Make do_execve() take a const filename pointer
[linux-3.10.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/module.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 void arch_pick_mmap_layout(struct mm_struct *mm)
365 {
366         unsigned long random_factor = 0UL;
367         unsigned long gap;
368
369         if (current->flags & PF_RANDOMIZE) {
370                 random_factor = get_random_int();
371                 if (test_thread_flag(TIF_32BIT))
372                         random_factor &= ((1 * 1024 * 1024) - 1);
373                 else
374                         random_factor = ((random_factor << PAGE_SHIFT) &
375                                          0xffffffffUL);
376         }
377
378         /*
379          * Fall back to the standard layout if the personality
380          * bit is set, or if the expected stack growth is unlimited:
381          */
382         gap = rlimit(RLIMIT_STACK);
383         if (!test_thread_flag(TIF_32BIT) ||
384             (current->personality & ADDR_COMPAT_LAYOUT) ||
385             gap == RLIM_INFINITY ||
386             sysctl_legacy_va_layout) {
387                 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
388                 mm->get_unmapped_area = arch_get_unmapped_area;
389                 mm->unmap_area = arch_unmap_area;
390         } else {
391                 /* We know it's 32-bit */
392                 unsigned long task_size = STACK_TOP32;
393
394                 if (gap < 128 * 1024 * 1024)
395                         gap = 128 * 1024 * 1024;
396                 if (gap > (task_size / 6 * 5))
397                         gap = (task_size / 6 * 5);
398
399                 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
400                 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
401                 mm->unmap_area = arch_unmap_area_topdown;
402         }
403 }
404
405 /*
406  * sys_pipe() is the normal C calling standard for creating
407  * a pipe. It's not the way unix traditionally does this, though.
408  */
409 SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
410 {
411         int fd[2];
412         int error;
413
414         error = do_pipe_flags(fd, 0);
415         if (error)
416                 goto out;
417         regs->u_regs[UREG_I1] = fd[1];
418         error = fd[0];
419 out:
420         return error;
421 }
422
423 /*
424  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
425  *
426  * This is really horribly ugly.
427  */
428
429 SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
430                 unsigned long, third, void __user *, ptr, long, fifth)
431 {
432         long err;
433
434         /* No need for backward compatibility. We can start fresh... */
435         if (call <= SEMCTL) {
436                 switch (call) {
437                 case SEMOP:
438                         err = sys_semtimedop(first, ptr,
439                                              (unsigned)second, NULL);
440                         goto out;
441                 case SEMTIMEDOP:
442                         err = sys_semtimedop(first, ptr, (unsigned)second,
443                                 (const struct timespec __user *)
444                                              (unsigned long) fifth);
445                         goto out;
446                 case SEMGET:
447                         err = sys_semget(first, (int)second, (int)third);
448                         goto out;
449                 case SEMCTL: {
450                         err = sys_semctl(first, second,
451                                          (int)third | IPC_64,
452                                          (union semun) ptr);
453                         goto out;
454                 }
455                 default:
456                         err = -ENOSYS;
457                         goto out;
458                 };
459         }
460         if (call <= MSGCTL) {
461                 switch (call) {
462                 case MSGSND:
463                         err = sys_msgsnd(first, ptr, (size_t)second,
464                                          (int)third);
465                         goto out;
466                 case MSGRCV:
467                         err = sys_msgrcv(first, ptr, (size_t)second, fifth,
468                                          (int)third);
469                         goto out;
470                 case MSGGET:
471                         err = sys_msgget((key_t)first, (int)second);
472                         goto out;
473                 case MSGCTL:
474                         err = sys_msgctl(first, (int)second | IPC_64, ptr);
475                         goto out;
476                 default:
477                         err = -ENOSYS;
478                         goto out;
479                 };
480         }
481         if (call <= SHMCTL) {
482                 switch (call) {
483                 case SHMAT: {
484                         ulong raddr;
485                         err = do_shmat(first, ptr, (int)second, &raddr);
486                         if (!err) {
487                                 if (put_user(raddr,
488                                              (ulong __user *) third))
489                                         err = -EFAULT;
490                         }
491                         goto out;
492                 }
493                 case SHMDT:
494                         err = sys_shmdt(ptr);
495                         goto out;
496                 case SHMGET:
497                         err = sys_shmget(first, (size_t)second, (int)third);
498                         goto out;
499                 case SHMCTL:
500                         err = sys_shmctl(first, (int)second | IPC_64, ptr);
501                         goto out;
502                 default:
503                         err = -ENOSYS;
504                         goto out;
505                 };
506         } else {
507                 err = -ENOSYS;
508         }
509 out:
510         return err;
511 }
512
513 SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
514 {
515         int ret;
516
517         if (current->personality == PER_LINUX32 &&
518             personality == PER_LINUX)
519                 personality = PER_LINUX32;
520         ret = sys_personality(personality);
521         if (ret == PER_LINUX32)
522                 ret = PER_LINUX;
523
524         return ret;
525 }
526
527 int sparc_mmap_check(unsigned long addr, unsigned long len)
528 {
529         if (test_thread_flag(TIF_32BIT)) {
530                 if (len >= STACK_TOP32)
531                         return -EINVAL;
532
533                 if (addr > STACK_TOP32 - len)
534                         return -EINVAL;
535         } else {
536                 if (len >= VA_EXCLUDE_START)
537                         return -EINVAL;
538
539                 if (invalid_64bit_range(addr, len))
540                         return -EINVAL;
541         }
542
543         return 0;
544 }
545
546 /* Linux version of mmap */
547 SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
548                 unsigned long, prot, unsigned long, flags, unsigned long, fd,
549                 unsigned long, off)
550 {
551         unsigned long retval = -EINVAL;
552
553         if ((off + PAGE_ALIGN(len)) < off)
554                 goto out;
555         if (off & ~PAGE_MASK)
556                 goto out;
557         retval = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
558 out:
559         return retval;
560 }
561
562 SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
563 {
564         long ret;
565
566         if (invalid_64bit_range(addr, len))
567                 return -EINVAL;
568
569         down_write(&current->mm->mmap_sem);
570         ret = do_munmap(current->mm, addr, len);
571         up_write(&current->mm->mmap_sem);
572         return ret;
573 }
574
575 extern unsigned long do_mremap(unsigned long addr,
576         unsigned long old_len, unsigned long new_len,
577         unsigned long flags, unsigned long new_addr);
578                 
579 SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
580                 unsigned long, new_len, unsigned long, flags,
581                 unsigned long, new_addr)
582 {
583         unsigned long ret = -EINVAL;
584
585         if (test_thread_flag(TIF_32BIT))
586                 goto out;
587
588         down_write(&current->mm->mmap_sem);
589         ret = do_mremap(addr, old_len, new_len, flags, new_addr);
590         up_write(&current->mm->mmap_sem);
591 out:
592         return ret;       
593 }
594
595 /* we come to here via sys_nis_syscall so it can setup the regs argument */
596 asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
597 {
598         static int count;
599         
600         /* Don't make the system unusable, if someone goes stuck */
601         if (count++ > 5)
602                 return -ENOSYS;
603
604         printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
605 #ifdef DEBUG_UNIMP_SYSCALL      
606         show_regs (regs);
607 #endif
608
609         return -ENOSYS;
610 }
611
612 /* #define DEBUG_SPARC_BREAKPOINT */
613
614 asmlinkage void sparc_breakpoint(struct pt_regs *regs)
615 {
616         siginfo_t info;
617
618         if (test_thread_flag(TIF_32BIT)) {
619                 regs->tpc &= 0xffffffff;
620                 regs->tnpc &= 0xffffffff;
621         }
622 #ifdef DEBUG_SPARC_BREAKPOINT
623         printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
624 #endif
625         info.si_signo = SIGTRAP;
626         info.si_errno = 0;
627         info.si_code = TRAP_BRKPT;
628         info.si_addr = (void __user *)regs->tpc;
629         info.si_trapno = 0;
630         force_sig_info(SIGTRAP, &info, current);
631 #ifdef DEBUG_SPARC_BREAKPOINT
632         printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
633 #endif
634 }
635
636 extern void check_pending(int signum);
637
638 SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
639 {
640         int nlen, err;
641
642         if (len < 0)
643                 return -EINVAL;
644
645         down_read(&uts_sem);
646         
647         nlen = strlen(utsname()->domainname) + 1;
648         err = -EINVAL;
649         if (nlen > len)
650                 goto out;
651
652         err = -EFAULT;
653         if (!copy_to_user(name, utsname()->domainname, nlen))
654                 err = 0;
655
656 out:
657         up_read(&uts_sem);
658         return err;
659 }
660
661 SYSCALL_DEFINE5(utrap_install, utrap_entry_t, type,
662                 utrap_handler_t, new_p, utrap_handler_t, new_d,
663                 utrap_handler_t __user *, old_p,
664                 utrap_handler_t __user *, old_d)
665 {
666         if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
667                 return -EINVAL;
668         if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
669                 if (old_p) {
670                         if (!current_thread_info()->utraps) {
671                                 if (put_user(NULL, old_p))
672                                         return -EFAULT;
673                         } else {
674                                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
675                                         return -EFAULT;
676                         }
677                 }
678                 if (old_d) {
679                         if (put_user(NULL, old_d))
680                                 return -EFAULT;
681                 }
682                 return 0;
683         }
684         if (!current_thread_info()->utraps) {
685                 current_thread_info()->utraps =
686                         kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
687                 if (!current_thread_info()->utraps)
688                         return -ENOMEM;
689                 current_thread_info()->utraps[0] = 1;
690         } else {
691                 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
692                     current_thread_info()->utraps[0] > 1) {
693                         unsigned long *p = current_thread_info()->utraps;
694
695                         current_thread_info()->utraps =
696                                 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
697                                         GFP_KERNEL);
698                         if (!current_thread_info()->utraps) {
699                                 current_thread_info()->utraps = p;
700                                 return -ENOMEM;
701                         }
702                         p[0]--;
703                         current_thread_info()->utraps[0] = 1;
704                         memcpy(current_thread_info()->utraps+1, p+1,
705                                UT_TRAP_INSTRUCTION_31*sizeof(long));
706                 }
707         }
708         if (old_p) {
709                 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
710                         return -EFAULT;
711         }
712         if (old_d) {
713                 if (put_user(NULL, old_d))
714                         return -EFAULT;
715         }
716         current_thread_info()->utraps[type] = (long)new_p;
717
718         return 0;
719 }
720
721 asmlinkage long sparc_memory_ordering(unsigned long model,
722                                       struct pt_regs *regs)
723 {
724         if (model >= 3)
725                 return -EINVAL;
726         regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
727         return 0;
728 }
729
730 SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
731                 struct sigaction __user *, oact, void __user *, restorer,
732                 size_t, sigsetsize)
733 {
734         struct k_sigaction new_ka, old_ka;
735         int ret;
736
737         /* XXX: Don't preclude handling different sized sigset_t's.  */
738         if (sigsetsize != sizeof(sigset_t))
739                 return -EINVAL;
740
741         if (act) {
742                 new_ka.ka_restorer = restorer;
743                 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
744                         return -EFAULT;
745         }
746
747         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
748
749         if (!ret && oact) {
750                 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
751                         return -EFAULT;
752         }
753
754         return ret;
755 }
756
757 /*
758  * Do a system call from kernel instead of calling sys_execve so we
759  * end up with proper pt_regs.
760  */
761 int kernel_execve(const char *filename,
762                   const char *const argv[],
763                   const char *const envp[])
764 {
765         long __res;
766         register long __g1 __asm__ ("g1") = __NR_execve;
767         register long __o0 __asm__ ("o0") = (long)(filename);
768         register long __o1 __asm__ ("o1") = (long)(argv);
769         register long __o2 __asm__ ("o2") = (long)(envp);
770         asm volatile ("t 0x6d\n\t"
771                       "sub %%g0, %%o0, %0\n\t"
772                       "movcc %%xcc, %%o0, %0\n\t"
773                       : "=r" (__res), "=&r" (__o0)
774                       : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
775                       : "cc");
776         return __res;
777 }