88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/* $NetBSD: x86.c,v 1.4 2018/08/12 16:00:41 christos Exp $ */
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/*-
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* Copyright (c) 2009 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: x86.c,v 1.4 2018/08/12 16:00:41 christos Exp $");
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#endif /* not lint */
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#include <ddb/ddb.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <err.h>
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#include <stdlib.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <x86/db_machdep.h>
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#include "extern.h"
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#ifdef VM_MIN_KERNEL_ADDRESS_DEFAULT
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vaddr_t vm_min_kernel_address = VM_MIN_KERNEL_ADDRESS_DEFAULT;
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#endif
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static struct nlist nl[] = {
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{ .n_name = "_dumppcb" },
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#ifdef VM_MIN_KERNEL_ADDRESS_DEFAULT
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{ .n_name = "vm_min_kernel_address" },
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#endif
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{ .n_name = NULL },
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};
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struct pcb pcb;
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void
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db_mach_init(kvm_t *kd)
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{
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if (kvm_nlist(kd, nl) == -1) {
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errx(EXIT_FAILURE, "kvm_nlist: %s", kvm_geterr(kd));
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}
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if ((size_t)kvm_read(kd, nl[0].n_value, &pcb, sizeof(pcb)) !=
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sizeof(pcb)) {
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errx(EXIT_FAILURE, "cannot read dumppcb: %s", kvm_geterr(kd));
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}
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#ifdef VM_MIN_KERNEL_ADDRESS_DEFAULT
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if ((size_t)kvm_read(kd, nl[1].n_value, &vm_min_kernel_address,
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sizeof(vm_min_kernel_address)) != sizeof(vm_min_kernel_address)) {
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errx(EXIT_FAILURE, "cannot read vm_min_kernel_address: %s",
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kvm_geterr(kd));
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}
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#endif
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ddb_regs.tf_sp = pcb.pcb_sp;
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ddb_regs.tf_bp = pcb.pcb_bp;
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if (ddb_regs.tf_bp != 0 && ddb_regs.tf_sp != 0) {
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printf("Backtrace from time of crash is available.\n");
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}
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}
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