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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __M68KNOMMU_UACCESS_H |
3 | #define __M68KNOMMU_UACCESS_H | |
4 | ||
5 | /* | |
6 | * User space memory access functions | |
7 | */ | |
1da177e4 LT |
8 | #include <linux/mm.h> |
9 | #include <linux/string.h> | |
10 | ||
11 | #include <asm/segment.h> | |
12 | ||
96d4f267 | 13 | #define access_ok(addr,size) _access_ok((unsigned long)(addr),(size)) |
1da177e4 | 14 | |
10146801 GU |
15 | /* |
16 | * It is not enough to just have access_ok check for a real RAM address. | |
17 | * This would disallow the case of code/ro-data running XIP in flash/rom. | |
18 | * Ideally we would check the possible flash ranges too, but that is | |
19 | * currently not so easy. | |
20 | */ | |
1da177e4 LT |
21 | static inline int _access_ok(unsigned long addr, unsigned long size) |
22 | { | |
10146801 | 23 | return 1; |
1da177e4 LT |
24 | } |
25 | ||
1da177e4 LT |
26 | /* |
27 | * These are the main single-value transfer routines. They automatically | |
28 | * use the right size if we just have the right pointer type. | |
29 | */ | |
30 | ||
31 | #define put_user(x, ptr) \ | |
32 | ({ \ | |
33 | int __pu_err = 0; \ | |
34 | typeof(*(ptr)) __pu_val = (x); \ | |
35 | switch (sizeof (*(ptr))) { \ | |
36 | case 1: \ | |
37 | __put_user_asm(__pu_err, __pu_val, ptr, b); \ | |
38 | break; \ | |
39 | case 2: \ | |
40 | __put_user_asm(__pu_err, __pu_val, ptr, w); \ | |
41 | break; \ | |
42 | case 4: \ | |
43 | __put_user_asm(__pu_err, __pu_val, ptr, l); \ | |
44 | break; \ | |
45 | case 8: \ | |
46 | memcpy(ptr, &__pu_val, sizeof (*(ptr))); \ | |
47 | break; \ | |
48 | default: \ | |
49 | __pu_err = __put_user_bad(); \ | |
50 | break; \ | |
51 | } \ | |
52 | __pu_err; \ | |
53 | }) | |
54 | #define __put_user(x, ptr) put_user(x, ptr) | |
55 | ||
56 | extern int __put_user_bad(void); | |
57 | ||
58 | /* | |
59 | * Tell gcc we read from memory instead of writing: this is because | |
60 | * we do not write to any memory gcc knows about, so there are no | |
61 | * aliasing issues. | |
62 | */ | |
63 | ||
64 | #define __ptr(x) ((unsigned long *)(x)) | |
65 | ||
66 | #define __put_user_asm(err,x,ptr,bwl) \ | |
67 | __asm__ ("move" #bwl " %0,%1" \ | |
68 | : /* no outputs */ \ | |
69 | :"d" (x),"m" (*__ptr(ptr)) : "memory") | |
70 | ||
71 | #define get_user(x, ptr) \ | |
72 | ({ \ | |
73 | int __gu_err = 0; \ | |
1b0f06d0 | 74 | typeof(x) __gu_val = 0; \ |
1da177e4 LT |
75 | switch (sizeof(*(ptr))) { \ |
76 | case 1: \ | |
77 | __get_user_asm(__gu_err, __gu_val, ptr, b, "=d"); \ | |
78 | break; \ | |
79 | case 2: \ | |
80 | __get_user_asm(__gu_err, __gu_val, ptr, w, "=r"); \ | |
81 | break; \ | |
82 | case 4: \ | |
83 | __get_user_asm(__gu_err, __gu_val, ptr, l, "=r"); \ | |
84 | break; \ | |
85 | case 8: \ | |
1b0f06d0 | 86 | memcpy((void *) &__gu_val, ptr, sizeof (*(ptr))); \ |
1da177e4 LT |
87 | break; \ |
88 | default: \ | |
89 | __gu_val = 0; \ | |
90 | __gu_err = __get_user_bad(); \ | |
91 | break; \ | |
92 | } \ | |
1b0f06d0 | 93 | (x) = (typeof(*(ptr))) __gu_val; \ |
1da177e4 LT |
94 | __gu_err; \ |
95 | }) | |
96 | #define __get_user(x, ptr) get_user(x, ptr) | |
97 | ||
98 | extern int __get_user_bad(void); | |
99 | ||
1b0f06d0 GU |
100 | #define __get_user_asm(err,x,ptr,bwl,reg) \ |
101 | __asm__ ("move" #bwl " %1,%0" \ | |
102 | : "=d" (x) \ | |
1da177e4 LT |
103 | : "m" (*__ptr(ptr))) |
104 | ||
29be02eb AV |
105 | static inline unsigned long |
106 | raw_copy_from_user(void *to, const void __user *from, unsigned long n) | |
107 | { | |
108 | memcpy(to, (__force const void *)from, n); | |
109 | return 0; | |
110 | } | |
1da177e4 | 111 | |
29be02eb AV |
112 | static inline unsigned long |
113 | raw_copy_to_user(void __user *to, const void *from, unsigned long n) | |
114 | { | |
115 | memcpy((__force void *)to, from, n); | |
116 | return 0; | |
117 | } | |
118 | #define INLINE_COPY_FROM_USER | |
119 | #define INLINE_COPY_TO_USER | |
1da177e4 | 120 | |
1da177e4 LT |
121 | /* |
122 | * Copy a null terminated string from userspace. | |
123 | */ | |
124 | ||
125 | static inline long | |
126 | strncpy_from_user(char *dst, const char *src, long count) | |
127 | { | |
128 | char *tmp; | |
129 | strncpy(dst, src, count); | |
130 | for (tmp = dst; *tmp && count > 0; tmp++, count--) | |
131 | ; | |
132 | return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */ | |
133 | } | |
134 | ||
135 | /* | |
136 | * Return the size of a string (including the ending 0) | |
137 | * | |
138 | * Return 0 on exception, a value greater than N if too long | |
139 | */ | |
140 | static inline long strnlen_user(const char *src, long n) | |
141 | { | |
142 | return(strlen(src) + 1); /* DAVIDM make safer */ | |
143 | } | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * Zero Userspace | |
147 | */ | |
148 | ||
149 | static inline unsigned long | |
fa2eae93 | 150 | __clear_user(void *to, unsigned long n) |
1da177e4 LT |
151 | { |
152 | memset(to, 0, n); | |
153 | return 0; | |
154 | } | |
155 | ||
fa2eae93 MW |
156 | #define clear_user(to,n) __clear_user(to,n) |
157 | ||
1da177e4 | 158 | #endif /* _M68KNOMMU_UACCESS_H */ |