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1da177e4 LT |
1 | #ifndef __M68KNOMMU_UACCESS_H |
2 | #define __M68KNOMMU_UACCESS_H | |
3 | ||
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
7 | #include <linux/sched.h> | |
8 | #include <linux/mm.h> | |
9 | #include <linux/string.h> | |
10 | ||
11 | #include <asm/segment.h> | |
12 | ||
13 | #define VERIFY_READ 0 | |
14 | #define VERIFY_WRITE 1 | |
15 | ||
16 | #define access_ok(type,addr,size) _access_ok((unsigned long)(addr),(size)) | |
17 | ||
10146801 GU |
18 | /* |
19 | * It is not enough to just have access_ok check for a real RAM address. | |
20 | * This would disallow the case of code/ro-data running XIP in flash/rom. | |
21 | * Ideally we would check the possible flash ranges too, but that is | |
22 | * currently not so easy. | |
23 | */ | |
1da177e4 LT |
24 | static inline int _access_ok(unsigned long addr, unsigned long size) |
25 | { | |
10146801 | 26 | return 1; |
1da177e4 LT |
27 | } |
28 | ||
1da177e4 LT |
29 | /* |
30 | * The exception table consists of pairs of addresses: the first is the | |
31 | * address of an instruction that is allowed to fault, and the second is | |
32 | * the address at which the program should continue. No registers are | |
33 | * modified, so it is entirely up to the continuation code to figure out | |
34 | * what to do. | |
35 | * | |
36 | * All the routines below use bits of fixup code that are out of line | |
37 | * with the main instruction path. This means when everything is well, | |
38 | * we don't even have to jump over them. Further, they do not intrude | |
39 | * on our cache or tlb entries. | |
40 | */ | |
41 | ||
42 | struct exception_table_entry | |
43 | { | |
44 | unsigned long insn, fixup; | |
45 | }; | |
46 | ||
47 | /* Returns 0 if exception not found and fixup otherwise. */ | |
48 | extern unsigned long search_exception_table(unsigned long); | |
49 | ||
50 | ||
51 | /* | |
52 | * These are the main single-value transfer routines. They automatically | |
53 | * use the right size if we just have the right pointer type. | |
54 | */ | |
55 | ||
56 | #define put_user(x, ptr) \ | |
57 | ({ \ | |
58 | int __pu_err = 0; \ | |
59 | typeof(*(ptr)) __pu_val = (x); \ | |
60 | switch (sizeof (*(ptr))) { \ | |
61 | case 1: \ | |
62 | __put_user_asm(__pu_err, __pu_val, ptr, b); \ | |
63 | break; \ | |
64 | case 2: \ | |
65 | __put_user_asm(__pu_err, __pu_val, ptr, w); \ | |
66 | break; \ | |
67 | case 4: \ | |
68 | __put_user_asm(__pu_err, __pu_val, ptr, l); \ | |
69 | break; \ | |
70 | case 8: \ | |
71 | memcpy(ptr, &__pu_val, sizeof (*(ptr))); \ | |
72 | break; \ | |
73 | default: \ | |
74 | __pu_err = __put_user_bad(); \ | |
75 | break; \ | |
76 | } \ | |
77 | __pu_err; \ | |
78 | }) | |
79 | #define __put_user(x, ptr) put_user(x, ptr) | |
80 | ||
81 | extern int __put_user_bad(void); | |
82 | ||
83 | /* | |
84 | * Tell gcc we read from memory instead of writing: this is because | |
85 | * we do not write to any memory gcc knows about, so there are no | |
86 | * aliasing issues. | |
87 | */ | |
88 | ||
89 | #define __ptr(x) ((unsigned long *)(x)) | |
90 | ||
91 | #define __put_user_asm(err,x,ptr,bwl) \ | |
92 | __asm__ ("move" #bwl " %0,%1" \ | |
93 | : /* no outputs */ \ | |
94 | :"d" (x),"m" (*__ptr(ptr)) : "memory") | |
95 | ||
96 | #define get_user(x, ptr) \ | |
97 | ({ \ | |
98 | int __gu_err = 0; \ | |
1b0f06d0 | 99 | typeof(x) __gu_val = 0; \ |
1da177e4 LT |
100 | switch (sizeof(*(ptr))) { \ |
101 | case 1: \ | |
102 | __get_user_asm(__gu_err, __gu_val, ptr, b, "=d"); \ | |
103 | break; \ | |
104 | case 2: \ | |
105 | __get_user_asm(__gu_err, __gu_val, ptr, w, "=r"); \ | |
106 | break; \ | |
107 | case 4: \ | |
108 | __get_user_asm(__gu_err, __gu_val, ptr, l, "=r"); \ | |
109 | break; \ | |
110 | case 8: \ | |
1b0f06d0 | 111 | memcpy((void *) &__gu_val, ptr, sizeof (*(ptr))); \ |
1da177e4 LT |
112 | break; \ |
113 | default: \ | |
114 | __gu_val = 0; \ | |
115 | __gu_err = __get_user_bad(); \ | |
116 | break; \ | |
117 | } \ | |
1b0f06d0 | 118 | (x) = (typeof(*(ptr))) __gu_val; \ |
1da177e4 LT |
119 | __gu_err; \ |
120 | }) | |
121 | #define __get_user(x, ptr) get_user(x, ptr) | |
122 | ||
123 | extern int __get_user_bad(void); | |
124 | ||
1b0f06d0 GU |
125 | #define __get_user_asm(err,x,ptr,bwl,reg) \ |
126 | __asm__ ("move" #bwl " %1,%0" \ | |
127 | : "=d" (x) \ | |
1da177e4 LT |
128 | : "m" (*__ptr(ptr))) |
129 | ||
130 | #define copy_from_user(to, from, n) (memcpy(to, from, n), 0) | |
131 | #define copy_to_user(to, from, n) (memcpy(to, from, n), 0) | |
132 | ||
133 | #define __copy_from_user(to, from, n) copy_from_user(to, from, n) | |
134 | #define __copy_to_user(to, from, n) copy_to_user(to, from, n) | |
135 | #define __copy_to_user_inatomic __copy_to_user | |
136 | #define __copy_from_user_inatomic __copy_from_user | |
137 | ||
138 | #define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; }) | |
139 | ||
140 | #define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; }) | |
141 | ||
142 | /* | |
143 | * Copy a null terminated string from userspace. | |
144 | */ | |
145 | ||
146 | static inline long | |
147 | strncpy_from_user(char *dst, const char *src, long count) | |
148 | { | |
149 | char *tmp; | |
150 | strncpy(dst, src, count); | |
151 | for (tmp = dst; *tmp && count > 0; tmp++, count--) | |
152 | ; | |
153 | return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */ | |
154 | } | |
155 | ||
156 | /* | |
157 | * Return the size of a string (including the ending 0) | |
158 | * | |
159 | * Return 0 on exception, a value greater than N if too long | |
160 | */ | |
161 | static inline long strnlen_user(const char *src, long n) | |
162 | { | |
163 | return(strlen(src) + 1); /* DAVIDM make safer */ | |
164 | } | |
165 | ||
166 | #define strlen_user(str) strnlen_user(str, 32767) | |
167 | ||
168 | /* | |
169 | * Zero Userspace | |
170 | */ | |
171 | ||
172 | static inline unsigned long | |
173 | clear_user(void *to, unsigned long n) | |
174 | { | |
175 | memset(to, 0, n); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | #endif /* _M68KNOMMU_UACCESS_H */ |