Differential D14316 Diff 75514 tools/build/cross-build/include/linux/sys/endian.h

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tools/build/cross-build/include/linux/sys/endian.h

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				/*-
				* 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));
				}