// elfcpp_swap.h -- Handle swapping for elfcpp -*- C++ -*-
-// Copyright 2006, 2007, Free Software Foundation, Inc.
+// Copyright (C) 2006-2018 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of elfcpp.
#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
{
{
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
}
};
+// Swap_aligned32 is a template based on size and on whether the
+// target is big endian. It defines the type Valtype and the
+// functions readval and writeval. The functions read and write
+// values of the appropriate size out of buffers which may not be
+// 64-bit aligned, but are 32-bit aligned.
+
+template<int size, bool big_endian>
+struct Swap_aligned32
+{
+ typedef typename Valtype_base<size>::Valtype Valtype;
+
+ static inline Valtype
+ readval(const unsigned char* wv)
+ { return Swap<size, big_endian>::readval(
+ reinterpret_cast<const Valtype*>(wv)); }
+
+ static inline void
+ writeval(unsigned char* wv, Valtype v)
+ { Swap<size, big_endian>::writeval(reinterpret_cast<Valtype*>(wv), v); }
+};
+
+template<>
+struct Swap_aligned32<64, true>
+{
+ typedef Valtype_base<64>::Valtype Valtype;
+
+ static inline Valtype
+ readval(const unsigned char* wv)
+ {
+ return ((static_cast<Valtype>(Swap<32, true>::readval(wv)) << 32)
+ | static_cast<Valtype>(Swap<32, true>::readval(wv + 4)));
+ }
+
+ static inline void
+ writeval(unsigned char* wv, Valtype v)
+ {
+ typedef Valtype_base<32>::Valtype Valtype32;
+
+ Swap<32, true>::writeval(wv, static_cast<Valtype32>(v >> 32));
+ Swap<32, true>::writeval(wv + 4, static_cast<Valtype32>(v));
+ }
+};
+
+template<>
+struct Swap_aligned32<64, false>
+{
+ typedef Valtype_base<64>::Valtype Valtype;
+
+ static inline Valtype
+ readval(const unsigned char* wv)
+ {
+ return ((static_cast<Valtype>(Swap<32, false>::readval(wv + 4)) << 32)
+ | static_cast<Valtype>(Swap<32, false>::readval(wv)));
+ }
+
+ static inline void
+ writeval(unsigned char* wv, Valtype v)
+ {
+ typedef Valtype_base<32>::Valtype Valtype32;
+
+ Swap<32, false>::writeval(wv + 4, static_cast<Valtype32>(v >> 32));
+ Swap<32, false>::writeval(wv, static_cast<Valtype32>(v));
+ }
+};
+
} // End namespace elfcpp.
#endif // !defined(ELFCPP_SWAP_H)