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initial commit with v2.6.9
[linux-2.6.9-moxart.git] / include / asm-mips / uaccess.h
blobadbb24bd920f50deabe28c74a53c9c64dc1497c8
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 03, 04 by Ralf Baechle
7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
8 */
9 #ifndef _ASM_UACCESS_H
10 #define _ASM_UACCESS_H
11
12 #include <linux/config.h>
13 #include <linux/compiler.h>
14 #include <linux/errno.h>
15 #include <linux/thread_info.h>
16 #include <asm-generic/uaccess.h>
17
18 /*
19 * The fs value determines whether argument validity checking should be
20 * performed or not. If get_fs() == USER_DS, checking is performed, with
21 * get_fs() == KERNEL_DS, checking is bypassed.
22 *
23 * For historical reasons, these macros are grossly misnamed.
24 */
25 #ifdef CONFIG_MIPS32
26
27 #define __UA_LIMIT 0x80000000UL
28
29 #define __UA_ADDR ".word"
30 #define __UA_LA "la"
31 #define __UA_ADDU "addu"
32 #define __UA_t0 "$8"
33 #define __UA_t1 "$9"
34
35 #endif /* CONFIG_MIPS32 */
36
37 #ifdef CONFIG_MIPS64
38
39 #define __UA_LIMIT (- TASK_SIZE)
40
41 #define __UA_ADDR ".dword"
42 #define __UA_LA "dla"
43 #define __UA_ADDU "daddu"
44 #define __UA_t0 "$12"
45 #define __UA_t1 "$13"
46
47 #endif /* CONFIG_MIPS64 */
48
49 /*
50 * USER_DS is a bitmask that has the bits set that may not be set in a valid
51 * userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but
52 * the arithmetic we're doing only works if the limit is a power of two, so
53 * we use 0x80000000 here on 32-bit kernels. If a process passes an invalid
54 * address in this range it's the process's problem, not ours :-)
55 */
56
57 #define KERNEL_DS ((mm_segment_t) { 0UL })
58 #define USER_DS ((mm_segment_t) { __UA_LIMIT })
59
60 #define VERIFY_READ 0
61 #define VERIFY_WRITE 1
62
63 #define get_ds() (KERNEL_DS)
64 #define get_fs() (current_thread_info()->addr_limit)
65 #define set_fs(x) (current_thread_info()->addr_limit = (x))
66
67 #define segment_eq(a,b) ((a).seg == (b).seg)
68
69
70 /*
71 * Is a address valid? This does a straighforward calculation rather
72 * than tests.
73 *
74 * Address valid if:
75 * - "addr" doesn't have any high-bits set
76 * - AND "size" doesn't have any high-bits set
77 * - AND "addr+size" doesn't have any high-bits set
78 * - OR we are in kernel mode.
79 *
80 * __ua_size() is a trick to avoid runtime checking of positive constant
81 * sizes; for those we already know at compile time that the size is ok.
82 */
83 #define __ua_size(size) \
84 ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
85
86 /*
87 * access_ok: - Checks if a user space pointer is valid
88 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
89 * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
90 * to write to a block, it is always safe to read from it.
91 * @addr: User space pointer to start of block to check
92 * @size: Size of block to check
93 *
94 * Context: User context only. This function may sleep.
95 *
96 * Checks if a pointer to a block of memory in user space is valid.
97 *
98 * Returns true (nonzero) if the memory block may be valid, false (zero)
99 * if it is definitely invalid.
100 *
101 * Note that, depending on architecture, this function probably just
102 * checks that the pointer is in the user space range - after calling
103 * this function, memory access functions may still return -EFAULT.
104 */
105
106 #define __access_mask get_fs().seg
107
108 #define __access_ok(addr, size, mask) \
109 (((signed long)((mask) & ((addr) | ((addr) + (size)) | __ua_size(size)))) == 0)
110
111 #define access_ok(type, addr, size) \
112 likely(__access_ok((unsigned long)(addr), (size),__access_mask))
113
114 /*
115 * verify_area: - Obsolete, use access_ok()
116 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE
117 * @addr: User space pointer to start of block to check
118 * @size: Size of block to check
119 *
120 * Context: User context only. This function may sleep.
121 *
122 * This function has been replaced by access_ok().
123 *
124 * Checks if a pointer to a block of memory in user space is valid.
125 *
126 * Returns zero if the memory block may be valid, -EFAULT
127 * if it is definitely invalid.
128 *
129 * See access_ok() for more details.
130 */
131 static inline int verify_area(int type, const void * addr, unsigned long size)
132 {
133 return access_ok(type, addr, size) ? 0 : -EFAULT;
134 }
135
136 /*
137 * put_user: - Write a simple value into user space.
138 * @x: Value to copy to user space.
139 * @ptr: Destination address, in user space.
140 *
141 * Context: User context only. This function may sleep.
142 *
143 * This macro copies a single simple value from kernel space to user
144 * space. It supports simple types like char and int, but not larger
145 * data types like structures or arrays.
146 *
147 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
148 * to the result of dereferencing @ptr.
149 *
150 * Returns zero on success, or -EFAULT on error.
151 */
152 #define put_user(x,ptr) \
153 __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
154
155 /*
156 * get_user: - Get a simple variable from user space.
157 * @x: Variable to store result.
158 * @ptr: Source address, in user space.
159 *
160 * Context: User context only. This function may sleep.
161 *
162 * This macro copies a single simple variable from user space to kernel
163 * space. It supports simple types like char and int, but not larger
164 * data types like structures or arrays.
165 *
166 * @ptr must have pointer-to-simple-variable type, and the result of
167 * dereferencing @ptr must be assignable to @x without a cast.
168 *
169 * Returns zero on success, or -EFAULT on error.
170 * On error, the variable @x is set to zero.
171 */
172 #define get_user(x,ptr) \
173 __get_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
174
175 /*
176 * __put_user: - Write a simple value into user space, with less checking.
177 * @x: Value to copy to user space.
178 * @ptr: Destination address, in user space.
179 *
180 * Context: User context only. This function may sleep.
181 *
182 * This macro copies a single simple value from kernel space to user
183 * space. It supports simple types like char and int, but not larger
184 * data types like structures or arrays.
185 *
186 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
187 * to the result of dereferencing @ptr.
188 *
189 * Caller must check the pointer with access_ok() before calling this
190 * function.
191 *
192 * Returns zero on success, or -EFAULT on error.
193 */
194 #define __put_user(x,ptr) \
195 __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
196
197 /*
198 * __get_user: - Get a simple variable from user space, with less checking.
199 * @x: Variable to store result.
200 * @ptr: Source address, in user space.
201 *
202 * Context: User context only. This function may sleep.
203 *
204 * This macro copies a single simple variable from user space to kernel
205 * space. It supports simple types like char and int, but not larger
206 * data types like structures or arrays.
207 *
208 * @ptr must have pointer-to-simple-variable type, and the result of
209 * dereferencing @ptr must be assignable to @x without a cast.
210 *
211 * Caller must check the pointer with access_ok() before calling this
212 * function.
213 *
214 * Returns zero on success, or -EFAULT on error.
215 * On error, the variable @x is set to zero.
216 */
217 #define __get_user(x,ptr) \
218 __get_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
219
220 struct __large_struct { unsigned long buf[100]; };
221 #define __m(x) (*(struct __large_struct *)(x))
222
223 /*
224 * Yuck. We need two variants, one for 64bit operation and one
225 * for 32 bit mode and old iron.
226 */
227 #ifdef __mips64
228 #define __GET_USER_DW __get_user_asm("ld")
229 #else
230 #define __GET_USER_DW __get_user_asm_ll32
231 #endif
232
233 #define __get_user_nocheck(x,ptr,size) \
234 ({ \
235 long __gu_err; \
236 __typeof(*(ptr)) __gu_val; \
237 long __gu_addr; \
238 might_sleep(); \
239 __asm__("":"=r" (__gu_val)); \
240 __gu_addr = (long) (ptr); \
241 __asm__("":"=r" (__gu_err)); \
242 switch (size) { \
243 case 1: __get_user_asm("lb"); break; \
244 case 2: __get_user_asm("lh"); break; \
245 case 4: __get_user_asm("lw"); break; \
246 case 8: __GET_USER_DW; break; \
247 default: __get_user_unknown(); break; \
248 } x = (__typeof__(*(ptr))) __gu_val; __gu_err; \
249 })
250
251 #define __get_user_check(x,ptr,size) \
252 ({ \
253 long __gu_err; \
254 __typeof__(*(ptr)) __gu_val; \
255 long __gu_addr; \
256 might_sleep(); \
257 __asm__("":"=r" (__gu_val)); \
258 __gu_addr = (long) (ptr); \
259 __asm__("":"=r" (__gu_err)); \
260 if (access_ok(VERIFY_READ,__gu_addr,size)) { \
261 switch (size) { \
262 case 1: __get_user_asm("lb"); break; \
263 case 2: __get_user_asm("lh"); break; \
264 case 4: __get_user_asm("lw"); break; \
265 case 8: __GET_USER_DW; break; \
266 default: __get_user_unknown(); break; \
267 } \
268 } x = (__typeof__(*(ptr))) __gu_val; __gu_err; \
269 })
270
271 #define __get_user_asm(insn) \
272 ({ \
273 __asm__ __volatile__( \
274 "1:\t" insn "\t%1,%2\n\t" \
275 "move\t%0,$0\n" \
276 "2:\n\t" \
277 ".section\t.fixup,\"ax\"\n" \
278 "3:\tli\t%0,%3\n\t" \
279 "move\t%1,$0\n\t" \
280 "j\t2b\n\t" \
281 ".previous\n\t" \
282 ".section\t__ex_table,\"a\"\n\t" \
283 __UA_ADDR "\t1b,3b\n\t" \
284 ".previous" \
285 :"=r" (__gu_err), "=r" (__gu_val) \
286 :"o" (__m(__gu_addr)), "i" (-EFAULT)); \
287 })
288
289 /*
290 * Get a long long 64 using 32 bit registers.
291 */
292 #define __get_user_asm_ll32 \
293 ({ \
294 __asm__ __volatile__( \
295 "1:\tlw\t%1,%2\n" \
296 "2:\tlw\t%D1,%3\n\t" \
297 "move\t%0,$0\n" \
298 "3:\t.section\t.fixup,\"ax\"\n" \
299 "4:\tli\t%0,%4\n\t" \
300 "move\t%1,$0\n\t" \
301 "move\t%D1,$0\n\t" \
302 "j\t3b\n\t" \
303 ".previous\n\t" \
304 ".section\t__ex_table,\"a\"\n\t" \
305 __UA_ADDR "\t1b,4b\n\t" \
306 __UA_ADDR "\t2b,4b\n\t" \
307 ".previous" \
308 :"=r" (__gu_err), "=&r" (__gu_val) \
309 :"o" (__m(__gu_addr)), "o" (__m(__gu_addr + 4)), \
310 "i" (-EFAULT)); \
311 })
312
313 extern void __get_user_unknown(void);
314
315 /*
316 * Yuck. We need two variants, one for 64bit operation and one
317 * for 32 bit mode and old iron.
318 */
319 #ifdef __mips64
320 #define __PUT_USER_DW __put_user_asm("sd")
321 #else
322 #define __PUT_USER_DW __put_user_asm_ll32
323 #endif
324
325 #define __put_user_nocheck(x,ptr,size) \
326 ({ \
327 long __pu_err; \
328 __typeof__(*(ptr)) __pu_val; \
329 long __pu_addr; \
330 might_sleep(); \
331 __pu_val = (x); \
332 __pu_addr = (long) (ptr); \
333 __asm__("":"=r" (__pu_err)); \
334 switch (size) { \
335 case 1: __put_user_asm("sb"); break; \
336 case 2: __put_user_asm("sh"); break; \
337 case 4: __put_user_asm("sw"); break; \
338 case 8: __PUT_USER_DW; break; \
339 default: __put_user_unknown(); break; \
340 } \
341 __pu_err; \
342 })
343
344 #define __put_user_check(x,ptr,size) \
345 ({ \
346 long __pu_err; \
347 __typeof__(*(ptr)) __pu_val; \
348 long __pu_addr; \
349 might_sleep(); \
350 __pu_val = (x); \
351 __pu_addr = (long) (ptr); \
352 __asm__("":"=r" (__pu_err)); \
353 if (access_ok(VERIFY_WRITE, __pu_addr, size)) { \
354 switch (size) { \
355 case 1: __put_user_asm("sb"); break; \
356 case 2: __put_user_asm("sh"); break; \
357 case 4: __put_user_asm("sw"); break; \
358 case 8: __PUT_USER_DW; break; \
359 default: __put_user_unknown(); break; \
360 } \
361 } \
362 __pu_err; \
363 })
364
365 #define __put_user_asm(insn) \
366 ({ \
367 __asm__ __volatile__( \
368 "1:\t" insn "\t%z1, %2\t\t\t# __put_user_asm\n\t" \
369 "move\t%0, $0\n" \
370 "2:\n\t" \
371 ".section\t.fixup,\"ax\"\n" \
372 "3:\tli\t%0,%3\n\t" \
373 "j\t2b\n\t" \
374 ".previous\n\t" \
375 ".section\t__ex_table,\"a\"\n\t" \
376 __UA_ADDR "\t1b,3b\n\t" \
377 ".previous" \
378 :"=r" (__pu_err) \
379 :"Jr" (__pu_val), "o" (__m(__pu_addr)), "i" (-EFAULT)); \
380 })
381
382 #define __put_user_asm_ll32 \
383 ({ \
384 __asm__ __volatile__( \
385 "1:\tsw\t%1, %2\t\t\t# __put_user_asm_ll32\n\t" \
386 "2:\tsw\t%D1, %3\n" \
387 "move\t%0, $0\n" \
388 "3:\n\t" \
389 ".section\t.fixup,\"ax\"\n" \
390 "4:\tli\t%0,%4\n\t" \
391 "j\t3b\n\t" \
392 ".previous\n\t" \
393 ".section\t__ex_table,\"a\"\n\t" \
394 __UA_ADDR "\t1b,4b\n\t" \
395 __UA_ADDR "\t2b,4b\n\t" \
396 ".previous" \
397 :"=r" (__pu_err) \
398 :"r" (__pu_val), "o" (__m(__pu_addr)), \
399 "o" (__m(__pu_addr + 4)), "i" (-EFAULT)); \
400 })
401
402 extern void __put_user_unknown(void);
403
404 /*
405 * We're generating jump to subroutines which will be outside the range of
406 * jump instructions
407 */
408 #ifdef MODULE
409 #define __MODULE_JAL(destination) \
410 ".set\tnoat\n\t" \
411 __UA_LA "\t$1, " #destination "\n\t" \
412 "jalr\t$1\n\t" \
413 ".set\tat\n\t"
414 #else
415 #define __MODULE_JAL(destination) \
416 "jal\t" #destination "\n\t"
417 #endif
418
419 extern size_t __copy_user(void *__to, const void *__from, size_t __n);
420
421 #define __invoke_copy_to_user(to,from,n) \
422 ({ \
423 register void *__cu_to_r __asm__ ("$4"); \
424 register const void *__cu_from_r __asm__ ("$5"); \
425 register long __cu_len_r __asm__ ("$6"); \
426 \
427 __cu_to_r = (to); \
428 __cu_from_r = (from); \
429 __cu_len_r = (n); \
430 __asm__ __volatile__( \
431 __MODULE_JAL(__copy_user) \
432 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
433 : \
434 : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
435 "memory"); \
436 __cu_len_r; \
437 })
438
439 /*
440 * __copy_to_user: - Copy a block of data into user space, with less checking.
441 * @to: Destination address, in user space.
442 * @from: Source address, in kernel space.
443 * @n: Number of bytes to copy.
444 *
445 * Context: User context only. This function may sleep.
446 *
447 * Copy data from kernel space to user space. Caller must check
448 * the specified block with access_ok() before calling this function.
449 *
450 * Returns number of bytes that could not be copied.
451 * On success, this will be zero.
452 */
453 #define __copy_to_user(to,from,n) \
454 ({ \
455 void *__cu_to; \
456 const void *__cu_from; \
457 long __cu_len; \
458 \
459 might_sleep(); \
460 __cu_to = (to); \
461 __cu_from = (from); \
462 __cu_len = (n); \
463 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
464 __cu_len; \
465 })
466
467 #define __copy_to_user_inatomic __copy_to_user
468 #define __copy_from_user_inatomic __copy_from_user
469
470 /*
471 * copy_to_user: - Copy a block of data into user space.
472 * @to: Destination address, in user space.
473 * @from: Source address, in kernel space.
474 * @n: Number of bytes to copy.
475 *
476 * Context: User context only. This function may sleep.
477 *
478 * Copy data from kernel space to user space.
479 *
480 * Returns number of bytes that could not be copied.
481 * On success, this will be zero.
482 */
483 #define copy_to_user(to,from,n) \
484 ({ \
485 void *__cu_to; \
486 const void *__cu_from; \
487 long __cu_len; \
488 \
489 might_sleep(); \
490 __cu_to = (to); \
491 __cu_from = (from); \
492 __cu_len = (n); \
493 if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) \
494 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
495 __cu_len); \
496 __cu_len; \
497 })
498
499 #define __invoke_copy_from_user(to,from,n) \
500 ({ \
501 register void *__cu_to_r __asm__ ("$4"); \
502 register const void *__cu_from_r __asm__ ("$5"); \
503 register long __cu_len_r __asm__ ("$6"); \
504 \
505 __cu_to_r = (to); \
506 __cu_from_r = (from); \
507 __cu_len_r = (n); \
508 __asm__ __volatile__( \
509 ".set\tnoreorder\n\t" \
510 __MODULE_JAL(__copy_user) \
511 ".set\tnoat\n\t" \
512 __UA_ADDU "\t$1, %1, %2\n\t" \
513 ".set\tat\n\t" \
514 ".set\treorder\n\t" \
515 "move\t%0, $6" /* XXX */ \
516 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
517 : \
518 : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
519 "memory"); \
520 __cu_len_r; \
521 })
522
523 /*
524 * __copy_from_user: - Copy a block of data from user space, with less checking. * @to: Destination address, in kernel space.
525 * @from: Source address, in user space.
526 * @n: Number of bytes to copy.
527 *
528 * Context: User context only. This function may sleep.
529 *
530 * Copy data from user space to kernel space. Caller must check
531 * the specified block with access_ok() before calling this function.
532 *
533 * Returns number of bytes that could not be copied.
534 * On success, this will be zero.
535 *
536 * If some data could not be copied, this function will pad the copied
537 * data to the requested size using zero bytes.
538 */
539 #define __copy_from_user(to,from,n) \
540 ({ \
541 void *__cu_to; \
542 const void *__cu_from; \
543 long __cu_len; \
544 \
545 might_sleep(); \
546 __cu_to = (to); \
547 __cu_from = (from); \
548 __cu_len = (n); \
549 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
550 __cu_len); \
551 __cu_len; \
552 })
553
554 /*
555 * copy_from_user: - Copy a block of data from user space.
556 * @to: Destination address, in kernel space.
557 * @from: Source address, in user space.
558 * @n: Number of bytes to copy.
559 *
560 * Context: User context only. This function may sleep.
561 *
562 * Copy data from user space to kernel space.
563 *
564 * Returns number of bytes that could not be copied.
565 * On success, this will be zero.
566 *
567 * If some data could not be copied, this function will pad the copied
568 * data to the requested size using zero bytes.
569 */
570 #define copy_from_user(to,from,n) \
571 ({ \
572 void *__cu_to; \
573 const void *__cu_from; \
574 long __cu_len; \
575 \
576 might_sleep(); \
577 __cu_to = (to); \
578 __cu_from = (from); \
579 __cu_len = (n); \
580 if (access_ok(VERIFY_READ, __cu_from, __cu_len)) \
581 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
582 __cu_len); \
583 __cu_len; \
584 })
585
586 #define __copy_in_user(to, from, n) __copy_from_user(to, from, n)
587
588 #define copy_in_user(to,from,n) \
589 ({ \
590 void *__cu_to; \
591 const void *__cu_from; \
592 long __cu_len; \
593 \
594 might_sleep(); \
595 __cu_to = (to); \
596 __cu_from = (from); \
597 __cu_len = (n); \
598 if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) && \
599 access_ok(VERIFY_WRITE, __cu_to, __cu_len))) \
600 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
601 __cu_len); \
602 __cu_len; \
603 })
604
605 /*
606 * __clear_user: - Zero a block of memory in user space, with less checking.
607 * @to: Destination address, in user space.
608 * @n: Number of bytes to zero.
609 *
610 * Zero a block of memory in user space. Caller must check
611 * the specified block with access_ok() before calling this function.
612 *
613 * Returns number of bytes that could not be cleared.
614 * On success, this will be zero.
615 */
616 static inline __kernel_size_t
617 __clear_user(void *addr, __kernel_size_t size)
618 {
619 __kernel_size_t res;
620
621 might_sleep();
622 __asm__ __volatile__(
623 "move\t$4, %1\n\t"
624 "move\t$5, $0\n\t"
625 "move\t$6, %2\n\t"
626 __MODULE_JAL(__bzero)
627 "move\t%0, $6"
628 : "=r" (res)
629 : "r" (addr), "r" (size)
630 : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
631
632 return res;
633 }
634
635 #define clear_user(addr,n) \
636 ({ \
637 void * __cl_addr = (addr); \
638 unsigned long __cl_size = (n); \
639 if (__cl_size && access_ok(VERIFY_WRITE, \
640 ((unsigned long)(__cl_addr)), __cl_size)) \
641 __cl_size = __clear_user(__cl_addr, __cl_size); \
642 __cl_size; \
643 })
644
645 /*
646 * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
647 * @dst: Destination address, in kernel space. This buffer must be at
648 * least @count bytes long.
649 * @src: Source address, in user space.
650 * @count: Maximum number of bytes to copy, including the trailing NUL.
651 *
652 * Copies a NUL-terminated string from userspace to kernel space.
653 * Caller must check the specified block with access_ok() before calling
654 * this function.
655 *
656 * On success, returns the length of the string (not including the trailing
657 * NUL).
658 *
659 * If access to userspace fails, returns -EFAULT (some data may have been
660 * copied).
661 *
662 * If @count is smaller than the length of the string, copies @count bytes
663 * and returns @count.
664 */
665 static inline long
666 __strncpy_from_user(char *__to, const char *__from, long __len)
667 {
668 long res;
669
670 might_sleep();
671 __asm__ __volatile__(
672 "move\t$4, %1\n\t"
673 "move\t$5, %2\n\t"
674 "move\t$6, %3\n\t"
675 __MODULE_JAL(__strncpy_from_user_nocheck_asm)
676 "move\t%0, $2"
677 : "=r" (res)
678 : "r" (__to), "r" (__from), "r" (__len)
679 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
680
681 return res;
682 }
683
684 /*
685 * strncpy_from_user: - Copy a NUL terminated string from userspace.
686 * @dst: Destination address, in kernel space. This buffer must be at
687 * least @count bytes long.
688 * @src: Source address, in user space.
689 * @count: Maximum number of bytes to copy, including the trailing NUL.
690 *
691 * Copies a NUL-terminated string from userspace to kernel space.
692 *
693 * On success, returns the length of the string (not including the trailing
694 * NUL).
695 *
696 * If access to userspace fails, returns -EFAULT (some data may have been
697 * copied).
698 *
699 * If @count is smaller than the length of the string, copies @count bytes
700 * and returns @count.
701 */
702 static inline long
703 strncpy_from_user(char *__to, const char *__from, long __len)
704 {
705 long res;
706
707 might_sleep();
708 __asm__ __volatile__(
709 "move\t$4, %1\n\t"
710 "move\t$5, %2\n\t"
711 "move\t$6, %3\n\t"
712 __MODULE_JAL(__strncpy_from_user_asm)
713 "move\t%0, $2"
714 : "=r" (res)
715 : "r" (__to), "r" (__from), "r" (__len)
716 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
717
718 return res;
719 }
720
721 /* Returns: 0 if bad, string length+1 (memory size) of string if ok */
722 static inline long __strlen_user(const char *s)
723 {
724 long res;
725
726 might_sleep();
727 __asm__ __volatile__(
728 "move\t$4, %1\n\t"
729 __MODULE_JAL(__strlen_user_nocheck_asm)
730 "move\t%0, $2"
731 : "=r" (res)
732 : "r" (s)
733 : "$2", "$4", __UA_t0, "$31");
734
735 return res;
736 }
737
738 /*
739 * strlen_user: - Get the size of a string in user space.
740 * @str: The string to measure.
741 *
742 * Context: User context only. This function may sleep.
743 *
744 * Get the size of a NUL-terminated string in user space.
745 *
746 * Returns the size of the string INCLUDING the terminating NUL.
747 * On exception, returns 0.
748 *
749 * If there is a limit on the length of a valid string, you may wish to
750 * consider using strnlen_user() instead.
751 */
752 static inline long strlen_user(const char *s)
753 {
754 long res;
755
756 might_sleep();
757 __asm__ __volatile__(
758 "move\t$4, %1\n\t"
759 __MODULE_JAL(__strlen_user_asm)
760 "move\t%0, $2"
761 : "=r" (res)
762 : "r" (s)
763 : "$2", "$4", __UA_t0, "$31");
764
765 return res;
766 }
767
768 /* Returns: 0 if bad, string length+1 (memory size) of string if ok */
769 static inline long __strnlen_user(const char *s, long n)
770 {
771 long res;
772
773 might_sleep();
774 __asm__ __volatile__(
775 "move\t$4, %1\n\t"
776 "move\t$5, %2\n\t"
777 __MODULE_JAL(__strnlen_user_nocheck_asm)
778 "move\t%0, $2"
779 : "=r" (res)
780 : "r" (s), "r" (n)
781 : "$2", "$4", "$5", __UA_t0, "$31");
782
783 return res;
784 }
785
786 /*
787 * strlen_user: - Get the size of a string in user space.
788 * @str: The string to measure.
789 *
790 * Context: User context only. This function may sleep.
791 *
792 * Get the size of a NUL-terminated string in user space.
793 *
794 * Returns the size of the string INCLUDING the terminating NUL.
795 * On exception, returns 0.
796 *
797 * If there is a limit on the length of a valid string, you may wish to
798 * consider using strnlen_user() instead.
799 */
800 static inline long strnlen_user(const char *s, long n)
801 {
802 long res;
803
804 might_sleep();
805 __asm__ __volatile__(
806 "move\t$4, %1\n\t"
807 "move\t$5, %2\n\t"
808 __MODULE_JAL(__strnlen_user_asm)
809 "move\t%0, $2"
810 : "=r" (res)
811 : "r" (s), "r" (n)
812 : "$2", "$4", "$5", __UA_t0, "$31");
813
814 return res;
815 }
816
817 struct exception_table_entry
818 {
819 unsigned long insn;
820 unsigned long nextinsn;
821 };
822
823 extern int fixup_exception(struct pt_regs *regs);
824
825 #endif /* _ASM_UACCESS_H */
MOXA 2.6.9 from sdlinux-moxaart.tgz