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[TG3]: Add tagged status support.
[linux-2.6/verdex.git] / include / asm-arm / uaccess.h
bloba7c018b8a0d4b88f7da350709a94558dd103d3aa
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 /* this function will go away soon - use access_ok() instead */
81 static inline int __deprecated verify_area(int type, const void __user *addr, unsigned long size)
82 {
83 return access_ok(type, addr, size) ? 0 : -EFAULT;
84 }
85
86 /*
87 * Single-value transfer routines. They automatically use the right
88 * size if we just have the right pointer type. Note that the functions
89 * which read from user space (*get_*) need to take care not to leak
90 * kernel data even if the calling code is buggy and fails to check
91 * the return value. This means zeroing out the destination variable
92 * or buffer on error. Normally this is done out of line by the
93 * fixup code, but there are a few places where it intrudes on the
94 * main code path. When we only write to user space, there is no
95 * problem.
96 *
97 * The "__xxx" versions of the user access functions do not verify the
98 * address space - it must have been done previously with a separate
99 * "access_ok()" call.
100 *
101 * The "xxx_error" versions set the third argument to EFAULT if an
102 * error occurs, and leave it unchanged on success. Note that these
103 * versions are void (ie, don't return a value as such).
104 */
105
106 extern int __get_user_1(void *);
107 extern int __get_user_2(void *);
108 extern int __get_user_4(void *);
109 extern int __get_user_8(void *);
110 extern int __get_user_bad(void);
111
112 #define __get_user_x(__r2,__p,__e,__s,__i...) \
113 __asm__ __volatile__ ( \
114 __asmeq("%0", "r0") __asmeq("%1", "r2") \
115 "bl __get_user_" #__s \
116 : "=&r" (__e), "=r" (__r2) \
117 : "0" (__p) \
118 : __i, "cc")
119
120 #define get_user(x,p) \
121 ({ \
122 const register typeof(*(p)) __user *__p asm("r0") = (p);\
123 register typeof(*(p)) __r2 asm("r2"); \
124 register int __e asm("r0"); \
125 switch (sizeof(*(__p))) { \
126 case 1: \
127 __get_user_x(__r2, __p, __e, 1, "lr"); \
128 break; \
129 case 2: \
130 __get_user_x(__r2, __p, __e, 2, "r3", "lr"); \
131 break; \
132 case 4: \
133 __get_user_x(__r2, __p, __e, 4, "lr"); \
134 break; \
135 case 8: \
136 __get_user_x(__r2, __p, __e, 8, "lr"); \
137 break; \
138 default: __e = __get_user_bad(); break; \
139 } \
140 x = __r2; \
141 __e; \
142 })
143
144 #define __get_user(x,ptr) \
145 ({ \
146 long __gu_err = 0; \
147 __get_user_err((x),(ptr),__gu_err); \
148 __gu_err; \
149 })
150
151 #define __get_user_error(x,ptr,err) \
152 ({ \
153 __get_user_err((x),(ptr),err); \
154 (void) 0; \
155 })
156
157 #define __get_user_err(x,ptr,err) \
158 do { \
159 unsigned long __gu_addr = (unsigned long)(ptr); \
160 unsigned long __gu_val; \
161 __chk_user_ptr(ptr); \
162 switch (sizeof(*(ptr))) { \
163 case 1: __get_user_asm_byte(__gu_val,__gu_addr,err); break; \
164 case 2: __get_user_asm_half(__gu_val,__gu_addr,err); break; \
165 case 4: __get_user_asm_word(__gu_val,__gu_addr,err); break; \
166 default: (__gu_val) = __get_user_bad(); \
167 } \
168 (x) = (__typeof__(*(ptr)))__gu_val; \
169 } while (0)
170
171 #define __get_user_asm_byte(x,addr,err) \
172 __asm__ __volatile__( \
173 "1: ldrbt %1,[%2],#0\n" \
174 "2:\n" \
175 " .section .fixup,\"ax\"\n" \
176 " .align 2\n" \
177 "3: mov %0, %3\n" \
178 " mov %1, #0\n" \
179 " b 2b\n" \
180 " .previous\n" \
181 " .section __ex_table,\"a\"\n" \
182 " .align 3\n" \
183 " .long 1b, 3b\n" \
184 " .previous" \
185 : "+r" (err), "=&r" (x) \
186 : "r" (addr), "i" (-EFAULT) \
187 : "cc")
188
189 #ifndef __ARMEB__
190 #define __get_user_asm_half(x,__gu_addr,err) \
191 ({ \
192 unsigned long __b1, __b2; \
193 __get_user_asm_byte(__b1, __gu_addr, err); \
194 __get_user_asm_byte(__b2, __gu_addr + 1, err); \
195 (x) = __b1 | (__b2 << 8); \
196 })
197 #else
198 #define __get_user_asm_half(x,__gu_addr,err) \
199 ({ \
200 unsigned long __b1, __b2; \
201 __get_user_asm_byte(__b1, __gu_addr, err); \
202 __get_user_asm_byte(__b2, __gu_addr + 1, err); \
203 (x) = (__b1 << 8) | __b2; \
204 })
205 #endif
206
207 #define __get_user_asm_word(x,addr,err) \
208 __asm__ __volatile__( \
209 "1: ldrt %1,[%2],#0\n" \
210 "2:\n" \
211 " .section .fixup,\"ax\"\n" \
212 " .align 2\n" \
213 "3: mov %0, %3\n" \
214 " mov %1, #0\n" \
215 " b 2b\n" \
216 " .previous\n" \
217 " .section __ex_table,\"a\"\n" \
218 " .align 3\n" \
219 " .long 1b, 3b\n" \
220 " .previous" \
221 : "+r" (err), "=&r" (x) \
222 : "r" (addr), "i" (-EFAULT) \
223 : "cc")
224
225 extern int __put_user_1(void *, unsigned int);
226 extern int __put_user_2(void *, unsigned int);
227 extern int __put_user_4(void *, unsigned int);
228 extern int __put_user_8(void *, unsigned long long);
229 extern int __put_user_bad(void);
230
231 #define __put_user_x(__r2,__p,__e,__s) \
232 __asm__ __volatile__ ( \
233 __asmeq("%0", "r0") __asmeq("%2", "r2") \
234 "bl __put_user_" #__s \
235 : "=&r" (__e) \
236 : "0" (__p), "r" (__r2) \
237 : "ip", "lr", "cc")
238
239 #define put_user(x,p) \
240 ({ \
241 const register typeof(*(p)) __r2 asm("r2") = (x); \
242 const register typeof(*(p)) __user *__p asm("r0") = (p);\
243 register int __e asm("r0"); \
244 switch (sizeof(*(__p))) { \
245 case 1: \
246 __put_user_x(__r2, __p, __e, 1); \
247 break; \
248 case 2: \
249 __put_user_x(__r2, __p, __e, 2); \
250 break; \
251 case 4: \
252 __put_user_x(__r2, __p, __e, 4); \
253 break; \
254 case 8: \
255 __put_user_x(__r2, __p, __e, 8); \
256 break; \
257 default: __e = __put_user_bad(); break; \
258 } \
259 __e; \
260 })
261
262 #define __put_user(x,ptr) \
263 ({ \
264 long __pu_err = 0; \
265 __put_user_err((x),(ptr),__pu_err); \
266 __pu_err; \
267 })
268
269 #define __put_user_error(x,ptr,err) \
270 ({ \
271 __put_user_err((x),(ptr),err); \
272 (void) 0; \
273 })
274
275 #define __put_user_err(x,ptr,err) \
276 do { \
277 unsigned long __pu_addr = (unsigned long)(ptr); \
278 __typeof__(*(ptr)) __pu_val = (x); \
279 __chk_user_ptr(ptr); \
280 switch (sizeof(*(ptr))) { \
281 case 1: __put_user_asm_byte(__pu_val,__pu_addr,err); break; \
282 case 2: __put_user_asm_half(__pu_val,__pu_addr,err); break; \
283 case 4: __put_user_asm_word(__pu_val,__pu_addr,err); break; \
284 case 8: __put_user_asm_dword(__pu_val,__pu_addr,err); break; \
285 default: __put_user_bad(); \
286 } \
287 } while (0)
288
289 #define __put_user_asm_byte(x,__pu_addr,err) \
290 __asm__ __volatile__( \
291 "1: strbt %1,[%2],#0\n" \
292 "2:\n" \
293 " .section .fixup,\"ax\"\n" \
294 " .align 2\n" \
295 "3: mov %0, %3\n" \
296 " b 2b\n" \
297 " .previous\n" \
298 " .section __ex_table,\"a\"\n" \
299 " .align 3\n" \
300 " .long 1b, 3b\n" \
301 " .previous" \
302 : "+r" (err) \
303 : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
304 : "cc")
305
306 #ifndef __ARMEB__
307 #define __put_user_asm_half(x,__pu_addr,err) \
308 ({ \
309 unsigned long __temp = (unsigned long)(x); \
310 __put_user_asm_byte(__temp, __pu_addr, err); \
311 __put_user_asm_byte(__temp >> 8, __pu_addr + 1, err); \
312 })
313 #else
314 #define __put_user_asm_half(x,__pu_addr,err) \
315 ({ \
316 unsigned long __temp = (unsigned long)(x); \
317 __put_user_asm_byte(__temp >> 8, __pu_addr, err); \
318 __put_user_asm_byte(__temp, __pu_addr + 1, err); \
319 })
320 #endif
321
322 #define __put_user_asm_word(x,__pu_addr,err) \
323 __asm__ __volatile__( \
324 "1: strt %1,[%2],#0\n" \
325 "2:\n" \
326 " .section .fixup,\"ax\"\n" \
327 " .align 2\n" \
328 "3: mov %0, %3\n" \
329 " b 2b\n" \
330 " .previous\n" \
331 " .section __ex_table,\"a\"\n" \
332 " .align 3\n" \
333 " .long 1b, 3b\n" \
334 " .previous" \
335 : "+r" (err) \
336 : "r" (x), "r" (__pu_addr), "i" (-EFAULT) \
337 : "cc")
338
339 #ifndef __ARMEB__
340 #define __reg_oper0 "%R2"
341 #define __reg_oper1 "%Q2"
342 #else
343 #define __reg_oper0 "%Q2"
344 #define __reg_oper1 "%R2"
345 #endif
346
347 #define __put_user_asm_dword(x,__pu_addr,err) \
348 __asm__ __volatile__( \
349 "1: strt " __reg_oper1 ", [%1], #4\n" \
350 "2: strt " __reg_oper0 ", [%1], #0\n" \
351 "3:\n" \
352 " .section .fixup,\"ax\"\n" \
353 " .align 2\n" \
354 "4: mov %0, %3\n" \
355 " b 3b\n" \
356 " .previous\n" \
357 " .section __ex_table,\"a\"\n" \
358 " .align 3\n" \
359 " .long 1b, 4b\n" \
360 " .long 2b, 4b\n" \
361 " .previous" \
362 : "+r" (err), "+r" (__pu_addr) \
363 : "r" (x), "i" (-EFAULT) \
364 : "cc")
365
366 extern unsigned long __arch_copy_from_user(void *to, const void __user *from, unsigned long n);
367 extern unsigned long __arch_copy_to_user(void __user *to, const void *from, unsigned long n);
368 extern unsigned long __arch_clear_user(void __user *addr, unsigned long n);
369 extern unsigned long __arch_strncpy_from_user(char *to, const char __user *from, unsigned long count);
370 extern unsigned long __arch_strnlen_user(const char __user *s, long n);
371
372 static inline unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
373 {
374 if (access_ok(VERIFY_READ, from, n))
375 n = __arch_copy_from_user(to, from, n);
376 else /* security hole - plug it */
377 memzero(to, n);
378 return n;
379 }
380
381 static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
382 {
383 return __arch_copy_from_user(to, from, n);
384 }
385
386 static inline unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
387 {
388 if (access_ok(VERIFY_WRITE, to, n))
389 n = __arch_copy_to_user(to, from, n);
390 return n;
391 }
392
393 static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
394 {
395 return __arch_copy_to_user(to, from, n);
396 }
397
398 #define __copy_to_user_inatomic __copy_to_user
399 #define __copy_from_user_inatomic __copy_from_user
400
401 static inline unsigned long clear_user (void __user *to, unsigned long n)
402 {
403 if (access_ok(VERIFY_WRITE, to, n))
404 n = __arch_clear_user(to, n);
405 return n;
406 }
407
408 static inline unsigned long __clear_user (void __user *to, unsigned long n)
409 {
410 return __arch_clear_user(to, n);
411 }
412
413 static inline long strncpy_from_user (char *dst, const char __user *src, long count)
414 {
415 long res = -EFAULT;
416 if (access_ok(VERIFY_READ, src, 1))
417 res = __arch_strncpy_from_user(dst, src, count);
418 return res;
419 }
420
421 static inline long __strncpy_from_user (char *dst, const char __user *src, long count)
422 {
423 return __arch_strncpy_from_user(dst, src, count);
424 }
425
426 #define strlen_user(s) strnlen_user(s, ~0UL >> 1)
427
428 static inline long strnlen_user(const char __user *s, long n)
429 {
430 unsigned long res = 0;
431
432 if (__addr_ok(s))
433 res = __arch_strnlen_user(s, n);
434
435 return res;
436 }
437
438 #endif /* _ASMARM_UACCESS_H */
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