Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 1 | /* |
| 2 | * linux/byteorder/swab.h |
| 3 | * Byte-swapping, independently from CPU endianness |
| 4 | * swabXX[ps]?(foo) |
| 5 | * |
| 6 | * Francois-Rene Rideau <fare@tunes.org> 19971205 |
| 7 | * separated swab functions from cpu_to_XX, |
| 8 | * to clean up support for bizarre-endian architectures. |
| 9 | * |
Martin Roth | 0cb07e3 | 2013-07-09 21:46:01 -0600 | [diff] [blame] | 10 | * See asm-i386/byteorder.h and such for examples of how to provide |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 11 | * architecture-dependent optimized versions |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | /* casts are necessary for constants, because we never know how for sure |
| 16 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
| 17 | */ |
Elyes HAOUAS | c4e4193 | 2018-11-01 11:29:50 +0100 | [diff] [blame] | 18 | |
| 19 | #ifndef _SWAB_H |
| 20 | #define _SWAB_H |
| 21 | |
| 22 | #include <stdint.h> |
| 23 | |
Arthur Heymans | 1cb9cd5 | 2019-11-28 16:05:08 +0100 | [diff] [blame] | 24 | #if ENV_ARMV4 |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 25 | #define swab16(x) \ |
| 26 | ((unsigned short)( \ |
| 27 | (((unsigned short)(x) & (unsigned short)0x00ffU) << 8) | \ |
Lee Leahy | 91d1e76 | 2017-03-07 14:31:19 -0800 | [diff] [blame] | 28 | (((unsigned short)(x) & (unsigned short)0xff00U) >> 8))) |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 29 | |
| 30 | #define swab32(x) \ |
| 31 | ((unsigned int)( \ |
Lee Leahy | b7e692e | 2017-03-07 15:57:05 -0800 | [diff] [blame] | 32 | (((unsigned int)(x) & 0x000000ffUL) << 24) | \ |
| 33 | (((unsigned int)(x) & 0x0000ff00UL) << 8) | \ |
| 34 | (((unsigned int)(x) & 0x00ff0000UL) >> 8) | \ |
| 35 | (((unsigned int)(x) & 0xff000000UL) >> 24))) |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 36 | |
Stefan Reinauer | 9ea33e9 | 2011-10-14 15:11:16 -0700 | [diff] [blame] | 37 | #define swab64(x) \ |
| 38 | ((uint64_t)( \ |
| 39 | (((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \ |
| 40 | (((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \ |
| 41 | (((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \ |
| 42 | (((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \ |
| 43 | (((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \ |
| 44 | (((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \ |
| 45 | (((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \ |
Lee Leahy | 91d1e76 | 2017-03-07 14:31:19 -0800 | [diff] [blame] | 46 | (((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56))) |
Arthur Heymans | 1cb9cd5 | 2019-11-28 16:05:08 +0100 | [diff] [blame] | 47 | #else /* ENV_ARMV4 */ |
Julius Werner | 879ea7f | 2019-11-28 12:53:43 -0800 | [diff] [blame] | 48 | #define swab16(x) ((uint16_t)__builtin_bswap16(x)) |
| 49 | #define swab32(x) ((uint32_t)__builtin_bswap32(x)) |
| 50 | #define swab64(x) ((uint64_t)__builtin_bswap64(x)) |
Arthur Heymans | 1cb9cd5 | 2019-11-28 16:05:08 +0100 | [diff] [blame] | 51 | #endif /* !ENV_ARMV4 */ |
Stefan Reinauer | 9ea33e9 | 2011-10-14 15:11:16 -0700 | [diff] [blame] | 52 | |
Greg Watson | 4f566ca | 2004-03-13 03:37:11 +0000 | [diff] [blame] | 53 | #endif /* _SWAB_H */ |