1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_UACCESS_H
3 #define __ASM_SH_UACCESS_H
4
5 #include <asm/extable.h>
6 #include <asm-generic/access_ok.h>
7
8 /*
9 * Uh, these should become the main single-value transfer routines ...
10 * They automatically use the right size if we just have the right
11 * pointer type ...
12 *
13 * As SuperH uses the same address space for kernel and user data, we
14 * can just do these as direct assignments.
15 *
16 * Careful to not
17 * (a) re-use the arguments for side effects (sizeof is ok)
18 * (b) require any knowledge of processes at this stage
19 */
20 #define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
21 #define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
22
23 /*
24 * The "__xxx" versions do not do address space checking, useful when
25 * doing multiple accesses to the same area (the user has to do the
26 * checks by hand with "access_ok()")
27 */
28 #define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
29 #define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
30
31 struct __large_struct { unsigned long buf[100]; };
32 #define __m(x) (*(struct __large_struct __user *)(x))
33
34 #define __get_user_nocheck(x,ptr,size) \
35 ({ \
36 long __gu_err; \
37 unsigned long __gu_val; \
38 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
39 __chk_user_ptr(ptr); \
40 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
41 (x) = (__force __typeof__(*(ptr)))__gu_val; \
42 __gu_err; \
43 })
44
45 #define __get_user_check(x,ptr,size) \
46 ({ \
47 long __gu_err = -EFAULT; \
48 unsigned long __gu_val = 0; \
49 const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
50 if (likely(access_ok(__gu_addr, (size)))) \
51 __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
52 (x) = (__force __typeof__(*(ptr)))__gu_val; \
53 __gu_err; \
54 })
55
56 #define __put_user_nocheck(x,ptr,size) \
57 ({ \
58 long __pu_err; \
59 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
60 __typeof__(*(ptr)) __pu_val = x; \
61 __chk_user_ptr(ptr); \
62 __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \
63 __pu_err; \
64 })
65
66 #define __put_user_check(x,ptr,size) \
67 ({ \
68 long __pu_err = -EFAULT; \
69 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
70 __typeof__(*(ptr)) __pu_val = x; \
71 if (likely(access_ok(__pu_addr, size))) \
72 __put_user_size(__pu_val, __pu_addr, (size), \
73 __pu_err); \
74 __pu_err; \
75 })
76
77 # include <asm/uaccess_32.h>
78
79 extern long strncpy_from_user(char *dest, const char __user *src, long count);
80
81 extern __must_check long strnlen_user(const char __user *str, long n);
82
83 /* Generic arbitrary sized copy. */
84 /* Return the number of bytes NOT copied */
85 __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
86
87 static __always_inline unsigned long
88 raw_copy_from_user(void *to, const void __user *from, unsigned long n)
89 {
90 return __copy_user(to, (__force void *)from, n);
91 }
92
93 static __always_inline unsigned long __must_check
94 raw_copy_to_user(void __user *to, const void *from, unsigned long n)
95 {
96 return __copy_user((__force void *)to, from, n);
97 }
98 #define INLINE_COPY_FROM_USER
99 #define INLINE_COPY_TO_USER
100
101 /*
102 * Clear the area and return remaining number of bytes
103 * (on failure. Usually it's 0.)
104 */
105 __kernel_size_t __clear_user(void __user *addr, __kernel_size_t size);
106
107 #define clear_user(addr,n) \
108 ({ \
109 void __user * __cl_addr = (addr); \
110 unsigned long __cl_size = (n); \
111 \
112 if (__cl_size && access_ok(__cl_addr, __cl_size)) \
113 __cl_size = __clear_user(__cl_addr, __cl_size); \
114 \
115 __cl_size; \
116 })
117
118 extern void *set_exception_table_vec(unsigned int vec, void *handler);
119
120 static inline void *set_exception_table_evt(unsigned int evt, void *handler)
121 {
122 return set_exception_table_vec(evt >> 5, handler);
123 }
124
125 struct mem_access {
126 unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt);
127 unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt);
128 };
129
130 int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs,
131 struct mem_access *ma, int, unsigned long address);
132
133 #endif /* __ASM_SH_UACCESS_H */
134
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