2011-03-24 Eric B. Weddington <eric.weddington@atmel.com>
[binutils.git] / gold / freebsd.h
blobde697357f41f1bb10d89f857bf178f7924d49bc5
1 // freebsd.h -- FreeBSD support for gold -*- C++ -*-
3 // Copyright 2009 Free Software Foundation, Inc.
4 // Written by Ian Lance Taylor <iant@google.com>.
6 // This file is part of gold.
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.
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.
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.
23 #include "target.h"
24 #include "target-select.h"
26 #ifndef GOLD_FREEBSD_H
27 #define GOLD_FREEBSD_H
29 namespace gold
32 // FreeBSD 4.1 and later wants the EI_OSABI field in the ELF header to
33 // be set to ELFOSABI_FREEBSD. This is a subclass of Sized_target
34 // which supports that. The real target would be a subclass of this
35 // one. We permit combining FreeBSD and non-FreeBSD object files.
36 // The effect of this target is to set the code in the output file.
38 template<int size, bool big_endian>
39 class Target_freebsd : public Sized_target<size, big_endian>
41 public:
42 // Set the value to use for the EI_OSABI field in the ELF header.
43 void
44 set_osabi(elfcpp::ELFOSABI osabi)
45 { this->osabi_ = osabi; }
47 protected:
48 Target_freebsd(const Target::Target_info* pti)
49 : Sized_target<size, big_endian>(pti),
50 osabi_(elfcpp::ELFOSABI_NONE)
51 { }
53 virtual void
54 do_adjust_elf_header(unsigned char* view, int len) const;
56 private:
57 // Value to store in the EI_OSABI field of the ELF file header.
58 elfcpp::ELFOSABI osabi_;
61 // Adjust the ELF file header by storing the requested value in the
62 // OSABI field. This is for FreeBSD support.
64 template<int size, bool big_endian>
65 inline void
66 Target_freebsd<size, big_endian>::do_adjust_elf_header(unsigned char* view,
67 int len) const
69 if (this->osabi_ != elfcpp::ELFOSABI_NONE)
71 gold_assert(len == elfcpp::Elf_sizes<size>::ehdr_size);
73 elfcpp::Ehdr<size, false> ehdr(view);
74 unsigned char e_ident[elfcpp::EI_NIDENT];
75 memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT);
77 e_ident[elfcpp::EI_OSABI] = this->osabi_;
79 elfcpp::Ehdr_write<size, false> oehdr(view);
80 oehdr.put_e_ident(e_ident);
84 // A target selector for targets which permit combining both FreeBSD
85 // and non-FreeBSD object files.
87 class Target_selector_freebsd : public Target_selector
89 public:
90 Target_selector_freebsd(int machine, int size, bool is_big_endian,
91 const char* bfd_name,
92 const char* freebsd_bfd_name)
93 : Target_selector(machine, size, is_big_endian, NULL),
94 bfd_name_(bfd_name), freebsd_bfd_name_(freebsd_bfd_name)
95 { }
97 protected:
98 // If we see a FreeBSD input file, mark the output file as using
99 // FreeBSD.
100 virtual Target*
101 do_recognize(int, int osabi, int)
103 Target* ret = this->instantiate_target();
104 if (osabi == elfcpp::ELFOSABI_FREEBSD)
105 this->set_osabi(ret);
106 return ret;
109 // Recognize two names.
110 virtual Target*
111 do_recognize_by_name(const char* name)
113 if (strcmp(name, this->bfd_name_) == 0)
114 return this->instantiate_target();
115 else if (strcmp(name, this->freebsd_bfd_name_) == 0)
117 Target* ret = this->instantiate_target();
118 this->set_osabi(ret);
119 return ret;
121 else
122 return NULL;
125 // Print both names in --help output.
126 virtual void
127 do_supported_names(std::vector<const char*>* names)
129 names->push_back(this->bfd_name_);
130 names->push_back(this->freebsd_bfd_name_);
133 private:
134 // Set the OSABI field. This is quite ugly.
135 void
136 set_osabi(Target* target)
138 if (this->get_size() == 32)
140 if (this->is_big_endian())
141 static_cast<Target_freebsd<32, true>*>(target)->
142 set_osabi(elfcpp::ELFOSABI_FREEBSD);
143 else
144 static_cast<Target_freebsd<32, false>*>(target)->
145 set_osabi(elfcpp::ELFOSABI_FREEBSD);
147 else if (this->get_size() == 64)
149 if (this->is_big_endian())
150 static_cast<Target_freebsd<64, true>*>(target)->
151 set_osabi(elfcpp::ELFOSABI_FREEBSD);
152 else
153 static_cast<Target_freebsd<64, false>*>(target)->
154 set_osabi(elfcpp::ELFOSABI_FREEBSD);
156 else
157 gold_unreachable();
160 // The BFD name for the non-Freebsd target.
161 const char* bfd_name_;
162 // The BFD name for the Freebsd target.
163 const char* freebsd_bfd_name_;
166 } // end namespace gold
168 #endif // !defined(GOLD_FREEBSD_H)