summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/signal_32.c
blob: dd1dca5bfa81fbebfbce7bcf1e2b1a72842e3a9b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
/*
 * Signal handling for 32bit PPC and 32bit tasks on 64bit PPC
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 * Copyright (C) 2001 IBM
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
 *
 *  Derived from "arch/i386/kernel/signal.c"
 *    Copyright (C) 1991, 1992 Linus Torvalds
 *    1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 */

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/elf.h>
#ifdef CONFIG_PPC64
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/ptrace.h>
#else
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/tty.h>
#include <linux/binfmts.h>
#include <linux/freezer.h>
#endif

#include <asm/uaccess.h>
#include <asm/cacheflush.h>
#include <asm/syscalls.h>
#include <asm/sigcontext.h>
#include <asm/vdso.h>
#ifdef CONFIG_PPC64
#include "ppc32.h"
#include <asm/unistd.h>
#else
#include <asm/ucontext.h>
#include <asm/pgtable.h>
#endif

#undef DEBUG_SIG

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

#ifdef CONFIG_PPC64
#define do_signal	do_signal32
#define sys_sigsuspend	compat_sys_sigsuspend
#define sys_rt_sigsuspend	compat_sys_rt_sigsuspend
#define sys_rt_sigreturn	compat_sys_rt_sigreturn
#define sys_sigaction	compat_sys_sigaction
#define sys_swapcontext	compat_sys_swapcontext
#define sys_sigreturn	compat_sys_sigreturn

#define old_sigaction	old_sigaction32
#define sigcontext	sigcontext32
#define mcontext	mcontext32
#define ucontext	ucontext32

/*
 * Returning 0 means we return to userspace via
 * ret_from_except and thus restore all user
 * registers from *regs.  This is what we need
 * to do when a signal has been delivered.
 */

#define GP_REGS_SIZE	min(sizeof(elf_gregset_t32), sizeof(struct pt_regs32))
#undef __SIGNAL_FRAMESIZE
#define __SIGNAL_FRAMESIZE	__SIGNAL_FRAMESIZE32
#undef ELF_NVRREG
#define ELF_NVRREG	ELF_NVRREG32

/*
 * Functions for flipping sigsets (thanks to brain dead generic
 * implementation that makes things simple for little endian only)
 */
static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set)
{
	compat_sigset_t	cset;

	switch (_NSIG_WORDS) {
	case 4: cset.sig[5] = set->sig[3] & 0xffffffffull;
		cset.sig[7] = set->sig[3] >> 32;
	case 3: cset.sig[4] = set->sig[2] & 0xffffffffull;
		cset.sig[5] = set->sig[2] >> 32;
	case 2: cset.sig[2] = set->sig[1] & 0xffffffffull;
		cset.sig[3] = set->sig[1] >> 32;
	case 1: cset.sig[0] = set->sig[0] & 0xffffffffull;
		cset.sig[1] = set->sig[0] >> 32;
	}
	return copy_to_user(uset, &cset, sizeof(*uset));
}

static inline int get_sigset_t(sigset_t *set,
			       const compat_sigset_t __user *uset)
{
	compat_sigset_t s32;

	if (copy_from_user(&s32, uset, sizeof(*uset)))
		return -EFAULT;

	/*
	 * Swap the 2 words of the 64-bit sigset_t (they are stored
	 * in the "wrong" endian in 32-bit user storage).
	 */
	switch (_NSIG_WORDS) {
	case 4: set->sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
	case 3: set->sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
	case 2: set->sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
	case 1: set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
	}
	return 0;
}

static inline int get_old_sigaction(struct k_sigaction *new_ka,
		struct old_sigaction __user *act)
{
	compat_old_sigset_t mask;
	compat_uptr_t handler, restorer;

	if (get_user(handler, &act->sa_handler) ||
	    __get_user(restorer, &act->sa_restorer) ||
	    __get_user(new_ka->sa.sa_flags, &act->sa_flags) ||
	    __get_user(mask, &act->sa_mask))
		return -EFAULT;
	new_ka->sa.sa_handler = compat_ptr(handler);
	new_ka->sa.sa_restorer = compat_ptr(restorer);
	siginitset(&new_ka->sa.sa_mask, mask);
	return 0;
}

#define to_user_ptr(p)		ptr_to_compat(p)
#define from_user_ptr(p)	compat_ptr(p)

static inline int save_general_regs(struct pt_regs *regs,
		struct mcontext __user *frame)
{
	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
	int i;

	WARN_ON(!FULL_REGS(regs));

	for (i = 0; i <= PT_RESULT; i ++) {
		if (i == 14 && !FULL_REGS(regs))
			i = 32;
		if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
			return -EFAULT;
	}
	return 0;
}

static inline int restore_general_regs(struct pt_regs *regs,
		struct mcontext __user *sr)
{
	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
	int i;

	for (i = 0; i <= PT_RESULT; i++) {
		if ((i == PT_MSR) || (i == PT_SOFTE))
			continue;
		if (__get_user(gregs[i], &sr->mc_gregs[i]))
			return -EFAULT;
	}
	return 0;
}

#else /* CONFIG_PPC64 */

#define GP_REGS_SIZE	min(sizeof(elf_gregset_t), sizeof(struct pt_regs))

static inline int put_sigset_t(sigset_t __user *uset, sigset_t *set)
{
	return copy_to_user(uset, set, sizeof(*uset));
}

static inline int get_sigset_t(sigset_t *set, const sigset_t __user *uset)
{
	return copy_from_user(set, uset, sizeof(*uset));
}

static inline int get_old_sigaction(struct k_sigaction *new_ka,
		struct old_sigaction __user *act)
{
	old_sigset_t mask;

	if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
			__get_user(new_ka->sa.sa_handler, &act->sa_handler) ||
			__get_user(new_ka->sa.sa_restorer, &act->sa_restorer))
		return -EFAULT;
	__get_user(new_ka->sa.sa_flags, &act->sa_flags);
	__get_user(mask, &act->sa_mask);
	siginitset(&new_ka->sa.sa_mask, mask);
	return 0;
}

#define to_user_ptr(p)		((unsigned long)(p))
#define from_user_ptr(p)	((void __user *)(p))

static inline int save_general_regs(struct pt_regs *regs,
		struct mcontext __user *frame)
{
	WARN_ON(!FULL_REGS(regs));
	return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
}

static inline int restore_general_regs(struct pt_regs *regs,
		struct mcontext __user *sr)
{
	/* copy up to but not including MSR */
	if (__copy_from_user(regs, &sr->mc_gregs,
				PT_MSR * sizeof(elf_greg_t)))
		return -EFAULT;
	/* copy from orig_r3 (the word after the MSR) up to the end */
	if (__copy_from_user(&regs->orig_gpr3, &sr->mc_gregs[PT_ORIG_R3],
				GP_REGS_SIZE - PT_ORIG_R3 * sizeof(elf_greg_t)))
		return -EFAULT;
	return 0;
}

#endif /* CONFIG_PPC64 */

int do_signal(sigset_t *oldset, struct pt_regs *regs);

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
long sys_sigsuspend(old_sigset_t mask)
{
	mask &= _BLOCKABLE;
	spin_lock_irq(&current->sighand->siglock);
	current->saved_sigmask = current->blocked;
	siginitset(&current->blocked, mask);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
 	set_thread_flag(TIF_RESTORE_SIGMASK);
 	return -ERESTARTNOHAND;
}

#ifdef CONFIG_PPC32
long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss, int r5,
		int r6, int r7, int r8, struct pt_regs *regs)
{
	return do_sigaltstack(uss, uoss, regs->gpr[1]);
}
#endif

long sys_sigaction(int sig, struct old_sigaction __user *act,
		struct old_sigaction __user *oact)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

#ifdef CONFIG_PPC64
	if (sig < 0)
		sig = -sig;
#endif

	if (act) {
		if (get_old_sigaction(&new_ka, act))
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	if (!ret && oact) {
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(to_user_ptr(old_ka.sa.sa_handler),
			    &oact->sa_handler) ||
		    __put_user(to_user_ptr(old_ka.sa.sa_restorer),
			    &oact->sa_restorer) ||
		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
			return -EFAULT;
	}

	return ret;
}

/*
 * When we have signals to deliver, we set up on the
 * user stack, going down from the original stack pointer:
 *	a sigregs struct
 *	a sigcontext struct
 *	a gap of __SIGNAL_FRAMESIZE bytes
 *
 * Each of these things must be a multiple of 16 bytes in size.
 *
 */
struct sigregs {
	struct mcontext	mctx;		/* all the register values */
	/*
	 * Programs using the rs6000/xcoff abi can save up to 19 gp
	 * regs and 18 fp regs below sp before decrementing it.
	 */
	int			abigap[56];
};

/* We use the mc_pad field for the signal return trampoline. */
#define tramp	mc_pad

/*
 *  When we have rt signals to deliver, we set up on the
 *  user stack, going down from the original stack pointer:
 *	one rt_sigframe struct (siginfo + ucontext + ABI gap)
 *	a gap of __SIGNAL_FRAMESIZE+16 bytes
 *  (the +16 is to get the siginfo and ucontext in the same
 *  positions as in older kernels).
 *
 *  Each of these things must be a multiple of 16 bytes in size.
 *
 */
struct rt_sigframe {
#ifdef CONFIG_PPC64
	compat_siginfo_t info;
#else
	struct siginfo info;
#endif
	struct ucontext	uc;
	/*
	 * Programs using the rs6000/xcoff abi can save up to 19 gp
	 * regs and 18 fp regs below sp before decrementing it.
	 */
	int			abigap[56];
};

/*
 * Save the current user registers on the user stack.
 * We only save the altivec/spe registers if the process has used
 * altivec/spe instructions at some point.
 */
static int save_user_regs(struct pt_regs *regs, struct mcontext __user *frame,
		int sigret)
{
	/* Make sure floating point registers are stored in regs */
	flush_fp_to_thread(current);

	/* save general and floating-point registers */
	if (save_general_regs(regs, frame) ||
	    __copy_to_user(&frame->mc_fregs, current->thread.fpr,
		    ELF_NFPREG * sizeof(double)))
		return 1;

#ifdef CONFIG_ALTIVEC
	/* save altivec registers */
	if (current->thread.used_vr) {
		flush_altivec_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, current->thread.vr,
				   ELF_NVRREG * sizeof(vector128)))
			return 1;
		/* set MSR_VEC in the saved MSR value to indicate that
		   frame->mc_vregs contains valid data */
		if (__put_user(regs->msr | MSR_VEC, &frame->mc_gregs[PT_MSR]))
			return 1;
	}
	/* else assert((regs->msr & MSR_VEC) == 0) */

	/* We always copy to/from vrsave, it's 0 if we don't have or don't
	 * use altivec. Since VSCR only contains 32 bits saved in the least
	 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
	 * most significant bits of that same vector. --BenH
	 */
	if (__put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32]))
		return 1;
#endif /* CONFIG_ALTIVEC */

#ifdef CONFIG_SPE
	/* save spe registers */
	if (current->thread.used_spe) {
		flush_spe_to_thread(current);
		if (__copy_to_user(&frame->mc_vregs, current->thread.evr,
				   ELF_NEVRREG * sizeof(u32)))
			return 1;
		/* set MSR_SPE in the saved MSR value to indicate that
		   frame->mc_vregs contains valid data */
		if (__put_user(regs->msr | MSR_SPE, &frame->mc_gregs[PT_MSR]))
			return 1;
	}
	/* else assert((regs->msr & MSR_SPE) == 0) */

	/* We always copy to/from spefscr */
	if (__put_user(current->thread.spefscr, (u32 __user *)&frame->mc_vregs + ELF_NEVRREG))
		return 1;
#endif /* CONFIG_SPE */

	if (sigret) {
		/* Set up the sigreturn trampoline: li r0,sigret; sc */
		if (__put_user(0x38000000UL + sigret, &frame->tramp[0])
		    || __put_user(0x44000002UL, &frame->tramp[1]))
			return 1;
		flush_icache_range((unsigned long) &frame->tramp[0],
				   (unsigned long) &frame->tramp[2]);
	}

	return 0;
}

/*
 * Restore the current user register values from the user stack,
 * (except for MSR).
 */
static long restore_user_regs(struct pt_regs *regs,
			      struct mcontext __user *sr, int sig)
{
	long err;
	unsigned int save_r2 = 0;
	unsigned long msr;

	/*
	 * restore general registers but not including MSR or SOFTE. Also
	 * take care of keeping r2 (TLS) intact if not a signal
	 */
	if (!sig)
		save_r2 = (unsigned int)regs->gpr[2];
	err = restore_general_regs(regs, sr);
	err |= __get_user(msr, &sr->mc_gregs[PT_MSR]);
	if (!sig)
		regs->gpr[2] = (unsigned long) save_r2;
	if (err)
		return 1;

	/* if doing signal return, restore the previous little-endian mode */
	if (sig)
		regs->msr = (regs->msr & ~MSR_LE) | (msr & MSR_LE);

	/*
	 * Do this before updating the thread state in
	 * current->thread.fpr/vr/evr.  That way, if we get preempted
	 * and another task grabs the FPU/Altivec/SPE, it won't be
	 * tempted to save the current CPU state into the thread_struct
	 * and corrupt what we are writing there.
	 */
	discard_lazy_cpu_state();

	/* force the process to reload the FP registers from
	   current->thread when it next does FP instructions */
	regs->msr &= ~(MSR_FP | MSR_FE0 | MSR_FE1);
	if (__copy_from_user(current->thread.fpr, &sr->mc_fregs,
			     sizeof(sr->mc_fregs)))
		return 1;

#ifdef CONFIG_ALTIVEC
	/* force the process to reload the altivec registers from
	   current->thread when it next does altivec instructions */
	regs->msr &= ~MSR_VEC;
	if (msr & MSR_VEC) {
		/* restore altivec registers from the stack */
		if (__copy_from_user(current->thread.vr, &sr->mc_vregs,
				     sizeof(sr->mc_vregs)))
			return 1;
	} else if (current->thread.used_vr)
		memset(current->thread.vr, 0, ELF_NVRREG * sizeof(vector128));

	/* Always get VRSAVE back */
	if (__get_user(current->thread.vrsave, (u32 __user *)&sr->mc_vregs[32]))
		return 1;
#endif /* CONFIG_ALTIVEC */

#ifdef CONFIG_SPE
	/* force the process to reload the spe registers from
	   current->thread when it next does spe instructions */
	regs->msr &= ~MSR_SPE;
	if (msr & MSR_SPE) {
		/* restore spe registers from the stack */
		if (__copy_from_user(current->thread.evr, &sr->mc_vregs,
				     ELF_NEVRREG * sizeof(u32)))
			return 1;
	} else if (current->thread.used_spe)
		memset(current->thread.evr, 0, ELF_NEVRREG * sizeof(u32));

	/* Always get SPEFSCR back */
	if (__get_user(current->thread.spefscr, (u32 __user *)&sr->mc_vregs + ELF_NEVRREG))
		return 1;
#endif /* CONFIG_SPE */

	return 0;
}

#ifdef CONFIG_PPC64
long compat_sys_rt_sigaction(int sig, const struct sigaction32 __user *act,
		struct sigaction32 __user *oact, size_t sigsetsize)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(compat_sigset_t))
		return -EINVAL;

	if (act) {
		compat_uptr_t handler;

		ret = get_user(handler, &act->sa_handler);
		new_ka.sa.sa_handler = compat_ptr(handler);
		ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
		if (ret)
			return -EFAULT;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
	if (!ret && oact) {
		ret = put_user(to_user_ptr(old_ka.sa.sa_handler), &oact->sa_handler);
		ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	}
	return ret;
}

/*
 * Note: it is necessary to treat how as an unsigned int, with the
 * corresponding cast to a signed int to insure that the proper
 * conversion (sign extension) between the register representation
 * of a signed int (msr in 32-bit mode) and the register representation
 * of a signed int (msr in 64-bit mode) is performed.
 */
long compat_sys_rt_sigprocmask(u32 how, compat_sigset_t __user *set,
		compat_sigset_t __user *oset, size_t sigsetsize)
{
	sigset_t s;
	sigset_t __user *up;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (set) {
		if (get_sigset_t(&s, set))
			return -EFAULT;
	}

	set_fs(KERNEL_DS);
	/* This is valid because of the set_fs() */
	up = (sigset_t __user *) &s;
	ret = sys_rt_sigprocmask((int)how, set ? up : NULL, oset ? up : NULL,
				 sigsetsize);
	set_fs(old_fs);
	if (ret)
		return ret;
	if (oset) {
		if (put_sigset_t(oset, &s))
			return -EFAULT;
	}
	return 0;
}

long compat_sys_rt_sigpending(compat_sigset_t __user *set, compat_size_t sigsetsize)
{
	sigset_t s;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	/* The __user pointer cast is valid because of the set_fs() */
	ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
	set_fs(old_fs);
	if (!ret) {
		if (put_sigset_t(set, &s))
			return -EFAULT;
	}
	return ret;
}


int copy_siginfo_to_user32(struct compat_siginfo __user *d, siginfo_t *s)
{
	int err;

	if (!access_ok (VERIFY_WRITE, d, sizeof(*d)))
		return -EFAULT;

	/* If you change siginfo_t structure, please be sure
	 * this code is fixed accordingly.
	 * It should never copy any pad contained in the structure
	 * to avoid security leaks, but must copy the generic
	 * 3 ints plus the relevant union member.
	 * This routine must convert siginfo from 64bit to 32bit as well
	 * at the same time.
	 */
	err = __put_user(s->si_signo, &d->si_signo);
	err |= __put_user(s->si_errno, &d->si_errno);
	err |= __put_user((short)s->si_code, &d->si_code);
	if (s->si_code < 0)
		err |= __copy_to_user(&d->_sifields._pad, &s->_sifields._pad,
				      SI_PAD_SIZE32);
	else switch(s->si_code >> 16) {
	case __SI_CHLD >> 16:
		err |= __put_user(s->si_pid, &d->si_pid);
		err |= __put_user(s->si_uid, &d->si_uid);
		err |= __put_user(s->si_utime, &d->si_utime);
		err |= __put_user(s->si_stime, &d->si_stime);
		err |= __put_user(s->si_status, &d->si_status);
		break;
	case __SI_FAULT >> 16:
		err |= __put_user((unsigned int)(unsigned long)s->si_addr,
				  &d->si_addr);
		break;
	case __SI_POLL >> 16:
		err |= __put_user(s->si_band, &d->si_band);
		err |= __put_user(s->si_fd, &d->si_fd);
		break;
	case __SI_TIMER >> 16:
		err |= __put_user(s->si_tid, &d->si_tid);
		err |= __put_user(s->si_overrun, &d->si_overrun);
		err |= __put_user(s->si_int, &d->si_int);
		break;
	case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
	case __SI_MESGQ >> 16:
		err |= __put_user(s->si_int, &d->si_int);
		/* fallthrough */
	case __SI_KILL >> 16:
	default:
		err |= __put_user(s->si_pid, &d->si_pid);
		err |= __put_user(s->si_uid, &d->si_uid);
		break;
	}
	return err;
}

#define copy_siginfo_to_user	copy_siginfo_to_user32

/*
 * Note: it is necessary to treat pid and sig as unsigned ints, with the
 * corresponding cast to a signed int to insure that the proper conversion
 * (sign extension) between the register representation of a signed int
 * (msr in 32-bit mode) and the register representation of a signed int
 * (msr in 64-bit mode) is performed.
 */
long compat_sys_rt_sigqueueinfo(u32 pid, u32 sig, compat_siginfo_t __user *uinfo)
{
	siginfo_t info;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (copy_from_user (&info, uinfo, 3*sizeof(int)) ||
	    copy_from_user (info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE32))
		return -EFAULT;
	set_fs (KERNEL_DS);
	/* The __user pointer cast is valid becasuse of the set_fs() */
	ret = sys_rt_sigqueueinfo((int)pid, (int)sig, (siginfo_t __user *) &info);
	set_fs (old_fs);
	return ret;
}
/*
 *  Start Alternate signal stack support
 *
 *  System Calls
 *       sigaltatck               compat_sys_sigaltstack
 */

int compat_sys_sigaltstack(u32 __new, u32 __old, int r5,
		      int r6, int r7, int r8, struct pt_regs *regs)
{
	stack_32_t __user * newstack = compat_ptr(__new);
	stack_32_t __user * oldstack = compat_ptr(__old);
	stack_t uss, uoss;
	int ret;
	mm_segment_t old_fs;
	unsigned long sp;
	compat_uptr_t ss_sp;

	/*
	 * set sp to the user stack on entry to the system call
	 * the system call router sets R9 to the saved registers
	 */
	sp = regs->gpr[1];

	/* Put new stack info in local 64 bit stack struct */
	if (newstack) {
		if (get_user(ss_sp, &newstack->ss_sp) ||
		    __get_user(uss.ss_flags, &newstack->ss_flags) ||
		    __get_user(uss.ss_size, &newstack->ss_size))
			return -EFAULT;
		uss.ss_sp = compat_ptr(ss_sp);
	}

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	/* The __user pointer casts are valid because of the set_fs() */
	ret = do_sigaltstack(
		newstack ? (stack_t __user *) &uss : NULL,
		oldstack ? (stack_t __user *) &uoss : NULL,
		sp);
	set_fs(old_fs);
	/* Copy the stack information to the user output buffer */
	if (!ret && oldstack  &&
		(put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
		 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
		 __put_user(uoss.ss_size, &oldstack->ss_size)))
		return -EFAULT;
	return ret;
}
#endif /* CONFIG_PPC64 */


/*
 * Restore the user process's signal mask
 */
#ifdef CONFIG_PPC64
extern void restore_sigmask(sigset_t *set);
#else /* CONFIG_PPC64 */
static void restore_sigmask(sigset_t *set)
{
	sigdelsetmask(set, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = *set;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);
}
#endif

/*
 * Set up a signal frame for a "real-time" signal handler
 * (one which gets siginfo).
 */
static int handle_rt_signal(unsigned long sig, struct k_sigaction *ka,
		siginfo_t *info, sigset_t *oldset,
		struct pt_regs *regs, unsigned long newsp)
{
	struct rt_sigframe __user *rt_sf;
	struct mcontext __user *frame;
	unsigned long origsp = newsp;

	/* Set up Signal Frame */
	/* Put a Real Time Context onto stack */
	newsp -= sizeof(*rt_sf);
	rt_sf = (struct rt_sigframe __user *)newsp;

	/* create a stack frame for the caller of the handler */
	newsp -= __SIGNAL_FRAMESIZE + 16;

	if (!access_ok(VERIFY_WRITE, (void __user *)newsp, origsp - newsp))
		goto badframe;

	/* Put the siginfo & fill in most of the ucontext */
	if (copy_siginfo_to_user(&rt_sf->info, info)
	    || __put_user(0, &rt_sf->uc.uc_flags)
	    || __put_user(0, &rt_sf->uc.uc_link)
	    || __put_user(current->sas_ss_sp, &rt_sf->uc.uc_stack.ss_sp)
	    || __put_user(sas_ss_flags(regs->gpr[1]),
			  &rt_sf->uc.uc_stack.ss_flags)
	    || __put_user(current->sas_ss_size, &rt_sf->uc.uc_stack.ss_size)
	    || __put_user(to_user_ptr(&rt_sf->uc.uc_mcontext),
		    &rt_sf->uc.uc_regs)
	    || put_sigset_t(&rt_sf->uc.uc_sigmask, oldset))
		goto badframe;

	/* Save user registers on the stack */
	frame = &rt_sf->uc.uc_mcontext;
	if (vdso32_rt_sigtramp && current->mm->context.vdso_base) {
		if (save_user_regs(regs, frame, 0))
			goto badframe;
		regs->link = current->mm->context.vdso_base + vdso32_rt_sigtramp;
	} else {
		if (save_user_regs(regs, frame, __NR_rt_sigreturn))
			goto badframe;
		regs->link = (unsigned long) frame->tramp;
	}

	current->thread.fpscr.val = 0;	/* turn off all fp exceptions */

	if (put_user(regs->gpr[1], (u32 __user *)newsp))
		goto badframe;
	regs->gpr[1] = newsp;
	regs->gpr[3] = sig;
	regs->gpr[4] = (unsigned long) &rt_sf->info;
	regs->gpr[5] = (unsigned long) &rt_sf->uc;
	regs->gpr[6] = (unsigned long) rt_sf;
	regs->nip = (unsigned long) ka->sa.sa_handler;
	/* enter the signal handler in big-endian mode */
	regs->msr &= ~MSR_LE;
	regs->trap = 0;
	return 1;

badframe:
#ifdef DEBUG_SIG
	printk("badframe in handle_rt_signal, regs=%p frame=%p newsp=%lx\n",
	       regs, frame, newsp);
#endif
	force_sigsegv(sig, current);
	return 0;
}

static int do_setcontext(struct ucontext __user *ucp, struct pt_regs *regs, int sig)
{
	sigset_t set;
	struct mcontext __user *mcp;

	if (get_sigset_t(&set, &ucp->uc_sigmask))
		return -EFAULT;
#ifdef CONFIG_PPC64
	{
		u32 cmcp;

		if (__get_user(cmcp, &ucp->uc_regs))
			return -EFAULT;
		mcp = (struct mcontext __user *)(u64)cmcp;
		/* no need to check access_ok(mcp), since mcp < 4GB */
	}
#else
	if (__get_user(mcp, &ucp->uc_regs))
		return -EFAULT;
	if (!access_ok(VERIFY_READ, mcp, sizeof(*mcp)))
		return -EFAULT;
#endif
	restore_sigmask(&set);
	if (restore_user_regs(regs, mcp, sig))
		return -EFAULT;

	return 0;
}

long sys_swapcontext(struct ucontext __user *old_ctx,
		     struct ucontext __user *new_ctx,
		     int ctx_size, int r6, int r7, int r8, struct pt_regs *regs)
{
	unsigned char tmp;

	/* Context size is for future use. Right now, we only make sure
	 * we are passed something we understand
	 */
	if (ctx_size < sizeof(struct ucontext))
		return -EINVAL;

	if (old_ctx != NULL) {
		struct mcontext __user *mctx;

		/*
		 * old_ctx might not be 16-byte aligned, in which
		 * case old_ctx->uc_mcontext won't be either.
		 * Because we have the old_ctx->uc_pad2 field
		 * before old_ctx->uc_mcontext, we need to round down
		 * from &old_ctx->uc_mcontext to a 16-byte boundary.
		 */
		mctx = (struct mcontext __user *)
			((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
		if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
		    || save_user_regs(regs, mctx, 0)
		    || put_sigset_t(&old_ctx->uc_sigmask, &current->blocked)
		    || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
			return -EFAULT;
	}
	if (new_ctx == NULL)
		return 0;
	if (!access_ok(VERIFY_READ, new_ctx, sizeof(*new_ctx))
	    || __get_user(tmp, (u8 __user *) new_ctx)
	    || __get_user(tmp, (u8 __user *) (new_ctx + 1) - 1))
		return -EFAULT;

	/*
	 * If we get a fault copying the context into the kernel's
	 * image of the user's registers, we can't just return -EFAULT
	 * because the user's registers will be corrupted.  For instance
	 * the NIP value may have been updated but not some of the
	 * other registers.  Given that we have done the access_ok
	 * and successfully read the first and last bytes of the region
	 * above, this should only happen in an out-of-memory situation
	 * or if another thread unmaps the region containing the context.
	 * We kill the task with a SIGSEGV in this situation.
	 */
	if (do_setcontext(new_ctx, regs, 0))
		do_exit(SIGSEGV);

	set_thread_flag(TIF_RESTOREALL);
	return 0;
}

long sys_rt_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
		     struct pt_regs *regs)
{
	struct rt_sigframe __user *rt_sf;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	rt_sf = (struct rt_sigframe __user *)
		(regs->gpr[1] + __SIGNAL_FRAMESIZE + 16);
	if (!access_ok(VERIFY_READ, rt_sf, sizeof(*rt_sf)))
		goto bad;
	if (do_setcontext(&rt_sf->uc, regs, 1))
		goto bad;

	/*
	 * It's not clear whether or why it is desirable to save the
	 * sigaltstack setting on signal delivery and restore it on
	 * signal return.  But other architectures do this and we have
	 * always done it up until now so it is probably better not to
	 * change it.  -- paulus
	 */
#ifdef CONFIG_PPC64
	/*
	 * We use the compat_sys_ version that does the 32/64 bits conversion
	 * and takes userland pointer directly. What about error checking ?
	 * nobody does any...
	 */
	compat_sys_sigaltstack((u32)(u64)&rt_sf->uc.uc_stack, 0, 0, 0, 0, 0, regs);
#else
	do_sigaltstack(&rt_sf->uc.uc_stack, NULL, regs->gpr[1]);
#endif
	set_thread_flag(TIF_RESTOREALL);
	return 0;

 bad:
	force_sig(SIGSEGV, current);
	return 0;
}

#ifdef CONFIG_PPC32
int sys_debug_setcontext(struct ucontext __user *ctx,
			 int ndbg, struct sig_dbg_op __user *dbg,
			 int r6, int r7, int r8,
			 struct pt_regs *regs)
{
	struct sig_dbg_op op;
	int i;
	unsigned char tmp;
	unsigned long new_msr = regs->msr;
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
	unsigned long new_dbcr0 = current->thread.dbcr0;
#endif

	for (i=0; i<ndbg; i++) {
		if (copy_from_user(&op, dbg + i, sizeof(op)))
			return -EFAULT;
		switch (op.dbg_type) {
		case SIG_DBG_SINGLE_STEPPING:
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
			if (op.dbg_value) {
				new_msr |= MSR_DE;
				new_dbcr0 |= (DBCR0_IDM | DBCR0_IC);
			} else {
				new_msr &= ~MSR_DE;
				new_dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
			}
#else
			if (op.dbg_value)
				new_msr |= MSR_SE;
			else
				new_msr &= ~MSR_SE;
#endif
			break;
		case SIG_DBG_BRANCH_TRACING:
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
			return -EINVAL;
#else
			if (op.dbg_value)
				new_msr |= MSR_BE;
			else
				new_msr &= ~MSR_BE;
#endif
			break;

		default:
			return -EINVAL;
		}
	}

	/* We wait until here to actually install the values in the
	   registers so if we fail in the above loop, it will not
	   affect the contents of these registers.  After this point,
	   failure is a problem, anyway, and it's very unlikely unless
	   the user is really doing something wrong. */
	regs->msr = new_msr;
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
	current->thread.dbcr0 = new_dbcr0;
#endif

	if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx))
	    || __get_user(tmp, (u8 __user *) ctx)
	    || __get_user(tmp, (u8 __user *) (ctx + 1) - 1))
		return -EFAULT;

	/*
	 * If we get a fault copying the context into the kernel's
	 * image of the user's registers, we can't just return -EFAULT
	 * because the user's registers will be corrupted.  For instance
	 * the NIP value may have been updated but not some of the
	 * other registers.  Given that we have done the access_ok
	 * and successfully read the first and last bytes of the region
	 * above, this should only happen in an out-of-memory situation
	 * or if another thread unmaps the region containing the context.
	 * We kill the task with a SIGSEGV in this situation.
	 */
	if (do_setcontext(ctx, regs, 1)) {
		force_sig(SIGSEGV, current);
		goto out;
	}

	/*
	 * It's not clear whether or why it is desirable to save the
	 * sigaltstack setting on signal delivery and restore it on
	 * signal return.  But other architectures do this and we have
	 * always done it up until now so it is probably better not to
	 * change it.  -- paulus
	 */
	do_sigaltstack(&ctx->uc_stack, NULL, regs->gpr[1]);

	set_thread_flag(TIF_RESTOREALL);
 out:
	return 0;
}
#endif

/*
 * OK, we're invoking a handler
 */
static int handle_signal(unsigned long sig, struct k_sigaction *ka,
		siginfo_t *info, sigset_t *oldset, struct pt_regs *regs,
		unsigned long newsp)
{
	struct sigcontext __user *sc;
	struct sigregs __user *frame;
	unsigned long origsp = newsp;

	/* Set up Signal Frame */
	newsp -= sizeof(struct sigregs);
	frame = (struct sigregs __user *) newsp;

	/* Put a sigcontext on the stack */
	newsp -= sizeof(*sc);
	sc = (struct sigcontext __user *) newsp;

	/* create a stack frame for the caller of the handler */
	newsp -= __SIGNAL_FRAMESIZE;

	if (!access_ok(VERIFY_WRITE, (void __user *) newsp, origsp - newsp))
		goto badframe;

#if _NSIG != 64
#error "Please adjust handle_signal()"
#endif
	if (__put_user(to_user_ptr(ka->sa.sa_handler), &sc->handler)
	    || __put_user(oldset->sig[0], &sc->oldmask)
#ifdef CONFIG_PPC64
	    || __put_user((oldset->sig[0] >> 32), &sc->_unused[3])
#else
	    || __put_user(oldset->sig[1], &sc->_unused[3])
#endif
	    || __put_user(to_user_ptr(frame), &sc->regs)
	    || __put_user(sig, &sc->signal))
		goto badframe;

	if (vdso32_sigtramp && current->mm->context.vdso_base) {
		if (save_user_regs(regs, &frame->mctx, 0))
			goto badframe;
		regs->link = current->mm->context.vdso_base + vdso32_sigtramp;
	} else {
		if (save_user_regs(regs, &frame->mctx, __NR_sigreturn))
			goto badframe;
		regs->link = (unsigned long) frame->mctx.tramp;
	}

	current->thread.fpscr.val = 0;	/* turn off all fp exceptions */

	if (put_user(regs->gpr[1], (u32 __user *)newsp))
		goto badframe;
	regs->gpr[1] = newsp;
	regs->gpr[3] = sig;
	regs->gpr[4] = (unsigned long) sc;
	regs->nip = (unsigned long) ka->sa.sa_handler;
	/* enter the signal handler in big-endian mode */
	regs->msr &= ~MSR_LE;
	regs->trap = 0;

	return 1;

badframe:
#ifdef DEBUG_SIG
	printk("badframe in handle_signal, regs=%p frame=%p newsp=%lx\n",
	       regs, frame, newsp);
#endif
	force_sigsegv(sig, current);
	return 0;
}

/*
 * Do a signal return; undo the signal stack.
 */
long sys_sigreturn(int r3, int r4, int r5, int r6, int r7, int r8,
		       struct pt_regs *regs)
{
	struct sigcontext __user *sc;
	struct sigcontext sigctx;
	struct mcontext __user *sr;
	sigset_t set;

	/* Always make any pending restarted system calls return -EINTR */
	current_thread_info()->restart_block.fn = do_no_restart_syscall;

	sc = (struct sigcontext __user *)(regs->gpr[1] + __SIGNAL_FRAMESIZE);
	if (copy_from_user(&sigctx, sc, sizeof(sigctx)))
		goto badframe;

#ifdef CONFIG_PPC64
	/*
	 * Note that PPC32 puts the upper 32 bits of the sigmask in the
	 * unused part of the signal stackframe
	 */
	set.sig[0] = sigctx.oldmask + ((long)(sigctx._unused[3]) << 32);
#else
	set.sig[0] = sigctx.oldmask;
	set.sig[1] = sigctx._unused[3];
#endif
	restore_sigmask(&set);

	sr = (struct mcontext __user *)from_user_ptr(sigctx.regs);
	if (!access_ok(VERIFY_READ, sr, sizeof(*sr))
	    || restore_user_regs(regs, sr, 1))
		goto badframe;

	set_thread_flag(TIF_RESTOREALL);
	return 0;

badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

/*
 * Note that 'init' is a special process: it doesn't get signals it doesn't
 * want to handle. Thus you cannot kill init even with a SIGKILL even by
 * mistake.
 */
int do_signal(sigset_t *oldset, struct pt_regs *regs)
{
	siginfo_t info;
	struct k_sigaction ka;
	unsigned int newsp;
	int signr, ret;

#ifdef CONFIG_PPC32
	if (try_to_freeze()) {
		signr = 0;
		if (!signal_pending(current))
			goto no_signal;
	}
#endif

	if (test_thread_flag(TIF_RESTORE_SIGMASK))
		oldset = &current->saved_sigmask;
	else if (!oldset)
		oldset = &current->blocked;

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
#ifdef CONFIG_PPC32
no_signal:
#endif
	if (TRAP(regs) == 0x0C00		/* System Call! */
	    && regs->ccr & 0x10000000		/* error signalled */
	    && ((ret = regs->gpr[3]) == ERESTARTSYS
		|| ret == ERESTARTNOHAND || ret == ERESTARTNOINTR
		|| ret == ERESTART_RESTARTBLOCK)) {

		if (signr > 0
		    && (ret == ERESTARTNOHAND || ret == ERESTART_RESTARTBLOCK
			|| (ret == ERESTARTSYS
			    && !(ka.sa.sa_flags & SA_RESTART)))) {
			/* make the system call return an EINTR error */
			regs->result = -EINTR;
			regs->gpr[3] = EINTR;
			/* note that the cr0.SO bit is already set */
		} else {
			regs->nip -= 4;	/* Back up & retry system call */
			regs->result = 0;
			regs->trap = 0;
			if (ret == ERESTART_RESTARTBLOCK)
				regs->gpr[0] = __NR_restart_syscall;
			else
				regs->gpr[3] = regs->orig_gpr3;
		}
	}

	if (signr == 0) {
		/* No signal to deliver -- put the saved sigmask back */
		if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
			clear_thread_flag(TIF_RESTORE_SIGMASK);
			sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
		}
		return 0;		/* no signals delivered */
	}

	if ((ka.sa.sa_flags & SA_ONSTACK) && current->sas_ss_size
	    && !on_sig_stack(regs->gpr[1]))
		newsp = current->sas_ss_sp + current->sas_ss_size;
	else
		newsp = regs->gpr[1];
	newsp &= ~0xfUL;

#ifdef CONFIG_PPC64
	/*
	 * Reenable the DABR before delivering the signal to
	 * user space. The DABR will have been cleared if it
	 * triggered inside the kernel.
	 */
	if (current->thread.dabr)
		set_dabr(current->thread.dabr);
#endif

	/* Whee!  Actually deliver the signal.  */
	if (ka.sa.sa_flags & SA_SIGINFO)
		ret = handle_rt_signal(signr, &ka, &info, oldset, regs, newsp);
	else
		ret = handle_signal(signr, &ka, &info, oldset, regs, newsp);

	if (ret) {
		spin_lock_irq(&current->sighand->siglock);
		sigorsets(&current->blocked, &current->blocked,
			  &ka.sa.sa_mask);
		if (!(ka.sa.sa_flags & SA_NODEFER))
			sigaddset(&current->blocked, signr);
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
		/* A signal was successfully delivered; the saved sigmask is in
		   its frame, and we can clear the TIF_RESTORE_SIGMASK flag */
		if (test_thread_flag(TIF_RESTORE_SIGMASK))
			clear_thread_flag(TIF_RESTORE_SIGMASK);
	}

	return ret;
}
OpenPOWER on IntegriCloud