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kvm_vax.c revision 1.5 
      1 /*	$NetBSD: kvm_vax.c,v 1.5 1997/08/12 16:34:13 gwr 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 <kvm.h>
     54 
     55 #include <vm/vm.h>
     56 #include <vm/vm_param.h>
     57 
     58 #include <limits.h>
     59 #include <db.h>
     60 
     61 #include "kvm_private.h"
     62 
     63 struct vmstate {
     64 	u_long end;
     65 };
     66 
     67 void
     68 _kvm_freevtop(kd)
     69 	kvm_t *kd;
     70 {
     71 	if (kd->vmst != 0)
     72 		free(kd->vmst);
     73 }
     74 
     75 int
     76 _kvm_initvtop(kd)
     77 	kvm_t *kd;
     78 {
     79 	register int i;
     80 	register int off;
     81 	register struct vmstate *vm;
     82 	struct stat st;
     83 	struct nlist nlist[2];
     84 
     85 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
     86 	if (vm == 0)
     87 		return (-1);
     88 
     89 	kd->vmst = vm;
     90 
     91 	if (fstat(kd->pmfd, &st) < 0)
     92 		return (-1);
     93 
     94 	/* Get end of kernel address */
     95 	nlist[0].n_name = "_end";
     96 	nlist[1].n_name = 0;
     97 	if (kvm_nlist(kd, nlist) != 0) {
     98 		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
     99 		return (-1);
    100 	}
    101 	vm->end = (u_long)nlist[0].n_value;
    102 
    103 	return (0);
    104 }
    105 
    106 #define VA_OFF(va) (va & (NBPG - 1))
    107 
    108 /*
    109  * Translate a kernel virtual address to a physical address using the
    110  * mapping information in kd->vm.  Returns the result in pa, and returns
    111  * the number of bytes that are contiguously available from this
    112  * physical address.  This routine is used only for crashdumps.
    113  */
    114 int
    115 _kvm_kvatop(kd, va, pa)
    116 	kvm_t *kd;
    117 	u_long va;
    118 	u_long *pa;
    119 {
    120 	register int end;
    121 
    122 	if (va < KERNBASE) {
    123 		_kvm_err(kd, 0, "invalid address (%x<%x)", va, KERNBASE);
    124 		return (0);
    125 	}
    126 
    127 	end = kd->vmst->end;
    128 	if (va >= end) {
    129 		_kvm_err(kd, 0, "invalid address (%x>=%x)", va, end);
    130 		return (0);
    131 	}
    132 
    133 	*pa = (va - KERNBASE);
    134 	return (end - va);
    135 }
    136 
    137 /*
    138  * Translate a physical address to a file-offset in the crash-dump.
    139  * XXX - crash-dumps doesn't work anyway.
    140  */
    141 off_t
    142 _kvm_pa2off(kd, pa)
    143 	kvm_t   *kd;
    144 	u_long  pa;
    145 {
    146 	return(kd->dump_off + pa);
    147 }
    148 
    149 
    150 /*
    151  * Machine-dependent initialization for ALL open kvm descriptors,
    152  * not just those for a kernel crash dump.  Some architectures
    153  * have to deal with these NOT being constants!  (i.e. m68k)
    154  */
    155 int
    156 _kvm_mdopen(kd)
    157 	kvm_t	*kd;
    158 {
    159 
    160 	kd->usrstack = USRSTACK;
    161 	kd->min_uva = VM_MIN_ADDRESS;
    162 	kd->max_uva = VM_MAXUSER_ADDRESS;
    163 
    164 	return (0);
    165 }
    166