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.
32 #include "libiberty.h" // for unlink_if_ordinary()
34 #include "parameters.h"
41 // Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS
43 # define MAP_ANONYMOUS MAP_ANON
49 // Output_data variables.
51 bool Output_data::allocated_sizes_are_fixed;
53 // Output_data methods.
55 Output_data::~Output_data()
59 // Return the default alignment for the target size.
62 Output_data::default_alignment()
64 return Output_data::default_alignment_for_size(
65 parameters->target().get_size());
68 // Return the default alignment for a size--32 or 64.
71 Output_data::default_alignment_for_size(int size)
81 // Output_section_header methods. This currently assumes that the
82 // segment and section lists are complete at construction time.
84 Output_section_headers::Output_section_headers(
86 const Layout::Segment_list* segment_list,
87 const Layout::Section_list* section_list,
88 const Layout::Section_list* unattached_section_list,
89 const Stringpool* secnamepool)
91 segment_list_(segment_list),
92 section_list_(section_list),
93 unattached_section_list_(unattached_section_list),
94 secnamepool_(secnamepool)
96 // Count all the sections. Start with 1 for the null section.
98 if (!parameters->options().relocatable())
100 for (Layout::Segment_list::const_iterator p = segment_list->begin();
101 p != segment_list->end();
103 if ((*p)->type() == elfcpp::PT_LOAD)
104 count += (*p)->output_section_count();
108 for (Layout::Section_list::const_iterator p = section_list->begin();
109 p != section_list->end();
111 if (((*p)->flags() & elfcpp::SHF_ALLOC) != 0)
114 count += unattached_section_list->size();
116 const int size = parameters->target().get_size();
119 shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
121 shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
125 this->set_data_size(count * shdr_size);
128 // Write out the section headers.
131 Output_section_headers::do_write(Output_file* of)
133 switch (parameters->size_and_endianness())
135 #ifdef HAVE_TARGET_32_LITTLE
136 case Parameters::TARGET_32_LITTLE:
137 this->do_sized_write<32, false>(of);
140 #ifdef HAVE_TARGET_32_BIG
141 case Parameters::TARGET_32_BIG:
142 this->do_sized_write<32, true>(of);
145 #ifdef HAVE_TARGET_64_LITTLE
146 case Parameters::TARGET_64_LITTLE:
147 this->do_sized_write<64, false>(of);
150 #ifdef HAVE_TARGET_64_BIG
151 case Parameters::TARGET_64_BIG:
152 this->do_sized_write<64, true>(of);
160 template<int size, bool big_endian>
162 Output_section_headers::do_sized_write(Output_file* of)
164 off_t all_shdrs_size = this->data_size();
165 unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
167 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
168 unsigned char* v = view;
171 typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
172 oshdr.put_sh_name(0);
173 oshdr.put_sh_type(elfcpp::SHT_NULL);
174 oshdr.put_sh_flags(0);
175 oshdr.put_sh_addr(0);
176 oshdr.put_sh_offset(0);
177 oshdr.put_sh_size(0);
178 oshdr.put_sh_link(0);
179 oshdr.put_sh_info(0);
180 oshdr.put_sh_addralign(0);
181 oshdr.put_sh_entsize(0);
186 unsigned int shndx = 1;
187 if (!parameters->options().relocatable())
189 for (Layout::Segment_list::const_iterator p =
190 this->segment_list_->begin();
191 p != this->segment_list_->end();
193 v = (*p)->write_section_headers<size, big_endian>(this->layout_,
200 for (Layout::Section_list::const_iterator p =
201 this->section_list_->begin();
202 p != this->section_list_->end();
205 // We do unallocated sections below, except that group
206 // sections have to come first.
207 if (((*p)->flags() & elfcpp::SHF_ALLOC) == 0
208 && (*p)->type() != elfcpp::SHT_GROUP)
210 gold_assert(shndx == (*p)->out_shndx());
211 elfcpp::Shdr_write<size, big_endian> oshdr(v);
212 (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
218 for (Layout::Section_list::const_iterator p =
219 this->unattached_section_list_->begin();
220 p != this->unattached_section_list_->end();
223 // For a relocatable link, we did unallocated group sections
224 // above, since they have to come first.
225 if ((*p)->type() == elfcpp::SHT_GROUP
226 && parameters->options().relocatable())
228 gold_assert(shndx == (*p)->out_shndx());
229 elfcpp::Shdr_write<size, big_endian> oshdr(v);
230 (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
235 of->write_output_view(this->offset(), all_shdrs_size, view);
238 // Output_segment_header methods.
240 Output_segment_headers::Output_segment_headers(
241 const Layout::Segment_list& segment_list)
242 : segment_list_(segment_list)
244 const int size = parameters->target().get_size();
247 phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
249 phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
253 this->set_data_size(segment_list.size() * phdr_size);
257 Output_segment_headers::do_write(Output_file* of)
259 switch (parameters->size_and_endianness())
261 #ifdef HAVE_TARGET_32_LITTLE
262 case Parameters::TARGET_32_LITTLE:
263 this->do_sized_write<32, false>(of);
266 #ifdef HAVE_TARGET_32_BIG
267 case Parameters::TARGET_32_BIG:
268 this->do_sized_write<32, true>(of);
271 #ifdef HAVE_TARGET_64_LITTLE
272 case Parameters::TARGET_64_LITTLE:
273 this->do_sized_write<64, false>(of);
276 #ifdef HAVE_TARGET_64_BIG
277 case Parameters::TARGET_64_BIG:
278 this->do_sized_write<64, true>(of);
286 template<int size, bool big_endian>
288 Output_segment_headers::do_sized_write(Output_file* of)
290 const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
291 off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
292 gold_assert(all_phdrs_size == this->data_size());
293 unsigned char* view = of->get_output_view(this->offset(),
295 unsigned char* v = view;
296 for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
297 p != this->segment_list_.end();
300 elfcpp::Phdr_write<size, big_endian> ophdr(v);
301 (*p)->write_header(&ophdr);
305 gold_assert(v - view == all_phdrs_size);
307 of->write_output_view(this->offset(), all_phdrs_size, view);
310 // Output_file_header methods.
312 Output_file_header::Output_file_header(const Target* target,
313 const Symbol_table* symtab,
314 const Output_segment_headers* osh,
318 segment_header_(osh),
319 section_header_(NULL),
323 const int size = parameters->target().get_size();
326 ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
328 ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
332 this->set_data_size(ehdr_size);
335 // Set the section table information for a file header.
338 Output_file_header::set_section_info(const Output_section_headers* shdrs,
339 const Output_section* shstrtab)
341 this->section_header_ = shdrs;
342 this->shstrtab_ = shstrtab;
345 // Write out the file header.
348 Output_file_header::do_write(Output_file* of)
350 gold_assert(this->offset() == 0);
352 switch (parameters->size_and_endianness())
354 #ifdef HAVE_TARGET_32_LITTLE
355 case Parameters::TARGET_32_LITTLE:
356 this->do_sized_write<32, false>(of);
359 #ifdef HAVE_TARGET_32_BIG
360 case Parameters::TARGET_32_BIG:
361 this->do_sized_write<32, true>(of);
364 #ifdef HAVE_TARGET_64_LITTLE
365 case Parameters::TARGET_64_LITTLE:
366 this->do_sized_write<64, false>(of);
369 #ifdef HAVE_TARGET_64_BIG
370 case Parameters::TARGET_64_BIG:
371 this->do_sized_write<64, true>(of);
379 // Write out the file header with appropriate size and endianess.
381 template<int size, bool big_endian>
383 Output_file_header::do_sized_write(Output_file* of)
385 gold_assert(this->offset() == 0);
387 int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
388 unsigned char* view = of->get_output_view(0, ehdr_size);
389 elfcpp::Ehdr_write<size, big_endian> oehdr(view);
391 unsigned char e_ident[elfcpp::EI_NIDENT];
392 memset(e_ident, 0, elfcpp::EI_NIDENT);
393 e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
394 e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
395 e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
396 e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
398 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
400 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
403 e_ident[elfcpp::EI_DATA] = (big_endian
404 ? elfcpp::ELFDATA2MSB
405 : elfcpp::ELFDATA2LSB);
406 e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
407 // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
408 oehdr.put_e_ident(e_ident);
411 if (parameters->options().relocatable())
412 e_type = elfcpp::ET_REL;
413 else if (parameters->options().shared())
414 e_type = elfcpp::ET_DYN;
416 e_type = elfcpp::ET_EXEC;
417 oehdr.put_e_type(e_type);
419 oehdr.put_e_machine(this->target_->machine_code());
420 oehdr.put_e_version(elfcpp::EV_CURRENT);
422 oehdr.put_e_entry(this->entry<size>());
424 if (this->segment_header_ == NULL)
425 oehdr.put_e_phoff(0);
427 oehdr.put_e_phoff(this->segment_header_->offset());
429 oehdr.put_e_shoff(this->section_header_->offset());
431 // FIXME: The target needs to set the flags.
432 oehdr.put_e_flags(0);
434 oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
436 if (this->segment_header_ == NULL)
438 oehdr.put_e_phentsize(0);
439 oehdr.put_e_phnum(0);
443 oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
444 oehdr.put_e_phnum(this->segment_header_->data_size()
445 / elfcpp::Elf_sizes<size>::phdr_size);
448 oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
449 oehdr.put_e_shnum(this->section_header_->data_size()
450 / elfcpp::Elf_sizes<size>::shdr_size);
451 oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
453 of->write_output_view(0, ehdr_size, view);
456 // Return the value to use for the entry address. THIS->ENTRY_ is the
457 // symbol specified on the command line, if any.
460 typename elfcpp::Elf_types<size>::Elf_Addr
461 Output_file_header::entry()
463 const bool should_issue_warning = (this->entry_ != NULL
464 && !parameters->options().relocatable()
465 && !parameters->options().shared());
467 // FIXME: Need to support target specific entry symbol.
468 const char* entry = this->entry_;
472 Symbol* sym = this->symtab_->lookup(entry);
474 typename Sized_symbol<size>::Value_type v;
477 Sized_symbol<size>* ssym;
478 ssym = this->symtab_->get_sized_symbol<size>(sym);
479 if (!ssym->is_defined() && should_issue_warning)
480 gold_warning("entry symbol '%s' exists but is not defined", entry);
485 // We couldn't find the entry symbol. See if we can parse it as
486 // a number. This supports, e.g., -e 0x1000.
488 v = strtoull(entry, &endptr, 0);
491 if (should_issue_warning)
492 gold_warning("cannot find entry symbol '%s'", entry);
500 // Output_data_const methods.
503 Output_data_const::do_write(Output_file* of)
505 of->write(this->offset(), this->data_.data(), this->data_.size());
508 // Output_data_const_buffer methods.
511 Output_data_const_buffer::do_write(Output_file* of)
513 of->write(this->offset(), this->p_, this->data_size());
516 // Output_section_data methods.
518 // Record the output section, and set the entry size and such.
521 Output_section_data::set_output_section(Output_section* os)
523 gold_assert(this->output_section_ == NULL);
524 this->output_section_ = os;
525 this->do_adjust_output_section(os);
528 // Return the section index of the output section.
531 Output_section_data::do_out_shndx() const
533 gold_assert(this->output_section_ != NULL);
534 return this->output_section_->out_shndx();
537 // Output_data_strtab methods.
539 // Set the final data size.
542 Output_data_strtab::set_final_data_size()
544 this->strtab_->set_string_offsets();
545 this->set_data_size(this->strtab_->get_strtab_size());
548 // Write out a string table.
551 Output_data_strtab::do_write(Output_file* of)
553 this->strtab_->write(of, this->offset());
556 // Output_reloc methods.
558 // A reloc against a global symbol.
560 template<bool dynamic, int size, bool big_endian>
561 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
567 : address_(address), local_sym_index_(GSYM_CODE), type_(type),
568 is_relative_(is_relative), is_section_symbol_(false), shndx_(INVALID_CODE)
570 // this->type_ is a bitfield; make sure TYPE fits.
571 gold_assert(this->type_ == type);
572 this->u1_.gsym = gsym;
575 this->set_needs_dynsym_index();
578 template<bool dynamic, int size, bool big_endian>
579 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
586 : address_(address), local_sym_index_(GSYM_CODE), type_(type),
587 is_relative_(is_relative), is_section_symbol_(false), shndx_(shndx)
589 gold_assert(shndx != INVALID_CODE);
590 // this->type_ is a bitfield; make sure TYPE fits.
591 gold_assert(this->type_ == type);
592 this->u1_.gsym = gsym;
593 this->u2_.relobj = relobj;
595 this->set_needs_dynsym_index();
598 // A reloc against a local symbol.
600 template<bool dynamic, int size, bool big_endian>
601 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
602 Sized_relobj<size, big_endian>* relobj,
603 unsigned int local_sym_index,
608 bool is_section_symbol)
609 : address_(address), local_sym_index_(local_sym_index), type_(type),
610 is_relative_(is_relative), is_section_symbol_(is_section_symbol),
613 gold_assert(local_sym_index != GSYM_CODE
614 && local_sym_index != INVALID_CODE);
615 // this->type_ is a bitfield; make sure TYPE fits.
616 gold_assert(this->type_ == type);
617 this->u1_.relobj = relobj;
620 this->set_needs_dynsym_index();
623 template<bool dynamic, int size, bool big_endian>
624 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
625 Sized_relobj<size, big_endian>* relobj,
626 unsigned int local_sym_index,
631 bool is_section_symbol)
632 : address_(address), local_sym_index_(local_sym_index), type_(type),
633 is_relative_(is_relative), is_section_symbol_(is_section_symbol),
636 gold_assert(local_sym_index != GSYM_CODE
637 && local_sym_index != INVALID_CODE);
638 gold_assert(shndx != INVALID_CODE);
639 // this->type_ is a bitfield; make sure TYPE fits.
640 gold_assert(this->type_ == type);
641 this->u1_.relobj = relobj;
642 this->u2_.relobj = relobj;
644 this->set_needs_dynsym_index();
647 // A reloc against the STT_SECTION symbol of an output section.
649 template<bool dynamic, int size, bool big_endian>
650 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
655 : address_(address), local_sym_index_(SECTION_CODE), type_(type),
656 is_relative_(false), is_section_symbol_(true), shndx_(INVALID_CODE)
658 // this->type_ is a bitfield; make sure TYPE fits.
659 gold_assert(this->type_ == type);
663 this->set_needs_dynsym_index();
665 os->set_needs_symtab_index();
668 template<bool dynamic, int size, bool big_endian>
669 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::Output_reloc(
675 : address_(address), local_sym_index_(SECTION_CODE), type_(type),
676 is_relative_(false), is_section_symbol_(true), shndx_(shndx)
678 gold_assert(shndx != INVALID_CODE);
679 // this->type_ is a bitfield; make sure TYPE fits.
680 gold_assert(this->type_ == type);
682 this->u2_.relobj = relobj;
684 this->set_needs_dynsym_index();
686 os->set_needs_symtab_index();
689 // Record that we need a dynamic symbol index for this relocation.
691 template<bool dynamic, int size, bool big_endian>
693 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
694 set_needs_dynsym_index()
696 if (this->is_relative_)
698 switch (this->local_sym_index_)
704 this->u1_.gsym->set_needs_dynsym_entry();
708 this->u1_.os->set_needs_dynsym_index();
716 const unsigned int lsi = this->local_sym_index_;
717 if (!this->is_section_symbol_)
718 this->u1_.relobj->set_needs_output_dynsym_entry(lsi);
721 section_offset_type dummy;
722 Output_section* os = this->u1_.relobj->output_section(lsi, &dummy);
723 gold_assert(os != NULL);
724 os->set_needs_dynsym_index();
731 // Get the symbol index of a relocation.
733 template<bool dynamic, int size, bool big_endian>
735 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index()
739 switch (this->local_sym_index_)
745 if (this->u1_.gsym == NULL)
748 index = this->u1_.gsym->dynsym_index();
750 index = this->u1_.gsym->symtab_index();
755 index = this->u1_.os->dynsym_index();
757 index = this->u1_.os->symtab_index();
761 // Relocations without symbols use a symbol index of 0.
767 const unsigned int lsi = this->local_sym_index_;
768 if (!this->is_section_symbol_)
771 index = this->u1_.relobj->dynsym_index(lsi);
773 index = this->u1_.relobj->symtab_index(lsi);
777 section_offset_type dummy;
778 Output_section* os = this->u1_.relobj->output_section(lsi, &dummy);
779 gold_assert(os != NULL);
781 index = os->dynsym_index();
783 index = os->symtab_index();
788 gold_assert(index != -1U);
792 // For a local section symbol, get the section offset of the input
793 // section within the output section.
795 template<bool dynamic, int size, bool big_endian>
797 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::
798 local_section_offset() const
800 const unsigned int lsi = this->local_sym_index_;
801 section_offset_type offset;
802 Output_section* os = this->u1_.relobj->output_section(lsi, &offset);
803 gold_assert(os != NULL && offset != -1);
807 // Write out the offset and info fields of a Rel or Rela relocation
810 template<bool dynamic, int size, bool big_endian>
811 template<typename Write_rel>
813 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
816 Address address = this->address_;
817 if (this->shndx_ != INVALID_CODE)
819 section_offset_type off;
820 Output_section* os = this->u2_.relobj->output_section(this->shndx_,
822 gold_assert(os != NULL);
824 address += os->address() + off;
827 address = os->output_address(this->u2_.relobj, this->shndx_,
829 gold_assert(address != -1U);
832 else if (this->u2_.od != NULL)
833 address += this->u2_.od->address();
834 wr->put_r_offset(address);
835 unsigned int sym_index = this->is_relative_ ? 0 : this->get_symbol_index();
836 wr->put_r_info(elfcpp::elf_r_info<size>(sym_index, this->type_));
839 // Write out a Rel relocation.
841 template<bool dynamic, int size, bool big_endian>
843 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write(
844 unsigned char* pov) const
846 elfcpp::Rel_write<size, big_endian> orel(pov);
847 this->write_rel(&orel);
850 // Get the value of the symbol referred to by a Rel relocation.
852 template<bool dynamic, int size, bool big_endian>
853 typename elfcpp::Elf_types<size>::Elf_Addr
854 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::symbol_value(
855 Address addend) const
857 if (this->local_sym_index_ == GSYM_CODE)
859 const Sized_symbol<size>* sym;
860 sym = static_cast<const Sized_symbol<size>*>(this->u1_.gsym);
861 return sym->value() + addend;
863 gold_assert(this->local_sym_index_ != SECTION_CODE
864 && this->local_sym_index_ != INVALID_CODE
865 && !this->is_section_symbol_);
866 const unsigned int lsi = this->local_sym_index_;
867 const Symbol_value<size>* symval = this->u1_.relobj->local_symbol(lsi);
868 return symval->value(this->u1_.relobj, addend);
871 // Write out a Rela relocation.
873 template<bool dynamic, int size, bool big_endian>
875 Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write(
876 unsigned char* pov) const
878 elfcpp::Rela_write<size, big_endian> orel(pov);
879 this->rel_.write_rel(&orel);
880 Addend addend = this->addend_;
881 if (this->rel_.is_relative())
882 addend = this->rel_.symbol_value(addend);
883 else if (this->rel_.is_local_section_symbol())
884 addend += this->rel_.local_section_offset();
885 orel.put_r_addend(addend);
888 // Output_data_reloc_base methods.
890 // Adjust the output section.
892 template<int sh_type, bool dynamic, int size, bool big_endian>
894 Output_data_reloc_base<sh_type, dynamic, size, big_endian>
895 ::do_adjust_output_section(Output_section* os)
897 if (sh_type == elfcpp::SHT_REL)
898 os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
899 else if (sh_type == elfcpp::SHT_RELA)
900 os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
904 os->set_should_link_to_dynsym();
906 os->set_should_link_to_symtab();
909 // Write out relocation data.
911 template<int sh_type, bool dynamic, int size, bool big_endian>
913 Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write(
916 const off_t off = this->offset();
917 const off_t oview_size = this->data_size();
918 unsigned char* const oview = of->get_output_view(off, oview_size);
920 unsigned char* pov = oview;
921 for (typename Relocs::const_iterator p = this->relocs_.begin();
922 p != this->relocs_.end();
929 gold_assert(pov - oview == oview_size);
931 of->write_output_view(off, oview_size, oview);
933 // We no longer need the relocation entries.
934 this->relocs_.clear();
937 // Class Output_relocatable_relocs.
939 template<int sh_type, int size, bool big_endian>
941 Output_relocatable_relocs<sh_type, size, big_endian>::set_final_data_size()
943 this->set_data_size(this->rr_->output_reloc_count()
944 * Reloc_types<sh_type, size, big_endian>::reloc_size);
947 // class Output_data_group.
949 template<int size, bool big_endian>
950 Output_data_group<size, big_endian>::Output_data_group(
951 Sized_relobj<size, big_endian>* relobj,
952 section_size_type entry_count,
953 const elfcpp::Elf_Word* contents)
954 : Output_section_data(entry_count * 4, 4),
957 this->flags_ = elfcpp::Swap<32, big_endian>::readval(contents);
958 for (section_size_type i = 1; i < entry_count; ++i)
960 unsigned int shndx = elfcpp::Swap<32, big_endian>::readval(contents + i);
961 this->input_sections_.push_back(shndx);
965 // Write out the section group, which means translating the section
966 // indexes to apply to the output file.
968 template<int size, bool big_endian>
970 Output_data_group<size, big_endian>::do_write(Output_file* of)
972 const off_t off = this->offset();
973 const section_size_type oview_size =
974 convert_to_section_size_type(this->data_size());
975 unsigned char* const oview = of->get_output_view(off, oview_size);
977 elfcpp::Elf_Word* contents = reinterpret_cast<elfcpp::Elf_Word*>(oview);
978 elfcpp::Swap<32, big_endian>::writeval(contents, this->flags_);
981 for (std::vector<unsigned int>::const_iterator p =
982 this->input_sections_.begin();
983 p != this->input_sections_.end();
986 section_offset_type dummy;
987 Output_section* os = this->relobj_->output_section(*p, &dummy);
989 unsigned int output_shndx;
991 output_shndx = os->out_shndx();
994 this->relobj_->error(_("section group retained but "
995 "group element discarded"));
999 elfcpp::Swap<32, big_endian>::writeval(contents, output_shndx);
1002 size_t wrote = reinterpret_cast<unsigned char*>(contents) - oview;
1003 gold_assert(wrote == oview_size);
1005 of->write_output_view(off, oview_size, oview);
1007 // We no longer need this information.
1008 this->input_sections_.clear();
1011 // Output_data_got::Got_entry methods.
1013 // Write out the entry.
1015 template<int size, bool big_endian>
1017 Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
1021 switch (this->local_sym_index_)
1025 // If the symbol is resolved locally, we need to write out the
1026 // link-time value, which will be relocated dynamically by a
1027 // RELATIVE relocation.
1028 Symbol* gsym = this->u_.gsym;
1029 Sized_symbol<size>* sgsym;
1030 // This cast is a bit ugly. We don't want to put a
1031 // virtual method in Symbol, because we want Symbol to be
1032 // as small as possible.
1033 sgsym = static_cast<Sized_symbol<size>*>(gsym);
1034 val = sgsym->value();
1039 val = this->u_.constant;
1044 const unsigned int lsi = this->local_sym_index_;
1045 const Symbol_value<size>* symval = this->u_.object->local_symbol(lsi);
1046 val = symval->value(this->u_.object, 0);
1051 elfcpp::Swap<size, big_endian>::writeval(pov, val);
1054 // Output_data_got methods.
1056 // Add an entry for a global symbol to the GOT. This returns true if
1057 // this is a new GOT entry, false if the symbol already had a GOT
1060 template<int size, bool big_endian>
1062 Output_data_got<size, big_endian>::add_global(
1064 unsigned int got_type)
1066 if (gsym->has_got_offset(got_type))
1069 this->entries_.push_back(Got_entry(gsym));
1070 this->set_got_size();
1071 gsym->set_got_offset(got_type, this->last_got_offset());
1075 // Add an entry for a global symbol to the GOT, and add a dynamic
1076 // relocation of type R_TYPE for the GOT entry.
1077 template<int size, bool big_endian>
1079 Output_data_got<size, big_endian>::add_global_with_rel(
1081 unsigned int got_type,
1083 unsigned int r_type)
1085 if (gsym->has_got_offset(got_type))
1088 this->entries_.push_back(Got_entry());
1089 this->set_got_size();
1090 unsigned int got_offset = this->last_got_offset();
1091 gsym->set_got_offset(got_type, got_offset);
1092 rel_dyn->add_global(gsym, r_type, this, got_offset);
1095 template<int size, bool big_endian>
1097 Output_data_got<size, big_endian>::add_global_with_rela(
1099 unsigned int got_type,
1101 unsigned int r_type)
1103 if (gsym->has_got_offset(got_type))
1106 this->entries_.push_back(Got_entry());
1107 this->set_got_size();
1108 unsigned int got_offset = this->last_got_offset();
1109 gsym->set_got_offset(got_type, got_offset);
1110 rela_dyn->add_global(gsym, r_type, this, got_offset, 0);
1113 // Add a pair of entries for a global symbol to the GOT, and add
1114 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1115 // If R_TYPE_2 == 0, add the second entry with no relocation.
1116 template<int size, bool big_endian>
1118 Output_data_got<size, big_endian>::add_global_pair_with_rel(
1120 unsigned int got_type,
1122 unsigned int r_type_1,
1123 unsigned int r_type_2)
1125 if (gsym->has_got_offset(got_type))
1128 this->entries_.push_back(Got_entry());
1129 unsigned int got_offset = this->last_got_offset();
1130 gsym->set_got_offset(got_type, got_offset);
1131 rel_dyn->add_global(gsym, r_type_1, this, got_offset);
1133 this->entries_.push_back(Got_entry());
1136 got_offset = this->last_got_offset();
1137 rel_dyn->add_global(gsym, r_type_2, this, got_offset);
1140 this->set_got_size();
1143 template<int size, bool big_endian>
1145 Output_data_got<size, big_endian>::add_global_pair_with_rela(
1147 unsigned int got_type,
1149 unsigned int r_type_1,
1150 unsigned int r_type_2)
1152 if (gsym->has_got_offset(got_type))
1155 this->entries_.push_back(Got_entry());
1156 unsigned int got_offset = this->last_got_offset();
1157 gsym->set_got_offset(got_type, got_offset);
1158 rela_dyn->add_global(gsym, r_type_1, this, got_offset, 0);
1160 this->entries_.push_back(Got_entry());
1163 got_offset = this->last_got_offset();
1164 rela_dyn->add_global(gsym, r_type_2, this, got_offset, 0);
1167 this->set_got_size();
1170 // Add an entry for a local symbol to the GOT. This returns true if
1171 // this is a new GOT entry, false if the symbol already has a GOT
1174 template<int size, bool big_endian>
1176 Output_data_got<size, big_endian>::add_local(
1177 Sized_relobj<size, big_endian>* object,
1178 unsigned int symndx,
1179 unsigned int got_type)
1181 if (object->local_has_got_offset(symndx, got_type))
1184 this->entries_.push_back(Got_entry(object, symndx));
1185 this->set_got_size();
1186 object->set_local_got_offset(symndx, got_type, this->last_got_offset());
1190 // Add an entry for a local symbol to the GOT, and add a dynamic
1191 // relocation of type R_TYPE for the GOT entry.
1192 template<int size, bool big_endian>
1194 Output_data_got<size, big_endian>::add_local_with_rel(
1195 Sized_relobj<size, big_endian>* object,
1196 unsigned int symndx,
1197 unsigned int got_type,
1199 unsigned int r_type)
1201 if (object->local_has_got_offset(symndx, got_type))
1204 this->entries_.push_back(Got_entry());
1205 this->set_got_size();
1206 unsigned int got_offset = this->last_got_offset();
1207 object->set_local_got_offset(symndx, got_type, got_offset);
1208 rel_dyn->add_local(object, symndx, r_type, this, got_offset);
1211 template<int size, bool big_endian>
1213 Output_data_got<size, big_endian>::add_local_with_rela(
1214 Sized_relobj<size, big_endian>* object,
1215 unsigned int symndx,
1216 unsigned int got_type,
1218 unsigned int r_type)
1220 if (object->local_has_got_offset(symndx, got_type))
1223 this->entries_.push_back(Got_entry());
1224 this->set_got_size();
1225 unsigned int got_offset = this->last_got_offset();
1226 object->set_local_got_offset(symndx, got_type, got_offset);
1227 rela_dyn->add_local(object, symndx, r_type, this, got_offset, 0);
1230 // Add a pair of entries for a local symbol to the GOT, and add
1231 // dynamic relocations of type R_TYPE_1 and R_TYPE_2, respectively.
1232 // If R_TYPE_2 == 0, add the second entry with no relocation.
1233 template<int size, bool big_endian>
1235 Output_data_got<size, big_endian>::add_local_pair_with_rel(
1236 Sized_relobj<size, big_endian>* object,
1237 unsigned int symndx,
1239 unsigned int got_type,
1241 unsigned int r_type_1,
1242 unsigned int r_type_2)
1244 if (object->local_has_got_offset(symndx, got_type))
1247 this->entries_.push_back(Got_entry());
1248 unsigned int got_offset = this->last_got_offset();
1249 object->set_local_got_offset(symndx, got_type, got_offset);
1250 section_offset_type off;
1251 Output_section* os = object->output_section(shndx, &off);
1252 rel_dyn->add_output_section(os, r_type_1, this, got_offset);
1254 this->entries_.push_back(Got_entry(object, symndx));
1257 got_offset = this->last_got_offset();
1258 rel_dyn->add_output_section(os, r_type_2, this, got_offset);
1261 this->set_got_size();
1264 template<int size, bool big_endian>
1266 Output_data_got<size, big_endian>::add_local_pair_with_rela(
1267 Sized_relobj<size, big_endian>* object,
1268 unsigned int symndx,
1270 unsigned int got_type,
1272 unsigned int r_type_1,
1273 unsigned int r_type_2)
1275 if (object->local_has_got_offset(symndx, got_type))
1278 this->entries_.push_back(Got_entry());
1279 unsigned int got_offset = this->last_got_offset();
1280 object->set_local_got_offset(symndx, got_type, got_offset);
1281 section_offset_type off;
1282 Output_section* os = object->output_section(shndx, &off);
1283 rela_dyn->add_output_section(os, r_type_1, this, got_offset, 0);
1285 this->entries_.push_back(Got_entry(object, symndx));
1288 got_offset = this->last_got_offset();
1289 rela_dyn->add_output_section(os, r_type_2, this, got_offset, 0);
1292 this->set_got_size();
1295 // Write out the GOT.
1297 template<int size, bool big_endian>
1299 Output_data_got<size, big_endian>::do_write(Output_file* of)
1301 const int add = size / 8;
1303 const off_t off = this->offset();
1304 const off_t oview_size = this->data_size();
1305 unsigned char* const oview = of->get_output_view(off, oview_size);
1307 unsigned char* pov = oview;
1308 for (typename Got_entries::const_iterator p = this->entries_.begin();
1309 p != this->entries_.end();
1316 gold_assert(pov - oview == oview_size);
1318 of->write_output_view(off, oview_size, oview);
1320 // We no longer need the GOT entries.
1321 this->entries_.clear();
1324 // Output_data_dynamic::Dynamic_entry methods.
1326 // Write out the entry.
1328 template<int size, bool big_endian>
1330 Output_data_dynamic::Dynamic_entry::write(
1332 const Stringpool* pool) const
1334 typename elfcpp::Elf_types<size>::Elf_WXword val;
1335 switch (this->classification_)
1337 case DYNAMIC_NUMBER:
1341 case DYNAMIC_SECTION_ADDRESS:
1342 val = this->u_.od->address();
1345 case DYNAMIC_SECTION_SIZE:
1346 val = this->u_.od->data_size();
1349 case DYNAMIC_SYMBOL:
1351 const Sized_symbol<size>* s =
1352 static_cast<const Sized_symbol<size>*>(this->u_.sym);
1357 case DYNAMIC_STRING:
1358 val = pool->get_offset(this->u_.str);
1365 elfcpp::Dyn_write<size, big_endian> dw(pov);
1366 dw.put_d_tag(this->tag_);
1370 // Output_data_dynamic methods.
1372 // Adjust the output section to set the entry size.
1375 Output_data_dynamic::do_adjust_output_section(Output_section* os)
1377 if (parameters->target().get_size() == 32)
1378 os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
1379 else if (parameters->target().get_size() == 64)
1380 os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
1385 // Set the final data size.
1388 Output_data_dynamic::set_final_data_size()
1390 // Add the terminating entry.
1391 this->add_constant(elfcpp::DT_NULL, 0);
1394 if (parameters->target().get_size() == 32)
1395 dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
1396 else if (parameters->target().get_size() == 64)
1397 dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
1400 this->set_data_size(this->entries_.size() * dyn_size);
1403 // Write out the dynamic entries.
1406 Output_data_dynamic::do_write(Output_file* of)
1408 switch (parameters->size_and_endianness())
1410 #ifdef HAVE_TARGET_32_LITTLE
1411 case Parameters::TARGET_32_LITTLE:
1412 this->sized_write<32, false>(of);
1415 #ifdef HAVE_TARGET_32_BIG
1416 case Parameters::TARGET_32_BIG:
1417 this->sized_write<32, true>(of);
1420 #ifdef HAVE_TARGET_64_LITTLE
1421 case Parameters::TARGET_64_LITTLE:
1422 this->sized_write<64, false>(of);
1425 #ifdef HAVE_TARGET_64_BIG
1426 case Parameters::TARGET_64_BIG:
1427 this->sized_write<64, true>(of);
1435 template<int size, bool big_endian>
1437 Output_data_dynamic::sized_write(Output_file* of)
1439 const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
1441 const off_t offset = this->offset();
1442 const off_t oview_size = this->data_size();
1443 unsigned char* const oview = of->get_output_view(offset, oview_size);
1445 unsigned char* pov = oview;
1446 for (typename Dynamic_entries::const_iterator p = this->entries_.begin();
1447 p != this->entries_.end();
1450 p->write<size, big_endian>(pov, this->pool_);
1454 gold_assert(pov - oview == oview_size);
1456 of->write_output_view(offset, oview_size, oview);
1458 // We no longer need the dynamic entries.
1459 this->entries_.clear();
1462 // Output_section::Input_section methods.
1464 // Return the data size. For an input section we store the size here.
1465 // For an Output_section_data, we have to ask it for the size.
1468 Output_section::Input_section::data_size() const
1470 if (this->is_input_section())
1471 return this->u1_.data_size;
1473 return this->u2_.posd->data_size();
1476 // Set the address and file offset.
1479 Output_section::Input_section::set_address_and_file_offset(
1482 off_t section_file_offset)
1484 if (this->is_input_section())
1485 this->u2_.object->set_section_offset(this->shndx_,
1486 file_offset - section_file_offset);
1488 this->u2_.posd->set_address_and_file_offset(address, file_offset);
1491 // Reset the address and file offset.
1494 Output_section::Input_section::reset_address_and_file_offset()
1496 if (!this->is_input_section())
1497 this->u2_.posd->reset_address_and_file_offset();
1500 // Finalize the data size.
1503 Output_section::Input_section::finalize_data_size()
1505 if (!this->is_input_section())
1506 this->u2_.posd->finalize_data_size();
1509 // Try to turn an input offset into an output offset. We want to
1510 // return the output offset relative to the start of this
1511 // Input_section in the output section.
1514 Output_section::Input_section::output_offset(
1515 const Relobj* object,
1517 section_offset_type offset,
1518 section_offset_type *poutput) const
1520 if (!this->is_input_section())
1521 return this->u2_.posd->output_offset(object, shndx, offset, poutput);
1524 if (this->shndx_ != shndx || this->u2_.object != object)
1531 // Return whether this is the merge section for the input section
1535 Output_section::Input_section::is_merge_section_for(const Relobj* object,
1536 unsigned int shndx) const
1538 if (this->is_input_section())
1540 return this->u2_.posd->is_merge_section_for(object, shndx);
1543 // Write out the data. We don't have to do anything for an input
1544 // section--they are handled via Object::relocate--but this is where
1545 // we write out the data for an Output_section_data.
1548 Output_section::Input_section::write(Output_file* of)
1550 if (!this->is_input_section())
1551 this->u2_.posd->write(of);
1554 // Write the data to a buffer. As for write(), we don't have to do
1555 // anything for an input section.
1558 Output_section::Input_section::write_to_buffer(unsigned char* buffer)
1560 if (!this->is_input_section())
1561 this->u2_.posd->write_to_buffer(buffer);
1564 // Output_section methods.
1566 // Construct an Output_section. NAME will point into a Stringpool.
1568 Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
1569 elfcpp::Elf_Xword flags)
1574 link_section_(NULL),
1576 info_section_(NULL),
1585 first_input_offset_(0),
1587 postprocessing_buffer_(NULL),
1588 needs_symtab_index_(false),
1589 needs_dynsym_index_(false),
1590 should_link_to_symtab_(false),
1591 should_link_to_dynsym_(false),
1592 after_input_sections_(false),
1593 requires_postprocessing_(false),
1594 found_in_sections_clause_(false),
1595 has_load_address_(false),
1596 info_uses_section_index_(false),
1599 // An unallocated section has no address. Forcing this means that
1600 // we don't need special treatment for symbols defined in debug
1602 if ((flags & elfcpp::SHF_ALLOC) == 0)
1603 this->set_address(0);
1606 Output_section::~Output_section()
1610 // Set the entry size.
1613 Output_section::set_entsize(uint64_t v)
1615 if (this->entsize_ == 0)
1618 gold_assert(this->entsize_ == v);
1621 // Add the input section SHNDX, with header SHDR, named SECNAME, in
1622 // OBJECT, to the Output_section. RELOC_SHNDX is the index of a
1623 // relocation section which applies to this section, or 0 if none, or
1624 // -1U if more than one. Return the offset of the input section
1625 // within the output section. Return -1 if the input section will
1626 // receive special handling. In the normal case we don't always keep
1627 // track of input sections for an Output_section. Instead, each
1628 // Object keeps track of the Output_section for each of its input
1629 // sections. However, if HAVE_SECTIONS_SCRIPT is true, we do keep
1630 // track of input sections here; this is used when SECTIONS appears in
1633 template<int size, bool big_endian>
1635 Output_section::add_input_section(Sized_relobj<size, big_endian>* object,
1637 const char* secname,
1638 const elfcpp::Shdr<size, big_endian>& shdr,
1639 unsigned int reloc_shndx,
1640 bool have_sections_script)
1642 elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
1643 if ((addralign & (addralign - 1)) != 0)
1645 object->error(_("invalid alignment %lu for section \"%s\""),
1646 static_cast<unsigned long>(addralign), secname);
1650 if (addralign > this->addralign_)
1651 this->addralign_ = addralign;
1653 typename elfcpp::Elf_types<size>::Elf_WXword sh_flags = shdr.get_sh_flags();
1654 this->flags_ |= (sh_flags
1655 & (elfcpp::SHF_WRITE
1657 | elfcpp::SHF_EXECINSTR));
1659 uint64_t entsize = shdr.get_sh_entsize();
1661 // .debug_str is a mergeable string section, but is not always so
1662 // marked by compilers. Mark manually here so we can optimize.
1663 if (strcmp(secname, ".debug_str") == 0)
1665 sh_flags |= (elfcpp::SHF_MERGE | elfcpp::SHF_STRINGS);
1669 // If this is a SHF_MERGE section, we pass all the input sections to
1670 // a Output_data_merge. We don't try to handle relocations for such
1672 if ((sh_flags & elfcpp::SHF_MERGE) != 0
1673 && reloc_shndx == 0)
1675 if (this->add_merge_input_section(object, shndx, sh_flags,
1676 entsize, addralign))
1678 // Tell the relocation routines that they need to call the
1679 // output_offset method to determine the final address.
1684 off_t offset_in_section = this->current_data_size_for_child();
1685 off_t aligned_offset_in_section = align_address(offset_in_section,
1688 if (aligned_offset_in_section > offset_in_section
1689 && !have_sections_script
1690 && (sh_flags & elfcpp::SHF_EXECINSTR) != 0
1691 && object->target()->has_code_fill())
1693 // We need to add some fill data. Using fill_list_ when
1694 // possible is an optimization, since we will often have fill
1695 // sections without input sections.
1696 off_t fill_len = aligned_offset_in_section - offset_in_section;
1697 if (this->input_sections_.empty())
1698 this->fills_.push_back(Fill(offset_in_section, fill_len));
1701 // FIXME: When relaxing, the size needs to adjust to
1702 // maintain a constant alignment.
1703 std::string fill_data(object->target()->code_fill(fill_len));
1704 Output_data_const* odc = new Output_data_const(fill_data, 1);
1705 this->input_sections_.push_back(Input_section(odc));
1709 this->set_current_data_size_for_child(aligned_offset_in_section
1710 + shdr.get_sh_size());
1712 // We need to keep track of this section if we are already keeping
1713 // track of sections, or if we are relaxing. FIXME: Add test for
1715 if (have_sections_script || !this->input_sections_.empty())
1716 this->input_sections_.push_back(Input_section(object, shndx,
1720 return aligned_offset_in_section;
1723 // Add arbitrary data to an output section.
1726 Output_section::add_output_section_data(Output_section_data* posd)
1728 Input_section inp(posd);
1729 this->add_output_section_data(&inp);
1731 if (posd->is_data_size_valid())
1733 off_t offset_in_section = this->current_data_size_for_child();
1734 off_t aligned_offset_in_section = align_address(offset_in_section,
1736 this->set_current_data_size_for_child(aligned_offset_in_section
1737 + posd->data_size());
1741 // Add arbitrary data to an output section by Input_section.
1744 Output_section::add_output_section_data(Input_section* inp)
1746 if (this->input_sections_.empty())
1747 this->first_input_offset_ = this->current_data_size_for_child();
1749 this->input_sections_.push_back(*inp);
1751 uint64_t addralign = inp->addralign();
1752 if (addralign > this->addralign_)
1753 this->addralign_ = addralign;
1755 inp->set_output_section(this);
1758 // Add a merge section to an output section.
1761 Output_section::add_output_merge_section(Output_section_data* posd,
1762 bool is_string, uint64_t entsize)
1764 Input_section inp(posd, is_string, entsize);
1765 this->add_output_section_data(&inp);
1768 // Add an input section to a SHF_MERGE section.
1771 Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
1772 uint64_t flags, uint64_t entsize,
1775 bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
1777 // We only merge strings if the alignment is not more than the
1778 // character size. This could be handled, but it's unusual.
1779 if (is_string && addralign > entsize)
1782 Input_section_list::iterator p;
1783 for (p = this->input_sections_.begin();
1784 p != this->input_sections_.end();
1786 if (p->is_merge_section(is_string, entsize, addralign))
1788 p->add_input_section(object, shndx);
1792 // We handle the actual constant merging in Output_merge_data or
1793 // Output_merge_string_data.
1794 Output_section_data* posd;
1796 posd = new Output_merge_data(entsize, addralign);
1802 posd = new Output_merge_string<char>(addralign);
1805 posd = new Output_merge_string<uint16_t>(addralign);
1808 posd = new Output_merge_string<uint32_t>(addralign);
1815 this->add_output_merge_section(posd, is_string, entsize);
1816 posd->add_input_section(object, shndx);
1821 // Given an address OFFSET relative to the start of input section
1822 // SHNDX in OBJECT, return whether this address is being included in
1823 // the final link. This should only be called if SHNDX in OBJECT has
1824 // a special mapping.
1827 Output_section::is_input_address_mapped(const Relobj* object,
1831 gold_assert(object->is_section_specially_mapped(shndx));
1833 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1834 p != this->input_sections_.end();
1837 section_offset_type output_offset;
1838 if (p->output_offset(object, shndx, offset, &output_offset))
1839 return output_offset != -1;
1842 // By default we assume that the address is mapped. This should
1843 // only be called after we have passed all sections to Layout. At
1844 // that point we should know what we are discarding.
1848 // Given an address OFFSET relative to the start of input section
1849 // SHNDX in object OBJECT, return the output offset relative to the
1850 // start of the input section in the output section. This should only
1851 // be called if SHNDX in OBJECT has a special mapping.
1854 Output_section::output_offset(const Relobj* object, unsigned int shndx,
1855 section_offset_type offset) const
1857 gold_assert(object->is_section_specially_mapped(shndx));
1858 // This can only be called meaningfully when layout is complete.
1859 gold_assert(Output_data::is_layout_complete());
1861 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1862 p != this->input_sections_.end();
1865 section_offset_type output_offset;
1866 if (p->output_offset(object, shndx, offset, &output_offset))
1867 return output_offset;
1872 // Return the output virtual address of OFFSET relative to the start
1873 // of input section SHNDX in object OBJECT.
1876 Output_section::output_address(const Relobj* object, unsigned int shndx,
1879 gold_assert(object->is_section_specially_mapped(shndx));
1881 uint64_t addr = this->address() + this->first_input_offset_;
1882 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1883 p != this->input_sections_.end();
1886 addr = align_address(addr, p->addralign());
1887 section_offset_type output_offset;
1888 if (p->output_offset(object, shndx, offset, &output_offset))
1890 if (output_offset == -1)
1892 return addr + output_offset;
1894 addr += p->data_size();
1897 // If we get here, it means that we don't know the mapping for this
1898 // input section. This might happen in principle if
1899 // add_input_section were called before add_output_section_data.
1900 // But it should never actually happen.
1905 // Return the output address of the start of the merged section for
1906 // input section SHNDX in object OBJECT.
1909 Output_section::starting_output_address(const Relobj* object,
1910 unsigned int shndx) const
1912 gold_assert(object->is_section_specially_mapped(shndx));
1914 uint64_t addr = this->address() + this->first_input_offset_;
1915 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1916 p != this->input_sections_.end();
1919 addr = align_address(addr, p->addralign());
1921 // It would be nice if we could use the existing output_offset
1922 // method to get the output offset of input offset 0.
1923 // Unfortunately we don't know for sure that input offset 0 is
1925 if (p->is_merge_section_for(object, shndx))
1928 addr += p->data_size();
1933 // Set the data size of an Output_section. This is where we handle
1934 // setting the addresses of any Output_section_data objects.
1937 Output_section::set_final_data_size()
1939 if (this->input_sections_.empty())
1941 this->set_data_size(this->current_data_size_for_child());
1945 uint64_t address = this->address();
1946 off_t startoff = this->offset();
1947 off_t off = startoff + this->first_input_offset_;
1948 for (Input_section_list::iterator p = this->input_sections_.begin();
1949 p != this->input_sections_.end();
1952 off = align_address(off, p->addralign());
1953 p->set_address_and_file_offset(address + (off - startoff), off,
1955 off += p->data_size();
1958 this->set_data_size(off - startoff);
1961 // Reset the address and file offset.
1964 Output_section::do_reset_address_and_file_offset()
1966 for (Input_section_list::iterator p = this->input_sections_.begin();
1967 p != this->input_sections_.end();
1969 p->reset_address_and_file_offset();
1972 // Set the TLS offset. Called only for SHT_TLS sections.
1975 Output_section::do_set_tls_offset(uint64_t tls_base)
1977 this->tls_offset_ = this->address() - tls_base;
1980 // Write the section header to *OSHDR.
1982 template<int size, bool big_endian>
1984 Output_section::write_header(const Layout* layout,
1985 const Stringpool* secnamepool,
1986 elfcpp::Shdr_write<size, big_endian>* oshdr) const
1988 oshdr->put_sh_name(secnamepool->get_offset(this->name_));
1989 oshdr->put_sh_type(this->type_);
1991 elfcpp::Elf_Xword flags = this->flags_;
1992 if (this->info_section_ != NULL && this->info_uses_section_index_)
1993 flags |= elfcpp::SHF_INFO_LINK;
1994 oshdr->put_sh_flags(flags);
1996 oshdr->put_sh_addr(this->address());
1997 oshdr->put_sh_offset(this->offset());
1998 oshdr->put_sh_size(this->data_size());
1999 if (this->link_section_ != NULL)
2000 oshdr->put_sh_link(this->link_section_->out_shndx());
2001 else if (this->should_link_to_symtab_)
2002 oshdr->put_sh_link(layout->symtab_section()->out_shndx());
2003 else if (this->should_link_to_dynsym_)
2004 oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
2006 oshdr->put_sh_link(this->link_);
2008 elfcpp::Elf_Word info;
2009 if (this->info_section_ != NULL)
2011 if (this->info_uses_section_index_)
2012 info = this->info_section_->out_shndx();
2014 info = this->info_section_->symtab_index();
2016 else if (this->info_symndx_ != NULL)
2017 info = this->info_symndx_->symtab_index();
2020 oshdr->put_sh_info(info);
2022 oshdr->put_sh_addralign(this->addralign_);
2023 oshdr->put_sh_entsize(this->entsize_);
2026 // Write out the data. For input sections the data is written out by
2027 // Object::relocate, but we have to handle Output_section_data objects
2031 Output_section::do_write(Output_file* of)
2033 gold_assert(!this->requires_postprocessing());
2035 off_t output_section_file_offset = this->offset();
2036 for (Fill_list::iterator p = this->fills_.begin();
2037 p != this->fills_.end();
2040 std::string fill_data(parameters->target().code_fill(p->length()));
2041 of->write(output_section_file_offset + p->section_offset(),
2042 fill_data.data(), fill_data.size());
2045 for (Input_section_list::iterator p = this->input_sections_.begin();
2046 p != this->input_sections_.end();
2051 // If a section requires postprocessing, create the buffer to use.
2054 Output_section::create_postprocessing_buffer()
2056 gold_assert(this->requires_postprocessing());
2058 if (this->postprocessing_buffer_ != NULL)
2061 if (!this->input_sections_.empty())
2063 off_t off = this->first_input_offset_;
2064 for (Input_section_list::iterator p = this->input_sections_.begin();
2065 p != this->input_sections_.end();
2068 off = align_address(off, p->addralign());
2069 p->finalize_data_size();
2070 off += p->data_size();
2072 this->set_current_data_size_for_child(off);
2075 off_t buffer_size = this->current_data_size_for_child();
2076 this->postprocessing_buffer_ = new unsigned char[buffer_size];
2079 // Write all the data of an Output_section into the postprocessing
2080 // buffer. This is used for sections which require postprocessing,
2081 // such as compression. Input sections are handled by
2082 // Object::Relocate.
2085 Output_section::write_to_postprocessing_buffer()
2087 gold_assert(this->requires_postprocessing());
2089 unsigned char* buffer = this->postprocessing_buffer();
2090 for (Fill_list::iterator p = this->fills_.begin();
2091 p != this->fills_.end();
2094 std::string fill_data(parameters->target().code_fill(p->length()));
2095 memcpy(buffer + p->section_offset(), fill_data.data(),
2099 off_t off = this->first_input_offset_;
2100 for (Input_section_list::iterator p = this->input_sections_.begin();
2101 p != this->input_sections_.end();
2104 off = align_address(off, p->addralign());
2105 p->write_to_buffer(buffer + off);
2106 off += p->data_size();
2110 // Get the input sections for linker script processing. We leave
2111 // behind the Output_section_data entries. Note that this may be
2112 // slightly incorrect for merge sections. We will leave them behind,
2113 // but it is possible that the script says that they should follow
2114 // some other input sections, as in:
2115 // .rodata { *(.rodata) *(.rodata.cst*) }
2116 // For that matter, we don't handle this correctly:
2117 // .rodata { foo.o(.rodata.cst*) *(.rodata.cst*) }
2118 // With luck this will never matter.
2121 Output_section::get_input_sections(
2123 const std::string& fill,
2124 std::list<std::pair<Relobj*, unsigned int> >* input_sections)
2126 uint64_t orig_address = address;
2128 address = align_address(address, this->addralign());
2130 Input_section_list remaining;
2131 for (Input_section_list::iterator p = this->input_sections_.begin();
2132 p != this->input_sections_.end();
2135 if (p->is_input_section())
2136 input_sections->push_back(std::make_pair(p->relobj(), p->shndx()));
2139 uint64_t aligned_address = align_address(address, p->addralign());
2140 if (aligned_address != address && !fill.empty())
2142 section_size_type length =
2143 convert_to_section_size_type(aligned_address - address);
2144 std::string this_fill;
2145 this_fill.reserve(length);
2146 while (this_fill.length() + fill.length() <= length)
2148 if (this_fill.length() < length)
2149 this_fill.append(fill, 0, length - this_fill.length());
2151 Output_section_data* posd = new Output_data_const(this_fill, 0);
2152 remaining.push_back(Input_section(posd));
2154 address = aligned_address;
2156 remaining.push_back(*p);
2158 p->finalize_data_size();
2159 address += p->data_size();
2163 this->input_sections_.swap(remaining);
2164 this->first_input_offset_ = 0;
2166 uint64_t data_size = address - orig_address;
2167 this->set_current_data_size_for_child(data_size);
2171 // Add an input section from a script.
2174 Output_section::add_input_section_for_script(Relobj* object,
2179 if (addralign > this->addralign_)
2180 this->addralign_ = addralign;
2182 off_t offset_in_section = this->current_data_size_for_child();
2183 off_t aligned_offset_in_section = align_address(offset_in_section,
2186 this->set_current_data_size_for_child(aligned_offset_in_section
2189 this->input_sections_.push_back(Input_section(object, shndx,
2190 data_size, addralign));
2193 // Print stats for merge sections to stderr.
2196 Output_section::print_merge_stats()
2198 Input_section_list::iterator p;
2199 for (p = this->input_sections_.begin();
2200 p != this->input_sections_.end();
2202 p->print_merge_stats(this->name_);
2205 // Output segment methods.
2207 Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
2219 is_max_align_known_(false),
2220 are_addresses_set_(false)
2224 // Add an Output_section to an Output_segment.
2227 Output_segment::add_output_section(Output_section* os,
2228 elfcpp::Elf_Word seg_flags,
2231 gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
2232 gold_assert(!this->is_max_align_known_);
2234 // Update the segment flags.
2235 this->flags_ |= seg_flags;
2237 Output_segment::Output_data_list* pdl;
2238 if (os->type() == elfcpp::SHT_NOBITS)
2239 pdl = &this->output_bss_;
2241 pdl = &this->output_data_;
2243 // So that PT_NOTE segments will work correctly, we need to ensure
2244 // that all SHT_NOTE sections are adjacent. This will normally
2245 // happen automatically, because all the SHT_NOTE input sections
2246 // will wind up in the same output section. However, it is possible
2247 // for multiple SHT_NOTE input sections to have different section
2248 // flags, and thus be in different output sections, but for the
2249 // different section flags to map into the same segment flags and
2250 // thus the same output segment.
2252 // Note that while there may be many input sections in an output
2253 // section, there are normally only a few output sections in an
2254 // output segment. This loop is expected to be fast.
2256 if (os->type() == elfcpp::SHT_NOTE && !pdl->empty())
2258 Output_segment::Output_data_list::iterator p = pdl->end();
2262 if ((*p)->is_section_type(elfcpp::SHT_NOTE))
2264 // We don't worry about the FRONT parameter.
2270 while (p != pdl->begin());
2273 // Similarly, so that PT_TLS segments will work, we need to group
2274 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
2275 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
2276 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
2277 // correctly. SHF_TLS sections get added to both a PT_LOAD segment
2278 // and the PT_TLS segment -- we do this grouping only for the
2280 if (this->type_ != elfcpp::PT_TLS
2281 && (os->flags() & elfcpp::SHF_TLS) != 0
2282 && !this->output_data_.empty())
2284 pdl = &this->output_data_;
2285 bool nobits = os->type() == elfcpp::SHT_NOBITS;
2286 bool sawtls = false;
2287 Output_segment::Output_data_list::iterator p = pdl->end();
2292 if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
2295 // Put a NOBITS section after the first TLS section.
2296 // But a PROGBITS section after the first TLS/PROGBITS
2298 insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
2302 // If we've gone past the TLS sections, but we've seen a
2303 // TLS section, then we need to insert this section now.
2309 // We don't worry about the FRONT parameter.
2315 while (p != pdl->begin());
2317 // There are no TLS sections yet; put this one at the requested
2318 // location in the section list.
2322 pdl->push_front(os);
2327 // Remove an Output_section from this segment. It is an error if it
2331 Output_segment::remove_output_section(Output_section* os)
2333 // We only need this for SHT_PROGBITS.
2334 gold_assert(os->type() == elfcpp::SHT_PROGBITS);
2335 for (Output_data_list::iterator p = this->output_data_.begin();
2336 p != this->output_data_.end();
2341 this->output_data_.erase(p);
2348 // Add an Output_data (which is not an Output_section) to the start of
2352 Output_segment::add_initial_output_data(Output_data* od)
2354 gold_assert(!this->is_max_align_known_);
2355 this->output_data_.push_front(od);
2358 // Return the maximum alignment of the Output_data in Output_segment.
2361 Output_segment::maximum_alignment()
2363 if (!this->is_max_align_known_)
2367 addralign = Output_segment::maximum_alignment_list(&this->output_data_);
2368 if (addralign > this->max_align_)
2369 this->max_align_ = addralign;
2371 addralign = Output_segment::maximum_alignment_list(&this->output_bss_);
2372 if (addralign > this->max_align_)
2373 this->max_align_ = addralign;
2375 this->is_max_align_known_ = true;
2378 return this->max_align_;
2381 // Return the maximum alignment of a list of Output_data.
2384 Output_segment::maximum_alignment_list(const Output_data_list* pdl)
2387 for (Output_data_list::const_iterator p = pdl->begin();
2391 uint64_t addralign = (*p)->addralign();
2392 if (addralign > ret)
2398 // Return the number of dynamic relocs applied to this segment.
2401 Output_segment::dynamic_reloc_count() const
2403 return (this->dynamic_reloc_count_list(&this->output_data_)
2404 + this->dynamic_reloc_count_list(&this->output_bss_));
2407 // Return the number of dynamic relocs applied to an Output_data_list.
2410 Output_segment::dynamic_reloc_count_list(const Output_data_list* pdl) const
2412 unsigned int count = 0;
2413 for (Output_data_list::const_iterator p = pdl->begin();
2416 count += (*p)->dynamic_reloc_count();
2420 // Set the section addresses for an Output_segment. If RESET is true,
2421 // reset the addresses first. ADDR is the address and *POFF is the
2422 // file offset. Set the section indexes starting with *PSHNDX.
2423 // Return the address of the immediately following segment. Update
2424 // *POFF and *PSHNDX.
2427 Output_segment::set_section_addresses(const Layout* layout, bool reset,
2428 uint64_t addr, off_t* poff,
2429 unsigned int* pshndx)
2431 gold_assert(this->type_ == elfcpp::PT_LOAD);
2433 if (!reset && this->are_addresses_set_)
2435 gold_assert(this->paddr_ == addr);
2436 addr = this->vaddr_;
2440 this->vaddr_ = addr;
2441 this->paddr_ = addr;
2442 this->are_addresses_set_ = true;
2445 bool in_tls = false;
2447 off_t orig_off = *poff;
2448 this->offset_ = orig_off;
2450 addr = this->set_section_list_addresses(layout, reset, &this->output_data_,
2451 addr, poff, pshndx, &in_tls);
2452 this->filesz_ = *poff - orig_off;
2456 uint64_t ret = this->set_section_list_addresses(layout, reset,
2461 // If the last section was a TLS section, align upward to the
2462 // alignment of the TLS segment, so that the overall size of the TLS
2463 // segment is aligned.
2466 uint64_t segment_align = layout->tls_segment()->maximum_alignment();
2467 *poff = align_address(*poff, segment_align);
2470 this->memsz_ = *poff - orig_off;
2472 // Ignore the file offset adjustments made by the BSS Output_data
2479 // Set the addresses and file offsets in a list of Output_data
2483 Output_segment::set_section_list_addresses(const Layout* layout, bool reset,
2484 Output_data_list* pdl,
2485 uint64_t addr, off_t* poff,
2486 unsigned int* pshndx,
2489 off_t startoff = *poff;
2491 off_t off = startoff;
2492 for (Output_data_list::iterator p = pdl->begin();
2497 (*p)->reset_address_and_file_offset();
2499 // When using a linker script the section will most likely
2500 // already have an address.
2501 if (!(*p)->is_address_valid())
2503 uint64_t align = (*p)->addralign();
2505 if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
2507 // Give the first TLS section the alignment of the
2508 // entire TLS segment. Otherwise the TLS segment as a
2509 // whole may be misaligned.
2512 Output_segment* tls_segment = layout->tls_segment();
2513 gold_assert(tls_segment != NULL);
2514 uint64_t segment_align = tls_segment->maximum_alignment();
2515 gold_assert(segment_align >= align);
2516 align = segment_align;
2523 // If this is the first section after the TLS segment,
2524 // align it to at least the alignment of the TLS
2525 // segment, so that the size of the overall TLS segment
2529 uint64_t segment_align =
2530 layout->tls_segment()->maximum_alignment();
2531 if (segment_align > align)
2532 align = segment_align;
2538 off = align_address(off, align);
2539 (*p)->set_address_and_file_offset(addr + (off - startoff), off);
2543 // The script may have inserted a skip forward, but it
2544 // better not have moved backward.
2545 gold_assert((*p)->address() >= addr + (off - startoff));
2546 off += (*p)->address() - (addr + (off - startoff));
2547 (*p)->set_file_offset(off);
2548 (*p)->finalize_data_size();
2551 // We want to ignore the size of a SHF_TLS or SHT_NOBITS
2552 // section. Such a section does not affect the size of a
2554 if (!(*p)->is_section_flag_set(elfcpp::SHF_TLS)
2555 || !(*p)->is_section_type(elfcpp::SHT_NOBITS))
2556 off += (*p)->data_size();
2558 if ((*p)->is_section())
2560 (*p)->set_out_shndx(*pshndx);
2566 return addr + (off - startoff);
2569 // For a non-PT_LOAD segment, set the offset from the sections, if
2573 Output_segment::set_offset()
2575 gold_assert(this->type_ != elfcpp::PT_LOAD);
2577 gold_assert(!this->are_addresses_set_);
2579 if (this->output_data_.empty() && this->output_bss_.empty())
2583 this->are_addresses_set_ = true;
2585 this->min_p_align_ = 0;
2591 const Output_data* first;
2592 if (this->output_data_.empty())
2593 first = this->output_bss_.front();
2595 first = this->output_data_.front();
2596 this->vaddr_ = first->address();
2597 this->paddr_ = (first->has_load_address()
2598 ? first->load_address()
2600 this->are_addresses_set_ = true;
2601 this->offset_ = first->offset();
2603 if (this->output_data_.empty())
2607 const Output_data* last_data = this->output_data_.back();
2608 this->filesz_ = (last_data->address()
2609 + last_data->data_size()
2613 const Output_data* last;
2614 if (this->output_bss_.empty())
2615 last = this->output_data_.back();
2617 last = this->output_bss_.back();
2618 this->memsz_ = (last->address()
2622 // If this is a TLS segment, align the memory size. The code in
2623 // set_section_list ensures that the section after the TLS segment
2624 // is aligned to give us room.
2625 if (this->type_ == elfcpp::PT_TLS)
2627 uint64_t segment_align = this->maximum_alignment();
2628 gold_assert(this->vaddr_ == align_address(this->vaddr_, segment_align));
2629 this->memsz_ = align_address(this->memsz_, segment_align);
2633 // Set the TLS offsets of the sections in the PT_TLS segment.
2636 Output_segment::set_tls_offsets()
2638 gold_assert(this->type_ == elfcpp::PT_TLS);
2640 for (Output_data_list::iterator p = this->output_data_.begin();
2641 p != this->output_data_.end();
2643 (*p)->set_tls_offset(this->vaddr_);
2645 for (Output_data_list::iterator p = this->output_bss_.begin();
2646 p != this->output_bss_.end();
2648 (*p)->set_tls_offset(this->vaddr_);
2651 // Return the address of the first section.
2654 Output_segment::first_section_load_address() const
2656 for (Output_data_list::const_iterator p = this->output_data_.begin();
2657 p != this->output_data_.end();
2659 if ((*p)->is_section())
2660 return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address();
2662 for (Output_data_list::const_iterator p = this->output_bss_.begin();
2663 p != this->output_bss_.end();
2665 if ((*p)->is_section())
2666 return (*p)->has_load_address() ? (*p)->load_address() : (*p)->address();
2671 // Return the number of Output_sections in an Output_segment.
2674 Output_segment::output_section_count() const
2676 return (this->output_section_count_list(&this->output_data_)
2677 + this->output_section_count_list(&this->output_bss_));
2680 // Return the number of Output_sections in an Output_data_list.
2683 Output_segment::output_section_count_list(const Output_data_list* pdl) const
2685 unsigned int count = 0;
2686 for (Output_data_list::const_iterator p = pdl->begin();
2690 if ((*p)->is_section())
2696 // Return the section attached to the list segment with the lowest
2697 // load address. This is used when handling a PHDRS clause in a
2701 Output_segment::section_with_lowest_load_address() const
2703 Output_section* found = NULL;
2704 uint64_t found_lma = 0;
2705 this->lowest_load_address_in_list(&this->output_data_, &found, &found_lma);
2707 Output_section* found_data = found;
2708 this->lowest_load_address_in_list(&this->output_bss_, &found, &found_lma);
2709 if (found != found_data && found_data != NULL)
2711 gold_error(_("nobits section %s may not precede progbits section %s "
2713 found->name(), found_data->name());
2720 // Look through a list for a section with a lower load address.
2723 Output_segment::lowest_load_address_in_list(const Output_data_list* pdl,
2724 Output_section** found,
2725 uint64_t* found_lma) const
2727 for (Output_data_list::const_iterator p = pdl->begin();
2731 if (!(*p)->is_section())
2733 Output_section* os = static_cast<Output_section*>(*p);
2734 uint64_t lma = (os->has_load_address()
2735 ? os->load_address()
2737 if (*found == NULL || lma < *found_lma)
2745 // Write the segment data into *OPHDR.
2747 template<int size, bool big_endian>
2749 Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr)
2751 ophdr->put_p_type(this->type_);
2752 ophdr->put_p_offset(this->offset_);
2753 ophdr->put_p_vaddr(this->vaddr_);
2754 ophdr->put_p_paddr(this->paddr_);
2755 ophdr->put_p_filesz(this->filesz_);
2756 ophdr->put_p_memsz(this->memsz_);
2757 ophdr->put_p_flags(this->flags_);
2758 ophdr->put_p_align(std::max(this->min_p_align_, this->maximum_alignment()));
2761 // Write the section headers into V.
2763 template<int size, bool big_endian>
2765 Output_segment::write_section_headers(const Layout* layout,
2766 const Stringpool* secnamepool,
2768 unsigned int *pshndx) const
2770 // Every section that is attached to a segment must be attached to a
2771 // PT_LOAD segment, so we only write out section headers for PT_LOAD
2773 if (this->type_ != elfcpp::PT_LOAD)
2776 v = this->write_section_headers_list<size, big_endian>(layout, secnamepool,
2777 &this->output_data_,
2779 v = this->write_section_headers_list<size, big_endian>(layout, secnamepool,
2785 template<int size, bool big_endian>
2787 Output_segment::write_section_headers_list(const Layout* layout,
2788 const Stringpool* secnamepool,
2789 const Output_data_list* pdl,
2791 unsigned int* pshndx) const
2793 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
2794 for (Output_data_list::const_iterator p = pdl->begin();
2798 if ((*p)->is_section())
2800 const Output_section* ps = static_cast<const Output_section*>(*p);
2801 gold_assert(*pshndx == ps->out_shndx());
2802 elfcpp::Shdr_write<size, big_endian> oshdr(v);
2803 ps->write_header(layout, secnamepool, &oshdr);
2811 // Output_file methods.
2813 Output_file::Output_file(const char* name)
2818 map_is_anonymous_(false),
2819 is_temporary_(false)
2823 // Open the output file.
2826 Output_file::open(off_t file_size)
2828 this->file_size_ = file_size;
2830 // Unlink the file first; otherwise the open() may fail if the file
2831 // is busy (e.g. it's an executable that's currently being executed).
2833 // However, the linker may be part of a system where a zero-length
2834 // file is created for it to write to, with tight permissions (gcc
2835 // 2.95 did something like this). Unlinking the file would work
2836 // around those permission controls, so we only unlink if the file
2837 // has a non-zero size. We also unlink only regular files to avoid
2838 // trouble with directories/etc.
2840 // If we fail, continue; this command is merely a best-effort attempt
2841 // to improve the odds for open().
2843 // We let the name "-" mean "stdout"
2844 if (!this->is_temporary_)
2846 if (strcmp(this->name_, "-") == 0)
2847 this->o_ = STDOUT_FILENO;
2851 if (::stat(this->name_, &s) == 0 && s.st_size != 0)
2852 unlink_if_ordinary(this->name_);
2854 int mode = parameters->options().relocatable() ? 0666 : 0777;
2855 int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
2857 gold_fatal(_("%s: open: %s"), this->name_, strerror(errno));
2865 // Resize the output file.
2868 Output_file::resize(off_t file_size)
2870 // If the mmap is mapping an anonymous memory buffer, this is easy:
2871 // just mremap to the new size. If it's mapping to a file, we want
2872 // to unmap to flush to the file, then remap after growing the file.
2873 if (this->map_is_anonymous_)
2875 void* base = ::mremap(this->base_, this->file_size_, file_size,
2877 if (base == MAP_FAILED)
2878 gold_fatal(_("%s: mremap: %s"), this->name_, strerror(errno));
2879 this->base_ = static_cast<unsigned char*>(base);
2880 this->file_size_ = file_size;
2885 this->file_size_ = file_size;
2890 // Map the file into memory.
2895 const int o = this->o_;
2897 // If the output file is not a regular file, don't try to mmap it;
2898 // instead, we'll mmap a block of memory (an anonymous buffer), and
2899 // then later write the buffer to the file.
2901 struct stat statbuf;
2902 if (o == STDOUT_FILENO || o == STDERR_FILENO
2903 || ::fstat(o, &statbuf) != 0
2904 || !S_ISREG(statbuf.st_mode)
2905 || this->is_temporary_)
2907 this->map_is_anonymous_ = true;
2908 base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
2909 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
2913 // Write out one byte to make the file the right size.
2914 if (::lseek(o, this->file_size_ - 1, SEEK_SET) < 0)
2915 gold_fatal(_("%s: lseek: %s"), this->name_, strerror(errno));
2917 if (::write(o, &b, 1) != 1)
2918 gold_fatal(_("%s: write: %s"), this->name_, strerror(errno));
2920 // Map the file into memory.
2921 this->map_is_anonymous_ = false;
2922 base = ::mmap(NULL, this->file_size_, PROT_READ | PROT_WRITE,
2925 if (base == MAP_FAILED)
2926 gold_fatal(_("%s: mmap: %s"), this->name_, strerror(errno));
2927 this->base_ = static_cast<unsigned char*>(base);
2930 // Unmap the file from memory.
2933 Output_file::unmap()
2935 if (::munmap(this->base_, this->file_size_) < 0)
2936 gold_error(_("%s: munmap: %s"), this->name_, strerror(errno));
2940 // Close the output file.
2943 Output_file::close()
2945 // If the map isn't file-backed, we need to write it now.
2946 if (this->map_is_anonymous_ && !this->is_temporary_)
2948 size_t bytes_to_write = this->file_size_;
2949 while (bytes_to_write > 0)
2951 ssize_t bytes_written = ::write(this->o_, this->base_, bytes_to_write);
2952 if (bytes_written == 0)
2953 gold_error(_("%s: write: unexpected 0 return-value"), this->name_);
2954 else if (bytes_written < 0)
2955 gold_error(_("%s: write: %s"), this->name_, strerror(errno));
2957 bytes_to_write -= bytes_written;
2962 // We don't close stdout or stderr
2963 if (this->o_ != STDOUT_FILENO
2964 && this->o_ != STDERR_FILENO
2965 && !this->is_temporary_)
2966 if (::close(this->o_) < 0)
2967 gold_error(_("%s: close: %s"), this->name_, strerror(errno));
2971 // Instantiate the templates we need. We could use the configure
2972 // script to restrict this to only the ones for implemented targets.
2974 #ifdef HAVE_TARGET_32_LITTLE
2977 Output_section::add_input_section<32, false>(
2978 Sized_relobj<32, false>* object,
2980 const char* secname,
2981 const elfcpp::Shdr<32, false>& shdr,
2982 unsigned int reloc_shndx,
2983 bool have_sections_script);
2986 #ifdef HAVE_TARGET_32_BIG
2989 Output_section::add_input_section<32, true>(
2990 Sized_relobj<32, true>* object,
2992 const char* secname,
2993 const elfcpp::Shdr<32, true>& shdr,
2994 unsigned int reloc_shndx,
2995 bool have_sections_script);
2998 #ifdef HAVE_TARGET_64_LITTLE
3001 Output_section::add_input_section<64, false>(
3002 Sized_relobj<64, false>* object,
3004 const char* secname,
3005 const elfcpp::Shdr<64, false>& shdr,
3006 unsigned int reloc_shndx,
3007 bool have_sections_script);
3010 #ifdef HAVE_TARGET_64_BIG
3013 Output_section::add_input_section<64, true>(
3014 Sized_relobj<64, true>* object,
3016 const char* secname,
3017 const elfcpp::Shdr<64, true>& shdr,
3018 unsigned int reloc_shndx,
3019 bool have_sections_script);
3022 #ifdef HAVE_TARGET_32_LITTLE
3024 class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
3027 #ifdef HAVE_TARGET_32_BIG
3029 class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
3032 #ifdef HAVE_TARGET_64_LITTLE
3034 class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
3037 #ifdef HAVE_TARGET_64_BIG
3039 class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
3042 #ifdef HAVE_TARGET_32_LITTLE
3044 class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
3047 #ifdef HAVE_TARGET_32_BIG
3049 class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
3052 #ifdef HAVE_TARGET_64_LITTLE
3054 class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
3057 #ifdef HAVE_TARGET_64_BIG
3059 class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
3062 #ifdef HAVE_TARGET_32_LITTLE
3064 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
3067 #ifdef HAVE_TARGET_32_BIG
3069 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
3072 #ifdef HAVE_TARGET_64_LITTLE
3074 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
3077 #ifdef HAVE_TARGET_64_BIG
3079 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
3082 #ifdef HAVE_TARGET_32_LITTLE
3084 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
3087 #ifdef HAVE_TARGET_32_BIG
3089 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
3092 #ifdef HAVE_TARGET_64_LITTLE
3094 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
3097 #ifdef HAVE_TARGET_64_BIG
3099 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
3102 #ifdef HAVE_TARGET_32_LITTLE
3104 class Output_relocatable_relocs<elfcpp::SHT_REL, 32, false>;
3107 #ifdef HAVE_TARGET_32_BIG
3109 class Output_relocatable_relocs<elfcpp::SHT_REL, 32, true>;
3112 #ifdef HAVE_TARGET_64_LITTLE
3114 class Output_relocatable_relocs<elfcpp::SHT_REL, 64, false>;
3117 #ifdef HAVE_TARGET_64_BIG
3119 class Output_relocatable_relocs<elfcpp::SHT_REL, 64, true>;
3122 #ifdef HAVE_TARGET_32_LITTLE
3124 class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, false>;
3127 #ifdef HAVE_TARGET_32_BIG
3129 class Output_relocatable_relocs<elfcpp::SHT_RELA, 32, true>;
3132 #ifdef HAVE_TARGET_64_LITTLE
3134 class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, false>;
3137 #ifdef HAVE_TARGET_64_BIG
3139 class Output_relocatable_relocs<elfcpp::SHT_RELA, 64, true>;
3142 #ifdef HAVE_TARGET_32_LITTLE
3144 class Output_data_group<32, false>;
3147 #ifdef HAVE_TARGET_32_BIG
3149 class Output_data_group<32, true>;
3152 #ifdef HAVE_TARGET_64_LITTLE
3154 class Output_data_group<64, false>;
3157 #ifdef HAVE_TARGET_64_BIG
3159 class Output_data_group<64, true>;
3162 #ifdef HAVE_TARGET_32_LITTLE
3164 class Output_data_got<32, false>;
3167 #ifdef HAVE_TARGET_32_BIG
3169 class Output_data_got<32, true>;
3172 #ifdef HAVE_TARGET_64_LITTLE
3174 class Output_data_got<64, false>;
3177 #ifdef HAVE_TARGET_64_BIG
3179 class Output_data_got<64, true>;
3182 } // End namespace gold.