summaryrefslogtreecommitdiffstats
path: root/arch/sparc64/kernel/sys_sparc.c
blob: 0077f02f4b374e34ced8a57e03490a6dd06c2165 (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
/* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $
 * linux/arch/sparc64/kernel/sys_sparc.c
 *
 * This file contains various random system calls that
 * have a non-standard calling sequence on the Linux/sparc
 * platform.
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/stat.h>
#include <linux/mman.h>
#include <linux/utsname.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/ipc.h>
#include <linux/personality.h>

#include <asm/uaccess.h>
#include <asm/ipc.h>
#include <asm/utrap.h>
#include <asm/perfctr.h>

/* #define DEBUG_UNIMP_SYSCALL */

/* XXX Make this per-binary type, this way we can detect the type of
 * XXX a binary.  Every Sparc executable calls this very early on.
 */
asmlinkage unsigned long sys_getpagesize(void)
{
	return PAGE_SIZE;
}

#define COLOUR_ALIGN(addr,pgoff)		\
	((((addr)+SHMLBA-1)&~(SHMLBA-1)) +	\
	 (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))

unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct * vma;
	unsigned long task_size = TASK_SIZE;
	unsigned long start_addr;
	int do_color_align;

	if (flags & MAP_FIXED) {
		/* We do not accept a shared mapping if it would violate
		 * cache aliasing constraints.
		 */
		if ((flags & MAP_SHARED) &&
		    ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
			return -EINVAL;
		return addr;
	}

	if (test_thread_flag(TIF_32BIT))
		task_size = 0xf0000000UL;
	if (len > task_size || len > -PAGE_OFFSET)
		return -ENOMEM;

	do_color_align = 0;
	if (filp || (flags & MAP_SHARED))
		do_color_align = 1;

	if (addr) {
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
		else
			addr = PAGE_ALIGN(addr);

		vma = find_vma(mm, addr);
		if (task_size - len >= addr &&
		    (!vma || addr + len <= vma->vm_start))
			return addr;
	}

	start_addr = addr = mm->free_area_cache;

	task_size -= len;

full_search:
	if (do_color_align)
		addr = COLOUR_ALIGN(addr, pgoff);
	else
		addr = PAGE_ALIGN(addr);

	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
		/* At this point:  (!vma || addr < vma->vm_end). */
		if (addr < PAGE_OFFSET && -PAGE_OFFSET - len < addr) {
			addr = PAGE_OFFSET;
			vma = find_vma(mm, PAGE_OFFSET);
		}
		if (task_size < addr) {
			if (start_addr != TASK_UNMAPPED_BASE) {
				start_addr = addr = TASK_UNMAPPED_BASE;
				goto full_search;
			}
			return -ENOMEM;
		}
		if (!vma || addr + len <= vma->vm_start) {
			/*
			 * Remember the place where we stopped the search:
			 */
			mm->free_area_cache = addr + len;
			return addr;
		}
		addr = vma->vm_end;
		if (do_color_align)
			addr = COLOUR_ALIGN(addr, pgoff);
	}
}

/* Try to align mapping such that we align it as much as possible. */
unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
	unsigned long align_goal, addr = -ENOMEM;

	if (flags & MAP_FIXED) {
		/* Ok, don't mess with it. */
		return get_unmapped_area(NULL, addr, len, pgoff, flags);
	}
	flags &= ~MAP_SHARED;

	align_goal = PAGE_SIZE;
	if (len >= (4UL * 1024 * 1024))
		align_goal = (4UL * 1024 * 1024);
	else if (len >= (512UL * 1024))
		align_goal = (512UL * 1024);
	else if (len >= (64UL * 1024))
		align_goal = (64UL * 1024);

	do {
		addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
		if (!(addr & ~PAGE_MASK)) {
			addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
			break;
		}

		if (align_goal == (4UL * 1024 * 1024))
			align_goal = (512UL * 1024);
		else if (align_goal == (512UL * 1024))
			align_goal = (64UL * 1024);
		else
			align_goal = PAGE_SIZE;
	} while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);

	/* Mapping is smaller than 64K or larger areas could not
	 * be obtained.
	 */
	if (addr & ~PAGE_MASK)
		addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);

	return addr;
}

asmlinkage unsigned long sparc_brk(unsigned long brk)
{
	/* People could try to be nasty and use ta 0x6d in 32bit programs */
	if (test_thread_flag(TIF_32BIT) &&
	    brk >= 0xf0000000UL)
		return current->mm->brk;

	if ((current->mm->brk & PAGE_OFFSET) != (brk & PAGE_OFFSET))
		return current->mm->brk;
	return sys_brk(brk);
}
                                                                
/*
 * sys_pipe() is the normal C calling standard for creating
 * a pipe. It's not the way unix traditionally does this, though.
 */
asmlinkage long sparc_pipe(struct pt_regs *regs)
{
	int fd[2];
	int error;

	error = do_pipe(fd);
	if (error)
		goto out;
	regs->u_regs[UREG_I1] = fd[1];
	error = fd[0];
out:
	return error;
}

/*
 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
 *
 * This is really horribly ugly.
 */

asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
			unsigned long third, void __user *ptr, long fifth)
{
	int err;

	/* No need for backward compatibility. We can start fresh... */
	if (call <= SEMCTL) {
		switch (call) {
		case SEMOP:
			err = sys_semtimedop(first, ptr,
					     (unsigned)second, NULL);
			goto out;
		case SEMTIMEDOP:
			err = sys_semtimedop(first, ptr, (unsigned)second,
				(const struct timespec __user *) fifth);
			goto out;
		case SEMGET:
			err = sys_semget(first, (int)second, (int)third);
			goto out;
		case SEMCTL: {
			union semun fourth;
			err = -EINVAL;
			if (!ptr)
				goto out;
			err = -EFAULT;
			if (get_user(fourth.__pad,
				     (void __user * __user *) ptr))
				goto out;
			err = sys_semctl(first, (int)second | IPC_64,
					 (int)third, fourth);
			goto out;
		}
		default:
			err = -ENOSYS;
			goto out;
		};
	}
	if (call <= MSGCTL) {
		switch (call) {
		case MSGSND:
			err = sys_msgsnd(first, ptr, (size_t)second,
					 (int)third);
			goto out;
		case MSGRCV:
			err = sys_msgrcv(first, ptr, (size_t)second, fifth,
					 (int)third);
			goto out;
		case MSGGET:
			err = sys_msgget((key_t)first, (int)second);
			goto out;
		case MSGCTL:
			err = sys_msgctl(first, (int)second | IPC_64, ptr);
			goto out;
		default:
			err = -ENOSYS;
			goto out;
		};
	}
	if (call <= SHMCTL) {
		switch (call) {
		case SHMAT: {
			ulong raddr;
			err = do_shmat(first, ptr, (int)second, &raddr);
			if (!err) {
				if (put_user(raddr,
					     (ulong __user *) third))
					err = -EFAULT;
			}
			goto out;
		}
		case SHMDT:
			err = sys_shmdt(ptr);
			goto out;
		case SHMGET:
			err = sys_shmget(first, (size_t)second, (int)third);
			goto out;
		case SHMCTL:
			err = sys_shmctl(first, (int)second | IPC_64, ptr);
			goto out;
		default:
			err = -ENOSYS;
			goto out;
		};
	} else {
		err = -ENOSYS;
	}
out:
	return err;
}

asmlinkage long sparc64_newuname(struct new_utsname __user *name)
{
	int ret = sys_newuname(name);
	
	if (current->personality == PER_LINUX32 && !ret) {
		ret = (copy_to_user(name->machine, "sparc\0\0", 8)
		       ? -EFAULT : 0);
	}
	return ret;
}

asmlinkage long sparc64_personality(unsigned long personality)
{
	int ret;

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

	return ret;
}

/* Linux version of mmap */
asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
	unsigned long prot, unsigned long flags, unsigned long fd,
	unsigned long off)
{
	struct file * file = NULL;
	unsigned long retval = -EBADF;

	if (!(flags & MAP_ANONYMOUS)) {
		file = fget(fd);
		if (!file)
			goto out;
	}
	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
	len = PAGE_ALIGN(len);
	retval = -EINVAL;

	if (test_thread_flag(TIF_32BIT)) {
		if (len > 0xf0000000UL ||
		    ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
			goto out_putf;
	} else {
		if (len > -PAGE_OFFSET ||
		    ((flags & MAP_FIXED) &&
		     addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
			goto out_putf;
	}

	down_write(&current->mm->mmap_sem);
	retval = do_mmap(file, addr, len, prot, flags, off);
	up_write(&current->mm->mmap_sem);

out_putf:
	if (file)
		fput(file);
out:
	return retval;
}

asmlinkage long sys64_munmap(unsigned long addr, size_t len)
{
	long ret;

	if (len > -PAGE_OFFSET ||
	    (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
		return -EINVAL;
	down_write(&current->mm->mmap_sem);
	ret = do_munmap(current->mm, addr, len);
	up_write(&current->mm->mmap_sem);
	return ret;
}

extern unsigned long do_mremap(unsigned long addr,
	unsigned long old_len, unsigned long new_len,
	unsigned long flags, unsigned long new_addr);
                
asmlinkage unsigned long sys64_mremap(unsigned long addr,
	unsigned long old_len, unsigned long new_len,
	unsigned long flags, unsigned long new_addr)
{
	struct vm_area_struct *vma;
	unsigned long ret = -EINVAL;
	if (test_thread_flag(TIF_32BIT))
		goto out;
	if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
		goto out;
	if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
		goto out;
	down_write(&current->mm->mmap_sem);
	if (flags & MREMAP_FIXED) {
		if (new_addr < PAGE_OFFSET &&
		    new_addr + new_len > -PAGE_OFFSET)
			goto out_sem;
	} else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
		unsigned long map_flags = 0;
		struct file *file = NULL;

		ret = -ENOMEM;
		if (!(flags & MREMAP_MAYMOVE))
			goto out_sem;

		vma = find_vma(current->mm, addr);
		if (vma) {
			if (vma->vm_flags & VM_SHARED)
				map_flags |= MAP_SHARED;
			file = vma->vm_file;
		}

		/* MREMAP_FIXED checked above. */
		new_addr = get_unmapped_area(file, addr, new_len,
				    vma ? vma->vm_pgoff : 0,
				    map_flags);
		ret = new_addr;
		if (new_addr & ~PAGE_MASK)
			goto out_sem;
		flags |= MREMAP_FIXED;
	}
	ret = do_mremap(addr, old_len, new_len, flags, new_addr);
out_sem:
	up_write(&current->mm->mmap_sem);
out:
	return ret;       
}

/* we come to here via sys_nis_syscall so it can setup the regs argument */
asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
{
	static int count;
	
	/* Don't make the system unusable, if someone goes stuck */
	if (count++ > 5)
		return -ENOSYS;

	printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
#ifdef DEBUG_UNIMP_SYSCALL	
	show_regs (regs);
#endif

	return -ENOSYS;
}

/* #define DEBUG_SPARC_BREAKPOINT */

asmlinkage void sparc_breakpoint(struct pt_regs *regs)
{
	siginfo_t info;

	if (test_thread_flag(TIF_32BIT)) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
#ifdef DEBUG_SPARC_BREAKPOINT
        printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
	info.si_signo = SIGTRAP;
	info.si_errno = 0;
	info.si_code = TRAP_BRKPT;
	info.si_addr = (void __user *)regs->tpc;
	info.si_trapno = 0;
	force_sig_info(SIGTRAP, &info, current);
#ifdef DEBUG_SPARC_BREAKPOINT
	printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
#endif
}

extern void check_pending(int signum);

asmlinkage long sys_getdomainname(char __user *name, int len)
{
        int nlen;
	int err = -EFAULT;

 	down_read(&uts_sem);
 	
	nlen = strlen(system_utsname.domainname) + 1;

        if (nlen < len)
                len = nlen;
	if (len > __NEW_UTS_LEN)
		goto done;
	if (copy_to_user(name, system_utsname.domainname, len))
		goto done;
	err = 0;
done:
	up_read(&uts_sem);
	return err;
}

asmlinkage long solaris_syscall(struct pt_regs *regs)
{
	static int count;

	regs->tpc = regs->tnpc;
	regs->tnpc += 4;
	if (test_thread_flag(TIF_32BIT)) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
	if (++count <= 5) {
		printk ("For Solaris binary emulation you need solaris module loaded\n");
		show_regs (regs);
	}
	send_sig(SIGSEGV, current, 1);

	return -ENOSYS;
}

#ifndef CONFIG_SUNOS_EMUL
asmlinkage long sunos_syscall(struct pt_regs *regs)
{
	static int count;

	regs->tpc = regs->tnpc;
	regs->tnpc += 4;
	if (test_thread_flag(TIF_32BIT)) {
		regs->tpc &= 0xffffffff;
		regs->tnpc &= 0xffffffff;
	}
	if (++count <= 20)
		printk ("SunOS binary emulation not compiled in\n");
	force_sig(SIGSEGV, current);

	return -ENOSYS;
}
#endif

asmlinkage long sys_utrap_install(utrap_entry_t type,
				  utrap_handler_t new_p,
				  utrap_handler_t new_d,
				  utrap_handler_t __user *old_p,
				  utrap_handler_t __user *old_d)
{
	if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
		return -EINVAL;
	if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
		if (old_p) {
			if (!current_thread_info()->utraps) {
				if (put_user(NULL, old_p))
					return -EFAULT;
			} else {
				if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
					return -EFAULT;
			}
		}
		if (old_d) {
			if (put_user(NULL, old_d))
				return -EFAULT;
		}
		return 0;
	}
	if (!current_thread_info()->utraps) {
		current_thread_info()->utraps =
			kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
		if (!current_thread_info()->utraps)
			return -ENOMEM;
		current_thread_info()->utraps[0] = 1;
		memset(current_thread_info()->utraps+1, 0,
		       UT_TRAP_INSTRUCTION_31*sizeof(long));
	} else {
		if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
		    current_thread_info()->utraps[0] > 1) {
			long *p = current_thread_info()->utraps;

			current_thread_info()->utraps =
				kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
					GFP_KERNEL);
			if (!current_thread_info()->utraps) {
				current_thread_info()->utraps = p;
				return -ENOMEM;
			}
			p[0]--;
			current_thread_info()->utraps[0] = 1;
			memcpy(current_thread_info()->utraps+1, p+1,
			       UT_TRAP_INSTRUCTION_31*sizeof(long));
		}
	}
	if (old_p) {
		if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
			return -EFAULT;
	}
	if (old_d) {
		if (put_user(NULL, old_d))
			return -EFAULT;
	}
	current_thread_info()->utraps[type] = (long)new_p;

	return 0;
}

long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
{
	if (model >= 3)
		return -EINVAL;
	regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
	return 0;
}

asmlinkage long sys_rt_sigaction(int sig,
				 const struct sigaction __user *act,
				 struct sigaction __user *oact,
				 void __user *restorer,
				 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(sigset_t))
		return -EINVAL;

	if (act) {
		new_ka.ka_restorer = restorer;
		if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
			return -EFAULT;
	}

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

	if (!ret && oact) {
		if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
			return -EFAULT;
	}

	return ret;
}

/* Invoked by rtrap code to update performance counters in
 * user space.
 */
asmlinkage void update_perfctrs(void)
{
	unsigned long pic, tmp;

	read_pic(pic);
	tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
	__put_user(tmp, current_thread_info()->user_cntd0);
	tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
	__put_user(tmp, current_thread_info()->user_cntd1);
	reset_pic();
}

asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
{
	int err = 0;

	switch(opcode) {
	case PERFCTR_ON:
		current_thread_info()->pcr_reg = arg2;
		current_thread_info()->user_cntd0 = (u64 __user *) arg0;
		current_thread_info()->user_cntd1 = (u64 __user *) arg1;
		current_thread_info()->kernel_cntd0 =
			current_thread_info()->kernel_cntd1 = 0;
		write_pcr(arg2);
		reset_pic();
		set_thread_flag(TIF_PERFCTR);
		break;

	case PERFCTR_OFF:
		err = -EINVAL;
		if (test_thread_flag(TIF_PERFCTR)) {
			current_thread_info()->user_cntd0 =
				current_thread_info()->user_cntd1 = NULL;
			current_thread_info()->pcr_reg = 0;
			write_pcr(0);
			clear_thread_flag(TIF_PERFCTR);
			err = 0;
		}
		break;

	case PERFCTR_READ: {
		unsigned long pic, tmp;

		if (!test_thread_flag(TIF_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		read_pic(pic);
		tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
		err |= __put_user(tmp, current_thread_info()->user_cntd0);
		tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
		err |= __put_user(tmp, current_thread_info()->user_cntd1);
		reset_pic();
		break;
	}

	case PERFCTR_CLRPIC:
		if (!test_thread_flag(TIF_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		current_thread_info()->kernel_cntd0 =
			current_thread_info()->kernel_cntd1 = 0;
		reset_pic();
		break;

	case PERFCTR_SETPCR: {
		u64 __user *user_pcr = (u64 __user *)arg0;

		if (!test_thread_flag(TIF_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
		write_pcr(current_thread_info()->pcr_reg);
		current_thread_info()->kernel_cntd0 =
			current_thread_info()->kernel_cntd1 = 0;
		reset_pic();
		break;
	}

	case PERFCTR_GETPCR: {
		u64 __user *user_pcr = (u64 __user *)arg0;

		if (!test_thread_flag(TIF_PERFCTR)) {
			err = -EINVAL;
			break;
		}
		err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
		break;
	}

	default:
		err = -EINVAL;
		break;
	};
	return err;
}