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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>
This commit is contained in:
Michal Simek 2010-03-22 16:02:59 +01:00
parent 40e11e3380
commit 527bdb52d5
1 changed files with 36 additions and 45 deletions
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81
arch/microblaze/include/asm/uaccess.h
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@ -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))