diff options
Diffstat (limited to 'include/asm-generic/uaccess.h')
| -rw-r--r-- | include/asm-generic/uaccess.h | 58 |
1 files changed, 57 insertions, 1 deletions
diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h index b3d2241e03f8..e935318804f8 100644 --- a/include/asm-generic/uaccess.h +++ b/include/asm-generic/uaccess.h @@ -9,7 +9,63 @@ */ #include <linux/string.h> -#include <asm/segment.h> +#ifdef CONFIG_UACCESS_MEMCPY +static inline __must_check unsigned long +raw_copy_from_user(void *to, const void __user * from, unsigned long n) +{ + if (__builtin_constant_p(n)) { + switch(n) { + case 1: + *(u8 *)to = *(u8 __force *)from; + return 0; + case 2: + *(u16 *)to = *(u16 __force *)from; + return 0; + case 4: + *(u32 *)to = *(u32 __force *)from; + return 0; +#ifdef CONFIG_64BIT + case 8: + *(u64 *)to = *(u64 __force *)from; + return 0; +#endif + } + } + + memcpy(to, (const void __force *)from, n); + return 0; +} + +static inline __must_check unsigned long +raw_copy_to_user(void __user *to, const void *from, unsigned long n) +{ + if (__builtin_constant_p(n)) { + switch(n) { + case 1: + *(u8 __force *)to = *(u8 *)from; + return 0; + case 2: + *(u16 __force *)to = *(u16 *)from; + return 0; + case 4: + *(u32 __force *)to = *(u32 *)from; + return 0; +#ifdef CONFIG_64BIT + case 8: + *(u64 __force *)to = *(u64 *)from; + return 0; +#endif + default: + break; + } + } + + memcpy((void __force *)to, from, n); + return 0; +} +#define INLINE_COPY_FROM_USER +#define INLINE_COPY_TO_USER +#endif /* CONFIG_UACCESS_MEMCPY */ #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) |