xref: /openbmc/linux/arch/alpha/kernel/osf_sys.c (revision a06c488d)
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/sysinfo.h>
44 #include <asm/thread_info.h>
45 #include <asm/hwrpb.h>
46 #include <asm/processor.h>
47 
48 /*
49  * Brk needs to return an error.  Still support Linux's brk(0) query idiom,
50  * which OSF programs just shouldn't be doing.  We're still not quite
51  * identical to OSF as we don't return 0 on success, but doing otherwise
52  * would require changes to libc.  Hopefully this is good enough.
53  */
54 SYSCALL_DEFINE1(osf_brk, unsigned long, brk)
55 {
56 	unsigned long retval = sys_brk(brk);
57 	if (brk && brk != retval)
58 		retval = -ENOMEM;
59 	return retval;
60 }
61 
62 /*
63  * This is pure guess-work..
64  */
65 SYSCALL_DEFINE4(osf_set_program_attributes, unsigned long, text_start,
66 		unsigned long, text_len, unsigned long, bss_start,
67 		unsigned long, bss_len)
68 {
69 	struct mm_struct *mm;
70 
71 	mm = current->mm;
72 	mm->end_code = bss_start + bss_len;
73 	mm->start_brk = bss_start + bss_len;
74 	mm->brk = bss_start + bss_len;
75 #if 0
76 	printk("set_program_attributes(%lx %lx %lx %lx)\n",
77 		text_start, text_len, bss_start, bss_len);
78 #endif
79 	return 0;
80 }
81 
82 /*
83  * OSF/1 directory handling functions...
84  *
85  * The "getdents()" interface is much more sane: the "basep" stuff is
86  * braindamage (it can't really handle filesystems where the directory
87  * offset differences aren't the same as "d_reclen").
88  */
89 #define NAME_OFFSET	offsetof (struct osf_dirent, d_name)
90 
91 struct osf_dirent {
92 	unsigned int d_ino;
93 	unsigned short d_reclen;
94 	unsigned short d_namlen;
95 	char d_name[1];
96 };
97 
98 struct osf_dirent_callback {
99 	struct dir_context ctx;
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(struct dir_context *ctx, const char *name, int namlen,
108 	    loff_t offset, u64 ino, unsigned int d_type)
109 {
110 	struct osf_dirent __user *dirent;
111 	struct osf_dirent_callback *buf =
112 		container_of(ctx, struct osf_dirent_callback, ctx);
113 	unsigned int reclen = ALIGN(NAME_OFFSET + namlen + 1, sizeof(u32));
114 	unsigned int d_ino;
115 
116 	buf->error = -EINVAL;	/* only used if we fail */
117 	if (reclen > buf->count)
118 		return -EINVAL;
119 	d_ino = ino;
120 	if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
121 		buf->error = -EOVERFLOW;
122 		return -EOVERFLOW;
123 	}
124 	if (buf->basep) {
125 		if (put_user(offset, buf->basep))
126 			goto Efault;
127 		buf->basep = NULL;
128 	}
129 	dirent = buf->dirent;
130 	if (put_user(d_ino, &dirent->d_ino) ||
131 	    put_user(namlen, &dirent->d_namlen) ||
132 	    put_user(reclen, &dirent->d_reclen) ||
133 	    copy_to_user(dirent->d_name, name, namlen) ||
134 	    put_user(0, dirent->d_name + namlen))
135 		goto Efault;
136 	dirent = (void __user *)dirent + reclen;
137 	buf->dirent = dirent;
138 	buf->count -= reclen;
139 	return 0;
140 Efault:
141 	buf->error = -EFAULT;
142 	return -EFAULT;
143 }
144 
145 SYSCALL_DEFINE4(osf_getdirentries, unsigned int, fd,
146 		struct osf_dirent __user *, dirent, unsigned int, count,
147 		long __user *, basep)
148 {
149 	int error;
150 	struct fd arg = fdget(fd);
151 	struct osf_dirent_callback buf = {
152 		.ctx.actor = osf_filldir,
153 		.dirent = dirent,
154 		.basep = basep,
155 		.count = count
156 	};
157 
158 	if (!arg.file)
159 		return -EBADF;
160 
161 	error = iterate_dir(arg.file, &buf.ctx);
162 	if (error >= 0)
163 		error = buf.error;
164 	if (count != buf.count)
165 		error = count - buf.count;
166 
167 	fdput(arg);
168 	return error;
169 }
170 
171 #undef NAME_OFFSET
172 
173 SYSCALL_DEFINE6(osf_mmap, unsigned long, addr, unsigned long, len,
174 		unsigned long, prot, unsigned long, flags, unsigned long, fd,
175 		unsigned long, off)
176 {
177 	unsigned long ret = -EINVAL;
178 
179 #if 0
180 	if (flags & (_MAP_HASSEMAPHORE | _MAP_INHERIT | _MAP_UNALIGNED))
181 		printk("%s: unimplemented OSF mmap flags %04lx\n",
182 			current->comm, flags);
183 #endif
184 	if ((off + PAGE_ALIGN(len)) < off)
185 		goto out;
186 	if (off & ~PAGE_MASK)
187 		goto out;
188 	ret = sys_mmap_pgoff(addr, len, prot, flags, fd, off >> PAGE_SHIFT);
189  out:
190 	return ret;
191 }
192 
193 struct osf_stat {
194 	int		st_dev;
195 	int		st_pad1;
196 	unsigned	st_mode;
197 	unsigned short	st_nlink;
198 	short		st_nlink_reserved;
199 	unsigned	st_uid;
200 	unsigned	st_gid;
201 	int		st_rdev;
202 	int		st_ldev;
203 	long		st_size;
204 	int		st_pad2;
205 	int		st_uatime;
206 	int		st_pad3;
207 	int		st_umtime;
208 	int		st_pad4;
209 	int		st_uctime;
210 	int		st_pad5;
211 	int		st_pad6;
212 	unsigned	st_flags;
213 	unsigned	st_gen;
214 	long		st_spare[4];
215 	unsigned	st_ino;
216 	int		st_ino_reserved;
217 	int		st_atime;
218 	int		st_atime_reserved;
219 	int		st_mtime;
220 	int		st_mtime_reserved;
221 	int		st_ctime;
222 	int		st_ctime_reserved;
223 	long		st_blksize;
224 	long		st_blocks;
225 };
226 
227 /*
228  * The OSF/1 statfs structure is much larger, but this should
229  * match the beginning, at least.
230  */
231 struct osf_statfs {
232 	short f_type;
233 	short f_flags;
234 	int f_fsize;
235 	int f_bsize;
236 	int f_blocks;
237 	int f_bfree;
238 	int f_bavail;
239 	int f_files;
240 	int f_ffree;
241 	__kernel_fsid_t f_fsid;
242 };
243 
244 struct osf_statfs64 {
245 	short f_type;
246 	short f_flags;
247 	int f_pad1;
248 	int f_pad2;
249 	int f_pad3;
250 	int f_pad4;
251 	int f_pad5;
252 	int f_pad6;
253 	int f_pad7;
254 	__kernel_fsid_t f_fsid;
255 	u_short f_namemax;
256 	short f_reserved1;
257 	int f_spare[8];
258 	char f_pad8[90];
259 	char f_pad9[90];
260 	long mount_info[10];
261 	u_long f_flags2;
262 	long f_spare2[14];
263 	long f_fsize;
264 	long f_bsize;
265 	long f_blocks;
266 	long f_bfree;
267 	long f_bavail;
268 	long f_files;
269 	long f_ffree;
270 };
271 
272 static int
273 linux_to_osf_stat(struct kstat *lstat, struct osf_stat __user *osf_stat)
274 {
275 	struct osf_stat tmp = { 0 };
276 
277 	tmp.st_dev	= lstat->dev;
278 	tmp.st_mode	= lstat->mode;
279 	tmp.st_nlink	= lstat->nlink;
280 	tmp.st_uid	= from_kuid_munged(current_user_ns(), lstat->uid);
281 	tmp.st_gid	= from_kgid_munged(current_user_ns(), lstat->gid);
282 	tmp.st_rdev	= lstat->rdev;
283 	tmp.st_ldev	= lstat->rdev;
284 	tmp.st_size	= lstat->size;
285 	tmp.st_uatime	= lstat->atime.tv_nsec / 1000;
286 	tmp.st_umtime	= lstat->mtime.tv_nsec / 1000;
287 	tmp.st_uctime	= lstat->ctime.tv_nsec / 1000;
288 	tmp.st_ino	= lstat->ino;
289 	tmp.st_atime	= lstat->atime.tv_sec;
290 	tmp.st_mtime	= lstat->mtime.tv_sec;
291 	tmp.st_ctime	= lstat->ctime.tv_sec;
292 	tmp.st_blksize	= lstat->blksize;
293 	tmp.st_blocks	= lstat->blocks;
294 
295 	return copy_to_user(osf_stat, &tmp, sizeof(tmp)) ? -EFAULT : 0;
296 }
297 
298 static int
299 linux_to_osf_statfs(struct kstatfs *linux_stat, struct osf_statfs __user *osf_stat,
300 		    unsigned long bufsiz)
301 {
302 	struct osf_statfs tmp_stat;
303 
304 	tmp_stat.f_type = linux_stat->f_type;
305 	tmp_stat.f_flags = 0;	/* mount flags */
306 	tmp_stat.f_fsize = linux_stat->f_frsize;
307 	tmp_stat.f_bsize = linux_stat->f_bsize;
308 	tmp_stat.f_blocks = linux_stat->f_blocks;
309 	tmp_stat.f_bfree = linux_stat->f_bfree;
310 	tmp_stat.f_bavail = linux_stat->f_bavail;
311 	tmp_stat.f_files = linux_stat->f_files;
312 	tmp_stat.f_ffree = linux_stat->f_ffree;
313 	tmp_stat.f_fsid = linux_stat->f_fsid;
314 	if (bufsiz > sizeof(tmp_stat))
315 		bufsiz = sizeof(tmp_stat);
316 	return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
317 }
318 
319 static int
320 linux_to_osf_statfs64(struct kstatfs *linux_stat, struct osf_statfs64 __user *osf_stat,
321 		      unsigned long bufsiz)
322 {
323 	struct osf_statfs64 tmp_stat = { 0 };
324 
325 	tmp_stat.f_type = linux_stat->f_type;
326 	tmp_stat.f_fsize = linux_stat->f_frsize;
327 	tmp_stat.f_bsize = linux_stat->f_bsize;
328 	tmp_stat.f_blocks = linux_stat->f_blocks;
329 	tmp_stat.f_bfree = linux_stat->f_bfree;
330 	tmp_stat.f_bavail = linux_stat->f_bavail;
331 	tmp_stat.f_files = linux_stat->f_files;
332 	tmp_stat.f_ffree = linux_stat->f_ffree;
333 	tmp_stat.f_fsid = linux_stat->f_fsid;
334 	if (bufsiz > sizeof(tmp_stat))
335 		bufsiz = sizeof(tmp_stat);
336 	return copy_to_user(osf_stat, &tmp_stat, bufsiz) ? -EFAULT : 0;
337 }
338 
339 SYSCALL_DEFINE3(osf_statfs, const char __user *, pathname,
340 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
341 {
342 	struct kstatfs linux_stat;
343 	int error = user_statfs(pathname, &linux_stat);
344 	if (!error)
345 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
346 	return error;
347 }
348 
349 SYSCALL_DEFINE2(osf_stat, char __user *, name, struct osf_stat __user *, buf)
350 {
351 	struct kstat stat;
352 	int error;
353 
354 	error = vfs_stat(name, &stat);
355 	if (error)
356 		return error;
357 
358 	return linux_to_osf_stat(&stat, buf);
359 }
360 
361 SYSCALL_DEFINE2(osf_lstat, char __user *, name, struct osf_stat __user *, buf)
362 {
363 	struct kstat stat;
364 	int error;
365 
366 	error = vfs_lstat(name, &stat);
367 	if (error)
368 		return error;
369 
370 	return linux_to_osf_stat(&stat, buf);
371 }
372 
373 SYSCALL_DEFINE2(osf_fstat, int, fd, struct osf_stat __user *, buf)
374 {
375 	struct kstat stat;
376 	int error;
377 
378 	error = vfs_fstat(fd, &stat);
379 	if (error)
380 		return error;
381 
382 	return linux_to_osf_stat(&stat, buf);
383 }
384 
385 SYSCALL_DEFINE3(osf_fstatfs, unsigned long, fd,
386 		struct osf_statfs __user *, buffer, unsigned long, bufsiz)
387 {
388 	struct kstatfs linux_stat;
389 	int error = fd_statfs(fd, &linux_stat);
390 	if (!error)
391 		error = linux_to_osf_statfs(&linux_stat, buffer, bufsiz);
392 	return error;
393 }
394 
395 SYSCALL_DEFINE3(osf_statfs64, char __user *, pathname,
396 		struct osf_statfs64 __user *, buffer, unsigned long, bufsiz)
397 {
398 	struct kstatfs linux_stat;
399 	int error = user_statfs(pathname, &linux_stat);
400 	if (!error)
401 		error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz);
402 	return error;
403 }
404 
405 SYSCALL_DEFINE3(osf_fstatfs64, unsigned long, fd,
406 		struct osf_statfs64 __user *, buffer, unsigned long, bufsiz)
407 {
408 	struct kstatfs linux_stat;
409 	int error = fd_statfs(fd, &linux_stat);
410 	if (!error)
411 		error = linux_to_osf_statfs64(&linux_stat, buffer, bufsiz);
412 	return error;
413 }
414 
415 /*
416  * Uhh.. OSF/1 mount parameters aren't exactly obvious..
417  *
418  * Although to be frank, neither are the native Linux/i386 ones..
419  */
420 struct ufs_args {
421 	char __user *devname;
422 	int flags;
423 	uid_t exroot;
424 };
425 
426 struct cdfs_args {
427 	char __user *devname;
428 	int flags;
429 	uid_t exroot;
430 
431 	/* This has lots more here, which Linux handles with the option block
432 	   but I'm too lazy to do the translation into ASCII.  */
433 };
434 
435 struct procfs_args {
436 	char __user *devname;
437 	int flags;
438 	uid_t exroot;
439 };
440 
441 /*
442  * We can't actually handle ufs yet, so we translate UFS mounts to
443  * ext2fs mounts. I wouldn't mind a UFS filesystem, but the UFS
444  * layout is so braindead it's a major headache doing it.
445  *
446  * Just how long ago was it written? OTOH our UFS driver may be still
447  * unhappy with OSF UFS. [CHECKME]
448  */
449 static int
450 osf_ufs_mount(const char __user *dirname,
451 	      struct ufs_args __user *args, int flags)
452 {
453 	int retval;
454 	struct cdfs_args tmp;
455 	struct filename *devname;
456 
457 	retval = -EFAULT;
458 	if (copy_from_user(&tmp, args, sizeof(tmp)))
459 		goto out;
460 	devname = getname(tmp.devname);
461 	retval = PTR_ERR(devname);
462 	if (IS_ERR(devname))
463 		goto out;
464 	retval = do_mount(devname->name, dirname, "ext2", flags, NULL);
465 	putname(devname);
466  out:
467 	return retval;
468 }
469 
470 static int
471 osf_cdfs_mount(const char __user *dirname,
472 	       struct cdfs_args __user *args, int flags)
473 {
474 	int retval;
475 	struct cdfs_args tmp;
476 	struct filename *devname;
477 
478 	retval = -EFAULT;
479 	if (copy_from_user(&tmp, args, sizeof(tmp)))
480 		goto out;
481 	devname = getname(tmp.devname);
482 	retval = PTR_ERR(devname);
483 	if (IS_ERR(devname))
484 		goto out;
485 	retval = do_mount(devname->name, dirname, "iso9660", flags, NULL);
486 	putname(devname);
487  out:
488 	return retval;
489 }
490 
491 static int
492 osf_procfs_mount(const char __user *dirname,
493 		 struct procfs_args __user *args, int flags)
494 {
495 	struct procfs_args tmp;
496 
497 	if (copy_from_user(&tmp, args, sizeof(tmp)))
498 		return -EFAULT;
499 
500 	return do_mount("", dirname, "proc", flags, NULL);
501 }
502 
503 SYSCALL_DEFINE4(osf_mount, unsigned long, typenr, const char __user *, path,
504 		int, flag, void __user *, data)
505 {
506 	int retval;
507 
508 	switch (typenr) {
509 	case 1:
510 		retval = osf_ufs_mount(path, data, flag);
511 		break;
512 	case 6:
513 		retval = osf_cdfs_mount(path, data, flag);
514 		break;
515 	case 9:
516 		retval = osf_procfs_mount(path, data, flag);
517 		break;
518 	default:
519 		retval = -EINVAL;
520 		printk("osf_mount(%ld, %x)\n", typenr, flag);
521 	}
522 
523 	return retval;
524 }
525 
526 SYSCALL_DEFINE1(osf_utsname, char __user *, name)
527 {
528 	int error;
529 
530 	down_read(&uts_sem);
531 	error = -EFAULT;
532 	if (copy_to_user(name + 0, utsname()->sysname, 32))
533 		goto out;
534 	if (copy_to_user(name + 32, utsname()->nodename, 32))
535 		goto out;
536 	if (copy_to_user(name + 64, utsname()->release, 32))
537 		goto out;
538 	if (copy_to_user(name + 96, utsname()->version, 32))
539 		goto out;
540 	if (copy_to_user(name + 128, utsname()->machine, 32))
541 		goto out;
542 
543 	error = 0;
544  out:
545 	up_read(&uts_sem);
546 	return error;
547 }
548 
549 SYSCALL_DEFINE0(getpagesize)
550 {
551 	return PAGE_SIZE;
552 }
553 
554 SYSCALL_DEFINE0(getdtablesize)
555 {
556 	return sysctl_nr_open;
557 }
558 
559 /*
560  * For compatibility with OSF/1 only.  Use utsname(2) instead.
561  */
562 SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
563 {
564 	unsigned len;
565 	int i;
566 
567 	if (!access_ok(VERIFY_WRITE, name, namelen))
568 		return -EFAULT;
569 
570 	len = namelen;
571 	if (len > 32)
572 		len = 32;
573 
574 	down_read(&uts_sem);
575 	for (i = 0; i < len; ++i) {
576 		__put_user(utsname()->domainname[i], name + i);
577 		if (utsname()->domainname[i] == '\0')
578 			break;
579 	}
580 	up_read(&uts_sem);
581 
582 	return 0;
583 }
584 
585 /*
586  * The following stuff should move into a header file should it ever
587  * be labeled "officially supported."  Right now, there is just enough
588  * support to avoid applications (such as tar) printing error
589  * messages.  The attributes are not really implemented.
590  */
591 
592 /*
593  * Values for Property list entry flag
594  */
595 #define PLE_PROPAGATE_ON_COPY		0x1	/* cp(1) will copy entry
596 						   by default */
597 #define PLE_FLAG_MASK			0x1	/* Valid flag values */
598 #define PLE_FLAG_ALL			-1	/* All flag value */
599 
600 struct proplistname_args {
601 	unsigned int pl_mask;
602 	unsigned int pl_numnames;
603 	char **pl_names;
604 };
605 
606 union pl_args {
607 	struct setargs {
608 		char __user *path;
609 		long follow;
610 		long nbytes;
611 		char __user *buf;
612 	} set;
613 	struct fsetargs {
614 		long fd;
615 		long nbytes;
616 		char __user *buf;
617 	} fset;
618 	struct getargs {
619 		char __user *path;
620 		long follow;
621 		struct proplistname_args __user *name_args;
622 		long nbytes;
623 		char __user *buf;
624 		int __user *min_buf_size;
625 	} get;
626 	struct fgetargs {
627 		long fd;
628 		struct proplistname_args __user *name_args;
629 		long nbytes;
630 		char __user *buf;
631 		int __user *min_buf_size;
632 	} fget;
633 	struct delargs {
634 		char __user *path;
635 		long follow;
636 		struct proplistname_args __user *name_args;
637 	} del;
638 	struct fdelargs {
639 		long fd;
640 		struct proplistname_args __user *name_args;
641 	} fdel;
642 };
643 
644 enum pl_code {
645 	PL_SET = 1, PL_FSET = 2,
646 	PL_GET = 3, PL_FGET = 4,
647 	PL_DEL = 5, PL_FDEL = 6
648 };
649 
650 SYSCALL_DEFINE2(osf_proplist_syscall, enum pl_code, code,
651 		union pl_args __user *, args)
652 {
653 	long error;
654 	int __user *min_buf_size_ptr;
655 
656 	switch (code) {
657 	case PL_SET:
658 		if (get_user(error, &args->set.nbytes))
659 			error = -EFAULT;
660 		break;
661 	case PL_FSET:
662 		if (get_user(error, &args->fset.nbytes))
663 			error = -EFAULT;
664 		break;
665 	case PL_GET:
666 		error = get_user(min_buf_size_ptr, &args->get.min_buf_size);
667 		if (error)
668 			break;
669 		error = put_user(0, min_buf_size_ptr);
670 		break;
671 	case PL_FGET:
672 		error = get_user(min_buf_size_ptr, &args->fget.min_buf_size);
673 		if (error)
674 			break;
675 		error = put_user(0, min_buf_size_ptr);
676 		break;
677 	case PL_DEL:
678 	case PL_FDEL:
679 		error = 0;
680 		break;
681 	default:
682 		error = -EOPNOTSUPP;
683 		break;
684 	};
685 	return error;
686 }
687 
688 SYSCALL_DEFINE2(osf_sigstack, struct sigstack __user *, uss,
689 		struct sigstack __user *, uoss)
690 {
691 	unsigned long usp = rdusp();
692 	unsigned long oss_sp = current->sas_ss_sp + current->sas_ss_size;
693 	unsigned long oss_os = on_sig_stack(usp);
694 	int error;
695 
696 	if (uss) {
697 		void __user *ss_sp;
698 
699 		error = -EFAULT;
700 		if (get_user(ss_sp, &uss->ss_sp))
701 			goto out;
702 
703 		/* If the current stack was set with sigaltstack, don't
704 		   swap stacks while we are on it.  */
705 		error = -EPERM;
706 		if (current->sas_ss_sp && on_sig_stack(usp))
707 			goto out;
708 
709 		/* Since we don't know the extent of the stack, and we don't
710 		   track onstack-ness, but rather calculate it, we must
711 		   presume a size.  Ho hum this interface is lossy.  */
712 		current->sas_ss_sp = (unsigned long)ss_sp - SIGSTKSZ;
713 		current->sas_ss_size = SIGSTKSZ;
714 	}
715 
716 	if (uoss) {
717 		error = -EFAULT;
718 		if (! access_ok(VERIFY_WRITE, uoss, sizeof(*uoss))
719 		    || __put_user(oss_sp, &uoss->ss_sp)
720 		    || __put_user(oss_os, &uoss->ss_onstack))
721 			goto out;
722 	}
723 
724 	error = 0;
725  out:
726 	return error;
727 }
728 
729 SYSCALL_DEFINE3(osf_sysinfo, int, command, char __user *, buf, long, count)
730 {
731 	const char *sysinfo_table[] = {
732 		utsname()->sysname,
733 		utsname()->nodename,
734 		utsname()->release,
735 		utsname()->version,
736 		utsname()->machine,
737 		"alpha",	/* instruction set architecture */
738 		"dummy",	/* hardware serial number */
739 		"dummy",	/* hardware manufacturer */
740 		"dummy",	/* secure RPC domain */
741 	};
742 	unsigned long offset;
743 	const char *res;
744 	long len, err = -EINVAL;
745 
746 	offset = command-1;
747 	if (offset >= ARRAY_SIZE(sysinfo_table)) {
748 		/* Digital UNIX has a few unpublished interfaces here */
749 		printk("sysinfo(%d)", command);
750 		goto out;
751 	}
752 
753 	down_read(&uts_sem);
754 	res = sysinfo_table[offset];
755 	len = strlen(res)+1;
756 	if ((unsigned long)len > (unsigned long)count)
757 		len = count;
758 	if (copy_to_user(buf, res, len))
759 		err = -EFAULT;
760 	else
761 		err = 0;
762 	up_read(&uts_sem);
763  out:
764 	return err;
765 }
766 
767 SYSCALL_DEFINE5(osf_getsysinfo, unsigned long, op, void __user *, buffer,
768 		unsigned long, nbytes, int __user *, start, void __user *, arg)
769 {
770 	unsigned long w;
771 	struct percpu_struct *cpu;
772 
773 	switch (op) {
774 	case GSI_IEEE_FP_CONTROL:
775 		/* Return current software fp control & status bits.  */
776 		/* Note that DU doesn't verify available space here.  */
777 
778  		w = current_thread_info()->ieee_state & IEEE_SW_MASK;
779  		w = swcr_update_status(w, rdfpcr());
780 		if (put_user(w, (unsigned long __user *) buffer))
781 			return -EFAULT;
782 		return 0;
783 
784 	case GSI_IEEE_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 GSI_UACPROC:
793 		if (nbytes < sizeof(unsigned int))
794 			return -EINVAL;
795 		w = current_thread_info()->status & UAC_BITMASK;
796 		if (put_user(w, (unsigned int __user *)buffer))
797 			return -EFAULT;
798  		return 1;
799 
800 	case GSI_PROC_TYPE:
801 		if (nbytes < sizeof(unsigned long))
802 			return -EINVAL;
803 		cpu = (struct percpu_struct*)
804 		  ((char*)hwrpb + hwrpb->processor_offset);
805 		w = cpu->type;
806 		if (put_user(w, (unsigned long  __user*)buffer))
807 			return -EFAULT;
808 		return 1;
809 
810 	case GSI_GET_HWRPB:
811 		if (nbytes > sizeof(*hwrpb))
812 			return -EINVAL;
813 		if (copy_to_user(buffer, hwrpb, nbytes) != 0)
814 			return -EFAULT;
815 		return 1;
816 
817 	default:
818 		break;
819 	}
820 
821 	return -EOPNOTSUPP;
822 }
823 
824 SYSCALL_DEFINE5(osf_setsysinfo, unsigned long, op, void __user *, buffer,
825 		unsigned long, nbytes, int __user *, start, void __user *, arg)
826 {
827 	switch (op) {
828 	case SSI_IEEE_FP_CONTROL: {
829 		unsigned long swcr, fpcr;
830 		unsigned int *state;
831 
832 		/*
833 		 * Alpha Architecture Handbook 4.7.7.3:
834 		 * To be fully IEEE compiant, we must track the current IEEE
835 		 * exception state in software, because spurious bits can be
836 		 * set in the trap shadow of a software-complete insn.
837 		 */
838 
839 		if (get_user(swcr, (unsigned long __user *)buffer))
840 			return -EFAULT;
841 		state = &current_thread_info()->ieee_state;
842 
843 		/* Update softare trap enable bits.  */
844 		*state = (*state & ~IEEE_SW_MASK) | (swcr & IEEE_SW_MASK);
845 
846 		/* Update the real fpcr.  */
847 		fpcr = rdfpcr() & FPCR_DYN_MASK;
848 		fpcr |= ieee_swcr_to_fpcr(swcr);
849 		wrfpcr(fpcr);
850 
851 		return 0;
852 	}
853 
854 	case SSI_IEEE_RAISE_EXCEPTION: {
855 		unsigned long exc, swcr, fpcr, fex;
856 		unsigned int *state;
857 
858 		if (get_user(exc, (unsigned long __user *)buffer))
859 			return -EFAULT;
860 		state = &current_thread_info()->ieee_state;
861 		exc &= IEEE_STATUS_MASK;
862 
863 		/* Update softare trap enable bits.  */
864  		swcr = (*state & IEEE_SW_MASK) | exc;
865 		*state |= exc;
866 
867 		/* Update the real fpcr.  */
868 		fpcr = rdfpcr();
869 		fpcr |= ieee_swcr_to_fpcr(swcr);
870 		wrfpcr(fpcr);
871 
872  		/* If any exceptions set by this call, and are unmasked,
873 		   send a signal.  Old exceptions are not signaled.  */
874 		fex = (exc >> IEEE_STATUS_TO_EXCSUM_SHIFT) & swcr;
875  		if (fex) {
876 			siginfo_t info;
877 			int si_code = 0;
878 
879 			if (fex & IEEE_TRAP_ENABLE_DNO) si_code = FPE_FLTUND;
880 			if (fex & IEEE_TRAP_ENABLE_INE) si_code = FPE_FLTRES;
881 			if (fex & IEEE_TRAP_ENABLE_UNF) si_code = FPE_FLTUND;
882 			if (fex & IEEE_TRAP_ENABLE_OVF) si_code = FPE_FLTOVF;
883 			if (fex & IEEE_TRAP_ENABLE_DZE) si_code = FPE_FLTDIV;
884 			if (fex & IEEE_TRAP_ENABLE_INV) si_code = FPE_FLTINV;
885 
886 			info.si_signo = SIGFPE;
887 			info.si_errno = 0;
888 			info.si_code = si_code;
889 			info.si_addr = NULL;  /* FIXME */
890  			send_sig_info(SIGFPE, &info, current);
891  		}
892 		return 0;
893 	}
894 
895 	case SSI_IEEE_STATE_AT_SIGNAL:
896 	case SSI_IEEE_IGNORE_STATE_AT_SIGNAL:
897 		/*
898 		 * Not sure anybody will ever use this weird stuff.  These
899 		 * ops can be used (under OSF/1) to set the fpcr that should
900 		 * be used when a signal handler starts executing.
901 		 */
902 		break;
903 
904  	case SSI_NVPAIRS: {
905 		unsigned __user *p = buffer;
906 		unsigned i;
907 
908 		for (i = 0, p = buffer; i < nbytes; ++i, p += 2) {
909 			unsigned v, w, status;
910 
911 			if (get_user(v, p) || get_user(w, p + 1))
912  				return -EFAULT;
913  			switch (v) {
914  			case SSIN_UACPROC:
915 				w &= UAC_BITMASK;
916 				status = current_thread_info()->status;
917 				status = (status & ~UAC_BITMASK) | w;
918 				current_thread_info()->status = status;
919  				break;
920 
921  			default:
922  				return -EOPNOTSUPP;
923  			}
924  		}
925  		return 0;
926 	}
927 
928 	case SSI_LMF:
929 		return 0;
930 
931 	default:
932 		break;
933 	}
934 
935 	return -EOPNOTSUPP;
936 }
937 
938 /* Translations due to the fact that OSF's time_t is an int.  Which
939    affects all sorts of things, like timeval and itimerval.  */
940 
941 extern struct timezone sys_tz;
942 
943 struct timeval32
944 {
945     int tv_sec, tv_usec;
946 };
947 
948 struct itimerval32
949 {
950     struct timeval32 it_interval;
951     struct timeval32 it_value;
952 };
953 
954 static inline long
955 get_tv32(struct timeval *o, struct timeval32 __user *i)
956 {
957 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
958 		(__get_user(o->tv_sec, &i->tv_sec) |
959 		 __get_user(o->tv_usec, &i->tv_usec)));
960 }
961 
962 static inline long
963 put_tv32(struct timeval32 __user *o, struct timeval *i)
964 {
965 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
966 		(__put_user(i->tv_sec, &o->tv_sec) |
967 		 __put_user(i->tv_usec, &o->tv_usec)));
968 }
969 
970 static inline long
971 get_it32(struct itimerval *o, struct itimerval32 __user *i)
972 {
973 	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
974 		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
975 		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
976 		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
977 		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
978 }
979 
980 static inline long
981 put_it32(struct itimerval32 __user *o, struct itimerval *i)
982 {
983 	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
984 		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
985 		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
986 		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
987 		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
988 }
989 
990 static inline void
991 jiffies_to_timeval32(unsigned long jiffies, struct timeval32 *value)
992 {
993 	value->tv_usec = (jiffies % HZ) * (1000000L / HZ);
994 	value->tv_sec = jiffies / HZ;
995 }
996 
997 SYSCALL_DEFINE2(osf_gettimeofday, struct timeval32 __user *, tv,
998 		struct timezone __user *, tz)
999 {
1000 	if (tv) {
1001 		struct timeval ktv;
1002 		do_gettimeofday(&ktv);
1003 		if (put_tv32(tv, &ktv))
1004 			return -EFAULT;
1005 	}
1006 	if (tz) {
1007 		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
1008 			return -EFAULT;
1009 	}
1010 	return 0;
1011 }
1012 
1013 SYSCALL_DEFINE2(osf_settimeofday, struct timeval32 __user *, tv,
1014 		struct timezone __user *, tz)
1015 {
1016 	struct timespec kts;
1017 	struct timezone ktz;
1018 
1019  	if (tv) {
1020 		if (get_tv32((struct timeval *)&kts, tv))
1021 			return -EFAULT;
1022 		kts.tv_nsec *= 1000;
1023 	}
1024 	if (tz) {
1025 		if (copy_from_user(&ktz, tz, sizeof(*tz)))
1026 			return -EFAULT;
1027 	}
1028 
1029 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
1030 }
1031 
1032 SYSCALL_DEFINE2(osf_getitimer, int, which, struct itimerval32 __user *, it)
1033 {
1034 	struct itimerval kit;
1035 	int error;
1036 
1037 	error = do_getitimer(which, &kit);
1038 	if (!error && put_it32(it, &kit))
1039 		error = -EFAULT;
1040 
1041 	return error;
1042 }
1043 
1044 SYSCALL_DEFINE3(osf_setitimer, int, which, struct itimerval32 __user *, in,
1045 		struct itimerval32 __user *, out)
1046 {
1047 	struct itimerval kin, kout;
1048 	int error;
1049 
1050 	if (in) {
1051 		if (get_it32(&kin, in))
1052 			return -EFAULT;
1053 	} else
1054 		memset(&kin, 0, sizeof(kin));
1055 
1056 	error = do_setitimer(which, &kin, out ? &kout : NULL);
1057 	if (error || !out)
1058 		return error;
1059 
1060 	if (put_it32(out, &kout))
1061 		return -EFAULT;
1062 
1063 	return 0;
1064 
1065 }
1066 
1067 SYSCALL_DEFINE2(osf_utimes, const char __user *, filename,
1068 		struct timeval32 __user *, tvs)
1069 {
1070 	struct timespec tv[2];
1071 
1072 	if (tvs) {
1073 		struct timeval ktvs[2];
1074 		if (get_tv32(&ktvs[0], &tvs[0]) ||
1075 		    get_tv32(&ktvs[1], &tvs[1]))
1076 			return -EFAULT;
1077 
1078 		if (ktvs[0].tv_usec < 0 || ktvs[0].tv_usec >= 1000000 ||
1079 		    ktvs[1].tv_usec < 0 || ktvs[1].tv_usec >= 1000000)
1080 			return -EINVAL;
1081 
1082 		tv[0].tv_sec = ktvs[0].tv_sec;
1083 		tv[0].tv_nsec = 1000 * ktvs[0].tv_usec;
1084 		tv[1].tv_sec = ktvs[1].tv_sec;
1085 		tv[1].tv_nsec = 1000 * ktvs[1].tv_usec;
1086 	}
1087 
1088 	return do_utimes(AT_FDCWD, filename, tvs ? tv : NULL, 0);
1089 }
1090 
1091 SYSCALL_DEFINE5(osf_select, int, n, fd_set __user *, inp, fd_set __user *, outp,
1092 		fd_set __user *, exp, struct timeval32 __user *, tvp)
1093 {
1094 	struct timespec end_time, *to = NULL;
1095 	if (tvp) {
1096 		time_t sec, usec;
1097 
1098 		to = &end_time;
1099 
1100 		if (!access_ok(VERIFY_READ, tvp, sizeof(*tvp))
1101 		    || __get_user(sec, &tvp->tv_sec)
1102 		    || __get_user(usec, &tvp->tv_usec)) {
1103 		    	return -EFAULT;
1104 		}
1105 
1106 		if (sec < 0 || usec < 0)
1107 			return -EINVAL;
1108 
1109 		if (poll_select_set_timeout(to, sec, usec * NSEC_PER_USEC))
1110 			return -EINVAL;
1111 
1112 	}
1113 
1114 	/* OSF does not copy back the remaining time.  */
1115 	return core_sys_select(n, inp, outp, exp, to);
1116 }
1117 
1118 struct rusage32 {
1119 	struct timeval32 ru_utime;	/* user time used */
1120 	struct timeval32 ru_stime;	/* system time used */
1121 	long	ru_maxrss;		/* maximum resident set size */
1122 	long	ru_ixrss;		/* integral shared memory size */
1123 	long	ru_idrss;		/* integral unshared data size */
1124 	long	ru_isrss;		/* integral unshared stack size */
1125 	long	ru_minflt;		/* page reclaims */
1126 	long	ru_majflt;		/* page faults */
1127 	long	ru_nswap;		/* swaps */
1128 	long	ru_inblock;		/* block input operations */
1129 	long	ru_oublock;		/* block output operations */
1130 	long	ru_msgsnd;		/* messages sent */
1131 	long	ru_msgrcv;		/* messages received */
1132 	long	ru_nsignals;		/* signals received */
1133 	long	ru_nvcsw;		/* voluntary context switches */
1134 	long	ru_nivcsw;		/* involuntary " */
1135 };
1136 
1137 SYSCALL_DEFINE2(osf_getrusage, int, who, struct rusage32 __user *, ru)
1138 {
1139 	struct rusage32 r;
1140 	cputime_t utime, stime;
1141 	unsigned long utime_jiffies, stime_jiffies;
1142 
1143 	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
1144 		return -EINVAL;
1145 
1146 	memset(&r, 0, sizeof(r));
1147 	switch (who) {
1148 	case RUSAGE_SELF:
1149 		task_cputime(current, &utime, &stime);
1150 		utime_jiffies = cputime_to_jiffies(utime);
1151 		stime_jiffies = cputime_to_jiffies(stime);
1152 		jiffies_to_timeval32(utime_jiffies, &r.ru_utime);
1153 		jiffies_to_timeval32(stime_jiffies, &r.ru_stime);
1154 		r.ru_minflt = current->min_flt;
1155 		r.ru_majflt = current->maj_flt;
1156 		break;
1157 	case RUSAGE_CHILDREN:
1158 		utime_jiffies = cputime_to_jiffies(current->signal->cutime);
1159 		stime_jiffies = cputime_to_jiffies(current->signal->cstime);
1160 		jiffies_to_timeval32(utime_jiffies, &r.ru_utime);
1161 		jiffies_to_timeval32(stime_jiffies, &r.ru_stime);
1162 		r.ru_minflt = current->signal->cmin_flt;
1163 		r.ru_majflt = current->signal->cmaj_flt;
1164 		break;
1165 	}
1166 
1167 	return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1168 }
1169 
1170 SYSCALL_DEFINE4(osf_wait4, pid_t, pid, int __user *, ustatus, int, options,
1171 		struct rusage32 __user *, ur)
1172 {
1173 	struct rusage r;
1174 	long ret, err;
1175 	unsigned int status = 0;
1176 	mm_segment_t old_fs;
1177 
1178 	if (!ur)
1179 		return sys_wait4(pid, ustatus, options, NULL);
1180 
1181 	old_fs = get_fs();
1182 
1183 	set_fs (KERNEL_DS);
1184 	ret = sys_wait4(pid, (unsigned int __user *) &status, options,
1185 			(struct rusage __user *) &r);
1186 	set_fs (old_fs);
1187 
1188 	if (!access_ok(VERIFY_WRITE, ur, sizeof(*ur)))
1189 		return -EFAULT;
1190 
1191 	err = 0;
1192 	err |= put_user(status, ustatus);
1193 	err |= __put_user(r.ru_utime.tv_sec, &ur->ru_utime.tv_sec);
1194 	err |= __put_user(r.ru_utime.tv_usec, &ur->ru_utime.tv_usec);
1195 	err |= __put_user(r.ru_stime.tv_sec, &ur->ru_stime.tv_sec);
1196 	err |= __put_user(r.ru_stime.tv_usec, &ur->ru_stime.tv_usec);
1197 	err |= __put_user(r.ru_maxrss, &ur->ru_maxrss);
1198 	err |= __put_user(r.ru_ixrss, &ur->ru_ixrss);
1199 	err |= __put_user(r.ru_idrss, &ur->ru_idrss);
1200 	err |= __put_user(r.ru_isrss, &ur->ru_isrss);
1201 	err |= __put_user(r.ru_minflt, &ur->ru_minflt);
1202 	err |= __put_user(r.ru_majflt, &ur->ru_majflt);
1203 	err |= __put_user(r.ru_nswap, &ur->ru_nswap);
1204 	err |= __put_user(r.ru_inblock, &ur->ru_inblock);
1205 	err |= __put_user(r.ru_oublock, &ur->ru_oublock);
1206 	err |= __put_user(r.ru_msgsnd, &ur->ru_msgsnd);
1207 	err |= __put_user(r.ru_msgrcv, &ur->ru_msgrcv);
1208 	err |= __put_user(r.ru_nsignals, &ur->ru_nsignals);
1209 	err |= __put_user(r.ru_nvcsw, &ur->ru_nvcsw);
1210 	err |= __put_user(r.ru_nivcsw, &ur->ru_nivcsw);
1211 
1212 	return err ? err : ret;
1213 }
1214 
1215 /*
1216  * I don't know what the parameters are: the first one
1217  * seems to be a timeval pointer, and I suspect the second
1218  * one is the time remaining.. Ho humm.. No documentation.
1219  */
1220 SYSCALL_DEFINE2(osf_usleep_thread, struct timeval32 __user *, sleep,
1221 		struct timeval32 __user *, remain)
1222 {
1223 	struct timeval tmp;
1224 	unsigned long ticks;
1225 
1226 	if (get_tv32(&tmp, sleep))
1227 		goto fault;
1228 
1229 	ticks = timeval_to_jiffies(&tmp);
1230 
1231 	ticks = schedule_timeout_interruptible(ticks);
1232 
1233 	if (remain) {
1234 		jiffies_to_timeval(ticks, &tmp);
1235 		if (put_tv32(remain, &tmp))
1236 			goto fault;
1237 	}
1238 
1239 	return 0;
1240  fault:
1241 	return -EFAULT;
1242 }
1243 
1244 
1245 struct timex32 {
1246 	unsigned int modes;	/* mode selector */
1247 	long offset;		/* time offset (usec) */
1248 	long freq;		/* frequency offset (scaled ppm) */
1249 	long maxerror;		/* maximum error (usec) */
1250 	long esterror;		/* estimated error (usec) */
1251 	int status;		/* clock command/status */
1252 	long constant;		/* pll time constant */
1253 	long precision;		/* clock precision (usec) (read only) */
1254 	long tolerance;		/* clock frequency tolerance (ppm)
1255 				 * (read only)
1256 				 */
1257 	struct timeval32 time;	/* (read only) */
1258 	long tick;		/* (modified) usecs between clock ticks */
1259 
1260 	long ppsfreq;           /* pps frequency (scaled ppm) (ro) */
1261 	long jitter;            /* pps jitter (us) (ro) */
1262 	int shift;              /* interval duration (s) (shift) (ro) */
1263 	long stabil;            /* pps stability (scaled ppm) (ro) */
1264 	long jitcnt;            /* jitter limit exceeded (ro) */
1265 	long calcnt;            /* calibration intervals (ro) */
1266 	long errcnt;            /* calibration errors (ro) */
1267 	long stbcnt;            /* stability limit exceeded (ro) */
1268 
1269 	int  :32; int  :32; int  :32; int  :32;
1270 	int  :32; int  :32; int  :32; int  :32;
1271 	int  :32; int  :32; int  :32; int  :32;
1272 };
1273 
1274 SYSCALL_DEFINE1(old_adjtimex, struct timex32 __user *, txc_p)
1275 {
1276         struct timex txc;
1277 	int ret;
1278 
1279 	/* copy relevant bits of struct timex. */
1280 	if (copy_from_user(&txc, txc_p, offsetof(struct timex32, time)) ||
1281 	    copy_from_user(&txc.tick, &txc_p->tick, sizeof(struct timex32) -
1282 			   offsetof(struct timex32, time)))
1283 	  return -EFAULT;
1284 
1285 	ret = do_adjtimex(&txc);
1286 	if (ret < 0)
1287 	  return ret;
1288 
1289 	/* copy back to timex32 */
1290 	if (copy_to_user(txc_p, &txc, offsetof(struct timex32, time)) ||
1291 	    (copy_to_user(&txc_p->tick, &txc.tick, sizeof(struct timex32) -
1292 			  offsetof(struct timex32, tick))) ||
1293 	    (put_tv32(&txc_p->time, &txc.time)))
1294 	  return -EFAULT;
1295 
1296 	return ret;
1297 }
1298 
1299 /* Get an address range which is currently unmapped.  Similar to the
1300    generic version except that we know how to honor ADDR_LIMIT_32BIT.  */
1301 
1302 static unsigned long
1303 arch_get_unmapped_area_1(unsigned long addr, unsigned long len,
1304 		         unsigned long limit)
1305 {
1306 	struct vm_unmapped_area_info info;
1307 
1308 	info.flags = 0;
1309 	info.length = len;
1310 	info.low_limit = addr;
1311 	info.high_limit = limit;
1312 	info.align_mask = 0;
1313 	info.align_offset = 0;
1314 	return vm_unmapped_area(&info);
1315 }
1316 
1317 unsigned long
1318 arch_get_unmapped_area(struct file *filp, unsigned long addr,
1319 		       unsigned long len, unsigned long pgoff,
1320 		       unsigned long flags)
1321 {
1322 	unsigned long limit;
1323 
1324 	/* "32 bit" actually means 31 bit, since pointers sign extend.  */
1325 	if (current->personality & ADDR_LIMIT_32BIT)
1326 		limit = 0x80000000;
1327 	else
1328 		limit = TASK_SIZE;
1329 
1330 	if (len > limit)
1331 		return -ENOMEM;
1332 
1333 	if (flags & MAP_FIXED)
1334 		return addr;
1335 
1336 	/* First, see if the given suggestion fits.
1337 
1338 	   The OSF/1 loader (/sbin/loader) relies on us returning an
1339 	   address larger than the requested if one exists, which is
1340 	   a terribly broken way to program.
1341 
1342 	   That said, I can see the use in being able to suggest not
1343 	   merely specific addresses, but regions of memory -- perhaps
1344 	   this feature should be incorporated into all ports?  */
1345 
1346 	if (addr) {
1347 		addr = arch_get_unmapped_area_1 (PAGE_ALIGN(addr), len, limit);
1348 		if (addr != (unsigned long) -ENOMEM)
1349 			return addr;
1350 	}
1351 
1352 	/* Next, try allocating at TASK_UNMAPPED_BASE.  */
1353 	addr = arch_get_unmapped_area_1 (PAGE_ALIGN(TASK_UNMAPPED_BASE),
1354 					 len, limit);
1355 	if (addr != (unsigned long) -ENOMEM)
1356 		return addr;
1357 
1358 	/* Finally, try allocating in low memory.  */
1359 	addr = arch_get_unmapped_area_1 (PAGE_SIZE, len, limit);
1360 
1361 	return addr;
1362 }
1363 
1364 #ifdef CONFIG_OSF4_COMPAT
1365 
1366 /* Clear top 32 bits of iov_len in the user's buffer for
1367    compatibility with old versions of OSF/1 where iov_len
1368    was defined as int. */
1369 static int
1370 osf_fix_iov_len(const struct iovec __user *iov, unsigned long count)
1371 {
1372 	unsigned long i;
1373 
1374 	for (i = 0 ; i < count ; i++) {
1375 		int __user *iov_len_high = (int __user *)&iov[i].iov_len + 1;
1376 
1377 		if (put_user(0, iov_len_high))
1378 			return -EFAULT;
1379 	}
1380 	return 0;
1381 }
1382 
1383 SYSCALL_DEFINE3(osf_readv, unsigned long, fd,
1384 		const struct iovec __user *, vector, unsigned long, count)
1385 {
1386 	if (unlikely(personality(current->personality) == PER_OSF4))
1387 		if (osf_fix_iov_len(vector, count))
1388 			return -EFAULT;
1389 	return sys_readv(fd, vector, count);
1390 }
1391 
1392 SYSCALL_DEFINE3(osf_writev, unsigned long, fd,
1393 		const struct iovec __user *, vector, unsigned long, count)
1394 {
1395 	if (unlikely(personality(current->personality) == PER_OSF4))
1396 		if (osf_fix_iov_len(vector, count))
1397 			return -EFAULT;
1398 	return sys_writev(fd, vector, count);
1399 }
1400 
1401 #endif
1402 
1403 SYSCALL_DEFINE2(osf_getpriority, int, which, int, who)
1404 {
1405 	int prio = sys_getpriority(which, who);
1406 	if (prio >= 0) {
1407 		/* Return value is the unbiased priority, i.e. 20 - prio.
1408 		   This does result in negative return values, so signal
1409 		   no error */
1410 		force_successful_syscall_return();
1411 		prio = 20 - prio;
1412 	}
1413 	return prio;
1414 }
1415 
1416 SYSCALL_DEFINE0(getxuid)
1417 {
1418 	current_pt_regs()->r20 = sys_geteuid();
1419 	return sys_getuid();
1420 }
1421 
1422 SYSCALL_DEFINE0(getxgid)
1423 {
1424 	current_pt_regs()->r20 = sys_getegid();
1425 	return sys_getgid();
1426 }
1427 
1428 SYSCALL_DEFINE0(getxpid)
1429 {
1430 	current_pt_regs()->r20 = sys_getppid();
1431 	return sys_getpid();
1432 }
1433 
1434 SYSCALL_DEFINE0(alpha_pipe)
1435 {
1436 	int fd[2];
1437 	int res = do_pipe_flags(fd, 0);
1438 	if (!res) {
1439 		/* The return values are in $0 and $20.  */
1440 		current_pt_regs()->r20 = fd[1];
1441 		res = fd[0];
1442 	}
1443 	return res;
1444 }
1445 
1446 SYSCALL_DEFINE1(sethae, unsigned long, val)
1447 {
1448 	current_pt_regs()->hae = val;
1449 	return 0;
1450 }
1451