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kvm_vax.c revision 1.21 
      1 /*	$NetBSD: kvm_vax.c,v 1.21 2022/01/10 19:51:30 christos 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/proc.h>
     45 #include <sys/stat.h>
     46 #include <sys/types.h>
     47 
     48 #include <unistd.h>
     49 #include <nlist.h>
     50 #include <stdlib.h>
     51 #include <kvm.h>
     52 
     53 #include <uvm/uvm_extern.h>
     54 
     55 #include <machine/vmparam.h>
     56 
     57 #include <limits.h>
     58 #include <db.h>
     59 
     60 #include "kvm_private.h"
     61 
     62 __RCSID("$NetBSD: kvm_vax.c,v 1.21 2022/01/10 19:51:30 christos Exp $");
     63 
     64 struct vmstate {
     65 	u_long end;
     66 };
     67 
     68 void
     69 _kvm_freevtop(kvm_t *kd)
     70 {
     71 	if (kd->vmst != 0)
     72 		free(kd->vmst);
     73 }
     74 
     75 int
     76 _kvm_initvtop(kvm_t *kd)
     77 {
     78 	struct vmstate *vm;
     79 	struct stat st;
     80 	struct nlist nl[2];
     81 
     82 	vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
     83 	if (vm == 0)
     84 		return (-1);
     85 
     86 	kd->vmst = vm;
     87 
     88 	if (fstat(kd->pmfd, &st) < 0)
     89 		return (-1);
     90 
     91 	/* Get end of kernel address */
     92 	nl[0].n_name = "_end";
     93 	nl[1].n_name = 0;
     94 	if (kvm_nlist(kd, nl) != 0) {
     95 		_kvm_err(kd, kd->program, "pmap_stod: no such symbol");
     96 		return (-1);
     97 	}
     98 	vm->end = (u_long)nl[0].n_value;
     99 
    100 	return (0);
    101 }
    102 
    103 #define VA_OFF(va) (va & (NBPG - 1))
    104 
    105 /*
    106  * Translate a kernel virtual address to a physical address using the
    107  * mapping information in kd->vm.  Returns the result in pa, and returns
    108  * the number of bytes that are contiguously available from this
    109  * physical address.  This routine is used only for crash dumps.
    110  */
    111 int
    112 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
    113 {
    114 	u_long end;
    115 
    116 	if (va < (u_long) KERNBASE) {
    117 		_kvm_err(kd, 0, "invalid address (%#"PRIxVADDR"<%lx)", va,
    118 		    (u_long)KERNBASE);
    119 		return (0);
    120 	}
    121 
    122 	end = kd->vmst->end;
    123 	if (va >= end) {
    124 		_kvm_err(kd, 0, "invalid address (%#"PRIxVADDR"<%lx)", va,
    125 		    end);
    126 		return (0);
    127 	}
    128 
    129 	*pa = (va - (u_long) KERNBASE);
    130 	return (end - va);
    131 }
    132 
    133 /*
    134  * Translate a physical address to a file-offset in the crash dump.
    135  * XXX - crash dump doesn't work anyway.
    136  */
    137 off_t
    138 _kvm_pa2off(kvm_t *kd, paddr_t pa)
    139 {
    140 	return(kd->dump_off + pa);
    141 }
    142 
    143 
    144 /*
    145  * Machine-dependent initialization for ALL open kvm descriptors,
    146  * not just those for a kernel crash dump.  Some architectures
    147  * have to deal with these NOT being constants!  (i.e. m68k)
    148  */
    149 int
    150 _kvm_mdopen(kvm_t *kd)
    151 {
    152 
    153 	kd->min_uva = VM_MIN_ADDRESS;
    154 	kd->max_uva = VM_MAXUSER_ADDRESS;
    155 
    156 	return (0);
    157 }
    158