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kvm_vax.c revision 1.1 
      1 /*-
      2  * Copyright (c) 1992, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software developed by the Computer Systems
      6  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
      7  * BG 91-66 and contributed to Berkeley.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  */
     37 
     38 /*
     39  * VAX machine dependent routines for kvm.  Hopefully, the forthcoming
     40  * vm code will one day obsolete this module.  Furthermore, I hope it
     41  * gets here soon, because this basically is an error stub! (sorry)
     42  * This code may not work anyway.
     43  */
     44 
     45 #include <sys/param.h>
     46 #include <sys/user.h>
     47 #include <sys/proc.h>
     48 #include <sys/stat.h>
     49 #include <unistd.h>
     50 #include <nlist.h>
     51 #include <kvm.h>
     52 
     53 #include <vm/vm.h>
     54 #include <vm/vm_param.h>
     55 
     56 #include <limits.h>
     57 #include <db.h>
     58 
     59 #include "kvm_private.h"
     60 
     61 struct vmstate {
     62 	u_long end;
     63 };
     64 
     65 void
     66 _kvm_freevtop(kd)
     67 	kvm_t *kd;
     68 {
     69 	if (kd->vmst != 0)
     70 		free(kd->vmst);
     71 }
     72 
     73 int
     74 _kvm_initvtop(kd)
     75 	kvm_t *kd;
     76 {
     77 	register int i;
     78 	register int off;
     79 	register struct vmstate *vm;
     80 	struct stat st;
     81 	struct nlist nlist[2];
     82 
     83 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
     84 	if (vm == 0)
     85 		return (-1);
     86 
     87 	kd->vmst = vm;
     88 
     89 	if (fstat(kd->pmfd, &st) < 0)
     90 		return (-1);
     91 
     92 	/* Get end of kernel address */
     93 	nlist[0].n_name = "_end";
     94 	nlist[1].n_name = 0;
     95 	if (kvm_nlist(kd, nlist) != 0) {
     96 		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
     97 		return (-1);
     98 	}
     99 	vm->end = (u_long)nlist[0].n_value;
    100 
    101 	return (0);
    102 }
    103 
    104 #define VA_OFF(va) (va & (NBPG - 1))
    105 
    106 /*
    107  * Translate a kernel virtual address to a physical address using the
    108  * mapping information in kd->vm.  Returns the result in pa, and returns
    109  * the number of bytes that are contiguously available from this
    110  * physical address.  This routine is used only for crashdumps.
    111  */
    112 int
    113 _kvm_kvatop(kd, va, pa)
    114 	kvm_t *kd;
    115 	u_long va;
    116 	u_long *pa;
    117 {
    118 	register int end;
    119 
    120 	if (va < KERNBASE) {
    121 		_kvm_err(kd, 0, "invalid address (%x<%x)", va, KERNBASE);
    122 		return (0);
    123 	}
    124 
    125 	end = kd->vmst->end;
    126 	if (va >= end) {
    127 		_kvm_err(kd, 0, "invalid address (%x>=%x)", va, end);
    128 		return (0);
    129 	}
    130 
    131 	*pa = (va - KERNBASE);
    132 	return (end - va);
    133 }
    134