1 // x86_64.cc -- x86_64 target support for gold.
3 // Copyright (C) 2006-2015 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.
29 #include "parameters.h"
36 #include "copy-relocs.h"
38 #include "target-reloc.h"
39 #include "target-select.h"
51 // A class to handle the .got.plt section.
53 class Output_data_got_plt_x86_64
: public Output_section_data_build
56 Output_data_got_plt_x86_64(Layout
* layout
)
57 : Output_section_data_build(8),
61 Output_data_got_plt_x86_64(Layout
* layout
, off_t data_size
)
62 : Output_section_data_build(data_size
, 8),
67 // Write out the PLT data.
69 do_write(Output_file
*);
71 // Write to a map file.
73 do_print_to_mapfile(Mapfile
* mapfile
) const
74 { mapfile
->print_output_data(this, "** GOT PLT"); }
77 // A pointer to the Layout class, so that we can find the .dynamic
78 // section when we write out the GOT PLT section.
82 // A class to handle the PLT data.
83 // This is an abstract base class that handles most of the linker details
84 // but does not know the actual contents of PLT entries. The derived
85 // classes below fill in those details.
88 class Output_data_plt_x86_64
: public Output_section_data
91 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, false> Reloc_section
;
93 Output_data_plt_x86_64(Layout
* layout
, uint64_t addralign
,
94 Output_data_got
<64, false>* got
,
95 Output_data_got_plt_x86_64
* got_plt
,
96 Output_data_space
* got_irelative
)
97 : Output_section_data(addralign
), tlsdesc_rel_(NULL
),
98 irelative_rel_(NULL
), got_(got
), got_plt_(got_plt
),
99 got_irelative_(got_irelative
), count_(0), irelative_count_(0),
100 tlsdesc_got_offset_(-1U), free_list_()
101 { this->init(layout
); }
103 Output_data_plt_x86_64(Layout
* layout
, uint64_t plt_entry_size
,
104 Output_data_got
<64, false>* got
,
105 Output_data_got_plt_x86_64
* got_plt
,
106 Output_data_space
* got_irelative
,
107 unsigned int plt_count
)
108 : Output_section_data((plt_count
+ 1) * plt_entry_size
,
109 plt_entry_size
, false),
110 tlsdesc_rel_(NULL
), irelative_rel_(NULL
), got_(got
),
111 got_plt_(got_plt
), got_irelative_(got_irelative
), count_(plt_count
),
112 irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
116 // Initialize the free list and reserve the first entry.
117 this->free_list_
.init((plt_count
+ 1) * plt_entry_size
, false);
118 this->free_list_
.remove(0, plt_entry_size
);
121 // Initialize the PLT section.
123 init(Layout
* layout
);
125 // Add an entry to the PLT.
127 add_entry(Symbol_table
*, Layout
*, Symbol
* gsym
);
129 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
131 add_local_ifunc_entry(Symbol_table
* symtab
, Layout
*,
132 Sized_relobj_file
<size
, false>* relobj
,
133 unsigned int local_sym_index
);
135 // Add the relocation for a PLT entry.
137 add_relocation(Symbol_table
*, Layout
*, Symbol
* gsym
,
138 unsigned int got_offset
);
140 // Add the reserved TLSDESC_PLT entry to the PLT.
142 reserve_tlsdesc_entry(unsigned int got_offset
)
143 { this->tlsdesc_got_offset_
= got_offset
; }
145 // Return true if a TLSDESC_PLT entry has been reserved.
147 has_tlsdesc_entry() const
148 { return this->tlsdesc_got_offset_
!= -1U; }
150 // Return the GOT offset for the reserved TLSDESC_PLT entry.
152 get_tlsdesc_got_offset() const
153 { return this->tlsdesc_got_offset_
; }
155 // Return the offset of the reserved TLSDESC_PLT entry.
157 get_tlsdesc_plt_offset() const
159 return ((this->count_
+ this->irelative_count_
+ 1)
160 * this->get_plt_entry_size());
163 // Return the .rela.plt section data.
166 { return this->rel_
; }
168 // Return where the TLSDESC relocations should go.
170 rela_tlsdesc(Layout
*);
172 // Return where the IRELATIVE relocations should go in the PLT
175 rela_irelative(Symbol_table
*, Layout
*);
177 // Return whether we created a section for IRELATIVE relocations.
179 has_irelative_section() const
180 { return this->irelative_rel_
!= NULL
; }
182 // Return the number of PLT entries.
185 { return this->count_
+ this->irelative_count_
; }
187 // Return the offset of the first non-reserved PLT entry.
189 first_plt_entry_offset()
190 { return this->get_plt_entry_size(); }
192 // Return the size of a PLT entry.
194 get_plt_entry_size() const
195 { return this->do_get_plt_entry_size(); }
197 // Reserve a slot in the PLT for an existing symbol in an incremental update.
199 reserve_slot(unsigned int plt_index
)
201 this->free_list_
.remove((plt_index
+ 1) * this->get_plt_entry_size(),
202 (plt_index
+ 2) * this->get_plt_entry_size());
205 // Return the PLT address to use for a global symbol.
207 address_for_global(const Symbol
*);
209 // Return the PLT address to use for a local symbol.
211 address_for_local(const Relobj
*, unsigned int symndx
);
213 // Add .eh_frame information for the PLT.
215 add_eh_frame(Layout
* layout
)
216 { this->do_add_eh_frame(layout
); }
219 // Fill in the first PLT entry.
221 fill_first_plt_entry(unsigned char* pov
,
222 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
223 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
)
224 { this->do_fill_first_plt_entry(pov
, got_address
, plt_address
); }
226 // Fill in a normal PLT entry. Returns the offset into the entry that
227 // should be the initial GOT slot value.
229 fill_plt_entry(unsigned char* pov
,
230 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
231 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
232 unsigned int got_offset
,
233 unsigned int plt_offset
,
234 unsigned int plt_index
)
236 return this->do_fill_plt_entry(pov
, got_address
, plt_address
,
237 got_offset
, plt_offset
, plt_index
);
240 // Fill in the reserved TLSDESC PLT entry.
242 fill_tlsdesc_entry(unsigned char* pov
,
243 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
244 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
245 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
,
246 unsigned int tlsdesc_got_offset
,
247 unsigned int plt_offset
)
249 this->do_fill_tlsdesc_entry(pov
, got_address
, plt_address
, got_base
,
250 tlsdesc_got_offset
, plt_offset
);
254 do_get_plt_entry_size() const = 0;
257 do_fill_first_plt_entry(unsigned char* pov
,
258 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_addr
,
259 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_addr
)
263 do_fill_plt_entry(unsigned char* pov
,
264 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
265 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
266 unsigned int got_offset
,
267 unsigned int plt_offset
,
268 unsigned int plt_index
) = 0;
271 do_fill_tlsdesc_entry(unsigned char* pov
,
272 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
273 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
274 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
,
275 unsigned int tlsdesc_got_offset
,
276 unsigned int plt_offset
) = 0;
279 do_add_eh_frame(Layout
* layout
) = 0;
282 do_adjust_output_section(Output_section
* os
);
284 // Write to a map file.
286 do_print_to_mapfile(Mapfile
* mapfile
) const
287 { mapfile
->print_output_data(this, _("** PLT")); }
289 // The CIE of the .eh_frame unwind information for the PLT.
290 static const int plt_eh_frame_cie_size
= 16;
291 static const unsigned char plt_eh_frame_cie
[plt_eh_frame_cie_size
];
294 // Set the final size.
296 set_final_data_size();
298 // Write out the PLT data.
300 do_write(Output_file
*);
302 // The reloc section.
304 // The TLSDESC relocs, if necessary. These must follow the regular
306 Reloc_section
* tlsdesc_rel_
;
307 // The IRELATIVE relocs, if necessary. These must follow the
308 // regular PLT relocations and the TLSDESC relocations.
309 Reloc_section
* irelative_rel_
;
311 Output_data_got
<64, false>* got_
;
312 // The .got.plt section.
313 Output_data_got_plt_x86_64
* got_plt_
;
314 // The part of the .got.plt section used for IRELATIVE relocs.
315 Output_data_space
* got_irelative_
;
316 // The number of PLT entries.
318 // Number of PLT entries with R_X86_64_IRELATIVE relocs. These
319 // follow the regular PLT entries.
320 unsigned int irelative_count_
;
321 // Offset of the reserved TLSDESC_GOT entry when needed.
322 unsigned int tlsdesc_got_offset_
;
323 // List of available regions within the section, for incremental
325 Free_list free_list_
;
329 class Output_data_plt_x86_64_standard
: public Output_data_plt_x86_64
<size
>
332 Output_data_plt_x86_64_standard(Layout
* layout
,
333 Output_data_got
<64, false>* got
,
334 Output_data_got_plt_x86_64
* got_plt
,
335 Output_data_space
* got_irelative
)
336 : Output_data_plt_x86_64
<size
>(layout
, plt_entry_size
,
337 got
, got_plt
, got_irelative
)
340 Output_data_plt_x86_64_standard(Layout
* layout
,
341 Output_data_got
<64, false>* got
,
342 Output_data_got_plt_x86_64
* got_plt
,
343 Output_data_space
* got_irelative
,
344 unsigned int plt_count
)
345 : Output_data_plt_x86_64
<size
>(layout
, plt_entry_size
,
346 got
, got_plt
, got_irelative
,
352 do_get_plt_entry_size() const
353 { return plt_entry_size
; }
356 do_add_eh_frame(Layout
* layout
)
358 layout
->add_eh_frame_for_plt(this,
359 this->plt_eh_frame_cie
,
360 this->plt_eh_frame_cie_size
,
362 plt_eh_frame_fde_size
);
366 do_fill_first_plt_entry(unsigned char* pov
,
367 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_addr
,
368 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_addr
);
371 do_fill_plt_entry(unsigned char* pov
,
372 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
373 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
374 unsigned int got_offset
,
375 unsigned int plt_offset
,
376 unsigned int plt_index
);
379 do_fill_tlsdesc_entry(unsigned char* pov
,
380 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
381 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
382 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
,
383 unsigned int tlsdesc_got_offset
,
384 unsigned int plt_offset
);
387 // The size of an entry in the PLT.
388 static const int plt_entry_size
= 16;
390 // The first entry in the PLT.
391 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
392 // procedure linkage table for both programs and shared objects."
393 static const unsigned char first_plt_entry
[plt_entry_size
];
395 // Other entries in the PLT for an executable.
396 static const unsigned char plt_entry
[plt_entry_size
];
398 // The reserved TLSDESC entry in the PLT for an executable.
399 static const unsigned char tlsdesc_plt_entry
[plt_entry_size
];
401 // The .eh_frame unwind information for the PLT.
402 static const int plt_eh_frame_fde_size
= 32;
403 static const unsigned char plt_eh_frame_fde
[plt_eh_frame_fde_size
];
406 // The x86_64 target class.
408 // http://www.x86-64.org/documentation/abi.pdf
409 // TLS info comes from
410 // http://people.redhat.com/drepper/tls.pdf
411 // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
414 class Target_x86_64
: public Sized_target
<size
, false>
417 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
418 // uses only Elf64_Rela relocation entries with explicit addends."
419 typedef Output_data_reloc
<elfcpp::SHT_RELA
, true, size
, false> Reloc_section
;
421 Target_x86_64(const Target::Target_info
* info
= &x86_64_info
)
422 : Sized_target
<size
, false>(info
),
423 got_(NULL
), plt_(NULL
), got_plt_(NULL
), got_irelative_(NULL
),
424 got_tlsdesc_(NULL
), global_offset_table_(NULL
), rela_dyn_(NULL
),
425 rela_irelative_(NULL
), copy_relocs_(elfcpp::R_X86_64_COPY
),
426 got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
427 tls_base_symbol_defined_(false)
430 // Hook for a new output section.
432 do_new_output_section(Output_section
*) const;
434 // Scan the relocations to look for symbol adjustments.
436 gc_process_relocs(Symbol_table
* symtab
,
438 Sized_relobj_file
<size
, false>* object
,
439 unsigned int data_shndx
,
440 unsigned int sh_type
,
441 const unsigned char* prelocs
,
443 Output_section
* output_section
,
444 bool needs_special_offset_handling
,
445 size_t local_symbol_count
,
446 const unsigned char* plocal_symbols
);
448 // Scan the relocations to look for symbol adjustments.
450 scan_relocs(Symbol_table
* symtab
,
452 Sized_relobj_file
<size
, false>* object
,
453 unsigned int data_shndx
,
454 unsigned int sh_type
,
455 const unsigned char* prelocs
,
457 Output_section
* output_section
,
458 bool needs_special_offset_handling
,
459 size_t local_symbol_count
,
460 const unsigned char* plocal_symbols
);
462 // Finalize the sections.
464 do_finalize_sections(Layout
*, const Input_objects
*, Symbol_table
*);
466 // Return the value to use for a dynamic which requires special
469 do_dynsym_value(const Symbol
*) const;
471 // Relocate a section.
473 relocate_section(const Relocate_info
<size
, false>*,
474 unsigned int sh_type
,
475 const unsigned char* prelocs
,
477 Output_section
* output_section
,
478 bool needs_special_offset_handling
,
480 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
481 section_size_type view_size
,
482 const Reloc_symbol_changes
*);
484 // Scan the relocs during a relocatable link.
486 scan_relocatable_relocs(Symbol_table
* symtab
,
488 Sized_relobj_file
<size
, false>* object
,
489 unsigned int data_shndx
,
490 unsigned int sh_type
,
491 const unsigned char* prelocs
,
493 Output_section
* output_section
,
494 bool needs_special_offset_handling
,
495 size_t local_symbol_count
,
496 const unsigned char* plocal_symbols
,
497 Relocatable_relocs
*);
499 // Emit relocations for a section.
502 const Relocate_info
<size
, false>*,
503 unsigned int sh_type
,
504 const unsigned char* prelocs
,
506 Output_section
* output_section
,
507 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
508 const Relocatable_relocs
*,
510 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
511 section_size_type view_size
,
512 unsigned char* reloc_view
,
513 section_size_type reloc_view_size
);
515 // Return a string used to fill a code section with nops.
517 do_code_fill(section_size_type length
) const;
519 // Return whether SYM is defined by the ABI.
521 do_is_defined_by_abi(const Symbol
* sym
) const
522 { return strcmp(sym
->name(), "__tls_get_addr") == 0; }
524 // Return the symbol index to use for a target specific relocation.
525 // The only target specific relocation is R_X86_64_TLSDESC for a
526 // local symbol, which is an absolute reloc.
528 do_reloc_symbol_index(void*, unsigned int r_type
) const
530 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC
);
534 // Return the addend to use for a target specific relocation.
536 do_reloc_addend(void* arg
, unsigned int r_type
, uint64_t addend
) const;
538 // Return the PLT section.
540 do_plt_address_for_global(const Symbol
* gsym
) const
541 { return this->plt_section()->address_for_global(gsym
); }
544 do_plt_address_for_local(const Relobj
* relobj
, unsigned int symndx
) const
545 { return this->plt_section()->address_for_local(relobj
, symndx
); }
547 // This function should be defined in targets that can use relocation
548 // types to determine (implemented in local_reloc_may_be_function_pointer
549 // and global_reloc_may_be_function_pointer)
550 // if a function's pointer is taken. ICF uses this in safe mode to only
551 // fold those functions whose pointer is defintely not taken. For x86_64
552 // pie binaries, safe ICF cannot be done by looking at relocation types.
554 do_can_check_for_function_pointers() const
555 { return !parameters
->options().pie(); }
557 // Return the base for a DW_EH_PE_datarel encoding.
559 do_ehframe_datarel_base() const;
561 // Adjust -fsplit-stack code which calls non-split-stack code.
563 do_calls_non_split(Relobj
* object
, unsigned int shndx
,
564 section_offset_type fnoffset
, section_size_type fnsize
,
565 unsigned char* view
, section_size_type view_size
,
566 std::string
* from
, std::string
* to
) const;
568 // Return the size of the GOT section.
572 gold_assert(this->got_
!= NULL
);
573 return this->got_
->data_size();
576 // Return the number of entries in the GOT.
578 got_entry_count() const
580 if (this->got_
== NULL
)
582 return this->got_size() / 8;
585 // Return the number of entries in the PLT.
587 plt_entry_count() const;
589 // Return the offset of the first non-reserved PLT entry.
591 first_plt_entry_offset() const;
593 // Return the size of each PLT entry.
595 plt_entry_size() const;
597 // Create the GOT section for an incremental update.
598 Output_data_got_base
*
599 init_got_plt_for_update(Symbol_table
* symtab
,
601 unsigned int got_count
,
602 unsigned int plt_count
);
604 // Reserve a GOT entry for a local symbol, and regenerate any
605 // necessary dynamic relocations.
607 reserve_local_got_entry(unsigned int got_index
,
608 Sized_relobj
<size
, false>* obj
,
610 unsigned int got_type
);
612 // Reserve a GOT entry for a global symbol, and regenerate any
613 // necessary dynamic relocations.
615 reserve_global_got_entry(unsigned int got_index
, Symbol
* gsym
,
616 unsigned int got_type
);
618 // Register an existing PLT entry for a global symbol.
620 register_global_plt_entry(Symbol_table
*, Layout
*, unsigned int plt_index
,
623 // Force a COPY relocation for a given symbol.
625 emit_copy_reloc(Symbol_table
*, Symbol
*, Output_section
*, off_t
);
627 // Apply an incremental relocation.
629 apply_relocation(const Relocate_info
<size
, false>* relinfo
,
630 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
632 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
635 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
636 section_size_type view_size
);
638 // Add a new reloc argument, returning the index in the vector.
640 add_tlsdesc_info(Sized_relobj_file
<size
, false>* object
, unsigned int r_sym
)
642 this->tlsdesc_reloc_info_
.push_back(Tlsdesc_info(object
, r_sym
));
643 return this->tlsdesc_reloc_info_
.size() - 1;
646 Output_data_plt_x86_64
<size
>*
647 make_data_plt(Layout
* layout
,
648 Output_data_got
<64, false>* got
,
649 Output_data_got_plt_x86_64
* got_plt
,
650 Output_data_space
* got_irelative
)
652 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
);
655 Output_data_plt_x86_64
<size
>*
656 make_data_plt(Layout
* layout
,
657 Output_data_got
<64, false>* got
,
658 Output_data_got_plt_x86_64
* got_plt
,
659 Output_data_space
* got_irelative
,
660 unsigned int plt_count
)
662 return this->do_make_data_plt(layout
, got
, got_plt
, got_irelative
,
666 virtual Output_data_plt_x86_64
<size
>*
667 do_make_data_plt(Layout
* layout
,
668 Output_data_got
<64, false>* got
,
669 Output_data_got_plt_x86_64
* got_plt
,
670 Output_data_space
* got_irelative
)
672 return new Output_data_plt_x86_64_standard
<size
>(layout
, got
, got_plt
,
676 virtual Output_data_plt_x86_64
<size
>*
677 do_make_data_plt(Layout
* layout
,
678 Output_data_got
<64, false>* got
,
679 Output_data_got_plt_x86_64
* got_plt
,
680 Output_data_space
* got_irelative
,
681 unsigned int plt_count
)
683 return new Output_data_plt_x86_64_standard
<size
>(layout
, got
, got_plt
,
689 // The class which scans relocations.
694 : issued_non_pic_error_(false)
698 get_reference_flags(unsigned int r_type
);
701 local(Symbol_table
* symtab
, Layout
* layout
, Target_x86_64
* target
,
702 Sized_relobj_file
<size
, false>* object
,
703 unsigned int data_shndx
,
704 Output_section
* output_section
,
705 const elfcpp::Rela
<size
, false>& reloc
, unsigned int r_type
,
706 const elfcpp::Sym
<size
, false>& lsym
,
710 global(Symbol_table
* symtab
, Layout
* layout
, Target_x86_64
* target
,
711 Sized_relobj_file
<size
, false>* object
,
712 unsigned int data_shndx
,
713 Output_section
* output_section
,
714 const elfcpp::Rela
<size
, false>& reloc
, unsigned int r_type
,
718 local_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
719 Target_x86_64
* target
,
720 Sized_relobj_file
<size
, false>* object
,
721 unsigned int data_shndx
,
722 Output_section
* output_section
,
723 const elfcpp::Rela
<size
, false>& reloc
,
725 const elfcpp::Sym
<size
, false>& lsym
);
728 global_reloc_may_be_function_pointer(Symbol_table
* symtab
, Layout
* layout
,
729 Target_x86_64
* target
,
730 Sized_relobj_file
<size
, false>* object
,
731 unsigned int data_shndx
,
732 Output_section
* output_section
,
733 const elfcpp::Rela
<size
, false>& reloc
,
739 unsupported_reloc_local(Sized_relobj_file
<size
, false>*,
740 unsigned int r_type
);
743 unsupported_reloc_global(Sized_relobj_file
<size
, false>*,
744 unsigned int r_type
, Symbol
*);
747 check_non_pic(Relobj
*, unsigned int r_type
, Symbol
*);
750 possible_function_pointer_reloc(unsigned int r_type
);
753 reloc_needs_plt_for_ifunc(Sized_relobj_file
<size
, false>*,
754 unsigned int r_type
);
756 // Whether we have issued an error about a non-PIC compilation.
757 bool issued_non_pic_error_
;
760 // The class which implements relocation.
765 : skip_call_tls_get_addr_(false)
770 if (this->skip_call_tls_get_addr_
)
772 // FIXME: This needs to specify the location somehow.
773 gold_error(_("missing expected TLS relocation"));
777 // Do a relocation. Return false if the caller should not issue
778 // any warnings about this relocation.
780 relocate(const Relocate_info
<size
, false>*, Target_x86_64
*,
782 size_t relnum
, const elfcpp::Rela
<size
, false>&,
783 unsigned int r_type
, const Sized_symbol
<size
>*,
784 const Symbol_value
<size
>*,
785 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
789 // Do a TLS relocation.
791 relocate_tls(const Relocate_info
<size
, false>*, Target_x86_64
*,
792 size_t relnum
, const elfcpp::Rela
<size
, false>&,
793 unsigned int r_type
, const Sized_symbol
<size
>*,
794 const Symbol_value
<size
>*,
795 unsigned char*, typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
798 // Do a TLS General-Dynamic to Initial-Exec transition.
800 tls_gd_to_ie(const Relocate_info
<size
, false>*, size_t relnum
,
801 Output_segment
* tls_segment
,
802 const elfcpp::Rela
<size
, false>&, unsigned int r_type
,
803 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
805 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
806 section_size_type view_size
);
808 // Do a TLS General-Dynamic to Local-Exec transition.
810 tls_gd_to_le(const Relocate_info
<size
, false>*, size_t relnum
,
811 Output_segment
* tls_segment
,
812 const elfcpp::Rela
<size
, false>&, unsigned int r_type
,
813 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
815 section_size_type view_size
);
817 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
819 tls_desc_gd_to_ie(const Relocate_info
<size
, false>*, size_t relnum
,
820 Output_segment
* tls_segment
,
821 const elfcpp::Rela
<size
, false>&, unsigned int r_type
,
822 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
824 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
825 section_size_type view_size
);
827 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
829 tls_desc_gd_to_le(const Relocate_info
<size
, false>*, size_t relnum
,
830 Output_segment
* tls_segment
,
831 const elfcpp::Rela
<size
, false>&, unsigned int r_type
,
832 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
834 section_size_type view_size
);
836 // Do a TLS Local-Dynamic to Local-Exec transition.
838 tls_ld_to_le(const Relocate_info
<size
, false>*, size_t relnum
,
839 Output_segment
* tls_segment
,
840 const elfcpp::Rela
<size
, false>&, unsigned int r_type
,
841 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
843 section_size_type view_size
);
845 // Do a TLS Initial-Exec to Local-Exec transition.
847 tls_ie_to_le(const Relocate_info
<size
, false>*, size_t relnum
,
848 Output_segment
* tls_segment
,
849 const elfcpp::Rela
<size
, false>&, unsigned int r_type
,
850 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
852 section_size_type view_size
);
854 // This is set if we should skip the next reloc, which should be a
855 // PLT32 reloc against ___tls_get_addr.
856 bool skip_call_tls_get_addr_
;
859 // A class which returns the size required for a relocation type,
860 // used while scanning relocs during a relocatable link.
861 class Relocatable_size_for_reloc
865 get_size_for_reloc(unsigned int, Relobj
*);
868 // Check if relocation against this symbol is a candidate for
870 // mov foo@GOTPCREL(%rip), %reg
871 // to lea foo(%rip), %reg.
873 can_convert_mov_to_lea(const Symbol
* gsym
)
875 gold_assert(gsym
!= NULL
);
876 return (gsym
->type() != elfcpp::STT_GNU_IFUNC
877 && !gsym
->is_undefined ()
878 && !gsym
->is_from_dynobj()
879 && !gsym
->is_preemptible()
880 && (!parameters
->options().shared()
881 || (gsym
->visibility() != elfcpp::STV_DEFAULT
882 && gsym
->visibility() != elfcpp::STV_PROTECTED
)
883 || parameters
->options().Bsymbolic())
884 && strcmp(gsym
->name(), "_DYNAMIC") != 0);
887 // Adjust TLS relocation type based on the options and whether this
888 // is a local symbol.
889 static tls::Tls_optimization
890 optimize_tls_reloc(bool is_final
, int r_type
);
892 // Get the GOT section, creating it if necessary.
893 Output_data_got
<64, false>*
894 got_section(Symbol_table
*, Layout
*);
896 // Get the GOT PLT section.
897 Output_data_got_plt_x86_64
*
898 got_plt_section() const
900 gold_assert(this->got_plt_
!= NULL
);
901 return this->got_plt_
;
904 // Get the GOT section for TLSDESC entries.
905 Output_data_got
<64, false>*
906 got_tlsdesc_section() const
908 gold_assert(this->got_tlsdesc_
!= NULL
);
909 return this->got_tlsdesc_
;
912 // Create the PLT section.
914 make_plt_section(Symbol_table
* symtab
, Layout
* layout
);
916 // Create a PLT entry for a global symbol.
918 make_plt_entry(Symbol_table
*, Layout
*, Symbol
*);
920 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
922 make_local_ifunc_plt_entry(Symbol_table
*, Layout
*,
923 Sized_relobj_file
<size
, false>* relobj
,
924 unsigned int local_sym_index
);
926 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
928 define_tls_base_symbol(Symbol_table
*, Layout
*);
930 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
932 reserve_tlsdesc_entries(Symbol_table
* symtab
, Layout
* layout
);
934 // Create a GOT entry for the TLS module index.
936 got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
937 Sized_relobj_file
<size
, false>* object
);
939 // Get the PLT section.
940 Output_data_plt_x86_64
<size
>*
943 gold_assert(this->plt_
!= NULL
);
947 // Get the dynamic reloc section, creating it if necessary.
949 rela_dyn_section(Layout
*);
951 // Get the section to use for TLSDESC relocations.
953 rela_tlsdesc_section(Layout
*) const;
955 // Get the section to use for IRELATIVE relocations.
957 rela_irelative_section(Layout
*);
959 // Add a potential copy relocation.
961 copy_reloc(Symbol_table
* symtab
, Layout
* layout
,
962 Sized_relobj_file
<size
, false>* object
,
963 unsigned int shndx
, Output_section
* output_section
,
964 Symbol
* sym
, const elfcpp::Rela
<size
, false>& reloc
)
966 this->copy_relocs_
.copy_reloc(symtab
, layout
,
967 symtab
->get_sized_symbol
<size
>(sym
),
968 object
, shndx
, output_section
,
969 reloc
, this->rela_dyn_section(layout
));
972 // Information about this specific target which we pass to the
973 // general Target structure.
974 static const Target::Target_info x86_64_info
;
976 // The types of GOT entries needed for this platform.
977 // These values are exposed to the ABI in an incremental link.
978 // Do not renumber existing values without changing the version
979 // number of the .gnu_incremental_inputs section.
982 GOT_TYPE_STANDARD
= 0, // GOT entry for a regular symbol
983 GOT_TYPE_TLS_OFFSET
= 1, // GOT entry for TLS offset
984 GOT_TYPE_TLS_PAIR
= 2, // GOT entry for TLS module/offset pair
985 GOT_TYPE_TLS_DESC
= 3 // GOT entry for TLS_DESC pair
988 // This type is used as the argument to the target specific
989 // relocation routines. The only target specific reloc is
990 // R_X86_64_TLSDESC against a local symbol.
993 Tlsdesc_info(Sized_relobj_file
<size
, false>* a_object
, unsigned int a_r_sym
)
994 : object(a_object
), r_sym(a_r_sym
)
997 // The object in which the local symbol is defined.
998 Sized_relobj_file
<size
, false>* object
;
999 // The local symbol index in the object.
1004 Output_data_got
<64, false>* got_
;
1006 Output_data_plt_x86_64
<size
>* plt_
;
1007 // The GOT PLT section.
1008 Output_data_got_plt_x86_64
* got_plt_
;
1009 // The GOT section for IRELATIVE relocations.
1010 Output_data_space
* got_irelative_
;
1011 // The GOT section for TLSDESC relocations.
1012 Output_data_got
<64, false>* got_tlsdesc_
;
1013 // The _GLOBAL_OFFSET_TABLE_ symbol.
1014 Symbol
* global_offset_table_
;
1015 // The dynamic reloc section.
1016 Reloc_section
* rela_dyn_
;
1017 // The section to use for IRELATIVE relocs.
1018 Reloc_section
* rela_irelative_
;
1019 // Relocs saved to avoid a COPY reloc.
1020 Copy_relocs
<elfcpp::SHT_RELA
, size
, false> copy_relocs_
;
1021 // Offset of the GOT entry for the TLS module index.
1022 unsigned int got_mod_index_offset_
;
1023 // We handle R_X86_64_TLSDESC against a local symbol as a target
1024 // specific relocation. Here we store the object and local symbol
1025 // index for the relocation.
1026 std::vector
<Tlsdesc_info
> tlsdesc_reloc_info_
;
1027 // True if the _TLS_MODULE_BASE_ symbol has been defined.
1028 bool tls_base_symbol_defined_
;
1032 const Target::Target_info Target_x86_64
<64>::x86_64_info
=
1035 false, // is_big_endian
1036 elfcpp::EM_X86_64
, // machine_code
1037 false, // has_make_symbol
1038 false, // has_resolve
1039 true, // has_code_fill
1040 true, // is_default_stack_executable
1041 true, // can_icf_inline_merge_sections
1043 "/lib/ld64.so.1", // program interpreter
1044 0x400000, // default_text_segment_address
1045 0x1000, // abi_pagesize (overridable by -z max-page-size)
1046 0x1000, // common_pagesize (overridable by -z common-page-size)
1047 false, // isolate_execinstr
1049 elfcpp::SHN_UNDEF
, // small_common_shndx
1050 elfcpp::SHN_X86_64_LCOMMON
, // large_common_shndx
1051 0, // small_common_section_flags
1052 elfcpp::SHF_X86_64_LARGE
, // large_common_section_flags
1053 NULL
, // attributes_section
1054 NULL
, // attributes_vendor
1055 "_start", // entry_symbol_name
1056 32, // hash_entry_size
1060 const Target::Target_info Target_x86_64
<32>::x86_64_info
=
1063 false, // is_big_endian
1064 elfcpp::EM_X86_64
, // machine_code
1065 false, // has_make_symbol
1066 false, // has_resolve
1067 true, // has_code_fill
1068 true, // is_default_stack_executable
1069 true, // can_icf_inline_merge_sections
1071 "/libx32/ldx32.so.1", // program interpreter
1072 0x400000, // default_text_segment_address
1073 0x1000, // abi_pagesize (overridable by -z max-page-size)
1074 0x1000, // common_pagesize (overridable by -z common-page-size)
1075 false, // isolate_execinstr
1077 elfcpp::SHN_UNDEF
, // small_common_shndx
1078 elfcpp::SHN_X86_64_LCOMMON
, // large_common_shndx
1079 0, // small_common_section_flags
1080 elfcpp::SHF_X86_64_LARGE
, // large_common_section_flags
1081 NULL
, // attributes_section
1082 NULL
, // attributes_vendor
1083 "_start", // entry_symbol_name
1084 32, // hash_entry_size
1087 // This is called when a new output section is created. This is where
1088 // we handle the SHF_X86_64_LARGE.
1092 Target_x86_64
<size
>::do_new_output_section(Output_section
* os
) const
1094 if ((os
->flags() & elfcpp::SHF_X86_64_LARGE
) != 0)
1095 os
->set_is_large_section();
1098 // Get the GOT section, creating it if necessary.
1101 Output_data_got
<64, false>*
1102 Target_x86_64
<size
>::got_section(Symbol_table
* symtab
, Layout
* layout
)
1104 if (this->got_
== NULL
)
1106 gold_assert(symtab
!= NULL
&& layout
!= NULL
);
1108 // When using -z now, we can treat .got.plt as a relro section.
1109 // Without -z now, it is modified after program startup by lazy
1111 bool is_got_plt_relro
= parameters
->options().now();
1112 Output_section_order got_order
= (is_got_plt_relro
1114 : ORDER_RELRO_LAST
);
1115 Output_section_order got_plt_order
= (is_got_plt_relro
1117 : ORDER_NON_RELRO_FIRST
);
1119 this->got_
= new Output_data_got
<64, false>();
1121 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1123 | elfcpp::SHF_WRITE
),
1124 this->got_
, got_order
, true);
1126 this->got_plt_
= new Output_data_got_plt_x86_64(layout
);
1127 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
1129 | elfcpp::SHF_WRITE
),
1130 this->got_plt_
, got_plt_order
,
1133 // The first three entries are reserved.
1134 this->got_plt_
->set_current_data_size(3 * 8);
1136 if (!is_got_plt_relro
)
1138 // Those bytes can go into the relro segment.
1139 layout
->increase_relro(3 * 8);
1142 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1143 this->global_offset_table_
=
1144 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
1145 Symbol_table::PREDEFINED
,
1147 0, 0, elfcpp::STT_OBJECT
,
1149 elfcpp::STV_HIDDEN
, 0,
1152 // If there are any IRELATIVE relocations, they get GOT entries
1153 // in .got.plt after the jump slot entries.
1154 this->got_irelative_
= new Output_data_space(8, "** GOT IRELATIVE PLT");
1155 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
1157 | elfcpp::SHF_WRITE
),
1158 this->got_irelative_
,
1159 got_plt_order
, is_got_plt_relro
);
1161 // If there are any TLSDESC relocations, they get GOT entries in
1162 // .got.plt after the jump slot and IRELATIVE entries.
1163 this->got_tlsdesc_
= new Output_data_got
<64, false>();
1164 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
1166 | elfcpp::SHF_WRITE
),
1168 got_plt_order
, is_got_plt_relro
);
1174 // Get the dynamic reloc section, creating it if necessary.
1177 typename Target_x86_64
<size
>::Reloc_section
*
1178 Target_x86_64
<size
>::rela_dyn_section(Layout
* layout
)
1180 if (this->rela_dyn_
== NULL
)
1182 gold_assert(layout
!= NULL
);
1183 this->rela_dyn_
= new Reloc_section(parameters
->options().combreloc());
1184 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
1185 elfcpp::SHF_ALLOC
, this->rela_dyn_
,
1186 ORDER_DYNAMIC_RELOCS
, false);
1188 return this->rela_dyn_
;
1191 // Get the section to use for IRELATIVE relocs, creating it if
1192 // necessary. These go in .rela.dyn, but only after all other dynamic
1193 // relocations. They need to follow the other dynamic relocations so
1194 // that they can refer to global variables initialized by those
1198 typename Target_x86_64
<size
>::Reloc_section
*
1199 Target_x86_64
<size
>::rela_irelative_section(Layout
* layout
)
1201 if (this->rela_irelative_
== NULL
)
1203 // Make sure we have already created the dynamic reloc section.
1204 this->rela_dyn_section(layout
);
1205 this->rela_irelative_
= new Reloc_section(false);
1206 layout
->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA
,
1207 elfcpp::SHF_ALLOC
, this->rela_irelative_
,
1208 ORDER_DYNAMIC_RELOCS
, false);
1209 gold_assert(this->rela_dyn_
->output_section()
1210 == this->rela_irelative_
->output_section());
1212 return this->rela_irelative_
;
1215 // Write the first three reserved words of the .got.plt section.
1216 // The remainder of the section is written while writing the PLT
1217 // in Output_data_plt_i386::do_write.
1220 Output_data_got_plt_x86_64::do_write(Output_file
* of
)
1222 // The first entry in the GOT is the address of the .dynamic section
1223 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1224 // We saved space for them when we created the section in
1225 // Target_x86_64::got_section.
1226 const off_t got_file_offset
= this->offset();
1227 gold_assert(this->data_size() >= 24);
1228 unsigned char* const got_view
= of
->get_output_view(got_file_offset
, 24);
1229 Output_section
* dynamic
= this->layout_
->dynamic_section();
1230 uint64_t dynamic_addr
= dynamic
== NULL
? 0 : dynamic
->address();
1231 elfcpp::Swap
<64, false>::writeval(got_view
, dynamic_addr
);
1232 memset(got_view
+ 8, 0, 16);
1233 of
->write_output_view(got_file_offset
, 24, got_view
);
1236 // Initialize the PLT section.
1240 Output_data_plt_x86_64
<size
>::init(Layout
* layout
)
1242 this->rel_
= new Reloc_section(false);
1243 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
1244 elfcpp::SHF_ALLOC
, this->rel_
,
1245 ORDER_DYNAMIC_PLT_RELOCS
, false);
1250 Output_data_plt_x86_64
<size
>::do_adjust_output_section(Output_section
* os
)
1252 os
->set_entsize(this->get_plt_entry_size());
1255 // Add an entry to the PLT.
1259 Output_data_plt_x86_64
<size
>::add_entry(Symbol_table
* symtab
, Layout
* layout
,
1262 gold_assert(!gsym
->has_plt_offset());
1264 unsigned int plt_index
;
1266 section_offset_type got_offset
;
1268 unsigned int* pcount
;
1269 unsigned int offset
;
1270 unsigned int reserved
;
1271 Output_section_data_build
* got
;
1272 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1273 && gsym
->can_use_relative_reloc(false))
1275 pcount
= &this->irelative_count_
;
1278 got
= this->got_irelative_
;
1282 pcount
= &this->count_
;
1285 got
= this->got_plt_
;
1288 if (!this->is_data_size_valid())
1290 // Note that when setting the PLT offset for a non-IRELATIVE
1291 // entry we skip the initial reserved PLT entry.
1292 plt_index
= *pcount
+ offset
;
1293 plt_offset
= plt_index
* this->get_plt_entry_size();
1297 got_offset
= (plt_index
- offset
+ reserved
) * 8;
1298 gold_assert(got_offset
== got
->current_data_size());
1300 // Every PLT entry needs a GOT entry which points back to the PLT
1301 // entry (this will be changed by the dynamic linker, normally
1302 // lazily when the function is called).
1303 got
->set_current_data_size(got_offset
+ 8);
1307 // FIXME: This is probably not correct for IRELATIVE relocs.
1309 // For incremental updates, find an available slot.
1310 plt_offset
= this->free_list_
.allocate(this->get_plt_entry_size(),
1311 this->get_plt_entry_size(), 0);
1312 if (plt_offset
== -1)
1313 gold_fallback(_("out of patch space (PLT);"
1314 " relink with --incremental-full"));
1316 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1317 // can be calculated from the PLT index, adjusting for the three
1318 // reserved entries at the beginning of the GOT.
1319 plt_index
= plt_offset
/ this->get_plt_entry_size() - 1;
1320 got_offset
= (plt_index
- offset
+ reserved
) * 8;
1323 gsym
->set_plt_offset(plt_offset
);
1325 // Every PLT entry needs a reloc.
1326 this->add_relocation(symtab
, layout
, gsym
, got_offset
);
1328 // Note that we don't need to save the symbol. The contents of the
1329 // PLT are independent of which symbols are used. The symbols only
1330 // appear in the relocations.
1333 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1338 Output_data_plt_x86_64
<size
>::add_local_ifunc_entry(
1339 Symbol_table
* symtab
,
1341 Sized_relobj_file
<size
, false>* relobj
,
1342 unsigned int local_sym_index
)
1344 unsigned int plt_offset
= this->irelative_count_
* this->get_plt_entry_size();
1345 ++this->irelative_count_
;
1347 section_offset_type got_offset
= this->got_irelative_
->current_data_size();
1349 // Every PLT entry needs a GOT entry which points back to the PLT
1351 this->got_irelative_
->set_current_data_size(got_offset
+ 8);
1353 // Every PLT entry needs a reloc.
1354 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
1355 rela
->add_symbolless_local_addend(relobj
, local_sym_index
,
1356 elfcpp::R_X86_64_IRELATIVE
,
1357 this->got_irelative_
, got_offset
, 0);
1362 // Add the relocation for a PLT entry.
1366 Output_data_plt_x86_64
<size
>::add_relocation(Symbol_table
* symtab
,
1369 unsigned int got_offset
)
1371 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1372 && gsym
->can_use_relative_reloc(false))
1374 Reloc_section
* rela
= this->rela_irelative(symtab
, layout
);
1375 rela
->add_symbolless_global_addend(gsym
, elfcpp::R_X86_64_IRELATIVE
,
1376 this->got_irelative_
, got_offset
, 0);
1380 gsym
->set_needs_dynsym_entry();
1381 this->rel_
->add_global(gsym
, elfcpp::R_X86_64_JUMP_SLOT
, this->got_plt_
,
1386 // Return where the TLSDESC relocations should go, creating it if
1387 // necessary. These follow the JUMP_SLOT relocations.
1390 typename Output_data_plt_x86_64
<size
>::Reloc_section
*
1391 Output_data_plt_x86_64
<size
>::rela_tlsdesc(Layout
* layout
)
1393 if (this->tlsdesc_rel_
== NULL
)
1395 this->tlsdesc_rel_
= new Reloc_section(false);
1396 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
1397 elfcpp::SHF_ALLOC
, this->tlsdesc_rel_
,
1398 ORDER_DYNAMIC_PLT_RELOCS
, false);
1399 gold_assert(this->tlsdesc_rel_
->output_section()
1400 == this->rel_
->output_section());
1402 return this->tlsdesc_rel_
;
1405 // Return where the IRELATIVE relocations should go in the PLT. These
1406 // follow the JUMP_SLOT and the TLSDESC relocations.
1409 typename Output_data_plt_x86_64
<size
>::Reloc_section
*
1410 Output_data_plt_x86_64
<size
>::rela_irelative(Symbol_table
* symtab
,
1413 if (this->irelative_rel_
== NULL
)
1415 // Make sure we have a place for the TLSDESC relocations, in
1416 // case we see any later on.
1417 this->rela_tlsdesc(layout
);
1418 this->irelative_rel_
= new Reloc_section(false);
1419 layout
->add_output_section_data(".rela.plt", elfcpp::SHT_RELA
,
1420 elfcpp::SHF_ALLOC
, this->irelative_rel_
,
1421 ORDER_DYNAMIC_PLT_RELOCS
, false);
1422 gold_assert(this->irelative_rel_
->output_section()
1423 == this->rel_
->output_section());
1425 if (parameters
->doing_static_link())
1427 // A statically linked executable will only have a .rela.plt
1428 // section to hold R_X86_64_IRELATIVE relocs for
1429 // STT_GNU_IFUNC symbols. The library will use these
1430 // symbols to locate the IRELATIVE relocs at program startup
1432 symtab
->define_in_output_data("__rela_iplt_start", NULL
,
1433 Symbol_table::PREDEFINED
,
1434 this->irelative_rel_
, 0, 0,
1435 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
1436 elfcpp::STV_HIDDEN
, 0, false, true);
1437 symtab
->define_in_output_data("__rela_iplt_end", NULL
,
1438 Symbol_table::PREDEFINED
,
1439 this->irelative_rel_
, 0, 0,
1440 elfcpp::STT_NOTYPE
, elfcpp::STB_GLOBAL
,
1441 elfcpp::STV_HIDDEN
, 0, true, true);
1444 return this->irelative_rel_
;
1447 // Return the PLT address to use for a global symbol.
1451 Output_data_plt_x86_64
<size
>::address_for_global(const Symbol
* gsym
)
1453 uint64_t offset
= 0;
1454 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
1455 && gsym
->can_use_relative_reloc(false))
1456 offset
= (this->count_
+ 1) * this->get_plt_entry_size();
1457 return this->address() + offset
+ gsym
->plt_offset();
1460 // Return the PLT address to use for a local symbol. These are always
1461 // IRELATIVE relocs.
1465 Output_data_plt_x86_64
<size
>::address_for_local(const Relobj
* object
,
1468 return (this->address()
1469 + (this->count_
+ 1) * this->get_plt_entry_size()
1470 + object
->local_plt_offset(r_sym
));
1473 // Set the final size.
1476 Output_data_plt_x86_64
<size
>::set_final_data_size()
1478 unsigned int count
= this->count_
+ this->irelative_count_
;
1479 if (this->has_tlsdesc_entry())
1481 this->set_data_size((count
+ 1) * this->get_plt_entry_size());
1484 // The first entry in the PLT for an executable.
1488 Output_data_plt_x86_64_standard
<size
>::first_plt_entry
[plt_entry_size
] =
1490 // From AMD64 ABI Draft 0.98, page 76
1491 0xff, 0x35, // pushq contents of memory address
1492 0, 0, 0, 0, // replaced with address of .got + 8
1493 0xff, 0x25, // jmp indirect
1494 0, 0, 0, 0, // replaced with address of .got + 16
1495 0x90, 0x90, 0x90, 0x90 // noop (x4)
1500 Output_data_plt_x86_64_standard
<size
>::do_fill_first_plt_entry(
1502 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
1503 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
)
1505 memcpy(pov
, first_plt_entry
, plt_entry_size
);
1506 // We do a jmp relative to the PC at the end of this instruction.
1507 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
1509 - (plt_address
+ 6)));
1510 elfcpp::Swap
<32, false>::writeval(pov
+ 8,
1512 - (plt_address
+ 12)));
1515 // Subsequent entries in the PLT for an executable.
1519 Output_data_plt_x86_64_standard
<size
>::plt_entry
[plt_entry_size
] =
1521 // From AMD64 ABI Draft 0.98, page 76
1522 0xff, 0x25, // jmpq indirect
1523 0, 0, 0, 0, // replaced with address of symbol in .got
1524 0x68, // pushq immediate
1525 0, 0, 0, 0, // replaced with offset into relocation table
1526 0xe9, // jmpq relative
1527 0, 0, 0, 0 // replaced with offset to start of .plt
1532 Output_data_plt_x86_64_standard
<size
>::do_fill_plt_entry(
1534 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
1535 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
1536 unsigned int got_offset
,
1537 unsigned int plt_offset
,
1538 unsigned int plt_index
)
1540 // Check PC-relative offset overflow in PLT entry.
1541 uint64_t plt_got_pcrel_offset
= (got_address
+ got_offset
1542 - (plt_address
+ plt_offset
+ 6));
1543 if (Bits
<32>::has_overflow(plt_got_pcrel_offset
))
1544 gold_error(_("PC-relative offset overflow in PLT entry %d"),
1547 memcpy(pov
, plt_entry
, plt_entry_size
);
1548 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
1549 plt_got_pcrel_offset
);
1551 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 7, plt_index
);
1552 elfcpp::Swap
<32, false>::writeval(pov
+ 12,
1553 - (plt_offset
+ plt_entry_size
));
1558 // The reserved TLSDESC entry in the PLT for an executable.
1562 Output_data_plt_x86_64_standard
<size
>::tlsdesc_plt_entry
[plt_entry_size
] =
1564 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1565 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1566 0xff, 0x35, // pushq x(%rip)
1567 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1568 0xff, 0x25, // jmpq *y(%rip)
1569 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
1576 Output_data_plt_x86_64_standard
<size
>::do_fill_tlsdesc_entry(
1578 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
1579 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
1580 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
,
1581 unsigned int tlsdesc_got_offset
,
1582 unsigned int plt_offset
)
1584 memcpy(pov
, tlsdesc_plt_entry
, plt_entry_size
);
1585 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
1587 - (plt_address
+ plt_offset
1589 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 8,
1591 + tlsdesc_got_offset
1592 - (plt_address
+ plt_offset
1596 // The .eh_frame unwind information for the PLT.
1600 Output_data_plt_x86_64
<size
>::plt_eh_frame_cie
[plt_eh_frame_cie_size
] =
1603 'z', // Augmentation: augmentation size included.
1604 'R', // Augmentation: FDE encoding included.
1605 '\0', // End of augmentation string.
1606 1, // Code alignment factor.
1607 0x78, // Data alignment factor.
1608 16, // Return address column.
1609 1, // Augmentation size.
1610 (elfcpp::DW_EH_PE_pcrel
// FDE encoding.
1611 | elfcpp::DW_EH_PE_sdata4
),
1612 elfcpp::DW_CFA_def_cfa
, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1613 elfcpp::DW_CFA_offset
+ 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1614 elfcpp::DW_CFA_nop
, // Align to 16 bytes.
1620 Output_data_plt_x86_64_standard
<size
>::plt_eh_frame_fde
[plt_eh_frame_fde_size
] =
1622 0, 0, 0, 0, // Replaced with offset to .plt.
1623 0, 0, 0, 0, // Replaced with size of .plt.
1624 0, // Augmentation size.
1625 elfcpp::DW_CFA_def_cfa_offset
, 16, // DW_CFA_def_cfa_offset: 16.
1626 elfcpp::DW_CFA_advance_loc
+ 6, // Advance 6 to __PLT__ + 6.
1627 elfcpp::DW_CFA_def_cfa_offset
, 24, // DW_CFA_def_cfa_offset: 24.
1628 elfcpp::DW_CFA_advance_loc
+ 10, // Advance 10 to __PLT__ + 16.
1629 elfcpp::DW_CFA_def_cfa_expression
, // DW_CFA_def_cfa_expression.
1630 11, // Block length.
1631 elfcpp::DW_OP_breg7
, 8, // Push %rsp + 8.
1632 elfcpp::DW_OP_breg16
, 0, // Push %rip.
1633 elfcpp::DW_OP_lit15
, // Push 0xf.
1634 elfcpp::DW_OP_and
, // & (%rip & 0xf).
1635 elfcpp::DW_OP_lit11
, // Push 0xb.
1636 elfcpp::DW_OP_ge
, // >= ((%rip & 0xf) >= 0xb)
1637 elfcpp::DW_OP_lit3
, // Push 3.
1638 elfcpp::DW_OP_shl
, // << (((%rip & 0xf) >= 0xb) << 3)
1639 elfcpp::DW_OP_plus
, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1640 elfcpp::DW_CFA_nop
, // Align to 32 bytes.
1646 // Write out the PLT. This uses the hand-coded instructions above,
1647 // and adjusts them as needed. This is specified by the AMD64 ABI.
1651 Output_data_plt_x86_64
<size
>::do_write(Output_file
* of
)
1653 const off_t offset
= this->offset();
1654 const section_size_type oview_size
=
1655 convert_to_section_size_type(this->data_size());
1656 unsigned char* const oview
= of
->get_output_view(offset
, oview_size
);
1658 const off_t got_file_offset
= this->got_plt_
->offset();
1659 gold_assert(parameters
->incremental_update()
1660 || (got_file_offset
+ this->got_plt_
->data_size()
1661 == this->got_irelative_
->offset()));
1662 const section_size_type got_size
=
1663 convert_to_section_size_type(this->got_plt_
->data_size()
1664 + this->got_irelative_
->data_size());
1665 unsigned char* const got_view
= of
->get_output_view(got_file_offset
,
1668 unsigned char* pov
= oview
;
1670 // The base address of the .plt section.
1671 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
= this->address();
1672 // The base address of the .got section.
1673 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
= this->got_
->address();
1674 // The base address of the PLT portion of the .got section,
1675 // which is where the GOT pointer will point, and where the
1676 // three reserved GOT entries are located.
1677 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
1678 = this->got_plt_
->address();
1680 this->fill_first_plt_entry(pov
, got_address
, plt_address
);
1681 pov
+= this->get_plt_entry_size();
1683 // The first three entries in the GOT are reserved, and are written
1684 // by Output_data_got_plt_x86_64::do_write.
1685 unsigned char* got_pov
= got_view
+ 24;
1687 unsigned int plt_offset
= this->get_plt_entry_size();
1688 unsigned int got_offset
= 24;
1689 const unsigned int count
= this->count_
+ this->irelative_count_
;
1690 for (unsigned int plt_index
= 0;
1693 pov
+= this->get_plt_entry_size(),
1695 plt_offset
+= this->get_plt_entry_size(),
1698 // Set and adjust the PLT entry itself.
1699 unsigned int lazy_offset
= this->fill_plt_entry(pov
,
1700 got_address
, plt_address
,
1701 got_offset
, plt_offset
,
1704 // Set the entry in the GOT.
1705 elfcpp::Swap
<64, false>::writeval(got_pov
,
1706 plt_address
+ plt_offset
+ lazy_offset
);
1709 if (this->has_tlsdesc_entry())
1711 // Set and adjust the reserved TLSDESC PLT entry.
1712 unsigned int tlsdesc_got_offset
= this->get_tlsdesc_got_offset();
1713 this->fill_tlsdesc_entry(pov
, got_address
, plt_address
, got_base
,
1714 tlsdesc_got_offset
, plt_offset
);
1715 pov
+= this->get_plt_entry_size();
1718 gold_assert(static_cast<section_size_type
>(pov
- oview
) == oview_size
);
1719 gold_assert(static_cast<section_size_type
>(got_pov
- got_view
) == got_size
);
1721 of
->write_output_view(offset
, oview_size
, oview
);
1722 of
->write_output_view(got_file_offset
, got_size
, got_view
);
1725 // Create the PLT section.
1729 Target_x86_64
<size
>::make_plt_section(Symbol_table
* symtab
, Layout
* layout
)
1731 if (this->plt_
== NULL
)
1733 // Create the GOT sections first.
1734 this->got_section(symtab
, layout
);
1736 this->plt_
= this->make_data_plt(layout
, this->got_
, this->got_plt_
,
1737 this->got_irelative_
);
1739 // Add unwind information if requested.
1740 if (parameters
->options().ld_generated_unwind_info())
1741 this->plt_
->add_eh_frame(layout
);
1743 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1745 | elfcpp::SHF_EXECINSTR
),
1746 this->plt_
, ORDER_PLT
, false);
1748 // Make the sh_info field of .rela.plt point to .plt.
1749 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
1750 rela_plt_os
->set_info_section(this->plt_
->output_section());
1754 // Return the section for TLSDESC relocations.
1757 typename Target_x86_64
<size
>::Reloc_section
*
1758 Target_x86_64
<size
>::rela_tlsdesc_section(Layout
* layout
) const
1760 return this->plt_section()->rela_tlsdesc(layout
);
1763 // Create a PLT entry for a global symbol.
1767 Target_x86_64
<size
>::make_plt_entry(Symbol_table
* symtab
, Layout
* layout
,
1770 if (gsym
->has_plt_offset())
1773 if (this->plt_
== NULL
)
1774 this->make_plt_section(symtab
, layout
);
1776 this->plt_
->add_entry(symtab
, layout
, gsym
);
1779 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1783 Target_x86_64
<size
>::make_local_ifunc_plt_entry(
1784 Symbol_table
* symtab
, Layout
* layout
,
1785 Sized_relobj_file
<size
, false>* relobj
,
1786 unsigned int local_sym_index
)
1788 if (relobj
->local_has_plt_offset(local_sym_index
))
1790 if (this->plt_
== NULL
)
1791 this->make_plt_section(symtab
, layout
);
1792 unsigned int plt_offset
= this->plt_
->add_local_ifunc_entry(symtab
, layout
,
1795 relobj
->set_local_plt_offset(local_sym_index
, plt_offset
);
1798 // Return the number of entries in the PLT.
1802 Target_x86_64
<size
>::plt_entry_count() const
1804 if (this->plt_
== NULL
)
1806 return this->plt_
->entry_count();
1809 // Return the offset of the first non-reserved PLT entry.
1813 Target_x86_64
<size
>::first_plt_entry_offset() const
1815 return this->plt_
->first_plt_entry_offset();
1818 // Return the size of each PLT entry.
1822 Target_x86_64
<size
>::plt_entry_size() const
1824 return this->plt_
->get_plt_entry_size();
1827 // Create the GOT and PLT sections for an incremental update.
1830 Output_data_got_base
*
1831 Target_x86_64
<size
>::init_got_plt_for_update(Symbol_table
* symtab
,
1833 unsigned int got_count
,
1834 unsigned int plt_count
)
1836 gold_assert(this->got_
== NULL
);
1838 this->got_
= new Output_data_got
<64, false>(got_count
* 8);
1839 layout
->add_output_section_data(".got", elfcpp::SHT_PROGBITS
,
1841 | elfcpp::SHF_WRITE
),
1842 this->got_
, ORDER_RELRO_LAST
,
1845 // Add the three reserved entries.
1846 this->got_plt_
= new Output_data_got_plt_x86_64(layout
, (plt_count
+ 3) * 8);
1847 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
1849 | elfcpp::SHF_WRITE
),
1850 this->got_plt_
, ORDER_NON_RELRO_FIRST
,
1853 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1854 this->global_offset_table_
=
1855 symtab
->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL
,
1856 Symbol_table::PREDEFINED
,
1858 0, 0, elfcpp::STT_OBJECT
,
1860 elfcpp::STV_HIDDEN
, 0,
1863 // If there are any TLSDESC relocations, they get GOT entries in
1864 // .got.plt after the jump slot entries.
1865 // FIXME: Get the count for TLSDESC entries.
1866 this->got_tlsdesc_
= new Output_data_got
<64, false>(0);
1867 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
1868 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
1870 ORDER_NON_RELRO_FIRST
, false);
1872 // If there are any IRELATIVE relocations, they get GOT entries in
1873 // .got.plt after the jump slot and TLSDESC entries.
1874 this->got_irelative_
= new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1875 layout
->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS
,
1876 elfcpp::SHF_ALLOC
| elfcpp::SHF_WRITE
,
1877 this->got_irelative_
,
1878 ORDER_NON_RELRO_FIRST
, false);
1880 // Create the PLT section.
1881 this->plt_
= this->make_data_plt(layout
, this->got_
,
1883 this->got_irelative_
,
1886 // Add unwind information if requested.
1887 if (parameters
->options().ld_generated_unwind_info())
1888 this->plt_
->add_eh_frame(layout
);
1890 layout
->add_output_section_data(".plt", elfcpp::SHT_PROGBITS
,
1891 elfcpp::SHF_ALLOC
| elfcpp::SHF_EXECINSTR
,
1892 this->plt_
, ORDER_PLT
, false);
1894 // Make the sh_info field of .rela.plt point to .plt.
1895 Output_section
* rela_plt_os
= this->plt_
->rela_plt()->output_section();
1896 rela_plt_os
->set_info_section(this->plt_
->output_section());
1898 // Create the rela_dyn section.
1899 this->rela_dyn_section(layout
);
1904 // Reserve a GOT entry for a local symbol, and regenerate any
1905 // necessary dynamic relocations.
1909 Target_x86_64
<size
>::reserve_local_got_entry(
1910 unsigned int got_index
,
1911 Sized_relobj
<size
, false>* obj
,
1913 unsigned int got_type
)
1915 unsigned int got_offset
= got_index
* 8;
1916 Reloc_section
* rela_dyn
= this->rela_dyn_section(NULL
);
1918 this->got_
->reserve_local(got_index
, obj
, r_sym
, got_type
);
1921 case GOT_TYPE_STANDARD
:
1922 if (parameters
->options().output_is_position_independent())
1923 rela_dyn
->add_local_relative(obj
, r_sym
, elfcpp::R_X86_64_RELATIVE
,
1924 this->got_
, got_offset
, 0, false);
1926 case GOT_TYPE_TLS_OFFSET
:
1927 rela_dyn
->add_local(obj
, r_sym
, elfcpp::R_X86_64_TPOFF64
,
1928 this->got_
, got_offset
, 0);
1930 case GOT_TYPE_TLS_PAIR
:
1931 this->got_
->reserve_slot(got_index
+ 1);
1932 rela_dyn
->add_local(obj
, r_sym
, elfcpp::R_X86_64_DTPMOD64
,
1933 this->got_
, got_offset
, 0);
1935 case GOT_TYPE_TLS_DESC
:
1936 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
1937 // this->got_->reserve_slot(got_index + 1);
1938 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
1939 // this->got_, got_offset, 0);
1946 // Reserve a GOT entry for a global symbol, and regenerate any
1947 // necessary dynamic relocations.
1951 Target_x86_64
<size
>::reserve_global_got_entry(unsigned int got_index
,
1953 unsigned int got_type
)
1955 unsigned int got_offset
= got_index
* 8;
1956 Reloc_section
* rela_dyn
= this->rela_dyn_section(NULL
);
1958 this->got_
->reserve_global(got_index
, gsym
, got_type
);
1961 case GOT_TYPE_STANDARD
:
1962 if (!gsym
->final_value_is_known())
1964 if (gsym
->is_from_dynobj()
1965 || gsym
->is_undefined()
1966 || gsym
->is_preemptible()
1967 || gsym
->type() == elfcpp::STT_GNU_IFUNC
)
1968 rela_dyn
->add_global(gsym
, elfcpp::R_X86_64_GLOB_DAT
,
1969 this->got_
, got_offset
, 0);
1971 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_RELATIVE
,
1972 this->got_
, got_offset
, 0, false);
1975 case GOT_TYPE_TLS_OFFSET
:
1976 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_TPOFF64
,
1977 this->got_
, got_offset
, 0, false);
1979 case GOT_TYPE_TLS_PAIR
:
1980 this->got_
->reserve_slot(got_index
+ 1);
1981 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_DTPMOD64
,
1982 this->got_
, got_offset
, 0, false);
1983 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_DTPOFF64
,
1984 this->got_
, got_offset
+ 8, 0, false);
1986 case GOT_TYPE_TLS_DESC
:
1987 this->got_
->reserve_slot(got_index
+ 1);
1988 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_TLSDESC
,
1989 this->got_
, got_offset
, 0, false);
1996 // Register an existing PLT entry for a global symbol.
2000 Target_x86_64
<size
>::register_global_plt_entry(Symbol_table
* symtab
,
2002 unsigned int plt_index
,
2005 gold_assert(this->plt_
!= NULL
);
2006 gold_assert(!gsym
->has_plt_offset());
2008 this->plt_
->reserve_slot(plt_index
);
2010 gsym
->set_plt_offset((plt_index
+ 1) * this->plt_entry_size());
2012 unsigned int got_offset
= (plt_index
+ 3) * 8;
2013 this->plt_
->add_relocation(symtab
, layout
, gsym
, got_offset
);
2016 // Force a COPY relocation for a given symbol.
2020 Target_x86_64
<size
>::emit_copy_reloc(
2021 Symbol_table
* symtab
, Symbol
* sym
, Output_section
* os
, off_t offset
)
2023 this->copy_relocs_
.emit_copy_reloc(symtab
,
2024 symtab
->get_sized_symbol
<size
>(sym
),
2027 this->rela_dyn_section(NULL
));
2030 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
2034 Target_x86_64
<size
>::define_tls_base_symbol(Symbol_table
* symtab
,
2037 if (this->tls_base_symbol_defined_
)
2040 Output_segment
* tls_segment
= layout
->tls_segment();
2041 if (tls_segment
!= NULL
)
2043 bool is_exec
= parameters
->options().output_is_executable();
2044 symtab
->define_in_output_segment("_TLS_MODULE_BASE_", NULL
,
2045 Symbol_table::PREDEFINED
,
2049 elfcpp::STV_HIDDEN
, 0,
2051 ? Symbol::SEGMENT_END
2052 : Symbol::SEGMENT_START
),
2055 this->tls_base_symbol_defined_
= true;
2058 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
2062 Target_x86_64
<size
>::reserve_tlsdesc_entries(Symbol_table
* symtab
,
2065 if (this->plt_
== NULL
)
2066 this->make_plt_section(symtab
, layout
);
2068 if (!this->plt_
->has_tlsdesc_entry())
2070 // Allocate the TLSDESC_GOT entry.
2071 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
2072 unsigned int got_offset
= got
->add_constant(0);
2074 // Allocate the TLSDESC_PLT entry.
2075 this->plt_
->reserve_tlsdesc_entry(got_offset
);
2079 // Create a GOT entry for the TLS module index.
2083 Target_x86_64
<size
>::got_mod_index_entry(Symbol_table
* symtab
, Layout
* layout
,
2084 Sized_relobj_file
<size
, false>* object
)
2086 if (this->got_mod_index_offset_
== -1U)
2088 gold_assert(symtab
!= NULL
&& layout
!= NULL
&& object
!= NULL
);
2089 Reloc_section
* rela_dyn
= this->rela_dyn_section(layout
);
2090 Output_data_got
<64, false>* got
= this->got_section(symtab
, layout
);
2091 unsigned int got_offset
= got
->add_constant(0);
2092 rela_dyn
->add_local(object
, 0, elfcpp::R_X86_64_DTPMOD64
, got
,
2094 got
->add_constant(0);
2095 this->got_mod_index_offset_
= got_offset
;
2097 return this->got_mod_index_offset_
;
2100 // Optimize the TLS relocation type based on what we know about the
2101 // symbol. IS_FINAL is true if the final address of this symbol is
2102 // known at link time.
2105 tls::Tls_optimization
2106 Target_x86_64
<size
>::optimize_tls_reloc(bool is_final
, int r_type
)
2108 // If we are generating a shared library, then we can't do anything
2110 if (parameters
->options().shared())
2111 return tls::TLSOPT_NONE
;
2115 case elfcpp::R_X86_64_TLSGD
:
2116 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
2117 case elfcpp::R_X86_64_TLSDESC_CALL
:
2118 // These are General-Dynamic which permits fully general TLS
2119 // access. Since we know that we are generating an executable,
2120 // we can convert this to Initial-Exec. If we also know that
2121 // this is a local symbol, we can further switch to Local-Exec.
2123 return tls::TLSOPT_TO_LE
;
2124 return tls::TLSOPT_TO_IE
;
2126 case elfcpp::R_X86_64_TLSLD
:
2127 // This is Local-Dynamic, which refers to a local symbol in the
2128 // dynamic TLS block. Since we know that we generating an
2129 // executable, we can switch to Local-Exec.
2130 return tls::TLSOPT_TO_LE
;
2132 case elfcpp::R_X86_64_DTPOFF32
:
2133 case elfcpp::R_X86_64_DTPOFF64
:
2134 // Another Local-Dynamic reloc.
2135 return tls::TLSOPT_TO_LE
;
2137 case elfcpp::R_X86_64_GOTTPOFF
:
2138 // These are Initial-Exec relocs which get the thread offset
2139 // from the GOT. If we know that we are linking against the
2140 // local symbol, we can switch to Local-Exec, which links the
2141 // thread offset into the instruction.
2143 return tls::TLSOPT_TO_LE
;
2144 return tls::TLSOPT_NONE
;
2146 case elfcpp::R_X86_64_TPOFF32
:
2147 // When we already have Local-Exec, there is nothing further we
2149 return tls::TLSOPT_NONE
;
2156 // Get the Reference_flags for a particular relocation.
2160 Target_x86_64
<size
>::Scan::get_reference_flags(unsigned int r_type
)
2164 case elfcpp::R_X86_64_NONE
:
2165 case elfcpp::R_X86_64_GNU_VTINHERIT
:
2166 case elfcpp::R_X86_64_GNU_VTENTRY
:
2167 case elfcpp::R_X86_64_GOTPC32
:
2168 case elfcpp::R_X86_64_GOTPC64
:
2169 // No symbol reference.
2172 case elfcpp::R_X86_64_64
:
2173 case elfcpp::R_X86_64_32
:
2174 case elfcpp::R_X86_64_32S
:
2175 case elfcpp::R_X86_64_16
:
2176 case elfcpp::R_X86_64_8
:
2177 return Symbol::ABSOLUTE_REF
;
2179 case elfcpp::R_X86_64_PC64
:
2180 case elfcpp::R_X86_64_PC32
:
2181 case elfcpp::R_X86_64_PC32_BND
:
2182 case elfcpp::R_X86_64_PC16
:
2183 case elfcpp::R_X86_64_PC8
:
2184 case elfcpp::R_X86_64_GOTOFF64
:
2185 return Symbol::RELATIVE_REF
;
2187 case elfcpp::R_X86_64_PLT32
:
2188 case elfcpp::R_X86_64_PLT32_BND
:
2189 case elfcpp::R_X86_64_PLTOFF64
:
2190 return Symbol::FUNCTION_CALL
| Symbol::RELATIVE_REF
;
2192 case elfcpp::R_X86_64_GOT64
:
2193 case elfcpp::R_X86_64_GOT32
:
2194 case elfcpp::R_X86_64_GOTPCREL64
:
2195 case elfcpp::R_X86_64_GOTPCREL
:
2196 case elfcpp::R_X86_64_GOTPCRELX
:
2197 case elfcpp::R_X86_64_REX_GOTPCRELX
:
2198 case elfcpp::R_X86_64_GOTPLT64
:
2200 return Symbol::ABSOLUTE_REF
;
2202 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
2203 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2204 case elfcpp::R_X86_64_TLSDESC_CALL
:
2205 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2206 case elfcpp::R_X86_64_DTPOFF32
:
2207 case elfcpp::R_X86_64_DTPOFF64
:
2208 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2209 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2210 return Symbol::TLS_REF
;
2212 case elfcpp::R_X86_64_COPY
:
2213 case elfcpp::R_X86_64_GLOB_DAT
:
2214 case elfcpp::R_X86_64_JUMP_SLOT
:
2215 case elfcpp::R_X86_64_RELATIVE
:
2216 case elfcpp::R_X86_64_IRELATIVE
:
2217 case elfcpp::R_X86_64_TPOFF64
:
2218 case elfcpp::R_X86_64_DTPMOD64
:
2219 case elfcpp::R_X86_64_TLSDESC
:
2220 case elfcpp::R_X86_64_SIZE32
:
2221 case elfcpp::R_X86_64_SIZE64
:
2223 // Not expected. We will give an error later.
2228 // Report an unsupported relocation against a local symbol.
2232 Target_x86_64
<size
>::Scan::unsupported_reloc_local(
2233 Sized_relobj_file
<size
, false>* object
,
2234 unsigned int r_type
)
2236 gold_error(_("%s: unsupported reloc %u against local symbol"),
2237 object
->name().c_str(), r_type
);
2240 // We are about to emit a dynamic relocation of type R_TYPE. If the
2241 // dynamic linker does not support it, issue an error. The GNU linker
2242 // only issues a non-PIC error for an allocated read-only section.
2243 // Here we know the section is allocated, but we don't know that it is
2244 // read-only. But we check for all the relocation types which the
2245 // glibc dynamic linker supports, so it seems appropriate to issue an
2246 // error even if the section is not read-only. If GSYM is not NULL,
2247 // it is the symbol the relocation is against; if it is NULL, the
2248 // relocation is against a local symbol.
2252 Target_x86_64
<size
>::Scan::check_non_pic(Relobj
* object
, unsigned int r_type
,
2257 // These are the relocation types supported by glibc for x86_64
2258 // which should always work.
2259 case elfcpp::R_X86_64_RELATIVE
:
2260 case elfcpp::R_X86_64_IRELATIVE
:
2261 case elfcpp::R_X86_64_GLOB_DAT
:
2262 case elfcpp::R_X86_64_JUMP_SLOT
:
2263 case elfcpp::R_X86_64_DTPMOD64
:
2264 case elfcpp::R_X86_64_DTPOFF64
:
2265 case elfcpp::R_X86_64_TPOFF64
:
2266 case elfcpp::R_X86_64_64
:
2267 case elfcpp::R_X86_64_COPY
:
2270 // glibc supports these reloc types, but they can overflow.
2271 case elfcpp::R_X86_64_PC32
:
2272 case elfcpp::R_X86_64_PC32_BND
:
2273 // A PC relative reference is OK against a local symbol or if
2274 // the symbol is defined locally.
2276 || (!gsym
->is_from_dynobj()
2277 && !gsym
->is_undefined()
2278 && !gsym
->is_preemptible()))
2281 case elfcpp::R_X86_64_32
:
2282 // R_X86_64_32 is OK for x32.
2283 if (size
== 32 && r_type
== elfcpp::R_X86_64_32
)
2285 if (this->issued_non_pic_error_
)
2287 gold_assert(parameters
->options().output_is_position_independent());
2289 object
->error(_("requires dynamic R_X86_64_32 reloc which may "
2290 "overflow at runtime; recompile with -fPIC"));
2296 case elfcpp::R_X86_64_32
:
2297 r_name
= "R_X86_64_32";
2299 case elfcpp::R_X86_64_PC32
:
2300 r_name
= "R_X86_64_PC32";
2302 case elfcpp::R_X86_64_PC32_BND
:
2303 r_name
= "R_X86_64_PC32_BND";
2309 object
->error(_("requires dynamic %s reloc against '%s' "
2310 "which may overflow at runtime; recompile "
2312 r_name
, gsym
->name());
2314 this->issued_non_pic_error_
= true;
2318 // This prevents us from issuing more than one error per reloc
2319 // section. But we can still wind up issuing more than one
2320 // error per object file.
2321 if (this->issued_non_pic_error_
)
2323 gold_assert(parameters
->options().output_is_position_independent());
2324 object
->error(_("requires unsupported dynamic reloc %u; "
2325 "recompile with -fPIC"),
2327 this->issued_non_pic_error_
= true;
2330 case elfcpp::R_X86_64_NONE
:
2335 // Return whether we need to make a PLT entry for a relocation of the
2336 // given type against a STT_GNU_IFUNC symbol.
2340 Target_x86_64
<size
>::Scan::reloc_needs_plt_for_ifunc(
2341 Sized_relobj_file
<size
, false>* object
,
2342 unsigned int r_type
)
2344 int flags
= Scan::get_reference_flags(r_type
);
2345 if (flags
& Symbol::TLS_REF
)
2346 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2347 object
->name().c_str(), r_type
);
2351 // Scan a relocation for a local symbol.
2355 Target_x86_64
<size
>::Scan::local(Symbol_table
* symtab
,
2357 Target_x86_64
<size
>* target
,
2358 Sized_relobj_file
<size
, false>* object
,
2359 unsigned int data_shndx
,
2360 Output_section
* output_section
,
2361 const elfcpp::Rela
<size
, false>& reloc
,
2362 unsigned int r_type
,
2363 const elfcpp::Sym
<size
, false>& lsym
,
2369 // A local STT_GNU_IFUNC symbol may require a PLT entry.
2370 bool is_ifunc
= lsym
.get_st_type() == elfcpp::STT_GNU_IFUNC
;
2371 if (is_ifunc
&& this->reloc_needs_plt_for_ifunc(object
, r_type
))
2373 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2374 target
->make_local_ifunc_plt_entry(symtab
, layout
, object
, r_sym
);
2379 case elfcpp::R_X86_64_NONE
:
2380 case elfcpp::R_X86_64_GNU_VTINHERIT
:
2381 case elfcpp::R_X86_64_GNU_VTENTRY
:
2384 case elfcpp::R_X86_64_64
:
2385 // If building a shared library (or a position-independent
2386 // executable), we need to create a dynamic relocation for this
2387 // location. The relocation applied at link time will apply the
2388 // link-time value, so we flag the location with an
2389 // R_X86_64_RELATIVE relocation so the dynamic loader can
2390 // relocate it easily.
2391 if (parameters
->options().output_is_position_independent())
2393 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2394 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2395 rela_dyn
->add_local_relative(object
, r_sym
,
2397 ? elfcpp::R_X86_64_RELATIVE64
2398 : elfcpp::R_X86_64_RELATIVE
),
2399 output_section
, data_shndx
,
2400 reloc
.get_r_offset(),
2401 reloc
.get_r_addend(), is_ifunc
);
2405 case elfcpp::R_X86_64_32
:
2406 case elfcpp::R_X86_64_32S
:
2407 case elfcpp::R_X86_64_16
:
2408 case elfcpp::R_X86_64_8
:
2409 // If building a shared library (or a position-independent
2410 // executable), we need to create a dynamic relocation for this
2411 // location. We can't use an R_X86_64_RELATIVE relocation
2412 // because that is always a 64-bit relocation.
2413 if (parameters
->options().output_is_position_independent())
2415 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2416 if (size
== 32 && r_type
== elfcpp::R_X86_64_32
)
2418 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2419 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2420 rela_dyn
->add_local_relative(object
, r_sym
,
2421 elfcpp::R_X86_64_RELATIVE
,
2422 output_section
, data_shndx
,
2423 reloc
.get_r_offset(),
2424 reloc
.get_r_addend(), is_ifunc
);
2428 this->check_non_pic(object
, r_type
, NULL
);
2430 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2431 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2432 if (lsym
.get_st_type() != elfcpp::STT_SECTION
)
2433 rela_dyn
->add_local(object
, r_sym
, r_type
, output_section
,
2434 data_shndx
, reloc
.get_r_offset(),
2435 reloc
.get_r_addend());
2438 gold_assert(lsym
.get_st_value() == 0);
2439 unsigned int shndx
= lsym
.get_st_shndx();
2441 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
,
2444 object
->error(_("section symbol %u has bad shndx %u"),
2447 rela_dyn
->add_local_section(object
, shndx
,
2448 r_type
, output_section
,
2449 data_shndx
, reloc
.get_r_offset(),
2450 reloc
.get_r_addend());
2455 case elfcpp::R_X86_64_PC64
:
2456 case elfcpp::R_X86_64_PC32
:
2457 case elfcpp::R_X86_64_PC32_BND
:
2458 case elfcpp::R_X86_64_PC16
:
2459 case elfcpp::R_X86_64_PC8
:
2462 case elfcpp::R_X86_64_PLT32
:
2463 case elfcpp::R_X86_64_PLT32_BND
:
2464 // Since we know this is a local symbol, we can handle this as a
2468 case elfcpp::R_X86_64_GOTPC32
:
2469 case elfcpp::R_X86_64_GOTOFF64
:
2470 case elfcpp::R_X86_64_GOTPC64
:
2471 case elfcpp::R_X86_64_PLTOFF64
:
2472 // We need a GOT section.
2473 target
->got_section(symtab
, layout
);
2474 // For PLTOFF64, we'd normally want a PLT section, but since we
2475 // know this is a local symbol, no PLT is needed.
2478 case elfcpp::R_X86_64_GOT64
:
2479 case elfcpp::R_X86_64_GOT32
:
2480 case elfcpp::R_X86_64_GOTPCREL64
:
2481 case elfcpp::R_X86_64_GOTPCREL
:
2482 case elfcpp::R_X86_64_GOTPCRELX
:
2483 case elfcpp::R_X86_64_REX_GOTPCRELX
:
2484 case elfcpp::R_X86_64_GOTPLT64
:
2486 // The symbol requires a GOT section.
2487 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
2489 // If the relocation symbol isn't IFUNC,
2490 // and is local, then we will convert
2491 // mov foo@GOTPCREL(%rip), %reg
2492 // to lea foo(%rip), %reg.
2493 // in Relocate::relocate.
2494 if ((r_type
== elfcpp::R_X86_64_GOTPCREL
2495 || r_type
== elfcpp::R_X86_64_GOTPCRELX
2496 || r_type
== elfcpp::R_X86_64_REX_GOTPCRELX
)
2497 && reloc
.get_r_offset() >= 2
2500 section_size_type stype
;
2501 const unsigned char* view
= object
->section_contents(data_shndx
,
2503 if (view
[reloc
.get_r_offset() - 2] == 0x8b)
2508 // The symbol requires a GOT entry.
2509 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2511 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
2512 // lets function pointers compare correctly with shared
2513 // libraries. Otherwise we would need an IRELATIVE reloc.
2516 is_new
= got
->add_local_plt(object
, r_sym
, GOT_TYPE_STANDARD
);
2518 is_new
= got
->add_local(object
, r_sym
, GOT_TYPE_STANDARD
);
2521 // If we are generating a shared object, we need to add a
2522 // dynamic relocation for this symbol's GOT entry.
2523 if (parameters
->options().output_is_position_independent())
2525 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2526 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2527 if (r_type
!= elfcpp::R_X86_64_GOT32
)
2529 unsigned int got_offset
=
2530 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
);
2531 rela_dyn
->add_local_relative(object
, r_sym
,
2532 elfcpp::R_X86_64_RELATIVE
,
2533 got
, got_offset
, 0, is_ifunc
);
2537 this->check_non_pic(object
, r_type
, NULL
);
2539 gold_assert(lsym
.get_st_type() != elfcpp::STT_SECTION
);
2540 rela_dyn
->add_local(
2541 object
, r_sym
, r_type
, got
,
2542 object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
), 0);
2546 // For GOTPLT64, we'd normally want a PLT section, but since
2547 // we know this is a local symbol, no PLT is needed.
2551 case elfcpp::R_X86_64_COPY
:
2552 case elfcpp::R_X86_64_GLOB_DAT
:
2553 case elfcpp::R_X86_64_JUMP_SLOT
:
2554 case elfcpp::R_X86_64_RELATIVE
:
2555 case elfcpp::R_X86_64_IRELATIVE
:
2556 // These are outstanding tls relocs, which are unexpected when linking
2557 case elfcpp::R_X86_64_TPOFF64
:
2558 case elfcpp::R_X86_64_DTPMOD64
:
2559 case elfcpp::R_X86_64_TLSDESC
:
2560 gold_error(_("%s: unexpected reloc %u in object file"),
2561 object
->name().c_str(), r_type
);
2564 // These are initial tls relocs, which are expected when linking
2565 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
2566 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
2567 case elfcpp::R_X86_64_TLSDESC_CALL
:
2568 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2569 case elfcpp::R_X86_64_DTPOFF32
:
2570 case elfcpp::R_X86_64_DTPOFF64
:
2571 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2572 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2574 bool output_is_shared
= parameters
->options().shared();
2575 const tls::Tls_optimization optimized_type
2576 = Target_x86_64
<size
>::optimize_tls_reloc(!output_is_shared
,
2580 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
2581 if (optimized_type
== tls::TLSOPT_NONE
)
2583 // Create a pair of GOT entries for the module index and
2584 // dtv-relative offset.
2585 Output_data_got
<64, false>* got
2586 = target
->got_section(symtab
, layout
);
2587 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2588 unsigned int shndx
= lsym
.get_st_shndx();
2590 shndx
= object
->adjust_sym_shndx(r_sym
, shndx
, &is_ordinary
);
2592 object
->error(_("local symbol %u has bad shndx %u"),
2595 got
->add_local_pair_with_rel(object
, r_sym
,
2598 target
->rela_dyn_section(layout
),
2599 elfcpp::R_X86_64_DTPMOD64
);
2601 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2602 unsupported_reloc_local(object
, r_type
);
2605 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
2606 target
->define_tls_base_symbol(symtab
, layout
);
2607 if (optimized_type
== tls::TLSOPT_NONE
)
2609 // Create reserved PLT and GOT entries for the resolver.
2610 target
->reserve_tlsdesc_entries(symtab
, layout
);
2612 // Generate a double GOT entry with an
2613 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
2614 // is resolved lazily, so the GOT entry needs to be in
2615 // an area in .got.plt, not .got. Call got_section to
2616 // make sure the section has been created.
2617 target
->got_section(symtab
, layout
);
2618 Output_data_got
<64, false>* got
= target
->got_tlsdesc_section();
2619 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2620 if (!object
->local_has_got_offset(r_sym
, GOT_TYPE_TLS_DESC
))
2622 unsigned int got_offset
= got
->add_constant(0);
2623 got
->add_constant(0);
2624 object
->set_local_got_offset(r_sym
, GOT_TYPE_TLS_DESC
,
2626 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
2627 // We store the arguments we need in a vector, and
2628 // use the index into the vector as the parameter
2629 // to pass to the target specific routines.
2630 uintptr_t intarg
= target
->add_tlsdesc_info(object
, r_sym
);
2631 void* arg
= reinterpret_cast<void*>(intarg
);
2632 rt
->add_target_specific(elfcpp::R_X86_64_TLSDESC
, arg
,
2633 got
, got_offset
, 0);
2636 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2637 unsupported_reloc_local(object
, r_type
);
2640 case elfcpp::R_X86_64_TLSDESC_CALL
:
2643 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
2644 if (optimized_type
== tls::TLSOPT_NONE
)
2646 // Create a GOT entry for the module index.
2647 target
->got_mod_index_entry(symtab
, layout
, object
);
2649 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2650 unsupported_reloc_local(object
, r_type
);
2653 case elfcpp::R_X86_64_DTPOFF32
:
2654 case elfcpp::R_X86_64_DTPOFF64
:
2657 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
2658 layout
->set_has_static_tls();
2659 if (optimized_type
== tls::TLSOPT_NONE
)
2661 // Create a GOT entry for the tp-relative offset.
2662 Output_data_got
<64, false>* got
2663 = target
->got_section(symtab
, layout
);
2664 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(reloc
.get_r_info());
2665 got
->add_local_with_rel(object
, r_sym
, GOT_TYPE_TLS_OFFSET
,
2666 target
->rela_dyn_section(layout
),
2667 elfcpp::R_X86_64_TPOFF64
);
2669 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
2670 unsupported_reloc_local(object
, r_type
);
2673 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
2674 layout
->set_has_static_tls();
2675 if (output_is_shared
)
2676 unsupported_reloc_local(object
, r_type
);
2685 case elfcpp::R_X86_64_SIZE32
:
2686 case elfcpp::R_X86_64_SIZE64
:
2688 gold_error(_("%s: unsupported reloc %u against local symbol"),
2689 object
->name().c_str(), r_type
);
2695 // Report an unsupported relocation against a global symbol.
2699 Target_x86_64
<size
>::Scan::unsupported_reloc_global(
2700 Sized_relobj_file
<size
, false>* object
,
2701 unsigned int r_type
,
2704 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
2705 object
->name().c_str(), r_type
, gsym
->demangled_name().c_str());
2708 // Returns true if this relocation type could be that of a function pointer.
2711 Target_x86_64
<size
>::Scan::possible_function_pointer_reloc(unsigned int r_type
)
2715 case elfcpp::R_X86_64_64
:
2716 case elfcpp::R_X86_64_32
:
2717 case elfcpp::R_X86_64_32S
:
2718 case elfcpp::R_X86_64_16
:
2719 case elfcpp::R_X86_64_8
:
2720 case elfcpp::R_X86_64_GOT64
:
2721 case elfcpp::R_X86_64_GOT32
:
2722 case elfcpp::R_X86_64_GOTPCREL64
:
2723 case elfcpp::R_X86_64_GOTPCREL
:
2724 case elfcpp::R_X86_64_GOTPCRELX
:
2725 case elfcpp::R_X86_64_REX_GOTPCRELX
:
2726 case elfcpp::R_X86_64_GOTPLT64
:
2734 // For safe ICF, scan a relocation for a local symbol to check if it
2735 // corresponds to a function pointer being taken. In that case mark
2736 // the function whose pointer was taken as not foldable.
2740 Target_x86_64
<size
>::Scan::local_reloc_may_be_function_pointer(
2743 Target_x86_64
<size
>* ,
2744 Sized_relobj_file
<size
, false>* ,
2747 const elfcpp::Rela
<size
, false>& ,
2748 unsigned int r_type
,
2749 const elfcpp::Sym
<size
, false>&)
2751 // When building a shared library, do not fold any local symbols as it is
2752 // not possible to distinguish pointer taken versus a call by looking at
2753 // the relocation types.
2754 return (parameters
->options().shared()
2755 || possible_function_pointer_reloc(r_type
));
2758 // For safe ICF, scan a relocation for a global symbol to check if it
2759 // corresponds to a function pointer being taken. In that case mark
2760 // the function whose pointer was taken as not foldable.
2764 Target_x86_64
<size
>::Scan::global_reloc_may_be_function_pointer(
2767 Target_x86_64
<size
>* ,
2768 Sized_relobj_file
<size
, false>* ,
2771 const elfcpp::Rela
<size
, false>& ,
2772 unsigned int r_type
,
2775 // When building a shared library, do not fold symbols whose visibility
2776 // is hidden, internal or protected.
2777 return ((parameters
->options().shared()
2778 && (gsym
->visibility() == elfcpp::STV_INTERNAL
2779 || gsym
->visibility() == elfcpp::STV_PROTECTED
2780 || gsym
->visibility() == elfcpp::STV_HIDDEN
))
2781 || possible_function_pointer_reloc(r_type
));
2784 // Scan a relocation for a global symbol.
2788 Target_x86_64
<size
>::Scan::global(Symbol_table
* symtab
,
2790 Target_x86_64
<size
>* target
,
2791 Sized_relobj_file
<size
, false>* object
,
2792 unsigned int data_shndx
,
2793 Output_section
* output_section
,
2794 const elfcpp::Rela
<size
, false>& reloc
,
2795 unsigned int r_type
,
2798 // A STT_GNU_IFUNC symbol may require a PLT entry.
2799 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
2800 && this->reloc_needs_plt_for_ifunc(object
, r_type
))
2801 target
->make_plt_entry(symtab
, layout
, gsym
);
2805 case elfcpp::R_X86_64_NONE
:
2806 case elfcpp::R_X86_64_GNU_VTINHERIT
:
2807 case elfcpp::R_X86_64_GNU_VTENTRY
:
2810 case elfcpp::R_X86_64_64
:
2811 case elfcpp::R_X86_64_32
:
2812 case elfcpp::R_X86_64_32S
:
2813 case elfcpp::R_X86_64_16
:
2814 case elfcpp::R_X86_64_8
:
2816 // Make a PLT entry if necessary.
2817 if (gsym
->needs_plt_entry())
2819 target
->make_plt_entry(symtab
, layout
, gsym
);
2820 // Since this is not a PC-relative relocation, we may be
2821 // taking the address of a function. In that case we need to
2822 // set the entry in the dynamic symbol table to the address of
2824 if (gsym
->is_from_dynobj() && !parameters
->options().shared())
2825 gsym
->set_needs_dynsym_value();
2827 // Make a dynamic relocation if necessary.
2828 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
2830 if (!parameters
->options().output_is_position_independent()
2831 && gsym
->may_need_copy_reloc())
2833 target
->copy_reloc(symtab
, layout
, object
,
2834 data_shndx
, output_section
, gsym
, reloc
);
2836 else if (((size
== 64 && r_type
== elfcpp::R_X86_64_64
)
2837 || (size
== 32 && r_type
== elfcpp::R_X86_64_32
))
2838 && gsym
->type() == elfcpp::STT_GNU_IFUNC
2839 && gsym
->can_use_relative_reloc(false)
2840 && !gsym
->is_from_dynobj()
2841 && !gsym
->is_undefined()
2842 && !gsym
->is_preemptible())
2844 // Use an IRELATIVE reloc for a locally defined
2845 // STT_GNU_IFUNC symbol. This makes a function
2846 // address in a PIE executable match the address in a
2847 // shared library that it links against.
2848 Reloc_section
* rela_dyn
=
2849 target
->rela_irelative_section(layout
);
2850 unsigned int r_type
= elfcpp::R_X86_64_IRELATIVE
;
2851 rela_dyn
->add_symbolless_global_addend(gsym
, r_type
,
2852 output_section
, object
,
2854 reloc
.get_r_offset(),
2855 reloc
.get_r_addend());
2857 else if (((size
== 64 && r_type
== elfcpp::R_X86_64_64
)
2858 || (size
== 32 && r_type
== elfcpp::R_X86_64_32
))
2859 && gsym
->can_use_relative_reloc(false))
2861 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2862 rela_dyn
->add_global_relative(gsym
, elfcpp::R_X86_64_RELATIVE
,
2863 output_section
, object
,
2865 reloc
.get_r_offset(),
2866 reloc
.get_r_addend(), false);
2870 this->check_non_pic(object
, r_type
, gsym
);
2871 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2872 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
2873 data_shndx
, reloc
.get_r_offset(),
2874 reloc
.get_r_addend());
2880 case elfcpp::R_X86_64_PC64
:
2881 case elfcpp::R_X86_64_PC32
:
2882 case elfcpp::R_X86_64_PC32_BND
:
2883 case elfcpp::R_X86_64_PC16
:
2884 case elfcpp::R_X86_64_PC8
:
2886 // Make a PLT entry if necessary.
2887 if (gsym
->needs_plt_entry())
2888 target
->make_plt_entry(symtab
, layout
, gsym
);
2889 // Make a dynamic relocation if necessary.
2890 if (gsym
->needs_dynamic_reloc(Scan::get_reference_flags(r_type
)))
2892 if (parameters
->options().output_is_executable()
2893 && gsym
->may_need_copy_reloc())
2895 target
->copy_reloc(symtab
, layout
, object
,
2896 data_shndx
, output_section
, gsym
, reloc
);
2900 this->check_non_pic(object
, r_type
, gsym
);
2901 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2902 rela_dyn
->add_global(gsym
, r_type
, output_section
, object
,
2903 data_shndx
, reloc
.get_r_offset(),
2904 reloc
.get_r_addend());
2910 case elfcpp::R_X86_64_GOT64
:
2911 case elfcpp::R_X86_64_GOT32
:
2912 case elfcpp::R_X86_64_GOTPCREL64
:
2913 case elfcpp::R_X86_64_GOTPCREL
:
2914 case elfcpp::R_X86_64_GOTPCRELX
:
2915 case elfcpp::R_X86_64_REX_GOTPCRELX
:
2916 case elfcpp::R_X86_64_GOTPLT64
:
2918 // The symbol requires a GOT entry.
2919 Output_data_got
<64, false>* got
= target
->got_section(symtab
, layout
);
2921 // If we convert this from
2922 // mov foo@GOTPCREL(%rip), %reg
2923 // to lea foo(%rip), %reg.
2924 // in Relocate::relocate, then there is nothing to do here.
2925 if ((r_type
== elfcpp::R_X86_64_GOTPCREL
2926 || r_type
== elfcpp::R_X86_64_GOTPCRELX
2927 || r_type
== elfcpp::R_X86_64_REX_GOTPCRELX
)
2928 && reloc
.get_r_offset() >= 2
2929 && Target_x86_64
<size
>::can_convert_mov_to_lea(gsym
))
2931 section_size_type stype
;
2932 const unsigned char* view
= object
->section_contents(data_shndx
,
2934 if (view
[reloc
.get_r_offset() - 2] == 0x8b)
2938 if (gsym
->final_value_is_known())
2940 // For a STT_GNU_IFUNC symbol we want the PLT address.
2941 if (gsym
->type() == elfcpp::STT_GNU_IFUNC
)
2942 got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
2944 got
->add_global(gsym
, GOT_TYPE_STANDARD
);
2948 // If this symbol is not fully resolved, we need to add a
2949 // dynamic relocation for it.
2950 Reloc_section
* rela_dyn
= target
->rela_dyn_section(layout
);
2952 // Use a GLOB_DAT rather than a RELATIVE reloc if:
2954 // 1) The symbol may be defined in some other module.
2956 // 2) We are building a shared library and this is a
2957 // protected symbol; using GLOB_DAT means that the dynamic
2958 // linker can use the address of the PLT in the main
2959 // executable when appropriate so that function address
2960 // comparisons work.
2962 // 3) This is a STT_GNU_IFUNC symbol in position dependent
2963 // code, again so that function address comparisons work.
2964 if (gsym
->is_from_dynobj()
2965 || gsym
->is_undefined()
2966 || gsym
->is_preemptible()
2967 || (gsym
->visibility() == elfcpp::STV_PROTECTED
2968 && parameters
->options().shared())
2969 || (gsym
->type() == elfcpp::STT_GNU_IFUNC
2970 && parameters
->options().output_is_position_independent()))
2971 got
->add_global_with_rel(gsym
, GOT_TYPE_STANDARD
, rela_dyn
,
2972 elfcpp::R_X86_64_GLOB_DAT
);
2975 // For a STT_GNU_IFUNC symbol we want to write the PLT
2976 // offset into the GOT, so that function pointer
2977 // comparisons work correctly.
2979 if (gsym
->type() != elfcpp::STT_GNU_IFUNC
)
2980 is_new
= got
->add_global(gsym
, GOT_TYPE_STANDARD
);
2983 is_new
= got
->add_global_plt(gsym
, GOT_TYPE_STANDARD
);
2984 // Tell the dynamic linker to use the PLT address
2985 // when resolving relocations.
2986 if (gsym
->is_from_dynobj()
2987 && !parameters
->options().shared())
2988 gsym
->set_needs_dynsym_value();
2992 unsigned int got_off
= gsym
->got_offset(GOT_TYPE_STANDARD
);
2993 rela_dyn
->add_global_relative(gsym
,
2994 elfcpp::R_X86_64_RELATIVE
,
2995 got
, got_off
, 0, false);
3002 case elfcpp::R_X86_64_PLT32
:
3003 case elfcpp::R_X86_64_PLT32_BND
:
3004 // If the symbol is fully resolved, this is just a PC32 reloc.
3005 // Otherwise we need a PLT entry.
3006 if (gsym
->final_value_is_known())
3008 // If building a shared library, we can also skip the PLT entry
3009 // if the symbol is defined in the output file and is protected
3011 if (gsym
->is_defined()
3012 && !gsym
->is_from_dynobj()
3013 && !gsym
->is_preemptible())
3015 target
->make_plt_entry(symtab
, layout
, gsym
);
3018 case elfcpp::R_X86_64_GOTPC32
:
3019 case elfcpp::R_X86_64_GOTOFF64
:
3020 case elfcpp::R_X86_64_GOTPC64
:
3021 case elfcpp::R_X86_64_PLTOFF64
:
3022 // We need a GOT section.
3023 target
->got_section(symtab
, layout
);
3024 // For PLTOFF64, we also need a PLT entry (but only if the
3025 // symbol is not fully resolved).
3026 if (r_type
== elfcpp::R_X86_64_PLTOFF64
3027 && !gsym
->final_value_is_known())
3028 target
->make_plt_entry(symtab
, layout
, gsym
);
3031 case elfcpp::R_X86_64_COPY
:
3032 case elfcpp::R_X86_64_GLOB_DAT
:
3033 case elfcpp::R_X86_64_JUMP_SLOT
:
3034 case elfcpp::R_X86_64_RELATIVE
:
3035 case elfcpp::R_X86_64_IRELATIVE
:
3036 // These are outstanding tls relocs, which are unexpected when linking
3037 case elfcpp::R_X86_64_TPOFF64
:
3038 case elfcpp::R_X86_64_DTPMOD64
:
3039 case elfcpp::R_X86_64_TLSDESC
:
3040 gold_error(_("%s: unexpected reloc %u in object file"),
3041 object
->name().c_str(), r_type
);
3044 // These are initial tls relocs, which are expected for global()
3045 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
3046 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
3047 case elfcpp::R_X86_64_TLSDESC_CALL
:
3048 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
3049 case elfcpp::R_X86_64_DTPOFF32
:
3050 case elfcpp::R_X86_64_DTPOFF64
:
3051 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
3052 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
3054 // For the Initial-Exec model, we can treat undef symbols as final
3055 // when building an executable.
3056 const bool is_final
= (gsym
->final_value_is_known() ||
3057 (r_type
== elfcpp::R_X86_64_GOTTPOFF
&&
3058 gsym
->is_undefined() &&
3059 parameters
->options().output_is_executable()));
3060 const tls::Tls_optimization optimized_type
3061 = Target_x86_64
<size
>::optimize_tls_reloc(is_final
, r_type
);
3064 case elfcpp::R_X86_64_TLSGD
: // General-dynamic
3065 if (optimized_type
== tls::TLSOPT_NONE
)
3067 // Create a pair of GOT entries for the module index and
3068 // dtv-relative offset.
3069 Output_data_got
<64, false>* got
3070 = target
->got_section(symtab
, layout
);
3071 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_PAIR
,
3072 target
->rela_dyn_section(layout
),
3073 elfcpp::R_X86_64_DTPMOD64
,
3074 elfcpp::R_X86_64_DTPOFF64
);
3076 else if (optimized_type
== tls::TLSOPT_TO_IE
)
3078 // Create a GOT entry for the tp-relative offset.
3079 Output_data_got
<64, false>* got
3080 = target
->got_section(symtab
, layout
);
3081 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
3082 target
->rela_dyn_section(layout
),
3083 elfcpp::R_X86_64_TPOFF64
);
3085 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
3086 unsupported_reloc_global(object
, r_type
, gsym
);
3089 case elfcpp::R_X86_64_GOTPC32_TLSDESC
:
3090 target
->define_tls_base_symbol(symtab
, layout
);
3091 if (optimized_type
== tls::TLSOPT_NONE
)
3093 // Create reserved PLT and GOT entries for the resolver.
3094 target
->reserve_tlsdesc_entries(symtab
, layout
);
3096 // Create a double GOT entry with an R_X86_64_TLSDESC
3097 // reloc. The R_X86_64_TLSDESC reloc is resolved
3098 // lazily, so the GOT entry needs to be in an area in
3099 // .got.plt, not .got. Call got_section to make sure
3100 // the section has been created.
3101 target
->got_section(symtab
, layout
);
3102 Output_data_got
<64, false>* got
= target
->got_tlsdesc_section();
3103 Reloc_section
* rt
= target
->rela_tlsdesc_section(layout
);
3104 got
->add_global_pair_with_rel(gsym
, GOT_TYPE_TLS_DESC
, rt
,
3105 elfcpp::R_X86_64_TLSDESC
, 0);
3107 else if (optimized_type
== tls::TLSOPT_TO_IE
)
3109 // Create a GOT entry for the tp-relative offset.
3110 Output_data_got
<64, false>* got
3111 = target
->got_section(symtab
, layout
);
3112 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
3113 target
->rela_dyn_section(layout
),
3114 elfcpp::R_X86_64_TPOFF64
);
3116 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
3117 unsupported_reloc_global(object
, r_type
, gsym
);
3120 case elfcpp::R_X86_64_TLSDESC_CALL
:
3123 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
3124 if (optimized_type
== tls::TLSOPT_NONE
)
3126 // Create a GOT entry for the module index.
3127 target
->got_mod_index_entry(symtab
, layout
, object
);
3129 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
3130 unsupported_reloc_global(object
, r_type
, gsym
);
3133 case elfcpp::R_X86_64_DTPOFF32
:
3134 case elfcpp::R_X86_64_DTPOFF64
:
3137 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
3138 layout
->set_has_static_tls();
3139 if (optimized_type
== tls::TLSOPT_NONE
)
3141 // Create a GOT entry for the tp-relative offset.
3142 Output_data_got
<64, false>* got
3143 = target
->got_section(symtab
, layout
);
3144 got
->add_global_with_rel(gsym
, GOT_TYPE_TLS_OFFSET
,
3145 target
->rela_dyn_section(layout
),
3146 elfcpp::R_X86_64_TPOFF64
);
3148 else if (optimized_type
!= tls::TLSOPT_TO_LE
)
3149 unsupported_reloc_global(object
, r_type
, gsym
);
3152 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
3153 layout
->set_has_static_tls();
3154 if (parameters
->options().shared())
3155 unsupported_reloc_global(object
, r_type
, gsym
);
3164 case elfcpp::R_X86_64_SIZE32
:
3165 case elfcpp::R_X86_64_SIZE64
:
3167 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
3168 object
->name().c_str(), r_type
,
3169 gsym
->demangled_name().c_str());
3176 Target_x86_64
<size
>::gc_process_relocs(Symbol_table
* symtab
,
3178 Sized_relobj_file
<size
, false>* object
,
3179 unsigned int data_shndx
,
3180 unsigned int sh_type
,
3181 const unsigned char* prelocs
,
3183 Output_section
* output_section
,
3184 bool needs_special_offset_handling
,
3185 size_t local_symbol_count
,
3186 const unsigned char* plocal_symbols
)
3189 if (sh_type
== elfcpp::SHT_REL
)
3194 gold::gc_process_relocs
<size
, false, Target_x86_64
<size
>, elfcpp::SHT_RELA
,
3195 typename Target_x86_64
<size
>::Scan
,
3196 typename Target_x86_64
<size
>::Relocatable_size_for_reloc
>(
3205 needs_special_offset_handling
,
3210 // Scan relocations for a section.
3214 Target_x86_64
<size
>::scan_relocs(Symbol_table
* symtab
,
3216 Sized_relobj_file
<size
, false>* object
,
3217 unsigned int data_shndx
,
3218 unsigned int sh_type
,
3219 const unsigned char* prelocs
,
3221 Output_section
* output_section
,
3222 bool needs_special_offset_handling
,
3223 size_t local_symbol_count
,
3224 const unsigned char* plocal_symbols
)
3226 if (sh_type
== elfcpp::SHT_REL
)
3228 gold_error(_("%s: unsupported REL reloc section"),
3229 object
->name().c_str());
3233 gold::scan_relocs
<size
, false, Target_x86_64
<size
>, elfcpp::SHT_RELA
,
3234 typename Target_x86_64
<size
>::Scan
>(
3243 needs_special_offset_handling
,
3248 // Finalize the sections.
3252 Target_x86_64
<size
>::do_finalize_sections(
3254 const Input_objects
*,
3255 Symbol_table
* symtab
)
3257 const Reloc_section
* rel_plt
= (this->plt_
== NULL
3259 : this->plt_
->rela_plt());
3260 layout
->add_target_dynamic_tags(false, this->got_plt_
, rel_plt
,
3261 this->rela_dyn_
, true, false);
3263 // Fill in some more dynamic tags.
3264 Output_data_dynamic
* const odyn
= layout
->dynamic_data();
3267 if (this->plt_
!= NULL
3268 && this->plt_
->output_section() != NULL
3269 && this->plt_
->has_tlsdesc_entry())
3271 unsigned int plt_offset
= this->plt_
->get_tlsdesc_plt_offset();
3272 unsigned int got_offset
= this->plt_
->get_tlsdesc_got_offset();
3273 this->got_
->finalize_data_size();
3274 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT
,
3275 this->plt_
, plt_offset
);
3276 odyn
->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT
,
3277 this->got_
, got_offset
);
3281 // Emit any relocs we saved in an attempt to avoid generating COPY
3283 if (this->copy_relocs_
.any_saved_relocs())
3284 this->copy_relocs_
.emit(this->rela_dyn_section(layout
));
3286 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3287 // the .got.plt section.
3288 Symbol
* sym
= this->global_offset_table_
;
3291 uint64_t data_size
= this->got_plt_
->current_data_size();
3292 symtab
->get_sized_symbol
<size
>(sym
)->set_symsize(data_size
);
3295 if (parameters
->doing_static_link()
3296 && (this->plt_
== NULL
|| !this->plt_
->has_irelative_section()))
3298 // If linking statically, make sure that the __rela_iplt symbols
3299 // were defined if necessary, even if we didn't create a PLT.
3300 static const Define_symbol_in_segment syms
[] =
3303 "__rela_iplt_start", // name
3304 elfcpp::PT_LOAD
, // segment_type
3305 elfcpp::PF_W
, // segment_flags_set
3306 elfcpp::PF(0), // segment_flags_clear
3309 elfcpp::STT_NOTYPE
, // type
3310 elfcpp::STB_GLOBAL
, // binding
3311 elfcpp::STV_HIDDEN
, // visibility
3313 Symbol::SEGMENT_START
, // offset_from_base
3317 "__rela_iplt_end", // name
3318 elfcpp::PT_LOAD
, // segment_type
3319 elfcpp::PF_W
, // segment_flags_set
3320 elfcpp::PF(0), // segment_flags_clear
3323 elfcpp::STT_NOTYPE
, // type
3324 elfcpp::STB_GLOBAL
, // binding
3325 elfcpp::STV_HIDDEN
, // visibility
3327 Symbol::SEGMENT_START
, // offset_from_base
3332 symtab
->define_symbols(layout
, 2, syms
,
3333 layout
->script_options()->saw_sections_clause());
3337 // Perform a relocation.
3341 Target_x86_64
<size
>::Relocate::relocate(
3342 const Relocate_info
<size
, false>* relinfo
,
3343 Target_x86_64
<size
>* target
,
3346 const elfcpp::Rela
<size
, false>& rela
,
3347 unsigned int r_type
,
3348 const Sized_symbol
<size
>* gsym
,
3349 const Symbol_value
<size
>* psymval
,
3350 unsigned char* view
,
3351 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
3352 section_size_type view_size
)
3354 if (this->skip_call_tls_get_addr_
)
3356 if ((r_type
!= elfcpp::R_X86_64_PLT32
3357 && r_type
!= elfcpp::R_X86_64_PLT32_BND
3358 && r_type
!= elfcpp::R_X86_64_PC32_BND
3359 && r_type
!= elfcpp::R_X86_64_PC32
)
3361 || strcmp(gsym
->name(), "__tls_get_addr") != 0)
3363 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3364 _("missing expected TLS relocation"));
3368 this->skip_call_tls_get_addr_
= false;
3376 const Sized_relobj_file
<size
, false>* object
= relinfo
->object
;
3378 // Pick the value to use for symbols defined in the PLT.
3379 Symbol_value
<size
> symval
;
3381 && gsym
->use_plt_offset(Scan::get_reference_flags(r_type
)))
3383 symval
.set_output_value(target
->plt_address_for_global(gsym
));
3386 else if (gsym
== NULL
&& psymval
->is_ifunc_symbol())
3388 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3389 if (object
->local_has_plt_offset(r_sym
))
3391 symval
.set_output_value(target
->plt_address_for_local(object
, r_sym
));
3396 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
3398 // Get the GOT offset if needed.
3399 // The GOT pointer points to the end of the GOT section.
3400 // We need to subtract the size of the GOT section to get
3401 // the actual offset to use in the relocation.
3402 bool have_got_offset
= false;
3403 // Since the actual offset is always negative, we use signed int to
3404 // support 64-bit GOT relocations.
3408 case elfcpp::R_X86_64_GOT32
:
3409 case elfcpp::R_X86_64_GOT64
:
3410 case elfcpp::R_X86_64_GOTPLT64
:
3411 case elfcpp::R_X86_64_GOTPCREL64
:
3414 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
3415 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - target
->got_size();
3419 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3420 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
3421 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
3422 - target
->got_size());
3424 have_got_offset
= true;
3433 case elfcpp::R_X86_64_NONE
:
3434 case elfcpp::R_X86_64_GNU_VTINHERIT
:
3435 case elfcpp::R_X86_64_GNU_VTENTRY
:
3438 case elfcpp::R_X86_64_64
:
3439 Relocate_functions
<size
, false>::rela64(view
, object
, psymval
, addend
);
3442 case elfcpp::R_X86_64_PC64
:
3443 Relocate_functions
<size
, false>::pcrela64(view
, object
, psymval
, addend
,
3447 case elfcpp::R_X86_64_32
:
3448 // FIXME: we need to verify that value + addend fits into 32 bits:
3449 // uint64_t x = value + addend;
3450 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
3451 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
3452 Relocate_functions
<size
, false>::rela32(view
, object
, psymval
, addend
);
3455 case elfcpp::R_X86_64_32S
:
3456 // FIXME: we need to verify that value + addend fits into 32 bits:
3457 // int64_t x = value + addend; // note this quantity is signed!
3458 // x == static_cast<int64_t>(static_cast<int32_t>(x))
3459 Relocate_functions
<size
, false>::rela32(view
, object
, psymval
, addend
);
3462 case elfcpp::R_X86_64_PC32
:
3463 case elfcpp::R_X86_64_PC32_BND
:
3464 Relocate_functions
<size
, false>::pcrela32(view
, object
, psymval
, addend
,
3468 case elfcpp::R_X86_64_16
:
3469 Relocate_functions
<size
, false>::rela16(view
, object
, psymval
, addend
);
3472 case elfcpp::R_X86_64_PC16
:
3473 Relocate_functions
<size
, false>::pcrela16(view
, object
, psymval
, addend
,
3477 case elfcpp::R_X86_64_8
:
3478 Relocate_functions
<size
, false>::rela8(view
, object
, psymval
, addend
);
3481 case elfcpp::R_X86_64_PC8
:
3482 Relocate_functions
<size
, false>::pcrela8(view
, object
, psymval
, addend
,
3486 case elfcpp::R_X86_64_PLT32
:
3487 case elfcpp::R_X86_64_PLT32_BND
:
3488 gold_assert(gsym
== NULL
3489 || gsym
->has_plt_offset()
3490 || gsym
->final_value_is_known()
3491 || (gsym
->is_defined()
3492 && !gsym
->is_from_dynobj()
3493 && !gsym
->is_preemptible()));
3494 // Note: while this code looks the same as for R_X86_64_PC32, it
3495 // behaves differently because psymval was set to point to
3496 // the PLT entry, rather than the symbol, in Scan::global().
3497 Relocate_functions
<size
, false>::pcrela32(view
, object
, psymval
, addend
,
3501 case elfcpp::R_X86_64_PLTOFF64
:
3504 gold_assert(gsym
->has_plt_offset()
3505 || gsym
->final_value_is_known());
3506 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
;
3507 // This is the address of GLOBAL_OFFSET_TABLE.
3508 got_address
= target
->got_plt_section()->address();
3509 Relocate_functions
<size
, false>::rela64(view
, object
, psymval
,
3510 addend
- got_address
);
3514 case elfcpp::R_X86_64_GOT32
:
3515 gold_assert(have_got_offset
);
3516 Relocate_functions
<size
, false>::rela32(view
, got_offset
, addend
);
3519 case elfcpp::R_X86_64_GOTPC32
:
3522 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
3523 value
= target
->got_plt_section()->address();
3524 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
, address
);
3528 case elfcpp::R_X86_64_GOT64
:
3529 case elfcpp::R_X86_64_GOTPLT64
:
3530 // R_X86_64_GOTPLT64 is obsolete and treated the the same as
3532 gold_assert(have_got_offset
);
3533 Relocate_functions
<size
, false>::rela64(view
, got_offset
, addend
);
3536 case elfcpp::R_X86_64_GOTPC64
:
3539 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
3540 value
= target
->got_plt_section()->address();
3541 Relocate_functions
<size
, false>::pcrela64(view
, value
, addend
, address
);
3545 case elfcpp::R_X86_64_GOTOFF64
:
3547 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
3548 value
= (psymval
->value(object
, 0)
3549 - target
->got_plt_section()->address());
3550 Relocate_functions
<size
, false>::rela64(view
, value
, addend
);
3554 case elfcpp::R_X86_64_GOTPCREL
:
3555 case elfcpp::R_X86_64_GOTPCRELX
:
3556 case elfcpp::R_X86_64_REX_GOTPCRELX
:
3559 // mov foo@GOTPCREL(%rip), %reg
3560 // to lea foo(%rip), %reg.
3562 if (rela
.get_r_offset() >= 2
3564 && ((gsym
== NULL
&& !psymval
->is_ifunc_symbol())
3566 && Target_x86_64
<size
>::can_convert_mov_to_lea(gsym
))))
3569 Relocate_functions
<size
, false>::pcrela32(view
, object
, psymval
, addend
,
3576 gold_assert(gsym
->has_got_offset(GOT_TYPE_STANDARD
));
3577 got_offset
= gsym
->got_offset(GOT_TYPE_STANDARD
) - target
->got_size();
3581 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3582 gold_assert(object
->local_has_got_offset(r_sym
, GOT_TYPE_STANDARD
));
3583 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_STANDARD
)
3584 - target
->got_size());
3586 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
3587 value
= target
->got_plt_section()->address() + got_offset
;
3588 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
, address
);
3593 case elfcpp::R_X86_64_GOTPCREL64
:
3595 gold_assert(have_got_offset
);
3596 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
;
3597 value
= target
->got_plt_section()->address() + got_offset
;
3598 Relocate_functions
<size
, false>::pcrela64(view
, value
, addend
, address
);
3602 case elfcpp::R_X86_64_COPY
:
3603 case elfcpp::R_X86_64_GLOB_DAT
:
3604 case elfcpp::R_X86_64_JUMP_SLOT
:
3605 case elfcpp::R_X86_64_RELATIVE
:
3606 case elfcpp::R_X86_64_IRELATIVE
:
3607 // These are outstanding tls relocs, which are unexpected when linking
3608 case elfcpp::R_X86_64_TPOFF64
:
3609 case elfcpp::R_X86_64_DTPMOD64
:
3610 case elfcpp::R_X86_64_TLSDESC
:
3611 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3612 _("unexpected reloc %u in object file"),
3616 // These are initial tls relocs, which are expected when linking
3617 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
3618 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
3619 case elfcpp::R_X86_64_TLSDESC_CALL
:
3620 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
3621 case elfcpp::R_X86_64_DTPOFF32
:
3622 case elfcpp::R_X86_64_DTPOFF64
:
3623 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
3624 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
3625 this->relocate_tls(relinfo
, target
, relnum
, rela
, r_type
, gsym
, psymval
,
3626 view
, address
, view_size
);
3629 case elfcpp::R_X86_64_SIZE32
:
3630 case elfcpp::R_X86_64_SIZE64
:
3632 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3633 _("unsupported reloc %u"),
3641 // Perform a TLS relocation.
3645 Target_x86_64
<size
>::Relocate::relocate_tls(
3646 const Relocate_info
<size
, false>* relinfo
,
3647 Target_x86_64
<size
>* target
,
3649 const elfcpp::Rela
<size
, false>& rela
,
3650 unsigned int r_type
,
3651 const Sized_symbol
<size
>* gsym
,
3652 const Symbol_value
<size
>* psymval
,
3653 unsigned char* view
,
3654 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
3655 section_size_type view_size
)
3657 Output_segment
* tls_segment
= relinfo
->layout
->tls_segment();
3659 const Sized_relobj_file
<size
, false>* object
= relinfo
->object
;
3660 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
3661 elfcpp::Shdr
<size
, false> data_shdr(relinfo
->data_shdr
);
3662 bool is_executable
= (data_shdr
.get_sh_flags() & elfcpp::SHF_EXECINSTR
) != 0;
3664 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
= psymval
->value(relinfo
->object
, 0);
3666 const bool is_final
= (gsym
== NULL
3667 ? !parameters
->options().shared()
3668 : gsym
->final_value_is_known());
3669 tls::Tls_optimization optimized_type
3670 = Target_x86_64
<size
>::optimize_tls_reloc(is_final
, r_type
);
3673 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
3674 if (!is_executable
&& optimized_type
== tls::TLSOPT_TO_LE
)
3676 // If this code sequence is used in a non-executable section,
3677 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3678 // on the assumption that it's being used by itself in a debug
3679 // section. Therefore, in the unlikely event that the code
3680 // sequence appears in a non-executable section, we simply
3681 // leave it unoptimized.
3682 optimized_type
= tls::TLSOPT_NONE
;
3684 if (optimized_type
== tls::TLSOPT_TO_LE
)
3686 if (tls_segment
== NULL
)
3688 gold_assert(parameters
->errors()->error_count() > 0
3689 || issue_undefined_symbol_error(gsym
));
3692 this->tls_gd_to_le(relinfo
, relnum
, tls_segment
,
3693 rela
, r_type
, value
, view
,
3699 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
3700 ? GOT_TYPE_TLS_OFFSET
3701 : GOT_TYPE_TLS_PAIR
);
3702 unsigned int got_offset
;
3705 gold_assert(gsym
->has_got_offset(got_type
));
3706 got_offset
= gsym
->got_offset(got_type
) - target
->got_size();
3710 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3711 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
3712 got_offset
= (object
->local_got_offset(r_sym
, got_type
)
3713 - target
->got_size());
3715 if (optimized_type
== tls::TLSOPT_TO_IE
)
3717 value
= target
->got_plt_section()->address() + got_offset
;
3718 this->tls_gd_to_ie(relinfo
, relnum
, tls_segment
, rela
, r_type
,
3719 value
, view
, address
, view_size
);
3722 else if (optimized_type
== tls::TLSOPT_NONE
)
3724 // Relocate the field with the offset of the pair of GOT
3726 value
= target
->got_plt_section()->address() + got_offset
;
3727 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
,
3732 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3733 _("unsupported reloc %u"), r_type
);
3736 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
3737 case elfcpp::R_X86_64_TLSDESC_CALL
:
3738 if (!is_executable
&& optimized_type
== tls::TLSOPT_TO_LE
)
3740 // See above comment for R_X86_64_TLSGD.
3741 optimized_type
= tls::TLSOPT_NONE
;
3743 if (optimized_type
== tls::TLSOPT_TO_LE
)
3745 if (tls_segment
== NULL
)
3747 gold_assert(parameters
->errors()->error_count() > 0
3748 || issue_undefined_symbol_error(gsym
));
3751 this->tls_desc_gd_to_le(relinfo
, relnum
, tls_segment
,
3752 rela
, r_type
, value
, view
,
3758 unsigned int got_type
= (optimized_type
== tls::TLSOPT_TO_IE
3759 ? GOT_TYPE_TLS_OFFSET
3760 : GOT_TYPE_TLS_DESC
);
3761 unsigned int got_offset
= 0;
3762 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
3763 && optimized_type
== tls::TLSOPT_NONE
)
3765 // We created GOT entries in the .got.tlsdesc portion of
3766 // the .got.plt section, but the offset stored in the
3767 // symbol is the offset within .got.tlsdesc.
3768 got_offset
= (target
->got_size()
3769 + target
->got_plt_section()->data_size());
3773 gold_assert(gsym
->has_got_offset(got_type
));
3774 got_offset
+= gsym
->got_offset(got_type
) - target
->got_size();
3778 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3779 gold_assert(object
->local_has_got_offset(r_sym
, got_type
));
3780 got_offset
+= (object
->local_got_offset(r_sym
, got_type
)
3781 - target
->got_size());
3783 if (optimized_type
== tls::TLSOPT_TO_IE
)
3785 if (tls_segment
== NULL
)
3787 gold_assert(parameters
->errors()->error_count() > 0
3788 || issue_undefined_symbol_error(gsym
));
3791 value
= target
->got_plt_section()->address() + got_offset
;
3792 this->tls_desc_gd_to_ie(relinfo
, relnum
, tls_segment
,
3793 rela
, r_type
, value
, view
, address
,
3797 else if (optimized_type
== tls::TLSOPT_NONE
)
3799 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
3801 // Relocate the field with the offset of the pair of GOT
3803 value
= target
->got_plt_section()->address() + got_offset
;
3804 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
,
3810 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3811 _("unsupported reloc %u"), r_type
);
3814 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
3815 if (!is_executable
&& optimized_type
== tls::TLSOPT_TO_LE
)
3817 // See above comment for R_X86_64_TLSGD.
3818 optimized_type
= tls::TLSOPT_NONE
;
3820 if (optimized_type
== tls::TLSOPT_TO_LE
)
3822 if (tls_segment
== NULL
)
3824 gold_assert(parameters
->errors()->error_count() > 0
3825 || issue_undefined_symbol_error(gsym
));
3828 this->tls_ld_to_le(relinfo
, relnum
, tls_segment
, rela
, r_type
,
3829 value
, view
, view_size
);
3832 else if (optimized_type
== tls::TLSOPT_NONE
)
3834 // Relocate the field with the offset of the GOT entry for
3835 // the module index.
3836 unsigned int got_offset
;
3837 got_offset
= (target
->got_mod_index_entry(NULL
, NULL
, NULL
)
3838 - target
->got_size());
3839 value
= target
->got_plt_section()->address() + got_offset
;
3840 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
,
3844 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3845 _("unsupported reloc %u"), r_type
);
3848 case elfcpp::R_X86_64_DTPOFF32
:
3849 // This relocation type is used in debugging information.
3850 // In that case we need to not optimize the value. If the
3851 // section is not executable, then we assume we should not
3852 // optimize this reloc. See comments above for R_X86_64_TLSGD,
3853 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
3855 if (optimized_type
== tls::TLSOPT_TO_LE
&& is_executable
)
3857 if (tls_segment
== NULL
)
3859 gold_assert(parameters
->errors()->error_count() > 0
3860 || issue_undefined_symbol_error(gsym
));
3863 value
-= tls_segment
->memsz();
3865 Relocate_functions
<size
, false>::rela32(view
, value
, addend
);
3868 case elfcpp::R_X86_64_DTPOFF64
:
3869 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
3870 if (optimized_type
== tls::TLSOPT_TO_LE
&& is_executable
)
3872 if (tls_segment
== NULL
)
3874 gold_assert(parameters
->errors()->error_count() > 0
3875 || issue_undefined_symbol_error(gsym
));
3878 value
-= tls_segment
->memsz();
3880 Relocate_functions
<size
, false>::rela64(view
, value
, addend
);
3883 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
3885 && gsym
->is_undefined()
3886 && parameters
->options().output_is_executable())
3888 Target_x86_64
<size
>::Relocate::tls_ie_to_le(relinfo
, relnum
,
3890 r_type
, value
, view
,
3894 else if (optimized_type
== tls::TLSOPT_TO_LE
)
3896 if (tls_segment
== NULL
)
3898 gold_assert(parameters
->errors()->error_count() > 0
3899 || issue_undefined_symbol_error(gsym
));
3902 Target_x86_64
<size
>::Relocate::tls_ie_to_le(relinfo
, relnum
,
3904 r_type
, value
, view
,
3908 else if (optimized_type
== tls::TLSOPT_NONE
)
3910 // Relocate the field with the offset of the GOT entry for
3911 // the tp-relative offset of the symbol.
3912 unsigned int got_offset
;
3915 gold_assert(gsym
->has_got_offset(GOT_TYPE_TLS_OFFSET
));
3916 got_offset
= (gsym
->got_offset(GOT_TYPE_TLS_OFFSET
)
3917 - target
->got_size());
3921 unsigned int r_sym
= elfcpp::elf_r_sym
<size
>(rela
.get_r_info());
3922 gold_assert(object
->local_has_got_offset(r_sym
,
3923 GOT_TYPE_TLS_OFFSET
));
3924 got_offset
= (object
->local_got_offset(r_sym
, GOT_TYPE_TLS_OFFSET
)
3925 - target
->got_size());
3927 value
= target
->got_plt_section()->address() + got_offset
;
3928 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
,
3932 gold_error_at_location(relinfo
, relnum
, rela
.get_r_offset(),
3933 _("unsupported reloc type %u"),
3937 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
3938 if (tls_segment
== NULL
)
3940 gold_assert(parameters
->errors()->error_count() > 0
3941 || issue_undefined_symbol_error(gsym
));
3944 value
-= tls_segment
->memsz();
3945 Relocate_functions
<size
, false>::rela32(view
, value
, addend
);
3950 // Do a relocation in which we convert a TLS General-Dynamic to an
3955 Target_x86_64
<size
>::Relocate::tls_gd_to_ie(
3956 const Relocate_info
<size
, false>* relinfo
,
3959 const elfcpp::Rela
<size
, false>& rela
,
3961 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
3962 unsigned char* view
,
3963 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
3964 section_size_type view_size
)
3967 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3968 // .word 0x6666; rex64; call __tls_get_addr
3969 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
3971 // leaq foo@tlsgd(%rip),%rdi;
3972 // .word 0x6666; rex64; call __tls_get_addr
3973 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
3975 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
3976 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
3977 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
3981 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
,
3983 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
3984 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
3985 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3990 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
,
3992 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
3993 (memcmp(view
- 3, "\x48\x8d\x3d", 3) == 0));
3994 memcpy(view
- 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3998 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
3999 Relocate_functions
<size
, false>::pcrela32(view
+ 8, value
, addend
- 8,
4002 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4004 this->skip_call_tls_get_addr_
= true;
4007 // Do a relocation in which we convert a TLS General-Dynamic to a
4012 Target_x86_64
<size
>::Relocate::tls_gd_to_le(
4013 const Relocate_info
<size
, false>* relinfo
,
4015 Output_segment
* tls_segment
,
4016 const elfcpp::Rela
<size
, false>& rela
,
4018 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
4019 unsigned char* view
,
4020 section_size_type view_size
)
4023 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4024 // .word 0x6666; rex64; call __tls_get_addr
4025 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
4027 // leaq foo@tlsgd(%rip),%rdi;
4028 // .word 0x6666; rex64; call __tls_get_addr
4029 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
4031 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 12);
4032 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4033 (memcmp(view
+ 4, "\x66\x66\x48\xe8", 4) == 0));
4037 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
,
4039 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4040 (memcmp(view
- 4, "\x66\x48\x8d\x3d", 4) == 0));
4041 memcpy(view
- 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4046 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
,
4048 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4049 (memcmp(view
- 3, "\x48\x8d\x3d", 3) == 0));
4051 memcpy(view
- 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4055 value
-= tls_segment
->memsz();
4056 Relocate_functions
<size
, false>::rela32(view
+ 8, value
, 0);
4058 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4060 this->skip_call_tls_get_addr_
= true;
4063 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
4067 Target_x86_64
<size
>::Relocate::tls_desc_gd_to_ie(
4068 const Relocate_info
<size
, false>* relinfo
,
4071 const elfcpp::Rela
<size
, false>& rela
,
4072 unsigned int r_type
,
4073 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
4074 unsigned char* view
,
4075 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
4076 section_size_type view_size
)
4078 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
4080 // leaq foo@tlsdesc(%rip), %rax
4081 // ==> movq foo@gottpoff(%rip), %rax
4082 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
4083 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
4084 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4085 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
4087 const elfcpp::Elf_Xword addend
= rela
.get_r_addend();
4088 Relocate_functions
<size
, false>::pcrela32(view
, value
, addend
, address
);
4092 // call *foo@tlscall(%rax)
4094 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
4095 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
4096 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4097 view
[0] == 0xff && view
[1] == 0x10);
4103 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
4107 Target_x86_64
<size
>::Relocate::tls_desc_gd_to_le(
4108 const Relocate_info
<size
, false>* relinfo
,
4110 Output_segment
* tls_segment
,
4111 const elfcpp::Rela
<size
, false>& rela
,
4112 unsigned int r_type
,
4113 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
4114 unsigned char* view
,
4115 section_size_type view_size
)
4117 if (r_type
== elfcpp::R_X86_64_GOTPC32_TLSDESC
)
4119 // leaq foo@tlsdesc(%rip), %rax
4120 // ==> movq foo@tpoff, %rax
4121 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
4122 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
4123 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4124 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x05);
4127 value
-= tls_segment
->memsz();
4128 Relocate_functions
<size
, false>::rela32(view
, value
, 0);
4132 // call *foo@tlscall(%rax)
4134 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC_CALL
);
4135 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 2);
4136 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4137 view
[0] == 0xff && view
[1] == 0x10);
4145 Target_x86_64
<size
>::Relocate::tls_ld_to_le(
4146 const Relocate_info
<size
, false>* relinfo
,
4149 const elfcpp::Rela
<size
, false>& rela
,
4151 typename
elfcpp::Elf_types
<size
>::Elf_Addr
,
4152 unsigned char* view
,
4153 section_size_type view_size
)
4155 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
4157 // ... leq foo@dtpoff(%rax),%reg
4158 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
4160 // ... leq foo@dtpoff(%rax),%reg
4161 // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
4163 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
4164 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 9);
4166 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(),
4167 view
[-3] == 0x48 && view
[-2] == 0x8d && view
[-1] == 0x3d);
4169 tls::check_tls(relinfo
, relnum
, rela
.get_r_offset(), view
[4] == 0xe8);
4172 memcpy(view
- 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
4174 memcpy(view
- 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
4176 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4178 this->skip_call_tls_get_addr_
= true;
4181 // Do a relocation in which we convert a TLS Initial-Exec to a
4186 Target_x86_64
<size
>::Relocate::tls_ie_to_le(
4187 const Relocate_info
<size
, false>* relinfo
,
4189 Output_segment
* tls_segment
,
4190 const elfcpp::Rela
<size
, false>& rela
,
4192 typename
elfcpp::Elf_types
<size
>::Elf_Addr value
,
4193 unsigned char* view
,
4194 section_size_type view_size
)
4196 // We need to examine the opcodes to figure out which instruction we
4199 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
4200 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
4202 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, -3);
4203 tls::check_range(relinfo
, relnum
, rela
.get_r_offset(), view_size
, 4);
4205 unsigned char op1
= view
[-3];
4206 unsigned char op2
= view
[-2];
4207 unsigned char op3
= view
[-1];
4208 unsigned char reg
= op3
>> 3;
4215 else if (size
== 32 && op1
== 0x44)
4218 view
[-1] = 0xc0 | reg
;
4222 // Special handling for %rsp.
4225 else if (size
== 32 && op1
== 0x44)
4228 view
[-1] = 0xc0 | reg
;
4235 else if (size
== 32 && op1
== 0x44)
4238 view
[-1] = 0x80 | reg
| (reg
<< 3);
4241 if (tls_segment
!= NULL
)
4242 value
-= tls_segment
->memsz();
4243 Relocate_functions
<size
, false>::rela32(view
, value
, 0);
4246 // Relocate section data.
4250 Target_x86_64
<size
>::relocate_section(
4251 const Relocate_info
<size
, false>* relinfo
,
4252 unsigned int sh_type
,
4253 const unsigned char* prelocs
,
4255 Output_section
* output_section
,
4256 bool needs_special_offset_handling
,
4257 unsigned char* view
,
4258 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
4259 section_size_type view_size
,
4260 const Reloc_symbol_changes
* reloc_symbol_changes
)
4262 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4264 gold::relocate_section
<size
, false, Target_x86_64
<size
>, elfcpp::SHT_RELA
,
4265 typename Target_x86_64
<size
>::Relocate
,
4266 gold::Default_comdat_behavior
>(
4272 needs_special_offset_handling
,
4276 reloc_symbol_changes
);
4279 // Apply an incremental relocation. Incremental relocations always refer
4280 // to global symbols.
4284 Target_x86_64
<size
>::apply_relocation(
4285 const Relocate_info
<size
, false>* relinfo
,
4286 typename
elfcpp::Elf_types
<size
>::Elf_Addr r_offset
,
4287 unsigned int r_type
,
4288 typename
elfcpp::Elf_types
<size
>::Elf_Swxword r_addend
,
4290 unsigned char* view
,
4291 typename
elfcpp::Elf_types
<size
>::Elf_Addr address
,
4292 section_size_type view_size
)
4294 gold::apply_relocation
<size
, false, Target_x86_64
<size
>,
4295 typename Target_x86_64
<size
>::Relocate
>(
4307 // Return the size of a relocation while scanning during a relocatable
4312 Target_x86_64
<size
>::Relocatable_size_for_reloc::get_size_for_reloc(
4313 unsigned int r_type
,
4318 case elfcpp::R_X86_64_NONE
:
4319 case elfcpp::R_X86_64_GNU_VTINHERIT
:
4320 case elfcpp::R_X86_64_GNU_VTENTRY
:
4321 case elfcpp::R_X86_64_TLSGD
: // Global-dynamic
4322 case elfcpp::R_X86_64_GOTPC32_TLSDESC
: // Global-dynamic (from ~oliva url)
4323 case elfcpp::R_X86_64_TLSDESC_CALL
:
4324 case elfcpp::R_X86_64_TLSLD
: // Local-dynamic
4325 case elfcpp::R_X86_64_DTPOFF32
:
4326 case elfcpp::R_X86_64_DTPOFF64
:
4327 case elfcpp::R_X86_64_GOTTPOFF
: // Initial-exec
4328 case elfcpp::R_X86_64_TPOFF32
: // Local-exec
4331 case elfcpp::R_X86_64_64
:
4332 case elfcpp::R_X86_64_PC64
:
4333 case elfcpp::R_X86_64_GOTOFF64
:
4334 case elfcpp::R_X86_64_GOTPC64
:
4335 case elfcpp::R_X86_64_PLTOFF64
:
4336 case elfcpp::R_X86_64_GOT64
:
4337 case elfcpp::R_X86_64_GOTPCREL64
:
4338 case elfcpp::R_X86_64_GOTPCREL
:
4339 case elfcpp::R_X86_64_GOTPCRELX
:
4340 case elfcpp::R_X86_64_REX_GOTPCRELX
:
4341 case elfcpp::R_X86_64_GOTPLT64
:
4344 case elfcpp::R_X86_64_32
:
4345 case elfcpp::R_X86_64_32S
:
4346 case elfcpp::R_X86_64_PC32
:
4347 case elfcpp::R_X86_64_PC32_BND
:
4348 case elfcpp::R_X86_64_PLT32
:
4349 case elfcpp::R_X86_64_PLT32_BND
:
4350 case elfcpp::R_X86_64_GOTPC32
:
4351 case elfcpp::R_X86_64_GOT32
:
4354 case elfcpp::R_X86_64_16
:
4355 case elfcpp::R_X86_64_PC16
:
4358 case elfcpp::R_X86_64_8
:
4359 case elfcpp::R_X86_64_PC8
:
4362 case elfcpp::R_X86_64_COPY
:
4363 case elfcpp::R_X86_64_GLOB_DAT
:
4364 case elfcpp::R_X86_64_JUMP_SLOT
:
4365 case elfcpp::R_X86_64_RELATIVE
:
4366 case elfcpp::R_X86_64_IRELATIVE
:
4367 // These are outstanding tls relocs, which are unexpected when linking
4368 case elfcpp::R_X86_64_TPOFF64
:
4369 case elfcpp::R_X86_64_DTPMOD64
:
4370 case elfcpp::R_X86_64_TLSDESC
:
4371 object
->error(_("unexpected reloc %u in object file"), r_type
);
4374 case elfcpp::R_X86_64_SIZE32
:
4375 case elfcpp::R_X86_64_SIZE64
:
4377 object
->error(_("unsupported reloc %u against local symbol"), r_type
);
4382 // Scan the relocs during a relocatable link.
4386 Target_x86_64
<size
>::scan_relocatable_relocs(
4387 Symbol_table
* symtab
,
4389 Sized_relobj_file
<size
, false>* object
,
4390 unsigned int data_shndx
,
4391 unsigned int sh_type
,
4392 const unsigned char* prelocs
,
4394 Output_section
* output_section
,
4395 bool needs_special_offset_handling
,
4396 size_t local_symbol_count
,
4397 const unsigned char* plocal_symbols
,
4398 Relocatable_relocs
* rr
)
4400 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4402 typedef gold::Default_scan_relocatable_relocs
<elfcpp::SHT_RELA
,
4403 Relocatable_size_for_reloc
> Scan_relocatable_relocs
;
4405 gold::scan_relocatable_relocs
<size
, false, elfcpp::SHT_RELA
,
4406 Scan_relocatable_relocs
>(
4414 needs_special_offset_handling
,
4420 // Relocate a section during a relocatable link.
4424 Target_x86_64
<size
>::relocate_relocs(
4425 const Relocate_info
<size
, false>* relinfo
,
4426 unsigned int sh_type
,
4427 const unsigned char* prelocs
,
4429 Output_section
* output_section
,
4430 typename
elfcpp::Elf_types
<size
>::Elf_Off offset_in_output_section
,
4431 const Relocatable_relocs
* rr
,
4432 unsigned char* view
,
4433 typename
elfcpp::Elf_types
<size
>::Elf_Addr view_address
,
4434 section_size_type view_size
,
4435 unsigned char* reloc_view
,
4436 section_size_type reloc_view_size
)
4438 gold_assert(sh_type
== elfcpp::SHT_RELA
);
4440 gold::relocate_relocs
<size
, false, elfcpp::SHT_RELA
>(
4445 offset_in_output_section
,
4454 // Return the value to use for a dynamic which requires special
4455 // treatment. This is how we support equality comparisons of function
4456 // pointers across shared library boundaries, as described in the
4457 // processor specific ABI supplement.
4461 Target_x86_64
<size
>::do_dynsym_value(const Symbol
* gsym
) const
4463 gold_assert(gsym
->is_from_dynobj() && gsym
->has_plt_offset());
4464 return this->plt_address_for_global(gsym
);
4467 // Return a string used to fill a code section with nops to take up
4468 // the specified length.
4472 Target_x86_64
<size
>::do_code_fill(section_size_type length
) const
4476 // Build a jmpq instruction to skip over the bytes.
4477 unsigned char jmp
[5];
4479 elfcpp::Swap_unaligned
<32, false>::writeval(jmp
+ 1, length
- 5);
4480 return (std::string(reinterpret_cast<char*>(&jmp
[0]), 5)
4481 + std::string(length
- 5, static_cast<char>(0x90)));
4484 // Nop sequences of various lengths.
4485 const char nop1
[1] = { '\x90' }; // nop
4486 const char nop2
[2] = { '\x66', '\x90' }; // xchg %ax %ax
4487 const char nop3
[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4488 const char nop4
[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
4490 const char nop5
[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
4492 const char nop6
[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
4493 '\x44', '\x00', '\x00' };
4494 const char nop7
[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
4495 '\x00', '\x00', '\x00',
4497 const char nop8
[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
4498 '\x00', '\x00', '\x00',
4500 const char nop9
[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
4501 '\x84', '\x00', '\x00',
4502 '\x00', '\x00', '\x00' };
4503 const char nop10
[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4504 '\x1f', '\x84', '\x00',
4505 '\x00', '\x00', '\x00',
4507 const char nop11
[11] = { '\x66', '\x66', '\x2e', // data16
4508 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4509 '\x00', '\x00', '\x00',
4511 const char nop12
[12] = { '\x66', '\x66', '\x66', // data16; data16
4512 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4513 '\x84', '\x00', '\x00',
4514 '\x00', '\x00', '\x00' };
4515 const char nop13
[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
4516 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4517 '\x1f', '\x84', '\x00',
4518 '\x00', '\x00', '\x00',
4520 const char nop14
[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
4521 '\x66', '\x66', '\x2e', // data16
4522 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4523 '\x00', '\x00', '\x00',
4525 const char nop15
[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
4526 '\x66', '\x66', '\x66', // data16; data16
4527 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4528 '\x84', '\x00', '\x00',
4529 '\x00', '\x00', '\x00' };
4531 const char* nops
[16] = {
4533 nop1
, nop2
, nop3
, nop4
, nop5
, nop6
, nop7
,
4534 nop8
, nop9
, nop10
, nop11
, nop12
, nop13
, nop14
, nop15
4537 return std::string(nops
[length
], length
);
4540 // Return the addend to use for a target specific relocation. The
4541 // only target specific relocation is R_X86_64_TLSDESC for a local
4542 // symbol. We want to set the addend is the offset of the local
4543 // symbol in the TLS segment.
4547 Target_x86_64
<size
>::do_reloc_addend(void* arg
, unsigned int r_type
,
4550 gold_assert(r_type
== elfcpp::R_X86_64_TLSDESC
);
4551 uintptr_t intarg
= reinterpret_cast<uintptr_t>(arg
);
4552 gold_assert(intarg
< this->tlsdesc_reloc_info_
.size());
4553 const Tlsdesc_info
& ti(this->tlsdesc_reloc_info_
[intarg
]);
4554 const Symbol_value
<size
>* psymval
= ti
.object
->local_symbol(ti
.r_sym
);
4555 gold_assert(psymval
->is_tls_symbol());
4556 // The value of a TLS symbol is the offset in the TLS segment.
4557 return psymval
->value(ti
.object
, 0);
4560 // Return the value to use for the base of a DW_EH_PE_datarel offset
4561 // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
4562 // assembler can not write out the difference between two labels in
4563 // different sections, so instead of using a pc-relative value they
4564 // use an offset from the GOT.
4568 Target_x86_64
<size
>::do_ehframe_datarel_base() const
4570 gold_assert(this->global_offset_table_
!= NULL
);
4571 Symbol
* sym
= this->global_offset_table_
;
4572 Sized_symbol
<size
>* ssym
= static_cast<Sized_symbol
<size
>*>(sym
);
4573 return ssym
->value();
4576 // FNOFFSET in section SHNDX in OBJECT is the start of a function
4577 // compiled with -fsplit-stack. The function calls non-split-stack
4578 // code. We have to change the function so that it always ensures
4579 // that it has enough stack space to run some random function.
4581 static const unsigned char cmp_insn_32
[] = { 0x64, 0x3b, 0x24, 0x25 };
4582 static const unsigned char lea_r10_insn_32
[] = { 0x44, 0x8d, 0x94, 0x24 };
4583 static const unsigned char lea_r11_insn_32
[] = { 0x44, 0x8d, 0x9c, 0x24 };
4585 static const unsigned char cmp_insn_64
[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 };
4586 static const unsigned char lea_r10_insn_64
[] = { 0x4c, 0x8d, 0x94, 0x24 };
4587 static const unsigned char lea_r11_insn_64
[] = { 0x4c, 0x8d, 0x9c, 0x24 };
4591 Target_x86_64
<size
>::do_calls_non_split(Relobj
* object
, unsigned int shndx
,
4592 section_offset_type fnoffset
,
4593 section_size_type fnsize
,
4594 unsigned char* view
,
4595 section_size_type view_size
,
4597 std::string
* to
) const
4599 const char* const cmp_insn
= reinterpret_cast<const char*>
4600 (size
== 32 ? cmp_insn_32
: cmp_insn_64
);
4601 const char* const lea_r10_insn
= reinterpret_cast<const char*>
4602 (size
== 32 ? lea_r10_insn_32
: lea_r10_insn_64
);
4603 const char* const lea_r11_insn
= reinterpret_cast<const char*>
4604 (size
== 32 ? lea_r11_insn_32
: lea_r11_insn_64
);
4606 const size_t cmp_insn_len
=
4607 (size
== 32 ? sizeof(cmp_insn_32
) : sizeof(cmp_insn_64
));
4608 const size_t lea_r10_insn_len
=
4609 (size
== 32 ? sizeof(lea_r10_insn_32
) : sizeof(lea_r10_insn_64
));
4610 const size_t lea_r11_insn_len
=
4611 (size
== 32 ? sizeof(lea_r11_insn_32
) : sizeof(lea_r11_insn_64
));
4612 const size_t nop_len
= (size
== 32 ? 7 : 8);
4614 // The function starts with a comparison of the stack pointer and a
4615 // field in the TCB. This is followed by a jump.
4618 if (this->match_view(view
, view_size
, fnoffset
, cmp_insn
, cmp_insn_len
)
4619 && fnsize
> nop_len
+ 1)
4621 // We will call __morestack if the carry flag is set after this
4622 // comparison. We turn the comparison into an stc instruction
4624 view
[fnoffset
] = '\xf9';
4625 this->set_view_to_nop(view
, view_size
, fnoffset
+ 1, nop_len
);
4627 // lea NN(%rsp),%r10
4628 // lea NN(%rsp),%r11
4629 else if ((this->match_view(view
, view_size
, fnoffset
,
4630 lea_r10_insn
, lea_r10_insn_len
)
4631 || this->match_view(view
, view_size
, fnoffset
,
4632 lea_r11_insn
, lea_r11_insn_len
))
4635 // This is loading an offset from the stack pointer for a
4636 // comparison. The offset is negative, so we decrease the
4637 // offset by the amount of space we need for the stack. This
4638 // means we will avoid calling __morestack if there happens to
4639 // be plenty of space on the stack already.
4640 unsigned char* pval
= view
+ fnoffset
+ 4;
4641 uint32_t val
= elfcpp::Swap_unaligned
<32, false>::readval(pval
);
4642 val
-= parameters
->options().split_stack_adjust_size();
4643 elfcpp::Swap_unaligned
<32, false>::writeval(pval
, val
);
4647 if (!object
->has_no_split_stack())
4648 object
->error(_("failed to match split-stack sequence at "
4649 "section %u offset %0zx"),
4650 shndx
, static_cast<size_t>(fnoffset
));
4654 // We have to change the function so that it calls
4655 // __morestack_non_split instead of __morestack. The former will
4656 // allocate additional stack space.
4657 *from
= "__morestack";
4658 *to
= "__morestack_non_split";
4661 // The selector for x86_64 object files. Note this is never instantiated
4662 // directly. It's only used in Target_selector_x86_64_nacl, below.
4665 class Target_selector_x86_64
: public Target_selector_freebsd
4668 Target_selector_x86_64()
4669 : Target_selector_freebsd(elfcpp::EM_X86_64
, size
, false,
4671 ? "elf64-x86-64" : "elf32-x86-64"),
4673 ? "elf64-x86-64-freebsd"
4674 : "elf32-x86-64-freebsd"),
4675 (size
== 64 ? "elf_x86_64" : "elf32_x86_64"))
4679 do_instantiate_target()
4680 { return new Target_x86_64
<size
>(); }
4684 // NaCl variant. It uses different PLT contents.
4687 class Output_data_plt_x86_64_nacl
: public Output_data_plt_x86_64
<size
>
4690 Output_data_plt_x86_64_nacl(Layout
* layout
,
4691 Output_data_got
<64, false>* got
,
4692 Output_data_got_plt_x86_64
* got_plt
,
4693 Output_data_space
* got_irelative
)
4694 : Output_data_plt_x86_64
<size
>(layout
, plt_entry_size
,
4695 got
, got_plt
, got_irelative
)
4698 Output_data_plt_x86_64_nacl(Layout
* layout
,
4699 Output_data_got
<64, false>* got
,
4700 Output_data_got_plt_x86_64
* got_plt
,
4701 Output_data_space
* got_irelative
,
4702 unsigned int plt_count
)
4703 : Output_data_plt_x86_64
<size
>(layout
, plt_entry_size
,
4704 got
, got_plt
, got_irelative
,
4709 virtual unsigned int
4710 do_get_plt_entry_size() const
4711 { return plt_entry_size
; }
4714 do_add_eh_frame(Layout
* layout
)
4716 layout
->add_eh_frame_for_plt(this,
4717 this->plt_eh_frame_cie
,
4718 this->plt_eh_frame_cie_size
,
4720 plt_eh_frame_fde_size
);
4724 do_fill_first_plt_entry(unsigned char* pov
,
4725 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_addr
,
4726 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_addr
);
4728 virtual unsigned int
4729 do_fill_plt_entry(unsigned char* pov
,
4730 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
4731 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
4732 unsigned int got_offset
,
4733 unsigned int plt_offset
,
4734 unsigned int plt_index
);
4737 do_fill_tlsdesc_entry(unsigned char* pov
,
4738 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
4739 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
4740 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
,
4741 unsigned int tlsdesc_got_offset
,
4742 unsigned int plt_offset
);
4745 // The size of an entry in the PLT.
4746 static const int plt_entry_size
= 64;
4748 // The first entry in the PLT.
4749 static const unsigned char first_plt_entry
[plt_entry_size
];
4751 // Other entries in the PLT for an executable.
4752 static const unsigned char plt_entry
[plt_entry_size
];
4754 // The reserved TLSDESC entry in the PLT for an executable.
4755 static const unsigned char tlsdesc_plt_entry
[plt_entry_size
];
4757 // The .eh_frame unwind information for the PLT.
4758 static const int plt_eh_frame_fde_size
= 32;
4759 static const unsigned char plt_eh_frame_fde
[plt_eh_frame_fde_size
];
4763 class Target_x86_64_nacl
: public Target_x86_64
<size
>
4766 Target_x86_64_nacl()
4767 : Target_x86_64
<size
>(&x86_64_nacl_info
)
4770 virtual Output_data_plt_x86_64
<size
>*
4771 do_make_data_plt(Layout
* layout
,
4772 Output_data_got
<64, false>* got
,
4773 Output_data_got_plt_x86_64
* got_plt
,
4774 Output_data_space
* got_irelative
)
4776 return new Output_data_plt_x86_64_nacl
<size
>(layout
, got
, got_plt
,
4780 virtual Output_data_plt_x86_64
<size
>*
4781 do_make_data_plt(Layout
* layout
,
4782 Output_data_got
<64, false>* got
,
4783 Output_data_got_plt_x86_64
* got_plt
,
4784 Output_data_space
* got_irelative
,
4785 unsigned int plt_count
)
4787 return new Output_data_plt_x86_64_nacl
<size
>(layout
, got
, got_plt
,
4793 do_code_fill(section_size_type length
) const;
4796 static const Target::Target_info x86_64_nacl_info
;
4800 const Target::Target_info Target_x86_64_nacl
<64>::x86_64_nacl_info
=
4803 false, // is_big_endian
4804 elfcpp::EM_X86_64
, // machine_code
4805 false, // has_make_symbol
4806 false, // has_resolve
4807 true, // has_code_fill
4808 true, // is_default_stack_executable
4809 true, // can_icf_inline_merge_sections
4811 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
4812 0x20000, // default_text_segment_address
4813 0x10000, // abi_pagesize (overridable by -z max-page-size)
4814 0x10000, // common_pagesize (overridable by -z common-page-size)
4815 true, // isolate_execinstr
4816 0x10000000, // rosegment_gap
4817 elfcpp::SHN_UNDEF
, // small_common_shndx
4818 elfcpp::SHN_X86_64_LCOMMON
, // large_common_shndx
4819 0, // small_common_section_flags
4820 elfcpp::SHF_X86_64_LARGE
, // large_common_section_flags
4821 NULL
, // attributes_section
4822 NULL
, // attributes_vendor
4823 "_start", // entry_symbol_name
4824 32, // hash_entry_size
4828 const Target::Target_info Target_x86_64_nacl
<32>::x86_64_nacl_info
=
4831 false, // is_big_endian
4832 elfcpp::EM_X86_64
, // machine_code
4833 false, // has_make_symbol
4834 false, // has_resolve
4835 true, // has_code_fill
4836 true, // is_default_stack_executable
4837 true, // can_icf_inline_merge_sections
4839 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
4840 0x20000, // default_text_segment_address
4841 0x10000, // abi_pagesize (overridable by -z max-page-size)
4842 0x10000, // common_pagesize (overridable by -z common-page-size)
4843 true, // isolate_execinstr
4844 0x10000000, // rosegment_gap
4845 elfcpp::SHN_UNDEF
, // small_common_shndx
4846 elfcpp::SHN_X86_64_LCOMMON
, // large_common_shndx
4847 0, // small_common_section_flags
4848 elfcpp::SHF_X86_64_LARGE
, // large_common_section_flags
4849 NULL
, // attributes_section
4850 NULL
, // attributes_vendor
4851 "_start", // entry_symbol_name
4852 32, // hash_entry_size
4855 #define NACLMASK 0xe0 // 32-byte alignment mask.
4857 // The first entry in the PLT.
4861 Output_data_plt_x86_64_nacl
<size
>::first_plt_entry
[plt_entry_size
] =
4863 0xff, 0x35, // pushq contents of memory address
4864 0, 0, 0, 0, // replaced with address of .got + 8
4865 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
4866 0, 0, 0, 0, // replaced with address of .got + 16
4867 0x41, 0x83, 0xe3, NACLMASK
, // and $-32, %r11d
4868 0x4d, 0x01, 0xfb, // add %r15, %r11
4869 0x41, 0xff, 0xe3, // jmpq *%r11
4871 // 9-byte nop sequence to pad out to the next 32-byte boundary.
4872 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
4874 // 32 bytes of nop to pad out to the standard size
4875 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4876 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4877 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4878 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4879 0x66, // excess data32 prefix
4885 Output_data_plt_x86_64_nacl
<size
>::do_fill_first_plt_entry(
4887 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
4888 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
)
4890 memcpy(pov
, first_plt_entry
, plt_entry_size
);
4891 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
4893 - (plt_address
+ 2 + 4)));
4894 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 9,
4896 - (plt_address
+ 9 + 4)));
4899 // Subsequent entries in the PLT.
4903 Output_data_plt_x86_64_nacl
<size
>::plt_entry
[plt_entry_size
] =
4905 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
4906 0, 0, 0, 0, // replaced with address of symbol in .got
4907 0x41, 0x83, 0xe3, NACLMASK
, // and $-32, %r11d
4908 0x4d, 0x01, 0xfb, // add %r15, %r11
4909 0x41, 0xff, 0xe3, // jmpq *%r11
4911 // 15-byte nop sequence to pad out to the next 32-byte boundary.
4912 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4913 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4915 // Lazy GOT entries point here (32-byte aligned).
4916 0x68, // pushq immediate
4917 0, 0, 0, 0, // replaced with index into relocation table
4918 0xe9, // jmp relative
4919 0, 0, 0, 0, // replaced with offset to start of .plt0
4921 // 22 bytes of nop to pad out to the standard size.
4922 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4923 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4924 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
4929 Output_data_plt_x86_64_nacl
<size
>::do_fill_plt_entry(
4931 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
4932 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
4933 unsigned int got_offset
,
4934 unsigned int plt_offset
,
4935 unsigned int plt_index
)
4937 memcpy(pov
, plt_entry
, plt_entry_size
);
4938 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 3,
4939 (got_address
+ got_offset
4940 - (plt_address
+ plt_offset
4943 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 33, plt_index
);
4944 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 38,
4945 - (plt_offset
+ 38 + 4));
4950 // The reserved TLSDESC entry in the PLT.
4954 Output_data_plt_x86_64_nacl
<size
>::tlsdesc_plt_entry
[plt_entry_size
] =
4956 0xff, 0x35, // pushq x(%rip)
4957 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
4958 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
4959 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
4960 0x41, 0x83, 0xe3, NACLMASK
, // and $-32, %r11d
4961 0x4d, 0x01, 0xfb, // add %r15, %r11
4962 0x41, 0xff, 0xe3, // jmpq *%r11
4964 // 41 bytes of nop to pad out to the standard size.
4965 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4966 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4967 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4968 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4969 0x66, 0x66, // excess data32 prefixes
4970 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4975 Output_data_plt_x86_64_nacl
<size
>::do_fill_tlsdesc_entry(
4977 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_address
,
4978 typename
elfcpp::Elf_types
<size
>::Elf_Addr plt_address
,
4979 typename
elfcpp::Elf_types
<size
>::Elf_Addr got_base
,
4980 unsigned int tlsdesc_got_offset
,
4981 unsigned int plt_offset
)
4983 memcpy(pov
, tlsdesc_plt_entry
, plt_entry_size
);
4984 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 2,
4986 - (plt_address
+ plt_offset
4988 elfcpp::Swap_unaligned
<32, false>::writeval(pov
+ 9,
4990 + tlsdesc_got_offset
4991 - (plt_address
+ plt_offset
4995 // The .eh_frame unwind information for the PLT.
4999 Output_data_plt_x86_64_nacl
<size
>::plt_eh_frame_fde
[plt_eh_frame_fde_size
] =
5001 0, 0, 0, 0, // Replaced with offset to .plt.
5002 0, 0, 0, 0, // Replaced with size of .plt.
5003 0, // Augmentation size.
5004 elfcpp::DW_CFA_def_cfa_offset
, 16, // DW_CFA_def_cfa_offset: 16.
5005 elfcpp::DW_CFA_advance_loc
+ 6, // Advance 6 to __PLT__ + 6.
5006 elfcpp::DW_CFA_def_cfa_offset
, 24, // DW_CFA_def_cfa_offset: 24.
5007 elfcpp::DW_CFA_advance_loc
+ 58, // Advance 58 to __PLT__ + 64.
5008 elfcpp::DW_CFA_def_cfa_expression
, // DW_CFA_def_cfa_expression.
5009 13, // Block length.
5010 elfcpp::DW_OP_breg7
, 8, // Push %rsp + 8.
5011 elfcpp::DW_OP_breg16
, 0, // Push %rip.
5012 elfcpp::DW_OP_const1u
, 63, // Push 0x3f.
5013 elfcpp::DW_OP_and
, // & (%rip & 0x3f).
5014 elfcpp::DW_OP_const1u
, 37, // Push 0x25.
5015 elfcpp::DW_OP_ge
, // >= ((%rip & 0x3f) >= 0x25)
5016 elfcpp::DW_OP_lit3
, // Push 3.
5017 elfcpp::DW_OP_shl
, // << (((%rip & 0x3f) >= 0x25) << 3)
5018 elfcpp::DW_OP_plus
, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
5019 elfcpp::DW_CFA_nop
, // Align to 32 bytes.
5023 // Return a string used to fill a code section with nops.
5024 // For NaCl, long NOPs are only valid if they do not cross
5025 // bundle alignment boundaries, so keep it simple with one-byte NOPs.
5028 Target_x86_64_nacl
<size
>::do_code_fill(section_size_type length
) const
5030 return std::string(length
, static_cast<char>(0x90));
5033 // The selector for x86_64-nacl object files.
5036 class Target_selector_x86_64_nacl
5037 : public Target_selector_nacl
<Target_selector_x86_64
<size
>,
5038 Target_x86_64_nacl
<size
> >
5041 Target_selector_x86_64_nacl()
5042 : Target_selector_nacl
<Target_selector_x86_64
<size
>,
5043 Target_x86_64_nacl
<size
> >("x86-64",
5045 ? "elf64-x86-64-nacl"
5046 : "elf32-x86-64-nacl",
5049 : "elf32_x86_64_nacl")
5053 Target_selector_x86_64_nacl
<64> target_selector_x86_64
;
5054 Target_selector_x86_64_nacl
<32> target_selector_x32
;
5056 } // End anonymous namespace.