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sparc64: Sharpen address space randomization calculations.
[deliverable/linux.git] / arch / sparc / kernel / sys_sparc_64.c
CommitLineData
207ddd0a 1/* linux/arch/sparc64/kernel/sys_sparc.c
1da177e4
LT		 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
1da177e4
LT		 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>
1da177e4
LT		 21#include <linux/slab.h>
22#include <linux/syscalls.h>
23#include <linux/ipc.h>
24#include <linux/personality.h>
05f9ca83 25#include <linux/random.h>
917c3660 26#include <linux/module.h>
1da177e4
LT		 27
28#include <asm/uaccess.h>
1da177e4 29#include <asm/utrap.h>
fe74290d 30#include <asm/unistd.h>
1da177e4 31
207ddd0a
DM		 32#include "entry.h"
33#include "systbls.h"
34
1da177e4
LT		 35/* #define DEBUG_UNIMP_SYSCALL */
36
1da177e4
LT		 37asmlinkage unsigned long sys_getpagesize(void)
38{
39 return PAGE_SIZE;
40}
41
8bcd1741
DM		 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 */
48static 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? */
70static 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
a91690dd
DM		 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
95static 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
104static 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}
1da177e4
LT		 114
115unsigned 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))
d61e16df 134 task_size = STACK_TOP32;
a91690dd 135 if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
1da177e4
LT		 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
a91690dd
DM		 154 if (len > mm->cached_hole_size) {
155 start_addr = addr = mm->free_area_cache;
156 } else {
157 start_addr = addr = TASK_UNMAPPED_BASE;
1363c3cd 158 mm->cached_hole_size = 0;
1363c3cd 159 }
1da177e4
LT		 160
161 task_size -= len;
162
163full_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). */
8bcd1741
DM		 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);
1da177e4 175 }
a91690dd 176 if (unlikely(task_size < addr)) {
1da177e4
LT		 177 if (start_addr != TASK_UNMAPPED_BASE) {
178 start_addr = addr = TASK_UNMAPPED_BASE;
1363c3cd 179 mm->cached_hole_size = 0;
1da177e4
LT		 180 goto full_search;
181 }
182 return -ENOMEM;
183 }
a91690dd 184 if (likely(!vma || addr + len <= vma->vm_start)) {
1da177e4
LT		 185 /*
186 * Remember the place where we stopped the search:
187 */
188 mm->free_area_cache = addr + len;
189 return addr;
190 }
1363c3cd
WW		 191 if (addr + mm->cached_hole_size < vma->vm_start)
192 mm->cached_hole_size = vma->vm_start - addr;
193
1da177e4
LT		 194 addr = vma->vm_end;
195 if (do_color_align)
196 addr = COLOUR_ALIGN(addr, pgoff);
197 }
198}
199
a91690dd
DM		 200unsigned long
201arch_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;
d61e16df 207 unsigned long task_size = STACK_TOP32;
a91690dd
DM		 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
296bottomup:
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
1da177e4
LT		 315/* Try to align mapping such that we align it as much as possible. */
316unsigned 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;
c4caa778
AV		 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;
1da177e4
LT		 323
324 if (flags & MAP_FIXED) {
325 /* Ok, don't mess with it. */
c4caa778 326 return get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4
LT		 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 {
c4caa778 339 addr = get_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
1da177e4
LT		 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)
c4caa778 357 addr = get_area(NULL, orig_addr, len, pgoff, flags);
1da177e4
LT		 358
359 return addr;
360}
917c3660 361EXPORT_SYMBOL(get_fb_unmapped_area);
1da177e4 362
5a0efea0
DM		 363/* Essentially the same as PowerPC. */
364static unsigned long mmap_rnd(void)
a91690dd 365{
5a0efea0 366 unsigned long rnd = 0UL;
05f9ca83
DM		 367
368 if (current->flags & PF_RANDOMIZE) {
5a0efea0 369 unsigned long val = get_random_int();
05f9ca83 370 if (test_thread_flag(TIF_32BIT))
5a0efea0 371 rnd = (val % (1UL << (22UL-PAGE_SHIFT)));
05f9ca83 372 else
5a0efea0 373 rnd = (val % (1UL << (29UL-PAGE_SHIFT)));
05f9ca83 374 }
5a0efea0
DM		 375 return (rnd << PAGE_SHIFT) * 2;
376}
377
378void arch_pick_mmap_layout(struct mm_struct *mm)
379{
380 unsigned long random_factor = mmap_rnd();
381 unsigned long gap;
05f9ca83 382
a91690dd
DM		 383 /*
384 * Fall back to the standard layout if the personality
385 * bit is set, or if the expected stack growth is unlimited:
386 */
76704fb5 387 gap = rlimit(RLIMIT_STACK);
a91690dd
DM		 388 if (!test_thread_flag(TIF_32BIT) ||
389 (current->personality & ADDR_COMPAT_LAYOUT) ||
76704fb5 390 gap == RLIM_INFINITY ||
a91690dd 391 sysctl_legacy_va_layout) {
05f9ca83 392 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
a91690dd
DM		 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 */
d61e16df 397 unsigned long task_size = STACK_TOP32;
a91690dd 398
a91690dd
DM		 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
05f9ca83 404 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
a91690dd
DM		 405 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
406 mm->unmap_area = arch_unmap_area_topdown;
407 }
408}
409
1da177e4
LT		 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 */
e4265019 414SYSCALL_DEFINE1(sparc_pipe_real, struct pt_regs *, regs)
1da177e4
LT		 415{
416 int fd[2];
417 int error;
418
ed8cae8b 419 error = do_pipe_flags(fd, 0);
1da177e4
LT		 420 if (error)
421 goto out;
422 regs->u_regs[UREG_I1] = fd[1];
423 error = fd[0];
424out:
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
baed7fc9 434SYSCALL_DEFINE6(sparc_ipc, unsigned int, call, int, first, unsigned long, second,
e4265019 435 unsigned long, third, void __user *, ptr, long, fifth)
1da177e4 436{
7379b42b 437 long err;
1da177e4
LT		 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,
207ddd0a
DM		 448 (const struct timespec __user *)
449 (unsigned long) fifth);
1da177e4
LT		 450 goto out;
451 case SEMGET:
452 err = sys_semget(first, (int)second, (int)third);
453 goto out;
454 case SEMCTL: {
020cfb05
DM		 455 err = sys_semctl(first, second,
456 (int)third | IPC_64,
7379b42b 457 (union semun) ptr);
1da177e4
LT		 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 }
514out:
515 return err;
516}
517
e4265019 518SYSCALL_DEFINE1(sparc64_personality, unsigned long, personality)
1da177e4
LT		 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
f92ffa12 532int sparc_mmap_check(unsigned long addr, unsigned long len)
3a459756
KK		 533{
534 if (test_thread_flag(TIF_32BIT)) {
535 if (len >= STACK_TOP32)
536 return -EINVAL;
537
58163393 538 if (addr > STACK_TOP32 - len)
3a459756
KK		 539 return -EINVAL;
540 } else {
541 if (len >= VA_EXCLUDE_START)
542 return -EINVAL;
543
58163393 544 if (invalid_64bit_range(addr, len))
3a459756
KK		 545 return -EINVAL;
546 }
547
548 return 0;
549}
550
1da177e4 551/* Linux version of mmap */
e4265019
DM		 552SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
553 unsigned long, prot, unsigned long, flags, unsigned long, fd,
554 unsigned long, off)
1da177e4 555{
f8b72560 556 unsigned long retval = -EINVAL;
1da177e4 557
f8b72560
AV		 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);
1da177e4
LT		 563out:
564 return retval;
565}
566
e4265019 567SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
1da177e4
LT		 568{
569 long ret;
570
8bcd1741 571 if (invalid_64bit_range(addr, len))
1da177e4 572 return -EINVAL;
8bcd1741 573
1da177e4
LT		 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
580extern 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
e4265019
DM		 584SYSCALL_DEFINE5(64_mremap, unsigned long, addr, unsigned long, old_len,
585 unsigned long, new_len, unsigned long, flags,
586 unsigned long, new_addr)
1da177e4 587{
1da177e4 588 unsigned long ret = -EINVAL;
8bcd1741 589
1da177e4
LT		 590 if (test_thread_flag(TIF_32BIT))
591 goto out;
8bcd1741 592
1da177e4 593 down_write(&current->mm->mmap_sem);
1da177e4 594 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
1da177e4
LT		 595 up_write(&current->mm->mmap_sem);
596out:
597 return ret;
598}
599
600/* we come to here via sys_nis_syscall so it can setup the regs argument */
601asmlinkage 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
619asmlinkage 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
641extern void check_pending(int signum);
642
e4265019 643SYSCALL_DEFINE2(getdomainname, char __user *, name, int, len)
1da177e4 644{
8310a32c
DM		 645 int nlen, err;
646
b9c54f91 647 if (len < 0)
8310a32c 648 return -EINVAL;
1da177e4
LT		 649
650 down_read(&uts_sem);
651
e9ff3990 652 nlen = strlen(utsname()->domainname) + 1;
b9c54f91
AW		 653 err = -EINVAL;
654 if (nlen > len)
655 goto out;
8310a32c
DM		 656
657 err = -EFAULT;
e9ff3990 658 if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c
DM		 659 err = 0;
660
b9c54f91 661out:
1da177e4
LT		 662 up_read(&uts_sem);
663 return err;
664}
665
e4265019
DM		 666SYSCALL_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)
1da177e4
LT		 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 =
9132983a 691 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
1da177e4
LT		 692 if (!current_thread_info()->utraps)
693 return -ENOMEM;
694 current_thread_info()->utraps[0] = 1;
1da177e4
LT		 695 } else {
696 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
697 current_thread_info()->utraps[0] > 1) {
207ddd0a 698 unsigned long *p = current_thread_info()->utraps;
1da177e4
LT		 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
207ddd0a
DM		 726asmlinkage long sparc_memory_ordering(unsigned long model,
727 struct pt_regs *regs)
1da177e4
LT		 728{
729 if (model >= 3)
730 return -EINVAL;
731 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
732 return 0;
733}
734
e4265019
DM		 735SYSCALL_DEFINE5(rt_sigaction, int, sig, const struct sigaction __user *, act,
736 struct sigaction __user *, oact, void __user *, restorer,
737 size_t, sigsetsize)
1da177e4
LT		 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
fe74290d
AB		 762/*
763 * Do a system call from kernel instead of calling sys_execve so we
764 * end up with proper pt_regs.
765 */
d7627467
DH		 766int kernel_execve(const char *filename,
767 const char *const argv[],
768 const char *const envp[])
fe74290d
AB		 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}
Linux kernel - Deliverables
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