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authorIan Lance Taylor <ian@airs.com>2009-03-02 02:45:29 +0000
committerIan Lance Taylor <ian@airs.com>2009-03-02 02:45:29 +0000
commit15d5fa160781daaf2e5c2b1d130f996a502016ea (patch)
treeb746bde2e4e7c6e1e2878ac6465ed2140d9185d7 /elfcpp/elfcpp_swap.h
parent3c54f1401bfc577f557a2a482647b19612b324ff (diff)
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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.h58
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