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authorMichal Simek <monstr@monstr.eu>2010-03-22 16:02:59 +0100
committerMichal Simek <monstr@monstr.eu>2010-04-01 08:38:21 +0200
commit527bdb52d50ddbc8dd64369e464d7a08bc7eb83c (patch)
treede24a85c279042092b55d2e2fe5263d76a20a6c2 /arch/microblaze
parent40e11e3380d4bd14bb3d85c7e7b863075a6a8d86 (diff)
microblaze: uaccess: fix clear_user for noMMU kernel
Previous patches fixed only MMU version and this is the first patch for noMMU kernel Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/include/asm/uaccess.h81
1 files changed, 36 insertions, 45 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index fe954b394fd..1af92025fff 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))