procfs_fpregs.c revision 79335 
1/*
2 * Copyright (c) 1993 Jan-Simon Pendry
3 * Copyright (c) 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Jan-Simon Pendry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    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 79335 2001-07-05 17:10:46Z rwatson $
41 */
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/lock.h>
46#include <sys/mutex.h>
47#include <sys/proc.h>
48#include <sys/vnode.h>
49
50#include <machine/reg.h>
51
52#include <fs/procfs/procfs.h>
53
54#include <vm/vm.h>
55
56int
57procfs_dofpregs(curp, p, pfs, uio)
58	struct proc *curp;
59	struct proc *p;
60	struct pfsnode *pfs;
61	struct uio *uio;
62{
63	int error;
64	struct fpreg r;
65	char *kv;
66	int kl;
67
68	if (p_candebug(curp, p))
69		return EPERM;
70	kl = sizeof(r);
71	kv = (char *) &r;
72
73	kv += uio->uio_offset;
74	kl -= uio->uio_offset;
75	if (kl > uio->uio_resid)
76		kl = uio->uio_resid;
77
78	PHOLD(p);
79
80	if (kl < 0)
81		error = EINVAL;
82	else
83		error = procfs_read_fpregs(p, &r);
84	if (error == 0)
85		error = uiomove(kv, kl, uio);
86	if (error == 0 && uio->uio_rw == UIO_WRITE) {
87		if (p->p_stat != SSTOP)
88			error = EBUSY;
89		else
90			error = procfs_write_fpregs(p, &r);
91	}
92	PRELE(p);
93
94	uio->uio_offset = 0;
95	return (error);
96}
97
98int
99procfs_validfpregs(p)
100	struct proc *p;
101{
102
103	return ((p->p_flag & P_SYSTEM) == 0);
104}
105