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      1 /*	$NetBSD: kvm_m68k.c,v 1.20 2022/01/10 19:51:30 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1997 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Gordon W. Ross and Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Run-time kvm dispatcher for m68k machines.
     34  * The actual MD code is in the files:
     35  * kvm_m68k_cmn.c kvm_sun3.c ...
     36  *
     37  * Note: This file has to build on ALL m68k machines,
     38  * so do NOT include any <machine/[*].h> files here.
     39  */
     40 
     41 #include <sys/param.h>
     42 #include <sys/exec.h>
     43 #include <sys/kcore.h>
     44 #include <sys/sysctl.h>
     45 #include <sys/types.h>
     46 
     47 #include <stdio.h>
     48 #include <string.h>
     49 #include <stdlib.h>
     50 
     51 #include <unistd.h>
     52 #include <limits.h>
     53 #include <nlist.h>
     54 #include <kvm.h>
     55 #include <db.h>
     56 
     57 #include <m68k/kcore.h>
     58 
     59 #include "kvm_private.h"
     60 #include "kvm_m68k.h"
     61 
     62 __RCSID("$NetBSD: kvm_m68k.c,v 1.20 2022/01/10 19:51:30 christos Exp $");
     63 
     64 struct name_ops {
     65 	const char *name;
     66 	struct kvm_ops *ops;
     67 };
     68 
     69 /*
     70  * Match specific kcore types first, falling into a default.
     71  */
     72 static struct name_ops optbl[] = {
     73 	{ "sun2",	&_kvm_ops_sun2 },
     74 	{ "sun3",	&_kvm_ops_sun3 },
     75 	{ "sun3x",	&_kvm_ops_sun3x },
     76 	{ NULL,		&_kvm_ops_cmn },
     77 };
     78 
     79 /*
     80  * Prepare for translation of kernel virtual addresses into offsets
     81  * into crash dump files.  This is where we do the dispatch work.
     82  */
     83 int
     84 _kvm_initvtop(kvm_t *kd)
     85 {
     86 	cpu_kcore_hdr_t *h;
     87 	struct name_ops *nop;
     88 	struct vmstate *vm;
     89 
     90 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof (*vm));
     91 	if (vm == 0)
     92 		return (-1);
     93 
     94 	kd->vmst = vm;
     95 
     96 	/*
     97 	 * Use the machine name in the kcore header to determine
     98 	 * our ops vector.  When we reach an ops vector with
     99 	 * no name, we've found a default.
    100 	 */
    101 	h = kd->cpu_data;
    102 	h->name[sizeof(h->name) - 1] = '\0';	/* sanity */
    103 	for (nop = optbl; nop->name != NULL; nop++)
    104 		if (strcmp(nop->name, h->name) == 0)
    105 			break;
    106 
    107 	vm->ops = nop->ops;
    108 
    109 	/*
    110 	 * Compute pgshift and pgofset.
    111 	 */
    112 	for (vm->pgshift = 0; (1 << vm->pgshift) < h->page_size; vm->pgshift++)
    113 		/* nothing */ ;
    114 	if ((1 << vm->pgshift) != h->page_size)
    115 		goto bad;
    116 	vm->pgofset = h->page_size - 1;
    117 
    118 	if ((vm->ops->initvtop)(kd) < 0)
    119 		goto bad;
    120 
    121 	return (0);
    122 
    123  bad:
    124 	kd->vmst = NULL;
    125 	free(vm);
    126 	return (-1);
    127 }
    128 
    129 void
    130 _kvm_freevtop(kvm_t *kd)
    131 {
    132 	(kd->vmst->ops->freevtop)(kd);
    133 	free(kd->vmst);
    134 }
    135 
    136 int
    137 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pap)
    138 {
    139 	return ((kd->vmst->ops->kvatop)(kd, va, pap));
    140 }
    141 
    142 off_t
    143 _kvm_pa2off(kvm_t *kd, paddr_t pa)
    144 {
    145 	return ((kd->vmst->ops->pa2off)(kd, pa));
    146 }
    147 
    148 /*
    149  * Machine-dependent initialization for ALL open kvm descriptors,
    150  * not just those for a kernel crash dump.  Some architectures
    151  * have to deal with these NOT being constants!  (i.e. m68k)
    152  */
    153 int
    154 _kvm_mdopen(kvm_t *kd)
    155 {
    156 	u_long max_uva;
    157 	extern struct ps_strings *__ps_strings;
    158 
    159 #if 0	/* XXX - These vary across m68k machines... */
    160 	kd->min_uva = VM_MIN_ADDRESS;
    161 	kd->max_uva = VM_MAXUSER_ADDRESS;
    162 #endif
    163 	/* This is somewhat hack-ish, but it works. */
    164 	max_uva = (u_long) (__ps_strings + 1);
    165 	kd->max_uva  = max_uva;
    166 	kd->min_uva  = 0;
    167 
    168 	return (0);
    169 }
    170