include/elf/reloc-macros.h

   1 /* Generic relocation support for BFD.
   2    Copyright (C) 1998 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software Foundation,
  18    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* These macros are used by the various *.h target specific header
  21    files to either generate an enum containing all the known relocations
  22    for that target, or if RELOC_MACROS_GEN_FUNC is defined, a recognition
  23    function is generated instead.  (This is used by binutils/readelf.c)
  24
  25    Given a header file like this:
  26
  27         START_RELOC_NUMBERS (foo)
  28             RELOC_NUMBER (R_foo_NONE,    0)
  29             RELOC_NUMBER (R_foo_32,      1)
  30             FAKE_RELOC   (R_foo_illegal, 2)
  31             EMPTY_RELOC  (R_foo_max)
  32         END_RELOC_NUMBERS
  33
  34    Then the following will be produced by default (ie if
  35    RELOC_MACROS_GEN_FUNC is *not* defined).
  36
  37         enum foo
  38         {
  39           foo = -1,
  40           R_foo_NONE = 0,
  41           R_foo_32 = 1,
  42           R_foo_illegal = 2,
  43           R_foo_max
  44         };
  45
  46    If RELOC_MACROS_GEN_FUNC *is* defined, then instead the
  47    following function will be generated:
  48
  49         static char * foo PARAMS ((unsigned long rtype));
  50         static char *
  51         foo (rtype)
  52             unsigned long rtype;
  53         {
  54            switch (rtype)
  55            {
  56            case 0: return "R_foo_NONE";
  57            case 1: return "R_foo_32";
  58            default: return NULL;
  59            }
  60         }
  61    */
  62
  63 #ifndef _RELOC_MACROS_H
  64 #define _RELOC_MACROS_H
  65
  66 #ifdef RELOC_MACROS_GEN_FUNC
  67
  68 /* This function takes the relocation number and returns the
  69    string version name of the name of that relocation.  If
  70    the relocation is not recognised, NULL is returned.  */
  71
  72 #define START_RELOC_NUMBERS(name)                               \
  73 static const char * name    PARAMS ((unsigned long rtype));     \
  74 static const char *                                             \
  75 name (rtype)                                                    \
  76         unsigned long rtype;                                    \
  77 {                                                               \
  78   switch (rtype)                                                \
  79   {
  80
  81 #ifdef __STDC__
  82 #define RELOC_NUMBER(name, number)  case number : return #name ;
  83 #else
  84 #define RELOC_NUMBER(name, number)  case number : return "name" ;
  85 #endif
  86
  87 #define FAKE_RELOC(name, number)
  88 #define EMPTY_RELOC(name)
  89
  90 #define END_RELOC_NUMBERS       \
  91     default: return NULL;       \
  92   }                             \
  93 }
  94
  95
  96 #else /* Default to generating enum.  */
  97
  98 /* Some compilers cannot cope with an enum that ends with a trailing
  99    comma, so START_RELOC_NUMBERS creates a fake reloc entry, (initialised
 100    to -1 so that the first real entry will still default to 0).  Further
 101    entries then prepend a comma to their definitions, creating a list
 102    of enumerator entries that will satisfy these compilers.  */
 103 #ifdef __STDC__
 104 #define START_RELOC_NUMBERS(name)   enum name { _##name = -1
 105 #else
 106 #define START_RELOC_NUMBERS(name)   enum name { name = -1
 107 #endif
 108
 109 #define RELOC_NUMBER(name, number)  , name = number
 110 #define FAKE_RELOC(name, number)    , name = number
 111 #define EMPTY_RELOC(name)           , name
 112 #define END_RELOC_NUMBERS           };
 113
 114 #endif
 115
 116 #endif /* RELOC_MACROS_H */