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#ifndef ENDIAN_H_
#define ENDIAN_H_
#include "common.h"
/*** Macros and functions for endian specific memory access ***/
/** byte-swapping functions **/
#if HAS_BUILTIN(bswap16)
#define bswap16 __builtin_bswap16
#else
static inline ushort
bswap16(ushort x) {
return x >> 8 | x << 8;
}
#endif
#if HAS_BUILTIN(bswap32)
#define bswap32 __builtin_bswap32
#else
static inline uint
bswap32(uint x) {
return x >> 24 & 0x000000FF | x >> 8 & 0x0000FF00
| x << 8 & 0x00FF0000 | x << 24 & 0xFF000000;
}
#endif
#if HAS_BUILTIN(bswap64)
#define bswap64 __builtin_bswap64
#else
static inline uvlong
bswap64(uvlong x) {
return (uvlong) bswap32(x) << 32 | bswap32(x >> 32);
}
#endif
#if (defined __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) || \
defined __hppa__ || defined __m68k__ || defined mc68000 || defined _M_M68K || \
(defined __MIPS__ && defined __MIPSEB__) || \
defined __ppc__ || defined __POWERPC__ || defined __powerpc__ || defined __PPC__ || \
defined __sparc__
#define HOST_BIG_ENDIAN
#define hostntarg_sameendian() (targ_bigendian)
#else
#define HOST_LIL_ENDIAN
#define hostntarg_sameendian() (!targ_bigendian)
#endif
/** little-endian memory writes **/
static inline void
wr16le(uchar *p, ushort x)
{
#ifndef HOST_LIL_ENDIAN
x = bswap16(x);
#endif
memcpy(p, &x, sizeof x);
}
static inline void
wr32le(uchar *p, uint x)
{
#ifndef HOST_LIL_ENDIAN
x = bswap32(x);
#endif
memcpy(p, &x, sizeof x);
}
static inline void
wr64le(uchar *p, uvlong x)
{
#ifndef HOST_LIL_ENDIAN
x = bswap64(x);
#endif
memcpy(p, &x, sizeof x);
}
/** big-endian memory writes **/
static inline void
wr16be(uchar *p, ushort x)
{
#ifndef HOST_BIG_ENDIAN
x = bswap16(x);
#endif
memcpy(p, &x, sizeof x);
}
static inline void
wr32be(uchar *p, uint x)
{
#ifndef HOST_BIG_ENDIAN
x = bswap32(x);
#endif
memcpy(p, &x, sizeof x);
}
static inline void
wr64be(uchar *p, uvlong x)
{
#ifndef HOST_BIG_ENDIAN
x = bswap64(x);
#endif
memcpy(p, &x, sizeof x);
}
/** target-endian memory writes **/
static inline void
wr16targ(uchar *p, ushort x)
{
if (!hostntarg_sameendian()) x = bswap16(x);
memcpy(p, &x, sizeof x);
}
static inline void
wr32targ(uchar *p, uint x)
{
if (!hostntarg_sameendian()) x = bswap32(x);
memcpy(p, &x, sizeof x);
}
static inline void
wr64targ(uchar *p, uvlong x)
{
if (!hostntarg_sameendian()) x = bswap64(x);
memcpy(p, &x, sizeof x);
}
#endif /* ENDIAN_H_ */
/* vim:set ts=3 sw=3 expandtab: */
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