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      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