xref: /linux/arch/alpha/kernel/osf_sys.c (revision d39d0ed196aa1685bb24771e92f78633c66ac9cb)
1 /*
2  *  linux/arch/alpha/kernel/osf_sys.c
3  *
4  *  Copyright (C) 1995  Linus Torvalds
5  */
6 
7 /*
8  * This file handles some of the stranger OSF/1 system call interfaces.
9  * Some of the system calls expect a non-C calling standard, others have
10  * special parameter blocks..
11  */
12 
13 #include <linux/errno.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/smp.h>
18 #include <linux/smp_lock.h>
19 #include <linux/stddef.h>
20 #include <linux/syscalls.h>
21 #include <linux/unistd.h>
22 #include <linux/ptrace.h>
23 #include <linux/user.h>
24 #include <linux/utsname.h>
25 #include <linux/time.h>
26 #include <linux/timex.h>
27 #include <linux/major.h>
28 #include <linux/stat.h>
29 #include <linux/mman.h>
30 #include <linux/shm.h>
31 #include <linux/poll.h>
32 #include <linux/file.h>
33 #include <linux/types.h>
34 #include <linux/ipc.h>
35 #include <linux/namei.h>
36 #include <linux/uio.h>
37 #include <linux/vfs.h>
38 #include <linux/rcupdate.h>
39 #include <linux/slab.h>
40 
41 #include <asm/fpu.h>
42 #include <asm/io.h>
43 #include <asm/uaccess.h>
44 #include <asm/system.h>
45 #include <asm/sysinfo.h>
46 #include <asm/hwrpb.h>
47 #include <asm/processor.h>
48 
49 /*
50  * Brk needs to return an error.  Still support Linux's brk(0) query idiom,
51  * which OSF programs just shouldn't be doing.  We're still not quite
52  * identical to OSF as we don't return 0 on success, but doing otherwise
53  * would require changes to libc.  Hopefully this is good enough.
54  */
55 SYSCALL_DEFINE1(osf_brk, unsigned long, brk)
56 {
57 	unsigned long retval = sys_brk(brk);
58 	if (brk && brk != retval)
59 		retval = -ENOMEM;
60 	return retval;
61 }
62 
63 /*
64  * This is pure guess-work..
65  */
66 SYSCALL_DEFINE4(osf_set_program_attributes, unsigned long, text_start,
67 		unsigned long, text_len, unsigned long, bss_start,
68 		unsigned long, bss_len)
69 {
70 	struct mm_struct *mm;
71 
72 	lock_kernel();
73 	mm = current->mm;
74 	mm->end_code = bss_start + bss_len;
75 	mm->start_brk = bss_start + bss_len;
76 	mm->brk = bss_start + bss_len;
77 #if 0
78 	printk("set_program_attributes(%lx %lx %lx %lx)\n",
79 		text_start, text_len, bss_start, bss_len);
80 #endif
81 	unlock_kernel();
82 	return 0;
83 }
84 
85 /*
86  * OSF/1 directory handling functions...
87  *
88  * The "getdents()" interface is much more sane: the "basep" stuff is
89  * braindamage (it can't really handle filesystems where the directory
90  * offset differences aren't the same as "d_reclen").
91  */
92 #define NAME_OFFSET	offsetof (struct osf_dirent, d_name)
93 
94 struct osf_dirent {
95 	unsigned int d_ino;
96 	unsigned short d_reclen;
97 	unsigned short d_namlen;
98 	char d_name[1];
99 };
100 
101 struct osf_dirent_callback {
102 	struct osf_dirent __user *dirent;
103 	long __user *basep;
104 	unsigned int count;
105 	int error;
106 };
107 
108 static int
109 osf_filldir(void *__buf, const char *name, int namlen, loff_t offset,
110 	    u64 ino, unsigned int d_type)
111 {
112 	struct osf_dirent __user *dirent;
113 	struct osf_dirent_callback *buf = (struct osf_dirent_callback *) __buf;
114 	unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32));
115 	unsigned int d_ino;
116 
117 	buf->error = -EINVAL;	/* only used if we fail */
118 	if (reclen > buf->count)
119 		return -EINVAL;
120 	d_ino = ino;
121 	if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
122 		buf->error = -EOVERFLOW;
123 		return -EOVERFLOW;
124 	}
125 	if (buf->basep) {
126 		if (put_user(offset, buf->basep))
127 			goto Efault;
128 		buf->basep = NULL;
129 	}
130 	dirent = buf->dirent;
131 	if (put_user(d_ino, &dirent->d_ino) ||
132 	    put_user(namlen, &dirent->d_namlen) ||
133 	    put_user(reclen, &dirent->d_reclen) ||
134 	    copy_to_user(dirent->d_name, name, namlen) ||
135 	    put_user(0, dirent->d_name + namlen))
136 		goto Efault;
137 	dirent = (void __user *)dirent + reclen;
138 	buf->dirent = dirent;
139 	buf->count -= reclen;
140 	return 0;
141 Efault:
142 	buf->error = -EFAULT;
143 	return -EFAULT;
144 }
145 
146 SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
147 		struct osf_dirent __user *, dirent, unsigned int, count,
148 		long __user *, basep)
149 {
150 	int error;
151 	struct file *file;
152 	struct osf_dirent_callback buf;
153 
154 	error = -EBADF;
155 	file = fget(fd);
156 	if (!file)
157 		goto out;
158 
159 	buf.dirent = dirent;
160 	buf.basep = basep;
161 	buf.count = count;
162 	buf.error = 0;
163 
164 	error = vfs_readdir(file, osf_filldir, &buf);
165 	if (error >= 0)
166 		error = buf.error;
167 	if (count != buf.count)
168 		error = count - buf.count;
169 
170 	fput(file);
171  out:
172 	return error;
173 }
174 
175 #undef NAME_OFFSET
176 
177 SYSCALL_DEFINE6(osf_mmap, unsigned long, addr, unsigned long, len,
178 		unsigned long, prot, unsigned long, flags, unsigned long, fd,
179 		unsigned long, off)
180 {
181 	unsigned long ret = -EINVAL;
182 
183 #if 0
184 	if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
185 		printk("%s: unimplemented OSF mmap flags %04lx\n",
186 			current->comm, flags);
187 #endif
188 	if ((off + PAGE_ALIGN(len)) < off)
189 		goto out;
190 	if (off & ~PAGE_MASK)
191 		goto out;
192 	ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
193  out:
194 	return ret;
195 }
196 
197 
198 /*
199  * The OSF/1 statfs structure is much larger, but this should
200  * match the beginning, at least.
201  */
202 struct osf_statfs {
203 	short f_type;
204 	short f_flags;
205 	int f_fsize;
206 	int f_bsize;
207 	int f_blocks;
208 	int f_bfree;
209 	int f_bavail;
210 	int f_files;
211 	int f_ffree;
212 	__kernel_fsid_t f_fsid;
213 };
214 
215 static int
216 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat,
217 		    unsigned long bufsiz)
218 {
219 	struct osf_statfs tmp_stat;
220 
221 	tmp_stat.f_type = linux_stat->f_type;
222 	tmp_stat.f_flags = 0;	/* mount flags */
223 	tmp_stat.f_fsize = linux_stat->f_frsize;
224 	tmp_stat.f_bsize = linux_stat->f_bsize;
225 	tmp_stat.f_blocks = linux_stat->f_blocks;
226 	tmp_stat.f_bfree = linux_stat->f_bfree;
227 	tmp_stat.f_bavail = linux_stat->f_bavail;
228 	tmp_stat.f_files = linux_stat->f_files;
229 	tmp_stat.f_ffree = linux_stat->f_ffree;
230 	tmp_stat.f_fsid = linux_stat->f_fsid;
231 	if (bufsiz > sizeof(tmp_stat))
232 		bufsiz = sizeof(tmp_stat);
233 	return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
234 }
235 
236 static int
237 do_osf_statfs(struct path *path, struct osf_statfs __user *buffer,
238 	      unsigned long bufsiz)
239 {
240 	struct kstatfs linux_stat;
241 	int error = vfs_statfs(path, &linux_stat);
242 	if (!error)
243 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
244 	return error;
245 }
246 
247 SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
248 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
249 {
250 	struct path path;
251 	int retval;
252 
253 	retval = user_path(pathname, &path);
254 	if (!retval) {
255 		retval = do_osf_statfs(&path buffer, bufsiz);
256 		path_put(&path);
257 	}
258 	return retval;
259 }
260 
261 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd,
262 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
263 {
264 	struct file *file;
265 	int retval;
266 
267 	retval = -EBADF;
268 	file = fget(fd);
269 	if (file) {
270 		retval = do_osf_statfs(&file->f_path, buffer, bufsiz);
271 		fput(file);
272 	}
273 	return retval;
274 }
275 
276 /*
277  * Uhh.. OSF/1 mount parameters aren't exactly obvious..
278  *
279  * Although to be frank, neither are the native Linux/i386 ones..
280  */
281 struct ufs_args {
282 	char __user *devname;
283 	int flags;
284 	uid_t exroot;
285 };
286 
287 struct cdfs_args {
288 	char __user *devname;
289 	int flags;
290 	uid_t exroot;
291 
292 	/* This has lots more here, which Linux handles with the option block
293 	   but I'm too lazy to do the translation into ASCII.  */
294 };
295 
296 struct procfs_args {
297 	char __user *devname;
298 	int flags;
299 	uid_t exroot;
300 };
301 
302 /*
303  * We can't actually handle ufs yet, so we translate UFS mounts to
304  * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
305  * layout is so braindead it's a major headache doing it.
306  *
307  * Just how long ago was it written? OTOH our UFS driver may be still
308  * unhappy with OSF UFS. [CHECKME]
309  */
310 static int
311 osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
312 {
313 	int retval;
314 	struct cdfs_args tmp;
315 	char *devname;
316 
317 	retval = -EFAULT;
318 	if (copy_from_user(&tmp, args, sizeof(tmp)))
319 		goto out;
320 	devname = getname(tmp.devname);
321 	retval = PTR_ERR(devname);
322 	if (IS_ERR(devname))
323 		goto out;
324 	retval = do_mount(devname, dirname, "ext2", flags, NULL);
325 	putname(devname);
326  out:
327 	return retval;
328 }
329 
330 static int
331 osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
332 {
333 	int retval;
334 	struct cdfs_args tmp;
335 	char *devname;
336 
337 	retval = -EFAULT;
338 	if (copy_from_user(&tmp, args, sizeof(tmp)))
339 		goto out;
340 	devname = getname(tmp.devname);
341 	retval = PTR_ERR(devname);
342 	if (IS_ERR(devname))
343 		goto out;
344 	retval = do_mount(devname, dirname, "iso9660", flags, NULL);
345 	putname(devname);
346  out:
347 	return retval;
348 }
349 
350 static int
351 osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
352 {
353 	struct procfs_args tmp;
354 
355 	if (copy_from_user(&tmp, args, sizeof(tmp)))
356 		return -EFAULT;
357 
358 	return do_mount("", dirname, "proc", flags, NULL);
359 }
360 
361 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
362 		int, flag, void __user *, data)
363 {
364 	int retval;
365 	char *name;
366 
367 	name = getname(path);
368 	retval = PTR_ERR(name);
369 	if (IS_ERR(name))
370 		goto out;
371 	switch (typenr) {
372 	case 1:
373 		retval = osf_ufs_mount(name, data, flag);
374 		break;
375 	case 6:
376 		retval = osf_cdfs_mount(name, data, flag);
377 		break;
378 	case 9:
379 		retval = osf_procfs_mount(name, data, flag);
380 		break;
381 	default:
382 		retval = -EINVAL;
383 		printk("osf_mount(%ld, %x)\n", typenr, flag);
384 	}
385 	putname(name);
386  out:
387 	return retval;
388 }
389 
390 SYSCALL_DEFINE1(osf_utsname, char __user *, name)
391 {
392 	int error;
393 
394 	down_read(&uts_sem);
395 	error = -EFAULT;
396 	if (copy_to_user(name + 0, utsname()->sysname, 32))
397 		goto out;
398 	if (copy_to_user(name + 32, utsname()->nodename, 32))
399 		goto out;
400 	if (copy_to_user(name + 64, utsname()->release, 32))
401 		goto out;
402 	if (copy_to_user(name + 96, utsname()->version, 32))
403 		goto out;
404 	if (copy_to_user(name + 128, utsname()->machine, 32))
405 		goto out;
406 
407 	error = 0;
408  out:
409 	up_read(&uts_sem);
410 	return error;
411 }
412 
413 SYSCALL_DEFINE0(getpagesize)
414 {
415 	return PAGE_SIZE;
416 }
417 
418 SYSCALL_DEFINE0(getdtablesize)
419 {
420 	return sysctl_nr_open;
421 }
422 
423 /*
424  * For compatibility with OSF/1 only.  Use utsname(2) instead.
425  */
426 SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
427 {
428 	unsigned len;
429 	int i;
430 
431 	if (!access_ok(VERIFY_WRITE, name, namelen))
432 		return -EFAULT;
433 
434 	len = namelen;
435 	if (namelen > 32)
436 		len = 32;
437 
438 	down_read(&uts_sem);
439 	for (i = 0; i < len; ++i) {
440 		__put_user(utsname()->domainname[i], name + i);
441 		if (utsname()->domainname[i] == '\0')
442 			break;
443 	}
444 	up_read(&uts_sem);
445 
446 	return 0;
447 }
448 
449 /*
450  * The following stuff should move into a header file should it ever
451  * be labeled "officially supported."  Right now, there is just enough
452  * support to avoid applications (such as tar) printing error
453  * messages.  The attributes are not really implemented.
454  */
455 
456 /*
457  * Values for Property list entry flag
458  */
459 #define PLE_PROPAGATE_ON_COPY		0x1	/* cp(1) will copy entry
460 						   by default */
461 #define PLE_FLAG_MASK			0x1	/* Valid flag values */
462 #define PLE_FLAG_ALL			-1	/* All flag value */
463 
464 struct proplistname_args {
465 	unsigned int pl_mask;
466 	unsigned int pl_numnames;
467 	char **pl_names;
468 };
469 
470 union pl_args {
471 	struct setargs {
472 		char __user *path;
473 		long follow;
474 		long nbytes;
475 		char __user *buf;
476 	} set;
477 	struct fsetargs {
478 		long fd;
479 		long nbytes;
480 		char __user *buf;
481 	} fset;
482 	struct getargs {
483 		char __user *path;
484 		long follow;
485 		struct proplistname_args __user *name_args;
486 		long nbytes;
487 		char __user *buf;
488 		int __user *min_buf_size;
489 	} get;
490 	struct fgetargs {
491 		long fd;
492 		struct proplistname_args __user *name_args;
493 		long nbytes;
494 		char __user *buf;
495 		int __user *min_buf_size;
496 	} fget;
497 	struct delargs {
498 		char __user *path;
499 		long follow;
500 		struct proplistname_args __user *name_args;
501 	} del;
502 	struct fdelargs {
503 		long fd;
504 		struct proplistname_args __user *name_args;
505 	} fdel;
506 };
507 
508 enum pl_code {
509 	PL_SET = 1, PL_FSET = 2,
510 	PL_GET = 3, PL_FGET = 4,
511 	PL_DEL = 5, PL_FDEL = 6
512 };
513 
514 SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code,
515 		union pl_args __user *, args)
516 {
517 	long error;
518 	int __user *min_buf_size_ptr;
519 
520 	lock_kernel();
521 	switch (code) {
522 	case PL_SET:
523 		if (get_user(error, &args->set.nbytes))
524 			error = -EFAULT;
525 		break;
526 	case PL_FSET:
527 		if (get_user(error, &args->fset.nbytes))
528 			error = -EFAULT;
529 		break;
530 	case PL_GET:
531 		error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
532 		if (error)
533 			break;
534 		error = put_user(0, min_buf_size_ptr);
535 		break;
536 	case PL_FGET:
537 		error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
538 		if (error)
539 			break;
540 		error = put_user(0, min_buf_size_ptr);
541 		break;
542 	case PL_DEL:
543 	case PL_FDEL:
544 		error = 0;
545 		break;
546 	default:
547 		error = -EOPNOTSUPP;
548 		break;
549 	};
550 	unlock_kernel();
551 	return error;
552 }
553 
554 SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss,
555 		struct sigstack __user *, uoss)
556 {
557 	unsigned long usp = rdusp();
558 	unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
559 	unsigned long oss_os = on_sig_stack(usp);
560 	int error;
561 
562 	if (uss) {
563 		void __user *ss_sp;
564 
565 		error = -EFAULT;
566 		if (get_user(ss_sp, &uss->ss_sp))
567 			goto out;
568 
569 		/* If the current stack was set with sigaltstack, don't
570 		   swap stacks while we are on it.  */
571 		error = -EPERM;
572 		if (current->sas_ss_sp && on_sig_stack(usp))
573 			goto out;
574 
575 		/* Since we don't know the extent of the stack, and we don't
576 		   track onstack-ness, but rather calculate it, we must
577 		   presume a size.  Ho hum this interface is lossy.  */
578 		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
579 		current->sas_ss_size = SIGSTKSZ;
580 	}
581 
582 	if (uoss) {
583 		error = -EFAULT;
584 		if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
585 		    || __put_user(oss_sp, &uoss->ss_sp)
586 		    || __put_user(oss_os, &uoss->ss_onstack))
587 			goto out;
588 	}
589 
590 	error = 0;
591  out:
592 	return error;
593 }
594 
595 SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
596 {
597 	char *sysinfo_table[] = {
598 		utsname()->sysname,
599 		utsname()->nodename,
600 		utsname()->release,
601 		utsname()->version,
602 		utsname()->machine,
603 		"alpha",	/* instruction set architecture */
604 		"dummy",	/* hardware serial number */
605 		"dummy",	/* hardware manufacturer */
606 		"dummy",	/* secure RPC domain */
607 	};
608 	unsigned long offset;
609 	char *res;
610 	long len, err = -EINVAL;
611 
612 	offset = command-1;
613 	if (offset >= ARRAY_SIZE(sysinfo_table)) {
614 		/* Digital UNIX has a few unpublished interfaces here */
615 		printk("sysinfo(%d)", command);
616 		goto out;
617 	}
618 
619 	down_read(&uts_sem);
620 	res = sysinfo_table[offset];
621 	len = strlen(res)+1;
622 	if (len > count)
623 		len = count;
624 	if (copy_to_user(buf, res, len))
625 		err = -EFAULT;
626 	else
627 		err = 0;
628 	up_read(&uts_sem);
629  out:
630 	return err;
631 }
632 
633 SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
634 		unsigned long, nbytes, int __user *, start, void __user *, arg)
635 {
636 	unsigned long w;
637 	struct percpu_struct *cpu;
638 
639 	switch (op) {
640 	case GSI_IEEE_FP_CONTROL:
641 		/* Return current software fp control & status bits.  */
642 		/* Note that DU doesn't verify available space here.  */
643 
644  		w = current_thread_info()->ieee_state & IEEE_SW_MASK;
645  		w = swcr_update_status(w, rdfpcr());
646 		if (put_user(w, (unsigned long __user *) buffer))
647 			return -EFAULT;
648 		return 0;
649 
650 	case GSI_IEEE_STATE_AT_SIGNAL:
651 		/*
652 		 * Not sure anybody will ever use this weird stuff.  These
653 		 * ops can be used (under OSF/1) to set the fpcr that should
654 		 * be used when a signal handler starts executing.
655 		 */
656 		break;
657 
658  	case GSI_UACPROC:
659 		if (nbytes < sizeof(unsigned int))
660 			return -EINVAL;
661  		w = (current_thread_info()->flags >> UAC_SHIFT) & UAC_BITMASK;
662  		if (put_user(w, (unsigned int __user *)buffer))
663  			return -EFAULT;
664  		return 1;
665 
666 	case GSI_PROC_TYPE:
667 		if (nbytes < sizeof(unsigned long))
668 			return -EINVAL;
669 		cpu = (struct percpu_struct*)
670 		  ((char*)hwrpb + hwrpb->processor_offset);
671 		w = cpu->type;
672 		if (put_user(w, (unsigned long  __user*)buffer))
673 			return -EFAULT;
674 		return 1;
675 
676 	case GSI_GET_HWRPB:
677 		if (nbytes < sizeof(*hwrpb))
678 			return -EINVAL;
679 		if (copy_to_user(buffer, hwrpb, nbytes) != 0)
680 			return -EFAULT;
681 		return 1;
682 
683 	default:
684 		break;
685 	}
686 
687 	return -EOPNOTSUPP;
688 }
689 
690 SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
691 		unsigned long, nbytes, int __user *, start, void __user *, arg)
692 {
693 	switch (op) {
694 	case SSI_IEEE_FP_CONTROL: {
695 		unsigned long swcr, fpcr;
696 		unsigned int *state;
697 
698 		/*
699 		 * Alpha Architecture Handbook 4.7.7.3:
700 		 * To be fully IEEE compiant, we must track the current IEEE
701 		 * exception state in software, because spurious bits can be
702 		 * set in the trap shadow of a software-complete insn.
703 		 */
704 
705 		if (get_user(swcr, (unsigned long __user *)buffer))
706 			return -EFAULT;
707 		state = &current_thread_info()->ieee_state;
708 
709 		/* Update softare trap enable bits.  */
710 		*state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);
711 
712 		/* Update the real fpcr.  */
713 		fpcr = rdfpcr() & FPCR_DYN_MASK;
714 		fpcr |= ieee_swcr_to_fpcr(swcr);
715 		wrfpcr(fpcr);
716 
717 		return 0;
718 	}
719 
720 	case SSI_IEEE_RAISE_EXCEPTION: {
721 		unsigned long exc, swcr, fpcr, fex;
722 		unsigned int *state;
723 
724 		if (get_user(exc, (unsigned long __user *)buffer))
725 			return -EFAULT;
726 		state = &current_thread_info()->ieee_state;
727 		exc &= IEEE_STATUS_MASK;
728 
729 		/* Update softare trap enable bits.  */
730  		swcr = (*state & IEEE_SW_MASK) | exc;
731 		*state |= exc;
732 
733 		/* Update the real fpcr.  */
734 		fpcr = rdfpcr();
735 		fpcr |= ieee_swcr_to_fpcr(swcr);
736 		wrfpcr(fpcr);
737 
738  		/* If any exceptions set by this call, and are unmasked,
739 		   send a signal.  Old exceptions are not signaled.  */
740 		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
741  		if (fex) {
742 			siginfo_t info;
743 			int si_code = 0;
744 
745 			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
746 			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
747 			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
748 			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
749 			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
750 			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
751 
752 			info.si_signo = SIGFPE;
753 			info.si_errno = 0;
754 			info.si_code = si_code;
755 			info.si_addr = NULL;  /* FIXME */
756  			send_sig_info(SIGFPE, &info, current);
757  		}
758 		return 0;
759 	}
760 
761 	case SSI_IEEE_STATE_AT_SIGNAL:
762 	case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
763 		/*
764 		 * Not sure anybody will ever use this weird stuff.  These
765 		 * ops can be used (under OSF/1) to set the fpcr that should
766 		 * be used when a signal handler starts executing.
767 		 */
768 		break;
769 
770  	case SSI_NVPAIRS: {
771 		unsigned long v, w, i;
772 		unsigned int old, new;
773 
774  		for (i = 0; i < nbytes; ++i) {
775 
776  			if (get_user(v, 2*i + (unsigned int __user *)buffer))
777  				return -EFAULT;
778  			if (get_user(w, 2*i + 1 + (unsigned int __user *)buffer))
779  				return -EFAULT;
780  			switch (v) {
781  			case SSIN_UACPROC:
782 			again:
783 				old = current_thread_info()->flags;
784 				new = old & ~(UAC_BITMASK << UAC_SHIFT);
785 				new = new | (w & UAC_BITMASK) << UAC_SHIFT;
786 				if (cmpxchg(&current_thread_info()->flags,
787 					    old, new) != old)
788 					goto again;
789  				break;
790 
791  			default:
792  				return -EOPNOTSUPP;
793  			}
794  		}
795  		return 0;
796 	}
797 
798 	default:
799 		break;
800 	}
801 
802 	return -EOPNOTSUPP;
803 }
804 
805 /* Translations due to the fact that OSF's time_t is an int.  Which
806    affects all sorts of things, like timeval and itimerval.  */
807 
808 extern struct timezone sys_tz;
809 
810 struct timeval32
811 {
812     int tv_sec, tv_usec;
813 };
814 
815 struct itimerval32
816 {
817     struct timeval32 it_interval;
818     struct timeval32 it_value;
819 };
820 
821 static inline long
822 get_tv32(struct timeval *o, struct timeval32 __user *i)
823 {
824 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
825 		(__get_user(o->tv_sec, &i->tv_sec) |
826 		 __get_user(o->tv_usec, &i->tv_usec)));
827 }
828 
829 static inline long
830 put_tv32(struct timeval32 __user *o, struct timeval *i)
831 {
832 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
833 		(__put_user(i->tv_sec, &o->tv_sec) |
834 		 __put_user(i->tv_usec, &o->tv_usec)));
835 }
836 
837 static inline long
838 get_it32(struct itimerval *o, struct itimerval32 __user *i)
839 {
840 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
841 		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
842 		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
843 		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
844 		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
845 }
846 
847 static inline long
848 put_it32(struct itimerval32 __user *o, struct itimerval *i)
849 {
850 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
851 		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
852 		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
853 		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
854 		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
855 }
856 
857 static inline void
858 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
859 {
860 	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
861 	value->tv_sec = jiffies / HZ;
862 }
863 
864 SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv,
865 		struct timezone __user *, tz)
866 {
867 	if (tv) {
868 		struct timeval ktv;
869 		do_gettimeofday(&ktv);
870 		if (put_tv32(tv, &ktv))
871 			return -EFAULT;
872 	}
873 	if (tz) {
874 		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
875 			return -EFAULT;
876 	}
877 	return 0;
878 }
879 
880 SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv,
881 		struct timezone __user *, tz)
882 {
883 	struct timespec kts;
884 	struct timezone ktz;
885 
886  	if (tv) {
887 		if (get_tv32((struct timeval *)&kts, tv))
888 			return -EFAULT;
889 	}
890 	if (tz) {
891 		if (copy_from_user(&ktz, tz, sizeof(*tz)))
892 			return -EFAULT;
893 	}
894 
895 	kts.tv_nsec *= 1000;
896 
897 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
898 }
899 
900 SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it)
901 {
902 	struct itimerval kit;
903 	int error;
904 
905 	error = do_getitimer(which, &kit);
906 	if (!error && put_it32(it, &kit))
907 		error = -EFAULT;
908 
909 	return error;
910 }
911 
912 SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in,
913 		struct itimerval32 __user *, out)
914 {
915 	struct itimerval kin, kout;
916 	int error;
917 
918 	if (in) {
919 		if (get_it32(&kin, in))
920 			return -EFAULT;
921 	} else
922 		memset(&kin, 0, sizeof(kin));
923 
924 	error = do_setitimer(which, &kin, out ? &kout : NULL);
925 	if (error || !out)
926 		return error;
927 
928 	if (put_it32(out, &kout))
929 		return -EFAULT;
930 
931 	return 0;
932 
933 }
934 
935 SYSCALL_DEFINE2(osf_utimes, const char __user *, filename,
936 		struct timeval32 __user *, tvs)
937 {
938 	struct timespec tv[2];
939 
940 	if (tvs) {
941 		struct timeval ktvs[2];
942 		if (get_tv32(&ktvs[0], &tvs[0]) ||
943 		    get_tv32(&ktvs[1], &tvs[1]))
944 			return -EFAULT;
945 
946 		if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 ||
947 		    ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000)
948 			return -EINVAL;
949 
950 		tv[0].tv_sec = ktvs[0].tv_sec;
951 		tv[0].tv_nsec = 1000 * ktvs[0].tv_usec;
952 		tv[1].tv_sec = ktvs[1].tv_sec;
953 		tv[1].tv_nsec = 1000 * ktvs[1].tv_usec;
954 	}
955 
956 	return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0);
957 }
958 
959 #define MAX_SELECT_SECONDS \
960 	((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
961 
962 SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp,
963 		fd_set __user *, exp, struct timeval32 __user *, tvp)
964 {
965 	struct timespec end_time, *to = NULL;
966 	if (tvp) {
967 		time_t sec, usec;
968 
969 		to = &end_time;
970 
971 		if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
972 		    || __get_user(sec, &tvp->tv_sec)
973 		    || __get_user(usec, &tvp->tv_usec)) {
974 		    	return -EFAULT;
975 		}
976 
977 		if (sec < 0 || usec < 0)
978 			return -EINVAL;
979 
980 		if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC))
981 			return -EINVAL;
982 
983 	}
984 
985 	/* OSF does not copy back the remaining time.  */
986 	return core_sys_select(n, inp, outp, exp, to);
987 }
988 
989 struct rusage32 {
990 	struct timeval32 ru_utime;	/* user time used */
991 	struct timeval32 ru_stime;	/* system time used */
992 	long	ru_maxrss;		/* maximum resident set size */
993 	long	ru_ixrss;		/* integral shared memory size */
994 	long	ru_idrss;		/* integral unshared data size */
995 	long	ru_isrss;		/* integral unshared stack size */
996 	long	ru_minflt;		/* page reclaims */
997 	long	ru_majflt;		/* page faults */
998 	long	ru_nswap;		/* swaps */
999 	long	ru_inblock;		/* block input operations */
1000 	long	ru_oublock;		/* block output operations */
1001 	long	ru_msgsnd;		/* messages sent */
1002 	long	ru_msgrcv;		/* messages received */
1003 	long	ru_nsignals;		/* signals received */
1004 	long	ru_nvcsw;		/* voluntary context switches */
1005 	long	ru_nivcsw;		/* involuntary " */
1006 };
1007 
1008 SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru)
1009 {
1010 	struct rusage32 r;
1011 
1012 	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
1013 		return -EINVAL;
1014 
1015 	memset(&r, 0, sizeof(r));
1016 	switch (who) {
1017 	case RUSAGE_SELF:
1018 		jiffies_to_timeval32(current->utime, &r.ru_utime);
1019 		jiffies_to_timeval32(current->stime, &r.ru_stime);
1020 		r.ru_minflt = current->min_flt;
1021 		r.ru_majflt = current->maj_flt;
1022 		break;
1023 	case RUSAGE_CHILDREN:
1024 		jiffies_to_timeval32(current->signal->cutime, &r.ru_utime);
1025 		jiffies_to_timeval32(current->signal->cstime, &r.ru_stime);
1026 		r.ru_minflt = current->signal->cmin_flt;
1027 		r.ru_majflt = current->signal->cmaj_flt;
1028 		break;
1029 	}
1030 
1031 	return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1032 }
1033 
1034 SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
1035 		struct rusage32 __user *, ur)
1036 {
1037 	struct rusage r;
1038 	long ret, err;
1039 	mm_segment_t old_fs;
1040 
1041 	if (!ur)
1042 		return sys_wait4(pid, ustatus, options, NULL);
1043 
1044 	old_fs = get_fs();
1045 
1046 	set_fs (KERNEL_DS);
1047 	ret = sys_wait4(pid, ustatus, options, (struct rusage __user *) &r);
1048 	set_fs (old_fs);
1049 
1050 	if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
1051 		return -EFAULT;
1052 
1053 	err = 0;
1054 	err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
1055 	err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
1056 	err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
1057 	err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
1058 	err |= __put_user(r.ru_maxrss, &ur->ru_maxrss);
1059 	err |= __put_user(r.ru_ixrss, &ur->ru_ixrss);
1060 	err |= __put_user(r.ru_idrss, &ur->ru_idrss);
1061 	err |= __put_user(r.ru_isrss, &ur->ru_isrss);
1062 	err |= __put_user(r.ru_minflt, &ur->ru_minflt);
1063 	err |= __put_user(r.ru_majflt, &ur->ru_majflt);
1064 	err |= __put_user(r.ru_nswap, &ur->ru_nswap);
1065 	err |= __put_user(r.ru_inblock, &ur->ru_inblock);
1066 	err |= __put_user(r.ru_oublock, &ur->ru_oublock);
1067 	err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
1068 	err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
1069 	err |= __put_user(r.ru_nsignals, &ur->ru_nsignals);
1070 	err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
1071 	err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw);
1072 
1073 	return err ? err : ret;
1074 }
1075 
1076 /*
1077  * I don't know what the parameters are: the first one
1078  * seems to be a timeval pointer, and I suspect the second
1079  * one is the time remaining.. Ho humm.. No documentation.
1080  */
1081 SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep,
1082 		struct timeval32 __user *, remain)
1083 {
1084 	struct timeval tmp;
1085 	unsigned long ticks;
1086 
1087 	if (get_tv32(&tmp, sleep))
1088 		goto fault;
1089 
1090 	ticks = timeval_to_jiffies(&tmp);
1091 
1092 	ticks = schedule_timeout_interruptible(ticks);
1093 
1094 	if (remain) {
1095 		jiffies_to_timeval(ticks, &tmp);
1096 		if (put_tv32(remain, &tmp))
1097 			goto fault;
1098 	}
1099 
1100 	return 0;
1101  fault:
1102 	return -EFAULT;
1103 }
1104 
1105 
1106 struct timex32 {
1107 	unsigned int modes;	/* mode selector */
1108 	long offset;		/* time offset (usec) */
1109 	long freq;		/* frequency offset (scaled ppm) */
1110 	long maxerror;		/* maximum error (usec) */
1111 	long esterror;		/* estimated error (usec) */
1112 	int status;		/* clock command/status */
1113 	long constant;		/* pll time constant */
1114 	long precision;		/* clock precision (usec) (read only) */
1115 	long tolerance;		/* clock frequency tolerance (ppm)
1116 				 * (read only)
1117 				 */
1118 	struct timeval32 time;	/* (read only) */
1119 	long tick;		/* (modified) usecs between clock ticks */
1120 
1121 	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
1122 	long jitter;            /* pps jitter (us) (ro) */
1123 	int shift;              /* interval duration (s) (shift) (ro) */
1124 	long stabil;            /* pps stability (scaled ppm) (ro) */
1125 	long jitcnt;            /* jitter limit exceeded (ro) */
1126 	long calcnt;            /* calibration intervals (ro) */
1127 	long errcnt;            /* calibration errors (ro) */
1128 	long stbcnt;            /* stability limit exceeded (ro) */
1129 
1130 	int  :32; int  :32; int  :32; int  :32;
1131 	int  :32; int  :32; int  :32; int  :32;
1132 	int  :32; int  :32; int  :32; int  :32;
1133 };
1134 
1135 SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p)
1136 {
1137         struct timex txc;
1138 	int ret;
1139 
1140 	/* copy relevant bits of struct timex. */
1141 	if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
1142 	    copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) -
1143 			   offsetof(struct timex32, time)))
1144 	  return -EFAULT;
1145 
1146 	ret = do_adjtimex(&txc);
1147 	if (ret < 0)
1148 	  return ret;
1149 
1150 	/* copy back to timex32 */
1151 	if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
1152 	    (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) -
1153 			  offsetof(struct timex32, tick))) ||
1154 	    (put_tv32(&txc_p->time, &txc.time)))
1155 	  return -EFAULT;
1156 
1157 	return ret;
1158 }
1159 
1160 /* Get an address range which is currently unmapped.  Similar to the
1161    generic version except that we know how to honor ADDR_LIMIT_32BIT.  */
1162 
1163 static unsigned long
1164 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
1165 		         unsigned long limit)
1166 {
1167 	struct vm_area_struct *vma = find_vma(current->mm, addr);
1168 
1169 	while (1) {
1170 		/* At this point:  (!vma || addr < vma->vm_end). */
1171 		if (limit - len < addr)
1172 			return -ENOMEM;
1173 		if (!vma || addr + len <= vma->vm_start)
1174 			return addr;
1175 		addr = vma->vm_end;
1176 		vma = vma->vm_next;
1177 	}
1178 }
1179 
1180 unsigned long
1181 arch_get_unmapped_area(struct file *filp, unsigned long addr,
1182 		       unsigned long len, unsigned long pgoff,
1183 		       unsigned long flags)
1184 {
1185 	unsigned long limit;
1186 
1187 	/* "32 bit" actually means 31 bit, since pointers sign extend.  */
1188 	if (current->personality & ADDR_LIMIT_32BIT)
1189 		limit = 0x80000000;
1190 	else
1191 		limit = TASK_SIZE;
1192 
1193 	if (len > limit)
1194 		return -ENOMEM;
1195 
1196 	if (flags & MAP_FIXED)
1197 		return addr;
1198 
1199 	/* First, see if the given suggestion fits.
1200 
1201 	   The OSF/1 loader (/sbin/loader) relies on us returning an
1202 	   address larger than the requested if one exists, which is
1203 	   a terribly broken way to program.
1204 
1205 	   That said, I can see the use in being able to suggest not
1206 	   merely specific addresses, but regions of memory -- perhaps
1207 	   this feature should be incorporated into all ports?  */
1208 
1209 	if (addr) {
1210 		addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
1211 		if (addr != (unsigned long) -ENOMEM)
1212 			return addr;
1213 	}
1214 
1215 	/* Next, try allocating at TASK_UNMAPPED_BASE.  */
1216 	addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
1217 					 len, limit);
1218 	if (addr != (unsigned long) -ENOMEM)
1219 		return addr;
1220 
1221 	/* Finally, try allocating in low memory.  */
1222 	addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);
1223 
1224 	return addr;
1225 }
1226 
1227 #ifdef CONFIG_OSF4_COMPAT
1228 
1229 /* Clear top 32 bits of iov_len in the user's buffer for
1230    compatibility with old versions of OSF/1 where iov_len
1231    was defined as int. */
1232 static int
1233 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
1234 {
1235 	unsigned long i;
1236 
1237 	for (i = 0 ; i < count ; i++) {
1238 		int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;
1239 
1240 		if (put_user(0, iov_len_high))
1241 			return -EFAULT;
1242 	}
1243 	return 0;
1244 }
1245 
1246 SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
1247 		const struct iovec __user *, vector, unsigned long, count)
1248 {
1249 	if (unlikely(personality(current->personality) == PER_OSF4))
1250 		if (osf_fix_iov_len(vector, count))
1251 			return -EFAULT;
1252 	return sys_readv(fd, vector, count);
1253 }
1254 
1255 SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
1256 		const struct iovec __user *, vector, unsigned long, count)
1257 {
1258 	if (unlikely(personality(current->personality) == PER_OSF4))
1259 		if (osf_fix_iov_len(vector, count))
1260 			return -EFAULT;
1261 	return sys_writev(fd, vector, count);
1262 }
1263 
1264 #endif
1265