Vasily Gorbik | 8bfe273 | 2020-11-13 00:03:29 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | #ifndef _OBJTOOL_ENDIANNESS_H |
| 3 | #define _OBJTOOL_ENDIANNESS_H |
| 4 | |
Vasily Gorbik | 7786032 | 2020-11-13 00:03:32 +0100 | [diff] [blame] | 5 | #include <arch/endianness.h> |
Vasily Gorbik | 8bfe273 | 2020-11-13 00:03:29 +0100 | [diff] [blame] | 6 | #include <linux/kernel.h> |
| 7 | #include <endian.h> |
Vasily Gorbik | 8bfe273 | 2020-11-13 00:03:29 +0100 | [diff] [blame] | 8 | |
| 9 | #ifndef __TARGET_BYTE_ORDER |
| 10 | #error undefined arch __TARGET_BYTE_ORDER |
| 11 | #endif |
| 12 | |
| 13 | #if __BYTE_ORDER != __TARGET_BYTE_ORDER |
| 14 | #define __NEED_BSWAP 1 |
| 15 | #else |
| 16 | #define __NEED_BSWAP 0 |
| 17 | #endif |
| 18 | |
| 19 | /* |
| 20 | * Does a byte swap if target endianness doesn't match the host, i.e. cross |
| 21 | * compilation for little endian on big endian and vice versa. |
| 22 | * To be used for multi-byte values conversion, which are read from / about |
| 23 | * to be written to a target native endianness ELF file. |
| 24 | */ |
| 25 | #define bswap_if_needed(val) \ |
| 26 | ({ \ |
| 27 | __typeof__(val) __ret; \ |
| 28 | switch (sizeof(val)) { \ |
| 29 | case 8: __ret = __NEED_BSWAP ? bswap_64(val) : (val); break; \ |
| 30 | case 4: __ret = __NEED_BSWAP ? bswap_32(val) : (val); break; \ |
| 31 | case 2: __ret = __NEED_BSWAP ? bswap_16(val) : (val); break; \ |
| 32 | default: \ |
| 33 | BUILD_BUG(); break; \ |
| 34 | } \ |
| 35 | __ret; \ |
| 36 | }) |
| 37 | |
| 38 | #endif /* _OBJTOOL_ENDIANNESS_H */ |