| // output.cc -- manage the output file for gold |
| |
| #include "gold.h" |
| |
| #include <cstdlib> |
| #include <cerrno> |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #include <algorithm> |
| |
| #include "object.h" |
| #include "symtab.h" |
| #include "reloc.h" |
| #include "output.h" |
| |
| namespace gold |
| { |
| |
| // Output_data variables. |
| |
| bool Output_data::sizes_are_fixed; |
| |
| // Output_data methods. |
| |
| Output_data::~Output_data() |
| { |
| } |
| |
| // Set the address and offset. |
| |
| void |
| Output_data::set_address(uint64_t addr, off_t off) |
| { |
| this->address_ = addr; |
| this->offset_ = off; |
| |
| // Let the child class know. |
| this->do_set_address(addr, off); |
| } |
| |
| // Return the default alignment for a size--32 or 64. |
| |
| uint64_t |
| Output_data::default_alignment(int size) |
| { |
| if (size == 32) |
| return 4; |
| else if (size == 64) |
| return 8; |
| else |
| gold_unreachable(); |
| } |
| |
| // Output_section_header methods. This currently assumes that the |
| // segment and section lists are complete at construction time. |
| |
| Output_section_headers::Output_section_headers( |
| int size, |
| bool big_endian, |
| const Layout* layout, |
| const Layout::Segment_list* segment_list, |
| const Layout::Section_list* unattached_section_list, |
| const Stringpool* secnamepool) |
| : size_(size), |
| big_endian_(big_endian), |
| layout_(layout), |
| segment_list_(segment_list), |
| unattached_section_list_(unattached_section_list), |
| secnamepool_(secnamepool) |
| { |
| // Count all the sections. Start with 1 for the null section. |
| off_t count = 1; |
| for (Layout::Segment_list::const_iterator p = segment_list->begin(); |
| p != segment_list->end(); |
| ++p) |
| if ((*p)->type() == elfcpp::PT_LOAD) |
| count += (*p)->output_section_count(); |
| count += unattached_section_list->size(); |
| |
| int shdr_size; |
| if (size == 32) |
| shdr_size = elfcpp::Elf_sizes<32>::shdr_size; |
| else if (size == 64) |
| shdr_size = elfcpp::Elf_sizes<64>::shdr_size; |
| else |
| gold_unreachable(); |
| |
| this->set_data_size(count * shdr_size); |
| } |
| |
| // Write out the section headers. |
| |
| void |
| Output_section_headers::do_write(Output_file* of) |
| { |
| if (this->size_ == 32) |
| { |
| if (this->big_endian_) |
| this->do_sized_write<32, true>(of); |
| else |
| this->do_sized_write<32, false>(of); |
| } |
| else if (this->size_ == 64) |
| { |
| if (this->big_endian_) |
| this->do_sized_write<64, true>(of); |
| else |
| this->do_sized_write<64, false>(of); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Output_section_headers::do_sized_write(Output_file* of) |
| { |
| off_t all_shdrs_size = this->data_size(); |
| unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size); |
| |
| const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| unsigned char* v = view; |
| |
| { |
| typename elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| oshdr.put_sh_name(0); |
| oshdr.put_sh_type(elfcpp::SHT_NULL); |
| oshdr.put_sh_flags(0); |
| oshdr.put_sh_addr(0); |
| oshdr.put_sh_offset(0); |
| oshdr.put_sh_size(0); |
| oshdr.put_sh_link(0); |
| oshdr.put_sh_info(0); |
| oshdr.put_sh_addralign(0); |
| oshdr.put_sh_entsize(0); |
| } |
| |
| v += shdr_size; |
| |
| unsigned shndx = 1; |
| for (Layout::Segment_list::const_iterator p = this->segment_list_->begin(); |
| p != this->segment_list_->end(); |
| ++p) |
| v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
| this->layout_, this->secnamepool_, v, &shndx |
| SELECT_SIZE_ENDIAN(size, big_endian)); |
| for (Layout::Section_list::const_iterator p = |
| this->unattached_section_list_->begin(); |
| p != this->unattached_section_list_->end(); |
| ++p) |
| { |
| gold_assert(shndx == (*p)->out_shndx()); |
| elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| (*p)->write_header(this->layout_, this->secnamepool_, &oshdr); |
| v += shdr_size; |
| ++shndx; |
| } |
| |
| of->write_output_view(this->offset(), all_shdrs_size, view); |
| } |
| |
| // Output_segment_header methods. |
| |
| Output_segment_headers::Output_segment_headers( |
| int size, |
| bool big_endian, |
| const Layout::Segment_list& segment_list) |
| : size_(size), big_endian_(big_endian), segment_list_(segment_list) |
| { |
| int phdr_size; |
| if (size == 32) |
| phdr_size = elfcpp::Elf_sizes<32>::phdr_size; |
| else if (size == 64) |
| phdr_size = elfcpp::Elf_sizes<64>::phdr_size; |
| else |
| gold_unreachable(); |
| |
| this->set_data_size(segment_list.size() * phdr_size); |
| } |
| |
| void |
| Output_segment_headers::do_write(Output_file* of) |
| { |
| if (this->size_ == 32) |
| { |
| if (this->big_endian_) |
| this->do_sized_write<32, true>(of); |
| else |
| this->do_sized_write<32, false>(of); |
| } |
| else if (this->size_ == 64) |
| { |
| if (this->big_endian_) |
| this->do_sized_write<64, true>(of); |
| else |
| this->do_sized_write<64, false>(of); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Output_segment_headers::do_sized_write(Output_file* of) |
| { |
| const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size; |
| off_t all_phdrs_size = this->segment_list_.size() * phdr_size; |
| unsigned char* view = of->get_output_view(this->offset(), |
| all_phdrs_size); |
| unsigned char* v = view; |
| for (Layout::Segment_list::const_iterator p = this->segment_list_.begin(); |
| p != this->segment_list_.end(); |
| ++p) |
| { |
| elfcpp::Phdr_write<size, big_endian> ophdr(v); |
| (*p)->write_header(&ophdr); |
| v += phdr_size; |
| } |
| |
| of->write_output_view(this->offset(), all_phdrs_size, view); |
| } |
| |
| // Output_file_header methods. |
| |
| Output_file_header::Output_file_header(int size, |
| bool big_endian, |
| const General_options& options, |
| const Target* target, |
| const Symbol_table* symtab, |
| const Output_segment_headers* osh) |
| : size_(size), |
| big_endian_(big_endian), |
| options_(options), |
| target_(target), |
| symtab_(symtab), |
| segment_header_(osh), |
| section_header_(NULL), |
| shstrtab_(NULL) |
| { |
| int ehdr_size; |
| if (size == 32) |
| ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size; |
| else if (size == 64) |
| ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size; |
| else |
| gold_unreachable(); |
| |
| this->set_data_size(ehdr_size); |
| } |
| |
| // Set the section table information for a file header. |
| |
| void |
| Output_file_header::set_section_info(const Output_section_headers* shdrs, |
| const Output_section* shstrtab) |
| { |
| this->section_header_ = shdrs; |
| this->shstrtab_ = shstrtab; |
| } |
| |
| // Write out the file header. |
| |
| void |
| Output_file_header::do_write(Output_file* of) |
| { |
| if (this->size_ == 32) |
| { |
| if (this->big_endian_) |
| this->do_sized_write<32, true>(of); |
| else |
| this->do_sized_write<32, false>(of); |
| } |
| else if (this->size_ == 64) |
| { |
| if (this->big_endian_) |
| this->do_sized_write<64, true>(of); |
| else |
| this->do_sized_write<64, false>(of); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| // Write out the file header with appropriate size and endianess. |
| |
| template<int size, bool big_endian> |
| void |
| Output_file_header::do_sized_write(Output_file* of) |
| { |
| gold_assert(this->offset() == 0); |
| |
| int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size; |
| unsigned char* view = of->get_output_view(0, ehdr_size); |
| elfcpp::Ehdr_write<size, big_endian> oehdr(view); |
| |
| unsigned char e_ident[elfcpp::EI_NIDENT]; |
| memset(e_ident, 0, elfcpp::EI_NIDENT); |
| e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0; |
| e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1; |
| e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2; |
| e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3; |
| if (size == 32) |
| e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32; |
| else if (size == 64) |
| e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64; |
| else |
| gold_unreachable(); |
| e_ident[elfcpp::EI_DATA] = (big_endian |
| ? elfcpp::ELFDATA2MSB |
| : elfcpp::ELFDATA2LSB); |
| e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT; |
| // FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION. |
| oehdr.put_e_ident(e_ident); |
| |
| elfcpp::ET e_type; |
| // FIXME: ET_DYN. |
| if (this->options_.is_relocatable()) |
| e_type = elfcpp::ET_REL; |
| else |
| e_type = elfcpp::ET_EXEC; |
| oehdr.put_e_type(e_type); |
| |
| oehdr.put_e_machine(this->target_->machine_code()); |
| oehdr.put_e_version(elfcpp::EV_CURRENT); |
| |
| // FIXME: Need to support -e, and target specific entry symbol. |
| Symbol* sym = this->symtab_->lookup("_start"); |
| typename Sized_symbol<size>::Value_type v; |
| if (sym == NULL) |
| v = 0; |
| else |
| { |
| Sized_symbol<size>* ssym; |
| ssym = this->symtab_->get_sized_symbol SELECT_SIZE_NAME(size) ( |
| sym SELECT_SIZE(size)); |
| v = ssym->value(); |
| } |
| oehdr.put_e_entry(v); |
| |
| oehdr.put_e_phoff(this->segment_header_->offset()); |
| oehdr.put_e_shoff(this->section_header_->offset()); |
| |
| // FIXME: The target needs to set the flags. |
| oehdr.put_e_flags(0); |
| |
| oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size); |
| oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size); |
| oehdr.put_e_phnum(this->segment_header_->data_size() |
| / elfcpp::Elf_sizes<size>::phdr_size); |
| oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size); |
| oehdr.put_e_shnum(this->section_header_->data_size() |
| / elfcpp::Elf_sizes<size>::shdr_size); |
| oehdr.put_e_shstrndx(this->shstrtab_->out_shndx()); |
| |
| of->write_output_view(0, ehdr_size, view); |
| } |
| |
| // Output_data_const methods. |
| |
| void |
| Output_data_const::do_write(Output_file* of) |
| { |
| of->write(this->offset(), this->data_.data(), this->data_.size()); |
| } |
| |
| // Output_data_const_buffer methods. |
| |
| void |
| Output_data_const_buffer::do_write(Output_file* of) |
| { |
| of->write(this->offset(), this->p_, this->data_size()); |
| } |
| |
| // Output_section_data methods. |
| |
| // Record the output section, and set the entry size and such. |
| |
| void |
| Output_section_data::set_output_section(Output_section* os) |
| { |
| gold_assert(this->output_section_ == NULL); |
| this->output_section_ = os; |
| this->do_adjust_output_section(os); |
| } |
| |
| // Return the section index of the output section. |
| |
| unsigned int |
| Output_section_data::do_out_shndx() const |
| { |
| gold_assert(this->output_section_ != NULL); |
| return this->output_section_->out_shndx(); |
| } |
| |
| // Output_data_strtab methods. |
| |
| // Set the address. We don't actually care about the address, but we |
| // do set our final size. |
| |
| void |
| Output_data_strtab::do_set_address(uint64_t, off_t) |
| { |
| this->strtab_->set_string_offsets(); |
| this->set_data_size(this->strtab_->get_strtab_size()); |
| } |
| |
| // Write out a string table. |
| |
| void |
| Output_data_strtab::do_write(Output_file* of) |
| { |
| this->strtab_->write(of, this->offset()); |
| } |
| |
| // Output_reloc methods. |
| |
| // Get the symbol index of a relocation. |
| |
| template<bool dynamic, int size, bool big_endian> |
| unsigned int |
| Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::get_symbol_index() |
| const |
| { |
| unsigned int index; |
| switch (this->local_sym_index_) |
| { |
| case INVALID_CODE: |
| gold_unreachable(); |
| |
| case GSYM_CODE: |
| if (this->u1_.gsym == NULL) |
| index = 0; |
| else if (dynamic) |
| index = this->u1_.gsym->dynsym_index(); |
| else |
| index = this->u1_.gsym->symtab_index(); |
| break; |
| |
| case SECTION_CODE: |
| if (dynamic) |
| index = this->u1_.os->dynsym_index(); |
| else |
| index = this->u1_.os->symtab_index(); |
| break; |
| |
| default: |
| if (dynamic) |
| { |
| // FIXME: It seems that some targets may need to generate |
| // dynamic relocations against local symbols for some |
| // reasons. This will have to be addressed at some point. |
| gold_unreachable(); |
| } |
| else |
| index = this->u1_.relobj->symtab_index(this->local_sym_index_); |
| break; |
| } |
| gold_assert(index != -1U); |
| return index; |
| } |
| |
| // Write out the offset and info fields of a Rel or Rela relocation |
| // entry. |
| |
| template<bool dynamic, int size, bool big_endian> |
| template<typename Write_rel> |
| void |
| Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write_rel( |
| Write_rel* wr) const |
| { |
| Address address = this->address_; |
| if (this->shndx_ != INVALID_CODE) |
| { |
| off_t off; |
| Output_section* os = this->u2_.relobj->output_section(this->shndx_, |
| &off); |
| gold_assert(os != NULL); |
| address += os->address() + off; |
| } |
| else if (this->u2_.od != NULL) |
| address += this->u2_.od->address(); |
| wr->put_r_offset(address); |
| wr->put_r_info(elfcpp::elf_r_info<size>(this->get_symbol_index(), |
| this->type_)); |
| } |
| |
| // Write out a Rel relocation. |
| |
| template<bool dynamic, int size, bool big_endian> |
| void |
| Output_reloc<elfcpp::SHT_REL, dynamic, size, big_endian>::write( |
| unsigned char* pov) const |
| { |
| elfcpp::Rel_write<size, big_endian> orel(pov); |
| this->write_rel(&orel); |
| } |
| |
| // Write out a Rela relocation. |
| |
| template<bool dynamic, int size, bool big_endian> |
| void |
| Output_reloc<elfcpp::SHT_RELA, dynamic, size, big_endian>::write( |
| unsigned char* pov) const |
| { |
| elfcpp::Rela_write<size, big_endian> orel(pov); |
| this->rel_.write_rel(&orel); |
| orel.put_r_addend(this->addend_); |
| } |
| |
| // Output_data_reloc_base methods. |
| |
| // Adjust the output section. |
| |
| template<int sh_type, bool dynamic, int size, bool big_endian> |
| void |
| Output_data_reloc_base<sh_type, dynamic, size, big_endian> |
| ::do_adjust_output_section(Output_section* os) |
| { |
| if (sh_type == elfcpp::SHT_REL) |
| os->set_entsize(elfcpp::Elf_sizes<size>::rel_size); |
| else if (sh_type == elfcpp::SHT_RELA) |
| os->set_entsize(elfcpp::Elf_sizes<size>::rela_size); |
| else |
| gold_unreachable(); |
| if (dynamic) |
| os->set_should_link_to_dynsym(); |
| else |
| os->set_should_link_to_symtab(); |
| } |
| |
| // Write out relocation data. |
| |
| template<int sh_type, bool dynamic, int size, bool big_endian> |
| void |
| Output_data_reloc_base<sh_type, dynamic, size, big_endian>::do_write( |
| Output_file* of) |
| { |
| const off_t off = this->offset(); |
| const off_t oview_size = this->data_size(); |
| unsigned char* const oview = of->get_output_view(off, oview_size); |
| |
| unsigned char* pov = oview; |
| for (typename Relocs::const_iterator p = this->relocs_.begin(); |
| p != this->relocs_.end(); |
| ++p) |
| { |
| p->write(pov); |
| pov += reloc_size; |
| } |
| |
| gold_assert(pov - oview == oview_size); |
| |
| of->write_output_view(off, oview_size, oview); |
| |
| // We no longer need the relocation entries. |
| this->relocs_.clear(); |
| } |
| |
| // Output_data_got::Got_entry methods. |
| |
| // Write out the entry. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_got<size, big_endian>::Got_entry::write( |
| const General_options* options, |
| unsigned char* pov) const |
| { |
| Valtype val = 0; |
| |
| switch (this->local_sym_index_) |
| { |
| case GSYM_CODE: |
| { |
| Symbol* gsym = this->u_.gsym; |
| |
| // If the symbol is resolved locally, we need to write out its |
| // value. Otherwise we just write zero. The target code is |
| // responsible for creating a relocation entry to fill in the |
| // value at runtime. |
| if (gsym->final_value_is_known(options)) |
| { |
| Sized_symbol<size>* sgsym; |
| // This cast is a bit ugly. We don't want to put a |
| // virtual method in Symbol, because we want Symbol to be |
| // as small as possible. |
| sgsym = static_cast<Sized_symbol<size>*>(gsym); |
| val = sgsym->value(); |
| } |
| } |
| break; |
| |
| case CONSTANT_CODE: |
| val = this->u_.constant; |
| break; |
| |
| default: |
| gold_unreachable(); |
| } |
| |
| elfcpp::Swap<size, big_endian>::writeval(pov, val); |
| } |
| |
| // Output_data_got methods. |
| |
| // Add an entry for a global symbol to the GOT. This returns true if |
| // this is a new GOT entry, false if the symbol already had a GOT |
| // entry. |
| |
| template<int size, bool big_endian> |
| bool |
| Output_data_got<size, big_endian>::add_global(Symbol* gsym) |
| { |
| if (gsym->has_got_offset()) |
| return false; |
| |
| this->entries_.push_back(Got_entry(gsym)); |
| this->set_got_size(); |
| gsym->set_got_offset(this->last_got_offset()); |
| return true; |
| } |
| |
| // Write out the GOT. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_got<size, big_endian>::do_write(Output_file* of) |
| { |
| const int add = size / 8; |
| |
| const off_t off = this->offset(); |
| const off_t oview_size = this->data_size(); |
| unsigned char* const oview = of->get_output_view(off, oview_size); |
| |
| unsigned char* pov = oview; |
| for (typename Got_entries::const_iterator p = this->entries_.begin(); |
| p != this->entries_.end(); |
| ++p) |
| { |
| p->write(this->options_, pov); |
| pov += add; |
| } |
| |
| gold_assert(pov - oview == oview_size); |
| |
| of->write_output_view(off, oview_size, oview); |
| |
| // We no longer need the GOT entries. |
| this->entries_.clear(); |
| } |
| |
| // Output_data_dynamic::Dynamic_entry methods. |
| |
| // Write out the entry. |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_dynamic::Dynamic_entry::write( |
| unsigned char* pov, |
| const Stringpool* pool |
| ACCEPT_SIZE_ENDIAN) const |
| { |
| typename elfcpp::Elf_types<size>::Elf_WXword val; |
| switch (this->classification_) |
| { |
| case DYNAMIC_NUMBER: |
| val = this->u_.val; |
| break; |
| |
| case DYNAMIC_SECTION_ADDRESS: |
| val = this->u_.od->address(); |
| break; |
| |
| case DYNAMIC_SECTION_SIZE: |
| val = this->u_.od->data_size(); |
| break; |
| |
| case DYNAMIC_SYMBOL: |
| { |
| const Sized_symbol<size>* s = |
| static_cast<const Sized_symbol<size>*>(this->u_.sym); |
| val = s->value(); |
| } |
| break; |
| |
| case DYNAMIC_STRING: |
| val = pool->get_offset(this->u_.str); |
| break; |
| |
| default: |
| gold_unreachable(); |
| } |
| |
| elfcpp::Dyn_write<size, big_endian> dw(pov); |
| dw.put_d_tag(this->tag_); |
| dw.put_d_val(val); |
| } |
| |
| // Output_data_dynamic methods. |
| |
| // Adjust the output section to set the entry size. |
| |
| void |
| Output_data_dynamic::do_adjust_output_section(Output_section* os) |
| { |
| if (this->target_->get_size() == 32) |
| os->set_entsize(elfcpp::Elf_sizes<32>::dyn_size); |
| else if (this->target_->get_size() == 64) |
| os->set_entsize(elfcpp::Elf_sizes<64>::dyn_size); |
| else |
| gold_unreachable(); |
| } |
| |
| // Set the final data size. |
| |
| void |
| Output_data_dynamic::do_set_address(uint64_t, off_t) |
| { |
| // Add the terminating entry. |
| this->add_constant(elfcpp::DT_NULL, 0); |
| |
| int dyn_size; |
| if (this->target_->get_size() == 32) |
| dyn_size = elfcpp::Elf_sizes<32>::dyn_size; |
| else if (this->target_->get_size() == 64) |
| dyn_size = elfcpp::Elf_sizes<64>::dyn_size; |
| else |
| gold_unreachable(); |
| this->set_data_size(this->entries_.size() * dyn_size); |
| } |
| |
| // Write out the dynamic entries. |
| |
| void |
| Output_data_dynamic::do_write(Output_file* of) |
| { |
| if (this->target_->get_size() == 32) |
| { |
| if (this->target_->is_big_endian()) |
| this->sized_write<32, true>(of); |
| else |
| this->sized_write<32, false>(of); |
| } |
| else if (this->target_->get_size() == 64) |
| { |
| if (this->target_->is_big_endian()) |
| this->sized_write<64, true>(of); |
| else |
| this->sized_write<64, false>(of); |
| } |
| else |
| gold_unreachable(); |
| } |
| |
| template<int size, bool big_endian> |
| void |
| Output_data_dynamic::sized_write(Output_file* of) |
| { |
| const int dyn_size = elfcpp::Elf_sizes<size>::dyn_size; |
| |
| const off_t offset = this->offset(); |
| const off_t oview_size = this->data_size(); |
| unsigned char* const oview = of->get_output_view(offset, oview_size); |
| |
| unsigned char* pov = oview; |
| for (typename Dynamic_entries::const_iterator p = this->entries_.begin(); |
| p != this->entries_.end(); |
| ++p) |
| { |
| p->write SELECT_SIZE_ENDIAN_NAME(size, big_endian)( |
| pov, this->pool_ SELECT_SIZE_ENDIAN(size, big_endian)); |
| pov += dyn_size; |
| } |
| |
| gold_assert(pov - oview == oview_size); |
| |
| of->write_output_view(offset, oview_size, oview); |
| |
| // We no longer need the dynamic entries. |
| this->entries_.clear(); |
| } |
| |
| // Output_section::Input_section methods. |
| |
| // Return the data size. For an input section we store the size here. |
| // For an Output_section_data, we have to ask it for the size. |
| |
| off_t |
| Output_section::Input_section::data_size() const |
| { |
| if (this->is_input_section()) |
| return this->data_size_; |
| else |
| return this->u_.posd->data_size(); |
| } |
| |
| // Set the address and file offset. |
| |
| void |
| Output_section::Input_section::set_address(uint64_t addr, off_t off, |
| off_t secoff) |
| { |
| if (this->is_input_section()) |
| this->u_.object->set_section_offset(this->shndx_, off - secoff); |
| else |
| this->u_.posd->set_address(addr, off); |
| } |
| |
| // Write out the data. We don't have to do anything for an input |
| // section--they are handled via Object::relocate--but this is where |
| // we write out the data for an Output_section_data. |
| |
| void |
| Output_section::Input_section::write(Output_file* of) |
| { |
| if (!this->is_input_section()) |
| this->u_.posd->write(of); |
| } |
| |
| // Output_section methods. |
| |
| // Construct an Output_section. NAME will point into a Stringpool. |
| |
| Output_section::Output_section(const char* name, elfcpp::Elf_Word type, |
| elfcpp::Elf_Xword flags, bool may_add_data) |
| : name_(name), |
| addralign_(0), |
| entsize_(0), |
| link_section_(NULL), |
| link_(0), |
| info_section_(NULL), |
| info_(0), |
| type_(type), |
| flags_(flags), |
| out_shndx_(0), |
| symtab_index_(0), |
| dynsym_index_(0), |
| input_sections_(), |
| first_input_offset_(0), |
| may_add_data_(may_add_data), |
| needs_symtab_index_(false), |
| needs_dynsym_index_(false), |
| should_link_to_symtab_(false), |
| should_link_to_dynsym_(false) |
| { |
| } |
| |
| Output_section::~Output_section() |
| { |
| } |
| |
| // Set the entry size. |
| |
| void |
| Output_section::set_entsize(uint64_t v) |
| { |
| if (this->entsize_ == 0) |
| this->entsize_ = v; |
| else |
| gold_assert(this->entsize_ == v); |
| } |
| |
| // Add the input section SHNDX, with header SHDR, named SECNAME, in |
| // OBJECT, to the Output_section. Return the offset of the input |
| // section within the output section. We don't always keep track of |
| // input sections for an Output_section. Instead, each Object keeps |
| // track of the Output_section for each of its input sections. |
| |
| template<int size, bool big_endian> |
| off_t |
| Output_section::add_input_section(Relobj* object, unsigned int shndx, |
| const char* secname, |
| const elfcpp::Shdr<size, big_endian>& shdr) |
| { |
| gold_assert(this->may_add_data_); |
| |
| elfcpp::Elf_Xword addralign = shdr.get_sh_addralign(); |
| if ((addralign & (addralign - 1)) != 0) |
| { |
| fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"), |
| program_name, object->name().c_str(), |
| static_cast<unsigned long>(addralign), secname); |
| gold_exit(false); |
| } |
| |
| if (addralign > this->addralign_) |
| this->addralign_ = addralign; |
| |
| off_t ssize = this->data_size(); |
| ssize = align_address(ssize, addralign); |
| this->set_data_size(ssize + shdr.get_sh_size()); |
| |
| // We need to keep track of this section if we are already keeping |
| // track of sections, or if we are relaxing. FIXME: Add test for |
| // relaxing. |
| if (! this->input_sections_.empty()) |
| this->input_sections_.push_back(Input_section(object, shndx, |
| shdr.get_sh_size(), |
| addralign)); |
| |
| return ssize; |
| } |
| |
| // Add arbitrary data to an output section. |
| |
| void |
| Output_section::add_output_section_data(Output_section_data* posd) |
| { |
| gold_assert(this->may_add_data_); |
| |
| if (this->input_sections_.empty()) |
| this->first_input_offset_ = this->data_size(); |
| |
| this->input_sections_.push_back(Input_section(posd)); |
| |
| uint64_t addralign = posd->addralign(); |
| if (addralign > this->addralign_) |
| this->addralign_ = addralign; |
| |
| posd->set_output_section(this); |
| } |
| |
| // Set the address of an Output_section. This is where we handle |
| // setting the addresses of any Output_section_data objects. |
| |
| void |
| Output_section::do_set_address(uint64_t address, off_t startoff) |
| { |
| if (this->input_sections_.empty()) |
| return; |
| |
| off_t off = startoff + this->first_input_offset_; |
| for (Input_section_list::iterator p = this->input_sections_.begin(); |
| p != this->input_sections_.end(); |
| ++p) |
| { |
| off = align_address(off, p->addralign()); |
| p->set_address(address + (off - startoff), off, startoff); |
| off += p->data_size(); |
| } |
| |
| this->set_data_size(off - startoff); |
| } |
| |
| // Write the section header to *OSHDR. |
| |
| template<int size, bool big_endian> |
| void |
| Output_section::write_header(const Layout* layout, |
| const Stringpool* secnamepool, |
| elfcpp::Shdr_write<size, big_endian>* oshdr) const |
| { |
| oshdr->put_sh_name(secnamepool->get_offset(this->name_)); |
| oshdr->put_sh_type(this->type_); |
| oshdr->put_sh_flags(this->flags_); |
| oshdr->put_sh_addr(this->address()); |
| oshdr->put_sh_offset(this->offset()); |
| oshdr->put_sh_size(this->data_size()); |
| if (this->link_section_ != NULL) |
| oshdr->put_sh_link(this->link_section_->out_shndx()); |
| else if (this->should_link_to_symtab_) |
| oshdr->put_sh_link(layout->symtab_section()->out_shndx()); |
| else if (this->should_link_to_dynsym_) |
| oshdr->put_sh_link(layout->dynsym_section()->out_shndx()); |
| else |
| oshdr->put_sh_link(this->link_); |
| if (this->info_section_ != NULL) |
| oshdr->put_sh_info(this->info_section_->out_shndx()); |
| else |
| oshdr->put_sh_info(this->info_); |
| oshdr->put_sh_addralign(this->addralign_); |
| oshdr->put_sh_entsize(this->entsize_); |
| } |
| |
| // Write out the data. For input sections the data is written out by |
| // Object::relocate, but we have to handle Output_section_data objects |
| // here. |
| |
| void |
| Output_section::do_write(Output_file* of) |
| { |
| for (Input_section_list::iterator p = this->input_sections_.begin(); |
| p != this->input_sections_.end(); |
| ++p) |
| p->write(of); |
| } |
| |
| // Output segment methods. |
| |
| Output_segment::Output_segment(elfcpp::Elf_Word type, elfcpp::Elf_Word flags) |
| : output_data_(), |
| output_bss_(), |
| vaddr_(0), |
| paddr_(0), |
| memsz_(0), |
| align_(0), |
| offset_(0), |
| filesz_(0), |
| type_(type), |
| flags_(flags), |
| is_align_known_(false) |
| { |
| } |
| |
| // Add an Output_section to an Output_segment. |
| |
| void |
| Output_segment::add_output_section(Output_section* os, |
| elfcpp::Elf_Word seg_flags, |
| bool front) |
| { |
| gold_assert((os->flags() & elfcpp::SHF_ALLOC) != 0); |
| gold_assert(!this->is_align_known_); |
| |
| // Update the segment flags. |
| this->flags_ |= seg_flags; |
| |
| Output_segment::Output_data_list* pdl; |
| if (os->type() == elfcpp::SHT_NOBITS) |
| pdl = &this->output_bss_; |
| else |
| pdl = &this->output_data_; |
| |
| // So that PT_NOTE segments will work correctly, we need to ensure |
| // that all SHT_NOTE sections are adjacent. This will normally |
| // happen automatically, because all the SHT_NOTE input sections |
| // will wind up in the same output section. However, it is possible |
| // for multiple SHT_NOTE input sections to have different section |
| // flags, and thus be in different output sections, but for the |
| // different section flags to map into the same segment flags and |
| // thus the same output segment. |
| |
| // Note that while there may be many input sections in an output |
| // section, there are normally only a few output sections in an |
| // output segment. This loop is expected to be fast. |
| |
| if (os->type() == elfcpp::SHT_NOTE && !pdl->empty()) |
| { |
| Output_segment::Output_data_list::iterator p = pdl->end(); |
| do |
| { |
| --p; |
| if ((*p)->is_section_type(elfcpp::SHT_NOTE)) |
| { |
| // We don't worry about the FRONT parameter. |
| ++p; |
| pdl->insert(p, os); |
| return; |
| } |
| } |
| while (p != pdl->begin()); |
| } |
| |
| // Similarly, so that PT_TLS segments will work, we need to group |
| // SHF_TLS sections. An SHF_TLS/SHT_NOBITS section is a special |
| // case: we group the SHF_TLS/SHT_NOBITS sections right after the |
| // SHF_TLS/SHT_PROGBITS sections. This lets us set up PT_TLS |
| // correctly. |
| if ((os->flags() & elfcpp::SHF_TLS) != 0 && !this->output_data_.empty()) |
| { |
| pdl = &this->output_data_; |
| bool nobits = os->type() == elfcpp::SHT_NOBITS; |
| bool sawtls = false; |
| Output_segment::Output_data_list::iterator p = pdl->end(); |
| do |
| { |
| --p; |
| bool insert; |
| if ((*p)->is_section_flag_set(elfcpp::SHF_TLS)) |
| { |
| sawtls = true; |
| // Put a NOBITS section after the first TLS section. |
| // But a PROGBITS section after the first TLS/PROGBITS |
| // section. |
| insert = nobits || !(*p)->is_section_type(elfcpp::SHT_NOBITS); |
| } |
| else |
| { |
| // If we've gone past the TLS sections, but we've seen a |
| // TLS section, then we need to insert this section now. |
| insert = sawtls; |
| } |
| |
| if (insert) |
| { |
| // We don't worry about the FRONT parameter. |
| ++p; |
| pdl->insert(p, os); |
| return; |
| } |
| } |
| while (p != pdl->begin()); |
| |
| // There are no TLS sections yet; put this one at the requested |
| // location in the section list. |
| } |
| |
| if (front) |
| pdl->push_front(os); |
| else |
| pdl->push_back(os); |
| } |
| |
| // Add an Output_data (which is not an Output_section) to the start of |
| // a segment. |
| |
| void |
| Output_segment::add_initial_output_data(Output_data* od) |
| { |
| gold_assert(!this->is_align_known_); |
| this->output_data_.push_front(od); |
| } |
| |
| // Return the maximum alignment of the Output_data in Output_segment. |
| // Once we compute this, we prohibit new sections from being added. |
| |
| uint64_t |
| Output_segment::addralign() |
| { |
| if (!this->is_align_known_) |
| { |
| uint64_t addralign; |
| |
| addralign = Output_segment::maximum_alignment(&this->output_data_); |
| if (addralign > this->align_) |
| this->align_ = addralign; |
| |
| addralign = Output_segment::maximum_alignment(&this->output_bss_); |
| if (addralign > this->align_) |
| this->align_ = addralign; |
| |
| this->is_align_known_ = true; |
| } |
| |
| return this->align_; |
| } |
| |
| // Return the maximum alignment of a list of Output_data. |
| |
| uint64_t |
| Output_segment::maximum_alignment(const Output_data_list* pdl) |
| { |
| uint64_t ret = 0; |
| for (Output_data_list::const_iterator p = pdl->begin(); |
| p != pdl->end(); |
| ++p) |
| { |
| uint64_t addralign = (*p)->addralign(); |
| if (addralign > ret) |
| ret = addralign; |
| } |
| return ret; |
| } |
| |
| // Set the section addresses for an Output_segment. ADDR is the |
| // address and *POFF is the file offset. Set the section indexes |
| // starting with *PSHNDX. Return the address of the immediately |
| // following segment. Update *POFF and *PSHNDX. |
| |
| uint64_t |
| Output_segment::set_section_addresses(uint64_t addr, off_t* poff, |
| unsigned int* pshndx) |
| { |
| gold_assert(this->type_ == elfcpp::PT_LOAD); |
| |
| this->vaddr_ = addr; |
| this->paddr_ = addr; |
| |
| off_t orig_off = *poff; |
| this->offset_ = orig_off; |
| |
| *poff = align_address(*poff, this->addralign()); |
| |
| addr = this->set_section_list_addresses(&this->output_data_, addr, poff, |
| pshndx); |
| this->filesz_ = *poff - orig_off; |
| |
| off_t off = *poff; |
| |
| uint64_t ret = this->set_section_list_addresses(&this->output_bss_, addr, |
| poff, pshndx); |
| this->memsz_ = *poff - orig_off; |
| |
| // Ignore the file offset adjustments made by the BSS Output_data |
| // objects. |
| *poff = off; |
| |
| return ret; |
| } |
| |
| // Set the addresses in a list of Output_data structures. |
| |
| uint64_t |
| Output_segment::set_section_list_addresses(Output_data_list* pdl, |
| uint64_t addr, off_t* poff, |
| unsigned int* pshndx) |
| { |
| off_t startoff = *poff; |
| |
| off_t off = startoff; |
| for (Output_data_list::iterator p = pdl->begin(); |
| p != pdl->end(); |
| ++p) |
| { |
| off = align_address(off, (*p)->addralign()); |
| (*p)->set_address(addr + (off - startoff), off); |
| |
| // Unless this is a PT_TLS segment, we want to ignore the size |
| // of a SHF_TLS/SHT_NOBITS section. Such a section does not |
| // affect the size of a PT_LOAD segment. |
| if (this->type_ == elfcpp::PT_TLS |
| || !(*p)->is_section_flag_set(elfcpp::SHF_TLS) |
| || !(*p)->is_section_type(elfcpp::SHT_NOBITS)) |
| off += (*p)->data_size(); |
| |
| if ((*p)->is_section()) |
| { |
| (*p)->set_out_shndx(*pshndx); |
| ++*pshndx; |
| } |
| } |
| |
| *poff = off; |
| return addr + (off - startoff); |
| } |
| |
| // For a non-PT_LOAD segment, set the offset from the sections, if |
| // any. |
| |
| void |
| Output_segment::set_offset() |
| { |
| gold_assert(this->type_ != elfcpp::PT_LOAD); |
| |
| if (this->output_data_.empty() && this->output_bss_.empty()) |
| { |
| this->vaddr_ = 0; |
| this->paddr_ = 0; |
| this->memsz_ = 0; |
| this->align_ = 0; |
| this->offset_ = 0; |
| this->filesz_ = 0; |
| return; |
| } |
| |
| const Output_data* first; |
| if (this->output_data_.empty()) |
| first = this->output_bss_.front(); |
| else |
| first = this->output_data_.front(); |
| this->vaddr_ = first->address(); |
| this->paddr_ = this->vaddr_; |
| this->offset_ = first->offset(); |
| |
| if (this->output_data_.empty()) |
| this->filesz_ = 0; |
| else |
| { |
| const Output_data* last_data = this->output_data_.back(); |
| this->filesz_ = (last_data->address() |
| + last_data->data_size() |
| - this->vaddr_); |
| } |
| |
| const Output_data* last; |
| if (this->output_bss_.empty()) |
| last = this->output_data_.back(); |
| else |
| last = this->output_bss_.back(); |
| this->memsz_ = (last->address() |
| + last->data_size() |
| - this->vaddr_); |
| } |
| |
| // Return the number of Output_sections in an Output_segment. |
| |
| unsigned int |
| Output_segment::output_section_count() const |
| { |
| return (this->output_section_count_list(&this->output_data_) |
| + this->output_section_count_list(&this->output_bss_)); |
| } |
| |
| // Return the number of Output_sections in an Output_data_list. |
| |
| unsigned int |
| Output_segment::output_section_count_list(const Output_data_list* pdl) const |
| { |
| unsigned int count = 0; |
| for (Output_data_list::const_iterator p = pdl->begin(); |
| p != pdl->end(); |
| ++p) |
| { |
| if ((*p)->is_section()) |
| ++count; |
| } |
| return count; |
| } |
| |
| // Write the segment data into *OPHDR. |
| |
| template<int size, bool big_endian> |
| void |
| Output_segment::write_header(elfcpp::Phdr_write<size, big_endian>* ophdr) |
| { |
| ophdr->put_p_type(this->type_); |
| ophdr->put_p_offset(this->offset_); |
| ophdr->put_p_vaddr(this->vaddr_); |
| ophdr->put_p_paddr(this->paddr_); |
| ophdr->put_p_filesz(this->filesz_); |
| ophdr->put_p_memsz(this->memsz_); |
| ophdr->put_p_flags(this->flags_); |
| ophdr->put_p_align(this->addralign()); |
| } |
| |
| // Write the section headers into V. |
| |
| template<int size, bool big_endian> |
| unsigned char* |
| Output_segment::write_section_headers(const Layout* layout, |
| const Stringpool* secnamepool, |
| unsigned char* v, |
| unsigned int *pshndx |
| ACCEPT_SIZE_ENDIAN) const |
| { |
| // Every section that is attached to a segment must be attached to a |
| // PT_LOAD segment, so we only write out section headers for PT_LOAD |
| // segments. |
| if (this->type_ != elfcpp::PT_LOAD) |
| return v; |
| |
| v = this->write_section_headers_list |
| SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
| layout, secnamepool, &this->output_data_, v, pshndx |
| SELECT_SIZE_ENDIAN(size, big_endian)); |
| v = this->write_section_headers_list |
| SELECT_SIZE_ENDIAN_NAME(size, big_endian) ( |
| layout, secnamepool, &this->output_bss_, v, pshndx |
| SELECT_SIZE_ENDIAN(size, big_endian)); |
| return v; |
| } |
| |
| template<int size, bool big_endian> |
| unsigned char* |
| Output_segment::write_section_headers_list(const Layout* layout, |
| const Stringpool* secnamepool, |
| const Output_data_list* pdl, |
| unsigned char* v, |
| unsigned int* pshndx |
| ACCEPT_SIZE_ENDIAN) const |
| { |
| const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; |
| for (Output_data_list::const_iterator p = pdl->begin(); |
| p != pdl->end(); |
| ++p) |
| { |
| if ((*p)->is_section()) |
| { |
| const Output_section* ps = static_cast<const Output_section*>(*p); |
| gold_assert(*pshndx == ps->out_shndx()); |
| elfcpp::Shdr_write<size, big_endian> oshdr(v); |
| ps->write_header(layout, secnamepool, &oshdr); |
| v += shdr_size; |
| ++*pshndx; |
| } |
| } |
| return v; |
| } |
| |
| // Output_file methods. |
| |
| Output_file::Output_file(const General_options& options) |
| : options_(options), |
| name_(options.output_file_name()), |
| o_(-1), |
| file_size_(0), |
| base_(NULL) |
| { |
| } |
| |
| // Open the output file. |
| |
| void |
| Output_file::open(off_t file_size) |
| { |
| this->file_size_ = file_size; |
| |
| int mode = this->options_.is_relocatable() ? 0666 : 0777; |
| int o = ::open(this->name_, O_RDWR | O_CREAT | O_TRUNC, mode); |
| if (o < 0) |
| { |
| fprintf(stderr, _("%s: %s: open: %s\n"), |
| program_name, this->name_, strerror(errno)); |
| gold_exit(false); |
| } |
| this->o_ = o; |
| |
| // Write out one byte to make the file the right size. |
| if (::lseek(o, file_size - 1, SEEK_SET) < 0) |
| { |
| fprintf(stderr, _("%s: %s: lseek: %s\n"), |
| program_name, this->name_, strerror(errno)); |
| gold_exit(false); |
| } |
| char b = 0; |
| if (::write(o, &b, 1) != 1) |
| { |
| fprintf(stderr, _("%s: %s: write: %s\n"), |
| program_name, this->name_, strerror(errno)); |
| gold_exit(false); |
| } |
| |
| // Map the file into memory. |
| void* base = ::mmap(NULL, file_size, PROT_READ | PROT_WRITE, |
| MAP_SHARED, o, 0); |
| if (base == MAP_FAILED) |
| { |
| fprintf(stderr, _("%s: %s: mmap: %s\n"), |
| program_name, this->name_, strerror(errno)); |
| gold_exit(false); |
| } |
| this->base_ = static_cast<unsigned char*>(base); |
| } |
| |
| // Close the output file. |
| |
| void |
| Output_file::close() |
| { |
| if (::munmap(this->base_, this->file_size_) < 0) |
| { |
| fprintf(stderr, _("%s: %s: munmap: %s\n"), |
| program_name, this->name_, strerror(errno)); |
| gold_exit(false); |
| } |
| this->base_ = NULL; |
| |
| if (::close(this->o_) < 0) |
| { |
| fprintf(stderr, _("%s: %s: close: %s\n"), |
| program_name, this->name_, strerror(errno)); |
| gold_exit(false); |
| } |
| this->o_ = -1; |
| } |
| |
| // Instantiate the templates we need. We could use the configure |
| // script to restrict this to only the ones for implemented targets. |
| |
| template |
| off_t |
| Output_section::add_input_section<32, false>( |
| Relobj* object, |
| unsigned int shndx, |
| const char* secname, |
| const elfcpp::Shdr<32, false>& shdr); |
| |
| template |
| off_t |
| Output_section::add_input_section<32, true>( |
| Relobj* object, |
| unsigned int shndx, |
| const char* secname, |
| const elfcpp::Shdr<32, true>& shdr); |
| |
| template |
| off_t |
| Output_section::add_input_section<64, false>( |
| Relobj* object, |
| unsigned int shndx, |
| const char* secname, |
| const elfcpp::Shdr<64, false>& shdr); |
| |
| template |
| off_t |
| Output_section::add_input_section<64, true>( |
| Relobj* object, |
| unsigned int shndx, |
| const char* secname, |
| const elfcpp::Shdr<64, true>& shdr); |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, false, 32, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, false, 32, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, false, 64, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, false, 64, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, true, 32, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, true, 32, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, true, 64, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_REL, true, 64, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, false, 32, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, false, 32, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, false, 64, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, false, 64, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, true, 32, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, true, 32, true>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, true, 64, false>; |
| |
| template |
| class Output_data_reloc<elfcpp::SHT_RELA, true, 64, true>; |
| |
| template |
| class Output_data_got<32, false>; |
| |
| template |
| class Output_data_got<32, true>; |
| |
| template |
| class Output_data_got<64, false>; |
| |
| template |
| class Output_data_got<64, true>; |
| |
| } // End namespace gold. |