xref: /openbmc/linux/arch/alpha/kernel/osf_sys.c (revision fd589a8f)
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/slab.h>
24 #include <linux/user.h>
25 #include <linux/utsname.h>
26 #include <linux/time.h>
27 #include <linux/timex.h>
28 #include <linux/major.h>
29 #include <linux/stat.h>
30 #include <linux/mman.h>
31 #include <linux/shm.h>
32 #include <linux/poll.h>
33 #include <linux/file.h>
34 #include <linux/types.h>
35 #include <linux/ipc.h>
36 #include <linux/namei.h>
37 #include <linux/uio.h>
38 #include <linux/vfs.h>
39 #include <linux/rcupdate.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 	struct file *file = NULL;
182 	unsigned long ret = -EBADF;
183 
184 #if 0
185 	if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
186 		printk("%s: unimplemented OSF mmap flags %04lx\n",
187 			current->comm, flags);
188 #endif
189 	if (!(flags & MAP_ANONYMOUS)) {
190 		file = fget(fd);
191 		if (!file)
192 			goto out;
193 	}
194 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
195 	down_write(&current->mm->mmap_sem);
196 	ret = do_mmap(file, addr, len, prot, flags, off);
197 	up_write(&current->mm->mmap_sem);
198 	if (file)
199 		fput(file);
200  out:
201 	return ret;
202 }
203 
204 
205 /*
206  * The OSF/1 statfs structure is much larger, but this should
207  * match the beginning, at least.
208  */
209 struct osf_statfs {
210 	short f_type;
211 	short f_flags;
212 	int f_fsize;
213 	int f_bsize;
214 	int f_blocks;
215 	int f_bfree;
216 	int f_bavail;
217 	int f_files;
218 	int f_ffree;
219 	__kernel_fsid_t f_fsid;
220 };
221 
222 static int
223 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat,
224 		    unsigned long bufsiz)
225 {
226 	struct osf_statfs tmp_stat;
227 
228 	tmp_stat.f_type = linux_stat->f_type;
229 	tmp_stat.f_flags = 0;	/* mount flags */
230 	tmp_stat.f_fsize = linux_stat->f_frsize;
231 	tmp_stat.f_bsize = linux_stat->f_bsize;
232 	tmp_stat.f_blocks = linux_stat->f_blocks;
233 	tmp_stat.f_bfree = linux_stat->f_bfree;
234 	tmp_stat.f_bavail = linux_stat->f_bavail;
235 	tmp_stat.f_files = linux_stat->f_files;
236 	tmp_stat.f_ffree = linux_stat->f_ffree;
237 	tmp_stat.f_fsid = linux_stat->f_fsid;
238 	if (bufsiz > sizeof(tmp_stat))
239 		bufsiz = sizeof(tmp_stat);
240 	return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
241 }
242 
243 static int
244 do_osf_statfs(struct dentry * dentry, struct osf_statfs __user *buffer,
245 	      unsigned long bufsiz)
246 {
247 	struct kstatfs linux_stat;
248 	int error = vfs_statfs(dentry, &linux_stat);
249 	if (!error)
250 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
251 	return error;
252 }
253 
254 SYSCALL_DEFINE3(osf_statfs, char __user *, pathname,
255 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
256 {
257 	struct path path;
258 	int retval;
259 
260 	retval = user_path(pathname, &path);
261 	if (!retval) {
262 		retval = do_osf_statfs(path.dentry, buffer, bufsiz);
263 		path_put(&path);
264 	}
265 	return retval;
266 }
267 
268 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd,
269 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
270 {
271 	struct file *file;
272 	int retval;
273 
274 	retval = -EBADF;
275 	file = fget(fd);
276 	if (file) {
277 		retval = do_osf_statfs(file->f_path.dentry, buffer, bufsiz);
278 		fput(file);
279 	}
280 	return retval;
281 }
282 
283 /*
284  * Uhh.. OSF/1 mount parameters aren't exactly obvious..
285  *
286  * Although to be frank, neither are the native Linux/i386 ones..
287  */
288 struct ufs_args {
289 	char __user *devname;
290 	int flags;
291 	uid_t exroot;
292 };
293 
294 struct cdfs_args {
295 	char __user *devname;
296 	int flags;
297 	uid_t exroot;
298 
299 	/* This has lots more here, which Linux handles with the option block
300 	   but I'm too lazy to do the translation into ASCII.  */
301 };
302 
303 struct procfs_args {
304 	char __user *devname;
305 	int flags;
306 	uid_t exroot;
307 };
308 
309 /*
310  * We can't actually handle ufs yet, so we translate UFS mounts to
311  * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
312  * layout is so braindead it's a major headache doing it.
313  *
314  * Just how long ago was it written? OTOH our UFS driver may be still
315  * unhappy with OSF UFS. [CHECKME]
316  */
317 static int
318 osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
319 {
320 	int retval;
321 	struct cdfs_args tmp;
322 	char *devname;
323 
324 	retval = -EFAULT;
325 	if (copy_from_user(&tmp, args, sizeof(tmp)))
326 		goto out;
327 	devname = getname(tmp.devname);
328 	retval = PTR_ERR(devname);
329 	if (IS_ERR(devname))
330 		goto out;
331 	retval = do_mount(devname, dirname, "ext2", flags, NULL);
332 	putname(devname);
333  out:
334 	return retval;
335 }
336 
337 static int
338 osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
339 {
340 	int retval;
341 	struct cdfs_args tmp;
342 	char *devname;
343 
344 	retval = -EFAULT;
345 	if (copy_from_user(&tmp, args, sizeof(tmp)))
346 		goto out;
347 	devname = getname(tmp.devname);
348 	retval = PTR_ERR(devname);
349 	if (IS_ERR(devname))
350 		goto out;
351 	retval = do_mount(devname, dirname, "iso9660", flags, NULL);
352 	putname(devname);
353  out:
354 	return retval;
355 }
356 
357 static int
358 osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
359 {
360 	struct procfs_args tmp;
361 
362 	if (copy_from_user(&tmp, args, sizeof(tmp)))
363 		return -EFAULT;
364 
365 	return do_mount("", dirname, "proc", flags, NULL);
366 }
367 
368 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, char __user *, path,
369 		int, flag, void __user *, data)
370 {
371 	int retval = -EINVAL;
372 	char *name;
373 
374 	name = getname(path);
375 	retval = PTR_ERR(name);
376 	if (IS_ERR(name))
377 		goto out;
378 	switch (typenr) {
379 	case 1:
380 		retval = osf_ufs_mount(name, data, flag);
381 		break;
382 	case 6:
383 		retval = osf_cdfs_mount(name, data, flag);
384 		break;
385 	case 9:
386 		retval = osf_procfs_mount(name, data, flag);
387 		break;
388 	default:
389 		printk("osf_mount(%ld, %x)\n", typenr, flag);
390 	}
391 	putname(name);
392  out:
393 	return retval;
394 }
395 
396 SYSCALL_DEFINE1(osf_utsname, char __user *, name)
397 {
398 	int error;
399 
400 	down_read(&uts_sem);
401 	error = -EFAULT;
402 	if (copy_to_user(name + 0, utsname()->sysname, 32))
403 		goto out;
404 	if (copy_to_user(name + 32, utsname()->nodename, 32))
405 		goto out;
406 	if (copy_to_user(name + 64, utsname()->release, 32))
407 		goto out;
408 	if (copy_to_user(name + 96, utsname()->version, 32))
409 		goto out;
410 	if (copy_to_user(name + 128, utsname()->machine, 32))
411 		goto out;
412 
413 	error = 0;
414  out:
415 	up_read(&uts_sem);
416 	return error;
417 }
418 
419 SYSCALL_DEFINE0(getpagesize)
420 {
421 	return PAGE_SIZE;
422 }
423 
424 SYSCALL_DEFINE0(getdtablesize)
425 {
426 	return sysctl_nr_open;
427 }
428 
429 /*
430  * For compatibility with OSF/1 only.  Use utsname(2) instead.
431  */
432 SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
433 {
434 	unsigned len;
435 	int i;
436 
437 	if (!access_ok(VERIFY_WRITE, name, namelen))
438 		return -EFAULT;
439 
440 	len = namelen;
441 	if (namelen > 32)
442 		len = 32;
443 
444 	down_read(&uts_sem);
445 	for (i = 0; i < len; ++i) {
446 		__put_user(utsname()->domainname[i], name + i);
447 		if (utsname()->domainname[i] == '\0')
448 			break;
449 	}
450 	up_read(&uts_sem);
451 
452 	return 0;
453 }
454 
455 /*
456  * The following stuff should move into a header file should it ever
457  * be labeled "officially supported."  Right now, there is just enough
458  * support to avoid applications (such as tar) printing error
459  * messages.  The attributes are not really implemented.
460  */
461 
462 /*
463  * Values for Property list entry flag
464  */
465 #define PLE_PROPAGATE_ON_COPY		0x1	/* cp(1) will copy entry
466 						   by default */
467 #define PLE_FLAG_MASK			0x1	/* Valid flag values */
468 #define PLE_FLAG_ALL			-1	/* All flag value */
469 
470 struct proplistname_args {
471 	unsigned int pl_mask;
472 	unsigned int pl_numnames;
473 	char **pl_names;
474 };
475 
476 union pl_args {
477 	struct setargs {
478 		char __user *path;
479 		long follow;
480 		long nbytes;
481 		char __user *buf;
482 	} set;
483 	struct fsetargs {
484 		long fd;
485 		long nbytes;
486 		char __user *buf;
487 	} fset;
488 	struct getargs {
489 		char __user *path;
490 		long follow;
491 		struct proplistname_args __user *name_args;
492 		long nbytes;
493 		char __user *buf;
494 		int __user *min_buf_size;
495 	} get;
496 	struct fgetargs {
497 		long fd;
498 		struct proplistname_args __user *name_args;
499 		long nbytes;
500 		char __user *buf;
501 		int __user *min_buf_size;
502 	} fget;
503 	struct delargs {
504 		char __user *path;
505 		long follow;
506 		struct proplistname_args __user *name_args;
507 	} del;
508 	struct fdelargs {
509 		long fd;
510 		struct proplistname_args __user *name_args;
511 	} fdel;
512 };
513 
514 enum pl_code {
515 	PL_SET = 1, PL_FSET = 2,
516 	PL_GET = 3, PL_FGET = 4,
517 	PL_DEL = 5, PL_FDEL = 6
518 };
519 
520 SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code,
521 		union pl_args __user *, args)
522 {
523 	long error;
524 	int __user *min_buf_size_ptr;
525 
526 	lock_kernel();
527 	switch (code) {
528 	case PL_SET:
529 		if (get_user(error, &args->set.nbytes))
530 			error = -EFAULT;
531 		break;
532 	case PL_FSET:
533 		if (get_user(error, &args->fset.nbytes))
534 			error = -EFAULT;
535 		break;
536 	case PL_GET:
537 		error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
538 		if (error)
539 			break;
540 		error = put_user(0, min_buf_size_ptr);
541 		break;
542 	case PL_FGET:
543 		error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
544 		if (error)
545 			break;
546 		error = put_user(0, min_buf_size_ptr);
547 		break;
548 	case PL_DEL:
549 	case PL_FDEL:
550 		error = 0;
551 		break;
552 	default:
553 		error = -EOPNOTSUPP;
554 		break;
555 	};
556 	unlock_kernel();
557 	return error;
558 }
559 
560 SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss,
561 		struct sigstack __user *, uoss)
562 {
563 	unsigned long usp = rdusp();
564 	unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
565 	unsigned long oss_os = on_sig_stack(usp);
566 	int error;
567 
568 	if (uss) {
569 		void __user *ss_sp;
570 
571 		error = -EFAULT;
572 		if (get_user(ss_sp, &uss->ss_sp))
573 			goto out;
574 
575 		/* If the current stack was set with sigaltstack, don't
576 		   swap stacks while we are on it.  */
577 		error = -EPERM;
578 		if (current->sas_ss_sp && on_sig_stack(usp))
579 			goto out;
580 
581 		/* Since we don't know the extent of the stack, and we don't
582 		   track onstack-ness, but rather calculate it, we must
583 		   presume a size.  Ho hum this interface is lossy.  */
584 		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
585 		current->sas_ss_size = SIGSTKSZ;
586 	}
587 
588 	if (uoss) {
589 		error = -EFAULT;
590 		if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
591 		    || __put_user(oss_sp, &uoss->ss_sp)
592 		    || __put_user(oss_os, &uoss->ss_onstack))
593 			goto out;
594 	}
595 
596 	error = 0;
597  out:
598 	return error;
599 }
600 
601 SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
602 {
603 	char *sysinfo_table[] = {
604 		utsname()->sysname,
605 		utsname()->nodename,
606 		utsname()->release,
607 		utsname()->version,
608 		utsname()->machine,
609 		"alpha",	/* instruction set architecture */
610 		"dummy",	/* hardware serial number */
611 		"dummy",	/* hardware manufacturer */
612 		"dummy",	/* secure RPC domain */
613 	};
614 	unsigned long offset;
615 	char *res;
616 	long len, err = -EINVAL;
617 
618 	offset = command-1;
619 	if (offset >= ARRAY_SIZE(sysinfo_table)) {
620 		/* Digital UNIX has a few unpublished interfaces here */
621 		printk("sysinfo(%d)", command);
622 		goto out;
623 	}
624 
625 	down_read(&uts_sem);
626 	res = sysinfo_table[offset];
627 	len = strlen(res)+1;
628 	if (len > count)
629 		len = count;
630 	if (copy_to_user(buf, res, len))
631 		err = -EFAULT;
632 	else
633 		err = 0;
634 	up_read(&uts_sem);
635  out:
636 	return err;
637 }
638 
639 SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
640 		unsigned long, nbytes, int __user *, start, void __user *, arg)
641 {
642 	unsigned long w;
643 	struct percpu_struct *cpu;
644 
645 	switch (op) {
646 	case GSI_IEEE_FP_CONTROL:
647 		/* Return current software fp control & status bits.  */
648 		/* Note that DU doesn't verify available space here.  */
649 
650  		w = current_thread_info()->ieee_state & IEEE_SW_MASK;
651  		w = swcr_update_status(w, rdfpcr());
652 		if (put_user(w, (unsigned long __user *) buffer))
653 			return -EFAULT;
654 		return 0;
655 
656 	case GSI_IEEE_STATE_AT_SIGNAL:
657 		/*
658 		 * Not sure anybody will ever use this weird stuff.  These
659 		 * ops can be used (under OSF/1) to set the fpcr that should
660 		 * be used when a signal handler starts executing.
661 		 */
662 		break;
663 
664  	case GSI_UACPROC:
665 		if (nbytes < sizeof(unsigned int))
666 			return -EINVAL;
667  		w = (current_thread_info()->flags >> UAC_SHIFT) & UAC_BITMASK;
668  		if (put_user(w, (unsigned int __user *)buffer))
669  			return -EFAULT;
670  		return 1;
671 
672 	case GSI_PROC_TYPE:
673 		if (nbytes < sizeof(unsigned long))
674 			return -EINVAL;
675 		cpu = (struct percpu_struct*)
676 		  ((char*)hwrpb + hwrpb->processor_offset);
677 		w = cpu->type;
678 		if (put_user(w, (unsigned long  __user*)buffer))
679 			return -EFAULT;
680 		return 1;
681 
682 	case GSI_GET_HWRPB:
683 		if (nbytes < sizeof(*hwrpb))
684 			return -EINVAL;
685 		if (copy_to_user(buffer, hwrpb, nbytes) != 0)
686 			return -EFAULT;
687 		return 1;
688 
689 	default:
690 		break;
691 	}
692 
693 	return -EOPNOTSUPP;
694 }
695 
696 SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
697 		unsigned long, nbytes, int __user *, start, void __user *, arg)
698 {
699 	switch (op) {
700 	case SSI_IEEE_FP_CONTROL: {
701 		unsigned long swcr, fpcr;
702 		unsigned int *state;
703 
704 		/*
705 		 * Alpha Architecture Handbook 4.7.7.3:
706 		 * To be fully IEEE compiant, we must track the current IEEE
707 		 * exception state in software, because spurious bits can be
708 		 * set in the trap shadow of a software-complete insn.
709 		 */
710 
711 		if (get_user(swcr, (unsigned long __user *)buffer))
712 			return -EFAULT;
713 		state = &current_thread_info()->ieee_state;
714 
715 		/* Update softare trap enable bits.  */
716 		*state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);
717 
718 		/* Update the real fpcr.  */
719 		fpcr = rdfpcr() & FPCR_DYN_MASK;
720 		fpcr |= ieee_swcr_to_fpcr(swcr);
721 		wrfpcr(fpcr);
722 
723 		return 0;
724 	}
725 
726 	case SSI_IEEE_RAISE_EXCEPTION: {
727 		unsigned long exc, swcr, fpcr, fex;
728 		unsigned int *state;
729 
730 		if (get_user(exc, (unsigned long __user *)buffer))
731 			return -EFAULT;
732 		state = &current_thread_info()->ieee_state;
733 		exc &= IEEE_STATUS_MASK;
734 
735 		/* Update softare trap enable bits.  */
736  		swcr = (*state & IEEE_SW_MASK) | exc;
737 		*state |= exc;
738 
739 		/* Update the real fpcr.  */
740 		fpcr = rdfpcr();
741 		fpcr |= ieee_swcr_to_fpcr(swcr);
742 		wrfpcr(fpcr);
743 
744  		/* If any exceptions set by this call, and are unmasked,
745 		   send a signal.  Old exceptions are not signaled.  */
746 		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
747  		if (fex) {
748 			siginfo_t info;
749 			int si_code = 0;
750 
751 			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
752 			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
753 			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
754 			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
755 			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
756 			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
757 
758 			info.si_signo = SIGFPE;
759 			info.si_errno = 0;
760 			info.si_code = si_code;
761 			info.si_addr = NULL;  /* FIXME */
762  			send_sig_info(SIGFPE, &info, current);
763  		}
764 		return 0;
765 	}
766 
767 	case SSI_IEEE_STATE_AT_SIGNAL:
768 	case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
769 		/*
770 		 * Not sure anybody will ever use this weird stuff.  These
771 		 * ops can be used (under OSF/1) to set the fpcr that should
772 		 * be used when a signal handler starts executing.
773 		 */
774 		break;
775 
776  	case SSI_NVPAIRS: {
777 		unsigned long v, w, i;
778 		unsigned int old, new;
779 
780  		for (i = 0; i < nbytes; ++i) {
781 
782  			if (get_user(v, 2*i + (unsigned int __user *)buffer))
783  				return -EFAULT;
784  			if (get_user(w, 2*i + 1 + (unsigned int __user *)buffer))
785  				return -EFAULT;
786  			switch (v) {
787  			case SSIN_UACPROC:
788 			again:
789 				old = current_thread_info()->flags;
790 				new = old & ~(UAC_BITMASK << UAC_SHIFT);
791 				new = new | (w & UAC_BITMASK) << UAC_SHIFT;
792 				if (cmpxchg(&current_thread_info()->flags,
793 					    old, new) != old)
794 					goto again;
795  				break;
796 
797  			default:
798  				return -EOPNOTSUPP;
799  			}
800  		}
801  		return 0;
802 	}
803 
804 	default:
805 		break;
806 	}
807 
808 	return -EOPNOTSUPP;
809 }
810 
811 /* Translations due to the fact that OSF's time_t is an int.  Which
812    affects all sorts of things, like timeval and itimerval.  */
813 
814 extern struct timezone sys_tz;
815 
816 struct timeval32
817 {
818     int tv_sec, tv_usec;
819 };
820 
821 struct itimerval32
822 {
823     struct timeval32 it_interval;
824     struct timeval32 it_value;
825 };
826 
827 static inline long
828 get_tv32(struct timeval *o, struct timeval32 __user *i)
829 {
830 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
831 		(__get_user(o->tv_sec, &i->tv_sec) |
832 		 __get_user(o->tv_usec, &i->tv_usec)));
833 }
834 
835 static inline long
836 put_tv32(struct timeval32 __user *o, struct timeval *i)
837 {
838 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
839 		(__put_user(i->tv_sec, &o->tv_sec) |
840 		 __put_user(i->tv_usec, &o->tv_usec)));
841 }
842 
843 static inline long
844 get_it32(struct itimerval *o, struct itimerval32 __user *i)
845 {
846 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
847 		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
848 		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
849 		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
850 		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
851 }
852 
853 static inline long
854 put_it32(struct itimerval32 __user *o, struct itimerval *i)
855 {
856 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
857 		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
858 		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
859 		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
860 		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
861 }
862 
863 static inline void
864 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
865 {
866 	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
867 	value->tv_sec = jiffies / HZ;
868 }
869 
870 SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv,
871 		struct timezone __user *, tz)
872 {
873 	if (tv) {
874 		struct timeval ktv;
875 		do_gettimeofday(&ktv);
876 		if (put_tv32(tv, &ktv))
877 			return -EFAULT;
878 	}
879 	if (tz) {
880 		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
881 			return -EFAULT;
882 	}
883 	return 0;
884 }
885 
886 SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv,
887 		struct timezone __user *, tz)
888 {
889 	struct timespec kts;
890 	struct timezone ktz;
891 
892  	if (tv) {
893 		if (get_tv32((struct timeval *)&kts, tv))
894 			return -EFAULT;
895 	}
896 	if (tz) {
897 		if (copy_from_user(&ktz, tz, sizeof(*tz)))
898 			return -EFAULT;
899 	}
900 
901 	kts.tv_nsec *= 1000;
902 
903 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
904 }
905 
906 SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it)
907 {
908 	struct itimerval kit;
909 	int error;
910 
911 	error = do_getitimer(which, &kit);
912 	if (!error && put_it32(it, &kit))
913 		error = -EFAULT;
914 
915 	return error;
916 }
917 
918 SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in,
919 		struct itimerval32 __user *, out)
920 {
921 	struct itimerval kin, kout;
922 	int error;
923 
924 	if (in) {
925 		if (get_it32(&kin, in))
926 			return -EFAULT;
927 	} else
928 		memset(&kin, 0, sizeof(kin));
929 
930 	error = do_setitimer(which, &kin, out ? &kout : NULL);
931 	if (error || !out)
932 		return error;
933 
934 	if (put_it32(out, &kout))
935 		return -EFAULT;
936 
937 	return 0;
938 
939 }
940 
941 SYSCALL_DEFINE2(osf_utimes, char __user *, filename,
942 		struct timeval32 __user *, tvs)
943 {
944 	struct timespec tv[2];
945 
946 	if (tvs) {
947 		struct timeval ktvs[2];
948 		if (get_tv32(&ktvs[0], &tvs[0]) ||
949 		    get_tv32(&ktvs[1], &tvs[1]))
950 			return -EFAULT;
951 
952 		if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 ||
953 		    ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000)
954 			return -EINVAL;
955 
956 		tv[0].tv_sec = ktvs[0].tv_sec;
957 		tv[0].tv_nsec = 1000 * ktvs[0].tv_usec;
958 		tv[1].tv_sec = ktvs[1].tv_sec;
959 		tv[1].tv_nsec = 1000 * ktvs[1].tv_usec;
960 	}
961 
962 	return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0);
963 }
964 
965 #define MAX_SELECT_SECONDS \
966 	((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
967 
968 SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp,
969 		fd_set __user *, exp, struct timeval32 __user *, tvp)
970 {
971 	struct timespec end_time, *to = NULL;
972 	if (tvp) {
973 		time_t sec, usec;
974 
975 		to = &end_time;
976 
977 		if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
978 		    || __get_user(sec, &tvp->tv_sec)
979 		    || __get_user(usec, &tvp->tv_usec)) {
980 		    	return -EFAULT;
981 		}
982 
983 		if (sec < 0 || usec < 0)
984 			return -EINVAL;
985 
986 		if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC))
987 			return -EINVAL;
988 
989 	}
990 
991 	/* OSF does not copy back the remaining time.  */
992 	return core_sys_select(n, inp, outp, exp, to);
993 }
994 
995 struct rusage32 {
996 	struct timeval32 ru_utime;	/* user time used */
997 	struct timeval32 ru_stime;	/* system time used */
998 	long	ru_maxrss;		/* maximum resident set size */
999 	long	ru_ixrss;		/* integral shared memory size */
1000 	long	ru_idrss;		/* integral unshared data size */
1001 	long	ru_isrss;		/* integral unshared stack size */
1002 	long	ru_minflt;		/* page reclaims */
1003 	long	ru_majflt;		/* page faults */
1004 	long	ru_nswap;		/* swaps */
1005 	long	ru_inblock;		/* block input operations */
1006 	long	ru_oublock;		/* block output operations */
1007 	long	ru_msgsnd;		/* messages sent */
1008 	long	ru_msgrcv;		/* messages received */
1009 	long	ru_nsignals;		/* signals received */
1010 	long	ru_nvcsw;		/* voluntary context switches */
1011 	long	ru_nivcsw;		/* involuntary " */
1012 };
1013 
1014 SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru)
1015 {
1016 	struct rusage32 r;
1017 
1018 	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
1019 		return -EINVAL;
1020 
1021 	memset(&r, 0, sizeof(r));
1022 	switch (who) {
1023 	case RUSAGE_SELF:
1024 		jiffies_to_timeval32(current->utime, &r.ru_utime);
1025 		jiffies_to_timeval32(current->stime, &r.ru_stime);
1026 		r.ru_minflt = current->min_flt;
1027 		r.ru_majflt = current->maj_flt;
1028 		break;
1029 	case RUSAGE_CHILDREN:
1030 		jiffies_to_timeval32(current->signal->cutime, &r.ru_utime);
1031 		jiffies_to_timeval32(current->signal->cstime, &r.ru_stime);
1032 		r.ru_minflt = current->signal->cmin_flt;
1033 		r.ru_majflt = current->signal->cmaj_flt;
1034 		break;
1035 	}
1036 
1037 	return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1038 }
1039 
1040 SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
1041 		struct rusage32 __user *, ur)
1042 {
1043 	struct rusage r;
1044 	long ret, err;
1045 	mm_segment_t old_fs;
1046 
1047 	if (!ur)
1048 		return sys_wait4(pid, ustatus, options, NULL);
1049 
1050 	old_fs = get_fs();
1051 
1052 	set_fs (KERNEL_DS);
1053 	ret = sys_wait4(pid, ustatus, options, (struct rusage __user *) &r);
1054 	set_fs (old_fs);
1055 
1056 	if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
1057 		return -EFAULT;
1058 
1059 	err = 0;
1060 	err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
1061 	err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
1062 	err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
1063 	err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
1064 	err |= __put_user(r.ru_maxrss, &ur->ru_maxrss);
1065 	err |= __put_user(r.ru_ixrss, &ur->ru_ixrss);
1066 	err |= __put_user(r.ru_idrss, &ur->ru_idrss);
1067 	err |= __put_user(r.ru_isrss, &ur->ru_isrss);
1068 	err |= __put_user(r.ru_minflt, &ur->ru_minflt);
1069 	err |= __put_user(r.ru_majflt, &ur->ru_majflt);
1070 	err |= __put_user(r.ru_nswap, &ur->ru_nswap);
1071 	err |= __put_user(r.ru_inblock, &ur->ru_inblock);
1072 	err |= __put_user(r.ru_oublock, &ur->ru_oublock);
1073 	err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
1074 	err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
1075 	err |= __put_user(r.ru_nsignals, &ur->ru_nsignals);
1076 	err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
1077 	err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw);
1078 
1079 	return err ? err : ret;
1080 }
1081 
1082 /*
1083  * I don't know what the parameters are: the first one
1084  * seems to be a timeval pointer, and I suspect the second
1085  * one is the time remaining.. Ho humm.. No documentation.
1086  */
1087 SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep,
1088 		struct timeval32 __user *, remain)
1089 {
1090 	struct timeval tmp;
1091 	unsigned long ticks;
1092 
1093 	if (get_tv32(&tmp, sleep))
1094 		goto fault;
1095 
1096 	ticks = timeval_to_jiffies(&tmp);
1097 
1098 	ticks = schedule_timeout_interruptible(ticks);
1099 
1100 	if (remain) {
1101 		jiffies_to_timeval(ticks, &tmp);
1102 		if (put_tv32(remain, &tmp))
1103 			goto fault;
1104 	}
1105 
1106 	return 0;
1107  fault:
1108 	return -EFAULT;
1109 }
1110 
1111 
1112 struct timex32 {
1113 	unsigned int modes;	/* mode selector */
1114 	long offset;		/* time offset (usec) */
1115 	long freq;		/* frequency offset (scaled ppm) */
1116 	long maxerror;		/* maximum error (usec) */
1117 	long esterror;		/* estimated error (usec) */
1118 	int status;		/* clock command/status */
1119 	long constant;		/* pll time constant */
1120 	long precision;		/* clock precision (usec) (read only) */
1121 	long tolerance;		/* clock frequency tolerance (ppm)
1122 				 * (read only)
1123 				 */
1124 	struct timeval32 time;	/* (read only) */
1125 	long tick;		/* (modified) usecs between clock ticks */
1126 
1127 	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
1128 	long jitter;            /* pps jitter (us) (ro) */
1129 	int shift;              /* interval duration (s) (shift) (ro) */
1130 	long stabil;            /* pps stability (scaled ppm) (ro) */
1131 	long jitcnt;            /* jitter limit exceeded (ro) */
1132 	long calcnt;            /* calibration intervals (ro) */
1133 	long errcnt;            /* calibration errors (ro) */
1134 	long stbcnt;            /* stability limit exceeded (ro) */
1135 
1136 	int  :32; int  :32; int  :32; int  :32;
1137 	int  :32; int  :32; int  :32; int  :32;
1138 	int  :32; int  :32; int  :32; int  :32;
1139 };
1140 
1141 SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p)
1142 {
1143         struct timex txc;
1144 	int ret;
1145 
1146 	/* copy relevant bits of struct timex. */
1147 	if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
1148 	    copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) -
1149 			   offsetof(struct timex32, time)))
1150 	  return -EFAULT;
1151 
1152 	ret = do_adjtimex(&txc);
1153 	if (ret < 0)
1154 	  return ret;
1155 
1156 	/* copy back to timex32 */
1157 	if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
1158 	    (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) -
1159 			  offsetof(struct timex32, tick))) ||
1160 	    (put_tv32(&txc_p->time, &txc.time)))
1161 	  return -EFAULT;
1162 
1163 	return ret;
1164 }
1165 
1166 /* Get an address range which is currently unmapped.  Similar to the
1167    generic version except that we know how to honor ADDR_LIMIT_32BIT.  */
1168 
1169 static unsigned long
1170 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
1171 		         unsigned long limit)
1172 {
1173 	struct vm_area_struct *vma = find_vma(current->mm, addr);
1174 
1175 	while (1) {
1176 		/* At this point:  (!vma || addr < vma->vm_end). */
1177 		if (limit - len < addr)
1178 			return -ENOMEM;
1179 		if (!vma || addr + len <= vma->vm_start)
1180 			return addr;
1181 		addr = vma->vm_end;
1182 		vma = vma->vm_next;
1183 	}
1184 }
1185 
1186 unsigned long
1187 arch_get_unmapped_area(struct file *filp, unsigned long addr,
1188 		       unsigned long len, unsigned long pgoff,
1189 		       unsigned long flags)
1190 {
1191 	unsigned long limit;
1192 
1193 	/* "32 bit" actually means 31 bit, since pointers sign extend.  */
1194 	if (current->personality & ADDR_LIMIT_32BIT)
1195 		limit = 0x80000000;
1196 	else
1197 		limit = TASK_SIZE;
1198 
1199 	if (len > limit)
1200 		return -ENOMEM;
1201 
1202 	if (flags & MAP_FIXED)
1203 		return addr;
1204 
1205 	/* First, see if the given suggestion fits.
1206 
1207 	   The OSF/1 loader (/sbin/loader) relies on us returning an
1208 	   address larger than the requested if one exists, which is
1209 	   a terribly broken way to program.
1210 
1211 	   That said, I can see the use in being able to suggest not
1212 	   merely specific addresses, but regions of memory -- perhaps
1213 	   this feature should be incorporated into all ports?  */
1214 
1215 	if (addr) {
1216 		addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
1217 		if (addr != (unsigned long) -ENOMEM)
1218 			return addr;
1219 	}
1220 
1221 	/* Next, try allocating at TASK_UNMAPPED_BASE.  */
1222 	addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
1223 					 len, limit);
1224 	if (addr != (unsigned long) -ENOMEM)
1225 		return addr;
1226 
1227 	/* Finally, try allocating in low memory.  */
1228 	addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);
1229 
1230 	return addr;
1231 }
1232 
1233 #ifdef CONFIG_OSF4_COMPAT
1234 
1235 /* Clear top 32 bits of iov_len in the user's buffer for
1236    compatibility with old versions of OSF/1 where iov_len
1237    was defined as int. */
1238 static int
1239 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
1240 {
1241 	unsigned long i;
1242 
1243 	for (i = 0 ; i < count ; i++) {
1244 		int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;
1245 
1246 		if (put_user(0, iov_len_high))
1247 			return -EFAULT;
1248 	}
1249 	return 0;
1250 }
1251 
1252 SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
1253 		const struct iovec __user *, vector, unsigned long, count)
1254 {
1255 	if (unlikely(personality(current->personality) == PER_OSF4))
1256 		if (osf_fix_iov_len(vector, count))
1257 			return -EFAULT;
1258 	return sys_readv(fd, vector, count);
1259 }
1260 
1261 SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
1262 		const struct iovec __user *, vector, unsigned long, count)
1263 {
1264 	if (unlikely(personality(current->personality) == PER_OSF4))
1265 		if (osf_fix_iov_len(vector, count))
1266 			return -EFAULT;
1267 	return sys_writev(fd, vector, count);
1268 }
1269 
1270 #endif
1271