1 // output.cc -- manage the output file for gold
12 #include "parameters.h"
22 // Output_data variables.
24 bool Output_data::sizes_are_fixed;
26 // Output_data methods.
28 Output_data::~Output_data()
32 // Set the address and offset.
35 Output_data::set_address(uint64_t addr, off_t off)
37 this->address_ = addr;
40 // Let the child class know.
41 this->do_set_address(addr, off);
44 // Return the default alignment for a size--32 or 64.
47 Output_data::default_alignment(int size)
57 // Output_section_header methods. This currently assumes that the
58 // segment and section lists are complete at construction time.
60 Output_section_headers::Output_section_headers(
64 const Layout::Segment_list* segment_list,
65 const Layout::Section_list* unattached_section_list,
66 const Stringpool* secnamepool)
68 big_endian_(big_endian),
70 segment_list_(segment_list),
71 unattached_section_list_(unattached_section_list),
72 secnamepool_(secnamepool)
74 // Count all the sections. Start with 1 for the null section.
76 for (Layout::Segment_list::const_iterator p = segment_list->begin();
77 p != segment_list->end();
79 if ((*p)->type() == elfcpp::PT_LOAD)
80 count += (*p)->output_section_count();
81 count += unattached_section_list->size();
85 shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
87 shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
91 this->set_data_size(count * shdr_size);
94 // Write out the section headers.
97 Output_section_headers::do_write(Output_file* of)
99 if (this->size_ == 32)
101 if (this->big_endian_)
102 this->do_sized_write<32, true>(of);
104 this->do_sized_write<32, false>(of);
106 else if (this->size_ == 64)
108 if (this->big_endian_)
109 this->do_sized_write<64, true>(of);
111 this->do_sized_write<64, false>(of);
117 template<int size, bool big_endian>
119 Output_section_headers::do_sized_write(Output_file* of)
121 off_t all_shdrs_size = this->data_size();
122 unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
124 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
125 unsigned char* v = view;
128 typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
129 oshdr.put_sh_name(0);
130 oshdr.put_sh_type(elfcpp::SHT_NULL);
131 oshdr.put_sh_flags(0);
132 oshdr.put_sh_addr(0);
133 oshdr.put_sh_offset(0);
134 oshdr.put_sh_size(0);
135 oshdr.put_sh_link(0);
136 oshdr.put_sh_info(0);
137 oshdr.put_sh_addralign(0);
138 oshdr.put_sh_entsize(0);
144 for (Layout::Segment_list::const_iterator p = this->segment_list_->begin();
145 p != this->segment_list_->end();
147 v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
148 this->layout_, this->secnamepool_, v, &shndx
149 SELECT_SIZE_ENDIAN(size, big_endian));
150 for (Layout::Section_list::const_iterator p =
151 this->unattached_section_list_->begin();
152 p != this->unattached_section_list_->end();
155 gold_assert(shndx == (*p)->out_shndx());
156 elfcpp::Shdr_write<size, big_endian> oshdr(v);
157 (*p)->write_header(this->layout_, this->secnamepool_, &oshdr);
162 of->write_output_view(this->offset(), all_shdrs_size, view);
165 // Output_segment_header methods.
167 Output_segment_headers::Output_segment_headers(
170 const Layout::Segment_list& segment_list)
171 : size_(size), big_endian_(big_endian), segment_list_(segment_list)
175 phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
177 phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
181 this->set_data_size(segment_list.size() * phdr_size);
185 Output_segment_headers::do_write(Output_file* of)
187 if (this->size_ == 32)
189 if (this->big_endian_)
190 this->do_sized_write<32, true>(of);
192 this->do_sized_write<32, false>(of);
194 else if (this->size_ == 64)
196 if (this->big_endian_)
197 this->do_sized_write<64, true>(of);
199 this->do_sized_write<64, false>(of);
205 template<int size, bool big_endian>
207 Output_segment_headers::do_sized_write(Output_file* of)
209 const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
210 off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
211 unsigned char* view = of->get_output_view(this->offset(),
213 unsigned char* v = view;
214 for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
215 p != this->segment_list_.end();
218 elfcpp::Phdr_write<size, big_endian> ophdr(v);
219 (*p)->write_header(&ophdr);
223 of->write_output_view(this->offset(), all_phdrs_size, view);
226 // Output_file_header methods.
228 Output_file_header::Output_file_header(int size,
230 const Target* target,
231 const Symbol_table* symtab,
232 const Output_segment_headers* osh)
234 big_endian_(big_endian),
237 segment_header_(osh),
238 section_header_(NULL),
243 ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
245 ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
249 this->set_data_size(ehdr_size);
252 // Set the section table information for a file header.
255 Output_file_header::set_section_info(const Output_section_headers* shdrs,
256 const Output_section* shstrtab)
258 this->section_header_ = shdrs;
259 this->shstrtab_ = shstrtab;
262 // Write out the file header.
265 Output_file_header::do_write(Output_file* of)
267 if (this->size_ == 32)
269 if (this->big_endian_)
270 this->do_sized_write<32, true>(of);
272 this->do_sized_write<32, false>(of);
274 else if (this->size_ == 64)
276 if (this->big_endian_)
277 this->do_sized_write<64, true>(of);
279 this->do_sized_write<64, false>(of);
285 // Write out the file header with appropriate size and endianess.
287 template<int size, bool big_endian>
289 Output_file_header::do_sized_write(Output_file* of)
291 gold_assert(this->offset() == 0);
293 int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
294 unsigned char* view = of->get_output_view(0, ehdr_size);
295 elfcpp::Ehdr_write<size, big_endian> oehdr(view);
297 unsigned char e_ident[elfcpp::EI_NIDENT];
298 memset(e_ident, 0, elfcpp::EI_NIDENT);
299 e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
300 e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
301 e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
302 e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
304 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
306 e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
309 e_ident[elfcpp::EI_DATA] = (big_endian
310 ? elfcpp::ELFDATA2MSB
311 : elfcpp::ELFDATA2LSB);
312 e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
313 // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
314 oehdr.put_e_ident(e_ident);
318 if (parameters->output_is_object())
319 e_type = elfcpp::ET_REL;
321 e_type = elfcpp::ET_EXEC;
322 oehdr.put_e_type(e_type);
324 oehdr.put_e_machine(this->target_->machine_code());
325 oehdr.put_e_version(elfcpp::EV_CURRENT);
327 // FIXME: Need to support -e, and target specific entry symbol.
328 Symbol* sym = this->symtab_->lookup("_start");
329 typename Sized_symbol<size>::Value_type v;
334 Sized_symbol<size>* ssym;
335 ssym = this->symtab_->get_sized_symbol SELECT_SIZE_NAME(size) (
336 sym SELECT_SIZE(size));
339 oehdr.put_e_entry(v);
341 oehdr.put_e_phoff(this->segment_header_->offset());
342 oehdr.put_e_shoff(this->section_header_->offset());
344 // FIXME: The target needs to set the flags.
345 oehdr.put_e_flags(0);
347 oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
348 oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
349 oehdr.put_e_phnum(this->segment_header_->data_size()
350 / elfcpp::Elf_sizes<size>::phdr_size);
351 oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
352 oehdr.put_e_shnum(this->section_header_->data_size()
353 / elfcpp::Elf_sizes<size>::shdr_size);
354 oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
356 of->write_output_view(0, ehdr_size, view);
359 // Output_data_const methods.
362 Output_data_const::do_write(Output_file* of)
364 of->write(this->offset(), this->data_.data(), this->data_.size());
367 // Output_data_const_buffer methods.
370 Output_data_const_buffer::do_write(Output_file* of)
372 of->write(this->offset(), this->p_, this->data_size());
375 // Output_section_data methods.
377 // Record the output section, and set the entry size and such.
380 Output_section_data::set_output_section(Output_section* os)
382 gold_assert(this->output_section_ == NULL);
383 this->output_section_ = os;
384 this->do_adjust_output_section(os);
387 // Return the section index of the output section.
390 Output_section_data::do_out_shndx() const
392 gold_assert(this->output_section_ != NULL);
393 return this->output_section_->out_shndx();
396 // Output_data_strtab methods.
398 // Set the address. We don't actually care about the address, but we
399 // do set our final size.
402 Output_data_strtab::do_set_address(uint64_t, off_t)
404 this->strtab_->set_string_offsets();
405 this->set_data_size(this->strtab_->get_strtab_size());
408 // Write out a string table.
411 Output_data_strtab::do_write(Output_file* of)
413 this->strtab_->write(of, this->offset());
416 // Output_reloc methods.
418 // Get the symbol index of a relocation.
420 template<bool dynamic, int size, bool big_endian>
422 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index()
426 switch (this->local_sym_index_)
432 if (this->u1_.gsym == NULL)
435 index = this->u1_.gsym->dynsym_index();
437 index = this->u1_.gsym->symtab_index();
442 index = this->u1_.os->dynsym_index();
444 index = this->u1_.os->symtab_index();
450 // FIXME: It seems that some targets may need to generate
451 // dynamic relocations against local symbols for some
452 // reasons. This will have to be addressed at some point.
456 index = this->u1_.relobj->symtab_index(this->local_sym_index_);
459 gold_assert(index != -1U);
463 // Write out the offset and info fields of a Rel or Rela relocation
466 template<bool dynamic, int size, bool big_endian>
467 template<typename Write_rel>
469 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel(
472 Address address = this->address_;
473 if (this->shndx_ != INVALID_CODE)
476 Output_section* os = this->u2_.relobj->output_section(this->shndx_,
478 gold_assert(os != NULL);
479 address += os->address() + off;
481 else if (this->u2_.od != NULL)
482 address += this->u2_.od->address();
483 wr->put_r_offset(address);
484 wr->put_r_info(elfcpp::elf_r_info<size>(this->get_symbol_index(),
488 // Write out a Rel relocation.
490 template<bool dynamic, int size, bool big_endian>
492 Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write(
493 unsigned char* pov) const
495 elfcpp::Rel_write<size, big_endian> orel(pov);
496 this->write_rel(&orel);
499 // Write out a Rela relocation.
501 template<bool dynamic, int size, bool big_endian>
503 Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write(
504 unsigned char* pov) const
506 elfcpp::Rela_write<size, big_endian> orel(pov);
507 this->rel_.write_rel(&orel);
508 orel.put_r_addend(this->addend_);
511 // Output_data_reloc_base methods.
513 // Adjust the output section.
515 template<int sh_type, bool dynamic, int size, bool big_endian>
517 Output_data_reloc_base<sh_type, dynamic, size, big_endian>
518 ::do_adjust_output_section(Output_section* os)
520 if (sh_type == elfcpp::SHT_REL)
521 os->set_entsize(elfcpp::Elf_sizes<size>::rel_size);
522 else if (sh_type == elfcpp::SHT_RELA)
523 os->set_entsize(elfcpp::Elf_sizes<size>::rela_size);
527 os->set_should_link_to_dynsym();
529 os->set_should_link_to_symtab();
532 // Write out relocation data.
534 template<int sh_type, bool dynamic, int size, bool big_endian>
536 Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write(
539 const off_t off = this->offset();
540 const off_t oview_size = this->data_size();
541 unsigned char* const oview = of->get_output_view(off, oview_size);
543 unsigned char* pov = oview;
544 for (typename Relocs::const_iterator p = this->relocs_.begin();
545 p != this->relocs_.end();
552 gold_assert(pov - oview == oview_size);
554 of->write_output_view(off, oview_size, oview);
556 // We no longer need the relocation entries.
557 this->relocs_.clear();
560 // Output_data_got::Got_entry methods.
562 // Write out the entry.
564 template<int size, bool big_endian>
566 Output_data_got<size, big_endian>::Got_entry::write(unsigned char* pov) const
570 switch (this->local_sym_index_)
574 Symbol* gsym = this->u_.gsym;
576 // If the symbol is resolved locally, we need to write out its
577 // value. Otherwise we just write zero. The target code is
578 // responsible for creating a relocation entry to fill in the
580 if (gsym->final_value_is_known())
582 Sized_symbol<size>* sgsym;
583 // This cast is a bit ugly. We don't want to put a
584 // virtual method in Symbol, because we want Symbol to be
585 // as small as possible.
586 sgsym = static_cast<Sized_symbol<size>*>(gsym);
587 val = sgsym->value();
593 val = this->u_.constant;
600 elfcpp::Swap<size, big_endian>::writeval(pov, val);
603 // Output_data_got methods.
605 // Add an entry for a global symbol to the GOT. This returns true if
606 // this is a new GOT entry, false if the symbol already had a GOT
609 template<int size, bool big_endian>
611 Output_data_got<size, big_endian>::add_global(Symbol* gsym)
613 if (gsym->has_got_offset())
616 this->entries_.push_back(Got_entry(gsym));
617 this->set_got_size();
618 gsym->set_got_offset(this->last_got_offset());
622 // Write out the GOT.
624 template<int size, bool big_endian>
626 Output_data_got<size, big_endian>::do_write(Output_file* of)
628 const int add = size / 8;
630 const off_t off = this->offset();
631 const off_t oview_size = this->data_size();
632 unsigned char* const oview = of->get_output_view(off, oview_size);
634 unsigned char* pov = oview;
635 for (typename Got_entries::const_iterator p = this->entries_.begin();
636 p != this->entries_.end();
643 gold_assert(pov - oview == oview_size);
645 of->write_output_view(off, oview_size, oview);
647 // We no longer need the GOT entries.
648 this->entries_.clear();
651 // Output_data_dynamic::Dynamic_entry methods.
653 // Write out the entry.
655 template<int size, bool big_endian>
657 Output_data_dynamic::Dynamic_entry::write(
659 const Stringpool* pool
660 ACCEPT_SIZE_ENDIAN) const
662 typename elfcpp::Elf_types<size>::Elf_WXword val;
663 switch (this->classification_)
669 case DYNAMIC_SECTION_ADDRESS:
670 val = this->u_.od->address();
673 case DYNAMIC_SECTION_SIZE:
674 val = this->u_.od->data_size();
679 const Sized_symbol<size>* s =
680 static_cast<const Sized_symbol<size>*>(this->u_.sym);
686 val = pool->get_offset(this->u_.str);
693 elfcpp::Dyn_write<size, big_endian> dw(pov);
694 dw.put_d_tag(this->tag_);
698 // Output_data_dynamic methods.
700 // Adjust the output section to set the entry size.
703 Output_data_dynamic::do_adjust_output_section(Output_section* os)
705 if (this->target_->get_size() == 32)
706 os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size);
707 else if (this->target_->get_size() == 64)
708 os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size);
713 // Set the final data size.
716 Output_data_dynamic::do_set_address(uint64_t, off_t)
718 // Add the terminating entry.
719 this->add_constant(elfcpp::DT_NULL, 0);
722 if (this->target_->get_size() == 32)
723 dyn_size = elfcpp::Elf_sizes<32>::dyn_size;
724 else if (this->target_->get_size() == 64)
725 dyn_size = elfcpp::Elf_sizes<64>::dyn_size;
728 this->set_data_size(this->entries_.size() * dyn_size);
731 // Write out the dynamic entries.
734 Output_data_dynamic::do_write(Output_file* of)
736 if (this->target_->get_size() == 32)
738 if (this->target_->is_big_endian())
739 this->sized_write<32, true>(of);
741 this->sized_write<32, false>(of);
743 else if (this->target_->get_size() == 64)
745 if (this->target_->is_big_endian())
746 this->sized_write<64, true>(of);
748 this->sized_write<64, false>(of);
754 template<int size, bool big_endian>
756 Output_data_dynamic::sized_write(Output_file* of)
758 const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size;
760 const off_t offset = this->offset();
761 const off_t oview_size = this->data_size();
762 unsigned char* const oview = of->get_output_view(offset, oview_size);
764 unsigned char* pov = oview;
765 for (typename Dynamic_entries::const_iterator p = this->entries_.begin();
766 p != this->entries_.end();
769 p->write SELECT_SIZE_ENDIAN_NAME(size, big_endian)(
770 pov, this->pool_ SELECT_SIZE_ENDIAN(size, big_endian));
774 gold_assert(pov - oview == oview_size);
776 of->write_output_view(offset, oview_size, oview);
778 // We no longer need the dynamic entries.
779 this->entries_.clear();
782 // Output_section::Input_section methods.
784 // Return the data size. For an input section we store the size here.
785 // For an Output_section_data, we have to ask it for the size.
788 Output_section::Input_section::data_size() const
790 if (this->is_input_section())
791 return this->u1_.data_size;
793 return this->u2_.posd->data_size();
796 // Set the address and file offset.
799 Output_section::Input_section::set_address(uint64_t addr, off_t off,
802 if (this->is_input_section())
803 this->u2_.object->set_section_offset(this->shndx_, off - secoff);
805 this->u2_.posd->set_address(addr, off);
808 // Try to turn an input address into an output address.
811 Output_section::Input_section::output_address(const Relobj* object,
814 uint64_t output_section_address,
815 uint64_t *poutput) const
817 if (!this->is_input_section())
818 return this->u2_.posd->output_address(object, shndx, offset,
819 output_section_address, poutput);
822 if (this->u2_.object != object)
825 Output_section* os = object->output_section(shndx, &output_offset);
826 gold_assert(os != NULL);
827 *poutput = output_section_address + output_offset + offset;
832 // Write out the data. We don't have to do anything for an input
833 // section--they are handled via Object::relocate--but this is where
834 // we write out the data for an Output_section_data.
837 Output_section::Input_section::write(Output_file* of)
839 if (!this->is_input_section())
840 this->u2_.posd->write(of);
843 // Output_section methods.
845 // Construct an Output_section. NAME will point into a Stringpool.
847 Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
848 elfcpp::Elf_Xword flags)
862 first_input_offset_(0),
864 needs_symtab_index_(false),
865 needs_dynsym_index_(false),
866 should_link_to_symtab_(false),
867 should_link_to_dynsym_(false)
871 Output_section::~Output_section()
875 // Set the entry size.
878 Output_section::set_entsize(uint64_t v)
880 if (this->entsize_ == 0)
883 gold_assert(this->entsize_ == v);
886 // Add the input section SHNDX, with header SHDR, named SECNAME, in
887 // OBJECT, to the Output_section. Return the offset of the input
888 // section within the output section. We don't always keep track of
889 // input sections for an Output_section. Instead, each Object keeps
890 // track of the Output_section for each of its input sections.
892 template<int size, bool big_endian>
894 Output_section::add_input_section(Relobj* object, unsigned int shndx,
896 const elfcpp::Shdr<size, big_endian>& shdr)
898 elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
899 if ((addralign & (addralign - 1)) != 0)
901 fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"),
902 program_name, object->name().c_str(),
903 static_cast<unsigned long>(addralign), secname);
907 if (addralign > this->addralign_)
908 this->addralign_ = addralign;
910 // If this is a SHF_MERGE section, we pass all the input sections to
911 // a Output_data_merge.
912 if ((shdr.get_sh_flags() & elfcpp::SHF_MERGE) != 0)
914 if (this->add_merge_input_section(object, shndx, shdr.get_sh_flags(),
915 shdr.get_sh_entsize(),
918 // Tell the relocation routines that they need to call the
919 // output_address method to determine the final address.
924 off_t offset_in_section = this->data_size();
925 off_t aligned_offset_in_section = align_address(offset_in_section,
928 if (aligned_offset_in_section > offset_in_section
929 && (shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0
930 && object->target()->has_code_fill())
932 // We need to add some fill data. Using fill_list_ when
933 // possible is an optimization, since we will often have fill
934 // sections without input sections.
935 off_t fill_len = aligned_offset_in_section - offset_in_section;
936 if (this->input_sections_.empty())
937 this->fills_.push_back(Fill(offset_in_section, fill_len));
940 // FIXME: When relaxing, the size needs to adjust to
941 // maintain a constant alignment.
942 std::string fill_data(object->target()->code_fill(fill_len));
943 Output_data_const* odc = new Output_data_const(fill_data, 1);
944 this->input_sections_.push_back(Input_section(odc));
948 this->set_data_size(aligned_offset_in_section + shdr.get_sh_size());
950 // We need to keep track of this section if we are already keeping
951 // track of sections, or if we are relaxing. FIXME: Add test for
953 if (!this->input_sections_.empty())
954 this->input_sections_.push_back(Input_section(object, shndx,
958 return aligned_offset_in_section;
961 // Add arbitrary data to an output section.
964 Output_section::add_output_section_data(Output_section_data* posd)
966 Input_section inp(posd);
967 this->add_output_section_data(&inp);
970 // Add arbitrary data to an output section by Input_section.
973 Output_section::add_output_section_data(Input_section* inp)
975 if (this->input_sections_.empty())
976 this->first_input_offset_ = this->data_size();
978 this->input_sections_.push_back(*inp);
980 uint64_t addralign = inp->addralign();
981 if (addralign > this->addralign_)
982 this->addralign_ = addralign;
984 inp->set_output_section(this);
987 // Add a merge section to an output section.
990 Output_section::add_output_merge_section(Output_section_data* posd,
991 bool is_string, uint64_t entsize)
993 Input_section inp(posd, is_string, entsize);
994 this->add_output_section_data(&inp);
997 // Add an input section to a SHF_MERGE section.
1000 Output_section::add_merge_input_section(Relobj* object, unsigned int shndx,
1001 uint64_t flags, uint64_t entsize,
1004 // We only merge constants if the alignment is not more than the
1005 // entry size. This could be handled, but it's unusual.
1006 if (addralign > entsize)
1009 bool is_string = (flags & elfcpp::SHF_STRINGS) != 0;
1010 Input_section_list::iterator p;
1011 for (p = this->input_sections_.begin();
1012 p != this->input_sections_.end();
1014 if (p->is_merge_section(is_string, entsize))
1017 // We handle the actual constant merging in Output_merge_data or
1018 // Output_merge_string_data.
1019 if (p != this->input_sections_.end())
1020 p->add_input_section(object, shndx);
1023 Output_section_data* posd;
1025 posd = new Output_merge_data(entsize);
1026 else if (entsize == 1)
1027 posd = new Output_merge_string<char>();
1028 else if (entsize == 2)
1029 posd = new Output_merge_string<uint16_t>();
1030 else if (entsize == 4)
1031 posd = new Output_merge_string<uint32_t>();
1035 this->add_output_merge_section(posd, is_string, entsize);
1036 posd->add_input_section(object, shndx);
1042 // Return the output virtual address of OFFSET relative to the start
1043 // of input section SHNDX in object OBJECT.
1046 Output_section::output_address(const Relobj* object, unsigned int shndx,
1049 uint64_t addr = this->address() + this->first_input_offset_;
1050 for (Input_section_list::const_iterator p = this->input_sections_.begin();
1051 p != this->input_sections_.end();
1054 addr = align_address(addr, p->addralign());
1056 if (p->output_address(object, shndx, offset, addr, &output))
1058 addr += p->data_size();
1061 // If we get here, it means that we don't know the mapping for this
1062 // input section. This might happen in principle if
1063 // add_input_section were called before add_output_section_data.
1064 // But it should never actually happen.
1069 // Set the address of an Output_section. This is where we handle
1070 // setting the addresses of any Output_section_data objects.
1073 Output_section::do_set_address(uint64_t address, off_t startoff)
1075 if (this->input_sections_.empty())
1078 off_t off = startoff + this->first_input_offset_;
1079 for (Input_section_list::iterator p = this->input_sections_.begin();
1080 p != this->input_sections_.end();
1083 off = align_address(off, p->addralign());
1084 p->set_address(address + (off - startoff), off, startoff);
1085 off += p->data_size();
1088 this->set_data_size(off - startoff);
1091 // Write the section header to *OSHDR.
1093 template<int size, bool big_endian>
1095 Output_section::write_header(const Layout* layout,
1096 const Stringpool* secnamepool,
1097 elfcpp::Shdr_write<size, big_endian>* oshdr) const
1099 oshdr->put_sh_name(secnamepool->get_offset(this->name_));
1100 oshdr->put_sh_type(this->type_);
1101 oshdr->put_sh_flags(this->flags_);
1102 oshdr->put_sh_addr(this->address());
1103 oshdr->put_sh_offset(this->offset());
1104 oshdr->put_sh_size(this->data_size());
1105 if (this->link_section_ != NULL)
1106 oshdr->put_sh_link(this->link_section_->out_shndx());
1107 else if (this->should_link_to_symtab_)
1108 oshdr->put_sh_link(layout->symtab_section()->out_shndx());
1109 else if (this->should_link_to_dynsym_)
1110 oshdr->put_sh_link(layout->dynsym_section()->out_shndx());
1112 oshdr->put_sh_link(this->link_);
1113 if (this->info_section_ != NULL)
1114 oshdr->put_sh_info(this->info_section_->out_shndx());
1116 oshdr->put_sh_info(this->info_);
1117 oshdr->put_sh_addralign(this->addralign_);
1118 oshdr->put_sh_entsize(this->entsize_);
1121 // Write out the data. For input sections the data is written out by
1122 // Object::relocate, but we have to handle Output_section_data objects
1126 Output_section::do_write(Output_file* of)
1128 off_t output_section_file_offset = this->offset();
1129 for (Fill_list::iterator p = this->fills_.begin();
1130 p != this->fills_.end();
1133 std::string fill_data(of->target()->code_fill(p->length()));
1134 of->write(output_section_file_offset + p->section_offset(),
1135 fill_data.data(), fill_data.size());
1138 for (Input_section_list::iterator p = this->input_sections_.begin();
1139 p != this->input_sections_.end();
1144 // Output segment methods.
1146 Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags)
1157 is_align_known_(false)
1161 // Add an Output_section to an Output_segment.
1164 Output_segment::add_output_section(Output_section* os,
1165 elfcpp::Elf_Word seg_flags,
1168 gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
1169 gold_assert(!this->is_align_known_);
1171 // Update the segment flags.
1172 this->flags_ |= seg_flags;
1174 Output_segment::Output_data_list* pdl;
1175 if (os->type() == elfcpp::SHT_NOBITS)
1176 pdl = &this->output_bss_;
1178 pdl = &this->output_data_;
1180 // So that PT_NOTE segments will work correctly, we need to ensure
1181 // that all SHT_NOTE sections are adjacent. This will normally
1182 // happen automatically, because all the SHT_NOTE input sections
1183 // will wind up in the same output section. However, it is possible
1184 // for multiple SHT_NOTE input sections to have different section
1185 // flags, and thus be in different output sections, but for the
1186 // different section flags to map into the same segment flags and
1187 // thus the same output segment.
1189 // Note that while there may be many input sections in an output
1190 // section, there are normally only a few output sections in an
1191 // output segment. This loop is expected to be fast.
1193 if (os->type() == elfcpp::SHT_NOTE && !pdl->empty())
1195 Output_segment::Output_data_list::iterator p = pdl->end();
1199 if ((*p)->is_section_type(elfcpp::SHT_NOTE))
1201 // We don't worry about the FRONT parameter.
1207 while (p != pdl->begin());
1210 // Similarly, so that PT_TLS segments will work, we need to group
1211 // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special
1212 // case: we group the SHF_TLS/SHT_NOBITS sections right after the
1213 // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS
1215 if ((os->flags() & elfcpp::SHF_TLS) != 0 && !this->output_data_.empty())
1217 pdl = &this->output_data_;
1218 bool nobits = os->type() == elfcpp::SHT_NOBITS;
1219 bool sawtls = false;
1220 Output_segment::Output_data_list::iterator p = pdl->end();
1225 if ((*p)->is_section_flag_set(elfcpp::SHF_TLS))
1228 // Put a NOBITS section after the first TLS section.
1229 // But a PROGBITS section after the first TLS/PROGBITS
1231 insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS);
1235 // If we've gone past the TLS sections, but we've seen a
1236 // TLS section, then we need to insert this section now.
1242 // We don't worry about the FRONT parameter.
1248 while (p != pdl->begin());
1250 // There are no TLS sections yet; put this one at the requested
1251 // location in the section list.
1255 pdl->push_front(os);
1260 // Add an Output_data (which is not an Output_section) to the start of
1264 Output_segment::add_initial_output_data(Output_data* od)
1266 gold_assert(!this->is_align_known_);
1267 this->output_data_.push_front(od);
1270 // Return the maximum alignment of the Output_data in Output_segment.
1271 // Once we compute this, we prohibit new sections from being added.
1274 Output_segment::addralign()
1276 if (!this->is_align_known_)
1280 addralign = Output_segment::maximum_alignment(&this->output_data_);
1281 if (addralign > this->align_)
1282 this->align_ = addralign;
1284 addralign = Output_segment::maximum_alignment(&this->output_bss_);
1285 if (addralign > this->align_)
1286 this->align_ = addralign;
1288 this->is_align_known_ = true;
1291 return this->align_;
1294 // Return the maximum alignment of a list of Output_data.
1297 Output_segment::maximum_alignment(const Output_data_list* pdl)
1300 for (Output_data_list::const_iterator p = pdl->begin();
1304 uint64_t addralign = (*p)->addralign();
1305 if (addralign > ret)
1311 // Set the section addresses for an Output_segment. ADDR is the
1312 // address and *POFF is the file offset. Set the section indexes
1313 // starting with *PSHNDX. Return the address of the immediately
1314 // following segment. Update *POFF and *PSHNDX.
1317 Output_segment::set_section_addresses(uint64_t addr, off_t* poff,
1318 unsigned int* pshndx)
1320 gold_assert(this->type_ == elfcpp::PT_LOAD);
1322 this->vaddr_ = addr;
1323 this->paddr_ = addr;
1325 off_t orig_off = *poff;
1326 this->offset_ = orig_off;
1328 *poff = align_address(*poff, this->addralign());
1330 addr = this->set_section_list_addresses(&this->output_data_, addr, poff,
1332 this->filesz_ = *poff - orig_off;
1336 uint64_t ret = this->set_section_list_addresses(&this->output_bss_, addr,
1338 this->memsz_ = *poff - orig_off;
1340 // Ignore the file offset adjustments made by the BSS Output_data
1347 // Set the addresses and file offsets in a list of Output_data
1351 Output_segment::set_section_list_addresses(Output_data_list* pdl,
1352 uint64_t addr, off_t* poff,
1353 unsigned int* pshndx)
1355 off_t startoff = *poff;
1357 off_t off = startoff;
1358 for (Output_data_list::iterator p = pdl->begin();
1362 off = align_address(off, (*p)->addralign());
1363 (*p)->set_address(addr + (off - startoff), off);
1365 // Unless this is a PT_TLS segment, we want to ignore the size
1366 // of a SHF_TLS/SHT_NOBITS section. Such a section does not
1367 // affect the size of a PT_LOAD segment.
1368 if (this->type_ == elfcpp::PT_TLS
1369 || !(*p)->is_section_flag_set(elfcpp::SHF_TLS)
1370 || !(*p)->is_section_type(elfcpp::SHT_NOBITS))
1371 off += (*p)->data_size();
1373 if ((*p)->is_section())
1375 (*p)->set_out_shndx(*pshndx);
1381 return addr + (off - startoff);
1384 // For a non-PT_LOAD segment, set the offset from the sections, if
1388 Output_segment::set_offset()
1390 gold_assert(this->type_ != elfcpp::PT_LOAD);
1392 if (this->output_data_.empty() && this->output_bss_.empty())
1403 const Output_data* first;
1404 if (this->output_data_.empty())
1405 first = this->output_bss_.front();
1407 first = this->output_data_.front();
1408 this->vaddr_ = first->address();
1409 this->paddr_ = this->vaddr_;
1410 this->offset_ = first->offset();
1412 if (this->output_data_.empty())
1416 const Output_data* last_data = this->output_data_.back();
1417 this->filesz_ = (last_data->address()
1418 + last_data->data_size()
1422 const Output_data* last;
1423 if (this->output_bss_.empty())
1424 last = this->output_data_.back();
1426 last = this->output_bss_.back();
1427 this->memsz_ = (last->address()
1432 // Return the number of Output_sections in an Output_segment.
1435 Output_segment::output_section_count() const
1437 return (this->output_section_count_list(&this->output_data_)
1438 + this->output_section_count_list(&this->output_bss_));
1441 // Return the number of Output_sections in an Output_data_list.
1444 Output_segment::output_section_count_list(const Output_data_list* pdl) const
1446 unsigned int count = 0;
1447 for (Output_data_list::const_iterator p = pdl->begin();
1451 if ((*p)->is_section())
1457 // Write the segment data into *OPHDR.
1459 template<int size, bool big_endian>
1461 Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr)
1463 ophdr->put_p_type(this->type_);
1464 ophdr->put_p_offset(this->offset_);
1465 ophdr->put_p_vaddr(this->vaddr_);
1466 ophdr->put_p_paddr(this->paddr_);
1467 ophdr->put_p_filesz(this->filesz_);
1468 ophdr->put_p_memsz(this->memsz_);
1469 ophdr->put_p_flags(this->flags_);
1470 ophdr->put_p_align(this->addralign());
1473 // Write the section headers into V.
1475 template<int size, bool big_endian>
1477 Output_segment::write_section_headers(const Layout* layout,
1478 const Stringpool* secnamepool,
1480 unsigned int *pshndx
1481 ACCEPT_SIZE_ENDIAN) const
1483 // Every section that is attached to a segment must be attached to a
1484 // PT_LOAD segment, so we only write out section headers for PT_LOAD
1486 if (this->type_ != elfcpp::PT_LOAD)
1489 v = this->write_section_headers_list
1490 SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
1491 layout, secnamepool, &this->output_data_, v, pshndx
1492 SELECT_SIZE_ENDIAN(size, big_endian));
1493 v = this->write_section_headers_list
1494 SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
1495 layout, secnamepool, &this->output_bss_, v, pshndx
1496 SELECT_SIZE_ENDIAN(size, big_endian));
1500 template<int size, bool big_endian>
1502 Output_segment::write_section_headers_list(const Layout* layout,
1503 const Stringpool* secnamepool,
1504 const Output_data_list* pdl,
1506 unsigned int* pshndx
1507 ACCEPT_SIZE_ENDIAN) const
1509 const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
1510 for (Output_data_list::const_iterator p = pdl->begin();
1514 if ((*p)->is_section())
1516 const Output_section* ps = static_cast<const Output_section*>(*p);
1517 gold_assert(*pshndx == ps->out_shndx());
1518 elfcpp::Shdr_write<size, big_endian> oshdr(v);
1519 ps->write_header(layout, secnamepool, &oshdr);
1527 // Output_file methods.
1529 Output_file::Output_file(const General_options& options, Target* target)
1530 : options_(options),
1532 name_(options.output_file_name()),
1539 // Open the output file.
1542 Output_file::open(off_t file_size)
1544 this->file_size_ = file_size;
1546 int mode = parameters->output_is_object() ? 0666 : 0777;
1547 int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode);
1550 fprintf(stderr, _("%s: %s: open: %s\n"),
1551 program_name, this->name_, strerror(errno));
1556 // Write out one byte to make the file the right size.
1557 if (::lseek(o, file_size - 1, SEEK_SET) < 0)
1559 fprintf(stderr, _("%s: %s: lseek: %s\n"),
1560 program_name, this->name_, strerror(errno));
1564 if (::write(o, &b, 1) != 1)
1566 fprintf(stderr, _("%s: %s: write: %s\n"),
1567 program_name, this->name_, strerror(errno));
1571 // Map the file into memory.
1572 void* base = ::mmap(NULL, file_size, PROT_READ | PROT_WRITE,
1574 if (base == MAP_FAILED)
1576 fprintf(stderr, _("%s: %s: mmap: %s\n"),
1577 program_name, this->name_, strerror(errno));
1580 this->base_ = static_cast<unsigned char*>(base);
1583 // Close the output file.
1586 Output_file::close()
1588 if (::munmap(this->base_, this->file_size_) < 0)
1590 fprintf(stderr, _("%s: %s: munmap: %s\n"),
1591 program_name, this->name_, strerror(errno));
1596 if (::close(this->o_) < 0)
1598 fprintf(stderr, _("%s: %s: close: %s\n"),
1599 program_name, this->name_, strerror(errno));
1605 // Instantiate the templates we need. We could use the configure
1606 // script to restrict this to only the ones for implemented targets.
1608 #ifdef HAVE_TARGET_32_LITTLE
1611 Output_section::add_input_section<32, false>(
1614 const char* secname,
1615 const elfcpp::Shdr<32, false>& shdr);
1618 #ifdef HAVE_TARGET_32_BIG
1621 Output_section::add_input_section<32, true>(
1624 const char* secname,
1625 const elfcpp::Shdr<32, true>& shdr);
1628 #ifdef HAVE_TARGET_64_LITTLE
1631 Output_section::add_input_section<64, false>(
1634 const char* secname,
1635 const elfcpp::Shdr<64, false>& shdr);
1638 #ifdef HAVE_TARGET_64_BIG
1641 Output_section::add_input_section<64, true>(
1644 const char* secname,
1645 const elfcpp::Shdr<64, true>& shdr);
1648 #ifdef HAVE_TARGET_32_LITTLE
1650 class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>;
1653 #ifdef HAVE_TARGET_32_BIG
1655 class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>;
1658 #ifdef HAVE_TARGET_64_LITTLE
1660 class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>;
1663 #ifdef HAVE_TARGET_64_BIG
1665 class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>;
1668 #ifdef HAVE_TARGET_32_LITTLE
1670 class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>;
1673 #ifdef HAVE_TARGET_32_BIG
1675 class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>;
1678 #ifdef HAVE_TARGET_64_LITTLE
1680 class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>;
1683 #ifdef HAVE_TARGET_64_BIG
1685 class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>;
1688 #ifdef HAVE_TARGET_32_LITTLE
1690 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>;
1693 #ifdef HAVE_TARGET_32_BIG
1695 class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>;
1698 #ifdef HAVE_TARGET_64_LITTLE
1700 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>;
1703 #ifdef HAVE_TARGET_64_BIG
1705 class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>;
1708 #ifdef HAVE_TARGET_32_LITTLE
1710 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>;
1713 #ifdef HAVE_TARGET_32_BIG
1715 class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>;
1718 #ifdef HAVE_TARGET_64_LITTLE
1720 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>;
1723 #ifdef HAVE_TARGET_64_BIG
1725 class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>;
1728 #ifdef HAVE_TARGET_32_LITTLE
1730 class Output_data_got<32, false>;
1733 #ifdef HAVE_TARGET_32_BIG
1735 class Output_data_got<32, true>;
1738 #ifdef HAVE_TARGET_64_LITTLE
1740 class Output_data_got<64, false>;
1743 #ifdef HAVE_TARGET_64_BIG
1745 class Output_data_got<64, true>;
1748 } // End namespace gold.