xref: /netbsd-src/usr.sbin/crash/arch/alpha.c (revision 699823c2cb58eab32a0cffd6a7d408ce12cb9e52)
1 /*	$NetBSD: alpha.c,v 1.1 2023/11/22 02:01:07 thorpej Exp $	*/
2 
3 /*-
4  * Copyright (c) 2023 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Jason R. Thorpe.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __RCSID("$NetBSD: alpha.c,v 1.1 2023/11/22 02:01:07 thorpej Exp $");
35 #endif /* not lint */
36 
37 #include <kvm.h>
38 #include <nlist.h>
39 #include <err.h>
40 #include <stdlib.h>
41 
42 #include <ddb/ddb.h>
43 
44 #include <machine/frame.h>
45 #include <machine/pcb.h>
46 #include <alpha/db_machdep.h>
47 
48 #include "extern.h"
49 
50 struct pcb	pcb;
51 struct trapframe ddb_regs;
52 
53 extern db_alpha_nlist db_alpha_nl[];
54 
55 void
db_mach_init(kvm_t * kd)56 db_mach_init(kvm_t *kd)
57 {
58 
59 	if (kvm_nlist(kd, db_alpha_nl) == -1) {
60 		errx(EXIT_FAILURE, "kvm_nlist: %s", kvm_geterr(kd));
61 	}
62 	if ((size_t)kvm_read(kd, db_alpha_nl[SYM_dumppcb].n_value,
63 			     &pcb, sizeof(pcb)) != sizeof(pcb)) {
64 		warnx("cannot read dumppcb: %s", kvm_geterr(kd));
65 	}
66 
67 	memcpy(&ddb_regs.tf_regs[FRAME_S0],
68 	    &pcb.pcb_context[0], 7 * sizeof(unsigned long));
69 	ddb_regs.tf_regs[FRAME_RA] = pcb.pcb_context[7];
70 	ddb_regs.tf_regs[FRAME_SP] = pcb.pcb_hw.apcb_ksp;
71 	ddb_regp = &ddb_regs;
72 }
73