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10#ifndef _ASM_UACCESS_H
11#define _ASM_UACCESS_H
12
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/thread_info.h>
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23
24#ifdef CONFIG_32BIT
25
26#define __UA_LIMIT 0x80000000UL
27
28#define __UA_ADDR ".word"
29#define __UA_LA "la"
30#define __UA_ADDU "addu"
31#define __UA_t0 "$8"
32#define __UA_t1 "$9"
33
34#endif
35
36#ifdef CONFIG_64BIT
37
38#define __UA_LIMIT (- TASK_SIZE)
39
40#define __UA_ADDR ".dword"
41#define __UA_LA "dla"
42#define __UA_ADDU "daddu"
43#define __UA_t0 "$12"
44#define __UA_t1 "$13"
45
46#endif
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54
55
56#define KERNEL_DS ((mm_segment_t) { 0UL })
57#define USER_DS ((mm_segment_t) { __UA_LIMIT })
58
59#define VERIFY_READ 0
60#define VERIFY_WRITE 1
61
62#define get_ds() (KERNEL_DS)
63#define get_fs() (current_thread_info()->addr_limit)
64#define set_fs(x) (current_thread_info()->addr_limit = (x))
65
66#define segment_eq(a, b) ((a).seg == (b).seg)
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82#define __ua_size(size) \
83 ((__builtin_constant_p(size) && (signed long) (size) > 0) ? 0 : (size))
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105#define __access_mask get_fs().seg
106
107#define __access_ok(addr, size, mask) \
108({ \
109 unsigned long __addr = (unsigned long) (addr); \
110 unsigned long __size = size; \
111 unsigned long __mask = mask; \
112 unsigned long __ok; \
113 \
114 __chk_user_ptr(addr); \
115 __ok = (signed long)(__mask & (__addr | (__addr + __size) | \
116 __ua_size(__size))); \
117 __ok == 0; \
118})
119
120#define access_ok(type, addr, size) \
121 likely(__access_ok((addr), (size), __access_mask))
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139#define put_user(x,ptr) \
140 __put_user_check((x), (ptr), sizeof(*(ptr)))
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159#define get_user(x,ptr) \
160 __get_user_check((x), (ptr), sizeof(*(ptr)))
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181#define __put_user(x,ptr) \
182 __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
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204#define __get_user(x,ptr) \
205 __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
206
207struct __large_struct { unsigned long buf[100]; };
208#define __m(x) (*(struct __large_struct __user *)(x))
209
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213
214#ifdef CONFIG_32BIT
215#define __GET_USER_DW(val, ptr) __get_user_asm_ll32(val, ptr)
216#endif
217#ifdef CONFIG_64BIT
218#define __GET_USER_DW(val, ptr) __get_user_asm(val, "ld", ptr)
219#endif
220
221extern void __get_user_unknown(void);
222
223#define __get_user_common(val, size, ptr) \
224do { \
225 switch (size) { \
226 case 1: __get_user_asm(val, "lb", ptr); break; \
227 case 2: __get_user_asm(val, "lh", ptr); break; \
228 case 4: __get_user_asm(val, "lw", ptr); break; \
229 case 8: __GET_USER_DW(val, ptr); break; \
230 default: __get_user_unknown(); break; \
231 } \
232} while (0)
233
234#define __get_user_nocheck(x, ptr, size) \
235({ \
236 int __gu_err; \
237 \
238 __chk_user_ptr(ptr); \
239 __get_user_common((x), size, ptr); \
240 __gu_err; \
241})
242
243#define __get_user_check(x, ptr, size) \
244({ \
245 int __gu_err = -EFAULT; \
246 const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
247 \
248 might_fault(); \
249 if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
250 __get_user_common((x), size, __gu_ptr); \
251 \
252 __gu_err; \
253})
254
255#define __get_user_asm(val, insn, addr) \
256{ \
257 long __gu_tmp; \
258 \
259 __asm__ __volatile__( \
260 "1: " insn " %1, %3 \n" \
261 "2: \n" \
262 " .section .fixup,\"ax\" \n" \
263 "3: li %0, %4 \n" \
264 " j 2b \n" \
265 " .previous \n" \
266 " .section __ex_table,\"a\" \n" \
267 " "__UA_ADDR "\t1b, 3b \n" \
268 " .previous \n" \
269 : "=r" (__gu_err), "=r" (__gu_tmp) \
270 : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
271 \
272 (val) = (__typeof__(*(addr))) __gu_tmp; \
273}
274
275
276
277
278#define __get_user_asm_ll32(val, addr) \
279{ \
280 union { \
281 unsigned long long l; \
282 __typeof__(*(addr)) t; \
283 } __gu_tmp; \
284 \
285 __asm__ __volatile__( \
286 "1: lw %1, (%3) \n" \
287 "2: lw %D1, 4(%3) \n" \
288 "3: .section .fixup,\"ax\" \n" \
289 "4: li %0, %4 \n" \
290 " move %1, $0 \n" \
291 " move %D1, $0 \n" \
292 " j 3b \n" \
293 " .previous \n" \
294 " .section __ex_table,\"a\" \n" \
295 " " __UA_ADDR " 1b, 4b \n" \
296 " " __UA_ADDR " 2b, 4b \n" \
297 " .previous \n" \
298 : "=r" (__gu_err), "=&r" (__gu_tmp.l) \
299 : "0" (0), "r" (addr), "i" (-EFAULT)); \
300 \
301 (val) = __gu_tmp.t; \
302}
303
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307
308#ifdef CONFIG_32BIT
309#define __PUT_USER_DW(ptr) __put_user_asm_ll32(ptr)
310#endif
311#ifdef CONFIG_64BIT
312#define __PUT_USER_DW(ptr) __put_user_asm("sd", ptr)
313#endif
314
315#define __put_user_nocheck(x, ptr, size) \
316({ \
317 __typeof__(*(ptr)) __pu_val; \
318 int __pu_err = 0; \
319 \
320 __chk_user_ptr(ptr); \
321 __pu_val = (x); \
322 switch (size) { \
323 case 1: __put_user_asm("sb", ptr); break; \
324 case 2: __put_user_asm("sh", ptr); break; \
325 case 4: __put_user_asm("sw", ptr); break; \
326 case 8: __PUT_USER_DW(ptr); break; \
327 default: __put_user_unknown(); break; \
328 } \
329 __pu_err; \
330})
331
332#define __put_user_check(x, ptr, size) \
333({ \
334 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
335 __typeof__(*(ptr)) __pu_val = (x); \
336 int __pu_err = -EFAULT; \
337 \
338 might_fault(); \
339 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
340 switch (size) { \
341 case 1: __put_user_asm("sb", __pu_addr); break; \
342 case 2: __put_user_asm("sh", __pu_addr); break; \
343 case 4: __put_user_asm("sw", __pu_addr); break; \
344 case 8: __PUT_USER_DW(__pu_addr); break; \
345 default: __put_user_unknown(); break; \
346 } \
347 } \
348 __pu_err; \
349})
350
351#define __put_user_asm(insn, ptr) \
352{ \
353 __asm__ __volatile__( \
354 "1: " insn " %z2, %3 # __put_user_asm\n" \
355 "2: \n" \
356 " .section .fixup,\"ax\" \n" \
357 "3: li %0, %4 \n" \
358 " j 2b \n" \
359 " .previous \n" \
360 " .section __ex_table,\"a\" \n" \
361 " " __UA_ADDR " 1b, 3b \n" \
362 " .previous \n" \
363 : "=r" (__pu_err) \
364 : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
365 "i" (-EFAULT)); \
366}
367
368#define __put_user_asm_ll32(ptr) \
369{ \
370 __asm__ __volatile__( \
371 "1: sw %2, (%3) # __put_user_asm_ll32 \n" \
372 "2: sw %D2, 4(%3) \n" \
373 "3: \n" \
374 " .section .fixup,\"ax\" \n" \
375 "4: li %0, %4 \n" \
376 " j 3b \n" \
377 " .previous \n" \
378 " .section __ex_table,\"a\" \n" \
379 " " __UA_ADDR " 1b, 4b \n" \
380 " " __UA_ADDR " 2b, 4b \n" \
381 " .previous" \
382 : "=r" (__pu_err) \
383 : "0" (0), "r" (__pu_val), "r" (ptr), \
384 "i" (-EFAULT)); \
385}
386
387extern void __put_user_unknown(void);
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405#define put_user_unaligned(x,ptr) \
406 __put_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
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425#define get_user_unaligned(x,ptr) \
426 __get_user_unaligned_check((x),(ptr),sizeof(*(ptr)))
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447#define __put_user_unaligned(x,ptr) \
448 __put_user_unaligned_nocheck((x),(ptr),sizeof(*(ptr)))
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470#define __get_user_unaligned(x,ptr) \
471 __get_user__unalignednocheck((x),(ptr),sizeof(*(ptr)))
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476
477#ifdef CONFIG_32BIT
478#define __GET_USER_UNALIGNED_DW(val, ptr) \
479 __get_user_unaligned_asm_ll32(val, ptr)
480#endif
481#ifdef CONFIG_64BIT
482#define __GET_USER_UNALIGNED_DW(val, ptr) \
483 __get_user_unaligned_asm(val, "uld", ptr)
484#endif
485
486extern void __get_user_unaligned_unknown(void);
487
488#define __get_user_unaligned_common(val, size, ptr) \
489do { \
490 switch (size) { \
491 case 1: __get_user_asm(val, "lb", ptr); break; \
492 case 2: __get_user_unaligned_asm(val, "ulh", ptr); break; \
493 case 4: __get_user_unaligned_asm(val, "ulw", ptr); break; \
494 case 8: __GET_USER_UNALIGNED_DW(val, ptr); break; \
495 default: __get_user_unaligned_unknown(); break; \
496 } \
497} while (0)
498
499#define __get_user_unaligned_nocheck(x,ptr,size) \
500({ \
501 int __gu_err; \
502 \
503 __get_user_unaligned_common((x), size, ptr); \
504 __gu_err; \
505})
506
507#define __get_user_unaligned_check(x,ptr,size) \
508({ \
509 int __gu_err = -EFAULT; \
510 const __typeof__(*(ptr)) __user * __gu_ptr = (ptr); \
511 \
512 if (likely(access_ok(VERIFY_READ, __gu_ptr, size))) \
513 __get_user_unaligned_common((x), size, __gu_ptr); \
514 \
515 __gu_err; \
516})
517
518#define __get_user_unaligned_asm(val, insn, addr) \
519{ \
520 long __gu_tmp; \
521 \
522 __asm__ __volatile__( \
523 "1: " insn " %1, %3 \n" \
524 "2: \n" \
525 " .section .fixup,\"ax\" \n" \
526 "3: li %0, %4 \n" \
527 " j 2b \n" \
528 " .previous \n" \
529 " .section __ex_table,\"a\" \n" \
530 " "__UA_ADDR "\t1b, 3b \n" \
531 " "__UA_ADDR "\t1b + 4, 3b \n" \
532 " .previous \n" \
533 : "=r" (__gu_err), "=r" (__gu_tmp) \
534 : "0" (0), "o" (__m(addr)), "i" (-EFAULT)); \
535 \
536 (val) = (__typeof__(*(addr))) __gu_tmp; \
537}
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541
542#define __get_user_unaligned_asm_ll32(val, addr) \
543{ \
544 unsigned long long __gu_tmp; \
545 \
546 __asm__ __volatile__( \
547 "1: ulw %1, (%3) \n" \
548 "2: ulw %D1, 4(%3) \n" \
549 " move %0, $0 \n" \
550 "3: .section .fixup,\"ax\" \n" \
551 "4: li %0, %4 \n" \
552 " move %1, $0 \n" \
553 " move %D1, $0 \n" \
554 " j 3b \n" \
555 " .previous \n" \
556 " .section __ex_table,\"a\" \n" \
557 " " __UA_ADDR " 1b, 4b \n" \
558 " " __UA_ADDR " 1b + 4, 4b \n" \
559 " " __UA_ADDR " 2b, 4b \n" \
560 " " __UA_ADDR " 2b + 4, 4b \n" \
561 " .previous \n" \
562 : "=r" (__gu_err), "=&r" (__gu_tmp) \
563 : "0" (0), "r" (addr), "i" (-EFAULT)); \
564 (val) = (__typeof__(*(addr))) __gu_tmp; \
565}
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571#ifdef CONFIG_32BIT
572#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm_ll32(ptr)
573#endif
574#ifdef CONFIG_64BIT
575#define __PUT_USER_UNALIGNED_DW(ptr) __put_user_unaligned_asm("usd", ptr)
576#endif
577
578#define __put_user_unaligned_nocheck(x,ptr,size) \
579({ \
580 __typeof__(*(ptr)) __pu_val; \
581 int __pu_err = 0; \
582 \
583 __pu_val = (x); \
584 switch (size) { \
585 case 1: __put_user_asm("sb", ptr); break; \
586 case 2: __put_user_unaligned_asm("ush", ptr); break; \
587 case 4: __put_user_unaligned_asm("usw", ptr); break; \
588 case 8: __PUT_USER_UNALIGNED_DW(ptr); break; \
589 default: __put_user_unaligned_unknown(); break; \
590 } \
591 __pu_err; \
592})
593
594#define __put_user_unaligned_check(x,ptr,size) \
595({ \
596 __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
597 __typeof__(*(ptr)) __pu_val = (x); \
598 int __pu_err = -EFAULT; \
599 \
600 if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) { \
601 switch (size) { \
602 case 1: __put_user_asm("sb", __pu_addr); break; \
603 case 2: __put_user_unaligned_asm("ush", __pu_addr); break; \
604 case 4: __put_user_unaligned_asm("usw", __pu_addr); break; \
605 case 8: __PUT_USER_UNALGINED_DW(__pu_addr); break; \
606 default: __put_user_unaligned_unknown(); break; \
607 } \
608 } \
609 __pu_err; \
610})
611
612#define __put_user_unaligned_asm(insn, ptr) \
613{ \
614 __asm__ __volatile__( \
615 "1: " insn " %z2, %3 # __put_user_unaligned_asm\n" \
616 "2: \n" \
617 " .section .fixup,\"ax\" \n" \
618 "3: li %0, %4 \n" \
619 " j 2b \n" \
620 " .previous \n" \
621 " .section __ex_table,\"a\" \n" \
622 " " __UA_ADDR " 1b, 3b \n" \
623 " .previous \n" \
624 : "=r" (__pu_err) \
625 : "0" (0), "Jr" (__pu_val), "o" (__m(ptr)), \
626 "i" (-EFAULT)); \
627}
628
629#define __put_user_unaligned_asm_ll32(ptr) \
630{ \
631 __asm__ __volatile__( \
632 "1: sw %2, (%3) # __put_user_unaligned_asm_ll32 \n" \
633 "2: sw %D2, 4(%3) \n" \
634 "3: \n" \
635 " .section .fixup,\"ax\" \n" \
636 "4: li %0, %4 \n" \
637 " j 3b \n" \
638 " .previous \n" \
639 " .section __ex_table,\"a\" \n" \
640 " " __UA_ADDR " 1b, 4b \n" \
641 " " __UA_ADDR " 1b + 4, 4b \n" \
642 " " __UA_ADDR " 2b, 4b \n" \
643 " " __UA_ADDR " 2b + 4, 4b \n" \
644 " .previous" \
645 : "=r" (__pu_err) \
646 : "0" (0), "r" (__pu_val), "r" (ptr), \
647 "i" (-EFAULT)); \
648}
649
650extern void __put_user_unaligned_unknown(void);
651
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654
655
656#ifdef MODULE
657#define __MODULE_JAL(destination) \
658 ".set\tnoat\n\t" \
659 __UA_LA "\t$1, " #destination "\n\t" \
660 "jalr\t$1\n\t" \
661 ".set\tat\n\t"
662#else
663#define __MODULE_JAL(destination) \
664 "jal\t" #destination "\n\t"
665#endif
666
667#ifndef CONFIG_CPU_DADDI_WORKAROUNDS
668#define DADDI_SCRATCH "$0"
669#else
670#define DADDI_SCRATCH "$3"
671#endif
672
673extern size_t __copy_user(void *__to, const void *__from, size_t __n);
674
675#define __invoke_copy_to_user(to, from, n) \
676({ \
677 register void __user *__cu_to_r __asm__("$4"); \
678 register const void *__cu_from_r __asm__("$5"); \
679 register long __cu_len_r __asm__("$6"); \
680 \
681 __cu_to_r = (to); \
682 __cu_from_r = (from); \
683 __cu_len_r = (n); \
684 __asm__ __volatile__( \
685 __MODULE_JAL(__copy_user) \
686 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
687 : \
688 : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
689 DADDI_SCRATCH, "memory"); \
690 __cu_len_r; \
691})
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707#define __copy_to_user(to, from, n) \
708({ \
709 void __user *__cu_to; \
710 const void *__cu_from; \
711 long __cu_len; \
712 \
713 __cu_to = (to); \
714 __cu_from = (from); \
715 __cu_len = (n); \
716 might_fault(); \
717 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
718 __cu_len; \
719})
720
721extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
722
723#define __copy_to_user_inatomic(to, from, n) \
724({ \
725 void __user *__cu_to; \
726 const void *__cu_from; \
727 long __cu_len; \
728 \
729 __cu_to = (to); \
730 __cu_from = (from); \
731 __cu_len = (n); \
732 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, __cu_len); \
733 __cu_len; \
734})
735
736#define __copy_from_user_inatomic(to, from, n) \
737({ \
738 void *__cu_to; \
739 const void __user *__cu_from; \
740 long __cu_len; \
741 \
742 __cu_to = (to); \
743 __cu_from = (from); \
744 __cu_len = (n); \
745 __cu_len = __invoke_copy_from_user_inatomic(__cu_to, __cu_from, \
746 __cu_len); \
747 __cu_len; \
748})
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763#define copy_to_user(to, from, n) \
764({ \
765 void __user *__cu_to; \
766 const void *__cu_from; \
767 long __cu_len; \
768 \
769 __cu_to = (to); \
770 __cu_from = (from); \
771 __cu_len = (n); \
772 if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) { \
773 might_fault(); \
774 __cu_len = __invoke_copy_to_user(__cu_to, __cu_from, \
775 __cu_len); \
776 } \
777 __cu_len; \
778})
779
780#define __invoke_copy_from_user(to, from, n) \
781({ \
782 register void *__cu_to_r __asm__("$4"); \
783 register const void __user *__cu_from_r __asm__("$5"); \
784 register long __cu_len_r __asm__("$6"); \
785 \
786 __cu_to_r = (to); \
787 __cu_from_r = (from); \
788 __cu_len_r = (n); \
789 __asm__ __volatile__( \
790 ".set\tnoreorder\n\t" \
791 __MODULE_JAL(__copy_user) \
792 ".set\tnoat\n\t" \
793 __UA_ADDU "\t$1, %1, %2\n\t" \
794 ".set\tat\n\t" \
795 ".set\treorder" \
796 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
797 : \
798 : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
799 DADDI_SCRATCH, "memory"); \
800 __cu_len_r; \
801})
802
803#define __invoke_copy_from_user_inatomic(to, from, n) \
804({ \
805 register void *__cu_to_r __asm__("$4"); \
806 register const void __user *__cu_from_r __asm__("$5"); \
807 register long __cu_len_r __asm__("$6"); \
808 \
809 __cu_to_r = (to); \
810 __cu_from_r = (from); \
811 __cu_len_r = (n); \
812 __asm__ __volatile__( \
813 ".set\tnoreorder\n\t" \
814 __MODULE_JAL(__copy_user_inatomic) \
815 ".set\tnoat\n\t" \
816 __UA_ADDU "\t$1, %1, %2\n\t" \
817 ".set\tat\n\t" \
818 ".set\treorder" \
819 : "+r" (__cu_to_r), "+r" (__cu_from_r), "+r" (__cu_len_r) \
820 : \
821 : "$8", "$9", "$10", "$11", "$12", "$15", "$24", "$31", \
822 DADDI_SCRATCH, "memory"); \
823 __cu_len_r; \
824})
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843#define __copy_from_user(to, from, n) \
844({ \
845 void *__cu_to; \
846 const void __user *__cu_from; \
847 long __cu_len; \
848 \
849 __cu_to = (to); \
850 __cu_from = (from); \
851 __cu_len = (n); \
852 might_fault(); \
853 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
854 __cu_len); \
855 __cu_len; \
856})
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874#define copy_from_user(to, from, n) \
875({ \
876 void *__cu_to; \
877 const void __user *__cu_from; \
878 long __cu_len; \
879 \
880 __cu_to = (to); \
881 __cu_from = (from); \
882 __cu_len = (n); \
883 if (access_ok(VERIFY_READ, __cu_from, __cu_len)) { \
884 might_fault(); \
885 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
886 __cu_len); \
887 } \
888 __cu_len; \
889})
890
891#define __copy_in_user(to, from, n) \
892({ \
893 void __user *__cu_to; \
894 const void __user *__cu_from; \
895 long __cu_len; \
896 \
897 __cu_to = (to); \
898 __cu_from = (from); \
899 __cu_len = (n); \
900 might_fault(); \
901 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
902 __cu_len); \
903 __cu_len; \
904})
905
906#define copy_in_user(to, from, n) \
907({ \
908 void __user *__cu_to; \
909 const void __user *__cu_from; \
910 long __cu_len; \
911 \
912 __cu_to = (to); \
913 __cu_from = (from); \
914 __cu_len = (n); \
915 if (likely(access_ok(VERIFY_READ, __cu_from, __cu_len) && \
916 access_ok(VERIFY_WRITE, __cu_to, __cu_len))) { \
917 might_fault(); \
918 __cu_len = __invoke_copy_from_user(__cu_to, __cu_from, \
919 __cu_len); \
920 } \
921 __cu_len; \
922})
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935static inline __kernel_size_t
936__clear_user(void __user *addr, __kernel_size_t size)
937{
938 __kernel_size_t res;
939
940 might_fault();
941 __asm__ __volatile__(
942 "move\t$4, %1\n\t"
943 "move\t$5, $0\n\t"
944 "move\t$6, %2\n\t"
945 __MODULE_JAL(__bzero)
946 "move\t%0, $6"
947 : "=r" (res)
948 : "r" (addr), "r" (size)
949 : "$4", "$5", "$6", __UA_t0, __UA_t1, "$31");
950
951 return res;
952}
953
954#define clear_user(addr,n) \
955({ \
956 void __user * __cl_addr = (addr); \
957 unsigned long __cl_size = (n); \
958 if (__cl_size && access_ok(VERIFY_WRITE, \
959 __cl_addr, __cl_size)) \
960 __cl_size = __clear_user(__cl_addr, __cl_size); \
961 __cl_size; \
962})
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984static inline long
985__strncpy_from_user(char *__to, const char __user *__from, long __len)
986{
987 long res;
988
989 might_fault();
990 __asm__ __volatile__(
991 "move\t$4, %1\n\t"
992 "move\t$5, %2\n\t"
993 "move\t$6, %3\n\t"
994 __MODULE_JAL(__strncpy_from_user_nocheck_asm)
995 "move\t%0, $2"
996 : "=r" (res)
997 : "r" (__to), "r" (__from), "r" (__len)
998 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
999
1000 return res;
1001}
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1021static inline long
1022strncpy_from_user(char *__to, const char __user *__from, long __len)
1023{
1024 long res;
1025
1026 might_fault();
1027 __asm__ __volatile__(
1028 "move\t$4, %1\n\t"
1029 "move\t$5, %2\n\t"
1030 "move\t$6, %3\n\t"
1031 __MODULE_JAL(__strncpy_from_user_asm)
1032 "move\t%0, $2"
1033 : "=r" (res)
1034 : "r" (__to), "r" (__from), "r" (__len)
1035 : "$2", "$3", "$4", "$5", "$6", __UA_t0, "$31", "memory");
1036
1037 return res;
1038}
1039
1040
1041static inline long __strlen_user(const char __user *s)
1042{
1043 long res;
1044
1045 might_fault();
1046 __asm__ __volatile__(
1047 "move\t$4, %1\n\t"
1048 __MODULE_JAL(__strlen_user_nocheck_asm)
1049 "move\t%0, $2"
1050 : "=r" (res)
1051 : "r" (s)
1052 : "$2", "$4", __UA_t0, "$31");
1053
1054 return res;
1055}
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1071static inline long strlen_user(const char __user *s)
1072{
1073 long res;
1074
1075 might_fault();
1076 __asm__ __volatile__(
1077 "move\t$4, %1\n\t"
1078 __MODULE_JAL(__strlen_user_asm)
1079 "move\t%0, $2"
1080 : "=r" (res)
1081 : "r" (s)
1082 : "$2", "$4", __UA_t0, "$31");
1083
1084 return res;
1085}
1086
1087
1088static inline long __strnlen_user(const char __user *s, long n)
1089{
1090 long res;
1091
1092 might_fault();
1093 __asm__ __volatile__(
1094 "move\t$4, %1\n\t"
1095 "move\t$5, %2\n\t"
1096 __MODULE_JAL(__strnlen_user_nocheck_asm)
1097 "move\t%0, $2"
1098 : "=r" (res)
1099 : "r" (s), "r" (n)
1100 : "$2", "$4", "$5", __UA_t0, "$31");
1101
1102 return res;
1103}
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1119static inline long strnlen_user(const char __user *s, long n)
1120{
1121 long res;
1122
1123 might_fault();
1124 __asm__ __volatile__(
1125 "move\t$4, %1\n\t"
1126 "move\t$5, %2\n\t"
1127 __MODULE_JAL(__strnlen_user_asm)
1128 "move\t%0, $2"
1129 : "=r" (res)
1130 : "r" (s), "r" (n)
1131 : "$2", "$4", "$5", __UA_t0, "$31");
1132
1133 return res;
1134}
1135
1136struct exception_table_entry
1137{
1138 unsigned long insn;
1139 unsigned long nextinsn;
1140};
1141
1142extern int fixup_exception(struct pt_regs *regs);
1143
1144#endif
1145