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nds32: Extract the checking and getting pointer to a macro

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Signed-off-by: Zong Li <zong@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Zong Li 2018-08-13 16:02:53 +08:00 committed by Greentime Hu
parent 7ef39548df
commit 487913ab18
1 changed files with 41 additions and 39 deletions
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80
arch/nds32/include/asm/uaccess.h
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@ -75,54 +75,54 @@ static inline void set_fs(mm_segment_t fs)
* versions are void (ie, don't return a value as such).
*/
#define get_user(x, ptr) \
({ \
long __e = -EFAULT; \
const __typeof__(*(ptr)) __user *__p = (ptr); \
if (likely(access_ok(VERIFY_READ, __p, sizeof(*__p)))) { \
__e = __get_user(x, __p); \
} else { \
(x) = 0; \
} \
__e; \
})
#define get_user __get_user \
#define __get_user(x, ptr) \
({ \
long __gu_err = 0; \
__get_user_err((x), (ptr), __gu_err); \
__get_user_check((x), (ptr), __gu_err); \
__gu_err; \
})
#define __get_user_error(x, ptr, err) \
({ \
__get_user_err((x), (ptr), err); \
__get_user_check((x), (ptr), (err)); \
(void)0; \
})
#define __get_user_check(x, ptr, err) \
({ \
const __typeof__(*(ptr)) __user *__p = (ptr); \
might_fault(); \
if (access_ok(VERIFY_READ, __p, sizeof(*__p))) { \
__get_user_err((x), __p, (err)); \
} else { \
(x) = 0; (err) = -EFAULT; \
} \
})
#define __get_user_err(x, ptr, err) \
do { \
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
unsigned long __gu_val; \
__chk_user_ptr(__gu_addr); \
switch (sizeof(*(__gu_addr))) { \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__get_user_asm("lbi", __gu_val, __gu_addr, (err)); \
__get_user_asm("lbi", __gu_val, (ptr), (err)); \
break; \
case 2: \
__get_user_asm("lhi", __gu_val, __gu_addr, (err)); \
__get_user_asm("lhi", __gu_val, (ptr), (err)); \
break; \
case 4: \
__get_user_asm("lwi", __gu_val, __gu_addr, (err)); \
__get_user_asm("lwi", __gu_val, (ptr), (err)); \
break; \
case 8: \
__get_user_asm_dword(__gu_val, __gu_addr, (err)); \
__get_user_asm_dword(__gu_val, (ptr), (err)); \
break; \
default: \
BUILD_BUG(); \
break; \
} \
(x) = (__typeof__(*(__gu_addr)))__gu_val; \
(x) = (__force __typeof__(*(ptr)))__gu_val; \
} while (0)
#define __get_user_asm(inst, x, addr, err) \
@ -170,15 +170,7 @@ do { \
: "r"(addr), "i"(-EFAULT) \
: "cc")
#define put_user(x, ptr) \
({ \
long __e = -EFAULT; \
__typeof__(*(ptr)) __user *__p = (ptr); \
if (likely(access_ok(VERIFY_WRITE, __p, sizeof(*__p)))) { \
__e = __put_user(x, __p); \
} \
__e; \
})
#define put_user __put_user \
#define __put_user(x, ptr) \
({ \
@ -189,27 +181,37 @@ do { \
#define __put_user_error(x, ptr, err) \
({ \
__put_user_err((x), (ptr), err); \
__put_user_err((x), (ptr), (err)); \
(void)0; \
})
#define __put_user_check(x, ptr, err) \
({ \
__typeof__(*(ptr)) __user *__p = (ptr); \
might_fault(); \
if (access_ok(VERIFY_WRITE, __p, sizeof(*__p))) { \
__put_user_err((x), __p, (err)); \
} else { \
(err) = -EFAULT; \
} \
})
#define __put_user_err(x, ptr, err) \
do { \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
__typeof__(*(__pu_addr)) __pu_val = (x); \
__chk_user_ptr(__pu_addr); \
switch (sizeof(*(__pu_addr))) { \
__typeof__(*(ptr)) __pu_val = (x); \
__chk_user_ptr(ptr); \
switch (sizeof(*(ptr))) { \
case 1: \
__put_user_asm("sbi", __pu_val, __pu_addr, (err)); \
__put_user_asm("sbi", __pu_val, (ptr), (err)); \
break; \
case 2: \
__put_user_asm("shi", __pu_val, __pu_addr, (err)); \
__put_user_asm("shi", __pu_val, (ptr), (err)); \
break; \
case 4: \
__put_user_asm("swi", __pu_val, __pu_addr, (err)); \
__put_user_asm("swi", __pu_val, (ptr), (err)); \
break; \
case 8: \
__put_user_asm_dword(__pu_val, __pu_addr, (err)); \
__put_user_asm_dword(__pu_val, (ptr), (err)); \
break; \
default: \
BUILD_BUG(); \