diff options
| -rw-r--r-- | arch/microblaze/include/asm/uaccess.h | 81 |
1 files changed, 36 insertions, 45 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h index fe954b394fdc..1af92025fff9 100644 --- a/arch/microblaze/include/asm/uaccess.h +++ b/arch/microblaze/include/asm/uaccess.h @@ -71,6 +71,9 @@ struct exception_table_entry { unsigned long insn, fixup; }; +/* Returns 0 if exception not found and fixup otherwise. */ +extern unsigned long search_exception_table(unsigned long); + #ifndef CONFIG_MMU /* Check against bounds of physical memory */ @@ -108,6 +111,39 @@ static inline int ___range_ok(unsigned long addr, unsigned long size) # define __EX_TABLE_SECTION ".section .discard,\"a\"\n" #endif +extern unsigned long __copy_tofrom_user(void __user *to, + const void __user *from, unsigned long size); + +/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */ +static inline unsigned long __must_check __clear_user(void __user *to, + unsigned long n) +{ + /* normal memset with two words to __ex_table */ + __asm__ __volatile__ ( \ + "1: sb r0, %2, r0;" \ + " addik %0, %0, -1;" \ + " bneid %0, 1b;" \ + " addik %2, %2, 1;" \ + "2: " \ + __EX_TABLE_SECTION \ + ".word 1b,2b;" \ + ".previous;" \ + : "=r"(n) \ + : "0"(n), "r"(to) + ); + return n; +} + +static inline unsigned long __must_check clear_user(void __user *to, + unsigned long n) +{ + might_sleep(); + if (unlikely(!access_ok(VERIFY_WRITE, to, n))) + return n; + + return __clear_user(to, n); +} + #ifndef CONFIG_MMU /* Undefined function to trigger linker error */ @@ -173,53 +209,11 @@ extern int bad_user_access_length(void); #define __copy_from_user_inatomic(to, from, n) \ (__copy_from_user((to), (from), (n))) -#define __clear_user(addr, n) (memset((void *)(addr), 0, (n)), 0) - -/* stejne s MMU */ -static inline unsigned long clear_user(void *addr, unsigned long size) -{ - if (access_ok(VERIFY_WRITE, addr, size)) - size = __clear_user(addr, size); - return size; -} - -/* Returns 0 if exception not found and fixup otherwise. */ -extern unsigned long search_exception_table(unsigned long); - extern long strncpy_from_user(char *dst, const char *src, long count); extern long strnlen_user(const char *src, long count); #else /* CONFIG_MMU */ -/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */ -static inline unsigned long __must_check __clear_user(void __user *to, - unsigned long n) -{ - /* normal memset with two words to __ex_table */ - __asm__ __volatile__ ( \ - "1: sb r0, %2, r0;" \ - " addik %0, %0, -1;" \ - " bneid %0, 1b;" \ - " addik %2, %2, 1;" \ - "2: " \ - __EX_TABLE_SECTION \ - ".word 1b,2b;" \ - ".previous;" \ - : "=r"(n) \ - : "0"(n), "r"(to) - ); - return n; -} - -static inline unsigned long __must_check clear_user(void __user *to, - unsigned long n) -{ - might_sleep(); - if (unlikely(!access_ok(VERIFY_WRITE, to, n))) - return n; - return __clear_user(to, n); -} - /* put_user and get_user macros */ extern long __user_bad(void); @@ -372,9 +366,6 @@ extern long __user_bad(void); ? __put_user((x), (ptr)) : -EFAULT; \ }) -extern unsigned long __copy_tofrom_user(void __user *to, - const void __user *from, unsigned long size); - #define __copy_from_user(to, from, n) \ __copy_tofrom_user((__force void __user *)(to), \ (void __user *)(from), (n)) |
