summaryrefslogtreecommitdiff
path: root/arch/mips/kernel/irixsig.c
blob: 2132485caa744bbeddca7b4af11070b2e8c8591f (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
/*
 * irixsig.c: WHEEE, IRIX signals!  YOW, am I compatible or what?!?!
 *
 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
 * Copyright (C) 1997 - 2000 Ralf Baechle (ralf@gnu.org)
 * Copyright (C) 2000 Silicon Graphics, Inc.
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/time.h>
#include <linux/ptrace.h>
#include <linux/resource.h>

#include <asm/ptrace.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>

#undef DEBUG_SIG

#define _S(nr) (1<<((nr)-1))

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

typedef struct {
	unsigned long sig[4];
} irix_sigset_t;

struct sigctx_irix5 {
	u32 rmask, cp0_status;
	u64 pc;
	u64 regs[32];
	u64 fpregs[32];
	u32 usedfp, fpcsr, fpeir, sstk_flags;
	u64 hi, lo;
	u64 cp0_cause, cp0_badvaddr, _unused0;
	irix_sigset_t sigset;
	u64 weird_fpu_thing;
	u64 _unused1[31];
};

#ifdef DEBUG_SIG
/* Debugging */
static inline void dump_irix5_sigctx(struct sigctx_irix5 *c)
{
	int i;

	printk("misc: rmask[%08lx] status[%08lx] pc[%08lx]\n",
	       (unsigned long) c->rmask,
	       (unsigned long) c->cp0_status,
	       (unsigned long) c->pc);
	printk("regs: ");
	for(i = 0; i < 16; i++)
		printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
	printk("\nregs: ");
	for(i = 16; i < 32; i++)
		printk("[%d]<%08lx> ", i, (unsigned long) c->regs[i]);
	printk("\nfpregs: ");
	for(i = 0; i < 16; i++)
		printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
	printk("\nfpregs: ");
	for(i = 16; i < 32; i++)
		printk("[%d]<%08lx> ", i, (unsigned long) c->fpregs[i]);
	printk("misc: usedfp[%d] fpcsr[%08lx] fpeir[%08lx] stk_flgs[%08lx]\n",
	       (int) c->usedfp, (unsigned long) c->fpcsr,
	       (unsigned long) c->fpeir, (unsigned long) c->sstk_flags);
	printk("misc: hi[%08lx] lo[%08lx] cause[%08lx] badvaddr[%08lx]\n",
	       (unsigned long) c->hi, (unsigned long) c->lo,
	       (unsigned long) c->cp0_cause, (unsigned long) c->cp0_badvaddr);
	printk("misc: sigset<0>[%08lx] sigset<1>[%08lx] sigset<2>[%08lx] "
	       "sigset<3>[%08lx]\n", (unsigned long) c->sigset.sig[0],
	       (unsigned long) c->sigset.sig[1],
	       (unsigned long) c->sigset.sig[2],
	       (unsigned long) c->sigset.sig[3]);
}
#endif

static int setup_irix_frame(struct k_sigaction *ka, struct pt_regs *regs,
			    int signr, sigset_t *oldmask)
{
	struct sigctx_irix5 __user *ctx;
	unsigned long sp;
	int error, i;

	sp = regs->regs[29];
	sp -= sizeof(struct sigctx_irix5);
	sp &= ~(0xf);
	ctx = (struct sigctx_irix5 __user *) sp;
	if (!access_ok(VERIFY_WRITE, ctx, sizeof(*ctx)))
		goto segv_and_exit;

	error = __put_user(0, &ctx->weird_fpu_thing);
	error |= __put_user(~(0x00000001), &ctx->rmask);
	error |= __put_user(0, &ctx->regs[0]);
	for(i = 1; i < 32; i++)
		error |= __put_user((u64) regs->regs[i], &ctx->regs[i]);

	error |= __put_user((u64) regs->hi, &ctx->hi);
	error |= __put_user((u64) regs->lo, &ctx->lo);
	error |= __put_user((u64) regs->cp0_epc, &ctx->pc);
	error |= __put_user(!!used_math(), &ctx->usedfp);
	error |= __put_user((u64) regs->cp0_cause, &ctx->cp0_cause);
	error |= __put_user((u64) regs->cp0_badvaddr, &ctx->cp0_badvaddr);

	error |= __put_user(0, &ctx->sstk_flags); /* XXX sigstack unimp... todo... */

	error |= __copy_to_user(&ctx->sigset, oldmask, sizeof(irix_sigset_t)) ? -EFAULT : 0;

	if (error)
		goto segv_and_exit;

#ifdef DEBUG_SIG
	dump_irix5_sigctx(ctx);
#endif

	regs->regs[4] = (unsigned long) signr;
	regs->regs[5] = 0; /* XXX sigcode XXX */
	regs->regs[6] = regs->regs[29] = sp;
	regs->regs[7] = (unsigned long) ka->sa.sa_handler;
	regs->regs[25] = regs->cp0_epc = (unsigned long) ka->sa_restorer;

	return 1;

segv_and_exit:
	force_sigsegv(signr, current);
	return 0;
}

static int inline
setup_irix_rt_frame(struct k_sigaction * ka, struct pt_regs *regs,
               int signr, sigset_t *oldmask, siginfo_t *info)
{
	printk("Aiee: setup_tr_frame wants to be written");
	do_exit(SIGSEGV);
}

static inline int handle_signal(unsigned long sig, siginfo_t *info,
	struct k_sigaction *ka, sigset_t *oldset, struct pt_regs * regs)
{
	int ret;

	switch(regs->regs[0]) {
	case ERESTARTNOHAND:
		regs->regs[2] = EINTR;
		break;
	case ERESTARTSYS:
		if(!(ka->sa.sa_flags & SA_RESTART)) {
			regs->regs[2] = EINTR;
			break;
		}
	/* fallthrough */
	case ERESTARTNOINTR:		/* Userland will reload $v0.  */
		regs->cp0_epc -= 8;
	}

	regs->regs[0] = 0;		/* Don't deal with this again.  */

	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_irix_rt_frame(ka, regs, sig, oldset, info);
	else
		ret = setup_irix_frame(ka, regs, sig, oldset);

	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,sig);
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	return ret;
}

void do_irix_signal(struct pt_regs *regs)
{
	struct k_sigaction ka;
	siginfo_t info;
	int signr;
	sigset_t *oldset;

	/*
	 * We want the common case to go fast, which is why we may in certain
	 * cases get here from kernel mode. Just return without doing anything
	 * if so.
	 */
	if (!user_mode(regs))
		return;

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

	signr = get_signal_to_deliver(&info, &ka, regs, NULL);
	if (signr > 0) {
		/* Whee!  Actually deliver the signal.  */
		if (handle_signal(signr, &info, &ka, oldset, regs) == 0) {
			/* a signal was successfully delivered; the saved
			 * sigmask will have been stored in the signal frame,
			 * and will be restored by sigreturn, so we can simply
			 * clear the TIF_RESTORE_SIGMASK flag */
			if (test_thread_flag(TIF_RESTORE_SIGMASK))
				clear_thread_flag(TIF_RESTORE_SIGMASK);
		}

		return;
	}

	/*
	 * Who's code doesn't conform to the restartable syscall convention
	 * dies here!!!  The li instruction, a single machine instruction,
	 * must directly be followed by the syscall instruction.
	 */
	if (regs->regs[0]) {
		if (regs->regs[2] == ERESTARTNOHAND ||
		    regs->regs[2] == ERESTARTSYS ||
		    regs->regs[2] == ERESTARTNOINTR) {
			regs->cp0_epc -= 8;
		}
		if (regs->regs[2] == ERESTART_RESTARTBLOCK) {
			regs->regs[2] = __NR_restart_syscall;
			regs->regs[7] = regs->regs[26];
			regs->cp0_epc -= 4;
		}
		regs->regs[0] = 0;	/* Don't deal with this again.  */
	}

	/*
	* If there's no signal to deliver, we just 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);
	}
}

asmlinkage void
irix_sigreturn(struct pt_regs *regs)
{
	struct sigctx_irix5 __user *context, *magic;
	unsigned long umask, mask;
	u64 *fregs;
	u32 usedfp;
	int error, sig, i, base = 0;
	sigset_t blocked;

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

	if (regs->regs[2] == 1000)
		base = 1;

	context = (struct sigctx_irix5 __user *) regs->regs[base + 4];
	magic = (struct sigctx_irix5 __user *) regs->regs[base + 5];
	sig = (int) regs->regs[base + 6];
#ifdef DEBUG_SIG
	printk("[%s:%d] IRIX sigreturn(scp[%p],ucp[%p],sig[%d])\n",
	       current->comm, current->pid, context, magic, sig);
#endif
	if (!context)
		context = magic;
	if (!access_ok(VERIFY_READ, context, sizeof(struct sigctx_irix5)))
		goto badframe;

#ifdef DEBUG_SIG
	dump_irix5_sigctx(context);
#endif

	error = __get_user(regs->cp0_epc, &context->pc);
	error |= __get_user(umask, &context->rmask);

	mask = 2;
	for (i = 1; i < 32; i++, mask <<= 1) {
		if (umask & mask)
			error |= __get_user(regs->regs[i], &context->regs[i]);
	}
	error |= __get_user(regs->hi, &context->hi);
	error |= __get_user(regs->lo, &context->lo);

	error |= __get_user(usedfp, &context->usedfp);
	if ((umask & 1) && usedfp) {
		fregs = (u64 *) &current->thread.fpu;

		for(i = 0; i < 32; i++)
			error |= __get_user(fregs[i], &context->fpregs[i]);
		error |= __get_user(current->thread.fpu.fcr31, &context->fpcsr);
	}

	/* XXX do sigstack crapola here... XXX */

	error |= __copy_from_user(&blocked, &context->sigset, sizeof(blocked)) ? -EFAULT : 0;

	if (error)
		goto badframe;

	sigdelsetmask(&blocked, ~_BLOCKABLE);
	spin_lock_irq(&current->sighand->siglock);
	current->blocked = blocked;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
		"move\t$29,%0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
		/* Unreached */

badframe:
	force_sig(SIGSEGV, current);
}

struct sigact_irix5 {
	int flags;
	void (*handler)(int);
	u32 sigset[4];
	int _unused0[2];
};

#define SIG_SETMASK32	256	/* Goodie from SGI for BSD compatibility:
				   set only the low 32 bit of the sigset.  */

#ifdef DEBUG_SIG
static inline void dump_sigact_irix5(struct sigact_irix5 *p)
{
	printk("<f[%d] hndlr[%08lx] msk[%08lx]>", p->flags,
	       (unsigned long) p->handler,
	       (unsigned long) p->sigset[0]);
}
#endif

asmlinkage int
irix_sigaction(int sig, const struct sigaction __user *act,
	      struct sigaction __user *oact, void __user *trampoline)
{
	struct k_sigaction new_ka, old_ka;
	int ret;

#ifdef DEBUG_SIG
	printk(" (%d,%s,%s,%08lx) ", sig, (!new ? "0" : "NEW"),
	       (!old ? "0" : "OLD"), trampoline);
	if(new) {
		dump_sigact_irix5(new); printk(" ");
	}
#endif
	if (act) {
		sigset_t mask;
		int err;

		if (!access_ok(VERIFY_READ, act, sizeof(*act)))
			return -EFAULT;
		err = __get_user(new_ka.sa.sa_handler, &act->sa_handler);
		err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);

		err |= __copy_from_user(&mask, &act->sa_mask, sizeof(sigset_t)) ? -EFAULT : 0;
		if (err)
			return err;

		/*
		 * Hmmm... methinks IRIX libc always passes a valid trampoline
		 * value for all invocations of sigaction.  Will have to
		 * investigate.  POSIX POSIX, die die die...
		 */
		new_ka.sa_restorer = trampoline;
	}

/* XXX Implement SIG_SETMASK32 for IRIX compatibility */
	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		int err;

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

		err = __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
		err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
		err |= __copy_to_user(&oact->sa_mask, &old_ka.sa.sa_mask,
		               sizeof(sigset_t)) ? -EFAULT : 0;
		if (err)
			return -EFAULT;
	}

	return ret;
}

asmlinkage int irix_sigpending(irix_sigset_t __user *set)
{
	return do_sigpending(set, sizeof(*set));
}

asmlinkage int irix_sigprocmask(int how, irix_sigset_t __user *new,
	irix_sigset_t __user *old)
{
	sigset_t oldbits, newbits;

	if (new) {
		if (!access_ok(VERIFY_READ, new, sizeof(*new)))
			return -EFAULT;
		if (__copy_from_user(&newbits, new, sizeof(unsigned long)*4))
			return -EFAULT;
		sigdelsetmask(&newbits, ~_BLOCKABLE);

		spin_lock_irq(&current->sighand->siglock);
		oldbits = current->blocked;

		switch(how) {
		case 1:
			sigorsets(&newbits, &oldbits, &newbits);
			break;

		case 2:
			sigandsets(&newbits, &oldbits, &newbits);
			break;

		case 3:
			break;

		case 256:
			siginitset(&newbits, newbits.sig[0]);
			break;

		default:
			return -EINVAL;
		}
		recalc_sigpending();
		spin_unlock_irq(&current->sighand->siglock);
	}
	if (old)
		return copy_to_user(old, &current->blocked,
		                  sizeof(unsigned long)*4) ? -EFAULT : 0;

	return 0;
}

asmlinkage int irix_sigsuspend(struct pt_regs *regs)
{
	sigset_t newset;
	sigset_t __user *uset;

	uset = (sigset_t __user *) regs->regs[4];
	if (copy_from_user(&newset, uset, sizeof(sigset_t)))
		return -EFAULT;
	sigdelsetmask(&newset, ~_BLOCKABLE);

	spin_lock_irq(&current->sighand->siglock);
	current->saved_sigmask = current->blocked;
	current->blocked = newset;
	recalc_sigpending();
	spin_unlock_irq(&current->sighand->siglock);

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

/* hate hate hate... */
struct irix5_siginfo {
	int sig, code, error;
	union {
		char unused[128 - (3 * 4)]; /* Safety net. */
		struct {
			int pid;
			union {
				int uid;
				struct {
					int utime, status, stime;
				} child;
			} procdata;
		} procinfo;

		unsigned long fault_addr;

		struct {
			int fd;
			long band;
		} fileinfo;

		unsigned long sigval;
	} stuff;
};

asmlinkage int irix_sigpoll_sys(unsigned long __user *set,
	struct irix5_siginfo __user *info, struct timespec __user *tp)
{
	long expire = MAX_SCHEDULE_TIMEOUT;
	sigset_t kset;
	int i, sig, error, timeo = 0;
	struct timespec ktp;

#ifdef DEBUG_SIG
	printk("[%s:%d] irix_sigpoll_sys(%p,%p,%p)\n",
	       current->comm, current->pid, set, info, tp);
#endif

	/* Must always specify the signal set. */
	if (!set)
		return -EINVAL;

	if (copy_from_user(&kset, set, sizeof(set)))
		return -EFAULT;

	if (info && clear_user(info, sizeof(*info))) {
		error = -EFAULT;
		goto out;
	}

	if (tp) {
		if (copy_from_user(&ktp, tp, sizeof(*tp)))
			return -EFAULT;

		if (!ktp.tv_sec && !ktp.tv_nsec)
			return -EINVAL;

		expire = timespec_to_jiffies(&ktp) +
		         (ktp.tv_sec || ktp.tv_nsec);
	}

	while(1) {
		long tmp = 0;

		expire = schedule_timeout_interruptible(expire);

		for (i=0; i<=4; i++)
			tmp |= (current->pending.signal.sig[i] & kset.sig[i]);

		if (tmp)
			break;
		if (!expire) {
			timeo = 1;
			break;
		}
		if (signal_pending(current))
			return -EINTR;
	}
	if (timeo)
		return -EAGAIN;

	for (sig = 1; i <= 65 /* IRIX_NSIG */; sig++) {
		if (sigismember (&kset, sig))
			continue;
		if (sigismember (&current->pending.signal, sig)) {
			/* XXX need more than this... */
			if (info)
				return copy_to_user(&info->sig, &sig, sizeof(sig));
			return 0;
		}
	}

	/* Should not get here, but do something sane if we do. */
	error = -EINTR;

out:
	return error;
}

/* This is here because of irix5_siginfo definition. */
#define IRIX_P_PID    0
#define IRIX_P_PGID   2
#define IRIX_P_ALL    7

#define W_EXITED     1
#define W_TRAPPED    2
#define W_STOPPED    4
#define W_CONT       8
#define W_NOHANG    64

#define W_MASK      (W_EXITED | W_TRAPPED | W_STOPPED | W_CONT | W_NOHANG)

asmlinkage int irix_waitsys(int type, int pid,
	struct irix5_siginfo __user *info, int options,
	struct rusage __user *ru)
{
	int flag, retval;
	DECLARE_WAITQUEUE(wait, current);
	struct task_struct *tsk;
	struct task_struct *p;
	struct list_head *_p;

	if (!info)
		return -EINVAL;

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

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

	if (options & ~W_MASK)
		return -EINVAL;

	if (type != IRIX_P_PID && type != IRIX_P_PGID && type != IRIX_P_ALL)
		return -EINVAL;

	add_wait_queue(&current->signal->wait_chldexit, &wait);
repeat:
	flag = 0;
	current->state = TASK_INTERRUPTIBLE;
	read_lock(&tasklist_lock);
	tsk = current;
	list_for_each(_p,&tsk->children) {
		p = list_entry(_p,struct task_struct,sibling);
		if ((type == IRIX_P_PID) && p->pid != pid)
			continue;
		if ((type == IRIX_P_PGID) && process_group(p) != pid)
			continue;
		if ((p->exit_signal != SIGCHLD))
			continue;
		flag = 1;
		switch (p->state) {
		case TASK_STOPPED:
			if (!p->exit_code)
				continue;
			if (!(options & (W_TRAPPED|W_STOPPED)) &&
			    !(p->ptrace & PT_PTRACED))
				continue;
			read_unlock(&tasklist_lock);

			/* move to end of parent's list to avoid starvation */
			write_lock_irq(&tasklist_lock);
			remove_parent(p);
			add_parent(p);
			write_unlock_irq(&tasklist_lock);
			retval = ru ? getrusage(p, RUSAGE_BOTH, ru) : 0;
			if (retval)
				goto end_waitsys;

			retval = __put_user(SIGCHLD, &info->sig);
			retval |= __put_user(0, &info->code);
			retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
			retval |= __put_user((p->exit_code >> 8) & 0xff,
			           &info->stuff.procinfo.procdata.child.status);
			retval |= __put_user(p->utime, &info->stuff.procinfo.procdata.child.utime);
			retval |= __put_user(p->stime, &info->stuff.procinfo.procdata.child.stime);
			if (retval)
				goto end_waitsys;

			p->exit_code = 0;
			goto end_waitsys;

		case EXIT_ZOMBIE:
			current->signal->cutime += p->utime + p->signal->cutime;
			current->signal->cstime += p->stime + p->signal->cstime;
			if (ru != NULL)
				getrusage(p, RUSAGE_BOTH, ru);
			retval = __put_user(SIGCHLD, &info->sig);
			retval |= __put_user(1, &info->code);      /* CLD_EXITED */
			retval |= __put_user(p->pid, &info->stuff.procinfo.pid);
			retval |= __put_user((p->exit_code >> 8) & 0xff,
			           &info->stuff.procinfo.procdata.child.status);
			retval |= __put_user(p->utime,
			           &info->stuff.procinfo.procdata.child.utime);
			retval |= __put_user(p->stime,
			           &info->stuff.procinfo.procdata.child.stime);
			if (retval)
				return retval;

			if (p->real_parent != p->parent) {
				write_lock_irq(&tasklist_lock);
				remove_parent(p);
				p->parent = p->real_parent;
				add_parent(p);
				do_notify_parent(p, SIGCHLD);
				write_unlock_irq(&tasklist_lock);
			} else
				release_task(p);
			goto end_waitsys;
		default:
			continue;
		}
		tsk = next_thread(tsk);
	}
	read_unlock(&tasklist_lock);
	if (flag) {
		retval = 0;
		if (options & W_NOHANG)
			goto end_waitsys;
		retval = -ERESTARTSYS;
		if (signal_pending(current))
			goto end_waitsys;
		current->state = TASK_INTERRUPTIBLE;
		schedule();
		goto repeat;
	}
	retval = -ECHILD;
end_waitsys:
	current->state = TASK_RUNNING;
	remove_wait_queue(&current->signal->wait_chldexit, &wait);

	return retval;
}

struct irix5_context {
	u32 flags;
	u32 link;
	u32 sigmask[4];
	struct { u32 sp, size, flags; } stack;
	int regs[36];
	u32 fpregs[32];
	u32 fpcsr;
	u32 _unused0;
	u32 _unused1[47];
	u32 weird_graphics_thing;
};

asmlinkage int irix_getcontext(struct pt_regs *regs)
{
	int error, i, base = 0;
	struct irix5_context __user *ctx;
	unsigned long flags;

	if (regs->regs[2] == 1000)
		base = 1;
	ctx = (struct irix5_context __user *) regs->regs[base + 4];

#ifdef DEBUG_SIG
	printk("[%s:%d] irix_getcontext(%p)\n",
	       current->comm, current->pid, ctx);
#endif

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

	error = __put_user(current->thread.irix_oldctx, &ctx->link);

	error |= __copy_to_user(&ctx->sigmask, &current->blocked, sizeof(irix_sigset_t)) ? -EFAULT : 0;

	/* XXX Do sigstack stuff someday... */
	error |= __put_user(0, &ctx->stack.sp);
	error |= __put_user(0, &ctx->stack.size);
	error |= __put_user(0, &ctx->stack.flags);

	error |= __put_user(0, &ctx->weird_graphics_thing);
	error |= __put_user(0, &ctx->regs[0]);
	for (i = 1; i < 32; i++)
		error |= __put_user(regs->regs[i], &ctx->regs[i]);
	error |= __put_user(regs->lo, &ctx->regs[32]);
	error |= __put_user(regs->hi, &ctx->regs[33]);
	error |= __put_user(regs->cp0_cause, &ctx->regs[34]);
	error |= __put_user(regs->cp0_epc, &ctx->regs[35]);

	flags = 0x0f;
	if (!used_math()) {
		flags &= ~(0x08);
	} else {
		/* XXX wheee... */
		printk("Wheee, no code for saving IRIX FPU context yet.\n");
	}
	error |= __put_user(flags, &ctx->flags);

	return error;
}

asmlinkage void irix_setcontext(struct pt_regs *regs)
{
	struct irix5_context __user *ctx;
	int err, base = 0;
	u32 flags;

	if (regs->regs[2] == 1000)
		base = 1;
	ctx = (struct irix5_context __user *) regs->regs[base + 4];

#ifdef DEBUG_SIG
	printk("[%s:%d] irix_setcontext(%p)\n",
	       current->comm, current->pid, ctx);
#endif

	if (!access_ok(VERIFY_READ, ctx, sizeof(*ctx)))
		goto segv_and_exit;

	err = __get_user(flags, &ctx->flags);
	if (flags & 0x02) {
		/* XXX sigstack garbage, todo... */
		printk("Wheee, cannot do sigstack stuff in setcontext\n");
	}

	if (flags & 0x04) {
		int i;

		/* XXX extra control block stuff... todo... */
		for (i = 1; i < 32; i++)
			err |= __get_user(regs->regs[i], &ctx->regs[i]);
		err |= __get_user(regs->lo, &ctx->regs[32]);
		err |= __get_user(regs->hi, &ctx->regs[33]);
		err |= __get_user(regs->cp0_epc, &ctx->regs[35]);
	}

	if (flags & 0x08)
		/* XXX fpu context, blah... */
		printk(KERN_ERR "Wheee, cannot restore FPU context yet...\n");

	err |= __get_user(current->thread.irix_oldctx, &ctx->link);
	if (err)
		goto segv_and_exit;

	/*
	 * Don't let your children do this ...
	 */
	__asm__ __volatile__(
		"move\t$29,%0\n\t"
		"j\tsyscall_exit"
		:/* no outputs */
		:"r" (&regs));
		/* Unreached */

segv_and_exit:
	force_sigsegv(SIGSEGV, current);
}

struct irix_sigstack {
	unsigned long sp;
	int status;
};

asmlinkage int irix_sigstack(struct irix_sigstack __user *new,
	struct irix_sigstack __user *old)
{
#ifdef DEBUG_SIG
	printk("[%s:%d] irix_sigstack(%p,%p)\n",
	       current->comm, current->pid, new, old);
#endif
	if (new) {
		if (!access_ok(VERIFY_READ, new, sizeof(*new)))
			return -EFAULT;
	}

	if (old) {
		if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
			return -EFAULT;
	}

	return 0;
}

struct irix_sigaltstack { unsigned long sp; int size; int status; };

asmlinkage int irix_sigaltstack(struct irix_sigaltstack __user *new,
				struct irix_sigaltstack __user *old)
{
#ifdef DEBUG_SIG
	printk("[%s:%d] irix_sigaltstack(%p,%p)\n",
	       current->comm, current->pid, new, old);
#endif
	if (new)
		if (!access_ok(VERIFY_READ, new, sizeof(*new)))
			return -EFAULT;

	if (old) {
		if (!access_ok(VERIFY_WRITE, old, sizeof(*old)))
			return -EFAULT;
	}

	return 0;
}

struct irix_procset {
	int cmd, ltype, lid, rtype, rid;
};

asmlinkage int irix_sigsendset(struct irix_procset __user *pset, int sig)
{
	if (!access_ok(VERIFY_READ, pset, sizeof(*pset)))
		return -EFAULT;
#ifdef DEBUG_SIG
	printk("[%s:%d] irix_sigsendset([%d,%d,%d,%d,%d],%d)\n",
	       current->comm, current->pid,
	       pset->cmd, pset->ltype, pset->lid, pset->rtype, pset->rid,
	       sig);
#endif
	return -EINVAL;
}