1 // x86_64.cc -- x86_64 target support for gold.
3 // Copyright (C) 2006-2016 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 // Scan the relocs for --emit-relocs.
501 emit_relocs_scan(Symbol_table* symtab,
503 Sized_relobj_file<size, false>* object,
504 unsigned int data_shndx,
505 unsigned int sh_type,
506 const unsigned char* prelocs,
508 Output_section* output_section,
509 bool needs_special_offset_handling,
510 size_t local_symbol_count,
511 const unsigned char* plocal_syms,
512 Relocatable_relocs* rr);
514 // Emit relocations for a section.
517 const Relocate_info<size, false>*,
518 unsigned int sh_type,
519 const unsigned char* prelocs,
521 Output_section* output_section,
522 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
524 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
525 section_size_type view_size,
526 unsigned char* reloc_view,
527 section_size_type reloc_view_size);
529 // Return a string used to fill a code section with nops.
531 do_code_fill(section_size_type length) const;
533 // Return whether SYM is defined by the ABI.
535 do_is_defined_by_abi(const Symbol* sym) const
536 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
538 // Return the symbol index to use for a target specific relocation.
539 // The only target specific relocation is R_X86_64_TLSDESC for a
540 // local symbol, which is an absolute reloc.
542 do_reloc_symbol_index(void*, unsigned int r_type) const
544 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
548 // Return the addend to use for a target specific relocation.
550 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
552 // Return the PLT section.
554 do_plt_address_for_global(const Symbol* gsym) const
555 { return this->plt_section()->address_for_global(gsym); }
558 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
559 { return this->plt_section()->address_for_local(relobj, symndx); }
561 // This function should be defined in targets that can use relocation
562 // types to determine (implemented in local_reloc_may_be_function_pointer
563 // and global_reloc_may_be_function_pointer)
564 // if a function's pointer is taken. ICF uses this in safe mode to only
565 // fold those functions whose pointer is defintely not taken. For x86_64
566 // pie binaries, safe ICF cannot be done by looking at relocation types.
568 do_can_check_for_function_pointers() const
569 { return !parameters->options().pie(); }
571 // Return the base for a DW_EH_PE_datarel encoding.
573 do_ehframe_datarel_base() const;
575 // Adjust -fsplit-stack code which calls non-split-stack code.
577 do_calls_non_split(Relobj* object, unsigned int shndx,
578 section_offset_type fnoffset, section_size_type fnsize,
579 const unsigned char* prelocs, size_t reloc_count,
580 unsigned char* view, section_size_type view_size,
581 std::string* from, std::string* to) const;
583 // Return the size of the GOT section.
587 gold_assert(this->got_ != NULL);
588 return this->got_->data_size();
591 // Return the number of entries in the GOT.
593 got_entry_count() const
595 if (this->got_ == NULL)
597 return this->got_size() / 8;
600 // Return the number of entries in the PLT.
602 plt_entry_count() const;
604 // Return the offset of the first non-reserved PLT entry.
606 first_plt_entry_offset() const;
608 // Return the size of each PLT entry.
610 plt_entry_size() const;
612 // Return the size of each GOT entry.
614 got_entry_size() const
617 // Create the GOT section for an incremental update.
618 Output_data_got_base*
619 init_got_plt_for_update(Symbol_table* symtab,
621 unsigned int got_count,
622 unsigned int plt_count);
624 // Reserve a GOT entry for a local symbol, and regenerate any
625 // necessary dynamic relocations.
627 reserve_local_got_entry(unsigned int got_index,
628 Sized_relobj<size, false>* obj,
630 unsigned int got_type);
632 // Reserve a GOT entry for a global symbol, and regenerate any
633 // necessary dynamic relocations.
635 reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
636 unsigned int got_type);
638 // Register an existing PLT entry for a global symbol.
640 register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
643 // Force a COPY relocation for a given symbol.
645 emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
647 // Apply an incremental relocation.
649 apply_relocation(const Relocate_info<size, false>* relinfo,
650 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
652 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
655 typename elfcpp::Elf_types<size>::Elf_Addr address,
656 section_size_type view_size);
658 // Add a new reloc argument, returning the index in the vector.
660 add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
662 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
663 return this->tlsdesc_reloc_info_.size() - 1;
666 Output_data_plt_x86_64<size>*
667 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 this->do_make_data_plt(layout, got, got_plt, got_irelative);
675 Output_data_plt_x86_64<size>*
676 make_data_plt(Layout* layout,
677 Output_data_got<64, false>* got,
678 Output_data_got_plt_x86_64* got_plt,
679 Output_data_space* got_irelative,
680 unsigned int plt_count)
682 return this->do_make_data_plt(layout, got, got_plt, got_irelative,
686 virtual Output_data_plt_x86_64<size>*
687 do_make_data_plt(Layout* layout,
688 Output_data_got<64, false>* got,
689 Output_data_got_plt_x86_64* got_plt,
690 Output_data_space* got_irelative)
692 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
696 virtual Output_data_plt_x86_64<size>*
697 do_make_data_plt(Layout* layout,
698 Output_data_got<64, false>* got,
699 Output_data_got_plt_x86_64* got_plt,
700 Output_data_space* got_irelative,
701 unsigned int plt_count)
703 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
709 // The class which scans relocations.
714 : issued_non_pic_error_(false)
718 get_reference_flags(unsigned int r_type);
721 local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
722 Sized_relobj_file<size, false>* object,
723 unsigned int data_shndx,
724 Output_section* output_section,
725 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
726 const elfcpp::Sym<size, false>& lsym,
730 global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
731 Sized_relobj_file<size, false>* object,
732 unsigned int data_shndx,
733 Output_section* output_section,
734 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
738 local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
739 Target_x86_64* target,
740 Sized_relobj_file<size, false>* object,
741 unsigned int data_shndx,
742 Output_section* output_section,
743 const elfcpp::Rela<size, false>& reloc,
745 const elfcpp::Sym<size, false>& lsym);
748 global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
749 Target_x86_64* target,
750 Sized_relobj_file<size, false>* object,
751 unsigned int data_shndx,
752 Output_section* output_section,
753 const elfcpp::Rela<size, false>& reloc,
759 unsupported_reloc_local(Sized_relobj_file<size, false>*,
760 unsigned int r_type);
763 unsupported_reloc_global(Sized_relobj_file<size, false>*,
764 unsigned int r_type, Symbol*);
767 check_non_pic(Relobj*, unsigned int r_type, Symbol*);
770 possible_function_pointer_reloc(unsigned int r_type);
773 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
774 unsigned int r_type);
776 // Whether we have issued an error about a non-PIC compilation.
777 bool issued_non_pic_error_;
780 // The class which implements relocation.
785 : skip_call_tls_get_addr_(false)
790 if (this->skip_call_tls_get_addr_)
792 // FIXME: This needs to specify the location somehow.
793 gold_error(_("missing expected TLS relocation"));
797 // Do a relocation. Return false if the caller should not issue
798 // any warnings about this relocation.
800 relocate(const Relocate_info<size, false>*, unsigned int,
801 Target_x86_64*, Output_section*, size_t, const unsigned char*,
802 const Sized_symbol<size>*, const Symbol_value<size>*,
803 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
807 // Do a TLS relocation.
809 relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
810 size_t relnum, const elfcpp::Rela<size, false>&,
811 unsigned int r_type, const Sized_symbol<size>*,
812 const Symbol_value<size>*,
813 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
816 // Do a TLS General-Dynamic to Initial-Exec transition.
818 tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
819 const elfcpp::Rela<size, false>&, unsigned int r_type,
820 typename elfcpp::Elf_types<size>::Elf_Addr value,
822 typename elfcpp::Elf_types<size>::Elf_Addr,
823 section_size_type view_size);
825 // Do a TLS General-Dynamic to Local-Exec transition.
827 tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
828 Output_segment* tls_segment,
829 const elfcpp::Rela<size, false>&, unsigned int r_type,
830 typename elfcpp::Elf_types<size>::Elf_Addr value,
832 section_size_type view_size);
834 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
836 tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
837 const elfcpp::Rela<size, false>&, unsigned int r_type,
838 typename elfcpp::Elf_types<size>::Elf_Addr value,
840 typename elfcpp::Elf_types<size>::Elf_Addr,
841 section_size_type view_size);
843 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
845 tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
846 Output_segment* tls_segment,
847 const elfcpp::Rela<size, false>&, unsigned int r_type,
848 typename elfcpp::Elf_types<size>::Elf_Addr value,
850 section_size_type view_size);
852 // Do a TLS Local-Dynamic to Local-Exec transition.
854 tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
855 Output_segment* tls_segment,
856 const elfcpp::Rela<size, false>&, unsigned int r_type,
857 typename elfcpp::Elf_types<size>::Elf_Addr value,
859 section_size_type view_size);
861 // Do a TLS Initial-Exec to Local-Exec transition.
863 tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
864 Output_segment* tls_segment,
865 const elfcpp::Rela<size, false>&, unsigned int r_type,
866 typename elfcpp::Elf_types<size>::Elf_Addr value,
868 section_size_type view_size);
870 // This is set if we should skip the next reloc, which should be a
871 // PLT32 reloc against ___tls_get_addr.
872 bool skip_call_tls_get_addr_;
875 // Check if relocation against this symbol is a candidate for
877 // mov foo@GOTPCREL(%rip), %reg
878 // to lea foo(%rip), %reg.
880 can_convert_mov_to_lea(const Symbol* gsym)
882 gold_assert(gsym != NULL);
883 return (gsym->type() != elfcpp::STT_GNU_IFUNC
884 && !gsym->is_undefined ()
885 && !gsym->is_from_dynobj()
886 && !gsym->is_preemptible()
887 && (!parameters->options().shared()
888 || (gsym->visibility() != elfcpp::STV_DEFAULT
889 && gsym->visibility() != elfcpp::STV_PROTECTED)
890 || parameters->options().Bsymbolic())
891 && strcmp(gsym->name(), "_DYNAMIC") != 0);
894 // Adjust TLS relocation type based on the options and whether this
895 // is a local symbol.
896 static tls::Tls_optimization
897 optimize_tls_reloc(bool is_final, int r_type);
899 // Get the GOT section, creating it if necessary.
900 Output_data_got<64, false>*
901 got_section(Symbol_table*, Layout*);
903 // Get the GOT PLT section.
904 Output_data_got_plt_x86_64*
905 got_plt_section() const
907 gold_assert(this->got_plt_ != NULL);
908 return this->got_plt_;
911 // Get the GOT section for TLSDESC entries.
912 Output_data_got<64, false>*
913 got_tlsdesc_section() const
915 gold_assert(this->got_tlsdesc_ != NULL);
916 return this->got_tlsdesc_;
919 // Create the PLT section.
921 make_plt_section(Symbol_table* symtab, Layout* layout);
923 // Create a PLT entry for a global symbol.
925 make_plt_entry(Symbol_table*, Layout*, Symbol*);
927 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
929 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
930 Sized_relobj_file<size, false>* relobj,
931 unsigned int local_sym_index);
933 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
935 define_tls_base_symbol(Symbol_table*, Layout*);
937 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
939 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
941 // Create a GOT entry for the TLS module index.
943 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
944 Sized_relobj_file<size, false>* object);
946 // Get the PLT section.
947 Output_data_plt_x86_64<size>*
950 gold_assert(this->plt_ != NULL);
954 // Get the dynamic reloc section, creating it if necessary.
956 rela_dyn_section(Layout*);
958 // Get the section to use for TLSDESC relocations.
960 rela_tlsdesc_section(Layout*) const;
962 // Get the section to use for IRELATIVE relocations.
964 rela_irelative_section(Layout*);
966 // Add a potential copy relocation.
968 copy_reloc(Symbol_table* symtab, Layout* layout,
969 Sized_relobj_file<size, false>* object,
970 unsigned int shndx, Output_section* output_section,
971 Symbol* sym, const elfcpp::Rela<size, false>& reloc)
973 unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
974 this->copy_relocs_.copy_reloc(symtab, layout,
975 symtab->get_sized_symbol<size>(sym),
976 object, shndx, output_section,
977 r_type, reloc.get_r_offset(),
978 reloc.get_r_addend(),
979 this->rela_dyn_section(layout));
982 // Information about this specific target which we pass to the
983 // general Target structure.
984 static const Target::Target_info x86_64_info;
986 // The types of GOT entries needed for this platform.
987 // These values are exposed to the ABI in an incremental link.
988 // Do not renumber existing values without changing the version
989 // number of the .gnu_incremental_inputs section.
992 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
993 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
994 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
995 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
998 // This type is used as the argument to the target specific
999 // relocation routines. The only target specific reloc is
1000 // R_X86_64_TLSDESC against a local symbol.
1003 Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
1004 : object(a_object), r_sym(a_r_sym)
1007 // The object in which the local symbol is defined.
1008 Sized_relobj_file<size, false>* object;
1009 // The local symbol index in the object.
1014 Output_data_got<64, false>* got_;
1016 Output_data_plt_x86_64<size>* plt_;
1017 // The GOT PLT section.
1018 Output_data_got_plt_x86_64* got_plt_;
1019 // The GOT section for IRELATIVE relocations.
1020 Output_data_space* got_irelative_;
1021 // The GOT section for TLSDESC relocations.
1022 Output_data_got<64, false>* got_tlsdesc_;
1023 // The _GLOBAL_OFFSET_TABLE_ symbol.
1024 Symbol* global_offset_table_;
1025 // The dynamic reloc section.
1026 Reloc_section* rela_dyn_;
1027 // The section to use for IRELATIVE relocs.
1028 Reloc_section* rela_irelative_;
1029 // Relocs saved to avoid a COPY reloc.
1030 Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
1031 // Offset of the GOT entry for the TLS module index.
1032 unsigned int got_mod_index_offset_;
1033 // We handle R_X86_64_TLSDESC against a local symbol as a target
1034 // specific relocation. Here we store the object and local symbol
1035 // index for the relocation.
1036 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
1037 // True if the _TLS_MODULE_BASE_ symbol has been defined.
1038 bool tls_base_symbol_defined_;
1042 const Target::Target_info Target_x86_64<64>::x86_64_info =
1045 false, // is_big_endian
1046 elfcpp::EM_X86_64, // machine_code
1047 false, // has_make_symbol
1048 false, // has_resolve
1049 true, // has_code_fill
1050 true, // is_default_stack_executable
1051 true, // can_icf_inline_merge_sections
1053 "/lib/ld64.so.1", // program interpreter
1054 0x400000, // default_text_segment_address
1055 0x1000, // abi_pagesize (overridable by -z max-page-size)
1056 0x1000, // common_pagesize (overridable by -z common-page-size)
1057 false, // isolate_execinstr
1059 elfcpp::SHN_UNDEF, // small_common_shndx
1060 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1061 0, // small_common_section_flags
1062 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1063 NULL, // attributes_section
1064 NULL, // attributes_vendor
1065 "_start", // entry_symbol_name
1066 32, // hash_entry_size
1070 const Target::Target_info Target_x86_64<32>::x86_64_info =
1073 false, // is_big_endian
1074 elfcpp::EM_X86_64, // machine_code
1075 false, // has_make_symbol
1076 false, // has_resolve
1077 true, // has_code_fill
1078 true, // is_default_stack_executable
1079 true, // can_icf_inline_merge_sections
1081 "/libx32/ldx32.so.1", // program interpreter
1082 0x400000, // default_text_segment_address
1083 0x1000, // abi_pagesize (overridable by -z max-page-size)
1084 0x1000, // common_pagesize (overridable by -z common-page-size)
1085 false, // isolate_execinstr
1087 elfcpp::SHN_UNDEF, // small_common_shndx
1088 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1089 0, // small_common_section_flags
1090 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1091 NULL, // attributes_section
1092 NULL, // attributes_vendor
1093 "_start", // entry_symbol_name
1094 32, // hash_entry_size
1097 // This is called when a new output section is created. This is where
1098 // we handle the SHF_X86_64_LARGE.
1102 Target_x86_64<size>::do_new_output_section(Output_section* os) const
1104 if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1105 os->set_is_large_section();
1108 // Get the GOT section, creating it if necessary.
1111 Output_data_got<64, false>*
1112 Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
1114 if (this->got_ == NULL)
1116 gold_assert(symtab != NULL && layout != NULL);
1118 // When using -z now, we can treat .got.plt as a relro section.
1119 // Without -z now, it is modified after program startup by lazy
1121 bool is_got_plt_relro = parameters->options().now();
1122 Output_section_order got_order = (is_got_plt_relro
1124 : ORDER_RELRO_LAST);
1125 Output_section_order got_plt_order = (is_got_plt_relro
1127 : ORDER_NON_RELRO_FIRST);
1129 this->got_ = new Output_data_got<64, false>();
1131 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1133 | elfcpp::SHF_WRITE),
1134 this->got_, got_order, true);
1136 this->got_plt_ = new Output_data_got_plt_x86_64(layout);
1137 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1139 | elfcpp::SHF_WRITE),
1140 this->got_plt_, got_plt_order,
1143 // The first three entries are reserved.
1144 this->got_plt_->set_current_data_size(3 * 8);
1146 if (!is_got_plt_relro)
1148 // Those bytes can go into the relro segment.
1149 layout->increase_relro(3 * 8);
1152 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1153 this->global_offset_table_ =
1154 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1155 Symbol_table::PREDEFINED,
1157 0, 0, elfcpp::STT_OBJECT,
1159 elfcpp::STV_HIDDEN, 0,
1162 // If there are any IRELATIVE relocations, they get GOT entries
1163 // in .got.plt after the jump slot entries.
1164 this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1165 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1167 | elfcpp::SHF_WRITE),
1168 this->got_irelative_,
1169 got_plt_order, is_got_plt_relro);
1171 // If there are any TLSDESC relocations, they get GOT entries in
1172 // .got.plt after the jump slot and IRELATIVE entries.
1173 this->got_tlsdesc_ = new Output_data_got<64, false>();
1174 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1176 | elfcpp::SHF_WRITE),
1178 got_plt_order, is_got_plt_relro);
1184 // Get the dynamic reloc section, creating it if necessary.
1187 typename Target_x86_64<size>::Reloc_section*
1188 Target_x86_64<size>::rela_dyn_section(Layout* layout)
1190 if (this->rela_dyn_ == NULL)
1192 gold_assert(layout != NULL);
1193 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
1194 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1195 elfcpp::SHF_ALLOC, this->rela_dyn_,
1196 ORDER_DYNAMIC_RELOCS, false);
1198 return this->rela_dyn_;
1201 // Get the section to use for IRELATIVE relocs, creating it if
1202 // necessary. These go in .rela.dyn, but only after all other dynamic
1203 // relocations. They need to follow the other dynamic relocations so
1204 // that they can refer to global variables initialized by those
1208 typename Target_x86_64<size>::Reloc_section*
1209 Target_x86_64<size>::rela_irelative_section(Layout* layout)
1211 if (this->rela_irelative_ == NULL)
1213 // Make sure we have already created the dynamic reloc section.
1214 this->rela_dyn_section(layout);
1215 this->rela_irelative_ = new Reloc_section(false);
1216 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1217 elfcpp::SHF_ALLOC, this->rela_irelative_,
1218 ORDER_DYNAMIC_RELOCS, false);
1219 gold_assert(this->rela_dyn_->output_section()
1220 == this->rela_irelative_->output_section());
1222 return this->rela_irelative_;
1225 // Write the first three reserved words of the .got.plt section.
1226 // The remainder of the section is written while writing the PLT
1227 // in Output_data_plt_i386::do_write.
1230 Output_data_got_plt_x86_64::do_write(Output_file* of)
1232 // The first entry in the GOT is the address of the .dynamic section
1233 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1234 // We saved space for them when we created the section in
1235 // Target_x86_64::got_section.
1236 const off_t got_file_offset = this->offset();
1237 gold_assert(this->data_size() >= 24);
1238 unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
1239 Output_section* dynamic = this->layout_->dynamic_section();
1240 uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1241 elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
1242 memset(got_view + 8, 0, 16);
1243 of->write_output_view(got_file_offset, 24, got_view);
1246 // Initialize the PLT section.
1250 Output_data_plt_x86_64<size>::init(Layout* layout)
1252 this->rel_ = new Reloc_section(false);
1253 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1254 elfcpp::SHF_ALLOC, this->rel_,
1255 ORDER_DYNAMIC_PLT_RELOCS, false);
1260 Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
1262 os->set_entsize(this->get_plt_entry_size());
1265 // Add an entry to the PLT.
1269 Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1272 gold_assert(!gsym->has_plt_offset());
1274 unsigned int plt_index;
1276 section_offset_type got_offset;
1278 unsigned int* pcount;
1279 unsigned int offset;
1280 unsigned int reserved;
1281 Output_section_data_build* got;
1282 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1283 && gsym->can_use_relative_reloc(false))
1285 pcount = &this->irelative_count_;
1288 got = this->got_irelative_;
1292 pcount = &this->count_;
1295 got = this->got_plt_;
1298 if (!this->is_data_size_valid())
1300 // Note that when setting the PLT offset for a non-IRELATIVE
1301 // entry we skip the initial reserved PLT entry.
1302 plt_index = *pcount + offset;
1303 plt_offset = plt_index * this->get_plt_entry_size();
1307 got_offset = (plt_index - offset + reserved) * 8;
1308 gold_assert(got_offset == got->current_data_size());
1310 // Every PLT entry needs a GOT entry which points back to the PLT
1311 // entry (this will be changed by the dynamic linker, normally
1312 // lazily when the function is called).
1313 got->set_current_data_size(got_offset + 8);
1317 // FIXME: This is probably not correct for IRELATIVE relocs.
1319 // For incremental updates, find an available slot.
1320 plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1321 this->get_plt_entry_size(), 0);
1322 if (plt_offset == -1)
1323 gold_fallback(_("out of patch space (PLT);"
1324 " relink with --incremental-full"));
1326 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1327 // can be calculated from the PLT index, adjusting for the three
1328 // reserved entries at the beginning of the GOT.
1329 plt_index = plt_offset / this->get_plt_entry_size() - 1;
1330 got_offset = (plt_index - offset + reserved) * 8;
1333 gsym->set_plt_offset(plt_offset);
1335 // Every PLT entry needs a reloc.
1336 this->add_relocation(symtab, layout, gsym, got_offset);
1338 // Note that we don't need to save the symbol. The contents of the
1339 // PLT are independent of which symbols are used. The symbols only
1340 // appear in the relocations.
1343 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1348 Output_data_plt_x86_64<size>::add_local_ifunc_entry(
1349 Symbol_table* symtab,
1351 Sized_relobj_file<size, false>* relobj,
1352 unsigned int local_sym_index)
1354 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
1355 ++this->irelative_count_;
1357 section_offset_type got_offset = this->got_irelative_->current_data_size();
1359 // Every PLT entry needs a GOT entry which points back to the PLT
1361 this->got_irelative_->set_current_data_size(got_offset + 8);
1363 // Every PLT entry needs a reloc.
1364 Reloc_section* rela = this->rela_irelative(symtab, layout);
1365 rela->add_symbolless_local_addend(relobj, local_sym_index,
1366 elfcpp::R_X86_64_IRELATIVE,
1367 this->got_irelative_, got_offset, 0);
1372 // Add the relocation for a PLT entry.
1376 Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1379 unsigned int got_offset)
1381 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1382 && gsym->can_use_relative_reloc(false))
1384 Reloc_section* rela = this->rela_irelative(symtab, layout);
1385 rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1386 this->got_irelative_, got_offset, 0);
1390 gsym->set_needs_dynsym_entry();
1391 this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1396 // Return where the TLSDESC relocations should go, creating it if
1397 // necessary. These follow the JUMP_SLOT relocations.
1400 typename Output_data_plt_x86_64<size>::Reloc_section*
1401 Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
1403 if (this->tlsdesc_rel_ == NULL)
1405 this->tlsdesc_rel_ = new Reloc_section(false);
1406 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1407 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
1408 ORDER_DYNAMIC_PLT_RELOCS, false);
1409 gold_assert(this->tlsdesc_rel_->output_section()
1410 == this->rel_->output_section());
1412 return this->tlsdesc_rel_;
1415 // Return where the IRELATIVE relocations should go in the PLT. These
1416 // follow the JUMP_SLOT and the TLSDESC relocations.
1419 typename Output_data_plt_x86_64<size>::Reloc_section*
1420 Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1423 if (this->irelative_rel_ == NULL)
1425 // Make sure we have a place for the TLSDESC relocations, in
1426 // case we see any later on.
1427 this->rela_tlsdesc(layout);
1428 this->irelative_rel_ = new Reloc_section(false);
1429 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1430 elfcpp::SHF_ALLOC, this->irelative_rel_,
1431 ORDER_DYNAMIC_PLT_RELOCS, false);
1432 gold_assert(this->irelative_rel_->output_section()
1433 == this->rel_->output_section());
1435 if (parameters->doing_static_link())
1437 // A statically linked executable will only have a .rela.plt
1438 // section to hold R_X86_64_IRELATIVE relocs for
1439 // STT_GNU_IFUNC symbols. The library will use these
1440 // symbols to locate the IRELATIVE relocs at program startup
1442 symtab->define_in_output_data("__rela_iplt_start", NULL,
1443 Symbol_table::PREDEFINED,
1444 this->irelative_rel_, 0, 0,
1445 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1446 elfcpp::STV_HIDDEN, 0, false, true);
1447 symtab->define_in_output_data("__rela_iplt_end", NULL,
1448 Symbol_table::PREDEFINED,
1449 this->irelative_rel_, 0, 0,
1450 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1451 elfcpp::STV_HIDDEN, 0, true, true);
1454 return this->irelative_rel_;
1457 // Return the PLT address to use for a global symbol.
1461 Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym)
1463 uint64_t offset = 0;
1464 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1465 && gsym->can_use_relative_reloc(false))
1466 offset = (this->count_ + 1) * this->get_plt_entry_size();
1467 return this->address() + offset + gsym->plt_offset();
1470 // Return the PLT address to use for a local symbol. These are always
1471 // IRELATIVE relocs.
1475 Output_data_plt_x86_64<size>::address_for_local(const Relobj* object,
1478 return (this->address()
1479 + (this->count_ + 1) * this->get_plt_entry_size()
1480 + object->local_plt_offset(r_sym));
1483 // Set the final size.
1486 Output_data_plt_x86_64<size>::set_final_data_size()
1488 unsigned int count = this->count_ + this->irelative_count_;
1489 if (this->has_tlsdesc_entry())
1491 this->set_data_size((count + 1) * this->get_plt_entry_size());
1494 // The first entry in the PLT for an executable.
1498 Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
1500 // From AMD64 ABI Draft 0.98, page 76
1501 0xff, 0x35, // pushq contents of memory address
1502 0, 0, 0, 0, // replaced with address of .got + 8
1503 0xff, 0x25, // jmp indirect
1504 0, 0, 0, 0, // replaced with address of .got + 16
1505 0x90, 0x90, 0x90, 0x90 // noop (x4)
1510 Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1512 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1513 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1515 memcpy(pov, first_plt_entry, plt_entry_size);
1516 // We do a jmp relative to the PC at the end of this instruction.
1517 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1519 - (plt_address + 6)));
1520 elfcpp::Swap<32, false>::writeval(pov + 8,
1522 - (plt_address + 12)));
1525 // Subsequent entries in the PLT for an executable.
1529 Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
1531 // From AMD64 ABI Draft 0.98, page 76
1532 0xff, 0x25, // jmpq indirect
1533 0, 0, 0, 0, // replaced with address of symbol in .got
1534 0x68, // pushq immediate
1535 0, 0, 0, 0, // replaced with offset into relocation table
1536 0xe9, // jmpq relative
1537 0, 0, 0, 0 // replaced with offset to start of .plt
1542 Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
1544 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1545 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1546 unsigned int got_offset,
1547 unsigned int plt_offset,
1548 unsigned int plt_index)
1550 // Check PC-relative offset overflow in PLT entry.
1551 uint64_t plt_got_pcrel_offset = (got_address + got_offset
1552 - (plt_address + plt_offset + 6));
1553 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
1554 gold_error(_("PC-relative offset overflow in PLT entry %d"),
1557 memcpy(pov, plt_entry, plt_entry_size);
1558 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1559 plt_got_pcrel_offset);
1561 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
1562 elfcpp::Swap<32, false>::writeval(pov + 12,
1563 - (plt_offset + plt_entry_size));
1568 // The reserved TLSDESC entry in the PLT for an executable.
1572 Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
1574 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1575 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1576 0xff, 0x35, // pushq x(%rip)
1577 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1578 0xff, 0x25, // jmpq *y(%rip)
1579 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
1586 Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
1588 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1589 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1590 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
1591 unsigned int tlsdesc_got_offset,
1592 unsigned int plt_offset)
1594 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
1595 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1597 - (plt_address + plt_offset
1599 elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
1601 + tlsdesc_got_offset
1602 - (plt_address + plt_offset
1606 // The .eh_frame unwind information for the PLT.
1610 Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
1613 'z', // Augmentation: augmentation size included.
1614 'R', // Augmentation: FDE encoding included.
1615 '\0', // End of augmentation string.
1616 1, // Code alignment factor.
1617 0x78, // Data alignment factor.
1618 16, // Return address column.
1619 1, // Augmentation size.
1620 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
1621 | elfcpp::DW_EH_PE_sdata4),
1622 elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1623 elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1624 elfcpp::DW_CFA_nop, // Align to 16 bytes.
1630 Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
1632 0, 0, 0, 0, // Replaced with offset to .plt.
1633 0, 0, 0, 0, // Replaced with size of .plt.
1634 0, // Augmentation size.
1635 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
1636 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
1637 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
1638 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
1639 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
1640 11, // Block length.
1641 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
1642 elfcpp::DW_OP_breg16, 0, // Push %rip.
1643 elfcpp::DW_OP_lit15, // Push 0xf.
1644 elfcpp::DW_OP_and, // & (%rip & 0xf).
1645 elfcpp::DW_OP_lit11, // Push 0xb.
1646 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
1647 elfcpp::DW_OP_lit3, // Push 3.
1648 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
1649 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1650 elfcpp::DW_CFA_nop, // Align to 32 bytes.
1656 // Write out the PLT. This uses the hand-coded instructions above,
1657 // and adjusts them as needed. This is specified by the AMD64 ABI.
1661 Output_data_plt_x86_64<size>::do_write(Output_file* of)
1663 const off_t offset = this->offset();
1664 const section_size_type oview_size =
1665 convert_to_section_size_type(this->data_size());
1666 unsigned char* const oview = of->get_output_view(offset, oview_size);
1668 const off_t got_file_offset = this->got_plt_->offset();
1669 gold_assert(parameters->incremental_update()
1670 || (got_file_offset + this->got_plt_->data_size()
1671 == this->got_irelative_->offset()));
1672 const section_size_type got_size =
1673 convert_to_section_size_type(this->got_plt_->data_size()
1674 + this->got_irelative_->data_size());
1675 unsigned char* const got_view = of->get_output_view(got_file_offset,
1678 unsigned char* pov = oview;
1680 // The base address of the .plt section.
1681 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
1682 // The base address of the .got section.
1683 typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
1684 // The base address of the PLT portion of the .got section,
1685 // which is where the GOT pointer will point, and where the
1686 // three reserved GOT entries are located.
1687 typename elfcpp::Elf_types<size>::Elf_Addr got_address
1688 = this->got_plt_->address();
1690 this->fill_first_plt_entry(pov, got_address, plt_address);
1691 pov += this->get_plt_entry_size();
1693 // The first three entries in the GOT are reserved, and are written
1694 // by Output_data_got_plt_x86_64::do_write.
1695 unsigned char* got_pov = got_view + 24;
1697 unsigned int plt_offset = this->get_plt_entry_size();
1698 unsigned int got_offset = 24;
1699 const unsigned int count = this->count_ + this->irelative_count_;
1700 for (unsigned int plt_index = 0;
1703 pov += this->get_plt_entry_size(),
1705 plt_offset += this->get_plt_entry_size(),
1708 // Set and adjust the PLT entry itself.
1709 unsigned int lazy_offset = this->fill_plt_entry(pov,
1710 got_address, plt_address,
1711 got_offset, plt_offset,
1714 // Set the entry in the GOT.
1715 elfcpp::Swap<64, false>::writeval(got_pov,
1716 plt_address + plt_offset + lazy_offset);
1719 if (this->has_tlsdesc_entry())
1721 // Set and adjust the reserved TLSDESC PLT entry.
1722 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
1723 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
1724 tlsdesc_got_offset, plt_offset);
1725 pov += this->get_plt_entry_size();
1728 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1729 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
1731 of->write_output_view(offset, oview_size, oview);
1732 of->write_output_view(got_file_offset, got_size, got_view);
1735 // Create the PLT section.
1739 Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
1741 if (this->plt_ == NULL)
1743 // Create the GOT sections first.
1744 this->got_section(symtab, layout);
1746 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
1747 this->got_irelative_);
1749 // Add unwind information if requested.
1750 if (parameters->options().ld_generated_unwind_info())
1751 this->plt_->add_eh_frame(layout);
1753 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1755 | elfcpp::SHF_EXECINSTR),
1756 this->plt_, ORDER_PLT, false);
1758 // Make the sh_info field of .rela.plt point to .plt.
1759 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1760 rela_plt_os->set_info_section(this->plt_->output_section());
1764 // Return the section for TLSDESC relocations.
1767 typename Target_x86_64<size>::Reloc_section*
1768 Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
1770 return this->plt_section()->rela_tlsdesc(layout);
1773 // Create a PLT entry for a global symbol.
1777 Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
1780 if (gsym->has_plt_offset())
1783 if (this->plt_ == NULL)
1784 this->make_plt_section(symtab, layout);
1786 this->plt_->add_entry(symtab, layout, gsym);
1789 // Make a PLT entry for a local STT_GNU_IFUNC symbol.
1793 Target_x86_64<size>::make_local_ifunc_plt_entry(
1794 Symbol_table* symtab, Layout* layout,
1795 Sized_relobj_file<size, false>* relobj,
1796 unsigned int local_sym_index)
1798 if (relobj->local_has_plt_offset(local_sym_index))
1800 if (this->plt_ == NULL)
1801 this->make_plt_section(symtab, layout);
1802 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
1805 relobj->set_local_plt_offset(local_sym_index, plt_offset);
1808 // Return the number of entries in the PLT.
1812 Target_x86_64<size>::plt_entry_count() const
1814 if (this->plt_ == NULL)
1816 return this->plt_->entry_count();
1819 // Return the offset of the first non-reserved PLT entry.
1823 Target_x86_64<size>::first_plt_entry_offset() const
1825 if (this->plt_ == NULL)
1827 return this->plt_->first_plt_entry_offset();
1830 // Return the size of each PLT entry.
1834 Target_x86_64<size>::plt_entry_size() const
1836 if (this->plt_ == NULL)
1838 return this->plt_->get_plt_entry_size();
1841 // Create the GOT and PLT sections for an incremental update.
1844 Output_data_got_base*
1845 Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
1847 unsigned int got_count,
1848 unsigned int plt_count)
1850 gold_assert(this->got_ == NULL);
1852 this->got_ = new Output_data_got<64, false>(got_count * 8);
1853 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1855 | elfcpp::SHF_WRITE),
1856 this->got_, ORDER_RELRO_LAST,
1859 // Add the three reserved entries.
1860 this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
1861 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1863 | elfcpp::SHF_WRITE),
1864 this->got_plt_, ORDER_NON_RELRO_FIRST,
1867 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1868 this->global_offset_table_ =
1869 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1870 Symbol_table::PREDEFINED,
1872 0, 0, elfcpp::STT_OBJECT,
1874 elfcpp::STV_HIDDEN, 0,
1877 // If there are any TLSDESC relocations, they get GOT entries in
1878 // .got.plt after the jump slot entries.
1879 // FIXME: Get the count for TLSDESC entries.
1880 this->got_tlsdesc_ = new Output_data_got<64, false>(0);
1881 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1882 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1884 ORDER_NON_RELRO_FIRST, false);
1886 // If there are any IRELATIVE relocations, they get GOT entries in
1887 // .got.plt after the jump slot and TLSDESC entries.
1888 this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1889 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1890 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1891 this->got_irelative_,
1892 ORDER_NON_RELRO_FIRST, false);
1894 // Create the PLT section.
1895 this->plt_ = this->make_data_plt(layout, this->got_,
1897 this->got_irelative_,
1900 // Add unwind information if requested.
1901 if (parameters->options().ld_generated_unwind_info())
1902 this->plt_->add_eh_frame(layout);
1904 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1905 elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
1906 this->plt_, ORDER_PLT, false);
1908 // Make the sh_info field of .rela.plt point to .plt.
1909 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1910 rela_plt_os->set_info_section(this->plt_->output_section());
1912 // Create the rela_dyn section.
1913 this->rela_dyn_section(layout);
1918 // Reserve a GOT entry for a local symbol, and regenerate any
1919 // necessary dynamic relocations.
1923 Target_x86_64<size>::reserve_local_got_entry(
1924 unsigned int got_index,
1925 Sized_relobj<size, false>* obj,
1927 unsigned int got_type)
1929 unsigned int got_offset = got_index * 8;
1930 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1932 this->got_->reserve_local(got_index, obj, r_sym, got_type);
1935 case GOT_TYPE_STANDARD:
1936 if (parameters->options().output_is_position_independent())
1937 rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
1938 this->got_, got_offset, 0, false);
1940 case GOT_TYPE_TLS_OFFSET:
1941 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
1942 this->got_, got_offset, 0);
1944 case GOT_TYPE_TLS_PAIR:
1945 this->got_->reserve_slot(got_index + 1);
1946 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
1947 this->got_, got_offset, 0);
1949 case GOT_TYPE_TLS_DESC:
1950 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
1951 // this->got_->reserve_slot(got_index + 1);
1952 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
1953 // this->got_, got_offset, 0);
1960 // Reserve a GOT entry for a global symbol, and regenerate any
1961 // necessary dynamic relocations.
1965 Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
1967 unsigned int got_type)
1969 unsigned int got_offset = got_index * 8;
1970 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1972 this->got_->reserve_global(got_index, gsym, got_type);
1975 case GOT_TYPE_STANDARD:
1976 if (!gsym->final_value_is_known())
1978 if (gsym->is_from_dynobj()
1979 || gsym->is_undefined()
1980 || gsym->is_preemptible()
1981 || gsym->type() == elfcpp::STT_GNU_IFUNC)
1982 rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
1983 this->got_, got_offset, 0);
1985 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
1986 this->got_, got_offset, 0, false);
1989 case GOT_TYPE_TLS_OFFSET:
1990 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
1991 this->got_, got_offset, 0, false);
1993 case GOT_TYPE_TLS_PAIR:
1994 this->got_->reserve_slot(got_index + 1);
1995 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
1996 this->got_, got_offset, 0, false);
1997 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
1998 this->got_, got_offset + 8, 0, false);
2000 case GOT_TYPE_TLS_DESC:
2001 this->got_->reserve_slot(got_index + 1);
2002 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
2003 this->got_, got_offset, 0, false);
2010 // Register an existing PLT entry for a global symbol.
2014 Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
2016 unsigned int plt_index,
2019 gold_assert(this->plt_ != NULL);
2020 gold_assert(!gsym->has_plt_offset());
2022 this->plt_->reserve_slot(plt_index);
2024 gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
2026 unsigned int got_offset = (plt_index + 3) * 8;
2027 this->plt_->add_relocation(symtab, layout, gsym, got_offset);
2030 // Force a COPY relocation for a given symbol.
2034 Target_x86_64<size>::emit_copy_reloc(
2035 Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
2037 this->copy_relocs_.emit_copy_reloc(symtab,
2038 symtab->get_sized_symbol<size>(sym),
2041 this->rela_dyn_section(NULL));
2044 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
2048 Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
2051 if (this->tls_base_symbol_defined_)
2054 Output_segment* tls_segment = layout->tls_segment();
2055 if (tls_segment != NULL)
2057 bool is_exec = parameters->options().output_is_executable();
2058 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
2059 Symbol_table::PREDEFINED,
2063 elfcpp::STV_HIDDEN, 0,
2065 ? Symbol::SEGMENT_END
2066 : Symbol::SEGMENT_START),
2069 this->tls_base_symbol_defined_ = true;
2072 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
2076 Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2079 if (this->plt_ == NULL)
2080 this->make_plt_section(symtab, layout);
2082 if (!this->plt_->has_tlsdesc_entry())
2084 // Allocate the TLSDESC_GOT entry.
2085 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2086 unsigned int got_offset = got->add_constant(0);
2088 // Allocate the TLSDESC_PLT entry.
2089 this->plt_->reserve_tlsdesc_entry(got_offset);
2093 // Create a GOT entry for the TLS module index.
2097 Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2098 Sized_relobj_file<size, false>* object)
2100 if (this->got_mod_index_offset_ == -1U)
2102 gold_assert(symtab != NULL && layout != NULL && object != NULL);
2103 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
2104 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2105 unsigned int got_offset = got->add_constant(0);
2106 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2108 got->add_constant(0);
2109 this->got_mod_index_offset_ = got_offset;
2111 return this->got_mod_index_offset_;
2114 // Optimize the TLS relocation type based on what we know about the
2115 // symbol. IS_FINAL is true if the final address of this symbol is
2116 // known at link time.
2119 tls::Tls_optimization
2120 Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2122 // If we are generating a shared library, then we can't do anything
2124 if (parameters->options().shared())
2125 return tls::TLSOPT_NONE;
2129 case elfcpp::R_X86_64_TLSGD:
2130 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2131 case elfcpp::R_X86_64_TLSDESC_CALL:
2132 // These are General-Dynamic which permits fully general TLS
2133 // access. Since we know that we are generating an executable,
2134 // we can convert this to Initial-Exec. If we also know that
2135 // this is a local symbol, we can further switch to Local-Exec.
2137 return tls::TLSOPT_TO_LE;
2138 return tls::TLSOPT_TO_IE;
2140 case elfcpp::R_X86_64_TLSLD:
2141 // This is Local-Dynamic, which refers to a local symbol in the
2142 // dynamic TLS block. Since we know that we generating an
2143 // executable, we can switch to Local-Exec.
2144 return tls::TLSOPT_TO_LE;
2146 case elfcpp::R_X86_64_DTPOFF32:
2147 case elfcpp::R_X86_64_DTPOFF64:
2148 // Another Local-Dynamic reloc.
2149 return tls::TLSOPT_TO_LE;
2151 case elfcpp::R_X86_64_GOTTPOFF:
2152 // These are Initial-Exec relocs which get the thread offset
2153 // from the GOT. If we know that we are linking against the
2154 // local symbol, we can switch to Local-Exec, which links the
2155 // thread offset into the instruction.
2157 return tls::TLSOPT_TO_LE;
2158 return tls::TLSOPT_NONE;
2160 case elfcpp::R_X86_64_TPOFF32:
2161 // When we already have Local-Exec, there is nothing further we
2163 return tls::TLSOPT_NONE;
2170 // Get the Reference_flags for a particular relocation.
2174 Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
2178 case elfcpp::R_X86_64_NONE:
2179 case elfcpp::R_X86_64_GNU_VTINHERIT:
2180 case elfcpp::R_X86_64_GNU_VTENTRY:
2181 case elfcpp::R_X86_64_GOTPC32:
2182 case elfcpp::R_X86_64_GOTPC64:
2183 // No symbol reference.
2186 case elfcpp::R_X86_64_64:
2187 case elfcpp::R_X86_64_32:
2188 case elfcpp::R_X86_64_32S:
2189 case elfcpp::R_X86_64_16:
2190 case elfcpp::R_X86_64_8:
2191 return Symbol::ABSOLUTE_REF;
2193 case elfcpp::R_X86_64_PC64:
2194 case elfcpp::R_X86_64_PC32:
2195 case elfcpp::R_X86_64_PC32_BND:
2196 case elfcpp::R_X86_64_PC16:
2197 case elfcpp::R_X86_64_PC8:
2198 case elfcpp::R_X86_64_GOTOFF64:
2199 return Symbol::RELATIVE_REF;
2201 case elfcpp::R_X86_64_PLT32:
2202 case elfcpp::R_X86_64_PLT32_BND:
2203 case elfcpp::R_X86_64_PLTOFF64:
2204 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
2206 case elfcpp::R_X86_64_GOT64:
2207 case elfcpp::R_X86_64_GOT32:
2208 case elfcpp::R_X86_64_GOTPCREL64:
2209 case elfcpp::R_X86_64_GOTPCREL:
2210 case elfcpp::R_X86_64_GOTPCRELX:
2211 case elfcpp::R_X86_64_REX_GOTPCRELX:
2212 case elfcpp::R_X86_64_GOTPLT64:
2214 return Symbol::ABSOLUTE_REF;
2216 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2217 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2218 case elfcpp::R_X86_64_TLSDESC_CALL:
2219 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2220 case elfcpp::R_X86_64_DTPOFF32:
2221 case elfcpp::R_X86_64_DTPOFF64:
2222 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2223 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2224 return Symbol::TLS_REF;
2226 case elfcpp::R_X86_64_COPY:
2227 case elfcpp::R_X86_64_GLOB_DAT:
2228 case elfcpp::R_X86_64_JUMP_SLOT:
2229 case elfcpp::R_X86_64_RELATIVE:
2230 case elfcpp::R_X86_64_IRELATIVE:
2231 case elfcpp::R_X86_64_TPOFF64:
2232 case elfcpp::R_X86_64_DTPMOD64:
2233 case elfcpp::R_X86_64_TLSDESC:
2234 case elfcpp::R_X86_64_SIZE32:
2235 case elfcpp::R_X86_64_SIZE64:
2237 // Not expected. We will give an error later.
2242 // Report an unsupported relocation against a local symbol.
2246 Target_x86_64<size>::Scan::unsupported_reloc_local(
2247 Sized_relobj_file<size, false>* object,
2248 unsigned int r_type)
2250 gold_error(_("%s: unsupported reloc %u against local symbol"),
2251 object->name().c_str(), r_type);
2254 // We are about to emit a dynamic relocation of type R_TYPE. If the
2255 // dynamic linker does not support it, issue an error. The GNU linker
2256 // only issues a non-PIC error for an allocated read-only section.
2257 // Here we know the section is allocated, but we don't know that it is
2258 // read-only. But we check for all the relocation types which the
2259 // glibc dynamic linker supports, so it seems appropriate to issue an
2260 // error even if the section is not read-only. If GSYM is not NULL,
2261 // it is the symbol the relocation is against; if it is NULL, the
2262 // relocation is against a local symbol.
2266 Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
2271 // These are the relocation types supported by glibc for x86_64
2272 // which should always work.
2273 case elfcpp::R_X86_64_RELATIVE:
2274 case elfcpp::R_X86_64_IRELATIVE:
2275 case elfcpp::R_X86_64_GLOB_DAT:
2276 case elfcpp::R_X86_64_JUMP_SLOT:
2277 case elfcpp::R_X86_64_DTPMOD64:
2278 case elfcpp::R_X86_64_DTPOFF64:
2279 case elfcpp::R_X86_64_TPOFF64:
2280 case elfcpp::R_X86_64_64:
2281 case elfcpp::R_X86_64_COPY:
2284 // glibc supports these reloc types, but they can overflow.
2285 case elfcpp::R_X86_64_PC32:
2286 case elfcpp::R_X86_64_PC32_BND:
2287 // A PC relative reference is OK against a local symbol or if
2288 // the symbol is defined locally.
2290 || (!gsym->is_from_dynobj()
2291 && !gsym->is_undefined()
2292 && !gsym->is_preemptible()))
2295 case elfcpp::R_X86_64_32:
2296 // R_X86_64_32 is OK for x32.
2297 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2299 if (this->issued_non_pic_error_)
2301 gold_assert(parameters->options().output_is_position_independent());
2303 object->error(_("requires dynamic R_X86_64_32 reloc which may "
2304 "overflow at runtime; recompile with -fPIC"));
2310 case elfcpp::R_X86_64_32:
2311 r_name = "R_X86_64_32";
2313 case elfcpp::R_X86_64_PC32:
2314 r_name = "R_X86_64_PC32";
2316 case elfcpp::R_X86_64_PC32_BND:
2317 r_name = "R_X86_64_PC32_BND";
2323 object->error(_("requires dynamic %s reloc against '%s' "
2324 "which may overflow at runtime; recompile "
2326 r_name, gsym->name());
2328 this->issued_non_pic_error_ = true;
2332 // This prevents us from issuing more than one error per reloc
2333 // section. But we can still wind up issuing more than one
2334 // error per object file.
2335 if (this->issued_non_pic_error_)
2337 gold_assert(parameters->options().output_is_position_independent());
2338 object->error(_("requires unsupported dynamic reloc %u; "
2339 "recompile with -fPIC"),
2341 this->issued_non_pic_error_ = true;
2344 case elfcpp::R_X86_64_NONE:
2349 // Return whether we need to make a PLT entry for a relocation of the
2350 // given type against a STT_GNU_IFUNC symbol.
2354 Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
2355 Sized_relobj_file<size, false>* object,
2356 unsigned int r_type)
2358 int flags = Scan::get_reference_flags(r_type);
2359 if (flags & Symbol::TLS_REF)
2360 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2361 object->name().c_str(), r_type);
2365 // Scan a relocation for a local symbol.
2369 Target_x86_64<size>::Scan::local(Symbol_table* symtab,
2371 Target_x86_64<size>* target,
2372 Sized_relobj_file<size, false>* object,
2373 unsigned int data_shndx,
2374 Output_section* output_section,
2375 const elfcpp::Rela<size, false>& reloc,
2376 unsigned int r_type,
2377 const elfcpp::Sym<size, false>& lsym,
2383 // A local STT_GNU_IFUNC symbol may require a PLT entry.
2384 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
2385 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
2387 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2388 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
2393 case elfcpp::R_X86_64_NONE:
2394 case elfcpp::R_X86_64_GNU_VTINHERIT:
2395 case elfcpp::R_X86_64_GNU_VTENTRY:
2398 case elfcpp::R_X86_64_64:
2399 // If building a shared library (or a position-independent
2400 // executable), we need to create a dynamic relocation for this
2401 // location. The relocation applied at link time will apply the
2402 // link-time value, so we flag the location with an
2403 // R_X86_64_RELATIVE relocation so the dynamic loader can
2404 // relocate it easily.
2405 if (parameters->options().output_is_position_independent())
2407 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2408 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2409 rela_dyn->add_local_relative(object, r_sym,
2411 ? elfcpp::R_X86_64_RELATIVE64
2412 : elfcpp::R_X86_64_RELATIVE),
2413 output_section, data_shndx,
2414 reloc.get_r_offset(),
2415 reloc.get_r_addend(), is_ifunc);
2419 case elfcpp::R_X86_64_32:
2420 case elfcpp::R_X86_64_32S:
2421 case elfcpp::R_X86_64_16:
2422 case elfcpp::R_X86_64_8:
2423 // If building a shared library (or a position-independent
2424 // executable), we need to create a dynamic relocation for this
2425 // location. We can't use an R_X86_64_RELATIVE relocation
2426 // because that is always a 64-bit relocation.
2427 if (parameters->options().output_is_position_independent())
2429 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2430 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2432 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2433 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2434 rela_dyn->add_local_relative(object, r_sym,
2435 elfcpp::R_X86_64_RELATIVE,
2436 output_section, data_shndx,
2437 reloc.get_r_offset(),
2438 reloc.get_r_addend(), is_ifunc);
2442 this->check_non_pic(object, r_type, NULL);
2444 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2445 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2446 if (lsym.get_st_type() != elfcpp::STT_SECTION)
2447 rela_dyn->add_local(object, r_sym, r_type, output_section,
2448 data_shndx, reloc.get_r_offset(),
2449 reloc.get_r_addend());
2452 gold_assert(lsym.get_st_value() == 0);
2453 unsigned int shndx = lsym.get_st_shndx();
2455 shndx = object->adjust_sym_shndx(r_sym, shndx,
2458 object->error(_("section symbol %u has bad shndx %u"),
2461 rela_dyn->add_local_section(object, shndx,
2462 r_type, output_section,
2463 data_shndx, reloc.get_r_offset(),
2464 reloc.get_r_addend());
2469 case elfcpp::R_X86_64_PC64:
2470 case elfcpp::R_X86_64_PC32:
2471 case elfcpp::R_X86_64_PC32_BND:
2472 case elfcpp::R_X86_64_PC16:
2473 case elfcpp::R_X86_64_PC8:
2476 case elfcpp::R_X86_64_PLT32:
2477 case elfcpp::R_X86_64_PLT32_BND:
2478 // Since we know this is a local symbol, we can handle this as a
2482 case elfcpp::R_X86_64_GOTPC32:
2483 case elfcpp::R_X86_64_GOTOFF64:
2484 case elfcpp::R_X86_64_GOTPC64:
2485 case elfcpp::R_X86_64_PLTOFF64:
2486 // We need a GOT section.
2487 target->got_section(symtab, layout);
2488 // For PLTOFF64, we'd normally want a PLT section, but since we
2489 // know this is a local symbol, no PLT is needed.
2492 case elfcpp::R_X86_64_GOT64:
2493 case elfcpp::R_X86_64_GOT32:
2494 case elfcpp::R_X86_64_GOTPCREL64:
2495 case elfcpp::R_X86_64_GOTPCREL:
2496 case elfcpp::R_X86_64_GOTPCRELX:
2497 case elfcpp::R_X86_64_REX_GOTPCRELX:
2498 case elfcpp::R_X86_64_GOTPLT64:
2500 // The symbol requires a GOT section.
2501 Output_data_got<64, false>* got = target->got_section(symtab, layout);
2503 // If the relocation symbol isn't IFUNC,
2504 // and is local, then we will convert
2505 // mov foo@GOTPCREL(%rip), %reg
2506 // to lea foo(%rip), %reg.
2507 // in Relocate::relocate.
2508 if ((r_type == elfcpp::R_X86_64_GOTPCREL
2509 || r_type == elfcpp::R_X86_64_GOTPCRELX
2510 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
2511 && reloc.get_r_offset() >= 2
2514 section_size_type stype;
2515 const unsigned char* view = object->section_contents(data_shndx,
2517 if (view[reloc.get_r_offset() - 2] == 0x8b)
2522 // The symbol requires a GOT entry.
2523 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2525 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
2526 // lets function pointers compare correctly with shared
2527 // libraries. Otherwise we would need an IRELATIVE reloc.
2530 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
2532 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2535 // If we are generating a shared object, we need to add a
2536 // dynamic relocation for this symbol's GOT entry.
2537 if (parameters->options().output_is_position_independent())
2539 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2540 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2541 if (r_type != elfcpp::R_X86_64_GOT32)
2543 unsigned int got_offset =
2544 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
2545 rela_dyn->add_local_relative(object, r_sym,
2546 elfcpp::R_X86_64_RELATIVE,
2547 got, got_offset, 0, is_ifunc);
2551 this->check_non_pic(object, r_type, NULL);
2553 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
2554 rela_dyn->add_local(
2555 object, r_sym, r_type, got,
2556 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
2560 // For GOTPLT64, we'd normally want a PLT section, but since
2561 // we know this is a local symbol, no PLT is needed.
2565 case elfcpp::R_X86_64_COPY:
2566 case elfcpp::R_X86_64_GLOB_DAT:
2567 case elfcpp::R_X86_64_JUMP_SLOT:
2568 case elfcpp::R_X86_64_RELATIVE:
2569 case elfcpp::R_X86_64_IRELATIVE:
2570 // These are outstanding tls relocs, which are unexpected when linking
2571 case elfcpp::R_X86_64_TPOFF64:
2572 case elfcpp::R_X86_64_DTPMOD64:
2573 case elfcpp::R_X86_64_TLSDESC:
2574 gold_error(_("%s: unexpected reloc %u in object file"),
2575 object->name().c_str(), r_type);
2578 // These are initial tls relocs, which are expected when linking
2579 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2580 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2581 case elfcpp::R_X86_64_TLSDESC_CALL:
2582 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2583 case elfcpp::R_X86_64_DTPOFF32:
2584 case elfcpp::R_X86_64_DTPOFF64:
2585 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2586 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2588 bool output_is_shared = parameters->options().shared();
2589 const tls::Tls_optimization optimized_type
2590 = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
2594 case elfcpp::R_X86_64_TLSGD: // General-dynamic
2595 if (optimized_type == tls::TLSOPT_NONE)
2597 // Create a pair of GOT entries for the module index and
2598 // dtv-relative offset.
2599 Output_data_got<64, false>* got
2600 = target->got_section(symtab, layout);
2601 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2602 unsigned int shndx = lsym.get_st_shndx();
2604 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
2606 object->error(_("local symbol %u has bad shndx %u"),
2609 got->add_local_pair_with_rel(object, r_sym,
2612 target->rela_dyn_section(layout),
2613 elfcpp::R_X86_64_DTPMOD64);
2615 else if (optimized_type != tls::TLSOPT_TO_LE)
2616 unsupported_reloc_local(object, r_type);
2619 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2620 target->define_tls_base_symbol(symtab, layout);
2621 if (optimized_type == tls::TLSOPT_NONE)
2623 // Create reserved PLT and GOT entries for the resolver.
2624 target->reserve_tlsdesc_entries(symtab, layout);
2626 // Generate a double GOT entry with an
2627 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
2628 // is resolved lazily, so the GOT entry needs to be in
2629 // an area in .got.plt, not .got. Call got_section to
2630 // make sure the section has been created.
2631 target->got_section(symtab, layout);
2632 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2633 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2634 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
2636 unsigned int got_offset = got->add_constant(0);
2637 got->add_constant(0);
2638 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
2640 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2641 // We store the arguments we need in a vector, and
2642 // use the index into the vector as the parameter
2643 // to pass to the target specific routines.
2644 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
2645 void* arg = reinterpret_cast<void*>(intarg);
2646 rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2647 got, got_offset, 0);
2650 else if (optimized_type != tls::TLSOPT_TO_LE)
2651 unsupported_reloc_local(object, r_type);
2654 case elfcpp::R_X86_64_TLSDESC_CALL:
2657 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2658 if (optimized_type == tls::TLSOPT_NONE)
2660 // Create a GOT entry for the module index.
2661 target->got_mod_index_entry(symtab, layout, object);
2663 else if (optimized_type != tls::TLSOPT_TO_LE)
2664 unsupported_reloc_local(object, r_type);
2667 case elfcpp::R_X86_64_DTPOFF32:
2668 case elfcpp::R_X86_64_DTPOFF64:
2671 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2672 layout->set_has_static_tls();
2673 if (optimized_type == tls::TLSOPT_NONE)
2675 // Create a GOT entry for the tp-relative offset.
2676 Output_data_got<64, false>* got
2677 = target->got_section(symtab, layout);
2678 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2679 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
2680 target->rela_dyn_section(layout),
2681 elfcpp::R_X86_64_TPOFF64);
2683 else if (optimized_type != tls::TLSOPT_TO_LE)
2684 unsupported_reloc_local(object, r_type);
2687 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2688 layout->set_has_static_tls();
2689 if (output_is_shared)
2690 unsupported_reloc_local(object, r_type);
2699 case elfcpp::R_X86_64_SIZE32:
2700 case elfcpp::R_X86_64_SIZE64:
2702 gold_error(_("%s: unsupported reloc %u against local symbol"),
2703 object->name().c_str(), r_type);
2709 // Report an unsupported relocation against a global symbol.
2713 Target_x86_64<size>::Scan::unsupported_reloc_global(
2714 Sized_relobj_file<size, false>* object,
2715 unsigned int r_type,
2718 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
2719 object->name().c_str(), r_type, gsym->demangled_name().c_str());
2722 // Returns true if this relocation type could be that of a function pointer.
2725 Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
2729 case elfcpp::R_X86_64_64:
2730 case elfcpp::R_X86_64_32:
2731 case elfcpp::R_X86_64_32S:
2732 case elfcpp::R_X86_64_16:
2733 case elfcpp::R_X86_64_8:
2734 case elfcpp::R_X86_64_GOT64:
2735 case elfcpp::R_X86_64_GOT32:
2736 case elfcpp::R_X86_64_GOTPCREL64:
2737 case elfcpp::R_X86_64_GOTPCREL:
2738 case elfcpp::R_X86_64_GOTPCRELX:
2739 case elfcpp::R_X86_64_REX_GOTPCRELX:
2740 case elfcpp::R_X86_64_GOTPLT64:
2748 // For safe ICF, scan a relocation for a local symbol to check if it
2749 // corresponds to a function pointer being taken. In that case mark
2750 // the function whose pointer was taken as not foldable.
2754 Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
2757 Target_x86_64<size>* ,
2758 Sized_relobj_file<size, false>* ,
2761 const elfcpp::Rela<size, false>& ,
2762 unsigned int r_type,
2763 const elfcpp::Sym<size, false>&)
2765 // When building a shared library, do not fold any local symbols as it is
2766 // not possible to distinguish pointer taken versus a call by looking at
2767 // the relocation types.
2768 return (parameters->options().shared()
2769 || possible_function_pointer_reloc(r_type));
2772 // For safe ICF, scan a relocation for a global symbol to check if it
2773 // corresponds to a function pointer being taken. In that case mark
2774 // the function whose pointer was taken as not foldable.
2778 Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
2781 Target_x86_64<size>* ,
2782 Sized_relobj_file<size, false>* ,
2785 const elfcpp::Rela<size, false>& ,
2786 unsigned int r_type,
2789 // When building a shared library, do not fold symbols whose visibility
2790 // is hidden, internal or protected.
2791 return ((parameters->options().shared()
2792 && (gsym->visibility() == elfcpp::STV_INTERNAL
2793 || gsym->visibility() == elfcpp::STV_PROTECTED
2794 || gsym->visibility() == elfcpp::STV_HIDDEN))
2795 || possible_function_pointer_reloc(r_type));
2798 // Scan a relocation for a global symbol.
2802 Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2804 Target_x86_64<size>* target,
2805 Sized_relobj_file<size, false>* object,
2806 unsigned int data_shndx,
2807 Output_section* output_section,
2808 const elfcpp::Rela<size, false>& reloc,
2809 unsigned int r_type,
2812 // A STT_GNU_IFUNC symbol may require a PLT entry.
2813 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2814 && this->reloc_needs_plt_for_ifunc(object, r_type))
2815 target->make_plt_entry(symtab, layout, gsym);
2819 case elfcpp::R_X86_64_NONE:
2820 case elfcpp::R_X86_64_GNU_VTINHERIT:
2821 case elfcpp::R_X86_64_GNU_VTENTRY:
2824 case elfcpp::R_X86_64_64:
2825 case elfcpp::R_X86_64_32:
2826 case elfcpp::R_X86_64_32S:
2827 case elfcpp::R_X86_64_16:
2828 case elfcpp::R_X86_64_8:
2830 // Make a PLT entry if necessary.
2831 if (gsym->needs_plt_entry())
2833 target->make_plt_entry(symtab, layout, gsym);
2834 // Since this is not a PC-relative relocation, we may be
2835 // taking the address of a function. In that case we need to
2836 // set the entry in the dynamic symbol table to the address of
2838 if (gsym->is_from_dynobj() && !parameters->options().shared())
2839 gsym->set_needs_dynsym_value();
2841 // Make a dynamic relocation if necessary.
2842 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2844 if (!parameters->options().output_is_position_independent()
2845 && gsym->may_need_copy_reloc())
2847 target->copy_reloc(symtab, layout, object,
2848 data_shndx, output_section, gsym, reloc);
2850 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2851 || (size == 32 && r_type == elfcpp::R_X86_64_32))
2852 && gsym->type() == elfcpp::STT_GNU_IFUNC
2853 && gsym->can_use_relative_reloc(false)
2854 && !gsym->is_from_dynobj()
2855 && !gsym->is_undefined()
2856 && !gsym->is_preemptible())
2858 // Use an IRELATIVE reloc for a locally defined
2859 // STT_GNU_IFUNC symbol. This makes a function
2860 // address in a PIE executable match the address in a
2861 // shared library that it links against.
2862 Reloc_section* rela_dyn =
2863 target->rela_irelative_section(layout);
2864 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
2865 rela_dyn->add_symbolless_global_addend(gsym, r_type,
2866 output_section, object,
2868 reloc.get_r_offset(),
2869 reloc.get_r_addend());
2871 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2872 || (size == 32 && r_type == elfcpp::R_X86_64_32))
2873 && gsym->can_use_relative_reloc(false))
2875 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2876 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
2877 output_section, object,
2879 reloc.get_r_offset(),
2880 reloc.get_r_addend(), false);
2884 this->check_non_pic(object, r_type, gsym);
2885 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2886 rela_dyn->add_global(gsym, r_type, output_section, object,
2887 data_shndx, reloc.get_r_offset(),
2888 reloc.get_r_addend());
2894 case elfcpp::R_X86_64_PC64:
2895 case elfcpp::R_X86_64_PC32:
2896 case elfcpp::R_X86_64_PC32_BND:
2897 case elfcpp::R_X86_64_PC16:
2898 case elfcpp::R_X86_64_PC8:
2900 // Make a PLT entry if necessary.
2901 if (gsym->needs_plt_entry())
2902 target->make_plt_entry(symtab, layout, gsym);
2903 // Make a dynamic relocation if necessary.
2904 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2906 if (parameters->options().output_is_executable()
2907 && gsym->may_need_copy_reloc())
2909 target->copy_reloc(symtab, layout, object,
2910 data_shndx, output_section, gsym, reloc);
2914 this->check_non_pic(object, r_type, gsym);
2915 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2916 rela_dyn->add_global(gsym, r_type, output_section, object,
2917 data_shndx, reloc.get_r_offset(),
2918 reloc.get_r_addend());
2924 case elfcpp::R_X86_64_GOT64:
2925 case elfcpp::R_X86_64_GOT32:
2926 case elfcpp::R_X86_64_GOTPCREL64:
2927 case elfcpp::R_X86_64_GOTPCREL:
2928 case elfcpp::R_X86_64_GOTPCRELX:
2929 case elfcpp::R_X86_64_REX_GOTPCRELX:
2930 case elfcpp::R_X86_64_GOTPLT64:
2932 // The symbol requires a GOT entry.
2933 Output_data_got<64, false>* got = target->got_section(symtab, layout);
2935 // If we convert this from
2936 // mov foo@GOTPCREL(%rip), %reg
2937 // to lea foo(%rip), %reg.
2938 // in Relocate::relocate, then there is nothing to do here.
2939 if ((r_type == elfcpp::R_X86_64_GOTPCREL
2940 || r_type == elfcpp::R_X86_64_GOTPCRELX
2941 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
2942 && reloc.get_r_offset() >= 2
2943 && Target_x86_64<size>::can_convert_mov_to_lea(gsym))
2945 section_size_type stype;
2946 const unsigned char* view = object->section_contents(data_shndx,
2948 if (view[reloc.get_r_offset() - 2] == 0x8b)
2952 if (gsym->final_value_is_known())
2954 // For a STT_GNU_IFUNC symbol we want the PLT address.
2955 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
2956 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2958 got->add_global(gsym, GOT_TYPE_STANDARD);
2962 // If this symbol is not fully resolved, we need to add a
2963 // dynamic relocation for it.
2964 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2966 // Use a GLOB_DAT rather than a RELATIVE reloc if:
2968 // 1) The symbol may be defined in some other module.
2970 // 2) We are building a shared library and this is a
2971 // protected symbol; using GLOB_DAT means that the dynamic
2972 // linker can use the address of the PLT in the main
2973 // executable when appropriate so that function address
2974 // comparisons work.
2976 // 3) This is a STT_GNU_IFUNC symbol in position dependent
2977 // code, again so that function address comparisons work.
2978 if (gsym->is_from_dynobj()
2979 || gsym->is_undefined()
2980 || gsym->is_preemptible()
2981 || (gsym->visibility() == elfcpp::STV_PROTECTED
2982 && parameters->options().shared())
2983 || (gsym->type() == elfcpp::STT_GNU_IFUNC
2984 && parameters->options().output_is_position_independent()))
2985 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
2986 elfcpp::R_X86_64_GLOB_DAT);
2989 // For a STT_GNU_IFUNC symbol we want to write the PLT
2990 // offset into the GOT, so that function pointer
2991 // comparisons work correctly.
2993 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
2994 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
2997 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2998 // Tell the dynamic linker to use the PLT address
2999 // when resolving relocations.
3000 if (gsym->is_from_dynobj()
3001 && !parameters->options().shared())
3002 gsym->set_needs_dynsym_value();
3006 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
3007 rela_dyn->add_global_relative(gsym,
3008 elfcpp::R_X86_64_RELATIVE,
3009 got, got_off, 0, false);
3016 case elfcpp::R_X86_64_PLT32:
3017 case elfcpp::R_X86_64_PLT32_BND:
3018 // If the symbol is fully resolved, this is just a PC32 reloc.
3019 // Otherwise we need a PLT entry.
3020 if (gsym->final_value_is_known())
3022 // If building a shared library, we can also skip the PLT entry
3023 // if the symbol is defined in the output file and is protected
3025 if (gsym->is_defined()
3026 && !gsym->is_from_dynobj()
3027 && !gsym->is_preemptible())
3029 target->make_plt_entry(symtab, layout, gsym);
3032 case elfcpp::R_X86_64_GOTPC32:
3033 case elfcpp::R_X86_64_GOTOFF64:
3034 case elfcpp::R_X86_64_GOTPC64:
3035 case elfcpp::R_X86_64_PLTOFF64:
3036 // We need a GOT section.
3037 target->got_section(symtab, layout);
3038 // For PLTOFF64, we also need a PLT entry (but only if the
3039 // symbol is not fully resolved).
3040 if (r_type == elfcpp::R_X86_64_PLTOFF64
3041 && !gsym->final_value_is_known())
3042 target->make_plt_entry(symtab, layout, gsym);
3045 case elfcpp::R_X86_64_COPY:
3046 case elfcpp::R_X86_64_GLOB_DAT:
3047 case elfcpp::R_X86_64_JUMP_SLOT:
3048 case elfcpp::R_X86_64_RELATIVE:
3049 case elfcpp::R_X86_64_IRELATIVE:
3050 // These are outstanding tls relocs, which are unexpected when linking
3051 case elfcpp::R_X86_64_TPOFF64:
3052 case elfcpp::R_X86_64_DTPMOD64:
3053 case elfcpp::R_X86_64_TLSDESC:
3054 gold_error(_("%s: unexpected reloc %u in object file"),
3055 object->name().c_str(), r_type);
3058 // These are initial tls relocs, which are expected for global()
3059 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3060 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3061 case elfcpp::R_X86_64_TLSDESC_CALL:
3062 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
3063 case elfcpp::R_X86_64_DTPOFF32:
3064 case elfcpp::R_X86_64_DTPOFF64:
3065 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3066 case elfcpp::R_X86_64_TPOFF32: // Local-exec
3068 // For the Initial-Exec model, we can treat undef symbols as final
3069 // when building an executable.
3070 const bool is_final = (gsym->final_value_is_known() ||
3071 (r_type == elfcpp::R_X86_64_GOTTPOFF &&
3072 gsym->is_undefined() &&
3073 parameters->options().output_is_executable()));
3074 const tls::Tls_optimization optimized_type
3075 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
3078 case elfcpp::R_X86_64_TLSGD: // General-dynamic
3079 if (optimized_type == tls::TLSOPT_NONE)
3081 // Create a pair of GOT entries for the module index and
3082 // dtv-relative offset.
3083 Output_data_got<64, false>* got
3084 = target->got_section(symtab, layout);
3085 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
3086 target->rela_dyn_section(layout),
3087 elfcpp::R_X86_64_DTPMOD64,
3088 elfcpp::R_X86_64_DTPOFF64);
3090 else if (optimized_type == tls::TLSOPT_TO_IE)
3092 // Create a GOT entry for the tp-relative offset.
3093 Output_data_got<64, false>* got
3094 = target->got_section(symtab, layout);
3095 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
3096 target->rela_dyn_section(layout),
3097 elfcpp::R_X86_64_TPOFF64);
3099 else if (optimized_type != tls::TLSOPT_TO_LE)
3100 unsupported_reloc_global(object, r_type, gsym);
3103 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3104 target->define_tls_base_symbol(symtab, layout);
3105 if (optimized_type == tls::TLSOPT_NONE)
3107 // Create reserved PLT and GOT entries for the resolver.
3108 target->reserve_tlsdesc_entries(symtab, layout);
3110 // Create a double GOT entry with an R_X86_64_TLSDESC
3111 // reloc. The R_X86_64_TLSDESC reloc is resolved
3112 // lazily, so the GOT entry needs to be in an area in
3113 // .got.plt, not .got. Call got_section to make sure
3114 // the section has been created.
3115 target->got_section(symtab, layout);
3116 Output_data_got<64, false>* got = target->got_tlsdesc_section();
3117 Reloc_section* rt = target->rela_tlsdesc_section(layout);
3118 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
3119 elfcpp::R_X86_64_TLSDESC, 0);
3121 else if (optimized_type == tls::TLSOPT_TO_IE)
3123 // Create a GOT entry for the tp-relative offset.
3124 Output_data_got<64, false>* got
3125 = target->got_section(symtab, layout);
3126 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
3127 target->rela_dyn_section(layout),
3128 elfcpp::R_X86_64_TPOFF64);
3130 else if (optimized_type != tls::TLSOPT_TO_LE)
3131 unsupported_reloc_global(object, r_type, gsym);
3134 case elfcpp::R_X86_64_TLSDESC_CALL:
3137 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
3138 if (optimized_type == tls::TLSOPT_NONE)
3140 // Create a GOT entry for the module index.
3141 target->got_mod_index_entry(symtab, layout, object);
3143 else if (optimized_type != tls::TLSOPT_TO_LE)
3144 unsupported_reloc_global(object, r_type, gsym);
3147 case elfcpp::R_X86_64_DTPOFF32:
3148 case elfcpp::R_X86_64_DTPOFF64:
3151 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3152 layout->set_has_static_tls();
3153 if (optimized_type == tls::TLSOPT_NONE)
3155 // Create a GOT entry for the tp-relative offset.
3156 Output_data_got<64, false>* got
3157 = target->got_section(symtab, layout);
3158 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
3159 target->rela_dyn_section(layout),
3160 elfcpp::R_X86_64_TPOFF64);
3162 else if (optimized_type != tls::TLSOPT_TO_LE)
3163 unsupported_reloc_global(object, r_type, gsym);
3166 case elfcpp::R_X86_64_TPOFF32: // Local-exec
3167 layout->set_has_static_tls();
3168 if (parameters->options().shared())
3169 unsupported_reloc_global(object, r_type, gsym);
3178 case elfcpp::R_X86_64_SIZE32:
3179 case elfcpp::R_X86_64_SIZE64:
3181 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
3182 object->name().c_str(), r_type,
3183 gsym->demangled_name().c_str());
3190 Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
3192 Sized_relobj_file<size, false>* object,
3193 unsigned int data_shndx,
3194 unsigned int sh_type,
3195 const unsigned char* prelocs,
3197 Output_section* output_section,
3198 bool needs_special_offset_handling,
3199 size_t local_symbol_count,
3200 const unsigned char* plocal_symbols)
3202 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
3205 if (sh_type == elfcpp::SHT_REL)
3210 gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan,
3220 needs_special_offset_handling,
3225 // Scan relocations for a section.
3229 Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
3231 Sized_relobj_file<size, false>* object,
3232 unsigned int data_shndx,
3233 unsigned int sh_type,
3234 const unsigned char* prelocs,
3236 Output_section* output_section,
3237 bool needs_special_offset_handling,
3238 size_t local_symbol_count,
3239 const unsigned char* plocal_symbols)
3241 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
3244 if (sh_type == elfcpp::SHT_REL)
3246 gold_error(_("%s: unsupported REL reloc section"),
3247 object->name().c_str());
3251 gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>(
3260 needs_special_offset_handling,
3265 // Finalize the sections.
3269 Target_x86_64<size>::do_finalize_sections(
3271 const Input_objects*,
3272 Symbol_table* symtab)
3274 const Reloc_section* rel_plt = (this->plt_ == NULL
3276 : this->plt_->rela_plt());
3277 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
3278 this->rela_dyn_, true, false);
3280 // Fill in some more dynamic tags.
3281 Output_data_dynamic* const odyn = layout->dynamic_data();
3284 if (this->plt_ != NULL
3285 && this->plt_->output_section() != NULL
3286 && this->plt_->has_tlsdesc_entry())
3288 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
3289 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
3290 this->got_->finalize_data_size();
3291 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
3292 this->plt_, plt_offset);
3293 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
3294 this->got_, got_offset);
3298 // Emit any relocs we saved in an attempt to avoid generating COPY
3300 if (this->copy_relocs_.any_saved_relocs())
3301 this->copy_relocs_.emit(this->rela_dyn_section(layout));
3303 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3304 // the .got.plt section.
3305 Symbol* sym = this->global_offset_table_;
3308 uint64_t data_size = this->got_plt_->current_data_size();
3309 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
3312 if (parameters->doing_static_link()
3313 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
3315 // If linking statically, make sure that the __rela_iplt symbols
3316 // were defined if necessary, even if we didn't create a PLT.
3317 static const Define_symbol_in_segment syms[] =
3320 "__rela_iplt_start", // name
3321 elfcpp::PT_LOAD, // segment_type
3322 elfcpp::PF_W, // segment_flags_set
3323 elfcpp::PF(0), // segment_flags_clear
3326 elfcpp::STT_NOTYPE, // type
3327 elfcpp::STB_GLOBAL, // binding
3328 elfcpp::STV_HIDDEN, // visibility
3330 Symbol::SEGMENT_START, // offset_from_base
3334 "__rela_iplt_end", // name
3335 elfcpp::PT_LOAD, // segment_type
3336 elfcpp::PF_W, // segment_flags_set
3337 elfcpp::PF(0), // segment_flags_clear
3340 elfcpp::STT_NOTYPE, // type
3341 elfcpp::STB_GLOBAL, // binding
3342 elfcpp::STV_HIDDEN, // visibility
3344 Symbol::SEGMENT_START, // offset_from_base
3349 symtab->define_symbols(layout, 2, syms,
3350 layout->script_options()->saw_sections_clause());
3354 // For x32, we need to handle PC-relative relocations using full 64-bit
3355 // arithmetic, so that we can detect relocation overflows properly.
3356 // This class overrides the pcrela32_check methods from the defaults in
3357 // Relocate_functions in reloc.h.
3360 class X86_64_relocate_functions : public Relocate_functions<size, false>
3363 typedef Relocate_functions<size, false> Base;
3365 // Do a simple PC relative relocation with the addend in the
3367 static inline typename Base::Reloc_status
3368 pcrela32_check(unsigned char* view,
3369 typename elfcpp::Elf_types<64>::Elf_Addr value,
3370 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
3371 typename elfcpp::Elf_types<64>::Elf_Addr address)
3373 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
3374 Valtype* wv = reinterpret_cast<Valtype*>(view);
3375 value = value + addend - address;
3376 elfcpp::Swap<32, false>::writeval(wv, value);
3377 return (Bits<32>::has_overflow(value)
3378 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
3381 // Do a simple PC relative relocation with a Symbol_value with the
3382 // addend in the relocation.
3383 static inline typename Base::Reloc_status
3384 pcrela32_check(unsigned char* view,
3385 const Sized_relobj_file<size, false>* object,
3386 const Symbol_value<size>* psymval,
3387 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
3388 typename elfcpp::Elf_types<64>::Elf_Addr address)
3390 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
3391 Valtype* wv = reinterpret_cast<Valtype*>(view);
3392 typename elfcpp::Elf_types<64>::Elf_Addr value;
3394 value = psymval->value(object, addend);
3397 // For negative addends, get the symbol value without
3398 // the addend, then add the addend using 64-bit arithmetic.
3399 value = psymval->value(object, 0);
3403 elfcpp::Swap<32, false>::writeval(wv, value);
3404 return (Bits<32>::has_overflow(value)
3405 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
3409 // Perform a relocation.
3413 Target_x86_64<size>::Relocate::relocate(
3414 const Relocate_info<size, false>* relinfo,
3416 Target_x86_64<size>* target,
3419 const unsigned char* preloc,
3420 const Sized_symbol<size>* gsym,
3421 const Symbol_value<size>* psymval,
3422 unsigned char* view,
3423 typename elfcpp::Elf_types<size>::Elf_Addr address,
3424 section_size_type view_size)
3426 typedef X86_64_relocate_functions<size> Reloc_funcs;
3427 const elfcpp::Rela<size, false> rela(preloc);
3428 unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
3430 if (this->skip_call_tls_get_addr_)
3432 if ((r_type != elfcpp::R_X86_64_PLT32
3433 && r_type != elfcpp::R_X86_64_PLT32_BND
3434 && r_type != elfcpp::R_X86_64_PC32_BND
3435 && r_type != elfcpp::R_X86_64_PC32)
3437 || strcmp(gsym->name(), "__tls_get_addr") != 0)
3439 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3440 _("missing expected TLS relocation"));
3444 this->skip_call_tls_get_addr_ = false;
3452 const Sized_relobj_file<size, false>* object = relinfo->object;
3454 // Pick the value to use for symbols defined in the PLT.
3455 Symbol_value<size> symval;
3457 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
3459 symval.set_output_value(target->plt_address_for_global(gsym));
3462 else if (gsym == NULL && psymval->is_ifunc_symbol())
3464 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3465 if (object->local_has_plt_offset(r_sym))
3467 symval.set_output_value(target->plt_address_for_local(object, r_sym));
3472 const elfcpp::Elf_Xword addend = rela.get_r_addend();
3474 // Get the GOT offset if needed.
3475 // The GOT pointer points to the end of the GOT section.
3476 // We need to subtract the size of the GOT section to get
3477 // the actual offset to use in the relocation.
3478 bool have_got_offset = false;
3479 // Since the actual offset is always negative, we use signed int to
3480 // support 64-bit GOT relocations.
3484 case elfcpp::R_X86_64_GOT32:
3485 case elfcpp::R_X86_64_GOT64:
3486 case elfcpp::R_X86_64_GOTPLT64:
3487 case elfcpp::R_X86_64_GOTPCREL64:
3490 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3491 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3495 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3496 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3497 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3498 - target->got_size());
3500 have_got_offset = true;
3507 typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK;
3511 case elfcpp::R_X86_64_NONE:
3512 case elfcpp::R_X86_64_GNU_VTINHERIT:
3513 case elfcpp::R_X86_64_GNU_VTENTRY:
3516 case elfcpp::R_X86_64_64:
3517 Reloc_funcs::rela64(view, object, psymval, addend);
3520 case elfcpp::R_X86_64_PC64:
3521 Reloc_funcs::pcrela64(view, object, psymval, addend,
3525 case elfcpp::R_X86_64_32:
3526 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
3527 Reloc_funcs::CHECK_UNSIGNED);
3530 case elfcpp::R_X86_64_32S:
3531 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
3532 Reloc_funcs::CHECK_SIGNED);
3535 case elfcpp::R_X86_64_PC32:
3536 case elfcpp::R_X86_64_PC32_BND:
3537 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
3541 case elfcpp::R_X86_64_16:
3542 Reloc_funcs::rela16(view, object, psymval, addend);
3545 case elfcpp::R_X86_64_PC16:
3546 Reloc_funcs::pcrela16(view, object, psymval, addend, address);
3549 case elfcpp::R_X86_64_8:
3550 Reloc_funcs::rela8(view, object, psymval, addend);
3553 case elfcpp::R_X86_64_PC8:
3554 Reloc_funcs::pcrela8(view, object, psymval, addend, address);
3557 case elfcpp::R_X86_64_PLT32:
3558 case elfcpp::R_X86_64_PLT32_BND:
3559 gold_assert(gsym == NULL
3560 || gsym->has_plt_offset()
3561 || gsym->final_value_is_known()
3562 || (gsym->is_defined()
3563 && !gsym->is_from_dynobj()
3564 && !gsym->is_preemptible()));
3565 // Note: while this code looks the same as for R_X86_64_PC32, it
3566 // behaves differently because psymval was set to point to
3567 // the PLT entry, rather than the symbol, in Scan::global().
3568 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
3572 case elfcpp::R_X86_64_PLTOFF64:
3575 gold_assert(gsym->has_plt_offset()
3576 || gsym->final_value_is_known());
3577 typename elfcpp::Elf_types<size>::Elf_Addr got_address;
3578 // This is the address of GLOBAL_OFFSET_TABLE.
3579 got_address = target->got_plt_section()->address();
3580 Reloc_funcs::rela64(view, object, psymval, addend - got_address);
3584 case elfcpp::R_X86_64_GOT32:
3585 gold_assert(have_got_offset);
3586 Reloc_funcs::rela32(view, got_offset, addend);
3589 case elfcpp::R_X86_64_GOTPC32:
3592 typename elfcpp::Elf_types<size>::Elf_Addr value;
3593 value = target->got_plt_section()->address();
3594 Reloc_funcs::pcrela32_check(view, value, addend, address);
3598 case elfcpp::R_X86_64_GOT64:
3599 case elfcpp::R_X86_64_GOTPLT64:
3600 // R_X86_64_GOTPLT64 is obsolete and treated the the same as
3602 gold_assert(have_got_offset);
3603 Reloc_funcs::rela64(view, got_offset, addend);
3606 case elfcpp::R_X86_64_GOTPC64:
3609 typename elfcpp::Elf_types<size>::Elf_Addr value;
3610 value = target->got_plt_section()->address();
3611 Reloc_funcs::pcrela64(view, value, addend, address);
3615 case elfcpp::R_X86_64_GOTOFF64:
3617 typename elfcpp::Elf_types<size>::Elf_Addr value;
3618 value = (psymval->value(object, 0)
3619 - target->got_plt_section()->address());
3620 Reloc_funcs::rela64(view, value, addend);
3624 case elfcpp::R_X86_64_GOTPCREL:
3625 case elfcpp::R_X86_64_GOTPCRELX:
3626 case elfcpp::R_X86_64_REX_GOTPCRELX:
3629 // mov foo@GOTPCREL(%rip), %reg
3630 // to lea foo(%rip), %reg.
3632 if (rela.get_r_offset() >= 2
3634 && ((gsym == NULL && !psymval->is_ifunc_symbol())
3636 && Target_x86_64<size>::can_convert_mov_to_lea(gsym))))
3639 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
3645 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3646 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3650 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3651 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3652 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3653 - target->got_size());
3655 typename elfcpp::Elf_types<size>::Elf_Addr value;
3656 value = target->got_plt_section()->address() + got_offset;
3657 Reloc_funcs::pcrela32_check(view, value, addend, address);
3662 case elfcpp::R_X86_64_GOTPCREL64:
3664 gold_assert(have_got_offset);
3665 typename elfcpp::Elf_types<size>::Elf_Addr value;
3666 value = target->got_plt_section()->address() + got_offset;
3667 Reloc_funcs::pcrela64(view, value, addend, address);
3671 case elfcpp::R_X86_64_COPY:
3672 case elfcpp::R_X86_64_GLOB_DAT:
3673 case elfcpp::R_X86_64_JUMP_SLOT:
3674 case elfcpp::R_X86_64_RELATIVE:
3675 case elfcpp::R_X86_64_IRELATIVE:
3676 // These are outstanding tls relocs, which are unexpected when linking
3677 case elfcpp::R_X86_64_TPOFF64:
3678 case elfcpp::R_X86_64_DTPMOD64:
3679 case elfcpp::R_X86_64_TLSDESC:
3680 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3681 _("unexpected reloc %u in object file"),
3685 // These are initial tls relocs, which are expected when linking
3686 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3687 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3688 case elfcpp::R_X86_64_TLSDESC_CALL:
3689 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
3690 case elfcpp::R_X86_64_DTPOFF32:
3691 case elfcpp::R_X86_64_DTPOFF64:
3692 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3693 case elfcpp::R_X86_64_TPOFF32: // Local-exec
3694 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
3695 view, address, view_size);
3698 case elfcpp::R_X86_64_SIZE32:
3699 case elfcpp::R_X86_64_SIZE64:
3701 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3702 _("unsupported reloc %u"),
3707 if (rstatus == Reloc_funcs::RELOC_OVERFLOW)
3711 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3712 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3713 _("relocation overflow: "
3714 "reference to local symbol %u in %s"),
3715 r_sym, object->name().c_str());
3717 else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT)
3719 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3720 _("relocation overflow: "
3721 "reference to '%s' defined in %s"),
3723 gsym->object()->name().c_str());
3727 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3728 _("relocation overflow: reference to '%s'"),
3736 // Perform a TLS relocation.
3740 Target_x86_64<size>::Relocate::relocate_tls(
3741 const Relocate_info<size, false>* relinfo,
3742 Target_x86_64<size>* target,
3744 const elfcpp::Rela<size, false>& rela,
3745 unsigned int r_type,
3746 const Sized_symbol<size>* gsym,
3747 const Symbol_value<size>* psymval,
3748 unsigned char* view,
3749 typename elfcpp::Elf_types<size>::Elf_Addr address,
3750 section_size_type view_size)
3752 Output_segment* tls_segment = relinfo->layout->tls_segment();
3754 const Sized_relobj_file<size, false>* object = relinfo->object;
3755 const elfcpp::Elf_Xword addend = rela.get_r_addend();
3756 elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
3757 bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
3759 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
3761 const bool is_final = (gsym == NULL
3762 ? !parameters->options().shared()
3763 : gsym->final_value_is_known());
3764 tls::Tls_optimization optimized_type
3765 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
3768 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3769 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3771 // If this code sequence is used in a non-executable section,
3772 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3773 // on the assumption that it's being used by itself in a debug
3774 // section. Therefore, in the unlikely event that the code
3775 // sequence appears in a non-executable section, we simply
3776 // leave it unoptimized.
3777 optimized_type = tls::TLSOPT_NONE;
3779 if (optimized_type == tls::TLSOPT_TO_LE)
3781 if (tls_segment == NULL)
3783 gold_assert(parameters->errors()->error_count() > 0
3784 || issue_undefined_symbol_error(gsym));
3787 this->tls_gd_to_le(relinfo, relnum, tls_segment,
3788 rela, r_type, value, view,
3794 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3795 ? GOT_TYPE_TLS_OFFSET
3796 : GOT_TYPE_TLS_PAIR);
3797 unsigned int got_offset;
3800 gold_assert(gsym->has_got_offset(got_type));
3801 got_offset = gsym->got_offset(got_type) - target->got_size();
3805 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3806 gold_assert(object->local_has_got_offset(r_sym, got_type));
3807 got_offset = (object->local_got_offset(r_sym, got_type)
3808 - target->got_size());
3810 if (optimized_type == tls::TLSOPT_TO_IE)
3812 value = target->got_plt_section()->address() + got_offset;
3813 this->tls_gd_to_ie(relinfo, relnum, rela, r_type,
3814 value, view, address, view_size);
3817 else if (optimized_type == tls::TLSOPT_NONE)
3819 // Relocate the field with the offset of the pair of GOT
3821 value = target->got_plt_section()->address() + got_offset;
3822 Relocate_functions<size, false>::pcrela32(view, value, addend,
3827 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3828 _("unsupported reloc %u"), r_type);
3831 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3832 case elfcpp::R_X86_64_TLSDESC_CALL:
3833 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3835 // See above comment for R_X86_64_TLSGD.
3836 optimized_type = tls::TLSOPT_NONE;
3838 if (optimized_type == tls::TLSOPT_TO_LE)
3840 if (tls_segment == NULL)
3842 gold_assert(parameters->errors()->error_count() > 0
3843 || issue_undefined_symbol_error(gsym));
3846 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
3847 rela, r_type, value, view,
3853 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3854 ? GOT_TYPE_TLS_OFFSET
3855 : GOT_TYPE_TLS_DESC);
3856 unsigned int got_offset = 0;
3857 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
3858 && optimized_type == tls::TLSOPT_NONE)
3860 // We created GOT entries in the .got.tlsdesc portion of
3861 // the .got.plt section, but the offset stored in the
3862 // symbol is the offset within .got.tlsdesc.
3863 got_offset = (target->got_size()
3864 + target->got_plt_section()->data_size());
3868 gold_assert(gsym->has_got_offset(got_type));
3869 got_offset += gsym->got_offset(got_type) - target->got_size();
3873 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3874 gold_assert(object->local_has_got_offset(r_sym, got_type));
3875 got_offset += (object->local_got_offset(r_sym, got_type)
3876 - target->got_size());
3878 if (optimized_type == tls::TLSOPT_TO_IE)
3880 value = target->got_plt_section()->address() + got_offset;
3881 this->tls_desc_gd_to_ie(relinfo, relnum,
3882 rela, r_type, value, view, address,
3886 else if (optimized_type == tls::TLSOPT_NONE)
3888 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3890 // Relocate the field with the offset of the pair of GOT
3892 value = target->got_plt_section()->address() + got_offset;
3893 Relocate_functions<size, false>::pcrela32(view, value, addend,
3899 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3900 _("unsupported reloc %u"), r_type);
3903 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
3904 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3906 // See above comment for R_X86_64_TLSGD.
3907 optimized_type = tls::TLSOPT_NONE;
3909 if (optimized_type == tls::TLSOPT_TO_LE)
3911 if (tls_segment == NULL)
3913 gold_assert(parameters->errors()->error_count() > 0
3914 || issue_undefined_symbol_error(gsym));
3917 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
3918 value, view, view_size);
3921 else if (optimized_type == tls::TLSOPT_NONE)
3923 // Relocate the field with the offset of the GOT entry for
3924 // the module index.
3925 unsigned int got_offset;
3926 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
3927 - target->got_size());
3928 value = target->got_plt_section()->address() + got_offset;
3929 Relocate_functions<size, false>::pcrela32(view, value, addend,
3933 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3934 _("unsupported reloc %u"), r_type);
3937 case elfcpp::R_X86_64_DTPOFF32:
3938 // This relocation type is used in debugging information.
3939 // In that case we need to not optimize the value. If the
3940 // section is not executable, then we assume we should not
3941 // optimize this reloc. See comments above for R_X86_64_TLSGD,
3942 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
3944 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3946 if (tls_segment == NULL)
3948 gold_assert(parameters->errors()->error_count() > 0
3949 || issue_undefined_symbol_error(gsym));
3952 value -= tls_segment->memsz();
3954 Relocate_functions<size, false>::rela32(view, value, addend);
3957 case elfcpp::R_X86_64_DTPOFF64:
3958 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
3959 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3961 if (tls_segment == NULL)
3963 gold_assert(parameters->errors()->error_count() > 0
3964 || issue_undefined_symbol_error(gsym));
3967 value -= tls_segment->memsz();
3969 Relocate_functions<size, false>::rela64(view, value, addend);
3972 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3974 && gsym->is_undefined()
3975 && parameters->options().output_is_executable())
3977 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3979 r_type, value, view,
3983 else if (optimized_type == tls::TLSOPT_TO_LE)
3985 if (tls_segment == NULL)
3987 gold_assert(parameters->errors()->error_count() > 0
3988 || issue_undefined_symbol_error(gsym));
3991 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3993 r_type, value, view,
3997 else if (optimized_type == tls::TLSOPT_NONE)
3999 // Relocate the field with the offset of the GOT entry for
4000 // the tp-relative offset of the symbol.
4001 unsigned int got_offset;
4004 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
4005 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
4006 - target->got_size());
4010 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
4011 gold_assert(object->local_has_got_offset(r_sym,
4012 GOT_TYPE_TLS_OFFSET));
4013 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
4014 - target->got_size());
4016 value = target->got_plt_section()->address() + got_offset;
4017 Relocate_functions<size, false>::pcrela32(view, value, addend,
4021 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4022 _("unsupported reloc type %u"),
4026 case elfcpp::R_X86_64_TPOFF32: // Local-exec
4027 if (tls_segment == NULL)
4029 gold_assert(parameters->errors()->error_count() > 0
4030 || issue_undefined_symbol_error(gsym));
4033 value -= tls_segment->memsz();
4034 Relocate_functions<size, false>::rela32(view, value, addend);
4039 // Do a relocation in which we convert a TLS General-Dynamic to an
4044 Target_x86_64<size>::Relocate::tls_gd_to_ie(
4045 const Relocate_info<size, false>* relinfo,
4047 const elfcpp::Rela<size, false>& rela,
4049 typename elfcpp::Elf_types<size>::Elf_Addr value,
4050 unsigned char* view,
4051 typename elfcpp::Elf_types<size>::Elf_Addr address,
4052 section_size_type view_size)
4055 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4056 // .word 0x6666; rex64; call __tls_get_addr
4057 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
4059 // leaq foo@tlsgd(%rip),%rdi;
4060 // .word 0x6666; rex64; call __tls_get_addr
4061 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
4063 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
4064 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4065 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
4069 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4071 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4072 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
4073 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
4078 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4080 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4081 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
4082 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
4086 const elfcpp::Elf_Xword addend = rela.get_r_addend();
4087 Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
4090 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4092 this->skip_call_tls_get_addr_ = true;
4095 // Do a relocation in which we convert a TLS General-Dynamic to a
4100 Target_x86_64<size>::Relocate::tls_gd_to_le(
4101 const Relocate_info<size, false>* relinfo,
4103 Output_segment* tls_segment,
4104 const elfcpp::Rela<size, false>& rela,
4106 typename elfcpp::Elf_types<size>::Elf_Addr value,
4107 unsigned char* view,
4108 section_size_type view_size)
4111 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4112 // .word 0x6666; rex64; call __tls_get_addr
4113 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
4115 // leaq foo@tlsgd(%rip),%rdi;
4116 // .word 0x6666; rex64; call __tls_get_addr
4117 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
4119 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
4120 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4121 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
4125 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4127 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4128 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
4129 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4134 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4136 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4137 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
4139 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4143 value -= tls_segment->memsz();
4144 Relocate_functions<size, false>::rela32(view + 8, value, 0);
4146 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4148 this->skip_call_tls_get_addr_ = true;
4151 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
4155 Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
4156 const Relocate_info<size, false>* relinfo,
4158 const elfcpp::Rela<size, false>& rela,
4159 unsigned int r_type,
4160 typename elfcpp::Elf_types<size>::Elf_Addr value,
4161 unsigned char* view,
4162 typename elfcpp::Elf_types<size>::Elf_Addr address,
4163 section_size_type view_size)
4165 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4167 // leaq foo@tlsdesc(%rip), %rax
4168 // ==> movq foo@gottpoff(%rip), %rax
4169 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4170 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4171 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4172 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
4174 const elfcpp::Elf_Xword addend = rela.get_r_addend();
4175 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
4179 // call *foo@tlscall(%rax)
4181 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4182 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4183 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4184 view[0] == 0xff && view[1] == 0x10);
4190 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
4194 Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
4195 const Relocate_info<size, false>* relinfo,
4197 Output_segment* tls_segment,
4198 const elfcpp::Rela<size, false>& rela,
4199 unsigned int r_type,
4200 typename elfcpp::Elf_types<size>::Elf_Addr value,
4201 unsigned char* view,
4202 section_size_type view_size)
4204 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4206 // leaq foo@tlsdesc(%rip), %rax
4207 // ==> movq foo@tpoff, %rax
4208 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4209 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4210 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4211 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
4214 value -= tls_segment->memsz();
4215 Relocate_functions<size, false>::rela32(view, value, 0);
4219 // call *foo@tlscall(%rax)
4221 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4222 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4223 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4224 view[0] == 0xff && view[1] == 0x10);
4232 Target_x86_64<size>::Relocate::tls_ld_to_le(
4233 const Relocate_info<size, false>* relinfo,
4236 const elfcpp::Rela<size, false>& rela,
4238 typename elfcpp::Elf_types<size>::Elf_Addr,
4239 unsigned char* view,
4240 section_size_type view_size)
4242 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
4244 // ... leq foo@dtpoff(%rax),%reg
4245 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
4247 // ... leq foo@dtpoff(%rax),%reg
4248 // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
4250 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4251 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
4253 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4254 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
4256 tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
4259 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
4261 memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
4263 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4265 this->skip_call_tls_get_addr_ = true;
4268 // Do a relocation in which we convert a TLS Initial-Exec to a
4273 Target_x86_64<size>::Relocate::tls_ie_to_le(
4274 const Relocate_info<size, false>* relinfo,
4276 Output_segment* tls_segment,
4277 const elfcpp::Rela<size, false>& rela,
4279 typename elfcpp::Elf_types<size>::Elf_Addr value,
4280 unsigned char* view,
4281 section_size_type view_size)
4283 // We need to examine the opcodes to figure out which instruction we
4286 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
4287 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
4289 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4290 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4292 unsigned char op1 = view[-3];
4293 unsigned char op2 = view[-2];
4294 unsigned char op3 = view[-1];
4295 unsigned char reg = op3 >> 3;
4302 else if (size == 32 && op1 == 0x44)
4305 view[-1] = 0xc0 | reg;
4309 // Special handling for %rsp.
4312 else if (size == 32 && op1 == 0x44)
4315 view[-1] = 0xc0 | reg;
4322 else if (size == 32 && op1 == 0x44)
4325 view[-1] = 0x80 | reg | (reg << 3);
4328 if (tls_segment != NULL)
4329 value -= tls_segment->memsz();
4330 Relocate_functions<size, false>::rela32(view, value, 0);
4333 // Relocate section data.
4337 Target_x86_64<size>::relocate_section(
4338 const Relocate_info<size, false>* relinfo,
4339 unsigned int sh_type,
4340 const unsigned char* prelocs,
4342 Output_section* output_section,
4343 bool needs_special_offset_handling,
4344 unsigned char* view,
4345 typename elfcpp::Elf_types<size>::Elf_Addr address,
4346 section_size_type view_size,
4347 const Reloc_symbol_changes* reloc_symbol_changes)
4349 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4352 gold_assert(sh_type == elfcpp::SHT_RELA);
4354 gold::relocate_section<size, false, Target_x86_64<size>, Relocate,
4355 gold::Default_comdat_behavior, Classify_reloc>(
4361 needs_special_offset_handling,
4365 reloc_symbol_changes);
4368 // Apply an incremental relocation. Incremental relocations always refer
4369 // to global symbols.
4373 Target_x86_64<size>::apply_relocation(
4374 const Relocate_info<size, false>* relinfo,
4375 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
4376 unsigned int r_type,
4377 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
4379 unsigned char* view,
4380 typename elfcpp::Elf_types<size>::Elf_Addr address,
4381 section_size_type view_size)
4383 gold::apply_relocation<size, false, Target_x86_64<size>,
4384 typename Target_x86_64<size>::Relocate>(
4396 // Scan the relocs during a relocatable link.
4400 Target_x86_64<size>::scan_relocatable_relocs(
4401 Symbol_table* symtab,
4403 Sized_relobj_file<size, false>* object,
4404 unsigned int data_shndx,
4405 unsigned int sh_type,
4406 const unsigned char* prelocs,
4408 Output_section* output_section,
4409 bool needs_special_offset_handling,
4410 size_t local_symbol_count,
4411 const unsigned char* plocal_symbols,
4412 Relocatable_relocs* rr)
4414 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4416 typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
4417 Scan_relocatable_relocs;
4419 gold_assert(sh_type == elfcpp::SHT_RELA);
4421 gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>(
4429 needs_special_offset_handling,
4435 // Scan the relocs for --emit-relocs.
4439 Target_x86_64<size>::emit_relocs_scan(
4440 Symbol_table* symtab,
4442 Sized_relobj_file<size, false>* object,
4443 unsigned int data_shndx,
4444 unsigned int sh_type,
4445 const unsigned char* prelocs,
4447 Output_section* output_section,
4448 bool needs_special_offset_handling,
4449 size_t local_symbol_count,
4450 const unsigned char* plocal_syms,
4451 Relocatable_relocs* rr)
4453 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4455 typedef gold::Default_emit_relocs_strategy<Classify_reloc>
4456 Emit_relocs_strategy;
4458 gold_assert(sh_type == elfcpp::SHT_RELA);
4460 gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>(
4468 needs_special_offset_handling,
4474 // Relocate a section during a relocatable link.
4478 Target_x86_64<size>::relocate_relocs(
4479 const Relocate_info<size, false>* relinfo,
4480 unsigned int sh_type,
4481 const unsigned char* prelocs,
4483 Output_section* output_section,
4484 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
4485 unsigned char* view,
4486 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
4487 section_size_type view_size,
4488 unsigned char* reloc_view,
4489 section_size_type reloc_view_size)
4491 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4494 gold_assert(sh_type == elfcpp::SHT_RELA);
4496 gold::relocate_relocs<size, false, Classify_reloc>(
4501 offset_in_output_section,
4509 // Return the value to use for a dynamic which requires special
4510 // treatment. This is how we support equality comparisons of function
4511 // pointers across shared library boundaries, as described in the
4512 // processor specific ABI supplement.
4516 Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4518 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
4519 return this->plt_address_for_global(gsym);
4522 // Return a string used to fill a code section with nops to take up
4523 // the specified length.
4527 Target_x86_64<size>::do_code_fill(section_size_type length) const
4531 // Build a jmpq instruction to skip over the bytes.
4532 unsigned char jmp[5];
4534 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
4535 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
4536 + std::string(length - 5, static_cast<char>(0x90)));
4539 // Nop sequences of various lengths.
4540 const char nop1[1] = { '\x90' }; // nop
4541 const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
4542 const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4543 const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
4545 const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
4547 const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
4548 '\x44', '\x00', '\x00' };
4549 const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
4550 '\x00', '\x00', '\x00',
4552 const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
4553 '\x00', '\x00', '\x00',
4555 const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
4556 '\x84', '\x00', '\x00',
4557 '\x00', '\x00', '\x00' };
4558 const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4559 '\x1f', '\x84', '\x00',
4560 '\x00', '\x00', '\x00',
4562 const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
4563 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4564 '\x00', '\x00', '\x00',
4566 const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
4567 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4568 '\x84', '\x00', '\x00',
4569 '\x00', '\x00', '\x00' };
4570 const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
4571 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
4572 '\x1f', '\x84', '\x00',
4573 '\x00', '\x00', '\x00',
4575 const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
4576 '\x66', '\x66', '\x2e', // data16
4577 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4578 '\x00', '\x00', '\x00',
4580 const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
4581 '\x66', '\x66', '\x66', // data16; data16
4582 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4583 '\x84', '\x00', '\x00',
4584 '\x00', '\x00', '\x00' };
4586 const char* nops[16] = {
4588 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
4589 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
4592 return std::string(nops[length], length);
4595 // Return the addend to use for a target specific relocation. The
4596 // only target specific relocation is R_X86_64_TLSDESC for a local
4597 // symbol. We want to set the addend is the offset of the local
4598 // symbol in the TLS segment.
4602 Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
4605 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
4606 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
4607 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
4608 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
4609 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
4610 gold_assert(psymval->is_tls_symbol());
4611 // The value of a TLS symbol is the offset in the TLS segment.
4612 return psymval->value(ti.object, 0);
4615 // Return the value to use for the base of a DW_EH_PE_datarel offset
4616 // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
4617 // assembler can not write out the difference between two labels in
4618 // different sections, so instead of using a pc-relative value they
4619 // use an offset from the GOT.
4623 Target_x86_64<size>::do_ehframe_datarel_base() const
4625 gold_assert(this->global_offset_table_ != NULL);
4626 Symbol* sym = this->global_offset_table_;
4627 Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
4628 return ssym->value();
4631 // FNOFFSET in section SHNDX in OBJECT is the start of a function
4632 // compiled with -fsplit-stack. The function calls non-split-stack
4633 // code. We have to change the function so that it always ensures
4634 // that it has enough stack space to run some random function.
4636 static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 };
4637 static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 };
4638 static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 };
4640 static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 };
4641 static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 };
4642 static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 };
4646 Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
4647 section_offset_type fnoffset,
4648 section_size_type fnsize,
4649 const unsigned char*,
4651 unsigned char* view,
4652 section_size_type view_size,
4654 std::string* to) const
4656 const char* const cmp_insn = reinterpret_cast<const char*>
4657 (size == 32 ? cmp_insn_32 : cmp_insn_64);
4658 const char* const lea_r10_insn = reinterpret_cast<const char*>
4659 (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64);
4660 const char* const lea_r11_insn = reinterpret_cast<const char*>
4661 (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64);
4663 const size_t cmp_insn_len =
4664 (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64));
4665 const size_t lea_r10_insn_len =
4666 (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64));
4667 const size_t lea_r11_insn_len =
4668 (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64));
4669 const size_t nop_len = (size == 32 ? 7 : 8);
4671 // The function starts with a comparison of the stack pointer and a
4672 // field in the TCB. This is followed by a jump.
4675 if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len)
4676 && fnsize > nop_len + 1)
4678 // We will call __morestack if the carry flag is set after this
4679 // comparison. We turn the comparison into an stc instruction
4681 view[fnoffset] = '\xf9';
4682 this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len);
4684 // lea NN(%rsp),%r10
4685 // lea NN(%rsp),%r11
4686 else if ((this->match_view(view, view_size, fnoffset,
4687 lea_r10_insn, lea_r10_insn_len)
4688 || this->match_view(view, view_size, fnoffset,
4689 lea_r11_insn, lea_r11_insn_len))
4692 // This is loading an offset from the stack pointer for a
4693 // comparison. The offset is negative, so we decrease the
4694 // offset by the amount of space we need for the stack. This
4695 // means we will avoid calling __morestack if there happens to
4696 // be plenty of space on the stack already.
4697 unsigned char* pval = view + fnoffset + 4;
4698 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
4699 val -= parameters->options().split_stack_adjust_size();
4700 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
4704 if (!object->has_no_split_stack())
4705 object->error(_("failed to match split-stack sequence at "
4706 "section %u offset %0zx"),
4707 shndx, static_cast<size_t>(fnoffset));
4711 // We have to change the function so that it calls
4712 // __morestack_non_split instead of __morestack. The former will
4713 // allocate additional stack space.
4714 *from = "__morestack";
4715 *to = "__morestack_non_split";
4718 // The selector for x86_64 object files. Note this is never instantiated
4719 // directly. It's only used in Target_selector_x86_64_nacl, below.
4722 class Target_selector_x86_64 : public Target_selector_freebsd
4725 Target_selector_x86_64()
4726 : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
4728 ? "elf64-x86-64" : "elf32-x86-64"),
4730 ? "elf64-x86-64-freebsd"
4731 : "elf32-x86-64-freebsd"),
4732 (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
4736 do_instantiate_target()
4737 { return new Target_x86_64<size>(); }
4741 // NaCl variant. It uses different PLT contents.
4744 class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
4747 Output_data_plt_x86_64_nacl(Layout* layout,
4748 Output_data_got<64, false>* got,
4749 Output_data_got_plt_x86_64* got_plt,
4750 Output_data_space* got_irelative)
4751 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4752 got, got_plt, got_irelative)
4755 Output_data_plt_x86_64_nacl(Layout* layout,
4756 Output_data_got<64, false>* got,
4757 Output_data_got_plt_x86_64* got_plt,
4758 Output_data_space* got_irelative,
4759 unsigned int plt_count)
4760 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4761 got, got_plt, got_irelative,
4766 virtual unsigned int
4767 do_get_plt_entry_size() const
4768 { return plt_entry_size; }
4771 do_add_eh_frame(Layout* layout)
4773 layout->add_eh_frame_for_plt(this,
4774 this->plt_eh_frame_cie,
4775 this->plt_eh_frame_cie_size,
4777 plt_eh_frame_fde_size);
4781 do_fill_first_plt_entry(unsigned char* pov,
4782 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
4783 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
4785 virtual unsigned int
4786 do_fill_plt_entry(unsigned char* pov,
4787 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4788 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4789 unsigned int got_offset,
4790 unsigned int plt_offset,
4791 unsigned int plt_index);
4794 do_fill_tlsdesc_entry(unsigned char* pov,
4795 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4796 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4797 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4798 unsigned int tlsdesc_got_offset,
4799 unsigned int plt_offset);
4802 // The size of an entry in the PLT.
4803 static const int plt_entry_size = 64;
4805 // The first entry in the PLT.
4806 static const unsigned char first_plt_entry[plt_entry_size];
4808 // Other entries in the PLT for an executable.
4809 static const unsigned char plt_entry[plt_entry_size];
4811 // The reserved TLSDESC entry in the PLT for an executable.
4812 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
4814 // The .eh_frame unwind information for the PLT.
4815 static const int plt_eh_frame_fde_size = 32;
4816 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
4820 class Target_x86_64_nacl : public Target_x86_64<size>
4823 Target_x86_64_nacl()
4824 : Target_x86_64<size>(&x86_64_nacl_info)
4827 virtual Output_data_plt_x86_64<size>*
4828 do_make_data_plt(Layout* layout,
4829 Output_data_got<64, false>* got,
4830 Output_data_got_plt_x86_64* got_plt,
4831 Output_data_space* got_irelative)
4833 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4837 virtual Output_data_plt_x86_64<size>*
4838 do_make_data_plt(Layout* layout,
4839 Output_data_got<64, false>* got,
4840 Output_data_got_plt_x86_64* got_plt,
4841 Output_data_space* got_irelative,
4842 unsigned int plt_count)
4844 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4850 do_code_fill(section_size_type length) const;
4853 static const Target::Target_info x86_64_nacl_info;
4857 const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
4860 false, // is_big_endian
4861 elfcpp::EM_X86_64, // machine_code
4862 false, // has_make_symbol
4863 false, // has_resolve
4864 true, // has_code_fill
4865 true, // is_default_stack_executable
4866 true, // can_icf_inline_merge_sections
4868 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
4869 0x20000, // default_text_segment_address
4870 0x10000, // abi_pagesize (overridable by -z max-page-size)
4871 0x10000, // common_pagesize (overridable by -z common-page-size)
4872 true, // isolate_execinstr
4873 0x10000000, // rosegment_gap
4874 elfcpp::SHN_UNDEF, // small_common_shndx
4875 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
4876 0, // small_common_section_flags
4877 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
4878 NULL, // attributes_section
4879 NULL, // attributes_vendor
4880 "_start", // entry_symbol_name
4881 32, // hash_entry_size
4885 const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
4888 false, // is_big_endian
4889 elfcpp::EM_X86_64, // machine_code
4890 false, // has_make_symbol
4891 false, // has_resolve
4892 true, // has_code_fill
4893 true, // is_default_stack_executable
4894 true, // can_icf_inline_merge_sections
4896 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
4897 0x20000, // default_text_segment_address
4898 0x10000, // abi_pagesize (overridable by -z max-page-size)
4899 0x10000, // common_pagesize (overridable by -z common-page-size)
4900 true, // isolate_execinstr
4901 0x10000000, // rosegment_gap
4902 elfcpp::SHN_UNDEF, // small_common_shndx
4903 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
4904 0, // small_common_section_flags
4905 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
4906 NULL, // attributes_section
4907 NULL, // attributes_vendor
4908 "_start", // entry_symbol_name
4909 32, // hash_entry_size
4912 #define NACLMASK 0xe0 // 32-byte alignment mask.
4914 // The first entry in the PLT.
4918 Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
4920 0xff, 0x35, // pushq contents of memory address
4921 0, 0, 0, 0, // replaced with address of .got + 8
4922 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
4923 0, 0, 0, 0, // replaced with address of .got + 16
4924 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4925 0x4d, 0x01, 0xfb, // add %r15, %r11
4926 0x41, 0xff, 0xe3, // jmpq *%r11
4928 // 9-byte nop sequence to pad out to the next 32-byte boundary.
4929 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
4931 // 32 bytes of nop to pad out to the standard size
4932 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4933 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4934 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4935 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4936 0x66, // excess data32 prefix
4942 Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
4944 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4945 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
4947 memcpy(pov, first_plt_entry, plt_entry_size);
4948 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4950 - (plt_address + 2 + 4)));
4951 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4953 - (plt_address + 9 + 4)));
4956 // Subsequent entries in the PLT.
4960 Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
4962 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
4963 0, 0, 0, 0, // replaced with address of symbol in .got
4964 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4965 0x4d, 0x01, 0xfb, // add %r15, %r11
4966 0x41, 0xff, 0xe3, // jmpq *%r11
4968 // 15-byte nop sequence to pad out to the next 32-byte boundary.
4969 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4970 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4972 // Lazy GOT entries point here (32-byte aligned).
4973 0x68, // pushq immediate
4974 0, 0, 0, 0, // replaced with index into relocation table
4975 0xe9, // jmp relative
4976 0, 0, 0, 0, // replaced with offset to start of .plt0
4978 // 22 bytes of nop to pad out to the standard size.
4979 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4980 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4981 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
4986 Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
4988 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4989 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4990 unsigned int got_offset,
4991 unsigned int plt_offset,
4992 unsigned int plt_index)
4994 memcpy(pov, plt_entry, plt_entry_size);
4995 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
4996 (got_address + got_offset
4997 - (plt_address + plt_offset
5000 elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
5001 elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
5002 - (plt_offset + 38 + 4));
5007 // The reserved TLSDESC entry in the PLT.
5011 Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
5013 0xff, 0x35, // pushq x(%rip)
5014 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
5015 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
5016 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
5017 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
5018 0x4d, 0x01, 0xfb, // add %r15, %r11
5019 0x41, 0xff, 0xe3, // jmpq *%r11
5021 // 41 bytes of nop to pad out to the standard size.
5022 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5023 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5024 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5025 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5026 0x66, 0x66, // excess data32 prefixes
5027 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5032 Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
5034 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
5035 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
5036 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
5037 unsigned int tlsdesc_got_offset,
5038 unsigned int plt_offset)
5040 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
5041 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
5043 - (plt_address + plt_offset
5045 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
5047 + tlsdesc_got_offset
5048 - (plt_address + plt_offset
5052 // The .eh_frame unwind information for the PLT.
5056 Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
5058 0, 0, 0, 0, // Replaced with offset to .plt.
5059 0, 0, 0, 0, // Replaced with size of .plt.
5060 0, // Augmentation size.
5061 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
5062 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
5063 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
5064 elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
5065 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
5066 13, // Block length.
5067 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
5068 elfcpp::DW_OP_breg16, 0, // Push %rip.
5069 elfcpp::DW_OP_const1u, 63, // Push 0x3f.
5070 elfcpp::DW_OP_and, // & (%rip & 0x3f).
5071 elfcpp::DW_OP_const1u, 37, // Push 0x25.
5072 elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
5073 elfcpp::DW_OP_lit3, // Push 3.
5074 elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
5075 elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
5076 elfcpp::DW_CFA_nop, // Align to 32 bytes.
5080 // Return a string used to fill a code section with nops.
5081 // For NaCl, long NOPs are only valid if they do not cross
5082 // bundle alignment boundaries, so keep it simple with one-byte NOPs.
5085 Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
5087 return std::string(length, static_cast<char>(0x90));
5090 // The selector for x86_64-nacl object files.
5093 class Target_selector_x86_64_nacl
5094 : public Target_selector_nacl<Target_selector_x86_64<size>,
5095 Target_x86_64_nacl<size> >
5098 Target_selector_x86_64_nacl()
5099 : Target_selector_nacl<Target_selector_x86_64<size>,
5100 Target_x86_64_nacl<size> >("x86-64",
5102 ? "elf64-x86-64-nacl"
5103 : "elf32-x86-64-nacl",
5106 : "elf32_x86_64_nacl")
5110 Target_selector_x86_64_nacl<64> target_selector_x86_64;
5111 Target_selector_x86_64_nacl<32> target_selector_x32;
5113 } // End anonymous namespace.