MIPS: uaccess: Reduce number of nested macros

Clean up macros even further after removal get_fs/set_fs.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Thomas Bogendoerfer 2021-04-08 20:14:37 +02:00
parent e86e755966
commit ddb002d6d6
1 changed files with 68 additions and 86 deletions

View File

@ -102,8 +102,13 @@ static inline int __access_ok(const void __user *p, unsigned long size)
*
* Returns zero on success, or -EFAULT on error.
*/
#define put_user(x,ptr) \
__put_user_check((x), (ptr), sizeof(*(ptr)))
#define put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __user *__p = (ptr); \
\
might_fault(); \
access_ok(__p, sizeof(*__p)) ? __put_user((x), __p) : -EFAULT; \
})
/*
* get_user: - Get a simple variable from user space.
@ -123,8 +128,14 @@ static inline int __access_ok(const void __user *p, unsigned long size)
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#define get_user(x,ptr) \
__get_user_check((x), (ptr), sizeof(*(ptr)))
#define get_user(x, ptr) \
({ \
const __typeof__(*(ptr)) __user *__p = (ptr); \
\
might_fault(); \
access_ok(__p, sizeof(*__p)) ? __get_user((x), __p) : \
((x) = 0, -EFAULT); \
})
/*
* __put_user: - Write a simple value into user space, with less checking.
@ -146,8 +157,32 @@ static inline int __access_ok(const void __user *p, unsigned long size)
*
* Returns zero on success, or -EFAULT on error.
*/
#define __put_user(x,ptr) \
__put_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __put_user(x, ptr) \
({ \
__typeof__(*(ptr)) __user *__pu_ptr = (ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
int __pu_err = 0; \
\
__chk_user_ptr(__pu_ptr); \
switch (sizeof(*__pu_ptr)) { \
case 1: \
__put_data_asm(user_sb, __pu_ptr); \
break; \
case 2: \
__put_data_asm(user_sh, __pu_ptr); \
break; \
case 4: \
__put_data_asm(user_sw, __pu_ptr); \
break; \
case 8: \
__PUT_DW(user_sd, __pu_ptr); \
break; \
default: \
BUILD_BUG(); \
} \
\
__pu_err; \
})
/*
* __get_user: - Get a simple variable from user space, with less checking.
@ -170,8 +205,31 @@ static inline int __access_ok(const void __user *p, unsigned long size)
* Returns zero on success, or -EFAULT on error.
* On error, the variable @x is set to zero.
*/
#define __get_user(x,ptr) \
__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) \
({ \
const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \
int __gu_err = 0; \
\
__chk_user_ptr(__gu_ptr); \
switch (sizeof(*__gu_ptr)) { \
case 1: \
__get_data_asm((x), user_lb, __gu_ptr); \
break; \
case 2: \
__get_data_asm((x), user_lh, __gu_ptr); \
break; \
case 4: \
__get_data_asm((x), user_lw, __gu_ptr); \
break; \
case 8: \
__GET_DW((x), user_ld, __gu_ptr); \
break; \
default: \
BUILD_BUG(); \
} \
\
__gu_err; \
})
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
@ -183,43 +241,6 @@ struct __large_struct { unsigned long buf[100]; };
#define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
#endif
extern void __get_user_unknown(void);
#define __get_user_common(val, size, ptr) \
do { \
switch (size) { \
case 1: __get_data_asm(val, user_lb, ptr); break; \
case 2: __get_data_asm(val, user_lh, ptr); break; \
case 4: __get_data_asm(val, user_lw, ptr); break; \
case 8: __GET_DW(val, user_ld, ptr); break; \
default: __get_user_unknown(); break; \
} \
} while (0)
#define __get_user_nocheck(x, ptr, size) \
({ \
int __gu_err; \
\
__chk_user_ptr(ptr); \
__get_user_common((x), size, ptr); \
\
__gu_err; \
})
#define __get_user_check(x, ptr, size) \
({ \
int __gu_err = -EFAULT; \
const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
\
might_fault(); \
if (likely(access_ok(__gu_ptr, size))) { \
__get_user_common((x), size, __gu_ptr); \
} else \
(x) = 0; \
\
__gu_err; \
})
#define __get_data_asm(val, insn, addr) \
{ \
long __gu_tmp; \
@ -297,7 +318,7 @@ do { \
(__force type *)(src)); \
break; \
default: \
__get_user_unknown(); \
BUILD_BUG(); \
break; \
} \
if (unlikely(__gu_err)) \
@ -315,43 +336,6 @@ do { \
#define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
#endif
#define __put_user_common(ptr, size) \
do { \
switch (size) { \
case 1: __put_data_asm(user_sb, ptr); break; \
case 2: __put_data_asm(user_sh, ptr); break; \
case 4: __put_data_asm(user_sw, ptr); break; \
case 8: __PUT_DW(user_sd, ptr); break; \
default: __put_user_unknown(); break; \
} \
} while (0)
#define __put_user_nocheck(x, ptr, size) \
({ \
__typeof__(*(ptr)) __pu_val; \
int __pu_err = 0; \
\
__pu_val = (x); \
__chk_user_ptr(ptr); \
__put_user_common(ptr, size); \
\
__pu_err; \
})
#define __put_user_check(x, ptr, size) \
({ \
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
__typeof__(*(ptr)) __pu_val = (x); \
int __pu_err = -EFAULT; \
\
might_fault(); \
if (likely(access_ok(__pu_addr, size))) { \
__put_user_common(__pu_addr, size); \
} \
\
__pu_err; \
})
#define __put_data_asm(insn, ptr) \
{ \
__asm__ __volatile__( \
@ -390,8 +374,6 @@ do { \
"i" (-EFAULT)); \
}
extern void __put_user_unknown(void);
#define __put_kernel_nofault(dst, src, type, err_label) \
do { \
type __pu_val; \
@ -412,7 +394,7 @@ do { \
__PUT_DW(kernel_sd, (type *)(dst)); \
break; \
default: \
__put_user_unknown(); \
BUILD_BUG(); \
break; \
} \
if (unlikely(__pu_err)) \