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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __H8300_UACCESS_H
2#define __H8300_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/* We let the MMU do all checking */
17#define access_ok(type, addr, size) __access_ok((unsigned long)addr,size)
18static inline int __access_ok(unsigned long addr, unsigned long size)
19{
20#define RANGE_CHECK_OK(addr, size, lower, upper) \
21 (((addr) >= (lower)) && (((addr) + (size)) < (upper)))
22
23 extern unsigned long _ramend;
24 return(RANGE_CHECK_OK(addr, size, 0L, (unsigned long)&_ramend));
25}
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027/*
28 * The exception table consists of pairs of addresses: the first is the
29 * address of an instruction that is allowed to fault, and the second is
30 * the address at which the program should continue. No registers are
31 * modified, so it is entirely up to the continuation code to figure out
32 * what to do.
33 *
34 * All the routines below use bits of fixup code that are out of line
35 * with the main instruction path. This means when everything is well,
36 * we don't even have to jump over them. Further, they do not intrude
37 * on our cache or tlb entries.
38 */
39
40struct exception_table_entry
41{
42 unsigned long insn, fixup;
43};
44
45/* Returns 0 if exception not found and fixup otherwise. */
46extern unsigned long search_exception_table(unsigned long);
47
48
49/*
50 * These are the main single-value transfer routines. They automatically
51 * use the right size if we just have the right pointer type.
52 */
53
54#define put_user(x, ptr) \
55({ \
56 int __pu_err = 0; \
57 typeof(*(ptr)) __pu_val = (x); \
58 switch (sizeof (*(ptr))) { \
59 case 1: \
60 case 2: \
61 case 4: \
62 *(ptr) = (__pu_val); \
63 break; \
64 case 8: \
65 memcpy(ptr, &__pu_val, sizeof (*(ptr))); \
66 break; \
67 default: \
68 __pu_err = __put_user_bad(); \
69 break; \
70 } \
71 __pu_err; \
72})
73#define __put_user(x, ptr) put_user(x, ptr)
74
75extern int __put_user_bad(void);
76
77/*
78 * Tell gcc we read from memory instead of writing: this is because
79 * we do not write to any memory gcc knows about, so there are no
80 * aliasing issues.
81 */
82
83#define __ptr(x) ((unsigned long *)(x))
84
85/*
86 * Tell gcc we read from memory instead of writing: this is because
87 * we do not write to any memory gcc knows about, so there are no
88 * aliasing issues.
89 */
90
91#define get_user(x, ptr) \
92({ \
93 int __gu_err = 0; \
94 typeof(*(ptr)) __gu_val = 0; \
95 switch (sizeof(*(ptr))) { \
96 case 1: \
97 case 2: \
98 case 4: \
99 __gu_val = *(ptr); \
100 break; \
101 case 8: \
102 memcpy(&__gu_val, ptr, sizeof (*(ptr))); \
103 break; \
104 default: \
105 __gu_val = 0; \
106 __gu_err = __get_user_bad(); \
107 break; \
108 } \
109 (x) = __gu_val; \
110 __gu_err; \
111})
112#define __get_user(x, ptr) get_user(x, ptr)
113
114extern int __get_user_bad(void);
115
116#define copy_from_user(to, from, n) (memcpy(to, from, n), 0)
117#define copy_to_user(to, from, n) (memcpy(to, from, n), 0)
118
119#define __copy_from_user(to, from, n) copy_from_user(to, from, n)
120#define __copy_to_user(to, from, n) copy_to_user(to, from, n)
121#define __copy_to_user_inatomic __copy_to_user
122#define __copy_from_user_inatomic __copy_from_user
123
124#define copy_to_user_ret(to,from,n,retval) ({ if (copy_to_user(to,from,n)) return retval; })
125
126#define copy_from_user_ret(to,from,n,retval) ({ if (copy_from_user(to,from,n)) return retval; })
127
128/*
129 * Copy a null terminated string from userspace.
130 */
131
132static inline long
133strncpy_from_user(char *dst, const char *src, long count)
134{
135 char *tmp;
136 strncpy(dst, src, count);
137 for (tmp = dst; *tmp && count > 0; tmp++, count--)
138 ;
139 return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */
140}
141
142/*
143 * Return the size of a string (including the ending 0)
144 *
145 * Return 0 on exception, a value greater than N if too long
146 */
147static inline long strnlen_user(const char *src, long n)
148{
149 return(strlen(src) + 1); /* DAVIDM make safer */
150}
151
152#define strlen_user(str) strnlen_user(str, 32767)
153
154/*
155 * Zero Userspace
156 */
157
158static inline unsigned long
159clear_user(void *to, unsigned long n)
160{
161 memset(to, 0, n);
162 return 0;
163}
164
165#endif /* _H8300_UACCESS_H */