/* $OpenBSD: endian.h,v 1.17 2006/01/06 18:53:05 millert Exp $ */
/*-
* Copyright (c) 1997 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Generic definitions for little- and big-endian systems. Other endianesses
* has to be dealt with in the specific machine/endian.h file for that port.
*
* This file is meant to be included from a little- or big-endian port's
* machine/endian.h after setting _BYTE_ORDER to either 1234 for little endian
* or 4321 for big..
*/
#ifndef _SYS_ENDIAN_H_
#define _SYS_ENDIAN_H_
#include <sys/cdefs.h>
#include <machine/endian.h>
#include <machine/_types.h>
#define _LITTLE_ENDIAN 1234
#define _BIG_ENDIAN 4321
#define _PDP_ENDIAN 3412
#if __BSD_VISIBLE
#define LITTLE_ENDIAN _LITTLE_ENDIAN
#define BIG_ENDIAN _BIG_ENDIAN
#define PDP_ENDIAN _PDP_ENDIAN
#define BYTE_ORDER _BYTE_ORDER
#endif
#ifdef __GNUC__
#define __swap16gen(x) __statement({ \
__uint16_t __swap16gen_x = (x); \
\
(__uint16_t)((__swap16gen_x & 0xff) << 8 | \
(__swap16gen_x & 0xff00) >> 8); \
})
#define __swap32gen(x) __statement({ \
__uint32_t __swap32gen_x = (x); \
\
(__uint32_t)((__swap32gen_x & 0xff) << 24 | \
(__swap32gen_x & 0xff00) << 8 | \
(__swap32gen_x & 0xff0000) >> 8 | \
(__swap32gen_x & 0xff000000) >> 24); \
})
#define __swap64gen(x) __statement({ \
__uint64_t __swap64gen_x = (x); \
\
(__uint64_t)((__swap64gen_x & 0xff) << 56 | \
(__swap64gen_x & 0xff00ULL) << 40 | \
(__swap64gen_x & 0xff0000ULL) << 24 | \
(__swap64gen_x & 0xff000000ULL) << 8 | \
(__swap64gen_x & 0xff00000000ULL) >> 8 | \
(__swap64gen_x & 0xff0000000000ULL) >> 24 | \
(__swap64gen_x & 0xff000000000000ULL) >> 40 | \
(__swap64gen_x & 0xff00000000000000ULL) >> 56); \
})
#else /* __GNUC__ */
/* Note that these macros evaluate their arguments several times. */
#define __swap16gen(x) \
(__uint16_t)(((__uint16_t)(x) & 0xff) << 8 | ((__uint16_t)(x) & 0xff00) >> 8)
#define __swap32gen(x) \
(__uint32_t)(((__uint32_t)(x) & 0xff) << 24 | \
((__uint32_t)(x) & 0xff00) << 8 | ((__uint32_t)(x) & 0xff0000) >> 8 |\
((__uint32_t)(x) & 0xff000000) >> 24)
#define __swap64gen(x) \
(__uint64_t)((((__uint64_t)(x) & 0xff) << 56) | \
((__uint64_t)(x) & 0xff00ULL) << 40 | \
((__uint64_t)(x) & 0xff0000ULL) << 24 | \
((__uint64_t)(x) & 0xff000000ULL) << 8 | \
((__uint64_t)(x) & 0xff00000000ULL) >> 8 | \
((__uint64_t)(x) & 0xff0000000000ULL) >> 24 | \
((__uint64_t)(x) & 0xff000000000000ULL) >> 40 | \
((__uint64_t)(x) & 0xff00000000000000ULL) >> 56)
#endif /* __GNUC__ */
/*
* Define MD_SWAP if you provide swap{16,32}md functions/macros that are
* optimized for your architecture, These will be used for swap{16,32}
* unless the argument is a constant and we are using GCC, where we can
* take advantage of the CSE phase much better by using the generic version.
*/
#ifdef MD_SWAP
#if __GNUC__
#define __swap16(x) __statement({ \
__uint16_t __swap16_x = (x); \
\
__builtin_constant_p(x) ? __swap16gen(__swap16_x) : \
__swap16md(__swap16_x); \
})
#define __swap32(x) __statement({ \
__uint32_t __swap32_x = (x); \
\
__builtin_constant_p(x) ? __swap32gen(__swap32_x) : \
__swap32md(__swap32_x); \
})
#define __swap64(x) __statement({ \
__uint64_t __swap64_x = (x); \
\
__builtin_constant_p(x) ? __swap64gen(__swap64_x) : \
__swap64md(__swap64_x); \
})
#endif /* __GNUC__ */
#else /* MD_SWAP */
#define __swap16 __swap16gen
#define __swap32 __swap32gen
#define __swap64 __swap64gen
#endif /* MD_SWAP */
#define __swap16_multi(v, n) do { \
__size_t __swap16_multi_n = (n); \
__uint16_t *__swap16_multi_v = (v); \
\
while (__swap16_multi_n) { \
*__swap16_multi_v = swap16(*__swap16_multi_v); \
__swap16_multi_v++; \
__swap16_multi_n--; \
} \
} while (0)
#if __BSD_VISIBLE
#define swap16 __swap16
#define swap32 __swap32
#define swap64 __swap64
#define swap16_multi __swap16_multi
#endif /* __BSD_VISIBLE */
#if _BYTE_ORDER == _LITTLE_ENDIAN
/* Can be overridden by machine/endian.h before inclusion of this file. */
#ifndef _QUAD_HIGHWORD
#define _QUAD_HIGHWORD 1
#endif
#ifndef _QUAD_LOWWORD
#define _QUAD_LOWWORD 0
#endif
#if __BSD_VISIBLE
#define htobe16 __swap16
#define htobe32 __swap32
#define htobe64 __swap64
#define betoh16 __swap16
#define betoh32 __swap32
#define betoh64 __swap64
#define htole16(x) (x)
#define htole32(x) (x)
#define htole64(x) (x)
#define letoh16(x) (x)
#define letoh32(x) (x)
#define letoh64(x) (x)
#endif /* __BSD_VISIBLE */
#define htons(x) __swap16(x)
#define htonl(x) __swap32(x)
#define ntohs(x) __swap16(x)
#define ntohl(x) __swap32(x)
/* Bionic additions */
#define ntohq(x) __swap64(x)
#define htonq(x) __swap64(x)
#define __LITTLE_ENDIAN_BITFIELD
#endif /* _BYTE_ORDER */
#if _BYTE_ORDER == _BIG_ENDIAN
/* Can be overridden by machine/endian.h before inclusion of this file. */
#ifndef _QUAD_HIGHWORD
#define _QUAD_HIGHWORD 0
#endif
#ifndef _QUAD_LOWWORD
#define _QUAD_LOWWORD 1
#endif
#if __BSD_VISIBLE
#define htole16 __swap16
#define htole32 __swap32
#define htole64 __swap64
#define letoh16 __swap16
#define letoh32 __swap32
#define letoh64 __swap64
#define htobe16(x) (x)
#define htobe32(x) (x)
#define htobe64(x) (x)
#define betoh16(x) (x)
#define betoh32(x) (x)
#define betoh64(x) (x)
#endif /* __BSD_VISIBLE */
#define htons(x) (x)
#define htonl(x) (x)
#define ntohs(x) (x)
#define ntohl(x) (x)
/* Bionic additions */
#define ntohq(x) (x)
#define htonq(x) (x)
#define __BIG_ENDIAN_BITFIELD
#endif /* _BYTE_ORDER */
#if __BSD_VISIBLE
#define NTOHL(x) (x) = ntohl((u_int32_t)(x))
#define NTOHS(x) (x) = ntohs((u_int16_t)(x))
#define HTONL(x) (x) = htonl((u_int32_t)(x))
#define HTONS(x) (x) = htons((u_int16_t)(x))
#endif
#define __BYTE_ORDER _BYTE_ORDER
#ifndef __LITTLE_ENDIAN
#define __LITTLE_ENDIAN _LITTLE_ENDIAN
#endif
#ifndef __BIG_ENDIAN
#define __BIG_ENDIAN _BIG_ENDIAN
#endif
#ifdef __BSD_VISIBLE
/*
* glibc-compatible beXXtoh/leXXtoh synonyms for htobeXX/htoleXX.
* The BSDs export both sets of names, bionic historically only
* exported the ones above (or on the rhs here), and glibc only
* exports these names (on the lhs).
*/
#define be16toh(x) htobe16(x)
#define be32toh(x) htobe32(x)
#define be64toh(x) htobe64(x)
#define le16toh(x) htole16(x)
#define le32toh(x) htole32(x)
#define le64toh(x) htole64(x)
#endif
#endif /* _SYS_ENDIAN_H_ */