procfs_regs.c revision 87321 
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 * $FreeBSD: head/sys/fs/procfs/procfs_regs.c 87321 2001-12-04 01:35:06Z des $
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/ptrace.h>
49#include <sys/uio.h>
50
51#include <machine/reg.h>
52
53#include <fs/pseudofs/pseudofs.h>
54#include <fs/procfs/procfs.h>
55
56int
57procfs_doprocregs(PFS_FILL_ARGS)
58{
59	int error;
60	struct reg r;
61	char *kv;
62	int kl;
63
64	if (p_candebug(td->td_proc, p))
65		return EPERM;
66	kl = sizeof(r);
67	kv = (char *) &r;
68
69	kv += uio->uio_offset;
70	kl -= uio->uio_offset;
71	if (kl > uio->uio_resid)
72		kl = uio->uio_resid;
73
74	PHOLD(p);
75
76	if (kl < 0)
77		error = EINVAL;
78	else
79		error = proc_read_regs(&p->p_thread, &r); /* XXXKSE */
80	if (error == 0)
81		error = uiomove(kv, kl, uio);
82	if (error == 0 && uio->uio_rw == UIO_WRITE) {
83		if (p->p_stat != SSTOP)
84			error = EBUSY;
85		else
86			error = proc_write_regs(&p->p_thread, &r); /* XXXKSE */
87	}
88	PRELE(p);
89
90	uio->uio_offset = 0;
91	return (error);
92}
93