ARM: perf: use integers for ARMv7 event indices
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / asm-generic / uaccess.h
blobac68c999b6c2165bbba9bea374505cbc60f5abf9
1 #ifndef __ASM_GENERIC_UACCESS_H
2 #define __ASM_GENERIC_UACCESS_H
4 /*
5 * User space memory access functions, these should work
6 * on a ny machine that has kernel and user data in the same
7 * address space, e.g. all NOMMU machines.
8 */
9 #include <linux/sched.h>
10 #include <linux/mm.h>
11 #include <linux/string.h>
13 #include <asm/segment.h>
15 #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
17 #ifndef KERNEL_DS
18 #define KERNEL_DS MAKE_MM_SEG(~0UL)
19 #endif
21 #ifndef USER_DS
22 #define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
23 #endif
25 #ifndef get_fs
26 #define get_ds() (KERNEL_DS)
27 #define get_fs() (current_thread_info()->addr_limit)
29 static inline void set_fs(mm_segment_t fs)
31 current_thread_info()->addr_limit = fs;
33 #endif
35 #define segment_eq(a, b) ((a).seg == (b).seg)
37 #define VERIFY_READ 0
38 #define VERIFY_WRITE 1
40 #define access_ok(type, addr, size) __access_ok((unsigned long)(addr),(size))
43 * The architecture should really override this if possible, at least
44 * doing a check on the get_fs()
46 #ifndef __access_ok
47 static inline int __access_ok(unsigned long addr, unsigned long size)
49 return 1;
51 #endif
54 * The exception table consists of pairs of addresses: the first is the
55 * address of an instruction that is allowed to fault, and the second is
56 * the address at which the program should continue. No registers are
57 * modified, so it is entirely up to the continuation code to figure out
58 * what to do.
60 * All the routines below use bits of fixup code that are out of line
61 * with the main instruction path. This means when everything is well,
62 * we don't even have to jump over them. Further, they do not intrude
63 * on our cache or tlb entries.
66 struct exception_table_entry
68 unsigned long insn, fixup;
71 /* Returns 0 if exception not found and fixup otherwise. */
72 extern unsigned long search_exception_table(unsigned long);
75 * architectures with an MMU should override these two
77 #ifndef __copy_from_user
78 static inline __must_check long __copy_from_user(void *to,
79 const void __user * from, unsigned long n)
81 if (__builtin_constant_p(n)) {
82 switch(n) {
83 case 1:
84 *(u8 *)to = *(u8 __force *)from;
85 return 0;
86 case 2:
87 *(u16 *)to = *(u16 __force *)from;
88 return 0;
89 case 4:
90 *(u32 *)to = *(u32 __force *)from;
91 return 0;
92 #ifdef CONFIG_64BIT
93 case 8:
94 *(u64 *)to = *(u64 __force *)from;
95 return 0;
96 #endif
97 default:
98 break;
102 memcpy(to, (const void __force *)from, n);
103 return 0;
105 #endif
107 #ifndef __copy_to_user
108 static inline __must_check long __copy_to_user(void __user *to,
109 const void *from, unsigned long n)
111 if (__builtin_constant_p(n)) {
112 switch(n) {
113 case 1:
114 *(u8 __force *)to = *(u8 *)from;
115 return 0;
116 case 2:
117 *(u16 __force *)to = *(u16 *)from;
118 return 0;
119 case 4:
120 *(u32 __force *)to = *(u32 *)from;
121 return 0;
122 #ifdef CONFIG_64BIT
123 case 8:
124 *(u64 __force *)to = *(u64 *)from;
125 return 0;
126 #endif
127 default:
128 break;
132 memcpy((void __force *)to, from, n);
133 return 0;
135 #endif
138 * These are the main single-value transfer routines. They automatically
139 * use the right size if we just have the right pointer type.
140 * This version just falls back to copy_{from,to}_user, which should
141 * provide a fast-path for small values.
143 #define __put_user(x, ptr) \
144 ({ \
145 __typeof__(*(ptr)) __x = (x); \
146 int __pu_err = -EFAULT; \
147 __chk_user_ptr(ptr); \
148 switch (sizeof (*(ptr))) { \
149 case 1: \
150 case 2: \
151 case 4: \
152 case 8: \
153 __pu_err = __put_user_fn(sizeof (*(ptr)), \
154 ptr, &__x); \
155 break; \
156 default: \
157 __put_user_bad(); \
158 break; \
160 __pu_err; \
163 #define put_user(x, ptr) \
164 ({ \
165 might_sleep(); \
166 access_ok(VERIFY_WRITE, ptr, sizeof(*ptr)) ? \
167 __put_user(x, ptr) : \
168 -EFAULT; \
171 static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
173 size = __copy_to_user(ptr, x, size);
174 return size ? -EFAULT : size;
177 extern int __put_user_bad(void) __attribute__((noreturn));
179 #define __get_user(x, ptr) \
180 ({ \
181 int __gu_err = -EFAULT; \
182 __chk_user_ptr(ptr); \
183 switch (sizeof(*(ptr))) { \
184 case 1: { \
185 unsigned char __x; \
186 __gu_err = __get_user_fn(sizeof (*(ptr)), \
187 ptr, &__x); \
188 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
189 break; \
190 }; \
191 case 2: { \
192 unsigned short __x; \
193 __gu_err = __get_user_fn(sizeof (*(ptr)), \
194 ptr, &__x); \
195 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
196 break; \
197 }; \
198 case 4: { \
199 unsigned int __x; \
200 __gu_err = __get_user_fn(sizeof (*(ptr)), \
201 ptr, &__x); \
202 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
203 break; \
204 }; \
205 case 8: { \
206 unsigned long long __x; \
207 __gu_err = __get_user_fn(sizeof (*(ptr)), \
208 ptr, &__x); \
209 (x) = *(__force __typeof__(*(ptr)) *) &__x; \
210 break; \
211 }; \
212 default: \
213 __get_user_bad(); \
214 break; \
216 __gu_err; \
219 #define get_user(x, ptr) \
220 ({ \
221 might_sleep(); \
222 access_ok(VERIFY_READ, ptr, sizeof(*ptr)) ? \
223 __get_user(x, ptr) : \
224 -EFAULT; \
227 static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
229 size = __copy_from_user(x, ptr, size);
230 return size ? -EFAULT : size;
233 extern int __get_user_bad(void) __attribute__((noreturn));
235 #ifndef __copy_from_user_inatomic
236 #define __copy_from_user_inatomic __copy_from_user
237 #endif
239 #ifndef __copy_to_user_inatomic
240 #define __copy_to_user_inatomic __copy_to_user
241 #endif
243 static inline long copy_from_user(void *to,
244 const void __user * from, unsigned long n)
246 might_sleep();
247 if (access_ok(VERIFY_READ, from, n))
248 return __copy_from_user(to, from, n);
249 else
250 return n;
253 static inline long copy_to_user(void __user *to,
254 const void *from, unsigned long n)
256 might_sleep();
257 if (access_ok(VERIFY_WRITE, to, n))
258 return __copy_to_user(to, from, n);
259 else
260 return n;
264 * Copy a null terminated string from userspace.
266 #ifndef __strncpy_from_user
267 static inline long
268 __strncpy_from_user(char *dst, const char __user *src, long count)
270 char *tmp;
271 strncpy(dst, (const char __force *)src, count);
272 for (tmp = dst; *tmp && count > 0; tmp++, count--)
274 return (tmp - dst);
276 #endif
278 static inline long
279 strncpy_from_user(char *dst, const char __user *src, long count)
281 if (!access_ok(VERIFY_READ, src, 1))
282 return -EFAULT;
283 return __strncpy_from_user(dst, src, count);
287 * Return the size of a string (including the ending 0)
289 * Return 0 on exception, a value greater than N if too long
291 #ifndef __strnlen_user
292 #define __strnlen_user strnlen
293 #endif
295 static inline long strnlen_user(const char __user *src, long n)
297 if (!access_ok(VERIFY_READ, src, 1))
298 return 0;
299 return __strnlen_user(src, n);
302 static inline long strlen_user(const char __user *src)
304 return strnlen_user(src, 32767);
308 * Zero Userspace
310 #ifndef __clear_user
311 static inline __must_check unsigned long
312 __clear_user(void __user *to, unsigned long n)
314 memset((void __force *)to, 0, n);
315 return 0;
317 #endif
319 static inline __must_check unsigned long
320 clear_user(void __user *to, unsigned long n)
322 might_sleep();
323 if (!access_ok(VERIFY_WRITE, to, n))
324 return n;
326 return __clear_user(to, n);
329 #endif /* __ASM_GENERIC_UACCESS_H */