xref: /openbmc/linux/arch/m68k/kernel/sys_m68k.c (revision 384740dc) 
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 #include <linux/ipc.h>
25 
26 #include <asm/setup.h>
27 #include <asm/uaccess.h>
28 #include <asm/cachectl.h>
29 #include <asm/traps.h>
30 #include <asm/page.h>
31 #include <asm/unistd.h>
32 
33 /* common code for old and new mmaps */
34 static inline long do_mmap2(
35 	unsigned long addr, unsigned long len,
36 	unsigned long prot, unsigned long flags,
37 	unsigned long fd, unsigned long pgoff)
38 {
39 	int error = -EBADF;
40 	struct file * file = NULL;
41 
42 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
43 	if (!(flags & MAP_ANONYMOUS)) {
44 		file = fget(fd);
45 		if (!file)
46 			goto out;
47 	}
48 
49 	down_write(&current->mm->mmap_sem);
50 	error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
51 	up_write(&current->mm->mmap_sem);
52 
53 	if (file)
54 		fput(file);
55 out:
56 	return error;
57 }
58 
59 asmlinkage long sys_mmap2(unsigned long addr, unsigned long len,
60 	unsigned long prot, unsigned long flags,
61 	unsigned long fd, unsigned long pgoff)
62 {
63 	return do_mmap2(addr, len, prot, flags, fd, pgoff);
64 }
65 
66 /*
67  * Perform the select(nd, in, out, ex, tv) and mmap() system
68  * calls. Linux/m68k cloned Linux/i386, which didn't use to be able to
69  * handle more than 4 system call parameters, so these system calls
70  * used a memory block for parameter passing..
71  */
72 
73 struct mmap_arg_struct {
74 	unsigned long addr;
75 	unsigned long len;
76 	unsigned long prot;
77 	unsigned long flags;
78 	unsigned long fd;
79 	unsigned long offset;
80 };
81 
82 asmlinkage int old_mmap(struct mmap_arg_struct __user *arg)
83 {
84 	struct mmap_arg_struct a;
85 	int error = -EFAULT;
86 
87 	if (copy_from_user(&a, arg, sizeof(a)))
88 		goto out;
89 
90 	error = -EINVAL;
91 	if (a.offset & ~PAGE_MASK)
92 		goto out;
93 
94 	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
95 
96 	error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
97 out:
98 	return error;
99 }
100 
101 #if 0
102 struct mmap_arg_struct64 {
103 	__u32 addr;
104 	__u32 len;
105 	__u32 prot;
106 	__u32 flags;
107 	__u64 offset; /* 64 bits */
108 	__u32 fd;
109 };
110 
111 asmlinkage long sys_mmap64(struct mmap_arg_struct64 *arg)
112 {
113 	int error = -EFAULT;
114 	struct file * file = NULL;
115 	struct mmap_arg_struct64 a;
116 	unsigned long pgoff;
117 
118 	if (copy_from_user(&a, arg, sizeof(a)))
119 		return -EFAULT;
120 
121 	if ((long)a.offset & ~PAGE_MASK)
122 		return -EINVAL;
123 
124 	pgoff = a.offset >> PAGE_SHIFT;
125 	if ((a.offset >> PAGE_SHIFT) != pgoff)
126 		return -EINVAL;
127 
128 	if (!(a.flags & MAP_ANONYMOUS)) {
129 		error = -EBADF;
130 		file = fget(a.fd);
131 		if (!file)
132 			goto out;
133 	}
134 	a.flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
135 
136 	down_write(&current->mm->mmap_sem);
137 	error = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags, pgoff);
138 	up_write(&current->mm->mmap_sem);
139 	if (file)
140 		fput(file);
141 out:
142 	return error;
143 }
144 #endif
145 
146 struct sel_arg_struct {
147 	unsigned long n;
148 	fd_set __user *inp, *outp, *exp;
149 	struct timeval __user *tvp;
150 };
151 
152 asmlinkage int old_select(struct sel_arg_struct __user *arg)
153 {
154 	struct sel_arg_struct a;
155 
156 	if (copy_from_user(&a, arg, sizeof(a)))
157 		return -EFAULT;
158 	/* sys_select() does the appropriate kernel locking */
159 	return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp);
160 }
161 
162 /*
163  * sys_ipc() is the de-multiplexer for the SysV IPC calls..
164  *
165  * This is really horribly ugly.
166  */
167 asmlinkage int sys_ipc (uint call, int first, int second,
168 			int third, void __user *ptr, long fifth)
169 {
170 	int version, ret;
171 
172 	version = call >> 16; /* hack for backward compatibility */
173 	call &= 0xffff;
174 
175 	if (call <= SEMCTL)
176 		switch (call) {
177 		case SEMOP:
178 			return sys_semop (first, ptr, second);
179 		case SEMGET:
180 			return sys_semget (first, second, third);
181 		case SEMCTL: {
182 			union semun fourth;
183 			if (!ptr)
184 				return -EINVAL;
185 			if (get_user(fourth.__pad, (void __user *__user *) ptr))
186 				return -EFAULT;
187 			return sys_semctl (first, second, third, fourth);
188 			}
189 		default:
190 			return -ENOSYS;
191 		}
192 	if (call <= MSGCTL)
193 		switch (call) {
194 		case MSGSND:
195 			return sys_msgsnd (first, ptr, second, third);
196 		case MSGRCV:
197 			switch (version) {
198 			case 0: {
199 				struct ipc_kludge tmp;
200 				if (!ptr)
201 					return -EINVAL;
202 				if (copy_from_user (&tmp, ptr, sizeof (tmp)))
203 					return -EFAULT;
204 				return sys_msgrcv (first, tmp.msgp, second,
205 						   tmp.msgtyp, third);
206 				}
207 			default:
208 				return sys_msgrcv (first, ptr,
209 						   second, fifth, third);
210 			}
211 		case MSGGET:
212 			return sys_msgget ((key_t) first, second);
213 		case MSGCTL:
214 			return sys_msgctl (first, second, ptr);
215 		default:
216 			return -ENOSYS;
217 		}
218 	if (call <= SHMCTL)
219 		switch (call) {
220 		case SHMAT:
221 			switch (version) {
222 			default: {
223 				ulong raddr;
224 				ret = do_shmat (first, ptr, second, &raddr);
225 				if (ret)
226 					return ret;
227 				return put_user (raddr, (ulong __user *) third);
228 			}
229 			}
230 		case SHMDT:
231 			return sys_shmdt (ptr);
232 		case SHMGET:
233 			return sys_shmget (first, second, third);
234 		case SHMCTL:
235 			return sys_shmctl (first, second, ptr);
236 		default:
237 			return -ENOSYS;
238 		}
239 
240 	return -EINVAL;
241 }
242 
243 /* Convert virtual (user) address VADDR to physical address PADDR */
244 #define virt_to_phys_040(vaddr)						\
245 ({									\
246   unsigned long _mmusr, _paddr;						\
247 									\
248   __asm__ __volatile__ (".chip 68040\n\t"				\
249 			"ptestr (%1)\n\t"				\
250 			"movec %%mmusr,%0\n\t"				\
251 			".chip 68k"					\
252 			: "=r" (_mmusr)					\
253 			: "a" (vaddr));					\
254   _paddr = (_mmusr & MMU_R_040) ? (_mmusr & PAGE_MASK) : 0;		\
255   _paddr;								\
256 })
257 
258 static inline int
259 cache_flush_040 (unsigned long addr, int scope, int cache, unsigned long len)
260 {
261   unsigned long paddr, i;
262 
263   switch (scope)
264     {
265     case FLUSH_SCOPE_ALL:
266       switch (cache)
267 	{
268 	case FLUSH_CACHE_DATA:
269 	  /* This nop is needed for some broken versions of the 68040.  */
270 	  __asm__ __volatile__ ("nop\n\t"
271 				".chip 68040\n\t"
272 				"cpusha %dc\n\t"
273 				".chip 68k");
274 	  break;
275 	case FLUSH_CACHE_INSN:
276 	  __asm__ __volatile__ ("nop\n\t"
277 				".chip 68040\n\t"
278 				"cpusha %ic\n\t"
279 				".chip 68k");
280 	  break;
281 	default:
282 	case FLUSH_CACHE_BOTH:
283 	  __asm__ __volatile__ ("nop\n\t"
284 				".chip 68040\n\t"
285 				"cpusha %bc\n\t"
286 				".chip 68k");
287 	  break;
288 	}
289       break;
290 
291     case FLUSH_SCOPE_LINE:
292       /* Find the physical address of the first mapped page in the
293 	 address range.  */
294       if ((paddr = virt_to_phys_040(addr))) {
295         paddr += addr & ~(PAGE_MASK | 15);
296         len = (len + (addr & 15) + 15) >> 4;
297       } else {
298 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
299 
300 	if (len <= tmp)
301 	  return 0;
302 	addr += tmp;
303 	len -= tmp;
304 	tmp = PAGE_SIZE;
305 	for (;;)
306 	  {
307 	    if ((paddr = virt_to_phys_040(addr)))
308 	      break;
309 	    if (len <= tmp)
310 	      return 0;
311 	    addr += tmp;
312 	    len -= tmp;
313 	  }
314 	len = (len + 15) >> 4;
315       }
316       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
317       while (len--)
318 	{
319 	  switch (cache)
320 	    {
321 	    case FLUSH_CACHE_DATA:
322 	      __asm__ __volatile__ ("nop\n\t"
323 				    ".chip 68040\n\t"
324 				    "cpushl %%dc,(%0)\n\t"
325 				    ".chip 68k"
326 				    : : "a" (paddr));
327 	      break;
328 	    case FLUSH_CACHE_INSN:
329 	      __asm__ __volatile__ ("nop\n\t"
330 				    ".chip 68040\n\t"
331 				    "cpushl %%ic,(%0)\n\t"
332 				    ".chip 68k"
333 				    : : "a" (paddr));
334 	      break;
335 	    default:
336 	    case FLUSH_CACHE_BOTH:
337 	      __asm__ __volatile__ ("nop\n\t"
338 				    ".chip 68040\n\t"
339 				    "cpushl %%bc,(%0)\n\t"
340 				    ".chip 68k"
341 				    : : "a" (paddr));
342 	      break;
343 	    }
344 	  if (!--i && len)
345 	    {
346 	      /*
347 	       * No need to page align here since it is done by
348 	       * virt_to_phys_040().
349 	       */
350 	      addr += PAGE_SIZE;
351 	      i = PAGE_SIZE / 16;
352 	      /* Recompute physical address when crossing a page
353 	         boundary. */
354 	      for (;;)
355 		{
356 		  if ((paddr = virt_to_phys_040(addr)))
357 		    break;
358 		  if (len <= i)
359 		    return 0;
360 		  len -= i;
361 		  addr += PAGE_SIZE;
362 		}
363 	    }
364 	  else
365 	    paddr += 16;
366 	}
367       break;
368 
369     default:
370     case FLUSH_SCOPE_PAGE:
371       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
372       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
373 	{
374 	  if (!(paddr = virt_to_phys_040(addr)))
375 	    continue;
376 	  switch (cache)
377 	    {
378 	    case FLUSH_CACHE_DATA:
379 	      __asm__ __volatile__ ("nop\n\t"
380 				    ".chip 68040\n\t"
381 				    "cpushp %%dc,(%0)\n\t"
382 				    ".chip 68k"
383 				    : : "a" (paddr));
384 	      break;
385 	    case FLUSH_CACHE_INSN:
386 	      __asm__ __volatile__ ("nop\n\t"
387 				    ".chip 68040\n\t"
388 				    "cpushp %%ic,(%0)\n\t"
389 				    ".chip 68k"
390 				    : : "a" (paddr));
391 	      break;
392 	    default:
393 	    case FLUSH_CACHE_BOTH:
394 	      __asm__ __volatile__ ("nop\n\t"
395 				    ".chip 68040\n\t"
396 				    "cpushp %%bc,(%0)\n\t"
397 				    ".chip 68k"
398 				    : : "a" (paddr));
399 	      break;
400 	    }
401 	}
402       break;
403     }
404   return 0;
405 }
406 
407 #define virt_to_phys_060(vaddr)				\
408 ({							\
409   unsigned long paddr;					\
410   __asm__ __volatile__ (".chip 68060\n\t"		\
411 			"plpar (%0)\n\t"		\
412 			".chip 68k"			\
413 			: "=a" (paddr)			\
414 			: "0" (vaddr));			\
415   (paddr); /* XXX */					\
416 })
417 
418 static inline int
419 cache_flush_060 (unsigned long addr, int scope, int cache, unsigned long len)
420 {
421   unsigned long paddr, i;
422 
423   /*
424    * 68060 manual says:
425    *  cpush %dc : flush DC, remains valid (with our %cacr setup)
426    *  cpush %ic : invalidate IC
427    *  cpush %bc : flush DC + invalidate IC
428    */
429   switch (scope)
430     {
431     case FLUSH_SCOPE_ALL:
432       switch (cache)
433 	{
434 	case FLUSH_CACHE_DATA:
435 	  __asm__ __volatile__ (".chip 68060\n\t"
436 				"cpusha %dc\n\t"
437 				".chip 68k");
438 	  break;
439 	case FLUSH_CACHE_INSN:
440 	  __asm__ __volatile__ (".chip 68060\n\t"
441 				"cpusha %ic\n\t"
442 				".chip 68k");
443 	  break;
444 	default:
445 	case FLUSH_CACHE_BOTH:
446 	  __asm__ __volatile__ (".chip 68060\n\t"
447 				"cpusha %bc\n\t"
448 				".chip 68k");
449 	  break;
450 	}
451       break;
452 
453     case FLUSH_SCOPE_LINE:
454       /* Find the physical address of the first mapped page in the
455 	 address range.  */
456       len += addr & 15;
457       addr &= -16;
458       if (!(paddr = virt_to_phys_060(addr))) {
459 	unsigned long tmp = PAGE_SIZE - (addr & ~PAGE_MASK);
460 
461 	if (len <= tmp)
462 	  return 0;
463 	addr += tmp;
464 	len -= tmp;
465 	tmp = PAGE_SIZE;
466 	for (;;)
467 	  {
468 	    if ((paddr = virt_to_phys_060(addr)))
469 	      break;
470 	    if (len <= tmp)
471 	      return 0;
472 	    addr += tmp;
473 	    len -= tmp;
474 	  }
475       }
476       len = (len + 15) >> 4;
477       i = (PAGE_SIZE - (paddr & ~PAGE_MASK)) >> 4;
478       while (len--)
479 	{
480 	  switch (cache)
481 	    {
482 	    case FLUSH_CACHE_DATA:
483 	      __asm__ __volatile__ (".chip 68060\n\t"
484 				    "cpushl %%dc,(%0)\n\t"
485 				    ".chip 68k"
486 				    : : "a" (paddr));
487 	      break;
488 	    case FLUSH_CACHE_INSN:
489 	      __asm__ __volatile__ (".chip 68060\n\t"
490 				    "cpushl %%ic,(%0)\n\t"
491 				    ".chip 68k"
492 				    : : "a" (paddr));
493 	      break;
494 	    default:
495 	    case FLUSH_CACHE_BOTH:
496 	      __asm__ __volatile__ (".chip 68060\n\t"
497 				    "cpushl %%bc,(%0)\n\t"
498 				    ".chip 68k"
499 				    : : "a" (paddr));
500 	      break;
501 	    }
502 	  if (!--i && len)
503 	    {
504 
505 	      /*
506 	       * We just want to jump to the first cache line
507 	       * in the next page.
508 	       */
509 	      addr += PAGE_SIZE;
510 	      addr &= PAGE_MASK;
511 
512 	      i = PAGE_SIZE / 16;
513 	      /* Recompute physical address when crossing a page
514 	         boundary. */
515 	      for (;;)
516 	        {
517 	          if ((paddr = virt_to_phys_060(addr)))
518 	            break;
519 	          if (len <= i)
520 	            return 0;
521 	          len -= i;
522 	          addr += PAGE_SIZE;
523 	        }
524 	    }
525 	  else
526 	    paddr += 16;
527 	}
528       break;
529 
530     default:
531     case FLUSH_SCOPE_PAGE:
532       len += (addr & ~PAGE_MASK) + (PAGE_SIZE - 1);
533       addr &= PAGE_MASK;	/* Workaround for bug in some
534 				   revisions of the 68060 */
535       for (len >>= PAGE_SHIFT; len--; addr += PAGE_SIZE)
536 	{
537 	  if (!(paddr = virt_to_phys_060(addr)))
538 	    continue;
539 	  switch (cache)
540 	    {
541 	    case FLUSH_CACHE_DATA:
542 	      __asm__ __volatile__ (".chip 68060\n\t"
543 				    "cpushp %%dc,(%0)\n\t"
544 				    ".chip 68k"
545 				    : : "a" (paddr));
546 	      break;
547 	    case FLUSH_CACHE_INSN:
548 	      __asm__ __volatile__ (".chip 68060\n\t"
549 				    "cpushp %%ic,(%0)\n\t"
550 				    ".chip 68k"
551 				    : : "a" (paddr));
552 	      break;
553 	    default:
554 	    case FLUSH_CACHE_BOTH:
555 	      __asm__ __volatile__ (".chip 68060\n\t"
556 				    "cpushp %%bc,(%0)\n\t"
557 				    ".chip 68k"
558 				    : : "a" (paddr));
559 	      break;
560 	    }
561 	}
562       break;
563     }
564   return 0;
565 }
566 
567 /* sys_cacheflush -- flush (part of) the processor cache.  */
568 asmlinkage int
569 sys_cacheflush (unsigned long addr, int scope, int cache, unsigned long len)
570 {
571 	struct vm_area_struct *vma;
572 	int ret = -EINVAL;
573 
574 	lock_kernel();
575 	if (scope < FLUSH_SCOPE_LINE || scope > FLUSH_SCOPE_ALL ||
576 	    cache & ~FLUSH_CACHE_BOTH)
577 		goto out;
578 
579 	if (scope == FLUSH_SCOPE_ALL) {
580 		/* Only the superuser may explicitly flush the whole cache. */
581 		ret = -EPERM;
582 		if (!capable(CAP_SYS_ADMIN))
583 			goto out;
584 	} else {
585 		/*
586 		 * Verify that the specified address region actually belongs
587 		 * to this process.
588 		 */
589 		vma = find_vma (current->mm, addr);
590 		ret = -EINVAL;
591 		/* Check for overflow.  */
592 		if (addr + len < addr)
593 			goto out;
594 		if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end)
595 			goto out;
596 	}
597 
598 	if (CPU_IS_020_OR_030) {
599 		if (scope == FLUSH_SCOPE_LINE && len < 256) {
600 			unsigned long cacr;
601 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
602 			if (cache & FLUSH_CACHE_INSN)
603 				cacr |= 4;
604 			if (cache & FLUSH_CACHE_DATA)
605 				cacr |= 0x400;
606 			len >>= 2;
607 			while (len--) {
608 				__asm__ __volatile__ ("movec %1, %%caar\n\t"
609 						      "movec %0, %%cacr"
610 						      : /* no outputs */
611 						      : "r" (cacr), "r" (addr));
612 				addr += 4;
613 			}
614 		} else {
615 			/* Flush the whole cache, even if page granularity requested. */
616 			unsigned long cacr;
617 			__asm__ ("movec %%cacr, %0" : "=r" (cacr));
618 			if (cache & FLUSH_CACHE_INSN)
619 				cacr |= 8;
620 			if (cache & FLUSH_CACHE_DATA)
621 				cacr |= 0x800;
622 			__asm__ __volatile__ ("movec %0, %%cacr" : : "r" (cacr));
623 		}
624 		ret = 0;
625 		goto out;
626 	} else {
627 	    /*
628 	     * 040 or 060: don't blindly trust 'scope', someone could
629 	     * try to flush a few megs of memory.
630 	     */
631 
632 	    if (len>=3*PAGE_SIZE && scope<FLUSH_SCOPE_PAGE)
633 	        scope=FLUSH_SCOPE_PAGE;
634 	    if (len>=10*PAGE_SIZE && scope<FLUSH_SCOPE_ALL)
635 	        scope=FLUSH_SCOPE_ALL;
636 	    if (CPU_IS_040) {
637 		ret = cache_flush_040 (addr, scope, cache, len);
638 	    } else if (CPU_IS_060) {
639 		ret = cache_flush_060 (addr, scope, cache, len);
640 	    }
641 	}
642 out:
643 	unlock_kernel();
644 	return ret;
645 }
646 
647 asmlinkage int sys_getpagesize(void)
648 {
649 	return PAGE_SIZE;
650 }
651 
652 /*
653  * Do a system call from kernel instead of calling sys_execve so we
654  * end up with proper pt_regs.
655  */
656 int kernel_execve(const char *filename, char *const argv[], char *const envp[])
657 {
658 	register long __res asm ("%d0") = __NR_execve;
659 	register long __a asm ("%d1") = (long)(filename);
660 	register long __b asm ("%d2") = (long)(argv);
661 	register long __c asm ("%d3") = (long)(envp);
662 	asm volatile ("trap  #0" : "+d" (__res)
663 			: "d" (__a), "d" (__b), "d" (__c));
664 	return __res;
665 }
666