232df9949530f3d95c3c95385a62d45402c6d042
[linux-2.6.git] / arch / sparc / kernel / sys_sparc_64.c
1 /* linux/arch/sparc64/kernel/sys_sparc.c
2  *
3  * This file contains various random system calls that
4  * have a non-standard calling sequence on the Linux/sparc
5  * platform.
6  */
7
8 #include <linux/errno.h>
9 #include <linux/types.h>
10 #include <linux/sched.h>
11 #include <linux/fs.h>
12 #include <linux/file.h>
13 #include <linux/mm.h>
14 #include <linux/sem.h>
15 #include <linux/msg.h>
16 #include <linux/shm.h>
17 #include <linux/stat.h>
18 #include <linux/mman.h>
19 #include <linux/utsname.h>
20 #include <linux/smp.h>
21 #include <linux/slab.h>
22 #include <linux/syscalls.h>
23 #include <linux/ipc.h>
24 #include <linux/personality.h>
25 #include <linux/random.h>
26 #include <linux/export.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/utrap.h>
30 #include <asm/unistd.h>
31
32 #include "entry.h"
33 #include "systbls.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         unsigned long (*get_area)(struct file *, unsigned long,
320                                   unsigned long, unsigned long, unsigned long);
321
322         get_area = current->mm->get_unmapped_area;
323
324         if (flags & MAP_FIXED) {
325                 /* Ok, don't mess with it. */
326                 return get_area(NULL, orig_addr, len, pgoff, flags);
327         }
328         flags &= ~MAP_SHARED;
329
330         align_goal = PAGE_SIZE;
331         if (len >= (4UL * 1024 * 1024))
332                 align_goal = (4UL * 1024 * 1024);
333         else if (len >= (512UL * 1024))
334                 align_goal = (512UL * 1024);
335         else if (len >= (64UL * 1024))
336                 align_goal = (64UL * 1024);
337
338         do {
339                 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
340                 if (!(addr & ~PAGE_MASK)) {
341                         addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
342                         break;
343                 }
344
345                 if (align_goal == (4UL * 1024 * 1024))
346                         align_goal = (512UL * 1024);
347                 else if (align_goal == (512UL * 1024))
348                         align_goal = (64UL * 1024);
349                 else
350                         align_goal = PAGE_SIZE;
351         } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
352
353         /* Mapping is smaller than 64K or larger areas could not
354          * be obtained.
355          */
356         if (addr & ~PAGE_MASK)
357                 addr = get_area(NULL, orig_addr, len, pgoff, flags);
358
359         return addr;
360 }
361 EXPORT_SYMBOL(get_fb_unmapped_area);
362
363 /* Essentially the same as PowerPC.  */
364 static unsigned long mmap_rnd(void)
365 {
366         unsigned long rnd = 0UL;
367
368         if (current->flags & PF_RANDOMIZE) {
369                 unsigned long val = get_random_int();
370                 if (test_thread_flag(TIF_32BIT))
371                         rnd = (val % (1UL << (23UL-PAGE_SHIFT)));
372                 else
373                         rnd = (val % (1UL << (30UL-PAGE_SHIFT)));
374         }
375         return rnd << PAGE_SHIFT;
376 }
377
378 void arch_pick_mmap_layout(struct mm_struct *mm)
379 {
380         unsigned long random_factor = mmap_rnd();
381         unsigned long gap;
382
383         /*
384          * Fall back to the standard layout if the personality
385          * bit is set, or if the expected stack growth is unlimited:
386          */
387         gap = rlimit(RLIMIT_STACK);
388         if (!test_thread_flag(TIF_32BIT) ||
389             (current->personality & ADDR_COMPAT_LAYOUT) ||
390             gap == RLIM_INFINITY ||
391             sysctl_legacy_va_layout) {
392                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
393                 mm->get_unmapped_area = arch_get_unmapped_area;
394                 mm->unmap_area = arch_unmap_area;
395         } else {
396                 /* We know it's 32-bit */
397                 unsigned long task_size = STACK_TOP32;
398
399                 if (gap < 128 * 1024 * 1024)
400                         gap = 128 * 1024 * 1024;
401                 if (gap > (task_size / 6 * 5))
402                         gap = (task_size / 6 * 5);
403
404                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
405                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
406                 mm->unmap_area = arch_unmap_area_topdown;
407         }
408 }
409
410 /*
411  * sys_pipe() is the normal C calling standard for creating
412  * a pipe. It's not the way unix traditionally does this, though.
413  */
414 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
415 {
416         int fd[2];
417         int error;
418
419         error = do_pipe_flags(fd, 0);
420         if (error)
421                 goto out;
422         regs->u_regs[UREG_I1] = fd[1];
423         error = fd[0];
424 out:
425         return error;
426 }
427
428 /*
429  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
430  *
431  * This is really horribly ugly.
432  */
433
434 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
435                 unsigned long, third, void __user *, ptr, long, fifth)
436 {
437         long err;
438
439         /* No need for backward compatibility. We can start fresh... */
440         if (call <= SEMCTL) {
441                 switch (call) {
442                 case SEMOP:
443                         err = sys_semtimedop(first, ptr,
444                                              (unsigned)second, NULL);
445                         goto out;
446                 case SEMTIMEDOP:
447                         err = sys_semtimedop(first, ptr, (unsigned)second,
448                                 (const struct timespec __user *)
449                                              (unsigned long) fifth);
450                         goto out;
451                 case SEMGET:
452                         err = sys_semget(first, (int)second, (int)third);
453                         goto out;
454                 case SEMCTL: {
455                         err = sys_semctl(first, second,
456                                          (int)third | IPC_64,
457                                          (union semun) ptr);
458                         goto out;
459                 }
460                 default:
461                         err = -ENOSYS;
462                         goto out;
463                 }
464         }
465         if (call <= MSGCTL) {
466                 switch (call) {
467                 case MSGSND:
468                         err = sys_msgsnd(first, ptr, (size_t)second,
469                                          (int)third);
470                         goto out;
471                 case MSGRCV:
472                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
473                                          (int)third);
474                         goto out;
475                 case MSGGET:
476                         err = sys_msgget((key_t)first, (int)second);
477                         goto out;
478                 case MSGCTL:
479                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
480                         goto out;
481                 default:
482                         err = -ENOSYS;
483                         goto out;
484                 }
485         }
486         if (call <= SHMCTL) {
487                 switch (call) {
488                 case SHMAT: {
489                         ulong raddr;
490                         err = do_shmat(first, ptr, (int)second, &raddr);
491                         if (!err) {
492                                 if (put_user(raddr,
493                                              (ulong __user *) third))
494                                         err = -EFAULT;
495                         }
496                         goto out;
497                 }
498                 case SHMDT:
499                         err = sys_shmdt(ptr);
500                         goto out;
501                 case SHMGET:
502                         err = sys_shmget(first, (size_t)second, (int)third);
503                         goto out;
504                 case SHMCTL:
505                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
506                         goto out;
507                 default:
508                         err = -ENOSYS;
509                         goto out;
510                 }
511         } else {
512                 err = -ENOSYS;
513         }
514 out:
515         return err;
516 }
517
518 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
519 {
520         int ret;
521
522         if (current->personality == PER_LINUX32 &&
523             personality == PER_LINUX)
524                 personality = PER_LINUX32;
525         ret = sys_personality(personality);
526         if (ret == PER_LINUX32)
527                 ret = PER_LINUX;
528
529         return ret;
530 }
531
532 int sparc_mmap_check(unsigned long addr, unsigned long len)
533 {
534         if (test_thread_flag(TIF_32BIT)) {
535                 if (len >= STACK_TOP32)
536                         return -EINVAL;
537
538                 if (addr > STACK_TOP32 - len)
539                         return -EINVAL;
540         } else {
541                 if (len >= VA_EXCLUDE_START)
542                         return -EINVAL;
543
544                 if (invalid_64bit_range(addr, len))
545                         return -EINVAL;
546         }
547
548         return 0;
549 }
550
551 /* Linux version of mmap */
552 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
553                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
554                 unsigned long, off)
555 {
556         unsigned long retval = -EINVAL;
557
558         if ((off + PAGE_ALIGN(len)) < off)
559                 goto out;
560         if (off & ~PAGE_MASK)
561                 goto out;
562         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
563 out:
564         return retval;
565 }
566
567 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
568 {
569         long ret;
570
571         if (invalid_64bit_range(addr, len))
572                 return -EINVAL;
573
574         down_write(&current->mm->mmap_sem);
575         ret = do_munmap(current->mm, addr, len);
576         up_write(&current->mm->mmap_sem);
577         return ret;
578 }
579
580 extern unsigned long do_mremap(unsigned long addr,
581         unsigned long old_len, unsigned long new_len,
582         unsigned long flags, unsigned long new_addr);
583                 
584 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
585                 unsigned long, new_len, unsigned long, flags,
586                 unsigned long, new_addr)
587 {
588         unsigned long ret = -EINVAL;
589
590         if (test_thread_flag(TIF_32BIT))
591                 goto out;
592
593         down_write(&current->mm->mmap_sem);
594         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
595         up_write(&current->mm->mmap_sem);
596 out:
597         return ret;       
598 }
599
600 /* we come to here via sys_nis_syscall so it can setup the regs argument */
601 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
602 {
603         static int count;
604         
605         /* Don't make the system unusable, if someone goes stuck */
606         if (count++ > 5)
607                 return -ENOSYS;
608
609         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
610 #ifdef DEBUG_UNIMP_SYSCALL      
611         show_regs (regs);
612 #endif
613
614         return -ENOSYS;
615 }
616
617 /* #define DEBUG_SPARC_BREAKPOINT */
618
619 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
620 {
621         siginfo_t info;
622
623         if (test_thread_flag(TIF_32BIT)) {
624                 regs->tpc &= 0xffffffff;
625                 regs->tnpc &= 0xffffffff;
626         }
627 #ifdef DEBUG_SPARC_BREAKPOINT
628         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
629 #endif
630         info.si_signo = SIGTRAP;
631         info.si_errno = 0;
632         info.si_code = TRAP_BRKPT;
633         info.si_addr = (void __user *)regs->tpc;
634         info.si_trapno = 0;
635         force_sig_info(SIGTRAP, &info, current);
636 #ifdef DEBUG_SPARC_BREAKPOINT
637         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
638 #endif
639 }
640
641 extern void check_pending(int signum);
642
643 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
644 {
645         int nlen, err;
646
647         if (len < 0)
648                 return -EINVAL;
649
650         down_read(&uts_sem);
651         
652         nlen = strlen(utsname()->domainname) + 1;
653         err = -EINVAL;
654         if (nlen > len)
655                 goto out;
656
657         err = -EFAULT;
658         if (!copy_to_user(name, utsname()->domainname, nlen))
659                 err = 0;
660
661 out:
662         up_read(&uts_sem);
663         return err;
664 }
665
666 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
667                 utrap_handler_t, new_p, utrap_handler_t, new_d,
668                 utrap_handler_t __user *, old_p,
669                 utrap_handler_t __user *, old_d)
670 {
671         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
672                 return -EINVAL;
673         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
674                 if (old_p) {
675                         if (!current_thread_info()->utraps) {
676                                 if (put_user(NULL, old_p))
677                                         return -EFAULT;
678                         } else {
679                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
680                                         return -EFAULT;
681                         }
682                 }
683                 if (old_d) {
684                         if (put_user(NULL, old_d))
685                                 return -EFAULT;
686                 }
687                 return 0;
688         }
689         if (!current_thread_info()->utraps) {
690                 current_thread_info()->utraps =
691                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
692                 if (!current_thread_info()->utraps)
693                         return -ENOMEM;
694                 current_thread_info()->utraps[0] = 1;
695         } else {
696                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
697                     current_thread_info()->utraps[0] > 1) {
698                         unsigned long *p = current_thread_info()->utraps;
699
700                         current_thread_info()->utraps =
701                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
702                                         GFP_KERNEL);
703                         if (!current_thread_info()->utraps) {
704                                 current_thread_info()->utraps = p;
705                                 return -ENOMEM;
706                         }
707                         p[0]--;
708                         current_thread_info()->utraps[0] = 1;
709                         memcpy(current_thread_info()->utraps+1, p+1,
710                                UT_TRAP_INSTRUCTION_31*sizeof(long));
711                 }
712         }
713         if (old_p) {
714                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
715                         return -EFAULT;
716         }
717         if (old_d) {
718                 if (put_user(NULL, old_d))
719                         return -EFAULT;
720         }
721         current_thread_info()->utraps[type] = (long)new_p;
722
723         return 0;
724 }
725
726 asmlinkage long sparc_memory_ordering(unsigned long model,
727                                       struct pt_regs *regs)
728 {
729         if (model >= 3)
730                 return -EINVAL;
731         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
732         return 0;
733 }
734
735 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
736                 struct sigaction __user *, oact, void __user *, restorer,
737                 size_t, sigsetsize)
738 {
739         struct k_sigaction new_ka, old_ka;
740         int ret;
741
742         /* XXX: Don't preclude handling different sized sigset_t's.  */
743         if (sigsetsize != sizeof(sigset_t))
744                 return -EINVAL;
745
746         if (act) {
747                 new_ka.ka_restorer = restorer;
748                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
749                         return -EFAULT;
750         }
751
752         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
753
754         if (!ret && oact) {
755                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
756                         return -EFAULT;
757         }
758
759         return ret;
760 }
761
762 /*
763  * Do a system call from kernel instead of calling sys_execve so we
764  * end up with proper pt_regs.
765  */
766 int kernel_execve(const char *filename,
767                   const char *const argv[],
768                   const char *const envp[])
769 {
770         long __res;
771         register long __g1 __asm__ ("g1") = __NR_execve;
772         register long __o0 __asm__ ("o0") = (long)(filename);
773         register long __o1 __asm__ ("o1") = (long)(argv);
774         register long __o2 __asm__ ("o2") = (long)(envp);
775         asm volatile ("t 0x6d\n\t"
776                       "sub %%g0, %%o0, %0\n\t"
777                       "movcc %%xcc, %%o0, %0\n\t"
778                       : "=r" (__res), "=&r" (__o0)
779                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
780                       : "cc");
781         return __res;
782 }