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130 lines
4.0 KiB
C
130 lines
4.0 KiB
C
/* Generic relocation support for BFD.
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Copyright (C) 1998-2017 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 3 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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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 precedes 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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preceding *_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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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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