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// freebsd.h -- FreeBSD support for gold -*- C++ -*-
// Copyright 2009 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 "target.h"
#include "target-select.h"
#ifndef GOLD_FREEBSD_H
#define GOLD_FREEBSD_H
namespace gold
{
// FreeBSD 4.1 and later wants the EI_OSABI field in the ELF header to
// be set to ELFOSABI_FREEBSD. This is a subclass of Sized_target
// which supports that. The real target would be a subclass of this
// one. We permit combining FreeBSD and non-FreeBSD object files.
// The effect of this target is to set the code in the output file.
template<int size, bool big_endian>
class Target_freebsd : public Sized_target<size, big_endian>
{
public:
// Set the value to use for the EI_OSABI field in the ELF header.
void
set_osabi(elfcpp::ELFOSABI osabi)
{ this->osabi_ = osabi; }
protected:
Target_freebsd(const Target::Target_info* pti)
: Sized_target<size, big_endian>(pti),
osabi_(elfcpp::ELFOSABI_NONE)
{ }
virtual void
do_adjust_elf_header(unsigned char* view, int len) const;
private:
// Value to store in the EI_OSABI field of the ELF file header.
elfcpp::ELFOSABI osabi_;
};
// Adjust the ELF file header by storing the requested value in the
// OSABI field. This is for FreeBSD support.
template<int size, bool big_endian>
inline void
Target_freebsd<size, big_endian>::do_adjust_elf_header(unsigned char* view,
int len) const
{
if (this->osabi_ != elfcpp::ELFOSABI_NONE)
{
gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size);
elfcpp::Ehdr<size, false> ehdr(view);
unsigned char e_ident[elfcpp::EI_NIDENT];
memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT);
e_ident[elfcpp::EI_OSABI] = this->osabi_;
elfcpp::Ehdr_write<size, false> oehdr(view);
oehdr.put_e_ident(e_ident);
}
}
// A target selector for targets which permit combining both FreeBSD
// and non-FreeBSD object files.
class Target_selector_freebsd : public Target_selector
{
public:
Target_selector_freebsd(int machine, int size, bool is_big_endian,
const char* bfd_name,
const char* freebsd_bfd_name)
: Target_selector(machine, size, is_big_endian, NULL),
bfd_name_(bfd_name), freebsd_bfd_name_(freebsd_bfd_name)
{ }
protected:
// If we see a FreeBSD input file, mark the output file as using
// FreeBSD.
virtual Target*
do_recognize(int, int osabi, int)
{
Target* ret = this->instantiate_target();
if (osabi == elfcpp::ELFOSABI_FREEBSD)
this->set_osabi(ret);
return ret;
}
// Recognize two names.
virtual Target*
do_recognize_by_name(const char* name)
{
if (strcmp(name, this->bfd_name_) == 0)
return this->instantiate_target();
else if (strcmp(name, this->freebsd_bfd_name_) == 0)
{
Target* ret = this->instantiate_target();
this->set_osabi(ret);
return ret;
}
else
return NULL;
}
// Print both names in --help output.
virtual void
do_supported_names(std::vector<const char*>* names)
{
names->push_back(this->bfd_name_);
names->push_back(this->freebsd_bfd_name_);
}
private:
// Set the OSABI field. This is quite ugly.
void
set_osabi(Target* target)
{
if (this->get_size() == 32)
{
if (this->is_big_endian())
static_cast<Target_freebsd<32, true>*>(target)->
set_osabi(elfcpp::ELFOSABI_FREEBSD);
else
static_cast<Target_freebsd<32, false>*>(target)->
set_osabi(elfcpp::ELFOSABI_FREEBSD);
}
else if (this->get_size() == 64)
{
if (this->is_big_endian())
static_cast<Target_freebsd<64, true>*>(target)->
set_osabi(elfcpp::ELFOSABI_FREEBSD);
else
static_cast<Target_freebsd<64, false>*>(target)->
set_osabi(elfcpp::ELFOSABI_FREEBSD);
}
else
gold_unreachable();
}
// The BFD name for the non-Freebsd target.
const char* bfd_name_;
// The BFD name for the Freebsd target.
const char* freebsd_bfd_name_;
};
} // end namespace gold
#endif // !defined(GOLD_FREEBSD_H)
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