xref: /openbmc/linux/arch/alpha/kernel/osf_sys.c (revision 9c1f8594)
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/stddef.h>
19 #include <linux/syscalls.h>
20 #include <linux/unistd.h>
21 #include <linux/ptrace.h>
22 #include <linux/user.h>
23 #include <linux/utsname.h>
24 #include <linux/time.h>
25 #include <linux/timex.h>
26 #include <linux/major.h>
27 #include <linux/stat.h>
28 #include <linux/mman.h>
29 #include <linux/shm.h>
30 #include <linux/poll.h>
31 #include <linux/file.h>
32 #include <linux/types.h>
33 #include <linux/ipc.h>
34 #include <linux/namei.h>
35 #include <linux/uio.h>
36 #include <linux/vfs.h>
37 #include <linux/rcupdate.h>
38 #include <linux/slab.h>
39 
40 #include <asm/fpu.h>
41 #include <asm/io.h>
42 #include <asm/uaccess.h>
43 #include <asm/system.h>
44 #include <asm/sysinfo.h>
45 #include <asm/thread_info.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 	mm = current->mm;
73 	mm->end_code = bss_start + bss_len;
74 	mm->start_brk = bss_start + bss_len;
75 	mm->brk = bss_start + bss_len;
76 #if 0
77 	printk("set_program_attributes(%lx %lx %lx %lx)\n",
78 		text_start, text_len, bss_start, bss_len);
79 #endif
80 	return 0;
81 }
82 
83 /*
84  * OSF/1 directory handling functions...
85  *
86  * The "getdents()" interface is much more sane: the "basep" stuff is
87  * braindamage (it can't really handle filesystems where the directory
88  * offset differences aren't the same as "d_reclen").
89  */
90 #define NAME_OFFSET	offsetof (struct osf_dirent, d_name)
91 
92 struct osf_dirent {
93 	unsigned int d_ino;
94 	unsigned short d_reclen;
95 	unsigned short d_namlen;
96 	char d_name[1];
97 };
98 
99 struct osf_dirent_callback {
100 	struct osf_dirent __user *dirent;
101 	long __user *basep;
102 	unsigned int count;
103 	int error;
104 };
105 
106 static int
107 osf_filldir(void *__buf, const char *name, int namlen, loff_t offset,
108 	    u64 ino, unsigned int d_type)
109 {
110 	struct osf_dirent __user *dirent;
111 	struct osf_dirent_callback *buf = (struct osf_dirent_callback *) __buf;
112 	unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32));
113 	unsigned int d_ino;
114 
115 	buf->error = -EINVAL;	/* only used if we fail */
116 	if (reclen > buf->count)
117 		return -EINVAL;
118 	d_ino = ino;
119 	if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
120 		buf->error = -EOVERFLOW;
121 		return -EOVERFLOW;
122 	}
123 	if (buf->basep) {
124 		if (put_user(offset, buf->basep))
125 			goto Efault;
126 		buf->basep = NULL;
127 	}
128 	dirent = buf->dirent;
129 	if (put_user(d_ino, &dirent->d_ino) ||
130 	    put_user(namlen, &dirent->d_namlen) ||
131 	    put_user(reclen, &dirent->d_reclen) ||
132 	    copy_to_user(dirent->d_name, name, namlen) ||
133 	    put_user(0, dirent->d_name + namlen))
134 		goto Efault;
135 	dirent = (void __user *)dirent + reclen;
136 	buf->dirent = dirent;
137 	buf->count -= reclen;
138 	return 0;
139 Efault:
140 	buf->error = -EFAULT;
141 	return -EFAULT;
142 }
143 
144 SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
145 		struct osf_dirent __user *, dirent, unsigned int, count,
146 		long __user *, basep)
147 {
148 	int error;
149 	struct file *file;
150 	struct osf_dirent_callback buf;
151 
152 	error = -EBADF;
153 	file = fget(fd);
154 	if (!file)
155 		goto out;
156 
157 	buf.dirent = dirent;
158 	buf.basep = basep;
159 	buf.count = count;
160 	buf.error = 0;
161 
162 	error = vfs_readdir(file, osf_filldir, &buf);
163 	if (error >= 0)
164 		error = buf.error;
165 	if (count != buf.count)
166 		error = count - buf.count;
167 
168 	fput(file);
169  out:
170 	return error;
171 }
172 
173 #undef NAME_OFFSET
174 
175 SYSCALL_DEFINE6(osf_mmap, unsigned long, addr, unsigned long, len,
176 		unsigned long, prot, unsigned long, flags, unsigned long, fd,
177 		unsigned long, off)
178 {
179 	unsigned long ret = -EINVAL;
180 
181 #if 0
182 	if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
183 		printk("%s: unimplemented OSF mmap flags %04lx\n",
184 			current->comm, flags);
185 #endif
186 	if ((off + PAGE_ALIGN(len)) < off)
187 		goto out;
188 	if (off & ~PAGE_MASK)
189 		goto out;
190 	ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
191  out:
192 	return ret;
193 }
194 
195 
196 /*
197  * The OSF/1 statfs structure is much larger, but this should
198  * match the beginning, at least.
199  */
200 struct osf_statfs {
201 	short f_type;
202 	short f_flags;
203 	int f_fsize;
204 	int f_bsize;
205 	int f_blocks;
206 	int f_bfree;
207 	int f_bavail;
208 	int f_files;
209 	int f_ffree;
210 	__kernel_fsid_t f_fsid;
211 };
212 
213 static int
214 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat,
215 		    unsigned long bufsiz)
216 {
217 	struct osf_statfs tmp_stat;
218 
219 	tmp_stat.f_type = linux_stat->f_type;
220 	tmp_stat.f_flags = 0;	/* mount flags */
221 	tmp_stat.f_fsize = linux_stat->f_frsize;
222 	tmp_stat.f_bsize = linux_stat->f_bsize;
223 	tmp_stat.f_blocks = linux_stat->f_blocks;
224 	tmp_stat.f_bfree = linux_stat->f_bfree;
225 	tmp_stat.f_bavail = linux_stat->f_bavail;
226 	tmp_stat.f_files = linux_stat->f_files;
227 	tmp_stat.f_ffree = linux_stat->f_ffree;
228 	tmp_stat.f_fsid = linux_stat->f_fsid;
229 	if (bufsiz > sizeof(tmp_stat))
230 		bufsiz = sizeof(tmp_stat);
231 	return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
232 }
233 
234 SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
235 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
236 {
237 	struct kstatfs linux_stat;
238 	int error = user_statfs(pathname, &linux_stat);
239 	if (!error)
240 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
241 	return error;
242 }
243 
244 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd,
245 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
246 {
247 	struct kstatfs linux_stat;
248 	int error = fd_statfs(fd, &linux_stat);
249 	if (!error)
250 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
251 	return error;
252 }
253 
254 /*
255  * Uhh.. OSF/1 mount parameters aren't exactly obvious..
256  *
257  * Although to be frank, neither are the native Linux/i386 ones..
258  */
259 struct ufs_args {
260 	char __user *devname;
261 	int flags;
262 	uid_t exroot;
263 };
264 
265 struct cdfs_args {
266 	char __user *devname;
267 	int flags;
268 	uid_t exroot;
269 
270 	/* This has lots more here, which Linux handles with the option block
271 	   but I'm too lazy to do the translation into ASCII.  */
272 };
273 
274 struct procfs_args {
275 	char __user *devname;
276 	int flags;
277 	uid_t exroot;
278 };
279 
280 /*
281  * We can't actually handle ufs yet, so we translate UFS mounts to
282  * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
283  * layout is so braindead it's a major headache doing it.
284  *
285  * Just how long ago was it written? OTOH our UFS driver may be still
286  * unhappy with OSF UFS. [CHECKME]
287  */
288 static int
289 osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
290 {
291 	int retval;
292 	struct cdfs_args tmp;
293 	char *devname;
294 
295 	retval = -EFAULT;
296 	if (copy_from_user(&tmp, args, sizeof(tmp)))
297 		goto out;
298 	devname = getname(tmp.devname);
299 	retval = PTR_ERR(devname);
300 	if (IS_ERR(devname))
301 		goto out;
302 	retval = do_mount(devname, dirname, "ext2", flags, NULL);
303 	putname(devname);
304  out:
305 	return retval;
306 }
307 
308 static int
309 osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
310 {
311 	int retval;
312 	struct cdfs_args tmp;
313 	char *devname;
314 
315 	retval = -EFAULT;
316 	if (copy_from_user(&tmp, args, sizeof(tmp)))
317 		goto out;
318 	devname = getname(tmp.devname);
319 	retval = PTR_ERR(devname);
320 	if (IS_ERR(devname))
321 		goto out;
322 	retval = do_mount(devname, dirname, "iso9660", flags, NULL);
323 	putname(devname);
324  out:
325 	return retval;
326 }
327 
328 static int
329 osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
330 {
331 	struct procfs_args tmp;
332 
333 	if (copy_from_user(&tmp, args, sizeof(tmp)))
334 		return -EFAULT;
335 
336 	return do_mount("", dirname, "proc", flags, NULL);
337 }
338 
339 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
340 		int, flag, void __user *, data)
341 {
342 	int retval;
343 	char *name;
344 
345 	name = getname(path);
346 	retval = PTR_ERR(name);
347 	if (IS_ERR(name))
348 		goto out;
349 	switch (typenr) {
350 	case 1:
351 		retval = osf_ufs_mount(name, data, flag);
352 		break;
353 	case 6:
354 		retval = osf_cdfs_mount(name, data, flag);
355 		break;
356 	case 9:
357 		retval = osf_procfs_mount(name, data, flag);
358 		break;
359 	default:
360 		retval = -EINVAL;
361 		printk("osf_mount(%ld, %x)\n", typenr, flag);
362 	}
363 	putname(name);
364  out:
365 	return retval;
366 }
367 
368 SYSCALL_DEFINE1(osf_utsname, char __user *, name)
369 {
370 	int error;
371 
372 	down_read(&uts_sem);
373 	error = -EFAULT;
374 	if (copy_to_user(name + 0, utsname()->sysname, 32))
375 		goto out;
376 	if (copy_to_user(name + 32, utsname()->nodename, 32))
377 		goto out;
378 	if (copy_to_user(name + 64, utsname()->release, 32))
379 		goto out;
380 	if (copy_to_user(name + 96, utsname()->version, 32))
381 		goto out;
382 	if (copy_to_user(name + 128, utsname()->machine, 32))
383 		goto out;
384 
385 	error = 0;
386  out:
387 	up_read(&uts_sem);
388 	return error;
389 }
390 
391 SYSCALL_DEFINE0(getpagesize)
392 {
393 	return PAGE_SIZE;
394 }
395 
396 SYSCALL_DEFINE0(getdtablesize)
397 {
398 	return sysctl_nr_open;
399 }
400 
401 /*
402  * For compatibility with OSF/1 only.  Use utsname(2) instead.
403  */
404 SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
405 {
406 	unsigned len;
407 	int i;
408 
409 	if (!access_ok(VERIFY_WRITE, name, namelen))
410 		return -EFAULT;
411 
412 	len = namelen;
413 	if (len > 32)
414 		len = 32;
415 
416 	down_read(&uts_sem);
417 	for (i = 0; i < len; ++i) {
418 		__put_user(utsname()->domainname[i], name + i);
419 		if (utsname()->domainname[i] == '\0')
420 			break;
421 	}
422 	up_read(&uts_sem);
423 
424 	return 0;
425 }
426 
427 /*
428  * The following stuff should move into a header file should it ever
429  * be labeled "officially supported."  Right now, there is just enough
430  * support to avoid applications (such as tar) printing error
431  * messages.  The attributes are not really implemented.
432  */
433 
434 /*
435  * Values for Property list entry flag
436  */
437 #define PLE_PROPAGATE_ON_COPY		0x1	/* cp(1) will copy entry
438 						   by default */
439 #define PLE_FLAG_MASK			0x1	/* Valid flag values */
440 #define PLE_FLAG_ALL			-1	/* All flag value */
441 
442 struct proplistname_args {
443 	unsigned int pl_mask;
444 	unsigned int pl_numnames;
445 	char **pl_names;
446 };
447 
448 union pl_args {
449 	struct setargs {
450 		char __user *path;
451 		long follow;
452 		long nbytes;
453 		char __user *buf;
454 	} set;
455 	struct fsetargs {
456 		long fd;
457 		long nbytes;
458 		char __user *buf;
459 	} fset;
460 	struct getargs {
461 		char __user *path;
462 		long follow;
463 		struct proplistname_args __user *name_args;
464 		long nbytes;
465 		char __user *buf;
466 		int __user *min_buf_size;
467 	} get;
468 	struct fgetargs {
469 		long fd;
470 		struct proplistname_args __user *name_args;
471 		long nbytes;
472 		char __user *buf;
473 		int __user *min_buf_size;
474 	} fget;
475 	struct delargs {
476 		char __user *path;
477 		long follow;
478 		struct proplistname_args __user *name_args;
479 	} del;
480 	struct fdelargs {
481 		long fd;
482 		struct proplistname_args __user *name_args;
483 	} fdel;
484 };
485 
486 enum pl_code {
487 	PL_SET = 1, PL_FSET = 2,
488 	PL_GET = 3, PL_FGET = 4,
489 	PL_DEL = 5, PL_FDEL = 6
490 };
491 
492 SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code,
493 		union pl_args __user *, args)
494 {
495 	long error;
496 	int __user *min_buf_size_ptr;
497 
498 	switch (code) {
499 	case PL_SET:
500 		if (get_user(error, &args->set.nbytes))
501 			error = -EFAULT;
502 		break;
503 	case PL_FSET:
504 		if (get_user(error, &args->fset.nbytes))
505 			error = -EFAULT;
506 		break;
507 	case PL_GET:
508 		error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
509 		if (error)
510 			break;
511 		error = put_user(0, min_buf_size_ptr);
512 		break;
513 	case PL_FGET:
514 		error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
515 		if (error)
516 			break;
517 		error = put_user(0, min_buf_size_ptr);
518 		break;
519 	case PL_DEL:
520 	case PL_FDEL:
521 		error = 0;
522 		break;
523 	default:
524 		error = -EOPNOTSUPP;
525 		break;
526 	};
527 	return error;
528 }
529 
530 SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss,
531 		struct sigstack __user *, uoss)
532 {
533 	unsigned long usp = rdusp();
534 	unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
535 	unsigned long oss_os = on_sig_stack(usp);
536 	int error;
537 
538 	if (uss) {
539 		void __user *ss_sp;
540 
541 		error = -EFAULT;
542 		if (get_user(ss_sp, &uss->ss_sp))
543 			goto out;
544 
545 		/* If the current stack was set with sigaltstack, don't
546 		   swap stacks while we are on it.  */
547 		error = -EPERM;
548 		if (current->sas_ss_sp && on_sig_stack(usp))
549 			goto out;
550 
551 		/* Since we don't know the extent of the stack, and we don't
552 		   track onstack-ness, but rather calculate it, we must
553 		   presume a size.  Ho hum this interface is lossy.  */
554 		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
555 		current->sas_ss_size = SIGSTKSZ;
556 	}
557 
558 	if (uoss) {
559 		error = -EFAULT;
560 		if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
561 		    || __put_user(oss_sp, &uoss->ss_sp)
562 		    || __put_user(oss_os, &uoss->ss_onstack))
563 			goto out;
564 	}
565 
566 	error = 0;
567  out:
568 	return error;
569 }
570 
571 SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
572 {
573 	const char *sysinfo_table[] = {
574 		utsname()->sysname,
575 		utsname()->nodename,
576 		utsname()->release,
577 		utsname()->version,
578 		utsname()->machine,
579 		"alpha",	/* instruction set architecture */
580 		"dummy",	/* hardware serial number */
581 		"dummy",	/* hardware manufacturer */
582 		"dummy",	/* secure RPC domain */
583 	};
584 	unsigned long offset;
585 	const char *res;
586 	long len, err = -EINVAL;
587 
588 	offset = command-1;
589 	if (offset >= ARRAY_SIZE(sysinfo_table)) {
590 		/* Digital UNIX has a few unpublished interfaces here */
591 		printk("sysinfo(%d)", command);
592 		goto out;
593 	}
594 
595 	down_read(&uts_sem);
596 	res = sysinfo_table[offset];
597 	len = strlen(res)+1;
598 	if ((unsigned long)len > (unsigned long)count)
599 		len = count;
600 	if (copy_to_user(buf, res, len))
601 		err = -EFAULT;
602 	else
603 		err = 0;
604 	up_read(&uts_sem);
605  out:
606 	return err;
607 }
608 
609 SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
610 		unsigned long, nbytes, int __user *, start, void __user *, arg)
611 {
612 	unsigned long w;
613 	struct percpu_struct *cpu;
614 
615 	switch (op) {
616 	case GSI_IEEE_FP_CONTROL:
617 		/* Return current software fp control & status bits.  */
618 		/* Note that DU doesn't verify available space here.  */
619 
620  		w = current_thread_info()->ieee_state & IEEE_SW_MASK;
621  		w = swcr_update_status(w, rdfpcr());
622 		if (put_user(w, (unsigned long __user *) buffer))
623 			return -EFAULT;
624 		return 0;
625 
626 	case GSI_IEEE_STATE_AT_SIGNAL:
627 		/*
628 		 * Not sure anybody will ever use this weird stuff.  These
629 		 * ops can be used (under OSF/1) to set the fpcr that should
630 		 * be used when a signal handler starts executing.
631 		 */
632 		break;
633 
634  	case GSI_UACPROC:
635 		if (nbytes < sizeof(unsigned int))
636 			return -EINVAL;
637 		w = (current_thread_info()->flags >> ALPHA_UAC_SHIFT) &
638 			UAC_BITMASK;
639 		if (put_user(w, (unsigned int __user *)buffer))
640 			return -EFAULT;
641  		return 1;
642 
643 	case GSI_PROC_TYPE:
644 		if (nbytes < sizeof(unsigned long))
645 			return -EINVAL;
646 		cpu = (struct percpu_struct*)
647 		  ((char*)hwrpb + hwrpb->processor_offset);
648 		w = cpu->type;
649 		if (put_user(w, (unsigned long  __user*)buffer))
650 			return -EFAULT;
651 		return 1;
652 
653 	case GSI_GET_HWRPB:
654 		if (nbytes > sizeof(*hwrpb))
655 			return -EINVAL;
656 		if (copy_to_user(buffer, hwrpb, nbytes) != 0)
657 			return -EFAULT;
658 		return 1;
659 
660 	default:
661 		break;
662 	}
663 
664 	return -EOPNOTSUPP;
665 }
666 
667 SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
668 		unsigned long, nbytes, int __user *, start, void __user *, arg)
669 {
670 	switch (op) {
671 	case SSI_IEEE_FP_CONTROL: {
672 		unsigned long swcr, fpcr;
673 		unsigned int *state;
674 
675 		/*
676 		 * Alpha Architecture Handbook 4.7.7.3:
677 		 * To be fully IEEE compiant, we must track the current IEEE
678 		 * exception state in software, because spurious bits can be
679 		 * set in the trap shadow of a software-complete insn.
680 		 */
681 
682 		if (get_user(swcr, (unsigned long __user *)buffer))
683 			return -EFAULT;
684 		state = &current_thread_info()->ieee_state;
685 
686 		/* Update softare trap enable bits.  */
687 		*state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);
688 
689 		/* Update the real fpcr.  */
690 		fpcr = rdfpcr() & FPCR_DYN_MASK;
691 		fpcr |= ieee_swcr_to_fpcr(swcr);
692 		wrfpcr(fpcr);
693 
694 		return 0;
695 	}
696 
697 	case SSI_IEEE_RAISE_EXCEPTION: {
698 		unsigned long exc, swcr, fpcr, fex;
699 		unsigned int *state;
700 
701 		if (get_user(exc, (unsigned long __user *)buffer))
702 			return -EFAULT;
703 		state = &current_thread_info()->ieee_state;
704 		exc &= IEEE_STATUS_MASK;
705 
706 		/* Update softare trap enable bits.  */
707  		swcr = (*state & IEEE_SW_MASK) | exc;
708 		*state |= exc;
709 
710 		/* Update the real fpcr.  */
711 		fpcr = rdfpcr();
712 		fpcr |= ieee_swcr_to_fpcr(swcr);
713 		wrfpcr(fpcr);
714 
715  		/* If any exceptions set by this call, and are unmasked,
716 		   send a signal.  Old exceptions are not signaled.  */
717 		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
718  		if (fex) {
719 			siginfo_t info;
720 			int si_code = 0;
721 
722 			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
723 			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
724 			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
725 			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
726 			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
727 			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
728 
729 			info.si_signo = SIGFPE;
730 			info.si_errno = 0;
731 			info.si_code = si_code;
732 			info.si_addr = NULL;  /* FIXME */
733  			send_sig_info(SIGFPE, &info, current);
734  		}
735 		return 0;
736 	}
737 
738 	case SSI_IEEE_STATE_AT_SIGNAL:
739 	case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
740 		/*
741 		 * Not sure anybody will ever use this weird stuff.  These
742 		 * ops can be used (under OSF/1) to set the fpcr that should
743 		 * be used when a signal handler starts executing.
744 		 */
745 		break;
746 
747  	case SSI_NVPAIRS: {
748 		unsigned long v, w, i;
749 		unsigned int old, new;
750 
751  		for (i = 0; i < nbytes; ++i) {
752 
753  			if (get_user(v, 2*i + (unsigned int __user *)buffer))
754  				return -EFAULT;
755  			if (get_user(w, 2*i + 1 + (unsigned int __user *)buffer))
756  				return -EFAULT;
757  			switch (v) {
758  			case SSIN_UACPROC:
759 			again:
760 				old = current_thread_info()->flags;
761 				new = old & ~(UAC_BITMASK << ALPHA_UAC_SHIFT);
762 				new = new | (w & UAC_BITMASK) << ALPHA_UAC_SHIFT;
763 				if (cmpxchg(&current_thread_info()->flags,
764 					    old, new) != old)
765 					goto again;
766  				break;
767 
768  			default:
769  				return -EOPNOTSUPP;
770  			}
771  		}
772  		return 0;
773 	}
774 
775 	default:
776 		break;
777 	}
778 
779 	return -EOPNOTSUPP;
780 }
781 
782 /* Translations due to the fact that OSF's time_t is an int.  Which
783    affects all sorts of things, like timeval and itimerval.  */
784 
785 extern struct timezone sys_tz;
786 
787 struct timeval32
788 {
789     int tv_sec, tv_usec;
790 };
791 
792 struct itimerval32
793 {
794     struct timeval32 it_interval;
795     struct timeval32 it_value;
796 };
797 
798 static inline long
799 get_tv32(struct timeval *o, struct timeval32 __user *i)
800 {
801 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
802 		(__get_user(o->tv_sec, &i->tv_sec) |
803 		 __get_user(o->tv_usec, &i->tv_usec)));
804 }
805 
806 static inline long
807 put_tv32(struct timeval32 __user *o, struct timeval *i)
808 {
809 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
810 		(__put_user(i->tv_sec, &o->tv_sec) |
811 		 __put_user(i->tv_usec, &o->tv_usec)));
812 }
813 
814 static inline long
815 get_it32(struct itimerval *o, struct itimerval32 __user *i)
816 {
817 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
818 		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
819 		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
820 		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
821 		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
822 }
823 
824 static inline long
825 put_it32(struct itimerval32 __user *o, struct itimerval *i)
826 {
827 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
828 		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
829 		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
830 		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
831 		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
832 }
833 
834 static inline void
835 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
836 {
837 	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
838 	value->tv_sec = jiffies / HZ;
839 }
840 
841 SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv,
842 		struct timezone __user *, tz)
843 {
844 	if (tv) {
845 		struct timeval ktv;
846 		do_gettimeofday(&ktv);
847 		if (put_tv32(tv, &ktv))
848 			return -EFAULT;
849 	}
850 	if (tz) {
851 		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
852 			return -EFAULT;
853 	}
854 	return 0;
855 }
856 
857 SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv,
858 		struct timezone __user *, tz)
859 {
860 	struct timespec kts;
861 	struct timezone ktz;
862 
863  	if (tv) {
864 		if (get_tv32((struct timeval *)&kts, tv))
865 			return -EFAULT;
866 	}
867 	if (tz) {
868 		if (copy_from_user(&ktz, tz, sizeof(*tz)))
869 			return -EFAULT;
870 	}
871 
872 	kts.tv_nsec *= 1000;
873 
874 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
875 }
876 
877 SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it)
878 {
879 	struct itimerval kit;
880 	int error;
881 
882 	error = do_getitimer(which, &kit);
883 	if (!error && put_it32(it, &kit))
884 		error = -EFAULT;
885 
886 	return error;
887 }
888 
889 SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in,
890 		struct itimerval32 __user *, out)
891 {
892 	struct itimerval kin, kout;
893 	int error;
894 
895 	if (in) {
896 		if (get_it32(&kin, in))
897 			return -EFAULT;
898 	} else
899 		memset(&kin, 0, sizeof(kin));
900 
901 	error = do_setitimer(which, &kin, out ? &kout : NULL);
902 	if (error || !out)
903 		return error;
904 
905 	if (put_it32(out, &kout))
906 		return -EFAULT;
907 
908 	return 0;
909 
910 }
911 
912 SYSCALL_DEFINE2(osf_utimes, const char __user *, filename,
913 		struct timeval32 __user *, tvs)
914 {
915 	struct timespec tv[2];
916 
917 	if (tvs) {
918 		struct timeval ktvs[2];
919 		if (get_tv32(&ktvs[0], &tvs[0]) ||
920 		    get_tv32(&ktvs[1], &tvs[1]))
921 			return -EFAULT;
922 
923 		if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 ||
924 		    ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000)
925 			return -EINVAL;
926 
927 		tv[0].tv_sec = ktvs[0].tv_sec;
928 		tv[0].tv_nsec = 1000 * ktvs[0].tv_usec;
929 		tv[1].tv_sec = ktvs[1].tv_sec;
930 		tv[1].tv_nsec = 1000 * ktvs[1].tv_usec;
931 	}
932 
933 	return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0);
934 }
935 
936 SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp,
937 		fd_set __user *, exp, struct timeval32 __user *, tvp)
938 {
939 	struct timespec end_time, *to = NULL;
940 	if (tvp) {
941 		time_t sec, usec;
942 
943 		to = &end_time;
944 
945 		if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
946 		    || __get_user(sec, &tvp->tv_sec)
947 		    || __get_user(usec, &tvp->tv_usec)) {
948 		    	return -EFAULT;
949 		}
950 
951 		if (sec < 0 || usec < 0)
952 			return -EINVAL;
953 
954 		if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC))
955 			return -EINVAL;
956 
957 	}
958 
959 	/* OSF does not copy back the remaining time.  */
960 	return core_sys_select(n, inp, outp, exp, to);
961 }
962 
963 struct rusage32 {
964 	struct timeval32 ru_utime;	/* user time used */
965 	struct timeval32 ru_stime;	/* system time used */
966 	long	ru_maxrss;		/* maximum resident set size */
967 	long	ru_ixrss;		/* integral shared memory size */
968 	long	ru_idrss;		/* integral unshared data size */
969 	long	ru_isrss;		/* integral unshared stack size */
970 	long	ru_minflt;		/* page reclaims */
971 	long	ru_majflt;		/* page faults */
972 	long	ru_nswap;		/* swaps */
973 	long	ru_inblock;		/* block input operations */
974 	long	ru_oublock;		/* block output operations */
975 	long	ru_msgsnd;		/* messages sent */
976 	long	ru_msgrcv;		/* messages received */
977 	long	ru_nsignals;		/* signals received */
978 	long	ru_nvcsw;		/* voluntary context switches */
979 	long	ru_nivcsw;		/* involuntary " */
980 };
981 
982 SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru)
983 {
984 	struct rusage32 r;
985 
986 	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
987 		return -EINVAL;
988 
989 	memset(&r, 0, sizeof(r));
990 	switch (who) {
991 	case RUSAGE_SELF:
992 		jiffies_to_timeval32(current->utime, &r.ru_utime);
993 		jiffies_to_timeval32(current->stime, &r.ru_stime);
994 		r.ru_minflt = current->min_flt;
995 		r.ru_majflt = current->maj_flt;
996 		break;
997 	case RUSAGE_CHILDREN:
998 		jiffies_to_timeval32(current->signal->cutime, &r.ru_utime);
999 		jiffies_to_timeval32(current->signal->cstime, &r.ru_stime);
1000 		r.ru_minflt = current->signal->cmin_flt;
1001 		r.ru_majflt = current->signal->cmaj_flt;
1002 		break;
1003 	}
1004 
1005 	return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1006 }
1007 
1008 SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
1009 		struct rusage32 __user *, ur)
1010 {
1011 	struct rusage r;
1012 	long ret, err;
1013 	unsigned int status = 0;
1014 	mm_segment_t old_fs;
1015 
1016 	if (!ur)
1017 		return sys_wait4(pid, ustatus, options, NULL);
1018 
1019 	old_fs = get_fs();
1020 
1021 	set_fs (KERNEL_DS);
1022 	ret = sys_wait4(pid, (unsigned int __user *) &status, options,
1023 			(struct rusage __user *) &r);
1024 	set_fs (old_fs);
1025 
1026 	if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
1027 		return -EFAULT;
1028 
1029 	err = 0;
1030 	err |= put_user(status, ustatus);
1031 	err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
1032 	err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
1033 	err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
1034 	err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
1035 	err |= __put_user(r.ru_maxrss, &ur->ru_maxrss);
1036 	err |= __put_user(r.ru_ixrss, &ur->ru_ixrss);
1037 	err |= __put_user(r.ru_idrss, &ur->ru_idrss);
1038 	err |= __put_user(r.ru_isrss, &ur->ru_isrss);
1039 	err |= __put_user(r.ru_minflt, &ur->ru_minflt);
1040 	err |= __put_user(r.ru_majflt, &ur->ru_majflt);
1041 	err |= __put_user(r.ru_nswap, &ur->ru_nswap);
1042 	err |= __put_user(r.ru_inblock, &ur->ru_inblock);
1043 	err |= __put_user(r.ru_oublock, &ur->ru_oublock);
1044 	err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
1045 	err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
1046 	err |= __put_user(r.ru_nsignals, &ur->ru_nsignals);
1047 	err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
1048 	err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw);
1049 
1050 	return err ? err : ret;
1051 }
1052 
1053 /*
1054  * I don't know what the parameters are: the first one
1055  * seems to be a timeval pointer, and I suspect the second
1056  * one is the time remaining.. Ho humm.. No documentation.
1057  */
1058 SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep,
1059 		struct timeval32 __user *, remain)
1060 {
1061 	struct timeval tmp;
1062 	unsigned long ticks;
1063 
1064 	if (get_tv32(&tmp, sleep))
1065 		goto fault;
1066 
1067 	ticks = timeval_to_jiffies(&tmp);
1068 
1069 	ticks = schedule_timeout_interruptible(ticks);
1070 
1071 	if (remain) {
1072 		jiffies_to_timeval(ticks, &tmp);
1073 		if (put_tv32(remain, &tmp))
1074 			goto fault;
1075 	}
1076 
1077 	return 0;
1078  fault:
1079 	return -EFAULT;
1080 }
1081 
1082 
1083 struct timex32 {
1084 	unsigned int modes;	/* mode selector */
1085 	long offset;		/* time offset (usec) */
1086 	long freq;		/* frequency offset (scaled ppm) */
1087 	long maxerror;		/* maximum error (usec) */
1088 	long esterror;		/* estimated error (usec) */
1089 	int status;		/* clock command/status */
1090 	long constant;		/* pll time constant */
1091 	long precision;		/* clock precision (usec) (read only) */
1092 	long tolerance;		/* clock frequency tolerance (ppm)
1093 				 * (read only)
1094 				 */
1095 	struct timeval32 time;	/* (read only) */
1096 	long tick;		/* (modified) usecs between clock ticks */
1097 
1098 	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
1099 	long jitter;            /* pps jitter (us) (ro) */
1100 	int shift;              /* interval duration (s) (shift) (ro) */
1101 	long stabil;            /* pps stability (scaled ppm) (ro) */
1102 	long jitcnt;            /* jitter limit exceeded (ro) */
1103 	long calcnt;            /* calibration intervals (ro) */
1104 	long errcnt;            /* calibration errors (ro) */
1105 	long stbcnt;            /* stability limit exceeded (ro) */
1106 
1107 	int  :32; int  :32; int  :32; int  :32;
1108 	int  :32; int  :32; int  :32; int  :32;
1109 	int  :32; int  :32; int  :32; int  :32;
1110 };
1111 
1112 SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p)
1113 {
1114         struct timex txc;
1115 	int ret;
1116 
1117 	/* copy relevant bits of struct timex. */
1118 	if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
1119 	    copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) -
1120 			   offsetof(struct timex32, time)))
1121 	  return -EFAULT;
1122 
1123 	ret = do_adjtimex(&txc);
1124 	if (ret < 0)
1125 	  return ret;
1126 
1127 	/* copy back to timex32 */
1128 	if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
1129 	    (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) -
1130 			  offsetof(struct timex32, tick))) ||
1131 	    (put_tv32(&txc_p->time, &txc.time)))
1132 	  return -EFAULT;
1133 
1134 	return ret;
1135 }
1136 
1137 /* Get an address range which is currently unmapped.  Similar to the
1138    generic version except that we know how to honor ADDR_LIMIT_32BIT.  */
1139 
1140 static unsigned long
1141 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
1142 		         unsigned long limit)
1143 {
1144 	struct vm_area_struct *vma = find_vma(current->mm, addr);
1145 
1146 	while (1) {
1147 		/* At this point:  (!vma || addr < vma->vm_end). */
1148 		if (limit - len < addr)
1149 			return -ENOMEM;
1150 		if (!vma || addr + len <= vma->vm_start)
1151 			return addr;
1152 		addr = vma->vm_end;
1153 		vma = vma->vm_next;
1154 	}
1155 }
1156 
1157 unsigned long
1158 arch_get_unmapped_area(struct file *filp, unsigned long addr,
1159 		       unsigned long len, unsigned long pgoff,
1160 		       unsigned long flags)
1161 {
1162 	unsigned long limit;
1163 
1164 	/* "32 bit" actually means 31 bit, since pointers sign extend.  */
1165 	if (current->personality & ADDR_LIMIT_32BIT)
1166 		limit = 0x80000000;
1167 	else
1168 		limit = TASK_SIZE;
1169 
1170 	if (len > limit)
1171 		return -ENOMEM;
1172 
1173 	if (flags & MAP_FIXED)
1174 		return addr;
1175 
1176 	/* First, see if the given suggestion fits.
1177 
1178 	   The OSF/1 loader (/sbin/loader) relies on us returning an
1179 	   address larger than the requested if one exists, which is
1180 	   a terribly broken way to program.
1181 
1182 	   That said, I can see the use in being able to suggest not
1183 	   merely specific addresses, but regions of memory -- perhaps
1184 	   this feature should be incorporated into all ports?  */
1185 
1186 	if (addr) {
1187 		addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
1188 		if (addr != (unsigned long) -ENOMEM)
1189 			return addr;
1190 	}
1191 
1192 	/* Next, try allocating at TASK_UNMAPPED_BASE.  */
1193 	addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
1194 					 len, limit);
1195 	if (addr != (unsigned long) -ENOMEM)
1196 		return addr;
1197 
1198 	/* Finally, try allocating in low memory.  */
1199 	addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);
1200 
1201 	return addr;
1202 }
1203 
1204 #ifdef CONFIG_OSF4_COMPAT
1205 
1206 /* Clear top 32 bits of iov_len in the user's buffer for
1207    compatibility with old versions of OSF/1 where iov_len
1208    was defined as int. */
1209 static int
1210 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
1211 {
1212 	unsigned long i;
1213 
1214 	for (i = 0 ; i < count ; i++) {
1215 		int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;
1216 
1217 		if (put_user(0, iov_len_high))
1218 			return -EFAULT;
1219 	}
1220 	return 0;
1221 }
1222 
1223 SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
1224 		const struct iovec __user *, vector, unsigned long, count)
1225 {
1226 	if (unlikely(personality(current->personality) == PER_OSF4))
1227 		if (osf_fix_iov_len(vector, count))
1228 			return -EFAULT;
1229 	return sys_readv(fd, vector, count);
1230 }
1231 
1232 SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
1233 		const struct iovec __user *, vector, unsigned long, count)
1234 {
1235 	if (unlikely(personality(current->personality) == PER_OSF4))
1236 		if (osf_fix_iov_len(vector, count))
1237 			return -EFAULT;
1238 	return sys_writev(fd, vector, count);
1239 }
1240 
1241 #endif
1242