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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1e6760c5 MD |
2 | #ifndef __ASM_SH_UACCESS_H |
3 | #define __ASM_SH_UACCESS_H | |
4 | ||
42fd3b14 | 5 | #include <asm/segment.h> |
bcd541d9 | 6 | #include <asm/extable.h> |
42fd3b14 | 7 | |
42fd3b14 PM |
8 | #define __addr_ok(addr) \ |
9 | ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg) | |
10 | ||
11 | /* | |
12 | * __access_ok: Check if address with size is OK or not. | |
13 | * | |
14 | * Uhhuh, this needs 33-bit arithmetic. We have a carry.. | |
15 | * | |
16 | * sum := addr + size; carry? --> flag = true; | |
17 | * if (sum >= addr_limit) flag = true; | |
18 | */ | |
94bd8a05 LT |
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); }) | |
23 | ||
96d4f267 | 24 | #define access_ok(addr, size) \ |
42fd3b14 PM |
25 | (__chk_user_ptr(addr), \ |
26 | __access_ok((unsigned long __force)(addr), (size))) | |
27 | ||
0e100e11 PM |
28 | #define user_addr_max() (current_thread_info()->addr_limit.seg) |
29 | ||
42fd3b14 PM |
30 | /* |
31 | * Uh, these should become the main single-value transfer routines ... | |
32 | * They automatically use the right size if we just have the right | |
33 | * pointer type ... | |
34 | * | |
35 | * As SuperH uses the same address space for kernel and user data, we | |
36 | * can just do these as direct assignments. | |
37 | * | |
38 | * Careful to not | |
39 | * (a) re-use the arguments for side effects (sizeof is ok) | |
40 | * (b) require any knowledge of processes at this stage | |
41 | */ | |
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))) | |
44 | ||
45 | /* | |
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()") | |
49 | */ | |
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))) | |
52 | ||
53 | struct __large_struct { unsigned long buf[100]; }; | |
54 | #define __m(x) (*(struct __large_struct __user *)(x)) | |
55 | ||
56 | #define __get_user_nocheck(x,ptr,size) \ | |
57 | ({ \ | |
58 | long __gu_err; \ | |
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); \ | |
cad1c0df | 63 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
42fd3b14 PM |
64 | __gu_err; \ |
65 | }) | |
66 | ||
67 | #define __get_user_check(x,ptr,size) \ | |
68 | ({ \ | |
69 | long __gu_err = -EFAULT; \ | |
70 | unsigned long __gu_val = 0; \ | |
71 | const __typeof__(*(ptr)) *__gu_addr = (ptr); \ | |
96d4f267 | 72 | if (likely(access_ok(__gu_addr, (size)))) \ |
42fd3b14 | 73 | __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \ |
cad1c0df | 74 | (x) = (__force __typeof__(*(ptr)))__gu_val; \ |
42fd3b14 PM |
75 | __gu_err; \ |
76 | }) | |
77 | ||
78 | #define __put_user_nocheck(x,ptr,size) \ | |
79 | ({ \ | |
80 | long __pu_err; \ | |
81 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
6de9c648 | 82 | __typeof__(*(ptr)) __pu_val = x; \ |
42fd3b14 | 83 | __chk_user_ptr(ptr); \ |
6de9c648 | 84 | __put_user_size(__pu_val, __pu_addr, (size), __pu_err); \ |
42fd3b14 PM |
85 | __pu_err; \ |
86 | }) | |
87 | ||
88 | #define __put_user_check(x,ptr,size) \ | |
89 | ({ \ | |
90 | long __pu_err = -EFAULT; \ | |
91 | __typeof__(*(ptr)) __user *__pu_addr = (ptr); \ | |
6de9c648 | 92 | __typeof__(*(ptr)) __pu_val = x; \ |
96d4f267 | 93 | if (likely(access_ok(__pu_addr, size))) \ |
6de9c648 | 94 | __put_user_size(__pu_val, __pu_addr, (size), \ |
42fd3b14 PM |
95 | __pu_err); \ |
96 | __pu_err; \ | |
97 | }) | |
98 | ||
9b01bd9e | 99 | #ifdef CONFIG_SUPERH32 |
a1ce3928 | 100 | # include <asm/uaccess_32.h> |
1da177e4 | 101 | #else |
a1ce3928 | 102 | # include <asm/uaccess_64.h> |
1da177e4 | 103 | #endif |
1e6760c5 | 104 | |
0e100e11 PM |
105 | extern long strncpy_from_user(char *dest, const char __user *src, long count); |
106 | ||
cba8df4b PM |
107 | extern __must_check long strnlen_user(const char __user *str, long n); |
108 | ||
42fd3b14 PM |
109 | /* Generic arbitrary sized copy. */ |
110 | /* Return the number of bytes NOT copied */ | |
111 | __kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n); | |
112 | ||
113 | static __always_inline unsigned long | |
f98f48ee | 114 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) |
42fd3b14 PM |
115 | { |
116 | return __copy_user(to, (__force void *)from, n); | |
117 | } | |
118 | ||
119 | static __always_inline unsigned long __must_check | |
f98f48ee | 120 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) |
42fd3b14 PM |
121 | { |
122 | return __copy_user((__force void *)to, from, n); | |
123 | } | |
f98f48ee AV |
124 | #define INLINE_COPY_FROM_USER |
125 | #define INLINE_COPY_TO_USER | |
42fd3b14 PM |
126 | |
127 | /* | |
128 | * Clear the area and return remaining number of bytes | |
129 | * (on failure. Usually it's 0.) | |
130 | */ | |
131 | __kernel_size_t __clear_user(void *addr, __kernel_size_t size); | |
132 | ||
133 | #define clear_user(addr,n) \ | |
134 | ({ \ | |
135 | void __user * __cl_addr = (addr); \ | |
136 | unsigned long __cl_size = (n); \ | |
137 | \ | |
96d4f267 | 138 | if (__cl_size && access_ok(__cl_addr, __cl_size)) \ |
42fd3b14 PM |
139 | __cl_size = __clear_user(__cl_addr, __cl_size); \ |
140 | \ | |
141 | __cl_size; \ | |
142 | }) | |
143 | ||
e839ca52 DH |
144 | extern void *set_exception_table_vec(unsigned int vec, void *handler); |
145 | ||
146 | static inline void *set_exception_table_evt(unsigned int evt, void *handler) | |
147 | { | |
148 | return set_exception_table_vec(evt >> 5, handler); | |
149 | } | |
150 | ||
151 | struct mem_access { | |
152 | unsigned long (*from)(void *dst, const void __user *src, unsigned long cnt); | |
153 | unsigned long (*to)(void __user *dst, const void *src, unsigned long cnt); | |
154 | }; | |
155 | ||
156 | int handle_unaligned_access(insn_size_t instruction, struct pt_regs *regs, | |
157 | struct mem_access *ma, int, unsigned long address); | |
42fd3b14 | 158 | |
1e6760c5 | 159 | #endif /* __ASM_SH_UACCESS_H */ |