File: /usr/src/linux/arch/sparc64/kernel/sys_sparc.c
1 /* $Id: sys_sparc.c,v 1.52 2001/04/14 01:12:02 davem Exp $
2 * linux/arch/sparc64/kernel/sys_sparc.c
3 *
4 * This file contains various random system calls that
5 * have a non-standard calling sequence on the Linux/sparc
6 * platform.
7 */
8
9 #include <linux/config.h>
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/sched.h>
13 #include <linux/fs.h>
14 #include <linux/file.h>
15 #include <linux/mm.h>
16 #include <linux/sem.h>
17 #include <linux/msg.h>
18 #include <linux/shm.h>
19 #include <linux/stat.h>
20 #include <linux/mman.h>
21 #include <linux/utsname.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/slab.h>
25 #include <linux/ipc.h>
26 #include <linux/personality.h>
27
28 #include <asm/uaccess.h>
29 #include <asm/ipc.h>
30 #include <asm/utrap.h>
31 #include <asm/perfctr.h>
32
33 /* #define DEBUG_UNIMP_SYSCALL */
34
35 /* XXX Make this per-binary type, this way we can detect the type of
36 * XXX a binary. Every Sparc executable calls this very early on.
37 */
38 asmlinkage unsigned long sys_getpagesize(void)
39 {
40 return PAGE_SIZE;
41 }
42
43 #define COLOUR_ALIGN(addr) (((addr)+SHMLBA-1)&~(SHMLBA-1))
44
45 unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
46 {
47 struct vm_area_struct * vmm;
48 unsigned long task_size = TASK_SIZE;
49
50 if (flags & MAP_FIXED) {
51 /* We do not accept a shared mapping if it would violate
52 * cache aliasing constraints.
53 */
54 if ((flags & MAP_SHARED) && (addr & (SHMLBA - 1)))
55 return -EINVAL;
56 return addr;
57 }
58
59 if (current->thread.flags & SPARC_FLAG_32BIT)
60 task_size = 0xf0000000UL;
61 if (len > task_size || len > -PAGE_OFFSET)
62 return -ENOMEM;
63 if (!addr)
64 addr = TASK_UNMAPPED_BASE;
65
66 if (flags & MAP_SHARED)
67 addr = COLOUR_ALIGN(addr);
68 else
69 addr = PAGE_ALIGN(addr);
70
71 task_size -= len;
72
73 for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) {
74 /* At this point: (!vmm || addr < vmm->vm_end). */
75 if (addr < PAGE_OFFSET && -PAGE_OFFSET - len < addr) {
76 addr = PAGE_OFFSET;
77 vmm = find_vma(current->mm, PAGE_OFFSET);
78 }
79 if (task_size < addr)
80 return -ENOMEM;
81 if (!vmm || addr + len <= vmm->vm_start)
82 return addr;
83 addr = vmm->vm_end;
84 if (flags & MAP_SHARED)
85 addr = COLOUR_ALIGN(addr);
86 }
87 }
88
89 /* Try to align mapping such that we align it as much as possible. */
90 unsigned long get_fb_unmapped_area(struct file *filp, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
91 {
92 unsigned long align_goal, addr = -ENOMEM;
93
94 if (flags & MAP_FIXED) {
95 /* Ok, don't mess with it. */
96 return get_unmapped_area(NULL, addr, len, pgoff, flags);
97 }
98 flags &= ~MAP_SHARED;
99
100 align_goal = PAGE_SIZE;
101 if (len >= (4UL * 1024 * 1024))
102 align_goal = (4UL * 1024 * 1024);
103 else if (len >= (512UL * 1024))
104 align_goal = (512UL * 1024);
105 else if (len >= (64UL * 1024))
106 align_goal = (64UL * 1024);
107
108 do {
109 addr = get_unmapped_area(NULL, orig_addr, len + (align_goal - PAGE_SIZE), pgoff, flags);
110 if (!(addr & ~PAGE_MASK)) {
111 addr = (addr + (align_goal - 1UL)) & ~(align_goal - 1UL);
112 break;
113 }
114
115 if (align_goal == (4UL * 1024 * 1024))
116 align_goal = (512UL * 1024);
117 else if (align_goal == (512UL * 1024))
118 align_goal = (64UL * 1024);
119 else
120 align_goal = PAGE_SIZE;
121 } while ((addr & ~PAGE_MASK) && align_goal > PAGE_SIZE);
122
123 /* Mapping is smaller than 64K or larger areas could not
124 * be obtained.
125 */
126 if (addr & ~PAGE_MASK)
127 addr = get_unmapped_area(NULL, orig_addr, len, pgoff, flags);
128
129 return addr;
130 }
131
132 extern asmlinkage unsigned long sys_brk(unsigned long brk);
133
134 asmlinkage unsigned long sparc_brk(unsigned long brk)
135 {
136 /* People could try to be nasty and use ta 0x6d in 32bit programs */
137 if ((current->thread.flags & SPARC_FLAG_32BIT) &&
138 brk >= 0xf0000000UL)
139 return current->mm->brk;
140
141 if ((current->mm->brk & PAGE_OFFSET) != (brk & PAGE_OFFSET))
142 return current->mm->brk;
143 return sys_brk(brk);
144 }
145
146 /*
147 * sys_pipe() is the normal C calling standard for creating
148 * a pipe. It's not the way unix traditionally does this, though.
149 */
150 asmlinkage int sparc_pipe(struct pt_regs *regs)
151 {
152 int fd[2];
153 int error;
154
155 error = do_pipe(fd);
156 if (error)
157 goto out;
158 regs->u_regs[UREG_I1] = fd[1];
159 error = fd[0];
160 out:
161 return error;
162 }
163
164 /*
165 * sys_ipc() is the de-multiplexer for the SysV IPC calls..
166 *
167 * This is really horribly ugly.
168 */
169
170 asmlinkage int sys_ipc (unsigned call, int first, int second, unsigned long third, void *ptr, long fifth)
171 {
172 int err;
173
174 /* No need for backward compatibility. We can start fresh... */
175
176 if (call <= SEMCTL)
177 switch (call) {
178 case SEMOP:
179 err = sys_semop (first, (struct sembuf *)ptr, second);
180 goto out;
181 case SEMGET:
182 err = sys_semget (first, second, (int)third);
183 goto out;
184 case SEMCTL: {
185 union semun fourth;
186 err = -EINVAL;
187 if (!ptr)
188 goto out;
189 err = -EFAULT;
190 if(get_user(fourth.__pad, (void **)ptr))
191 goto out;
192 err = sys_semctl (first, second | IPC_64, (int)third, fourth);
193 goto out;
194 }
195 default:
196 err = -EINVAL;
197 goto out;
198 }
199 if (call <= MSGCTL)
200 switch (call) {
201 case MSGSND:
202 err = sys_msgsnd (first, (struct msgbuf *) ptr,
203 second, (int)third);
204 goto out;
205 case MSGRCV:
206 err = sys_msgrcv (first, (struct msgbuf *) ptr, second, fifth, (int)third);
207 goto out;
208 case MSGGET:
209 err = sys_msgget ((key_t) first, second);
210 goto out;
211 case MSGCTL:
212 err = sys_msgctl (first, second | IPC_64, (struct msqid_ds *) ptr);
213 goto out;
214 default:
215 err = -EINVAL;
216 goto out;
217 }
218 if (call <= SHMCTL)
219 switch (call) {
220 case SHMAT:
221 err = sys_shmat (first, (char *) ptr, second, (ulong *) third);
222 goto out;
223 case SHMDT:
224 err = sys_shmdt ((char *)ptr);
225 goto out;
226 case SHMGET:
227 err = sys_shmget (first, second, (int)third);
228 goto out;
229 case SHMCTL:
230 err = sys_shmctl (first, second | IPC_64, (struct shmid_ds *) ptr);
231 goto out;
232 default:
233 err = -EINVAL;
234 goto out;
235 }
236 else
237 err = -EINVAL;
238 out:
239 return err;
240 }
241
242 extern asmlinkage int sys_newuname(struct new_utsname * name);
243
244 asmlinkage int sparc64_newuname(struct new_utsname * name)
245 {
246 int ret = sys_newuname(name);
247
248 if (current->personality == PER_LINUX32 && !ret) {
249 ret = copy_to_user(name->machine, "sparc\0\0", 8);
250 }
251 return ret;
252 }
253
254 extern asmlinkage long sys_personality(unsigned long);
255
256 asmlinkage int sparc64_personality(unsigned long personality)
257 {
258 int ret;
259 if (current->personality == PER_LINUX32 && personality == PER_LINUX)
260 personality = PER_LINUX32;
261 ret = sys_personality(personality);
262 if (ret == PER_LINUX32)
263 ret = PER_LINUX;
264 return ret;
265 }
266
267 /* Linux version of mmap */
268 asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
269 unsigned long prot, unsigned long flags, unsigned long fd,
270 unsigned long off)
271 {
272 struct file * file = NULL;
273 unsigned long retval = -EBADF;
274
275 if (!(flags & MAP_ANONYMOUS)) {
276 file = fget(fd);
277 if (!file)
278 goto out;
279 }
280 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
281 len = PAGE_ALIGN(len);
282 retval = -EINVAL;
283
284 if (current->thread.flags & SPARC_FLAG_32BIT) {
285 if (len > 0xf0000000UL ||
286 ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
287 goto out_putf;
288 } else {
289 if (len > -PAGE_OFFSET ||
290 ((flags & MAP_FIXED) &&
291 addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
292 goto out_putf;
293 }
294
295 down_write(¤t->mm->mmap_sem);
296 retval = do_mmap(file, addr, len, prot, flags, off);
297 up_write(¤t->mm->mmap_sem);
298
299 out_putf:
300 if (file)
301 fput(file);
302 out:
303 return retval;
304 }
305
306 asmlinkage long sys64_munmap(unsigned long addr, size_t len)
307 {
308 long ret;
309
310 if (len > -PAGE_OFFSET ||
311 (addr < PAGE_OFFSET && addr + len > -PAGE_OFFSET))
312 return -EINVAL;
313 down_write(¤t->mm->mmap_sem);
314 ret = do_munmap(current->mm, addr, len);
315 up_write(¤t->mm->mmap_sem);
316 return ret;
317 }
318
319 extern unsigned long do_mremap(unsigned long addr,
320 unsigned long old_len, unsigned long new_len,
321 unsigned long flags, unsigned long new_addr);
322
323 asmlinkage unsigned long sys64_mremap(unsigned long addr,
324 unsigned long old_len, unsigned long new_len,
325 unsigned long flags, unsigned long new_addr)
326 {
327 struct vm_area_struct *vma;
328 unsigned long ret = -EINVAL;
329 if (current->thread.flags & SPARC_FLAG_32BIT)
330 goto out;
331 if (old_len > -PAGE_OFFSET || new_len > -PAGE_OFFSET)
332 goto out;
333 if (addr < PAGE_OFFSET && addr + old_len > -PAGE_OFFSET)
334 goto out;
335 down_write(¤t->mm->mmap_sem);
336 if (flags & MREMAP_FIXED) {
337 if (new_addr < PAGE_OFFSET &&
338 new_addr + new_len > -PAGE_OFFSET)
339 goto out_sem;
340 } else if (addr < PAGE_OFFSET && addr + new_len > -PAGE_OFFSET) {
341 unsigned long map_flags = 0;
342 struct file *file = NULL;
343
344 ret = -ENOMEM;
345 if (!(flags & MREMAP_MAYMOVE))
346 goto out_sem;
347
348 vma = find_vma(current->mm, addr);
349 if (vma) {
350 if (vma->vm_flags & VM_SHARED)
351 map_flags |= MAP_SHARED;
352 file = vma->vm_file;
353 }
354
355 /* MREMAP_FIXED checked above. */
356 new_addr = get_unmapped_area(file, addr, new_len,
357 vma ? vma->vm_pgoff : 0,
358 map_flags);
359 ret = new_addr;
360 if (new_addr & ~PAGE_MASK)
361 goto out_sem;
362 flags |= MREMAP_FIXED;
363 }
364 ret = do_mremap(addr, old_len, new_len, flags, new_addr);
365 out_sem:
366 up_write(¤t->mm->mmap_sem);
367 out:
368 return ret;
369 }
370
371 /* we come to here via sys_nis_syscall so it can setup the regs argument */
372 asmlinkage unsigned long
373 c_sys_nis_syscall (struct pt_regs *regs)
374 {
375 static int count=0;
376
377 /* Don't make the system unusable, if someone goes stuck */
378 if (count++ > 5)
379 return -ENOSYS;
380
381 printk ("Unimplemented SPARC system call %ld\n",regs->u_regs[1]);
382 #ifdef DEBUG_UNIMP_SYSCALL
383 show_regs (regs);
384 #endif
385
386 return -ENOSYS;
387 }
388
389 /* #define DEBUG_SPARC_BREAKPOINT */
390
391 asmlinkage void
392 sparc_breakpoint (struct pt_regs *regs)
393 {
394 siginfo_t info;
395
396 if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
397 regs->tpc &= 0xffffffff;
398 regs->tnpc &= 0xffffffff;
399 }
400 #ifdef DEBUG_SPARC_BREAKPOINT
401 printk ("TRAP: Entering kernel PC=%lx, nPC=%lx\n", regs->tpc, regs->tnpc);
402 #endif
403 info.si_signo = SIGTRAP;
404 info.si_errno = 0;
405 info.si_code = TRAP_BRKPT;
406 info.si_addr = (void *)regs->tpc;
407 info.si_trapno = 0;
408 force_sig_info(SIGTRAP, &info, current);
409 #ifdef DEBUG_SPARC_BREAKPOINT
410 printk ("TRAP: Returning to space: PC=%lx nPC=%lx\n", regs->tpc, regs->tnpc);
411 #endif
412 }
413
414 extern void check_pending(int signum);
415
416 asmlinkage int sys_getdomainname(char *name, int len)
417 {
418 int nlen;
419 int err = -EFAULT;
420
421 down_read(&uts_sem);
422
423 nlen = strlen(system_utsname.domainname) + 1;
424
425 if (nlen < len)
426 len = nlen;
427 if(len > __NEW_UTS_LEN)
428 goto done;
429 if(copy_to_user(name, system_utsname.domainname, len))
430 goto done;
431 err = 0;
432 done:
433 up_read(&uts_sem);
434 return err;
435 }
436
437 /* only AP+ systems have sys_aplib */
438 asmlinkage int sys_aplib(void)
439 {
440 return -ENOSYS;
441 }
442
443 asmlinkage int solaris_syscall(struct pt_regs *regs)
444 {
445 static int count = 0;
446
447 regs->tpc = regs->tnpc;
448 regs->tnpc += 4;
449 if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
450 regs->tpc &= 0xffffffff;
451 regs->tnpc &= 0xffffffff;
452 }
453 if(++count <= 5) {
454 printk ("For Solaris binary emulation you need solaris module loaded\n");
455 show_regs (regs);
456 }
457 send_sig(SIGSEGV, current, 1);
458
459 return -ENOSYS;
460 }
461
462 #ifndef CONFIG_SUNOS_EMUL
463 asmlinkage int sunos_syscall(struct pt_regs *regs)
464 {
465 static int count = 0;
466
467 regs->tpc = regs->tnpc;
468 regs->tnpc += 4;
469 if ((current->thread.flags & SPARC_FLAG_32BIT) != 0) {
470 regs->tpc &= 0xffffffff;
471 regs->tnpc &= 0xffffffff;
472 }
473 if(++count <= 20)
474 printk ("SunOS binary emulation not compiled in\n");
475 force_sig(SIGSEGV, current);
476
477 return -ENOSYS;
478 }
479 #endif
480
481 asmlinkage int sys_utrap_install(utrap_entry_t type, utrap_handler_t new_p,
482 utrap_handler_t new_d,
483 utrap_handler_t *old_p, utrap_handler_t *old_d)
484 {
485 if (type < UT_INSTRUCTION_EXCEPTION || type > UT_TRAP_INSTRUCTION_31)
486 return -EINVAL;
487 if (new_p == (utrap_handler_t)(long)UTH_NOCHANGE) {
488 if (old_p) {
489 if (!current->thread.utraps) {
490 if (put_user(NULL, old_p))
491 return -EFAULT;
492 } else {
493 if (put_user((utrap_handler_t)(current->thread.utraps[type]), old_p))
494 return -EFAULT;
495 }
496 }
497 if (old_d) {
498 if (put_user(NULL, old_d))
499 return -EFAULT;
500 }
501 return 0;
502 }
503 if (!current->thread.utraps) {
504 current->thread.utraps =
505 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long), GFP_KERNEL);
506 if (!current->thread.utraps) return -ENOMEM;
507 current->thread.utraps[0] = 1;
508 memset(current->thread.utraps+1, 0, UT_TRAP_INSTRUCTION_31*sizeof(long));
509 } else {
510 if ((utrap_handler_t)current->thread.utraps[type] != new_p &&
511 current->thread.utraps[0] > 1) {
512 long *p = current->thread.utraps;
513
514 current->thread.utraps =
515 kmalloc((UT_TRAP_INSTRUCTION_31+1)*sizeof(long),
516 GFP_KERNEL);
517 if (!current->thread.utraps) {
518 current->thread.utraps = p;
519 return -ENOMEM;
520 }
521 p[0]--;
522 current->thread.utraps[0] = 1;
523 memcpy(current->thread.utraps+1, p+1,
524 UT_TRAP_INSTRUCTION_31*sizeof(long));
525 }
526 }
527 if (old_p) {
528 if (put_user((utrap_handler_t)(current->thread.utraps[type]), old_p))
529 return -EFAULT;
530 }
531 if (old_d) {
532 if (put_user(NULL, old_d))
533 return -EFAULT;
534 }
535 current->thread.utraps[type] = (long)new_p;
536
537 return 0;
538 }
539
540 long sparc_memory_ordering(unsigned long model, struct pt_regs *regs)
541 {
542 if (model >= 3)
543 return -EINVAL;
544 regs->tstate = (regs->tstate & ~TSTATE_MM) | (model << 14);
545 return 0;
546 }
547
548 asmlinkage int
549 sys_rt_sigaction(int sig, const struct sigaction *act, struct sigaction *oact,
550 void *restorer, size_t sigsetsize)
551 {
552 struct k_sigaction new_ka, old_ka;
553 int ret;
554
555 /* XXX: Don't preclude handling different sized sigset_t's. */
556 if (sigsetsize != sizeof(sigset_t))
557 return -EINVAL;
558
559 if (act) {
560 new_ka.ka_restorer = restorer;
561 if (copy_from_user(&new_ka.sa, act, sizeof(*act)))
562 return -EFAULT;
563 }
564
565 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
566
567 if (!ret && oact) {
568 if (copy_to_user(oact, &old_ka.sa, sizeof(*oact)))
569 return -EFAULT;
570 }
571
572 return ret;
573 }
574
575 /* Invoked by rtrap code to update performance counters in
576 * user space.
577 */
578 asmlinkage void
579 update_perfctrs(void)
580 {
581 unsigned long pic, tmp;
582
583 read_pic(pic);
584 tmp = (current->thread.kernel_cntd0 += (unsigned int)pic);
585 __put_user(tmp, current->thread.user_cntd0);
586 tmp = (current->thread.kernel_cntd1 += (pic >> 32));
587 __put_user(tmp, current->thread.user_cntd1);
588 reset_pic();
589 }
590
591 asmlinkage int
592 sys_perfctr(int opcode, unsigned long arg0, unsigned long arg1, unsigned long arg2)
593 {
594 int err = 0;
595
596 switch(opcode) {
597 case PERFCTR_ON:
598 current->thread.pcr_reg = arg2;
599 current->thread.user_cntd0 = (u64 *) arg0;
600 current->thread.user_cntd1 = (u64 *) arg1;
601 current->thread.kernel_cntd0 =
602 current->thread.kernel_cntd1 = 0;
603 write_pcr(arg2);
604 reset_pic();
605 current->thread.flags |= SPARC_FLAG_PERFCTR;
606 break;
607
608 case PERFCTR_OFF:
609 err = -EINVAL;
610 if ((current->thread.flags & SPARC_FLAG_PERFCTR) != 0) {
611 current->thread.user_cntd0 =
612 current->thread.user_cntd1 = NULL;
613 current->thread.pcr_reg = 0;
614 write_pcr(0);
615 current->thread.flags &= ~(SPARC_FLAG_PERFCTR);
616 err = 0;
617 }
618 break;
619
620 case PERFCTR_READ: {
621 unsigned long pic, tmp;
622
623 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
624 err = -EINVAL;
625 break;
626 }
627 read_pic(pic);
628 tmp = (current->thread.kernel_cntd0 += (unsigned int)pic);
629 err |= __put_user(tmp, current->thread.user_cntd0);
630 tmp = (current->thread.kernel_cntd1 += (pic >> 32));
631 err |= __put_user(tmp, current->thread.user_cntd1);
632 reset_pic();
633 break;
634 }
635
636 case PERFCTR_CLRPIC:
637 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
638 err = -EINVAL;
639 break;
640 }
641 current->thread.kernel_cntd0 =
642 current->thread.kernel_cntd1 = 0;
643 reset_pic();
644 break;
645
646 case PERFCTR_SETPCR: {
647 u64 *user_pcr = (u64 *)arg0;
648 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
649 err = -EINVAL;
650 break;
651 }
652 err |= __get_user(current->thread.pcr_reg, user_pcr);
653 write_pcr(current->thread.pcr_reg);
654 current->thread.kernel_cntd0 =
655 current->thread.kernel_cntd1 = 0;
656 reset_pic();
657 break;
658 }
659
660 case PERFCTR_GETPCR: {
661 u64 *user_pcr = (u64 *)arg0;
662 if (!(current->thread.flags & SPARC_FLAG_PERFCTR)) {
663 err = -EINVAL;
664 break;
665 }
666 err |= __put_user(current->thread.pcr_reg, user_pcr);
667 break;
668 }
669
670 default:
671 err = -EINVAL;
672 break;
673 };
674 return err;
675 }
676