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
),
472 this->got_
, false, true, true,
475 this->got_plt_
= new Output_data_space(8, "** GOT PLT");
476 os
= layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
478 | elfcpp::SHF_WRITE
),
479 this->got_plt_
, false, false,
482 // The first three entries are reserved.
483 this->got_plt_
->set_current_data_size(3 * 8);
485 // Those bytes can go into the relro segment.
486 layout
->increase_relro(3 * 8);
488 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
489 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
490 Symbol_table::PREDEFINED
,
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,
512 false, false, false);
514 return this->rela_dyn_
;
517 // A class to handle the PLT data.
519 class Output_data_plt_x86_64
: public Output_section_data
522 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false> Reloc_section
;
524 Output_data_plt_x86_64(Layout
*, Output_data_got
<64, false>*,
527 // Add an entry to the PLT.
529 add_entry(Symbol
* gsym
);
531 // Add the reserved TLSDESC_PLT entry to the PLT.
533 reserve_tlsdesc_entry(unsigned int got_offset
)
534 { this->tlsdesc_got_offset_
= got_offset
; }
536 // Return true if a TLSDESC_PLT entry has been reserved.
538 has_tlsdesc_entry() const
539 { return this->tlsdesc_got_offset_
!= -1U; }
541 // Return the GOT offset for the reserved TLSDESC_PLT entry.
543 get_tlsdesc_got_offset() const
544 { return this->tlsdesc_got_offset_
; }
546 // Return the offset of the reserved TLSDESC_PLT entry.
548 get_tlsdesc_plt_offset() const
549 { return (this->count_
+ 1) * plt_entry_size
; }
551 // Return the .rel.plt section data.
554 { return this->rel_
; }
558 do_adjust_output_section(Output_section
* os
);
560 // Write to a map file.
562 do_print_to_mapfile(Mapfile
* mapfile
) const
563 { mapfile
->print_output_data(this, _("** PLT")); }
566 // The size of an entry in the PLT.
567 static const int plt_entry_size
= 16;
569 // The first entry in the PLT.
570 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
571 // procedure linkage table for both programs and shared objects."
572 static unsigned char first_plt_entry
[plt_entry_size
];
574 // Other entries in the PLT for an executable.
575 static unsigned char plt_entry
[plt_entry_size
];
577 // The reserved TLSDESC entry in the PLT for an executable.
578 static unsigned char tlsdesc_plt_entry
[plt_entry_size
];
580 // Set the final size.
582 set_final_data_size();
584 // Write out the PLT data.
586 do_write(Output_file
*);
588 // The reloc section.
591 Output_data_got
<64, false>* got_
;
592 // The .got.plt section.
593 Output_data_space
* got_plt_
;
594 // The number of PLT entries.
596 // Offset of the reserved TLSDESC_GOT entry when needed.
597 unsigned int tlsdesc_got_offset_
;
600 // Create the PLT section. The ordinary .got section is an argument,
601 // since we need to refer to the start. We also create our own .got
602 // section just for PLT entries.
604 Output_data_plt_x86_64::Output_data_plt_x86_64(Layout
* layout
,
605 Output_data_got
<64, false>* got
,
606 Output_data_space
* got_plt
)
607 : Output_section_data(8), got_(got
), got_plt_(got_plt
), count_(0),
608 tlsdesc_got_offset_(-1U)
610 this->rel_
= new Reloc_section(false);
611 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
612 elfcpp::SHF_ALLOC
, this->rel_
, true,
613 false, false, false);
617 Output_data_plt_x86_64::do_adjust_output_section(Output_section
* os
)
619 os
->set_entsize(plt_entry_size
);
622 // Add an entry to the PLT.
625 Output_data_plt_x86_64::add_entry(Symbol
* gsym
)
627 gold_assert(!gsym
->has_plt_offset());
629 // Note that when setting the PLT offset we skip the initial
630 // reserved PLT entry.
631 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
635 section_offset_type got_offset
= this->got_plt_
->current_data_size();
637 // Every PLT entry needs a GOT entry which points back to the PLT
638 // entry (this will be changed by the dynamic linker, normally
639 // lazily when the function is called).
640 this->got_plt_
->set_current_data_size(got_offset
+ 8);
642 // Every PLT entry needs a reloc.
643 gsym
->set_needs_dynsym_entry();
644 this->rel_
->add_global(gsym
, elfcpp::R_X86_64_JUMP_SLOT
, this->got_plt_
,
647 // Note that we don't need to save the symbol. The contents of the
648 // PLT are independent of which symbols are used. The symbols only
649 // appear in the relocations.
652 // Set the final size.
654 Output_data_plt_x86_64::set_final_data_size()
656 unsigned int count
= this->count_
;
657 if (this->has_tlsdesc_entry())
659 this->set_data_size((count
+ 1) * plt_entry_size
);
662 // The first entry in the PLT for an executable.
664 unsigned char Output_data_plt_x86_64::first_plt_entry
[plt_entry_size
] =
666 // From AMD64 ABI Draft 0.98, page 76
667 0xff, 0x35, // pushq contents of memory address
668 0, 0, 0, 0, // replaced with address of .got + 8
669 0xff, 0x25, // jmp indirect
670 0, 0, 0, 0, // replaced with address of .got + 16
671 0x90, 0x90, 0x90, 0x90 // noop (x4)
674 // Subsequent entries in the PLT for an executable.
676 unsigned char Output_data_plt_x86_64::plt_entry
[plt_entry_size
] =
678 // From AMD64 ABI Draft 0.98, page 76
679 0xff, 0x25, // jmpq indirect
680 0, 0, 0, 0, // replaced with address of symbol in .got
681 0x68, // pushq immediate
682 0, 0, 0, 0, // replaced with offset into relocation table
683 0xe9, // jmpq relative
684 0, 0, 0, 0 // replaced with offset to start of .plt
687 // The reserved TLSDESC entry in the PLT for an executable.
689 unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry
[plt_entry_size
] =
691 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
692 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
693 0xff, 0x35, // pushq x(%rip)
694 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
695 0xff, 0x25, // jmpq *y(%rip)
696 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
701 // Write out the PLT. This uses the hand-coded instructions above,
702 // and adjusts them as needed. This is specified by the AMD64 ABI.
705 Output_data_plt_x86_64::do_write(Output_file
* of
)
707 const off_t offset
= this->offset();
708 const section_size_type oview_size
=
709 convert_to_section_size_type(this->data_size());
710 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
712 const off_t got_file_offset
= this->got_plt_
->offset();
713 const section_size_type got_size
=
714 convert_to_section_size_type(this->got_plt_
->data_size());
715 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
718 unsigned char* pov
= oview
;
720 // The base address of the .plt section.
721 elfcpp::Elf_types
<64>::Elf_Addr plt_address
= this->address();
722 // The base address of the .got section.
723 elfcpp::Elf_types
<64>::Elf_Addr got_base
= this->got_
->address();
724 // The base address of the PLT portion of the .got section,
725 // which is where the GOT pointer will point, and where the
726 // three reserved GOT entries are located.
727 elfcpp::Elf_types
<64>::Elf_Addr got_address
= this->got_plt_
->address();
729 memcpy(pov
, first_plt_entry
, plt_entry_size
);
730 // We do a jmp relative to the PC at the end of this instruction.
731 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
733 - (plt_address
+ 6)));
734 elfcpp::Swap
<32, false>::writeval(pov
+ 8,
736 - (plt_address
+ 12)));
737 pov
+= plt_entry_size
;
739 unsigned char* got_pov
= got_view
;
741 memset(got_pov
, 0, 24);
744 unsigned int plt_offset
= plt_entry_size
;
745 unsigned int got_offset
= 24;
746 const unsigned int count
= this->count_
;
747 for (unsigned int plt_index
= 0;
750 pov
+= plt_entry_size
,
752 plt_offset
+= plt_entry_size
,
755 // Set and adjust the PLT entry itself.
756 memcpy(pov
, plt_entry
, plt_entry_size
);
757 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
758 (got_address
+ got_offset
759 - (plt_address
+ plt_offset
762 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_index
);
763 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
764 - (plt_offset
+ plt_entry_size
));
766 // Set the entry in the GOT.
767 elfcpp::Swap
<64, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
770 if (this->has_tlsdesc_entry())
772 // Set and adjust the reserved TLSDESC PLT entry.
773 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
774 memcpy(pov
, tlsdesc_plt_entry
, plt_entry_size
);
775 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
777 - (plt_address
+ plt_offset
779 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 8,
782 - (plt_address
+ plt_offset
784 pov
+= plt_entry_size
;
787 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
788 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
790 of
->write_output_view(offset
, oview_size
, oview
);
791 of
->write_output_view(got_file_offset
, got_size
, got_view
);
794 // Create the PLT section.
797 Target_x86_64::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
799 if (this->plt_
== NULL
)
801 // Create the GOT sections first.
802 this->got_section(symtab
, layout
);
804 this->plt_
= new Output_data_plt_x86_64(layout
, this->got_
,
806 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
808 | elfcpp::SHF_EXECINSTR
),
809 this->plt_
, false, false, false, false);
813 // Create a PLT entry for a global symbol.
816 Target_x86_64::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
819 if (gsym
->has_plt_offset())
822 if (this->plt_
== NULL
)
823 this->make_plt_section(symtab
, layout
);
825 this->plt_
->add_entry(gsym
);
828 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
831 Target_x86_64::define_tls_base_symbol(Symbol_table
* symtab
, Layout
* layout
)
833 if (this->tls_base_symbol_defined_
)
836 Output_segment
* tls_segment
= layout
->tls_segment();
837 if (tls_segment
!= NULL
)
839 bool is_exec
= parameters
->options().output_is_executable();
840 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
841 Symbol_table::PREDEFINED
,
845 elfcpp::STV_HIDDEN
, 0,
847 ? Symbol::SEGMENT_END
848 : Symbol::SEGMENT_START
),
851 this->tls_base_symbol_defined_
= true;
854 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
857 Target_x86_64::reserve_tlsdesc_entries(Symbol_table
* symtab
,
860 if (this->plt_
== NULL
)
861 this->make_plt_section(symtab
, layout
);
863 if (!this->plt_
->has_tlsdesc_entry())
865 // Allocate the TLSDESC_GOT entry.
866 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
867 unsigned int got_offset
= got
->add_constant(0);
869 // Allocate the TLSDESC_PLT entry.
870 this->plt_
->reserve_tlsdesc_entry(got_offset
);
874 // Create a GOT entry for the TLS module index.
877 Target_x86_64::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
878 Sized_relobj
<64, false>* object
)
880 if (this->got_mod_index_offset_
== -1U)
882 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
883 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
884 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
885 unsigned int got_offset
= got
->add_constant(0);
886 rela_dyn
->add_local(object
, 0, elfcpp::R_X86_64_DTPMOD64
, got
,
888 got
->add_constant(0);
889 this->got_mod_index_offset_
= got_offset
;
891 return this->got_mod_index_offset_
;
894 // Optimize the TLS relocation type based on what we know about the
895 // symbol. IS_FINAL is true if the final address of this symbol is
896 // known at link time.
898 tls::Tls_optimization
899 Target_x86_64::optimize_tls_reloc(bool is_final
, int r_type
)
901 // If we are generating a shared library, then we can't do anything
903 if (parameters
->options().shared())
904 return tls::TLSOPT_NONE
;
908 case elfcpp::R_X86_64_TLSGD
:
909 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
910 case elfcpp::R_X86_64_TLSDESC_CALL
:
911 // These are General-Dynamic which permits fully general TLS
912 // access. Since we know that we are generating an executable,
913 // we can convert this to Initial-Exec. If we also know that
914 // this is a local symbol, we can further switch to Local-Exec.
916 return tls::TLSOPT_TO_LE
;
917 return tls::TLSOPT_TO_IE
;
919 case elfcpp::R_X86_64_TLSLD
:
920 // This is Local-Dynamic, which refers to a local symbol in the
921 // dynamic TLS block. Since we know that we generating an
922 // executable, we can switch to Local-Exec.
923 return tls::TLSOPT_TO_LE
;
925 case elfcpp::R_X86_64_DTPOFF32
:
926 case elfcpp::R_X86_64_DTPOFF64
:
927 // Another Local-Dynamic reloc.
928 return tls::TLSOPT_TO_LE
;
930 case elfcpp::R_X86_64_GOTTPOFF
:
931 // These are Initial-Exec relocs which get the thread offset
932 // from the GOT. If we know that we are linking against the
933 // local symbol, we can switch to Local-Exec, which links the
934 // thread offset into the instruction.
936 return tls::TLSOPT_TO_LE
;
937 return tls::TLSOPT_NONE
;
939 case elfcpp::R_X86_64_TPOFF32
:
940 // When we already have Local-Exec, there is nothing further we
942 return tls::TLSOPT_NONE
;
949 // Report an unsupported relocation against a local symbol.
952 Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj
<64, false>* object
,
955 gold_error(_("%s: unsupported reloc %u against local symbol"),
956 object
->name().c_str(), r_type
);
959 // We are about to emit a dynamic relocation of type R_TYPE. If the
960 // dynamic linker does not support it, issue an error. The GNU linker
961 // only issues a non-PIC error for an allocated read-only section.
962 // Here we know the section is allocated, but we don't know that it is
963 // read-only. But we check for all the relocation types which the
964 // glibc dynamic linker supports, so it seems appropriate to issue an
965 // error even if the section is not read-only.
968 Target_x86_64::Scan::check_non_pic(Relobj
* object
, unsigned int r_type
)
972 // These are the relocation types supported by glibc for x86_64.
973 case elfcpp::R_X86_64_RELATIVE
:
974 case elfcpp::R_X86_64_GLOB_DAT
:
975 case elfcpp::R_X86_64_JUMP_SLOT
:
976 case elfcpp::R_X86_64_DTPMOD64
:
977 case elfcpp::R_X86_64_DTPOFF64
:
978 case elfcpp::R_X86_64_TPOFF64
:
979 case elfcpp::R_X86_64_64
:
980 case elfcpp::R_X86_64_32
:
981 case elfcpp::R_X86_64_PC32
:
982 case elfcpp::R_X86_64_COPY
:
986 // This prevents us from issuing more than one error per reloc
987 // section. But we can still wind up issuing more than one
988 // error per object file.
989 if (this->issued_non_pic_error_
)
991 gold_assert(parameters
->options().output_is_position_independent());
992 object
->error(_("requires unsupported dynamic reloc; "
993 "recompile with -fPIC"));
994 this->issued_non_pic_error_
= true;
997 case elfcpp::R_X86_64_NONE
:
1002 // Scan a relocation for a local symbol.
1005 Target_x86_64::Scan::local(Symbol_table
* symtab
,
1007 Target_x86_64
* target
,
1008 Sized_relobj
<64, false>* object
,
1009 unsigned int data_shndx
,
1010 Output_section
* output_section
,
1011 const elfcpp::Rela
<64, false>& reloc
,
1012 unsigned int r_type
,
1013 const elfcpp::Sym
<64, false>& lsym
)
1017 case elfcpp::R_X86_64_NONE
:
1018 case elfcpp::R_386_GNU_VTINHERIT
:
1019 case elfcpp::R_386_GNU_VTENTRY
:
1022 case elfcpp::R_X86_64_64
:
1023 // If building a shared library (or a position-independent
1024 // executable), we need to create a dynamic relocation for this
1025 // location. The relocation applied at link time will apply the
1026 // link-time value, so we flag the location with an
1027 // R_X86_64_RELATIVE relocation so the dynamic loader can
1028 // relocate it easily.
1029 if (parameters
->options().output_is_position_independent())
1031 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1032 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1033 rela_dyn
->add_local_relative(object
, r_sym
,
1034 elfcpp::R_X86_64_RELATIVE
,
1035 output_section
, data_shndx
,
1036 reloc
.get_r_offset(),
1037 reloc
.get_r_addend());
1041 case elfcpp::R_X86_64_32
:
1042 case elfcpp::R_X86_64_32S
:
1043 case elfcpp::R_X86_64_16
:
1044 case elfcpp::R_X86_64_8
:
1045 // If building a shared library (or a position-independent
1046 // executable), we need to create a dynamic relocation for this
1047 // location. We can't use an R_X86_64_RELATIVE relocation
1048 // because that is always a 64-bit relocation.
1049 if (parameters
->options().output_is_position_independent())
1051 this->check_non_pic(object
, r_type
);
1053 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1054 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1055 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
1056 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
1057 data_shndx
, reloc
.get_r_offset(),
1058 reloc
.get_r_addend());
1061 gold_assert(lsym
.get_st_value() == 0);
1062 unsigned int shndx
= lsym
.get_st_shndx();
1064 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
1067 object
->error(_("section symbol %u has bad shndx %u"),
1070 rela_dyn
->add_local_section(object
, shndx
,
1071 r_type
, output_section
,
1072 data_shndx
, reloc
.get_r_offset(),
1073 reloc
.get_r_addend());
1078 case elfcpp::R_X86_64_PC64
:
1079 case elfcpp::R_X86_64_PC32
:
1080 case elfcpp::R_X86_64_PC16
:
1081 case elfcpp::R_X86_64_PC8
:
1084 case elfcpp::R_X86_64_PLT32
:
1085 // Since we know this is a local symbol, we can handle this as a
1089 case elfcpp::R_X86_64_GOTPC32
:
1090 case elfcpp::R_X86_64_GOTOFF64
:
1091 case elfcpp::R_X86_64_GOTPC64
:
1092 case elfcpp::R_X86_64_PLTOFF64
:
1093 // We need a GOT section.
1094 target
->got_section(symtab
, layout
);
1095 // For PLTOFF64, we'd normally want a PLT section, but since we
1096 // know this is a local symbol, no PLT is needed.
1099 case elfcpp::R_X86_64_GOT64
:
1100 case elfcpp::R_X86_64_GOT32
:
1101 case elfcpp::R_X86_64_GOTPCREL64
:
1102 case elfcpp::R_X86_64_GOTPCREL
:
1103 case elfcpp::R_X86_64_GOTPLT64
:
1105 // The symbol requires a GOT entry.
1106 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1107 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1108 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
1110 // If we are generating a shared object, we need to add a
1111 // dynamic relocation for this symbol's GOT entry.
1112 if (parameters
->options().output_is_position_independent())
1114 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1115 // R_X86_64_RELATIVE assumes a 64-bit relocation.
1116 if (r_type
!= elfcpp::R_X86_64_GOT32
)
1117 rela_dyn
->add_local_relative(
1118 object
, r_sym
, elfcpp::R_X86_64_RELATIVE
, got
,
1119 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
1122 this->check_non_pic(object
, r_type
);
1124 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
1125 rela_dyn
->add_local(
1126 object
, r_sym
, r_type
, got
,
1127 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
1131 // For GOTPLT64, we'd normally want a PLT section, but since
1132 // we know this is a local symbol, no PLT is needed.
1136 case elfcpp::R_X86_64_COPY
:
1137 case elfcpp::R_X86_64_GLOB_DAT
:
1138 case elfcpp::R_X86_64_JUMP_SLOT
:
1139 case elfcpp::R_X86_64_RELATIVE
:
1140 // These are outstanding tls relocs, which are unexpected when linking
1141 case elfcpp::R_X86_64_TPOFF64
:
1142 case elfcpp::R_X86_64_DTPMOD64
:
1143 case elfcpp::R_X86_64_TLSDESC
:
1144 gold_error(_("%s: unexpected reloc %u in object file"),
1145 object
->name().c_str(), r_type
);
1148 // These are initial tls relocs, which are expected when linking
1149 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1150 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1151 case elfcpp::R_X86_64_TLSDESC_CALL
:
1152 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1153 case elfcpp::R_X86_64_DTPOFF32
:
1154 case elfcpp::R_X86_64_DTPOFF64
:
1155 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1156 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1158 bool output_is_shared
= parameters
->options().shared();
1159 const tls::Tls_optimization optimized_type
1160 = Target_x86_64::optimize_tls_reloc(!output_is_shared
, r_type
);
1163 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1164 if (optimized_type
== tls::TLSOPT_NONE
)
1166 // Create a pair of GOT entries for the module index and
1167 // dtv-relative offset.
1168 Output_data_got
<64, false>* got
1169 = target
->got_section(symtab
, layout
);
1170 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1171 unsigned int shndx
= lsym
.get_st_shndx();
1173 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1175 object
->error(_("local symbol %u has bad shndx %u"),
1178 got
->add_local_pair_with_rela(object
, r_sym
,
1181 target
->rela_dyn_section(layout
),
1182 elfcpp::R_X86_64_DTPMOD64
, 0);
1184 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1185 unsupported_reloc_local(object
, r_type
);
1188 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1189 target
->define_tls_base_symbol(symtab
, layout
);
1190 if (optimized_type
== tls::TLSOPT_NONE
)
1192 // Create reserved PLT and GOT entries for the resolver.
1193 target
->reserve_tlsdesc_entries(symtab
, layout
);
1195 // Generate a double GOT entry with an R_X86_64_TLSDESC reloc.
1196 Output_data_got
<64, false>* got
1197 = target
->got_section(symtab
, layout
);
1198 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1199 unsigned int shndx
= lsym
.get_st_shndx();
1201 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
1203 object
->error(_("local symbol %u has bad shndx %u"),
1206 got
->add_local_pair_with_rela(object
, r_sym
,
1209 target
->rela_dyn_section(layout
),
1210 elfcpp::R_X86_64_TLSDESC
, 0);
1212 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1213 unsupported_reloc_local(object
, r_type
);
1216 case elfcpp::R_X86_64_TLSDESC_CALL
:
1219 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1220 if (optimized_type
== tls::TLSOPT_NONE
)
1222 // Create a GOT entry for the module index.
1223 target
->got_mod_index_entry(symtab
, layout
, object
);
1225 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1226 unsupported_reloc_local(object
, r_type
);
1229 case elfcpp::R_X86_64_DTPOFF32
:
1230 case elfcpp::R_X86_64_DTPOFF64
:
1233 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1234 layout
->set_has_static_tls();
1235 if (optimized_type
== tls::TLSOPT_NONE
)
1237 // Create a GOT entry for the tp-relative offset.
1238 Output_data_got
<64, false>* got
1239 = target
->got_section(symtab
, layout
);
1240 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1241 got
->add_local_with_rela(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
1242 target
->rela_dyn_section(layout
),
1243 elfcpp::R_X86_64_TPOFF64
);
1245 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1246 unsupported_reloc_local(object
, r_type
);
1249 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1250 layout
->set_has_static_tls();
1251 if (output_is_shared
)
1252 unsupported_reloc_local(object
, r_type
);
1261 case elfcpp::R_X86_64_SIZE32
:
1262 case elfcpp::R_X86_64_SIZE64
:
1264 gold_error(_("%s: unsupported reloc %u against local symbol"),
1265 object
->name().c_str(), r_type
);
1271 // Report an unsupported relocation against a global symbol.
1274 Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj
<64, false>* object
,
1275 unsigned int r_type
,
1278 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1279 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1282 // Scan a relocation for a global symbol.
1285 Target_x86_64::Scan::global(Symbol_table
* symtab
,
1287 Target_x86_64
* target
,
1288 Sized_relobj
<64, false>* object
,
1289 unsigned int data_shndx
,
1290 Output_section
* output_section
,
1291 const elfcpp::Rela
<64, false>& reloc
,
1292 unsigned int r_type
,
1297 case elfcpp::R_X86_64_NONE
:
1298 case elfcpp::R_386_GNU_VTINHERIT
:
1299 case elfcpp::R_386_GNU_VTENTRY
:
1302 case elfcpp::R_X86_64_64
:
1303 case elfcpp::R_X86_64_32
:
1304 case elfcpp::R_X86_64_32S
:
1305 case elfcpp::R_X86_64_16
:
1306 case elfcpp::R_X86_64_8
:
1308 // Make a PLT entry if necessary.
1309 if (gsym
->needs_plt_entry())
1311 target
->make_plt_entry(symtab
, layout
, gsym
);
1312 // Since this is not a PC-relative relocation, we may be
1313 // taking the address of a function. In that case we need to
1314 // set the entry in the dynamic symbol table to the address of
1316 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1317 gsym
->set_needs_dynsym_value();
1319 // Make a dynamic relocation if necessary.
1320 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1322 if (gsym
->may_need_copy_reloc())
1324 target
->copy_reloc(symtab
, layout
, object
,
1325 data_shndx
, output_section
, gsym
, reloc
);
1327 else if (r_type
== elfcpp::R_X86_64_64
1328 && gsym
->can_use_relative_reloc(false))
1330 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1331 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_RELATIVE
,
1332 output_section
, object
,
1333 data_shndx
, reloc
.get_r_offset(),
1334 reloc
.get_r_addend());
1338 this->check_non_pic(object
, r_type
);
1339 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1340 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1341 data_shndx
, reloc
.get_r_offset(),
1342 reloc
.get_r_addend());
1348 case elfcpp::R_X86_64_PC64
:
1349 case elfcpp::R_X86_64_PC32
:
1350 case elfcpp::R_X86_64_PC16
:
1351 case elfcpp::R_X86_64_PC8
:
1353 // Make a PLT entry if necessary.
1354 if (gsym
->needs_plt_entry())
1355 target
->make_plt_entry(symtab
, layout
, gsym
);
1356 // Make a dynamic relocation if necessary.
1357 int flags
= Symbol::NON_PIC_REF
;
1358 if (gsym
->is_func())
1359 flags
|= Symbol::FUNCTION_CALL
;
1360 if (gsym
->needs_dynamic_reloc(flags
))
1362 if (gsym
->may_need_copy_reloc())
1364 target
->copy_reloc(symtab
, layout
, object
,
1365 data_shndx
, output_section
, gsym
, reloc
);
1369 this->check_non_pic(object
, r_type
);
1370 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1371 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1372 data_shndx
, reloc
.get_r_offset(),
1373 reloc
.get_r_addend());
1379 case elfcpp::R_X86_64_GOT64
:
1380 case elfcpp::R_X86_64_GOT32
:
1381 case elfcpp::R_X86_64_GOTPCREL64
:
1382 case elfcpp::R_X86_64_GOTPCREL
:
1383 case elfcpp::R_X86_64_GOTPLT64
:
1385 // The symbol requires a GOT entry.
1386 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1387 if (gsym
->final_value_is_known())
1388 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1391 // If this symbol is not fully resolved, we need to add a
1392 // dynamic relocation for it.
1393 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1394 if (gsym
->is_from_dynobj()
1395 || gsym
->is_undefined()
1396 || gsym
->is_preemptible())
1397 got
->add_global_with_rela(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
1398 elfcpp::R_X86_64_GLOB_DAT
);
1401 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1402 rela_dyn
->add_global_relative(
1403 gsym
, elfcpp::R_X86_64_RELATIVE
, got
,
1404 gsym
->got_offset(GOT_TYPE_STANDARD
), 0);
1407 // For GOTPLT64, we also need a PLT entry (but only if the
1408 // symbol is not fully resolved).
1409 if (r_type
== elfcpp::R_X86_64_GOTPLT64
1410 && !gsym
->final_value_is_known())
1411 target
->make_plt_entry(symtab
, layout
, gsym
);
1415 case elfcpp::R_X86_64_PLT32
:
1416 // If the symbol is fully resolved, this is just a PC32 reloc.
1417 // Otherwise we need a PLT entry.
1418 if (gsym
->final_value_is_known())
1420 // If building a shared library, we can also skip the PLT entry
1421 // if the symbol is defined in the output file and is protected
1423 if (gsym
->is_defined()
1424 && !gsym
->is_from_dynobj()
1425 && !gsym
->is_preemptible())
1427 target
->make_plt_entry(symtab
, layout
, gsym
);
1430 case elfcpp::R_X86_64_GOTPC32
:
1431 case elfcpp::R_X86_64_GOTOFF64
:
1432 case elfcpp::R_X86_64_GOTPC64
:
1433 case elfcpp::R_X86_64_PLTOFF64
:
1434 // We need a GOT section.
1435 target
->got_section(symtab
, layout
);
1436 // For PLTOFF64, we also need a PLT entry (but only if the
1437 // symbol is not fully resolved).
1438 if (r_type
== elfcpp::R_X86_64_PLTOFF64
1439 && !gsym
->final_value_is_known())
1440 target
->make_plt_entry(symtab
, layout
, gsym
);
1443 case elfcpp::R_X86_64_COPY
:
1444 case elfcpp::R_X86_64_GLOB_DAT
:
1445 case elfcpp::R_X86_64_JUMP_SLOT
:
1446 case elfcpp::R_X86_64_RELATIVE
:
1447 // These are outstanding tls relocs, which are unexpected when linking
1448 case elfcpp::R_X86_64_TPOFF64
:
1449 case elfcpp::R_X86_64_DTPMOD64
:
1450 case elfcpp::R_X86_64_TLSDESC
:
1451 gold_error(_("%s: unexpected reloc %u in object file"),
1452 object
->name().c_str(), r_type
);
1455 // These are initial tls relocs, which are expected for global()
1456 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1457 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1458 case elfcpp::R_X86_64_TLSDESC_CALL
:
1459 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1460 case elfcpp::R_X86_64_DTPOFF32
:
1461 case elfcpp::R_X86_64_DTPOFF64
:
1462 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1463 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1465 const bool is_final
= gsym
->final_value_is_known();
1466 const tls::Tls_optimization optimized_type
1467 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1470 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1471 if (optimized_type
== tls::TLSOPT_NONE
)
1473 // Create a pair of GOT entries for the module index and
1474 // dtv-relative offset.
1475 Output_data_got
<64, false>* got
1476 = target
->got_section(symtab
, layout
);
1477 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_PAIR
,
1478 target
->rela_dyn_section(layout
),
1479 elfcpp::R_X86_64_DTPMOD64
,
1480 elfcpp::R_X86_64_DTPOFF64
);
1482 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1484 // Create a GOT entry for the tp-relative offset.
1485 Output_data_got
<64, false>* got
1486 = target
->got_section(symtab
, layout
);
1487 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1488 target
->rela_dyn_section(layout
),
1489 elfcpp::R_X86_64_TPOFF64
);
1491 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1492 unsupported_reloc_global(object
, r_type
, gsym
);
1495 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1496 target
->define_tls_base_symbol(symtab
, layout
);
1497 if (optimized_type
== tls::TLSOPT_NONE
)
1499 // Create reserved PLT and GOT entries for the resolver.
1500 target
->reserve_tlsdesc_entries(symtab
, layout
);
1502 // Create a double GOT entry with an R_X86_64_TLSDESC reloc.
1503 Output_data_got
<64, false>* got
1504 = target
->got_section(symtab
, layout
);
1505 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_DESC
,
1506 target
->rela_dyn_section(layout
),
1507 elfcpp::R_X86_64_TLSDESC
, 0);
1509 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1511 // Create a GOT entry for the tp-relative offset.
1512 Output_data_got
<64, false>* got
1513 = target
->got_section(symtab
, layout
);
1514 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1515 target
->rela_dyn_section(layout
),
1516 elfcpp::R_X86_64_TPOFF64
);
1518 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1519 unsupported_reloc_global(object
, r_type
, gsym
);
1522 case elfcpp::R_X86_64_TLSDESC_CALL
:
1525 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1526 if (optimized_type
== tls::TLSOPT_NONE
)
1528 // Create a GOT entry for the module index.
1529 target
->got_mod_index_entry(symtab
, layout
, object
);
1531 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1532 unsupported_reloc_global(object
, r_type
, gsym
);
1535 case elfcpp::R_X86_64_DTPOFF32
:
1536 case elfcpp::R_X86_64_DTPOFF64
:
1539 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1540 layout
->set_has_static_tls();
1541 if (optimized_type
== tls::TLSOPT_NONE
)
1543 // Create a GOT entry for the tp-relative offset.
1544 Output_data_got
<64, false>* got
1545 = target
->got_section(symtab
, layout
);
1546 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1547 target
->rela_dyn_section(layout
),
1548 elfcpp::R_X86_64_TPOFF64
);
1550 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1551 unsupported_reloc_global(object
, r_type
, gsym
);
1554 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1555 layout
->set_has_static_tls();
1556 if (parameters
->options().shared())
1557 unsupported_reloc_local(object
, r_type
);
1566 case elfcpp::R_X86_64_SIZE32
:
1567 case elfcpp::R_X86_64_SIZE64
:
1569 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1570 object
->name().c_str(), r_type
,
1571 gsym
->demangled_name().c_str());
1577 Target_x86_64::gc_process_relocs(Symbol_table
* symtab
,
1579 Sized_relobj
<64, false>* object
,
1580 unsigned int data_shndx
,
1581 unsigned int sh_type
,
1582 const unsigned char* prelocs
,
1584 Output_section
* output_section
,
1585 bool needs_special_offset_handling
,
1586 size_t local_symbol_count
,
1587 const unsigned char* plocal_symbols
)
1590 if (sh_type
== elfcpp::SHT_REL
)
1595 gold::gc_process_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1596 Target_x86_64::Scan
>(
1605 needs_special_offset_handling
,
1610 // Scan relocations for a section.
1613 Target_x86_64::scan_relocs(Symbol_table
* symtab
,
1615 Sized_relobj
<64, false>* object
,
1616 unsigned int data_shndx
,
1617 unsigned int sh_type
,
1618 const unsigned char* prelocs
,
1620 Output_section
* output_section
,
1621 bool needs_special_offset_handling
,
1622 size_t local_symbol_count
,
1623 const unsigned char* plocal_symbols
)
1625 if (sh_type
== elfcpp::SHT_REL
)
1627 gold_error(_("%s: unsupported REL reloc section"),
1628 object
->name().c_str());
1632 gold::scan_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1633 Target_x86_64::Scan
>(
1642 needs_special_offset_handling
,
1647 // Finalize the sections.
1650 Target_x86_64::do_finalize_sections(
1652 const Input_objects
*,
1655 // Fill in some more dynamic tags.
1656 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1659 if (this->got_plt_
!= NULL
1660 && this->got_plt_
->output_section() != NULL
)
1661 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1663 if (this->plt_
!= NULL
1664 && this->plt_
->output_section() != NULL
)
1666 const Output_data
* od
= this->plt_
->rel_plt();
1667 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1668 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1669 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_RELA
);
1670 if (this->plt_
->has_tlsdesc_entry())
1672 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
1673 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
1674 this->got_
->finalize_data_size();
1675 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
1676 this->plt_
, plt_offset
);
1677 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
1678 this->got_
, got_offset
);
1682 if (this->rela_dyn_
!= NULL
1683 && this->rela_dyn_
->output_section() != NULL
)
1685 const Output_data
* od
= this->rela_dyn_
;
1686 odyn
->add_section_address(elfcpp::DT_RELA
, od
);
1687 odyn
->add_section_size(elfcpp::DT_RELASZ
, od
);
1688 odyn
->add_constant(elfcpp::DT_RELAENT
,
1689 elfcpp::Elf_sizes
<64>::rela_size
);
1692 if (!parameters
->options().shared())
1694 // The value of the DT_DEBUG tag is filled in by the dynamic
1695 // linker at run time, and used by the debugger.
1696 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1700 // Emit any relocs we saved in an attempt to avoid generating COPY
1702 if (this->copy_relocs_
.any_saved_relocs())
1703 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
1706 // Perform a relocation.
1709 Target_x86_64::Relocate::relocate(const Relocate_info
<64, false>* relinfo
,
1710 Target_x86_64
* target
,
1713 const elfcpp::Rela
<64, false>& rela
,
1714 unsigned int r_type
,
1715 const Sized_symbol
<64>* gsym
,
1716 const Symbol_value
<64>* psymval
,
1717 unsigned char* view
,
1718 elfcpp::Elf_types
<64>::Elf_Addr address
,
1719 section_size_type view_size
)
1721 if (this->skip_call_tls_get_addr_
)
1723 if ((r_type
!= elfcpp::R_X86_64_PLT32
1724 && r_type
!= elfcpp::R_X86_64_PC32
)
1726 || strcmp(gsym
->name(), "__tls_get_addr") != 0)
1728 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1729 _("missing expected TLS relocation"));
1733 this->skip_call_tls_get_addr_
= false;
1738 // Pick the value to use for symbols defined in shared objects.
1739 Symbol_value
<64> symval
;
1741 && gsym
->use_plt_offset(r_type
== elfcpp::R_X86_64_PC64
1742 || r_type
== elfcpp::R_X86_64_PC32
1743 || r_type
== elfcpp::R_X86_64_PC16
1744 || r_type
== elfcpp::R_X86_64_PC8
))
1746 symval
.set_output_value(target
->plt_section()->address()
1747 + gsym
->plt_offset());
1751 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1752 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1754 // Get the GOT offset if needed.
1755 // The GOT pointer points to the end of the GOT section.
1756 // We need to subtract the size of the GOT section to get
1757 // the actual offset to use in the relocation.
1758 bool have_got_offset
= false;
1759 unsigned int got_offset
= 0;
1762 case elfcpp::R_X86_64_GOT32
:
1763 case elfcpp::R_X86_64_GOT64
:
1764 case elfcpp::R_X86_64_GOTPLT64
:
1765 case elfcpp::R_X86_64_GOTPCREL
:
1766 case elfcpp::R_X86_64_GOTPCREL64
:
1769 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1770 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - target
->got_size();
1774 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
1775 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1776 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1777 - target
->got_size());
1779 have_got_offset
= true;
1788 case elfcpp::R_X86_64_NONE
:
1789 case elfcpp::R_386_GNU_VTINHERIT
:
1790 case elfcpp::R_386_GNU_VTENTRY
:
1793 case elfcpp::R_X86_64_64
:
1794 Relocate_functions
<64, false>::rela64(view
, object
, psymval
, addend
);
1797 case elfcpp::R_X86_64_PC64
:
1798 Relocate_functions
<64, false>::pcrela64(view
, object
, psymval
, addend
,
1802 case elfcpp::R_X86_64_32
:
1803 // FIXME: we need to verify that value + addend fits into 32 bits:
1804 // uint64_t x = value + addend;
1805 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
1806 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
1807 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1810 case elfcpp::R_X86_64_32S
:
1811 // FIXME: we need to verify that value + addend fits into 32 bits:
1812 // int64_t x = value + addend; // note this quantity is signed!
1813 // x == static_cast<int64_t>(static_cast<int32_t>(x))
1814 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1817 case elfcpp::R_X86_64_PC32
:
1818 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1822 case elfcpp::R_X86_64_16
:
1823 Relocate_functions
<64, false>::rela16(view
, object
, psymval
, addend
);
1826 case elfcpp::R_X86_64_PC16
:
1827 Relocate_functions
<64, false>::pcrela16(view
, object
, psymval
, addend
,
1831 case elfcpp::R_X86_64_8
:
1832 Relocate_functions
<64, false>::rela8(view
, object
, psymval
, addend
);
1835 case elfcpp::R_X86_64_PC8
:
1836 Relocate_functions
<64, false>::pcrela8(view
, object
, psymval
, addend
,
1840 case elfcpp::R_X86_64_PLT32
:
1841 gold_assert(gsym
== NULL
1842 || gsym
->has_plt_offset()
1843 || gsym
->final_value_is_known()
1844 || (gsym
->is_defined()
1845 && !gsym
->is_from_dynobj()
1846 && !gsym
->is_preemptible()));
1847 // Note: while this code looks the same as for R_X86_64_PC32, it
1848 // behaves differently because psymval was set to point to
1849 // the PLT entry, rather than the symbol, in Scan::global().
1850 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1854 case elfcpp::R_X86_64_PLTOFF64
:
1857 gold_assert(gsym
->has_plt_offset()
1858 || gsym
->final_value_is_known());
1859 elfcpp::Elf_types
<64>::Elf_Addr got_address
;
1860 got_address
= target
->got_section(NULL
, NULL
)->address();
1861 Relocate_functions
<64, false>::rela64(view
, object
, psymval
,
1862 addend
- got_address
);
1865 case elfcpp::R_X86_64_GOT32
:
1866 gold_assert(have_got_offset
);
1867 Relocate_functions
<64, false>::rela32(view
, got_offset
, addend
);
1870 case elfcpp::R_X86_64_GOTPC32
:
1873 elfcpp::Elf_types
<64>::Elf_Addr value
;
1874 value
= target
->got_plt_section()->address();
1875 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1879 case elfcpp::R_X86_64_GOT64
:
1880 // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
1881 // Since we always add a PLT entry, this is equivalent.
1882 case elfcpp::R_X86_64_GOTPLT64
:
1883 gold_assert(have_got_offset
);
1884 Relocate_functions
<64, false>::rela64(view
, got_offset
, addend
);
1887 case elfcpp::R_X86_64_GOTPC64
:
1890 elfcpp::Elf_types
<64>::Elf_Addr value
;
1891 value
= target
->got_plt_section()->address();
1892 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1896 case elfcpp::R_X86_64_GOTOFF64
:
1898 elfcpp::Elf_types
<64>::Elf_Addr value
;
1899 value
= (psymval
->value(object
, 0)
1900 - target
->got_plt_section()->address());
1901 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
1905 case elfcpp::R_X86_64_GOTPCREL
:
1907 gold_assert(have_got_offset
);
1908 elfcpp::Elf_types
<64>::Elf_Addr value
;
1909 value
= target
->got_plt_section()->address() + got_offset
;
1910 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1914 case elfcpp::R_X86_64_GOTPCREL64
:
1916 gold_assert(have_got_offset
);
1917 elfcpp::Elf_types
<64>::Elf_Addr value
;
1918 value
= target
->got_plt_section()->address() + got_offset
;
1919 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1923 case elfcpp::R_X86_64_COPY
:
1924 case elfcpp::R_X86_64_GLOB_DAT
:
1925 case elfcpp::R_X86_64_JUMP_SLOT
:
1926 case elfcpp::R_X86_64_RELATIVE
:
1927 // These are outstanding tls relocs, which are unexpected when linking
1928 case elfcpp::R_X86_64_TPOFF64
:
1929 case elfcpp::R_X86_64_DTPMOD64
:
1930 case elfcpp::R_X86_64_TLSDESC
:
1931 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1932 _("unexpected reloc %u in object file"),
1936 // These are initial tls relocs, which are expected when linking
1937 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1938 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1939 case elfcpp::R_X86_64_TLSDESC_CALL
:
1940 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1941 case elfcpp::R_X86_64_DTPOFF32
:
1942 case elfcpp::R_X86_64_DTPOFF64
:
1943 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1944 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1945 this->relocate_tls(relinfo
, target
, relnum
, rela
, r_type
, gsym
, psymval
,
1946 view
, address
, view_size
);
1949 case elfcpp::R_X86_64_SIZE32
:
1950 case elfcpp::R_X86_64_SIZE64
:
1952 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1953 _("unsupported reloc %u"),
1961 // Perform a TLS relocation.
1964 Target_x86_64::Relocate::relocate_tls(const Relocate_info
<64, false>* relinfo
,
1965 Target_x86_64
* target
,
1967 const elfcpp::Rela
<64, false>& rela
,
1968 unsigned int r_type
,
1969 const Sized_symbol
<64>* gsym
,
1970 const Symbol_value
<64>* psymval
,
1971 unsigned char* view
,
1972 elfcpp::Elf_types
<64>::Elf_Addr address
,
1973 section_size_type view_size
)
1975 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1977 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1978 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1980 elfcpp::Elf_types
<64>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
1982 const bool is_final
= (gsym
== NULL
1983 ? !parameters
->options().output_is_position_independent()
1984 : gsym
->final_value_is_known());
1985 const tls::Tls_optimization optimized_type
1986 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1989 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1990 this->saw_tls_block_reloc_
= true;
1991 if (optimized_type
== tls::TLSOPT_TO_LE
)
1993 gold_assert(tls_segment
!= NULL
);
1994 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1995 rela
, r_type
, value
, view
,
2001 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2002 ? GOT_TYPE_TLS_OFFSET
2003 : GOT_TYPE_TLS_PAIR
);
2004 unsigned int got_offset
;
2007 gold_assert(gsym
->has_got_offset(got_type
));
2008 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2012 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2013 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2014 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2015 - target
->got_size());
2017 if (optimized_type
== tls::TLSOPT_TO_IE
)
2019 gold_assert(tls_segment
!= NULL
);
2020 value
= target
->got_plt_section()->address() + got_offset
;
2021 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rela
, r_type
,
2022 value
, view
, address
, view_size
);
2025 else if (optimized_type
== tls::TLSOPT_NONE
)
2027 // Relocate the field with the offset of the pair of GOT
2029 value
= target
->got_plt_section()->address() + got_offset
;
2030 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2035 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2036 _("unsupported reloc %u"), r_type
);
2039 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2040 case elfcpp::R_X86_64_TLSDESC_CALL
:
2041 this->saw_tls_block_reloc_
= true;
2042 if (optimized_type
== tls::TLSOPT_TO_LE
)
2044 gold_assert(tls_segment
!= NULL
);
2045 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
2046 rela
, r_type
, value
, view
,
2052 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
2053 ? GOT_TYPE_TLS_OFFSET
2054 : GOT_TYPE_TLS_DESC
);
2055 unsigned int got_offset
;
2058 gold_assert(gsym
->has_got_offset(got_type
));
2059 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
2063 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2064 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
2065 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
2066 - target
->got_size());
2068 if (optimized_type
== tls::TLSOPT_TO_IE
)
2070 gold_assert(tls_segment
!= NULL
);
2071 value
= target
->got_plt_section()->address() + got_offset
;
2072 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
,
2073 rela
, r_type
, value
, view
, address
,
2077 else if (optimized_type
== tls::TLSOPT_NONE
)
2079 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2081 // Relocate the field with the offset of the pair of GOT
2083 value
= target
->got_plt_section()->address() + got_offset
;
2084 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2090 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2091 _("unsupported reloc %u"), r_type
);
2094 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2095 this->saw_tls_block_reloc_
= true;
2096 if (optimized_type
== tls::TLSOPT_TO_LE
)
2098 gold_assert(tls_segment
!= NULL
);
2099 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rela
, r_type
,
2100 value
, view
, view_size
);
2103 else if (optimized_type
== tls::TLSOPT_NONE
)
2105 // Relocate the field with the offset of the GOT entry for
2106 // the module index.
2107 unsigned int got_offset
;
2108 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
2109 - target
->got_size());
2110 value
= target
->got_plt_section()->address() + got_offset
;
2111 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
2115 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2116 _("unsupported reloc %u"), r_type
);
2119 case elfcpp::R_X86_64_DTPOFF32
:
2120 if (optimized_type
== tls::TLSOPT_TO_LE
)
2122 // This relocation type is used in debugging information.
2123 // In that case we need to not optimize the value. If we
2124 // haven't seen a TLSLD reloc, then we assume we should not
2125 // optimize this reloc.
2126 if (this->saw_tls_block_reloc_
)
2128 gold_assert(tls_segment
!= NULL
);
2129 value
-= tls_segment
->memsz();
2132 Relocate_functions
<64, false>::rela32(view
, value
, addend
);
2135 case elfcpp::R_X86_64_DTPOFF64
:
2136 if (optimized_type
== tls::TLSOPT_TO_LE
)
2138 // See R_X86_64_DTPOFF32, just above, for why we test this.
2139 if (this->saw_tls_block_reloc_
)
2141 gold_assert(tls_segment
!= NULL
);
2142 value
-= tls_segment
->memsz();
2145 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
2148 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2149 if (optimized_type
== tls::TLSOPT_TO_LE
)
2151 gold_assert(tls_segment
!= NULL
);
2152 Target_x86_64::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
2153 rela
, r_type
, value
, view
,
2157 else if (optimized_type
== tls::TLSOPT_NONE
)
2159 // Relocate the field with the offset of the GOT entry for
2160 // the tp-relative offset of the symbol.
2161 unsigned int got_offset
;
2164 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
));
2165 got_offset
= (gsym
->got_offset(GOT_TYPE_TLS_OFFSET
)
2166 - target
->got_size());
2170 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
2171 gold_assert(object
->local_has_got_offset(r_sym
,
2172 GOT_TYPE_TLS_OFFSET
));
2173 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
)
2174 - target
->got_size());
2176 value
= target
->got_plt_section()->address() + got_offset
;
2177 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
2180 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
2181 _("unsupported reloc type %u"),
2185 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2186 value
-= tls_segment
->memsz();
2187 Relocate_functions
<64, false>::rela32(view
, value
, addend
);
2192 // Do a relocation in which we convert a TLS General-Dynamic to an
2196 Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info
<64, false>* relinfo
,
2199 const elfcpp::Rela
<64, false>& rela
,
2201 elfcpp::Elf_types
<64>::Elf_Addr value
,
2202 unsigned char* view
,
2203 elfcpp::Elf_types
<64>::Elf_Addr address
,
2204 section_size_type view_size
)
2206 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2207 // .word 0x6666; rex64; call __tls_get_addr
2208 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
2210 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
2211 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
2213 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2214 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
2215 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2216 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
2218 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16);
2220 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
2221 Relocate_functions
<64, false>::pcrela32(view
+ 8, value
, addend
- 8, address
);
2223 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2225 this->skip_call_tls_get_addr_
= true;
2228 // Do a relocation in which we convert a TLS General-Dynamic to a
2232 Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info
<64, false>* relinfo
,
2234 Output_segment
* tls_segment
,
2235 const elfcpp::Rela
<64, false>& rela
,
2237 elfcpp::Elf_types
<64>::Elf_Addr value
,
2238 unsigned char* view
,
2239 section_size_type view_size
)
2241 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2242 // .word 0x6666; rex64; call __tls_get_addr
2243 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
2245 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
2246 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
2248 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2249 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
2250 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2251 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
2253 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
2255 value
-= tls_segment
->memsz();
2256 Relocate_functions
<64, false>::rela32(view
+ 8, value
, 0);
2258 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2260 this->skip_call_tls_get_addr_
= true;
2263 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
2266 Target_x86_64::Relocate::tls_desc_gd_to_ie(
2267 const Relocate_info
<64, false>* relinfo
,
2270 const elfcpp::Rela
<64, false>& rela
,
2271 unsigned int r_type
,
2272 elfcpp::Elf_types
<64>::Elf_Addr value
,
2273 unsigned char* view
,
2274 elfcpp::Elf_types
<64>::Elf_Addr address
,
2275 section_size_type view_size
)
2277 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2279 // leaq foo@tlsdesc(%rip), %rax
2280 // ==> movq foo@gottpoff(%rip), %rax
2281 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2282 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2283 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2284 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
2286 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
2287 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
2291 // call *foo@tlscall(%rax)
2293 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
2294 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
2295 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2296 view
[0] == 0xff && view
[1] == 0x10);
2302 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
2305 Target_x86_64::Relocate::tls_desc_gd_to_le(
2306 const Relocate_info
<64, false>* relinfo
,
2308 Output_segment
* tls_segment
,
2309 const elfcpp::Rela
<64, false>& rela
,
2310 unsigned int r_type
,
2311 elfcpp::Elf_types
<64>::Elf_Addr value
,
2312 unsigned char* view
,
2313 section_size_type view_size
)
2315 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
2317 // leaq foo@tlsdesc(%rip), %rax
2318 // ==> movq foo@tpoff, %rax
2319 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2320 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2321 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2322 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
2325 value
-= tls_segment
->memsz();
2326 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2330 // call *foo@tlscall(%rax)
2332 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
2333 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
2334 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2335 view
[0] == 0xff && view
[1] == 0x10);
2342 Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info
<64, false>* relinfo
,
2345 const elfcpp::Rela
<64, false>& rela
,
2347 elfcpp::Elf_types
<64>::Elf_Addr
,
2348 unsigned char* view
,
2349 section_size_type view_size
)
2351 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
2352 // ... leq foo@dtpoff(%rax),%reg
2353 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
2355 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2356 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 9);
2358 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
2359 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x3d);
2361 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(), view
[4] == 0xe8);
2363 memcpy(view
- 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
2365 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2367 this->skip_call_tls_get_addr_
= true;
2370 // Do a relocation in which we convert a TLS Initial-Exec to a
2374 Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info
<64, false>* relinfo
,
2376 Output_segment
* tls_segment
,
2377 const elfcpp::Rela
<64, false>& rela
,
2379 elfcpp::Elf_types
<64>::Elf_Addr value
,
2380 unsigned char* view
,
2381 section_size_type view_size
)
2383 // We need to examine the opcodes to figure out which instruction we
2386 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
2387 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
2389 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
2390 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2392 unsigned char op1
= view
[-3];
2393 unsigned char op2
= view
[-2];
2394 unsigned char op3
= view
[-1];
2395 unsigned char reg
= op3
>> 3;
2403 view
[-1] = 0xc0 | reg
;
2407 // Special handling for %rsp.
2411 view
[-1] = 0xc0 | reg
;
2419 view
[-1] = 0x80 | reg
| (reg
<< 3);
2422 value
-= tls_segment
->memsz();
2423 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2426 // Relocate section data.
2429 Target_x86_64::relocate_section(
2430 const Relocate_info
<64, false>* relinfo
,
2431 unsigned int sh_type
,
2432 const unsigned char* prelocs
,
2434 Output_section
* output_section
,
2435 bool needs_special_offset_handling
,
2436 unsigned char* view
,
2437 elfcpp::Elf_types
<64>::Elf_Addr address
,
2438 section_size_type view_size
,
2439 const Reloc_symbol_changes
* reloc_symbol_changes
)
2441 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2443 gold::relocate_section
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
2444 Target_x86_64::Relocate
>(
2450 needs_special_offset_handling
,
2454 reloc_symbol_changes
);
2457 // Return the size of a relocation while scanning during a relocatable
2461 Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc(
2462 unsigned int r_type
,
2467 case elfcpp::R_X86_64_NONE
:
2468 case elfcpp::R_386_GNU_VTINHERIT
:
2469 case elfcpp::R_386_GNU_VTENTRY
:
2470 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
2471 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2472 case elfcpp::R_X86_64_TLSDESC_CALL
:
2473 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2474 case elfcpp::R_X86_64_DTPOFF32
:
2475 case elfcpp::R_X86_64_DTPOFF64
:
2476 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2477 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2480 case elfcpp::R_X86_64_64
:
2481 case elfcpp::R_X86_64_PC64
:
2482 case elfcpp::R_X86_64_GOTOFF64
:
2483 case elfcpp::R_X86_64_GOTPC64
:
2484 case elfcpp::R_X86_64_PLTOFF64
:
2485 case elfcpp::R_X86_64_GOT64
:
2486 case elfcpp::R_X86_64_GOTPCREL64
:
2487 case elfcpp::R_X86_64_GOTPCREL
:
2488 case elfcpp::R_X86_64_GOTPLT64
:
2491 case elfcpp::R_X86_64_32
:
2492 case elfcpp::R_X86_64_32S
:
2493 case elfcpp::R_X86_64_PC32
:
2494 case elfcpp::R_X86_64_PLT32
:
2495 case elfcpp::R_X86_64_GOTPC32
:
2496 case elfcpp::R_X86_64_GOT32
:
2499 case elfcpp::R_X86_64_16
:
2500 case elfcpp::R_X86_64_PC16
:
2503 case elfcpp::R_X86_64_8
:
2504 case elfcpp::R_X86_64_PC8
:
2507 case elfcpp::R_X86_64_COPY
:
2508 case elfcpp::R_X86_64_GLOB_DAT
:
2509 case elfcpp::R_X86_64_JUMP_SLOT
:
2510 case elfcpp::R_X86_64_RELATIVE
:
2511 // These are outstanding tls relocs, which are unexpected when linking
2512 case elfcpp::R_X86_64_TPOFF64
:
2513 case elfcpp::R_X86_64_DTPMOD64
:
2514 case elfcpp::R_X86_64_TLSDESC
:
2515 object
->error(_("unexpected reloc %u in object file"), r_type
);
2518 case elfcpp::R_X86_64_SIZE32
:
2519 case elfcpp::R_X86_64_SIZE64
:
2521 object
->error(_("unsupported reloc %u against local symbol"), r_type
);
2526 // Scan the relocs during a relocatable link.
2529 Target_x86_64::scan_relocatable_relocs(Symbol_table
* symtab
,
2531 Sized_relobj
<64, false>* object
,
2532 unsigned int data_shndx
,
2533 unsigned int sh_type
,
2534 const unsigned char* prelocs
,
2536 Output_section
* output_section
,
2537 bool needs_special_offset_handling
,
2538 size_t local_symbol_count
,
2539 const unsigned char* plocal_symbols
,
2540 Relocatable_relocs
* rr
)
2542 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2544 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
2545 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2547 gold::scan_relocatable_relocs
<64, false, elfcpp::SHT_RELA
,
2548 Scan_relocatable_relocs
>(
2556 needs_special_offset_handling
,
2562 // Relocate a section during a relocatable link.
2565 Target_x86_64::relocate_for_relocatable(
2566 const Relocate_info
<64, false>* relinfo
,
2567 unsigned int sh_type
,
2568 const unsigned char* prelocs
,
2570 Output_section
* output_section
,
2571 off_t offset_in_output_section
,
2572 const Relocatable_relocs
* rr
,
2573 unsigned char* view
,
2574 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
2575 section_size_type view_size
,
2576 unsigned char* reloc_view
,
2577 section_size_type reloc_view_size
)
2579 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2581 gold::relocate_for_relocatable
<64, false, elfcpp::SHT_RELA
>(
2586 offset_in_output_section
,
2595 // Return the value to use for a dynamic which requires special
2596 // treatment. This is how we support equality comparisons of function
2597 // pointers across shared library boundaries, as described in the
2598 // processor specific ABI supplement.
2601 Target_x86_64::do_dynsym_value(const Symbol
* gsym
) const
2603 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2604 return this->plt_section()->address() + gsym
->plt_offset();
2607 // Return a string used to fill a code section with nops to take up
2608 // the specified length.
2611 Target_x86_64::do_code_fill(section_size_type length
) const
2615 // Build a jmpq instruction to skip over the bytes.
2616 unsigned char jmp
[5];
2618 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2619 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2620 + std::string(length
- 5, '\0'));
2623 // Nop sequences of various lengths.
2624 const char nop1
[1] = { 0x90 }; // nop
2625 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2626 const char nop3
[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax)
2627 const char nop4
[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax)
2628 const char nop5
[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1)
2630 const char nop6
[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1)
2632 const char nop7
[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax)
2634 const char nop8
[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1)
2635 0x00, 0x00, 0x00, 0x00 };
2636 const char nop9
[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1)
2637 0x00, 0x00, 0x00, 0x00,
2639 const char nop10
[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1)
2640 0x84, 0x00, 0x00, 0x00,
2642 const char nop11
[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16
2643 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2645 const char nop12
[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16
2646 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1)
2647 0x00, 0x00, 0x00, 0x00 };
2648 const char nop13
[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2649 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1)
2650 0x00, 0x00, 0x00, 0x00,
2652 const char nop14
[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2653 0x66, 0x2e, 0x0f, 0x1f, // data16
2654 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2656 const char nop15
[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2657 0x66, 0x66, 0x2e, 0x0f, // data16; data16
2658 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2661 const char* nops
[16] = {
2663 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2664 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2667 return std::string(nops
[length
], length
);
2670 // FNOFFSET in section SHNDX in OBJECT is the start of a function
2671 // compiled with -fstack-split. The function calls non-stack-split
2672 // code. We have to change the function so that it always ensures
2673 // that it has enough stack space to run some random function.
2676 Target_x86_64::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
2677 section_offset_type fnoffset
,
2678 section_size_type fnsize
,
2679 unsigned char* view
,
2680 section_size_type view_size
,
2682 std::string
* to
) const
2684 // The function starts with a comparison of the stack pointer and a
2685 // field in the TCB. This is followed by a jump.
2688 if (this->match_view(view
, view_size
, fnoffset
, "\x64\x48\x3b\x24\x25", 5)
2691 // We will call __morestack if the carry flag is set after this
2692 // comparison. We turn the comparison into an stc instruction
2694 view
[fnoffset
] = '\xf9';
2695 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, 8);
2697 // lea NN(%rsp),%r10
2698 // lea NN(%rsp),%r11
2699 else if ((this->match_view(view
, view_size
, fnoffset
,
2700 "\x4c\x8d\x94\x24", 4)
2701 || this->match_view(view
, view_size
, fnoffset
,
2702 "\x4c\x8d\x9c\x24", 4))
2705 // This is loading an offset from the stack pointer for a
2706 // comparison. The offset is negative, so we decrease the
2707 // offset by the amount of space we need for the stack. This
2708 // means we will avoid calling __morestack if there happens to
2709 // be plenty of space on the stack already.
2710 unsigned char* pval
= view
+ fnoffset
+ 4;
2711 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
2712 val
-= parameters
->options().split_stack_adjust_size();
2713 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
2717 if (!object
->has_no_split_stack())
2718 object
->error(_("failed to match split-stack sequence at "
2719 "section %u offset %0zx"),
2720 shndx
, static_cast<size_t>(fnoffset
));
2724 // We have to change the function so that it calls
2725 // __morestack_non_split instead of __morestack. The former will
2726 // allocate additional stack space.
2727 *from
= "__morestack";
2728 *to
= "__morestack_non_split";
2731 // The selector for x86_64 object files.
2733 class Target_selector_x86_64
: public Target_selector_freebsd
2736 Target_selector_x86_64()
2737 : Target_selector_freebsd(elfcpp::EM_X86_64
, 64, false, "elf64-x86-64",
2738 "elf64-x86-64-freebsd")
2742 do_instantiate_target()
2743 { return new Target_x86_64(); }
2747 Target_selector_x86_64 target_selector_x86_64
;
2749 } // End anonymous namespace.