1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_UACCESS_H
3 #define __ASM_SH_UACCESS_H
5 #include <asm/segment.h>
6 #include <asm/extable.h>
8 #define __addr_ok(addr) \
9 ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
12 * __access_ok: Check if address with size is OK or not.
14 * Uhhuh, this needs 33-bit arithmetic. We have a carry..
16 * sum := addr + size; carry? --> flag = true;
17 * if (sum >= addr_limit) flag = true;
19 #define __access_ok(addr, size) ({ \
20 unsigned long __ao_a = (addr), __ao_b = (size); \
21 unsigned long __ao_end = __ao_a + __ao_b - !!__ao_b; \
22 __ao_end >= __ao_a && __addr_ok(__ao_end); })
24 #define access_ok(addr, size) \
25 (__chk_user_ptr(addr), \
26 __access_ok((unsigned long __force)(addr), (size)))
28 #define user_addr_max() (current_thread_info()->addr_limit.seg)
31 * Uh, these should become the main single-value transfer routines ...
32 * They automatically use the right size if we just have the right
35 * As SuperH uses the same address space for kernel and user data, we
36 * can just do these as direct assignments.
39 * (a) re-use the arguments for side effects (sizeof is ok)
40 * (b) require any knowledge of processes at this stage
42 #define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
43 #define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
46 * The "__xxx" versions do not do address space checking, useful when
47 * doing multiple accesses to the same area (the user has to do the
48 * checks by hand with "access_ok()")
50 #define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
51 #define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
53 struct __large_struct
{ unsigned long buf
[100]; };
54 #define __m(x) (*(struct __large_struct __user *)(x))
56 #define __get_user_nocheck(x,ptr,size) \
59 unsigned long __gu_val; \
60 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
61 __chk_user_ptr(ptr); \
62 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
63 (x) = (__force __typeof__(*(ptr)))__gu_val; \
67 #define __get_user_check(x,ptr,size) \
69 long __gu_err = -EFAULT; \
70 unsigned long __gu_val = 0; \
71 const __typeof__(*(ptr)) *__gu_addr = (ptr); \
72 if (likely(access_ok(__gu_addr, (size)))) \
73 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
74 (x) = (__force __typeof__(*(ptr)))__gu_val; \
78 #define __put_user_nocheck(x,ptr,size) \
81 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
82 __typeof__(*(ptr)) __pu_val = x; \
83 __chk_user_ptr(ptr); \
84 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
88 #define __put_user_check(x,ptr,size) \
90 long __pu_err = -EFAULT; \
91 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
92 __typeof__(*(ptr)) __pu_val = x; \
93 if (likely(access_ok(__pu_addr, size))) \
94 __put_user_size(__pu_val, __pu_addr, (size), \
99 # include <asm/uaccess_32.h>
101 extern long strncpy_from_user(char *dest
, const char __user
*src
, long count
);
103 extern __must_check
long strnlen_user(const char __user
*str
, long n
);
105 /* Generic arbitrary sized copy. */
106 /* Return the number of bytes NOT copied */
107 __kernel_size_t
__copy_user(void *to
, const void *from
, __kernel_size_t n
);
109 static __always_inline
unsigned long
110 raw_copy_from_user(void *to
, const void __user
*from
, unsigned long n
)
112 return __copy_user(to
, (__force
void *)from
, n
);
115 static __always_inline
unsigned long __must_check
116 raw_copy_to_user(void __user
*to
, const void *from
, unsigned long n
)
118 return __copy_user((__force
void *)to
, from
, n
);
120 #define INLINE_COPY_FROM_USER
121 #define INLINE_COPY_TO_USER
124 * Clear the area and return remaining number of bytes
125 * (on failure. Usually it's 0.)
127 __kernel_size_t
__clear_user(void *addr
, __kernel_size_t size
);
129 #define clear_user(addr,n) \
131 void __user * __cl_addr = (addr); \
132 unsigned long __cl_size = (n); \
134 if (__cl_size && access_ok(__cl_addr, __cl_size)) \
135 __cl_size = __clear_user(__cl_addr, __cl_size); \
140 extern void *set_exception_table_vec(unsigned int vec
, void *handler
);
142 static inline void *set_exception_table_evt(unsigned int evt
, void *handler
)
144 return set_exception_table_vec(evt
>> 5, handler
);
148 unsigned long (*from
)(void *dst
, const void __user
*src
, unsigned long cnt
);
149 unsigned long (*to
)(void __user
*dst
, const void *src
, unsigned long cnt
);
152 int handle_unaligned_access(insn_size_t instruction
, struct pt_regs
*regs
,
153 struct mem_access
*ma
, int, unsigned long address
);
155 #endif /* __ASM_SH_UACCESS_H */