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kvm_vax.c revision 1.7.2.2 
      1 /*	$NetBSD: kvm_vax.c,v 1.7.2.2 2000/10/27 21:59:37 he Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1992, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software developed by the Computer Systems
      8  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
      9  * BG 91-66 and contributed to Berkeley.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  */
     39 
     40 /*
     41  * VAX machine dependent routines for kvm.  Hopefully, the forthcoming
     42  * vm code will one day obsolete this module.  Furthermore, I hope it
     43  * gets here soon, because this basically is an error stub! (sorry)
     44  * This code may not work anyway.
     45  */
     46 
     47 #include <sys/param.h>
     48 #include <sys/user.h>
     49 #include <sys/proc.h>
     50 #include <sys/stat.h>
     51 #include <unistd.h>
     52 #include <nlist.h>
     53 #include <stdlib.h>
     54 #include <kvm.h>
     55 
     56 #include <vm/vm.h>
     57 #include <vm/vm_param.h>
     58 
     59 #include <limits.h>
     60 #include <db.h>
     61 
     62 #include "kvm_private.h"
     63 
     64 struct vmstate {
     65 	u_long end;
     66 };
     67 
     68 void
     69 _kvm_freevtop(kd)
     70 	kvm_t *kd;
     71 {
     72 	if (kd->vmst != 0)
     73 		free(kd->vmst);
     74 }
     75 
     76 int
     77 _kvm_initvtop(kd)
     78 	kvm_t *kd;
     79 {
     80 	struct vmstate *vm;
     81 	struct stat st;
     82 	struct nlist nlist[2];
     83 
     84 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
     85 	if (vm == 0)
     86 		return (-1);
     87 
     88 	kd->vmst = vm;
     89 
     90 	if (fstat(kd->pmfd, &st) < 0)
     91 		return (-1);
     92 
     93 	/* Get end of kernel address */
     94 	nlist[0].n_name = "_end";
     95 	nlist[1].n_name = 0;
     96 	if (kvm_nlist(kd, nlist) != 0) {
     97 		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
     98 		return (-1);
     99 	}
    100 	vm->end = (u_long)nlist[0].n_value;
    101 
    102 	return (0);
    103 }
    104 
    105 #define VA_OFF(va) (va & (NBPG - 1))
    106 
    107 /*
    108  * Translate a kernel virtual address to a physical address using the
    109  * mapping information in kd->vm.  Returns the result in pa, and returns
    110  * the number of bytes that are contiguously available from this
    111  * physical address.  This routine is used only for crashdumps.
    112  */
    113 int
    114 _kvm_kvatop(kd, va, pa)
    115 	kvm_t *kd;
    116 	u_long va;
    117 	u_long *pa;
    118 {
    119 	u_long end;
    120 
    121 	if (va < (u_long) KERNBASE) {
    122 		_kvm_err(kd, 0, "invalid address (%lx<%lx)", va, (u_long) KERNBASE);
    123 		return (0);
    124 	}
    125 
    126 	end = kd->vmst->end;
    127 	if (va >= end) {
    128 		_kvm_err(kd, 0, "invalid address (%lx>=%lx)", va, end);
    129 		return (0);
    130 	}
    131 
    132 	*pa = (va - (u_long) KERNBASE);
    133 	return (end - va);
    134 }
    135 
    136 /*
    137  * Translate a physical address to a file-offset in the crash-dump.
    138  * XXX - crash-dumps doesn't work anyway.
    139  */
    140 off_t
    141 _kvm_pa2off(kd, pa)
    142 	kvm_t   *kd;
    143 	u_long  pa;
    144 {
    145 	return(kd->dump_off + pa);
    146 }
    147 
    148 
    149 /*
    150  * Machine-dependent initialization for ALL open kvm descriptors,
    151  * not just those for a kernel crash dump.  Some architectures
    152  * have to deal with these NOT being constants!  (i.e. m68k)
    153  */
    154 int
    155 _kvm_mdopen(kd)
    156 	kvm_t	*kd;
    157 {
    158 
    159 	kd->usrstack = USRSTACK;
    160 	kd->min_uva = VM_MIN_ADDRESS;
    161 	kd->max_uva = VM_MAXUSER_ADDRESS;
    162 
    163 	return (0);
    164 }
    165