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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [include/] [elf/] [reloc-macros.h] - Rev 357
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/* Generic relocation support for BFD. Copyright 1998, 1999, 2000, 2003 Free Software Foundation, Inc. This file is part of BFD, the Binary File Descriptor library. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ /* These macros are used by the various *.h target specific header files to either generate an enum containing all the known relocations for that target, or if RELOC_MACROS_GEN_FUNC is defined, a recognition function is generated instead. (This is used by binutils/readelf.c) Given a header file like this: START_RELOC_NUMBERS (foo) RELOC_NUMBER (R_foo_NONE, 0) RELOC_NUMBER (R_foo_32, 1) EMPTY_RELOC (R_foo_good) FAKE_RELOC (R_foo_illegal, 9) END_RELOC_NUMBERS (R_foo_count) Then the following will be produced by default (ie if RELOC_MACROS_GEN_FUNC is *not* defined). enum foo { R_foo_NONE = 0, R_foo_32 = 1, R_foo_good, R_foo_illegal = 9, R_foo_count }; Note: The value of the symbol defined in the END_RELOC_NUMBERS macro (R_foo_count in the case of the example above) will be set to the value of the whichever *_RELOC macro preceeds it plus one. Therefore if you intend to use the symbol as a sentinel for the highest valid macro value you should make sure that the preceeding *_RELOC macro is the highest valid number. ie a declaration like this: START_RELOC_NUMBERS (foo) RELOC_NUMBER (R_foo_NONE, 0) RELOC_NUMBER (R_foo_32, 1) FAKE_RELOC (R_foo_illegal, 9) FAKE_RELOC (R_foo_synonym, 0) END_RELOC_NUMBERS (R_foo_count) will result in R_foo_count having a value of 1 (R_foo_synonym + 1) rather than 10 or 2 as might be expected. Alternatively you can assign a value to END_RELOC_NUMBERS symbol explicitly, like this: START_RELOC_NUMBERS (foo) RELOC_NUMBER (R_foo_NONE, 0) RELOC_NUMBER (R_foo_32, 1) FAKE_RELOC (R_foo_illegal, 9) FAKE_RELOC (R_foo_synonym, 0) END_RELOC_NUMBERS (R_foo_count = 2) If RELOC_MACROS_GEN_FUNC *is* defined, then instead the following function will be generated: static const char *foo (unsigned long rtype); static const char * foo (unsigned long rtype) { switch (rtype) { case 0: return "R_foo_NONE"; case 1: return "R_foo_32"; default: return NULL; } } */ #ifndef _RELOC_MACROS_H #define _RELOC_MACROS_H #ifdef RELOC_MACROS_GEN_FUNC /* This function takes the relocation number and returns the string version name of the name of that relocation. If the relocation is not recognised, NULL is returned. */ #define START_RELOC_NUMBERS(name) \ static const char *name (unsigned long rtype); \ static const char * \ name (unsigned long rtype) \ { \ switch (rtype) \ { #define RELOC_NUMBER(name, number) \ case number: return #name; #define FAKE_RELOC(name, number) #define EMPTY_RELOC(name) #define END_RELOC_NUMBERS(name) \ default: return NULL; \ } \ } #else /* Default to generating enum. */ #define START_RELOC_NUMBERS(name) enum name { #define RELOC_NUMBER(name, number) name = number, #define FAKE_RELOC(name, number) name = number, #define EMPTY_RELOC(name) name, #define END_RELOC_NUMBERS(name) name }; #endif #endif /* _RELOC_MACROS_H */
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