projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge remote-tracking branch 'spi/topic/core' into spi-next
[deliverable/linux.git] / arch / mips / include / asm / uaccess.h
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 * Copyright (C) 2007 Maciej W. Rozycki
9 * Copyright (C) 2014, Imagination Technologies Ltd.
10 */
11 #ifndef _ASM_UACCESS_H
12 #define _ASM_UACCESS_H
13
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/thread_info.h>
17 #include <asm/asm-eva.h>
18
19 /*
20 * The fs value determines whether argument validity checking should be
21 * performed or not. If get_fs() == USER_DS, checking is performed, with
22 * get_fs() == KERNEL_DS, checking is bypassed.
23 *
24 * For historical reasons, these macros are grossly misnamed.
25 */
26 #ifdef CONFIG_32BIT
27
28 #ifdef CONFIG_KVM_GUEST
29 #define __UA_LIMIT 0x40000000UL
30 #else
31 #define __UA_LIMIT 0x80000000UL
32 #endif
33
34 #define __UA_ADDR ".word"
35 #define __UA_LA "la"
36 #define __UA_ADDU "addu"
37 #define __UA_t0 "$8"
38 #define __UA_t1 "$9"
39
40 #endif /* CONFIG_32BIT */
41
42 #ifdef CONFIG_64BIT
43
44 extern u64 __ua_limit;
45
46 #define __UA_LIMIT __ua_limit
47
48 #define __UA_ADDR ".dword"
49 #define __UA_LA "dla"
50 #define __UA_ADDU "daddu"
51 #define __UA_t0 "$12"
52 #define __UA_t1 "$13"
53
54 #endif /* CONFIG_64BIT */
55
56 /*
57 * USER_DS is a bitmask that has the bits set that may not be set in a valid
58 * userspace address. Note that we limit 32-bit userspace to 0x7fff8000 but
59 * the arithmetic we're doing only works if the limit is a power of two, so
60 * we use 0x80000000 here on 32-bit kernels. If a process passes an invalid
61 * address in this range it's the process's problem, not ours :-)
62 */
63
64 #ifdef CONFIG_KVM_GUEST
65 #define KERNEL_DS ((mm_segment_t) { 0x80000000UL })
66 #define USER_DS ((mm_segment_t) { 0xC0000000UL })
67 #else
68 #define KERNEL_DS ((mm_segment_t) { 0UL })
69 #define USER_DS ((mm_segment_t) { __UA_LIMIT })
70 #endif
71
72 #define VERIFY_READ 0
73 #define VERIFY_WRITE 1
74
75 #define get_ds() (KERNEL_DS)
76 #define get_fs() (current_thread_info()->addr_limit)
77 #define set_fs(x) (current_thread_info()->addr_limit = (x))
78
79 #define segment_eq(a, b) ((a).seg == (b).seg)
80
81
82 /*
83 * Is a address valid? This does a straighforward calculation rather
84 * than tests.
85 *
86 * Address valid if:
87 * - "addr" doesn't have any high-bits set
88 * - AND "size" doesn't have any high-bits set
89 * - AND "addr+size" doesn't have any high-bits set
90 * - OR we are in kernel mode.
91 *
92 * __ua_size() is a trick to avoid runtime checking of positive constant
93 * sizes; for those we already know at compile time that the size is ok.
94 */
95 #define __ua_size(size) \
96 ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
97
98 /*
99 * access_ok: - Checks if a user space pointer is valid
100 * @type: Type of access: %VERIFY_READ or %VERIFY_WRITE. Note that
101 * %VERIFY_WRITE is a superset of %VERIFY_READ - if it is safe
102 * to write to a block, it is always safe to read from it.
103 * @addr: User space pointer to start of block to check
104 * @size: Size of block to check
105 *
106 * Context: User context only. This function may sleep.
107 *
108 * Checks if a pointer to a block of memory in user space is valid.
109 *
110 * Returns true (nonzero) if the memory block may be valid, false (zero)
111 * if it is definitely invalid.
112 *
113 * Note that, depending on architecture, this function probably just
114 * checks that the pointer is in the user space range - after calling
115 * this function, memory access functions may still return -EFAULT.
116 */
117
118 #define __access_mask get_fs().seg
119
120 #define __access_ok(addr, size, mask) \
121 ({ \
122 unsigned long __addr = (unsigned long) (addr); \
123 unsigned long __size = size; \
124 unsigned long __mask = mask; \
125 unsigned long __ok; \
126 \
127 __chk_user_ptr(addr); \
128 __ok = (signed long)(__mask & (__addr | (__addr + __size) | \
129 __ua_size(__size))); \
130 __ok == 0; \
131 })
132
133 #define access_ok(type, addr, size) \
134 likely(__access_ok((addr), (size), __access_mask))
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((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((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((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((x), (ptr), sizeof(*(ptr)))
219
220 struct __large_struct { unsigned long buf[100]; };
221 #define __m(x) (*(struct __large_struct __user *)(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 #ifndef CONFIG_EVA
228 #define __get_kernel_common(val, size, ptr) __get_user_common(val, size, ptr)
229 #else
230 /*
231 * Kernel specific functions for EVA. We need to use normal load instructions
232 * to read data from kernel when operating in EVA mode. We use these macros to
233 * avoid redefining __get_user_asm for EVA.
234 */
235 #undef _loadd
236 #undef _loadw
237 #undef _loadh
238 #undef _loadb
239 #ifdef CONFIG_32BIT
240 #define _loadd _loadw
241 #else
242 #define _loadd(reg, addr) "ld " reg ", " addr
243 #endif
244 #define _loadw(reg, addr) "lw " reg ", " addr
245 #define _loadh(reg, addr) "lh " reg ", " addr
246 #define _loadb(reg, addr) "lb " reg ", " addr
247
248 #define __get_kernel_common(val, size, ptr) \
249 do { \
250 switch (size) { \
251 case 1: __get_data_asm(val, _loadb, ptr); break; \
252 case 2: __get_data_asm(val, _loadh, ptr); break; \
253 case 4: __get_data_asm(val, _loadw, ptr); break; \
254 case 8: __GET_DW(val, _loadd, ptr); break; \
255 default: __get_user_unknown(); break; \
256 } \
257 } while (0)
258 #endif
259
260 #ifdef CONFIG_32BIT
261 #define __GET_DW(val, insn, ptr) __get_data_asm_ll32(val, insn, ptr)
262 #endif
263 #ifdef CONFIG_64BIT
264 #define __GET_DW(val, insn, ptr) __get_data_asm(val, insn, ptr)
265 #endif
266
267 extern void __get_user_unknown(void);
268
269 #define __get_user_common(val, size, ptr) \
270 do { \
271 switch (size) { \
272 case 1: __get_data_asm(val, user_lb, ptr); break; \
273 case 2: __get_data_asm(val, user_lh, ptr); break; \
274 case 4: __get_data_asm(val, user_lw, ptr); break; \
275 case 8: __GET_DW(val, user_ld, ptr); break; \
276 default: __get_user_unknown(); break; \
277 } \
278 } while (0)
279
280 #define __get_user_nocheck(x, ptr, size) \
281 ({ \
282 int __gu_err; \
283 \
284 if (segment_eq(get_fs(), get_ds())) { \
285 __get_kernel_common((x), size, ptr); \
286 } else { \
287 __chk_user_ptr(ptr); \
288 __get_user_common((x), size, ptr); \
289 } \
290 __gu_err; \
291 })
292
293 #define __get_user_check(x, ptr, size) \
294 ({ \
295 int __gu_err = -EFAULT; \
296 const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
297 \
298 might_fault(); \
299 if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) { \
300 if (segment_eq(get_fs(), get_ds())) \
301 __get_kernel_common((x), size, __gu_ptr); \
302 else \
303 __get_user_common((x), size, __gu_ptr); \
304 } else \
305 (x) = 0; \
306 \
307 __gu_err; \
308 })
309
310 #define __get_data_asm(val, insn, addr) \
311 { \
312 long __gu_tmp; \
313 \
314 __asm__ __volatile__( \
315 "1: "insn("%1", "%3")" \n" \
316 "2: \n" \
317 " .insn \n" \
318 " .section .fixup,\"ax\" \n" \
319 "3: li %0, %4 \n" \
320 " move %1, $0 \n" \
321 " j 2b \n" \
322 " .previous \n" \
323 " .section __ex_table,\"a\" \n" \
324 " "__UA_ADDR "\t1b, 3b \n" \
325 " .previous \n" \
326 : "=r" (__gu_err), "=r" (__gu_tmp) \
327 : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
328 \
329 (val) = (__typeof__(*(addr))) __gu_tmp; \
330 }
331
332 /*
333 * Get a long long 64 using 32 bit registers.
334 */
335 #define __get_data_asm_ll32(val, insn, addr) \
336 { \
337 union { \
338 unsigned long long l; \
339 __typeof__(*(addr)) t; \
340 } __gu_tmp; \
341 \
342 __asm__ __volatile__( \
343 "1: " insn("%1", "(%3)")" \n" \
344 "2: " insn("%D1", "4(%3)")" \n" \
345 "3: \n" \
346 " .insn \n" \
347 " .section .fixup,\"ax\" \n" \
348 "4: li %0, %4 \n" \
349 " move %1, $0 \n" \
350 " move %D1, $0 \n" \
351 " j 3b \n" \
352 " .previous \n" \
353 " .section __ex_table,\"a\" \n" \
354 " " __UA_ADDR " 1b, 4b \n" \
355 " " __UA_ADDR " 2b, 4b \n" \
356 " .previous \n" \
357 : "=r" (__gu_err), "=&r" (__gu_tmp.l) \
358 : "0" (0), "r" (addr), "i" (-EFAULT)); \
359 \
360 (val) = __gu_tmp.t; \
361 }
362
363 #ifndef CONFIG_EVA
364 #define __put_kernel_common(ptr, size) __put_user_common(ptr, size)
365 #else
366 /*
367 * Kernel specific functions for EVA. We need to use normal load instructions
368 * to read data from kernel when operating in EVA mode. We use these macros to
369 * avoid redefining __get_data_asm for EVA.
370 */
371 #undef _stored
372 #undef _storew
373 #undef _storeh
374 #undef _storeb
375 #ifdef CONFIG_32BIT
376 #define _stored _storew
377 #else
378 #define _stored(reg, addr) "ld " reg ", " addr
379 #endif
380
381 #define _storew(reg, addr) "sw " reg ", " addr
382 #define _storeh(reg, addr) "sh " reg ", " addr
383 #define _storeb(reg, addr) "sb " reg ", " addr
384
385 #define __put_kernel_common(ptr, size) \
386 do { \
387 switch (size) { \
388 case 1: __put_data_asm(_storeb, ptr); break; \
389 case 2: __put_data_asm(_storeh, ptr); break; \
390 case 4: __put_data_asm(_storew, ptr); break; \
391 case 8: __PUT_DW(_stored, ptr); break; \
392 default: __put_user_unknown(); break; \
393 } \
394 } while(0)
395 #endif
396
397 /*
398 * Yuck. We need two variants, one for 64bit operation and one
399 * for 32 bit mode and old iron.
400 */
401 #ifdef CONFIG_32BIT
402 #define __PUT_DW(insn, ptr) __put_data_asm_ll32(insn, ptr)
403 #endif
404 #ifdef CONFIG_64BIT
405 #define __PUT_DW(insn, ptr) __put_data_asm(insn, ptr)
406 #endif
407
408 #define __put_user_common(ptr, size) \
409 do { \
410 switch (size) { \
411 case 1: __put_data_asm(user_sb, ptr); break; \
412 case 2: __put_data_asm(user_sh, ptr); break; \
413 case 4: __put_data_asm(user_sw, ptr); break; \
414 case 8: __PUT_DW(user_sd, ptr); break; \
415 default: __put_user_unknown(); break; \
416 } \
417 } while (0)
418
419 #define __put_user_nocheck(x, ptr, size) \
420 ({ \
421 __typeof__(*(ptr)) __pu_val; \
422 int __pu_err = 0; \
423 \
424 __pu_val = (x); \
425 if (segment_eq(get_fs(), get_ds())) { \
426 __put_kernel_common(ptr, size); \
427 } else { \
428 __chk_user_ptr(ptr); \
429 __put_user_common(ptr, size); \
430 } \
431 __pu_err; \
432 })
433
434 #define __put_user_check(x, ptr, size) \
435 ({ \
436 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
437 __typeof__(*(ptr)) __pu_val = (x); \
438 int __pu_err = -EFAULT; \
439 \
440 might_fault(); \
441 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
442 if (segment_eq(get_fs(), get_ds())) \
443 __put_kernel_common(__pu_addr, size); \
444 else \
445 __put_user_common(__pu_addr, size); \
446 } \
447 \
448 __pu_err; \
449 })
450
451 #define __put_data_asm(insn, ptr) \
452 { \
453 __asm__ __volatile__( \
454 "1: "insn("%z2", "%3")" # __put_data_asm \n" \
455 "2: \n" \
456 " .insn \n" \
457 " .section .fixup,\"ax\" \n" \
458 "3: li %0, %4 \n" \
459 " j 2b \n" \
460 " .previous \n" \
461 " .section __ex_table,\"a\" \n" \
462 " " __UA_ADDR " 1b, 3b \n" \
463 " .previous \n" \
464 : "=r" (__pu_err) \
465 : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
466 "i" (-EFAULT)); \
467 }
468
469 #define __put_data_asm_ll32(insn, ptr) \
470 { \
471 __asm__ __volatile__( \
472 "1: "insn("%2", "(%3)")" # __put_data_asm_ll32 \n" \
473 "2: "insn("%D2", "4(%3)")" \n" \
474 "3: \n" \
475 " .insn \n" \
476 " .section .fixup,\"ax\" \n" \
477 "4: li %0, %4 \n" \
478 " j 3b \n" \
479 " .previous \n" \
480 " .section __ex_table,\"a\" \n" \
481 " " __UA_ADDR " 1b, 4b \n" \
482 " " __UA_ADDR " 2b, 4b \n" \
483 " .previous" \
484 : "=r" (__pu_err) \
485 : "0" (0), "r" (__pu_val), "r" (ptr), \
486 "i" (-EFAULT)); \
487 }
488
489 extern void __put_user_unknown(void);
490
491 /*
492 * ul{b,h,w} are macros and there are no equivalent macros for EVA.
493 * EVA unaligned access is handled in the ADE exception handler.
494 */
495 #ifndef CONFIG_EVA
496 /*
497 * put_user_unaligned: - Write a simple value into user space.
498 * @x: Value to copy to user space.
499 * @ptr: Destination address, in user space.
500 *
501 * Context: User context only. This function may sleep.
502 *
503 * This macro copies a single simple value from kernel space to user
504 * space. It supports simple types like char and int, but not larger
505 * data types like structures or arrays.
506 *
507 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
508 * to the result of dereferencing @ptr.
509 *
510 * Returns zero on success, or -EFAULT on error.
511 */
512 #define put_user_unaligned(x,ptr) \
513 __put_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
514
515 /*
516 * get_user_unaligned: - Get a simple variable from user space.
517 * @x: Variable to store result.
518 * @ptr: Source address, in user space.
519 *
520 * Context: User context only. This function may sleep.
521 *
522 * This macro copies a single simple variable from user space to kernel
523 * space. It supports simple types like char and int, but not larger
524 * data types like structures or arrays.
525 *
526 * @ptr must have pointer-to-simple-variable type, and the result of
527 * dereferencing @ptr must be assignable to @x without a cast.
528 *
529 * Returns zero on success, or -EFAULT on error.
530 * On error, the variable @x is set to zero.
531 */
532 #define get_user_unaligned(x,ptr) \
533 __get_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
534
535 /*
536 * __put_user_unaligned: - Write a simple value into user space, with less checking.
537 * @x: Value to copy to user space.
538 * @ptr: Destination address, in user space.
539 *
540 * Context: User context only. This function may sleep.
541 *
542 * This macro copies a single simple value from kernel space to user
543 * space. It supports simple types like char and int, but not larger
544 * data types like structures or arrays.
545 *
546 * @ptr must have pointer-to-simple-variable type, and @x must be assignable
547 * to the result of dereferencing @ptr.
548 *
549 * Caller must check the pointer with access_ok() before calling this
550 * function.
551 *
552 * Returns zero on success, or -EFAULT on error.
553 */
554 #define __put_user_unaligned(x,ptr) \
555 __put_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr)))
556
557 /*
558 * __get_user_unaligned: - Get a simple variable from user space, with less checking.
559 * @x: Variable to store result.
560 * @ptr: Source address, in user space.
561 *
562 * Context: User context only. This function may sleep.
563 *
564 * This macro copies a single simple variable from user space to kernel
565 * space. It supports simple types like char and int, but not larger
566 * data types like structures or arrays.
567 *
568 * @ptr must have pointer-to-simple-variable type, and the result of
569 * dereferencing @ptr must be assignable to @x without a cast.
570 *
571 * Caller must check the pointer with access_ok() before calling this
572 * function.
573 *
574 * Returns zero on success, or -EFAULT on error.
575 * On error, the variable @x is set to zero.
576 */
577 #define __get_user_unaligned(x,ptr) \
578 __get_user__unalignednocheck((x),(ptr),sizeof(*(ptr)))
579
580 /*
581 * Yuck. We need two variants, one for 64bit operation and one
582 * for 32 bit mode and old iron.
583 */
584 #ifdef CONFIG_32BIT
585 #define __GET_USER_UNALIGNED_DW(val, ptr) \
586 __get_user_unaligned_asm_ll32(val, ptr)
587 #endif
588 #ifdef CONFIG_64BIT
589 #define __GET_USER_UNALIGNED_DW(val, ptr) \
590 __get_user_unaligned_asm(val, "uld", ptr)
591 #endif
592
593 extern void __get_user_unaligned_unknown(void);
594
595 #define __get_user_unaligned_common(val, size, ptr) \
596 do { \
597 switch (size) { \
598 case 1: __get_data_asm(val, "lb", ptr); break; \
599 case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \
600 case 4: __get_user_unaligned_asm(val, "ulw", ptr); break; \
601 case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \
602 default: __get_user_unaligned_unknown(); break; \
603 } \
604 } while (0)
605
606 #define __get_user_unaligned_nocheck(x,ptr,size) \
607 ({ \
608 int __gu_err; \
609 \
610 __get_user_unaligned_common((x), size, ptr); \
611 __gu_err; \
612 })
613
614 #define __get_user_unaligned_check(x,ptr,size) \
615 ({ \
616 int __gu_err = -EFAULT; \
617 const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
618 \
619 if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
620 __get_user_unaligned_common((x), size, __gu_ptr); \
621 \
622 __gu_err; \
623 })
624
625 #define __get_data_unaligned_asm(val, insn, addr) \
626 { \
627 long __gu_tmp; \
628 \
629 __asm__ __volatile__( \
630 "1: " insn " %1, %3 \n" \
631 "2: \n" \
632 " .insn \n" \
633 " .section .fixup,\"ax\" \n" \
634 "3: li %0, %4 \n" \
635 " move %1, $0 \n" \
636 " j 2b \n" \
637 " .previous \n" \
638 " .section __ex_table,\"a\" \n" \
639 " "__UA_ADDR "\t1b, 3b \n" \
640 " "__UA_ADDR "\t1b + 4, 3b \n" \
641 " .previous \n" \
642 : "=r" (__gu_err), "=r" (__gu_tmp) \
643 : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
644 \
645 (val) = (__typeof__(*(addr))) __gu_tmp; \
646 }
647
648 /*
649 * Get a long long 64 using 32 bit registers.
650 */
651 #define __get_user_unaligned_asm_ll32(val, addr) \
652 { \
653 unsigned long long __gu_tmp; \
654 \
655 __asm__ __volatile__( \
656 "1: ulw %1, (%3) \n" \
657 "2: ulw %D1, 4(%3) \n" \
658 " move %0, $0 \n" \
659 "3: \n" \
660 " .insn \n" \
661 " .section .fixup,\"ax\" \n" \
662 "4: li %0, %4 \n" \
663 " move %1, $0 \n" \
664 " move %D1, $0 \n" \
665 " j 3b \n" \
666 " .previous \n" \
667 " .section __ex_table,\"a\" \n" \
668 " " __UA_ADDR " 1b, 4b \n" \
669 " " __UA_ADDR " 1b + 4, 4b \n" \
670 " " __UA_ADDR " 2b, 4b \n" \
671 " " __UA_ADDR " 2b + 4, 4b \n" \
672 " .previous \n" \
673 : "=r" (__gu_err), "=&r" (__gu_tmp) \
674 : "0" (0), "r" (addr), "i" (-EFAULT)); \
675 (val) = (__typeof__(*(addr))) __gu_tmp; \
676 }
677
678 /*
679 * Yuck. We need two variants, one for 64bit operation and one
680 * for 32 bit mode and old iron.
681 */
682 #ifdef CONFIG_32BIT
683 #define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm_ll32(ptr)
684 #endif
685 #ifdef CONFIG_64BIT
686 #define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr)
687 #endif
688
689 #define __put_user_unaligned_common(ptr, size) \
690 do { \
691 switch (size) { \
692 case 1: __put_data_asm("sb", ptr); break; \
693 case 2: __put_user_unaligned_asm("ush", ptr); break; \
694 case 4: __put_user_unaligned_asm("usw", ptr); break; \
695 case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \
696 default: __put_user_unaligned_unknown(); break; \
697 } while (0)
698
699 #define __put_user_unaligned_nocheck(x,ptr,size) \
700 ({ \
701 __typeof__(*(ptr)) __pu_val; \
702 int __pu_err = 0; \
703 \
704 __pu_val = (x); \
705 __put_user_unaligned_common(ptr, size); \
706 __pu_err; \
707 })
708
709 #define __put_user_unaligned_check(x,ptr,size) \
710 ({ \
711 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
712 __typeof__(*(ptr)) __pu_val = (x); \
713 int __pu_err = -EFAULT; \
714 \
715 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
716 __put_user_unaligned_common(__pu_addr, size); \
717 \
718 __pu_err; \
719 })
720
721 #define __put_user_unaligned_asm(insn, ptr) \
722 { \
723 __asm__ __volatile__( \
724 "1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \
725 "2: \n" \
726 " .insn \n" \
727 " .section .fixup,\"ax\" \n" \
728 "3: li %0, %4 \n" \
729 " j 2b \n" \
730 " .previous \n" \
731 " .section __ex_table,\"a\" \n" \
732 " " __UA_ADDR " 1b, 3b \n" \
733 " .previous \n" \
734 : "=r" (__pu_err) \
735 : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
736 "i" (-EFAULT)); \
737 }
738
739 #define __put_user_unaligned_asm_ll32(ptr) \
740 { \
741 __asm__ __volatile__( \
742 "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \
743 "2: sw %D2, 4(%3) \n" \
744 "3: \n" \
745 " .insn \n" \
746 " .section .fixup,\"ax\" \n" \
747 "4: li %0, %4 \n" \
748 " j 3b \n" \
749 " .previous \n" \
750 " .section __ex_table,\"a\" \n" \
751 " " __UA_ADDR " 1b, 4b \n" \
752 " " __UA_ADDR " 1b + 4, 4b \n" \
753 " " __UA_ADDR " 2b, 4b \n" \
754 " " __UA_ADDR " 2b + 4, 4b \n" \
755 " .previous" \
756 : "=r" (__pu_err) \
757 : "0" (0), "r" (__pu_val), "r" (ptr), \
758 "i" (-EFAULT)); \
759 }
760
761 extern void __put_user_unaligned_unknown(void);
762 #endif
763
764 /*
765 * We're generating jump to subroutines which will be outside the range of
766 * jump instructions
767 */
768 #ifdef MODULE
769 #define __MODULE_JAL(destination) \
770 ".set\tnoat\n\t" \
771 __UA_LA "\t$1, " #destination "\n\t" \
772 "jalr\t$1\n\t" \
773 ".set\tat\n\t"
774 #else
775 #define __MODULE_JAL(destination) \
776 "jal\t" #destination "\n\t"
777 #endif
778
779 #if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) && \
780 defined(CONFIG_CPU_HAS_PREFETCH))
781 #define DADDI_SCRATCH "$3"
782 #else
783 #define DADDI_SCRATCH "$0"
784 #endif
785
786 extern size_t __copy_user(void *__to, const void *__from, size_t __n);
787
788 #ifndef CONFIG_EVA
789 #define __invoke_copy_to_user(to, from, n) \
790 ({ \
791 register void __user *__cu_to_r __asm__("$4"); \
792 register const void *__cu_from_r __asm__("$5"); \
793 register long __cu_len_r __asm__("$6"); \
794 \
795 __cu_to_r = (to); \
796 __cu_from_r = (from); \
797 __cu_len_r = (n); \
798 __asm__ __volatile__( \
799 __MODULE_JAL(__copy_user) \
800 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
801 : \
802 : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
803 DADDI_SCRATCH, "memory"); \
804 __cu_len_r; \
805 })
806
807 #define __invoke_copy_to_kernel(to, from, n) \
808 __invoke_copy_to_user(to, from, n)
809
810 #endif
811
812 /*
813 * __copy_to_user: - Copy a block of data into user space, with less checking.
814 * @to: Destination address, in user space.
815 * @from: Source address, in kernel space.
816 * @n: Number of bytes to copy.
817 *
818 * Context: User context only. This function may sleep.
819 *
820 * Copy data from kernel space to user space. Caller must check
821 * the specified block with access_ok() before calling this function.
822 *
823 * Returns number of bytes that could not be copied.
824 * On success, this will be zero.
825 */
826 #define __copy_to_user(to, from, n) \
827 ({ \
828 void __user *__cu_to; \
829 const void *__cu_from; \
830 long __cu_len; \
831 \
832 __cu_to = (to); \
833 __cu_from = (from); \
834 __cu_len = (n); \
835 might_fault(); \
836 if (segment_eq(get_fs(), get_ds())) \
837 __cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
838 __cu_len); \
839 else \
840 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
841 __cu_len); \
842 __cu_len; \
843 })
844
845 extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
846
847 #define __copy_to_user_inatomic(to, from, n) \
848 ({ \
849 void __user *__cu_to; \
850 const void *__cu_from; \
851 long __cu_len; \
852 \
853 __cu_to = (to); \
854 __cu_from = (from); \
855 __cu_len = (n); \
856 if (segment_eq(get_fs(), get_ds())) \
857 __cu_len = __invoke_copy_to_kernel(__cu_to, __cu_from, \
858 __cu_len); \
859 else \
860 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
861 __cu_len); \
862 __cu_len; \
863 })
864
865 #define __copy_from_user_inatomic(to, from, n) \
866 ({ \
867 void *__cu_to; \
868 const void __user *__cu_from; \
869 long __cu_len; \
870 \
871 __cu_to = (to); \
872 __cu_from = (from); \
873 __cu_len = (n); \
874 if (segment_eq(get_fs(), get_ds())) \
875 __cu_len = __invoke_copy_from_kernel_inatomic(__cu_to, \
876 __cu_from,\
877 __cu_len);\
878 else \
879 __cu_len = __invoke_copy_from_user_inatomic(__cu_to, \
880 __cu_from, \
881 __cu_len); \
882 __cu_len; \
883 })
884
885 /*
886 * copy_to_user: - Copy a block of data into user space.
887 * @to: Destination address, in user space.
888 * @from: Source address, in kernel space.
889 * @n: Number of bytes to copy.
890 *
891 * Context: User context only. This function may sleep.
892 *
893 * Copy data from kernel space to user space.
894 *
895 * Returns number of bytes that could not be copied.
896 * On success, this will be zero.
897 */
898 #define copy_to_user(to, from, n) \
899 ({ \
900 void __user *__cu_to; \
901 const void *__cu_from; \
902 long __cu_len; \
903 \
904 __cu_to = (to); \
905 __cu_from = (from); \
906 __cu_len = (n); \
907 if (segment_eq(get_fs(), get_ds())) { \
908 __cu_len = __invoke_copy_to_kernel(__cu_to, \
909 __cu_from, \
910 __cu_len); \
911 } else { \
912 if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
913 might_fault(); \
914 __cu_len = __invoke_copy_to_user(__cu_to, \
915 __cu_from, \
916 __cu_len); \
917 } \
918 } \
919 __cu_len; \
920 })
921
922 #ifndef CONFIG_EVA
923
924 #define __invoke_copy_from_user(to, from, n) \
925 ({ \
926 register void *__cu_to_r __asm__("$4"); \
927 register const void __user *__cu_from_r __asm__("$5"); \
928 register long __cu_len_r __asm__("$6"); \
929 \
930 __cu_to_r = (to); \
931 __cu_from_r = (from); \
932 __cu_len_r = (n); \
933 __asm__ __volatile__( \
934 ".set\tnoreorder\n\t" \
935 __MODULE_JAL(__copy_user) \
936 ".set\tnoat\n\t" \
937 __UA_ADDU "\t$1, %1, %2\n\t" \
938 ".set\tat\n\t" \
939 ".set\treorder" \
940 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
941 : \
942 : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
943 DADDI_SCRATCH, "memory"); \
944 __cu_len_r; \
945 })
946
947 #define __invoke_copy_from_kernel(to, from, n) \
948 __invoke_copy_from_user(to, from, n)
949
950 /* For userland <-> userland operations */
951 #define ___invoke_copy_in_user(to, from, n) \
952 __invoke_copy_from_user(to, from, n)
953
954 /* For kernel <-> kernel operations */
955 #define ___invoke_copy_in_kernel(to, from, n) \
956 __invoke_copy_from_user(to, from, n)
957
958 #define __invoke_copy_from_user_inatomic(to, from, n) \
959 ({ \
960 register void *__cu_to_r __asm__("$4"); \
961 register const void __user *__cu_from_r __asm__("$5"); \
962 register long __cu_len_r __asm__("$6"); \
963 \
964 __cu_to_r = (to); \
965 __cu_from_r = (from); \
966 __cu_len_r = (n); \
967 __asm__ __volatile__( \
968 ".set\tnoreorder\n\t" \
969 __MODULE_JAL(__copy_user_inatomic) \
970 ".set\tnoat\n\t" \
971 __UA_ADDU "\t$1, %1, %2\n\t" \
972 ".set\tat\n\t" \
973 ".set\treorder" \
974 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
975 : \
976 : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
977 DADDI_SCRATCH, "memory"); \
978 __cu_len_r; \
979 })
980
981 #define __invoke_copy_from_kernel_inatomic(to, from, n) \
982 __invoke_copy_from_user_inatomic(to, from, n) \
983
984 #else
985
986 /* EVA specific functions */
987
988 extern size_t __copy_user_inatomic_eva(void *__to, const void *__from,
989 size_t __n);
990 extern size_t __copy_from_user_eva(void *__to, const void *__from,
991 size_t __n);
992 extern size_t __copy_to_user_eva(void *__to, const void *__from,
993 size_t __n);
994 extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
995
996 #define __invoke_copy_from_user_eva_generic(to, from, n, func_ptr) \
997 ({ \
998 register void *__cu_to_r __asm__("$4"); \
999 register const void __user *__cu_from_r __asm__("$5"); \
1000 register long __cu_len_r __asm__("$6"); \
1001 \
1002 __cu_to_r = (to); \
1003 __cu_from_r = (from); \
1004 __cu_len_r = (n); \
1005 __asm__ __volatile__( \
1006 ".set\tnoreorder\n\t" \
1007 __MODULE_JAL(func_ptr) \
1008 ".set\tnoat\n\t" \
1009 __UA_ADDU "\t$1, %1, %2\n\t" \
1010 ".set\tat\n\t" \
1011 ".set\treorder" \
1012 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
1013 : \
1014 : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
1015 DADDI_SCRATCH, "memory"); \
1016 __cu_len_r; \
1017 })
1018
1019 #define __invoke_copy_to_user_eva_generic(to, from, n, func_ptr) \
1020 ({ \
1021 register void *__cu_to_r __asm__("$4"); \
1022 register const void __user *__cu_from_r __asm__("$5"); \
1023 register long __cu_len_r __asm__("$6"); \
1024 \
1025 __cu_to_r = (to); \
1026 __cu_from_r = (from); \
1027 __cu_len_r = (n); \
1028 __asm__ __volatile__( \
1029 __MODULE_JAL(func_ptr) \
1030 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
1031 : \
1032 : "$8", "$9", "$10", "$11", "$12", "$14", "$15", "$24", "$31", \
1033 DADDI_SCRATCH, "memory"); \
1034 __cu_len_r; \
1035 })
1036
1037 /*
1038 * Source or destination address is in userland. We need to go through
1039 * the TLB
1040 */
1041 #define __invoke_copy_from_user(to, from, n) \
1042 __invoke_copy_from_user_eva_generic(to, from, n, __copy_from_user_eva)
1043
1044 #define __invoke_copy_from_user_inatomic(to, from, n) \
1045 __invoke_copy_from_user_eva_generic(to, from, n, \
1046 __copy_user_inatomic_eva)
1047
1048 #define __invoke_copy_to_user(to, from, n) \
1049 __invoke_copy_to_user_eva_generic(to, from, n, __copy_to_user_eva)
1050
1051 #define ___invoke_copy_in_user(to, from, n) \
1052 __invoke_copy_from_user_eva_generic(to, from, n, __copy_in_user_eva)
1053
1054 /*
1055 * Source or destination address in the kernel. We are not going through
1056 * the TLB
1057 */
1058 #define __invoke_copy_from_kernel(to, from, n) \
1059 __invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
1060
1061 #define __invoke_copy_from_kernel_inatomic(to, from, n) \
1062 __invoke_copy_from_user_eva_generic(to, from, n, __copy_user_inatomic)
1063
1064 #define __invoke_copy_to_kernel(to, from, n) \
1065 __invoke_copy_to_user_eva_generic(to, from, n, __copy_user)
1066
1067 #define ___invoke_copy_in_kernel(to, from, n) \
1068 __invoke_copy_from_user_eva_generic(to, from, n, __copy_user)
1069
1070 #endif /* CONFIG_EVA */
1071
1072 /*
1073 * __copy_from_user: - Copy a block of data from user space, with less checking.
1074 * @to: Destination address, in kernel space.
1075 * @from: Source address, in user space.
1076 * @n: Number of bytes to copy.
1077 *
1078 * Context: User context only. This function may sleep.
1079 *
1080 * Copy data from user space to kernel space. Caller must check
1081 * the specified block with access_ok() before calling this function.
1082 *
1083 * Returns number of bytes that could not be copied.
1084 * On success, this will be zero.
1085 *
1086 * If some data could not be copied, this function will pad the copied
1087 * data to the requested size using zero bytes.
1088 */
1089 #define __copy_from_user(to, from, n) \
1090 ({ \
1091 void *__cu_to; \
1092 const void __user *__cu_from; \
1093 long __cu_len; \
1094 \
1095 __cu_to = (to); \
1096 __cu_from = (from); \
1097 __cu_len = (n); \
1098 might_fault(); \
1099 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
1100 __cu_len); \
1101 __cu_len; \
1102 })
1103
1104 /*
1105 * copy_from_user: - Copy a block of data from user space.
1106 * @to: Destination address, in kernel space.
1107 * @from: Source address, in user space.
1108 * @n: Number of bytes to copy.
1109 *
1110 * Context: User context only. This function may sleep.
1111 *
1112 * Copy data from user space to kernel space.
1113 *
1114 * Returns number of bytes that could not be copied.
1115 * On success, this will be zero.
1116 *
1117 * If some data could not be copied, this function will pad the copied
1118 * data to the requested size using zero bytes.
1119 */
1120 #define copy_from_user(to, from, n) \
1121 ({ \
1122 void *__cu_to; \
1123 const void __user *__cu_from; \
1124 long __cu_len; \
1125 \
1126 __cu_to = (to); \
1127 __cu_from = (from); \
1128 __cu_len = (n); \
1129 if (segment_eq(get_fs(), get_ds())) { \
1130 __cu_len = __invoke_copy_from_kernel(__cu_to, \
1131 __cu_from, \
1132 __cu_len); \
1133 } else { \
1134 if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
1135 might_fault(); \
1136 __cu_len = __invoke_copy_from_user(__cu_to, \
1137 __cu_from, \
1138 __cu_len); \
1139 } \
1140 } \
1141 __cu_len; \
1142 })
1143
1144 #define __copy_in_user(to, from, n) \
1145 ({ \
1146 void __user *__cu_to; \
1147 const void __user *__cu_from; \
1148 long __cu_len; \
1149 \
1150 __cu_to = (to); \
1151 __cu_from = (from); \
1152 __cu_len = (n); \
1153 if (segment_eq(get_fs(), get_ds())) { \
1154 __cu_len = ___invoke_copy_in_kernel(__cu_to, __cu_from, \
1155 __cu_len); \
1156 } else { \
1157 might_fault(); \
1158 __cu_len = ___invoke_copy_in_user(__cu_to, __cu_from, \
1159 __cu_len); \
1160 } \
1161 __cu_len; \
1162 })
1163
1164 #define copy_in_user(to, from, n) \
1165 ({ \
1166 void __user *__cu_to; \
1167 const void __user *__cu_from; \
1168 long __cu_len; \
1169 \
1170 __cu_to = (to); \
1171 __cu_from = (from); \
1172 __cu_len = (n); \
1173 if (segment_eq(get_fs(), get_ds())) { \
1174 __cu_len = ___invoke_copy_in_kernel(__cu_to,__cu_from, \
1175 __cu_len); \
1176 } else { \
1177 if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) &&\
1178 access_ok(VERIFY_WRITE, __cu_to, __cu_len))) {\
1179 might_fault(); \
1180 __cu_len = ___invoke_copy_in_user(__cu_to, \
1181 __cu_from, \
1182 __cu_len); \
1183 } \
1184 } \
1185 __cu_len; \
1186 })
1187
1188 /*
1189 * __clear_user: - Zero a block of memory in user space, with less checking.
1190 * @to: Destination address, in user space.
1191 * @n: Number of bytes to zero.
1192 *
1193 * Zero a block of memory in user space. Caller must check
1194 * the specified block with access_ok() before calling this function.
1195 *
1196 * Returns number of bytes that could not be cleared.
1197 * On success, this will be zero.
1198 */
1199 static inline __kernel_size_t
1200 __clear_user(void __user *addr, __kernel_size_t size)
1201 {
1202 __kernel_size_t res;
1203
1204 might_fault();
1205 __asm__ __volatile__(
1206 "move\t$4, %1\n\t"
1207 "move\t$5, $0\n\t"
1208 "move\t$6, %2\n\t"
1209 __MODULE_JAL(__bzero)
1210 "move\t%0, $6"
1211 : "=r" (res)
1212 : "r" (addr), "r" (size)
1213 : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
1214
1215 return res;
1216 }
1217
1218 #define clear_user(addr,n) \
1219 ({ \
1220 void __user * __cl_addr = (addr); \
1221 unsigned long __cl_size = (n); \
1222 if (__cl_size && access_ok(VERIFY_WRITE, \
1223 __cl_addr, __cl_size)) \
1224 __cl_size = __clear_user(__cl_addr, __cl_size); \
1225 __cl_size; \
1226 })
1227
1228 /*
1229 * __strncpy_from_user: - Copy a NUL terminated string from userspace, with less checking.
1230 * @dst: Destination address, in kernel space. This buffer must be at
1231 * least @count bytes long.
1232 * @src: Source address, in user space.
1233 * @count: Maximum number of bytes to copy, including the trailing NUL.
1234 *
1235 * Copies a NUL-terminated string from userspace to kernel space.
1236 * Caller must check the specified block with access_ok() before calling
1237 * this function.
1238 *
1239 * On success, returns the length of the string (not including the trailing
1240 * NUL).
1241 *
1242 * If access to userspace fails, returns -EFAULT (some data may have been
1243 * copied).
1244 *
1245 * If @count is smaller than the length of the string, copies @count bytes
1246 * and returns @count.
1247 */
1248 static inline long
1249 __strncpy_from_user(char *__to, const char __user *__from, long __len)
1250 {
1251 long res;
1252
1253 if (segment_eq(get_fs(), get_ds())) {
1254 __asm__ __volatile__(
1255 "move\t$4, %1\n\t"
1256 "move\t$5, %2\n\t"
1257 "move\t$6, %3\n\t"
1258 __MODULE_JAL(__strncpy_from_kernel_nocheck_asm)
1259 "move\t%0, $2"
1260 : "=r" (res)
1261 : "r" (__to), "r" (__from), "r" (__len)
1262 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
1263 } else {
1264 might_fault();
1265 __asm__ __volatile__(
1266 "move\t$4, %1\n\t"
1267 "move\t$5, %2\n\t"
1268 "move\t$6, %3\n\t"
1269 __MODULE_JAL(__strncpy_from_user_nocheck_asm)
1270 "move\t%0, $2"
1271 : "=r" (res)
1272 : "r" (__to), "r" (__from), "r" (__len)
1273 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
1274 }
1275
1276 return res;
1277 }
1278
1279 /*
1280 * strncpy_from_user: - Copy a NUL terminated string from userspace.
1281 * @dst: Destination address, in kernel space. This buffer must be at
1282 * least @count bytes long.
1283 * @src: Source address, in user space.
1284 * @count: Maximum number of bytes to copy, including the trailing NUL.
1285 *
1286 * Copies a NUL-terminated string from userspace to kernel space.
1287 *
1288 * On success, returns the length of the string (not including the trailing
1289 * NUL).
1290 *
1291 * If access to userspace fails, returns -EFAULT (some data may have been
1292 * copied).
1293 *
1294 * If @count is smaller than the length of the string, copies @count bytes
1295 * and returns @count.
1296 */
1297 static inline long
1298 strncpy_from_user(char *__to, const char __user *__from, long __len)
1299 {
1300 long res;
1301
1302 if (segment_eq(get_fs(), get_ds())) {
1303 __asm__ __volatile__(
1304 "move\t$4, %1\n\t"
1305 "move\t$5, %2\n\t"
1306 "move\t$6, %3\n\t"
1307 __MODULE_JAL(__strncpy_from_kernel_asm)
1308 "move\t%0, $2"
1309 : "=r" (res)
1310 : "r" (__to), "r" (__from), "r" (__len)
1311 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
1312 } else {
1313 might_fault();
1314 __asm__ __volatile__(
1315 "move\t$4, %1\n\t"
1316 "move\t$5, %2\n\t"
1317 "move\t$6, %3\n\t"
1318 __MODULE_JAL(__strncpy_from_user_asm)
1319 "move\t%0, $2"
1320 : "=r" (res)
1321 : "r" (__to), "r" (__from), "r" (__len)
1322 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
1323 }
1324
1325 return res;
1326 }
1327
1328 /* Returns: 0 if bad, string length+1 (memory size) of string if ok */
1329 static inline long __strlen_user(const char __user *s)
1330 {
1331 long res;
1332
1333 if (segment_eq(get_fs(), get_ds())) {
1334 __asm__ __volatile__(
1335 "move\t$4, %1\n\t"
1336 __MODULE_JAL(__strlen_kernel_nocheck_asm)
1337 "move\t%0, $2"
1338 : "=r" (res)
1339 : "r" (s)
1340 : "$2", "$4", __UA_t0, "$31");
1341 } else {
1342 might_fault();
1343 __asm__ __volatile__(
1344 "move\t$4, %1\n\t"
1345 __MODULE_JAL(__strlen_user_nocheck_asm)
1346 "move\t%0, $2"
1347 : "=r" (res)
1348 : "r" (s)
1349 : "$2", "$4", __UA_t0, "$31");
1350 }
1351
1352 return res;
1353 }
1354
1355 /*
1356 * strlen_user: - Get the size of a string in user space.
1357 * @str: The string to measure.
1358 *
1359 * Context: User context only. This function may sleep.
1360 *
1361 * Get the size of a NUL-terminated string in user space.
1362 *
1363 * Returns the size of the string INCLUDING the terminating NUL.
1364 * On exception, returns 0.
1365 *
1366 * If there is a limit on the length of a valid string, you may wish to
1367 * consider using strnlen_user() instead.
1368 */
1369 static inline long strlen_user(const char __user *s)
1370 {
1371 long res;
1372
1373 if (segment_eq(get_fs(), get_ds())) {
1374 __asm__ __volatile__(
1375 "move\t$4, %1\n\t"
1376 __MODULE_JAL(__strlen_kernel_asm)
1377 "move\t%0, $2"
1378 : "=r" (res)
1379 : "r" (s)
1380 : "$2", "$4", __UA_t0, "$31");
1381 } else {
1382 might_fault();
1383 __asm__ __volatile__(
1384 "move\t$4, %1\n\t"
1385 __MODULE_JAL(__strlen_kernel_asm)
1386 "move\t%0, $2"
1387 : "=r" (res)
1388 : "r" (s)
1389 : "$2", "$4", __UA_t0, "$31");
1390 }
1391
1392 return res;
1393 }
1394
1395 /* Returns: 0 if bad, string length+1 (memory size) of string if ok */
1396 static inline long __strnlen_user(const char __user *s, long n)
1397 {
1398 long res;
1399
1400 if (segment_eq(get_fs(), get_ds())) {
1401 __asm__ __volatile__(
1402 "move\t$4, %1\n\t"
1403 "move\t$5, %2\n\t"
1404 __MODULE_JAL(__strnlen_kernel_nocheck_asm)
1405 "move\t%0, $2"
1406 : "=r" (res)
1407 : "r" (s), "r" (n)
1408 : "$2", "$4", "$5", __UA_t0, "$31");
1409 } else {
1410 might_fault();
1411 __asm__ __volatile__(
1412 "move\t$4, %1\n\t"
1413 "move\t$5, %2\n\t"
1414 __MODULE_JAL(__strnlen_user_nocheck_asm)
1415 "move\t%0, $2"
1416 : "=r" (res)
1417 : "r" (s), "r" (n)
1418 : "$2", "$4", "$5", __UA_t0, "$31");
1419 }
1420
1421 return res;
1422 }
1423
1424 /*
1425 * strnlen_user: - Get the size of a string in user space.
1426 * @str: The string to measure.
1427 *
1428 * Context: User context only. This function may sleep.
1429 *
1430 * Get the size of a NUL-terminated string in user space.
1431 *
1432 * Returns the size of the string INCLUDING the terminating NUL.
1433 * On exception, returns 0.
1434 * If the string is too long, returns a value greater than @n.
1435 */
1436 static inline long strnlen_user(const char __user *s, long n)
1437 {
1438 long res;
1439
1440 might_fault();
1441 if (segment_eq(get_fs(), get_ds())) {
1442 __asm__ __volatile__(
1443 "move\t$4, %1\n\t"
1444 "move\t$5, %2\n\t"
1445 __MODULE_JAL(__strnlen_kernel_asm)
1446 "move\t%0, $2"
1447 : "=r" (res)
1448 : "r" (s), "r" (n)
1449 : "$2", "$4", "$5", __UA_t0, "$31");
1450 } else {
1451 __asm__ __volatile__(
1452 "move\t$4, %1\n\t"
1453 "move\t$5, %2\n\t"
1454 __MODULE_JAL(__strnlen_user_asm)
1455 "move\t%0, $2"
1456 : "=r" (res)
1457 : "r" (s), "r" (n)
1458 : "$2", "$4", "$5", __UA_t0, "$31");
1459 }
1460
1461 return res;
1462 }
1463
1464 struct exception_table_entry
1465 {
1466 unsigned long insn;
1467 unsigned long nextinsn;
1468 };
1469
1470 extern int fixup_exception(struct pt_regs *regs);
1471
1472 #endif /* _ASM_UACCESS_H */
Linux kernel - Deliverables
This page took 0.062565 seconds and 5 git commands to generate.