summaryrefslogtreecommitdiffstats
path: root/arch/x86/ia32/sys_ia32.c
blob: beda4232ce695cc2f42aea28dea84dad02a38235 (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
/*
 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
 *             sys_sparc32
 *
 * Copyright (C) 2000		VA Linux Co
 * Copyright (C) 2000		Don Dugger <n0ano@valinux.com>
 * Copyright (C) 1999		Arun Sharma <arun.sharma@intel.com>
 * Copyright (C) 1997,1998	Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997		David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 2000		Hewlett-Packard Co.
 * Copyright (C) 2000		David Mosberger-Tang <davidm@hpl.hp.com>
 * Copyright (C) 2000,2001,2002	Andi Kleen, SuSE Labs (x86-64 port)
 *
 * These routines maintain argument size conversion between 32bit and 64bit
 * environment. In 2.5 most of this should be moved to a generic directory.
 *
 * This file assumes that there is a hole at the end of user address space.
 *
 * Some of the functions are LE specific currently. These are
 * hopefully all marked.  This should be fixed.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/smp_lock.h>
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/rwsem.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/highuid.h>
#include <linux/sysctl.h>
#include <asm/mman.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/ia32.h>
#include <asm/vgtod.h>

#define AA(__x)		((unsigned long)(__x))

int cp_compat_stat(struct kstat *kbuf, struct compat_stat __user *ubuf)
{
	compat_ino_t ino;

	typeof(ubuf->st_uid) uid = 0;
	typeof(ubuf->st_gid) gid = 0;
	SET_UID(uid, kbuf->uid);
	SET_GID(gid, kbuf->gid);
	if (!old_valid_dev(kbuf->dev) || !old_valid_dev(kbuf->rdev))
		return -EOVERFLOW;
	if (kbuf->size >= 0x7fffffff)
		return -EOVERFLOW;
	ino = kbuf->ino;
	if (sizeof(ino) < sizeof(kbuf->ino) && ino != kbuf->ino)
		return -EOVERFLOW;
	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct compat_stat)) ||
	    __put_user(old_encode_dev(kbuf->dev), &ubuf->st_dev) ||
	    __put_user(ino, &ubuf->st_ino) ||
	    __put_user(kbuf->mode, &ubuf->st_mode) ||
	    __put_user(kbuf->nlink, &ubuf->st_nlink) ||
	    __put_user(uid, &ubuf->st_uid) ||
	    __put_user(gid, &ubuf->st_gid) ||
	    __put_user(old_encode_dev(kbuf->rdev), &ubuf->st_rdev) ||
	    __put_user(kbuf->size, &ubuf->st_size) ||
	    __put_user(kbuf->atime.tv_sec, &ubuf->st_atime) ||
	    __put_user(kbuf->atime.tv_nsec, &ubuf->st_atime_nsec) ||
	    __put_user(kbuf->mtime.tv_sec, &ubuf->st_mtime) ||
	    __put_user(kbuf->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
	    __put_user(kbuf->ctime.tv_sec, &ubuf->st_ctime) ||
	    __put_user(kbuf->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
	    __put_user(kbuf->blksize, &ubuf->st_blksize) ||
	    __put_user(kbuf->blocks, &ubuf->st_blocks))
		return -EFAULT;
	return 0;
}

asmlinkage long sys32_truncate64(char __user *filename,
				 unsigned long offset_low,
				 unsigned long offset_high)
{
       return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
}

asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
				  unsigned long offset_high)
{
       return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
}

/*
 * Another set for IA32/LFS -- x86_64 struct stat is different due to
 * support for 64bit inode numbers.
 */
static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
{
	typeof(ubuf->st_uid) uid = 0;
	typeof(ubuf->st_gid) gid = 0;
	SET_UID(uid, stat->uid);
	SET_GID(gid, stat->gid);
	if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
	    __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
	    __put_user(stat->ino, &ubuf->__st_ino) ||
	    __put_user(stat->ino, &ubuf->st_ino) ||
	    __put_user(stat->mode, &ubuf->st_mode) ||
	    __put_user(stat->nlink, &ubuf->st_nlink) ||
	    __put_user(uid, &ubuf->st_uid) ||
	    __put_user(gid, &ubuf->st_gid) ||
	    __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
	    __put_user(stat->size, &ubuf->st_size) ||
	    __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
	    __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
	    __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
	    __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
	    __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
	    __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
	    __put_user(stat->blksize, &ubuf->st_blksize) ||
	    __put_user(stat->blocks, &ubuf->st_blocks))
		return -EFAULT;
	return 0;
}

asmlinkage long sys32_stat64(char __user *filename,
			     struct stat64 __user *statbuf)
{
	struct kstat stat;
	int ret = vfs_stat(filename, &stat);

	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

asmlinkage long sys32_lstat64(char __user *filename,
			      struct stat64 __user *statbuf)
{
	struct kstat stat;
	int ret = vfs_lstat(filename, &stat);
	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
{
	struct kstat stat;
	int ret = vfs_fstat(fd, &stat);
	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

asmlinkage long sys32_fstatat(unsigned int dfd, char __user *filename,
			      struct stat64 __user *statbuf, int flag)
{
	struct kstat stat;
	int error = -EINVAL;

	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
		goto out;

	if (flag & AT_SYMLINK_NOFOLLOW)
		error = vfs_lstat_fd(dfd, filename, &stat);
	else
		error = vfs_stat_fd(dfd, filename, &stat);

	if (!error)
		error = cp_stat64(statbuf, &stat);

out:
	return error;
}

/*
 * Linux/i386 didn't use to be able to handle more than
 * 4 system call parameters, so these system calls used a memory
 * block for parameter passing..
 */

struct mmap_arg_struct {
	unsigned int addr;
	unsigned int len;
	unsigned int prot;
	unsigned int flags;
	unsigned int fd;
	unsigned int offset;
};

asmlinkage long sys32_mmap(struct mmap_arg_struct __user *arg)
{
	struct mmap_arg_struct a;
	struct file *file = NULL;
	unsigned long retval;
	struct mm_struct *mm ;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;

	if (a.offset & ~PAGE_MASK)
		return -EINVAL;

	if (!(a.flags & MAP_ANONYMOUS)) {
		file = fget(a.fd);
		if (!file)
			return -EBADF;
	}

	mm = current->mm;
	down_write(&mm->mmap_sem);
	retval = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags,
			       a.offset>>PAGE_SHIFT);
	if (file)
		fput(file);

	up_write(&mm->mmap_sem);

	return retval;
}

asmlinkage long sys32_mprotect(unsigned long start, size_t len,
			       unsigned long prot)
{
	return sys_mprotect(start, len, prot);
}

asmlinkage long sys32_pipe(int __user *fd)
{
	int retval;
	int fds[2];

	retval = do_pipe_flags(fds, 0);
	if (retval)
		goto out;
	if (copy_to_user(fd, fds, sizeof(fds)))
		retval = -EFAULT;
out:
	return retval;
}

asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
				   struct sigaction32 __user *oact,
				   unsigned int sigsetsize)
{
	struct k_sigaction new_ka, old_ka;
	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) {
		compat_uptr_t handler, restorer;

		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(handler, &act->sa_handler) ||
		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
		    __get_user(restorer, &act->sa_restorer) ||
		    __copy_from_user(&set32, &act->sa_mask,
				     sizeof(compat_sigset_t)))
			return -EFAULT;
		new_ka.sa.sa_handler = compat_ptr(handler);
		new_ka.sa.sa_restorer = compat_ptr(restorer);

		/*
		 * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
		 * than _NSIG_WORDS << 1
		 */
		switch (_NSIG_WORDS) {
		case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
				| (((long)set32.sig[7]) << 32);
		case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
				| (((long)set32.sig[5]) << 32);
		case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
				| (((long)set32.sig[3]) << 32);
		case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
				| (((long)set32.sig[1]) << 32);
		}
	}

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

	if (!ret && oact) {
		/*
		 * FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
		 * than _NSIG_WORDS << 1
		 */
		switch (_NSIG_WORDS) {
		case 4:
			set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
			set32.sig[6] = old_ka.sa.sa_mask.sig[3];
		case 3:
			set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
			set32.sig[4] = old_ka.sa.sa_mask.sig[2];
		case 2:
			set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
			set32.sig[2] = old_ka.sa.sa_mask.sig[1];
		case 1:
			set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
			set32.sig[0] = old_ka.sa.sa_mask.sig[0];
		}
		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
		    __put_user(ptr_to_compat(old_ka.sa.sa_handler),
			       &oact->sa_handler) ||
		    __put_user(ptr_to_compat(old_ka.sa.sa_restorer),
			       &oact->sa_restorer) ||
		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
		    __copy_to_user(&oact->sa_mask, &set32,
				   sizeof(compat_sigset_t)))
			return -EFAULT;
	}

	return ret;
}

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

	if (act) {
		compat_old_sigset_t mask;
		compat_uptr_t handler, restorer;

		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
		    __get_user(handler, &act->sa_handler) ||
		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
		    __get_user(restorer, &act->sa_restorer) ||
		    __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);
	}

	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(ptr_to_compat(old_ka.sa.sa_handler),
			       &oact->sa_handler) ||
		    __put_user(ptr_to_compat(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;
}

asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
				     compat_sigset_t __user *oset,
				     unsigned int sigsetsize)
{
	sigset_t s;
	compat_sigset_t s32;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (set) {
		if (copy_from_user(&s32, set, sizeof(compat_sigset_t)))
			return -EFAULT;
		switch (_NSIG_WORDS) {
		case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
		case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
		case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
		case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
		}
	}
	set_fs(KERNEL_DS);
	ret = sys_rt_sigprocmask(how,
				 set ? (sigset_t __user *)&s : NULL,
				 oset ? (sigset_t __user *)&s : NULL,
				 sigsetsize);
	set_fs(old_fs);
	if (ret)
		return ret;
	if (oset) {
		switch (_NSIG_WORDS) {
		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
		}
		if (copy_to_user(oset, &s32, sizeof(compat_sigset_t)))
			return -EFAULT;
	}
	return 0;
}

static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
{
	int err = -EFAULT;

	if (access_ok(VERIFY_READ, i, sizeof(*i))) {
		err = __get_user(o->tv_sec, &i->tv_sec);
		err |= __get_user(o->tv_usec, &i->tv_usec);
	}
	return err;
}

static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
{
	int err = -EFAULT;

	if (access_ok(VERIFY_WRITE, o, sizeof(*o))) {
		err = __put_user(i->tv_sec, &o->tv_sec);
		err |= __put_user(i->tv_usec, &o->tv_usec);
	}
	return err;
}

asmlinkage long sys32_alarm(unsigned int seconds)
{
	return alarm_setitimer(seconds);
}

/*
 * Translations due to time_t size differences. Which affects all
 * sorts of things, like timeval and itimerval.
 */
asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv,
				   struct timezone __user *tz)
{
	if (tv) {
		struct timeval ktv;

		do_gettimeofday(&ktv);
		if (put_tv32(tv, &ktv))
			return -EFAULT;
	}
	if (tz) {
		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
			return -EFAULT;
	}
	return 0;
}

asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv,
				   struct timezone __user *tz)
{
	struct timeval ktv;
	struct timespec kts;
	struct timezone ktz;

	if (tv) {
		if (get_tv32(&ktv, tv))
			return -EFAULT;
		kts.tv_sec = ktv.tv_sec;
		kts.tv_nsec = ktv.tv_usec * NSEC_PER_USEC;
	}
	if (tz) {
		if (copy_from_user(&ktz, tz, sizeof(ktz)))
			return -EFAULT;
	}

	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

struct sel_arg_struct {
	unsigned int n;
	unsigned int inp;
	unsigned int outp;
	unsigned int exp;
	unsigned int tvp;
};

asmlinkage long sys32_old_select(struct sel_arg_struct __user *arg)
{
	struct sel_arg_struct a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
				 compat_ptr(a.exp), compat_ptr(a.tvp));
}

asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr,
			      int options)
{
	return compat_sys_wait4(pid, stat_addr, options, NULL);
}

/* 32-bit timeval and related flotsam.  */

asmlinkage long sys32_sysfs(int option, u32 arg1, u32 arg2)
{
	return sys_sysfs(option, arg1, arg2);
}

asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
				    struct compat_timespec __user *interval)
{
	struct timespec t;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
	set_fs(old_fs);
	if (put_compat_timespec(&t, interval))
		return -EFAULT;
	return ret;
}

asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
				    compat_size_t sigsetsize)
{
	sigset_t s;
	compat_sigset_t s32;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
	set_fs(old_fs);
	if (!ret) {
		switch (_NSIG_WORDS) {
		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
		}
		if (copy_to_user(set, &s32, sizeof(compat_sigset_t)))
			return -EFAULT;
	}
	return ret;
}

asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig,
				      compat_siginfo_t __user *uinfo)
{
	siginfo_t info;
	int ret;
	mm_segment_t old_fs = get_fs();

	if (copy_siginfo_from_user32(&info, uinfo))
		return -EFAULT;
	set_fs(KERNEL_DS);
	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
	set_fs(old_fs);
	return ret;
}

#ifdef CONFIG_SYSCTL_SYSCALL
struct sysctl_ia32 {
	unsigned int	name;
	int		nlen;
	unsigned int	oldval;
	unsigned int	oldlenp;
	unsigned int	newval;
	unsigned int	newlen;
	unsigned int	__unused[4];
};


asmlinkage long sys32_sysctl(struct sysctl_ia32 __user *args32)
{
	struct sysctl_ia32 a32;
	mm_segment_t old_fs = get_fs();
	void __user *oldvalp, *newvalp;
	size_t oldlen;
	int __user *namep;
	long ret;

	if (copy_from_user(&a32, args32, sizeof(a32)))
		return -EFAULT;

	/*
	 * We need to pre-validate these because we have to disable
	 * address checking before calling do_sysctl() because of
	 * OLDLEN but we can't run the risk of the user specifying bad
	 * addresses here.  Well, since we're dealing with 32 bit
	 * addresses, we KNOW that access_ok() will always succeed, so
	 * this is an expensive NOP, but so what...
	 */
	namep = compat_ptr(a32.name);
	oldvalp = compat_ptr(a32.oldval);
	newvalp =  compat_ptr(a32.newval);

	if ((oldvalp && get_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
	    || !access_ok(VERIFY_WRITE, namep, 0)
	    || !access_ok(VERIFY_WRITE, oldvalp, 0)
	    || !access_ok(VERIFY_WRITE, newvalp, 0))
		return -EFAULT;

	set_fs(KERNEL_DS);
	lock_kernel();
	ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *)&oldlen,
			newvalp, (size_t) a32.newlen);
	unlock_kernel();
	set_fs(old_fs);

	if (oldvalp && put_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
		return -EFAULT;

	return ret;
}
#endif

/* warning: next two assume little endian */
asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
			    u32 poslo, u32 poshi)
{
	return sys_pread64(fd, ubuf, count,
			 ((loff_t)AA(poshi) << 32) | AA(poslo));
}

asmlinkage long sys32_pwrite(unsigned int fd, char __user *ubuf, u32 count,
			     u32 poslo, u32 poshi)
{
	return sys_pwrite64(fd, ubuf, count,
			  ((loff_t)AA(poshi) << 32) | AA(poslo));
}


asmlinkage long sys32_personality(unsigned long personality)
{
	int ret;

	if (personality(current->personality) == PER_LINUX32 &&
		personality == PER_LINUX)
		personality = PER_LINUX32;
	ret = sys_personality(personality);
	if (ret == PER_LINUX32)
		ret = PER_LINUX;
	return ret;
}

asmlinkage long sys32_sendfile(int out_fd, int in_fd,
			       compat_off_t __user *offset, s32 count)
{
	mm_segment_t old_fs = get_fs();
	int ret;
	off_t of;

	if (offset && get_user(of, offset))
		return -EFAULT;

	set_fs(KERNEL_DS);
	ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
			   count);
	set_fs(old_fs);

	if (offset && put_user(of, offset))
		return -EFAULT;
	return ret;
}

asmlinkage long sys32_mmap2(unsigned long addr, unsigned long len,
			    unsigned long prot, unsigned long flags,
			    unsigned long fd, unsigned long pgoff)
{
	struct mm_struct *mm = current->mm;
	unsigned long error;
	struct file *file = NULL;

	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			return -EBADF;
	}

	down_write(&mm->mmap_sem);
	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
	up_write(&mm->mmap_sem);

	if (file)
		fput(file);
	return error;
}

asmlinkage long sys32_olduname(struct oldold_utsname __user *name)
{
	char *arch = "x86_64";
	int err;

	if (!name)
		return -EFAULT;
	if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
		return -EFAULT;

	down_read(&uts_sem);

	err = __copy_to_user(&name->sysname, &utsname()->sysname,
			     __OLD_UTS_LEN);
	err |= __put_user(0, name->sysname+__OLD_UTS_LEN);
	err |= __copy_to_user(&name->nodename, &utsname()->nodename,
			      __OLD_UTS_LEN);
	err |= __put_user(0, name->nodename+__OLD_UTS_LEN);
	err |= __copy_to_user(&name->release, &utsname()->release,
			      __OLD_UTS_LEN);
	err |= __put_user(0, name->release+__OLD_UTS_LEN);
	err |= __copy_to_user(&name->version, &utsname()->version,
			      __OLD_UTS_LEN);
	err |= __put_user(0, name->version+__OLD_UTS_LEN);

	if (personality(current->personality) == PER_LINUX32)
		arch = "i686";

	err |= __copy_to_user(&name->machine, arch, strlen(arch) + 1);

	up_read(&uts_sem);

	err = err ? -EFAULT : 0;

	return err;
}

long sys32_uname(struct old_utsname __user *name)
{
	int err;

	if (!name)
		return -EFAULT;
	down_read(&uts_sem);
	err = copy_to_user(name, utsname(), sizeof(*name));
	up_read(&uts_sem);
	if (personality(current->personality) == PER_LINUX32)
		err |= copy_to_user(&name->machine, "i686", 5);

	return err ? -EFAULT : 0;
}

long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
{
	struct ustat u;
	mm_segment_t seg;
	int ret;

	seg = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_ustat(dev, (struct ustat __user *)&u);
	set_fs(seg);
	if (ret < 0)
		return ret;

	if (!access_ok(VERIFY_WRITE, u32p, sizeof(struct ustat32)) ||
	    __put_user((__u32) u.f_tfree, &u32p->f_tfree) ||
	    __put_user((__u32) u.f_tinode, &u32p->f_tfree) ||
	    __copy_to_user(&u32p->f_fname, u.f_fname, sizeof(u.f_fname)) ||
	    __copy_to_user(&u32p->f_fpack, u.f_fpack, sizeof(u.f_fpack)))
		ret = -EFAULT;
	return ret;
}

asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
			     compat_uptr_t __user *envp, struct pt_regs *regs)
{
	long error;
	char *filename;

	filename = getname(name);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		return error;
	error = compat_do_execve(filename, argv, envp, regs);
	putname(filename);
	return error;
}

asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
			    struct pt_regs *regs)
{
	void __user *parent_tid = (void __user *)regs->dx;
	void __user *child_tid = (void __user *)regs->di;

	if (!newsp)
		newsp = regs->sp;
	return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}

/*
 * Some system calls that need sign extended arguments. This could be
 * done by a generic wrapper.
 */
long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
{
	return sys_lseek(fd, offset, whence);
}

long sys32_kill(int pid, int sig)
{
	return sys_kill(pid, sig);
}

long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
			__u32 len_low, __u32 len_high, int advice)
{
	return sys_fadvise64_64(fd,
			       (((u64)offset_high)<<32) | offset_low,
			       (((u64)len_high)<<32) | len_low,
				advice);
}

long sys32_vm86_warning(void)
{
	struct task_struct *me = current;
	static char lastcomm[sizeof(me->comm)];

	if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
		compat_printk(KERN_INFO
			      "%s: vm86 mode not supported on 64 bit kernel\n",
			      me->comm);
		strncpy(lastcomm, me->comm, sizeof(lastcomm));
	}
	return -ENOSYS;
}

long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
			  char __user *buf, size_t len)
{
	return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
}

asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
				   size_t count)
{
	return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
}

asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
				      unsigned n_low, unsigned n_hi,  int flags)
{
	return sys_sync_file_range(fd,
				   ((u64)off_hi << 32) | off_low,
				   ((u64)n_hi << 32) | n_low, flags);
}

asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
				size_t len, int advice)
{
	return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
				len, advice);
}

asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
				unsigned offset_hi, unsigned len_lo,
				unsigned len_hi)
{
	return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
			     ((u64)len_hi << 32) | len_lo);
}