b61e5f171c
on some architectures such as MIPS there are special unaligned load/store sequences, instead of having to do bitwise accesses https://www.linux-mips.org/wiki/Alignment
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2014 Tom Gundersen
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <endian.h>
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#include <stdint.h>
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/* BE */
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static inline uint16_t unaligned_read_be16(const void *_u) {
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const struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
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return be16toh(u->x);
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}
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static inline uint32_t unaligned_read_be32(const void *_u) {
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const struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
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return be32toh(u->x);
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}
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static inline uint64_t unaligned_read_be64(const void *_u) {
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const struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
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return be64toh(u->x);
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}
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static inline void unaligned_write_be16(void *_u, uint16_t a) {
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struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
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u->x = be16toh(a);
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}
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static inline void unaligned_write_be32(void *_u, uint32_t a) {
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struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
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u->x = be32toh(a);
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}
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static inline void unaligned_write_be64(void *_u, uint64_t a) {
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struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
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u->x = be64toh(a);
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}
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/* LE */
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static inline uint16_t unaligned_read_le16(const void *_u) {
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const struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
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return le16toh(u->x);
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}
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static inline uint32_t unaligned_read_le32(const void *_u) {
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const struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
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return le32toh(u->x);
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}
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static inline uint64_t unaligned_read_le64(const void *_u) {
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const struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
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return le64toh(u->x);
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}
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static inline void unaligned_write_le16(void *_u, uint16_t a) {
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struct __attribute__((packed, may_alias)) { uint16_t x; } *u = _u;
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u->x = le16toh(a);
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}
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static inline void unaligned_write_le32(void *_u, uint32_t a) {
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struct __attribute__((packed, may_alias)) { uint32_t x; } *u = _u;
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u->x = le32toh(a);
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}
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static inline void unaligned_write_le64(void *_u, uint64_t a) {
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struct __attribute__((packed, may_alias)) { uint64_t x; } *u = _u;
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u->x = le64toh(a);
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}
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define unaligned_read_ne16 unaligned_read_be16
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#define unaligned_read_ne32 unaligned_read_be32
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#define unaligned_read_ne64 unaligned_read_be64
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#define unaligned_write_ne16 unaligned_write_be16
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#define unaligned_write_ne32 unaligned_write_be32
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#define unaligned_write_ne64 unaligned_write_be64
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#else
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#define unaligned_read_ne16 unaligned_read_le16
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#define unaligned_read_ne32 unaligned_read_le32
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#define unaligned_read_ne64 unaligned_read_le64
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#define unaligned_write_ne16 unaligned_write_le16
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#define unaligned_write_ne32 unaligned_write_le32
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#define unaligned_write_ne64 unaligned_write_le64
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#endif
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