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kvm_vax.c revision 1.17 
      1 /*	$NetBSD: kvm_vax.c,v 1.17 2010/09/19 02:07:00 jym 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. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 /*
     37  * VAX machine dependent routines for kvm.  Hopefully, the forthcoming
     38  * vm code will one day obsolete this module.  Furthermore, I hope it
     39  * gets here soon, because this basically is an error stub! (sorry)
     40  * This code may not work anyway.
     41  */
     42 
     43 #include <sys/param.h>
     44 #include <sys/user.h>
     45 #include <sys/proc.h>
     46 #include <sys/stat.h>
     47 #include <unistd.h>
     48 #include <nlist.h>
     49 #include <stdlib.h>
     50 #include <kvm.h>
     51 
     52 #include <uvm/uvm_extern.h>
     53 
     54 #include <machine/vmparam.h>
     55 
     56 #include <limits.h>
     57 #include <db.h>
     58 
     59 #include "kvm_private.h"
     60 
     61 
     62 struct vmstate {
     63 	u_long end;
     64 };
     65 
     66 void
     67 _kvm_freevtop(kvm_t *kd)
     68 {
     69 	if (kd->vmst != 0)
     70 		free(kd->vmst);
     71 }
     72 
     73 int
     74 _kvm_initvtop(kvm_t *kd)
     75 {
     76 	struct vmstate *vm;
     77 	struct stat st;
     78 	struct nlist nl[2];
     79 
     80 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
     81 	if (vm == 0)
     82 		return (-1);
     83 
     84 	kd->vmst = vm;
     85 
     86 	if (fstat(kd->pmfd, &st) < 0)
     87 		return (-1);
     88 
     89 	/* Get end of kernel address */
     90 	nl[0].n_name = "_end";
     91 	nl[1].n_name = 0;
     92 	if (kvm_nlist(kd, nl) != 0) {
     93 		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
     94 		return (-1);
     95 	}
     96 	vm->end = (u_long)nl[0].n_value;
     97 
     98 	return (0);
     99 }
    100 
    101 #define VA_OFF(va) (va & (NBPG - 1))
    102 
    103 /*
    104  * Translate a kernel virtual address to a physical address using the
    105  * mapping information in kd->vm.  Returns the result in pa, and returns
    106  * the number of bytes that are contiguously available from this
    107  * physical address.  This routine is used only for crash dumps.
    108  */
    109 int
    110 _kvm_kvatop(kvm_t *kd, u_long va, u_long *pa)
    111 {
    112 	u_long end;
    113 
    114 	if (va < (u_long) KERNBASE) {
    115 		_kvm_err(kd, 0, "invalid address (%lx<%lx)", va, (u_long) KERNBASE);
    116 		return (0);
    117 	}
    118 
    119 	end = kd->vmst->end;
    120 	if (va >= end) {
    121 		_kvm_err(kd, 0, "invalid address (%lx>=%lx)", va, end);
    122 		return (0);
    123 	}
    124 
    125 	*pa = (va - (u_long) KERNBASE);
    126 	return (end - va);
    127 }
    128 
    129 /*
    130  * Translate a physical address to a file-offset in the crash dump.
    131  * XXX - crash dump doesn't work anyway.
    132  */
    133 off_t
    134 _kvm_pa2off(kvm_t *kd, u_long pa)
    135 {
    136 	return(kd->dump_off + pa);
    137 }
    138 
    139 
    140 /*
    141  * Machine-dependent initialization for ALL open kvm descriptors,
    142  * not just those for a kernel crash dump.  Some architectures
    143  * have to deal with these NOT being constants!  (i.e. m68k)
    144  */
    145 int
    146 _kvm_mdopen(kvm_t *kd)
    147 {
    148 
    149 	kd->usrstack = USRSTACK;
    150 	kd->min_uva = VM_MIN_ADDRESS;
    151 	kd->max_uva = VM_MAXUSER_ADDRESS;
    152 
    153 	return (0);
    154 }
    155