procfs_dbregs.c revision 136004 
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 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *	From: @(#)procfs_regs.c	8.4 (Berkeley) 6/15/94
40 *
41 * From:
42 *	$Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
43 * $FreeBSD: head/sys/fs/procfs/procfs_dbregs.c 136004 2004-10-01 05:01:17Z das $
44 */
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/lock.h>
49#include <sys/mutex.h>
50#include <sys/proc.h>
51#include <sys/ptrace.h>
52#include <sys/uio.h>
53
54#include <machine/reg.h>
55
56#include <fs/pseudofs/pseudofs.h>
57#include <fs/procfs/procfs.h>
58
59int
60procfs_doprocdbregs(PFS_FILL_ARGS)
61{
62	int error;
63	struct dbreg r;
64
65	PROC_LOCK(p);
66	KASSERT(p->p_lock > 0, ("proc not held"));
67	if (p_candebug(td, p) != 0) {
68		PROC_UNLOCK(p);
69		return (EPERM);
70	}
71
72	/* XXXKSE: */
73	error = proc_read_dbregs(FIRST_THREAD_IN_PROC(p), &r);
74	if (error == 0) {
75		PROC_UNLOCK(p);
76		error = uiomove_frombuf(&r, sizeof(r), uio);
77		PROC_LOCK(p);
78	}
79	if (error == 0 && uio->uio_rw == UIO_WRITE) {
80		if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */
81			error = EBUSY;
82		else
83			/* XXXKSE: */
84			error = proc_write_dbregs(FIRST_THREAD_IN_PROC(p), &r);
85	}
86	PROC_UNLOCK(p);
87
88	uio->uio_offset = 0;
89	return (error);
90}
91