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// freebsd.h -- FreeBSD support for gold -*- C++ -*-
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// freebsd.h -- FreeBSD support for gold -*- C++ -*-
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// Copyright 2009 Free Software Foundation, Inc.
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// Copyright 2009, 2011 Free Software Foundation, Inc.
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// Written by Ian Lance Taylor <iant@google.com>.
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// Written by Ian Lance Taylor <iant@google.com>.
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// This file is part of gold.
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// This file is part of gold.
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// This program is free software; you can redistribute it and/or modify
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// This program is free software; you can redistribute it and/or modify
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namespace gold
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namespace gold
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{
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{
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// FreeBSD 4.1 and later wants the EI_OSABI field in the ELF header to
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// FreeBSD 4.1 and later wants the EI_OSABI field in the ELF header to
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// be set to ELFOSABI_FREEBSD. This is a subclass of Sized_target
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// be set to ELFOSABI_FREEBSD. This is a target selector for targets
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// which supports that. The real target would be a subclass of this
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// which permit combining both FreeBSD and non-FreeBSD object files.
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// one. We permit combining FreeBSD and non-FreeBSD object files.
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// The effect of this target is to set the code in the output file.
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template<int size, bool big_endian>
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class Target_freebsd : public Sized_target<size, big_endian>
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{
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public:
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// Set the value to use for the EI_OSABI field in the ELF header.
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void
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set_osabi(elfcpp::ELFOSABI osabi)
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{ this->osabi_ = osabi; }
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protected:
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Target_freebsd(const Target::Target_info* pti)
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: Sized_target<size, big_endian>(pti),
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osabi_(elfcpp::ELFOSABI_NONE)
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{ }
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virtual void
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do_adjust_elf_header(unsigned char* view, int len) const;
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private:
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// Value to store in the EI_OSABI field of the ELF file header.
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elfcpp::ELFOSABI osabi_;
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};
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// Adjust the ELF file header by storing the requested value in the
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// OSABI field. This is for FreeBSD support.
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template<int size, bool big_endian>
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inline void
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Target_freebsd<size, big_endian>::do_adjust_elf_header(unsigned char* view,
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int len) const
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{
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if (this->osabi_ != elfcpp::ELFOSABI_NONE)
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{
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gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size);
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elfcpp::Ehdr<size, false> ehdr(view);
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unsigned char e_ident[elfcpp::EI_NIDENT];
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memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT);
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e_ident[elfcpp::EI_OSABI] = this->osabi_;
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elfcpp::Ehdr_write<size, false> oehdr(view);
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oehdr.put_e_ident(e_ident);
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}
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}
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// A target selector for targets which permit combining both FreeBSD
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// and non-FreeBSD object files.
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class Target_selector_freebsd : public Target_selector
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class Target_selector_freebsd : public Target_selector
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{
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{
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public:
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public:
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Target_selector_freebsd(int machine, int size, bool is_big_endian,
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Target_selector_freebsd(int machine, int size, bool is_big_endian,
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const char* bfd_name,
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const char* bfd_name,
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const char* freebsd_bfd_name)
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const char* freebsd_bfd_name,
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: Target_selector(machine, size, is_big_endian, NULL),
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const char* emulation)
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: Target_selector(machine, size, is_big_endian, NULL, emulation),
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bfd_name_(bfd_name), freebsd_bfd_name_(freebsd_bfd_name)
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bfd_name_(bfd_name), freebsd_bfd_name_(freebsd_bfd_name)
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{ }
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{ }
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protected:
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protected:
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// If we see a FreeBSD input file, mark the output file as using
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// If we see a FreeBSD input file, mark the output file as using
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virtual Target*
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virtual Target*
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do_recognize(int, int osabi, int)
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do_recognize(int, int osabi, int)
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{
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{
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Target* ret = this->instantiate_target();
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Target* ret = this->instantiate_target();
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if (osabi == elfcpp::ELFOSABI_FREEBSD)
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if (osabi == elfcpp::ELFOSABI_FREEBSD)
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this->set_osabi(ret);
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ret->set_osabi(static_cast<elfcpp::ELFOSABI>(osabi));
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return ret;
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return ret;
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}
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}
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// Recognize two names.
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// Recognize two names.
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virtual Target*
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virtual Target*
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do_recognize_by_name(const char* name)
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do_recognize_by_bfd_name(const char* name)
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{
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{
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if (strcmp(name, this->bfd_name_) == 0)
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if (strcmp(name, this->bfd_name_) == 0)
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return this->instantiate_target();
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return this->instantiate_target();
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else if (strcmp(name, this->freebsd_bfd_name_) == 0)
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else if (strcmp(name, this->freebsd_bfd_name_) == 0)
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{
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{
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Target* ret = this->instantiate_target();
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Target* ret = this->instantiate_target();
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this->set_osabi(ret);
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ret->set_osabi(elfcpp::ELFOSABI_FREEBSD);
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return ret;
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return ret;
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}
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}
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else
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else
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return NULL;
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return NULL;
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}
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}
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// Print both names in --help output.
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// Print both names in --help output.
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virtual void
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virtual void
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do_supported_names(std::vector<const char*>* names)
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do_supported_bfd_names(std::vector<const char*>* names)
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{
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{
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names->push_back(this->bfd_name_);
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names->push_back(this->bfd_name_);
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names->push_back(this->freebsd_bfd_name_);
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names->push_back(this->freebsd_bfd_name_);
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}
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}
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private:
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// Return appropriate BFD name.
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// Set the OSABI field. This is quite ugly.
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virtual const char*
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void
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do_target_bfd_name(const Target* target)
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set_osabi(Target* target)
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{
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if (this->get_size() == 32)
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{
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if (this->is_big_endian())
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static_cast<Target_freebsd<32, true>*>(target)->
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set_osabi(elfcpp::ELFOSABI_FREEBSD);
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else
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static_cast<Target_freebsd<32, false>*>(target)->
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set_osabi(elfcpp::ELFOSABI_FREEBSD);
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}
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else if (this->get_size() == 64)
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{
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{
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if (this->is_big_endian())
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if (!this->is_our_target(target))
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static_cast<Target_freebsd<64, true>*>(target)->
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return NULL;
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set_osabi(elfcpp::ELFOSABI_FREEBSD);
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return (target->osabi() == elfcpp::ELFOSABI_FREEBSD
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else
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? this->freebsd_bfd_name_
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static_cast<Target_freebsd<64, false>*>(target)->
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: this->bfd_name_);
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set_osabi(elfcpp::ELFOSABI_FREEBSD);
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}
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else
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gold_unreachable();
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}
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}
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private:
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// The BFD name for the non-Freebsd target.
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// The BFD name for the non-Freebsd target.
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const char* bfd_name_;
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const char* bfd_name_;
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// The BFD name for the Freebsd target.
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// The BFD name for the Freebsd target.
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const char* freebsd_bfd_name_;
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const char* freebsd_bfd_name_;
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};
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};
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