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mips.c revision 1.1 
      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