322 // call *foo@tlscall(%rax)
2324 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
2325 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
2326 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2327 view
[0] == 0xff && view
[1] == 0x10);
2334 Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info
<64, false>* relinfo
,
2337 const elfcpp::Rela
<64, false>& rela
,
2339 elfcpp::Elf_types
<64>::Elf_Addr
,
2340 unsigned char* view
,
2341 section_size_type view_size
)
2343 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
2344 // ... leq foo@dtpoff(%rax),%reg
2345 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
2347 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2348 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 9);
2350 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2351 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x3d);
2353 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(), view
[4] == 0xe8);
2355 memcpy(view
- 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
2357 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2359 this->skip_call_tls_get_addr_
= true;
2362 // Do a relocation in which we convert a TLS Initial-Exec to a
2366 Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info
<64, false>* relinfo
,
2368 Output_segment
* tls_segment
,
2369 const elfcpp::Rela
<64, false>& rela
,
2371 elfcpp::Elf_types
<64>::Elf_Addr value
,
2372 unsigned char* view
,
2373 section_size_type view_size
)
2375 // We need to examine the opcodes to figure out which instruction we
2378 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
2379 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
2381 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2382 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2384 unsigned char op1
= view
[-3];
2385 unsigned char op2
= view
[-2];
2386 unsigned char op3
= view
[-1];
2387 unsigned char reg
= op3
>> 3;
2395 view
[-1] = 0xc0 | reg
;
2399 // Special handling for %rsp.
2403 view
[-1] = 0xc0 | reg
;
2411 view
[-1] = 0x80 | reg
| (reg
<< 3);
2414 value
-= tls_segment
->memsz();
2415 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2418 // Relocate section data.
2421 Target_x86_64::relocate_section(
2422 const Relocate_info
<64, false>* relinfo
,
2423 unsigned int sh_type
,
2424 const unsigned char* prelocs
,
2426 Output_section
* output_section
,
2427 bool needs_special_offset_handling
,
2428 unsigned char* view
,
2429 elfcpp::Elf_types
<64>::Elf_Addr address
,
2430 section_size_type view_size
,
2431 const Reloc_symbol_changes
* reloc_symbol_changes
)
2433 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2435 gold::relocate_section
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
2436 Target_x86_64::Relocate
>(
2442 needs_special_offset_handling
,
2446 reloc_symbol_changes
);
2449 // Return the size of a relocation while scanning during a relocatable
2453 Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc(
2454 unsigned int r_type
,
2459 case elfcpp::R_X86_64_NONE
:
2460 case elfcpp::R_386_GNU_VTINHERIT
:
2461 case elfcpp::R_386_GNU_VTENTRY
:
2462 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
2463 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2464 case elfcpp::R_X86_64_TLSDESC_CALL
:
2465 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2466 case elfcpp::R_X86_64_DTPOFF32
:
2467 case elfcpp::R_X86_64_DTPOFF64
:
2468 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2469 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2472 case elfcpp::R_X86_64_64
:
2473 case elfcpp::R_X86_64_PC64
:
2474 case elfcpp::R_X86_64_GOTOFF64
:
2475 case elfcpp::R_X86_64_GOTPC64
:
2476 case elfcpp::R_X86_64_PLTOFF64
:
2477 case elfcpp::R_X86_64_GOT64
:
2478 case elfcpp::R_X86_64_GOTPCREL64
:
2479 case elfcpp::R_X86_64_GOTPCREL
:
2480 case elfcpp::R_X86_64_GOTPLT64
:
2483 case elfcpp::R_X86_64_32
:
2484 case elfcpp::R_X86_64_32S
:
2485 case elfcpp::R_X86_64_PC32
:
2486 case elfcpp::R_X86_64_PLT32
:
2487 case elfcpp::R_X86_64_GOTPC32
:
2488 case elfcpp::R_X86_64_GOT32
:
2491 case elfcpp::R_X86_64_16
:
2492 case elfcpp::R_X86_64_PC16
:
2495 case elfcpp::R_X86_64_8
:
2496 case elfcpp::R_X86_64_PC8
:
2499 case elfcpp::R_X86_64_COPY
:
2500 case elfcpp::R_X86_64_GLOB_DAT
:
2501 case elfcpp::R_X86_64_JUMP_SLOT
:
2502 case elfcpp::R_X86_64_RELATIVE
:
2503 // These are outstanding tls relocs, which are unexpected when linking
2504 case elfcpp::R_X86_64_TPOFF64
:
2505 case elfcpp::R_X86_64_DTPMOD64
:
2506 case elfcpp::R_X86_64_TLSDESC
:
2507 object
->error(_("unexpected reloc %u in object file"), r_type
);
2510 case elfcpp::R_X86_64_SIZE32
:
2511 case elfcpp::R_X86_64_SIZE64
:
2513 object
->error(_("unsupported reloc %u against local symbol"), r_type
);
2518 // Scan the relocs during a relocatable link.
2521 Target_x86_64::scan_relocatable_relocs(Symbol_table
* symtab
,
2523 Sized_relobj
<64, false>* object
,
2524 unsigned int data_shndx
,
2525 unsigned int sh_type
,
2526 const unsigned char* prelocs
,
2528 Output_section
* output_section
,
2529 bool needs_special_offset_handling
,
2530 size_t local_symbol_count
,
2531 const unsigned char* plocal_symbols
,
2532 Relocatable_relocs
* rr
)
2534 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2536 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
2537 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2539 gold::scan_relocatable_relocs
<64, false, elfcpp::SHT_RELA
,
2540 Scan_relocatable_relocs
>(
2548 needs_special_offset_handling
,
2554 // Relocate a section during a relocatable link.
2557 Target_x86_64::relocate_for_relocatable(
2558 const Relocate_info
<64, false>* relinfo
,
2559 unsigned int sh_type
,
2560 const unsigned char* prelocs
,
2562 Output_section
* output_section
,
2563 off_t offset_in_output_section
,
2564 const Relocatable_relocs
* rr
,
2565 unsigned char* view
,
2566 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
2567 section_size_type view_size
,
2568 unsigned char* reloc_view
,
2569 section_size_type reloc_view_size
)
2571 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2573 gold::relocate_for_relocatable
<64, false, elfcpp::SHT_RELA
>(
2578 offset_in_output_section
,
2587 // Return the value to use for a dynamic which requires special
2588 // treatment. This is how we support equality comparisons of function
2589 // pointers across shared library boundaries, as described in the
2590 // processor specific ABI supplement.
2593 Target_x86_64::do_dynsym_value(const Symbol
* gsym
) const
2595 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2596 return this->plt_section()->address() + gsym
->plt_offset();
2599 // Return a string used to fill a code section with nops to take up
2600 // the specified length.
2603 Target_x86_64::do_code_fill(section_size_type length
) const
2607 // Build a jmpq instruction to skip over the bytes.
2608 unsigned char jmp
[5];
2610 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2611 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2612 + std::string(length
- 5, '\0'));
2615 // Nop sequences of various lengths.
2616 const char nop1
[1] = { 0x90 }; // nop
2617 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2618 const char nop3
[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax)
2619 const char nop4
[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax)
2620 const char nop5
[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1)
2622 const char nop6
[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1)
2624 const char nop7
[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax)
2626 const char nop8
[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1)
2627 0x00, 0x00, 0x00, 0x00 };
2628 const char nop9
[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1)
2629 0x00, 0x00, 0x00, 0x00,
2631 const char nop10
[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1)
2632 0x84, 0x00, 0x00, 0x00,
2634 const char nop11
[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16
2635 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2637 const char nop12
[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16
2638 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1)
2639 0x00, 0x00, 0x00, 0x00 };
2640 const char nop13
[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2641 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1)
2642 0x00, 0x00, 0x00, 0x00,
2644 const char nop14
[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2645 0x66, 0x2e, 0x0f, 0x1f, // data16
2646 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2648 const char nop15
[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2649 0x66, 0x66, 0x2e, 0x0f, // data16; data16
2650 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2653 const char* nops
[16] = {
2655 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2656 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2659 return std::string(nops
[length
], length
);
2662 // FNOFFSET in section SHNDX in OBJECT is the start of a function
2663 // compiled with -fstack-split. The function calls non-stack-split
2664 // code. We have to change the function so that it always ensures
2665 // that it has enough stack space to run some random function.
2668 Target_x86_64::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
2669 section_offset_type fnoffset
,
2670 section_size_type fnsize
,
2671 unsigned char* view
,
2672 section_size_type view_size
,
2674 std::string
* to
) const
2676 // The function starts with a comparison of the stack pointer and a
2677 // field in the TCB. This is followed by a jump.
2680 if (this->match_view(view
, view_size
, fnoffset
, "\x64\x48\x3b\x24\x25", 5)
2683 // We will call __morestack if the carry flag is set after this
2684 // comparison. We turn the comparison into an stc instruction
2686 view
[fnoffset
] = '\xf9';
2687 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 8);
2689 // lea NN(%rsp),%r10
2690 else if (this->match_view(view
, view_size
, fnoffset
, "\x4c\x8d\x94\x24", 4)
2693 // This is loading an offset from the stack pointer for a
2694 // comparison. The offset is negative, so we decrease the
2695 // offset by the amount of space we need for the stack. This
2696 // means we will avoid calling __morestack if there happens to
2697 // be plenty of space on the stack already.
2698 unsigned char* pval
= view
+ fnoffset
+ 4;
2699 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
2700 val
-= parameters
->options().split_stack_adjust_size();
2701 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
2705 if (!object
->has_no_split_stack())
2706 object
->error(_("failed to match split-stack sequence at "
2707 "section %u offset %0zx"),
2712 // We have to change the function so that it calls
2713 // __morestack_non_split instead of __morestack. The former will
2714 // allocate additional stack space.
2715 *from
= "__morestack";
2716 *to
= "__morestack_non_split";
2719 // The selector for x86_64 object files.
2721 class Target_selector_x86_64
: public Target_selector_freebsd
2724 Target_selector_x86_64()
2725 : Target_selector_freebsd(elfcpp::EM_X86_64
, 64, false, "elf64-x86-64",
2726 "elf64-x86-64-freebsd")
2730 do_instantiate_target()
2731 { return new Target_x86_64(); }
2735 Target_selector_x86_64 target_selector_x86_64
;
2737 } // End anonymous namespace.