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 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 68 db_mach_addr_cpuswitch(void) 69 { 70 return (vaddr_t)nl[1].n_value; 71 } 72