procfs_dbregs.c revision 65237 
1/*-
2 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
3 *                    All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry under the following copyrights and conditions:
7 *
8 * Copyright (c) 1993 Jan-Simon Pendry
9 * Copyright (c) 1993
10 *	The Regents of the University of California.  All rights reserved.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Jan-Simon Pendry.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 *    notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 *    notice, this list of conditions and the following disclaimer in the
22 *    documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 *    must display the following acknowledgement:
25 *	This product includes software developed by the University of
26 *	California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 *    may be used to endorse or promote products derived from this software
29 *    without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 * $FreeBSD: head/sys/fs/procfs/procfs_dbregs.c 65237 2000-08-30 04:49:09Z rwatson $
44 */
45
46#include <sys/param.h>
47#include <sys/proc.h>
48#include <sys/vnode.h>
49#include <machine/reg.h>
50#include <miscfs/procfs/procfs.h>
51#include <vm/vm.h>
52
53int
54procfs_dodbregs(curp, p, pfs, uio)
55	struct proc *curp;
56	struct proc *p;
57	struct pfsnode *pfs;
58	struct uio *uio;
59{
60	int error;
61	struct dbreg r;
62	char *kv;
63	int kl;
64
65	if (p_can(curp, p, P_CAN_DEBUG, NULL))
66		return (EPERM);
67	kl = sizeof(r);
68	kv = (char *) &r;
69
70	kv += uio->uio_offset;
71	kl -= uio->uio_offset;
72	if (kl > uio->uio_resid)
73		kl = uio->uio_resid;
74
75	PHOLD(p);
76
77	if (kl < 0)
78		error = EINVAL;
79	else
80		error = procfs_read_dbregs(p, &r);
81	if (error == 0)
82		error = uiomove(kv, kl, uio);
83	if (error == 0 && uio->uio_rw == UIO_WRITE) {
84		if (p->p_stat != SSTOP)
85			error = EBUSY;
86		else
87			error = procfs_write_dbregs(p, &r);
88	}
89	PRELE(p);
90
91	uio->uio_offset = 0;
92	return (error);
93}
94
95int
96procfs_validdbregs(p)
97	struct proc *p;
98{
99	return ((p->p_flag & P_SYSTEM) == 0);
100}
101