gold/reloc-types.h

   1 // reloc-types.h -- ELF relocation templates for gold  -*- C++ -*-
   2
   3 // Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
   4 // Written by Ian Lance Taylor <iant@google.com>.
   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 // This header files defines a few convenient templated types for use
  24 // when handling ELF relocations.
  25
  26 #ifndef GOLD_RELOC_TYPES_H
  27 #define GOLD_RELOC_TYPES_H
  28
  29 #include "elfcpp.h"
  30
  31 namespace gold
  32 {
  33
  34 // Pick the ELF relocation accessor class and the size based on
  35 // SH_TYPE, which is either elfcpp::SHT_REL or elfcpp::SHT_RELA.
  36
  37 template<int sh_type, int size, bool big_endian>
  38 struct Reloc_types;
  39
  40 template<int size, bool big_endian>
  41 struct Reloc_types<elfcpp::SHT_REL, size, big_endian>
  42 {
  43   typedef typename elfcpp::Rel<size, big_endian> Reloc;
  44   typedef typename elfcpp::Rel_write<size, big_endian> Reloc_write;
  45   static const int reloc_size = elfcpp::Elf_sizes<size>::rel_size;
  46
  47   static inline typename elfcpp::Elf_types<size>::Elf_Swxword
  48   get_reloc_addend(const Reloc*)
  49   { gold_unreachable(); }
  50
  51   static inline typename elfcpp::Elf_types<size>::Elf_Swxword
  52   get_reloc_addend_noerror(const Reloc*)
  53   { return 0; }
  54
  55   static inline void
  56   set_reloc_addend(Reloc_write*,
  57                    typename elfcpp::Elf_types<size>::Elf_Swxword)
  58   { gold_unreachable(); }
  59
  60   static inline void
  61   copy_reloc_addend(Reloc_write*, const Reloc*)
  62   { gold_unreachable(); }
  63 };
  64
  65 template<int size, bool big_endian>
  66 struct Reloc_types<elfcpp::SHT_RELA, size, big_endian>
  67 {
  68   typedef typename elfcpp::Rela<size, big_endian> Reloc;
  69   typedef typename elfcpp::Rela_write<size, big_endian> Reloc_write;
  70   static const int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
  71
  72   static inline typename elfcpp::Elf_types<size>::Elf_Swxword
  73   get_reloc_addend(const Reloc* p)
  74   { return p->get_r_addend(); }
  75
  76   static inline typename elfcpp::Elf_types<size>::Elf_Swxword
  77   get_reloc_addend_noerror(const Reloc* p)
  78   { return p->get_r_addend(); }
  79
  80   static inline void
  81   set_reloc_addend(Reloc_write* p,
  82                    typename elfcpp::Elf_types<size>::Elf_Swxword val)
  83   { p->put_r_addend(val); }
  84
  85   static inline void
  86   copy_reloc_addend(Reloc_write* to, const Reloc* from)
  87   { to->put_r_addend(from->get_r_addend()); }
  88 };
  89
  90 }; // End namespace gold.
  91
  92 #endif // !defined(GOLD_RELOC_TYPE_SH)