xref: /linux/arch/m68k/kernel/sys_m68k.c (revision c537b994505099b7197e7d3125b942ecbcc51eb6) 
1 /*
2  * linux/arch/m68k/kernel/sys_m68k.c
3  *
4  * This file contains various random system calls that
5  * have a non-standard calling sequence on the Linux/m68k
6  * platform.
7  */
8 
9 #include <linux/capability.h>
10 #include <linux/errno.h>
11 #include <linux/sched.h>
12 #include <linux/mm.h>
13 #include <linux/smp.h>
14 #include <linux/smp_lock.h>
15 #include <linux/sem.h>
16 #include <linux/msg.h>
17 #include <linux/shm.h>
18 #include <linux/stat.h>
19 #include <linux/syscalls.h>
20 #include <linux/mman.h>
21 #include <linux/file.h>
22 #include <linux/utsname.h>
23 
24 #include <asm/setup.h>
25 #include <asm/uaccess.h>
26 #include <asm/cachectl.h>
27 #include <asm/traps.h>
28 #include <asm/ipc.h>
29 #include <asm/page.h>
30 #include <asm/unistd.h>
31 
32 /*
33  * sys_pipe() is the normal C calling standard for creating
34  * a pipe. It's not the way unix traditionally does this, though.
35  */
36 asmlinkage int sys_pipe(unsigned long __user * fildes)
37 {
38 	int fd[2];
39 	int error;
40 
41 	error = do_pipe(fd);
42 	if (!error) {
43 		if (copy_to_user(fildes, fd, 2*sizeof(int)))
44 			error = -EFAULT;
45 	}
46 	return error;
47 }
48 
49 /* common code for old and new mmaps */
50 static inline long do_mmap2(
51 	unsigned long addr, unsigned long len,
52 	unsigned long prot, unsigned long flags,
53 	unsigned long fd, unsigned long pgoff)
54 {
55 	int error = -EBADF;
56 	struct file * file = NULL;
57 
58 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
59 	if (!(flags & MAP_ANONYMOUS)) {
60 		file = fget(fd);
61 		if (!file)
62 			goto out;
63 	}
64 
65 	down_write(&current->mm->mmap_sem);
66 	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
67 	up_write(&current->mm->mmap_sem);
68 
69 	if (file)
70 		fput(file);
71 out:
72 	return error;
73 }
74 
75 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
76 	unsigned long prot, unsigned long flags,
77 	unsigned long fd, unsigned long pgoff)
78 {
79 	return do_mmap2(addr, len, prot, flags, fd, pgoff);
80 }
81 
82 /*
83  * Perform the select(nd, in, out, ex, tv) and mmap() system
84  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
85  * handle more than 4 system call parameters, so these system calls
86  * used a memory block for parameter passing..
87  */
88 
89 struct mmap_arg_struct {
90 	unsigned long addr;
91 	unsigned long len;
92 	unsigned long prot;
93 	unsigned long flags;
94 	unsigned long fd;
95 	unsigned long offset;
96 };
97 
98 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
99 {
100 	struct mmap_arg_struct a;
101 	int error = -EFAULT;
102 
103 	if (copy_from_user(&a, arg, sizeof(a)))
104 		goto out;
105 
106 	error = -EINVAL;
107 	if (a.offset & ~PAGE_MASK)
108 		goto out;
109 
110 	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
111 
112 	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
113 out:
114 	return error;
115 }
116 
117 #if 0
118 struct mmap_arg_struct64 {
119 	__u32 addr;
120 	__u32 len;
121 	__u32 prot;
122 	__u32 flags;
123 	__u64 offset; /* 64 bits */
124 	__u32 fd;
125 };
126 
127 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
128 {
129 	int error = -EFAULT;
130 	struct file * file = NULL;
131 	struct mmap_arg_struct64 a;
132 	unsigned long pgoff;
133 
134 	if (copy_from_user(&a, arg, sizeof(a)))
135 		return -EFAULT;
136 
137 	if ((long)a.offset & ~PAGE_MASK)
138 		return -EINVAL;
139 
140 	pgoff = a.offset >> PAGE_SHIFT;
141 	if ((a.offset >> PAGE_SHIFT) != pgoff)
142 		return -EINVAL;
143 
144 	if (!(a.flags & MAP_ANONYMOUS)) {
145 		error = -EBADF;
146 		file = fget(a.fd);
147 		if (!file)
148 			goto out;
149 	}
150 	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
151 
152 	down_write(&current->mm->mmap_sem);
153 	error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
154 	up_write(&current->mm->mmap_sem);
155 	if (file)
156 		fput(file);
157 out:
158 	return error;
159 }
160 #endif
161 
162 struct sel_arg_struct {
163 	unsigned long n;
164 	fd_set __user *inp, *outp, *exp;
165 	struct timeval __user *tvp;
166 };
167 
168 asmlinkage int old_select(struct sel_arg_struct __user *arg)
169 {
170 	struct sel_arg_struct a;
171 
172 	if (copy_from_user(&a, arg, sizeof(a)))
173 		return -EFAULT;
174 	/* sys_select() does the appropriate kernel locking */
175 	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
176 }
177 
178 /*
179  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
180  *
181  * This is really horribly ugly.
182  */
183 asmlinkage int sys_ipc (uint call, int first, int second,
184 			int third, void __user *ptr, long fifth)
185 {
186 	int version, ret;
187 
188 	version = call >> 16; /* hack for backward compatibility */
189 	call &= 0xffff;
190 
191 	if (call <= SEMCTL)
192 		switch (call) {
193 		case SEMOP:
194 			return sys_semop (first, ptr, second);
195 		case SEMGET:
196 			return sys_semget (first, second, third);
197 		case SEMCTL: {
198 			union semun fourth;
199 			if (!ptr)
200 				return -EINVAL;
201 			if (get_user(fourth.__pad, (void __user *__user *) ptr))
202 				return -EFAULT;
203 			return sys_semctl (first, second, third, fourth);
204 			}
205 		default:
206 			return -ENOSYS;
207 		}
208 	if (call <= MSGCTL)
209 		switch (call) {
210 		case MSGSND:
211 			return sys_msgsnd (first, ptr, second, third);
212 		case MSGRCV:
213 			switch (version) {
214 			case 0: {
215 				struct ipc_kludge tmp;
216 				if (!ptr)
217 					return -EINVAL;
218 				if (copy_from_user (&tmp, ptr, sizeof (tmp)))
219 					return -EFAULT;
220 				return sys_msgrcv (first, tmp.msgp, second,
221 						   tmp.msgtyp, third);
222 				}
223 			default:
224 				return sys_msgrcv (first, ptr,
225 						   second, fifth, third);
226 			}
227 		case MSGGET:
228 			return sys_msgget ((key_t) first, second);
229 		case MSGCTL:
230 			return sys_msgctl (first, second, ptr);
231 		default:
232 			return -ENOSYS;
233 		}
234 	if (call <= SHMCTL)
235 		switch (call) {
236 		case SHMAT:
237 			switch (version) {
238 			default: {
239 				ulong raddr;
240 				ret = do_shmat (first, ptr, second, &raddr);
241 				if (ret)
242 					return ret;
243 				return put_user (raddr, (ulong __user *) third);
244 			}
245 			}
246 		case SHMDT:
247 			return sys_shmdt (ptr);
248 		case SHMGET:
249 			return sys_shmget (first, second, third);
250 		case SHMCTL:
251 			return sys_shmctl (first, second, ptr);
252 		default:
253 			return -ENOSYS;
254 		}
255 
256 	return -EINVAL;
257 }
258 
259 /* Convert virtual (user) address VADDR to physical address PADDR */
260 #define virt_to_phys_040(vaddr)						\
261 ({									\
262   unsigned long _mmusr, _paddr;						\
263 									\
264   __asm__ __volatile__ (".chip 68040\n\t"				\
265 			"ptestr (%1)\n\t"				\
266 			"movec %%mmusr,%0\n\t"				\
267 			".chip 68k"					\
268 			: "=r" (_mmusr)					\
269 			: "a" (vaddr));					\
270   _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;		\
271   _paddr;								\
272 })
273 
274 static inline int
275 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
276 {
277   unsigned long paddr, i;
278 
279   switch (scope)
280     {
281     case FLUSH_SCOPE_ALL:
282       switch (cache)
283 	{
284 	case FLUSH_CACHE_DATA:
285 	  /* This nop is needed for some broken versions of the 68040.  */
286 	  __asm__ __volatile__ ("nop\n\t"
287 				".chip 68040\n\t"
288 				"cpusha %dc\n\t"
289 				".chip 68k");
290 	  break;
291 	case FLUSH_CACHE_INSN:
292 	  __asm__ __volatile__ ("nop\n\t"
293 				".chip 68040\n\t"
294 				"cpusha %ic\n\t"
295 				".chip 68k");
296 	  break;
297 	default:
298 	case FLUSH_CACHE_BOTH:
299 	  __asm__ __volatile__ ("nop\n\t"
300 				".chip 68040\n\t"
301 				"cpusha %bc\n\t"
302 				".chip 68k");
303 	  break;
304 	}
305       break;
306 
307     case FLUSH_SCOPE_LINE:
308       /* Find the physical address of the first mapped page in the
309 	 address range.  */
310       if ((paddr = virt_to_phys_040(addr))) {
311         paddr += addr & ~(PAGE_MASK | 15);
312         len = (len + (addr & 15) + 15) >> 4;
313       } else {
314 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
315 
316 	if (len <= tmp)
317 	  return 0;
318 	addr += tmp;
319 	len -= tmp;
320 	tmp = PAGE_SIZE;
321 	for (;;)
322 	  {
323 	    if ((paddr = virt_to_phys_040(addr)))
324 	      break;
325 	    if (len <= tmp)
326 	      return 0;
327 	    addr += tmp;
328 	    len -= tmp;
329 	  }
330 	len = (len + 15) >> 4;
331       }
332       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
333       while (len--)
334 	{
335 	  switch (cache)
336 	    {
337 	    case FLUSH_CACHE_DATA:
338 	      __asm__ __volatile__ ("nop\n\t"
339 				    ".chip 68040\n\t"
340 				    "cpushl %%dc,(%0)\n\t"
341 				    ".chip 68k"
342 				    : : "a" (paddr));
343 	      break;
344 	    case FLUSH_CACHE_INSN:
345 	      __asm__ __volatile__ ("nop\n\t"
346 				    ".chip 68040\n\t"
347 				    "cpushl %%ic,(%0)\n\t"
348 				    ".chip 68k"
349 				    : : "a" (paddr));
350 	      break;
351 	    default:
352 	    case FLUSH_CACHE_BOTH:
353 	      __asm__ __volatile__ ("nop\n\t"
354 				    ".chip 68040\n\t"
355 				    "cpushl %%bc,(%0)\n\t"
356 				    ".chip 68k"
357 				    : : "a" (paddr));
358 	      break;
359 	    }
360 	  if (!--i && len)
361 	    {
362 	      /*
363 	       * No need to page align here since it is done by
364 	       * virt_to_phys_040().
365 	       */
366 	      addr += PAGE_SIZE;
367 	      i = PAGE_SIZE / 16;
368 	      /* Recompute physical address when crossing a page
369 	         boundary. */
370 	      for (;;)
371 		{
372 		  if ((paddr = virt_to_phys_040(addr)))
373 		    break;
374 		  if (len <= i)
375 		    return 0;
376 		  len -= i;
377 		  addr += PAGE_SIZE;
378 		}
379 	    }
380 	  else
381 	    paddr += 16;
382 	}
383       break;
384 
385     default:
386     case FLUSH_SCOPE_PAGE:
387       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
388       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
389 	{
390 	  if (!(paddr = virt_to_phys_040(addr)))
391 	    continue;
392 	  switch (cache)
393 	    {
394 	    case FLUSH_CACHE_DATA:
395 	      __asm__ __volatile__ ("nop\n\t"
396 				    ".chip 68040\n\t"
397 				    "cpushp %%dc,(%0)\n\t"
398 				    ".chip 68k"
399 				    : : "a" (paddr));
400 	      break;
401 	    case FLUSH_CACHE_INSN:
402 	      __asm__ __volatile__ ("nop\n\t"
403 				    ".chip 68040\n\t"
404 				    "cpushp %%ic,(%0)\n\t"
405 				    ".chip 68k"
406 				    : : "a" (paddr));
407 	      break;
408 	    default:
409 	    case FLUSH_CACHE_BOTH:
410 	      __asm__ __volatile__ ("nop\n\t"
411 				    ".chip 68040\n\t"
412 				    "cpushp %%bc,(%0)\n\t"
413 				    ".chip 68k"
414 				    : : "a" (paddr));
415 	      break;
416 	    }
417 	}
418       break;
419     }
420   return 0;
421 }
422 
423 #define virt_to_phys_060(vaddr)				\
424 ({							\
425   unsigned long paddr;					\
426   __asm__ __volatile__ (".chip 68060\n\t"		\
427 			"plpar (%0)\n\t"		\
428 			".chip 68k"			\
429 			: "=a" (paddr)			\
430 			: "0" (vaddr));			\
431   (paddr); /* XXX */					\
432 })
433 
434 static inline int
435 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
436 {
437   unsigned long paddr, i;
438 
439   /*
440    * 68060 manual says:
441    *  cpush %dc : flush DC, remains valid (with our %cacr setup)
442    *  cpush %ic : invalidate IC
443    *  cpush %bc : flush DC + invalidate IC
444    */
445   switch (scope)
446     {
447     case FLUSH_SCOPE_ALL:
448       switch (cache)
449 	{
450 	case FLUSH_CACHE_DATA:
451 	  __asm__ __volatile__ (".chip 68060\n\t"
452 				"cpusha %dc\n\t"
453 				".chip 68k");
454 	  break;
455 	case FLUSH_CACHE_INSN:
456 	  __asm__ __volatile__ (".chip 68060\n\t"
457 				"cpusha %ic\n\t"
458 				".chip 68k");
459 	  break;
460 	default:
461 	case FLUSH_CACHE_BOTH:
462 	  __asm__ __volatile__ (".chip 68060\n\t"
463 				"cpusha %bc\n\t"
464 				".chip 68k");
465 	  break;
466 	}
467       break;
468 
469     case FLUSH_SCOPE_LINE:
470       /* Find the physical address of the first mapped page in the
471 	 address range.  */
472       len += addr & 15;
473       addr &= -16;
474       if (!(paddr = virt_to_phys_060(addr))) {
475 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
476 
477 	if (len <= tmp)
478 	  return 0;
479 	addr += tmp;
480 	len -= tmp;
481 	tmp = PAGE_SIZE;
482 	for (;;)
483 	  {
484 	    if ((paddr = virt_to_phys_060(addr)))
485 	      break;
486 	    if (len <= tmp)
487 	      return 0;
488 	    addr += tmp;
489 	    len -= tmp;
490 	  }
491       }
492       len = (len + 15) >> 4;
493       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
494       while (len--)
495 	{
496 	  switch (cache)
497 	    {
498 	    case FLUSH_CACHE_DATA:
499 	      __asm__ __volatile__ (".chip 68060\n\t"
500 				    "cpushl %%dc,(%0)\n\t"
501 				    ".chip 68k"
502 				    : : "a" (paddr));
503 	      break;
504 	    case FLUSH_CACHE_INSN:
505 	      __asm__ __volatile__ (".chip 68060\n\t"
506 				    "cpushl %%ic,(%0)\n\t"
507 				    ".chip 68k"
508 				    : : "a" (paddr));
509 	      break;
510 	    default:
511 	    case FLUSH_CACHE_BOTH:
512 	      __asm__ __volatile__ (".chip 68060\n\t"
513 				    "cpushl %%bc,(%0)\n\t"
514 				    ".chip 68k"
515 				    : : "a" (paddr));
516 	      break;
517 	    }
518 	  if (!--i && len)
519 	    {
520 
521 	      /*
522 	       * We just want to jump to the first cache line
523 	       * in the next page.
524 	       */
525 	      addr += PAGE_SIZE;
526 	      addr &= PAGE_MASK;
527 
528 	      i = PAGE_SIZE / 16;
529 	      /* Recompute physical address when crossing a page
530 	         boundary. */
531 	      for (;;)
532 	        {
533 	          if ((paddr = virt_to_phys_060(addr)))
534 	            break;
535 	          if (len <= i)
536 	            return 0;
537 	          len -= i;
538 	          addr += PAGE_SIZE;
539 	        }
540 	    }
541 	  else
542 	    paddr += 16;
543 	}
544       break;
545 
546     default:
547     case FLUSH_SCOPE_PAGE:
548       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
549       addr &= PAGE_MASK;	/* Workaround for bug in some
550 				   revisions of the 68060 */
551       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
552 	{
553 	  if (!(paddr = virt_to_phys_060(addr)))
554 	    continue;
555 	  switch (cache)
556 	    {
557 	    case FLUSH_CACHE_DATA:
558 	      __asm__ __volatile__ (".chip 68060\n\t"
559 				    "cpushp %%dc,(%0)\n\t"
560 				    ".chip 68k"
561 				    : : "a" (paddr));
562 	      break;
563 	    case FLUSH_CACHE_INSN:
564 	      __asm__ __volatile__ (".chip 68060\n\t"
565 				    "cpushp %%ic,(%0)\n\t"
566 				    ".chip 68k"
567 				    : : "a" (paddr));
568 	      break;
569 	    default:
570 	    case FLUSH_CACHE_BOTH:
571 	      __asm__ __volatile__ (".chip 68060\n\t"
572 				    "cpushp %%bc,(%0)\n\t"
573 				    ".chip 68k"
574 				    : : "a" (paddr));
575 	      break;
576 	    }
577 	}
578       break;
579     }
580   return 0;
581 }
582 
583 /* sys_cacheflush -- flush (part of) the processor cache.  */
584 asmlinkage int
585 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
586 {
587 	struct vm_area_struct *vma;
588 	int ret = -EINVAL;
589 
590 	lock_kernel();
591 	if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
592 	    cache & ~FLUSH_CACHE_BOTH)
593 		goto out;
594 
595 	if (scope == FLUSH_SCOPE_ALL) {
596 		/* Only the superuser may explicitly flush the whole cache. */
597 		ret = -EPERM;
598 		if (!capable(CAP_SYS_ADMIN))
599 			goto out;
600 	} else {
601 		/*
602 		 * Verify that the specified address region actually belongs
603 		 * to this process.
604 		 */
605 		vma = find_vma (current->mm, addr);
606 		ret = -EINVAL;
607 		/* Check for overflow.  */
608 		if (addr + len < addr)
609 			goto out;
610 		if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
611 			goto out;
612 	}
613 
614 	if (CPU_IS_020_OR_030) {
615 		if (scope == FLUSH_SCOPE_LINE && len < 256) {
616 			unsigned long cacr;
617 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
618 			if (cache & FLUSH_CACHE_INSN)
619 				cacr |= 4;
620 			if (cache & FLUSH_CACHE_DATA)
621 				cacr |= 0x400;
622 			len >>= 2;
623 			while (len--) {
624 				__asm__ __volatile__ ("movec %1, %%caar\n\t"
625 						      "movec %0, %%cacr"
626 						      : /* no outputs */
627 						      : "r" (cacr), "r" (addr));
628 				addr += 4;
629 			}
630 		} else {
631 			/* Flush the whole cache, even if page granularity requested. */
632 			unsigned long cacr;
633 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
634 			if (cache & FLUSH_CACHE_INSN)
635 				cacr |= 8;
636 			if (cache & FLUSH_CACHE_DATA)
637 				cacr |= 0x800;
638 			__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
639 		}
640 		ret = 0;
641 		goto out;
642 	} else {
643 	    /*
644 	     * 040 or 060: don't blindly trust 'scope', someone could
645 	     * try to flush a few megs of memory.
646 	     */
647 
648 	    if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
649 	        scope=FLUSH_SCOPE_PAGE;
650 	    if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
651 	        scope=FLUSH_SCOPE_ALL;
652 	    if (CPU_IS_040) {
653 		ret = cache_flush_040 (addr, scope, cache, len);
654 	    } else if (CPU_IS_060) {
655 		ret = cache_flush_060 (addr, scope, cache, len);
656 	    }
657 	}
658 out:
659 	unlock_kernel();
660 	return ret;
661 }
662 
663 asmlinkage int sys_getpagesize(void)
664 {
665 	return PAGE_SIZE;
666 }
667 
668 /*
669  * Do a system call from kernel instead of calling sys_execve so we
670  * end up with proper pt_regs.
671  */
672 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
673 {
674 	register long __res asm ("%d0") = __NR_execve;
675 	register long __a asm ("%d1") = (long)(filename);
676 	register long __b asm ("%d2") = (long)(argv);
677 	register long __c asm ("%d3") = (long)(envp);
678 	asm volatile ("trap  #0" : "+d" (__res)
679 			: "d" (__a), "d" (__b), "d" (__c));
680 	return __res;
681 }
682