xref: /src/usr.sbin/crash/arch/alpha.c

/*	$NetBSD: alpha.c,v 1.1 2023/11/22 02:01:07 thorpej Exp $	*/

/*-
 * Copyright (c) 2023 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: alpha.c,v 1.1 2023/11/22 02:01:07 thorpej Exp $");
#endif /* not lint */

#include <kvm.h>
#include <nlist.h>
#include <err.h>
#include <stdlib.h>

#include <ddb/ddb.h>

#include <machine/frame.h>
#include <machine/pcb.h>
#include <alpha/db_machdep.h>

#include "extern.h"

struct pcb	pcb;
struct trapframe ddb_regs;

extern db_alpha_nlist db_alpha_nl[];

void
db_mach_init(kvm_t *kd)
{

	if (kvm_nlist(kd, db_alpha_nl) == -1) {
		errx(EXIT_FAILURE, "kvm_nlist: %s", kvm_geterr(kd));
	}
	if ((size_t)kvm_read(kd, db_alpha_nl[SYM_dumppcb].n_value,
			     &pcb, sizeof(pcb)) != sizeof(pcb)) {
		warnx("cannot read dumppcb: %s", kvm_geterr(kd));
	}

	memcpy(&ddb_regs.tf_regs[FRAME_S0],
	    &pcb.pcb_context[0], 7 * sizeof(unsigned long));
	ddb_regs.tf_regs[FRAME_RA] = pcb.pcb_context[7];
	ddb_regs.tf_regs[FRAME_SP] = pcb.pcb_hw.apcb_ksp;
	ddb_regp = &ddb_regs;
}