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microblaze: uaccess: Fix get_user macro for noMMU

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Use unified version.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2010-03-08 10:52:24 +01:00
parent 527bdb52d5
commit 3a6d77245e
1 changed files with 66 additions and 23 deletions
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89
arch/microblaze/include/asm/uaccess.h
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@ -146,31 +146,75 @@ static inline unsigned long __must_check clear_user(void __user *to,
#ifndef CONFIG_MMU
/* Undefined function to trigger linker error */
extern int bad_user_access_length(void);
extern long __user_bad(void);
/* FIXME this is function for optimalization -> memcpy */
#define __get_user(var, ptr) \
({ \
int __gu_err = 0; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
(var) = *(ptr); \
break; \
case 8: \
memcpy((void *) &(var), (ptr), 8); \
break; \
default: \
(var) = 0; \
__gu_err = __get_user_bad(); \
break; \
} \
__gu_err; \
#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
({ \
__asm__ __volatile__ ( \
"1:" insn " %1, %2, r0;" \
" addk %0, r0, r0;" \
"2: " \
__FIXUP_SECTION \
"3: brid 2b;" \
" addik %0, r0, %3;" \
".previous;" \
__EX_TABLE_SECTION \
".word 1b,3b;" \
".previous;" \
: "=&r"(__gu_err), "=r"(__gu_val) \
: "r"(__gu_ptr), "i"(-EFAULT) \
); \
})
#define __get_user_bad() (bad_user_access_length(), (-EFAULT))
/**
* get_user: - Get a simple variable from user space.
* @x: Variable to store result.
* @ptr: Source address, in user space.
*
* Context: User context only. This function may sleep.
*
* This macro copies a single simple variable from user space to kernel
* space. It supports simple types like char and int, but not larger
* data types like structures or arrays.
*
* @ptr must have pointer-to-simple-variable type, and the result of
* dereferencing @ptr must be assignable to @x without a cast.
*
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#define __get_user(x, ptr) \
({ \
unsigned long __gu_val; \
/*unsigned long __gu_ptr = (unsigned long)(ptr);*/ \
long __gu_err; \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm("lbu", (ptr), __gu_val, __gu_err); \
break; \
case 2: \
__get_user_asm("lhu", (ptr), __gu_val, __gu_err); \
break; \
case 4: \
__get_user_asm("lw", (ptr), __gu_val, __gu_err); \
break; \
default: \
/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
} \
x = (__typeof__(*(ptr))) __gu_val; \
__gu_err; \
})
#define get_user(x, ptr) \
({ \
access_ok(VERIFY_READ, (ptr), sizeof(*(ptr))) \
? __get_user((x), (ptr)) : -EFAULT; \
})
/* Undefined function to trigger linker error */
extern int bad_user_access_length(void);
/* FIXME is not there defined __pu_val */
#define __put_user(var, ptr) \
@ -197,7 +241,6 @@ extern int bad_user_access_length(void);
#define __put_user_bad() (bad_user_access_length(), (-EFAULT))
#define put_user(x, ptr) __put_user((x), (ptr))
#define get_user(x, ptr) __get_user((x), (ptr))
#define copy_to_user(to, from, n) (memcpy((to), (from), (n)), 0)
#define copy_from_user(to, from, n) (memcpy((to), (from), (n)), 0)