365 lines
10 KiB
C++
365 lines
10 KiB
C++
// binary.cc -- binary input files for gold
|
|
|
|
// Copyright (C) 2008-2015 Free Software Foundation, Inc.
|
|
// Written by Ian Lance Taylor <iant@google.com>.
|
|
|
|
// This file is part of gold.
|
|
|
|
// This program is free software; you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation; either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
|
// MA 02110-1301, USA.
|
|
|
|
#include "gold.h"
|
|
|
|
#include <cerrno>
|
|
#include <cstring>
|
|
#include "safe-ctype.h"
|
|
|
|
#include "elfcpp.h"
|
|
#include "stringpool.h"
|
|
#include "fileread.h"
|
|
#include "output.h"
|
|
#include "binary.h"
|
|
|
|
// Support for reading binary files as input. These become blobs in
|
|
// the final output. These files are treated as though they have a
|
|
// single .data section and define three symbols:
|
|
// _binary_FILENAME_start, _binary_FILENAME_end, _binary_FILENAME_size.
|
|
// The FILENAME is the name of the input file, with any
|
|
// non-alphanumeric character changed to an underscore.
|
|
|
|
// We implement this by creating an ELF file in memory.
|
|
|
|
namespace gold
|
|
{
|
|
|
|
// class Binary_to_elf.
|
|
|
|
Binary_to_elf::Binary_to_elf(elfcpp::EM machine, int size, bool big_endian,
|
|
const std::string& filename)
|
|
: elf_machine_(machine), size_(size), big_endian_(big_endian),
|
|
filename_(filename), data_(NULL), filesize_(0)
|
|
{
|
|
}
|
|
|
|
Binary_to_elf::~Binary_to_elf()
|
|
{
|
|
if (this->data_ != NULL)
|
|
delete[] this->data_;
|
|
}
|
|
|
|
// Given FILENAME, create a buffer which looks like an ELF file with
|
|
// the contents of FILENAME as the contents of the only section. The
|
|
// TASK parameters is mainly for debugging, and records who holds
|
|
// locks.
|
|
|
|
bool
|
|
Binary_to_elf::convert(const Task* task)
|
|
{
|
|
if (this->size_ == 32)
|
|
{
|
|
if (!this->big_endian_)
|
|
{
|
|
#ifdef HAVE_TARGET_32_LITTLE
|
|
return this->sized_convert<32, false>(task);
|
|
#else
|
|
gold_unreachable();
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
#ifdef HAVE_TARGET_32_BIG
|
|
return this->sized_convert<32, true>(task);
|
|
#else
|
|
gold_unreachable();
|
|
#endif
|
|
}
|
|
}
|
|
else if (this->size_ == 64)
|
|
{
|
|
if (!this->big_endian_)
|
|
{
|
|
#ifdef HAVE_TARGET_64_LITTLE
|
|
return this->sized_convert<64, false>(task);
|
|
#else
|
|
gold_unreachable();
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
#ifdef HAVE_TARGET_64_BIG
|
|
return this->sized_convert<64, true>(task);
|
|
#else
|
|
gold_unreachable();
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
gold_unreachable();
|
|
}
|
|
|
|
// We are going to create:
|
|
// * The ELF file header.
|
|
// * Five sections: null section, .data, .symtab, .strtab, .shstrtab
|
|
// * The contents of the file.
|
|
// * Four symbols: null, begin, end, size.
|
|
// * Three symbol names.
|
|
// * Four section names.
|
|
|
|
template<int size, bool big_endian>
|
|
bool
|
|
Binary_to_elf::sized_convert(const Task* task)
|
|
{
|
|
// Read the input file.
|
|
|
|
File_read f;
|
|
if (!f.open(task, this->filename_))
|
|
{
|
|
gold_error(_("cannot open %s: %s:"), this->filename_.c_str(),
|
|
strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
section_size_type filesize = convert_to_section_size_type(f.filesize());
|
|
const unsigned char* fileview;
|
|
if (filesize == 0)
|
|
fileview = NULL;
|
|
else
|
|
fileview = f.get_view(0, 0, filesize, false, false);
|
|
|
|
unsigned int align;
|
|
if (size == 32)
|
|
align = 4;
|
|
else if (size == 64)
|
|
align = 8;
|
|
else
|
|
gold_unreachable();
|
|
section_size_type aligned_filesize = align_address(filesize, align);
|
|
|
|
// Build the stringpool for the symbol table.
|
|
|
|
std::string mangled_name = this->filename_;
|
|
for (std::string::iterator p = mangled_name.begin();
|
|
p != mangled_name.end();
|
|
++p)
|
|
if (!ISALNUM(*p))
|
|
*p = '_';
|
|
mangled_name = "_binary_" + mangled_name;
|
|
std::string start_symbol_name = mangled_name + "_start";
|
|
std::string end_symbol_name = mangled_name + "_end";
|
|
std::string size_symbol_name = mangled_name + "_size";
|
|
|
|
Stringpool strtab;
|
|
strtab.add(start_symbol_name.c_str(), false, NULL);
|
|
strtab.add(end_symbol_name.c_str(), false, NULL);
|
|
strtab.add(size_symbol_name.c_str(), false, NULL);
|
|
strtab.set_string_offsets();
|
|
|
|
// Build the stringpool for the section name table.
|
|
|
|
Stringpool shstrtab;
|
|
shstrtab.add(".data", false, NULL);
|
|
shstrtab.add(".symtab", false, NULL);
|
|
shstrtab.add(".strtab", false, NULL);
|
|
shstrtab.add(".shstrtab", false, NULL);
|
|
shstrtab.set_string_offsets();
|
|
|
|
// Work out the size of the generated file, and the offsets of the
|
|
// various sections, and allocate a buffer.
|
|
|
|
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
|
|
|
|
size_t output_size = (elfcpp::Elf_sizes<size>::ehdr_size
|
|
+ 5 * elfcpp::Elf_sizes<size>::shdr_size);
|
|
size_t data_offset = output_size;
|
|
output_size += aligned_filesize;
|
|
size_t symtab_offset = output_size;
|
|
output_size += 4 * sym_size;
|
|
size_t strtab_offset = output_size;
|
|
output_size += strtab.get_strtab_size();
|
|
size_t shstrtab_offset = output_size;
|
|
output_size += shstrtab.get_strtab_size();
|
|
|
|
unsigned char* buffer = new unsigned char[output_size];
|
|
|
|
// Write out the data.
|
|
|
|
unsigned char* pout = buffer;
|
|
|
|
this->write_file_header<size, big_endian>(&pout);
|
|
|
|
this->write_section_header<size, big_endian>("", &shstrtab, elfcpp::SHT_NULL,
|
|
0, 0, 0, 0, 0,
|
|
0, 0, &pout);
|
|
// Having the section be named ".data", having it be writable, and
|
|
// giving it an alignment of 1 is because the GNU linker does it
|
|
// that way, and existing linker script expect it.
|
|
this->write_section_header<size, big_endian>(".data", &shstrtab,
|
|
elfcpp::SHT_PROGBITS,
|
|
(elfcpp::SHF_ALLOC
|
|
| elfcpp::SHF_WRITE),
|
|
data_offset,
|
|
filesize, 0, 0,
|
|
1, 0, &pout);
|
|
this->write_section_header<size, big_endian>(".symtab", &shstrtab,
|
|
elfcpp::SHT_SYMTAB,
|
|
0, symtab_offset, 4 * sym_size,
|
|
3, 1, align, sym_size, &pout);
|
|
this->write_section_header<size, big_endian>(".strtab", &shstrtab,
|
|
elfcpp::SHT_STRTAB,
|
|
0, strtab_offset,
|
|
strtab.get_strtab_size(),
|
|
0, 0, 1, 0, &pout);
|
|
this->write_section_header<size, big_endian>(".shstrtab", &shstrtab,
|
|
elfcpp::SHT_STRTAB,
|
|
0, shstrtab_offset,
|
|
shstrtab.get_strtab_size(),
|
|
0, 0, 1, 0, &pout);
|
|
|
|
if (filesize > 0)
|
|
{
|
|
memcpy(pout, fileview, filesize);
|
|
pout += filesize;
|
|
memset(pout, 0, aligned_filesize - filesize);
|
|
pout += aligned_filesize - filesize;
|
|
}
|
|
|
|
this->write_symbol<size, big_endian>("", &strtab, 0, 0, 0, &pout);
|
|
this->write_symbol<size, big_endian>(start_symbol_name, &strtab, 0, filesize,
|
|
1, &pout);
|
|
this->write_symbol<size, big_endian>(end_symbol_name, &strtab, filesize, 0,
|
|
1, &pout);
|
|
this->write_symbol<size, big_endian>(size_symbol_name, &strtab, filesize, 0,
|
|
elfcpp::SHN_ABS, &pout);
|
|
|
|
strtab.write_to_buffer(pout, strtab.get_strtab_size());
|
|
pout += strtab.get_strtab_size();
|
|
|
|
shstrtab.write_to_buffer(pout, shstrtab.get_strtab_size());
|
|
pout += shstrtab.get_strtab_size();
|
|
|
|
gold_assert(static_cast<size_t>(pout - buffer) == output_size);
|
|
|
|
this->data_ = buffer;
|
|
this->filesize_ = output_size;
|
|
|
|
f.unlock(task);
|
|
|
|
return true;
|
|
}
|
|
|
|
// Write out the file header.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Binary_to_elf::write_file_header(unsigned char** ppout)
|
|
{
|
|
elfcpp::Ehdr_write<size, big_endian> oehdr(*ppout);
|
|
|
|
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;
|
|
oehdr.put_e_ident(e_ident);
|
|
|
|
oehdr.put_e_type(elfcpp::ET_REL);
|
|
oehdr.put_e_machine(this->elf_machine_);
|
|
oehdr.put_e_version(elfcpp::EV_CURRENT);
|
|
oehdr.put_e_entry(0);
|
|
oehdr.put_e_phoff(0);
|
|
oehdr.put_e_shoff(elfcpp::Elf_sizes<size>::ehdr_size);
|
|
oehdr.put_e_flags(0);
|
|
oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
|
|
oehdr.put_e_phentsize(0);
|
|
oehdr.put_e_phnum(0);
|
|
oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
|
|
oehdr.put_e_shnum(5);
|
|
oehdr.put_e_shstrndx(4);
|
|
|
|
*ppout += elfcpp::Elf_sizes<size>::ehdr_size;
|
|
}
|
|
|
|
// Write out a section header.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Binary_to_elf::write_section_header(
|
|
const char* name,
|
|
const Stringpool* shstrtab,
|
|
elfcpp::SHT type,
|
|
unsigned int flags,
|
|
section_size_type offset,
|
|
section_size_type section_size,
|
|
unsigned int link,
|
|
unsigned int info,
|
|
unsigned int addralign,
|
|
unsigned int entsize,
|
|
unsigned char** ppout)
|
|
{
|
|
elfcpp::Shdr_write<size, big_endian> oshdr(*ppout);
|
|
|
|
oshdr.put_sh_name(*name == '\0' ? 0 : shstrtab->get_offset(name));
|
|
oshdr.put_sh_type(type);
|
|
oshdr.put_sh_flags(flags);
|
|
oshdr.put_sh_addr(0);
|
|
oshdr.put_sh_offset(offset);
|
|
oshdr.put_sh_size(section_size);
|
|
oshdr.put_sh_link(link);
|
|
oshdr.put_sh_info(info);
|
|
oshdr.put_sh_addralign(addralign);
|
|
oshdr.put_sh_entsize(entsize);
|
|
|
|
*ppout += elfcpp::Elf_sizes<size>::shdr_size;
|
|
}
|
|
|
|
// Write out a symbol.
|
|
|
|
template<int size, bool big_endian>
|
|
void
|
|
Binary_to_elf::write_symbol(
|
|
const std::string& name,
|
|
const Stringpool* strtab,
|
|
section_size_type value,
|
|
typename elfcpp::Elf_types<32>::Elf_WXword st_size,
|
|
unsigned int shndx,
|
|
unsigned char** ppout)
|
|
{
|
|
unsigned char* pout = *ppout;
|
|
|
|
elfcpp::Sym_write<size, big_endian> osym(pout);
|
|
osym.put_st_name(name.empty() ? 0 : strtab->get_offset(name.c_str()));
|
|
osym.put_st_value(value);
|
|
osym.put_st_size(st_size);
|
|
osym.put_st_info(name.empty() ? elfcpp::STB_LOCAL : elfcpp::STB_GLOBAL,
|
|
elfcpp::STT_NOTYPE);
|
|
osym.put_st_other(elfcpp::STV_DEFAULT, 0);
|
|
osym.put_st_shndx(shndx);
|
|
|
|
*ppout += elfcpp::Elf_sizes<size>::sym_size;
|
|
}
|
|
|
|
} // End namespace gold.
|