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WMI: fix potential NULL pointer dereference
[linux-2.6/x86.git] / arch / sparc / kernel / sys_sparc_64.c
blobf836f4e93afe08b66f37955084896abeb82a8a0a
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 }
x86 "subsystem" repository