1 // output.cc -- manage the output file for gold
21 // Output_data variables.
23 bool Output_data::sizes_are_fixed;
25 // Output_data methods.
27 Output_data::~Output_data()
31 // Set the address and offset.
34 Output_data::set_address(uint64_t addr, off_t off)
36 this->address_ = addr;
39 // Let the child class know.
40 this->do_set_address(addr, off);
43 // Return the default alignment for a size--32 or 64.
46 Output_data::default_alignment(int size)
56 // Output_section_header methods. This currently assumes that the
57 // segment and section lists are complete at construction time.
59 Output_section_headers::Output_section_headers(
63 const Layout::Segment_list* segment_list,
64 const Layout::Section_list* unattached_section_list,
65 const Stringpool* secnamepool)
67 big_endian_(big_endian),
69 segment_list_(segment_list),
70 unattached_section_list_(unattached_section_list),
71 secnamepool_(secnamepool)
73 // Count all the sections. Start with 1 for the null section.
75 for (Layout::Segment_list::const_iterator p = segment_list->begin();
76 p != segment_list->end();
78 if ((*p)->type() == elfcpp::PT_LOAD)
79 count += (*p)->output_section_count();
80 count += unattached_section_list->size();
84 shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
86 shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
90 this->set_data_size(count * shdr_size);
93 // Write out the section headers.
96 Output_section_headers::do_write(Output_file* of)
98 if (this->size_ == 32)
100 if (this->big_endian_)
101 this->do_sized_write<32, true>(of);
103 this->do_sized_write<32, false>(of);
105 else if (this->size_ == 64)
107 if (this->big_endian_)
108 this->do_sized_write<64, true>(of);
110 this->do_sized_write<64, false>(of);
116 template<int size, bool big_endian>
118 Output_section_headers::do_sized_write(Output_file* of)
120 off_t all_shdrs_size = this->data_size();
121 unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
123 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
124 unsigned char* v = view;
127 typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
128 oshdr.put_sh_name(0);
129 oshdr.put_sh_type(elfcpp::SHT_NULL);
130 oshdr.put_sh_flags(0);
131 oshdr.put_sh_addr(0);
132 oshdr.put_sh_offset(0);
133 oshdr.put_sh_size(0);
134 oshdr.put_sh_link(0);
135 oshdr.put_sh_info(0);
136 oshdr.put_sh_addralign(0);
137 oshdr.put_sh_entsize(0);
143 for (Layout::Segment_list::const_iterator p = this->segment_list_->begin();
144 p != this->segment_list_->end();
146 v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
147 this->layout_, this->secnamepool_, v, &shndx
148 SELECT_SIZE_ENDIAN(size, big_endian));
149 for (Layout::Section_list::const_iterator p =
150 this->unattached_section_list_->begin();
151 p != this->unattached_section_list_->end();
154 gold_assert(shndx == (*p)->out_shndx());
155 elfcpp::Shdr_write<size, big_endian> oshdr(v);
156 (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
161 of->write_output_view(this->offset(), all_shdrs_size, view);
164 // Output_segment_header methods.
166 Output_segment_headers::Output_segment_headers(
169 const Layout::Segment_list& segment_list)
170 : size_(size), big_endian_(big_endian), segment_list_(segment_list)
174 phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
176 phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
180 this->set_data_size(segment_list.size() * phdr_size);
184 Output_segment_headers::do_write(Output_file* of)
186 if (this->size_ == 32)
188 if (this->big_endian_)
189 this->do_sized_write<32, true>(of);
191 this->do_sized_write<32, false>(of);
193 else if (this->size_ == 64)
195 if (this->big_endian_)
196 this->do_sized_write<64, true>(of);
198 this->do_sized_write<64, false>(of);
204 template<int size, bool big_endian>
206 Output_segment_headers::do_sized_write(Output_file* of)
208 const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
209 off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
210 unsigned char* view = of->get_output_view(this->offset(),
212 unsigned char* v = view;
213 for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
214 p != this->segment_list_.end();
217 elfcpp::Phdr_write<size, big_endian> ophdr(v);
218 (*p)->write_header(&ophdr);
222 of->write_output_view(this->offset(), all_phdrs_size, view);
225 // Output_file_header methods.
227 Output_file_header::Output_file_header(int size,
229 const General_options& options,
230 const Target* target,
231 const Symbol_table* symtab,
232 const Output_segment_headers* osh)
234 big_endian_(big_endian),
238 segment_header_(osh),
239 section_header_(NULL),
244 ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
246 ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
250 this->set_data_size(ehdr_size);
253 // Set the section table information for a file header.
256 Output_file_header::set_section_info(const Output_section_headers* shdrs,
257 const Output_section* shstrtab)
259 this->section_header_ = shdrs;
260 this->shstrtab_ = shstrtab;
263 // Write out the file header.
266 Output_file_header::do_write(Output_file* of)
268 if (this->size_ == 32)
270 if (this->big_endian_)
271 this->do_sized_write<32, true>(of);
273 this->do_sized_write<32, false>(of);
275 else if (this->size_ == 64)
277 if (this->big_endian_)
278 this->do_sized_write<64, true>(of);
280 this->do_sized_write<64, false>(of);
286 // Write out the file header with appropriate size and endianess.
288 template<int size, bool big_endian>
290 Output_file_header::do_sized_write(Output_file* of)
292 gold_assert(this->offset() == 0);
294 int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
295 unsigned char* view = of->get_output_view(0, ehdr_size);
296 elfcpp::Ehdr_write<size, big_endian> oehdr(view);
298 unsigned char e_ident[elfcpp::EI_NIDENT];
299 memset(e_ident, 0, elfcpp::EI_NIDENT);
300 e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
301 e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
302 e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
303 e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
305 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
307 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
310 e_ident[elfcpp::EI_DATA] = (big_endian
311 ? elfcpp::ELFDATA2MSB
312 : elfcpp::ELFDATA2LSB);
313 e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
314 // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
315 oehdr.put_e_ident(e_ident);
319 if (this->options_.is_relocatable())
320 e_type = elfcpp::ET_REL;
322 e_type = elfcpp::ET_EXEC;
323 oehdr.put_e_type(e_type);
325 oehdr.put_e_machine(this->target_->machine_code());
326 oehdr.put_e_version(elfcpp::EV_CURRENT);
328 // FIXME: Need to support -e, and target specific entry symbol.
329 Symbol* sym = this->symtab_->lookup("_start");
330 typename Sized_symbol<size>::Value_type v;
335 Sized_symbol<size>* ssym;
336 ssym = this->symtab_->get_sized_symbol SELECT_SIZE_NAME(size) (
337 sym SELECT_SIZE(size));
340 oehdr.put_e_entry(v);
342 oehdr.put_e_phoff(this->segment_header_->offset());
343 oehdr.put_e_shoff(this->section_header_->offset());
345 // FIXME: The target needs to set the flags.
346 oehdr.put_e_flags(0);
348 oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
349 oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
350 oehdr.put_e_phnum(this->segment_header_->data_size()
351 / elfcpp::Elf_sizes<size>::phdr_size);
352 oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
353 oehdr.put_e_shnum(this->section_header_->data_size()
354 / elfcpp::Elf_sizes<size>::shdr_size);
355 oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
357 of->write_output_view(0, ehdr_size, view);
360 // Output_data_const methods.
363 Output_data_const::do_write(Output_file* of)
365 of->write(this->offset(), this->data_.data(), this->data_.size());
368 // Output_data_const_buffer methods.
371 Output_data_const_buffer::do_write(Output_file* of)
373 of->write(this->offset(), this->p_, this->data_size());
376 // Output_section_data methods.
378 // Record the output section, and set the entry size and such.
381 Output_section_data::set_output_section(Output_section* os)
383 gold_assert(this->output_section_ == NULL);
384 this->output_section_ = os;
385 this->do_adjust_output_section(os);
388 // Return the section index of the output section.
391 Output_section_data::do_out_shndx() const
393 gold_assert(this->output_section_ != NULL);
394 return this->output_section_->out_shndx();
397 // Output_data_strtab methods.
399 // Set the address. We don't actually care about the address, but we
400 // do set our final size.
403 Output_data_strtab::do_set_address(uint64_t, off_t)
405 this->strtab_->set_string_offsets();
406 this->set_data_size(this->strtab_->get_strtab_size());
409 // Write out a string table.
412 Output_data_strtab::do_write(Output_file* of)
414 this->strtab_->write(of, this->offset());
417 // Output_reloc methods.
419 // Get the symbol index of a relocation.
421 template<bool dynamic, int size, bool big_endian>
423 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index()
427 switch (this->local_sym_index_)
433 if (this->u1_.gsym == NULL)
436 index = this->u1_.gsym->dynsym_index();
438 index = this->u1_.gsym->symtab_index();
443 index = this->u1_.os->dynsym_index();
445 index = this->u1_.os->symtab_index();
451 // FIXME: It seems that some targets may need to generate
452 // dynamic relocations against local symbols for some
453 // reasons. This will have to be addressed at some point.
457 index = this->u1_.relobj->symtab_index(this->local_sym_index_);
460 gold_assert(index != -1U);
464 // Write out the offset and info fields of a Rel or Rela relocation
467 template<bool dynamic, int size, bool big_endian>
468 template<typename Write_rel>
470 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
473 Address address = this->address_;
474 if (this->shndx_ != INVALID_CODE)
477 Output_section* os = this->u2_.relobj->output_section(this->shndx_,
479 gold_assert(os != NULL);
480 address += os->address() + off;
482 else if (this->u2_.od != NULL)
483 address += this->u2_.od->address();
484 wr->put_r_offset(address);
485 wr->put_r_info(elfcpp::elf_r_info<size>(this->get_symbol_index(),
489 // Write out a Rel relocation.
491 template<bool dynamic, int size, bool big_endian>
493 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write(
494 unsigned char* pov) const
496 elfcpp::Rel_write<size, big_endian> orel(pov);
497 this->write_rel(&orel);
500 // Write out a Rela relocation.
502 template<bool dynamic, int size, bool big_endian>
504 Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write(
505 unsigned char* pov) const
507 elfcpp::Rela_write<size, big_endian> orel(pov);
508 this->rel_.write_rel(&orel);
509 orel.put_r_addend(this->addend_);
512 // Output_data_reloc_base methods.
514 // Adjust the output section.
516 template<int sh_type, bool dynamic, int size, bool big_endian>
518 Output_data_reloc_base<sh_type, dynamic, size, big_endian>
519 ::do_adjust_output_section(Output_section* os)
521 if (sh_type == elfcpp::SHT_REL)
522 os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
523 else if (sh_type == elfcpp::SHT_RELA)
524 os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
528 os->set_should_link_to_dynsym();
530 os->set_should_link_to_symtab();
533 // Write out relocation data.
535 template<int sh_type, bool dynamic, int size, bool big_endian>
537 Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write(
540 const off_t off = this->offset();
541 const off_t oview_size = this->data_size();
542 unsigned char* const oview = of->get_output_view(off, oview_size);
544 unsigned char* pov = oview;
545 for (typename Relocs::const_iterator p = this->relocs_.begin();
546 p != this->relocs_.end();
553 gold_assert(pov - oview == oview_size);
555 of->write_output_view(off, oview_size, oview);
557 // We no longer need the relocation entries.
558 this->relocs_.clear();
561 // Output_data_got::Got_entry methods.
563 // Write out the entry.
565 template<int size, bool big_endian>
567 Output_data_got<size, big_endian>::Got_entry::write(
568 const General_options* options,
569 unsigned char* pov) const
573 switch (this->local_sym_index_)
577 Symbol* gsym = this->u_.gsym;
579 // If the symbol is resolved locally, we need to write out its
580 // value. Otherwise we just write zero. The target code is
581 // responsible for creating a relocation entry to fill in the
583 if (gsym->final_value_is_known(options))
585 Sized_symbol<size>* sgsym;
586 // This cast is a bit ugly. We don't want to put a
587 // virtual method in Symbol, because we want Symbol to be
588 // as small as possible.
589 sgsym = static_cast<Sized_symbol<size>*>(gsym);
590 val = sgsym->value();
596 val = this->u_.constant;
603 elfcpp::Swap<size, big_endian>::writeval(pov, val);
606 // Output_data_got methods.
608 // Add an entry for a global symbol to the GOT. This returns true if
609 // this is a new GOT entry, false if the symbol already had a GOT
612 template<int size, bool big_endian>
614 Output_data_got<size, big_endian>::add_global(Symbol* gsym)
616 if (gsym->has_got_offset())
619 this->entries_.push_back(Got_entry(gsym));
620 this->set_got_size();
621 gsym->set_got_offset(this->last_got_offset());
625 // Write out the GOT.
627 template<int size, bool big_endian>
629 Output_data_got<size, big_endian>::do_write(Output_file* of)
631 const int add = size / 8;
633 const off_t off = this->offset();
634 const off_t oview_size = this->data_size();
635 unsigned char* const oview = of->get_output_view(off, oview_size);
637 unsigned char* pov = oview;
638 for (typename Got_entries::const_iterator p = this->entries_.begin();
639 p != this->entries_.end();
642 p->write(this->options_, pov);
646 gold_assert(pov - oview == oview_size);
648 of->write_output_view(off, oview_size, oview);
650 // We no longer need the GOT entries.
651 this->entries_.clear();
654 // Output_data_dynamic::Dynamic_entry methods.
656 // Write out the entry.
658 template<int size, bool big_endian>
660 Output_data_dynamic::Dynamic_entry::write(
662 const Stringpool* pool
663 ACCEPT_SIZE_ENDIAN) const
665 typename elfcpp::Elf_types<size>::Elf_WXword val;
666 switch (this->classification_)
672 case DYNAMIC_SECTION_ADDRESS:
673 val = this->u_.od->address();
676 case DYNAMIC_SECTION_SIZE:
677 val = this->u_.od->data_size();
682 const Sized_symbol<size>* s =
683 static_cast<const Sized_symbol<size>*>(this->u_.sym);
689 val = pool->get_offset(this->u_.str);
696 elfcpp::Dyn_write<size, big_endian> dw(pov);
697 dw.put_d_tag(this->tag_);
701 // Output_data_dynamic methods.
703 // Adjust the output section to set the entry size.
706 Output_data_dynamic::do_adjust_output_section(Output_section* os)
708 if (this->target_->get_size() == 32)
709 os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
710 else if (this->target_->get_size() == 64)
711 os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
716 // Set the final data size.
719 Output_data_dynamic::do_set_address(uint64_t, off_t)
721 // Add the terminating entry.
722 this->add_constant(elfcpp::DT_NULL, 0);
725 if (this->target_->get_size() == 32)
726 dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
727 else if (this->target_->get_size() == 64)
728 dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
731 this->set_data_size(this->entries_.size() * dyn_size);
734 // Write out the dynamic entries.
737 Output_data_dynamic::do_write(Output_file* of)
739 if (this->target_->get_size() == 32)
741 if (this->target_->is_big_endian())
742 this->sized_write<32, true>(of);
744 this->sized_write<32, false>(of);
746 else if (this->target_->get_size() == 64)
748 if (this->target_->is_big_endian())
749 this->sized_write<64, true>(of);
751 this->sized_write<64, false>(of);
757 template<int size, bool big_endian>
759 Output_data_dynamic::sized_write(Output_file* of)
761 const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
763 const off_t offset = this->offset();
764 const off_t oview_size = this->data_size();
765 unsigned char* const oview = of->get_output_view(offset, oview_size);
767 unsigned char* pov = oview;
768 for (typename Dynamic_entries::const_iterator p = this->entries_.begin();
769 p != this->entries_.end();
772 p->write SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
773 pov, this->pool_ SELECT_SIZE_ENDIAN(size, big_endian));
777 gold_assert(pov - oview == oview_size);
779 of->write_output_view(offset, oview_size, oview);
781 // We no longer need the dynamic entries.
782 this->entries_.clear();
785 // Output_section::Input_section methods.
787 // Return the data size. For an input section we store the size here.
788 // For an Output_section_data, we have to ask it for the size.
791 Output_section::Input_section::data_size() const
793 if (this->is_input_section())
794 return this->u1_.data_size;
796 return this->u2_.posd->data_size();
799 // Set the address and file offset.
802 Output_section::Input_section::set_address(uint64_t addr, off_t off,
805 if (this->is_input_section())
806 this->u2_.object->set_section_offset(this->shndx_, off - secoff);
808 this->u2_.posd->set_address(addr, off);
811 // Try to turn an input address into an output address.
814 Output_section::Input_section::output_address(const Relobj* object,
817 uint64_t output_section_address,
818 uint64_t *poutput) const
820 if (!this->is_input_section())
821 return this->u2_.posd->output_address(object, shndx, offset,
822 output_section_address, poutput);
825 if (this->u2_.object != object)
828 Output_section* os = object->output_section(shndx, &output_offset);
829 gold_assert(os != NULL);
830 *poutput = output_section_address + output_offset + offset;
835 // Write out the data. We don't have to do anything for an input
836 // section--they are handled via Object::relocate--but this is where
837 // we write out the data for an Output_section_data.
840 Output_section::Input_section::write(Output_file* of)
842 if (!this->is_input_section())
843 this->u2_.posd->write(of);
846 // Output_section methods.
848 // Construct an Output_section. NAME will point into a Stringpool.
850 Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
851 elfcpp::Elf_Xword flags)
865 first_input_offset_(0),
866 needs_symtab_index_(false),
867 needs_dynsym_index_(false),
868 should_link_to_symtab_(false),
869 should_link_to_dynsym_(false)
873 Output_section::~Output_section()
877 // Set the entry size.
880 Output_section::set_entsize(uint64_t v)
882 if (this->entsize_ == 0)
885 gold_assert(this->entsize_ == v);
888 // Add the input section SHNDX, with header SHDR, named SECNAME, in
889 // OBJECT, to the Output_section. Return the offset of the input
890 // section within the output section. We don't always keep track of
891 // input sections for an Output_section. Instead, each Object keeps
892 // track of the Output_section for each of its input sections.
894 template<int size, bool big_endian>
896 Output_section::add_input_section(Relobj* object, unsigned int shndx,
898 const elfcpp::Shdr<size, big_endian>& shdr)
900 elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
901 if ((addralign & (addralign - 1)) != 0)
903 fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"),
904 program_name, object->name().c_str(),
905 static_cast<unsigned long>(addralign), secname);
909 if (addralign > this->addralign_)
910 this->addralign_ = addralign;
912 // If this is a SHF_MERGE section, we pass all the input sections to
913 // a Output_data_merge.
914 if ((shdr.get_sh_flags() & elfcpp::SHF_MERGE) != 0)
916 if (this->add_merge_input_section(object, shndx, shdr.get_sh_flags(),
917 shdr.get_sh_entsize(),
920 // Tell the relocation routines that they need to call the
921 // output_address method to determine the final address.
926 off_t ssize = this->data_size();
927 ssize = align_address(ssize, addralign);
928 this->set_data_size(ssize + shdr.get_sh_size());
930 // We need to keep track of this section if we are already keeping
931 // track of sections, or if we are relaxing. FIXME: Add test for
933 if (! this->input_sections_.empty())
934 this->input_sections_.push_back(Input_section(object, shndx,
941 // Add arbitrary data to an output section.
944 Output_section::add_output_section_data(Output_section_data* posd)
946 Input_section inp(posd);
947 this->add_output_section_data(&inp);
950 // Add arbitrary data to an output section by Input_section.
953 Output_section::add_output_section_data(Input_section* inp)
955 if (this->input_sections_.empty())
956 this->first_input_offset_ = this->data_size();
958 this->input_sections_.push_back(*inp);
960 uint64_t addralign = inp->addralign();
961 if (addralign > this->addralign_)
962 this->addralign_ = addralign;
964 inp->set_output_section(this);
967 // Add a merge section to an output section.
970 Output_section::add_output_merge_section(Output_section_data* posd,
971 bool is_string, uint64_t entsize)
973 Input_section inp(posd, is_string, entsize);
974 this->add_output_section_data(&inp);
977 // Add an input section to a SHF_MERGE section.
980 Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
981 uint64_t flags, uint64_t entsize,
984 // We only merge constants if the alignment is not more than the
985 // entry size. This could be handled, but it's unusual.
986 if (addralign > entsize)
989 bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
990 Input_section_list::iterator p;
991 for (p = this->input_sections_.begin();
992 p != this->input_sections_.end();
994 if (p->is_merge_section(is_string, entsize))
997 // We handle the actual constant merging in Output_merge_data or
998 // Output_merge_string_data.
999 if (p != this->input_sections_.end())
1000 p->add_input_section(object, shndx);
1003 Output_section_data* posd;
1005 posd = new Output_merge_data(entsize);
1006 else if (entsize == 1)
1007 posd = new Output_merge_string<char>();
1008 else if (entsize == 2)
1009 posd = new Output_merge_string<uint16_t>();
1010 else if (entsize == 4)
1011 posd = new Output_merge_string<uint32_t>();
1015 this->add_output_merge_section(posd, is_string, entsize);
1016 posd->add_input_section(object, shndx);
1022 // Return the output virtual address of OFFSET relative to the start
1023 // of input section SHNDX in object OBJECT.
1026 Output_section::output_address(const Relobj* object, unsigned int shndx,
1029 uint64_t addr = this->address() + this->first_input_offset_;
1030 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1031 p != this->input_sections_.end();
1034 addr = align_address(addr, p->addralign());
1036 if (p->output_address(object, shndx, offset, addr, &output))
1038 addr += p->data_size();
1041 // If we get here, it means that we don't know the mapping for this
1042 // input section. This might happen in principle if
1043 // add_input_section were called before add_output_section_data.
1044 // But it should never actually happen.
1049 // Set the address of an Output_section. This is where we handle
1050 // setting the addresses of any Output_section_data objects.
1053 Output_section::do_set_address(uint64_t address, off_t startoff)
1055 if (this->input_sections_.empty())
1058 off_t off = startoff + this->first_input_offset_;
1059 for (Input_section_list::iterator p = this->input_sections_.begin();
1060 p != this->input_sections_.end();
1063 off = align_address(off, p->addralign());
1064 p->set_address(address + (off - startoff), off, startoff);
1065 off += p->data_size();
1068 this->set_data_size(off - startoff);
1071 // Write the section header to *OSHDR.
1073 template<int size, bool big_endian>
1075 Output_section::write_header(const Layout* layout,
1076 const Stringpool* secnamepool,
1077 elfcpp::Shdr_write<size, big_endian>* oshdr) const
1079 oshdr->put_sh_name(secnamepool->get_offset(this->name_));
1080 oshdr->put_sh_type(this->type_);
1081 oshdr->put_sh_flags(this->flags_);
1082 oshdr->put_sh_addr(this->address());
1083 oshdr->put_sh_offset(this->offset());
1084 oshdr->put_sh_size(this->data_size());
1085 if (this->link_section_ != NULL)
1086 oshdr->put_sh_link(this->link_section_->out_shndx());
1087 else if (this->should_link_to_symtab_)
1088 oshdr->put_sh_link(layout->symtab_section()->out_shndx());
1089 else if (this->should_link_to_dynsym_)
1090 oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
1092 oshdr->put_sh_link(this->link_);
1093 if (this->info_section_ != NULL)
1094 oshdr->put_sh_info(this->info_section_->out_shndx());
1096 oshdr->put_sh_info(this->info_);
1097 oshdr->put_sh_addralign(this->addralign_);
1098 oshdr->put_sh_entsize(this->entsize_);
1101 // Write out the data. For input sections the data is written out by
1102 // Object::relocate, but we have to handle Output_section_data objects
1106 Output_section::do_write(Output_file* of)
1108 for (Input_section_list::iterator p = this->input_sections_.begin();
1109 p != this->input_sections_.end();
1114 // Output segment methods.
1116 Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
1127 is_align_known_(false)
1131 // Add an Output_section to an Output_segment.
1134 Output_segment::add_output_section(Output_section* os,
1135 elfcpp::Elf_Word seg_flags,
1138 gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
1139 gold_assert(!this->is_align_known_);
1141 // Update the segment flags.
1142 this->flags_ |= seg_flags;
1144 Output_segment::Output_data_list* pdl;
1145 if (os->type() == elfcpp::SHT_NOBITS)
1146 pdl = &this->output_bss_;
1148 pdl = &this->output_data_;
1150 // So that PT_NOTE segments will work correctly, we need to ensure
1151 // that all SHT_NOTE sections are adjacent. This will normally
1152 // happen automatically, because all the SHT_NOTE input sections
1153 // will wind up in the same output section. However, it is possible
1154 // for multiple SHT_NOTE input sections to have different section
1155 // flags, and thus be in different output sections, but for the
1156 // different section flags to map into the same segment flags and
1157 // thus the same output segment.
1159 // Note that while there may be many input sections in an output
1160 // section, there are normally only a few output sections in an
1161 // output segment. This loop is expected to be fast.
1163 if (os->type() == elfcpp::SHT_NOTE && !pdl->empty())
1165 Output_segment::Output_data_list::iterator p = pdl->end();
1169 if ((*p)->is_section_type(elfcpp::SHT_NOTE))
1171 // We don't worry about the FRONT parameter.
1177 while (p != pdl->begin());
1180 // Similarly, so that PT_TLS segments will work, we need to group
1181 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
1182 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
1183 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
1185 if ((os->flags() & elfcpp::SHF_TLS) != 0 && !this->output_data_.empty())
1187 pdl = &this->output_data_;
1188 bool nobits = os->type() == elfcpp::SHT_NOBITS;
1189 bool sawtls = false;
1190 Output_segment::Output_data_list::iterator p = pdl->end();
1195 if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
1198 // Put a NOBITS section after the first TLS section.
1199 // But a PROGBITS section after the first TLS/PROGBITS
1201 insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
1205 // If we've gone past the TLS sections, but we've seen a
1206 // TLS section, then we need to insert this section now.
1212 // We don't worry about the FRONT parameter.
1218 while (p != pdl->begin());
1220 // There are no TLS sections yet; put this one at the requested
1221 // location in the section list.
1225 pdl->push_front(os);
1230 // Add an Output_data (which is not an Output_section) to the start of
1234 Output_segment::add_initial_output_data(Output_data* od)
1236 gold_assert(!this->is_align_known_);
1237 this->output_data_.push_front(od);
1240 // Return the maximum alignment of the Output_data in Output_segment.
1241 // Once we compute this, we prohibit new sections from being added.
1244 Output_segment::addralign()
1246 if (!this->is_align_known_)
1250 addralign = Output_segment::maximum_alignment(&this->output_data_);
1251 if (addralign > this->align_)
1252 this->align_ = addralign;
1254 addralign = Output_segment::maximum_alignment(&this->output_bss_);
1255 if (addralign > this->align_)
1256 this->align_ = addralign;
1258 this->is_align_known_ = true;
1261 return this->align_;
1264 // Return the maximum alignment of a list of Output_data.
1267 Output_segment::maximum_alignment(const Output_data_list* pdl)
1270 for (Output_data_list::const_iterator p = pdl->begin();
1274 uint64_t addralign = (*p)->addralign();
1275 if (addralign > ret)
1281 // Set the section addresses for an Output_segment. ADDR is the
1282 // address and *POFF is the file offset. Set the section indexes
1283 // starting with *PSHNDX. Return the address of the immediately
1284 // following segment. Update *POFF and *PSHNDX.
1287 Output_segment::set_section_addresses(uint64_t addr, off_t* poff,
1288 unsigned int* pshndx)
1290 gold_assert(this->type_ == elfcpp::PT_LOAD);
1292 this->vaddr_ = addr;
1293 this->paddr_ = addr;
1295 off_t orig_off = *poff;
1296 this->offset_ = orig_off;
1298 *poff = align_address(*poff, this->addralign());
1300 addr = this->set_section_list_addresses(&this->output_data_, addr, poff,
1302 this->filesz_ = *poff - orig_off;
1306 uint64_t ret = this->set_section_list_addresses(&this->output_bss_, addr,
1308 this->memsz_ = *poff - orig_off;
1310 // Ignore the file offset adjustments made by the BSS Output_data
1317 // Set the addresses and file offsets in a list of Output_data
1321 Output_segment::set_section_list_addresses(Output_data_list* pdl,
1322 uint64_t addr, off_t* poff,
1323 unsigned int* pshndx)
1325 off_t startoff = *poff;
1327 off_t off = startoff;
1328 for (Output_data_list::iterator p = pdl->begin();
1332 off = align_address(off, (*p)->addralign());
1333 (*p)->set_address(addr + (off - startoff), off);
1335 // Unless this is a PT_TLS segment, we want to ignore the size
1336 // of a SHF_TLS/SHT_NOBITS section. Such a section does not
1337 // affect the size of a PT_LOAD segment.
1338 if (this->type_ == elfcpp::PT_TLS
1339 || !(*p)->is_section_flag_set(elfcpp::SHF_TLS)
1340 || !(*p)->is_section_type(elfcpp::SHT_NOBITS))
1341 off += (*p)->data_size();
1343 if ((*p)->is_section())
1345 (*p)->set_out_shndx(*pshndx);
1351 return addr + (off - startoff);
1354 // For a non-PT_LOAD segment, set the offset from the sections, if
1358 Output_segment::set_offset()
1360 gold_assert(this->type_ != elfcpp::PT_LOAD);
1362 if (this->output_data_.empty() && this->output_bss_.empty())
1373 const Output_data* first;
1374 if (this->output_data_.empty())
1375 first = this->output_bss_.front();
1377 first = this->output_data_.front();
1378 this->vaddr_ = first->address();
1379 this->paddr_ = this->vaddr_;
1380 this->offset_ = first->offset();
1382 if (this->output_data_.empty())
1386 const Output_data* last_data = this->output_data_.back();
1387 this->filesz_ = (last_data->address()
1388 + last_data->data_size()
1392 const Output_data* last;
1393 if (this->output_bss_.empty())
1394 last = this->output_data_.back();
1396 last = this->output_bss_.back();
1397 this->memsz_ = (last->address()
1402 // Return the number of Output_sections in an Output_segment.
1405 Output_segment::output_section_count() const
1407 return (this->output_section_count_list(&this->output_data_)
1408 + this->output_section_count_list(&this->output_bss_));
1411 // Return the number of Output_sections in an Output_data_list.
1414 Output_segment::output_section_count_list(const Output_data_list* pdl) const
1416 unsigned int count = 0;
1417 for (Output_data_list::const_iterator p = pdl->begin();
1421 if ((*p)->is_section())
1427 // Write the segment data into *OPHDR.
1429 template<int size, bool big_endian>
1431 Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr)
1433 ophdr->put_p_type(this->type_);
1434 ophdr->put_p_offset(this->offset_);
1435 ophdr->put_p_vaddr(this->vaddr_);
1436 ophdr->put_p_paddr(this->paddr_);
1437 ophdr->put_p_filesz(this->filesz_);
1438 ophdr->put_p_memsz(this->memsz_);
1439 ophdr->put_p_flags(this->flags_);
1440 ophdr->put_p_align(this->addralign());
1443 // Write the section headers into V.
1445 template<int size, bool big_endian>
1447 Output_segment::write_section_headers(const Layout* layout,
1448 const Stringpool* secnamepool,
1450 unsigned int *pshndx
1451 ACCEPT_SIZE_ENDIAN) const
1453 // Every section that is attached to a segment must be attached to a
1454 // PT_LOAD segment, so we only write out section headers for PT_LOAD
1456 if (this->type_ != elfcpp::PT_LOAD)
1459 v = this->write_section_headers_list
1460 SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
1461 layout, secnamepool, &this->output_data_, v, pshndx
1462 SELECT_SIZE_ENDIAN(size, big_endian));
1463 v = this->write_section_headers_list
1464 SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
1465 layout, secnamepool, &this->output_bss_, v, pshndx
1466 SELECT_SIZE_ENDIAN(size, big_endian));
1470 template<int size, bool big_endian>
1472 Output_segment::write_section_headers_list(const Layout* layout,
1473 const Stringpool* secnamepool,
1474 const Output_data_list* pdl,
1476 unsigned int* pshndx
1477 ACCEPT_SIZE_ENDIAN) const
1479 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
1480 for (Output_data_list::const_iterator p = pdl->begin();
1484 if ((*p)->is_section())
1486 const Output_section* ps = static_cast<const Output_section*>(*p);
1487 gold_assert(*pshndx == ps->out_shndx());
1488 elfcpp::Shdr_write<size, big_endian> oshdr(v);
1489 ps->write_header(layout, secnamepool, &oshdr);
1497 // Output_file methods.
1499 Output_file::Output_file(const General_options& options)
1500 : options_(options),
1501 name_(options.output_file_name()),
1508 // Open the output file.
1511 Output_file::open(off_t file_size)
1513 this->file_size_ = file_size;
1515 int mode = this->options_.is_relocatable() ? 0666 : 0777;
1516 int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
1519 fprintf(stderr, _("%s: %s: open: %s\n"),
1520 program_name, this->name_, strerror(errno));
1525 // Write out one byte to make the file the right size.
1526 if (::lseek(o, file_size - 1, SEEK_SET) < 0)
1528 fprintf(stderr, _("%s: %s: lseek: %s\n"),
1529 program_name, this->name_, strerror(errno));
1533 if (::write(o, &b, 1) != 1)
1535 fprintf(stderr, _("%s: %s: write: %s\n"),
1536 program_name, this->name_, strerror(errno));
1540 // Map the file into memory.
1541 void* base = ::mmap(NULL, file_size, PROT_READ | PROT_WRITE,
1543 if (base == MAP_FAILED)
1545 fprintf(stderr, _("%s: %s: mmap: %s\n"),
1546 program_name, this->name_, strerror(errno));
1549 this->base_ = static_cast<unsigned char*>(base);
1552 // Close the output file.
1555 Output_file::close()
1557 if (::munmap(this->base_, this->file_size_) < 0)
1559 fprintf(stderr, _("%s: %s: munmap: %s\n"),
1560 program_name, this->name_, strerror(errno));
1565 if (::close(this->o_) < 0)
1567 fprintf(stderr, _("%s: %s: close: %s\n"),
1568 program_name, this->name_, strerror(errno));
1574 // Instantiate the templates we need. We could use the configure
1575 // script to restrict this to only the ones for implemented targets.
1577 #ifdef HAVE_TARGET_32_LITTLE
1580 Output_section::add_input_section<32, false>(
1583 const char* secname,
1584 const elfcpp::Shdr<32, false>& shdr);
1587 #ifdef HAVE_TARGET_32_BIG
1590 Output_section::add_input_section<32, true>(
1593 const char* secname,
1594 const elfcpp::Shdr<32, true>& shdr);
1597 #ifdef HAVE_TARGET_64_LITTLE
1600 Output_section::add_input_section<64, false>(
1603 const char* secname,
1604 const elfcpp::Shdr<64, false>& shdr);
1607 #ifdef HAVE_TARGET_64_BIG
1610 Output_section::add_input_section<64, true>(
1613 const char* secname,
1614 const elfcpp::Shdr<64, true>& shdr);
1617 #ifdef HAVE_TARGET_32_LITTLE
1619 class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
1622 #ifdef HAVE_TARGET_32_BIG
1624 class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
1627 #ifdef HAVE_TARGET_64_LITTLE
1629 class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
1632 #ifdef HAVE_TARGET_64_BIG
1634 class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
1637 #ifdef HAVE_TARGET_32_LITTLE
1639 class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
1642 #ifdef HAVE_TARGET_32_BIG
1644 class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
1647 #ifdef HAVE_TARGET_64_LITTLE
1649 class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
1652 #ifdef HAVE_TARGET_64_BIG
1654 class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
1657 #ifdef HAVE_TARGET_32_LITTLE
1659 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
1662 #ifdef HAVE_TARGET_32_BIG
1664 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
1667 #ifdef HAVE_TARGET_64_LITTLE
1669 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
1672 #ifdef HAVE_TARGET_64_BIG
1674 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
1677 #ifdef HAVE_TARGET_32_LITTLE
1679 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
1682 #ifdef HAVE_TARGET_32_BIG
1684 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
1687 #ifdef HAVE_TARGET_64_LITTLE
1689 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
1692 #ifdef HAVE_TARGET_64_BIG
1694 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
1697 #ifdef HAVE_TARGET_32_LITTLE
1699 class Output_data_got<32, false>;
1702 #ifdef HAVE_TARGET_32_BIG
1704 class Output_data_got<32, true>;
1707 #ifdef HAVE_TARGET_64_LITTLE
1709 class Output_data_got<64, false>;
1712 #ifdef HAVE_TARGET_64_BIG
1714 class Output_data_got<64, true>;
1717 } // End namespace gold.