1 // output.cc -- manage the output file for gold
3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
8 // This program is free software; you can redistribute it and/or modify
9 // it under the terms of the GNU General Public License as published by
10 // the Free Software Foundation; either version 3 of the License, or
11 // (at your option) any later version.
13 // This program is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 // MA 02110-1301, USA.
33 #include "libiberty.h" // for unlink_if_ordinary()
35 #include "parameters.h"
42 // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
44 # define MAP_ANONYMOUS MAP_ANON
50 // Output_data variables.
52 bool Output_data::allocated_sizes_are_fixed;
54 // Output_data methods.
56 Output_data::~Output_data()
60 // Return the default alignment for the target size.
63 Output_data::default_alignment()
65 return Output_data::default_alignment_for_size(
66 parameters->target().get_size());
69 // Return the default alignment for a size--32 or 64.
72 Output_data::default_alignment_for_size(int size)
82 // Output_section_header methods. This currently assumes that the
83 // segment and section lists are complete at construction time.
85 Output_section_headers::Output_section_headers(
87 const Layout::Segment_list* segment_list,
88 const Layout::Section_list* section_list,
89 const Layout::Section_list* unattached_section_list,
90 const Stringpool* secnamepool)
92 segment_list_(segment_list),
93 section_list_(section_list),
94 unattached_section_list_(unattached_section_list),
95 secnamepool_(secnamepool)
97 // Count all the sections. Start with 1 for the null section.
99 if (!parameters->options().relocatable())
101 for (Layout::Segment_list::const_iterator p = segment_list->begin();
102 p != segment_list->end();
104 if ((*p)->type() == elfcpp::PT_LOAD)
105 count += (*p)->output_section_count();
109 for (Layout::Section_list::const_iterator p = section_list->begin();
110 p != section_list->end();
112 if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0)
115 count += unattached_section_list->size();
117 const int size = parameters->target().get_size();
120 shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
122 shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
126 this->set_data_size(count * shdr_size);
129 // Write out the section headers.
132 Output_section_headers::do_write(Output_file* of)
134 switch (parameters->size_and_endianness())
136 #ifdef HAVE_TARGET_32_LITTLE
137 case Parameters::TARGET_32_LITTLE:
138 this->do_sized_write<32, false>(of);
141 #ifdef HAVE_TARGET_32_BIG
142 case Parameters::TARGET_32_BIG:
143 this->do_sized_write<32, true>(of);
146 #ifdef HAVE_TARGET_64_LITTLE
147 case Parameters::TARGET_64_LITTLE:
148 this->do_sized_write<64, false>(of);
151 #ifdef HAVE_TARGET_64_BIG
152 case Parameters::TARGET_64_BIG:
153 this->do_sized_write<64, true>(of);
161 template<int size, bool big_endian>
163 Output_section_headers::do_sized_write(Output_file* of)
165 off_t all_shdrs_size = this->data_size();
166 unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
168 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
169 unsigned char* v = view;
172 typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
173 oshdr.put_sh_name(0);
174 oshdr.put_sh_type(elfcpp::SHT_NULL);
175 oshdr.put_sh_flags(0);
176 oshdr.put_sh_addr(0);
177 oshdr.put_sh_offset(0);
178 oshdr.put_sh_size(0);
179 oshdr.put_sh_link(0);
180 oshdr.put_sh_info(0);
181 oshdr.put_sh_addralign(0);
182 oshdr.put_sh_entsize(0);
187 unsigned int shndx = 1;
188 if (!parameters->options().relocatable())
190 for (Layout::Segment_list::const_iterator p =
191 this->segment_list_->begin();
192 p != this->segment_list_->end();
194 v = (*p)->write_section_headers<size, big_endian>(this->layout_,
201 for (Layout::Section_list::const_iterator p =
202 this->section_list_->begin();
203 p != this->section_list_->end();
206 // We do unallocated sections below, except that group
207 // sections have to come first.
208 if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0
209 && (*p)->type() != elfcpp::SHT_GROUP)
211 gold_assert(shndx == (*p)->out_shndx());
212 elfcpp::Shdr_write<size, big_endian> oshdr(v);
213 (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
219 for (Layout::Section_list::const_iterator p =
220 this->unattached_section_list_->begin();
221 p != this->unattached_section_list_->end();
224 // For a relocatable link, we did unallocated group sections
225 // above, since they have to come first.
226 if ((*p)->type() == elfcpp::SHT_GROUP
227 && parameters->options().relocatable())
229 gold_assert(shndx == (*p)->out_shndx());
230 elfcpp::Shdr_write<size, big_endian> oshdr(v);
231 (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
236 of->write_output_view(this->offset(), all_shdrs_size, view);
239 // Output_segment_header methods.
241 Output_segment_headers::Output_segment_headers(
242 const Layout::Segment_list& segment_list)
243 : segment_list_(segment_list)
245 const int size = parameters->target().get_size();
248 phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
250 phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
254 this->set_data_size(segment_list.size() * phdr_size);
258 Output_segment_headers::do_write(Output_file* of)
260 switch (parameters->size_and_endianness())
262 #ifdef HAVE_TARGET_32_LITTLE
263 case Parameters::TARGET_32_LITTLE:
264 this->do_sized_write<32, false>(of);
267 #ifdef HAVE_TARGET_32_BIG
268 case Parameters::TARGET_32_BIG:
269 this->do_sized_write<32, true>(of);
272 #ifdef HAVE_TARGET_64_LITTLE
273 case Parameters::TARGET_64_LITTLE:
274 this->do_sized_write<64, false>(of);
277 #ifdef HAVE_TARGET_64_BIG
278 case Parameters::TARGET_64_BIG:
279 this->do_sized_write<64, true>(of);
287 template<int size, bool big_endian>
289 Output_segment_headers::do_sized_write(Output_file* of)
291 const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
292 off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
293 gold_assert(all_phdrs_size == this->data_size());
294 unsigned char* view = of->get_output_view(this->offset(),
296 unsigned char* v = view;
297 for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
298 p != this->segment_list_.end();
301 elfcpp::Phdr_write<size, big_endian> ophdr(v);
302 (*p)->write_header(&ophdr);
306 gold_assert(v - view == all_phdrs_size);
308 of->write_output_view(this->offset(), all_phdrs_size, view);
311 // Output_file_header methods.
313 Output_file_header::Output_file_header(const Target* target,
314 const Symbol_table* symtab,
315 const Output_segment_headers* osh,
319 segment_header_(osh),
320 section_header_(NULL),
324 const int size = parameters->target().get_size();
327 ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
329 ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
333 this->set_data_size(ehdr_size);
336 // Set the section table information for a file header.
339 Output_file_header::set_section_info(const Output_section_headers* shdrs,
340 const Output_section* shstrtab)
342 this->section_header_ = shdrs;
343 this->shstrtab_ = shstrtab;
346 // Write out the file header.
349 Output_file_header::do_write(Output_file* of)
351 gold_assert(this->offset() == 0);
353 switch (parameters->size_and_endianness())
355 #ifdef HAVE_TARGET_32_LITTLE
356 case Parameters::TARGET_32_LITTLE:
357 this->do_sized_write<32, false>(of);
360 #ifdef HAVE_TARGET_32_BIG
361 case Parameters::TARGET_32_BIG:
362 this->do_sized_write<32, true>(of);
365 #ifdef HAVE_TARGET_64_LITTLE
366 case Parameters::TARGET_64_LITTLE:
367 this->do_sized_write<64, false>(of);
370 #ifdef HAVE_TARGET_64_BIG
371 case Parameters::TARGET_64_BIG:
372 this->do_sized_write<64, true>(of);
380 // Write out the file header with appropriate size and endianess.
382 template<int size, bool big_endian>
384 Output_file_header::do_sized_write(Output_file* of)
386 gold_assert(this->offset() == 0);
388 int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
389 unsigned char* view = of->get_output_view(0, ehdr_size);
390 elfcpp::Ehdr_write<size, big_endian> oehdr(view);
392 unsigned char e_ident[elfcpp::EI_NIDENT];
393 memset(e_ident, 0, elfcpp::EI_NIDENT);
394 e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
395 e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
396 e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
397 e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
399 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
401 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
404 e_ident[elfcpp::EI_DATA] = (big_endian
405 ? elfcpp::ELFDATA2MSB
406 : elfcpp::ELFDATA2LSB);
407 e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
408 // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
409 oehdr.put_e_ident(e_ident);
412 if (parameters->options().relocatable())
413 e_type = elfcpp::ET_REL;
414 else if (parameters->options().shared())
415 e_type = elfcpp::ET_DYN;
417 e_type = elfcpp::ET_EXEC;
418 oehdr.put_e_type(e_type);
420 oehdr.put_e_machine(this->target_->machine_code());
421 oehdr.put_e_version(elfcpp::EV_CURRENT);
423 oehdr.put_e_entry(this->entry<size>());
425 if (this->segment_header_ == NULL)
426 oehdr.put_e_phoff(0);
428 oehdr.put_e_phoff(this->segment_header_->offset());
430 oehdr.put_e_shoff(this->section_header_->offset());
432 // FIXME: The target needs to set the flags.
433 oehdr.put_e_flags(0);
435 oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
437 if (this->segment_header_ == NULL)
439 oehdr.put_e_phentsize(0);
440 oehdr.put_e_phnum(0);
444 oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
445 oehdr.put_e_phnum(this->segment_header_->data_size()
446 / elfcpp::Elf_sizes<size>::phdr_size);
449 oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
450 oehdr.put_e_shnum(this->section_header_->data_size()
451 / elfcpp::Elf_sizes<size>::shdr_size);
452 oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
454 of->write_output_view(0, ehdr_size, view);
457 // Return the value to use for the entry address. THIS->ENTRY_ is the
458 // symbol specified on the command line, if any.
461 typename elfcpp::Elf_types<size>::Elf_Addr
462 Output_file_header::entry()
464 const bool should_issue_warning = (this->entry_ != NULL
465 && !parameters->options().relocatable()
466 && !parameters->options().shared());
468 // FIXME: Need to support target specific entry symbol.
469 const char* entry = this->entry_;
473 Symbol* sym = this->symtab_->lookup(entry);
475 typename Sized_symbol<size>::Value_type v;
478 Sized_symbol<size>* ssym;
479 ssym = this->symtab_->get_sized_symbol<size>(sym);
480 if (!ssym->is_defined() && should_issue_warning)
481 gold_warning("entry symbol '%s' exists but is not defined", entry);
486 // We couldn't find the entry symbol. See if we can parse it as
487 // a number. This supports, e.g., -e 0x1000.
489 v = strtoull(entry, &endptr, 0);
492 if (should_issue_warning)
493 gold_warning("cannot find entry symbol '%s'", entry);
501 // Output_data_const methods.
504 Output_data_const::do_write(Output_file* of)
506 of->write(this->offset(), this->data_.data(), this->data_.size());
509 // Output_data_const_buffer methods.
512 Output_data_const_buffer::do_write(Output_file* of)
514 of->write(this->offset(), this->p_, this->data_size());
517 // Output_section_data methods.
519 // Record the output section, and set the entry size and such.
522 Output_section_data::set_output_section(Output_section* os)
524 gold_assert(this->output_section_ == NULL);
525 this->output_section_ = os;
526 this->do_adjust_output_section(os);
529 // Return the section index of the output section.
532 Output_section_data::do_out_shndx() const
534 gold_assert(this->output_section_ != NULL);
535 return this->output_section_->out_shndx();
538 // Set the alignment, which means we may need to update the alignment
539 // of the output section.
542 Output_section_data::set_addralign(uint64_t addralign)
544 this->addralign_ = addralign;
545 if (this->output_section_ != NULL
546 && this->output_section_->addralign() < addralign)
547 this->output_section_->set_addralign(addralign);
550 // Output_data_strtab methods.
552 // Set the final data size.
555 Output_data_strtab::set_final_data_size()
557 this->strtab_->set_string_offsets();
558 this->set_data_size(this->strtab_->get_strtab_size());
561 // Write out a string table.
564 Output_data_strtab::do_write(Output_file* of)
566 this->strtab_->write(of, this->offset());
569 // Output_reloc methods.
571 // A reloc against a global symbol.
573 template<bool dynamic, int size, bool big_endian>
574 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
580 : address_(address), local_sym_index_(GSYM_CODE), type_(type),
581 is_relative_(is_relative), is_section_symbol_(false), shndx_(INVALID_CODE)
583 // this->type_ is a bitfield; make sure TYPE fits.
584 gold_assert(this->type_ == type);
585 this->u1_.gsym = gsym;
588 this->set_needs_dynsym_index();
591 template<bool dynamic, int size, bool big_endian>
592 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
599 : address_(address), local_sym_index_(GSYM_CODE), type_(type),
600 is_relative_(is_relative), is_section_symbol_(false), shndx_(shndx)
602 gold_assert(shndx != INVALID_CODE);
603 // this->type_ is a bitfield; make sure TYPE fits.
604 gold_assert(this->type_ == type);
605 this->u1_.gsym = gsym;
606 this->u2_.relobj = relobj;
608 this->set_needs_dynsym_index();
611 // A reloc against a local symbol.
613 template<bool dynamic, int size, bool big_endian>
614 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
615 Sized_relobj<size, big_endian>* relobj,
616 unsigned int local_sym_index,
621 bool is_section_symbol)
622 : address_(address), local_sym_index_(local_sym_index), type_(type),
623 is_relative_(is_relative), is_section_symbol_(is_section_symbol),
626 gold_assert(local_sym_index != GSYM_CODE
627 && local_sym_index != INVALID_CODE);
628 // this->type_ is a bitfield; make sure TYPE fits.
629 gold_assert(this->type_ == type);
630 this->u1_.relobj = relobj;
633 this->set_needs_dynsym_index();
636 template<bool dynamic, int size, bool big_endian>
637 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
638 Sized_relobj<size, big_endian>* relobj,
639 unsigned int local_sym_index,
644 bool is_section_symbol)
645 : address_(address), local_sym_index_(local_sym_index), type_(type),
646 is_relative_(is_relative), is_section_symbol_(is_section_symbol),
649 gold_assert(local_sym_index != GSYM_CODE
650 && local_sym_index != INVALID_CODE);
651 gold_assert(shndx != INVALID_CODE);
652 // this->type_ is a bitfield; make sure TYPE fits.
653 gold_assert(this->type_ == type);
654 this->u1_.relobj = relobj;
655 this->u2_.relobj = relobj;
657 this->set_needs_dynsym_index();
660 // A reloc against the STT_SECTION symbol of an output section.
662 template<bool dynamic, int size, bool big_endian>
663 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
668 : address_(address), local_sym_index_(SECTION_CODE), type_(type),
669 is_relative_(false), is_section_symbol_(true), shndx_(INVALID_CODE)
671 // this->type_ is a bitfield; make sure TYPE fits.
672 gold_assert(this->type_ == type);
676 this->set_needs_dynsym_index();
678 os->set_needs_symtab_index();
681 template<bool dynamic, int size, bool big_endian>
682 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
688 : address_(address), local_sym_index_(SECTION_CODE), type_(type),
689 is_relative_(false), is_section_symbol_(true), shndx_(shndx)
691 gold_assert(shndx != INVALID_CODE);
692 // this->type_ is a bitfield; make sure TYPE fits.
693 gold_assert(this->type_ == type);
695 this->u2_.relobj = relobj;
697 this->set_needs_dynsym_index();
699 os->set_needs_symtab_index();
702 // Record that we need a dynamic symbol index for this relocation.
704 template<bool dynamic, int size, bool big_endian>
706 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
707 set_needs_dynsym_index()
709 if (this->is_relative_)
711 switch (this->local_sym_index_)
717 this->u1_.gsym->set_needs_dynsym_entry();
721 this->u1_.os->set_needs_dynsym_index();
729 const unsigned int lsi = this->local_sym_index_;
730 if (!this->is_section_symbol_)
731 this->u1_.relobj->set_needs_output_dynsym_entry(lsi);
734 section_offset_type dummy;
735 Output_section* os = this->u1_.relobj->output_section(lsi, &dummy);
736 gold_assert(os != NULL);
737 os->set_needs_dynsym_index();
744 // Get the symbol index of a relocation.
746 template<bool dynamic, int size, bool big_endian>
748 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index()
752 switch (this->local_sym_index_)
758 if (this->u1_.gsym == NULL)
761 index = this->u1_.gsym->dynsym_index();
763 index = this->u1_.gsym->symtab_index();
768 index = this->u1_.os->dynsym_index();
770 index = this->u1_.os->symtab_index();
774 // Relocations without symbols use a symbol index of 0.
780 const unsigned int lsi = this->local_sym_index_;
781 if (!this->is_section_symbol_)
784 index = this->u1_.relobj->dynsym_index(lsi);
786 index = this->u1_.relobj->symtab_index(lsi);
790 section_offset_type dummy;
791 Output_section* os = this->u1_.relobj->output_section(lsi, &dummy);
792 gold_assert(os != NULL);
794 index = os->dynsym_index();
796 index = os->symtab_index();
801 gold_assert(index != -1U);
805 // For a local section symbol, get the address of the offset ADDEND
806 // within the input section.
808 template<bool dynamic, int size, bool big_endian>
810 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
811 local_section_offset(Addend addend) const
813 gold_assert(this->local_sym_index_ != GSYM_CODE
814 && this->local_sym_index_ != SECTION_CODE
815 && this->local_sym_index_ != INVALID_CODE
816 && this->is_section_symbol_);
817 const unsigned int lsi = this->local_sym_index_;
818 section_offset_type offset;
819 Output_section* os = this->u1_.relobj->output_section(lsi, &offset);
820 gold_assert(os != NULL);
822 return offset + addend;
823 // This is a merge section.
824 offset = os->output_address(this->u1_.relobj, lsi, addend);
825 gold_assert(offset != -1);
829 // Write out the offset and info fields of a Rel or Rela relocation
832 template<bool dynamic, int size, bool big_endian>
833 template<typename Write_rel>
835 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
838 Address address = this->address_;
839 if (this->shndx_ != INVALID_CODE)
841 section_offset_type off;
842 Output_section* os = this->u2_.relobj->output_section(this->shndx_,
844 gold_assert(os != NULL);
846 address += os->address() + off;
849 address = os->output_address(this->u2_.relobj, this->shndx_,
851 gold_assert(address != -1U);
854 else if (this->u2_.od != NULL)
855 address += this->u2_.od->address();
856 wr->put_r_offset(address);
857 unsigned int sym_index = this->is_relative_ ? 0 : this->get_symbol_index();
858 wr->put_r_info(elfcpp::elf_r_info<size>(sym_index, this->type_));
861 // Write out a Rel relocation.
863 template<bool dynamic, int size, bool big_endian>
865 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write(
866 unsigned char* pov) const
868 elfcpp::Rel_write<size, big_endian> orel(pov);
869 this->write_rel(&orel);
872 // Get the value of the symbol referred to by a Rel relocation.
874 template<bool dynamic, int size, bool big_endian>
875 typename elfcpp::Elf_types<size>::Elf_Addr
876 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::symbol_value(
879 if (this->local_sym_index_ == GSYM_CODE)
881 const Sized_symbol<size>* sym;
882 sym = static_cast<const Sized_symbol<size>*>(this->u1_.gsym);
883 return sym->value() + addend;
885 gold_assert(this->local_sym_index_ != SECTION_CODE
886 && this->local_sym_index_ != INVALID_CODE
887 && !this->is_section_symbol_);
888 const unsigned int lsi = this->local_sym_index_;
889 const Symbol_value<size>* symval = this->u1_.relobj->local_symbol(lsi);
890 return symval->value(this->u1_.relobj, addend);
893 // Write out a Rela relocation.
895 template<bool dynamic, int size, bool big_endian>
897 Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write(
898 unsigned char* pov) const
900 elfcpp::Rela_write<size, big_endian> orel(pov);
901 this->rel_.write_rel(&orel);
902 Addend addend = this->addend_;
903 if (this->rel_.is_relative())
904 addend = this->rel_.symbol_value(addend);
905 else if (this->rel_.is_local_section_symbol())
906 addend = this->rel_.local_section_offset(addend);
907 orel.put_r_addend(addend);
910 // Output_data_reloc_base methods.
912 // Adjust the output section.
914 template<int sh_type, bool dynamic, int size, bool big_endian>
916 Output_data_reloc_base<sh_type, dynamic, size, big_endian>
917 ::do_adjust_output_section(Output_section* os)
919 if (sh_type == elfcpp::SHT_REL)
920 os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
921 else if (sh_type == elfcpp::SHT_RELA)
922 os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
926 os->set_should_link_to_dynsym();
928 os->set_should_link_to_symtab();
931 // Write out relocation data.
933 template<int sh_type, bool dynamic, int size, bool big_endian>
935 Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write(
938 const off_t off = this->offset();
939 const off_t oview_size = this->data_size();
940 unsigned char* const oview = of->get_output_view(off, oview_size);
942 unsigned char* pov = oview;
943 for (typename Relocs::const_iterator p = this->relocs_.begin();
944 p != this->relocs_.end();
951 gold_assert(pov - oview == oview_size);
953 of->write_output_view(off, oview_size, oview);
955 // We no longer need the relocation entries.
956 this->relocs_.clear();
959 // Class Output_relocatable_relocs.
961 template<int sh_type, int size, bool big_endian>
963 Output_relocatable_relocs<sh_type, size, big_endian>::set_final_data_size()
965 this->set_data_size(this->rr_->output_reloc_count()
966 * Reloc_types<sh_type, size, big_endian>::reloc_size);
969 // class Output_data_group.
971 template<int size, bool big_endian>
972 Output_data_group<size, big_endian>::Output_data_group(
973 Sized_relobj<size, big_endian>* relobj,
974 section_size_type entry_count,
975 const elfcpp::Elf_Word* contents)
976 : Output_section_data(entry_count * 4, 4),
979 this->flags_ = elfcpp::Swap<32, big_endian>::readval(contents);
980 for (section_size_type i = 1; i < entry_count; ++i)
982 unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i);
983 this->input_sections_.push_back(shndx);
987 // Write out the section group, which means translating the section
988 // indexes to apply to the output file.
990 template<int size, bool big_endian>
992 Output_data_group<size, big_endian>::do_write(Output_file* of)
994 const off_t off = this->offset();
995 const section_size_type oview_size =
996 convert_to_section_size_type(this->data_size());
997 unsigned char* const oview = of->get_output_view(off, oview_size);
999 elfcpp::Elf_Word* contents = reinterpret_cast<elfcpp::Elf_Word*>(oview);
1000 elfcpp::Swap<32, big_endian>::writeval(contents, this->flags_);
1003 for (std::vector<unsigned int>::const_iterator p =
1004 this->input_sections_.begin();
1005 p != this->input_sections_.end();
1008 section_offset_type dummy;
1009 Output_section* os = this->relobj_->output_section(*p, &dummy);
1011 unsigned int output_shndx;
1013 output_shndx = os->out_shndx();
1016 this->relobj_->error(_("section group retained but "
1017 "group element discarded"));
1021 elfcpp::Swap<32, big_endian>::writeval(contents, output_shndx);
1024 size_t wrote = reinterpret_cast<unsigned char*>(contents) - oview;
1025 gold_assert(wrote == oview_size);
1027 of->write_output_view(off, oview_size, oview);
1029 // We no longer need this information.
1030 this->input_sections_.clear();
1033 // Output_data_got::Got_entry methods.
1035 // Write out the entry.
1037 template<int size, bool big_endian>
1039 Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
1043 switch (this->local_sym_index_)
1047 // If the symbol is resolved locally, we need to write out the
1048 // link-time value, which will be relocated dynamically by a
1049 // RELATIVE relocation.
1050 Symbol* gsym = this->u_.gsym;
1051 Sized_symbol<size>* sgsym;
1052 // This cast is a bit ugly. We don't want to put a
1053 // virtual method in Symbol, because we want Symbol to be
1054 // as small as possible.
1055 sgsym = static_cast<Sized_symbol<size>*>(gsym);
1056 val = sgsym->value();
1061 val = this->u_.constant;
1066 const unsigned int lsi = this->local_sym_index_;
1067 const Symbol_value<size>* symval = this->u_.object->local_symbol(lsi);
1068 val = symval->value(this->u_.object, 0);
1073 elfcpp::Swap<size, big_endian>::writeval(pov, val);
1076 // Output_data_got methods.
1078 // Add an entry for a global symbol to the GOT. This returns true if
1079 // this is a new GOT entry, false if the symbol already had a GOT
1082 template<int size, bool big_endian>
1084 Output_data_got<size, big_endian>::add_global(
1086 unsigned int got_type)
1088 if (gsym->has_got_offset(got_type))
1091 this->entries_.push_back(Got_entry(gsym));
1092 this->set_got_size();
1093 gsym->set_got_offset(got_type, this->last_got_offset());
1097 // Add an entry for a global symbol to the GOT, and add a dynamic
1098 // relocation of type R_TYPE for the GOT entry.
1099 template<int size, bool big_endian>
1101 Output_data_got<size, big_endian>::add_global_with_rel(
1103 unsigned int got_type,
1105 unsigned int r_type)
1107 if (gsym->has_got_offset(got_type))
1110 this->entries_.push_back(Got_entry());
1111 this->set_got_size();
1112 unsigned int got_offset = this->last_got_offset();
1113 gsym->set_got_offset(got_type, got_offset);
1114 rel_dyn->add_global(gsym, r_type, this, got_offset);
1117 template<int size, bool big_endian>
1119 Output_data_got<size, big_endian>::add_global_with_rela(
1121 unsigned int got_type,
1123 unsigned int r_type)
1125 if (gsym->has_got_offset(got_type))
1128 this->entries_.push_back(Got_entry());
1129 this->set_got_size();
1130 unsigned int got_offset = this->last_got_offset();
1131 gsym->set_got_offset(got_type, got_offset);
1132 rela_dyn->add_global(gsym, r_type, this, got_offset, 0);
1135 // Add a pair of entries for a global symbol to the GOT, and add
1136 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1137 // If R_TYPE_2 == 0, add the second entry with no relocation.
1138 template<int size, bool big_endian>
1140 Output_data_got<size, big_endian>::add_global_pair_with_rel(
1142 unsigned int got_type,
1144 unsigned int r_type_1,
1145 unsigned int r_type_2)
1147 if (gsym->has_got_offset(got_type))
1150 this->entries_.push_back(Got_entry());
1151 unsigned int got_offset = this->last_got_offset();
1152 gsym->set_got_offset(got_type, got_offset);
1153 rel_dyn->add_global(gsym, r_type_1, this, got_offset);
1155 this->entries_.push_back(Got_entry());
1158 got_offset = this->last_got_offset();
1159 rel_dyn->add_global(gsym, r_type_2, this, got_offset);
1162 this->set_got_size();
1165 template<int size, bool big_endian>
1167 Output_data_got<size, big_endian>::add_global_pair_with_rela(
1169 unsigned int got_type,
1171 unsigned int r_type_1,
1172 unsigned int r_type_2)
1174 if (gsym->has_got_offset(got_type))
1177 this->entries_.push_back(Got_entry());
1178 unsigned int got_offset = this->last_got_offset();
1179 gsym->set_got_offset(got_type, got_offset);
1180 rela_dyn->add_global(gsym, r_type_1, this, got_offset, 0);
1182 this->entries_.push_back(Got_entry());
1185 got_offset = this->last_got_offset();
1186 rela_dyn->add_global(gsym, r_type_2, this, got_offset, 0);
1189 this->set_got_size();
1192 // Add an entry for a local symbol to the GOT. This returns true if
1193 // this is a new GOT entry, false if the symbol already has a GOT
1196 template<int size, bool big_endian>
1198 Output_data_got<size, big_endian>::add_local(
1199 Sized_relobj<size, big_endian>* object,
1200 unsigned int symndx,
1201 unsigned int got_type)
1203 if (object->local_has_got_offset(symndx, got_type))
1206 this->entries_.push_back(Got_entry(object, symndx));
1207 this->set_got_size();
1208 object->set_local_got_offset(symndx, got_type, this->last_got_offset());
1212 // Add an entry for a local symbol to the GOT, and add a dynamic
1213 // relocation of type R_TYPE for the GOT entry.
1214 template<int size, bool big_endian>
1216 Output_data_got<size, big_endian>::add_local_with_rel(
1217 Sized_relobj<size, big_endian>* object,
1218 unsigned int symndx,
1219 unsigned int got_type,
1221 unsigned int r_type)
1223 if (object->local_has_got_offset(symndx, got_type))
1226 this->entries_.push_back(Got_entry());
1227 this->set_got_size();
1228 unsigned int got_offset = this->last_got_offset();
1229 object->set_local_got_offset(symndx, got_type, got_offset);
1230 rel_dyn->add_local(object, symndx, r_type, this, got_offset);
1233 template<int size, bool big_endian>
1235 Output_data_got<size, big_endian>::add_local_with_rela(
1236 Sized_relobj<size, big_endian>* object,
1237 unsigned int symndx,
1238 unsigned int got_type,
1240 unsigned int r_type)
1242 if (object->local_has_got_offset(symndx, got_type))
1245 this->entries_.push_back(Got_entry());
1246 this->set_got_size();
1247 unsigned int got_offset = this->last_got_offset();
1248 object->set_local_got_offset(symndx, got_type, got_offset);
1249 rela_dyn->add_local(object, symndx, r_type, this, got_offset, 0);
1252 // Add a pair of entries for a local symbol to the GOT, and add
1253 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1254 // If R_TYPE_2 == 0, add the second entry with no relocation.
1255 template<int size, bool big_endian>
1257 Output_data_got<size, big_endian>::add_local_pair_with_rel(
1258 Sized_relobj<size, big_endian>* object,
1259 unsigned int symndx,
1261 unsigned int got_type,
1263 unsigned int r_type_1,
1264 unsigned int r_type_2)
1266 if (object->local_has_got_offset(symndx, got_type))
1269 this->entries_.push_back(Got_entry());
1270 unsigned int got_offset = this->last_got_offset();
1271 object->set_local_got_offset(symndx, got_type, got_offset);
1272 section_offset_type off;
1273 Output_section* os = object->output_section(shndx, &off);
1274 rel_dyn->add_output_section(os, r_type_1, this, got_offset);
1276 this->entries_.push_back(Got_entry(object, symndx));
1279 got_offset = this->last_got_offset();
1280 rel_dyn->add_output_section(os, r_type_2, this, got_offset);
1283 this->set_got_size();
1286 template<int size, bool big_endian>
1288 Output_data_got<size, big_endian>::add_local_pair_with_rela(
1289 Sized_relobj<size, big_endian>* object,
1290 unsigned int symndx,
1292 unsigned int got_type,
1294 unsigned int r_type_1,
1295 unsigned int r_type_2)
1297 if (object->local_has_got_offset(symndx, got_type))
1300 this->entries_.push_back(Got_entry());
1301 unsigned int got_offset = this->last_got_offset();
1302 object->set_local_got_offset(symndx, got_type, got_offset);
1303 section_offset_type off;
1304 Output_section* os = object->output_section(shndx, &off);
1305 rela_dyn->add_output_section(os, r_type_1, this, got_offset, 0);
1307 this->entries_.push_back(Got_entry(object, symndx));
1310 got_offset = this->last_got_offset();
1311 rela_dyn->add_output_section(os, r_type_2, this, got_offset, 0);
1314 this->set_got_size();
1317 // Write out the GOT.
1319 template<int size, bool big_endian>
1321 Output_data_got<size, big_endian>::do_write(Output_file* of)
1323 const int add = size / 8;
1325 const off_t off = this->offset();
1326 const off_t oview_size = this->data_size();
1327 unsigned char* const oview = of->get_output_view(off, oview_size);
1329 unsigned char* pov = oview;
1330 for (typename Got_entries::const_iterator p = this->entries_.begin();
1331 p != this->entries_.end();
1338 gold_assert(pov - oview == oview_size);
1340 of->write_output_view(off, oview_size, oview);
1342 // We no longer need the GOT entries.
1343 this->entries_.clear();
1346 // Output_data_dynamic::Dynamic_entry methods.
1348 // Write out the entry.
1350 template<int size, bool big_endian>
1352 Output_data_dynamic::Dynamic_entry::write(
1354 const Stringpool* pool) const
1356 typename elfcpp::Elf_types<size>::Elf_WXword val;
1357 switch (this->offset_)
1359 case DYNAMIC_NUMBER:
1363 case DYNAMIC_SECTION_SIZE:
1364 val = this->u_.od->data_size();
1367 case DYNAMIC_SYMBOL:
1369 const Sized_symbol<size>* s =
1370 static_cast<const Sized_symbol<size>*>(this->u_.sym);
1375 case DYNAMIC_STRING:
1376 val = pool->get_offset(this->u_.str);
1380 val = this->u_.od->address() + this->offset_;
1384 elfcpp::Dyn_write<size, big_endian> dw(pov);
1385 dw.put_d_tag(this->tag_);
1389 // Output_data_dynamic methods.
1391 // Adjust the output section to set the entry size.
1394 Output_data_dynamic::do_adjust_output_section(Output_section* os)
1396 if (parameters->target().get_size() == 32)
1397 os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
1398 else if (parameters->target().get_size() == 64)
1399 os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
1404 // Set the final data size.
1407 Output_data_dynamic::set_final_data_size()
1409 // Add the terminating entry.
1410 this->add_constant(elfcpp::DT_NULL, 0);
1413 if (parameters->target().get_size() == 32)
1414 dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
1415 else if (parameters->target().get_size() == 64)
1416 dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
1419 this->set_data_size(this->entries_.size() * dyn_size);
1422 // Write out the dynamic entries.
1425 Output_data_dynamic::do_write(Output_file* of)
1427 switch (parameters->size_and_endianness())
1429 #ifdef HAVE_TARGET_32_LITTLE
1430 case Parameters::TARGET_32_LITTLE:
1431 this->sized_write<32, false>(of);
1434 #ifdef HAVE_TARGET_32_BIG
1435 case Parameters::TARGET_32_BIG:
1436 this->sized_write<32, true>(of);
1439 #ifdef HAVE_TARGET_64_LITTLE
1440 case Parameters::TARGET_64_LITTLE:
1441 this->sized_write<64, false>(of);
1444 #ifdef HAVE_TARGET_64_BIG
1445 case Parameters::TARGET_64_BIG:
1446 this->sized_write<64, true>(of);
1454 template<int size, bool big_endian>
1456 Output_data_dynamic::sized_write(Output_file* of)
1458 const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
1460 const off_t offset = this->offset();
1461 const off_t oview_size = this->data_size();
1462 unsigned char* const oview = of->get_output_view(offset, oview_size);
1464 unsigned char* pov = oview;
1465 for (typename Dynamic_entries::const_iterator p = this->entries_.begin();
1466 p != this->entries_.end();
1469 p->write<size, big_endian>(pov, this->pool_);
1473 gold_assert(pov - oview == oview_size);
1475 of->write_output_view(offset, oview_size, oview);
1477 // We no longer need the dynamic entries.
1478 this->entries_.clear();
1481 // Output_section::Input_section methods.
1483 // Return the data size. For an input section we store the size here.
1484 // For an Output_section_data, we have to ask it for the size.
1487 Output_section::Input_section::data_size() const
1489 if (this->is_input_section())
1490 return this->u1_.data_size;
1492 return this->u2_.posd->data_size();
1495 // Set the address and file offset.
1498 Output_section::Input_section::set_address_and_file_offset(
1501 off_t section_file_offset)
1503 if (this->is_input_section())
1504 this->u2_.object->set_section_offset(this->shndx_,
1505 file_offset - section_file_offset);
1507 this->u2_.posd->set_address_and_file_offset(address, file_offset);
1510 // Reset the address and file offset.
1513 Output_section::Input_section::reset_address_and_file_offset()
1515 if (!this->is_input_section())
1516 this->u2_.posd->reset_address_and_file_offset();
1519 // Finalize the data size.
1522 Output_section::Input_section::finalize_data_size()
1524 if (!this->is_input_section())
1525 this->u2_.posd->finalize_data_size();
1528 // Try to turn an input offset into an output offset. We want to
1529 // return the output offset relative to the start of this
1530 // Input_section in the output section.
1533 Output_section::Input_section::output_offset(
1534 const Relobj* object,
1536 section_offset_type offset,
1537 section_offset_type *poutput) const
1539 if (!this->is_input_section())
1540 return this->u2_.posd->output_offset(object, shndx, offset, poutput);
1543 if (this->shndx_ != shndx || this->u2_.object != object)
1550 // Return whether this is the merge section for the input section
1554 Output_section::Input_section::is_merge_section_for(const Relobj* object,
1555 unsigned int shndx) const
1557 if (this->is_input_section())
1559 return this->u2_.posd->is_merge_section_for(object, shndx);
1562 // Write out the data. We don't have to do anything for an input
1563 // section--they are handled via Object::relocate--but this is where
1564 // we write out the data for an Output_section_data.
1567 Output_section::Input_section::write(Output_file* of)
1569 if (!this->is_input_section())
1570 this->u2_.posd->write(of);
1573 // Write the data to a buffer. As for write(), we don't have to do
1574 // anything for an input section.
1577 Output_section::Input_section::write_to_buffer(unsigned char* buffer)
1579 if (!this->is_input_section())
1580 this->u2_.posd->write_to_buffer(buffer);
1583 // Output_section methods.
1585 // Construct an Output_section. NAME will point into a Stringpool.
1587 Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
1588 elfcpp::Elf_Xword flags)
1593 link_section_(NULL),
1595 info_section_(NULL),
1604 first_input_offset_(0),
1606 postprocessing_buffer_(NULL),
1607 needs_symtab_index_(false),
1608 needs_dynsym_index_(false),
1609 should_link_to_symtab_(false),
1610 should_link_to_dynsym_(false),
1611 after_input_sections_(false),
1612 requires_postprocessing_(false),
1613 found_in_sections_clause_(false),
1614 has_load_address_(false),
1615 info_uses_section_index_(false),
1616 may_sort_attached_input_sections_(false),
1617 must_sort_attached_input_sections_(false),
1618 attached_input_sections_are_sorted_(false),
1621 // An unallocated section has no address. Forcing this means that
1622 // we don't need special treatment for symbols defined in debug
1624 if ((flags & elfcpp::SHF_ALLOC) == 0)
1625 this->set_address(0);
1628 Output_section::~Output_section()
1632 // Set the entry size.
1635 Output_section::set_entsize(uint64_t v)
1637 if (this->entsize_ == 0)
1640 gold_assert(this->entsize_ == v);
1643 // Add the input section SHNDX, with header SHDR, named SECNAME, in
1644 // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
1645 // relocation section which applies to this section, or 0 if none, or
1646 // -1U if more than one. Return the offset of the input section
1647 // within the output section. Return -1 if the input section will
1648 // receive special handling. In the normal case we don't always keep
1649 // track of input sections for an Output_section. Instead, each
1650 // Object keeps track of the Output_section for each of its input
1651 // sections. However, if HAVE_SECTIONS_SCRIPT is true, we do keep
1652 // track of input sections here; this is used when SECTIONS appears in
1655 template<int size, bool big_endian>
1657 Output_section::add_input_section(Sized_relobj<size, big_endian>* object,
1659 const char* secname,
1660 const elfcpp::Shdr<size, big_endian>& shdr,
1661 unsigned int reloc_shndx,
1662 bool have_sections_script)
1664 elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
1665 if ((addralign & (addralign - 1)) != 0)
1667 object->error(_("invalid alignment %lu for section \"%s\""),
1668 static_cast<unsigned long>(addralign), secname);
1672 if (addralign > this->addralign_)
1673 this->addralign_ = addralign;
1675 typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags();
1676 this->update_flags_for_input_section(sh_flags);
1678 uint64_t entsize = shdr.get_sh_entsize();
1680 // .debug_str is a mergeable string section, but is not always so
1681 // marked by compilers. Mark manually here so we can optimize.
1682 if (strcmp(secname, ".debug_str") == 0)
1684 sh_flags |= (elfcpp::SHF_MERGE | elfcpp::SHF_STRINGS);
1688 // If this is a SHF_MERGE section, we pass all the input sections to
1689 // a Output_data_merge. We don't try to handle relocations for such
1691 if ((sh_flags & elfcpp::SHF_MERGE) != 0
1692 && reloc_shndx == 0)
1694 if (this->add_merge_input_section(object, shndx, sh_flags,
1695 entsize, addralign))
1697 // Tell the relocation routines that they need to call the
1698 // output_offset method to determine the final address.
1703 off_t offset_in_section = this->current_data_size_for_child();
1704 off_t aligned_offset_in_section = align_address(offset_in_section,
1707 if (aligned_offset_in_section > offset_in_section
1708 && !have_sections_script
1709 && (sh_flags & elfcpp::SHF_EXECINSTR) != 0
1710 && object->target()->has_code_fill())
1712 // We need to add some fill data. Using fill_list_ when
1713 // possible is an optimization, since we will often have fill
1714 // sections without input sections.
1715 off_t fill_len = aligned_offset_in_section - offset_in_section;
1716 if (this->input_sections_.empty())
1717 this->fills_.push_back(Fill(offset_in_section, fill_len));
1720 // FIXME: When relaxing, the size needs to adjust to
1721 // maintain a constant alignment.
1722 std::string fill_data(object->target()->code_fill(fill_len));
1723 Output_data_const* odc = new Output_data_const(fill_data, 1);
1724 this->input_sections_.push_back(Input_section(odc));
1728 this->set_current_data_size_for_child(aligned_offset_in_section
1729 + shdr.get_sh_size());
1731 // We need to keep track of this section if we are already keeping
1732 // track of sections, or if we are relaxing. Also, if this is a
1733 // section which requires sorting, or which may require sorting in
1734 // the future, we keep track of the sections. FIXME: Add test for
1736 if (have_sections_script
1737 || !this->input_sections_.empty()
1738 || this->may_sort_attached_input_sections()
1739 || this->must_sort_attached_input_sections())
1740 this->input_sections_.push_back(Input_section(object, shndx,
1744 return aligned_offset_in_section;
1747 // Add arbitrary data to an output section.
1750 Output_section::add_output_section_data(Output_section_data* posd)
1752 Input_section inp(posd);
1753 this->add_output_section_data(&inp);
1755 if (posd->is_data_size_valid())
1757 off_t offset_in_section = this->current_data_size_for_child();
1758 off_t aligned_offset_in_section = align_address(offset_in_section,
1760 this->set_current_data_size_for_child(aligned_offset_in_section
1761 + posd->data_size());
1765 // Add arbitrary data to an output section by Input_section.
1768 Output_section::add_output_section_data(Input_section* inp)
1770 if (this->input_sections_.empty())
1771 this->first_input_offset_ = this->current_data_size_for_child();
1773 this->input_sections_.push_back(*inp);
1775 uint64_t addralign = inp->addralign();
1776 if (addralign > this->addralign_)
1777 this->addralign_ = addralign;
1779 inp->set_output_section(this);
1782 // Add a merge section to an output section.
1785 Output_section::add_output_merge_section(Output_section_data* posd,
1786 bool is_string, uint64_t entsize)
1788 Input_section inp(posd, is_string, entsize);
1789 this->add_output_section_data(&inp);
1792 // Add an input section to a SHF_MERGE section.
1795 Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
1796 uint64_t flags, uint64_t entsize,
1799 bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
1801 // We only merge strings if the alignment is not more than the
1802 // character size. This could be handled, but it's unusual.
1803 if (is_string && addralign > entsize)
1806 Input_section_list::iterator p;
1807 for (p = this->input_sections_.begin();
1808 p != this->input_sections_.end();
1810 if (p->is_merge_section(is_string, entsize, addralign))
1812 p->add_input_section(object, shndx);
1816 // We handle the actual constant merging in Output_merge_data or
1817 // Output_merge_string_data.
1818 Output_section_data* posd;
1820 posd = new Output_merge_data(entsize, addralign);
1826 posd = new Output_merge_string<char>(addralign);
1829 posd = new Output_merge_string<uint16_t>(addralign);
1832 posd = new Output_merge_string<uint32_t>(addralign);
1839 this->add_output_merge_section(posd, is_string, entsize);
1840 posd->add_input_section(object, shndx);
1845 // Given an address OFFSET relative to the start of input section
1846 // SHNDX in OBJECT, return whether this address is being included in
1847 // the final link. This should only be called if SHNDX in OBJECT has
1848 // a special mapping.
1851 Output_section::is_input_address_mapped(const Relobj* object,
1855 gold_assert(object->is_section_specially_mapped(shndx));
1857 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1858 p != this->input_sections_.end();
1861 section_offset_type output_offset;
1862 if (p->output_offset(object, shndx, offset, &output_offset))
1863 return output_offset != -1;
1866 // By default we assume that the address is mapped. This should
1867 // only be called after we have passed all sections to Layout. At
1868 // that point we should know what we are discarding.
1872 // Given an address OFFSET relative to the start of input section
1873 // SHNDX in object OBJECT, return the output offset relative to the
1874 // start of the input section in the output section. This should only
1875 // be called if SHNDX in OBJECT has a special mapping.
1878 Output_section::output_offset(const Relobj* object, unsigned int shndx,
1879 section_offset_type offset) const
1881 gold_assert(object->is_section_specially_mapped(shndx));
1882 // This can only be called meaningfully when layout is complete.
1883 gold_assert(Output_data::is_layout_complete());
1885 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1886 p != this->input_sections_.end();
1889 section_offset_type output_offset;
1890 if (p->output_offset(object, shndx, offset, &output_offset))
1891 return output_offset;
1896 // Return the output virtual address of OFFSET relative to the start
1897 // of input section SHNDX in object OBJECT.
1900 Output_section::output_address(const Relobj* object, unsigned int shndx,
1903 gold_assert(object->is_section_specially_mapped(shndx));
1905 uint64_t addr = this->address() + this->first_input_offset_;
1906 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1907 p != this->input_sections_.end();
1910 addr = align_address(addr, p->addralign());
1911 section_offset_type output_offset;
1912 if (p->output_offset(object, shndx, offset, &output_offset))
1914 if (output_offset == -1)
1916 return addr + output_offset;
1918 addr += p->data_size();
1921 // If we get here, it means that we don't know the mapping for this
1922 // input section. This might happen in principle if
1923 // add_input_section were called before add_output_section_data.
1924 // But it should never actually happen.
1929 // Return the output address of the start of the merged section for
1930 // input section SHNDX in object OBJECT.
1933 Output_section::starting_output_address(const Relobj* object,
1934 unsigned int shndx) const
1936 gold_assert(object->is_section_specially_mapped(shndx));
1938 uint64_t addr = this->address() + this->first_input_offset_;
1939 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1940 p != this->input_sections_.end();
1943 addr = align_address(addr, p->addralign());
1945 // It would be nice if we could use the existing output_offset
1946 // method to get the output offset of input offset 0.
1947 // Unfortunately we don't know for sure that input offset 0 is
1949 if (p->is_merge_section_for(object, shndx))
1952 addr += p->data_size();
1957 // Set the data size of an Output_section. This is where we handle
1958 // setting the addresses of any Output_section_data objects.
1961 Output_section::set_final_data_size()
1963 if (this->input_sections_.empty())
1965 this->set_data_size(this->current_data_size_for_child());
1969 if (this->must_sort_attached_input_sections())
1970 this->sort_attached_input_sections();
1972 uint64_t address = this->address();
1973 off_t startoff = this->offset();
1974 off_t off = startoff + this->first_input_offset_;
1975 for (Input_section_list::iterator p = this->input_sections_.begin();
1976 p != this->input_sections_.end();
1979 off = align_address(off, p->addralign());
1980 p->set_address_and_file_offset(address + (off - startoff), off,
1982 off += p->data_size();
1985 this->set_data_size(off - startoff);
1988 // Reset the address and file offset.
1991 Output_section::do_reset_address_and_file_offset()
1993 for (Input_section_list::iterator p = this->input_sections_.begin();
1994 p != this->input_sections_.end();
1996 p->reset_address_and_file_offset();
1999 // Set the TLS offset. Called only for SHT_TLS sections.
2002 Output_section::do_set_tls_offset(uint64_t tls_base)
2004 this->tls_offset_ = this->address() - tls_base;
2007 // In a few cases we need to sort the input sections attached to an
2008 // output section. This is used to implement the type of constructor
2009 // priority ordering implemented by the GNU linker, in which the
2010 // priority becomes part of the section name and the sections are
2011 // sorted by name. We only do this for an output section if we see an
2012 // attached input section matching ".ctor.*", ".dtor.*",
2013 // ".init_array.*" or ".fini_array.*".
2015 class Output_section::Input_section_sort_entry
2018 Input_section_sort_entry()
2019 : input_section_(), index_(-1U), section_has_name_(false),
2023 Input_section_sort_entry(const Input_section& input_section,
2025 : input_section_(input_section), index_(index),
2026 section_has_name_(input_section.is_input_section())
2028 if (this->section_has_name_)
2030 // This is only called single-threaded from Layout::finalize,
2031 // so it is OK to lock. Unfortunately we have no way to pass
2033 const Task* dummy_task = reinterpret_cast<const Task*>(-1);
2034 Object* obj = input_section.relobj();
2035 Task_lock_obj<Object> tl(dummy_task, obj);
2037 // This is a slow operation, which should be cached in
2038 // Layout::layout if this becomes a speed problem.
2039 this->section_name_ = obj->section_name(input_section.shndx());
2043 // Return the Input_section.
2044 const Input_section&
2045 input_section() const
2047 gold_assert(this->index_ != -1U);
2048 return this->input_section_;
2051 // The index of this entry in the original list. This is used to
2052 // make the sort stable.
2056 gold_assert(this->index_ != -1U);
2057 return this->index_;
2060 // Whether there is a section name.
2062 section_has_name() const
2063 { return this->section_has_name_; }
2065 // The section name.
2067 section_name() const
2069 gold_assert(this->section_has_name_);
2070 return this->section_name_;
2073 // Return true if the section name has a priority. This is assumed
2074 // to be true if it has a dot after the initial dot.
2076 has_priority() const
2078 gold_assert(this->section_has_name_);
2079 return this->section_name_.find('.', 1);
2082 // Return true if this an input file whose base name matches
2083 // FILE_NAME. The base name must have an extension of ".o", and
2084 // must be exactly FILE_NAME.o or FILE_NAME, one character, ".o".
2085 // This is to match crtbegin.o as well as crtbeginS.o without
2086 // getting confused by other possibilities. Overall matching the
2087 // file name this way is a dreadful hack, but the GNU linker does it
2088 // in order to better support gcc, and we need to be compatible.
2090 match_file_name(const char* match_file_name) const
2092 const std::string& file_name(this->input_section_.relobj()->name());
2093 const char* base_name = lbasename(file_name.c_str());
2094 size_t match_len = strlen(match_file_name);
2095 if (strncmp(base_name, match_file_name, match_len) != 0)
2097 size_t base_len = strlen(base_name);
2098 if (base_len != match_len + 2 && base_len != match_len + 3)
2100 return memcmp(base_name + base_len - 2, ".o", 2) == 0;
2104 // The Input_section we are sorting.
2105 Input_section input_section_;
2106 // The index of this Input_section in the original list.
2107 unsigned int index_;
2108 // Whether this Input_section has a section name--it won't if this
2109 // is some random Output_section_data.
2110 bool section_has_name_;
2111 // The section name if there is one.
2112 std::string section_name_;
2115 // Return true if S1 should come before S2 in the output section.
2118 Output_section::Input_section_sort_compare::operator()(
2119 const Output_section::Input_section_sort_entry& s1,
2120 const Output_section::Input_section_sort_entry& s2) const
2122 // crtbegin.o must come first.
2123 bool s1_begin = s1.match_file_name("crtbegin");
2124 bool s2_begin = s2.match_file_name("crtbegin");
2125 if (s1_begin || s2_begin)
2131 return s1.index() < s2.index();
2134 // crtend.o must come last.
2135 bool s1_end = s1.match_file_name("crtend");
2136 bool s2_end = s2.match_file_name("crtend");
2137 if (s1_end || s2_end)
2143 return s1.index() < s2.index();
2146 // We sort all the sections with no names to the end.
2147 if (!s1.section_has_name() || !s2.section_has_name())
2149 if (s1.section_has_name())
2151 if (s2.section_has_name())
2153 return s1.index() < s2.index();
2156 // A section with a priority follows a section without a priority.
2157 // The GNU linker does this for all but .init_array sections; until
2158 // further notice we'll assume that that is an mistake.
2159 bool s1_has_priority = s1.has_priority();
2160 bool s2_has_priority = s2.has_priority();
2161 if (s1_has_priority && !s2_has_priority)
2163 if (!s1_has_priority && s2_has_priority)
2166 // Otherwise we sort by name.
2167 int compare = s1.section_name().compare(s2.section_name());
2171 // Otherwise we keep the input order.
2172 return s1.index() < s2.index();
2175 // Sort the input sections attached to an output section.
2178 Output_section::sort_attached_input_sections()
2180 if (this->attached_input_sections_are_sorted_)
2183 // The only thing we know about an input section is the object and
2184 // the section index. We need the section name. Recomputing this
2185 // is slow but this is an unusual case. If this becomes a speed
2186 // problem we can cache the names as required in Layout::layout.
2188 // We start by building a larger vector holding a copy of each
2189 // Input_section, plus its current index in the list and its name.
2190 std::vector<Input_section_sort_entry> sort_list;
2193 for (Input_section_list::iterator p = this->input_sections_.begin();
2194 p != this->input_sections_.end();
2196 sort_list.push_back(Input_section_sort_entry(*p, i));
2198 // Sort the input sections.
2199 std::sort(sort_list.begin(), sort_list.end(), Input_section_sort_compare());
2201 // Copy the sorted input sections back to our list.
2202 this->input_sections_.clear();
2203 for (std::vector<Input_section_sort_entry>::iterator p = sort_list.begin();
2204 p != sort_list.end();
2206 this->input_sections_.push_back(p->input_section());
2208 // Remember that we sorted the input sections, since we might get
2210 this->attached_input_sections_are_sorted_ = true;
2213 // Write the section header to *OSHDR.
2215 template<int size, bool big_endian>
2217 Output_section::write_header(const Layout* layout,
2218 const Stringpool* secnamepool,
2219 elfcpp::Shdr_write<size, big_endian>* oshdr) const
2221 oshdr->put_sh_name(secnamepool->get_offset(this->name_));
2222 oshdr->put_sh_type(this->type_);
2224 elfcpp::Elf_Xword flags = this->flags_;
2225 if (this->info_section_ != NULL && this->info_uses_section_index_)
2226 flags |= elfcpp::SHF_INFO_LINK;
2227 oshdr->put_sh_flags(flags);
2229 oshdr->put_sh_addr(this->address());
2230 oshdr->put_sh_offset(this->offset());
2231 oshdr->put_sh_size(this->data_size());
2232 if (this->link_section_ != NULL)
2233 oshdr->put_sh_link(this->link_section_->out_shndx());
2234 else if (this->should_link_to_symtab_)
2235 oshdr->put_sh_link(layout->symtab_section()->out_shndx());
2236 else if (this->should_link_to_dynsym_)
2237 oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
2239 oshdr->put_sh_link(this->link_);
2241 elfcpp::Elf_Word info;
2242 if (this->info_section_ != NULL)
2244 if (this->info_uses_section_index_)
2245 info = this->info_section_->out_shndx();
2247 info = this->info_section_->symtab_index();
2249 else if (this->info_symndx_ != NULL)
2250 info = this->info_symndx_->symtab_index();
2253 oshdr->put_sh_info(info);
2255 oshdr->put_sh_addralign(this->addralign_);
2256 oshdr->put_sh_entsize(this->entsize_);
2259 // Write out the data. For input sections the data is written out by
2260 // Object::relocate, but we have to handle Output_section_data objects
2264 Output_section::do_write(Output_file* of)
2266 gold_assert(!this->requires_postprocessing());
2268 off_t output_section_file_offset = this->offset();
2269 for (Fill_list::iterator p = this->fills_.begin();
2270 p != this->fills_.end();
2273 std::string fill_data(parameters->target().code_fill(p->length()));
2274 of->write(output_section_file_offset + p->section_offset(),
2275 fill_data.data(), fill_data.size());
2278 for (Input_section_list::iterator p = this->input_sections_.begin();
2279 p != this->input_sections_.end();
2284 // If a section requires postprocessing, create the buffer to use.
2287 Output_section::create_postprocessing_buffer()
2289 gold_assert(this->requires_postprocessing());
2291 if (this->postprocessing_buffer_ != NULL)
2294 if (!this->input_sections_.empty())
2296 off_t off = this->first_input_offset_;
2297 for (Input_section_list::iterator p = this->input_sections_.begin();
2298 p != this->input_sections_.end();
2301 off = align_address(off, p->addralign());
2302 p->finalize_data_size();
2303 off += p->data_size();
2305 this->set_current_data_size_for_child(off);
2308 off_t buffer_size = this->current_data_size_for_child();
2309 this->postprocessing_buffer_ = new unsigned char[buffer_size];
2312 // Write all the data of an Output_section into the postprocessing
2313 // buffer. This is used for sections which require postprocessing,
2314 // such as compression. Input sections are handled by
2315 // Object::Relocate.
2318 Output_section::write_to_postprocessing_buffer()
2320 gold_assert(this->requires_postprocessing());
2322 unsigned char* buffer = this->postprocessing_buffer();
2323 for (Fill_list::iterator p = this->fills_.begin();
2324 p != this->fills_.end();
2327 std::string fill_data(parameters->target().code_fill(p->length()));
2328 memcpy(buffer + p->section_offset(), fill_data.data(),
2332 off_t off = this->first_input_offset_;
2333 for (Input_section_list::iterator p = this->input_sections_.begin();
2334 p != this->input_sections_.end();
2337 off = align_address(off, p->addralign());
2338 p->write_to_buffer(buffer + off);
2339 off += p->data_size();
2343 // Get the input sections for linker script processing. We leave
2344 // behind the Output_section_data entries. Note that this may be
2345 // slightly incorrect for merge sections. We will leave them behind,
2346 // but it is possible that the script says that they should follow
2347 // some other input sections, as in:
2348 // .rodata { *(.rodata) *(.rodata.cst*) }
2349 // For that matter, we don't handle this correctly:
2350 // .rodata { foo.o(.rodata.cst*) *(.rodata.cst*) }
2351 // With luck this will never matter.
2354 Output_section::get_input_sections(
2356 const std::string& fill,
2357 std::list<std::pair<Relobj*, unsigned int> >* input_sections)
2359 uint64_t orig_address = address;
2361 address = align_address(address, this->addralign());
2363 Input_section_list remaining;
2364 for (Input_section_list::iterator p = this->input_sections_.begin();
2365 p != this->input_sections_.end();
2368 if (p->is_input_section())
2369 input_sections->push_back(std::make_pair(p->relobj(), p->shndx()));
2372 uint64_t aligned_address = align_address(address, p->addralign());
2373 if (aligned_address != address && !fill.empty())
2375 section_size_type length =
2376 convert_to_section_size_type(aligned_address - address);
2377 std::string this_fill;
2378 this_fill.reserve(length);
2379 while (this_fill.length() + fill.length() <= length)
2381 if (this_fill.length() < length)
2382 this_fill.append(fill, 0, length - this_fill.length());
2384 Output_section_data* posd = new Output_data_const(this_fill, 0);
2385 remaining.push_back(Input_section(posd));
2387 address = aligned_address;
2389 remaining.push_back(*p);
2391 p->finalize_data_size();
2392 address += p->data_size();
2396 this->input_sections_.swap(remaining);
2397 this->first_input_offset_ = 0;
2399 uint64_t data_size = address - orig_address;
2400 this->set_current_data_size_for_child(data_size);
2404 // Add an input section from a script.
2407 Output_section::add_input_section_for_script(Relobj* object,
2412 if (addralign > this->addralign_)
2413 this->addralign_ = addralign;
2415 off_t offset_in_section = this->current_data_size_for_child();
2416 off_t aligned_offset_in_section = align_address(offset_in_section,
2419 this->set_current_data_size_for_child(aligned_offset_in_section
2422 this->input_sections_.push_back(Input_section(object, shndx,
2423 data_size, addralign));
2426 // Print stats for merge sections to stderr.
2429 Output_section::print_merge_stats()
2431 Input_section_list::iterator p;
2432 for (p = this->input_sections_.begin();
2433 p != this->input_sections_.end();
2435 p->print_merge_stats(this->name_);
2438 // Output segment methods.
2440 Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
2452 is_max_align_known_(false),
2453 are_addresses_set_(false)
2457 // Add an Output_section to an Output_segment.
2460 Output_segment::add_output_section(Output_section* os,
2461 elfcpp::Elf_Word seg_flags,
2464 gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
2465 gold_assert(!this->is_max_align_known_);
2467 // Update the segment flags.
2468 this->flags_ |= seg_flags;
2470 Output_segment::Output_data_list* pdl;
2471 if (os->type() == elfcpp::SHT_NOBITS)
2472 pdl = &this->output_bss_;
2474 pdl = &this->output_data_;
2476 // So that PT_NOTE segments will work correctly, we need to ensure
2477 // that all SHT_NOTE sections are adjacent. This will normally
2478 // happen automatically, because all the SHT_NOTE input sections
2479 // will wind up in the same output section. However, it is possible
2480 // for multiple SHT_NOTE input sections to have different section
2481 // flags, and thus be in different output sections, but for the
2482 // different section flags to map into the same segment flags and
2483 // thus the same output segment.
2485 // Note that while there may be many input sections in an output
2486 // section, there are normally only a few output sections in an
2487 // output segment. This loop is expected to be fast.
2489 if (os->type() == elfcpp::SHT_NOTE && !pdl->empty())
2491 Output_segment::Output_data_list::iterator p = pdl->end();
2495 if ((*p)->is_section_type(elfcpp::SHT_NOTE))
2497 // We don't worry about the FRONT parameter.
2503 while (p != pdl->begin());
2506 // Similarly, so that PT_TLS segments will work, we need to group
2507 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
2508 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
2509 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
2510 // correctly. SHF_TLS sections get added to both a PT_LOAD segment
2511 // and the PT_TLS segment -- we do this grouping only for the
2513 if (this->type_ != elfcpp::PT_TLS
2514 && (os->flags() & elfcpp::SHF_TLS) != 0
2515 && !this->output_data_.empty())
2517 pdl = &this->output_data_;
2518 bool nobits = os->type() == elfcpp::SHT_NOBITS;
2519 bool sawtls = false;
2520 Output_segment::Output_data_list::iterator p = pdl->end();
2525 if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
2528 // Put a NOBITS section after the first TLS section.
2529 // But a PROGBITS section after the first TLS/PROGBITS
2531 insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
2535 // If we've gone past the TLS sections, but we've seen a
2536 // TLS section, then we need to insert this section now.
2542 // We don't worry about the FRONT parameter.
2548 while (p != pdl->begin());
2550 // There are no TLS sections yet; put this one at the requested
2551 // location in the section list.
2555 pdl->push_front(os);
2560 // Remove an Output_section from this segment. It is an error if it
2564 Output_segment::remove_output_section(Output_section* os)
2566 // We only need this for SHT_PROGBITS.
2567 gold_assert(os->type() == elfcpp::SHT_PROGBITS);
2568 for (Output_data_list::iterator p = this->output_data_.begin();
2569 p != this->output_data_.end();
2574 this->output_data_.erase(p);
2581 // Add an Output_data (which is not an Output_section) to the start of
2585 Output_segment::add_initial_output_data(Output_data* od)
2587 gold_assert(!this->is_max_align_known_);
2588 this->output_data_.push_front(od);
2591 // Return the maximum alignment of the Output_data in Output_segment.
2594 Output_segment::maximum_alignment()
2596 if (!this->is_max_align_known_)
2600 addralign = Output_segment::maximum_alignment_list(&this->output_data_);
2601 if (addralign > this->max_align_)
2602 this->max_align_ = addralign;
2604 addralign = Output_segment::maximum_alignment_list(&this->output_bss_);
2605 if (addralign > this->max_align_)
2606 this->max_align_ = addralign;
2608 this->is_max_align_known_ = true;
2611 return this->max_align_;
2614 // Return the maximum alignment of a list of Output_data.
2617 Output_segment::maximum_alignment_list(const Output_data_list* pdl)
2620 for (Output_data_list::const_iterator p = pdl->begin();
2624 uint64_t addralign = (*p)->addralign();
2625 if (addralign > ret)
2631 // Return the number of dynamic relocs applied to this segment.
2634 Output_segment::dynamic_reloc_count() const
2636 return (this->dynamic_reloc_count_list(&this->output_data_)
2637 + this->dynamic_reloc_count_list(&this->output_bss_));
2640 // Return the number of dynamic relocs applied to an Output_data_list.
2643 Output_segment::dynamic_reloc_count_list(const Output_data_list* pdl) const
2645 unsigned int count = 0;
2646 for (Output_data_list::const_iterator p = pdl->begin();
2649 count += (*p)->dynamic_reloc_count();
2653 // Set the section addresses for an Output_segment. If RESET is true,
2654 // reset the addresses first. ADDR is the address and *POFF is the
2655 // file offset. Set the section indexes starting with *PSHNDX.
2656 // Return the address of the immediately following segment. Update
2657 // *POFF and *PSHNDX.
2660 Output_segment::set_section_addresses(const Layout* layout, bool reset,
2661 uint64_t addr, off_t* poff,
2662 unsigned int* pshndx)
2664 gold_assert(this->type_ == elfcpp::PT_LOAD);
2666 if (!reset && this->are_addresses_set_)
2668 gold_assert(this->paddr_ == addr);
2669 addr = this->vaddr_;
2673 this->vaddr_ = addr;
2674 this->paddr_ = addr;
2675 this->are_addresses_set_ = true;
2678 bool in_tls = false;
2680 off_t orig_off = *poff;
2681 this->offset_ = orig_off;
2683 addr = this->set_section_list_addresses(layout, reset, &this->output_data_,
2684 addr, poff, pshndx, &in_tls);
2685 this->filesz_ = *poff - orig_off;
2689 uint64_t ret = this->set_section_list_addresses(layout, reset,
2694 // If the last section was a TLS section, align upward to the
2695 // alignment of the TLS segment, so that the overall size of the TLS
2696 // segment is aligned.
2699 uint64_t segment_align = layout->tls_segment()->maximum_alignment();
2700 *poff = align_address(*poff, segment_align);
2703 this->memsz_ = *poff - orig_off;
2705 // Ignore the file offset adjustments made by the BSS Output_data
2712 // Set the addresses and file offsets in a list of Output_data
2716 Output_segment::set_section_list_addresses(const Layout* layout, bool reset,
2717 Output_data_list* pdl,
2718 uint64_t addr, off_t* poff,
2719 unsigned int* pshndx,
2722 off_t startoff = *poff;
2724 off_t off = startoff;
2725 for (Output_data_list::iterator p = pdl->begin();
2730 (*p)->reset_address_and_file_offset();
2732 // When using a linker script the section will most likely
2733 // already have an address.
2734 if (!(*p)->is_address_valid())
2736 uint64_t align = (*p)->addralign();
2738 if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
2740 // Give the first TLS section the alignment of the
2741 // entire TLS segment. Otherwise the TLS segment as a
2742 // whole may be misaligned.
2745 Output_segment* tls_segment = layout->tls_segment();
2746 gold_assert(tls_segment != NULL);
2747 uint64_t segment_align = tls_segment->maximum_alignment();
2748 gold_assert(segment_align >= align);
2749 align = segment_align;
2756 // If this is the first section after the TLS segment,
2757 // align it to at least the alignment of the TLS
2758 // segment, so that the size of the overall TLS segment
2762 uint64_t segment_align =
2763 layout->tls_segment()->maximum_alignment();
2764 if (segment_align > align)
2765 align = segment_align;
2771 off = align_address(off, align);
2772 (*p)->set_address_and_file_offset(addr + (off - startoff), off);
2776 // The script may have inserted a skip forward, but it
2777 // better not have moved backward.
2778 gold_assert((*p)->address() >= addr + (off - startoff));
2779 off += (*p)->address() - (addr + (off - startoff));
2780 (*p)->set_file_offset(off);
2781 (*p)->finalize_data_size();
2784 // We want to ignore the size of a SHF_TLS or SHT_NOBITS
2785 // section. Such a section does not affect the size of a
2787 if (!(*p)->is_section_flag_set(elfcpp::SHF_TLS)
2788 || !(*p)->is_section_type(elfcpp::SHT_NOBITS))
2789 off += (*p)->data_size();
2791 if ((*p)->is_section())
2793 (*p)->set_out_shndx(*pshndx);
2799 return addr + (off - startoff);
2802 // For a non-PT_LOAD segment, set the offset from the sections, if
2806 Output_segment::set_offset()
2808 gold_assert(this->type_ != elfcpp::PT_LOAD);
2810 gold_assert(!this->are_addresses_set_);
2812 if (this->output_data_.empty() && this->output_bss_.empty())
2816 this->are_addresses_set_ = true;
2818 this->min_p_align_ = 0;
2824 const Output_data* first;
2825 if (this->output_data_.empty())
2826 first = this->output_bss_.front();
2828 first = this->output_data_.front();
2829 this->vaddr_ = first->address();
2830 this->paddr_ = (first->has_load_address()
2831 ? first->load_address()
2833 this->are_addresses_set_ = true;
2834 this->offset_ = first->offset();
2836 if (this->output_data_.empty())
2840 const Output_data* last_data = this->output_data_.back();
2841 this->filesz_ = (last_data->address()
2842 + last_data->data_size()
2846 const Output_data* last;
2847 if (this->output_bss_.empty())
2848 last = this->output_data_.back();
2850 last = this->output_bss_.back();
2851 this->memsz_ = (last->address()
2855 // If this is a TLS segment, align the memory size. The code in
2856 // set_section_list ensures that the section after the TLS segment
2857 // is aligned to give us room.
2858 if (this->type_ == elfcpp::PT_TLS)
2860 uint64_t segment_align = this->maximum_alignment();
2861 gold_assert(this->vaddr_ == align_address(this->vaddr_, segment_align));
2862 this->memsz_ = align_address(this->memsz_, segment_align);
2866 // Set the TLS offsets of the sections in the PT_TLS segment.
2869 Output_segment::set_tls_offsets()
2871 gold_assert(this->type_ == elfcpp::PT_TLS);
2873 for (Output_data_list::iterator p = this->output_data_.begin();
2874 p != this->output_data_.end();
2876 (*p)->set_tls_offset(this->vaddr_);
2878 for (Output_data_list::iterator p = this->output_bss_.begin();
2879 p != this->output_bss_.end();
2881 (*p)->set_tls_offset(this->vaddr_);
2884 // Return the address of the first section.
2887 Output_segment::first_section_load_address() const
2889 for (Output_data_list::const_iterator p = this->output_data_.begin();
2890 p != this->output_data_.end();
2892 if ((*p)->is_section())
2893 return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address();
2895 for (Output_data_list::const_iterator p = this->output_bss_.begin();
2896 p != this->output_bss_.end();
2898 if ((*p)->is_section())
2899 return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address();
2904 // Return the number of Output_sections in an Output_segment.
2907 Output_segment::output_section_count() const
2909 return (this->output_section_count_list(&this->output_data_)
2910 + this->output_section_count_list(&this->output_bss_));
2913 // Return the number of Output_sections in an Output_data_list.
2916 Output_segment::output_section_count_list(const Output_data_list* pdl) const
2918 unsigned int count = 0;
2919 for (Output_data_list::const_iterator p = pdl->begin();
2923 if ((*p)->is_section())
2929 // Return the section attached to the list segment with the lowest
2930 // load address. This is used when handling a PHDRS clause in a
2934 Output_segment::section_with_lowest_load_address() const
2936 Output_section* found = NULL;
2937 uint64_t found_lma = 0;
2938 this->lowest_load_address_in_list(&this->output_data_, &found, &found_lma);
2940 Output_section* found_data = found;
2941 this->lowest_load_address_in_list(&this->output_bss_, &found, &found_lma);
2942 if (found != found_data && found_data != NULL)
2944 gold_error(_("nobits section %s may not precede progbits section %s "
2946 found->name(), found_data->name());
2953 // Look through a list for a section with a lower load address.
2956 Output_segment::lowest_load_address_in_list(const Output_data_list* pdl,
2957 Output_section** found,
2958 uint64_t* found_lma) const
2960 for (Output_data_list::const_iterator p = pdl->begin();
2964 if (!(*p)->is_section())
2966 Output_section* os = static_cast<Output_section*>(*p);
2967 uint64_t lma = (os->has_load_address()
2968 ? os->load_address()
2970 if (*found == NULL || lma < *found_lma)
2978 // Write the segment data into *OPHDR.
2980 template<int size, bool big_endian>
2982 Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr)
2984 ophdr->put_p_type(this->type_);
2985 ophdr->put_p_offset(this->offset_);
2986 ophdr->put_p_vaddr(this->vaddr_);
2987 ophdr->put_p_paddr(this->paddr_);
2988 ophdr->put_p_filesz(this->filesz_);
2989 ophdr->put_p_memsz(this->memsz_);
2990 ophdr->put_p_flags(this->flags_);
2991 ophdr->put_p_align(std::max(this->min_p_align_, this->maximum_alignment()));
2994 // Write the section headers into V.
2996 template<int size, bool big_endian>
2998 Output_segment::write_section_headers(const Layout* layout,
2999 const Stringpool* secnamepool,
3001 unsigned int *pshndx) const
3003 // Every section that is attached to a segment must be attached to a
3004 // PT_LOAD segment, so we only write out section headers for PT_LOAD
3006 if (this->type_ != elfcpp::PT_LOAD)
3009 v = this->write_section_headers_list<size, big_endian>(layout, secnamepool,
3010 &this->output_data_,
3012 v = this->write_section_headers_list<size, big_endian>(layout, secnamepool,
3018 template<int size, bool big_endian>
3020 Output_segment::write_section_headers_list(const Layout* layout,
3021 const Stringpool* secnamepool,
3022 const Output_data_list* pdl,
3024 unsigned int* pshndx) const
3026 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
3027 for (Output_data_list::const_iterator p = pdl->begin();
3031 if ((*p)->is_section())
3033 const Output_section* ps = static_cast<const Output_section*>(*p);
3034 gold_assert(*pshndx == ps->out_shndx());
3035 elfcpp::Shdr_write<size, big_endian> oshdr(v);
3036 ps->write_header(layout, secnamepool, &oshdr);
3044 // Output_file methods.
3046 Output_file::Output_file(const char* name)
3051 map_is_anonymous_(false),
3052 is_temporary_(false)
3056 // Open the output file.
3059 Output_file::open(off_t file_size)
3061 this->file_size_ = file_size;
3063 // Unlink the file first; otherwise the open() may fail if the file
3064 // is busy (e.g. it's an executable that's currently being executed).
3066 // However, the linker may be part of a system where a zero-length
3067 // file is created for it to write to, with tight permissions (gcc
3068 // 2.95 did something like this). Unlinking the file would work
3069 // around those permission controls, so we only unlink if the file
3070 // has a non-zero size. We also unlink only regular files to avoid
3071 // trouble with directories/etc.
3073 // If we fail, continue; this command is merely a best-effort attempt
3074 // to improve the odds for open().
3076 // We let the name "-" mean "stdout"
3077 if (!this->is_temporary_)
3079 if (strcmp(this->name_, "-") == 0)
3080 this->o_ = STDOUT_FILENO;
3084 if (::stat(this->name_, &s) == 0 && s.st_size != 0)
3085 unlink_if_ordinary(this->name_);
3087 int mode = parameters->options().relocatable() ? 0666 : 0777;
3088 int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
3090 gold_fatal(_("%s: open: %s"), this->name_, strerror(errno));
3098 // Resize the output file.
3101 Output_file::resize(off_t file_size)
3103 // If the mmap is mapping an anonymous memory buffer, this is easy:
3104 // just mremap to the new size. If it's mapping to a file, we want
3105 // to unmap to flush to the file, then remap after growing the file.
3106 if (this->map_is_anonymous_)
3108 void* base = ::mremap(this->base_, this->file_size_, file_size,
3110 if (base == MAP_FAILED)
3111 gold_fatal(_("%s: mremap: %s"), this->name_, strerror(errno));
3112 this->base_ = static_cast<unsigned char*>(base);
3113 this->file_size_ = file_size;
3118 this->file_size_ = file_size;
3123 // Map the file into memory.
3128 const int o = this->o_;
3130 // If the output file is not a regular file, don't try to mmap it;
3131 // instead, we'll mmap a block of memory (an anonymous buffer), and
3132 // then later write the buffer to the file.
3134 struct stat statbuf;
3135 if (o == STDOUT_FILENO || o == STDERR_FILENO
3136 || ::fstat(o, &statbuf) != 0
3137 || !S_ISREG(statbuf.st_mode)
3138 || this->is_temporary_)
3140 this->map_is_anonymous_ = true;
3141 base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
3142 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
3146 // Write out one byte to make the file the right size.
3147 if (::lseek(o, this->file_size_ - 1, SEEK_SET) < 0)
3148 gold_fatal(_("%s: lseek: %s"), this->name_, strerror(errno));
3150 if (::write(o, &b, 1) != 1)
3151 gold_fatal(_("%s: write: %s"), this->name_, strerror(errno));
3153 // Map the file into memory.
3154 this->map_is_anonymous_ = false;
3155 base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
3158 if (base == MAP_FAILED)
3159 gold_fatal(_("%s: mmap: %s"), this->name_, strerror(errno));
3160 this->base_ = static_cast<unsigned char*>(base);
3163 // Unmap the file from memory.
3166 Output_file::unmap()
3168 if (::munmap(this->base_, this->file_size_) < 0)
3169 gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
3173 // Close the output file.
3176 Output_file::close()
3178 // If the map isn't file-backed, we need to write it now.
3179 if (this->map_is_anonymous_ && !this->is_temporary_)
3181 size_t bytes_to_write = this->file_size_;
3182 while (bytes_to_write > 0)
3184 ssize_t bytes_written = ::write(this->o_, this->base_, bytes_to_write);
3185 if (bytes_written == 0)
3186 gold_error(_("%s: write: unexpected 0 return-value"), this->name_);
3187 else if (bytes_written < 0)
3188 gold_error(_("%s: write: %s"), this->name_, strerror(errno));
3190 bytes_to_write -= bytes_written;
3195 // We don't close stdout or stderr
3196 if (this->o_ != STDOUT_FILENO
3197 && this->o_ != STDERR_FILENO
3198 && !this->is_temporary_)
3199 if (::close(this->o_) < 0)
3200 gold_error(_("%s: close: %s"), this->name_, strerror(errno));
3204 // Instantiate the templates we need. We could use the configure
3205 // script to restrict this to only the ones for implemented targets.
3207 #ifdef HAVE_TARGET_32_LITTLE
3210 Output_section::add_input_section<32, false>(
3211 Sized_relobj<32, false>* object,
3213 const char* secname,
3214 const elfcpp::Shdr<32, false>& shdr,
3215 unsigned int reloc_shndx,
3216 bool have_sections_script);
3219 #ifdef HAVE_TARGET_32_BIG
3222 Output_section::add_input_section<32, true>(
3223 Sized_relobj<32, true>* object,
3225 const char* secname,
3226 const elfcpp::Shdr<32, true>& shdr,
3227 unsigned int reloc_shndx,
3228 bool have_sections_script);
3231 #ifdef HAVE_TARGET_64_LITTLE
3234 Output_section::add_input_section<64, false>(
3235 Sized_relobj<64, false>* object,
3237 const char* secname,
3238 const elfcpp::Shdr<64, false>& shdr,
3239 unsigned int reloc_shndx,
3240 bool have_sections_script);
3243 #ifdef HAVE_TARGET_64_BIG
3246 Output_section::add_input_section<64, true>(
3247 Sized_relobj<64, true>* object,
3249 const char* secname,
3250 const elfcpp::Shdr<64, true>& shdr,
3251 unsigned int reloc_shndx,
3252 bool have_sections_script);
3255 #ifdef HAVE_TARGET_32_LITTLE
3257 class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
3260 #ifdef HAVE_TARGET_32_BIG
3262 class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
3265 #ifdef HAVE_TARGET_64_LITTLE
3267 class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
3270 #ifdef HAVE_TARGET_64_BIG
3272 class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
3275 #ifdef HAVE_TARGET_32_LITTLE
3277 class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
3280 #ifdef HAVE_TARGET_32_BIG
3282 class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
3285 #ifdef HAVE_TARGET_64_LITTLE
3287 class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
3290 #ifdef HAVE_TARGET_64_BIG
3292 class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
3295 #ifdef HAVE_TARGET_32_LITTLE
3297 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
3300 #ifdef HAVE_TARGET_32_BIG
3302 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
3305 #ifdef HAVE_TARGET_64_LITTLE
3307 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
3310 #ifdef HAVE_TARGET_64_BIG
3312 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
3315 #ifdef HAVE_TARGET_32_LITTLE
3317 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
3320 #ifdef HAVE_TARGET_32_BIG
3322 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
3325 #ifdef HAVE_TARGET_64_LITTLE
3327 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
3330 #ifdef HAVE_TARGET_64_BIG
3332 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
3335 #ifdef HAVE_TARGET_32_LITTLE
3337 class Output_relocatable_relocs<elfcpp::SHT_REL, 32, false>;
3340 #ifdef HAVE_TARGET_32_BIG
3342 class Output_relocatable_relocs<elfcpp::SHT_REL, 32, true>;
3345 #ifdef HAVE_TARGET_64_LITTLE
3347 class Output_relocatable_relocs<elfcpp::SHT_REL, 64, false>;
3350 #ifdef HAVE_TARGET_64_BIG
3352 class Output_relocatable_relocs<elfcpp::SHT_REL, 64, true>;
3355 #ifdef HAVE_TARGET_32_LITTLE
3357 class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, false>;
3360 #ifdef HAVE_TARGET_32_BIG
3362 class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, true>;
3365 #ifdef HAVE_TARGET_64_LITTLE
3367 class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, false>;
3370 #ifdef HAVE_TARGET_64_BIG
3372 class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, true>;
3375 #ifdef HAVE_TARGET_32_LITTLE
3377 class Output_data_group<32, false>;
3380 #ifdef HAVE_TARGET_32_BIG
3382 class Output_data_group<32, true>;
3385 #ifdef HAVE_TARGET_64_LITTLE
3387 class Output_data_group<64, false>;
3390 #ifdef HAVE_TARGET_64_BIG
3392 class Output_data_group<64, true>;
3395 #ifdef HAVE_TARGET_32_LITTLE
3397 class Output_data_got<32, false>;
3400 #ifdef HAVE_TARGET_32_BIG
3402 class Output_data_got<32, true>;
3405 #ifdef HAVE_TARGET_64_LITTLE
3407 class Output_data_got<64, false>;
3410 #ifdef HAVE_TARGET_64_BIG
3412 class Output_data_got<64, true>;
3415 } // End namespace gold.