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| author | Ian Lance Taylor <ian@airs.com> | 2009-03-02 02:45:29 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@airs.com> | 2009-03-02 02:45:29 +0000 |
| commit | 15d5fa160781daaf2e5c2b1d130f996a502016ea (patch) | |
| tree | b746bde2e4e7c6e1e2878ac6465ed2140d9185d7 /elfcpp/elfcpp_swap.h | |
| parent | 3c54f1401bfc577f557a2a482647b19612b324ff (diff) | |
| download | gdb-15d5fa160781daaf2e5c2b1d130f996a502016ea.zip gdb-15d5fa160781daaf2e5c2b1d130f996a502016ea.tar.gz gdb-15d5fa160781daaf2e5c2b1d130f996a502016ea.tar.bz2 | |
elfcpp:/
* elfcpp_swap.h: #include "config.h". Only #include <byteswap.h>
if HAVE_BYTESWAP_H is defined; if not, provide definitions for
bswap_{16,32,64}. For gcc 4.3 and later, use the builtin bswap
functions. Check WORDS_BIGENDIAN rather than __BYTE_ORDER.
gold:/
* configure.ac: Check for byteswap.h.
* configure: Rebuild.
* config.in: Rebuild.
Diffstat (limited to 'elfcpp/elfcpp_swap.h')
| -rw-r--r-- | elfcpp/elfcpp_swap.h | 58 |
1 files changed, 55 insertions, 3 deletions
diff --git a/elfcpp/elfcpp_swap.h b/elfcpp/elfcpp_swap.h index 9f445dc..0685276 100644 --- a/elfcpp/elfcpp_swap.h +++ b/elfcpp/elfcpp_swap.h @@ -1,6 +1,6 @@ // elfcpp_swap.h -- Handle swapping for elfcpp -*- C++ -*- -// Copyright 2006, 2007, Free Software Foundation, Inc. +// Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. // Written by Ian Lance Taylor <iant@google.com>. // This file is part of elfcpp. @@ -37,8 +37,54 @@ #define ELFCPP_SWAP_H #include <stdint.h> -#include <endian.h> + +// We need an autoconf-generated config.h file for endianness and +// swapping. We check two macros: WORDS_BIGENDIAN and +// HAVE_BYTESWAP_H. + +#include "config.h" + +#ifdef HAVE_BYTESWAP_H #include <byteswap.h> +#else +// Provide our own versions of the byteswap functions. +inline uint16_t +bswap_16(uint16_t v) +{ + return ((v >> 8) & 0xff) | ((v & 0xff) << 8); +} + +inline uint32_t +bswap_32(uint32_t v) +{ + return ( ((v & 0xff000000) >> 24) + | ((v & 0x00ff0000) >> 8) + | ((v & 0x0000ff00) << 8) + | ((v & 0x000000ff) << 24)); +} + +inline uint64_t +bswap_64(uint64_t v) +{ + return ( ((v & 0xff00000000000000ULL) >> 56) + | ((v & 0x00ff000000000000ULL) >> 40) + | ((v & 0x0000ff0000000000ULL) >> 24) + | ((v & 0x000000ff00000000ULL) >> 8) + | ((v & 0x00000000ff000000ULL) << 8) + | ((v & 0x0000000000ff0000ULL) << 24) + | ((v & 0x000000000000ff00ULL) << 40) + | ((v & 0x00000000000000ffULL) << 56)); +} +#endif // !defined(HAVE_BYTESWAP_H) + +// gcc 4.3 and later provides __builtin_bswap32 and __builtin_bswap64. + +#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) +#undef bswap_32 +#define bswap_32 __builtin_bswap32 +#undef bswap_64 +#define bswap_64 __builtin_bswap64 +#endif namespace elfcpp { @@ -49,7 +95,13 @@ struct Endian { public: // Used for template specializations. - static const bool host_big_endian = __BYTE_ORDER == __BIG_ENDIAN; + static const bool host_big_endian = +#ifdef WORDS_BIGENDIAN + true +#else + false +#endif + ; }; // Valtype_base is a template based on size (8, 16, 32, 64) which |