Free Electrons

Embedded Linux Experts

  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
/*
 *  arch/s390/kernel/compat_signal.c
 *
 *    Copyright (C) IBM Corp. 2000,2006
 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
 *               Gerhard Tonn (ton@de.ibm.com)                  
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 */

#include <linux/compat.h>
#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/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/tty.h>
#include <linux/personality.h>
#include <linux/binfmts.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/lowcore.h>
#include "compat_linux.h"
#include "compat_ptrace.h"
#include "entry.h"

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

typedef struct 
{
	__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
	struct sigcontext32 sc;
	_sigregs32 sregs;
	int signo;
	__u32 gprs_high[NUM_GPRS];
	__u8 retcode[S390_SYSCALL_SIZE];
} sigframe32;

typedef struct 
{
	__u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
	__u8 retcode[S390_SYSCALL_SIZE];
	compat_siginfo_t info;
	struct ucontext32 uc;
	__u32 gprs_high[NUM_GPRS];
} rt_sigframe32;

int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
	int err;

	if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
		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(from->si_signo, &to->si_signo);
	err |= __put_user(from->si_errno, &to->si_errno);
	err |= __put_user((short)from->si_code, &to->si_code);
	if (from->si_code < 0)
		err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
		switch (from->si_code >> 16) {
		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
		case __SI_MESGQ >> 16:
			err |= __put_user(from->si_int, &to->si_int);
			/* fallthrough */
		case __SI_KILL >> 16:
			err |= __put_user(from->si_pid, &to->si_pid);
			err |= __put_user(from->si_uid, &to->si_uid);
			break;
		case __SI_CHLD >> 16:
			err |= __put_user(from->si_pid, &to->si_pid);
			err |= __put_user(from->si_uid, &to->si_uid);
			err |= __put_user(from->si_utime, &to->si_utime);
			err |= __put_user(from->si_stime, &to->si_stime);
			err |= __put_user(from->si_status, &to->si_status);
			break;
		case __SI_FAULT >> 16:
			err |= __put_user((unsigned long) from->si_addr,
					  &to->si_addr);
			break;
		case __SI_POLL >> 16:
			err |= __put_user(from->si_band, &to->si_band);
			err |= __put_user(from->si_fd, &to->si_fd);
			break;
		case __SI_TIMER >> 16:
			err |= __put_user(from->si_tid, &to->si_tid);
			err |= __put_user(from->si_overrun, &to->si_overrun);
			err |= __put_user(from->si_int, &to->si_int);
			break;
		default:
			break;
		}
	}
	return err;
}

int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
{
	int err;
	u32 tmp;

	if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
		return -EFAULT;

	err = __get_user(to->si_signo, &from->si_signo);
	err |= __get_user(to->si_errno, &from->si_errno);
	err |= __get_user(to->si_code, &from->si_code);

	if (to->si_code < 0)
		err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
	else {
		switch (to->si_code >> 16) {
		case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
		case __SI_MESGQ >> 16:
			err |= __get_user(to->si_int, &from->si_int);
			/* fallthrough */
		case __SI_KILL >> 16:
			err |= __get_user(to->si_pid, &from->si_pid);
			err |= __get_user(to->si_uid, &from->si_uid);
			break;
		case __SI_CHLD >> 16:
			err |= __get_user(to->si_pid, &from->si_pid);
			err |= __get_user(to->si_uid, &from->si_uid);
			err |= __get_user(to->si_utime, &from->si_utime);
			err |= __get_user(to->si_stime, &from->si_stime);
			err |= __get_user(to->si_status, &from->si_status);
			break;
		case __SI_FAULT >> 16:
			err |= __get_user(tmp, &from->si_addr);
			to->si_addr = (void __force __user *)
				(u64) (tmp & PSW32_ADDR_INSN);
			break;
		case __SI_POLL >> 16:
			err |= __get_user(to->si_band, &from->si_band);
			err |= __get_user(to->si_fd, &from->si_fd);
			break;
		case __SI_TIMER >> 16:
			err |= __get_user(to->si_tid, &from->si_tid);
			err |= __get_user(to->si_overrun, &from->si_overrun);
			err |= __get_user(to->si_int, &from->si_int);
			break;
		default:
			break;
		}
	}
	return err;
}

asmlinkage long
sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
		 struct old_sigaction32 __user *oact)
{
        struct k_sigaction new_ka, old_ka;
	unsigned long sa_handler, sa_restorer;
        int ret;

        if (act) {
		compat_old_sigset_t mask;
		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(sa_handler, &act->sa_handler) ||
		    __get_user(sa_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 = (__sighandler_t) sa_handler;
		new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
		siginitset(&new_ka.sa.sa_mask, mask);
        }

        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		sa_handler = (unsigned long) old_ka.sa.sa_handler;
		sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(sa_handler, &oact->sa_handler) ||
		    __put_user(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;
}

asmlinkage long
sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
	   struct sigaction32 __user *oact,  size_t sigsetsize)
{
	struct k_sigaction new_ka, old_ka;
	unsigned long sa_handler;
	int ret;
	compat_sigset_t set32;

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

	if (act) {
		ret = get_user(sa_handler, &act->sa_handler);
		ret |= __copy_from_user(&set32, &act->sa_mask,
					sizeof(compat_sigset_t));
		new_ka.sa.sa_mask.sig[0] =
			set32.sig[0] | (((long)set32.sig[1]) << 32);
		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
		
		if (ret)
			return -EFAULT;
		new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
	}

	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

	if (!ret && oact) {
		set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
		set32.sig[0] = old_ka.sa.sa_mask.sig[0];
		ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
		ret |= __copy_to_user(&oact->sa_mask, &set32,
				      sizeof(compat_sigset_t));
		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
	}

	return ret;
}

asmlinkage long
sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
{
	struct pt_regs *regs = task_pt_regs(current);
	stack_t kss, koss;
	unsigned long ss_sp;
	int ret, err = 0;
	mm_segment_t old_fs = get_fs();

	if (uss) {
		if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
			return -EFAULT;
		err |= __get_user(ss_sp, &uss->ss_sp);
		err |= __get_user(kss.ss_size, &uss->ss_size);
		err |= __get_user(kss.ss_flags, &uss->ss_flags);
		if (err)
			return -EFAULT;
		kss.ss_sp = (void __user *) ss_sp;
	}

	set_fs (KERNEL_DS);
	ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
			     (stack_t __force __user *) (uoss ? &koss : NULL),
			     regs->gprs[15]);
	set_fs (old_fs);

	if (!ret && uoss) {
		if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
			return -EFAULT;
		ss_sp = (unsigned long) koss.ss_sp;
		err |= __put_user(ss_sp, &uoss->ss_sp);
		err |= __put_user(koss.ss_size, &uoss->ss_size);
		err |= __put_user(koss.ss_flags, &uoss->ss_flags);
		if (err)
			return -EFAULT;
	}
	return ret;
}

static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
{
	_s390_regs_common32 regs32;
	int err, i;

	regs32.psw.mask = psw32_user_bits |
		((__u32)(regs->psw.mask >> 32) & PSW32_MASK_USER);
	regs32.psw.addr = (__u32) regs->psw.addr |
		(__u32)(regs->psw.mask & PSW_MASK_BA);
	for (i = 0; i < NUM_GPRS; i++)
		regs32.gprs[i] = (__u32) regs->gprs[i];
	save_access_regs(current->thread.acrs);
	memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
	err = __copy_to_user(&sregs->regs, &regs32, sizeof(regs32));
	if (err)
		return err;
	save_fp_regs(&current->thread.fp_regs);
	/* s390_fp_regs and _s390_fp_regs32 are the same ! */
	return __copy_to_user(&sregs->fpregs, &current->thread.fp_regs,
			      sizeof(_s390_fp_regs32));
}

static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
{
	_s390_regs_common32 regs32;
	int err, i;

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

	err = __copy_from_user(&regs32, &sregs->regs, sizeof(regs32));
	if (err)
		return err;
	regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
		(__u64)(regs32.psw.mask & PSW32_MASK_USER) << 32 |
		(__u64)(regs32.psw.addr & PSW32_ADDR_AMODE);
	regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
	for (i = 0; i < NUM_GPRS; i++)
		regs->gprs[i] = (__u64) regs32.gprs[i];
	memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
	restore_access_regs(current->thread.acrs);

	err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
			       sizeof(_s390_fp_regs32));
	current->thread.fp_regs.fpc &= FPC_VALID_MASK;
	if (err)
		return err;

	restore_fp_regs(&current->thread.fp_regs);
	clear_thread_flag(TIF_SYSCALL);	/* No longer in a system call */
	return 0;
}

static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
{
	__u32 gprs_high[NUM_GPRS];
	int i;

	for (i = 0; i < NUM_GPRS; i++)
		gprs_high[i] = regs->gprs[i] >> 32;

	return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
}

static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
{
	__u32 gprs_high[NUM_GPRS];
	int err, i;

	err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
	if (err)
		return err;
	for (i = 0; i < NUM_GPRS; i++)
		*(__u32 *)&regs->gprs[i] = gprs_high[i];
	return 0;
}

asmlinkage long sys32_sigreturn(void)
{
	struct pt_regs *regs = task_pt_regs(current);
	sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
	sigset_t set;

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
		goto badframe;
	sigdelsetmask(&set, ~_BLOCKABLE);
	set_current_blocked(&set);
	if (restore_sigregs32(regs, &frame->sregs))
		goto badframe;
	if (restore_sigregs_gprs_high(regs, frame->gprs_high))
		goto badframe;
	return regs->gprs[2];
badframe:
	force_sig(SIGSEGV, current);
	return 0;
}

asmlinkage long sys32_rt_sigreturn(void)
{
	struct pt_regs *regs = task_pt_regs(current);
	rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
	sigset_t set;
	stack_t st;
	__u32 ss_sp;
	int err;
	mm_segment_t old_fs = get_fs();

	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;
	sigdelsetmask(&set, ~_BLOCKABLE);
	set_current_blocked(&set);
	if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
		goto badframe;
	if (restore_sigregs_gprs_high(regs, frame->gprs_high))
		goto badframe;
	err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
	st.ss_sp = compat_ptr(ss_sp);
	err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
	err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
	if (err)
		goto badframe; 
	set_fs (KERNEL_DS);
	do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
	set_fs (old_fs);
	return regs->gprs[2];
badframe:
	force_sig(SIGSEGV, current);
	return 0;
}	

/*
 * Set up a signal frame.
 */


/*
 * Determine which stack to use..
 */
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
{
	unsigned long sp;

	/* Default to using normal stack */
	sp = (unsigned long) A(regs->gprs[15]);

	/* Overflow on alternate signal stack gives SIGSEGV. */
	if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
		return (void __user *) -1UL;

	/* This is the X/Open sanctioned signal stack switching.  */
	if (ka->sa.sa_flags & SA_ONSTACK) {
		if (! sas_ss_flags(sp))
			sp = current->sas_ss_sp + current->sas_ss_size;
	}

	/* This is the legacy signal stack switching. */
	else if (!user_mode(regs) &&
		 !(ka->sa.sa_flags & SA_RESTORER) &&
		 ka->sa.sa_restorer) {
		sp = (unsigned long) ka->sa.sa_restorer;
	}

	return (void __user *)((sp - frame_size) & -8ul);
}

static inline int map_signal(int sig)
{
	if (current_thread_info()->exec_domain
	    && current_thread_info()->exec_domain->signal_invmap
	    && sig < 32)
		return current_thread_info()->exec_domain->signal_invmap[sig];
        else
		return sig;
}

static int setup_frame32(int sig, struct k_sigaction *ka,
			sigset_t *set, struct pt_regs * regs)
{
	sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
	if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
		goto give_sigsegv;

	if (frame == (void __user *) -1UL)
		goto give_sigsegv;

	if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
		goto give_sigsegv;

	if (save_sigregs32(regs, &frame->sregs))
		goto give_sigsegv;
	if (save_sigregs_gprs_high(regs, frame->gprs_high))
		goto give_sigsegv;
	if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
		goto give_sigsegv;

	/* Set up to return from userspace.  If provided, use a stub
	   already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		regs->gprs[14] = (__u64) ka->sa.sa_restorer | PSW32_ADDR_AMODE;
	} else {
		regs->gprs[14] = (__u64) frame->retcode | PSW32_ADDR_AMODE;
		if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
			       (u16 __force __user *)(frame->retcode)))
			goto give_sigsegv;
        }

	/* Set up backchain. */
	if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->gprs[15] = (__force __u64) frame;
	regs->psw.mask |= PSW_MASK_BA;		/* force amode 31 */
	regs->psw.addr = (__force __u64) ka->sa.sa_handler;

	regs->gprs[2] = map_signal(sig);
	regs->gprs[3] = (__force __u64) &frame->sc;

	/* We forgot to include these in the sigcontext.
	   To avoid breaking binary compatibility, they are passed as args. */
	regs->gprs[4] = current->thread.trap_no;
	regs->gprs[5] = current->thread.prot_addr;

	/* Place signal number on stack to allow backtrace from handler.  */
	if (__put_user(regs->gprs[2], (int __force __user *) &frame->signo))
		goto give_sigsegv;
	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
			   sigset_t *set, struct pt_regs * regs)
{
	int err = 0;
	rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
	if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
		goto give_sigsegv;

	if (frame == (void __user *) -1UL)
		goto give_sigsegv;

	if (copy_siginfo_to_user32(&frame->info, info))
		goto give_sigsegv;

	/* Create the ucontext.  */
	err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
	err |= __put_user(0, &frame->uc.uc_link);
	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
	err |= __put_user(sas_ss_flags(regs->gprs[15]),
	                  &frame->uc.uc_stack.ss_flags);
	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
	err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
	err |= save_sigregs_gprs_high(regs, frame->gprs_high);
	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
	if (err)
		goto give_sigsegv;

	/* Set up to return from userspace.  If provided, use a stub
	   already in userspace.  */
	if (ka->sa.sa_flags & SA_RESTORER) {
		regs->gprs[14] = (__u64) ka->sa.sa_restorer;
	} else {
		regs->gprs[14] = (__u64) frame->retcode;
		err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
				  (u16 __force __user *)(frame->retcode));
	}

	/* Set up backchain. */
	if (__put_user(regs->gprs[15], (unsigned int __force __user *) frame))
		goto give_sigsegv;

	/* Set up registers for signal handler */
	regs->gprs[15] = (__force __u64) frame;
	regs->psw.mask |= PSW_MASK_BA;		/* force amode 31 */
	regs->psw.addr = (__u64) ka->sa.sa_handler;

	regs->gprs[2] = map_signal(sig);
	regs->gprs[3] = (__force __u64) &frame->info;
	regs->gprs[4] = (__force __u64) &frame->uc;
	return 0;

give_sigsegv:
	force_sigsegv(sig, current);
	return -EFAULT;
}

/*
 * OK, we're invoking a handler
 */	

int handle_signal32(unsigned long sig, struct k_sigaction *ka,
		    siginfo_t *info, sigset_t *oldset, struct pt_regs *regs)
{
	sigset_t blocked;
	int ret;

	/* Set up the stack frame */
	if (ka->sa.sa_flags & SA_SIGINFO)
		ret = setup_rt_frame32(sig, ka, info, oldset, regs);
	else
		ret = setup_frame32(sig, ka, oldset, regs);
	if (ret)
		return ret;
	sigorsets(&blocked, &current->blocked, &ka->sa.sa_mask);
	if (!(ka->sa.sa_flags & SA_NODEFER))
		sigaddset(&blocked, sig);
	set_current_blocked(&blocked);
	return 0;
}