1 /* $NetBSD: mips.c,v 1.1 2020/08/17 04:15:33 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 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __RCSID("$NetBSD: mips.c,v 1.1 2020/08/17 04:15:33 mrg Exp $"); 34 #endif /* not lint */ 35 36 #include <ddb/ddb.h> 37 38 #include <kvm.h> 39 #include <nlist.h> 40 #include <err.h> 41 #include <stdlib.h> 42 43 #include <machine/pcb.h> 44 45 #include "extern.h" 46 47 static struct nlist nl[] = { 48 { .n_name = "dumppcb" }, 49 { .n_name = "cpu_switchto" }, 50 { .n_name = NULL }, 51 }; 52 53 struct pcb pcb; 54 55 void 56 db_mach_init(kvm_t *kd) 57 { 58 59 if (kvm_nlist(kd, nl) == -1) { 60 errx(EXIT_FAILURE, "kvm_nlist: %s", kvm_geterr(kd)); 61 } 62 if ((size_t)kvm_read(kd, nl[0].n_value, &pcb, sizeof(pcb)) != 63 sizeof(pcb)) { 64 warnx("cannot read dumppcb: %s", kvm_geterr(kd)); 65 } 66 } 67 68 /* Provided for db_trace.c. */ 69 vaddr_t 70 db_mach_addr_cpuswitch(void) 71 { 72 return (vaddr_t)nl[1].n_value; 73 } 74