1  // reloc-types.h -- ELF relocation templates for gold  -*- C++ -*-
       2  
       3  // Copyright (C) 2006-2023 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  
      61  template<int size, bool big_endian>
      62  struct Reloc_types<elfcpp::SHT_RELA, size, big_endian>
      63  {
      64    typedef typename elfcpp::Rela<size, big_endian> Reloc;
      65    typedef typename elfcpp::Rela_write<size, big_endian> Reloc_write;
      66    static const int reloc_size = elfcpp::Elf_sizes<size>::rela_size;
      67  
      68    static inline typename elfcpp::Elf_types<size>::Elf_Swxword
      69    get_reloc_addend(const Reloc* p)
      70    { return p->get_r_addend(); }
      71  
      72    static inline typename elfcpp::Elf_types<size>::Elf_Swxword
      73    get_reloc_addend_noerror(const Reloc* p)
      74    { return p->get_r_addend(); }
      75  
      76    static inline void
      77    set_reloc_addend(Reloc_write* p,
      78  		   typename elfcpp::Elf_types<size>::Elf_Swxword val)
      79    { p->put_r_addend(val); }
      80  };
      81  
      82  }; // End namespace gold.
      83  
      84  #endif // !defined(GOLD_RELOC_TYPE_SH)