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
*, Symbol_table
*);
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
443 NULL
, // attributes_section
444 NULL
// attributes_vendor
447 // This is called when a new output section is created. This is where
448 // we handle the SHF_X86_64_LARGE.
451 Target_x86_64::do_new_output_section(Output_section
*os
) const
453 if ((os
->flags() & elfcpp::SHF_X86_64_LARGE
) != 0)
454 os
->set_is_large_section();
457 // Get the GOT section, creating it if necessary.
459 Output_data_got
<64, false>*
460 Target_x86_64::got_section(Symbol_table
* symtab
, Layout
* layout
)
462 if (this->got_
== NULL
)
464 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
466 this->got_
= new Output_data_got
<64, false>();
469 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
471 | elfcpp::SHF_WRITE
),
475 // The old GNU linker creates a .got.plt section. We just
476 // create another set of data in the .got section. Note that we
477 // always create a PLT if we create a GOT, although the PLT
479 this->got_plt_
= new Output_data_space(8, "** GOT PLT");
480 os
= layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
482 | elfcpp::SHF_WRITE
),
483 this->got_plt_
, false);
486 // The first three entries are reserved.
487 this->got_plt_
->set_current_data_size(3 * 8);
489 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
490 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
492 0, 0, elfcpp::STT_OBJECT
,
494 elfcpp::STV_HIDDEN
, 0,
501 // Get the dynamic reloc section, creating it if necessary.
503 Target_x86_64::Reloc_section
*
504 Target_x86_64::rela_dyn_section(Layout
* layout
)
506 if (this->rela_dyn_
== NULL
)
508 gold_assert(layout
!= NULL
);
509 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
510 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
511 elfcpp::SHF_ALLOC
, this->rela_dyn_
, true);
513 return this->rela_dyn_
;
516 // A class to handle the PLT data.
518 class Output_data_plt_x86_64
: public Output_section_data
521 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false> Reloc_section
;
523 Output_data_plt_x86_64(Layout
*, Output_data_got
<64, false>*,
526 // Add an entry to the PLT.
528 add_entry(Symbol
* gsym
);
530 // Add the reserved TLSDESC_PLT entry to the PLT.
532 reserve_tlsdesc_entry(unsigned int got_offset
)
533 { this->tlsdesc_got_offset_
= got_offset
; }
535 // Return true if a TLSDESC_PLT entry has been reserved.
537 has_tlsdesc_entry() const
538 { return this->tlsdesc_got_offset_
!= -1U; }
540 // Return the GOT offset for the reserved TLSDESC_PLT entry.
542 get_tlsdesc_got_offset() const
543 { return this->tlsdesc_got_offset_
; }
545 // Return the offset of the reserved TLSDESC_PLT entry.
547 get_tlsdesc_plt_offset() const
548 { return (this->count_
+ 1) * plt_entry_size
; }
550 // Return the .rel.plt section data.
553 { return this->rel_
; }
557 do_adjust_output_section(Output_section
* os
);
559 // Write to a map file.
561 do_print_to_mapfile(Mapfile
* mapfile
) const
562 { mapfile
->print_output_data(this, _("** PLT")); }
565 // The size of an entry in the PLT.
566 static const int plt_entry_size
= 16;
568 // The first entry in the PLT.
569 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
570 // procedure linkage table for both programs and shared objects."
571 static unsigned char first_plt_entry
[plt_entry_size
];
573 // Other entries in the PLT for an executable.
574 static unsigned char plt_entry
[plt_entry_size
];
576 // The reserved TLSDESC entry in the PLT for an executable.
577 static unsigned char tlsdesc_plt_entry
[plt_entry_size
];
579 // Set the final size.
581 set_final_data_size();
583 // Write out the PLT data.
585 do_write(Output_file
*);
587 // The reloc section.
590 Output_data_got
<64, false>* got_
;
591 // The .got.plt section.
592 Output_data_space
* got_plt_
;
593 // The number of PLT entries.
595 // Offset of the reserved TLSDESC_GOT entry when needed.
596 unsigned int tlsdesc_got_offset_
;
599 // Create the PLT section. The ordinary .got section is an argument,
600 // since we need to refer to the start. We also create our own .got
601 // section just for PLT entries.
603 Output_data_plt_x86_64::Output_data_plt_x86_64(Layout
* layout
,
604 Output_data_got
<64, false>* got
,
605 Output_data_space
* got_plt
)
606 : Output_section_data(8), got_(got
), got_plt_(got_plt
), count_(0),
607 tlsdesc_got_offset_(-1U)
609 this->rel_
= new Reloc_section(false);
610 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
611 elfcpp::SHF_ALLOC
, this->rel_
, true);
615 Output_data_plt_x86_64::do_adjust_output_section(Output_section
* os
)
617 os
->set_entsize(plt_entry_size
);
620 // Add an entry to the PLT.
623 Output_data_plt_x86_64::add_entry(Symbol
* gsym
)
625 gold_assert(!gsym
->has_plt_offset());
627 // Note that when setting the PLT offset we skip the initial
628 // reserved PLT entry.
629 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
633 section_offset_type got_offset
= this->got_plt_
->current_data_size();
635 // Every PLT entry needs a GOT entry which points back to the PLT
636 // entry (this will be changed by the dynamic linker, normally
637 // lazily when the function is called).
638 this->got_plt_
->set_current_data_size(got_offset
+ 8);
640 // Every PLT entry needs a reloc.
641 gsym
->set_needs_dynsym_entry();
642 this->rel_
->add_global(gsym
, elfcpp::R_X86_64_JUMP_SLOT
, this->got_plt_
,
645 // Note that we don't need to save the symbol. The contents of the
646 // PLT are independent of which symbols are used. The symbols only
647 // appear in the relocations.
650 // Set the final size.
652 Output_data_plt_x86_64::set_final_data_size()
654 unsigned int count
= this->count_
;
655 if (this->has_tlsdesc_entry())
657 this->set_data_size((count
+ 1) * plt_entry_size
);
660 // The first entry in the PLT for an executable.
662 unsigned char Output_data_plt_x86_64::first_plt_entry
[plt_entry_size
] =
664 // From AMD64 ABI Draft 0.98, page 76
665 0xff, 0x35, // pushq contents of memory address
666 0, 0, 0, 0, // replaced with address of .got + 8
667 0xff, 0x25, // jmp indirect
668 0, 0, 0, 0, // replaced with address of .got + 16
669 0x90, 0x90, 0x90, 0x90 // noop (x4)
672 // Subsequent entries in the PLT for an executable.
674 unsigned char Output_data_plt_x86_64::plt_entry
[plt_entry_size
] =
676 // From AMD64 ABI Draft 0.98, page 76
677 0xff, 0x25, // jmpq indirect
678 0, 0, 0, 0, // replaced with address of symbol in .got
679 0x68, // pushq immediate
680 0, 0, 0, 0, // replaced with offset into relocation table
681 0xe9, // jmpq relative
682 0, 0, 0, 0 // replaced with offset to start of .plt
685 // The reserved TLSDESC entry in the PLT for an executable.
687 unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry
[plt_entry_size
] =
689 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
690 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
691 0xff, 0x35, // pushq x(%rip)
692 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
693 0xff, 0x25, // jmpq *y(%rip)
694 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
699 // Write out the PLT. This uses the hand-coded instructions above,
700 // and adjusts them as needed. This is specified by the AMD64 ABI.
703 Output_data_plt_x86_64::do_write(Output_file
* of
)
705 const off_t off
= this->offset();
706 const section_size_type oview_size
=
707 convert_to_section_size_type(this->data_size());
708 unsigned char* const oview
= of
->get_output_view(off
, oview_size
);
710 const off_t got_file_offset
= this->got_plt_
->offset();
711 const section_size_type got_size
=
712 convert_to_section_size_type(this->got_plt_
->data_size());
713 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
716 unsigned char* pov
= oview
;
718 // The base address of the .plt section.
719 elfcpp::Elf_types
<64>::Elf_Addr plt_address
= this->address();
720 // The base address of the .got section.
721 elfcpp::Elf_types
<64>::Elf_Addr got_base
= this->got_
->address();
722 // The base address of the PLT portion of the .got section,
723 // which is where the GOT pointer will point, and where the
724 // three reserved GOT entries are located.
725 elfcpp::Elf_types
<64>::Elf_Addr got_address
= this->got_plt_
->address();
727 memcpy(pov
, first_plt_entry
, plt_entry_size
);
728 // We do a jmp relative to the PC at the end of this instruction.
729 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
731 - (plt_address
+ 6)));
732 elfcpp::Swap
<32, false>::writeval(pov
+ 8,
734 - (plt_address
+ 12)));
735 pov
+= plt_entry_size
;
737 unsigned char* got_pov
= got_view
;
739 memset(got_pov
, 0, 24);
742 unsigned int plt_offset
= plt_entry_size
;
743 unsigned int got_offset
= 24;
744 const unsigned int count
= this->count_
;
745 for (unsigned int plt_index
= 0;
748 pov
+= plt_entry_size
,
750 plt_offset
+= plt_entry_size
,
753 // Set and adjust the PLT entry itself.
754 memcpy(pov
, plt_entry
, plt_entry_size
);
755 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
756 (got_address
+ got_offset
757 - (plt_address
+ plt_offset
760 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_index
);
761 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
762 - (plt_offset
+ plt_entry_size
));
764 // Set the entry in the GOT.
765 elfcpp::Swap
<64, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
768 if (this->has_tlsdesc_entry())
770 // Set and adjust the reserved TLSDESC PLT entry.
771 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
772 memcpy(pov
, tlsdesc_plt_entry
, plt_entry_size
);
773 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
775 - (plt_address
+ plt_offset
777 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 8,
780 - (plt_address
+ plt_offset
782 pov
+= plt_entry_size
;
785 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
786 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
788 of
->write_output_view(off
, oview_size
, oview
);
789 of
->write_output_view(got_file_offset
, got_size
, got_view
);
792 // Create the PLT section.
795 Target_x86_64::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
797 if (this->plt_
== NULL
)
799 // Create the GOT sections first.
800 this->got_section(symtab
, layout
);
802 this->plt_
= new Output_data_plt_x86_64(layout
, this->got_
,
804 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
806 | elfcpp::SHF_EXECINSTR
),
811 // Create a PLT entry for a global symbol.
814 Target_x86_64::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
817 if (gsym
->has_plt_offset())
820 if (this->plt_
== NULL
)
821 this->make_plt_section(symtab
, layout
);
823 this->plt_
->add_entry(gsym
);
826 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
829 Target_x86_64::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
831 if (this->tls_base_symbol_defined_
)
834 Output_segment
* tls_segment
= layout
->tls_segment();
835 if (tls_segment
!= NULL
)
837 bool is_exec
= parameters
->options().output_is_executable();
838 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
842 elfcpp::STV_HIDDEN
, 0,
844 ? Symbol::SEGMENT_END
845 : Symbol::SEGMENT_START
),
848 this->tls_base_symbol_defined_
= true;
851 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
854 Target_x86_64::reserve_tlsdesc_entries(Symbol_table
* symtab
,
857 if (this->plt_
== NULL
)
858 this->make_plt_section(symtab
, layout
);
860 if (!this->plt_
->has_tlsdesc_entry())
862 // Allocate the TLSDESC_GOT entry.
863 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
864 unsigned int got_offset
= got
->add_constant(0);
866 // Allocate the TLSDESC_PLT entry.
867 this->plt_
->reserve_tlsdesc_entry(got_offset
);
871 // Create a GOT entry for the TLS module index.
874 Target_x86_64::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
875 Sized_relobj
<64, false>* object
)
877 if (this->got_mod_index_offset_
== -1U)
879 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
880 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
881 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
882 unsigned int got_offset
= got
->add_constant(0);
883 rela_dyn
->add_local(object
, 0, elfcpp::R_X86_64_DTPMOD64
, got
,
885 got
->add_constant(0);
886 this->got_mod_index_offset_
= got_offset
;
888 return this->got_mod_index_offset_
;
891 // Optimize the TLS relocation type based on what we know about the
892 // symbol. IS_FINAL is true if the final address of this symbol is
893 // known at link time.
895 tls::Tls_optimization
896 Target_x86_64::optimize_tls_reloc(bool is_final
, int r_type
)
898 // If we are generating a shared library, then we can't do anything
900 if (parameters
->options().shared())
901 return tls::TLSOPT_NONE
;
905 case elfcpp::R_X86_64_TLSGD
:
906 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
907 case elfcpp::R_X86_64_TLSDESC_CALL
:
908 // These are General-Dynamic which permits fully general TLS
909 // access. Since we know that we are generating an executable,
910 // we can convert this to Initial-Exec. If we also know that
911 // this is a local symbol, we can further switch to Local-Exec.
913 return tls::TLSOPT_TO_LE
;
914 return tls::TLSOPT_TO_IE
;
916 case elfcpp::R_X86_64_TLSLD
:
917 // This is Local-Dynamic, which refers to a local symbol in the
918 // dynamic TLS block. Since we know that we generating an
919 // executable, we can switch to Local-Exec.
920 return tls::TLSOPT_TO_LE
;
922 case elfcpp::R_X86_64_DTPOFF32
:
923 case elfcpp::R_X86_64_DTPOFF64
:
924 // Another Local-Dynamic reloc.
925 return tls::TLSOPT_TO_LE
;
927 case elfcpp::R_X86_64_GOTTPOFF
:
928 // These are Initial-Exec relocs which get the thread offset
929 // from the GOT. If we know that we are linking against the
930 // local symbol, we can switch to Local-Exec, which links the
931 // thread offset into the instruction.
933 return tls::TLSOPT_TO_LE
;
934 return tls::TLSOPT_NONE
;
936 case elfcpp::R_X86_64_TPOFF32
:
937 // When we already have Local-Exec, there is nothing further we
939 return tls::TLSOPT_NONE
;
946 // Report an unsupported relocation against a local symbol.
949 Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj
<64, false>* object
,
952 gold_error(_("%s: unsupported reloc %u against local symbol"),
953 object
->name().c_str(), r_type
);
956 // We are about to emit a dynamic relocation of type R_TYPE. If the
957 // dynamic linker does not support it, issue an error. The GNU linker
958 // only issues a non-PIC error for an allocated read-only section.
959 // Here we know the section is allocated, but we don't know that it is
960 // read-only. But we check for all the relocation types which the
961 // glibc dynamic linker supports, so it seems appropriate to issue an
962 // error even if the section is not read-only.
965 Target_x86_64::Scan::check_non_pic(Relobj
* object
, unsigned int r_type
)
969 // These are the relocation types supported by glibc for x86_64.
970 case elfcpp::R_X86_64_RELATIVE
:
971 case elfcpp::R_X86_64_GLOB_DAT
:
972 case elfcpp::R_X86_64_JUMP_SLOT
:
973 case elfcpp::R_X86_64_DTPMOD64
:
974 case elfcpp::R_X86_64_DTPOFF64
:
975 case elfcpp::R_X86_64_TPOFF64
:
976 case elfcpp::R_X86_64_64
:
977 case elfcpp::R_X86_64_32
:
978 case elfcpp::R_X86_64_PC32
:
979 case elfcpp::R_X86_64_COPY
:
983 // This prevents us from issuing more than one error per reloc
984 // section. But we can still wind up issuing more than one
985 // error per object file.
986 if (this->issued_non_pic_error_
)
988 gold_assert(parameters
->options().output_is_position_independent());
989 object
->error(_("requires unsupported dynamic reloc; "
990 "recompile with -fPIC"));
991 this->issued_non_pic_error_
= true;
994 case elfcpp::R_X86_64_NONE
:
999 // Scan a relocation for a local symbol.
1002 Target_x86_64::Scan::local(Symbol_table
* symtab
,
1004 Target_x86_64
* target
,
1005 Sized_relobj
<64, false>* object
,
1006 unsigned int data_shndx
,
1007 Output_section
* output_section
,
1008 const elfcpp::Rela
<64, false>& reloc
,
1009 unsigned int r_type
,
1010 const elfcpp::Sym
<64, false>& lsym
)
1014 case elfcpp::R_X86_64_NONE
:
1015 case elfcpp::R_386_GNU_VTINHERIT
:
1016 case elfcpp::R_386_GNU_VTENTRY
:
1019 case elfcpp::R_X86_64_64
:
1020 // If building a shared library (or a position-independent
1021 // executable), we need to create a dynamic relocation for this
1022 // location. The relocation applied at link time will apply the
1023 // link-time value, so we flag the location with an
1024 // R_X86_64_RELATIVE relocation so the dynamic loader can
1025 // relocate it easily.
1026 if (parameters
->options().output_is_position_independent())
1028 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1029 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1030 rela_dyn
->add_local_relative(object
, r_sym
,
1031 elfcpp::R_X86_64_RELATIVE
,
1032 output_section
, data_shndx
,
1033 reloc
.get_r_offset(),
1034 reloc
.get_r_addend());
1038 case elfcpp::R_X86_64_32
:
1039 case elfcpp::R_X86_64_32S
:
1040 case elfcpp::R_X86_64_16
:
1041 case elfcpp::R_X86_64_8
:
1042 // If building a shared library (or a position-independent
1043 // executable), we need to create a dynamic relocation for this
1044 // location. We can't use an R_X86_64_RELATIVE relocation
1045 // because that is always a 64-bit relocation.
1046 if (parameters
->options().output_is_position_independent())
1048 this->check_non_pic(object
, r_type
);
1050 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1051 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1052 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
1053 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
1054 data_shndx
, reloc
.get_r_offset(),
1055 reloc
.get_r_addend());
1058 gold_assert(lsym
.get_st_value() == 0);
1059 unsigned int shndx
= lsym
.get_st_shndx();
1061 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
1064 object
->error(_("section symbol %u has bad shndx %u"),
1067 rela_dyn
->add_local_section(object
, shndx
,
1068 r_type
, output_section
,
1069 data_shndx
, reloc
.get_r_offset(),
1070 reloc
.get_r_addend());
1075 case elfcpp::R_X86_64_PC64
:
1076 case elfcpp::R_X86_64_PC32
:
1077 case elfcpp::R_X86_64_PC16
:
1078 case elfcpp::R_X86_64_PC8
:
1081 case elfcpp::R_X86_64_PLT32
:
1082 // Since we know this is a local symbol, we can handle this as a
1086 case elfcpp::R_X86_64_GOTPC32
:
1087 case elfcpp::R_X86_64_GOTOFF64
:
1088 case elfcpp::R_X86_64_GOTPC64
:
1089 case elfcpp::R_X86_64_PLTOFF64
:
1090 // We need a GOT section.
1091 target
->got_section(symtab
, layout
);
1092 // For PLTOFF64, we'd normally want a PLT section, but since we
1093 // know this is a local symbol, no PLT is needed.
1096 case elfcpp::R_X86_64_GOT64
:
1097 case elfcpp::R_X86_64_GOT32
:
1098 case elfcpp::R_X86_64_GOTPCREL64
:
1099 case elfcpp::R_X86_64_GOTPCREL
:
1100 case elfcpp::R_X86_64_GOTPLT64
:
1102 // The symbol requires a GOT entry.
1103 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1104 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1105 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
1107 // If we are generating a shared object, we need to add a
1108 // dynamic relocation for this symbol's GOT entry.
1109 if (parameters
->options().output_is_position_independent())
1111 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1112 // R_X86_64_RELATIVE assumes a 64-bit relocation.
1113 if (r_type
!= elfcpp::R_X86_64_GOT32
)
1114 rela_dyn
->add_local_relative(
1115 object
, r_sym
, elfcpp::R_X86_64_RELATIVE
, got
,
1116 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
1119 this->check_non_pic(object
, r_type
);
1121 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1122 rela_dyn
->add_local(
1123 object
, r_sym
, r_type
, got
,
1124 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
1128 // For GOTPLT64, we'd normally want a PLT section, but since
1129 // we know this is a local symbol, no PLT is needed.
1133 case elfcpp::R_X86_64_COPY
:
1134 case elfcpp::R_X86_64_GLOB_DAT
:
1135 case elfcpp::R_X86_64_JUMP_SLOT
:
1136 case elfcpp::R_X86_64_RELATIVE
:
1137 // These are outstanding tls relocs, which are unexpected when linking
1138 case elfcpp::R_X86_64_TPOFF64
:
1139 case elfcpp::R_X86_64_DTPMOD64
:
1140 case elfcpp::R_X86_64_TLSDESC
:
1141 gold_error(_("%s: unexpected reloc %u in object file"),
1142 object
->name().c_str(), r_type
);
1145 // These are initial tls relocs, which are expected when linking
1146 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1147 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1148 case elfcpp::R_X86_64_TLSDESC_CALL
:
1149 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1150 case elfcpp::R_X86_64_DTPOFF32
:
1151 case elfcpp::R_X86_64_DTPOFF64
:
1152 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1153 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1155 bool output_is_shared
= parameters
->options().shared();
1156 const tls::Tls_optimization optimized_type
1157 = Target_x86_64::optimize_tls_reloc(!output_is_shared
, r_type
);
1160 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1161 if (optimized_type
== tls::TLSOPT_NONE
)
1163 // Create a pair of GOT entries for the module index and
1164 // dtv-relative offset.
1165 Output_data_got
<64, false>* got
1166 = target
->got_section(symtab
, layout
);
1167 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1168 unsigned int shndx
= lsym
.get_st_shndx();
1170 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1172 object
->error(_("local symbol %u has bad shndx %u"),
1175 got
->add_local_pair_with_rela(object
, r_sym
,
1178 target
->rela_dyn_section(layout
),
1179 elfcpp::R_X86_64_DTPMOD64
, 0);
1181 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1182 unsupported_reloc_local(object
, r_type
);
1185 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1186 target
->define_tls_base_symbol(symtab
, layout
);
1187 if (optimized_type
== tls::TLSOPT_NONE
)
1189 // Create reserved PLT and GOT entries for the resolver.
1190 target
->reserve_tlsdesc_entries(symtab
, layout
);
1192 // Generate a double GOT entry with an R_X86_64_TLSDESC reloc.
1193 Output_data_got
<64, false>* got
1194 = target
->got_section(symtab
, layout
);
1195 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1196 unsigned int shndx
= lsym
.get_st_shndx();
1198 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1200 object
->error(_("local symbol %u has bad shndx %u"),
1203 got
->add_local_pair_with_rela(object
, r_sym
,
1206 target
->rela_dyn_section(layout
),
1207 elfcpp::R_X86_64_TLSDESC
, 0);
1209 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1210 unsupported_reloc_local(object
, r_type
);
1213 case elfcpp::R_X86_64_TLSDESC_CALL
:
1216 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1217 if (optimized_type
== tls::TLSOPT_NONE
)
1219 // Create a GOT entry for the module index.
1220 target
->got_mod_index_entry(symtab
, layout
, object
);
1222 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1223 unsupported_reloc_local(object
, r_type
);
1226 case elfcpp::R_X86_64_DTPOFF32
:
1227 case elfcpp::R_X86_64_DTPOFF64
:
1230 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1231 layout
->set_has_static_tls();
1232 if (optimized_type
== tls::TLSOPT_NONE
)
1234 // Create a GOT entry for the tp-relative offset.
1235 Output_data_got
<64, false>* got
1236 = target
->got_section(symtab
, layout
);
1237 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1238 got
->add_local_with_rela(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
1239 target
->rela_dyn_section(layout
),
1240 elfcpp::R_X86_64_TPOFF64
);
1242 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1243 unsupported_reloc_local(object
, r_type
);
1246 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1247 layout
->set_has_static_tls();
1248 if (output_is_shared
)
1249 unsupported_reloc_local(object
, r_type
);
1258 case elfcpp::R_X86_64_SIZE32
:
1259 case elfcpp::R_X86_64_SIZE64
:
1261 gold_error(_("%s: unsupported reloc %u against local symbol"),
1262 object
->name().c_str(), r_type
);
1268 // Report an unsupported relocation against a global symbol.
1271 Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj
<64, false>* object
,
1272 unsigned int r_type
,
1275 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1276 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1279 // Scan a relocation for a global symbol.
1282 Target_x86_64::Scan::global(Symbol_table
* symtab
,
1284 Target_x86_64
* target
,
1285 Sized_relobj
<64, false>* object
,
1286 unsigned int data_shndx
,
1287 Output_section
* output_section
,
1288 const elfcpp::Rela
<64, false>& reloc
,
1289 unsigned int r_type
,
1294 case elfcpp::R_X86_64_NONE
:
1295 case elfcpp::R_386_GNU_VTINHERIT
:
1296 case elfcpp::R_386_GNU_VTENTRY
:
1299 case elfcpp::R_X86_64_64
:
1300 case elfcpp::R_X86_64_32
:
1301 case elfcpp::R_X86_64_32S
:
1302 case elfcpp::R_X86_64_16
:
1303 case elfcpp::R_X86_64_8
:
1305 // Make a PLT entry if necessary.
1306 if (gsym
->needs_plt_entry())
1308 target
->make_plt_entry(symtab
, layout
, gsym
);
1309 // Since this is not a PC-relative relocation, we may be
1310 // taking the address of a function. In that case we need to
1311 // set the entry in the dynamic symbol table to the address of
1313 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1314 gsym
->set_needs_dynsym_value();
1316 // Make a dynamic relocation if necessary.
1317 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1319 if (gsym
->may_need_copy_reloc())
1321 target
->copy_reloc(symtab
, layout
, object
,
1322 data_shndx
, output_section
, gsym
, reloc
);
1324 else if (r_type
== elfcpp::R_X86_64_64
1325 && gsym
->can_use_relative_reloc(false))
1327 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1328 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_RELATIVE
,
1329 output_section
, object
,
1330 data_shndx
, reloc
.get_r_offset(),
1331 reloc
.get_r_addend());
1335 this->check_non_pic(object
, r_type
);
1336 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1337 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1338 data_shndx
, reloc
.get_r_offset(),
1339 reloc
.get_r_addend());
1345 case elfcpp::R_X86_64_PC64
:
1346 case elfcpp::R_X86_64_PC32
:
1347 case elfcpp::R_X86_64_PC16
:
1348 case elfcpp::R_X86_64_PC8
:
1350 // Make a PLT entry if necessary.
1351 if (gsym
->needs_plt_entry())
1352 target
->make_plt_entry(symtab
, layout
, gsym
);
1353 // Make a dynamic relocation if necessary.
1354 int flags
= Symbol::NON_PIC_REF
;
1355 if (gsym
->is_func())
1356 flags
|= Symbol::FUNCTION_CALL
;
1357 if (gsym
->needs_dynamic_reloc(flags
))
1359 if (gsym
->may_need_copy_reloc())
1361 target
->copy_reloc(symtab
, layout
, object
,
1362 data_shndx
, output_section
, gsym
, reloc
);
1366 this->check_non_pic(object
, r_type
);
1367 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1368 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1369 data_shndx
, reloc
.get_r_offset(),
1370 reloc
.get_r_addend());
1376 case elfcpp::R_X86_64_GOT64
:
1377 case elfcpp::R_X86_64_GOT32
:
1378 case elfcpp::R_X86_64_GOTPCREL64
:
1379 case elfcpp::R_X86_64_GOTPCREL
:
1380 case elfcpp::R_X86_64_GOTPLT64
:
1382 // The symbol requires a GOT entry.
1383 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1384 if (gsym
->final_value_is_known())
1385 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1388 // If this symbol is not fully resolved, we need to add a
1389 // dynamic relocation for it.
1390 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1391 if (gsym
->is_from_dynobj()
1392 || gsym
->is_undefined()
1393 || gsym
->is_preemptible())
1394 got
->add_global_with_rela(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
1395 elfcpp::R_X86_64_GLOB_DAT
);
1398 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1399 rela_dyn
->add_global_relative(
1400 gsym
, elfcpp::R_X86_64_RELATIVE
, got
,
1401 gsym
->got_offset(GOT_TYPE_STANDARD
), 0);
1404 // For GOTPLT64, we also need a PLT entry (but only if the
1405 // symbol is not fully resolved).
1406 if (r_type
== elfcpp::R_X86_64_GOTPLT64
1407 && !gsym
->final_value_is_known())
1408 target
->make_plt_entry(symtab
, layout
, gsym
);
1412 case elfcpp::R_X86_64_PLT32
:
1413 // If the symbol is fully resolved, this is just a PC32 reloc.
1414 // Otherwise we need a PLT entry.
1415 if (gsym
->final_value_is_known())
1417 // If building a shared library, we can also skip the PLT entry
1418 // if the symbol is defined in the output file and is protected
1420 if (gsym
->is_defined()
1421 && !gsym
->is_from_dynobj()
1422 && !gsym
->is_preemptible())
1424 target
->make_plt_entry(symtab
, layout
, gsym
);
1427 case elfcpp::R_X86_64_GOTPC32
:
1428 case elfcpp::R_X86_64_GOTOFF64
:
1429 case elfcpp::R_X86_64_GOTPC64
:
1430 case elfcpp::R_X86_64_PLTOFF64
:
1431 // We need a GOT section.
1432 target
->got_section(symtab
, layout
);
1433 // For PLTOFF64, we also need a PLT entry (but only if the
1434 // symbol is not fully resolved).
1435 if (r_type
== elfcpp::R_X86_64_PLTOFF64
1436 && !gsym
->final_value_is_known())
1437 target
->make_plt_entry(symtab
, layout
, gsym
);
1440 case elfcpp::R_X86_64_COPY
:
1441 case elfcpp::R_X86_64_GLOB_DAT
:
1442 case elfcpp::R_X86_64_JUMP_SLOT
:
1443 case elfcpp::R_X86_64_RELATIVE
:
1444 // These are outstanding tls relocs, which are unexpected when linking
1445 case elfcpp::R_X86_64_TPOFF64
:
1446 case elfcpp::R_X86_64_DTPMOD64
:
1447 case elfcpp::R_X86_64_TLSDESC
:
1448 gold_error(_("%s: unexpected reloc %u in object file"),
1449 object
->name().c_str(), r_type
);
1452 // These are initial tls relocs, which are expected for global()
1453 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1454 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1455 case elfcpp::R_X86_64_TLSDESC_CALL
:
1456 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1457 case elfcpp::R_X86_64_DTPOFF32
:
1458 case elfcpp::R_X86_64_DTPOFF64
:
1459 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1460 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1462 const bool is_final
= gsym
->final_value_is_known();
1463 const tls::Tls_optimization optimized_type
1464 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1467 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1468 if (optimized_type
== tls::TLSOPT_NONE
)
1470 // Create a pair of GOT entries for the module index and
1471 // dtv-relative offset.
1472 Output_data_got
<64, false>* got
1473 = target
->got_section(symtab
, layout
);
1474 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_PAIR
,
1475 target
->rela_dyn_section(layout
),
1476 elfcpp::R_X86_64_DTPMOD64
,
1477 elfcpp::R_X86_64_DTPOFF64
);
1479 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1481 // Create a GOT entry for the tp-relative offset.
1482 Output_data_got
<64, false>* got
1483 = target
->got_section(symtab
, layout
);
1484 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1485 target
->rela_dyn_section(layout
),
1486 elfcpp::R_X86_64_TPOFF64
);
1488 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1489 unsupported_reloc_global(object
, r_type
, gsym
);
1492 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1493 target
->define_tls_base_symbol(symtab
, layout
);
1494 if (optimized_type
== tls::TLSOPT_NONE
)
1496 // Create reserved PLT and GOT entries for the resolver.
1497 target
->reserve_tlsdesc_entries(symtab
, layout
);
1499 // Create a double GOT entry with an R_X86_64_TLSDESC reloc.
1500 Output_data_got
<64, false>* got
1501 = target
->got_section(symtab
, layout
);
1502 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_DESC
,
1503 target
->rela_dyn_section(layout
),
1504 elfcpp::R_X86_64_TLSDESC
, 0);
1506 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1508 // Create a GOT entry for the tp-relative offset.
1509 Output_data_got
<64, false>* got
1510 = target
->got_section(symtab
, layout
);
1511 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1512 target
->rela_dyn_section(layout
),
1513 elfcpp::R_X86_64_TPOFF64
);
1515 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1516 unsupported_reloc_global(object
, r_type
, gsym
);
1519 case elfcpp::R_X86_64_TLSDESC_CALL
:
1522 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1523 if (optimized_type
== tls::TLSOPT_NONE
)
1525 // Create a GOT entry for the module index.
1526 target
->got_mod_index_entry(symtab
, layout
, object
);
1528 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1529 unsupported_reloc_global(object
, r_type
, gsym
);
1532 case elfcpp::R_X86_64_DTPOFF32
:
1533 case elfcpp::R_X86_64_DTPOFF64
:
1536 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1537 layout
->set_has_static_tls();
1538 if (optimized_type
== tls::TLSOPT_NONE
)
1540 // Create a GOT entry for the tp-relative offset.
1541 Output_data_got
<64, false>* got
1542 = target
->got_section(symtab
, layout
);
1543 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1544 target
->rela_dyn_section(layout
),
1545 elfcpp::R_X86_64_TPOFF64
);
1547 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1548 unsupported_reloc_global(object
, r_type
, gsym
);
1551 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1552 layout
->set_has_static_tls();
1553 if (parameters
->options().shared())
1554 unsupported_reloc_local(object
, r_type
);
1563 case elfcpp::R_X86_64_SIZE32
:
1564 case elfcpp::R_X86_64_SIZE64
:
1566 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1567 object
->name().c_str(), r_type
,
1568 gsym
->demangled_name().c_str());
1574 Target_x86_64::gc_process_relocs(Symbol_table
* symtab
,
1576 Sized_relobj
<64, false>* object
,
1577 unsigned int data_shndx
,
1578 unsigned int sh_type
,
1579 const unsigned char* prelocs
,
1581 Output_section
* output_section
,
1582 bool needs_special_offset_handling
,
1583 size_t local_symbol_count
,
1584 const unsigned char* plocal_symbols
)
1587 if (sh_type
== elfcpp::SHT_REL
)
1592 gold::gc_process_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1593 Target_x86_64::Scan
>(
1602 needs_special_offset_handling
,
1607 // Scan relocations for a section.
1610 Target_x86_64::scan_relocs(Symbol_table
* symtab
,
1612 Sized_relobj
<64, false>* object
,
1613 unsigned int data_shndx
,
1614 unsigned int sh_type
,
1615 const unsigned char* prelocs
,
1617 Output_section
* output_section
,
1618 bool needs_special_offset_handling
,
1619 size_t local_symbol_count
,
1620 const unsigned char* plocal_symbols
)
1622 if (sh_type
== elfcpp::SHT_REL
)
1624 gold_error(_("%s: unsupported REL reloc section"),
1625 object
->name().c_str());
1629 gold::scan_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1630 Target_x86_64::Scan
>(
1639 needs_special_offset_handling
,
1644 // Finalize the sections.
1647 Target_x86_64::do_finalize_sections(
1649 const Input_objects
*,
1652 // Fill in some more dynamic tags.
1653 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1656 if (this->got_plt_
!= NULL
1657 && this->got_plt_
->output_section() != NULL
)
1658 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1660 if (this->plt_
!= NULL
1661 && this->plt_
->output_section() != NULL
)
1663 const Output_data
* od
= this->plt_
->rel_plt();
1664 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1665 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1666 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_RELA
);
1667 if (this->plt_
->has_tlsdesc_entry())
1669 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
1670 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
1671 this->got_
->finalize_data_size();
1672 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
1673 this->plt_
, plt_offset
);
1674 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
1675 this->got_
, got_offset
);
1679 if (this->rela_dyn_
!= NULL
1680 && this->rela_dyn_
->output_section() != NULL
)
1682 const Output_data
* od
= this->rela_dyn_
;
1683 odyn
->add_section_address(elfcpp::DT_RELA
, od
);
1684 odyn
->add_section_size(elfcpp::DT_RELASZ
, od
);
1685 odyn
->add_constant(elfcpp::DT_RELAENT
,
1686 elfcpp::Elf_sizes
<64>::rela_size
);
1689 if (!parameters
->options().shared())
1691 // The value of the DT_DEBUG tag is filled in by the dynamic
1692 // linker at run time, and used by the debugger.
1693 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1697 // Emit any relocs we saved in an attempt to avoid generating COPY
1699 if (this->copy_relocs_
.any_saved_relocs())
1700 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
1703 // Perform a relocation.
1706 Target_x86_64::Relocate::relocate(const Relocate_info
<64, false>* relinfo
,
1707 Target_x86_64
* target
,
1710 const elfcpp::Rela
<64, false>& rela
,
1711 unsigned int r_type
,
1712 const Sized_symbol
<64>* gsym
,
1713 const Symbol_value
<64>* psymval
,
1714 unsigned char* view
,
1715 elfcpp::Elf_types
<64>::Elf_Addr address
,
1716 section_size_type view_size
)
1718 if (this->skip_call_tls_get_addr_
)
1720 if ((r_type
!= elfcpp::R_X86_64_PLT32
1721 && r_type
!= elfcpp::R_X86_64_PC32
)
1723 || strcmp(gsym
->name(), "__tls_get_addr") != 0)
1725 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1726 _("missing expected TLS relocation"));
1730 this->skip_call_tls_get_addr_
= false;
1735 // Pick the value to use for symbols defined in shared objects.
1736 Symbol_value
<64> symval
;
1738 && gsym
->use_plt_offset(r_type
== elfcpp::R_X86_64_PC64
1739 || r_type
== elfcpp::R_X86_64_PC32
1740 || r_type
== elfcpp::R_X86_64_PC16
1741 || r_type
== elfcpp::R_X86_64_PC8
))
1743 symval
.set_output_value(target
->plt_section()->address()
1744 + gsym
->plt_offset());
1748 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1749 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1751 // Get the GOT offset if needed.
1752 // The GOT pointer points to the end of the GOT section.
1753 // We need to subtract the size of the GOT section to get
1754 // the actual offset to use in the relocation.
1755 bool have_got_offset
= false;
1756 unsigned int got_offset
= 0;
1759 case elfcpp::R_X86_64_GOT32
:
1760 case elfcpp::R_X86_64_GOT64
:
1761 case elfcpp::R_X86_64_GOTPLT64
:
1762 case elfcpp::R_X86_64_GOTPCREL
:
1763 case elfcpp::R_X86_64_GOTPCREL64
:
1766 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1767 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - target
->got_size();
1771 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
1772 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1773 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1774 - target
->got_size());
1776 have_got_offset
= true;
1785 case elfcpp::R_X86_64_NONE
:
1786 case elfcpp::R_386_GNU_VTINHERIT
:
1787 case elfcpp::R_386_GNU_VTENTRY
:
1790 case elfcpp::R_X86_64_64
:
1791 Relocate_functions
<64, false>::rela64(view
, object
, psymval
, addend
);
1794 case elfcpp::R_X86_64_PC64
:
1795 Relocate_functions
<64, false>::pcrela64(view
, object
, psymval
, addend
,
1799 case elfcpp::R_X86_64_32
:
1800 // FIXME: we need to verify that value + addend fits into 32 bits:
1801 // uint64_t x = value + addend;
1802 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
1803 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
1804 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1807 case elfcpp::R_X86_64_32S
:
1808 // FIXME: we need to verify that value + addend fits into 32 bits:
1809 // int64_t x = value + addend; // note this quantity is signed!
1810 // x == static_cast<int64_t>(static_cast<int32_t>(x))
1811 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1814 case elfcpp::R_X86_64_PC32
:
1815 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1819 case elfcpp::R_X86_64_16
:
1820 Relocate_functions
<64, false>::rela16(view
, object
, psymval
, addend
);
1823 case elfcpp::R_X86_64_PC16
:
1824 Relocate_functions
<64, false>::pcrela16(view
, object
, psymval
, addend
,
1828 case elfcpp::R_X86_64_8
:
1829 Relocate_functions
<64, false>::rela8(view
, object
, psymval
, addend
);
1832 case elfcpp::R_X86_64_PC8
:
1833 Relocate_functions
<64, false>::pcrela8(view
, object
, psymval
, addend
,
1837 case elfcpp::R_X86_64_PLT32
:
1838 gold_assert(gsym
== NULL
1839 || gsym
->has_plt_offset()
1840 || gsym
->final_value_is_known()
1841 || (gsym
->is_defined()
1842 && !gsym
->is_from_dynobj()
1843 && !gsym
->is_preemptible()));
1844 // Note: while this code looks the same as for R_X86_64_PC32, it
1845 // behaves differently because psymval was set to point to
1846 // the PLT entry, rather than the symbol, in Scan::global().
1847 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1851 case elfcpp::R_X86_64_PLTOFF64
:
1854 gold_assert(gsym
->has_plt_offset()
1855 || gsym
->final_value_is_known());
1856 elfcpp::Elf_types
<64>::Elf_Addr got_address
;
1857 got_address
= target
->got_section(NULL
, NULL
)->address();
1858 Relocate_functions
<64, false>::rela64(view
, object
, psymval
,
1859 addend
- got_address
);
1862 case elfcpp::R_X86_64_GOT32
:
1863 gold_assert(have_got_offset
);
1864 Relocate_functions
<64, false>::rela32(view
, got_offset
, addend
);
1867 case elfcpp::R_X86_64_GOTPC32
:
1870 elfcpp::Elf_types
<64>::Elf_Addr value
;
1871 value
= target
->got_plt_section()->address();
1872 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1876 case elfcpp::R_X86_64_GOT64
:
1877 // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
1878 // Since we always add a PLT entry, this is equivalent.
1879 case elfcpp::R_X86_64_GOTPLT64
:
1880 gold_assert(have_got_offset
);
1881 Relocate_functions
<64, false>::rela64(view
, got_offset
, addend
);
1884 case elfcpp::R_X86_64_GOTPC64
:
1887 elfcpp::Elf_types
<64>::Elf_Addr value
;
1888 value
= target
->got_plt_section()->address();
1889 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1893 case elfcpp::R_X86_64_GOTOFF64
:
1895 elfcpp::Elf_types
<64>::Elf_Addr value
;
1896 value
= (psymval
->value(object
, 0)
1897 - target
->got_plt_section()->address());
1898 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
1902 case elfcpp::R_X86_64_GOTPCREL
:
1904 gold_assert(have_got_offset
);
1905 elfcpp::Elf_types
<64>::Elf_Addr value
;
1906 value
= target
->got_plt_section()->address() + got_offset
;
1907 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1911 case elfcpp::R_X86_64_GOTPCREL64
:
1913 gold_assert(have_got_offset
);
1914 elfcpp::Elf_types
<64>::Elf_Addr value
;
1915 value
= target
->got_plt_section()->address() + got_offset
;
1916 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1920 case elfcpp::R_X86_64_COPY
:
1921 case elfcpp::R_X86_64_GLOB_DAT
:
1922 case elfcpp::R_X86_64_JUMP_SLOT
:
1923 case elfcpp::R_X86_64_RELATIVE
:
1924 // These are outstanding tls relocs, which are unexpected when linking
1925 case elfcpp::R_X86_64_TPOFF64
:
1926 case elfcpp::R_X86_64_DTPMOD64
:
1927 case elfcpp::R_X86_64_TLSDESC
:
1928 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1929 _("unexpected reloc %u in object file"),
1933 // These are initial tls relocs, which are expected when linking
1934 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1935 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1936 case elfcpp::R_X86_64_TLSDESC_CALL
:
1937 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1938 case elfcpp::R_X86_64_DTPOFF32
:
1939 case elfcpp::R_X86_64_DTPOFF64
:
1940 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1941 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1942 this->relocate_tls(relinfo
, target
, relnum
, rela
, r_type
, gsym
, psymval
,
1943 view
, address
, view_size
);
1946 case elfcpp::R_X86_64_SIZE32
:
1947 case elfcpp::R_X86_64_SIZE64
:
1949 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1950 _("unsupported reloc %u"),
1958 // Perform a TLS relocation.
1961 Target_x86_64::Relocate::relocate_tls(const Relocate_info
<64, false>* relinfo
,
1962 Target_x86_64
* target
,
1964 const elfcpp::Rela
<64, false>& rela
,
1965 unsigned int r_type
,
1966 const Sized_symbol
<64>* gsym
,
1967 const Symbol_value
<64>* psymval
,
1968 unsigned char* view
,
1969 elfcpp::Elf_types
<64>::Elf_Addr address
,
1970 section_size_type view_size
)
1972 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1974 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1975 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1977 elfcpp::Elf_types
<64>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
1979 const bool is_final
= (gsym
== NULL
1980 ? !parameters
->options().output_is_position_independent()
1981 : gsym
->final_value_is_known());
1982 const tls::Tls_optimization optimized_type
1983 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1986 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1987 this->saw_tls_block_reloc_
= true;
1988 if (optimized_type
== tls::TLSOPT_TO_LE
)
1990 gold_assert(tls_segment
!= NULL
);
1991 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1992 rela
, r_type
, value
, view
,
1998 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
1999 ? GOT_TYPE_TLS_OFFSET
2000 : GOT_TYPE_TLS_PAIR
);
2001 unsigned int got_offset
;
2004 gold_assert(gsym
->has_got_offset(got_type
));
2005 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2009 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2010 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2011 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2012 - target
->got_size());
2014 if (optimized_type
== tls::TLSOPT_TO_IE
)
2016 gold_assert(tls_segment
!= NULL
);
2017 value
= target
->got_plt_section()->address() + got_offset
;
2018 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rela
, r_type
,
2019 value
, view
, address
, view_size
);
2022 else if (optimized_type
== tls::TLSOPT_NONE
)
2024 // Relocate the field with the offset of the pair of GOT
2026 value
= target
->got_plt_section()->address() + got_offset
;
2027 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2032 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2033 _("unsupported reloc %u"), r_type
);
2036 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2037 case elfcpp::R_X86_64_TLSDESC_CALL
:
2038 this->saw_tls_block_reloc_
= true;
2039 if (optimized_type
== tls::TLSOPT_TO_LE
)
2041 gold_assert(tls_segment
!= NULL
);
2042 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
2043 rela
, r_type
, value
, view
,
2049 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2050 ? GOT_TYPE_TLS_OFFSET
2051 : GOT_TYPE_TLS_DESC
);
2052 unsigned int got_offset
;
2055 gold_assert(gsym
->has_got_offset(got_type
));
2056 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2060 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2061 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2062 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2063 - target
->got_size());
2065 if (optimized_type
== tls::TLSOPT_TO_IE
)
2067 gold_assert(tls_segment
!= NULL
);
2068 value
= target
->got_plt_section()->address() + got_offset
;
2069 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
,
2070 rela
, r_type
, value
, view
, address
,
2074 else if (optimized_type
== tls::TLSOPT_NONE
)
2076 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2078 // Relocate the field with the offset of the pair of GOT
2080 value
= target
->got_plt_section()->address() + got_offset
;
2081 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2087 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2088 _("unsupported reloc %u"), r_type
);
2091 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2092 this->saw_tls_block_reloc_
= true;
2093 if (optimized_type
== tls::TLSOPT_TO_LE
)
2095 gold_assert(tls_segment
!= NULL
);
2096 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rela
, r_type
,
2097 value
, view
, view_size
);
2100 else if (optimized_type
== tls::TLSOPT_NONE
)
2102 // Relocate the field with the offset of the GOT entry for
2103 // the module index.
2104 unsigned int got_offset
;
2105 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2106 - target
->got_size());
2107 value
= target
->got_plt_section()->address() + got_offset
;
2108 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2112 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2113 _("unsupported reloc %u"), r_type
);
2116 case elfcpp::R_X86_64_DTPOFF32
:
2117 if (optimized_type
== tls::TLSOPT_TO_LE
)
2119 // This relocation type is used in debugging information.
2120 // In that case we need to not optimize the value. If we
2121 // haven't seen a TLSLD reloc, then we assume we should not
2122 // optimize this reloc.
2123 if (this->saw_tls_block_reloc_
)
2125 gold_assert(tls_segment
!= NULL
);
2126 value
-= tls_segment
->memsz();
2129 Relocate_functions
<64, false>::rela32(view
, value
, addend
);
2132 case elfcpp::R_X86_64_DTPOFF64
:
2133 if (optimized_type
== tls::TLSOPT_TO_LE
)
2135 // See R_X86_64_DTPOFF32, just above, for why we test this.
2136 if (this->saw_tls_block_reloc_
)
2138 gold_assert(tls_segment
!= NULL
);
2139 value
-= tls_segment
->memsz();
2142 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
2145 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2146 if (optimized_type
== tls::TLSOPT_TO_LE
)
2148 gold_assert(tls_segment
!= NULL
);
2149 Target_x86_64::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2150 rela
, r_type
, value
, view
,
2154 else if (optimized_type
== tls::TLSOPT_NONE
)
2156 // Relocate the field with the offset of the GOT entry for
2157 // the tp-relative offset of the symbol.
2158 unsigned int got_offset
;
2161 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
));
2162 got_offset
= (gsym
->got_offset(GOT_TYPE_TLS_OFFSET
)
2163 - target
->got_size());
2167 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2168 gold_assert(object
->local_has_got_offset(r_sym
,
2169 GOT_TYPE_TLS_OFFSET
));
2170 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
)
2171 - target
->got_size());
2173 value
= target
->got_plt_section()->address() + got_offset
;
2174 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
2177 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2178 _("unsupported reloc type %u"),
2182 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2183 value
-= tls_segment
->memsz();
2184 Relocate_functions
<64, false>::rela32(view
, value
, addend
);
2189 // Do a relocation in which we convert a TLS General-Dynamic to an
2193 Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info
<64, false>* relinfo
,
2196 const elfcpp::Rela
<64, false>& rela
,
2198 elfcpp::Elf_types
<64>::Elf_Addr value
,
2199 unsigned char* view
,
2200 elfcpp::Elf_types
<64>::Elf_Addr address
,
2201 section_size_type view_size
)
2203 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2204 // .word 0x6666; rex64; call __tls_get_addr
2205 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
2207 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
2208 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
2210 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2211 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
2212 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2213 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
2215 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16);
2217 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
2218 Relocate_functions
<64, false>::pcrela32(view
+ 8, value
, addend
- 8, address
);
2220 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2222 this->skip_call_tls_get_addr_
= true;
2225 // Do a relocation in which we convert a TLS General-Dynamic to a
2229 Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info
<64, false>* relinfo
,
2231 Output_segment
* tls_segment
,
2232 const elfcpp::Rela
<64, false>& rela
,
2234 elfcpp::Elf_types
<64>::Elf_Addr value
,
2235 unsigned char* view
,
2236 section_size_type view_size
)
2238 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2239 // .word 0x6666; rex64; call __tls_get_addr
2240 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
2242 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
2243 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
2245 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2246 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
2247 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2248 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
2250 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
2252 value
-= tls_segment
->memsz();
2253 Relocate_functions
<64, false>::rela32(view
+ 8, value
, 0);
2255 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2257 this->skip_call_tls_get_addr_
= true;
2260 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
2263 Target_x86_64::Relocate::tls_desc_gd_to_ie(
2264 const Relocate_info
<64, false>* relinfo
,
2267 const elfcpp::Rela
<64, false>& rela
,
2268 unsigned int r_type
,
2269 elfcpp::Elf_types
<64>::Elf_Addr value
,
2270 unsigned char* view
,
2271 elfcpp::Elf_types
<64>::Elf_Addr address
,
2272 section_size_type view_size
)
2274 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2276 // leaq foo@tlsdesc(%rip), %rax
2277 // ==> movq foo@gottpoff(%rip), %rax
2278 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2279 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2280 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2281 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
2283 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
2284 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
2288 // call *foo@tlscall(%rax)
2290 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
2291 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
2292 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2293 view
[0] == 0xff && view
[1] == 0x10);
2299 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
2302 Target_x86_64::Relocate::tls_desc_gd_to_le(
2303 const Relocate_info
<64, false>* relinfo
,
2305 Output_segment
* tls_segment
,
2306 const elfcpp::Rela
<64, false>& rela
,
2307 unsigned int r_type
,
2308 elfcpp::Elf_types
<64>::Elf_Addr value
,
2309 unsigned char* view
,
2310 section_size_type view_size
)
2312 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2314 // leaq foo@tlsdesc(%rip), %rax
2315 // ==> movq foo@tpoff, %rax
2316 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2317 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2318 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2319 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
2322 value
-= tls_segment
->memsz();
2323 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2327 // call *foo@tlscall(%rax)
2329 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
2330 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
2331 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2332 view
[0] == 0xff && view
[1] == 0x10);
2339 Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info
<64, false>* relinfo
,
2342 const elfcpp::Rela
<64, false>& rela
,
2344 elfcpp::Elf_types
<64>::Elf_Addr
,
2345 unsigned char* view
,
2346 section_size_type view_size
)
2348 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
2349 // ... leq foo@dtpoff(%rax),%reg
2350 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
2352 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2353 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 9);
2355 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2356 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x3d);
2358 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(), view
[4] == 0xe8);
2360 memcpy(view
- 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
2362 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2364 this->skip_call_tls_get_addr_
= true;
2367 // Do a relocation in which we convert a TLS Initial-Exec to a
2371 Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info
<64, false>* relinfo
,
2373 Output_segment
* tls_segment
,
2374 const elfcpp::Rela
<64, false>& rela
,
2376 elfcpp::Elf_types
<64>::Elf_Addr value
,
2377 unsigned char* view
,
2378 section_size_type view_size
)
2380 // We need to examine the opcodes to figure out which instruction we
2383 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
2384 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
2386 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2387 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2389 unsigned char op1
= view
[-3];
2390 unsigned char op2
= view
[-2];
2391 unsigned char op3
= view
[-1];
2392 unsigned char reg
= op3
>> 3;
2400 view
[-1] = 0xc0 | reg
;
2404 // Special handling for %rsp.
2408 view
[-1] = 0xc0 | reg
;
2416 view
[-1] = 0x80 | reg
| (reg
<< 3);
2419 value
-= tls_segment
->memsz();
2420 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2423 // Relocate section data.
2426 Target_x86_64::relocate_section(
2427 const Relocate_info
<64, false>* relinfo
,
2428 unsigned int sh_type
,
2429 const unsigned char* prelocs
,
2431 Output_section
* output_section
,
2432 bool needs_special_offset_handling
,
2433 unsigned char* view
,
2434 elfcpp::Elf_types
<64>::Elf_Addr address
,
2435 section_size_type view_size
,
2436 const Reloc_symbol_changes
* reloc_symbol_changes
)
2438 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2440 gold::relocate_section
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
2441 Target_x86_64::Relocate
>(
2447 needs_special_offset_handling
,
2451 reloc_symbol_changes
);
2454 // Return the size of a relocation while scanning during a relocatable
2458 Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc(
2459 unsigned int r_type
,
2464 case elfcpp::R_X86_64_NONE
:
2465 case elfcpp::R_386_GNU_VTINHERIT
:
2466 case elfcpp::R_386_GNU_VTENTRY
:
2467 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
2468 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2469 case elfcpp::R_X86_64_TLSDESC_CALL
:
2470 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2471 case elfcpp::R_X86_64_DTPOFF32
:
2472 case elfcpp::R_X86_64_DTPOFF64
:
2473 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2474 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2477 case elfcpp::R_X86_64_64
:
2478 case elfcpp::R_X86_64_PC64
:
2479 case elfcpp::R_X86_64_GOTOFF64
:
2480 case elfcpp::R_X86_64_GOTPC64
:
2481 case elfcpp::R_X86_64_PLTOFF64
:
2482 case elfcpp::R_X86_64_GOT64
:
2483 case elfcpp::R_X86_64_GOTPCREL64
:
2484 case elfcpp::R_X86_64_GOTPCREL
:
2485 case elfcpp::R_X86_64_GOTPLT64
:
2488 case elfcpp::R_X86_64_32
:
2489 case elfcpp::R_X86_64_32S
:
2490 case elfcpp::R_X86_64_PC32
:
2491 case elfcpp::R_X86_64_PLT32
:
2492 case elfcpp::R_X86_64_GOTPC32
:
2493 case elfcpp::R_X86_64_GOT32
:
2496 case elfcpp::R_X86_64_16
:
2497 case elfcpp::R_X86_64_PC16
:
2500 case elfcpp::R_X86_64_8
:
2501 case elfcpp::R_X86_64_PC8
:
2504 case elfcpp::R_X86_64_COPY
:
2505 case elfcpp::R_X86_64_GLOB_DAT
:
2506 case elfcpp::R_X86_64_JUMP_SLOT
:
2507 case elfcpp::R_X86_64_RELATIVE
:
2508 // These are outstanding tls relocs, which are unexpected when linking
2509 case elfcpp::R_X86_64_TPOFF64
:
2510 case elfcpp::R_X86_64_DTPMOD64
:
2511 case elfcpp::R_X86_64_TLSDESC
:
2512 object
->error(_("unexpected reloc %u in object file"), r_type
);
2515 case elfcpp::R_X86_64_SIZE32
:
2516 case elfcpp::R_X86_64_SIZE64
:
2518 object
->error(_("unsupported reloc %u against local symbol"), r_type
);
2523 // Scan the relocs during a relocatable link.
2526 Target_x86_64::scan_relocatable_relocs(Symbol_table
* symtab
,
2528 Sized_relobj
<64, false>* object
,
2529 unsigned int data_shndx
,
2530 unsigned int sh_type
,
2531 const unsigned char* prelocs
,
2533 Output_section
* output_section
,
2534 bool needs_special_offset_handling
,
2535 size_t local_symbol_count
,
2536 const unsigned char* plocal_symbols
,
2537 Relocatable_relocs
* rr
)
2539 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2541 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
2542 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2544 gold::scan_relocatable_relocs
<64, false, elfcpp::SHT_RELA
,
2545 Scan_relocatable_relocs
>(
2553 needs_special_offset_handling
,
2559 // Relocate a section during a relocatable link.
2562 Target_x86_64::relocate_for_relocatable(
2563 const Relocate_info
<64, false>* relinfo
,
2564 unsigned int sh_type
,
2565 const unsigned char* prelocs
,
2567 Output_section
* output_section
,
2568 off_t offset_in_output_section
,
2569 const Relocatable_relocs
* rr
,
2570 unsigned char* view
,
2571 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
2572 section_size_type view_size
,
2573 unsigned char* reloc_view
,
2574 section_size_type reloc_view_size
)
2576 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2578 gold::relocate_for_relocatable
<64, false, elfcpp::SHT_RELA
>(
2583 offset_in_output_section
,
2592 // Return the value to use for a dynamic which requires special
2593 // treatment. This is how we support equality comparisons of function
2594 // pointers across shared library boundaries, as described in the
2595 // processor specific ABI supplement.
2598 Target_x86_64::do_dynsym_value(const Symbol
* gsym
) const
2600 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2601 return this->plt_section()->address() + gsym
->plt_offset();
2604 // Return a string used to fill a code section with nops to take up
2605 // the specified length.
2608 Target_x86_64::do_code_fill(section_size_type length
) const
2612 // Build a jmpq instruction to skip over the bytes.
2613 unsigned char jmp
[5];
2615 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2616 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2617 + std::string(length
- 5, '\0'));
2620 // Nop sequences of various lengths.
2621 const char nop1
[1] = { 0x90 }; // nop
2622 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2623 const char nop3
[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax)
2624 const char nop4
[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax)
2625 const char nop5
[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1)
2627 const char nop6
[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1)
2629 const char nop7
[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax)
2631 const char nop8
[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1)
2632 0x00, 0x00, 0x00, 0x00 };
2633 const char nop9
[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1)
2634 0x00, 0x00, 0x00, 0x00,
2636 const char nop10
[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1)
2637 0x84, 0x00, 0x00, 0x00,
2639 const char nop11
[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16
2640 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2642 const char nop12
[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16
2643 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1)
2644 0x00, 0x00, 0x00, 0x00 };
2645 const char nop13
[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2646 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1)
2647 0x00, 0x00, 0x00, 0x00,
2649 const char nop14
[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2650 0x66, 0x2e, 0x0f, 0x1f, // data16
2651 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2653 const char nop15
[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2654 0x66, 0x66, 0x2e, 0x0f, // data16; data16
2655 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2658 const char* nops
[16] = {
2660 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2661 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2664 return std::string(nops
[length
], length
);
2667 // FNOFFSET in section SHNDX in OBJECT is the start of a function
2668 // compiled with -fstack-split. The function calls non-stack-split
2669 // code. We have to change the function so that it always ensures
2670 // that it has enough stack space to run some random function.
2673 Target_x86_64::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
2674 section_offset_type fnoffset
,
2675 section_size_type fnsize
,
2676 unsigned char* view
,
2677 section_size_type view_size
,
2679 std::string
* to
) const
2681 // The function starts with a comparison of the stack pointer and a
2682 // field in the TCB. This is followed by a jump.
2685 if (this->match_view(view
, view_size
, fnoffset
, "\x64\x48\x3b\x24\x25", 5)
2688 // We will call __morestack if the carry flag is set after this
2689 // comparison. We turn the comparison into an stc instruction
2691 view
[fnoffset
] = '\xf9';
2692 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 8);
2694 // lea NN(%rsp),%r10
2695 else if (this->match_view(view
, view_size
, fnoffset
, "\x4c\x8d\x94\x24", 4)
2698 // This is loading an offset from the stack pointer for a
2699 // comparison. The offset is negative, so we decrease the
2700 // offset by the amount of space we need for the stack. This
2701 // means we will avoid calling __morestack if there happens to
2702 // be plenty of space on the stack already.
2703 unsigned char* pval
= view
+ fnoffset
+ 4;
2704 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
2705 val
-= parameters
->options().split_stack_adjust_size();
2706 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
2710 if (!object
->has_no_split_stack())
2711 object
->error(_("failed to match split-stack sequence at "
2712 "section %u offset %0zx"),
2713 shndx
, static_cast<size_t>(fnoffset
));
2717 // We have to change the function so that it calls
2718 // __morestack_non_split instead of __morestack. The former will
2719 // allocate additional stack space.
2720 *from
= "__morestack";
2721 *to
= "__morestack_non_split";
2724 // The selector for x86_64 object files.
2726 class Target_selector_x86_64
: public Target_selector_freebsd
2729 Target_selector_x86_64()
2730 : Target_selector_freebsd(elfcpp::EM_X86_64
, 64, false, "elf64-x86-64",
2731 "elf64-x86-64-freebsd")
2735 do_instantiate_target()
2736 { return new Target_x86_64(); }
2740 Target_selector_x86_64 target_selector_x86_64
;
2742 } // End anonymous namespace.