1 // reloc.cc -- relocate input files for gold.
3 // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
27 #include "workqueue.h"
32 #include "target-reloc.h"
38 // Read_relocs methods.
40 // These tasks just read the relocation information from the file.
41 // After reading it, the start another task to process the
42 // information. These tasks requires access to the file.
45 Read_relocs::is_runnable()
47 return this->object_->is_locked() ? this->object_->token() : NULL;
53 Read_relocs::locks(Task_locker* tl)
55 tl->add(this, this->object_->token());
58 // Read the relocations and then start a Scan_relocs_task.
61 Read_relocs::run(Workqueue* workqueue)
63 Read_relocs_data *rd = new Read_relocs_data;
64 this->object_->read_relocs(rd);
65 this->object_->set_relocs_data(rd);
66 this->object_->release();
68 // If garbage collection is desired, we must process the relocs
69 // instead of scanning the relocs as reloc processing is necessary
70 // to determine unused sections.
71 if (parameters->options().gc_sections())
73 workqueue->queue_next(new Gc_process_relocs(this->options_,
82 workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_,
83 this->layout_, this->object_, rd,
89 // Return a debugging name for the task.
92 Read_relocs::get_name() const
94 return "Read_relocs " + this->object_->name();
97 // Gc_process_relocs methods.
99 // These tasks process the relocations read by Read_relocs and
100 // determine which sections are referenced and which are garbage.
101 // This task is done only when --gc-sections is used.
104 Gc_process_relocs::is_runnable()
106 if (this->object_->is_locked())
107 return this->object_->token();
112 Gc_process_relocs::locks(Task_locker* tl)
114 tl->add(this, this->object_->token());
115 tl->add(this, this->blocker_);
119 Gc_process_relocs::run(Workqueue*)
121 this->object_->gc_process_relocs(this->options_, this->symtab_, this->layout_,
123 this->object_->release();
126 // Return a debugging name for the task.
129 Gc_process_relocs::get_name() const
131 return "Gc_process_relocs " + this->object_->name();
134 // Scan_relocs methods.
136 // These tasks scan the relocations read by Read_relocs and mark up
137 // the symbol table to indicate which relocations are required. We
138 // use a lock on the symbol table to keep them from interfering with
142 Scan_relocs::is_runnable()
144 if (!this->symtab_lock_->is_writable())
145 return this->symtab_lock_;
146 if (this->object_->is_locked())
147 return this->object_->token();
151 // Return the locks we hold: one on the file, one on the symbol table
155 Scan_relocs::locks(Task_locker* tl)
157 tl->add(this, this->object_->token());
158 tl->add(this, this->symtab_lock_);
159 tl->add(this, this->blocker_);
165 Scan_relocs::run(Workqueue*)
167 this->object_->scan_relocs(this->options_, this->symtab_, this->layout_,
169 this->object_->release();
174 // Return a debugging name for the task.
177 Scan_relocs::get_name() const
179 return "Scan_relocs " + this->object_->name();
182 // Relocate_task methods.
184 // We may have to wait for the output sections to be written.
187 Relocate_task::is_runnable()
189 if (this->object_->relocs_must_follow_section_writes()
190 && this->output_sections_blocker_->is_blocked())
191 return this->output_sections_blocker_;
193 if (this->object_->is_locked())
194 return this->object_->token();
199 // We want to lock the file while we run. We want to unblock
200 // INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done.
201 // INPUT_SECTIONS_BLOCKER may be NULL.
204 Relocate_task::locks(Task_locker* tl)
206 if (this->input_sections_blocker_ != NULL)
207 tl->add(this, this->input_sections_blocker_);
208 tl->add(this, this->final_blocker_);
209 tl->add(this, this->object_->token());
215 Relocate_task::run(Workqueue*)
217 this->object_->relocate(this->options_, this->symtab_, this->layout_,
220 // This is normally the last thing we will do with an object, so
221 // uncache all views.
222 this->object_->clear_view_cache_marks();
224 this->object_->release();
227 // Return a debugging name for the task.
230 Relocate_task::get_name() const
232 return "Relocate_task " + this->object_->name();
235 // Read the relocs and local symbols from the object file and store
236 // the information in RD.
238 template<int size, bool big_endian>
240 Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd)
244 unsigned int shnum = this->shnum();
248 rd->relocs.reserve(shnum / 2);
250 const Output_sections& out_sections(this->output_sections());
251 const std::vector<Address>& out_offsets(this->section_offsets_);
253 const unsigned char *pshdrs = this->get_view(this->elf_file_.shoff(),
254 shnum * This::shdr_size,
256 // Skip the first, dummy, section.
257 const unsigned char *ps = pshdrs + This::shdr_size;
258 for (unsigned int i = 1; i < shnum; ++i, ps += This::shdr_size)
260 typename This::Shdr shdr(ps);
262 unsigned int sh_type = shdr.get_sh_type();
263 if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
266 unsigned int shndx = this->adjust_shndx(shdr.get_sh_info());
269 this->error(_("relocation section %u has bad info %u"),
274 Output_section* os = out_sections[shndx];
278 // We are scanning relocations in order to fill out the GOT and
279 // PLT sections. Relocations for sections which are not
280 // allocated (typically debugging sections) should not add new
281 // GOT and PLT entries. So we skip them unless this is a
282 // relocatable link or we need to emit relocations. FIXME: What
283 // should we do if a linker script maps a section with SHF_ALLOC
284 // clear to a section with SHF_ALLOC set?
285 typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size);
286 bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC)
288 if (!is_section_allocated
289 && !parameters->options().relocatable()
290 && !parameters->options().emit_relocs())
293 if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
295 this->error(_("relocation section %u uses unexpected "
297 i, this->adjust_shndx(shdr.get_sh_link()));
301 off_t sh_size = shdr.get_sh_size();
303 unsigned int reloc_size;
304 if (sh_type == elfcpp::SHT_REL)
305 reloc_size = elfcpp::Elf_sizes<size>::rel_size;
307 reloc_size = elfcpp::Elf_sizes<size>::rela_size;
308 if (reloc_size != shdr.get_sh_entsize())
310 this->error(_("unexpected entsize for reloc section %u: %lu != %u"),
311 i, static_cast<unsigned long>(shdr.get_sh_entsize()),
316 size_t reloc_count = sh_size / reloc_size;
317 if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
319 this->error(_("reloc section %u size %lu uneven"),
320 i, static_cast<unsigned long>(sh_size));
324 rd->relocs.push_back(Section_relocs());
325 Section_relocs& sr(rd->relocs.back());
327 sr.data_shndx = shndx;
328 sr.contents = this->get_lasting_view(shdr.get_sh_offset(), sh_size,
330 sr.sh_type = sh_type;
331 sr.reloc_count = reloc_count;
332 sr.output_section = os;
333 sr.needs_special_offset_handling = out_offsets[shndx] == invalid_address;
334 sr.is_data_section_allocated = is_section_allocated;
337 // Read the local symbols.
338 gold_assert(this->symtab_shndx_ != -1U);
339 if (this->symtab_shndx_ == 0 || this->local_symbol_count_ == 0)
340 rd->local_symbols = NULL;
343 typename This::Shdr symtabshdr(pshdrs
344 + this->symtab_shndx_ * This::shdr_size);
345 gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB);
346 const int sym_size = This::sym_size;
347 const unsigned int loccount = this->local_symbol_count_;
348 gold_assert(loccount == symtabshdr.get_sh_info());
349 off_t locsize = loccount * sym_size;
350 rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(),
351 locsize, true, true);
355 // Process the relocs to generate mappings from source sections to referenced
356 // sections. This is used during garbage colletion to determine garbage
359 template<int size, bool big_endian>
361 Sized_relobj<size, big_endian>::do_gc_process_relocs(const General_options& options,
362 Symbol_table* symtab,
364 Read_relocs_data* rd)
366 Sized_target<size, big_endian>* target = this->sized_target();
368 const unsigned char* local_symbols;
369 if (rd->local_symbols == NULL)
370 local_symbols = NULL;
372 local_symbols = rd->local_symbols->data();
374 for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
375 p != rd->relocs.end();
378 if (!parameters->options().relocatable())
380 // As noted above, when not generating an object file, we
381 // only scan allocated sections. We may see a non-allocated
382 // section here if we are emitting relocs.
383 if (p->is_data_section_allocated)
384 target->gc_process_relocs(options, symtab, layout, this,
385 p->data_shndx, p->sh_type,
386 p->contents->data(), p->reloc_count,
388 p->needs_special_offset_handling,
389 this->local_symbol_count_,
396 // Scan the relocs and adjust the symbol table. This looks for
397 // relocations which require GOT/PLT/COPY relocations.
399 template<int size, bool big_endian>
401 Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options,
402 Symbol_table* symtab,
404 Read_relocs_data* rd)
406 Sized_target<size, big_endian>* target = this->sized_target();
408 const unsigned char* local_symbols;
409 if (rd->local_symbols == NULL)
410 local_symbols = NULL;
412 local_symbols = rd->local_symbols->data();
414 for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin();
415 p != rd->relocs.end();
418 // When garbage collection is on, unreferenced sections are not included
419 // in the link that would have been included normally. This is known only
420 // after Read_relocs hence this check has to be done again.
421 if (parameters->options().gc_sections())
423 if (p->output_section == NULL)
426 if (!parameters->options().relocatable())
428 // As noted above, when not generating an object file, we
429 // only scan allocated sections. We may see a non-allocated
430 // section here if we are emitting relocs.
431 if (p->is_data_section_allocated)
432 target->scan_relocs(options, symtab, layout, this, p->data_shndx,
433 p->sh_type, p->contents->data(),
434 p->reloc_count, p->output_section,
435 p->needs_special_offset_handling,
436 this->local_symbol_count_,
438 if (parameters->options().emit_relocs())
439 this->emit_relocs_scan(options, symtab, layout, local_symbols, p);
443 Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
444 gold_assert(rr != NULL);
445 rr->set_reloc_count(p->reloc_count);
446 target->scan_relocatable_relocs(options, symtab, layout, this,
447 p->data_shndx, p->sh_type,
451 p->needs_special_offset_handling,
452 this->local_symbol_count_,
461 if (rd->local_symbols != NULL)
463 delete rd->local_symbols;
464 rd->local_symbols = NULL;
468 // This is a strategy class we use when scanning for --emit-relocs.
470 template<int sh_type>
471 class Emit_relocs_strategy
474 // A local non-section symbol.
475 inline Relocatable_relocs::Reloc_strategy
476 local_non_section_strategy(unsigned int, Relobj*, unsigned int)
477 { return Relocatable_relocs::RELOC_COPY; }
479 // A local section symbol.
480 inline Relocatable_relocs::Reloc_strategy
481 local_section_strategy(unsigned int, Relobj*)
483 if (sh_type == elfcpp::SHT_RELA)
484 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA;
487 // The addend is stored in the section contents. Since this
488 // is not a relocatable link, we are going to apply the
489 // relocation contents to the section as usual. This means
490 // that we have no way to record the original addend. If the
491 // original addend is not zero, there is basically no way for
492 // the user to handle this correctly. Caveat emptor.
493 return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0;
498 inline Relocatable_relocs::Reloc_strategy
499 global_strategy(unsigned int, Relobj*, unsigned int)
500 { return Relocatable_relocs::RELOC_COPY; }
503 // Scan the input relocations for --emit-relocs.
505 template<int size, bool big_endian>
507 Sized_relobj<size, big_endian>::emit_relocs_scan(
508 const General_options& options,
509 Symbol_table* symtab,
511 const unsigned char* plocal_syms,
512 const Read_relocs_data::Relocs_list::iterator& p)
514 Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx);
515 gold_assert(rr != NULL);
516 rr->set_reloc_count(p->reloc_count);
518 if (p->sh_type == elfcpp::SHT_REL)
519 this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(options, symtab, layout,
523 gold_assert(p->sh_type == elfcpp::SHT_RELA);
524 this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(options, symtab,
525 layout, plocal_syms, p,
530 // Scan the input relocation for --emit-relocs, templatized on the
531 // type of the relocation section.
533 template<int size, bool big_endian>
534 template<int sh_type>
536 Sized_relobj<size, big_endian>::emit_relocs_scan_reltype(
537 const General_options& options,
538 Symbol_table* symtab,
540 const unsigned char* plocal_syms,
541 const Read_relocs_data::Relocs_list::iterator& p,
542 Relocatable_relocs* rr)
544 scan_relocatable_relocs<size, big_endian, sh_type,
545 Emit_relocs_strategy<sh_type> >(
554 p->needs_special_offset_handling,
555 this->local_symbol_count_,
560 // Relocate the input sections and write out the local symbols.
562 template<int size, bool big_endian>
564 Sized_relobj<size, big_endian>::do_relocate(const General_options& options,
565 const Symbol_table* symtab,
566 const Layout* layout,
569 unsigned int shnum = this->shnum();
571 // Read the section headers.
572 const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(),
573 shnum * This::shdr_size,
579 // Make two passes over the sections. The first one copies the
580 // section data to the output file. The second one applies
583 this->write_sections(pshdrs, of, &views);
585 // To speed up relocations, we set up hash tables for fast lookup of
586 // input offsets to output addresses.
587 this->initialize_input_to_output_maps();
589 // Apply relocations.
591 this->relocate_sections(options, symtab, layout, pshdrs, &views);
593 // After we've done the relocations, we release the hash tables,
594 // since we no longer need them.
595 this->free_input_to_output_maps();
597 // Write out the accumulated views.
598 for (unsigned int i = 1; i < shnum; ++i)
600 if (views[i].view != NULL)
602 if (!views[i].is_postprocessing_view)
604 if (views[i].is_input_output_view)
605 of->write_input_output_view(views[i].offset,
609 of->write_output_view(views[i].offset, views[i].view_size,
615 // Write out the local symbols.
616 this->write_local_symbols(of, layout->sympool(), layout->dynpool(),
617 layout->symtab_xindex(), layout->dynsym_xindex());
619 // We should no longer need the local symbol values.
620 this->clear_local_symbols();
623 // Sort a Read_multiple vector by file offset.
624 struct Read_multiple_compare
627 operator()(const File_read::Read_multiple_entry& rme1,
628 const File_read::Read_multiple_entry& rme2) const
629 { return rme1.file_offset < rme2.file_offset; }
632 // Write section data to the output file. PSHDRS points to the
633 // section headers. Record the views in *PVIEWS for use when
636 template<int size, bool big_endian>
638 Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs,
642 unsigned int shnum = this->shnum();
643 const Output_sections& out_sections(this->output_sections());
644 const std::vector<Address>& out_offsets(this->section_offsets_);
646 File_read::Read_multiple rm;
647 bool is_sorted = true;
649 const unsigned char* p = pshdrs + This::shdr_size;
650 for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
652 View_size* pvs = &(*pviews)[i];
656 const Output_section* os = out_sections[i];
659 Address output_offset = out_offsets[i];
661 typename This::Shdr shdr(p);
663 if (shdr.get_sh_type() == elfcpp::SHT_NOBITS)
666 if ((parameters->options().relocatable()
667 || parameters->options().emit_relocs())
668 && (shdr.get_sh_type() == elfcpp::SHT_REL
669 || shdr.get_sh_type() == elfcpp::SHT_RELA)
670 && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
672 // This is a reloc section in a relocatable link or when
673 // emitting relocs. We don't need to read the input file.
674 // The size and file offset are stored in the
675 // Relocatable_relocs structure.
676 Relocatable_relocs* rr = this->relocatable_relocs(i);
677 gold_assert(rr != NULL);
678 Output_data* posd = rr->output_data();
679 gold_assert(posd != NULL);
681 pvs->offset = posd->offset();
682 pvs->view_size = posd->data_size();
683 pvs->view = of->get_output_view(pvs->offset, pvs->view_size);
684 pvs->address = posd->address();
685 pvs->is_input_output_view = false;
686 pvs->is_postprocessing_view = false;
691 // In the normal case, this input section is simply mapped to
692 // the output section at offset OUTPUT_OFFSET.
694 // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is
695 // handled specially--e.g., a .eh_frame section. The relocation
696 // routines need to check for each reloc where it should be
697 // applied. For this case, we need an input/output view for the
698 // entire contents of the section in the output file. We don't
699 // want to copy the contents of the input section to the output
700 // section; the output section contents were already written,
701 // and we waited for them in Relocate_task::is_runnable because
702 // relocs_must_follow_section_writes is set for the object.
704 // Regardless of which of the above cases is true, we have to
705 // check requires_postprocessing of the output section. If that
706 // is false, then we work with views of the output file
707 // directly. If it is true, then we work with a separate
708 // buffer, and the output section is responsible for writing the
709 // final data to the output file.
711 off_t output_section_offset;
712 Address output_section_size;
713 if (!os->requires_postprocessing())
715 output_section_offset = os->offset();
716 output_section_size = convert_types<Address, off_t>(os->data_size());
720 output_section_offset = 0;
721 output_section_size =
722 convert_types<Address, off_t>(os->postprocessing_buffer_size());
726 section_size_type view_size;
727 if (output_offset != invalid_address)
729 view_start = output_section_offset + output_offset;
730 view_size = convert_to_section_size_type(shdr.get_sh_size());
734 view_start = output_section_offset;
735 view_size = convert_to_section_size_type(output_section_size);
741 gold_assert(output_offset == invalid_address
742 || output_offset + view_size <= output_section_size);
745 if (os->requires_postprocessing())
747 unsigned char* buffer = os->postprocessing_buffer();
748 view = buffer + view_start;
749 if (output_offset != invalid_address)
751 off_t sh_offset = shdr.get_sh_offset();
752 if (!rm.empty() && rm.back().file_offset > sh_offset)
754 rm.push_back(File_read::Read_multiple_entry(sh_offset,
760 if (output_offset == invalid_address)
761 view = of->get_input_output_view(view_start, view_size);
764 view = of->get_output_view(view_start, view_size);
765 off_t sh_offset = shdr.get_sh_offset();
766 if (!rm.empty() && rm.back().file_offset > sh_offset)
768 rm.push_back(File_read::Read_multiple_entry(sh_offset,
774 pvs->address = os->address();
775 if (output_offset != invalid_address)
776 pvs->address += output_offset;
777 pvs->offset = view_start;
778 pvs->view_size = view_size;
779 pvs->is_input_output_view = output_offset == invalid_address;
780 pvs->is_postprocessing_view = os->requires_postprocessing();
783 // Actually read the data.
787 std::sort(rm.begin(), rm.end(), Read_multiple_compare());
788 this->read_multiple(rm);
792 // Relocate section data. VIEWS points to the section data as views
793 // in the output file.
795 template<int size, bool big_endian>
797 Sized_relobj<size, big_endian>::relocate_sections(
798 const General_options& options,
799 const Symbol_table* symtab,
800 const Layout* layout,
801 const unsigned char* pshdrs,
804 unsigned int shnum = this->shnum();
805 Sized_target<size, big_endian>* target = this->sized_target();
807 const Output_sections& out_sections(this->output_sections());
808 const std::vector<Address>& out_offsets(this->section_offsets_);
810 Relocate_info<size, big_endian> relinfo;
811 relinfo.options = &options;
812 relinfo.symtab = symtab;
813 relinfo.layout = layout;
814 relinfo.object = this;
816 const unsigned char* p = pshdrs + This::shdr_size;
817 for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size)
819 typename This::Shdr shdr(p);
821 unsigned int sh_type = shdr.get_sh_type();
822 if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA)
825 unsigned int index = this->adjust_shndx(shdr.get_sh_info());
826 if (index >= this->shnum())
828 this->error(_("relocation section %u has bad info %u"),
833 Output_section* os = out_sections[index];
836 // This relocation section is against a section which we
840 Address output_offset = out_offsets[index];
842 gold_assert((*pviews)[index].view != NULL);
843 if (parameters->options().relocatable())
844 gold_assert((*pviews)[i].view != NULL);
846 if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_)
848 gold_error(_("relocation section %u uses unexpected "
850 i, this->adjust_shndx(shdr.get_sh_link()));
854 off_t sh_size = shdr.get_sh_size();
855 const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(),
856 sh_size, true, false);
858 unsigned int reloc_size;
859 if (sh_type == elfcpp::SHT_REL)
860 reloc_size = elfcpp::Elf_sizes<size>::rel_size;
862 reloc_size = elfcpp::Elf_sizes<size>::rela_size;
864 if (reloc_size != shdr.get_sh_entsize())
866 gold_error(_("unexpected entsize for reloc section %u: %lu != %u"),
867 i, static_cast<unsigned long>(shdr.get_sh_entsize()),
872 size_t reloc_count = sh_size / reloc_size;
873 if (static_cast<off_t>(reloc_count * reloc_size) != sh_size)
875 gold_error(_("reloc section %u size %lu uneven"),
876 i, static_cast<unsigned long>(sh_size));
880 gold_assert(output_offset != invalid_address
881 || this->relocs_must_follow_section_writes());
883 relinfo.reloc_shndx = i;
884 relinfo.data_shndx = index;
885 if (!parameters->options().relocatable())
887 target->relocate_section(&relinfo,
892 output_offset == invalid_address,
893 (*pviews)[index].view,
894 (*pviews)[index].address,
895 (*pviews)[index].view_size);
896 if (parameters->options().emit_relocs())
897 this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count,
899 (*pviews)[index].view,
900 (*pviews)[index].address,
901 (*pviews)[index].view_size,
903 (*pviews)[i].view_size);
907 Relocatable_relocs* rr = this->relocatable_relocs(i);
908 target->relocate_for_relocatable(&relinfo,
915 (*pviews)[index].view,
916 (*pviews)[index].address,
917 (*pviews)[index].view_size,
919 (*pviews)[i].view_size);
924 // Emit the relocs for --emit-relocs.
926 template<int size, bool big_endian>
928 Sized_relobj<size, big_endian>::emit_relocs(
929 const Relocate_info<size, big_endian>* relinfo,
931 unsigned int sh_type,
932 const unsigned char* prelocs,
934 Output_section* output_section,
935 typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section,
937 typename elfcpp::Elf_types<size>::Elf_Addr address,
938 section_size_type view_size,
939 unsigned char* reloc_view,
940 section_size_type reloc_view_size)
942 if (sh_type == elfcpp::SHT_REL)
943 this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs,
944 reloc_count, output_section,
945 offset_in_output_section,
946 view, address, view_size,
947 reloc_view, reloc_view_size);
950 gold_assert(sh_type == elfcpp::SHT_RELA);
951 this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs,
952 reloc_count, output_section,
953 offset_in_output_section,
954 view, address, view_size,
955 reloc_view, reloc_view_size);
959 // Emit the relocs for --emit-relocs, templatized on the type of the
960 // relocation section.
962 template<int size, bool big_endian>
963 template<int sh_type>
965 Sized_relobj<size, big_endian>::emit_relocs_reltype(
966 const Relocate_info<size, big_endian>* relinfo,
968 const unsigned char* prelocs,
970 Output_section* output_section,
971 typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section,
973 typename elfcpp::Elf_types<size>::Elf_Addr address,
974 section_size_type view_size,
975 unsigned char* reloc_view,
976 section_size_type reloc_view_size)
978 const Relocatable_relocs* rr = this->relocatable_relocs(i);
979 relocate_for_relocatable<size, big_endian, sh_type>(
984 offset_in_output_section,
993 // Create merge hash tables for the local symbols. These are used to
994 // speed up relocations.
996 template<int size, bool big_endian>
998 Sized_relobj<size, big_endian>::initialize_input_to_output_maps()
1000 const unsigned int loccount = this->local_symbol_count_;
1001 for (unsigned int i = 1; i < loccount; ++i)
1003 Symbol_value<size>& lv(this->local_values_[i]);
1004 lv.initialize_input_to_output_map(this);
1008 // Free merge hash tables for the local symbols.
1010 template<int size, bool big_endian>
1012 Sized_relobj<size, big_endian>::free_input_to_output_maps()
1014 const unsigned int loccount = this->local_symbol_count_;
1015 for (unsigned int i = 1; i < loccount; ++i)
1017 Symbol_value<size>& lv(this->local_values_[i]);
1018 lv.free_input_to_output_map();
1022 // Class Merged_symbol_value.
1026 Merged_symbol_value<size>::initialize_input_to_output_map(
1027 const Relobj* object,
1028 unsigned int input_shndx)
1030 Object_merge_map* map = object->merge_map();
1031 map->initialize_input_to_output_map<size>(input_shndx,
1032 this->output_start_address_,
1033 &this->output_addresses_);
1036 // Get the output value corresponding to an input offset if we
1037 // couldn't find it in the hash table.
1040 typename elfcpp::Elf_types<size>::Elf_Addr
1041 Merged_symbol_value<size>::value_from_output_section(
1042 const Relobj* object,
1043 unsigned int input_shndx,
1044 typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const
1046 section_offset_type output_offset;
1047 bool found = object->merge_map()->get_output_offset(NULL, input_shndx,
1051 // If this assertion fails, it means that some relocation was
1052 // against a portion of an input merge section which we didn't map
1053 // to the output file and we didn't explicitly discard. We should
1054 // always map all portions of input merge sections.
1057 if (output_offset == -1)
1060 return this->output_start_address_ + output_offset;
1063 // Track_relocs methods.
1065 // Initialize the class to track the relocs. This gets the object,
1066 // the reloc section index, and the type of the relocs. This returns
1067 // false if something goes wrong.
1069 template<int size, bool big_endian>
1071 Track_relocs<size, big_endian>::initialize(
1073 unsigned int reloc_shndx,
1074 unsigned int reloc_type)
1076 // If RELOC_SHNDX is -1U, it means there is more than one reloc
1077 // section for the .eh_frame section. We can't handle that case.
1078 if (reloc_shndx == -1U)
1081 // If RELOC_SHNDX is 0, there is no reloc section.
1082 if (reloc_shndx == 0)
1085 // Get the contents of the reloc section.
1086 this->prelocs_ = object->section_contents(reloc_shndx, &this->len_, false);
1088 if (reloc_type == elfcpp::SHT_REL)
1089 this->reloc_size_ = elfcpp::Elf_sizes<size>::rel_size;
1090 else if (reloc_type == elfcpp::SHT_RELA)
1091 this->reloc_size_ = elfcpp::Elf_sizes<size>::rela_size;
1095 if (this->len_ % this->reloc_size_ != 0)
1097 object->error(_("reloc section size %zu is not a multiple of "
1099 static_cast<size_t>(this->len_),
1107 // Return the offset of the next reloc, or -1 if there isn't one.
1109 template<int size, bool big_endian>
1111 Track_relocs<size, big_endian>::next_offset() const
1113 if (this->pos_ >= this->len_)
1116 // Rel and Rela start out the same, so we can always use Rel to find
1117 // the r_offset value.
1118 elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
1119 return rel.get_r_offset();
1122 // Return the index of the symbol referenced by the next reloc, or -1U
1123 // if there aren't any more relocs.
1125 template<int size, bool big_endian>
1127 Track_relocs<size, big_endian>::next_symndx() const
1129 if (this->pos_ >= this->len_)
1132 // Rel and Rela start out the same, so we can use Rel to find the
1134 elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
1135 return elfcpp::elf_r_sym<size>(rel.get_r_info());
1138 // Advance to the next reloc whose r_offset is greater than or equal
1139 // to OFFSET. Return the number of relocs we skip.
1141 template<int size, bool big_endian>
1143 Track_relocs<size, big_endian>::advance(off_t offset)
1146 while (this->pos_ < this->len_)
1148 // Rel and Rela start out the same, so we can always use Rel to
1149 // find the r_offset value.
1150 elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_);
1151 if (static_cast<off_t>(rel.get_r_offset()) >= offset)
1154 this->pos_ += this->reloc_size_;
1159 // Instantiate the templates we need.
1161 #ifdef HAVE_TARGET_32_LITTLE
1164 Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd);
1167 #ifdef HAVE_TARGET_32_BIG
1170 Sized_relobj<32, true>::do_read_relocs(Read_relocs_data* rd);
1173 #ifdef HAVE_TARGET_64_LITTLE
1176 Sized_relobj<64, false>::do_read_relocs(Read_relocs_data* rd);
1179 #ifdef HAVE_TARGET_64_BIG
1182 Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd);
1185 #ifdef HAVE_TARGET_32_LITTLE
1188 Sized_relobj<32, false>::do_gc_process_relocs(const General_options& options,
1189 Symbol_table* symtab,
1191 Read_relocs_data* rd);
1194 #ifdef HAVE_TARGET_32_BIG
1197 Sized_relobj<32, true>::do_gc_process_relocs(const General_options& options,
1198 Symbol_table* symtab,
1200 Read_relocs_data* rd);
1203 #ifdef HAVE_TARGET_64_LITTLE
1206 Sized_relobj<64, false>::do_gc_process_relocs(const General_options& options,
1207 Symbol_table* symtab,
1209 Read_relocs_data* rd);
1212 #ifdef HAVE_TARGET_64_BIG
1215 Sized_relobj<64, true>::do_gc_process_relocs(const General_options& options,
1216 Symbol_table* symtab,
1218 Read_relocs_data* rd);
1221 #ifdef HAVE_TARGET_32_LITTLE
1224 Sized_relobj<32, false>::do_scan_relocs(const General_options& options,
1225 Symbol_table* symtab,
1227 Read_relocs_data* rd);
1230 #ifdef HAVE_TARGET_32_BIG
1233 Sized_relobj<32, true>::do_scan_relocs(const General_options& options,
1234 Symbol_table* symtab,
1236 Read_relocs_data* rd);
1239 #ifdef HAVE_TARGET_64_LITTLE
1242 Sized_relobj<64, false>::do_scan_relocs(const General_options& options,
1243 Symbol_table* symtab,
1245 Read_relocs_data* rd);
1248 #ifdef HAVE_TARGET_64_BIG
1251 Sized_relobj<64, true>::do_scan_relocs(const General_options& options,
1252 Symbol_table* symtab,
1254 Read_relocs_data* rd);
1257 #ifdef HAVE_TARGET_32_LITTLE
1260 Sized_relobj<32, false>::do_relocate(const General_options& options,
1261 const Symbol_table* symtab,
1262 const Layout* layout,
1266 #ifdef HAVE_TARGET_32_BIG
1269 Sized_relobj<32, true>::do_relocate(const General_options& options,
1270 const Symbol_table* symtab,
1271 const Layout* layout,
1275 #ifdef HAVE_TARGET_64_LITTLE
1278 Sized_relobj<64, false>::do_relocate(const General_options& options,
1279 const Symbol_table* symtab,
1280 const Layout* layout,
1284 #ifdef HAVE_TARGET_64_BIG
1287 Sized_relobj<64, true>::do_relocate(const General_options& options,
1288 const Symbol_table* symtab,
1289 const Layout* layout,
1293 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1295 class Merged_symbol_value<32>;
1298 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1300 class Merged_symbol_value<64>;
1303 #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG)
1305 class Symbol_value<32>;
1308 #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG)
1310 class Symbol_value<64>;
1313 #ifdef HAVE_TARGET_32_LITTLE
1315 class Track_relocs<32, false>;
1318 #ifdef HAVE_TARGET_32_BIG
1320 class Track_relocs<32, true>;
1323 #ifdef HAVE_TARGET_64_LITTLE
1325 class Track_relocs<64, false>;
1328 #ifdef HAVE_TARGET_64_BIG
1330 class Track_relocs<64, true>;
1333 } // End namespace gold.