Merge branch 'cfq-merge' of git://brick.kernel.dk/data/git/linux-2.6-block
[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 #include <linux/random.h>
29
30 #include <asm/uaccess.h>
31 #include <asm/ipc.h>
32 #include <asm/utrap.h>
33 #include <asm/perfctr.h>
34 #include <asm/a.out.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, 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
359 /* Essentially the same as PowerPC... */
360 void arch_pick_mmap_layout(struct mm_struct *mm)
361 {
362         unsigned long random_factor = 0UL;
363
364         if (current->flags & PF_RANDOMIZE) {
365                 random_factor = get_random_int();
366                 if (test_thread_flag(TIF_32BIT))
367                         random_factor &= ((1 * 1024 * 1024) - 1);
368                 else
369                         random_factor = ((random_factor << PAGE_SHIFT) &
370                                          0xffffffffUL);
371         }
372
373         /*
374          * Fall back to the standard layout if the personality
375          * bit is set, or if the expected stack growth is unlimited:
376          */
377         if (!test_thread_flag(TIF_32BIT) ||
378             (current->personality & ADDR_COMPAT_LAYOUT) ||
379             current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
380             sysctl_legacy_va_layout) {
381                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
382                 mm->get_unmapped_area = arch_get_unmapped_area;
383                 mm->unmap_area = arch_unmap_area;
384         } else {
385                 /* We know it's 32-bit */
386                 unsigned long task_size = STACK_TOP32;
387                 unsigned long gap;
388
389                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
390                 if (gap < 128 * 1024 * 1024)
391                         gap = 128 * 1024 * 1024;
392                 if (gap > (task_size / 6 * 5))
393                         gap = (task_size / 6 * 5);
394
395                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
396                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
397                 mm->unmap_area = arch_unmap_area_topdown;
398         }
399 }
400
401 asmlinkage unsigned long sparc_brk(unsigned long brk)
402 {
403         /* People could try to be nasty and use ta 0x6d in 32bit programs */
404         if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
405                 return current->mm->brk;
406
407         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
408                 return current->mm->brk;
409
410         return sys_brk(brk);
411 }
412                                                                 
413 /*
414  * sys_pipe() is the normal C calling standard for creating
415  * a pipe. It's not the way unix traditionally does this, though.
416  */
417 asmlinkage long sparc_pipe(struct pt_regs *regs)
418 {
419         int fd[2];
420         int error;
421
422         error = do_pipe(fd);
423         if (error)
424                 goto out;
425         regs->u_regs[UREG_I1] = fd[1];
426         error = fd[0];
427 out:
428         return error;
429 }
430
431 /*
432  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
433  *
434  * This is really horribly ugly.
435  */
436
437 asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
438                         unsigned long third, void __user *ptr, long fifth)
439 {
440         int err;
441
442         /* No need for backward compatibility. We can start fresh... */
443         if (call <= SEMCTL) {
444                 switch (call) {
445                 case SEMOP:
446                         err = sys_semtimedop(first, ptr,
447                                              (unsigned)second, NULL);
448                         goto out;
449                 case SEMTIMEDOP:
450                         err = sys_semtimedop(first, ptr, (unsigned)second,
451                                 (const struct timespec __user *) fifth);
452                         goto out;
453                 case SEMGET:
454                         err = sys_semget(first, (int)second, (int)third);
455                         goto out;
456                 case SEMCTL: {
457                         union semun fourth;
458                         err = -EINVAL;
459                         if (!ptr)
460                                 goto out;
461                         err = -EFAULT;
462                         if (get_user(fourth.__pad,
463                                      (void __user * __user *) ptr))
464                                 goto out;
465                         err = sys_semctl(first, (int)second | IPC_64,
466                                          (int)third, fourth);
467                         goto out;
468                 }
469                 default:
470                         err = -ENOSYS;
471                         goto out;
472                 };
473         }
474         if (call <= MSGCTL) {
475                 switch (call) {
476                 case MSGSND:
477                         err = sys_msgsnd(first, ptr, (size_t)second,
478                                          (int)third);
479                         goto out;
480                 case MSGRCV:
481                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
482                                          (int)third);
483                         goto out;
484                 case MSGGET:
485                         err = sys_msgget((key_t)first, (int)second);
486                         goto out;
487                 case MSGCTL:
488                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
489                         goto out;
490                 default:
491                         err = -ENOSYS;
492                         goto out;
493                 };
494         }
495         if (call <= SHMCTL) {
496                 switch (call) {
497                 case SHMAT: {
498                         ulong raddr;
499                         err = do_shmat(first, ptr, (int)second, &raddr);
500                         if (!err) {
501                                 if (put_user(raddr,
502                                              (ulong __user *) third))
503                                         err = -EFAULT;
504                         }
505                         goto out;
506                 }
507                 case SHMDT:
508                         err = sys_shmdt(ptr);
509                         goto out;
510                 case SHMGET:
511                         err = sys_shmget(first, (size_t)second, (int)third);
512                         goto out;
513                 case SHMCTL:
514                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
515                         goto out;
516                 default:
517                         err = -ENOSYS;
518                         goto out;
519                 };
520         } else {
521                 err = -ENOSYS;
522         }
523 out:
524         return err;
525 }
526
527 asmlinkage long sparc64_newuname(struct new_utsname __user *name)
528 {
529         int ret = sys_newuname(name);
530         
531         if (current->personality == PER_LINUX32 && !ret) {
532                 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
533                        ? -EFAULT : 0);
534         }
535         return ret;
536 }
537
538 asmlinkage long sparc64_personality(unsigned long personality)
539 {
540         int ret;
541
542         if (current->personality == PER_LINUX32 &&
543             personality == PER_LINUX)
544                 personality = PER_LINUX32;
545         ret = sys_personality(personality);
546         if (ret == PER_LINUX32)
547                 ret = PER_LINUX;
548
549         return ret;
550 }
551
552 /* Linux version of mmap */
553 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
554         unsigned long prot, unsigned long flags, unsigned long fd,
555         unsigned long off)
556 {
557         struct file * file = NULL;
558         unsigned long retval = -EBADF;
559
560         if (!(flags & MAP_ANONYMOUS)) {
561                 file = fget(fd);
562                 if (!file)
563                         goto out;
564         }
565         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
566         len = PAGE_ALIGN(len);
567         retval = -EINVAL;
568
569         if (test_thread_flag(TIF_32BIT)) {
570                 if (len >= STACK_TOP32)
571                         goto out_putf;
572
573                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
574                         goto out_putf;
575         } else {
576                 if (len >= VA_EXCLUDE_START)
577                         goto out_putf;
578
579                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
580                         goto out_putf;
581         }
582
583         down_write(&current->mm->mmap_sem);
584         retval = do_mmap(file, addr, len, prot, flags, off);
585         up_write(&current->mm->mmap_sem);
586
587 out_putf:
588         if (file)
589                 fput(file);
590 out:
591         return retval;
592 }
593
594 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
595 {
596         long ret;
597
598         if (invalid_64bit_range(addr, len))
599                 return -EINVAL;
600
601         down_write(&current->mm->mmap_sem);
602         ret = do_munmap(current->mm, addr, len);
603         up_write(&current->mm->mmap_sem);
604         return ret;
605 }
606
607 extern unsigned long do_mremap(unsigned long addr,
608         unsigned long old_len, unsigned long new_len,
609         unsigned long flags, unsigned long new_addr);
610                 
611 asmlinkage unsigned long sys64_mremap(unsigned long addr,
612         unsigned long old_len, unsigned long new_len,
613         unsigned long flags, unsigned long new_addr)
614 {
615         struct vm_area_struct *vma;
616         unsigned long ret = -EINVAL;
617
618         if (test_thread_flag(TIF_32BIT))
619                 goto out;
620         if (unlikely(new_len >= VA_EXCLUDE_START))
621                 goto out;
622         if (unlikely(invalid_64bit_range(addr, old_len)))
623                 goto out;
624
625         down_write(&current->mm->mmap_sem);
626         if (flags & MREMAP_FIXED) {
627                 if (invalid_64bit_range(new_addr, new_len))
628                         goto out_sem;
629         } else if (invalid_64bit_range(addr, new_len)) {
630                 unsigned long map_flags = 0;
631                 struct file *file = NULL;
632
633                 ret = -ENOMEM;
634                 if (!(flags & MREMAP_MAYMOVE))
635                         goto out_sem;
636
637                 vma = find_vma(current->mm, addr);
638                 if (vma) {
639                         if (vma->vm_flags & VM_SHARED)
640                                 map_flags |= MAP_SHARED;
641                         file = vma->vm_file;
642                 }
643
644                 /* MREMAP_FIXED checked above. */
645                 new_addr = get_unmapped_area(file, addr, new_len,
646                                     vma ? vma->vm_pgoff : 0,
647                                     map_flags);
648                 ret = new_addr;
649                 if (new_addr & ~PAGE_MASK)
650                         goto out_sem;
651                 flags |= MREMAP_FIXED;
652         }
653         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
654 out_sem:
655         up_write(&current->mm->mmap_sem);
656 out:
657         return ret;       
658 }
659
660 /* we come to here via sys_nis_syscall so it can setup the regs argument */
661 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
662 {
663         static int count;
664         
665         /* Don't make the system unusable, if someone goes stuck */
666         if (count++ > 5)
667                 return -ENOSYS;
668
669         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
670 #ifdef DEBUG_UNIMP_SYSCALL      
671         show_regs (regs);
672 #endif
673
674         return -ENOSYS;
675 }
676
677 /* #define DEBUG_SPARC_BREAKPOINT */
678
679 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
680 {
681         siginfo_t info;
682
683         if (test_thread_flag(TIF_32BIT)) {
684                 regs->tpc &= 0xffffffff;
685                 regs->tnpc &= 0xffffffff;
686         }
687 #ifdef DEBUG_SPARC_BREAKPOINT
688         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
689 #endif
690         info.si_signo = SIGTRAP;
691         info.si_errno = 0;
692         info.si_code = TRAP_BRKPT;
693         info.si_addr = (void __user *)regs->tpc;
694         info.si_trapno = 0;
695         force_sig_info(SIGTRAP, &info, current);
696 #ifdef DEBUG_SPARC_BREAKPOINT
697         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
698 #endif
699 }
700
701 extern void check_pending(int signum);
702
703 asmlinkage long sys_getdomainname(char __user *name, int len)
704 {
705         int nlen;
706         int err = -EFAULT;
707
708         down_read(&uts_sem);
709         
710         nlen = strlen(system_utsname.domainname) + 1;
711
712         if (nlen < len)
713                 len = nlen;
714         if (len > __NEW_UTS_LEN)
715                 goto done;
716         if (copy_to_user(name, system_utsname.domainname, len))
717                 goto done;
718         err = 0;
719 done:
720         up_read(&uts_sem);
721         return err;
722 }
723
724 asmlinkage long solaris_syscall(struct pt_regs *regs)
725 {
726         static int count;
727
728         regs->tpc = regs->tnpc;
729         regs->tnpc += 4;
730         if (test_thread_flag(TIF_32BIT)) {
731                 regs->tpc &= 0xffffffff;
732                 regs->tnpc &= 0xffffffff;
733         }
734         if (++count <= 5) {
735                 printk ("For Solaris binary emulation you need solaris module loaded\n");
736                 show_regs (regs);
737         }
738         send_sig(SIGSEGV, current, 1);
739
740         return -ENOSYS;
741 }
742
743 #ifndef CONFIG_SUNOS_EMUL
744 asmlinkage long sunos_syscall(struct pt_regs *regs)
745 {
746         static int count;
747
748         regs->tpc = regs->tnpc;
749         regs->tnpc += 4;
750         if (test_thread_flag(TIF_32BIT)) {
751                 regs->tpc &= 0xffffffff;
752                 regs->tnpc &= 0xffffffff;
753         }
754         if (++count <= 20)
755                 printk ("SunOS binary emulation not compiled in\n");
756         force_sig(SIGSEGV, current);
757
758         return -ENOSYS;
759 }
760 #endif
761
762 asmlinkage long sys_utrap_install(utrap_entry_t type,
763                                   utrap_handler_t new_p,
764                                   utrap_handler_t new_d,
765                                   utrap_handler_t __user *old_p,
766                                   utrap_handler_t __user *old_d)
767 {
768         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
769                 return -EINVAL;
770         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
771                 if (old_p) {
772                         if (!current_thread_info()->utraps) {
773                                 if (put_user(NULL, old_p))
774                                         return -EFAULT;
775                         } else {
776                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
777                                         return -EFAULT;
778                         }
779                 }
780                 if (old_d) {
781                         if (put_user(NULL, old_d))
782                                 return -EFAULT;
783                 }
784                 return 0;
785         }
786         if (!current_thread_info()->utraps) {
787                 current_thread_info()->utraps =
788                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
789                 if (!current_thread_info()->utraps)
790                         return -ENOMEM;
791                 current_thread_info()->utraps[0] = 1;
792         } else {
793                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
794                     current_thread_info()->utraps[0] > 1) {
795                         long *p = current_thread_info()->utraps;
796
797                         current_thread_info()->utraps =
798                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
799                                         GFP_KERNEL);
800                         if (!current_thread_info()->utraps) {
801                                 current_thread_info()->utraps = p;
802                                 return -ENOMEM;
803                         }
804                         p[0]--;
805                         current_thread_info()->utraps[0] = 1;
806                         memcpy(current_thread_info()->utraps+1, p+1,
807                                UT_TRAP_INSTRUCTION_31*sizeof(long));
808                 }
809         }
810         if (old_p) {
811                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
812                         return -EFAULT;
813         }
814         if (old_d) {
815                 if (put_user(NULL, old_d))
816                         return -EFAULT;
817         }
818         current_thread_info()->utraps[type] = (long)new_p;
819
820         return 0;
821 }
822
823 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
824 {
825         if (model >= 3)
826                 return -EINVAL;
827         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
828         return 0;
829 }
830
831 asmlinkage long sys_rt_sigaction(int sig,
832                                  const struct sigaction __user *act,
833                                  struct sigaction __user *oact,
834                                  void __user *restorer,
835                                  size_t sigsetsize)
836 {
837         struct k_sigaction new_ka, old_ka;
838         int ret;
839
840         /* XXX: Don't preclude handling different sized sigset_t's.  */
841         if (sigsetsize != sizeof(sigset_t))
842                 return -EINVAL;
843
844         if (act) {
845                 new_ka.ka_restorer = restorer;
846                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
847                         return -EFAULT;
848         }
849
850         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
851
852         if (!ret && oact) {
853                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
854                         return -EFAULT;
855         }
856
857         return ret;
858 }
859
860 /* Invoked by rtrap code to update performance counters in
861  * user space.
862  */
863 asmlinkage void update_perfctrs(void)
864 {
865         unsigned long pic, tmp;
866
867         read_pic(pic);
868         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
869         __put_user(tmp, current_thread_info()->user_cntd0);
870         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
871         __put_user(tmp, current_thread_info()->user_cntd1);
872         reset_pic();
873 }
874
875 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
876 {
877         int err = 0;
878
879         switch(opcode) {
880         case PERFCTR_ON:
881                 current_thread_info()->pcr_reg = arg2;
882                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
883                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
884                 current_thread_info()->kernel_cntd0 =
885                         current_thread_info()->kernel_cntd1 = 0;
886                 write_pcr(arg2);
887                 reset_pic();
888                 set_thread_flag(TIF_PERFCTR);
889                 break;
890
891         case PERFCTR_OFF:
892                 err = -EINVAL;
893                 if (test_thread_flag(TIF_PERFCTR)) {
894                         current_thread_info()->user_cntd0 =
895                                 current_thread_info()->user_cntd1 = NULL;
896                         current_thread_info()->pcr_reg = 0;
897                         write_pcr(0);
898                         clear_thread_flag(TIF_PERFCTR);
899                         err = 0;
900                 }
901                 break;
902
903         case PERFCTR_READ: {
904                 unsigned long pic, tmp;
905
906                 if (!test_thread_flag(TIF_PERFCTR)) {
907                         err = -EINVAL;
908                         break;
909                 }
910                 read_pic(pic);
911                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
912                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
913                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
914                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
915                 reset_pic();
916                 break;
917         }
918
919         case PERFCTR_CLRPIC:
920                 if (!test_thread_flag(TIF_PERFCTR)) {
921                         err = -EINVAL;
922                         break;
923                 }
924                 current_thread_info()->kernel_cntd0 =
925                         current_thread_info()->kernel_cntd1 = 0;
926                 reset_pic();
927                 break;
928
929         case PERFCTR_SETPCR: {
930                 u64 __user *user_pcr = (u64 __user *)arg0;
931
932                 if (!test_thread_flag(TIF_PERFCTR)) {
933                         err = -EINVAL;
934                         break;
935                 }
936                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
937                 write_pcr(current_thread_info()->pcr_reg);
938                 current_thread_info()->kernel_cntd0 =
939                         current_thread_info()->kernel_cntd1 = 0;
940                 reset_pic();
941                 break;
942         }
943
944         case PERFCTR_GETPCR: {
945                 u64 __user *user_pcr = (u64 __user *)arg0;
946
947                 if (!test_thread_flag(TIF_PERFCTR)) {
948                         err = -EINVAL;
949                         break;
950                 }
951                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
952                 break;
953         }
954
955         default:
956                 err = -EINVAL;
957                 break;
958         };
959         return err;
960 }