1 // x86_64.cc -- x86_64 target support for gold.
3 // Copyright 2006, 2007, 2008 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"
36 #include "target-reloc.h"
37 #include "target-select.h"
45 class Output_data_plt_x86_64
;
47 // The x86_64 target class.
49 // http://www.x86-64.org/documentation/abi.pdf
50 // TLS info comes from
51 // http://people.redhat.com/drepper/tls.pdf
52 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
54 class Target_x86_64
: public Sized_target
<64, false>
57 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
58 // uses only Elf64_Rela relocation entries with explicit addends."
59 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false> Reloc_section
;
62 : Sized_target
<64, false>(&x86_64_info
),
63 got_(NULL
), plt_(NULL
), got_plt_(NULL
), rela_dyn_(NULL
),
64 copy_relocs_(NULL
), dynbss_(NULL
), got_mod_index_offset_(-1U)
67 // Scan the relocations to look for symbol adjustments.
69 scan_relocs(const General_options
& options
,
72 Sized_relobj
<64, false>* object
,
73 unsigned int data_shndx
,
75 const unsigned char* prelocs
,
77 Output_section
* output_section
,
78 bool needs_special_offset_handling
,
79 size_t local_symbol_count
,
80 const unsigned char* plocal_symbols
);
82 // Finalize the sections.
84 do_finalize_sections(Layout
*);
86 // Return the value to use for a dynamic which requires special
89 do_dynsym_value(const Symbol
*) const;
91 // Relocate a section.
93 relocate_section(const Relocate_info
<64, false>*,
95 const unsigned char* prelocs
,
97 Output_section
* output_section
,
98 bool needs_special_offset_handling
,
100 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
101 section_size_type view_size
);
103 // Scan the relocs during a relocatable link.
105 scan_relocatable_relocs(const General_options
& options
,
106 Symbol_table
* symtab
,
108 Sized_relobj
<64, false>* object
,
109 unsigned int data_shndx
,
110 unsigned int sh_type
,
111 const unsigned char* prelocs
,
113 Output_section
* output_section
,
114 bool needs_special_offset_handling
,
115 size_t local_symbol_count
,
116 const unsigned char* plocal_symbols
,
117 Relocatable_relocs
*);
119 // Relocate a section during a relocatable link.
121 relocate_for_relocatable(const Relocate_info
<64, false>*,
122 unsigned int sh_type
,
123 const unsigned char* prelocs
,
125 Output_section
* output_section
,
126 off_t offset_in_output_section
,
127 const Relocatable_relocs
*,
129 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
130 section_size_type view_size
,
131 unsigned char* reloc_view
,
132 section_size_type reloc_view_size
);
134 // Return a string used to fill a code section with nops.
136 do_code_fill(section_size_type length
) const;
138 // Return whether SYM is defined by the ABI.
140 do_is_defined_by_abi(Symbol
* sym
) const
141 { return strcmp(sym
->name(), "__tls_get_addr") == 0; }
143 // Return the size of the GOT section.
147 gold_assert(this->got_
!= NULL
);
148 return this->got_
->data_size();
152 // The class which scans relocations.
157 : issued_non_pic_error_(false)
161 local(const General_options
& options
, Symbol_table
* symtab
,
162 Layout
* layout
, Target_x86_64
* target
,
163 Sized_relobj
<64, false>* object
,
164 unsigned int data_shndx
,
165 Output_section
* output_section
,
166 const elfcpp::Rela
<64, false>& reloc
, unsigned int r_type
,
167 const elfcpp::Sym
<64, false>& lsym
);
170 global(const General_options
& options
, Symbol_table
* symtab
,
171 Layout
* layout
, Target_x86_64
* target
,
172 Sized_relobj
<64, false>* object
,
173 unsigned int data_shndx
,
174 Output_section
* output_section
,
175 const elfcpp::Rela
<64, false>& reloc
, unsigned int r_type
,
180 unsupported_reloc_local(Sized_relobj
<64, false>*, unsigned int r_type
);
183 unsupported_reloc_global(Sized_relobj
<64, false>*, unsigned int r_type
,
187 check_non_pic(Relobj
*, unsigned int r_type
);
189 // Whether we have issued an error about a non-PIC compilation.
190 bool issued_non_pic_error_
;
193 // The class which implements relocation.
198 : skip_call_tls_get_addr_(false)
203 if (this->skip_call_tls_get_addr_
)
205 // FIXME: This needs to specify the location somehow.
206 gold_error(_("missing expected TLS relocation"));
210 // Do a relocation. Return false if the caller should not issue
211 // any warnings about this relocation.
213 relocate(const Relocate_info
<64, false>*, Target_x86_64
*, size_t relnum
,
214 const elfcpp::Rela
<64, false>&,
215 unsigned int r_type
, const Sized_symbol
<64>*,
216 const Symbol_value
<64>*,
217 unsigned char*, elfcpp::Elf_types
<64>::Elf_Addr
,
221 // Do a TLS relocation.
223 relocate_tls(const Relocate_info
<64, false>*, Target_x86_64
*,
224 size_t relnum
, const elfcpp::Rela
<64, false>&,
225 unsigned int r_type
, const Sized_symbol
<64>*,
226 const Symbol_value
<64>*,
227 unsigned char*, elfcpp::Elf_types
<64>::Elf_Addr
,
230 // Do a TLS General-Dynamic to Local-Exec transition.
232 tls_gd_to_ie(const Relocate_info
<64, false>*, size_t relnum
,
233 Output_segment
* tls_segment
,
234 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
235 elfcpp::Elf_types
<64>::Elf_Addr value
,
237 section_size_type view_size
);
239 // Do a TLS General-Dynamic to Local-Exec transition.
241 tls_gd_to_le(const Relocate_info
<64, false>*, size_t relnum
,
242 Output_segment
* tls_segment
,
243 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
244 elfcpp::Elf_types
<64>::Elf_Addr value
,
246 section_size_type view_size
);
248 // Do a TLS Local-Dynamic to Local-Exec transition.
250 tls_ld_to_le(const Relocate_info
<64, false>*, size_t relnum
,
251 Output_segment
* tls_segment
,
252 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
253 elfcpp::Elf_types
<64>::Elf_Addr value
,
255 section_size_type view_size
);
257 // Do a TLS Initial-Exec to Local-Exec transition.
259 tls_ie_to_le(const Relocate_info
<64, false>*, size_t relnum
,
260 Output_segment
* tls_segment
,
261 const elfcpp::Rela
<64, false>&, unsigned int r_type
,
262 elfcpp::Elf_types
<64>::Elf_Addr value
,
264 section_size_type view_size
);
266 // This is set if we should skip the next reloc, which should be a
267 // PLT32 reloc against ___tls_get_addr.
268 bool skip_call_tls_get_addr_
;
271 // A class which returns the size required for a relocation type,
272 // used while scanning relocs during a relocatable link.
273 class Relocatable_size_for_reloc
277 get_size_for_reloc(unsigned int, Relobj
*);
280 // Adjust TLS relocation type based on the options and whether this
281 // is a local symbol.
282 static tls::Tls_optimization
283 optimize_tls_reloc(bool is_final
, int r_type
);
285 // Get the GOT section, creating it if necessary.
286 Output_data_got
<64, false>*
287 got_section(Symbol_table
*, Layout
*);
289 // Get the GOT PLT section.
291 got_plt_section() const
293 gold_assert(this->got_plt_
!= NULL
);
294 return this->got_plt_
;
297 // Create a PLT entry for a global symbol.
299 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
301 // Create a GOT entry for the TLS module index.
303 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
304 Sized_relobj
<64, false>* object
);
306 // Get the PLT section.
307 Output_data_plt_x86_64
*
310 gold_assert(this->plt_
!= NULL
);
314 // Get the dynamic reloc section, creating it if necessary.
316 rela_dyn_section(Layout
*);
318 // Return true if the symbol may need a COPY relocation.
319 // References from an executable object to non-function symbols
320 // defined in a dynamic object may need a COPY relocation.
322 may_need_copy_reloc(Symbol
* gsym
)
324 return (!parameters
->options().shared()
325 && gsym
->is_from_dynobj()
326 && gsym
->type() != elfcpp::STT_FUNC
);
329 // Copy a relocation against a global symbol.
331 copy_reloc(const General_options
*, Symbol_table
*, Layout
*,
332 Sized_relobj
<64, false>*, unsigned int,
333 Output_section
*, Symbol
*, const elfcpp::Rela
<64, false>&);
335 // Information about this specific target which we pass to the
336 // general Target structure.
337 static const Target::Target_info x86_64_info
;
341 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
342 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
343 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
344 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
348 Output_data_got
<64, false>* got_
;
350 Output_data_plt_x86_64
* plt_
;
351 // The GOT PLT section.
352 Output_data_space
* got_plt_
;
353 // The dynamic reloc section.
354 Reloc_section
* rela_dyn_
;
355 // Relocs saved to avoid a COPY reloc.
356 Copy_relocs
<64, false>* copy_relocs_
;
357 // Space for variables copied with a COPY reloc.
358 Output_data_space
* dynbss_
;
359 // Offset of the GOT entry for the TLS module index;
360 unsigned int got_mod_index_offset_
;
363 const Target::Target_info
Target_x86_64::x86_64_info
=
366 false, // is_big_endian
367 elfcpp::EM_X86_64
, // machine_code
368 false, // has_make_symbol
369 false, // has_resolve
370 true, // has_code_fill
371 true, // is_default_stack_executable
373 "/lib/ld64.so.1", // program interpreter
374 0x400000, // default_text_segment_address
375 0x1000, // abi_pagesize (overridable by -z max-page-size)
376 0x1000 // common_pagesize (overridable by -z common-page-size)
379 // Get the GOT section, creating it if necessary.
381 Output_data_got
<64, false>*
382 Target_x86_64::got_section(Symbol_table
* symtab
, Layout
* layout
)
384 if (this->got_
== NULL
)
386 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
388 this->got_
= new Output_data_got
<64, false>();
390 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
391 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
394 // The old GNU linker creates a .got.plt section. We just
395 // create another set of data in the .got section. Note that we
396 // always create a PLT if we create a GOT, although the PLT
398 this->got_plt_
= new Output_data_space(8);
399 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
400 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
403 // The first three entries are reserved.
404 this->got_plt_
->set_current_data_size(3 * 8);
406 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
407 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
409 0, 0, elfcpp::STT_OBJECT
,
411 elfcpp::STV_HIDDEN
, 0,
418 // Get the dynamic reloc section, creating it if necessary.
420 Target_x86_64::Reloc_section
*
421 Target_x86_64::rela_dyn_section(Layout
* layout
)
423 if (this->rela_dyn_
== NULL
)
425 gold_assert(layout
!= NULL
);
426 this->rela_dyn_
= new Reloc_section();
427 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
428 elfcpp::SHF_ALLOC
, this->rela_dyn_
);
430 return this->rela_dyn_
;
433 // A class to handle the PLT data.
435 class Output_data_plt_x86_64
: public Output_section_data
438 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, 64, false> Reloc_section
;
440 Output_data_plt_x86_64(Layout
*, Output_data_space
*);
442 // Add an entry to the PLT.
444 add_entry(Symbol
* gsym
);
446 // Return the .rel.plt section data.
449 { return this->rel_
; }
453 do_adjust_output_section(Output_section
* os
);
456 // The size of an entry in the PLT.
457 static const int plt_entry_size
= 16;
459 // The first entry in the PLT.
460 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
461 // procedure linkage table for both programs and shared objects."
462 static unsigned char first_plt_entry
[plt_entry_size
];
464 // Other entries in the PLT for an executable.
465 static unsigned char plt_entry
[plt_entry_size
];
467 // Set the final size.
469 set_final_data_size()
470 { this->set_data_size((this->count_
+ 1) * plt_entry_size
); }
472 // Write out the PLT data.
474 do_write(Output_file
*);
476 // The reloc section.
478 // The .got.plt section.
479 Output_data_space
* got_plt_
;
480 // The number of PLT entries.
484 // Create the PLT section. The ordinary .got section is an argument,
485 // since we need to refer to the start. We also create our own .got
486 // section just for PLT entries.
488 Output_data_plt_x86_64::Output_data_plt_x86_64(Layout
* layout
,
489 Output_data_space
* got_plt
)
490 : Output_section_data(8), got_plt_(got_plt
), count_(0)
492 this->rel_
= new Reloc_section();
493 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
494 elfcpp::SHF_ALLOC
, this->rel_
);
498 Output_data_plt_x86_64::do_adjust_output_section(Output_section
* os
)
500 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
501 // linker, and so do we.
505 // Add an entry to the PLT.
508 Output_data_plt_x86_64::add_entry(Symbol
* gsym
)
510 gold_assert(!gsym
->has_plt_offset());
512 // Note that when setting the PLT offset we skip the initial
513 // reserved PLT entry.
514 gsym
->set_plt_offset((this->count_
+ 1) * plt_entry_size
);
518 section_offset_type got_offset
= this->got_plt_
->current_data_size();
520 // Every PLT entry needs a GOT entry which points back to the PLT
521 // entry (this will be changed by the dynamic linker, normally
522 // lazily when the function is called).
523 this->got_plt_
->set_current_data_size(got_offset
+ 8);
525 // Every PLT entry needs a reloc.
526 gsym
->set_needs_dynsym_entry();
527 this->rel_
->add_global(gsym
, elfcpp::R_X86_64_JUMP_SLOT
, this->got_plt_
,
530 // Note that we don't need to save the symbol. The contents of the
531 // PLT are independent of which symbols are used. The symbols only
532 // appear in the relocations.
535 // The first entry in the PLT for an executable.
537 unsigned char Output_data_plt_x86_64::first_plt_entry
[plt_entry_size
] =
539 // From AMD64 ABI Draft 0.98, page 76
540 0xff, 0x35, // pushq contents of memory address
541 0, 0, 0, 0, // replaced with address of .got + 8
542 0xff, 0x25, // jmp indirect
543 0, 0, 0, 0, // replaced with address of .got + 16
544 0x90, 0x90, 0x90, 0x90 // noop (x4)
547 // Subsequent entries in the PLT for an executable.
549 unsigned char Output_data_plt_x86_64::plt_entry
[plt_entry_size
] =
551 // From AMD64 ABI Draft 0.98, page 76
552 0xff, 0x25, // jmpq indirect
553 0, 0, 0, 0, // replaced with address of symbol in .got
554 0x68, // pushq immediate
555 0, 0, 0, 0, // replaced with offset into relocation table
556 0xe9, // jmpq relative
557 0, 0, 0, 0 // replaced with offset to start of .plt
560 // Write out the PLT. This uses the hand-coded instructions above,
561 // and adjusts them as needed. This is specified by the AMD64 ABI.
564 Output_data_plt_x86_64::do_write(Output_file
* of
)
566 const off_t offset
= this->offset();
567 const section_size_type oview_size
=
568 convert_to_section_size_type(this->data_size());
569 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
571 const off_t got_file_offset
= this->got_plt_
->offset();
572 const section_size_type got_size
=
573 convert_to_section_size_type(this->got_plt_
->data_size());
574 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
577 unsigned char* pov
= oview
;
579 elfcpp::Elf_types
<32>::Elf_Addr plt_address
= this->address();
580 elfcpp::Elf_types
<32>::Elf_Addr got_address
= this->got_plt_
->address();
582 memcpy(pov
, first_plt_entry
, plt_entry_size
);
583 // We do a jmp relative to the PC at the end of this instruction.
584 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2, got_address
+ 8
585 - (plt_address
+ 6));
586 elfcpp::Swap
<32, false>::writeval(pov
+ 8, got_address
+ 16
587 - (plt_address
+ 12));
588 pov
+= plt_entry_size
;
590 unsigned char* got_pov
= got_view
;
592 memset(got_pov
, 0, 24);
595 unsigned int plt_offset
= plt_entry_size
;
596 unsigned int got_offset
= 24;
597 const unsigned int count
= this->count_
;
598 for (unsigned int plt_index
= 0;
601 pov
+= plt_entry_size
,
603 plt_offset
+= plt_entry_size
,
606 // Set and adjust the PLT entry itself.
607 memcpy(pov
, plt_entry
, plt_entry_size
);
608 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
609 (got_address
+ got_offset
610 - (plt_address
+ plt_offset
613 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_index
);
614 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
615 - (plt_offset
+ plt_entry_size
));
617 // Set the entry in the GOT.
618 elfcpp::Swap
<64, false>::writeval(got_pov
, plt_address
+ plt_offset
+ 6);
621 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
622 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
624 of
->write_output_view(offset
, oview_size
, oview
);
625 of
->write_output_view(got_file_offset
, got_size
, got_view
);
628 // Create a PLT entry for a global symbol.
631 Target_x86_64::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
634 if (gsym
->has_plt_offset())
637 if (this->plt_
== NULL
)
639 // Create the GOT sections first.
640 this->got_section(symtab
, layout
);
642 this->plt_
= new Output_data_plt_x86_64(layout
, this->got_plt_
);
643 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
645 | elfcpp::SHF_EXECINSTR
),
649 this->plt_
->add_entry(gsym
);
652 // Create a GOT entry for the TLS module index.
655 Target_x86_64::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
656 Sized_relobj
<64, false>* object
)
658 if (this->got_mod_index_offset_
== -1U)
660 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
661 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
662 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
663 unsigned int got_offset
= got
->add_constant(0);
664 rela_dyn
->add_local(object
, 0, elfcpp::R_X86_64_DTPMOD64
, got
,
666 got
->add_constant(0);
667 this->got_mod_index_offset_
= got_offset
;
669 return this->got_mod_index_offset_
;
672 // Handle a relocation against a non-function symbol defined in a
673 // dynamic object. The traditional way to handle this is to generate
674 // a COPY relocation to copy the variable at runtime from the shared
675 // object into the executable's data segment. However, this is
676 // undesirable in general, as if the size of the object changes in the
677 // dynamic object, the executable will no longer work correctly. If
678 // this relocation is in a writable section, then we can create a
679 // dynamic reloc and the dynamic linker will resolve it to the correct
680 // address at runtime. However, we do not want do that if the
681 // relocation is in a read-only section, as it would prevent the
682 // readonly segment from being shared. And if we have to eventually
683 // generate a COPY reloc, then any dynamic relocations will be
684 // useless. So this means that if this is a writable section, we need
685 // to save the relocation until we see whether we have to create a
686 // COPY relocation for this symbol for any other relocation.
689 Target_x86_64::copy_reloc(const General_options
* options
,
690 Symbol_table
* symtab
,
692 Sized_relobj
<64, false>* object
,
693 unsigned int data_shndx
,
694 Output_section
* output_section
,
696 const elfcpp::Rela
<64, false>& rela
)
698 Sized_symbol
<64>* ssym
= symtab
->get_sized_symbol
<64>(gsym
);
700 if (!Copy_relocs
<64, false>::need_copy_reloc(options
, object
,
703 // So far we do not need a COPY reloc. Save this relocation.
704 // If it turns out that we never need a COPY reloc for this
705 // symbol, then we will emit the relocation.
706 if (this->copy_relocs_
== NULL
)
707 this->copy_relocs_
= new Copy_relocs
<64, false>();
708 this->copy_relocs_
->save(ssym
, object
, data_shndx
, output_section
, rela
);
712 // Allocate space for this symbol in the .bss section.
714 elfcpp::Elf_types
<64>::Elf_WXword symsize
= ssym
->symsize();
716 // There is no defined way to determine the required alignment
717 // of the symbol. We pick the alignment based on the size. We
718 // set an arbitrary maximum of 256.
720 for (align
= 1; align
< 512; align
<<= 1)
721 if ((symsize
& align
) != 0)
724 if (this->dynbss_
== NULL
)
726 this->dynbss_
= new Output_data_space(align
);
727 layout
->add_output_section_data(".bss",
730 | elfcpp::SHF_WRITE
),
734 Output_data_space
* dynbss
= this->dynbss_
;
736 if (align
> dynbss
->addralign())
737 dynbss
->set_space_alignment(align
);
739 section_size_type dynbss_size
= dynbss
->current_data_size();
740 dynbss_size
= align_address(dynbss_size
, align
);
741 section_size_type offset
= dynbss_size
;
742 dynbss
->set_current_data_size(dynbss_size
+ symsize
);
744 symtab
->define_with_copy_reloc(ssym
, dynbss
, offset
);
746 // Add the COPY reloc.
747 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
748 rela_dyn
->add_global(ssym
, elfcpp::R_X86_64_COPY
, dynbss
, offset
, 0);
753 // Optimize the TLS relocation type based on what we know about the
754 // symbol. IS_FINAL is true if the final address of this symbol is
755 // known at link time.
757 tls::Tls_optimization
758 Target_x86_64::optimize_tls_reloc(bool is_final
, int r_type
)
760 // If we are generating a shared library, then we can't do anything
762 if (parameters
->options().shared())
763 return tls::TLSOPT_NONE
;
767 case elfcpp::R_X86_64_TLSGD
:
768 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
769 case elfcpp::R_X86_64_TLSDESC_CALL
:
770 // These are General-Dynamic which permits fully general TLS
771 // access. Since we know that we are generating an executable,
772 // we can convert this to Initial-Exec. If we also know that
773 // this is a local symbol, we can further switch to Local-Exec.
775 return tls::TLSOPT_TO_LE
;
776 return tls::TLSOPT_TO_IE
;
778 case elfcpp::R_X86_64_TLSLD
:
779 // This is Local-Dynamic, which refers to a local symbol in the
780 // dynamic TLS block. Since we know that we generating an
781 // executable, we can switch to Local-Exec.
782 return tls::TLSOPT_TO_LE
;
784 case elfcpp::R_X86_64_DTPOFF32
:
785 case elfcpp::R_X86_64_DTPOFF64
:
786 // Another Local-Dynamic reloc.
787 return tls::TLSOPT_TO_LE
;
789 case elfcpp::R_X86_64_GOTTPOFF
:
790 // These are Initial-Exec relocs which get the thread offset
791 // from the GOT. If we know that we are linking against the
792 // local symbol, we can switch to Local-Exec, which links the
793 // thread offset into the instruction.
795 return tls::TLSOPT_TO_LE
;
796 return tls::TLSOPT_NONE
;
798 case elfcpp::R_X86_64_TPOFF32
:
799 // When we already have Local-Exec, there is nothing further we
801 return tls::TLSOPT_NONE
;
808 // Report an unsupported relocation against a local symbol.
811 Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj
<64, false>* object
,
814 gold_error(_("%s: unsupported reloc %u against local symbol"),
815 object
->name().c_str(), r_type
);
818 // We are about to emit a dynamic relocation of type R_TYPE. If the
819 // dynamic linker does not support it, issue an error. The GNU linker
820 // only issues a non-PIC error for an allocated read-only section.
821 // Here we know the section is allocated, but we don't know that it is
822 // read-only. But we check for all the relocation types which the
823 // glibc dynamic linker supports, so it seems appropriate to issue an
824 // error even if the section is not read-only.
827 Target_x86_64::Scan::check_non_pic(Relobj
* object
, unsigned int r_type
)
831 // These are the relocation types supported by glibc for x86_64.
832 case elfcpp::R_X86_64_RELATIVE
:
833 case elfcpp::R_X86_64_GLOB_DAT
:
834 case elfcpp::R_X86_64_JUMP_SLOT
:
835 case elfcpp::R_X86_64_DTPMOD64
:
836 case elfcpp::R_X86_64_DTPOFF64
:
837 case elfcpp::R_X86_64_TPOFF64
:
838 case elfcpp::R_X86_64_64
:
839 case elfcpp::R_X86_64_32
:
840 case elfcpp::R_X86_64_PC32
:
841 case elfcpp::R_X86_64_COPY
:
845 // This prevents us from issuing more than one error per reloc
846 // section. But we can still wind up issuing more than one
847 // error per object file.
848 if (this->issued_non_pic_error_
)
850 object
->error(_("requires unsupported dynamic reloc; "
851 "recompile with -fPIC"));
852 this->issued_non_pic_error_
= true;
855 case elfcpp::R_X86_64_NONE
:
860 // Scan a relocation for a local symbol.
863 Target_x86_64::Scan::local(const General_options
&,
864 Symbol_table
* symtab
,
866 Target_x86_64
* target
,
867 Sized_relobj
<64, false>* object
,
868 unsigned int data_shndx
,
869 Output_section
* output_section
,
870 const elfcpp::Rela
<64, false>& reloc
,
872 const elfcpp::Sym
<64, false>& lsym
)
876 case elfcpp::R_X86_64_NONE
:
877 case elfcpp::R_386_GNU_VTINHERIT
:
878 case elfcpp::R_386_GNU_VTENTRY
:
881 case elfcpp::R_X86_64_64
:
882 // If building a shared library (or a position-independent
883 // executable), we need to create a dynamic relocation for this
884 // location. The relocation applied at link time will apply the
885 // link-time value, so we flag the location with an
886 // R_X86_64_RELATIVE relocation so the dynamic loader can
887 // relocate it easily.
888 if (parameters
->options().output_is_position_independent())
890 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
891 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
892 rela_dyn
->add_local_relative(object
, r_sym
,
893 elfcpp::R_X86_64_RELATIVE
,
894 output_section
, data_shndx
,
895 reloc
.get_r_offset(),
896 reloc
.get_r_addend());
900 case elfcpp::R_X86_64_32
:
901 case elfcpp::R_X86_64_32S
:
902 case elfcpp::R_X86_64_16
:
903 case elfcpp::R_X86_64_8
:
904 // If building a shared library (or a position-independent
905 // executable), we need to create a dynamic relocation for this
906 // location. We can't use an R_X86_64_RELATIVE relocation
907 // because that is always a 64-bit relocation.
908 if (parameters
->options().output_is_position_independent())
910 this->check_non_pic(object
, r_type
);
912 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
913 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
915 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
916 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
917 data_shndx
, reloc
.get_r_offset(),
918 reloc
.get_r_addend());
922 gold_assert(lsym
.get_st_value() == 0);
923 rela_dyn
->add_local_section(object
, lsym
.get_st_shndx(),
924 r_type
, output_section
,
925 data_shndx
, reloc
.get_r_offset(),
926 reloc
.get_r_addend());
931 case elfcpp::R_X86_64_PC64
:
932 case elfcpp::R_X86_64_PC32
:
933 case elfcpp::R_X86_64_PC16
:
934 case elfcpp::R_X86_64_PC8
:
937 case elfcpp::R_X86_64_PLT32
:
938 // Since we know this is a local symbol, we can handle this as a
942 case elfcpp::R_X86_64_GOTPC32
:
943 case elfcpp::R_X86_64_GOTOFF64
:
944 case elfcpp::R_X86_64_GOTPC64
:
945 case elfcpp::R_X86_64_PLTOFF64
:
946 // We need a GOT section.
947 target
->got_section(symtab
, layout
);
948 // For PLTOFF64, we'd normally want a PLT section, but since we
949 // know this is a local symbol, no PLT is needed.
952 case elfcpp::R_X86_64_GOT64
:
953 case elfcpp::R_X86_64_GOT32
:
954 case elfcpp::R_X86_64_GOTPCREL64
:
955 case elfcpp::R_X86_64_GOTPCREL
:
956 case elfcpp::R_X86_64_GOTPLT64
:
958 // The symbol requires a GOT entry.
959 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
960 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
961 if (got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
))
963 // If we are generating a shared object, we need to add a
964 // dynamic relocation for this symbol's GOT entry.
965 if (parameters
->options().output_is_position_independent())
967 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
968 // R_X86_64_RELATIVE assumes a 64-bit relocation.
969 if (r_type
!= elfcpp::R_X86_64_GOT32
)
970 rela_dyn
->add_local_relative(
971 object
, r_sym
, elfcpp::R_X86_64_RELATIVE
, got
,
972 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
975 this->check_non_pic(object
, r_type
);
977 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
979 object
, r_sym
, r_type
, got
,
980 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
984 // For GOTPLT64, we'd normally want a PLT section, but since
985 // we know this is a local symbol, no PLT is needed.
989 case elfcpp::R_X86_64_COPY
:
990 case elfcpp::R_X86_64_GLOB_DAT
:
991 case elfcpp::R_X86_64_JUMP_SLOT
:
992 case elfcpp::R_X86_64_RELATIVE
:
993 // These are outstanding tls relocs, which are unexpected when linking
994 case elfcpp::R_X86_64_TPOFF64
:
995 case elfcpp::R_X86_64_DTPMOD64
:
996 case elfcpp::R_X86_64_TLSDESC
:
997 gold_error(_("%s: unexpected reloc %u in object file"),
998 object
->name().c_str(), r_type
);
1001 // These are initial tls relocs, which are expected when linking
1002 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1003 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1004 case elfcpp::R_X86_64_TLSDESC_CALL
:
1005 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1006 case elfcpp::R_X86_64_DTPOFF32
:
1007 case elfcpp::R_X86_64_DTPOFF64
:
1008 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1009 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1011 bool output_is_shared
= parameters
->options().shared();
1012 const tls::Tls_optimization optimized_type
1013 = Target_x86_64::optimize_tls_reloc(!output_is_shared
, r_type
);
1016 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1017 if (optimized_type
== tls::TLSOPT_NONE
)
1019 // Create a pair of GOT entries for the module index and
1020 // dtv-relative offset.
1021 Output_data_got
<64, false>* got
1022 = target
->got_section(symtab
, layout
);
1023 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1024 got
->add_local_pair_with_rela(object
, r_sym
,
1025 lsym
.get_st_shndx(),
1027 target
->rela_dyn_section(layout
),
1028 elfcpp::R_X86_64_DTPMOD64
, 0);
1030 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1031 unsupported_reloc_local(object
, r_type
);
1034 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1035 case elfcpp::R_X86_64_TLSDESC_CALL
:
1036 // FIXME: If not relaxing to LE, we need to generate
1037 // a GOT entry with a R_x86_64_TLSDESC reloc.
1038 if (optimized_type
!= tls::TLSOPT_TO_LE
)
1039 unsupported_reloc_local(object
, r_type
);
1042 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1043 if (optimized_type
== tls::TLSOPT_NONE
)
1045 // Create a GOT entry for the module index.
1046 target
->got_mod_index_entry(symtab
, layout
, object
);
1048 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1049 unsupported_reloc_local(object
, r_type
);
1052 case elfcpp::R_X86_64_DTPOFF32
:
1053 case elfcpp::R_X86_64_DTPOFF64
:
1056 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1057 layout
->set_has_static_tls();
1058 if (optimized_type
== tls::TLSOPT_NONE
)
1060 // Create a GOT entry for the tp-relative offset.
1061 Output_data_got
<64, false>* got
1062 = target
->got_section(symtab
, layout
);
1063 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(reloc
.get_r_info());
1064 got
->add_local_with_rela(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
1065 target
->rela_dyn_section(layout
),
1066 elfcpp::R_X86_64_TPOFF64
);
1068 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1069 unsupported_reloc_local(object
, r_type
);
1072 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1073 layout
->set_has_static_tls();
1074 if (output_is_shared
)
1075 unsupported_reloc_local(object
, r_type
);
1084 case elfcpp::R_X86_64_SIZE32
:
1085 case elfcpp::R_X86_64_SIZE64
:
1087 gold_error(_("%s: unsupported reloc %u against local symbol"),
1088 object
->name().c_str(), r_type
);
1094 // Report an unsupported relocation against a global symbol.
1097 Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj
<64, false>* object
,
1098 unsigned int r_type
,
1101 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1102 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
1105 // Scan a relocation for a global symbol.
1108 Target_x86_64::Scan::global(const General_options
& options
,
1109 Symbol_table
* symtab
,
1111 Target_x86_64
* target
,
1112 Sized_relobj
<64, false>* object
,
1113 unsigned int data_shndx
,
1114 Output_section
* output_section
,
1115 const elfcpp::Rela
<64, false>& reloc
,
1116 unsigned int r_type
,
1121 case elfcpp::R_X86_64_NONE
:
1122 case elfcpp::R_386_GNU_VTINHERIT
:
1123 case elfcpp::R_386_GNU_VTENTRY
:
1126 case elfcpp::R_X86_64_64
:
1127 case elfcpp::R_X86_64_32
:
1128 case elfcpp::R_X86_64_32S
:
1129 case elfcpp::R_X86_64_16
:
1130 case elfcpp::R_X86_64_8
:
1132 // Make a PLT entry if necessary.
1133 if (gsym
->needs_plt_entry())
1135 target
->make_plt_entry(symtab
, layout
, gsym
);
1136 // Since this is not a PC-relative relocation, we may be
1137 // taking the address of a function. In that case we need to
1138 // set the entry in the dynamic symbol table to the address of
1140 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
1141 gsym
->set_needs_dynsym_value();
1143 // Make a dynamic relocation if necessary.
1144 if (gsym
->needs_dynamic_reloc(Symbol::ABSOLUTE_REF
))
1146 if (target
->may_need_copy_reloc(gsym
))
1148 target
->copy_reloc(&options
, symtab
, layout
, object
,
1149 data_shndx
, output_section
, gsym
, reloc
);
1151 else if (r_type
== elfcpp::R_X86_64_64
1152 && gsym
->can_use_relative_reloc(false))
1154 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1155 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_RELATIVE
,
1156 output_section
, object
,
1157 data_shndx
, reloc
.get_r_offset(),
1158 reloc
.get_r_addend());
1162 this->check_non_pic(object
, r_type
);
1163 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1164 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1165 data_shndx
, reloc
.get_r_offset(),
1166 reloc
.get_r_addend());
1172 case elfcpp::R_X86_64_PC64
:
1173 case elfcpp::R_X86_64_PC32
:
1174 case elfcpp::R_X86_64_PC16
:
1175 case elfcpp::R_X86_64_PC8
:
1177 // Make a PLT entry if necessary.
1178 if (gsym
->needs_plt_entry())
1179 target
->make_plt_entry(symtab
, layout
, gsym
);
1180 // Make a dynamic relocation if necessary.
1181 int flags
= Symbol::NON_PIC_REF
;
1182 if (gsym
->type() == elfcpp::STT_FUNC
)
1183 flags
|= Symbol::FUNCTION_CALL
;
1184 if (gsym
->needs_dynamic_reloc(flags
))
1186 if (target
->may_need_copy_reloc(gsym
))
1188 target
->copy_reloc(&options
, symtab
, layout
, object
,
1189 data_shndx
, output_section
, gsym
, reloc
);
1193 this->check_non_pic(object
, r_type
);
1194 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1195 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
1196 data_shndx
, reloc
.get_r_offset(),
1197 reloc
.get_r_addend());
1203 case elfcpp::R_X86_64_GOT64
:
1204 case elfcpp::R_X86_64_GOT32
:
1205 case elfcpp::R_X86_64_GOTPCREL64
:
1206 case elfcpp::R_X86_64_GOTPCREL
:
1207 case elfcpp::R_X86_64_GOTPLT64
:
1209 // The symbol requires a GOT entry.
1210 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
1211 if (gsym
->final_value_is_known())
1212 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
1215 // If this symbol is not fully resolved, we need to add a
1216 // dynamic relocation for it.
1217 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
1218 if (gsym
->is_from_dynobj()
1219 || gsym
->is_undefined()
1220 || gsym
->is_preemptible())
1221 got
->add_global_with_rela(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
1222 elfcpp::R_X86_64_GLOB_DAT
);
1225 if (got
->add_global(gsym
, GOT_TYPE_STANDARD
))
1226 rela_dyn
->add_global_relative(
1227 gsym
, elfcpp::R_X86_64_RELATIVE
, got
,
1228 gsym
->got_offset(GOT_TYPE_STANDARD
), 0);
1231 // For GOTPLT64, we also need a PLT entry (but only if the
1232 // symbol is not fully resolved).
1233 if (r_type
== elfcpp::R_X86_64_GOTPLT64
1234 && !gsym
->final_value_is_known())
1235 target
->make_plt_entry(symtab
, layout
, gsym
);
1239 case elfcpp::R_X86_64_PLT32
:
1240 // If the symbol is fully resolved, this is just a PC32 reloc.
1241 // Otherwise we need a PLT entry.
1242 if (gsym
->final_value_is_known())
1244 // If building a shared library, we can also skip the PLT entry
1245 // if the symbol is defined in the output file and is protected
1247 if (gsym
->is_defined()
1248 && !gsym
->is_from_dynobj()
1249 && !gsym
->is_preemptible())
1251 target
->make_plt_entry(symtab
, layout
, gsym
);
1254 case elfcpp::R_X86_64_GOTPC32
:
1255 case elfcpp::R_X86_64_GOTOFF64
:
1256 case elfcpp::R_X86_64_GOTPC64
:
1257 case elfcpp::R_X86_64_PLTOFF64
:
1258 // We need a GOT section.
1259 target
->got_section(symtab
, layout
);
1260 // For PLTOFF64, we also need a PLT entry (but only if the
1261 // symbol is not fully resolved).
1262 if (r_type
== elfcpp::R_X86_64_PLTOFF64
1263 && !gsym
->final_value_is_known())
1264 target
->make_plt_entry(symtab
, layout
, gsym
);
1267 case elfcpp::R_X86_64_COPY
:
1268 case elfcpp::R_X86_64_GLOB_DAT
:
1269 case elfcpp::R_X86_64_JUMP_SLOT
:
1270 case elfcpp::R_X86_64_RELATIVE
:
1271 // These are outstanding tls relocs, which are unexpected when linking
1272 case elfcpp::R_X86_64_TPOFF64
:
1273 case elfcpp::R_X86_64_DTPMOD64
:
1274 case elfcpp::R_X86_64_TLSDESC
:
1275 gold_error(_("%s: unexpected reloc %u in object file"),
1276 object
->name().c_str(), r_type
);
1279 // These are initial tls relocs, which are expected for global()
1280 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1281 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1282 case elfcpp::R_X86_64_TLSDESC_CALL
:
1283 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1284 case elfcpp::R_X86_64_DTPOFF32
:
1285 case elfcpp::R_X86_64_DTPOFF64
:
1286 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1287 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1289 const bool is_final
= gsym
->final_value_is_known();
1290 const tls::Tls_optimization optimized_type
1291 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1294 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
1295 if (optimized_type
== tls::TLSOPT_NONE
)
1297 // Create a pair of GOT entries for the module index and
1298 // dtv-relative offset.
1299 Output_data_got
<64, false>* got
1300 = target
->got_section(symtab
, layout
);
1301 got
->add_global_pair_with_rela(gsym
, GOT_TYPE_TLS_PAIR
,
1302 target
->rela_dyn_section(layout
),
1303 elfcpp::R_X86_64_DTPMOD64
,
1304 elfcpp::R_X86_64_DTPOFF64
);
1306 else if (optimized_type
== tls::TLSOPT_TO_IE
)
1308 // Create a GOT entry for the tp-relative offset.
1309 Output_data_got
<64, false>* got
1310 = target
->got_section(symtab
, layout
);
1311 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1312 target
->rela_dyn_section(layout
),
1313 elfcpp::R_X86_64_TPOFF64
);
1315 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1316 unsupported_reloc_global(object
, r_type
, gsym
);
1319 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
1320 case elfcpp::R_X86_64_TLSDESC_CALL
:
1321 // FIXME: If not relaxing to LE, we need to generate
1322 // DTPMOD64 and DTPOFF64, or TLSDESC, relocs.
1323 if (optimized_type
!= tls::TLSOPT_TO_LE
)
1324 unsupported_reloc_global(object
, r_type
, gsym
);
1327 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1328 if (optimized_type
== tls::TLSOPT_NONE
)
1330 // Create a GOT entry for the module index.
1331 target
->got_mod_index_entry(symtab
, layout
, object
);
1333 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1334 unsupported_reloc_global(object
, r_type
, gsym
);
1337 case elfcpp::R_X86_64_DTPOFF32
:
1338 case elfcpp::R_X86_64_DTPOFF64
:
1341 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1342 layout
->set_has_static_tls();
1343 if (optimized_type
== tls::TLSOPT_NONE
)
1345 // Create a GOT entry for the tp-relative offset.
1346 Output_data_got
<64, false>* got
1347 = target
->got_section(symtab
, layout
);
1348 got
->add_global_with_rela(gsym
, GOT_TYPE_TLS_OFFSET
,
1349 target
->rela_dyn_section(layout
),
1350 elfcpp::R_X86_64_TPOFF64
);
1352 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
1353 unsupported_reloc_global(object
, r_type
, gsym
);
1356 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1357 layout
->set_has_static_tls();
1358 if (parameters
->options().shared())
1359 unsupported_reloc_local(object
, r_type
);
1368 case elfcpp::R_X86_64_SIZE32
:
1369 case elfcpp::R_X86_64_SIZE64
:
1371 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
1372 object
->name().c_str(), r_type
,
1373 gsym
->demangled_name().c_str());
1378 // Scan relocations for a section.
1381 Target_x86_64::scan_relocs(const General_options
& options
,
1382 Symbol_table
* symtab
,
1384 Sized_relobj
<64, false>* object
,
1385 unsigned int data_shndx
,
1386 unsigned int sh_type
,
1387 const unsigned char* prelocs
,
1389 Output_section
* output_section
,
1390 bool needs_special_offset_handling
,
1391 size_t local_symbol_count
,
1392 const unsigned char* plocal_symbols
)
1394 if (sh_type
== elfcpp::SHT_REL
)
1396 gold_error(_("%s: unsupported REL reloc section"),
1397 object
->name().c_str());
1401 gold::scan_relocs
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
1402 Target_x86_64::Scan
>(
1412 needs_special_offset_handling
,
1417 // Finalize the sections.
1420 Target_x86_64::do_finalize_sections(Layout
* layout
)
1422 // Fill in some more dynamic tags.
1423 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
1426 if (this->got_plt_
!= NULL
)
1427 odyn
->add_section_address(elfcpp::DT_PLTGOT
, this->got_plt_
);
1429 if (this->plt_
!= NULL
)
1431 const Output_data
* od
= this->plt_
->rel_plt();
1432 odyn
->add_section_size(elfcpp::DT_PLTRELSZ
, od
);
1433 odyn
->add_section_address(elfcpp::DT_JMPREL
, od
);
1434 odyn
->add_constant(elfcpp::DT_PLTREL
, elfcpp::DT_RELA
);
1437 if (this->rela_dyn_
!= NULL
)
1439 const Output_data
* od
= this->rela_dyn_
;
1440 odyn
->add_section_address(elfcpp::DT_RELA
, od
);
1441 odyn
->add_section_size(elfcpp::DT_RELASZ
, od
);
1442 odyn
->add_constant(elfcpp::DT_RELAENT
,
1443 elfcpp::Elf_sizes
<64>::rela_size
);
1446 if (!parameters
->options().shared())
1448 // The value of the DT_DEBUG tag is filled in by the dynamic
1449 // linker at run time, and used by the debugger.
1450 odyn
->add_constant(elfcpp::DT_DEBUG
, 0);
1454 // Emit any relocs we saved in an attempt to avoid generating COPY
1456 if (this->copy_relocs_
== NULL
)
1458 if (this->copy_relocs_
->any_to_emit())
1460 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
1461 this->copy_relocs_
->emit(rela_dyn
);
1463 delete this->copy_relocs_
;
1464 this->copy_relocs_
= NULL
;
1467 // Perform a relocation.
1470 Target_x86_64::Relocate::relocate(const Relocate_info
<64, false>* relinfo
,
1471 Target_x86_64
* target
,
1473 const elfcpp::Rela
<64, false>& rela
,
1474 unsigned int r_type
,
1475 const Sized_symbol
<64>* gsym
,
1476 const Symbol_value
<64>* psymval
,
1477 unsigned char* view
,
1478 elfcpp::Elf_types
<64>::Elf_Addr address
,
1479 section_size_type view_size
)
1481 if (this->skip_call_tls_get_addr_
)
1483 if (r_type
!= elfcpp::R_X86_64_PLT32
1485 || strcmp(gsym
->name(), "__tls_get_addr") != 0)
1487 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1488 _("missing expected TLS relocation"));
1492 this->skip_call_tls_get_addr_
= false;
1497 // Pick the value to use for symbols defined in shared objects.
1498 Symbol_value
<64> symval
;
1500 && (gsym
->is_from_dynobj()
1501 || (parameters
->options().shared()
1502 && (gsym
->is_undefined() || gsym
->is_preemptible())))
1503 && gsym
->has_plt_offset())
1505 symval
.set_output_value(target
->plt_section()->address()
1506 + gsym
->plt_offset());
1510 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1511 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1513 // Get the GOT offset if needed.
1514 // The GOT pointer points to the end of the GOT section.
1515 // We need to subtract the size of the GOT section to get
1516 // the actual offset to use in the relocation.
1517 bool have_got_offset
= false;
1518 unsigned int got_offset
= 0;
1521 case elfcpp::R_X86_64_GOT32
:
1522 case elfcpp::R_X86_64_GOT64
:
1523 case elfcpp::R_X86_64_GOTPLT64
:
1524 case elfcpp::R_X86_64_GOTPCREL
:
1525 case elfcpp::R_X86_64_GOTPCREL64
:
1528 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
1529 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - target
->got_size();
1533 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
1534 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
1535 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
1536 - target
->got_size());
1538 have_got_offset
= true;
1547 case elfcpp::R_X86_64_NONE
:
1548 case elfcpp::R_386_GNU_VTINHERIT
:
1549 case elfcpp::R_386_GNU_VTENTRY
:
1552 case elfcpp::R_X86_64_64
:
1553 Relocate_functions
<64, false>::rela64(view
, object
, psymval
, addend
);
1556 case elfcpp::R_X86_64_PC64
:
1557 Relocate_functions
<64, false>::pcrela64(view
, object
, psymval
, addend
,
1561 case elfcpp::R_X86_64_32
:
1562 // FIXME: we need to verify that value + addend fits into 32 bits:
1563 // uint64_t x = value + addend;
1564 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
1565 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
1566 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1569 case elfcpp::R_X86_64_32S
:
1570 // FIXME: we need to verify that value + addend fits into 32 bits:
1571 // int64_t x = value + addend; // note this quantity is signed!
1572 // x == static_cast<int64_t>(static_cast<int32_t>(x))
1573 Relocate_functions
<64, false>::rela32(view
, object
, psymval
, addend
);
1576 case elfcpp::R_X86_64_PC32
:
1577 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1581 case elfcpp::R_X86_64_16
:
1582 Relocate_functions
<64, false>::rela16(view
, object
, psymval
, addend
);
1585 case elfcpp::R_X86_64_PC16
:
1586 Relocate_functions
<64, false>::pcrela16(view
, object
, psymval
, addend
,
1590 case elfcpp::R_X86_64_8
:
1591 Relocate_functions
<64, false>::rela8(view
, object
, psymval
, addend
);
1594 case elfcpp::R_X86_64_PC8
:
1595 Relocate_functions
<64, false>::pcrela8(view
, object
, psymval
, addend
,
1599 case elfcpp::R_X86_64_PLT32
:
1600 gold_assert(gsym
== NULL
1601 || gsym
->has_plt_offset()
1602 || gsym
->final_value_is_known()
1603 || (gsym
->is_defined()
1604 && !gsym
->is_from_dynobj()
1605 && !gsym
->is_preemptible()));
1606 // Note: while this code looks the same as for R_X86_64_PC32, it
1607 // behaves differently because psymval was set to point to
1608 // the PLT entry, rather than the symbol, in Scan::global().
1609 Relocate_functions
<64, false>::pcrela32(view
, object
, psymval
, addend
,
1613 case elfcpp::R_X86_64_PLTOFF64
:
1616 gold_assert(gsym
->has_plt_offset()
1617 || gsym
->final_value_is_known());
1618 elfcpp::Elf_types
<64>::Elf_Addr got_address
;
1619 got_address
= target
->got_section(NULL
, NULL
)->address();
1620 Relocate_functions
<64, false>::rela64(view
, object
, psymval
,
1621 addend
- got_address
);
1624 case elfcpp::R_X86_64_GOT32
:
1625 gold_assert(have_got_offset
);
1626 Relocate_functions
<64, false>::rela32(view
, got_offset
, addend
);
1629 case elfcpp::R_X86_64_GOTPC32
:
1632 elfcpp::Elf_types
<64>::Elf_Addr value
;
1633 value
= target
->got_plt_section()->address();
1634 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1638 case elfcpp::R_X86_64_GOT64
:
1639 // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
1640 // Since we always add a PLT entry, this is equivalent.
1641 case elfcpp::R_X86_64_GOTPLT64
:
1642 gold_assert(have_got_offset
);
1643 Relocate_functions
<64, false>::rela64(view
, got_offset
, addend
);
1646 case elfcpp::R_X86_64_GOTPC64
:
1649 elfcpp::Elf_types
<64>::Elf_Addr value
;
1650 value
= target
->got_plt_section()->address();
1651 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1655 case elfcpp::R_X86_64_GOTOFF64
:
1657 elfcpp::Elf_types
<64>::Elf_Addr value
;
1658 value
= (psymval
->value(object
, 0)
1659 - target
->got_plt_section()->address());
1660 Relocate_functions
<64, false>::rela64(view
, value
, addend
);
1664 case elfcpp::R_X86_64_GOTPCREL
:
1666 gold_assert(have_got_offset
);
1667 elfcpp::Elf_types
<64>::Elf_Addr value
;
1668 value
= target
->got_plt_section()->address() + got_offset
;
1669 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1673 case elfcpp::R_X86_64_GOTPCREL64
:
1675 gold_assert(have_got_offset
);
1676 elfcpp::Elf_types
<64>::Elf_Addr value
;
1677 value
= target
->got_plt_section()->address() + got_offset
;
1678 Relocate_functions
<64, false>::pcrela64(view
, value
, addend
, address
);
1682 case elfcpp::R_X86_64_COPY
:
1683 case elfcpp::R_X86_64_GLOB_DAT
:
1684 case elfcpp::R_X86_64_JUMP_SLOT
:
1685 case elfcpp::R_X86_64_RELATIVE
:
1686 // These are outstanding tls relocs, which are unexpected when linking
1687 case elfcpp::R_X86_64_TPOFF64
:
1688 case elfcpp::R_X86_64_DTPMOD64
:
1689 case elfcpp::R_X86_64_TLSDESC
:
1690 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1691 _("unexpected reloc %u in object file"),
1695 // These are initial tls relocs, which are expected when linking
1696 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1697 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1698 case elfcpp::R_X86_64_TLSDESC_CALL
:
1699 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1700 case elfcpp::R_X86_64_DTPOFF32
:
1701 case elfcpp::R_X86_64_DTPOFF64
:
1702 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1703 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1704 this->relocate_tls(relinfo
, target
, relnum
, rela
, r_type
, gsym
, psymval
,
1705 view
, address
, view_size
);
1708 case elfcpp::R_X86_64_SIZE32
:
1709 case elfcpp::R_X86_64_SIZE64
:
1711 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1712 _("unsupported reloc %u"),
1720 // Perform a TLS relocation.
1723 Target_x86_64::Relocate::relocate_tls(const Relocate_info
<64, false>* relinfo
,
1724 Target_x86_64
* target
,
1726 const elfcpp::Rela
<64, false>& rela
,
1727 unsigned int r_type
,
1728 const Sized_symbol
<64>* gsym
,
1729 const Symbol_value
<64>* psymval
,
1730 unsigned char* view
,
1731 elfcpp::Elf_types
<64>::Elf_Addr address
,
1732 section_size_type view_size
)
1734 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
1736 const Sized_relobj
<64, false>* object
= relinfo
->object
;
1737 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
1739 elfcpp::Elf_types
<64>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
1741 const bool is_final
= (gsym
== NULL
1742 ? !parameters
->options().output_is_position_independent()
1743 : gsym
->final_value_is_known());
1744 const tls::Tls_optimization optimized_type
1745 = Target_x86_64::optimize_tls_reloc(is_final
, r_type
);
1748 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
1749 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
1750 case elfcpp::R_X86_64_TLSDESC_CALL
:
1751 if (optimized_type
== tls::TLSOPT_TO_LE
)
1753 gold_assert(tls_segment
!= NULL
);
1754 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
1755 rela
, r_type
, value
, view
,
1761 unsigned int got_offset
;
1764 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_PAIR
));
1765 got_offset
= (gsym
->got_offset(GOT_TYPE_TLS_PAIR
)
1766 - target
->got_size());
1770 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
1771 gold_assert(object
->local_has_got_offset(r_sym
,
1772 GOT_TYPE_TLS_PAIR
));
1773 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_TLS_PAIR
)
1774 - target
->got_size());
1776 if (optimized_type
== tls::TLSOPT_TO_IE
)
1778 gold_assert(tls_segment
!= NULL
);
1779 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rela
, r_type
,
1780 got_offset
, view
, view_size
);
1783 else if (optimized_type
== tls::TLSOPT_NONE
)
1785 // Relocate the field with the offset of the pair of GOT
1787 value
= target
->got_plt_section()->address() + got_offset
;
1788 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
1793 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1794 _("unsupported reloc %u"), r_type
);
1797 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
1798 if (optimized_type
== tls::TLSOPT_TO_LE
)
1800 gold_assert(tls_segment
!= NULL
);
1801 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rela
, r_type
,
1802 value
, view
, view_size
);
1805 else if (optimized_type
== tls::TLSOPT_NONE
)
1807 // Relocate the field with the offset of the GOT entry for
1808 // the module index.
1809 unsigned int got_offset
;
1810 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
1811 - target
->got_size());
1812 value
= target
->got_plt_section()->address() + got_offset
;
1813 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
,
1817 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1818 _("unsupported reloc %u"), r_type
);
1821 case elfcpp::R_X86_64_DTPOFF32
:
1822 gold_assert(tls_segment
!= NULL
);
1823 if (optimized_type
== tls::TLSOPT_TO_LE
)
1824 value
-= tls_segment
->memsz();
1825 Relocate_functions
<64, false>::rela32(view
, value
, 0);
1828 case elfcpp::R_X86_64_DTPOFF64
:
1829 gold_assert(tls_segment
!= NULL
);
1830 if (optimized_type
== tls::TLSOPT_TO_LE
)
1831 value
-= tls_segment
->memsz();
1832 Relocate_functions
<64, false>::rela64(view
, value
, 0);
1835 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
1836 if (optimized_type
== tls::TLSOPT_TO_LE
)
1838 gold_assert(tls_segment
!= NULL
);
1839 Target_x86_64::Relocate::tls_ie_to_le(relinfo
, relnum
, tls_segment
,
1840 rela
, r_type
, value
, view
,
1844 else if (optimized_type
== tls::TLSOPT_NONE
)
1846 // Relocate the field with the offset of the GOT entry for
1847 // the tp-relative offset of the symbol.
1848 unsigned int got_offset
;
1851 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
));
1852 got_offset
= (gsym
->got_offset(GOT_TYPE_TLS_OFFSET
)
1853 - target
->got_size());
1857 unsigned int r_sym
= elfcpp::elf_r_sym
<64>(rela
.get_r_info());
1858 gold_assert(object
->local_has_got_offset(r_sym
,
1859 GOT_TYPE_TLS_OFFSET
));
1860 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
)
1861 - target
->got_size());
1863 value
= target
->got_plt_section()->address() + got_offset
;
1864 Relocate_functions
<64, false>::pcrela32(view
, value
, addend
, address
);
1867 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
1868 _("unsupported reloc type %u"),
1872 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
1873 value
-= tls_segment
->memsz();
1874 Relocate_functions
<64, false>::rela32(view
, value
, 0);
1879 // Do a relocation in which we convert a TLS General-Dynamic to an
1883 Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info
<64, false>* relinfo
,
1885 Output_segment
* tls_segment
,
1886 const elfcpp::Rela
<64, false>& rela
,
1888 elfcpp::Elf_types
<64>::Elf_Addr value
,
1889 unsigned char* view
,
1890 section_size_type view_size
)
1892 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
1893 // .word 0x6666; rex64; call __tls_get_addr
1894 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
1896 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
1897 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
1899 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
1900 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
1901 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
1902 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
1904 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16);
1906 value
-= tls_segment
->memsz();
1907 Relocate_functions
<64, false>::rela32(view
+ 8, value
, 0);
1909 // The next reloc should be a PLT32 reloc against __tls_get_addr.
1911 this->skip_call_tls_get_addr_
= true;
1914 // Do a relocation in which we convert a TLS General-Dynamic to a
1918 Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info
<64, false>* relinfo
,
1920 Output_segment
* tls_segment
,
1921 const elfcpp::Rela
<64, false>& rela
,
1923 elfcpp::Elf_types
<64>::Elf_Addr value
,
1924 unsigned char* view
,
1925 section_size_type view_size
)
1927 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
1928 // .word 0x6666; rex64; call __tls_get_addr
1929 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
1931 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -4);
1932 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
1934 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
1935 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
1936 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
1937 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
1939 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
1941 value
-= tls_segment
->memsz();
1942 Relocate_functions
<64, false>::rela32(view
+ 8, value
, 0);
1944 // The next reloc should be a PLT32 reloc against __tls_get_addr.
1946 this->skip_call_tls_get_addr_
= true;
1950 Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info
<64, false>* relinfo
,
1953 const elfcpp::Rela
<64, false>& rela
,
1955 elfcpp::Elf_types
<64>::Elf_Addr
,
1956 unsigned char* view
,
1957 section_size_type view_size
)
1959 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
1960 // ... leq foo@dtpoff(%rax),%reg
1961 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
1963 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
1964 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 9);
1966 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
1967 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x3d);
1969 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(), view
[4] == 0xe8);
1971 memcpy(view
- 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
1973 // The next reloc should be a PLT32 reloc against __tls_get_addr.
1975 this->skip_call_tls_get_addr_
= true;
1978 // Do a relocation in which we convert a TLS Initial-Exec to a
1982 Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info
<64, false>* relinfo
,
1984 Output_segment
* tls_segment
,
1985 const elfcpp::Rela
<64, false>& rela
,
1987 elfcpp::Elf_types
<64>::Elf_Addr value
,
1988 unsigned char* view
,
1989 section_size_type view_size
)
1991 // We need to examine the opcodes to figure out which instruction we
1994 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
1995 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
1997 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
1998 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
2000 unsigned char op1
= view
[-3];
2001 unsigned char op2
= view
[-2];
2002 unsigned char op3
= view
[-1];
2003 unsigned char reg
= op3
>> 3;
2011 view
[-1] = 0xc0 | reg
;
2015 // Special handling for %rsp.
2019 view
[-1] = 0xc0 | reg
;
2027 view
[-1] = 0x80 | reg
| (reg
<< 3);
2030 value
-= tls_segment
->memsz();
2031 Relocate_functions
<64, false>::rela32(view
, value
, 0);
2034 // Relocate section data.
2037 Target_x86_64::relocate_section(const Relocate_info
<64, false>* relinfo
,
2038 unsigned int sh_type
,
2039 const unsigned char* prelocs
,
2041 Output_section
* output_section
,
2042 bool needs_special_offset_handling
,
2043 unsigned char* view
,
2044 elfcpp::Elf_types
<64>::Elf_Addr address
,
2045 section_size_type view_size
)
2047 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2049 gold::relocate_section
<64, false, Target_x86_64
, elfcpp::SHT_RELA
,
2050 Target_x86_64::Relocate
>(
2056 needs_special_offset_handling
,
2062 // Return the size of a relocation while scanning during a relocatable
2066 Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc(
2067 unsigned int r_type
,
2072 case elfcpp::R_X86_64_NONE
:
2073 case elfcpp::R_386_GNU_VTINHERIT
:
2074 case elfcpp::R_386_GNU_VTENTRY
:
2075 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
2076 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2077 case elfcpp::R_X86_64_TLSDESC_CALL
:
2078 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2079 case elfcpp::R_X86_64_DTPOFF32
:
2080 case elfcpp::R_X86_64_DTPOFF64
:
2081 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2082 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2085 case elfcpp::R_X86_64_64
:
2086 case elfcpp::R_X86_64_PC64
:
2087 case elfcpp::R_X86_64_GOTOFF64
:
2088 case elfcpp::R_X86_64_GOTPC64
:
2089 case elfcpp::R_X86_64_PLTOFF64
:
2090 case elfcpp::R_X86_64_GOT64
:
2091 case elfcpp::R_X86_64_GOTPCREL64
:
2092 case elfcpp::R_X86_64_GOTPCREL
:
2093 case elfcpp::R_X86_64_GOTPLT64
:
2096 case elfcpp::R_X86_64_32
:
2097 case elfcpp::R_X86_64_32S
:
2098 case elfcpp::R_X86_64_PC32
:
2099 case elfcpp::R_X86_64_PLT32
:
2100 case elfcpp::R_X86_64_GOTPC32
:
2101 case elfcpp::R_X86_64_GOT32
:
2104 case elfcpp::R_X86_64_16
:
2105 case elfcpp::R_X86_64_PC16
:
2108 case elfcpp::R_X86_64_8
:
2109 case elfcpp::R_X86_64_PC8
:
2112 case elfcpp::R_X86_64_COPY
:
2113 case elfcpp::R_X86_64_GLOB_DAT
:
2114 case elfcpp::R_X86_64_JUMP_SLOT
:
2115 case elfcpp::R_X86_64_RELATIVE
:
2116 // These are outstanding tls relocs, which are unexpected when linking
2117 case elfcpp::R_X86_64_TPOFF64
:
2118 case elfcpp::R_X86_64_DTPMOD64
:
2119 case elfcpp::R_X86_64_TLSDESC
:
2120 object
->error(_("unexpected reloc %u in object file"), r_type
);
2123 case elfcpp::R_X86_64_SIZE32
:
2124 case elfcpp::R_X86_64_SIZE64
:
2126 object
->error(_("unsupported reloc %u against local symbol"), r_type
);
2131 // Scan the relocs during a relocatable link.
2134 Target_x86_64::scan_relocatable_relocs(const General_options
& options
,
2135 Symbol_table
* symtab
,
2137 Sized_relobj
<64, false>* object
,
2138 unsigned int data_shndx
,
2139 unsigned int sh_type
,
2140 const unsigned char* prelocs
,
2142 Output_section
* output_section
,
2143 bool needs_special_offset_handling
,
2144 size_t local_symbol_count
,
2145 const unsigned char* plocal_symbols
,
2146 Relocatable_relocs
* rr
)
2148 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2150 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
2151 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
2153 gold::scan_relocatable_relocs
<64, false, elfcpp::SHT_RELA
,
2154 Scan_relocatable_relocs
>(
2163 needs_special_offset_handling
,
2169 // Relocate a section during a relocatable link.
2172 Target_x86_64::relocate_for_relocatable(
2173 const Relocate_info
<64, false>* relinfo
,
2174 unsigned int sh_type
,
2175 const unsigned char* prelocs
,
2177 Output_section
* output_section
,
2178 off_t offset_in_output_section
,
2179 const Relocatable_relocs
* rr
,
2180 unsigned char* view
,
2181 elfcpp::Elf_types
<64>::Elf_Addr view_address
,
2182 section_size_type view_size
,
2183 unsigned char* reloc_view
,
2184 section_size_type reloc_view_size
)
2186 gold_assert(sh_type
== elfcpp::SHT_RELA
);
2188 gold::relocate_for_relocatable
<64, false, elfcpp::SHT_RELA
>(
2193 offset_in_output_section
,
2202 // Return the value to use for a dynamic which requires special
2203 // treatment. This is how we support equality comparisons of function
2204 // pointers across shared library boundaries, as described in the
2205 // processor specific ABI supplement.
2208 Target_x86_64::do_dynsym_value(const Symbol
* gsym
) const
2210 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
2211 return this->plt_section()->address() + gsym
->plt_offset();
2214 // Return a string used to fill a code section with nops to take up
2215 // the specified length.
2218 Target_x86_64::do_code_fill(section_size_type length
) const
2222 // Build a jmpq instruction to skip over the bytes.
2223 unsigned char jmp
[5];
2225 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
2226 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
2227 + std::string(length
- 5, '\0'));
2230 // Nop sequences of various lengths.
2231 const char nop1
[1] = { 0x90 }; // nop
2232 const char nop2
[2] = { 0x66, 0x90 }; // xchg %ax %ax
2233 const char nop3
[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
2234 const char nop4
[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
2235 const char nop5
[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
2236 0x00 }; // leal 0(%esi,1),%esi
2237 const char nop6
[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2239 const char nop7
[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2241 const char nop8
[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
2242 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
2243 const char nop9
[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
2244 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
2246 const char nop10
[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
2247 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
2249 const char nop11
[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
2250 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
2252 const char nop12
[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2253 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
2254 0x00, 0x00, 0x00, 0x00 };
2255 const char nop13
[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
2256 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
2257 0x27, 0x00, 0x00, 0x00,
2259 const char nop14
[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
2260 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
2261 0xbc, 0x27, 0x00, 0x00,
2263 const char nop15
[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
2264 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
2265 0x90, 0x90, 0x90, 0x90,
2268 const char* nops
[16] = {
2270 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
2271 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
2274 return std::string(nops
[length
], length
);
2277 // The selector for x86_64 object files.
2279 class Target_selector_x86_64
: public Target_selector
2282 Target_selector_x86_64()
2283 : Target_selector(elfcpp::EM_X86_64
, 64, false, "elf64-x86-64")
2287 do_instantiate_target()
2288 { return new Target_x86_64(); }
2291 Target_selector_x86_64 target_selector_x86_64
;
2293 } // End anonymous namespace.