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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / include / asm-arm / uaccess.h
blobf36715246407d67bd4e979d6c5c93896d499ea6a
1 /*
2 * linux/include/asm-arm/uaccess.h
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8 #ifndef _ASMARM_UACCESS_H
9 #define _ASMARM_UACCESS_H
10
11 /*
12 * User space memory access functions
13 */
14 #include <linux/sched.h>
15 #include <asm/errno.h>
16 #include <asm/memory.h>
17 #include <asm/domain.h>
18 #include <asm/system.h>
19
20 #define VERIFY_READ 0
21 #define VERIFY_WRITE 1
22
23 /*
24 * The exception table consists of pairs of addresses: the first is the
25 * address of an instruction that is allowed to fault, and the second is
26 * the address at which the program should continue. No registers are
27 * modified, so it is entirely up to the continuation code to figure out
28 * what to do.
29 *
30 * All the routines below use bits of fixup code that are out of line
31 * with the main instruction path. This means when everything is well,
32 * we don't even have to jump over them. Further, they do not intrude
33 * on our cache or tlb entries.
34 */
35
36 struct exception_table_entry
37 {
38 unsigned long insn, fixup;
39 };
40
41 extern int fixup_exception(struct pt_regs *regs);
42
43 /*
44 * Note that this is actually 0x1,0000,0000
45 */
46 #define KERNEL_DS 0x00000000
47 #define USER_DS TASK_SIZE
48
49 #define get_ds() (KERNEL_DS)
50 #define get_fs() (current_thread_info()->addr_limit)
51
52 static inline void set_fs (mm_segment_t fs)
53 {
54 current_thread_info()->addr_limit = fs;
55 modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
56 }
57
58 #define segment_eq(a,b) ((a) == (b))
59
60 #define __addr_ok(addr) ({ \
61 unsigned long flag; \
62 __asm__("cmp %2, %0; movlo %0, #0" \
63 : "=&r" (flag) \
64 : "0" (current_thread_info()->addr_limit), "r" (addr) \
65 : "cc"); \
66 (flag == 0); })
67
68 /* We use 33-bit arithmetic here... */
69 #define __range_ok(addr,size) ({ \
70 unsigned long flag, sum; \
71 __chk_user_ptr(addr); \
72 __asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
73 : "=&r" (flag), "=&r" (sum) \
74 : "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
75 : "cc"); \
76 flag; })
77
78 #define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
79
80 static inline int verify_area(int type, const void __user *addr, unsigned long size)
81 {
82 return access_ok(type, addr, size) ? 0 : -EFAULT;
83 }
84
85 /*
86 * Single-value transfer routines. They automatically use the right
87 * size if we just have the right pointer type. Note that the functions
88 * which read from user space (*get_*) need to take care not to leak
89 * kernel data even if the calling code is buggy and fails to check
90 * the return value. This means zeroing out the destination variable
91 * or buffer on error. Normally this is done out of line by the
92 * fixup code, but there are a few places where it intrudes on the
93 * main code path. When we only write to user space, there is no
94 * problem.
95 *
96 * The "__xxx" versions of the user access functions do not verify the
97 * address space - it must have been done previously with a separate
98 * "access_ok()" call.
99 *
100 * The "xxx_error" versions set the third argument to EFAULT if an
101 * error occurs, and leave it unchanged on success. Note that these
102 * versions are void (ie, don't return a value as such).
103 */
104
105 extern int __get_user_1(void *);
106 extern int __get_user_2(void *);
107 extern int __get_user_4(void *);
108 extern int __get_user_8(void *);
109 extern int __get_user_bad(void);
110
111 #define __get_user_x(__r1,__p,__e,__s,__i...) \
112 __asm__ __volatile__ ( \
113 __asmeq("%0", "r0") __asmeq("%1", "r1") \
114 "bl __get_user_" #__s \
115 : "=&r" (__e), "=r" (__r1) \
116 : "0" (__p) \
117 : __i, "cc")
118
119 #define get_user(x,p) \
120 ({ \
121 const register typeof(*(p)) __user *__p asm("r0") = (p);\
122 register typeof(*(p)) __r1 asm("r1"); \
123 register int __e asm("r0"); \
124 switch (sizeof(*(__p))) { \
125 case 1: \
126 __get_user_x(__r1, __p, __e, 1, "lr"); \
127 break; \
128 case 2: \
129 __get_user_x(__r1, __p, __e, 2, "r2", "lr"); \
130 break; \
131 case 4: \
132 __get_user_x(__r1, __p, __e, 4, "lr"); \
133 break; \
134 case 8: \
135 __get_user_x(__r1, __p, __e, 8, "lr"); \
136 break; \
137 default: __e = __get_user_bad(); break; \
138 } \
139 x = __r1; \
140 __e; \
141 })
142
143 #define __get_user(x,ptr) \
144 ({ \
145 long __gu_err = 0; \
146 __get_user_err((x),(ptr),__gu_err); \
147 __gu_err; \
148 })
149
150 #define __get_user_error(x,ptr,err) \
151 ({ \
152 __get_user_err((x),(ptr),err); \
153 (void) 0; \
154 })
155
156 #define __get_user_err(x,ptr,err) \
157 do { \
158 unsigned long __gu_addr = (unsigned long)(ptr); \
159 unsigned long __gu_val; \
160 __chk_user_ptr(ptr); \
161 switch (sizeof(*(ptr))) { \
162 case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
163 case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
164 case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
165 default: (__gu_val) = __get_user_bad(); \
166 } \
167 (x) = (__typeof__(*(ptr)))__gu_val; \
168 } while (0)
169
170 #define __get_user_asm_byte(x,addr,err) \
171 __asm__ __volatile__( \
172 "1: ldrbt %1,[%2],#0\n" \
173 "2:\n" \
174 " .section .fixup,\"ax\"\n" \
175 " .align 2\n" \
176 "3: mov %0, %3\n" \
177 " mov %1, #0\n" \
178 " b 2b\n" \
179 " .previous\n" \
180 " .section __ex_table,\"a\"\n" \
181 " .align 3\n" \
182 " .long 1b, 3b\n" \
183 " .previous" \
184 : "+r" (err), "=&r" (x) \
185 : "r" (addr), "i" (-EFAULT) \
186 : "cc")
187
188 #ifndef __ARMEB__
189 #define __get_user_asm_half(x,__gu_addr,err) \
190 ({ \
191 unsigned long __b1, __b2; \
192 __get_user_asm_byte(__b1, __gu_addr, err); \
193 __get_user_asm_byte(__b2, __gu_addr + 1, err); \
194 (x) = __b1 | (__b2 << 8); \
195 })
196 #else
197 #define __get_user_asm_half(x,__gu_addr,err) \
198 ({ \
199 unsigned long __b1, __b2; \
200 __get_user_asm_byte(__b1, __gu_addr, err); \
201 __get_user_asm_byte(__b2, __gu_addr + 1, err); \
202 (x) = (__b1 << 8) | __b2; \
203 })
204 #endif
205
206 #define __get_user_asm_word(x,addr,err) \
207 __asm__ __volatile__( \
208 "1: ldrt %1,[%2],#0\n" \
209 "2:\n" \
210 " .section .fixup,\"ax\"\n" \
211 " .align 2\n" \
212 "3: mov %0, %3\n" \
213 " mov %1, #0\n" \
214 " b 2b\n" \
215 " .previous\n" \
216 " .section __ex_table,\"a\"\n" \
217 " .align 3\n" \
218 " .long 1b, 3b\n" \
219 " .previous" \
220 : "+r" (err), "=&r" (x) \
221 : "r" (addr), "i" (-EFAULT) \
222 : "cc")
223
224 extern int __put_user_1(void *, unsigned int);
225 extern int __put_user_2(void *, unsigned int);
226 extern int __put_user_4(void *, unsigned int);
227 extern int __put_user_8(void *, unsigned long long);
228 extern int __put_user_bad(void);
229
230 #define __put_user_x(__r1,__p,__e,__s) \
231 __asm__ __volatile__ ( \
232 __asmeq("%0", "r0") __asmeq("%2", "r1") \
233 "bl __put_user_" #__s \
234 : "=&r" (__e) \
235 : "0" (__p), "r" (__r1) \
236 : "ip", "lr", "cc")
237
238 #define put_user(x,p) \
239 ({ \
240 const register typeof(*(p)) __r1 asm("r1") = (x); \
241 const register typeof(*(p)) __user *__p asm("r0") = (p);\
242 register int __e asm("r0"); \
243 switch (sizeof(*(__p))) { \
244 case 1: \
245 __put_user_x(__r1, __p, __e, 1); \
246 break; \
247 case 2: \
248 __put_user_x(__r1, __p, __e, 2); \
249 break; \
250 case 4: \
251 __put_user_x(__r1, __p, __e, 4); \
252 break; \
253 case 8: \
254 __put_user_x(__r1, __p, __e, 8); \
255 break; \
256 default: __e = __put_user_bad(); break; \
257 } \
258 __e; \
259 })
260
261 #define __put_user(x,ptr) \
262 ({ \
263 long __pu_err = 0; \
264 __put_user_err((x),(ptr),__pu_err); \
265 __pu_err; \
266 })
267
268 #define __put_user_error(x,ptr,err) \
269 ({ \
270 __put_user_err((x),(ptr),err); \
271 (void) 0; \
272 })
273
274 #define __put_user_err(x,ptr,err) \
275 do { \
276 unsigned long __pu_addr = (unsigned long)(ptr); \
277 __typeof__(*(ptr)) __pu_val = (x); \
278 __chk_user_ptr(ptr); \
279 switch (sizeof(*(ptr))) { \
280 case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
281 case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
282 case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
283 case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
284 default: __put_user_bad(); \
285 } \
286 } while (0)
287
288 #define __put_user_asm_byte(x,__pu_addr,err) \
289 __asm__ __volatile__( \
290 "1: strbt %1,[%2],#0\n" \
291 "2:\n" \
292 " .section .fixup,\"ax\"\n" \
293 " .align 2\n" \
294 "3: mov %0, %3\n" \
295 " b 2b\n" \
296 " .previous\n" \
297 " .section __ex_table,\"a\"\n" \
298 " .align 3\n" \
299 " .long 1b, 3b\n" \
300 " .previous" \
301 : "+r" (err) \
302 : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
303 : "cc")
304
305 #ifndef __ARMEB__
306 #define __put_user_asm_half(x,__pu_addr,err) \
307 ({ \
308 unsigned long __temp = (unsigned long)(x); \
309 __put_user_asm_byte(__temp, __pu_addr, err); \
310 __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
311 })
312 #else
313 #define __put_user_asm_half(x,__pu_addr,err) \
314 ({ \
315 unsigned long __temp = (unsigned long)(x); \
316 __put_user_asm_byte(__temp >> 8, __pu_addr, err); \
317 __put_user_asm_byte(__temp, __pu_addr + 1, err); \
318 })
319 #endif
320
321 #define __put_user_asm_word(x,__pu_addr,err) \
322 __asm__ __volatile__( \
323 "1: strt %1,[%2],#0\n" \
324 "2:\n" \
325 " .section .fixup,\"ax\"\n" \
326 " .align 2\n" \
327 "3: mov %0, %3\n" \
328 " b 2b\n" \
329 " .previous\n" \
330 " .section __ex_table,\"a\"\n" \
331 " .align 3\n" \
332 " .long 1b, 3b\n" \
333 " .previous" \
334 : "+r" (err) \
335 : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
336 : "cc")
337
338 #ifndef __ARMEB__
339 #define __reg_oper0 "%R2"
340 #define __reg_oper1 "%Q2"
341 #else
342 #define __reg_oper0 "%Q2"
343 #define __reg_oper1 "%R2"
344 #endif
345
346 #define __put_user_asm_dword(x,__pu_addr,err) \
347 __asm__ __volatile__( \
348 "1: strt " __reg_oper1 ", [%1], #4\n" \
349 "2: strt " __reg_oper0 ", [%1], #0\n" \
350 "3:\n" \
351 " .section .fixup,\"ax\"\n" \
352 " .align 2\n" \
353 "4: mov %0, %3\n" \
354 " b 3b\n" \
355 " .previous\n" \
356 " .section __ex_table,\"a\"\n" \
357 " .align 3\n" \
358 " .long 1b, 4b\n" \
359 " .long 2b, 4b\n" \
360 " .previous" \
361 : "+r" (err), "+r" (__pu_addr) \
362 : "r" (x), "i" (-EFAULT) \
363 : "cc")
364
365 extern unsigned long __arch_copy_from_user(void *to, const void __user *from, unsigned long n);
366 extern unsigned long __arch_copy_to_user(void __user *to, const void *from, unsigned long n);
367 extern unsigned long __arch_clear_user(void __user *addr, unsigned long n);
368 extern unsigned long __arch_strncpy_from_user(char *to, const char __user *from, unsigned long count);
369 extern unsigned long __arch_strnlen_user(const char __user *s, long n);
370
371 static inline unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
372 {
373 if (access_ok(VERIFY_READ, from, n))
374 n = __arch_copy_from_user(to, from, n);
375 else /* security hole - plug it */
376 memzero(to, n);
377 return n;
378 }
379
380 static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
381 {
382 return __arch_copy_from_user(to, from, n);
383 }
384
385 static inline unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
386 {
387 if (access_ok(VERIFY_WRITE, to, n))
388 n = __arch_copy_to_user(to, from, n);
389 return n;
390 }
391
392 static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
393 {
394 return __arch_copy_to_user(to, from, n);
395 }
396
397 #define __copy_to_user_inatomic __copy_to_user
398 #define __copy_from_user_inatomic __copy_from_user
399
400 static inline unsigned long clear_user (void __user *to, unsigned long n)
401 {
402 if (access_ok(VERIFY_WRITE, to, n))
403 n = __arch_clear_user(to, n);
404 return n;
405 }
406
407 static inline unsigned long __clear_user (void __user *to, unsigned long n)
408 {
409 return __arch_clear_user(to, n);
410 }
411
412 static inline long strncpy_from_user (char *dst, const char __user *src, long count)
413 {
414 long res = -EFAULT;
415 if (access_ok(VERIFY_READ, src, 1))
416 res = __arch_strncpy_from_user(dst, src, count);
417 return res;
418 }
419
420 static inline long __strncpy_from_user (char *dst, const char __user *src, long count)
421 {
422 return __arch_strncpy_from_user(dst, src, count);
423 }
424
425 #define strlen_user(s) strnlen_user(s, ~0UL >> 1)
426
427 static inline long strnlen_user(const char __user *s, long n)
428 {
429 unsigned long res = 0;
430
431 if (__addr_ok(s))
432 res = __arch_strnlen_user(s, n);
433
434 return res;
435 }
436
437 #endif /* _ASMARM_UACCESS_H */
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