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fundamental: split out unaligned_{read|write}_ne{16,32,64}() helpers into unaligned-fundamental.h

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Let's allow using this in code shared between userspace and EFI mode.

Also, don't implement these functions via endianness conversions given
we don't actually want to convert endianess here.
This commit is contained in:
Lennart Poettering
2022-12-07 18:10:42 +01:00
parent 17b296a118
commit d8007e7aac
2 changed files with 42 additions and 18 deletions
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20
src/basic/unaligned.h
View File

@@ -4,6 +4,8 @@
#include <endian.h>
#include <stdint.h>
#include "unaligned-fundamental.h"
/* BE */
static inline uint16_t unaligned_read_be16(const void *_u) {
@@ -79,21 +81,3 @@ static inline void unaligned_write_le64(void *_u, uint64_t a) {
u->x = le64toh(a);
}
#if __BYTE_ORDER == __BIG_ENDIAN
#define unaligned_read_ne16 unaligned_read_be16
#define unaligned_read_ne32 unaligned_read_be32
#define unaligned_read_ne64 unaligned_read_be64
#define unaligned_write_ne16 unaligned_write_be16
#define unaligned_write_ne32 unaligned_write_be32
#define unaligned_write_ne64 unaligned_write_be64
#else
#define unaligned_read_ne16 unaligned_read_le16
#define unaligned_read_ne32 unaligned_read_le32
#define unaligned_read_ne64 unaligned_read_le64
#define unaligned_write_ne16 unaligned_write_le16
#define unaligned_write_ne32 unaligned_write_le32
#define unaligned_write_ne64 unaligned_write_le64
#endif

40
src/fundamental/unaligned-fundamental.h Normal file
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@@ -0,0 +1,40 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stdint.h>
static inline uint16_t unaligned_read_ne16(const void *_u) {
const struct __attribute__((__packed__, __may_alias__)) { uint16_t x; } *u = _u;
return u->x;
}
static inline uint32_t unaligned_read_ne32(const void *_u) {
const struct __attribute__((__packed__, __may_alias__)) { uint32_t x; } *u = _u;
return u->x;
}
static inline uint64_t unaligned_read_ne64(const void *_u) {
const struct __attribute__((__packed__, __may_alias__)) { uint64_t x; } *u = _u;
return u->x;
}
static inline void unaligned_write_ne16(void *_u, uint16_t a) {
struct __attribute__((__packed__, __may_alias__)) { uint16_t x; } *u = _u;
u->x = a;
}
static inline void unaligned_write_ne32(void *_u, uint32_t a) {
struct __attribute__((__packed__, __may_alias__)) { uint32_t x; } *u = _u;
u->x = a;
}
static inline void unaligned_write_ne64(void *_u, uint64_t a) {
struct __attribute__((__packed__, __may_alias__)) { uint64_t x; } *u = _u;
u->x = a;
}