procfs_regs.c revision 136004 
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 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	@(#)procfs_regs.c	8.4 (Berkeley) 6/15/94
34 *
35 * From:
36 *	$Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
37 * $FreeBSD: head/sys/fs/procfs/procfs_regs.c 136004 2004-10-01 05:01:17Z das $
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/lock.h>
43#include <sys/mutex.h>
44#include <sys/proc.h>
45#include <sys/ptrace.h>
46#include <sys/uio.h>
47
48#include <machine/reg.h>
49
50#include <fs/pseudofs/pseudofs.h>
51#include <fs/procfs/procfs.h>
52
53int
54procfs_doprocregs(PFS_FILL_ARGS)
55{
56	int error;
57	struct reg r;
58
59	PROC_LOCK(p);
60	KASSERT(p->p_lock > 0, ("proc not held"));
61	if (p_candebug(td, p)) {
62		PROC_UNLOCK(p);
63		return (EPERM);
64	}
65
66	/* XXXKSE: */
67	error = proc_read_regs(FIRST_THREAD_IN_PROC(p), &r);
68	if (error == 0) {
69		PROC_UNLOCK(p);
70		error = uiomove_frombuf(&r, sizeof(r), uio);
71		PROC_LOCK(p);
72	}
73	if (error == 0 && uio->uio_rw == UIO_WRITE) {
74		if (!P_SHOULDSTOP(p))
75			error = EBUSY;
76		else
77			/* XXXKSE: */
78			error = proc_write_regs(FIRST_THREAD_IN_PROC(p), &r);
79	}
80	PROC_UNLOCK(p);
81
82	uio->uio_offset = 0;
83	return (error);
84}
85