m68knommu: remove is_in_rom() function
[linux-2.6.git] / include / asm-m68knommu / uaccess.h
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
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  */
24 static inline int _access_ok(unsigned long addr, unsigned long size)
25 {
26         return 1;
27 }
28
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;                                           \
99     typeof(x) __gu_val = 0;                                     \
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:                                                     \
111         memcpy((void *) &__gu_val, ptr, sizeof (*(ptr)));       \
112         break;                                                  \
113     default:                                                    \
114         __gu_val = 0;                                           \
115         __gu_err = __get_user_bad();                            \
116         break;                                                  \
117     }                                                           \
118     (x) = (typeof(*(ptr))) __gu_val;                            \
119     __gu_err;                                                   \
120 })
121 #define __get_user(x, ptr) get_user(x, ptr)
122
123 extern int __get_user_bad(void);
124
125 #define __get_user_asm(err,x,ptr,bwl,reg)                       \
126         __asm__ ("move" #bwl " %1,%0"                           \
127                  : "=d" (x)                                     \
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 */