[binutils.git] / gold / binary.cc

// binary.cc -- binary input files for gold

// Copyright (C) 2008-2014 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <[email protected]>.

// 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, &pout);
  this->write_symbol<size, big_endian>(start_symbol_name, &strtab, 0, 1,
				       &pout);
  this->write_symbol<size, big_endian>(end_symbol_name, &strtab, filesize, 1,
				       &pout);
  this->write_symbol<size, big_endian>(size_symbol_name, &strtab, filesize,
				       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,
    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(0);
  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.
Commit	Line	Data
bc644c6c ILT	1	// binary.cc -- binary input files for gold
bc644c6c ILT	2
4b95cf5c	3	// Copyright (C) 2008-2014 Free Software Foundation, Inc.
bc644c6c ILT	4	// Written by Ian Lance Taylor <[email protected]>.
	5
	6	// This file is part of gold.
	7
	8	// This program is free software; you can redistribute it and/or modify
	9	// it under the terms of the GNU General Public License as published by
	10	// the Free Software Foundation; either version 3 of the License, or
	11	// (at your option) any later version.
	12
	13	// This program is distributed in the hope that it will be useful,
	14	// but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	// GNU General Public License for more details.
	17
	18	// You should have received a copy of the GNU General Public License
	19	// along with this program; if not, write to the Free Software
	20	// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	21	// MA 02110-1301, USA.
	22
	23	#include "gold.h"
	24
	25	#include <cerrno>
	26	#include <cstring>
	27	#include "safe-ctype.h"
	28
	29	#include "elfcpp.h"
	30	#include "stringpool.h"
	31	#include "fileread.h"
	32	#include "output.h"
	33	#include "binary.h"
	34
	35	// Support for reading binary files as input. These become blobs in
	36	// the final output. These files are treated as though they have a
	37	// single .data section and define three symbols:
602b464e	38	// _binary_FILENAME_start, _binary_FILENAME_end, _binary_FILENAME_size.
bc644c6c ILT	39	// The FILENAME is the name of the input file, with any
	40	// non-alphanumeric character changed to an underscore.
	41
	42	// We implement this by creating an ELF file in memory.
	43
	44	namespace gold
	45	{
	46
	47	// class Binary_to_elf.
	48
	49	Binary_to_elf::Binary_to_elf(elfcpp::EM machine, int size, bool big_endian,
	50	const std::string& filename)
	51	: elf_machine_(machine), size_(size), big_endian_(big_endian),
	52	filename_(filename), data_(NULL), filesize_(0)
	53	{
	54	}
	55
	56	Binary_to_elf::~Binary_to_elf()
	57	{
	58	if (this->data_ != NULL)
	59	delete[] this->data_;
	60	}
	61
	62	// Given FILENAME, create a buffer which looks like an ELF file with
	63	// the contents of FILENAME as the contents of the only section. The
	64	// TASK parameters is mainly for debugging, and records who holds
	65	// locks.
	66
	67	bool
	68	Binary_to_elf::convert(const Task* task)
	69	{
	70	if (this->size_ == 32)
	71	{
	72	if (!this->big_endian_)
	73	{
	74	#ifdef HAVE_TARGET_32_LITTLE
	75	return this->sized_convert<32, false>(task);
	76	#else
	77	gold_unreachable();
	78	#endif
	79	}
	80	else
	81	{
	82	#ifdef HAVE_TARGET_32_BIG
	83	return this->sized_convert<32, true>(task);
	84	#else
	85	gold_unreachable();
	86	#endif
	87	}
	88	}
	89	else if (this->size_ == 64)
	90	{
	91	if (!this->big_endian_)
	92	{
	93	#ifdef HAVE_TARGET_64_LITTLE
	94	return this->sized_convert<64, false>(task);
	95	#else
	96	gold_unreachable();
	97	#endif
	98	}
	99	else
	100	{
	101	#ifdef HAVE_TARGET_64_BIG
	102	return this->sized_convert<64, true>(task);
103	#else
104	gold_unreachable();
105	#endif
106	}
107	}
108	else
109	gold_unreachable();
110	}
111
112	// We are going to create:
113	// * The ELF file header.
114	// * Five sections: null section, .data, .symtab, .strtab, .shstrtab
115	// * The contents of the file.
116	// * Four symbols: null, begin, end, size.
117	// * Three symbol names.
118	// * Four section names.
119
120	template<int size, bool big_endian>
121	bool
122	Binary_to_elf::sized_convert(const Task* task)
123	{
124	// Read the input file.
125
126	File_read f;
127	if (!f.open(task, this->filename_))
128	{
129	gold_error(_("cannot open %s: %s:"), this->filename_.c_str(),
130	strerror(errno));
131	return false;
132	}
133
134	section_size_type filesize = convert_to_section_size_type(f.filesize());
69d53f7a ILT	135	const unsigned char* fileview;
	136	if (filesize == 0)
	137	fileview = NULL;
	138	else
	139	fileview = f.get_view(0, 0, filesize, false, false);
bc644c6c ILT	140
	141	unsigned int align;
	142	if (size == 32)
	143	align = 4;
	144	else if (size == 64)
	145	align = 8;
	146	else
	147	gold_unreachable();
	148	section_size_type aligned_filesize = align_address(filesize, align);
	149
	150	// Build the stringpool for the symbol table.
	151
	152	std::string mangled_name = this->filename_;
	153	for (std::string::iterator p = mangled_name.begin();
	154	p != mangled_name.end();
	155	++p)
	156	if (!ISALNUM(*p))
	157	*p = '_';
	158	mangled_name = "_binary_" + mangled_name;
	159	std::string start_symbol_name = mangled_name + "_start";
	160	std::string end_symbol_name = mangled_name + "_end";
	161	std::string size_symbol_name = mangled_name + "_size";
	162
	163	Stringpool strtab;
	164	strtab.add(start_symbol_name.c_str(), false, NULL);
	165	strtab.add(end_symbol_name.c_str(), false, NULL);
	166	strtab.add(size_symbol_name.c_str(), false, NULL);
	167	strtab.set_string_offsets();
	168
	169	// Build the stringpool for the section name table.
	170
	171	Stringpool shstrtab;
	172	shstrtab.add(".data", false, NULL);
	173	shstrtab.add(".symtab", false, NULL);
	174	shstrtab.add(".strtab", false, NULL);
	175	shstrtab.add(".shstrtab", false, NULL);
	176	shstrtab.set_string_offsets();
	177
	178	// Work out the size of the generated file, and the offsets of the
	179	// various sections, and allocate a buffer.
	180
	181	const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
	182
	183	size_t output_size = (elfcpp::Elf_sizes<size>::ehdr_size
	184	+ 5 * elfcpp::Elf_sizes<size>::shdr_size);
	185	size_t data_offset = output_size;
	186	output_size += aligned_filesize;
	187	size_t symtab_offset = output_size;
	188	output_size += 4 * sym_size;
	189	size_t strtab_offset = output_size;
	190	output_size += strtab.get_strtab_size();
	191	size_t shstrtab_offset = output_size;
	192	output_size += shstrtab.get_strtab_size();
	193
	194	unsigned char* buffer = new unsigned char[output_size];
	195
	196	// Write out the data.
	197
	198	unsigned char* pout = buffer;
	199
	200	this->write_file_header<size, big_endian>(&pout);
	201
	202	this->write_section_header<size, big_endian>("", &shstrtab, elfcpp::SHT_NULL,
	203	0, 0, 0, 0, 0,
204	0, 0, &pout);
f0b886e3 ILT	205	// Having the section be named ".data", having it be writable, and
	206	// giving it an alignment of 1 is because the GNU linker does it
	207	// that way, and existing linker script expect it.
bc644c6c ILT	208	this->write_section_header<size, big_endian>(".data", &shstrtab,
	209	elfcpp::SHT_PROGBITS,
	210	(elfcpp::SHF_ALLOC
	211	\| elfcpp::SHF_WRITE),
	212	data_offset,
	213	filesize, 0, 0,
f0b886e3	214	1, 0, &pout);
bc644c6c ILT	215	this->write_section_header<size, big_endian>(".symtab", &shstrtab,
	216	elfcpp::SHT_SYMTAB,
	217	0, symtab_offset, 4 * sym_size,
	218	3, 1, align, sym_size, &pout);
	219	this->write_section_header<size, big_endian>(".strtab", &shstrtab,
	220	elfcpp::SHT_STRTAB,
	221	0, strtab_offset,
	222	strtab.get_strtab_size(),
	223	0, 0, 1, 0, &pout);
	224	this->write_section_header<size, big_endian>(".shstrtab", &shstrtab,
	225	elfcpp::SHT_STRTAB,
	226	0, shstrtab_offset,
	227	shstrtab.get_strtab_size(),
	228	0, 0, 1, 0, &pout);
	229
69d53f7a ILT	230	if (filesize > 0)
	231	{
	232	memcpy(pout, fileview, filesize);
	233	pout += filesize;
	234	memset(pout, 0, aligned_filesize - filesize);
	235	pout += aligned_filesize - filesize;
	236	}
bc644c6c ILT	237
	238	this->write_symbol<size, big_endian>("", &strtab, 0, 0, &pout);
	239	this->write_symbol<size, big_endian>(start_symbol_name, &strtab, 0, 1,
	240	&pout);
	241	this->write_symbol<size, big_endian>(end_symbol_name, &strtab, filesize, 1,
	242	&pout);
	243	this->write_symbol<size, big_endian>(size_symbol_name, &strtab, filesize,
	244	elfcpp::SHN_ABS, &pout);
	245
	246	strtab.write_to_buffer(pout, strtab.get_strtab_size());
	247	pout += strtab.get_strtab_size();
	248
	249	shstrtab.write_to_buffer(pout, shstrtab.get_strtab_size());
	250	pout += shstrtab.get_strtab_size();
	251
	252	gold_assert(static_cast<size_t>(pout - buffer) == output_size);
	253
	254	this->data_ = buffer;
	255	this->filesize_ = output_size;
	256
	257	f.unlock(task);
	258
	259	return true;
	260	}
	261
	262	// Write out the file header.
	263
	264	template<int size, bool big_endian>
	265	void
	266	Binary_to_elf::write_file_header(unsigned char** ppout)
	267	{
	268	elfcpp::Ehdr_write<size, big_endian> oehdr(*ppout);
	269
	270	unsigned char e_ident[elfcpp::EI_NIDENT];
	271	memset(e_ident, 0, elfcpp::EI_NIDENT);
	272	e_ident[elfcpp::EI_MAG0] = elfcpp::ELFMAG0;
	273	e_ident[elfcpp::EI_MAG1] = elfcpp::ELFMAG1;
	274	e_ident[elfcpp::EI_MAG2] = elfcpp::ELFMAG2;
	275	e_ident[elfcpp::EI_MAG3] = elfcpp::ELFMAG3;
	276	if (size == 32)
	277	e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS32;
	278	else if (size == 64)
	279	e_ident[elfcpp::EI_CLASS] = elfcpp::ELFCLASS64;
	280	else
	281	gold_unreachable();
	282	e_ident[elfcpp::EI_DATA] = (big_endian
	283	? elfcpp::ELFDATA2MSB
	284	: elfcpp::ELFDATA2LSB);
	285	e_ident[elfcpp::EI_VERSION] = elfcpp::EV_CURRENT;
	286	oehdr.put_e_ident(e_ident);
	287
	288	oehdr.put_e_type(elfcpp::ET_REL);
	289	oehdr.put_e_machine(this->elf_machine_);
	290	oehdr.put_e_version(elfcpp::EV_CURRENT);
	291	oehdr.put_e_entry(0);
	292	oehdr.put_e_phoff(0);
	293	oehdr.put_e_shoff(elfcpp::Elf_sizes<size>::ehdr_size);
	294	oehdr.put_e_flags(0);
	295	oehdr.put_e_ehsize(elfcpp::Elf_sizes<size>::ehdr_size);
	296	oehdr.put_e_phentsize(0);
	297	oehdr.put_e_phnum(0);
	298	oehdr.put_e_shentsize(elfcpp::Elf_sizes<size>::shdr_size);
	299	oehdr.put_e_shnum(5);
	300	oehdr.put_e_shstrndx(4);
301
302	*ppout += elfcpp::Elf_sizes<size>::ehdr_size;
303	}
304
305	// Write out a section header.
306
307	template<int size, bool big_endian>
308	void
309	Binary_to_elf::write_section_header(
310	const char* name,
311	const Stringpool* shstrtab,
312	elfcpp::SHT type,
313	unsigned int flags,
314	section_size_type offset,
315	section_size_type section_size,
316	unsigned int link,
317	unsigned int info,
318	unsigned int addralign,
319	unsigned int entsize,
320	unsigned char** ppout)
321	{
322	elfcpp::Shdr_write<size, big_endian> oshdr(*ppout);
323
324	oshdr.put_sh_name(*name == '\0' ? 0 : shstrtab->get_offset(name));
325	oshdr.put_sh_type(type);
326	oshdr.put_sh_flags(flags);
327	oshdr.put_sh_addr(0);
328	oshdr.put_sh_offset(offset);
329	oshdr.put_sh_size(section_size);
330	oshdr.put_sh_link(link);
331	oshdr.put_sh_info(info);
332	oshdr.put_sh_addralign(addralign);
333	oshdr.put_sh_entsize(entsize);
334
335	*ppout += elfcpp::Elf_sizes<size>::shdr_size;
336	}
337
338	// Write out a symbol.
339
340	template<int size, bool big_endian>
341	void
342	Binary_to_elf::write_symbol(
343	const std::string& name,
344	const Stringpool* strtab,
345	section_size_type value,
346	unsigned int shndx,
347	unsigned char** ppout)
348	{
349	unsigned char* pout = *ppout;
350
351	elfcpp::Sym_write<size, big_endian> osym(pout);
352	osym.put_st_name(name.empty() ? 0 : strtab->get_offset(name.c_str()));
353	osym.put_st_value(value);
354	osym.put_st_size(0);
355	osym.put_st_info(name.empty() ? elfcpp::STB_LOCAL : elfcpp::STB_GLOBAL,
356	elfcpp::STT_NOTYPE);
357	osym.put_st_other(elfcpp::STV_DEFAULT, 0);
358	osym.put_st_shndx(shndx);
359
360	*ppout += elfcpp::Elf_sizes<size>::sym_size;
361	}
362
363	} // End namespace gold.