/home/lenb/src/to-akpm branch 'acpi-2.6.12'
[linux-2.6] / arch / sparc64 / kernel / sys_sparc.c
1 /* $Id: sys_sparc.c,v 1.57 2002/02/09 19:49:30 davem Exp $
2  * linux/arch/sparc64/kernel/sys_sparc.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the Linux/sparc
6  * platform.
7  */
8
9 #include <linux/config.h>
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/sched.h>
13 #include <linux/fs.h>
14 #include <linux/file.h>
15 #include <linux/mm.h>
16 #include <linux/sem.h>
17 #include <linux/msg.h>
18 #include <linux/shm.h>
19 #include <linux/stat.h>
20 #include <linux/mman.h>
21 #include <linux/utsname.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/slab.h>
25 #include <linux/syscalls.h>
26 #include <linux/ipc.h>
27 #include <linux/personality.h>
28
29 #include <asm/uaccess.h>
30 #include <asm/ipc.h>
31 #include <asm/utrap.h>
32 #include <asm/perfctr.h>
33
34 /* #define DEBUG_UNIMP_SYSCALL */
35
36 /* XXX Make this per-binary type, this way we can detect the type of
37  * XXX a binary.  Every Sparc executable calls this very early on.
38  */
39 asmlinkage unsigned long sys_getpagesize(void)
40 {
41         return PAGE_SIZE;
42 }
43
44 #define COLOUR_ALIGN(addr,pgoff)                \
45         ((((addr)+SHMLBA-1)&~(SHMLBA-1)) +      \
46          (((pgoff)<<PAGE_SHIFT) & (SHMLBA-1)))
47
48 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
49 {
50         struct mm_struct *mm = current->mm;
51         struct vm_area_struct * vma;
52         unsigned long task_size = TASK_SIZE;
53         unsigned long start_addr;
54         int do_color_align;
55
56         if (flags & MAP_FIXED) {
57                 /* We do not accept a shared mapping if it would violate
58                  * cache aliasing constraints.
59                  */
60                 if ((flags & MAP_SHARED) &&
61                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
62                         return -EINVAL;
63                 return addr;
64         }
65
66         if (test_thread_flag(TIF_32BIT))
67                 task_size = 0xf0000000UL;
68         if (len > task_size || len > -PAGE_OFFSET)
69                 return -ENOMEM;
70
71         do_color_align = 0;
72         if (filp || (flags & MAP_SHARED))
73                 do_color_align = 1;
74
75         if (addr) {
76                 if (do_color_align)
77                         addr = COLOUR_ALIGN(addr, pgoff);
78                 else
79                         addr = PAGE_ALIGN(addr);
80
81                 vma = find_vma(mm, addr);
82                 if (task_size - len >= addr &&
83                     (!vma || addr + len <= vma->vm_start))
84                         return addr;
85         }
86
87         if (len <= mm->cached_hole_size) {
88                 mm->cached_hole_size = 0;
89                 mm->free_area_cache = TASK_UNMAPPED_BASE;
90         }
91         start_addr = addr = mm->free_area_cache;
92
93         task_size -= len;
94
95 full_search:
96         if (do_color_align)
97                 addr = COLOUR_ALIGN(addr, pgoff);
98         else
99                 addr = PAGE_ALIGN(addr);
100
101         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
102                 /* At this point:  (!vma || addr < vma->vm_end). */
103                 if (addr < PAGE_OFFSET && -PAGE_OFFSET - len < addr) {
104                         addr = PAGE_OFFSET;
105                         vma = find_vma(mm, PAGE_OFFSET);
106                 }
107                 if (task_size < addr) {
108                         if (start_addr != TASK_UNMAPPED_BASE) {
109                                 start_addr = addr = TASK_UNMAPPED_BASE;
110                                 mm->cached_hole_size = 0;
111                                 goto full_search;
112                         }
113                         return -ENOMEM;
114                 }
115                 if (!vma || addr + len <= vma->vm_start) {
116                         /*
117                          * Remember the place where we stopped the search:
118                          */
119                         mm->free_area_cache = addr + len;
120                         return addr;
121                 }
122                 if (addr + mm->cached_hole_size < vma->vm_start)
123                         mm->cached_hole_size = vma->vm_start - addr;
124
125                 addr = vma->vm_end;
126                 if (do_color_align)
127                         addr = COLOUR_ALIGN(addr, pgoff);
128         }
129 }
130
131 /* Try to align mapping such that we align it as much as possible. */
132 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
133 {
134         unsigned long align_goal, addr = -ENOMEM;
135
136         if (flags & MAP_FIXED) {
137                 /* Ok, don't mess with it. */
138                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
139         }
140         flags &= ~MAP_SHARED;
141
142         align_goal = PAGE_SIZE;
143         if (len >= (4UL * 1024 * 1024))
144                 align_goal = (4UL * 1024 * 1024);
145         else if (len >= (512UL * 1024))
146                 align_goal = (512UL * 1024);
147         else if (len >= (64UL * 1024))
148                 align_goal = (64UL * 1024);
149
150         do {
151                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
152                 if (!(addr & ~PAGE_MASK)) {
153                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
154                         break;
155                 }
156
157                 if (align_goal == (4UL * 1024 * 1024))
158                         align_goal = (512UL * 1024);
159                 else if (align_goal == (512UL * 1024))
160                         align_goal = (64UL * 1024);
161                 else
162                         align_goal = PAGE_SIZE;
163         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
164
165         /* Mapping is smaller than 64K or larger areas could not
166          * be obtained.
167          */
168         if (addr & ~PAGE_MASK)
169                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
170
171         return addr;
172 }
173
174 asmlinkage unsigned long sparc_brk(unsigned long brk)
175 {
176         /* People could try to be nasty and use ta 0x6d in 32bit programs */
177         if (test_thread_flag(TIF_32BIT) &&
178             brk >= 0xf0000000UL)
179                 return current->mm->brk;
180
181         if ((current->mm->brk & PAGE_OFFSET) != (brk & PAGE_OFFSET))
182                 return current->mm->brk;
183         return sys_brk(brk);
184 }
185                                                                 
186 /*
187  * sys_pipe() is the normal C calling standard for creating
188  * a pipe. It's not the way unix traditionally does this, though.
189  */
190 asmlinkage long sparc_pipe(struct pt_regs *regs)
191 {
192         int fd[2];
193         int error;
194
195         error = do_pipe(fd);
196         if (error)
197                 goto out;
198         regs->u_regs[UREG_I1] = fd[1];
199         error = fd[0];
200 out:
201         return error;
202 }
203
204 /*
205  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
206  *
207  * This is really horribly ugly.
208  */
209
210 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
211                         unsigned long third, void __user *ptr, long fifth)
212 {
213         int err;
214
215         /* No need for backward compatibility. We can start fresh... */
216         if (call <= SEMCTL) {
217                 switch (call) {
218                 case SEMOP:
219                         err = sys_semtimedop(first, ptr,
220                                              (unsigned)second, NULL);
221                         goto out;
222                 case SEMTIMEDOP:
223                         err = sys_semtimedop(first, ptr, (unsigned)second,
224                                 (const struct timespec __user *) fifth);
225                         goto out;
226                 case SEMGET:
227                         err = sys_semget(first, (int)second, (int)third);
228                         goto out;
229                 case SEMCTL: {
230                         union semun fourth;
231                         err = -EINVAL;
232                         if (!ptr)
233                                 goto out;
234                         err = -EFAULT;
235                         if (get_user(fourth.__pad,
236                                      (void __user * __user *) ptr))
237                                 goto out;
238                         err = sys_semctl(first, (int)second | IPC_64,
239                                          (int)third, fourth);
240                         goto out;
241                 }
242                 default:
243                         err = -ENOSYS;
244                         goto out;
245                 };
246         }
247         if (call <= MSGCTL) {
248                 switch (call) {
249                 case MSGSND:
250                         err = sys_msgsnd(first, ptr, (size_t)second,
251                                          (int)third);
252                         goto out;
253                 case MSGRCV:
254                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
255                                          (int)third);
256                         goto out;
257                 case MSGGET:
258                         err = sys_msgget((key_t)first, (int)second);
259                         goto out;
260                 case MSGCTL:
261                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
262                         goto out;
263                 default:
264                         err = -ENOSYS;
265                         goto out;
266                 };
267         }
268         if (call <= SHMCTL) {
269                 switch (call) {
270                 case SHMAT: {
271                         ulong raddr;
272                         err = do_shmat(first, ptr, (int)second, &raddr);
273                         if (!err) {
274                                 if (put_user(raddr,
275                                              (ulong __user *) third))
276                                         err = -EFAULT;
277                         }
278                         goto out;
279                 }
280                 case SHMDT:
281                         err = sys_shmdt(ptr);
282                         goto out;
283                 case SHMGET:
284                         err = sys_shmget(first, (size_t)second, (int)third);
285                         goto out;
286                 case SHMCTL:
287                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
288                         goto out;
289                 default:
290                         err = -ENOSYS;
291                         goto out;
292                 };
293         } else {
294                 err = -ENOSYS;
295         }
296 out:
297         return err;
298 }
299
300 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
301 {
302         int ret = sys_newuname(name);
303         
304         if (current->personality == PER_LINUX32 && !ret) {
305                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
306                        ? -EFAULT : 0);
307         }
308         return ret;
309 }
310
311 asmlinkage long sparc64_personality(unsigned long personality)
312 {
313         int ret;
314
315         if (current->personality == PER_LINUX32 &&
316             personality == PER_LINUX)
317                 personality = PER_LINUX32;
318         ret = sys_personality(personality);
319         if (ret == PER_LINUX32)
320                 ret = PER_LINUX;
321
322         return ret;
323 }
324
325 /* Linux version of mmap */
326 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
327         unsigned long prot, unsigned long flags, unsigned long fd,
328         unsigned long off)
329 {
330         struct file * file = NULL;
331         unsigned long retval = -EBADF;
332
333         if (!(flags & MAP_ANONYMOUS)) {
334                 file = fget(fd);
335                 if (!file)
336                         goto out;
337         }
338         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
339         len = PAGE_ALIGN(len);
340         retval = -EINVAL;
341
342         if (test_thread_flag(TIF_32BIT)) {
343                 if (len > 0xf0000000UL ||
344                     ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
345                         goto out_putf;
346         } else {
347                 if (len > -PAGE_OFFSET ||
348                     ((flags & MAP_FIXED) &&
349                      addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
350                         goto out_putf;
351         }
352
353         down_write(&current->mm->mmap_sem);
354         retval = do_mmap(file, addr, len, prot, flags, off);
355         up_write(&current->mm->mmap_sem);
356
357 out_putf:
358         if (file)
359                 fput(file);
360 out:
361         return retval;
362 }
363
364 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
365 {
366         long ret;
367
368         if (len > -PAGE_OFFSET ||
369             (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
370                 return -EINVAL;
371         down_write(&current->mm->mmap_sem);
372         ret = do_munmap(current->mm, addr, len);
373         up_write(&current->mm->mmap_sem);
374         return ret;
375 }
376
377 extern unsigned long do_mremap(unsigned long addr,
378         unsigned long old_len, unsigned long new_len,
379         unsigned long flags, unsigned long new_addr);
380                 
381 asmlinkage unsigned long sys64_mremap(unsigned long addr,
382         unsigned long old_len, unsigned long new_len,
383         unsigned long flags, unsigned long new_addr)
384 {
385         struct vm_area_struct *vma;
386         unsigned long ret = -EINVAL;
387         if (test_thread_flag(TIF_32BIT))
388                 goto out;
389         if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
390                 goto out;
391         if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
392                 goto out;
393         down_write(&current->mm->mmap_sem);
394         if (flags & MREMAP_FIXED) {
395                 if (new_addr < PAGE_OFFSET &&
396                     new_addr + new_len > -PAGE_OFFSET)
397                         goto out_sem;
398         } else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
399                 unsigned long map_flags = 0;
400                 struct file *file = NULL;
401
402                 ret = -ENOMEM;
403                 if (!(flags & MREMAP_MAYMOVE))
404                         goto out_sem;
405
406                 vma = find_vma(current->mm, addr);
407                 if (vma) {
408                         if (vma->vm_flags & VM_SHARED)
409                                 map_flags |= MAP_SHARED;
410                         file = vma->vm_file;
411                 }
412
413                 /* MREMAP_FIXED checked above. */
414                 new_addr = get_unmapped_area(file, addr, new_len,
415                                     vma ? vma->vm_pgoff : 0,
416                                     map_flags);
417                 ret = new_addr;
418                 if (new_addr & ~PAGE_MASK)
419                         goto out_sem;
420                 flags |= MREMAP_FIXED;
421         }
422         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
423 out_sem:
424         up_write(&current->mm->mmap_sem);
425 out:
426         return ret;       
427 }
428
429 /* we come to here via sys_nis_syscall so it can setup the regs argument */
430 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
431 {
432         static int count;
433         
434         /* Don't make the system unusable, if someone goes stuck */
435         if (count++ > 5)
436                 return -ENOSYS;
437
438         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
439 #ifdef DEBUG_UNIMP_SYSCALL      
440         show_regs (regs);
441 #endif
442
443         return -ENOSYS;
444 }
445
446 /* #define DEBUG_SPARC_BREAKPOINT */
447
448 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
449 {
450         siginfo_t info;
451
452         if (test_thread_flag(TIF_32BIT)) {
453                 regs->tpc &= 0xffffffff;
454                 regs->tnpc &= 0xffffffff;
455         }
456 #ifdef DEBUG_SPARC_BREAKPOINT
457         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
458 #endif
459         info.si_signo = SIGTRAP;
460         info.si_errno = 0;
461         info.si_code = TRAP_BRKPT;
462         info.si_addr = (void __user *)regs->tpc;
463         info.si_trapno = 0;
464         force_sig_info(SIGTRAP, &info, current);
465 #ifdef DEBUG_SPARC_BREAKPOINT
466         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
467 #endif
468 }
469
470 extern void check_pending(int signum);
471
472 asmlinkage long sys_getdomainname(char __user *name, int len)
473 {
474         int nlen;
475         int err = -EFAULT;
476
477         down_read(&uts_sem);
478         
479         nlen = strlen(system_utsname.domainname) + 1;
480
481         if (nlen < len)
482                 len = nlen;
483         if (len > __NEW_UTS_LEN)
484                 goto done;
485         if (copy_to_user(name, system_utsname.domainname, len))
486                 goto done;
487         err = 0;
488 done:
489         up_read(&uts_sem);
490         return err;
491 }
492
493 asmlinkage long solaris_syscall(struct pt_regs *regs)
494 {
495         static int count;
496
497         regs->tpc = regs->tnpc;
498         regs->tnpc += 4;
499         if (test_thread_flag(TIF_32BIT)) {
500                 regs->tpc &= 0xffffffff;
501                 regs->tnpc &= 0xffffffff;
502         }
503         if (++count <= 5) {
504                 printk ("For Solaris binary emulation you need solaris module loaded\n");
505                 show_regs (regs);
506         }
507         send_sig(SIGSEGV, current, 1);
508
509         return -ENOSYS;
510 }
511
512 #ifndef CONFIG_SUNOS_EMUL
513 asmlinkage long sunos_syscall(struct pt_regs *regs)
514 {
515         static int count;
516
517         regs->tpc = regs->tnpc;
518         regs->tnpc += 4;
519         if (test_thread_flag(TIF_32BIT)) {
520                 regs->tpc &= 0xffffffff;
521                 regs->tnpc &= 0xffffffff;
522         }
523         if (++count <= 20)
524                 printk ("SunOS binary emulation not compiled in\n");
525         force_sig(SIGSEGV, current);
526
527         return -ENOSYS;
528 }
529 #endif
530
531 asmlinkage long sys_utrap_install(utrap_entry_t type,
532                                   utrap_handler_t new_p,
533                                   utrap_handler_t new_d,
534                                   utrap_handler_t __user *old_p,
535                                   utrap_handler_t __user *old_d)
536 {
537         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
538                 return -EINVAL;
539         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
540                 if (old_p) {
541                         if (!current_thread_info()->utraps) {
542                                 if (put_user(NULL, old_p))
543                                         return -EFAULT;
544                         } else {
545                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
546                                         return -EFAULT;
547                         }
548                 }
549                 if (old_d) {
550                         if (put_user(NULL, old_d))
551                                 return -EFAULT;
552                 }
553                 return 0;
554         }
555         if (!current_thread_info()->utraps) {
556                 current_thread_info()->utraps =
557                         kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
558                 if (!current_thread_info()->utraps)
559                         return -ENOMEM;
560                 current_thread_info()->utraps[0] = 1;
561                 memset(current_thread_info()->utraps+1, 0,
562                        UT_TRAP_INSTRUCTION_31*sizeof(long));
563         } else {
564                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
565                     current_thread_info()->utraps[0] > 1) {
566                         long *p = current_thread_info()->utraps;
567
568                         current_thread_info()->utraps =
569                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
570                                         GFP_KERNEL);
571                         if (!current_thread_info()->utraps) {
572                                 current_thread_info()->utraps = p;
573                                 return -ENOMEM;
574                         }
575                         p[0]--;
576                         current_thread_info()->utraps[0] = 1;
577                         memcpy(current_thread_info()->utraps+1, p+1,
578                                UT_TRAP_INSTRUCTION_31*sizeof(long));
579                 }
580         }
581         if (old_p) {
582                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
583                         return -EFAULT;
584         }
585         if (old_d) {
586                 if (put_user(NULL, old_d))
587                         return -EFAULT;
588         }
589         current_thread_info()->utraps[type] = (long)new_p;
590
591         return 0;
592 }
593
594 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
595 {
596         if (model >= 3)
597                 return -EINVAL;
598         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
599         return 0;
600 }
601
602 asmlinkage long sys_rt_sigaction(int sig,
603                                  const struct sigaction __user *act,
604                                  struct sigaction __user *oact,
605                                  void __user *restorer,
606                                  size_t sigsetsize)
607 {
608         struct k_sigaction new_ka, old_ka;
609         int ret;
610
611         /* XXX: Don't preclude handling different sized sigset_t's.  */
612         if (sigsetsize != sizeof(sigset_t))
613                 return -EINVAL;
614
615         if (act) {
616                 new_ka.ka_restorer = restorer;
617                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
618                         return -EFAULT;
619         }
620
621         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
622
623         if (!ret && oact) {
624                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
625                         return -EFAULT;
626         }
627
628         return ret;
629 }
630
631 /* Invoked by rtrap code to update performance counters in
632  * user space.
633  */
634 asmlinkage void update_perfctrs(void)
635 {
636         unsigned long pic, tmp;
637
638         read_pic(pic);
639         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
640         __put_user(tmp, current_thread_info()->user_cntd0);
641         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
642         __put_user(tmp, current_thread_info()->user_cntd1);
643         reset_pic();
644 }
645
646 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
647 {
648         int err = 0;
649
650         switch(opcode) {
651         case PERFCTR_ON:
652                 current_thread_info()->pcr_reg = arg2;
653                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
654                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
655                 current_thread_info()->kernel_cntd0 =
656                         current_thread_info()->kernel_cntd1 = 0;
657                 write_pcr(arg2);
658                 reset_pic();
659                 set_thread_flag(TIF_PERFCTR);
660                 break;
661
662         case PERFCTR_OFF:
663                 err = -EINVAL;
664                 if (test_thread_flag(TIF_PERFCTR)) {
665                         current_thread_info()->user_cntd0 =
666                                 current_thread_info()->user_cntd1 = NULL;
667                         current_thread_info()->pcr_reg = 0;
668                         write_pcr(0);
669                         clear_thread_flag(TIF_PERFCTR);
670                         err = 0;
671                 }
672                 break;
673
674         case PERFCTR_READ: {
675                 unsigned long pic, tmp;
676
677                 if (!test_thread_flag(TIF_PERFCTR)) {
678                         err = -EINVAL;
679                         break;
680                 }
681                 read_pic(pic);
682                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
683                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
684                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
685                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
686                 reset_pic();
687                 break;
688         }
689
690         case PERFCTR_CLRPIC:
691                 if (!test_thread_flag(TIF_PERFCTR)) {
692                         err = -EINVAL;
693                         break;
694                 }
695                 current_thread_info()->kernel_cntd0 =
696                         current_thread_info()->kernel_cntd1 = 0;
697                 reset_pic();
698                 break;
699
700         case PERFCTR_SETPCR: {
701                 u64 __user *user_pcr = (u64 __user *)arg0;
702
703                 if (!test_thread_flag(TIF_PERFCTR)) {
704                         err = -EINVAL;
705                         break;
706                 }
707                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
708                 write_pcr(current_thread_info()->pcr_reg);
709                 current_thread_info()->kernel_cntd0 =
710                         current_thread_info()->kernel_cntd1 = 0;
711                 reset_pic();
712                 break;
713         }
714
715         case PERFCTR_GETPCR: {
716                 u64 __user *user_pcr = (u64 __user *)arg0;
717
718                 if (!test_thread_flag(TIF_PERFCTR)) {
719                         err = -EINVAL;
720                         break;
721                 }
722                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
723                 break;
724         }
725
726         default:
727                 err = -EINVAL;
728                 break;
729         };
730         return err;
731 }