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140 lines
4.4 KiB
140 lines
4.4 KiB
/*********************************************************************** |
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* xflat/tools/arm/arch.h |
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* Generic relocation support for BFD. |
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* |
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* Copyright (C) 2009 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Simply lifted with minimal change from the BFD, binutils 2.19.1: |
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* |
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* Copyright 1998, 1999, 2000, 2003 Free Software Foundation, Inc. |
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* Free Software Foundation, Inc. |
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* |
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* This file is part of BFD, the Binary File Descriptor library. |
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* |
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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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* |
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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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* |
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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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* |
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***********************************************************************/ |
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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 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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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 __TOOLCHAIN_NXFLAT_RELOC_MACROS_H |
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#define __TOOLCHAIN_NXFLAT_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 /* __TOOLCHAIN_NXFLAT_RELOC_MACROS_H */
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