diff options
Diffstat (limited to 'include/asm-mn10300/unaligned.h')
| -rw-r--r-- | include/asm-mn10300/unaligned.h | 130 |
1 files changed, 7 insertions, 123 deletions
diff --git a/include/asm-mn10300/unaligned.h b/include/asm-mn10300/unaligned.h index cad3afbd035f..0df671318ae4 100644 --- a/include/asm-mn10300/unaligned.h +++ b/include/asm-mn10300/unaligned.h @@ -8,129 +8,13 @@ * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ -#ifndef _ASM_UNALIGNED_H -#define _ASM_UNALIGNED_H +#ifndef _ASM_MN10300_UNALIGNED_H +#define _ASM_MN10300_UNALIGNED_H -#include <asm/types.h> +#include <linux/unaligned/access_ok.h> +#include <linux/unaligned/generic.h> -#if 0 -extern int __bug_unaligned_x(void *ptr); +#define get_unaligned __get_unaligned_le +#define put_unaligned __put_unaligned_le -/* - * What is the most efficient way of loading/storing an unaligned value? - * - * That is the subject of this file. Efficiency here is defined as - * minimum code size with minimum register usage for the common cases. - * It is currently not believed that long longs are common, so we - * trade efficiency for the chars, shorts and longs against the long - * longs. - * - * Current stats with gcc 2.7.2.2 for these functions: - * - * ptrsize get: code regs put: code regs - * 1 1 1 1 2 - * 2 3 2 3 2 - * 4 7 3 7 3 - * 8 20 6 16 6 - * - * gcc 2.95.1 seems to code differently: - * - * ptrsize get: code regs put: code regs - * 1 1 1 1 2 - * 2 3 2 3 2 - * 4 7 4 7 4 - * 8 19 8 15 6 - * - * which may or may not be more efficient (depending upon whether - * you can afford the extra registers). Hopefully the gcc 2.95 - * is inteligent enough to decide if it is better to use the - * extra register, but evidence so far seems to suggest otherwise. - * - * Unfortunately, gcc is not able to optimise the high word - * out of long long >> 32, or the low word from long long << 32 - */ - -#define __get_unaligned_2(__p) \ - (__p[0] | __p[1] << 8) - -#define __get_unaligned_4(__p) \ - (__p[0] | __p[1] << 8 | __p[2] << 16 | __p[3] << 24) - -#define get_unaligned(ptr) \ -({ \ - unsigned int __v1, __v2; \ - __typeof__(*(ptr)) __v; \ - __u8 *__p = (__u8 *)(ptr); \ - \ - switch (sizeof(*(ptr))) { \ - case 1: __v = *(ptr); break; \ - case 2: __v = __get_unaligned_2(__p); break; \ - case 4: __v = __get_unaligned_4(__p); break; \ - case 8: \ - __v2 = __get_unaligned_4((__p+4)); \ - __v1 = __get_unaligned_4(__p); \ - __v = ((unsigned long long)__v2 << 32 | __v1); \ - break; \ - default: __v = __bug_unaligned_x(__p); break; \ - } \ - __v; \ -}) - - -static inline void __put_unaligned_2(__u32 __v, register __u8 *__p) -{ - *__p++ = __v; - *__p++ = __v >> 8; -} - -static inline void __put_unaligned_4(__u32 __v, register __u8 *__p) -{ - __put_unaligned_2(__v >> 16, __p + 2); - __put_unaligned_2(__v, __p); -} - -static inline void __put_unaligned_8(const unsigned long long __v, __u8 *__p) -{ - /* - * tradeoff: 8 bytes of stack for all unaligned puts (2 - * instructions), or an extra register in the long long - * case - go for the extra register. - */ - __put_unaligned_4(__v >> 32, __p + 4); - __put_unaligned_4(__v, __p); -} - -/* - * Try to store an unaligned value as efficiently as possible. - */ -#define put_unaligned(val, ptr) \ - ({ \ - switch (sizeof(*(ptr))) { \ - case 1: \ - *(ptr) = (val); \ - break; \ - case 2: \ - __put_unaligned_2((val), (__u8 *)(ptr)); \ - break; \ - case 4: \ - __put_unaligned_4((val), (__u8 *)(ptr)); \ - break; \ - case 8: \ - __put_unaligned_8((val), (__u8 *)(ptr)); \ - break; \ - default: \ - __bug_unaligned_x(ptr); \ - break; \ - } \ - (void) 0; \ - }) - - -#else - -#define get_unaligned(ptr) (*(ptr)) -#define put_unaligned(val, ptr) ({ *(ptr) = (val); (void) 0; }) - -#endif - -#endif +#endif /* _ASM_MN10300_UNALIGNED_H */ |