xref: /openbmc/linux/arch/alpha/kernel/osf_sys.c (revision 384740dc)
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 extern int do_pipe(int *);
50 
51 /*
52  * Brk needs to return an error.  Still support Linux's brk(0) query idiom,
53  * which OSF programs just shouldn't be doing.  We're still not quite
54  * identical to OSF as we don't return 0 on success, but doing otherwise
55  * would require changes to libc.  Hopefully this is good enough.
56  */
57 asmlinkage unsigned long
58 osf_brk(unsigned long brk)
59 {
60 	unsigned long retval = sys_brk(brk);
61 	if (brk && brk != retval)
62 		retval = -ENOMEM;
63 	return retval;
64 }
65 
66 /*
67  * This is pure guess-work..
68  */
69 asmlinkage int
70 osf_set_program_attributes(unsigned long text_start, unsigned long text_len,
71 			   unsigned long bss_start, unsigned long bss_len)
72 {
73 	struct mm_struct *mm;
74 
75 	lock_kernel();
76 	mm = current->mm;
77 	mm->end_code = bss_start + bss_len;
78 	mm->start_brk = bss_start + bss_len;
79 	mm->brk = bss_start + bss_len;
80 #if 0
81 	printk("set_program_attributes(%lx %lx %lx %lx)\n",
82 		text_start, text_len, bss_start, bss_len);
83 #endif
84 	unlock_kernel();
85 	return 0;
86 }
87 
88 /*
89  * OSF/1 directory handling functions...
90  *
91  * The "getdents()" interface is much more sane: the "basep" stuff is
92  * braindamage (it can't really handle filesystems where the directory
93  * offset differences aren't the same as "d_reclen").
94  */
95 #define NAME_OFFSET	offsetof (struct osf_dirent, d_name)
96 
97 struct osf_dirent {
98 	unsigned int d_ino;
99 	unsigned short d_reclen;
100 	unsigned short d_namlen;
101 	char d_name[1];
102 };
103 
104 struct osf_dirent_callback {
105 	struct osf_dirent __user *dirent;
106 	long __user *basep;
107 	unsigned int count;
108 	int error;
109 };
110 
111 static int
112 osf_filldir(void *__buf, const char *name, int namlen, loff_t offset,
113 	    u64 ino, unsigned int d_type)
114 {
115 	struct osf_dirent __user *dirent;
116 	struct osf_dirent_callback *buf = (struct osf_dirent_callback *) __buf;
117 	unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32));
118 	unsigned int d_ino;
119 
120 	buf->error = -EINVAL;	/* only used if we fail */
121 	if (reclen > buf->count)
122 		return -EINVAL;
123 	d_ino = ino;
124 	if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
125 		buf->error = -EOVERFLOW;
126 		return -EOVERFLOW;
127 	}
128 	if (buf->basep) {
129 		if (put_user(offset, buf->basep))
130 			goto Efault;
131 		buf->basep = NULL;
132 	}
133 	dirent = buf->dirent;
134 	if (put_user(d_ino, &dirent->d_ino) ||
135 	    put_user(namlen, &dirent->d_namlen) ||
136 	    put_user(reclen, &dirent->d_reclen) ||
137 	    copy_to_user(dirent->d_name, name, namlen) ||
138 	    put_user(0, dirent->d_name + namlen))
139 		goto Efault;
140 	dirent = (void __user *)dirent + reclen;
141 	buf->dirent = dirent;
142 	buf->count -= reclen;
143 	return 0;
144 Efault:
145 	buf->error = -EFAULT;
146 	return -EFAULT;
147 }
148 
149 asmlinkage int
150 osf_getdirentries(unsigned int fd, struct osf_dirent __user *dirent,
151 		  unsigned int count, long __user *basep)
152 {
153 	int error;
154 	struct file *file;
155 	struct osf_dirent_callback buf;
156 
157 	error = -EBADF;
158 	file = fget(fd);
159 	if (!file)
160 		goto out;
161 
162 	buf.dirent = dirent;
163 	buf.basep = basep;
164 	buf.count = count;
165 	buf.error = 0;
166 
167 	error = vfs_readdir(file, osf_filldir, &buf);
168 	if (error < 0)
169 		goto out_putf;
170 
171 	error = buf.error;
172 	if (count != buf.count)
173 		error = count - buf.count;
174 
175  out_putf:
176 	fput(file);
177  out:
178 	return error;
179 }
180 
181 #undef NAME_OFFSET
182 
183 asmlinkage unsigned long
184 osf_mmap(unsigned long addr, unsigned long len, unsigned long prot,
185 	 unsigned long flags, unsigned long fd, unsigned long off)
186 {
187 	struct file *file = NULL;
188 	unsigned long ret = -EBADF;
189 
190 #if 0
191 	if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
192 		printk("%s: unimplemented OSF mmap flags %04lx\n",
193 			current->comm, flags);
194 #endif
195 	if (!(flags & MAP_ANONYMOUS)) {
196 		file = fget(fd);
197 		if (!file)
198 			goto out;
199 	}
200 	flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
201 	down_write(&current->mm->mmap_sem);
202 	ret = do_mmap(file, addr, len, prot, flags, off);
203 	up_write(&current->mm->mmap_sem);
204 	if (file)
205 		fput(file);
206  out:
207 	return ret;
208 }
209 
210 
211 /*
212  * The OSF/1 statfs structure is much larger, but this should
213  * match the beginning, at least.
214  */
215 struct osf_statfs {
216 	short f_type;
217 	short f_flags;
218 	int f_fsize;
219 	int f_bsize;
220 	int f_blocks;
221 	int f_bfree;
222 	int f_bavail;
223 	int f_files;
224 	int f_ffree;
225 	__kernel_fsid_t f_fsid;
226 };
227 
228 static int
229 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat,
230 		    unsigned long bufsiz)
231 {
232 	struct osf_statfs tmp_stat;
233 
234 	tmp_stat.f_type = linux_stat->f_type;
235 	tmp_stat.f_flags = 0;	/* mount flags */
236 	tmp_stat.f_fsize = linux_stat->f_frsize;
237 	tmp_stat.f_bsize = linux_stat->f_bsize;
238 	tmp_stat.f_blocks = linux_stat->f_blocks;
239 	tmp_stat.f_bfree = linux_stat->f_bfree;
240 	tmp_stat.f_bavail = linux_stat->f_bavail;
241 	tmp_stat.f_files = linux_stat->f_files;
242 	tmp_stat.f_ffree = linux_stat->f_ffree;
243 	tmp_stat.f_fsid = linux_stat->f_fsid;
244 	if (bufsiz > sizeof(tmp_stat))
245 		bufsiz = sizeof(tmp_stat);
246 	return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
247 }
248 
249 static int
250 do_osf_statfs(struct dentry * dentry, struct osf_statfs __user *buffer,
251 	      unsigned long bufsiz)
252 {
253 	struct kstatfs linux_stat;
254 	int error = vfs_statfs(dentry, &linux_stat);
255 	if (!error)
256 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
257 	return error;
258 }
259 
260 asmlinkage int
261 osf_statfs(char __user *pathname, struct osf_statfs __user *buffer, unsigned long bufsiz)
262 {
263 	struct path path;
264 	int retval;
265 
266 	retval = user_path(pathname, &path);
267 	if (!retval) {
268 		retval = do_osf_statfs(path.dentry, buffer, bufsiz);
269 		path_put(&path);
270 	}
271 	return retval;
272 }
273 
274 asmlinkage int
275 osf_fstatfs(unsigned long fd, struct osf_statfs __user *buffer, unsigned long bufsiz)
276 {
277 	struct file *file;
278 	int retval;
279 
280 	retval = -EBADF;
281 	file = fget(fd);
282 	if (file) {
283 		retval = do_osf_statfs(file->f_path.dentry, buffer, bufsiz);
284 		fput(file);
285 	}
286 	return retval;
287 }
288 
289 /*
290  * Uhh.. OSF/1 mount parameters aren't exactly obvious..
291  *
292  * Although to be frank, neither are the native Linux/i386 ones..
293  */
294 struct ufs_args {
295 	char __user *devname;
296 	int flags;
297 	uid_t exroot;
298 };
299 
300 struct cdfs_args {
301 	char __user *devname;
302 	int flags;
303 	uid_t exroot;
304 
305 	/* This has lots more here, which Linux handles with the option block
306 	   but I'm too lazy to do the translation into ASCII.  */
307 };
308 
309 struct procfs_args {
310 	char __user *devname;
311 	int flags;
312 	uid_t exroot;
313 };
314 
315 /*
316  * We can't actually handle ufs yet, so we translate UFS mounts to
317  * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
318  * layout is so braindead it's a major headache doing it.
319  *
320  * Just how long ago was it written? OTOH our UFS driver may be still
321  * unhappy with OSF UFS. [CHECKME]
322  */
323 static int
324 osf_ufs_mount(char *dirname, struct ufs_args __user *args, int flags)
325 {
326 	int retval;
327 	struct cdfs_args tmp;
328 	char *devname;
329 
330 	retval = -EFAULT;
331 	if (copy_from_user(&tmp, args, sizeof(tmp)))
332 		goto out;
333 	devname = getname(tmp.devname);
334 	retval = PTR_ERR(devname);
335 	if (IS_ERR(devname))
336 		goto out;
337 	retval = do_mount(devname, dirname, "ext2", flags, NULL);
338 	putname(devname);
339  out:
340 	return retval;
341 }
342 
343 static int
344 osf_cdfs_mount(char *dirname, struct cdfs_args __user *args, int flags)
345 {
346 	int retval;
347 	struct cdfs_args tmp;
348 	char *devname;
349 
350 	retval = -EFAULT;
351 	if (copy_from_user(&tmp, args, sizeof(tmp)))
352 		goto out;
353 	devname = getname(tmp.devname);
354 	retval = PTR_ERR(devname);
355 	if (IS_ERR(devname))
356 		goto out;
357 	retval = do_mount(devname, dirname, "iso9660", flags, NULL);
358 	putname(devname);
359  out:
360 	return retval;
361 }
362 
363 static int
364 osf_procfs_mount(char *dirname, struct procfs_args __user *args, int flags)
365 {
366 	struct procfs_args tmp;
367 
368 	if (copy_from_user(&tmp, args, sizeof(tmp)))
369 		return -EFAULT;
370 
371 	return do_mount("", dirname, "proc", flags, NULL);
372 }
373 
374 asmlinkage int
375 osf_mount(unsigned long typenr, char __user *path, int flag, void __user *data)
376 {
377 	int retval = -EINVAL;
378 	char *name;
379 
380 	lock_kernel();
381 
382 	name = getname(path);
383 	retval = PTR_ERR(name);
384 	if (IS_ERR(name))
385 		goto out;
386 	switch (typenr) {
387 	case 1:
388 		retval = osf_ufs_mount(name, data, flag);
389 		break;
390 	case 6:
391 		retval = osf_cdfs_mount(name, data, flag);
392 		break;
393 	case 9:
394 		retval = osf_procfs_mount(name, data, flag);
395 		break;
396 	default:
397 		printk("osf_mount(%ld, %x)\n", typenr, flag);
398 	}
399 	putname(name);
400  out:
401 	unlock_kernel();
402 	return retval;
403 }
404 
405 asmlinkage int
406 osf_utsname(char __user *name)
407 {
408 	int error;
409 
410 	down_read(&uts_sem);
411 	error = -EFAULT;
412 	if (copy_to_user(name + 0, utsname()->sysname, 32))
413 		goto out;
414 	if (copy_to_user(name + 32, utsname()->nodename, 32))
415 		goto out;
416 	if (copy_to_user(name + 64, utsname()->release, 32))
417 		goto out;
418 	if (copy_to_user(name + 96, utsname()->version, 32))
419 		goto out;
420 	if (copy_to_user(name + 128, utsname()->machine, 32))
421 		goto out;
422 
423 	error = 0;
424  out:
425 	up_read(&uts_sem);
426 	return error;
427 }
428 
429 asmlinkage unsigned long
430 sys_getpagesize(void)
431 {
432 	return PAGE_SIZE;
433 }
434 
435 asmlinkage unsigned long
436 sys_getdtablesize(void)
437 {
438 	return sysctl_nr_open;
439 }
440 
441 /*
442  * For compatibility with OSF/1 only.  Use utsname(2) instead.
443  */
444 asmlinkage int
445 osf_getdomainname(char __user *name, int namelen)
446 {
447 	unsigned len;
448 	int i;
449 
450 	if (!access_ok(VERIFY_WRITE, name, namelen))
451 		return -EFAULT;
452 
453 	len = namelen;
454 	if (namelen > 32)
455 		len = 32;
456 
457 	down_read(&uts_sem);
458 	for (i = 0; i < len; ++i) {
459 		__put_user(utsname()->domainname[i], name + i);
460 		if (utsname()->domainname[i] == '\0')
461 			break;
462 	}
463 	up_read(&uts_sem);
464 
465 	return 0;
466 }
467 
468 /*
469  * The following stuff should move into a header file should it ever
470  * be labeled "officially supported."  Right now, there is just enough
471  * support to avoid applications (such as tar) printing error
472  * messages.  The attributes are not really implemented.
473  */
474 
475 /*
476  * Values for Property list entry flag
477  */
478 #define PLE_PROPAGATE_ON_COPY		0x1	/* cp(1) will copy entry
479 						   by default */
480 #define PLE_FLAG_MASK			0x1	/* Valid flag values */
481 #define PLE_FLAG_ALL			-1	/* All flag value */
482 
483 struct proplistname_args {
484 	unsigned int pl_mask;
485 	unsigned int pl_numnames;
486 	char **pl_names;
487 };
488 
489 union pl_args {
490 	struct setargs {
491 		char __user *path;
492 		long follow;
493 		long nbytes;
494 		char __user *buf;
495 	} set;
496 	struct fsetargs {
497 		long fd;
498 		long nbytes;
499 		char __user *buf;
500 	} fset;
501 	struct getargs {
502 		char __user *path;
503 		long follow;
504 		struct proplistname_args __user *name_args;
505 		long nbytes;
506 		char __user *buf;
507 		int __user *min_buf_size;
508 	} get;
509 	struct fgetargs {
510 		long fd;
511 		struct proplistname_args __user *name_args;
512 		long nbytes;
513 		char __user *buf;
514 		int __user *min_buf_size;
515 	} fget;
516 	struct delargs {
517 		char __user *path;
518 		long follow;
519 		struct proplistname_args __user *name_args;
520 	} del;
521 	struct fdelargs {
522 		long fd;
523 		struct proplistname_args __user *name_args;
524 	} fdel;
525 };
526 
527 enum pl_code {
528 	PL_SET = 1, PL_FSET = 2,
529 	PL_GET = 3, PL_FGET = 4,
530 	PL_DEL = 5, PL_FDEL = 6
531 };
532 
533 asmlinkage long
534 osf_proplist_syscall(enum pl_code code, union pl_args __user *args)
535 {
536 	long error;
537 	int __user *min_buf_size_ptr;
538 
539 	lock_kernel();
540 	switch (code) {
541 	case PL_SET:
542 		if (get_user(error, &args->set.nbytes))
543 			error = -EFAULT;
544 		break;
545 	case PL_FSET:
546 		if (get_user(error, &args->fset.nbytes))
547 			error = -EFAULT;
548 		break;
549 	case PL_GET:
550 		error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
551 		if (error)
552 			break;
553 		error = put_user(0, min_buf_size_ptr);
554 		break;
555 	case PL_FGET:
556 		error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
557 		if (error)
558 			break;
559 		error = put_user(0, min_buf_size_ptr);
560 		break;
561 	case PL_DEL:
562 	case PL_FDEL:
563 		error = 0;
564 		break;
565 	default:
566 		error = -EOPNOTSUPP;
567 		break;
568 	};
569 	unlock_kernel();
570 	return error;
571 }
572 
573 asmlinkage int
574 osf_sigstack(struct sigstack __user *uss, struct sigstack __user *uoss)
575 {
576 	unsigned long usp = rdusp();
577 	unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
578 	unsigned long oss_os = on_sig_stack(usp);
579 	int error;
580 
581 	if (uss) {
582 		void __user *ss_sp;
583 
584 		error = -EFAULT;
585 		if (get_user(ss_sp, &uss->ss_sp))
586 			goto out;
587 
588 		/* If the current stack was set with sigaltstack, don't
589 		   swap stacks while we are on it.  */
590 		error = -EPERM;
591 		if (current->sas_ss_sp && on_sig_stack(usp))
592 			goto out;
593 
594 		/* Since we don't know the extent of the stack, and we don't
595 		   track onstack-ness, but rather calculate it, we must
596 		   presume a size.  Ho hum this interface is lossy.  */
597 		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
598 		current->sas_ss_size = SIGSTKSZ;
599 	}
600 
601 	if (uoss) {
602 		error = -EFAULT;
603 		if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
604 		    || __put_user(oss_sp, &uoss->ss_sp)
605 		    || __put_user(oss_os, &uoss->ss_onstack))
606 			goto out;
607 	}
608 
609 	error = 0;
610  out:
611 	return error;
612 }
613 
614 asmlinkage long
615 osf_sysinfo(int command, char __user *buf, long count)
616 {
617 	char *sysinfo_table[] = {
618 		utsname()->sysname,
619 		utsname()->nodename,
620 		utsname()->release,
621 		utsname()->version,
622 		utsname()->machine,
623 		"alpha",	/* instruction set architecture */
624 		"dummy",	/* hardware serial number */
625 		"dummy",	/* hardware manufacturer */
626 		"dummy",	/* secure RPC domain */
627 	};
628 	unsigned long offset;
629 	char *res;
630 	long len, err = -EINVAL;
631 
632 	offset = command-1;
633 	if (offset >= ARRAY_SIZE(sysinfo_table)) {
634 		/* Digital UNIX has a few unpublished interfaces here */
635 		printk("sysinfo(%d)", command);
636 		goto out;
637 	}
638 
639 	down_read(&uts_sem);
640 	res = sysinfo_table[offset];
641 	len = strlen(res)+1;
642 	if (len > count)
643 		len = count;
644 	if (copy_to_user(buf, res, len))
645 		err = -EFAULT;
646 	else
647 		err = 0;
648 	up_read(&uts_sem);
649  out:
650 	return err;
651 }
652 
653 asmlinkage unsigned long
654 osf_getsysinfo(unsigned long op, void __user *buffer, unsigned long nbytes,
655 	       int __user *start, void __user *arg)
656 {
657 	unsigned long w;
658 	struct percpu_struct *cpu;
659 
660 	switch (op) {
661 	case GSI_IEEE_FP_CONTROL:
662 		/* Return current software fp control & status bits.  */
663 		/* Note that DU doesn't verify available space here.  */
664 
665  		w = current_thread_info()->ieee_state & IEEE_SW_MASK;
666  		w = swcr_update_status(w, rdfpcr());
667 		if (put_user(w, (unsigned long __user *) buffer))
668 			return -EFAULT;
669 		return 0;
670 
671 	case GSI_IEEE_STATE_AT_SIGNAL:
672 		/*
673 		 * Not sure anybody will ever use this weird stuff.  These
674 		 * ops can be used (under OSF/1) to set the fpcr that should
675 		 * be used when a signal handler starts executing.
676 		 */
677 		break;
678 
679  	case GSI_UACPROC:
680 		if (nbytes < sizeof(unsigned int))
681 			return -EINVAL;
682  		w = (current_thread_info()->flags >> UAC_SHIFT) & UAC_BITMASK;
683  		if (put_user(w, (unsigned int __user *)buffer))
684  			return -EFAULT;
685  		return 1;
686 
687 	case GSI_PROC_TYPE:
688 		if (nbytes < sizeof(unsigned long))
689 			return -EINVAL;
690 		cpu = (struct percpu_struct*)
691 		  ((char*)hwrpb + hwrpb->processor_offset);
692 		w = cpu->type;
693 		if (put_user(w, (unsigned long  __user*)buffer))
694 			return -EFAULT;
695 		return 1;
696 
697 	case GSI_GET_HWRPB:
698 		if (nbytes < sizeof(*hwrpb))
699 			return -EINVAL;
700 		if (copy_to_user(buffer, hwrpb, nbytes) != 0)
701 			return -EFAULT;
702 		return 1;
703 
704 	default:
705 		break;
706 	}
707 
708 	return -EOPNOTSUPP;
709 }
710 
711 asmlinkage unsigned long
712 osf_setsysinfo(unsigned long op, void __user *buffer, unsigned long nbytes,
713 	       int __user *start, void __user *arg)
714 {
715 	switch (op) {
716 	case SSI_IEEE_FP_CONTROL: {
717 		unsigned long swcr, fpcr;
718 		unsigned int *state;
719 
720 		/*
721 		 * Alpha Architecture Handbook 4.7.7.3:
722 		 * To be fully IEEE compiant, we must track the current IEEE
723 		 * exception state in software, because spurious bits can be
724 		 * set in the trap shadow of a software-complete insn.
725 		 */
726 
727 		if (get_user(swcr, (unsigned long __user *)buffer))
728 			return -EFAULT;
729 		state = &current_thread_info()->ieee_state;
730 
731 		/* Update softare trap enable bits.  */
732 		*state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);
733 
734 		/* Update the real fpcr.  */
735 		fpcr = rdfpcr() & FPCR_DYN_MASK;
736 		fpcr |= ieee_swcr_to_fpcr(swcr);
737 		wrfpcr(fpcr);
738 
739 		return 0;
740 	}
741 
742 	case SSI_IEEE_RAISE_EXCEPTION: {
743 		unsigned long exc, swcr, fpcr, fex;
744 		unsigned int *state;
745 
746 		if (get_user(exc, (unsigned long __user *)buffer))
747 			return -EFAULT;
748 		state = &current_thread_info()->ieee_state;
749 		exc &= IEEE_STATUS_MASK;
750 
751 		/* Update softare trap enable bits.  */
752  		swcr = (*state & IEEE_SW_MASK) | exc;
753 		*state |= exc;
754 
755 		/* Update the real fpcr.  */
756 		fpcr = rdfpcr();
757 		fpcr |= ieee_swcr_to_fpcr(swcr);
758 		wrfpcr(fpcr);
759 
760  		/* If any exceptions set by this call, and are unmasked,
761 		   send a signal.  Old exceptions are not signaled.  */
762 		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
763  		if (fex) {
764 			siginfo_t info;
765 			int si_code = 0;
766 
767 			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
768 			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
769 			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
770 			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
771 			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
772 			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
773 
774 			info.si_signo = SIGFPE;
775 			info.si_errno = 0;
776 			info.si_code = si_code;
777 			info.si_addr = NULL;  /* FIXME */
778  			send_sig_info(SIGFPE, &info, current);
779  		}
780 		return 0;
781 	}
782 
783 	case SSI_IEEE_STATE_AT_SIGNAL:
784 	case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
785 		/*
786 		 * Not sure anybody will ever use this weird stuff.  These
787 		 * ops can be used (under OSF/1) to set the fpcr that should
788 		 * be used when a signal handler starts executing.
789 		 */
790 		break;
791 
792  	case SSI_NVPAIRS: {
793 		unsigned long v, w, i;
794 		unsigned int old, new;
795 
796  		for (i = 0; i < nbytes; ++i) {
797 
798  			if (get_user(v, 2*i + (unsigned int __user *)buffer))
799  				return -EFAULT;
800  			if (get_user(w, 2*i + 1 + (unsigned int __user *)buffer))
801  				return -EFAULT;
802  			switch (v) {
803  			case SSIN_UACPROC:
804 			again:
805 				old = current_thread_info()->flags;
806 				new = old & ~(UAC_BITMASK << UAC_SHIFT);
807 				new = new | (w & UAC_BITMASK) << UAC_SHIFT;
808 				if (cmpxchg(&current_thread_info()->flags,
809 					    old, new) != old)
810 					goto again;
811  				break;
812 
813  			default:
814  				return -EOPNOTSUPP;
815  			}
816  		}
817  		return 0;
818 	}
819 
820 	default:
821 		break;
822 	}
823 
824 	return -EOPNOTSUPP;
825 }
826 
827 /* Translations due to the fact that OSF's time_t is an int.  Which
828    affects all sorts of things, like timeval and itimerval.  */
829 
830 extern struct timezone sys_tz;
831 
832 struct timeval32
833 {
834     int tv_sec, tv_usec;
835 };
836 
837 struct itimerval32
838 {
839     struct timeval32 it_interval;
840     struct timeval32 it_value;
841 };
842 
843 static inline long
844 get_tv32(struct timeval *o, struct timeval32 __user *i)
845 {
846 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
847 		(__get_user(o->tv_sec, &i->tv_sec) |
848 		 __get_user(o->tv_usec, &i->tv_usec)));
849 }
850 
851 static inline long
852 put_tv32(struct timeval32 __user *o, struct timeval *i)
853 {
854 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
855 		(__put_user(i->tv_sec, &o->tv_sec) |
856 		 __put_user(i->tv_usec, &o->tv_usec)));
857 }
858 
859 static inline long
860 get_it32(struct itimerval *o, struct itimerval32 __user *i)
861 {
862 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
863 		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
864 		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
865 		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
866 		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
867 }
868 
869 static inline long
870 put_it32(struct itimerval32 __user *o, struct itimerval *i)
871 {
872 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
873 		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
874 		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
875 		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
876 		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
877 }
878 
879 static inline void
880 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
881 {
882 	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
883 	value->tv_sec = jiffies / HZ;
884 }
885 
886 asmlinkage int
887 osf_gettimeofday(struct timeval32 __user *tv, struct timezone __user *tz)
888 {
889 	if (tv) {
890 		struct timeval ktv;
891 		do_gettimeofday(&ktv);
892 		if (put_tv32(tv, &ktv))
893 			return -EFAULT;
894 	}
895 	if (tz) {
896 		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
897 			return -EFAULT;
898 	}
899 	return 0;
900 }
901 
902 asmlinkage int
903 osf_settimeofday(struct timeval32 __user *tv, struct timezone __user *tz)
904 {
905 	struct timespec kts;
906 	struct timezone ktz;
907 
908  	if (tv) {
909 		if (get_tv32((struct timeval *)&kts, tv))
910 			return -EFAULT;
911 	}
912 	if (tz) {
913 		if (copy_from_user(&ktz, tz, sizeof(*tz)))
914 			return -EFAULT;
915 	}
916 
917 	kts.tv_nsec *= 1000;
918 
919 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
920 }
921 
922 asmlinkage int
923 osf_getitimer(int which, struct itimerval32 __user *it)
924 {
925 	struct itimerval kit;
926 	int error;
927 
928 	error = do_getitimer(which, &kit);
929 	if (!error && put_it32(it, &kit))
930 		error = -EFAULT;
931 
932 	return error;
933 }
934 
935 asmlinkage int
936 osf_setitimer(int which, struct itimerval32 __user *in, struct itimerval32 __user *out)
937 {
938 	struct itimerval kin, kout;
939 	int error;
940 
941 	if (in) {
942 		if (get_it32(&kin, in))
943 			return -EFAULT;
944 	} else
945 		memset(&kin, 0, sizeof(kin));
946 
947 	error = do_setitimer(which, &kin, out ? &kout : NULL);
948 	if (error || !out)
949 		return error;
950 
951 	if (put_it32(out, &kout))
952 		return -EFAULT;
953 
954 	return 0;
955 
956 }
957 
958 asmlinkage int
959 osf_utimes(char __user *filename, struct timeval32 __user *tvs)
960 {
961 	struct timespec tv[2];
962 
963 	if (tvs) {
964 		struct timeval ktvs[2];
965 		if (get_tv32(&ktvs[0], &tvs[0]) ||
966 		    get_tv32(&ktvs[1], &tvs[1]))
967 			return -EFAULT;
968 
969 		if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 ||
970 		    ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000)
971 			return -EINVAL;
972 
973 		tv[0].tv_sec = ktvs[0].tv_sec;
974 		tv[0].tv_nsec = 1000 * ktvs[0].tv_usec;
975 		tv[1].tv_sec = ktvs[1].tv_sec;
976 		tv[1].tv_nsec = 1000 * ktvs[1].tv_usec;
977 	}
978 
979 	return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0);
980 }
981 
982 #define MAX_SELECT_SECONDS \
983 	((unsigned long) (MAX_SCHEDULE_TIMEOUT / HZ)-1)
984 
985 asmlinkage int
986 osf_select(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp,
987 	   struct timeval32 __user *tvp)
988 {
989 	s64 timeout = MAX_SCHEDULE_TIMEOUT;
990 	if (tvp) {
991 		time_t sec, usec;
992 
993 		if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
994 		    || __get_user(sec, &tvp->tv_sec)
995 		    || __get_user(usec, &tvp->tv_usec)) {
996 		    	return -EFAULT;
997 		}
998 
999 		if (sec < 0 || usec < 0)
1000 			return -EINVAL;
1001 
1002 		if ((unsigned long) sec < MAX_SELECT_SECONDS) {
1003 			timeout = (usec + 1000000/HZ - 1) / (1000000/HZ);
1004 			timeout += sec * (unsigned long) HZ;
1005 		}
1006 	}
1007 
1008 	/* OSF does not copy back the remaining time.  */
1009 	return core_sys_select(n, inp, outp, exp, &timeout);
1010 }
1011 
1012 struct rusage32 {
1013 	struct timeval32 ru_utime;	/* user time used */
1014 	struct timeval32 ru_stime;	/* system time used */
1015 	long	ru_maxrss;		/* maximum resident set size */
1016 	long	ru_ixrss;		/* integral shared memory size */
1017 	long	ru_idrss;		/* integral unshared data size */
1018 	long	ru_isrss;		/* integral unshared stack size */
1019 	long	ru_minflt;		/* page reclaims */
1020 	long	ru_majflt;		/* page faults */
1021 	long	ru_nswap;		/* swaps */
1022 	long	ru_inblock;		/* block input operations */
1023 	long	ru_oublock;		/* block output operations */
1024 	long	ru_msgsnd;		/* messages sent */
1025 	long	ru_msgrcv;		/* messages received */
1026 	long	ru_nsignals;		/* signals received */
1027 	long	ru_nvcsw;		/* voluntary context switches */
1028 	long	ru_nivcsw;		/* involuntary " */
1029 };
1030 
1031 asmlinkage int
1032 osf_getrusage(int who, struct rusage32 __user *ru)
1033 {
1034 	struct rusage32 r;
1035 
1036 	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
1037 		return -EINVAL;
1038 
1039 	memset(&r, 0, sizeof(r));
1040 	switch (who) {
1041 	case RUSAGE_SELF:
1042 		jiffies_to_timeval32(current->utime, &r.ru_utime);
1043 		jiffies_to_timeval32(current->stime, &r.ru_stime);
1044 		r.ru_minflt = current->min_flt;
1045 		r.ru_majflt = current->maj_flt;
1046 		break;
1047 	case RUSAGE_CHILDREN:
1048 		jiffies_to_timeval32(current->signal->cutime, &r.ru_utime);
1049 		jiffies_to_timeval32(current->signal->cstime, &r.ru_stime);
1050 		r.ru_minflt = current->signal->cmin_flt;
1051 		r.ru_majflt = current->signal->cmaj_flt;
1052 		break;
1053 	}
1054 
1055 	return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1056 }
1057 
1058 asmlinkage long
1059 osf_wait4(pid_t pid, int __user *ustatus, int options,
1060 	  struct rusage32 __user *ur)
1061 {
1062 	struct rusage r;
1063 	long ret, err;
1064 	mm_segment_t old_fs;
1065 
1066 	if (!ur)
1067 		return sys_wait4(pid, ustatus, options, NULL);
1068 
1069 	old_fs = get_fs();
1070 
1071 	set_fs (KERNEL_DS);
1072 	ret = sys_wait4(pid, ustatus, options, (struct rusage __user *) &r);
1073 	set_fs (old_fs);
1074 
1075 	if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
1076 		return -EFAULT;
1077 
1078 	err = 0;
1079 	err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
1080 	err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
1081 	err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
1082 	err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
1083 	err |= __put_user(r.ru_maxrss, &ur->ru_maxrss);
1084 	err |= __put_user(r.ru_ixrss, &ur->ru_ixrss);
1085 	err |= __put_user(r.ru_idrss, &ur->ru_idrss);
1086 	err |= __put_user(r.ru_isrss, &ur->ru_isrss);
1087 	err |= __put_user(r.ru_minflt, &ur->ru_minflt);
1088 	err |= __put_user(r.ru_majflt, &ur->ru_majflt);
1089 	err |= __put_user(r.ru_nswap, &ur->ru_nswap);
1090 	err |= __put_user(r.ru_inblock, &ur->ru_inblock);
1091 	err |= __put_user(r.ru_oublock, &ur->ru_oublock);
1092 	err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
1093 	err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
1094 	err |= __put_user(r.ru_nsignals, &ur->ru_nsignals);
1095 	err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
1096 	err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw);
1097 
1098 	return err ? err : ret;
1099 }
1100 
1101 /*
1102  * I don't know what the parameters are: the first one
1103  * seems to be a timeval pointer, and I suspect the second
1104  * one is the time remaining.. Ho humm.. No documentation.
1105  */
1106 asmlinkage int
1107 osf_usleep_thread(struct timeval32 __user *sleep, struct timeval32 __user *remain)
1108 {
1109 	struct timeval tmp;
1110 	unsigned long ticks;
1111 
1112 	if (get_tv32(&tmp, sleep))
1113 		goto fault;
1114 
1115 	ticks = timeval_to_jiffies(&tmp);
1116 
1117 	ticks = schedule_timeout_interruptible(ticks);
1118 
1119 	if (remain) {
1120 		jiffies_to_timeval(ticks, &tmp);
1121 		if (put_tv32(remain, &tmp))
1122 			goto fault;
1123 	}
1124 
1125 	return 0;
1126  fault:
1127 	return -EFAULT;
1128 }
1129 
1130 
1131 struct timex32 {
1132 	unsigned int modes;	/* mode selector */
1133 	long offset;		/* time offset (usec) */
1134 	long freq;		/* frequency offset (scaled ppm) */
1135 	long maxerror;		/* maximum error (usec) */
1136 	long esterror;		/* estimated error (usec) */
1137 	int status;		/* clock command/status */
1138 	long constant;		/* pll time constant */
1139 	long precision;		/* clock precision (usec) (read only) */
1140 	long tolerance;		/* clock frequency tolerance (ppm)
1141 				 * (read only)
1142 				 */
1143 	struct timeval32 time;	/* (read only) */
1144 	long tick;		/* (modified) usecs between clock ticks */
1145 
1146 	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
1147 	long jitter;            /* pps jitter (us) (ro) */
1148 	int shift;              /* interval duration (s) (shift) (ro) */
1149 	long stabil;            /* pps stability (scaled ppm) (ro) */
1150 	long jitcnt;            /* jitter limit exceeded (ro) */
1151 	long calcnt;            /* calibration intervals (ro) */
1152 	long errcnt;            /* calibration errors (ro) */
1153 	long stbcnt;            /* stability limit exceeded (ro) */
1154 
1155 	int  :32; int  :32; int  :32; int  :32;
1156 	int  :32; int  :32; int  :32; int  :32;
1157 	int  :32; int  :32; int  :32; int  :32;
1158 };
1159 
1160 asmlinkage int
1161 sys_old_adjtimex(struct timex32 __user *txc_p)
1162 {
1163         struct timex txc;
1164 	int ret;
1165 
1166 	/* copy relevant bits of struct timex. */
1167 	if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
1168 	    copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) -
1169 			   offsetof(struct timex32, time)))
1170 	  return -EFAULT;
1171 
1172 	ret = do_adjtimex(&txc);
1173 	if (ret < 0)
1174 	  return ret;
1175 
1176 	/* copy back to timex32 */
1177 	if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
1178 	    (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) -
1179 			  offsetof(struct timex32, tick))) ||
1180 	    (put_tv32(&txc_p->time, &txc.time)))
1181 	  return -EFAULT;
1182 
1183 	return ret;
1184 }
1185 
1186 /* Get an address range which is currently unmapped.  Similar to the
1187    generic version except that we know how to honor ADDR_LIMIT_32BIT.  */
1188 
1189 static unsigned long
1190 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
1191 		         unsigned long limit)
1192 {
1193 	struct vm_area_struct *vma = find_vma(current->mm, addr);
1194 
1195 	while (1) {
1196 		/* At this point:  (!vma || addr < vma->vm_end). */
1197 		if (limit - len < addr)
1198 			return -ENOMEM;
1199 		if (!vma || addr + len <= vma->vm_start)
1200 			return addr;
1201 		addr = vma->vm_end;
1202 		vma = vma->vm_next;
1203 	}
1204 }
1205 
1206 unsigned long
1207 arch_get_unmapped_area(struct file *filp, unsigned long addr,
1208 		       unsigned long len, unsigned long pgoff,
1209 		       unsigned long flags)
1210 {
1211 	unsigned long limit;
1212 
1213 	/* "32 bit" actually means 31 bit, since pointers sign extend.  */
1214 	if (current->personality & ADDR_LIMIT_32BIT)
1215 		limit = 0x80000000;
1216 	else
1217 		limit = TASK_SIZE;
1218 
1219 	if (len > limit)
1220 		return -ENOMEM;
1221 
1222 	if (flags & MAP_FIXED)
1223 		return addr;
1224 
1225 	/* First, see if the given suggestion fits.
1226 
1227 	   The OSF/1 loader (/sbin/loader) relies on us returning an
1228 	   address larger than the requested if one exists, which is
1229 	   a terribly broken way to program.
1230 
1231 	   That said, I can see the use in being able to suggest not
1232 	   merely specific addresses, but regions of memory -- perhaps
1233 	   this feature should be incorporated into all ports?  */
1234 
1235 	if (addr) {
1236 		addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
1237 		if (addr != (unsigned long) -ENOMEM)
1238 			return addr;
1239 	}
1240 
1241 	/* Next, try allocating at TASK_UNMAPPED_BASE.  */
1242 	addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
1243 					 len, limit);
1244 	if (addr != (unsigned long) -ENOMEM)
1245 		return addr;
1246 
1247 	/* Finally, try allocating in low memory.  */
1248 	addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);
1249 
1250 	return addr;
1251 }
1252 
1253 #ifdef CONFIG_OSF4_COMPAT
1254 
1255 /* Clear top 32 bits of iov_len in the user's buffer for
1256    compatibility with old versions of OSF/1 where iov_len
1257    was defined as int. */
1258 static int
1259 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
1260 {
1261 	unsigned long i;
1262 
1263 	for (i = 0 ; i < count ; i++) {
1264 		int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;
1265 
1266 		if (put_user(0, iov_len_high))
1267 			return -EFAULT;
1268 	}
1269 	return 0;
1270 }
1271 
1272 asmlinkage ssize_t
1273 osf_readv(unsigned long fd, const struct iovec __user * vector, unsigned long count)
1274 {
1275 	if (unlikely(personality(current->personality) == PER_OSF4))
1276 		if (osf_fix_iov_len(vector, count))
1277 			return -EFAULT;
1278 	return sys_readv(fd, vector, count);
1279 }
1280 
1281 asmlinkage ssize_t
1282 osf_writev(unsigned long fd, const struct iovec __user * vector, unsigned long count)
1283 {
1284 	if (unlikely(personality(current->personality) == PER_OSF4))
1285 		if (osf_fix_iov_len(vector, count))
1286 			return -EFAULT;
1287 	return sys_writev(fd, vector, count);
1288 }
1289 
1290 #endif
1291