procfs_regs.c revision 28086 
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_regs.c	8.4 (Berkeley) 6/15/94
38 *
39 * From:
40 *	$Id: procfs_regs.c,v 1.7 1997/08/02 14:32:16 bde Exp $
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#include <vm/vm_extern.h>
50
51int
52procfs_doregs(curp, p, pfs, uio)
53	struct proc *curp;
54	struct proc *p;
55	struct pfsnode *pfs;
56	struct uio *uio;
57{
58	int error;
59	struct reg r;
60	char *kv;
61	int kl;
62
63	if (!CHECKIO(curp, p))
64		return EPERM;
65	kl = sizeof(r);
66	kv = (char *) &r;
67
68	kv += uio->uio_offset;
69	kl -= uio->uio_offset;
70	if (kl > uio->uio_resid)
71		kl = uio->uio_resid;
72
73	PHOLD(p);
74
75	if (kl < 0)
76		error = EINVAL;
77	else
78		error = procfs_read_regs(p, &r);
79	if (error == 0)
80		error = uiomove(kv, kl, uio);
81	if (error == 0 && uio->uio_rw == UIO_WRITE) {
82		if (p->p_stat != SSTOP)
83			error = EBUSY;
84		else
85			error = procfs_write_regs(p, &r);
86	}
87	PRELE(p);
88
89	uio->uio_offset = 0;
90	return (error);
91}
92
93int
94procfs_validregs(p)
95	struct proc *p;
96{
97	return ((p->p_flag & P_SYSTEM) == 0);
98}
99