Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / arch / sparc / kernel / sys_sparc_64.c
1 /* linux/arch/sparc64/kernel/sys_sparc.c
2  *
3  * This file contains various random system calls that
4  * have a non-standard calling sequence on the Linux/sparc
5  * platform.
6  */
7
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/sched.h>
11 #include <linux/fs.h>
12 #include <linux/file.h>
13 #include <linux/mm.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/mman.h>
19 #include <linux/utsname.h>
20 #include <linux/smp.h>
21 #include <linux/slab.h>
22 #include <linux/syscalls.h>
23 #include <linux/ipc.h>
24 #include <linux/personality.h>
25 #include <linux/random.h>
26 #include <linux/module.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/utrap.h>
30 #include <asm/perfctr.h>
31 #include <asm/unistd.h>
32
33 #include "entry.h"
34 #include "systbls.h"
35
36 /* #define DEBUG_UNIMP_SYSCALL */
37
38 asmlinkage unsigned long sys_getpagesize(void)
39 {
40         return PAGE_SIZE;
41 }
42
43 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
44 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
45
46 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
47  * overflow past the end of the 64-bit address space?
48  */
49 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
50 {
51         unsigned long va_exclude_start, va_exclude_end;
52
53         va_exclude_start = VA_EXCLUDE_START;
54         va_exclude_end   = VA_EXCLUDE_END;
55
56         if (unlikely(len >= va_exclude_start))
57                 return 1;
58
59         if (unlikely((addr + len) < addr))
60                 return 1;
61
62         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
63                      ((addr + len) >= va_exclude_start &&
64                       (addr + len) < va_exclude_end)))
65                 return 1;
66
67         return 0;
68 }
69
70 /* Does start,end straddle the VA-space hole?  */
71 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
72 {
73         unsigned long va_exclude_start, va_exclude_end;
74
75         va_exclude_start = VA_EXCLUDE_START;
76         va_exclude_end   = VA_EXCLUDE_END;
77
78         if (likely(start < va_exclude_start && end < va_exclude_start))
79                 return 0;
80
81         if (likely(start >= va_exclude_end && end >= va_exclude_end))
82                 return 0;
83
84         return 1;
85 }
86
87 /* These functions differ from the default implementations in
88  * mm/mmap.c in two ways:
89  *
90  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
91  *    for fixed such mappings we just validate what the user gave us.
92  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
93  *    the spitfire/niagara VA-hole.
94  */
95
96 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
97                                          unsigned long pgoff)
98 {
99         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
100         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
101
102         return base + off;
103 }
104
105 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
106                                               unsigned long pgoff)
107 {
108         unsigned long base = addr & ~(SHMLBA-1);
109         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
110
111         if (base + off <= addr)
112                 return base + off;
113         return base - off;
114 }
115
116 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
117 {
118         struct mm_struct *mm = current->mm;
119         struct vm_area_struct * vma;
120         unsigned long task_size = TASK_SIZE;
121         unsigned long start_addr;
122         int do_color_align;
123
124         if (flags & MAP_FIXED) {
125                 /* We do not accept a shared mapping if it would violate
126                  * cache aliasing constraints.
127                  */
128                 if ((flags & MAP_SHARED) &&
129                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
130                         return -EINVAL;
131                 return addr;
132         }
133
134         if (test_thread_flag(TIF_32BIT))
135                 task_size = STACK_TOP32;
136         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
137                 return -ENOMEM;
138
139         do_color_align = 0;
140         if (filp || (flags & MAP_SHARED))
141                 do_color_align = 1;
142
143         if (addr) {
144                 if (do_color_align)
145                         addr = COLOUR_ALIGN(addr, pgoff);
146                 else
147                         addr = PAGE_ALIGN(addr);
148
149                 vma = find_vma(mm, addr);
150                 if (task_size - len >= addr &&
151                     (!vma || addr + len <= vma->vm_start))
152                         return addr;
153         }
154
155         if (len > mm->cached_hole_size) {
156                 start_addr = addr = mm->free_area_cache;
157         } else {
158                 start_addr = addr = TASK_UNMAPPED_BASE;
159                 mm->cached_hole_size = 0;
160         }
161
162         task_size -= len;
163
164 full_search:
165         if (do_color_align)
166                 addr = COLOUR_ALIGN(addr, pgoff);
167         else
168                 addr = PAGE_ALIGN(addr);
169
170         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
171                 /* At this point:  (!vma || addr < vma->vm_end). */
172                 if (addr < VA_EXCLUDE_START &&
173                     (addr + len) >= VA_EXCLUDE_START) {
174                         addr = VA_EXCLUDE_END;
175                         vma = find_vma(mm, VA_EXCLUDE_END);
176                 }
177                 if (unlikely(task_size < addr)) {
178                         if (start_addr != TASK_UNMAPPED_BASE) {
179                                 start_addr = addr = TASK_UNMAPPED_BASE;
180                                 mm->cached_hole_size = 0;
181                                 goto full_search;
182                         }
183                         return -ENOMEM;
184                 }
185                 if (likely(!vma || addr + len <= vma->vm_start)) {
186                         /*
187                          * Remember the place where we stopped the search:
188                          */
189                         mm->free_area_cache = addr + len;
190                         return addr;
191                 }
192                 if (addr + mm->cached_hole_size < vma->vm_start)
193                         mm->cached_hole_size = vma->vm_start - addr;
194
195                 addr = vma->vm_end;
196                 if (do_color_align)
197                         addr = COLOUR_ALIGN(addr, pgoff);
198         }
199 }
200
201 unsigned long
202 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
203                           const unsigned long len, const unsigned long pgoff,
204                           const unsigned long flags)
205 {
206         struct vm_area_struct *vma;
207         struct mm_struct *mm = current->mm;
208         unsigned long task_size = STACK_TOP32;
209         unsigned long addr = addr0;
210         int do_color_align;
211
212         /* This should only ever run for 32-bit processes.  */
213         BUG_ON(!test_thread_flag(TIF_32BIT));
214
215         if (flags & MAP_FIXED) {
216                 /* We do not accept a shared mapping if it would violate
217                  * cache aliasing constraints.
218                  */
219                 if ((flags & MAP_SHARED) &&
220                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
221                         return -EINVAL;
222                 return addr;
223         }
224
225         if (unlikely(len > task_size))
226                 return -ENOMEM;
227
228         do_color_align = 0;
229         if (filp || (flags & MAP_SHARED))
230                 do_color_align = 1;
231
232         /* requesting a specific address */
233         if (addr) {
234                 if (do_color_align)
235                         addr = COLOUR_ALIGN(addr, pgoff);
236                 else
237                         addr = PAGE_ALIGN(addr);
238
239                 vma = find_vma(mm, addr);
240                 if (task_size - len >= addr &&
241                     (!vma || addr + len <= vma->vm_start))
242                         return addr;
243         }
244
245         /* check if free_area_cache is useful for us */
246         if (len <= mm->cached_hole_size) {
247                 mm->cached_hole_size = 0;
248                 mm->free_area_cache = mm->mmap_base;
249         }
250
251         /* either no address requested or can't fit in requested address hole */
252         addr = mm->free_area_cache;
253         if (do_color_align) {
254                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
255
256                 addr = base + len;
257         }
258
259         /* make sure it can fit in the remaining address space */
260         if (likely(addr > len)) {
261                 vma = find_vma(mm, addr-len);
262                 if (!vma || addr <= vma->vm_start) {
263                         /* remember the address as a hint for next time */
264                         return (mm->free_area_cache = addr-len);
265                 }
266         }
267
268         if (unlikely(mm->mmap_base < len))
269                 goto bottomup;
270
271         addr = mm->mmap_base-len;
272         if (do_color_align)
273                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
274
275         do {
276                 /*
277                  * Lookup failure means no vma is above this address,
278                  * else if new region fits below vma->vm_start,
279                  * return with success:
280                  */
281                 vma = find_vma(mm, addr);
282                 if (likely(!vma || addr+len <= vma->vm_start)) {
283                         /* remember the address as a hint for next time */
284                         return (mm->free_area_cache = addr);
285                 }
286
287                 /* remember the largest hole we saw so far */
288                 if (addr + mm->cached_hole_size < vma->vm_start)
289                         mm->cached_hole_size = vma->vm_start - addr;
290
291                 /* try just below the current vma->vm_start */
292                 addr = vma->vm_start-len;
293                 if (do_color_align)
294                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
295         } while (likely(len < vma->vm_start));
296
297 bottomup:
298         /*
299          * A failed mmap() very likely causes application failure,
300          * so fall back to the bottom-up function here. This scenario
301          * can happen with large stack limits and large mmap()
302          * allocations.
303          */
304         mm->cached_hole_size = ~0UL;
305         mm->free_area_cache = TASK_UNMAPPED_BASE;
306         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
307         /*
308          * Restore the topdown base:
309          */
310         mm->free_area_cache = mm->mmap_base;
311         mm->cached_hole_size = ~0UL;
312
313         return addr;
314 }
315
316 /* Try to align mapping such that we align it as much as possible. */
317 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
318 {
319         unsigned long align_goal, addr = -ENOMEM;
320
321         if (flags & MAP_FIXED) {
322                 /* Ok, don't mess with it. */
323                 return get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
324         }
325         flags &= ~MAP_SHARED;
326
327         align_goal = PAGE_SIZE;
328         if (len >= (4UL * 1024 * 1024))
329                 align_goal = (4UL * 1024 * 1024);
330         else if (len >= (512UL * 1024))
331                 align_goal = (512UL * 1024);
332         else if (len >= (64UL * 1024))
333                 align_goal = (64UL * 1024);
334
335         do {
336                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
337                 if (!(addr & ~PAGE_MASK)) {
338                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
339                         break;
340                 }
341
342                 if (align_goal == (4UL * 1024 * 1024))
343                         align_goal = (512UL * 1024);
344                 else if (align_goal == (512UL * 1024))
345                         align_goal = (64UL * 1024);
346                 else
347                         align_goal = PAGE_SIZE;
348         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
349
350         /* Mapping is smaller than 64K or larger areas could not
351          * be obtained.
352          */
353         if (addr & ~PAGE_MASK)
354                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
355
356         return addr;
357 }
358 EXPORT_SYMBOL(get_fb_unmapped_area);
359
360 /* Essentially the same as PowerPC... */
361 void arch_pick_mmap_layout(struct mm_struct *mm)
362 {
363         unsigned long random_factor = 0UL;
364
365         if (current->flags & PF_RANDOMIZE) {
366                 random_factor = get_random_int();
367                 if (test_thread_flag(TIF_32BIT))
368                         random_factor &= ((1 * 1024 * 1024) - 1);
369                 else
370                         random_factor = ((random_factor << PAGE_SHIFT) &
371                                          0xffffffffUL);
372         }
373
374         /*
375          * Fall back to the standard layout if the personality
376          * bit is set, or if the expected stack growth is unlimited:
377          */
378         if (!test_thread_flag(TIF_32BIT) ||
379             (current->personality & ADDR_COMPAT_LAYOUT) ||
380             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
381             sysctl_legacy_va_layout) {
382                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
383                 mm->get_unmapped_area = arch_get_unmapped_area;
384                 mm->unmap_area = arch_unmap_area;
385         } else {
386                 /* We know it's 32-bit */
387                 unsigned long task_size = STACK_TOP32;
388                 unsigned long gap;
389
390                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
391                 if (gap < 128 * 1024 * 1024)
392                         gap = 128 * 1024 * 1024;
393                 if (gap > (task_size / 6 * 5))
394                         gap = (task_size / 6 * 5);
395
396                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
397                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
398                 mm->unmap_area = arch_unmap_area_topdown;
399         }
400 }
401
402 SYSCALL_DEFINE1(sparc_brk, unsigned long, brk)
403 {
404         /* People could try to be nasty and use ta 0x6d in 32bit programs */
405         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
406                 return current->mm->brk;
407
408         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
409                 return current->mm->brk;
410
411         return sys_brk(brk);
412 }
413                                                                 
414 /*
415  * sys_pipe() is the normal C calling standard for creating
416  * a pipe. It's not the way unix traditionally does this, though.
417  */
418 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
419 {
420         int fd[2];
421         int error;
422
423         error = do_pipe_flags(fd, 0);
424         if (error)
425                 goto out;
426         regs->u_regs[UREG_I1] = fd[1];
427         error = fd[0];
428 out:
429         return error;
430 }
431
432 /*
433  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
434  *
435  * This is really horribly ugly.
436  */
437
438 SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
439                 unsigned long, third, void __user *, ptr, long, fifth)
440 {
441         long err;
442
443         /* No need for backward compatibility. We can start fresh... */
444         if (call <= SEMCTL) {
445                 switch (call) {
446                 case SEMOP:
447                         err = sys_semtimedop(first, ptr,
448                                              (unsigned)second, NULL);
449                         goto out;
450                 case SEMTIMEDOP:
451                         err = sys_semtimedop(first, ptr, (unsigned)second,
452                                 (const struct timespec __user *)
453                                              (unsigned long) fifth);
454                         goto out;
455                 case SEMGET:
456                         err = sys_semget(first, (int)second, (int)third);
457                         goto out;
458                 case SEMCTL: {
459                         err = sys_semctl(first, second,
460                                          (int)third | IPC_64,
461                                          (union semun) ptr);
462                         goto out;
463                 }
464                 default:
465                         err = -ENOSYS;
466                         goto out;
467                 };
468         }
469         if (call <= MSGCTL) {
470                 switch (call) {
471                 case MSGSND:
472                         err = sys_msgsnd(first, ptr, (size_t)second,
473                                          (int)third);
474                         goto out;
475                 case MSGRCV:
476                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
477                                          (int)third);
478                         goto out;
479                 case MSGGET:
480                         err = sys_msgget((key_t)first, (int)second);
481                         goto out;
482                 case MSGCTL:
483                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
484                         goto out;
485                 default:
486                         err = -ENOSYS;
487                         goto out;
488                 };
489         }
490         if (call <= SHMCTL) {
491                 switch (call) {
492                 case SHMAT: {
493                         ulong raddr;
494                         err = do_shmat(first, ptr, (int)second, &raddr);
495                         if (!err) {
496                                 if (put_user(raddr,
497                                              (ulong __user *) third))
498                                         err = -EFAULT;
499                         }
500                         goto out;
501                 }
502                 case SHMDT:
503                         err = sys_shmdt(ptr);
504                         goto out;
505                 case SHMGET:
506                         err = sys_shmget(first, (size_t)second, (int)third);
507                         goto out;
508                 case SHMCTL:
509                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
510                         goto out;
511                 default:
512                         err = -ENOSYS;
513                         goto out;
514                 };
515         } else {
516                 err = -ENOSYS;
517         }
518 out:
519         return err;
520 }
521
522 SYSCALL_DEFINE1(sparc64_newuname, struct new_utsname __user *, name)
523 {
524         int ret = sys_newuname(name);
525         
526         if (current->personality == PER_LINUX32 && !ret) {
527                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
528                        ? -EFAULT : 0);
529         }
530         return ret;
531 }
532
533 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
534 {
535         int ret;
536
537         if (current->personality == PER_LINUX32 &&
538             personality == PER_LINUX)
539                 personality = PER_LINUX32;
540         ret = sys_personality(personality);
541         if (ret == PER_LINUX32)
542                 ret = PER_LINUX;
543
544         return ret;
545 }
546
547 int sparc_mmap_check(unsigned long addr, unsigned long len)
548 {
549         if (test_thread_flag(TIF_32BIT)) {
550                 if (len >= STACK_TOP32)
551                         return -EINVAL;
552
553                 if (addr > STACK_TOP32 - len)
554                         return -EINVAL;
555         } else {
556                 if (len >= VA_EXCLUDE_START)
557                         return -EINVAL;
558
559                 if (invalid_64bit_range(addr, len))
560                         return -EINVAL;
561         }
562
563         return 0;
564 }
565
566 /* Linux version of mmap */
567 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
568                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
569                 unsigned long, off)
570 {
571         struct file * file = NULL;
572         unsigned long retval = -EBADF;
573
574         if (!(flags & MAP_ANONYMOUS)) {
575                 file = fget(fd);
576                 if (!file)
577                         goto out;
578         }
579         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
580         len = PAGE_ALIGN(len);
581
582         down_write(&current->mm->mmap_sem);
583         retval = do_mmap(file, addr, len, prot, flags, off);
584         up_write(&current->mm->mmap_sem);
585
586         if (file)
587                 fput(file);
588 out:
589         return retval;
590 }
591
592 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
593 {
594         long ret;
595
596         if (invalid_64bit_range(addr, len))
597                 return -EINVAL;
598
599         down_write(&current->mm->mmap_sem);
600         ret = do_munmap(current->mm, addr, len);
601         up_write(&current->mm->mmap_sem);
602         return ret;
603 }
604
605 extern unsigned long do_mremap(unsigned long addr,
606         unsigned long old_len, unsigned long new_len,
607         unsigned long flags, unsigned long new_addr);
608                 
609 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
610                 unsigned long, new_len, unsigned long, flags,
611                 unsigned long, new_addr)
612 {
613         unsigned long ret = -EINVAL;
614
615         if (test_thread_flag(TIF_32BIT))
616                 goto out;
617         if (unlikely(new_len >= VA_EXCLUDE_START))
618                 goto out;
619         if (unlikely(sparc_mmap_check(addr, old_len)))
620                 goto out;
621         if (unlikely(sparc_mmap_check(new_addr, new_len)))
622                 goto out;
623
624         down_write(&current->mm->mmap_sem);
625         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
626         up_write(&current->mm->mmap_sem);
627 out:
628         return ret;       
629 }
630
631 /* we come to here via sys_nis_syscall so it can setup the regs argument */
632 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
633 {
634         static int count;
635         
636         /* Don't make the system unusable, if someone goes stuck */
637         if (count++ > 5)
638                 return -ENOSYS;
639
640         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
641 #ifdef DEBUG_UNIMP_SYSCALL      
642         show_regs (regs);
643 #endif
644
645         return -ENOSYS;
646 }
647
648 /* #define DEBUG_SPARC_BREAKPOINT */
649
650 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
651 {
652         siginfo_t info;
653
654         if (test_thread_flag(TIF_32BIT)) {
655                 regs->tpc &= 0xffffffff;
656                 regs->tnpc &= 0xffffffff;
657         }
658 #ifdef DEBUG_SPARC_BREAKPOINT
659         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
660 #endif
661         info.si_signo = SIGTRAP;
662         info.si_errno = 0;
663         info.si_code = TRAP_BRKPT;
664         info.si_addr = (void __user *)regs->tpc;
665         info.si_trapno = 0;
666         force_sig_info(SIGTRAP, &info, current);
667 #ifdef DEBUG_SPARC_BREAKPOINT
668         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
669 #endif
670 }
671
672 extern void check_pending(int signum);
673
674 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
675 {
676         int nlen, err;
677
678         if (len < 0)
679                 return -EINVAL;
680
681         down_read(&uts_sem);
682         
683         nlen = strlen(utsname()->domainname) + 1;
684         err = -EINVAL;
685         if (nlen > len)
686                 goto out;
687
688         err = -EFAULT;
689         if (!copy_to_user(name, utsname()->domainname, nlen))
690                 err = 0;
691
692 out:
693         up_read(&uts_sem);
694         return err;
695 }
696
697 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
698                 utrap_handler_t, new_p, utrap_handler_t, new_d,
699                 utrap_handler_t __user *, old_p,
700                 utrap_handler_t __user *, old_d)
701 {
702         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
703                 return -EINVAL;
704         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
705                 if (old_p) {
706                         if (!current_thread_info()->utraps) {
707                                 if (put_user(NULL, old_p))
708                                         return -EFAULT;
709                         } else {
710                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
711                                         return -EFAULT;
712                         }
713                 }
714                 if (old_d) {
715                         if (put_user(NULL, old_d))
716                                 return -EFAULT;
717                 }
718                 return 0;
719         }
720         if (!current_thread_info()->utraps) {
721                 current_thread_info()->utraps =
722                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
723                 if (!current_thread_info()->utraps)
724                         return -ENOMEM;
725                 current_thread_info()->utraps[0] = 1;
726         } else {
727                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
728                     current_thread_info()->utraps[0] > 1) {
729                         unsigned long *p = current_thread_info()->utraps;
730
731                         current_thread_info()->utraps =
732                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
733                                         GFP_KERNEL);
734                         if (!current_thread_info()->utraps) {
735                                 current_thread_info()->utraps = p;
736                                 return -ENOMEM;
737                         }
738                         p[0]--;
739                         current_thread_info()->utraps[0] = 1;
740                         memcpy(current_thread_info()->utraps+1, p+1,
741                                UT_TRAP_INSTRUCTION_31*sizeof(long));
742                 }
743         }
744         if (old_p) {
745                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
746                         return -EFAULT;
747         }
748         if (old_d) {
749                 if (put_user(NULL, old_d))
750                         return -EFAULT;
751         }
752         current_thread_info()->utraps[type] = (long)new_p;
753
754         return 0;
755 }
756
757 asmlinkage long sparc_memory_ordering(unsigned long model,
758                                       struct pt_regs *regs)
759 {
760         if (model >= 3)
761                 return -EINVAL;
762         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
763         return 0;
764 }
765
766 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
767                 struct sigaction __user *, oact, void __user *, restorer,
768                 size_t, sigsetsize)
769 {
770         struct k_sigaction new_ka, old_ka;
771         int ret;
772
773         /* XXX: Don't preclude handling different sized sigset_t's.  */
774         if (sigsetsize != sizeof(sigset_t))
775                 return -EINVAL;
776
777         if (act) {
778                 new_ka.ka_restorer = restorer;
779                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
780                         return -EFAULT;
781         }
782
783         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
784
785         if (!ret && oact) {
786                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
787                         return -EFAULT;
788         }
789
790         return ret;
791 }
792
793 /* Invoked by rtrap code to update performance counters in
794  * user space.
795  */
796 asmlinkage void update_perfctrs(void)
797 {
798         unsigned long pic, tmp;
799
800         read_pic(pic);
801         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
802         __put_user(tmp, current_thread_info()->user_cntd0);
803         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
804         __put_user(tmp, current_thread_info()->user_cntd1);
805         reset_pic();
806 }
807
808 SYSCALL_DEFINE4(perfctr, int, opcode, unsigned long, arg0,
809                 unsigned long, arg1, unsigned long, arg2)
810 {
811         int err = 0;
812
813         switch(opcode) {
814         case PERFCTR_ON:
815                 current_thread_info()->pcr_reg = arg2;
816                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
817                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
818                 current_thread_info()->kernel_cntd0 =
819                         current_thread_info()->kernel_cntd1 = 0;
820                 write_pcr(arg2);
821                 reset_pic();
822                 set_thread_flag(TIF_PERFCTR);
823                 break;
824
825         case PERFCTR_OFF:
826                 err = -EINVAL;
827                 if (test_thread_flag(TIF_PERFCTR)) {
828                         current_thread_info()->user_cntd0 =
829                                 current_thread_info()->user_cntd1 = NULL;
830                         current_thread_info()->pcr_reg = 0;
831                         write_pcr(0);
832                         clear_thread_flag(TIF_PERFCTR);
833                         err = 0;
834                 }
835                 break;
836
837         case PERFCTR_READ: {
838                 unsigned long pic, tmp;
839
840                 if (!test_thread_flag(TIF_PERFCTR)) {
841                         err = -EINVAL;
842                         break;
843                 }
844                 read_pic(pic);
845                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
846                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
847                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
848                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
849                 reset_pic();
850                 break;
851         }
852
853         case PERFCTR_CLRPIC:
854                 if (!test_thread_flag(TIF_PERFCTR)) {
855                         err = -EINVAL;
856                         break;
857                 }
858                 current_thread_info()->kernel_cntd0 =
859                         current_thread_info()->kernel_cntd1 = 0;
860                 reset_pic();
861                 break;
862
863         case PERFCTR_SETPCR: {
864                 u64 __user *user_pcr = (u64 __user *)arg0;
865
866                 if (!test_thread_flag(TIF_PERFCTR)) {
867                         err = -EINVAL;
868                         break;
869                 }
870                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
871                 write_pcr(current_thread_info()->pcr_reg);
872                 current_thread_info()->kernel_cntd0 =
873                         current_thread_info()->kernel_cntd1 = 0;
874                 reset_pic();
875                 break;
876         }
877
878         case PERFCTR_GETPCR: {
879                 u64 __user *user_pcr = (u64 __user *)arg0;
880
881                 if (!test_thread_flag(TIF_PERFCTR)) {
882                         err = -EINVAL;
883                         break;
884                 }
885                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
886                 break;
887         }
888
889         default:
890                 err = -EINVAL;
891                 break;
892         };
893         return err;
894 }
895
896 /*
897  * Do a system call from kernel instead of calling sys_execve so we
898  * end up with proper pt_regs.
899  */
900 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
901 {
902         long __res;
903         register long __g1 __asm__ ("g1") = __NR_execve;
904         register long __o0 __asm__ ("o0") = (long)(filename);
905         register long __o1 __asm__ ("o1") = (long)(argv);
906         register long __o2 __asm__ ("o2") = (long)(envp);
907         asm volatile ("t 0x6d\n\t"
908                       "sub %%g0, %%o0, %0\n\t"
909                       "movcc %%xcc, %%o0, %0\n\t"
910                       : "=r" (__res), "=&r" (__o0)
911                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
912                       : "cc");
913         return __res;
914 }