mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-03 04:12:10 +08:00
1140 lines
28 KiB
C++
1140 lines
28 KiB
C++
// output.cc -- manage the output file for gold
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#include "gold.h"
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#include <cstdlib>
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#include <cerrno>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <algorithm>
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#include "object.h"
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#include "symtab.h"
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#include "reloc.h"
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#include "output.h"
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namespace gold
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{
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// Output_data methods.
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Output_data::~Output_data()
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{
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}
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// Set the address and offset.
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void
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Output_data::set_address(uint64_t addr, off_t off)
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{
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this->address_ = addr;
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this->offset_ = off;
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// Let the child class know.
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this->do_set_address(addr, off);
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}
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// Return the default alignment for a size--32 or 64.
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uint64_t
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Output_data::default_alignment(int size)
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{
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if (size == 32)
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return 4;
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else if (size == 64)
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return 8;
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else
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abort();
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}
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// Output_data_const methods.
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void
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Output_data_const::do_write(Output_file* output)
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{
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output->write(this->offset(), data_.data(), data_.size());
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}
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// Output_section_header methods. This currently assumes that the
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// segment and section lists are complete at construction time.
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Output_section_headers::Output_section_headers(
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int size,
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bool big_endian,
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const Layout::Segment_list& segment_list,
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const Layout::Section_list& section_list,
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const Stringpool* secnamepool)
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: size_(size),
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big_endian_(big_endian),
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segment_list_(segment_list),
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section_list_(section_list),
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secnamepool_(secnamepool)
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{
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// Count all the sections. Start with 1 for the null section.
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off_t count = 1;
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for (Layout::Segment_list::const_iterator p = segment_list.begin();
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p != segment_list.end();
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++p)
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if ((*p)->type() == elfcpp::PT_LOAD)
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count += (*p)->output_section_count();
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count += section_list.size();
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int shdr_size;
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if (size == 32)
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shdr_size = elfcpp::Elf_sizes<32>::shdr_size;
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else if (size == 64)
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shdr_size = elfcpp::Elf_sizes<64>::shdr_size;
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else
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abort();
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this->set_data_size(count * shdr_size);
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}
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// Write out the section headers.
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void
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Output_section_headers::do_write(Output_file* of)
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{
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if (this->size_ == 32)
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{
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if (this->big_endian_)
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this->do_sized_write<32, true>(of);
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else
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this->do_sized_write<32, false>(of);
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}
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else if (this->size_ == 64)
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{
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if (this->big_endian_)
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this->do_sized_write<64, true>(of);
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else
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this->do_sized_write<64, false>(of);
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}
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else
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abort();
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}
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template<int size, bool big_endian>
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void
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Output_section_headers::do_sized_write(Output_file* of)
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{
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off_t all_shdrs_size = this->data_size();
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unsigned char* view = of->get_output_view(this->offset(), all_shdrs_size);
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const int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
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unsigned char* v = view;
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{
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typename elfcpp::Shdr_write<size, big_endian> oshdr(v);
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oshdr.put_sh_name(0);
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oshdr.put_sh_type(elfcpp::SHT_NULL);
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oshdr.put_sh_flags(0);
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oshdr.put_sh_addr(0);
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oshdr.put_sh_offset(0);
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oshdr.put_sh_size(0);
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oshdr.put_sh_link(0);
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oshdr.put_sh_info(0);
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oshdr.put_sh_addralign(0);
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oshdr.put_sh_entsize(0);
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}
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v += shdr_size;
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unsigned shndx = 1;
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for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
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p != this->segment_list_.end();
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++p)
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v = (*p)->write_section_headers SELECT_SIZE_ENDIAN_NAME(size, big_endian) (
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this->secnamepool_, v, &shndx
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SELECT_SIZE_ENDIAN(size, big_endian));
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for (Layout::Section_list::const_iterator p = this->section_list_.begin();
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p != this->section_list_.end();
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++p)
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{
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assert(shndx == (*p)->out_shndx());
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elfcpp::Shdr_write<size, big_endian> oshdr(v);
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(*p)->write_header(this->secnamepool_, &oshdr);
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v += shdr_size;
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++shndx;
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}
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of->write_output_view(this->offset(), all_shdrs_size, view);
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}
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// Output_segment_header methods.
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Output_segment_headers::Output_segment_headers(
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int size,
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bool big_endian,
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const Layout::Segment_list& segment_list)
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: size_(size), big_endian_(big_endian), segment_list_(segment_list)
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{
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int phdr_size;
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if (size == 32)
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phdr_size = elfcpp::Elf_sizes<32>::phdr_size;
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else if (size == 64)
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phdr_size = elfcpp::Elf_sizes<64>::phdr_size;
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else
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abort();
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this->set_data_size(segment_list.size() * phdr_size);
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}
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void
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Output_segment_headers::do_write(Output_file* of)
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{
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if (this->size_ == 32)
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{
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if (this->big_endian_)
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this->do_sized_write<32, true>(of);
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else
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this->do_sized_write<32, false>(of);
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}
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else if (this->size_ == 64)
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{
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if (this->big_endian_)
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this->do_sized_write<64, true>(of);
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else
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this->do_sized_write<64, false>(of);
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}
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else
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abort();
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}
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template<int size, bool big_endian>
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void
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Output_segment_headers::do_sized_write(Output_file* of)
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{
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const int phdr_size = elfcpp::Elf_sizes<size>::phdr_size;
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off_t all_phdrs_size = this->segment_list_.size() * phdr_size;
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unsigned char* view = of->get_output_view(this->offset(),
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all_phdrs_size);
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unsigned char* v = view;
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for (Layout::Segment_list::const_iterator p = this->segment_list_.begin();
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p != this->segment_list_.end();
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++p)
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{
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elfcpp::Phdr_write<size, big_endian> ophdr(v);
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(*p)->write_header(&ophdr);
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v += phdr_size;
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}
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of->write_output_view(this->offset(), all_phdrs_size, view);
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}
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// Output_file_header methods.
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Output_file_header::Output_file_header(int size,
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bool big_endian,
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const General_options& options,
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const Target* target,
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const Symbol_table* symtab,
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const Output_segment_headers* osh)
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: size_(size),
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big_endian_(big_endian),
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options_(options),
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target_(target),
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symtab_(symtab),
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segment_header_(osh),
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section_header_(NULL),
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shstrtab_(NULL)
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{
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int ehdr_size;
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if (size == 32)
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ehdr_size = elfcpp::Elf_sizes<32>::ehdr_size;
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else if (size == 64)
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ehdr_size = elfcpp::Elf_sizes<64>::ehdr_size;
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else
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abort();
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this->set_data_size(ehdr_size);
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}
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// Set the section table information for a file header.
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void
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Output_file_header::set_section_info(const Output_section_headers* shdrs,
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const Output_section* shstrtab)
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{
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this->section_header_ = shdrs;
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this->shstrtab_ = shstrtab;
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}
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// Write out the file header.
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void
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Output_file_header::do_write(Output_file* of)
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{
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if (this->size_ == 32)
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{
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if (this->big_endian_)
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this->do_sized_write<32, true>(of);
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else
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this->do_sized_write<32, false>(of);
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}
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else if (this->size_ == 64)
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{
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if (this->big_endian_)
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this->do_sized_write<64, true>(of);
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else
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this->do_sized_write<64, false>(of);
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}
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else
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abort();
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}
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// Write out the file header with appropriate size and endianess.
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template<int size, bool big_endian>
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void
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Output_file_header::do_sized_write(Output_file* of)
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{
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assert(this->offset() == 0);
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int ehdr_size = elfcpp::Elf_sizes<size>::ehdr_size;
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unsigned char* view = of->get_output_view(0, ehdr_size);
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elfcpp::Ehdr_write<size, big_endian> oehdr(view);
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unsigned char e_ident[elfcpp::EI_NIDENT];
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memset(e_ident, 0, elfcpp::EI_NIDENT);
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e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
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e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
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e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
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e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
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if (size == 32)
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e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
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else if (size == 64)
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e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
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else
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abort();
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e_ident[elfcpp::EI_DATA] = (big_endian
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? elfcpp::ELFDATA2MSB
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: elfcpp::ELFDATA2LSB);
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e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
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// FIXME: Some targets may need to set EI_OSABI and EI_ABIVERSION.
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oehdr.put_e_ident(e_ident);
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elfcpp::ET e_type;
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// FIXME: ET_DYN.
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if (this->options_.is_relocatable())
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e_type = elfcpp::ET_REL;
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else
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e_type = elfcpp::ET_EXEC;
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oehdr.put_e_type(e_type);
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oehdr.put_e_machine(this->target_->machine_code());
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oehdr.put_e_version(elfcpp::EV_CURRENT);
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// FIXME: Need to support -e, and target specific entry symbol.
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Symbol* sym = this->symtab_->lookup("_start");
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typename Sized_symbol<size>::Value_type v;
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if (sym == NULL)
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v = 0;
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else
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{
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Sized_symbol<size>* ssym;
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ssym = this->symtab_->get_sized_symbol SELECT_SIZE_NAME(size) (
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sym SELECT_SIZE(size));
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v = ssym->value();
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}
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oehdr.put_e_entry(v);
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oehdr.put_e_phoff(this->segment_header_->offset());
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oehdr.put_e_shoff(this->section_header_->offset());
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// FIXME: The target needs to set the flags.
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oehdr.put_e_flags(0);
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oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
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oehdr.put_e_phentsize(elfcpp::Elf_sizes<size>::phdr_size);
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oehdr.put_e_phnum(this->segment_header_->data_size()
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/ elfcpp::Elf_sizes<size>::phdr_size);
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oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
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oehdr.put_e_shnum(this->section_header_->data_size()
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/ elfcpp::Elf_sizes<size>::shdr_size);
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oehdr.put_e_shstrndx(this->shstrtab_->out_shndx());
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of->write_output_view(0, ehdr_size, view);
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}
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// Output_section_got::Got_entry methods.
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// Write out the entry.
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template<int size, bool big_endian>
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void
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Output_section_got<size, big_endian>::Got_entry::write(unsigned char* pov)
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const
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{
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Valtype val = 0;
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switch (this->local_sym_index_)
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{
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case GSYM_CODE:
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{
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Symbol* gsym = this->u_.gsym;
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// If the symbol is resolved locally, we need to write out its
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// value. Otherwise we just write zero. The target code is
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// responsible for creating a relocation entry to fill in the
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// value at runtime.
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if (gsym->is_resolved_locally())
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{
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Sized_symbol<size>* sgsym;
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// This cast is a bit ugly. We don't want to put a
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// virtual method in Symbol, because we want Symbol to be
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// as small as possible.
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sgsym = static_cast<Sized_symbol<size>*>(gsym);
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val = sgsym->value();
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}
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}
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break;
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case CONSTANT_CODE:
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val = this->u_.constant;
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break;
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default:
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abort();
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}
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Valtype* povv = reinterpret_cast<Valtype*>(pov);
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elfcpp::Swap<size, big_endian>::writeval(povv, val);
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}
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// Output_section_data methods.
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unsigned int
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Output_section_data::do_out_shndx() const
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{
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assert(this->output_section_ != NULL);
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return this->output_section_->out_shndx();
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}
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// Output_section_got methods.
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// Write out the GOT.
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template<int size, bool big_endian>
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void
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Output_section_got<size, big_endian>::do_write(Output_file* of)
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{
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const int add = size / 8;
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const off_t off = this->offset();
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const off_t oview_size = this->entries_.size() * add;
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unsigned char* const oview = of->get_output_view(off, oview_size);
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unsigned char* pov = oview;
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for (typename Got_entries::const_iterator p = this->entries_.begin();
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p != this->entries_.end();
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++p)
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{
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p->write(pov);
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pov += add;
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}
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of->write_output_view(off, oview_size, oview);
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// We no longer need the GOT entries.
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this->entries_.clear();
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}
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// Output_section::Input_section methods.
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// Return the data size. For an input section we store the size here.
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// For an Output_section_data, we have to ask it for the size.
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off_t
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Output_section::Input_section::data_size() const
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{
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if (this->is_input_section())
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return this->data_size_;
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else
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return this->u_.posd->data_size();
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}
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// Set the address and file offset.
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void
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Output_section::Input_section::set_address(uint64_t addr, off_t off,
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off_t secoff)
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{
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if (this->is_input_section())
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this->u_.object->set_section_offset(this->shndx_, off - secoff);
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else
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this->u_.posd->set_address(addr, off);
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}
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// Write out the data. We don't have to do anything for an input
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// section--they are handled via Object::relocate--but this is where
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// we write out the data for an Output_section_data.
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void
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Output_section::Input_section::write(Output_file* of)
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{
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if (!this->is_input_section())
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this->u_.posd->write(of);
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}
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// Output_section methods.
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// Construct an Output_section. NAME will point into a Stringpool.
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Output_section::Output_section(const char* name, elfcpp::Elf_Word type,
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elfcpp::Elf_Xword flags, bool may_add_data)
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: name_(name),
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addralign_(0),
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entsize_(0),
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link_(0),
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info_(0),
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type_(type),
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flags_(flags),
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out_shndx_(0),
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input_sections_(),
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first_input_offset_(0),
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may_add_data_(may_add_data)
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{
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}
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Output_section::~Output_section()
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{
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}
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// Add the input section SHNDX, with header SHDR, named SECNAME, in
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// OBJECT, to the Output_section. Return the offset of the input
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// section within the output section. We don't always keep track of
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// input sections for an Output_section. Instead, each Object keeps
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// track of the Output_section for each of its input sections.
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template<int size, bool big_endian>
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off_t
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Output_section::add_input_section(Relobj* object, unsigned int shndx,
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const char* secname,
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const elfcpp::Shdr<size, big_endian>& shdr)
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{
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assert(this->may_add_data_);
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elfcpp::Elf_Xword addralign = shdr.get_sh_addralign();
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if ((addralign & (addralign - 1)) != 0)
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{
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fprintf(stderr, _("%s: %s: invalid alignment %lu for section \"%s\"\n"),
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program_name, object->name().c_str(),
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static_cast<unsigned long>(addralign), secname);
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gold_exit(false);
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}
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|
|
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)
|
|
{
|
|
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 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());
|
|
oshdr->put_sh_link(this->link_);
|
|
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_section_symtab methods.
|
|
|
|
Output_section_symtab::Output_section_symtab(const char* name, off_t size)
|
|
: Output_section(name, elfcpp::SHT_SYMTAB, 0, false)
|
|
{
|
|
this->set_data_size(size);
|
|
}
|
|
|
|
// Output_section_strtab methods.
|
|
|
|
Output_section_strtab::Output_section_strtab(const char* name,
|
|
Stringpool* contents)
|
|
: Output_section(name, elfcpp::SHT_STRTAB, 0, false),
|
|
contents_(contents)
|
|
{
|
|
this->set_data_size(contents->get_strtab_size());
|
|
}
|
|
|
|
void
|
|
Output_section_strtab::do_write(Output_file* of)
|
|
{
|
|
this->contents_->write(of, this->offset());
|
|
}
|
|
|
|
// 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)
|
|
{
|
|
assert((os->flags() & elfcpp::SHF_ALLOC) != 0);
|
|
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())
|
|
{
|
|
Layout::Data_list::iterator p = pdl->end();
|
|
do
|
|
{
|
|
--p;
|
|
if ((*p)->is_section_type(elfcpp::SHT_NOTE))
|
|
{
|
|
++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;
|
|
Layout::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)
|
|
{
|
|
++p;
|
|
pdl->insert(p, os);
|
|
return;
|
|
}
|
|
}
|
|
while (p != pdl->begin());
|
|
|
|
// There are no TLS sections yet; put this one at the end of the
|
|
// section list.
|
|
}
|
|
|
|
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)
|
|
{
|
|
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)
|
|
{
|
|
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()
|
|
{
|
|
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 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) (
|
|
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) (
|
|
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 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);
|
|
assert(*pshndx == ps->out_shndx());
|
|
elfcpp::Shdr_write<size, big_endian> oshdr(v);
|
|
ps->write_header(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
|
|
void
|
|
Output_section_got<32, false>::do_write(Output_file* of);
|
|
|
|
template
|
|
void
|
|
Output_section_got<32, true>::do_write(Output_file* of);
|
|
|
|
template
|
|
void
|
|
Output_section_got<64, false>::do_write(Output_file* of);
|
|
|
|
template
|
|
void
|
|
Output_section_got<64, true>::do_write(Output_file* of);
|
|
|
|
} // End namespace gold.
|