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tools/build/cross-build/include/linux/sys/endian.h
- This file was added.
/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause | |||||
* | |||||
* Copyright 2018-2020 Alex Richardson <arichardson@FreeBSD.org> | |||||
* | |||||
* This software was developed by SRI International and the University of | |||||
* Cambridge Computer Laboratory (Department of Computer Science and | |||||
* Technology) under DARPA contract HR0011-18-C-0016 ("ECATS"), as part of the | |||||
* DARPA SSITH research programme. | |||||
* | |||||
* This software was developed by SRI International and the University of | |||||
* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) | |||||
* ("CTSRD"), as part of the DARPA CRASH research programme. | |||||
* | |||||
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. | |||||
*/ | |||||
#pragma once | |||||
#if __has_include_next(<sys/endian.h>) | |||||
#include_next <sys/endian.h> | |||||
#endif | |||||
#if __has_include(<endian.h>) | |||||
#include <endian.h> | |||||
#endif | |||||
/* Linux uses a double underscore, FreeBSD a single one */ | |||||
#define _LITTLE_ENDIAN __LITTLE_ENDIAN | |||||
#define _BIG_ENDIAN __BIG_ENDIAN | |||||
#define _BYTE_ORDER __BYTE_ORDER | |||||
/* | |||||
* Ensure all these are constant expressions (which is not the case for some | |||||
* of the glibc versions depending on compiler optimization level) | |||||
*/ | |||||
#undef bswap64 | |||||
#define bswap64(a) __builtin_bswap64(a) | |||||
#undef bswap32 | |||||
#define bswap32(a) __builtin_bswap32(a) | |||||
#undef bswap16 | |||||
#define bswap16(a) __builtin_bswap16(a) | |||||
#undef __bswap_64 | |||||
#define __bswap_64(a) __builtin_bswap64(a) | |||||
#undef __bswap_32 | |||||
#define __bswap_32(a) __builtin_bswap32(a) | |||||
#undef __bswap_16 | |||||
#define __bswap_16(a) __builtin_bswap16(a) | |||||
/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */ | |||||
static __inline uint16_t | |||||
be16dec(const void *pp) | |||||
{ | |||||
uint8_t const *p = (uint8_t const *)pp; | |||||
return ((p[0] << 8) | p[1]); | |||||
} | |||||
static __inline uint32_t | |||||
be32dec(const void *pp) | |||||
{ | |||||
uint8_t const *p = (uint8_t const *)pp; | |||||
return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]); | |||||
} | |||||
static __inline uint64_t | |||||
be64dec(const void *pp) | |||||
{ | |||||
uint8_t const *p = (uint8_t const *)pp; | |||||
return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4)); | |||||
} | |||||
static __inline uint16_t | |||||
le16dec(const void *pp) | |||||
{ | |||||
uint8_t const *p = (uint8_t const *)pp; | |||||
return ((p[1] << 8) | p[0]); | |||||
} | |||||
static __inline uint32_t | |||||
le32dec(const void *pp) | |||||
{ | |||||
uint8_t const *p = (uint8_t const *)pp; | |||||
return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); | |||||
} | |||||
static __inline uint64_t | |||||
le64dec(const void *pp) | |||||
{ | |||||
uint8_t const *p = (uint8_t const *)pp; | |||||
return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p)); | |||||
} | |||||
static __inline void | |||||
be16enc(void *pp, uint16_t u) | |||||
{ | |||||
uint8_t *p = (uint8_t *)pp; | |||||
p[0] = (u >> 8) & 0xff; | |||||
p[1] = u & 0xff; | |||||
} | |||||
static __inline void | |||||
be32enc(void *pp, uint32_t u) | |||||
{ | |||||
uint8_t *p = (uint8_t *)pp; | |||||
p[0] = (u >> 24) & 0xff; | |||||
p[1] = (u >> 16) & 0xff; | |||||
p[2] = (u >> 8) & 0xff; | |||||
p[3] = u & 0xff; | |||||
} | |||||
static __inline void | |||||
be64enc(void *pp, uint64_t u) | |||||
{ | |||||
uint8_t *p = (uint8_t *)pp; | |||||
be32enc(p, (uint32_t)(u >> 32)); | |||||
be32enc(p + 4, (uint32_t)(u & 0xffffffffU)); | |||||
} | |||||
static __inline void | |||||
le16enc(void *pp, uint16_t u) | |||||
{ | |||||
uint8_t *p = (uint8_t *)pp; | |||||
p[0] = u & 0xff; | |||||
p[1] = (u >> 8) & 0xff; | |||||
} | |||||
static __inline void | |||||
le32enc(void *pp, uint32_t u) | |||||
{ | |||||
uint8_t *p = (uint8_t *)pp; | |||||
p[0] = u & 0xff; | |||||
p[1] = (u >> 8) & 0xff; | |||||
p[2] = (u >> 16) & 0xff; | |||||
p[3] = (u >> 24) & 0xff; | |||||
} | |||||
static __inline void | |||||
le64enc(void *pp, uint64_t u) | |||||
{ | |||||
uint8_t *p = (uint8_t *)pp; | |||||
le32enc(p, (uint32_t)(u & 0xffffffffU)); | |||||
le32enc(p + 4, (uint32_t)(u >> 32)); | |||||
} |