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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [include/] [elf/] [reloc-macros.h] - Blame information for rev 225

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1 24 jeremybenn
/* Generic relocation support for BFD.
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   Copyright 1998, 1999, 2000, 2003 Free Software Foundation, Inc.
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   This file is part of BFD, the Binary File Descriptor library.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 2 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software Foundation,
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   Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
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/* These macros are used by the various *.h target specific header
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   files to either generate an enum containing all the known relocations
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   for that target, or if RELOC_MACROS_GEN_FUNC is defined, a recognition
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   function is generated instead.  (This is used by binutils/readelf.c)
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   Given a header file like this:
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        START_RELOC_NUMBERS (foo)
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            RELOC_NUMBER (R_foo_NONE,    0)
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            RELOC_NUMBER (R_foo_32,      1)
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            EMPTY_RELOC  (R_foo_good)
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            FAKE_RELOC   (R_foo_illegal, 9)
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        END_RELOC_NUMBERS (R_foo_count)
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   Then the following will be produced by default (ie if
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   RELOC_MACROS_GEN_FUNC is *not* defined).
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        enum foo
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        {
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          R_foo_NONE = 0,
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          R_foo_32 = 1,
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          R_foo_good,
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          R_foo_illegal = 9,
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          R_foo_count
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        };
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46 225 jeremybenn
   Note: The value of the symbol defined in the END_RELOC_NUMBERS
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   macro (R_foo_count in the case of the example above) will be
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   set to the value of the whichever *_RELOC macro preceeds it plus
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   one.  Therefore if you intend to use the symbol as a sentinel for
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   the highest valid macro value you should make sure that the
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   preceeding *_RELOC macro is the highest valid number.  ie a
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   declaration like this:
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        START_RELOC_NUMBERS (foo)
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            RELOC_NUMBER (R_foo_NONE,    0)
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            RELOC_NUMBER (R_foo_32,      1)
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            FAKE_RELOC   (R_foo_illegal, 9)
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            FAKE_RELOC   (R_foo_synonym, 0)
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        END_RELOC_NUMBERS (R_foo_count)
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   will result in R_foo_count having a value of 1 (R_foo_synonym + 1)
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   rather than 10 or 2 as might be expected.
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   Alternatively you can assign a value to END_RELOC_NUMBERS symbol
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   explicitly, like this:
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        START_RELOC_NUMBERS (foo)
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            RELOC_NUMBER (R_foo_NONE,    0)
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            RELOC_NUMBER (R_foo_32,      1)
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            FAKE_RELOC   (R_foo_illegal, 9)
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            FAKE_RELOC   (R_foo_synonym, 0)
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        END_RELOC_NUMBERS (R_foo_count = 2)
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74 24 jeremybenn
   If RELOC_MACROS_GEN_FUNC *is* defined, then instead the
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   following function will be generated:
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        static const char *foo (unsigned long rtype);
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        static const char *
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        foo (unsigned long rtype)
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        {
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           switch (rtype)
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           {
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           case 0: return "R_foo_NONE";
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           case 1: return "R_foo_32";
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           default: return NULL;
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           }
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        }
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   */
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#ifndef _RELOC_MACROS_H
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#define _RELOC_MACROS_H
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#ifdef RELOC_MACROS_GEN_FUNC
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/* This function takes the relocation number and returns the
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   string version name of the name of that relocation.  If
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   the relocation is not recognised, NULL is returned.  */
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#define START_RELOC_NUMBERS(name)                               \
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static const char *name (unsigned long rtype);                  \
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static const char *                                             \
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name (unsigned long rtype)                                      \
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{                                                               \
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  switch (rtype)                                                \
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    {
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#define RELOC_NUMBER(name, number) \
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    case number: return #name;
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#define FAKE_RELOC(name, number)
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#define EMPTY_RELOC(name)
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#define END_RELOC_NUMBERS(name) \
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    default: return NULL;       \
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    }                           \
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}
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#else /* Default to generating enum.  */
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#define START_RELOC_NUMBERS(name)   enum name {
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#define RELOC_NUMBER(name, number)  name = number,
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#define FAKE_RELOC(name, number)    name = number,
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#define EMPTY_RELOC(name)           name,
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#define END_RELOC_NUMBERS(name)     name };
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#endif
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#endif /* _RELOC_MACROS_H */

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