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[linux-2.6.git] / 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/errno.h>
10 #include <linux/types.h>
11 #include <linux/sched.h>
12 #include <linux/fs.h>
13 #include <linux/file.h>
14 #include <linux/mm.h>
15 #include <linux/sem.h>
16 #include <linux/msg.h>
17 #include <linux/shm.h>
18 #include <linux/stat.h>
19 #include <linux/mman.h>
20 #include <linux/utsname.h>
21 #include <linux/smp.h>
22 #include <linux/smp_lock.h>
23 #include <linux/slab.h>
24 #include <linux/syscalls.h>
25 #include <linux/ipc.h>
26 #include <linux/personality.h>
27 #include <linux/random.h>
28
29 #include <asm/uaccess.h>
30 #include <asm/ipc.h>
31 #include <asm/utrap.h>
32 #include <asm/perfctr.h>
33 #include <asm/a.out.h>
34
35 /* #define DEBUG_UNIMP_SYSCALL */
36
37 asmlinkage unsigned long sys_getpagesize(void)
38 {
39         return PAGE_SIZE;
40 }
41
42 #define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
43 #define VA_EXCLUDE_END   (0xfffff80000000000UL + (1UL << 32UL))
44
45 /* Does addr --> addr+len fall within 4GB of the VA-space hole or
46  * overflow past the end of the 64-bit address space?
47  */
48 static inline int invalid_64bit_range(unsigned long addr, unsigned long len)
49 {
50         unsigned long va_exclude_start, va_exclude_end;
51
52         va_exclude_start = VA_EXCLUDE_START;
53         va_exclude_end   = VA_EXCLUDE_END;
54
55         if (unlikely(len >= va_exclude_start))
56                 return 1;
57
58         if (unlikely((addr + len) < addr))
59                 return 1;
60
61         if (unlikely((addr >= va_exclude_start && addr < va_exclude_end) ||
62                      ((addr + len) >= va_exclude_start &&
63                       (addr + len) < va_exclude_end)))
64                 return 1;
65
66         return 0;
67 }
68
69 /* Does start,end straddle the VA-space hole?  */
70 static inline int straddles_64bit_va_hole(unsigned long start, unsigned long end)
71 {
72         unsigned long va_exclude_start, va_exclude_end;
73
74         va_exclude_start = VA_EXCLUDE_START;
75         va_exclude_end   = VA_EXCLUDE_END;
76
77         if (likely(start < va_exclude_start && end < va_exclude_start))
78                 return 0;
79
80         if (likely(start >= va_exclude_end && end >= va_exclude_end))
81                 return 0;
82
83         return 1;
84 }
85
86 /* These functions differ from the default implementations in
87  * mm/mmap.c in two ways:
88  *
89  * 1) For file backed MAP_SHARED mmap()'s we D-cache color align,
90  *    for fixed such mappings we just validate what the user gave us.
91  * 2) For 64-bit tasks we avoid mapping anything within 4GB of
92  *    the spitfire/niagara VA-hole.
93  */
94
95 static inline unsigned long COLOUR_ALIGN(unsigned long addr,
96                                          unsigned long pgoff)
97 {
98         unsigned long base = (addr+SHMLBA-1)&~(SHMLBA-1);
99         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
100
101         return base + off;
102 }
103
104 static inline unsigned long COLOUR_ALIGN_DOWN(unsigned long addr,
105                                               unsigned long pgoff)
106 {
107         unsigned long base = addr & ~(SHMLBA-1);
108         unsigned long off = (pgoff<<PAGE_SHIFT) & (SHMLBA-1);
109
110         if (base + off <= addr)
111                 return base + off;
112         return base - off;
113 }
114
115 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
116 {
117         struct mm_struct *mm = current->mm;
118         struct vm_area_struct * vma;
119         unsigned long task_size = TASK_SIZE;
120         unsigned long start_addr;
121         int do_color_align;
122
123         if (flags & MAP_FIXED) {
124                 /* We do not accept a shared mapping if it would violate
125                  * cache aliasing constraints.
126                  */
127                 if ((flags & MAP_SHARED) &&
128                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
129                         return -EINVAL;
130                 return addr;
131         }
132
133         if (test_thread_flag(TIF_32BIT))
134                 task_size = STACK_TOP32;
135         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
136                 return -ENOMEM;
137
138         do_color_align = 0;
139         if (filp || (flags & MAP_SHARED))
140                 do_color_align = 1;
141
142         if (addr) {
143                 if (do_color_align)
144                         addr = COLOUR_ALIGN(addr, pgoff);
145                 else
146                         addr = PAGE_ALIGN(addr);
147
148                 vma = find_vma(mm, addr);
149                 if (task_size - len >= addr &&
150                     (!vma || addr + len <= vma->vm_start))
151                         return addr;
152         }
153
154         if (len > mm->cached_hole_size) {
155                 start_addr = addr = mm->free_area_cache;
156         } else {
157                 start_addr = addr = TASK_UNMAPPED_BASE;
158                 mm->cached_hole_size = 0;
159         }
160
161         task_size -= len;
162
163 full_search:
164         if (do_color_align)
165                 addr = COLOUR_ALIGN(addr, pgoff);
166         else
167                 addr = PAGE_ALIGN(addr);
168
169         for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
170                 /* At this point:  (!vma || addr < vma->vm_end). */
171                 if (addr < VA_EXCLUDE_START &&
172                     (addr + len) >= VA_EXCLUDE_START) {
173                         addr = VA_EXCLUDE_END;
174                         vma = find_vma(mm, VA_EXCLUDE_END);
175                 }
176                 if (unlikely(task_size < addr)) {
177                         if (start_addr != TASK_UNMAPPED_BASE) {
178                                 start_addr = addr = TASK_UNMAPPED_BASE;
179                                 mm->cached_hole_size = 0;
180                                 goto full_search;
181                         }
182                         return -ENOMEM;
183                 }
184                 if (likely(!vma || addr + len <= vma->vm_start)) {
185                         /*
186                          * Remember the place where we stopped the search:
187                          */
188                         mm->free_area_cache = addr + len;
189                         return addr;
190                 }
191                 if (addr + mm->cached_hole_size < vma->vm_start)
192                         mm->cached_hole_size = vma->vm_start - addr;
193
194                 addr = vma->vm_end;
195                 if (do_color_align)
196                         addr = COLOUR_ALIGN(addr, pgoff);
197         }
198 }
199
200 unsigned long
201 arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
202                           const unsigned long len, const unsigned long pgoff,
203                           const unsigned long flags)
204 {
205         struct vm_area_struct *vma;
206         struct mm_struct *mm = current->mm;
207         unsigned long task_size = STACK_TOP32;
208         unsigned long addr = addr0;
209         int do_color_align;
210
211         /* This should only ever run for 32-bit processes.  */
212         BUG_ON(!test_thread_flag(TIF_32BIT));
213
214         if (flags & MAP_FIXED) {
215                 /* We do not accept a shared mapping if it would violate
216                  * cache aliasing constraints.
217                  */
218                 if ((flags & MAP_SHARED) &&
219                     ((addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1)))
220                         return -EINVAL;
221                 return addr;
222         }
223
224         if (unlikely(len > task_size))
225                 return -ENOMEM;
226
227         do_color_align = 0;
228         if (filp || (flags & MAP_SHARED))
229                 do_color_align = 1;
230
231         /* requesting a specific address */
232         if (addr) {
233                 if (do_color_align)
234                         addr = COLOUR_ALIGN(addr, pgoff);
235                 else
236                         addr = PAGE_ALIGN(addr);
237
238                 vma = find_vma(mm, addr);
239                 if (task_size - len >= addr &&
240                     (!vma || addr + len <= vma->vm_start))
241                         return addr;
242         }
243
244         /* check if free_area_cache is useful for us */
245         if (len <= mm->cached_hole_size) {
246                 mm->cached_hole_size = 0;
247                 mm->free_area_cache = mm->mmap_base;
248         }
249
250         /* either no address requested or can't fit in requested address hole */
251         addr = mm->free_area_cache;
252         if (do_color_align) {
253                 unsigned long base = COLOUR_ALIGN_DOWN(addr-len, pgoff);
254
255                 addr = base + len;
256         }
257
258         /* make sure it can fit in the remaining address space */
259         if (likely(addr > len)) {
260                 vma = find_vma(mm, addr-len);
261                 if (!vma || addr <= vma->vm_start) {
262                         /* remember the address as a hint for next time */
263                         return (mm->free_area_cache = addr-len);
264                 }
265         }
266
267         if (unlikely(mm->mmap_base < len))
268                 goto bottomup;
269
270         addr = mm->mmap_base-len;
271         if (do_color_align)
272                 addr = COLOUR_ALIGN_DOWN(addr, pgoff);
273
274         do {
275                 /*
276                  * Lookup failure means no vma is above this address,
277                  * else if new region fits below vma->vm_start,
278                  * return with success:
279                  */
280                 vma = find_vma(mm, addr);
281                 if (likely(!vma || addr+len <= vma->vm_start)) {
282                         /* remember the address as a hint for next time */
283                         return (mm->free_area_cache = addr);
284                 }
285
286                 /* remember the largest hole we saw so far */
287                 if (addr + mm->cached_hole_size < vma->vm_start)
288                         mm->cached_hole_size = vma->vm_start - addr;
289
290                 /* try just below the current vma->vm_start */
291                 addr = vma->vm_start-len;
292                 if (do_color_align)
293                         addr = COLOUR_ALIGN_DOWN(addr, pgoff);
294         } while (likely(len < vma->vm_start));
295
296 bottomup:
297         /*
298          * A failed mmap() very likely causes application failure,
299          * so fall back to the bottom-up function here. This scenario
300          * can happen with large stack limits and large mmap()
301          * allocations.
302          */
303         mm->cached_hole_size = ~0UL;
304         mm->free_area_cache = TASK_UNMAPPED_BASE;
305         addr = arch_get_unmapped_area(filp, addr0, len, pgoff, flags);
306         /*
307          * Restore the topdown base:
308          */
309         mm->free_area_cache = mm->mmap_base;
310         mm->cached_hole_size = ~0UL;
311
312         return addr;
313 }
314
315 /* Try to align mapping such that we align it as much as possible. */
316 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
317 {
318         unsigned long align_goal, addr = -ENOMEM;
319
320         if (flags & MAP_FIXED) {
321                 /* Ok, don't mess with it. */
322                 return get_unmapped_area(NULL, addr, len, pgoff, flags);
323         }
324         flags &= ~MAP_SHARED;
325
326         align_goal = PAGE_SIZE;
327         if (len >= (4UL * 1024 * 1024))
328                 align_goal = (4UL * 1024 * 1024);
329         else if (len >= (512UL * 1024))
330                 align_goal = (512UL * 1024);
331         else if (len >= (64UL * 1024))
332                 align_goal = (64UL * 1024);
333
334         do {
335                 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
336                 if (!(addr & ~PAGE_MASK)) {
337                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
338                         break;
339                 }
340
341                 if (align_goal == (4UL * 1024 * 1024))
342                         align_goal = (512UL * 1024);
343                 else if (align_goal == (512UL * 1024))
344                         align_goal = (64UL * 1024);
345                 else
346                         align_goal = PAGE_SIZE;
347         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
348
349         /* Mapping is smaller than 64K or larger areas could not
350          * be obtained.
351          */
352         if (addr & ~PAGE_MASK)
353                 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
354
355         return addr;
356 }
357
358 /* Essentially the same as PowerPC... */
359 void arch_pick_mmap_layout(struct mm_struct *mm)
360 {
361         unsigned long random_factor = 0UL;
362
363         if (current->flags & PF_RANDOMIZE) {
364                 random_factor = get_random_int();
365                 if (test_thread_flag(TIF_32BIT))
366                         random_factor &= ((1 * 1024 * 1024) - 1);
367                 else
368                         random_factor = ((random_factor << PAGE_SHIFT) &
369                                          0xffffffffUL);
370         }
371
372         /*
373          * Fall back to the standard layout if the personality
374          * bit is set, or if the expected stack growth is unlimited:
375          */
376         if (!test_thread_flag(TIF_32BIT) ||
377             (current->personality & ADDR_COMPAT_LAYOUT) ||
378             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
379             sysctl_legacy_va_layout) {
380                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
381                 mm->get_unmapped_area = arch_get_unmapped_area;
382                 mm->unmap_area = arch_unmap_area;
383         } else {
384                 /* We know it's 32-bit */
385                 unsigned long task_size = STACK_TOP32;
386                 unsigned long gap;
387
388                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
389                 if (gap < 128 * 1024 * 1024)
390                         gap = 128 * 1024 * 1024;
391                 if (gap > (task_size / 6 * 5))
392                         gap = (task_size / 6 * 5);
393
394                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
395                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
396                 mm->unmap_area = arch_unmap_area_topdown;
397         }
398 }
399
400 asmlinkage unsigned long sparc_brk(unsigned long brk)
401 {
402         /* People could try to be nasty and use ta 0x6d in 32bit programs */
403         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
404                 return current->mm->brk;
405
406         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
407                 return current->mm->brk;
408
409         return sys_brk(brk);
410 }
411                                                                 
412 /*
413  * sys_pipe() is the normal C calling standard for creating
414  * a pipe. It's not the way unix traditionally does this, though.
415  */
416 asmlinkage long sparc_pipe(struct pt_regs *regs)
417 {
418         int fd[2];
419         int error;
420
421         error = do_pipe(fd);
422         if (error)
423                 goto out;
424         regs->u_regs[UREG_I1] = fd[1];
425         error = fd[0];
426 out:
427         return error;
428 }
429
430 /*
431  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
432  *
433  * This is really horribly ugly.
434  */
435
436 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
437                         unsigned long third, void __user *ptr, long fifth)
438 {
439         int err;
440
441         /* No need for backward compatibility. We can start fresh... */
442         if (call <= SEMCTL) {
443                 switch (call) {
444                 case SEMOP:
445                         err = sys_semtimedop(first, ptr,
446                                              (unsigned)second, NULL);
447                         goto out;
448                 case SEMTIMEDOP:
449                         err = sys_semtimedop(first, ptr, (unsigned)second,
450                                 (const struct timespec __user *) fifth);
451                         goto out;
452                 case SEMGET:
453                         err = sys_semget(first, (int)second, (int)third);
454                         goto out;
455                 case SEMCTL: {
456                         union semun fourth;
457                         err = -EINVAL;
458                         if (!ptr)
459                                 goto out;
460                         err = -EFAULT;
461                         if (get_user(fourth.__pad,
462                                      (void __user * __user *) ptr))
463                                 goto out;
464                         err = sys_semctl(first, (int)second | IPC_64,
465                                          (int)third, fourth);
466                         goto out;
467                 }
468                 default:
469                         err = -ENOSYS;
470                         goto out;
471                 };
472         }
473         if (call <= MSGCTL) {
474                 switch (call) {
475                 case MSGSND:
476                         err = sys_msgsnd(first, ptr, (size_t)second,
477                                          (int)third);
478                         goto out;
479                 case MSGRCV:
480                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
481                                          (int)third);
482                         goto out;
483                 case MSGGET:
484                         err = sys_msgget((key_t)first, (int)second);
485                         goto out;
486                 case MSGCTL:
487                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
488                         goto out;
489                 default:
490                         err = -ENOSYS;
491                         goto out;
492                 };
493         }
494         if (call <= SHMCTL) {
495                 switch (call) {
496                 case SHMAT: {
497                         ulong raddr;
498                         err = do_shmat(first, ptr, (int)second, &raddr);
499                         if (!err) {
500                                 if (put_user(raddr,
501                                              (ulong __user *) third))
502                                         err = -EFAULT;
503                         }
504                         goto out;
505                 }
506                 case SHMDT:
507                         err = sys_shmdt(ptr);
508                         goto out;
509                 case SHMGET:
510                         err = sys_shmget(first, (size_t)second, (int)third);
511                         goto out;
512                 case SHMCTL:
513                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
514                         goto out;
515                 default:
516                         err = -ENOSYS;
517                         goto out;
518                 };
519         } else {
520                 err = -ENOSYS;
521         }
522 out:
523         return err;
524 }
525
526 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
527 {
528         int ret = sys_newuname(name);
529         
530         if (current->personality == PER_LINUX32 && !ret) {
531                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
532                        ? -EFAULT : 0);
533         }
534         return ret;
535 }
536
537 asmlinkage long sparc64_personality(unsigned long personality)
538 {
539         int ret;
540
541         if (current->personality == PER_LINUX32 &&
542             personality == PER_LINUX)
543                 personality = PER_LINUX32;
544         ret = sys_personality(personality);
545         if (ret == PER_LINUX32)
546                 ret = PER_LINUX;
547
548         return ret;
549 }
550
551 int sparc64_mmap_check(unsigned long addr, unsigned long len,
552                 unsigned long flags)
553 {
554         if (test_thread_flag(TIF_32BIT)) {
555                 if (len >= STACK_TOP32)
556                         return -EINVAL;
557
558                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
559                         return -EINVAL;
560         } else {
561                 if (len >= VA_EXCLUDE_START)
562                         return -EINVAL;
563
564                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
565                         return -EINVAL;
566         }
567
568         return 0;
569 }
570
571 /* Linux version of mmap */
572 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
573         unsigned long prot, unsigned long flags, unsigned long fd,
574         unsigned long off)
575 {
576         struct file * file = NULL;
577         unsigned long retval = -EBADF;
578
579         if (!(flags & MAP_ANONYMOUS)) {
580                 file = fget(fd);
581                 if (!file)
582                         goto out;
583         }
584         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
585         len = PAGE_ALIGN(len);
586
587         down_write(&current->mm->mmap_sem);
588         retval = do_mmap(file, addr, len, prot, flags, off);
589         up_write(&current->mm->mmap_sem);
590
591         if (file)
592                 fput(file);
593 out:
594         return retval;
595 }
596
597 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
598 {
599         long ret;
600
601         if (invalid_64bit_range(addr, len))
602                 return -EINVAL;
603
604         down_write(&current->mm->mmap_sem);
605         ret = do_munmap(current->mm, addr, len);
606         up_write(&current->mm->mmap_sem);
607         return ret;
608 }
609
610 extern unsigned long do_mremap(unsigned long addr,
611         unsigned long old_len, unsigned long new_len,
612         unsigned long flags, unsigned long new_addr);
613                 
614 asmlinkage unsigned long sys64_mremap(unsigned long addr,
615         unsigned long old_len, unsigned long new_len,
616         unsigned long flags, unsigned long new_addr)
617 {
618         struct vm_area_struct *vma;
619         unsigned long ret = -EINVAL;
620
621         if (test_thread_flag(TIF_32BIT))
622                 goto out;
623         if (unlikely(new_len >= VA_EXCLUDE_START))
624                 goto out;
625         if (unlikely(invalid_64bit_range(addr, old_len)))
626                 goto out;
627
628         down_write(&current->mm->mmap_sem);
629         if (flags & MREMAP_FIXED) {
630                 if (invalid_64bit_range(new_addr, new_len))
631                         goto out_sem;
632         } else if (invalid_64bit_range(addr, new_len)) {
633                 unsigned long map_flags = 0;
634                 struct file *file = NULL;
635
636                 ret = -ENOMEM;
637                 if (!(flags & MREMAP_MAYMOVE))
638                         goto out_sem;
639
640                 vma = find_vma(current->mm, addr);
641                 if (vma) {
642                         if (vma->vm_flags & VM_SHARED)
643                                 map_flags |= MAP_SHARED;
644                         file = vma->vm_file;
645                 }
646
647                 /* MREMAP_FIXED checked above. */
648                 new_addr = get_unmapped_area(file, addr, new_len,
649                                     vma ? vma->vm_pgoff : 0,
650                                     map_flags);
651                 ret = new_addr;
652                 if (new_addr & ~PAGE_MASK)
653                         goto out_sem;
654                 flags |= MREMAP_FIXED;
655         }
656         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
657 out_sem:
658         up_write(&current->mm->mmap_sem);
659 out:
660         return ret;       
661 }
662
663 /* we come to here via sys_nis_syscall so it can setup the regs argument */
664 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
665 {
666         static int count;
667         
668         /* Don't make the system unusable, if someone goes stuck */
669         if (count++ > 5)
670                 return -ENOSYS;
671
672         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
673 #ifdef DEBUG_UNIMP_SYSCALL      
674         show_regs (regs);
675 #endif
676
677         return -ENOSYS;
678 }
679
680 /* #define DEBUG_SPARC_BREAKPOINT */
681
682 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
683 {
684         siginfo_t info;
685
686         if (test_thread_flag(TIF_32BIT)) {
687                 regs->tpc &= 0xffffffff;
688                 regs->tnpc &= 0xffffffff;
689         }
690 #ifdef DEBUG_SPARC_BREAKPOINT
691         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
692 #endif
693         info.si_signo = SIGTRAP;
694         info.si_errno = 0;
695         info.si_code = TRAP_BRKPT;
696         info.si_addr = (void __user *)regs->tpc;
697         info.si_trapno = 0;
698         force_sig_info(SIGTRAP, &info, current);
699 #ifdef DEBUG_SPARC_BREAKPOINT
700         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
701 #endif
702 }
703
704 extern void check_pending(int signum);
705
706 asmlinkage long sys_getdomainname(char __user *name, int len)
707 {
708         int nlen, err;
709
710         if (len < 0)
711                 return -EINVAL;
712
713         down_read(&uts_sem);
714         
715         nlen = strlen(utsname()->domainname) + 1;
716         err = -EINVAL;
717         if (nlen > len)
718                 goto out;
719
720         err = -EFAULT;
721         if (!copy_to_user(name, utsname()->domainname, nlen))
722                 err = 0;
723
724 out:
725         up_read(&uts_sem);
726         return err;
727 }
728
729 asmlinkage long solaris_syscall(struct pt_regs *regs)
730 {
731         static int count;
732
733         regs->tpc = regs->tnpc;
734         regs->tnpc += 4;
735         if (test_thread_flag(TIF_32BIT)) {
736                 regs->tpc &= 0xffffffff;
737                 regs->tnpc &= 0xffffffff;
738         }
739         if (++count <= 5) {
740                 printk ("For Solaris binary emulation you need solaris module loaded\n");
741                 show_regs (regs);
742         }
743         send_sig(SIGSEGV, current, 1);
744
745         return -ENOSYS;
746 }
747
748 #ifndef CONFIG_SUNOS_EMUL
749 asmlinkage long sunos_syscall(struct pt_regs *regs)
750 {
751         static int count;
752
753         regs->tpc = regs->tnpc;
754         regs->tnpc += 4;
755         if (test_thread_flag(TIF_32BIT)) {
756                 regs->tpc &= 0xffffffff;
757                 regs->tnpc &= 0xffffffff;
758         }
759         if (++count <= 20)
760                 printk ("SunOS binary emulation not compiled in\n");
761         force_sig(SIGSEGV, current);
762
763         return -ENOSYS;
764 }
765 #endif
766
767 asmlinkage long sys_utrap_install(utrap_entry_t type,
768                                   utrap_handler_t new_p,
769                                   utrap_handler_t new_d,
770                                   utrap_handler_t __user *old_p,
771                                   utrap_handler_t __user *old_d)
772 {
773         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
774                 return -EINVAL;
775         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
776                 if (old_p) {
777                         if (!current_thread_info()->utraps) {
778                                 if (put_user(NULL, old_p))
779                                         return -EFAULT;
780                         } else {
781                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
782                                         return -EFAULT;
783                         }
784                 }
785                 if (old_d) {
786                         if (put_user(NULL, old_d))
787                                 return -EFAULT;
788                 }
789                 return 0;
790         }
791         if (!current_thread_info()->utraps) {
792                 current_thread_info()->utraps =
793                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
794                 if (!current_thread_info()->utraps)
795                         return -ENOMEM;
796                 current_thread_info()->utraps[0] = 1;
797         } else {
798                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
799                     current_thread_info()->utraps[0] > 1) {
800                         long *p = current_thread_info()->utraps;
801
802                         current_thread_info()->utraps =
803                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
804                                         GFP_KERNEL);
805                         if (!current_thread_info()->utraps) {
806                                 current_thread_info()->utraps = p;
807                                 return -ENOMEM;
808                         }
809                         p[0]--;
810                         current_thread_info()->utraps[0] = 1;
811                         memcpy(current_thread_info()->utraps+1, p+1,
812                                UT_TRAP_INSTRUCTION_31*sizeof(long));
813                 }
814         }
815         if (old_p) {
816                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
817                         return -EFAULT;
818         }
819         if (old_d) {
820                 if (put_user(NULL, old_d))
821                         return -EFAULT;
822         }
823         current_thread_info()->utraps[type] = (long)new_p;
824
825         return 0;
826 }
827
828 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
829 {
830         if (model >= 3)
831                 return -EINVAL;
832         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
833         return 0;
834 }
835
836 asmlinkage long sys_rt_sigaction(int sig,
837                                  const struct sigaction __user *act,
838                                  struct sigaction __user *oact,
839                                  void __user *restorer,
840                                  size_t sigsetsize)
841 {
842         struct k_sigaction new_ka, old_ka;
843         int ret;
844
845         /* XXX: Don't preclude handling different sized sigset_t's.  */
846         if (sigsetsize != sizeof(sigset_t))
847                 return -EINVAL;
848
849         if (act) {
850                 new_ka.ka_restorer = restorer;
851                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
852                         return -EFAULT;
853         }
854
855         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
856
857         if (!ret && oact) {
858                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
859                         return -EFAULT;
860         }
861
862         return ret;
863 }
864
865 /* Invoked by rtrap code to update performance counters in
866  * user space.
867  */
868 asmlinkage void update_perfctrs(void)
869 {
870         unsigned long pic, tmp;
871
872         read_pic(pic);
873         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
874         __put_user(tmp, current_thread_info()->user_cntd0);
875         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
876         __put_user(tmp, current_thread_info()->user_cntd1);
877         reset_pic();
878 }
879
880 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
881 {
882         int err = 0;
883
884         switch(opcode) {
885         case PERFCTR_ON:
886                 current_thread_info()->pcr_reg = arg2;
887                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
888                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
889                 current_thread_info()->kernel_cntd0 =
890                         current_thread_info()->kernel_cntd1 = 0;
891                 write_pcr(arg2);
892                 reset_pic();
893                 set_thread_flag(TIF_PERFCTR);
894                 break;
895
896         case PERFCTR_OFF:
897                 err = -EINVAL;
898                 if (test_thread_flag(TIF_PERFCTR)) {
899                         current_thread_info()->user_cntd0 =
900                                 current_thread_info()->user_cntd1 = NULL;
901                         current_thread_info()->pcr_reg = 0;
902                         write_pcr(0);
903                         clear_thread_flag(TIF_PERFCTR);
904                         err = 0;
905                 }
906                 break;
907
908         case PERFCTR_READ: {
909                 unsigned long pic, tmp;
910
911                 if (!test_thread_flag(TIF_PERFCTR)) {
912                         err = -EINVAL;
913                         break;
914                 }
915                 read_pic(pic);
916                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
917                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
918                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
919                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
920                 reset_pic();
921                 break;
922         }
923
924         case PERFCTR_CLRPIC:
925                 if (!test_thread_flag(TIF_PERFCTR)) {
926                         err = -EINVAL;
927                         break;
928                 }
929                 current_thread_info()->kernel_cntd0 =
930                         current_thread_info()->kernel_cntd1 = 0;
931                 reset_pic();
932                 break;
933
934         case PERFCTR_SETPCR: {
935                 u64 __user *user_pcr = (u64 __user *)arg0;
936
937                 if (!test_thread_flag(TIF_PERFCTR)) {
938                         err = -EINVAL;
939                         break;
940                 }
941                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
942                 write_pcr(current_thread_info()->pcr_reg);
943                 current_thread_info()->kernel_cntd0 =
944                         current_thread_info()->kernel_cntd1 = 0;
945                 reset_pic();
946                 break;
947         }
948
949         case PERFCTR_GETPCR: {
950                 u64 __user *user_pcr = (u64 __user *)arg0;
951
952                 if (!test_thread_flag(TIF_PERFCTR)) {
953                         err = -EINVAL;
954                         break;
955                 }
956                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
957                 break;
958         }
959
960         default:
961                 err = -EINVAL;
962                 break;
963         };
964         return err;
965 }