1 /* $NetBSD: kgdb_machdep.c,v 1.7 2009/01/11 23:20:37 cegger 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 1.7 2009/01/11 23:20:37 cegger 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 */
59 int
kgdb_acc(vaddr_t va,size_t ulen)60 kgdb_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 */
71 void
kgdb_connect(int verbose)72 kgdb_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 */
92 void
kgdb_panic(void)93 kgdb_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