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1da177e4 LT |
1 | #ifndef _ASMARM_UACCESS_H |
2 | #define _ASMARM_UACCESS_H | |
3 | ||
4 | /* | |
5 | * User space memory access functions | |
6 | */ | |
7 | #include <linux/sched.h> | |
8 | #include <asm/errno.h> | |
9 | ||
10 | #define VERIFY_READ 0 | |
11 | #define VERIFY_WRITE 1 | |
12 | ||
13 | /* | |
14 | * The exception table consists of pairs of addresses: the first is the | |
15 | * address of an instruction that is allowed to fault, and the second is | |
16 | * the address at which the program should continue. No registers are | |
17 | * modified, so it is entirely up to the continuation code to figure out | |
18 | * what to do. | |
19 | * | |
20 | * All the routines below use bits of fixup code that are out of line | |
21 | * with the main instruction path. This means when everything is well, | |
22 | * we don't even have to jump over them. Further, they do not intrude | |
23 | * on our cache or tlb entries. | |
24 | */ | |
25 | ||
26 | struct exception_table_entry | |
27 | { | |
28 | unsigned long insn, fixup; | |
29 | }; | |
30 | ||
31 | /* Returns 0 if exception not found and fixup otherwise. */ | |
32 | extern unsigned long search_exception_table(unsigned long); | |
33 | extern int fixup_exception(struct pt_regs *regs); | |
34 | ||
35 | #define get_ds() (KERNEL_DS) | |
36 | #define get_fs() (current_thread_info()->addr_limit) | |
37 | #define segment_eq(a,b) ((a) == (b)) | |
38 | ||
39 | #include <asm/uaccess-asm.h> | |
40 | ||
41 | #define access_ok(type,addr,size) (__range_ok(addr,size) == 0) | |
42 | ||
43 | /* this function will go away soon - use access_ok() instead */ | |
44 | static inline int __deprecated verify_area(int type, const void * addr, unsigned long size) | |
45 | { | |
46 | return access_ok(type, addr, size) ? 0 : -EFAULT; | |
47 | } | |
48 | ||
49 | /* | |
50 | * Single-value transfer routines. They automatically use the right | |
51 | * size if we just have the right pointer type. Note that the functions | |
52 | * which read from user space (*get_*) need to take care not to leak | |
53 | * kernel data even if the calling code is buggy and fails to check | |
54 | * the return value. This means zeroing out the destination variable | |
55 | * or buffer on error. Normally this is done out of line by the | |
56 | * fixup code, but there are a few places where it intrudes on the | |
57 | * main code path. When we only write to user space, there is no | |
58 | * problem. | |
59 | * | |
60 | * The "__xxx" versions of the user access functions do not verify the | |
61 | * address space - it must have been done previously with a separate | |
62 | * "access_ok()" call. | |
63 | * | |
64 | * The "xxx_error" versions set the third argument to EFAULT if an | |
65 | * error occurs, and leave it unchanged on success. Note that these | |
66 | * versions are void (ie, don't return a value as such). | |
67 | */ | |
68 | ||
69 | extern int __get_user_1(void *); | |
70 | extern int __get_user_2(void *); | |
71 | extern int __get_user_4(void *); | |
72 | extern int __get_user_8(void *); | |
73 | extern int __get_user_bad(void); | |
74 | ||
75 | #define __get_user_x(__r1,__p,__e,__s,__i...) \ | |
76 | __asm__ __volatile__ ("bl __get_user_" #__s \ | |
77 | : "=&r" (__e), "=r" (__r1) \ | |
78 | : "0" (__p) \ | |
79 | : __i) | |
80 | ||
81 | #define get_user(x,p) \ | |
82 | ({ \ | |
83 | const register typeof(*(p)) *__p asm("r0") = (p); \ | |
84 | register typeof(*(p)) __r1 asm("r1"); \ | |
85 | register int __e asm("r0"); \ | |
86 | switch (sizeof(*(p))) { \ | |
87 | case 1: \ | |
88 | __get_user_x(__r1, __p, __e, 1, "lr"); \ | |
89 | break; \ | |
90 | case 2: \ | |
91 | __get_user_x(__r1, __p, __e, 2, "r2", "lr"); \ | |
92 | break; \ | |
93 | case 4: \ | |
94 | __get_user_x(__r1, __p, __e, 4, "lr"); \ | |
95 | break; \ | |
96 | case 8: \ | |
97 | __get_user_x(__r1, __p, __e, 8, "lr"); \ | |
98 | break; \ | |
99 | default: __e = __get_user_bad(); break; \ | |
100 | } \ | |
101 | x = __r1; \ | |
102 | __e; \ | |
103 | }) | |
104 | ||
105 | ||
106 | #define __get_user(x,ptr) \ | |
107 | ({ \ | |
108 | long __gu_err = 0; \ | |
109 | __get_user_err((x),(ptr),__gu_err); \ | |
110 | __gu_err; \ | |
111 | }) | |
112 | ||
113 | #define __get_user_error(x,ptr,err) \ | |
114 | ({ \ | |
115 | __get_user_err((x),(ptr),err); \ | |
116 | (void) 0; \ | |
117 | }) | |
118 | ||
119 | #define __get_user_err(x,ptr,err) \ | |
120 | do { \ | |
121 | unsigned long __gu_addr = (unsigned long)(ptr); \ | |
122 | unsigned long __gu_val; \ | |
123 | switch (sizeof(*(ptr))) { \ | |
124 | case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \ | |
125 | case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \ | |
126 | case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \ | |
127 | default: (__gu_val) = __get_user_bad(); \ | |
128 | } \ | |
129 | (x) = (__typeof__(*(ptr)))__gu_val; \ | |
130 | } while (0) | |
131 | ||
132 | extern int __put_user_1(void *, unsigned int); | |
133 | extern int __put_user_2(void *, unsigned int); | |
134 | extern int __put_user_4(void *, unsigned int); | |
135 | extern int __put_user_8(void *, unsigned long long); | |
136 | extern int __put_user_bad(void); | |
137 | ||
138 | #define __put_user_x(__r1,__p,__e,__s) \ | |
139 | __asm__ __volatile__ ( \ | |
140 | __asmeq("%0", "r0") __asmeq("%2", "r1") \ | |
141 | "bl __put_user_" #__s \ | |
142 | : "=&r" (__e) \ | |
143 | : "0" (__p), "r" (__r1) \ | |
144 | : "ip", "lr", "cc") | |
145 | ||
146 | #define put_user(x,p) \ | |
147 | ({ \ | |
148 | const register typeof(*(p)) __r1 asm("r1") = (x); \ | |
149 | const register typeof(*(p)) *__p asm("r0") = (p); \ | |
150 | register int __e asm("r0"); \ | |
151 | switch (sizeof(*(__p))) { \ | |
152 | case 1: \ | |
153 | __put_user_x(__r1, __p, __e, 1); \ | |
154 | break; \ | |
155 | case 2: \ | |
156 | __put_user_x(__r1, __p, __e, 2); \ | |
157 | break; \ | |
158 | case 4: \ | |
159 | __put_user_x(__r1, __p, __e, 4); \ | |
160 | break; \ | |
161 | case 8: \ | |
162 | __put_user_x(__r1, __p, __e, 8); \ | |
163 | break; \ | |
164 | default: __e = __put_user_bad(); break; \ | |
165 | } \ | |
166 | __e; \ | |
167 | }) | |
168 | ||
169 | #if 0 | |
170 | /********************* OLD METHOD *******************/ | |
171 | #define __put_user_x(__r1,__p,__e,__s,__i...) \ | |
172 | __asm__ __volatile__ ("bl __put_user_" #__s \ | |
173 | : "=&r" (__e) \ | |
174 | : "0" (__p), "r" (__r1) \ | |
175 | : __i) | |
176 | ||
177 | #define put_user(x,p) \ | |
178 | ({ \ | |
179 | const register typeof(*(p)) __r1 asm("r1") = (x); \ | |
180 | const register typeof(*(p)) *__p asm("r0") = (p); \ | |
181 | register int __e asm("r0"); \ | |
182 | switch (sizeof(*(p))) { \ | |
183 | case 1: \ | |
184 | __put_user_x(__r1, __p, __e, 1, "r2", "lr"); \ | |
185 | break; \ | |
186 | case 2: \ | |
187 | __put_user_x(__r1, __p, __e, 2, "r2", "lr"); \ | |
188 | break; \ | |
189 | case 4: \ | |
190 | __put_user_x(__r1, __p, __e, 4, "r2", "lr"); \ | |
191 | break; \ | |
192 | case 8: \ | |
193 | __put_user_x(__r1, __p, __e, 8, "r2", "ip", "lr"); \ | |
194 | break; \ | |
195 | default: __e = __put_user_bad(); break; \ | |
196 | } \ | |
197 | __e; \ | |
198 | }) | |
199 | /*************************************************/ | |
200 | #endif | |
201 | ||
202 | #define __put_user(x,ptr) \ | |
203 | ({ \ | |
204 | long __pu_err = 0; \ | |
205 | __put_user_err((x),(ptr),__pu_err); \ | |
206 | __pu_err; \ | |
207 | }) | |
208 | ||
209 | #define __put_user_error(x,ptr,err) \ | |
210 | ({ \ | |
211 | __put_user_err((x),(ptr),err); \ | |
212 | (void) 0; \ | |
213 | }) | |
214 | ||
215 | #define __put_user_err(x,ptr,err) \ | |
216 | do { \ | |
217 | unsigned long __pu_addr = (unsigned long)(ptr); \ | |
218 | __typeof__(*(ptr)) __pu_val = (x); \ | |
219 | switch (sizeof(*(ptr))) { \ | |
220 | case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \ | |
221 | case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \ | |
222 | case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \ | |
223 | case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \ | |
224 | default: __put_user_bad(); \ | |
225 | } \ | |
226 | } while (0) | |
227 | ||
228 | static __inline__ unsigned long copy_from_user(void *to, const void *from, unsigned long n) | |
229 | { | |
230 | if (access_ok(VERIFY_READ, from, n)) | |
231 | __do_copy_from_user(to, from, n); | |
232 | else /* security hole - plug it */ | |
233 | memzero(to, n); | |
234 | return n; | |
235 | } | |
236 | ||
237 | static __inline__ unsigned long __copy_from_user(void *to, const void *from, unsigned long n) | |
238 | { | |
239 | __do_copy_from_user(to, from, n); | |
240 | return n; | |
241 | } | |
242 | ||
243 | static __inline__ unsigned long copy_to_user(void *to, const void *from, unsigned long n) | |
244 | { | |
245 | if (access_ok(VERIFY_WRITE, to, n)) | |
246 | __do_copy_to_user(to, from, n); | |
247 | return n; | |
248 | } | |
249 | ||
250 | static __inline__ unsigned long __copy_to_user(void *to, const void *from, unsigned long n) | |
251 | { | |
252 | __do_copy_to_user(to, from, n); | |
253 | return n; | |
254 | } | |
255 | ||
256 | #define __copy_to_user_inatomic __copy_to_user | |
257 | #define __copy_from_user_inatomic __copy_from_user | |
258 | ||
259 | static __inline__ unsigned long clear_user (void *to, unsigned long n) | |
260 | { | |
261 | if (access_ok(VERIFY_WRITE, to, n)) | |
262 | __do_clear_user(to, n); | |
263 | return n; | |
264 | } | |
265 | ||
266 | static __inline__ unsigned long __clear_user (void *to, unsigned long n) | |
267 | { | |
268 | __do_clear_user(to, n); | |
269 | return n; | |
270 | } | |
271 | ||
272 | static __inline__ long strncpy_from_user (char *dst, const char *src, long count) | |
273 | { | |
274 | long res = -EFAULT; | |
275 | if (access_ok(VERIFY_READ, src, 1)) | |
276 | __do_strncpy_from_user(dst, src, count, res); | |
277 | return res; | |
278 | } | |
279 | ||
280 | static __inline__ long __strncpy_from_user (char *dst, const char *src, long count) | |
281 | { | |
282 | long res; | |
283 | __do_strncpy_from_user(dst, src, count, res); | |
284 | return res; | |
285 | } | |
286 | ||
287 | #define strlen_user(s) strnlen_user(s, ~0UL >> 1) | |
288 | ||
289 | static inline long strnlen_user(const char *s, long n) | |
290 | { | |
291 | unsigned long res = 0; | |
292 | ||
293 | if (__addr_ok(s)) | |
294 | __do_strnlen_user(s, n, res); | |
295 | ||
296 | return res; | |
297 | } | |
298 | ||
299 | #endif /* _ASMARM_UACCESS_H */ |