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Make 'cond_resched()' nullification depend on PREEMPT_BKL
[deliverable/linux.git] / arch / sparc64 / kernel / sys_sparc.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>
1da177e4
LT		 26
27#include <asm/uaccess.h>
1da177e4
LT		 28#include <asm/utrap.h>
29#include <asm/perfctr.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;
319
320 if (flags & MAP_FIXED) {
321 /* Ok, don't mess with it. */
d58aa8c7 322 return get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
1da177e4
LT		 323 }
324 flags &= ~MAP_SHARED;
325
326 align_goal = PAGE_SIZE;
327 if (len >= (4UL * 1024 * 1024))
328 align_goal = (4UL * 1024 * 1024);
329 else if (len >= (512UL * 1024))
330 align_goal = (512UL * 1024);
331 else if (len >= (64UL * 1024))
332 align_goal = (64UL * 1024);
333
334 do {
335 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
336 if (!(addr & ~PAGE_MASK)) {
337 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
338 break;
339 }
340
341 if (align_goal == (4UL * 1024 * 1024))
342 align_goal = (512UL * 1024);
343 else if (align_goal == (512UL * 1024))
344 align_goal = (64UL * 1024);
345 else
346 align_goal = PAGE_SIZE;
347 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
348
349 /* Mapping is smaller than 64K or larger areas could not
350 * be obtained.
351 */
352 if (addr & ~PAGE_MASK)
353 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
354
355 return addr;
356}
357
a91690dd
DM		 358/* Essentially the same as PowerPC... */
359void arch_pick_mmap_layout(struct mm_struct *mm)
360{
05f9ca83
DM		 361 unsigned long random_factor = 0UL;
362
363 if (current->flags & PF_RANDOMIZE) {
364 random_factor = get_random_int();
365 if (test_thread_flag(TIF_32BIT))
366 random_factor &= ((1 * 1024 * 1024) - 1);
367 else
368 random_factor = ((random_factor << PAGE_SHIFT) &
369 0xffffffffUL);
370 }
371
a91690dd
DM		 372 /*
373 * Fall back to the standard layout if the personality
374 * bit is set, or if the expected stack growth is unlimited:
375 */
376 if (!test_thread_flag(TIF_32BIT) ||
377 (current->personality & ADDR_COMPAT_LAYOUT) ||
378 current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
379 sysctl_legacy_va_layout) {
05f9ca83 380 mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
a91690dd
DM		 381 mm->get_unmapped_area = arch_get_unmapped_area;
382 mm->unmap_area = arch_unmap_area;
383 } else {
384 /* We know it's 32-bit */
d61e16df 385 unsigned long task_size = STACK_TOP32;
a91690dd
DM		 386 unsigned long gap;
387
388 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
389 if (gap < 128 * 1024 * 1024)
390 gap = 128 * 1024 * 1024;
391 if (gap > (task_size / 6 * 5))
392 gap = (task_size / 6 * 5);
393
05f9ca83 394 mm->mmap_base = PAGE_ALIGN(task_size - gap - random_factor);
a91690dd
DM		 395 mm->get_unmapped_area = arch_get_unmapped_area_topdown;
396 mm->unmap_area = arch_unmap_area_topdown;
397 }
398}
399
1da177e4
LT		 400asmlinkage unsigned long sparc_brk(unsigned long brk)
401{
402 /* People could try to be nasty and use ta 0x6d in 32bit programs */
d61e16df 403 if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
1da177e4
LT		 404 return current->mm->brk;
405
8bcd1741 406 if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
1da177e4 407 return current->mm->brk;
8bcd1741 408
1da177e4
LT		 409 return sys_brk(brk);
410}
411
412/*
413 * sys_pipe() is the normal C calling standard for creating
414 * a pipe. It's not the way unix traditionally does this, though.
415 */
416asmlinkage long sparc_pipe(struct pt_regs *regs)
417{
418 int fd[2];
419 int error;
420
421 error = do_pipe(fd);
422 if (error)
423 goto out;
424 regs->u_regs[UREG_I1] = fd[1];
425 error = fd[0];
426out:
427 return error;
428}
429
430/*
431 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
432 *
433 * This is really horribly ugly.
434 */
435
436asmlinkage long sys_ipc(unsigned int call, int first, unsigned long second,
437 unsigned long third, void __user *ptr, long fifth)
438{
7379b42b 439 long err;
1da177e4
LT		 440
441 /* No need for backward compatibility. We can start fresh... */
442 if (call <= SEMCTL) {
443 switch (call) {
444 case SEMOP:
445 err = sys_semtimedop(first, ptr,
446 (unsigned)second, NULL);
447 goto out;
448 case SEMTIMEDOP:
449 err = sys_semtimedop(first, ptr, (unsigned)second,
207ddd0a
DM		 450 (const struct timespec __user *)
451 (unsigned long) fifth);
1da177e4
LT		 452 goto out;
453 case SEMGET:
454 err = sys_semget(first, (int)second, (int)third);
455 goto out;
456 case SEMCTL: {
020cfb05
DM		 457 err = sys_semctl(first, second,
458 (int)third | IPC_64,
7379b42b 459 (union semun) ptr);
1da177e4
LT		 460 goto out;
461 }
462 default:
463 err = -ENOSYS;
464 goto out;
465 };
466 }
467 if (call <= MSGCTL) {
468 switch (call) {
469 case MSGSND:
470 err = sys_msgsnd(first, ptr, (size_t)second,
471 (int)third);
472 goto out;
473 case MSGRCV:
474 err = sys_msgrcv(first, ptr, (size_t)second, fifth,
475 (int)third);
476 goto out;
477 case MSGGET:
478 err = sys_msgget((key_t)first, (int)second);
479 goto out;
480 case MSGCTL:
481 err = sys_msgctl(first, (int)second | IPC_64, ptr);
482 goto out;
483 default:
484 err = -ENOSYS;
485 goto out;
486 };
487 }
488 if (call <= SHMCTL) {
489 switch (call) {
490 case SHMAT: {
491 ulong raddr;
492 err = do_shmat(first, ptr, (int)second, &raddr);
493 if (!err) {
494 if (put_user(raddr,
495 (ulong __user *) third))
496 err = -EFAULT;
497 }
498 goto out;
499 }
500 case SHMDT:
501 err = sys_shmdt(ptr);
502 goto out;
503 case SHMGET:
504 err = sys_shmget(first, (size_t)second, (int)third);
505 goto out;
506 case SHMCTL:
507 err = sys_shmctl(first, (int)second | IPC_64, ptr);
508 goto out;
509 default:
510 err = -ENOSYS;
511 goto out;
512 };
513 } else {
514 err = -ENOSYS;
515 }
516out:
517 return err;
518}
519
520asmlinkage long sparc64_newuname(struct new_utsname __user *name)
521{
522 int ret = sys_newuname(name);
523
524 if (current->personality == PER_LINUX32 && !ret) {
525 ret = (copy_to_user(name->machine, "sparc\0\0", 8)
526 ? -EFAULT : 0);
527 }
528 return ret;
529}
530
531asmlinkage long sparc64_personality(unsigned long personality)
532{
533 int ret;
534
535 if (current->personality == PER_LINUX32 &&
536 personality == PER_LINUX)
537 personality = PER_LINUX32;
538 ret = sys_personality(personality);
539 if (ret == PER_LINUX32)
540 ret = PER_LINUX;
541
542 return ret;
543}
544
3a459756
KK		 545int sparc64_mmap_check(unsigned long addr, unsigned long len,
546 unsigned long flags)
547{
548 if (test_thread_flag(TIF_32BIT)) {
549 if (len >= STACK_TOP32)
550 return -EINVAL;
551
58163393 552 if (addr > STACK_TOP32 - len)
3a459756
KK		 553 return -EINVAL;
554 } else {
555 if (len >= VA_EXCLUDE_START)
556 return -EINVAL;
557
58163393 558 if (invalid_64bit_range(addr, len))
3a459756
KK		 559 return -EINVAL;
560 }
561
562 return 0;
563}
564
1da177e4
LT		 565/* Linux version of mmap */
566asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
567 unsigned long prot, unsigned long flags, unsigned long fd,
568 unsigned long off)
569{
570 struct file * file = NULL;
571 unsigned long retval = -EBADF;
572
573 if (!(flags & MAP_ANONYMOUS)) {
574 file = fget(fd);
575 if (!file)
576 goto out;
577 }
578 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
579 len = PAGE_ALIGN(len);
1da177e4
LT		 580
581 down_write(&current->mm->mmap_sem);
582 retval = do_mmap(file, addr, len, prot, flags, off);
583 up_write(&current->mm->mmap_sem);
584
1da177e4
LT		 585 if (file)
586 fput(file);
587out:
588 return retval;
589}
590
591asmlinkage long sys64_munmap(unsigned long addr, size_t len)
592{
593 long ret;
594
8bcd1741 595 if (invalid_64bit_range(addr, len))
1da177e4 596 return -EINVAL;
8bcd1741 597
1da177e4
LT		 598 down_write(&current->mm->mmap_sem);
599 ret = do_munmap(current->mm, addr, len);
600 up_write(&current->mm->mmap_sem);
601 return ret;
602}
603
604extern unsigned long do_mremap(unsigned long addr,
605 unsigned long old_len, unsigned long new_len,
606 unsigned long flags, unsigned long new_addr);
607
608asmlinkage unsigned long sys64_mremap(unsigned long addr,
609 unsigned long old_len, unsigned long new_len,
610 unsigned long flags, unsigned long new_addr)
611{
612 struct vm_area_struct *vma;
613 unsigned long ret = -EINVAL;
8bcd1741 614
1da177e4
LT		 615 if (test_thread_flag(TIF_32BIT))
616 goto out;
8bcd1741 617 if (unlikely(new_len >= VA_EXCLUDE_START))
1da177e4 618 goto out;
8bcd1741 619 if (unlikely(invalid_64bit_range(addr, old_len)))
1da177e4 620 goto out;
8bcd1741 621
1da177e4
LT		 622 down_write(&current->mm->mmap_sem);
623 if (flags & MREMAP_FIXED) {
8bcd1741 624 if (invalid_64bit_range(new_addr, new_len))
1da177e4 625 goto out_sem;
8bcd1741 626 } else if (invalid_64bit_range(addr, new_len)) {
1da177e4
LT		 627 unsigned long map_flags = 0;
628 struct file *file = NULL;
629
630 ret = -ENOMEM;
631 if (!(flags & MREMAP_MAYMOVE))
632 goto out_sem;
633
634 vma = find_vma(current->mm, addr);
635 if (vma) {
636 if (vma->vm_flags & VM_SHARED)
637 map_flags |= MAP_SHARED;
638 file = vma->vm_file;
639 }
640
641 /* MREMAP_FIXED checked above. */
642 new_addr = get_unmapped_area(file, addr, new_len,
643 vma ? vma->vm_pgoff : 0,
644 map_flags);
645 ret = new_addr;
646 if (new_addr & ~PAGE_MASK)
647 goto out_sem;
648 flags |= MREMAP_FIXED;
649 }
650 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
651out_sem:
652 up_write(&current->mm->mmap_sem);
653out:
654 return ret;
655}
656
657/* we come to here via sys_nis_syscall so it can setup the regs argument */
658asmlinkage unsigned long c_sys_nis_syscall(struct pt_regs *regs)
659{
660 static int count;
661
662 /* Don't make the system unusable, if someone goes stuck */
663 if (count++ > 5)
664 return -ENOSYS;
665
666 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
667#ifdef DEBUG_UNIMP_SYSCALL
668 show_regs (regs);
669#endif
670
671 return -ENOSYS;
672}
673
674/* #define DEBUG_SPARC_BREAKPOINT */
675
676asmlinkage void sparc_breakpoint(struct pt_regs *regs)
677{
678 siginfo_t info;
679
680 if (test_thread_flag(TIF_32BIT)) {
681 regs->tpc &= 0xffffffff;
682 regs->tnpc &= 0xffffffff;
683 }
684#ifdef DEBUG_SPARC_BREAKPOINT
685 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
686#endif
687 info.si_signo = SIGTRAP;
688 info.si_errno = 0;
689 info.si_code = TRAP_BRKPT;
690 info.si_addr = (void __user *)regs->tpc;
691 info.si_trapno = 0;
692 force_sig_info(SIGTRAP, &info, current);
693#ifdef DEBUG_SPARC_BREAKPOINT
694 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
695#endif
696}
697
698extern void check_pending(int signum);
699
700asmlinkage long sys_getdomainname(char __user *name, int len)
701{
8310a32c
DM		 702 int nlen, err;
703
b9c54f91 704 if (len < 0)
8310a32c 705 return -EINVAL;
1da177e4
LT		 706
707 down_read(&uts_sem);
708
e9ff3990 709 nlen = strlen(utsname()->domainname) + 1;
b9c54f91
AW		 710 err = -EINVAL;
711 if (nlen > len)
712 goto out;
8310a32c
DM		 713
714 err = -EFAULT;
e9ff3990 715 if (!copy_to_user(name, utsname()->domainname, nlen))
8310a32c
DM		 716 err = 0;
717
b9c54f91 718out:
1da177e4
LT		 719 up_read(&uts_sem);
720 return err;
721}
722
1da177e4
LT		 723asmlinkage long sys_utrap_install(utrap_entry_t type,
724 utrap_handler_t new_p,
725 utrap_handler_t new_d,
726 utrap_handler_t __user *old_p,
727 utrap_handler_t __user *old_d)
728{
729 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
730 return -EINVAL;
731 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
732 if (old_p) {
733 if (!current_thread_info()->utraps) {
734 if (put_user(NULL, old_p))
735 return -EFAULT;
736 } else {
737 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
738 return -EFAULT;
739 }
740 }
741 if (old_d) {
742 if (put_user(NULL, old_d))
743 return -EFAULT;
744 }
745 return 0;
746 }
747 if (!current_thread_info()->utraps) {
748 current_thread_info()->utraps =
9132983a 749 kzalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
1da177e4
LT		 750 if (!current_thread_info()->utraps)
751 return -ENOMEM;
752 current_thread_info()->utraps[0] = 1;
1da177e4
LT		 753 } else {
754 if ((utrap_handler_t)current_thread_info()->utraps[type] != new_p &&
755 current_thread_info()->utraps[0] > 1) {
207ddd0a 756 unsigned long *p = current_thread_info()->utraps;
1da177e4
LT		 757
758 current_thread_info()->utraps =
759 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
760 GFP_KERNEL);
761 if (!current_thread_info()->utraps) {
762 current_thread_info()->utraps = p;
763 return -ENOMEM;
764 }
765 p[0]--;
766 current_thread_info()->utraps[0] = 1;
767 memcpy(current_thread_info()->utraps+1, p+1,
768 UT_TRAP_INSTRUCTION_31*sizeof(long));
769 }
770 }
771 if (old_p) {
772 if (put_user((utrap_handler_t)(current_thread_info()->utraps[type]), old_p))
773 return -EFAULT;
774 }
775 if (old_d) {
776 if (put_user(NULL, old_d))
777 return -EFAULT;
778 }
779 current_thread_info()->utraps[type] = (long)new_p;
780
781 return 0;
782}
783
207ddd0a
DM		 784asmlinkage long sparc_memory_ordering(unsigned long model,
785 struct pt_regs *regs)
1da177e4
LT		 786{
787 if (model >= 3)
788 return -EINVAL;
789 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
790 return 0;
791}
792
793asmlinkage long sys_rt_sigaction(int sig,
794 const struct sigaction __user *act,
795 struct sigaction __user *oact,
796 void __user *restorer,
797 size_t sigsetsize)
798{
799 struct k_sigaction new_ka, old_ka;
800 int ret;
801
802 /* XXX: Don't preclude handling different sized sigset_t's. */
803 if (sigsetsize != sizeof(sigset_t))
804 return -EINVAL;
805
806 if (act) {
807 new_ka.ka_restorer = restorer;
808 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
809 return -EFAULT;
810 }
811
812 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
813
814 if (!ret && oact) {
815 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
816 return -EFAULT;
817 }
818
819 return ret;
820}
821
822/* Invoked by rtrap code to update performance counters in
823 * user space.
824 */
825asmlinkage void update_perfctrs(void)
826{
827 unsigned long pic, tmp;
828
829 read_pic(pic);
830 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
831 __put_user(tmp, current_thread_info()->user_cntd0);
832 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
833 __put_user(tmp, current_thread_info()->user_cntd1);
834 reset_pic();
835}
836
837asmlinkage long sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
838{
839 int err = 0;
840
841 switch(opcode) {
842 case PERFCTR_ON:
843 current_thread_info()->pcr_reg = arg2;
844 current_thread_info()->user_cntd0 = (u64 __user *) arg0;
845 current_thread_info()->user_cntd1 = (u64 __user *) arg1;
846 current_thread_info()->kernel_cntd0 =
847 current_thread_info()->kernel_cntd1 = 0;
848 write_pcr(arg2);
849 reset_pic();
850 set_thread_flag(TIF_PERFCTR);
851 break;
852
853 case PERFCTR_OFF:
854 err = -EINVAL;
855 if (test_thread_flag(TIF_PERFCTR)) {
856 current_thread_info()->user_cntd0 =
857 current_thread_info()->user_cntd1 = NULL;
858 current_thread_info()->pcr_reg = 0;
859 write_pcr(0);
860 clear_thread_flag(TIF_PERFCTR);
861 err = 0;
862 }
863 break;
864
865 case PERFCTR_READ: {
866 unsigned long pic, tmp;
867
868 if (!test_thread_flag(TIF_PERFCTR)) {
869 err = -EINVAL;
870 break;
871 }
872 read_pic(pic);
873 tmp = (current_thread_info()->kernel_cntd0 += (unsigned int)pic);
874 err |= __put_user(tmp, current_thread_info()->user_cntd0);
875 tmp = (current_thread_info()->kernel_cntd1 += (pic >> 32));
876 err |= __put_user(tmp, current_thread_info()->user_cntd1);
877 reset_pic();
878 break;
879 }
880
881 case PERFCTR_CLRPIC:
882 if (!test_thread_flag(TIF_PERFCTR)) {
883 err = -EINVAL;
884 break;
885 }
886 current_thread_info()->kernel_cntd0 =
887 current_thread_info()->kernel_cntd1 = 0;
888 reset_pic();
889 break;
890
891 case PERFCTR_SETPCR: {
892 u64 __user *user_pcr = (u64 __user *)arg0;
893
894 if (!test_thread_flag(TIF_PERFCTR)) {
895 err = -EINVAL;
896 break;
897 }
898 err |= __get_user(current_thread_info()->pcr_reg, user_pcr);
899 write_pcr(current_thread_info()->pcr_reg);
900 current_thread_info()->kernel_cntd0 =
901 current_thread_info()->kernel_cntd1 = 0;
902 reset_pic();
903 break;
904 }
905
906 case PERFCTR_GETPCR: {
907 u64 __user *user_pcr = (u64 __user *)arg0;
908
909 if (!test_thread_flag(TIF_PERFCTR)) {
910 err = -EINVAL;
911 break;
912 }
913 err |= __put_user(current_thread_info()->pcr_reg, user_pcr);
914 break;
915 }
916
917 default:
918 err = -EINVAL;
919 break;
920 };
921 return err;
922}
fe74290d
AB		 923
924/*
925 * Do a system call from kernel instead of calling sys_execve so we
926 * end up with proper pt_regs.
927 */
928int kernel_execve(const char *filename, char *const argv[], char *const envp[])
929{
930 long __res;
931 register long __g1 __asm__ ("g1") = __NR_execve;
932 register long __o0 __asm__ ("o0") = (long)(filename);
933 register long __o1 __asm__ ("o1") = (long)(argv);
934 register long __o2 __asm__ ("o2") = (long)(envp);
935 asm volatile ("t 0x6d\n\t"
936 "sub %%g0, %%o0, %0\n\t"
937 "movcc %%xcc, %%o0, %0\n\t"
938 : "=r" (__res), "=&r" (__o0)
939 : "1" (__o0), "r" (__o1), "r" (__o2), "r" (__g1)
940 : "cc");
941 return __res;
942}
Linux kernel - Deliverables
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