procfs_fpregs.c revision 54292 
187419Sdes/*
287419Sdes * Copyright (c) 1993 Jan-Simon Pendry
387419Sdes * Copyright (c) 1993
487419Sdes *	The Regents of the University of California.  All rights reserved.
587419Sdes *
687419Sdes * This code is derived from software contributed to Berkeley by
787419Sdes * Jan-Simon Pendry.
887419Sdes *
987419Sdes * Redistribution and use in source and binary forms, with or without
1087419Sdes * modification, are permitted provided that the following conditions
1187419Sdes * are met:
1287419Sdes * 1. Redistributions of source code must retain the above copyright
1387419Sdes *    notice, this list of conditions and the following disclaimer.
1487419Sdes * 2. Redistributions in binary form must reproduce the above copyright
1587419Sdes *    notice, this list of conditions and the following disclaimer in the
1687419Sdes *    documentation and/or other materials provided with the distribution.
1787419Sdes * 3. All advertising materials mentioning features or use of this software
1887419Sdes *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 *	@(#)procfs_fpregs.c	8.2 (Berkeley) 6/15/94
38 *
39 * From:
40 * $FreeBSD: head/sys/fs/procfs/procfs_fpregs.c 54292 1999-12-08 08:59:40Z phk $
41 */
42
43#include <sys/param.h>
44#include <sys/proc.h>
45#include <sys/vnode.h>
46#include <machine/reg.h>
47#include <miscfs/procfs/procfs.h>
48#include <vm/vm.h>
49
50int
51procfs_dofpregs(curp, p, pfs, uio)
52	struct proc *curp;
53	struct proc *p;
54	struct pfsnode *pfs;
55	struct uio *uio;
56{
57	int error;
58	struct fpreg r;
59	char *kv;
60	int kl;
61
62	if (p_trespass(curp, p))
63		return EPERM;
64	kl = sizeof(r);
65	kv = (char *) &r;
66
67	kv += uio->uio_offset;
68	kl -= uio->uio_offset;
69	if (kl > uio->uio_resid)
70		kl = uio->uio_resid;
71
72	PHOLD(p);
73
74	if (kl < 0)
75		error = EINVAL;
76	else
77		error = procfs_read_fpregs(p, &r);
78	if (error == 0)
79		error = uiomove(kv, kl, uio);
80	if (error == 0 && uio->uio_rw == UIO_WRITE) {
81		if (p->p_stat != SSTOP)
82			error = EBUSY;
83		else
84			error = procfs_write_fpregs(p, &r);
85	}
86	PRELE(p);
87
88	uio->uio_offset = 0;
89	return (error);
90}
91
92int
93procfs_validfpregs(p)
94	struct proc *p;
95{
96	return ((p->p_flag & P_SYSTEM) == 0);
97}
98