| Stefan Roese | 371abe8 | 2009-03-19 15:34:56 +0100 | [diff] [blame] | 1 | #ifndef _LINUX_UNALIGNED_GENERIC_H |
| 2 | #define _LINUX_UNALIGNED_GENERIC_H |
| 3 | |
| Stefan Roese | 371abe8 | 2009-03-19 15:34:56 +0100 | [diff] [blame] | 4 | /* |
| 5 | * Cause a link-time error if we try an unaligned access other than |
| 6 | * 1,2,4 or 8 bytes long |
| 7 | */ |
| 8 | extern void __bad_unaligned_access_size(void); |
| 9 | |
| 10 | #define __get_unaligned_le(ptr) ((__force typeof(*(ptr)))({ \ |
| 11 | __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \ |
| 12 | __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_le16((ptr)), \ |
| 13 | __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_le32((ptr)), \ |
| 14 | __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_le64((ptr)), \ |
| 15 | __bad_unaligned_access_size())))); \ |
| 16 | })) |
| 17 | |
| 18 | #define __get_unaligned_be(ptr) ((__force typeof(*(ptr)))({ \ |
| 19 | __builtin_choose_expr(sizeof(*(ptr)) == 1, *(ptr), \ |
| 20 | __builtin_choose_expr(sizeof(*(ptr)) == 2, get_unaligned_be16((ptr)), \ |
| 21 | __builtin_choose_expr(sizeof(*(ptr)) == 4, get_unaligned_be32((ptr)), \ |
| 22 | __builtin_choose_expr(sizeof(*(ptr)) == 8, get_unaligned_be64((ptr)), \ |
| 23 | __bad_unaligned_access_size())))); \ |
| 24 | })) |
| 25 | |
| 26 | #define __put_unaligned_le(val, ptr) ({ \ |
| 27 | void *__gu_p = (ptr); \ |
| 28 | switch (sizeof(*(ptr))) { \ |
| 29 | case 1: \ |
| 30 | *(u8 *)__gu_p = (__force u8)(val); \ |
| 31 | break; \ |
| 32 | case 2: \ |
| 33 | put_unaligned_le16((__force u16)(val), __gu_p); \ |
| 34 | break; \ |
| 35 | case 4: \ |
| 36 | put_unaligned_le32((__force u32)(val), __gu_p); \ |
| 37 | break; \ |
| 38 | case 8: \ |
| 39 | put_unaligned_le64((__force u64)(val), __gu_p); \ |
| 40 | break; \ |
| 41 | default: \ |
| 42 | __bad_unaligned_access_size(); \ |
| 43 | break; \ |
| 44 | } \ |
| 45 | (void)0; }) |
| 46 | |
| 47 | #define __put_unaligned_be(val, ptr) ({ \ |
| 48 | void *__gu_p = (ptr); \ |
| 49 | switch (sizeof(*(ptr))) { \ |
| 50 | case 1: \ |
| 51 | *(u8 *)__gu_p = (__force u8)(val); \ |
| 52 | break; \ |
| 53 | case 2: \ |
| 54 | put_unaligned_be16((__force u16)(val), __gu_p); \ |
| 55 | break; \ |
| 56 | case 4: \ |
| 57 | put_unaligned_be32((__force u32)(val), __gu_p); \ |
| 58 | break; \ |
| 59 | case 8: \ |
| 60 | put_unaligned_be64((__force u64)(val), __gu_p); \ |
| 61 | break; \ |
| 62 | default: \ |
| 63 | __bad_unaligned_access_size(); \ |
| 64 | break; \ |
| 65 | } \ |
| 66 | (void)0; }) |
| 67 | |
| 68 | #endif /* _LINUX_UNALIGNED_GENERIC_H */ |