1 /* $NetBSD: mips.c,v 1.2 2021/12/11 19:24:22 mrg Exp $ */
2
3 /*
4 * Copyright (c) 2020 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #ifndef lint
31 __RCSID("$NetBSD: mips.c,v 1.2 2021/12/11 19:24:22 mrg Exp $");
32 #endif /* not lint */
33
34 #include <ddb/ddb.h>
35
36 #include <kvm.h>
37 #include <nlist.h>
38 #include <err.h>
39 #include <stdlib.h>
40
41 #include <machine/pcb.h>
42
43 #include "extern.h"
44
45 static struct nlist nl[] = {
46 { .n_name = "dumppcb" },
47 { .n_name = "cpu_switchto" },
48 { .n_name = NULL },
49 };
50
51 struct pcb pcb;
52
53 void
db_mach_init(kvm_t * kd)54 db_mach_init(kvm_t *kd)
55 {
56
57 if (kvm_nlist(kd, nl) == -1) {
58 errx(EXIT_FAILURE, "kvm_nlist: %s", kvm_geterr(kd));
59 }
60 if ((size_t)kvm_read(kd, nl[0].n_value, &pcb, sizeof(pcb)) !=
61 sizeof(pcb)) {
62 warnx("cannot read dumppcb: %s", kvm_geterr(kd));
63 }
64 }
65
66 /* Provided for db_trace.c. */
67 vaddr_t
db_mach_addr_cpuswitch(void)68 db_mach_addr_cpuswitch(void)
69 {
70 return (vaddr_t)nl[1].n_value;
71 }
72