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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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