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1da177e4 LT |
1 | #ifndef __V850_UACCESS_H__ |
2 | #define __V850_UACCESS_H__ | |
3 | ||
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
7 | ||
8 | #include <linux/errno.h> | |
9 | #include <linux/string.h> | |
10 | ||
11 | #include <asm/segment.h> | |
12 | #include <asm/machdep.h> | |
13 | ||
14 | #define VERIFY_READ 0 | |
15 | #define VERIFY_WRITE 1 | |
16 | ||
23f88fe4 | 17 | static inline int access_ok (int type, const void *addr, unsigned long size) |
1da177e4 LT |
18 | { |
19 | /* XXX I guess we should check against real ram bounds at least, and | |
20 | possibly make sure ADDR is not within the kernel. | |
21 | For now we just check to make sure it's not a small positive | |
22 | or negative value, as that will at least catch some kinds of | |
23 | error. In particular, we make sure that ADDR's not within the | |
24 | interrupt vector area, which we know starts at zero, or within the | |
25 | peripheral-I/O area, which is located just _before_ zero. */ | |
26 | unsigned long val = (unsigned long)addr; | |
27 | return val >= (0x80 + NUM_CPU_IRQS*16) && val < 0xFFFFF000; | |
28 | } | |
29 | ||
1da177e4 LT |
30 | /* |
31 | * The exception table consists of pairs of addresses: the first is the | |
32 | * address of an instruction that is allowed to fault, and the second is | |
33 | * the address at which the program should continue. No registers are | |
34 | * modified, so it is entirely up to the continuation code to figure out | |
35 | * what to do. | |
36 | * | |
37 | * All the routines below use bits of fixup code that are out of line | |
38 | * with the main instruction path. This means when everything is well, | |
39 | * we don't even have to jump over them. Further, they do not intrude | |
40 | * on our cache or tlb entries. | |
41 | */ | |
42 | ||
43 | struct exception_table_entry | |
44 | { | |
45 | unsigned long insn, fixup; | |
46 | }; | |
47 | ||
48 | /* Returns 0 if exception not found and fixup otherwise. */ | |
49 | extern unsigned long search_exception_table (unsigned long); | |
50 | ||
51 | ||
52 | /* | |
53 | * These are the main single-value transfer routines. They automatically | |
54 | * use the right size if we just have the right pointer type. | |
55 | */ | |
56 | ||
57 | extern int bad_user_access_length (void); | |
58 | ||
59 | #define __get_user(var, ptr) \ | |
60 | ({ \ | |
61 | int __gu_err = 0; \ | |
62 | typeof(*(ptr)) __gu_val = 0; \ | |
63 | switch (sizeof (*(ptr))) { \ | |
64 | case 1: \ | |
65 | case 2: \ | |
66 | case 4: \ | |
67 | __gu_val = *(ptr); \ | |
68 | break; \ | |
69 | case 8: \ | |
70 | memcpy(&__gu_val, ptr, sizeof(__gu_val)); \ | |
71 | break; \ | |
72 | default: \ | |
73 | __gu_val = 0; \ | |
74 | __gu_err = __get_user_bad (); \ | |
75 | break; \ | |
76 | } \ | |
77 | (var) = __gu_val; \ | |
78 | __gu_err; \ | |
79 | }) | |
80 | #define __get_user_bad() (bad_user_access_length (), (-EFAULT)) | |
81 | ||
82 | #define __put_user(var, ptr) \ | |
83 | ({ \ | |
84 | int __pu_err = 0; \ | |
85 | switch (sizeof (*(ptr))) { \ | |
86 | case 1: \ | |
87 | case 2: \ | |
88 | case 4: \ | |
89 | *(ptr) = (var); \ | |
90 | break; \ | |
91 | case 8: { \ | |
92 | typeof(*(ptr)) __pu_val = 0; \ | |
93 | memcpy(ptr, &__pu_val, sizeof(__pu_val)); \ | |
94 | } \ | |
95 | break; \ | |
96 | default: \ | |
97 | __pu_err = __put_user_bad (); \ | |
98 | break; \ | |
99 | } \ | |
100 | __pu_err; \ | |
101 | }) | |
102 | #define __put_user_bad() (bad_user_access_length (), (-EFAULT)) | |
103 | ||
104 | #define put_user(x, ptr) __put_user(x, ptr) | |
105 | #define get_user(x, ptr) __get_user(x, ptr) | |
106 | ||
107 | #define __copy_from_user(to, from, n) (memcpy (to, from, n), 0) | |
108 | #define __copy_to_user(to, from, n) (memcpy(to, from, n), 0) | |
109 | ||
110 | #define __copy_to_user_inatomic __copy_to_user | |
111 | #define __copy_from_user_inatomic __copy_from_user | |
112 | ||
113 | #define copy_from_user(to, from, n) __copy_from_user (to, from, n) | |
114 | #define copy_to_user(to, from, n) __copy_to_user(to, from, n) | |
115 | ||
116 | #define copy_to_user_ret(to,from,n,retval) \ | |
117 | ({ if (copy_to_user (to,from,n)) return retval; }) | |
118 | ||
119 | #define copy_from_user_ret(to,from,n,retval) \ | |
120 | ({ if (copy_from_user (to,from,n)) return retval; }) | |
121 | ||
122 | /* | |
123 | * Copy a null terminated string from userspace. | |
124 | */ | |
125 | ||
126 | static inline long | |
127 | strncpy_from_user (char *dst, const char *src, long count) | |
128 | { | |
129 | char *tmp; | |
130 | strncpy (dst, src, count); | |
131 | for (tmp = dst; *tmp && count > 0; tmp++, count--) | |
132 | ; | |
133 | return tmp - dst; | |
134 | } | |
135 | ||
136 | /* | |
137 | * Return the size of a string (including the ending 0) | |
138 | * | |
139 | * Return 0 on exception, a value greater than N if too long | |
140 | */ | |
141 | static inline long strnlen_user (const char *src, long n) | |
142 | { | |
143 | return strlen (src) + 1; | |
144 | } | |
145 | ||
146 | #define strlen_user(str) strnlen_user (str, 32767) | |
147 | ||
148 | /* | |
149 | * Zero Userspace | |
150 | */ | |
151 | ||
152 | static inline unsigned long | |
153 | clear_user (void *to, unsigned long n) | |
154 | { | |
155 | memset (to, 0, n); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | #endif /* __V850_UACCESS_H__ */ |