include/elf/reloc-macros.h

   1 /* Generic relocation support for BFD.
   2    Copyright 1998, 1999, 2000, 2003 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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             EMPTY_RELOC  (R_foo_good)
  31             FAKE_RELOC   (R_foo_illegal, 9)
  32         END_RELOC_NUMBERS (R_foo_count)
  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           R_foo_NONE = 0,
  40           R_foo_32 = 1,
  41           R_foo_good,
  42           R_foo_illegal = 9,
  43           R_foo_count
  44         };
  45
  46    If RELOC_MACROS_GEN_FUNC *is* defined, then instead the
  47    following function will be generated:
  48
  49         static const char *foo (unsigned long rtype);
  50         static const char *
  51         foo (unsigned long rtype)
  52         {
  53            switch (rtype)
  54            {
  55            case 0: return "R_foo_NONE";
  56            case 1: return "R_foo_32";
  57            default: return NULL;
  58            }
  59         }
  60    */
  61
  62 #ifndef _RELOC_MACROS_H
  63 #define _RELOC_MACROS_H
  64
  65 #ifdef RELOC_MACROS_GEN_FUNC
  66
  67 /* This function takes the relocation number and returns the
  68    string version name of the name of that relocation.  If
  69    the relocation is not recognised, NULL is returned.  */
  70
  71 #define START_RELOC_NUMBERS(name)                               \
  72 static const char *name (unsigned long rtype);                  \
  73 static const char *                                             \
  74 name (unsigned long rtype)                                      \
  75 {                                                               \
  76   switch (rtype)                                                \
  77     {
  78
  79 #define RELOC_NUMBER(name, number) \
  80     case number: return #name;
  81
  82 #define FAKE_RELOC(name, number)
  83 #define EMPTY_RELOC(name)
  84
  85 #define END_RELOC_NUMBERS(name) \
  86     default: return NULL;       \
  87     }                           \
  88 }
  89
  90
  91 #else /* Default to generating enum.  */
  92
  93 #define START_RELOC_NUMBERS(name)   enum name {
  94 #define RELOC_NUMBER(name, number)  name = number,
  95 #define FAKE_RELOC(name, number)    name = number,
  96 #define EMPTY_RELOC(name)           name,
  97 #define END_RELOC_NUMBERS(name)     name };
  98
  99 #endif
 100
 101 #endif /* RELOC_MACROS_H */