Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[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/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 #include <asm/unistd.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 int sparc64_mmap_check(unsigned long addr, unsigned long len,
553                 unsigned long flags)
554 {
555         if (test_thread_flag(TIF_32BIT)) {
556                 if (len >= STACK_TOP32)
557                         return -EINVAL;
558
559                 if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
560                         return -EINVAL;
561         } else {
562                 if (len >= VA_EXCLUDE_START)
563                         return -EINVAL;
564
565                 if ((flags & MAP_FIXED) && invalid_64bit_range(addr, len))
566                         return -EINVAL;
567         }
568
569         return 0;
570 }
571
572 /* Linux version of mmap */
573 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
574         unsigned long prot, unsigned long flags, unsigned long fd,
575         unsigned long off)
576 {
577         struct file * file = NULL;
578         unsigned long retval = -EBADF;
579
580         if (!(flags & MAP_ANONYMOUS)) {
581                 file = fget(fd);
582                 if (!file)
583                         goto out;
584         }
585         flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
586         len = PAGE_ALIGN(len);
587
588         down_write(&current->mm->mmap_sem);
589         retval = do_mmap(file, addr, len, prot, flags, off);
590         up_write(&current->mm->mmap_sem);
591
592         if (file)
593                 fput(file);
594 out:
595         return retval;
596 }
597
598 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
599 {
600         long ret;
601
602         if (invalid_64bit_range(addr, len))
603                 return -EINVAL;
604
605         down_write(&current->mm->mmap_sem);
606         ret = do_munmap(current->mm, addr, len);
607         up_write(&current->mm->mmap_sem);
608         return ret;
609 }
610
611 extern unsigned long do_mremap(unsigned long addr,
612         unsigned long old_len, unsigned long new_len,
613         unsigned long flags, unsigned long new_addr);
614                 
615 asmlinkage unsigned long sys64_mremap(unsigned long addr,
616         unsigned long old_len, unsigned long new_len,
617         unsigned long flags, unsigned long new_addr)
618 {
619         struct vm_area_struct *vma;
620         unsigned long ret = -EINVAL;
621
622         if (test_thread_flag(TIF_32BIT))
623                 goto out;
624         if (unlikely(new_len >= VA_EXCLUDE_START))
625                 goto out;
626         if (unlikely(invalid_64bit_range(addr, old_len)))
627                 goto out;
628
629         down_write(&current->mm->mmap_sem);
630         if (flags & MREMAP_FIXED) {
631                 if (invalid_64bit_range(new_addr, new_len))
632                         goto out_sem;
633         } else if (invalid_64bit_range(addr, new_len)) {
634                 unsigned long map_flags = 0;
635                 struct file *file = NULL;
636
637                 ret = -ENOMEM;
638                 if (!(flags & MREMAP_MAYMOVE))
639                         goto out_sem;
640
641                 vma = find_vma(current->mm, addr);
642                 if (vma) {
643                         if (vma->vm_flags & VM_SHARED)
644                                 map_flags |= MAP_SHARED;
645                         file = vma->vm_file;
646                 }
647
648                 /* MREMAP_FIXED checked above. */
649                 new_addr = get_unmapped_area(file, addr, new_len,
650                                     vma ? vma->vm_pgoff : 0,
651                                     map_flags);
652                 ret = new_addr;
653                 if (new_addr & ~PAGE_MASK)
654                         goto out_sem;
655                 flags |= MREMAP_FIXED;
656         }
657         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
658 out_sem:
659         up_write(&current->mm->mmap_sem);
660 out:
661         return ret;       
662 }
663
664 /* we come to here via sys_nis_syscall so it can setup the regs argument */
665 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
666 {
667         static int count;
668         
669         /* Don't make the system unusable, if someone goes stuck */
670         if (count++ > 5)
671                 return -ENOSYS;
672
673         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
674 #ifdef DEBUG_UNIMP_SYSCALL      
675         show_regs (regs);
676 #endif
677
678         return -ENOSYS;
679 }
680
681 /* #define DEBUG_SPARC_BREAKPOINT */
682
683 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
684 {
685         siginfo_t info;
686
687         if (test_thread_flag(TIF_32BIT)) {
688                 regs->tpc &= 0xffffffff;
689                 regs->tnpc &= 0xffffffff;
690         }
691 #ifdef DEBUG_SPARC_BREAKPOINT
692         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
693 #endif
694         info.si_signo = SIGTRAP;
695         info.si_errno = 0;
696         info.si_code = TRAP_BRKPT;
697         info.si_addr = (void __user *)regs->tpc;
698         info.si_trapno = 0;
699         force_sig_info(SIGTRAP, &info, current);
700 #ifdef DEBUG_SPARC_BREAKPOINT
701         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
702 #endif
703 }
704
705 extern void check_pending(int signum);
706
707 asmlinkage long sys_getdomainname(char __user *name, int len)
708 {
709         int nlen, err;
710
711         if (len < 0)
712                 return -EINVAL;
713
714         down_read(&uts_sem);
715         
716         nlen = strlen(utsname()->domainname) + 1;
717         err = -EINVAL;
718         if (nlen > len)
719                 goto out;
720
721         err = -EFAULT;
722         if (!copy_to_user(name, utsname()->domainname, nlen))
723                 err = 0;
724
725 out:
726         up_read(&uts_sem);
727         return err;
728 }
729
730 asmlinkage long solaris_syscall(struct pt_regs *regs)
731 {
732         static int count;
733
734         regs->tpc = regs->tnpc;
735         regs->tnpc += 4;
736         if (test_thread_flag(TIF_32BIT)) {
737                 regs->tpc &= 0xffffffff;
738                 regs->tnpc &= 0xffffffff;
739         }
740         if (++count <= 5) {
741                 printk ("For Solaris binary emulation you need solaris module loaded\n");
742                 show_regs (regs);
743         }
744         send_sig(SIGSEGV, current, 1);
745
746         return -ENOSYS;
747 }
748
749 #ifndef CONFIG_SUNOS_EMUL
750 asmlinkage long sunos_syscall(struct pt_regs *regs)
751 {
752         static int count;
753
754         regs->tpc = regs->tnpc;
755         regs->tnpc += 4;
756         if (test_thread_flag(TIF_32BIT)) {
757                 regs->tpc &= 0xffffffff;
758                 regs->tnpc &= 0xffffffff;
759         }
760         if (++count <= 20)
761                 printk ("SunOS binary emulation not compiled in\n");
762         force_sig(SIGSEGV, current);
763
764         return -ENOSYS;
765 }
766 #endif
767
768 asmlinkage long sys_utrap_install(utrap_entry_t type,
769                                   utrap_handler_t new_p,
770                                   utrap_handler_t new_d,
771                                   utrap_handler_t __user *old_p,
772                                   utrap_handler_t __user *old_d)
773 {
774         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
775                 return -EINVAL;
776         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
777                 if (old_p) {
778                         if (!current_thread_info()->utraps) {
779                                 if (put_user(NULL, old_p))
780                                         return -EFAULT;
781                         } else {
782                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
783                                         return -EFAULT;
784                         }
785                 }
786                 if (old_d) {
787                         if (put_user(NULL, old_d))
788                                 return -EFAULT;
789                 }
790                 return 0;
791         }
792         if (!current_thread_info()->utraps) {
793                 current_thread_info()->utraps =
794                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
795                 if (!current_thread_info()->utraps)
796                         return -ENOMEM;
797                 current_thread_info()->utraps[0] = 1;
798         } else {
799                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
800                     current_thread_info()->utraps[0] > 1) {
801                         long *p = current_thread_info()->utraps;
802
803                         current_thread_info()->utraps =
804                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
805                                         GFP_KERNEL);
806                         if (!current_thread_info()->utraps) {
807                                 current_thread_info()->utraps = p;
808                                 return -ENOMEM;
809                         }
810                         p[0]--;
811                         current_thread_info()->utraps[0] = 1;
812                         memcpy(current_thread_info()->utraps+1, p+1,
813                                UT_TRAP_INSTRUCTION_31*sizeof(long));
814                 }
815         }
816         if (old_p) {
817                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
818                         return -EFAULT;
819         }
820         if (old_d) {
821                 if (put_user(NULL, old_d))
822                         return -EFAULT;
823         }
824         current_thread_info()->utraps[type] = (long)new_p;
825
826         return 0;
827 }
828
829 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
830 {
831         if (model >= 3)
832                 return -EINVAL;
833         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
834         return 0;
835 }
836
837 asmlinkage long sys_rt_sigaction(int sig,
838                                  const struct sigaction __user *act,
839                                  struct sigaction __user *oact,
840                                  void __user *restorer,
841                                  size_t sigsetsize)
842 {
843         struct k_sigaction new_ka, old_ka;
844         int ret;
845
846         /* XXX: Don't preclude handling different sized sigset_t's.  */
847         if (sigsetsize != sizeof(sigset_t))
848                 return -EINVAL;
849
850         if (act) {
851                 new_ka.ka_restorer = restorer;
852                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
853                         return -EFAULT;
854         }
855
856         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
857
858         if (!ret && oact) {
859                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
860                         return -EFAULT;
861         }
862
863         return ret;
864 }
865
866 /* Invoked by rtrap code to update performance counters in
867  * user space.
868  */
869 asmlinkage void update_perfctrs(void)
870 {
871         unsigned long pic, tmp;
872
873         read_pic(pic);
874         tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
875         __put_user(tmp, current_thread_info()->user_cntd0);
876         tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
877         __put_user(tmp, current_thread_info()->user_cntd1);
878         reset_pic();
879 }
880
881 asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
882 {
883         int err = 0;
884
885         switch(opcode) {
886         case PERFCTR_ON:
887                 current_thread_info()->pcr_reg = arg2;
888                 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
889                 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
890                 current_thread_info()->kernel_cntd0 =
891                         current_thread_info()->kernel_cntd1 = 0;
892                 write_pcr(arg2);
893                 reset_pic();
894                 set_thread_flag(TIF_PERFCTR);
895                 break;
896
897         case PERFCTR_OFF:
898                 err = -EINVAL;
899                 if (test_thread_flag(TIF_PERFCTR)) {
900                         current_thread_info()->user_cntd0 =
901                                 current_thread_info()->user_cntd1 = NULL;
902                         current_thread_info()->pcr_reg = 0;
903                         write_pcr(0);
904                         clear_thread_flag(TIF_PERFCTR);
905                         err = 0;
906                 }
907                 break;
908
909         case PERFCTR_READ: {
910                 unsigned long pic, tmp;
911
912                 if (!test_thread_flag(TIF_PERFCTR)) {
913                         err = -EINVAL;
914                         break;
915                 }
916                 read_pic(pic);
917                 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
918                 err |= __put_user(tmp, current_thread_info()->user_cntd0);
919                 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
920                 err |= __put_user(tmp, current_thread_info()->user_cntd1);
921                 reset_pic();
922                 break;
923         }
924
925         case PERFCTR_CLRPIC:
926                 if (!test_thread_flag(TIF_PERFCTR)) {
927                         err = -EINVAL;
928                         break;
929                 }
930                 current_thread_info()->kernel_cntd0 =
931                         current_thread_info()->kernel_cntd1 = 0;
932                 reset_pic();
933                 break;
934
935         case PERFCTR_SETPCR: {
936                 u64 __user *user_pcr = (u64 __user *)arg0;
937
938                 if (!test_thread_flag(TIF_PERFCTR)) {
939                         err = -EINVAL;
940                         break;
941                 }
942                 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
943                 write_pcr(current_thread_info()->pcr_reg);
944                 current_thread_info()->kernel_cntd0 =
945                         current_thread_info()->kernel_cntd1 = 0;
946                 reset_pic();
947                 break;
948         }
949
950         case PERFCTR_GETPCR: {
951                 u64 __user *user_pcr = (u64 __user *)arg0;
952
953                 if (!test_thread_flag(TIF_PERFCTR)) {
954                         err = -EINVAL;
955                         break;
956                 }
957                 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
958                 break;
959         }
960
961         default:
962                 err = -EINVAL;
963                 break;
964         };
965         return err;
966 }
967
968 /*
969  * Do a system call from kernel instead of calling sys_execve so we
970  * end up with proper pt_regs.
971  */
972 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
973 {
974         long __res;
975         register long __g1 __asm__ ("g1") = __NR_execve;
976         register long __o0 __asm__ ("o0") = (long)(filename);
977         register long __o1 __asm__ ("o1") = (long)(argv);
978         register long __o2 __asm__ ("o2") = (long)(envp);
979         asm volatile ("t 0x6d\n\t"
980                       "sub %%g0, %%o0, %0\n\t"
981                       "movcc %%xcc, %%o0, %0\n\t"
982                       : "=r" (__res), "=&r" (__o0)
983                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
984                       : "cc");
985         return __res;
986 }