1/*	$NetBSD: kgdb_machdep.c,v 1.6 2006/07/22 06:34:42 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 1990, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
10 *
11 * All advertising materials mentioning features or use of this software
12 * must display the following acknowledgement:
13 *	This product includes software developed by the University of
14 *	California, Lawrence Berkeley Laboratories.
15 *
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
18 * are met:
19 * 1. Redistributions of source code must retain the above copyright
20 *    notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 *    notice, this list of conditions and the following disclaimer in the
23 *    documentation and/or other materials provided with the distribution.
24 * 3. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 *	@(#)kgdb_stub.c	8.4 (Berkeley) 1/12/94
41 */
42
43/*
44 * Machine-dependent part of the KGDB remote "stub"
45 */
46
47#include <sys/cdefs.h>
48__KERNEL_RCSID(0, "$NetBSD: kgdb_machdep.c,v 1.6 2006/07/22 06:34:42 tsutsui Exp $");
49
50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/kgdb.h>
53
54#define INVOKE_KGDB()   __asm volatile("trap  #15")
55
56/*
57 * Determine if the memory at va..(va+len) is valid.
58 */
59int
60kgdb_acc(vaddr_t va, size_t ulen)
61{
62
63	/* Just let the trap handler deal with it. */
64	return 1;
65}
66
67/*
68 * Trap into kgdb to wait for debugger to connect,
69 * noting on the console why nothing else is going on.
70 */
71void
72kgdb_connect(int verbose)
73{
74
75	if (kgdb_dev == NODEV)
76		return;
77
78	if (verbose)
79		printf("kgdb waiting...");
80
81	INVOKE_KGDB();
82
83	if (verbose)
84		printf("connected.\n");
85
86	kgdb_debug_panic = 1;
87}
88
89/*
90 * Decide what to do on panic.
91 */
92void
93kgdb_panic(void)
94{
95	if (kgdb_dev != NODEV && kgdb_debug_panic) {
96		printf("entering kgdb\n");
97		kgdb_connect(kgdb_active == 0);
98	}
99}
100