xref: /openbmc/linux/arch/m68k/kernel/sys_m68k.c (revision c21b37f6) 
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/fs.h>
14 #include <linux/smp.h>
15 #include <linux/smp_lock.h>
16 #include <linux/sem.h>
17 #include <linux/msg.h>
18 #include <linux/shm.h>
19 #include <linux/stat.h>
20 #include <linux/syscalls.h>
21 #include <linux/mman.h>
22 #include <linux/file.h>
23 #include <linux/utsname.h>
24 
25 #include <asm/setup.h>
26 #include <asm/uaccess.h>
27 #include <asm/cachectl.h>
28 #include <asm/traps.h>
29 #include <asm/ipc.h>
30 #include <asm/page.h>
31 #include <asm/unistd.h>
32 
33 /*
34  * sys_pipe() is the normal C calling standard for creating
35  * a pipe. It's not the way unix traditionally does this, though.
36  */
37 asmlinkage int sys_pipe(unsigned long __user * fildes)
38 {
39 	int fd[2];
40 	int error;
41 
42 	error = do_pipe(fd);
43 	if (!error) {
44 		if (copy_to_user(fildes, fd, 2*sizeof(int)))
45 			error = -EFAULT;
46 	}
47 	return error;
48 }
49 
50 /* common code for old and new mmaps */
51 static inline long do_mmap2(
52 	unsigned long addr, unsigned long len,
53 	unsigned long prot, unsigned long flags,
54 	unsigned long fd, unsigned long pgoff)
55 {
56 	int error = -EBADF;
57 	struct file * file = NULL;
58 
59 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
60 	if (!(flags & MAP_ANONYMOUS)) {
61 		file = fget(fd);
62 		if (!file)
63 			goto out;
64 	}
65 
66 	down_write(&current->mm->mmap_sem);
67 	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
68 	up_write(&current->mm->mmap_sem);
69 
70 	if (file)
71 		fput(file);
72 out:
73 	return error;
74 }
75 
76 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
77 	unsigned long prot, unsigned long flags,
78 	unsigned long fd, unsigned long pgoff)
79 {
80 	return do_mmap2(addr, len, prot, flags, fd, pgoff);
81 }
82 
83 /*
84  * Perform the select(nd, in, out, ex, tv) and mmap() system
85  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
86  * handle more than 4 system call parameters, so these system calls
87  * used a memory block for parameter passing..
88  */
89 
90 struct mmap_arg_struct {
91 	unsigned long addr;
92 	unsigned long len;
93 	unsigned long prot;
94 	unsigned long flags;
95 	unsigned long fd;
96 	unsigned long offset;
97 };
98 
99 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
100 {
101 	struct mmap_arg_struct a;
102 	int error = -EFAULT;
103 
104 	if (copy_from_user(&a, arg, sizeof(a)))
105 		goto out;
106 
107 	error = -EINVAL;
108 	if (a.offset & ~PAGE_MASK)
109 		goto out;
110 
111 	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
112 
113 	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
114 out:
115 	return error;
116 }
117 
118 #if 0
119 struct mmap_arg_struct64 {
120 	__u32 addr;
121 	__u32 len;
122 	__u32 prot;
123 	__u32 flags;
124 	__u64 offset; /* 64 bits */
125 	__u32 fd;
126 };
127 
128 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
129 {
130 	int error = -EFAULT;
131 	struct file * file = NULL;
132 	struct mmap_arg_struct64 a;
133 	unsigned long pgoff;
134 
135 	if (copy_from_user(&a, arg, sizeof(a)))
136 		return -EFAULT;
137 
138 	if ((long)a.offset & ~PAGE_MASK)
139 		return -EINVAL;
140 
141 	pgoff = a.offset >> PAGE_SHIFT;
142 	if ((a.offset >> PAGE_SHIFT) != pgoff)
143 		return -EINVAL;
144 
145 	if (!(a.flags & MAP_ANONYMOUS)) {
146 		error = -EBADF;
147 		file = fget(a.fd);
148 		if (!file)
149 			goto out;
150 	}
151 	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
152 
153 	down_write(&current->mm->mmap_sem);
154 	error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
155 	up_write(&current->mm->mmap_sem);
156 	if (file)
157 		fput(file);
158 out:
159 	return error;
160 }
161 #endif
162 
163 struct sel_arg_struct {
164 	unsigned long n;
165 	fd_set __user *inp, *outp, *exp;
166 	struct timeval __user *tvp;
167 };
168 
169 asmlinkage int old_select(struct sel_arg_struct __user *arg)
170 {
171 	struct sel_arg_struct a;
172 
173 	if (copy_from_user(&a, arg, sizeof(a)))
174 		return -EFAULT;
175 	/* sys_select() does the appropriate kernel locking */
176 	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
177 }
178 
179 /*
180  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
181  *
182  * This is really horribly ugly.
183  */
184 asmlinkage int sys_ipc (uint call, int first, int second,
185 			int third, void __user *ptr, long fifth)
186 {
187 	int version, ret;
188 
189 	version = call >> 16; /* hack for backward compatibility */
190 	call &= 0xffff;
191 
192 	if (call <= SEMCTL)
193 		switch (call) {
194 		case SEMOP:
195 			return sys_semop (first, ptr, second);
196 		case SEMGET:
197 			return sys_semget (first, second, third);
198 		case SEMCTL: {
199 			union semun fourth;
200 			if (!ptr)
201 				return -EINVAL;
202 			if (get_user(fourth.__pad, (void __user *__user *) ptr))
203 				return -EFAULT;
204 			return sys_semctl (first, second, third, fourth);
205 			}
206 		default:
207 			return -ENOSYS;
208 		}
209 	if (call <= MSGCTL)
210 		switch (call) {
211 		case MSGSND:
212 			return sys_msgsnd (first, ptr, second, third);
213 		case MSGRCV:
214 			switch (version) {
215 			case 0: {
216 				struct ipc_kludge tmp;
217 				if (!ptr)
218 					return -EINVAL;
219 				if (copy_from_user (&tmp, ptr, sizeof (tmp)))
220 					return -EFAULT;
221 				return sys_msgrcv (first, tmp.msgp, second,
222 						   tmp.msgtyp, third);
223 				}
224 			default:
225 				return sys_msgrcv (first, ptr,
226 						   second, fifth, third);
227 			}
228 		case MSGGET:
229 			return sys_msgget ((key_t) first, second);
230 		case MSGCTL:
231 			return sys_msgctl (first, second, ptr);
232 		default:
233 			return -ENOSYS;
234 		}
235 	if (call <= SHMCTL)
236 		switch (call) {
237 		case SHMAT:
238 			switch (version) {
239 			default: {
240 				ulong raddr;
241 				ret = do_shmat (first, ptr, second, &raddr);
242 				if (ret)
243 					return ret;
244 				return put_user (raddr, (ulong __user *) third);
245 			}
246 			}
247 		case SHMDT:
248 			return sys_shmdt (ptr);
249 		case SHMGET:
250 			return sys_shmget (first, second, third);
251 		case SHMCTL:
252 			return sys_shmctl (first, second, ptr);
253 		default:
254 			return -ENOSYS;
255 		}
256 
257 	return -EINVAL;
258 }
259 
260 /* Convert virtual (user) address VADDR to physical address PADDR */
261 #define virt_to_phys_040(vaddr)						\
262 ({									\
263   unsigned long _mmusr, _paddr;						\
264 									\
265   __asm__ __volatile__ (".chip 68040\n\t"				\
266 			"ptestr (%1)\n\t"				\
267 			"movec %%mmusr,%0\n\t"				\
268 			".chip 68k"					\
269 			: "=r" (_mmusr)					\
270 			: "a" (vaddr));					\
271   _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;		\
272   _paddr;								\
273 })
274 
275 static inline int
276 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
277 {
278   unsigned long paddr, i;
279 
280   switch (scope)
281     {
282     case FLUSH_SCOPE_ALL:
283       switch (cache)
284 	{
285 	case FLUSH_CACHE_DATA:
286 	  /* This nop is needed for some broken versions of the 68040.  */
287 	  __asm__ __volatile__ ("nop\n\t"
288 				".chip 68040\n\t"
289 				"cpusha %dc\n\t"
290 				".chip 68k");
291 	  break;
292 	case FLUSH_CACHE_INSN:
293 	  __asm__ __volatile__ ("nop\n\t"
294 				".chip 68040\n\t"
295 				"cpusha %ic\n\t"
296 				".chip 68k");
297 	  break;
298 	default:
299 	case FLUSH_CACHE_BOTH:
300 	  __asm__ __volatile__ ("nop\n\t"
301 				".chip 68040\n\t"
302 				"cpusha %bc\n\t"
303 				".chip 68k");
304 	  break;
305 	}
306       break;
307 
308     case FLUSH_SCOPE_LINE:
309       /* Find the physical address of the first mapped page in the
310 	 address range.  */
311       if ((paddr = virt_to_phys_040(addr))) {
312         paddr += addr & ~(PAGE_MASK | 15);
313         len = (len + (addr & 15) + 15) >> 4;
314       } else {
315 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
316 
317 	if (len <= tmp)
318 	  return 0;
319 	addr += tmp;
320 	len -= tmp;
321 	tmp = PAGE_SIZE;
322 	for (;;)
323 	  {
324 	    if ((paddr = virt_to_phys_040(addr)))
325 	      break;
326 	    if (len <= tmp)
327 	      return 0;
328 	    addr += tmp;
329 	    len -= tmp;
330 	  }
331 	len = (len + 15) >> 4;
332       }
333       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
334       while (len--)
335 	{
336 	  switch (cache)
337 	    {
338 	    case FLUSH_CACHE_DATA:
339 	      __asm__ __volatile__ ("nop\n\t"
340 				    ".chip 68040\n\t"
341 				    "cpushl %%dc,(%0)\n\t"
342 				    ".chip 68k"
343 				    : : "a" (paddr));
344 	      break;
345 	    case FLUSH_CACHE_INSN:
346 	      __asm__ __volatile__ ("nop\n\t"
347 				    ".chip 68040\n\t"
348 				    "cpushl %%ic,(%0)\n\t"
349 				    ".chip 68k"
350 				    : : "a" (paddr));
351 	      break;
352 	    default:
353 	    case FLUSH_CACHE_BOTH:
354 	      __asm__ __volatile__ ("nop\n\t"
355 				    ".chip 68040\n\t"
356 				    "cpushl %%bc,(%0)\n\t"
357 				    ".chip 68k"
358 				    : : "a" (paddr));
359 	      break;
360 	    }
361 	  if (!--i && len)
362 	    {
363 	      /*
364 	       * No need to page align here since it is done by
365 	       * virt_to_phys_040().
366 	       */
367 	      addr += PAGE_SIZE;
368 	      i = PAGE_SIZE / 16;
369 	      /* Recompute physical address when crossing a page
370 	         boundary. */
371 	      for (;;)
372 		{
373 		  if ((paddr = virt_to_phys_040(addr)))
374 		    break;
375 		  if (len <= i)
376 		    return 0;
377 		  len -= i;
378 		  addr += PAGE_SIZE;
379 		}
380 	    }
381 	  else
382 	    paddr += 16;
383 	}
384       break;
385 
386     default:
387     case FLUSH_SCOPE_PAGE:
388       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
389       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
390 	{
391 	  if (!(paddr = virt_to_phys_040(addr)))
392 	    continue;
393 	  switch (cache)
394 	    {
395 	    case FLUSH_CACHE_DATA:
396 	      __asm__ __volatile__ ("nop\n\t"
397 				    ".chip 68040\n\t"
398 				    "cpushp %%dc,(%0)\n\t"
399 				    ".chip 68k"
400 				    : : "a" (paddr));
401 	      break;
402 	    case FLUSH_CACHE_INSN:
403 	      __asm__ __volatile__ ("nop\n\t"
404 				    ".chip 68040\n\t"
405 				    "cpushp %%ic,(%0)\n\t"
406 				    ".chip 68k"
407 				    : : "a" (paddr));
408 	      break;
409 	    default:
410 	    case FLUSH_CACHE_BOTH:
411 	      __asm__ __volatile__ ("nop\n\t"
412 				    ".chip 68040\n\t"
413 				    "cpushp %%bc,(%0)\n\t"
414 				    ".chip 68k"
415 				    : : "a" (paddr));
416 	      break;
417 	    }
418 	}
419       break;
420     }
421   return 0;
422 }
423 
424 #define virt_to_phys_060(vaddr)				\
425 ({							\
426   unsigned long paddr;					\
427   __asm__ __volatile__ (".chip 68060\n\t"		\
428 			"plpar (%0)\n\t"		\
429 			".chip 68k"			\
430 			: "=a" (paddr)			\
431 			: "0" (vaddr));			\
432   (paddr); /* XXX */					\
433 })
434 
435 static inline int
436 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
437 {
438   unsigned long paddr, i;
439 
440   /*
441    * 68060 manual says:
442    *  cpush %dc : flush DC, remains valid (with our %cacr setup)
443    *  cpush %ic : invalidate IC
444    *  cpush %bc : flush DC + invalidate IC
445    */
446   switch (scope)
447     {
448     case FLUSH_SCOPE_ALL:
449       switch (cache)
450 	{
451 	case FLUSH_CACHE_DATA:
452 	  __asm__ __volatile__ (".chip 68060\n\t"
453 				"cpusha %dc\n\t"
454 				".chip 68k");
455 	  break;
456 	case FLUSH_CACHE_INSN:
457 	  __asm__ __volatile__ (".chip 68060\n\t"
458 				"cpusha %ic\n\t"
459 				".chip 68k");
460 	  break;
461 	default:
462 	case FLUSH_CACHE_BOTH:
463 	  __asm__ __volatile__ (".chip 68060\n\t"
464 				"cpusha %bc\n\t"
465 				".chip 68k");
466 	  break;
467 	}
468       break;
469 
470     case FLUSH_SCOPE_LINE:
471       /* Find the physical address of the first mapped page in the
472 	 address range.  */
473       len += addr & 15;
474       addr &= -16;
475       if (!(paddr = virt_to_phys_060(addr))) {
476 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
477 
478 	if (len <= tmp)
479 	  return 0;
480 	addr += tmp;
481 	len -= tmp;
482 	tmp = PAGE_SIZE;
483 	for (;;)
484 	  {
485 	    if ((paddr = virt_to_phys_060(addr)))
486 	      break;
487 	    if (len <= tmp)
488 	      return 0;
489 	    addr += tmp;
490 	    len -= tmp;
491 	  }
492       }
493       len = (len + 15) >> 4;
494       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
495       while (len--)
496 	{
497 	  switch (cache)
498 	    {
499 	    case FLUSH_CACHE_DATA:
500 	      __asm__ __volatile__ (".chip 68060\n\t"
501 				    "cpushl %%dc,(%0)\n\t"
502 				    ".chip 68k"
503 				    : : "a" (paddr));
504 	      break;
505 	    case FLUSH_CACHE_INSN:
506 	      __asm__ __volatile__ (".chip 68060\n\t"
507 				    "cpushl %%ic,(%0)\n\t"
508 				    ".chip 68k"
509 				    : : "a" (paddr));
510 	      break;
511 	    default:
512 	    case FLUSH_CACHE_BOTH:
513 	      __asm__ __volatile__ (".chip 68060\n\t"
514 				    "cpushl %%bc,(%0)\n\t"
515 				    ".chip 68k"
516 				    : : "a" (paddr));
517 	      break;
518 	    }
519 	  if (!--i && len)
520 	    {
521 
522 	      /*
523 	       * We just want to jump to the first cache line
524 	       * in the next page.
525 	       */
526 	      addr += PAGE_SIZE;
527 	      addr &= PAGE_MASK;
528 
529 	      i = PAGE_SIZE / 16;
530 	      /* Recompute physical address when crossing a page
531 	         boundary. */
532 	      for (;;)
533 	        {
534 	          if ((paddr = virt_to_phys_060(addr)))
535 	            break;
536 	          if (len <= i)
537 	            return 0;
538 	          len -= i;
539 	          addr += PAGE_SIZE;
540 	        }
541 	    }
542 	  else
543 	    paddr += 16;
544 	}
545       break;
546 
547     default:
548     case FLUSH_SCOPE_PAGE:
549       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
550       addr &= PAGE_MASK;	/* Workaround for bug in some
551 				   revisions of the 68060 */
552       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
553 	{
554 	  if (!(paddr = virt_to_phys_060(addr)))
555 	    continue;
556 	  switch (cache)
557 	    {
558 	    case FLUSH_CACHE_DATA:
559 	      __asm__ __volatile__ (".chip 68060\n\t"
560 				    "cpushp %%dc,(%0)\n\t"
561 				    ".chip 68k"
562 				    : : "a" (paddr));
563 	      break;
564 	    case FLUSH_CACHE_INSN:
565 	      __asm__ __volatile__ (".chip 68060\n\t"
566 				    "cpushp %%ic,(%0)\n\t"
567 				    ".chip 68k"
568 				    : : "a" (paddr));
569 	      break;
570 	    default:
571 	    case FLUSH_CACHE_BOTH:
572 	      __asm__ __volatile__ (".chip 68060\n\t"
573 				    "cpushp %%bc,(%0)\n\t"
574 				    ".chip 68k"
575 				    : : "a" (paddr));
576 	      break;
577 	    }
578 	}
579       break;
580     }
581   return 0;
582 }
583 
584 /* sys_cacheflush -- flush (part of) the processor cache.  */
585 asmlinkage int
586 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
587 {
588 	struct vm_area_struct *vma;
589 	int ret = -EINVAL;
590 
591 	lock_kernel();
592 	if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
593 	    cache & ~FLUSH_CACHE_BOTH)
594 		goto out;
595 
596 	if (scope == FLUSH_SCOPE_ALL) {
597 		/* Only the superuser may explicitly flush the whole cache. */
598 		ret = -EPERM;
599 		if (!capable(CAP_SYS_ADMIN))
600 			goto out;
601 	} else {
602 		/*
603 		 * Verify that the specified address region actually belongs
604 		 * to this process.
605 		 */
606 		vma = find_vma (current->mm, addr);
607 		ret = -EINVAL;
608 		/* Check for overflow.  */
609 		if (addr + len < addr)
610 			goto out;
611 		if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
612 			goto out;
613 	}
614 
615 	if (CPU_IS_020_OR_030) {
616 		if (scope == FLUSH_SCOPE_LINE && len < 256) {
617 			unsigned long cacr;
618 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
619 			if (cache & FLUSH_CACHE_INSN)
620 				cacr |= 4;
621 			if (cache & FLUSH_CACHE_DATA)
622 				cacr |= 0x400;
623 			len >>= 2;
624 			while (len--) {
625 				__asm__ __volatile__ ("movec %1, %%caar\n\t"
626 						      "movec %0, %%cacr"
627 						      : /* no outputs */
628 						      : "r" (cacr), "r" (addr));
629 				addr += 4;
630 			}
631 		} else {
632 			/* Flush the whole cache, even if page granularity requested. */
633 			unsigned long cacr;
634 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
635 			if (cache & FLUSH_CACHE_INSN)
636 				cacr |= 8;
637 			if (cache & FLUSH_CACHE_DATA)
638 				cacr |= 0x800;
639 			__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
640 		}
641 		ret = 0;
642 		goto out;
643 	} else {
644 	    /*
645 	     * 040 or 060: don't blindly trust 'scope', someone could
646 	     * try to flush a few megs of memory.
647 	     */
648 
649 	    if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
650 	        scope=FLUSH_SCOPE_PAGE;
651 	    if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
652 	        scope=FLUSH_SCOPE_ALL;
653 	    if (CPU_IS_040) {
654 		ret = cache_flush_040 (addr, scope, cache, len);
655 	    } else if (CPU_IS_060) {
656 		ret = cache_flush_060 (addr, scope, cache, len);
657 	    }
658 	}
659 out:
660 	unlock_kernel();
661 	return ret;
662 }
663 
664 asmlinkage int sys_getpagesize(void)
665 {
666 	return PAGE_SIZE;
667 }
668 
669 /*
670  * Do a system call from kernel instead of calling sys_execve so we
671  * end up with proper pt_regs.
672  */
673 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
674 {
675 	register long __res asm ("%d0") = __NR_execve;
676 	register long __a asm ("%d1") = (long)(filename);
677 	register long __b asm ("%d2") = (long)(argv);
678 	register long __c asm ("%d3") = (long)(envp);
679 	asm volatile ("trap  #0" : "+d" (__res)
680 			: "d" (__a), "d" (__b), "d" (__c));
681 	return __res;
682 }
683