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kvm_sun3.c revision 1.4 
      1 /*	$NetBSD: kvm_sun3.c,v 1.4 1996/05/05 04:32:18 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 #if defined(LIBC_SCCS) && !defined(lint)
     41 #if 0
     42 static char sccsid[] = "@(#)kvm_sparc.c	8.1 (Berkeley) 6/4/93";
     43 #else
     44 static char *rcsid = "$NetBSD: kvm_sun3.c,v 1.4 1996/05/05 04:32:18 gwr Exp $";
     45 #endif
     46 #endif /* LIBC_SCCS and not lint */
     47 
     48 /*
     49  * Sun3 machine dependent routines for kvm.
     50  */
     51 
     52 #include <sys/param.h>
     53 #include <sys/user.h>
     54 #include <sys/proc.h>
     55 #include <sys/stat.h>
     56 
     57 #include <sys/core.h>
     58 #include <sys/exec_aout.h>
     59 #include <sys/kcore.h>
     60 
     61 #include <unistd.h>
     62 #include <limits.h>
     63 #include <nlist.h>
     64 #include <kvm.h>
     65 #include <db.h>
     66 
     67 #include <vm/vm.h>
     68 #include <vm/vm_param.h>
     69 
     70 #include <machine/kcore.h>
     71 #include <machine/pte.h>
     72 
     73 #include "kvm_private.h"
     74 
     75 #define NKSEG (NSEGMAP/8)	/* kernel segmap entries */
     76 struct vmstate {
     77 	/* Page Map Entry Group (PMEG) */
     78 	int   pmeg[NKSEG][NPAGSEG];
     79 };
     80 
     81 /*
     82  * Prepare for translation of kernel virtual addresses into offsets
     83  * into crash dump files. We use the MMU specific goop written at the
     84  * beginning of a crash dump by dumpsys()
     85  * Note: sun3 MMU specific!
     86  */
     87 int
     88 _kvm_initvtop(kd)
     89 	kvm_t *kd;
     90 {
     91 	register char *p;
     92 
     93 	p = kd->cpu_data;
     94 	p += (NBPG - sizeof(kcore_seg_t));
     95 	kd->vmst = (struct vmstate *)p;
     96 
     97 	return (0);
     98 }
     99 
    100 void
    101 _kvm_freevtop(kd)
    102 	kvm_t *kd;
    103 {
    104 	/* This was set by pointer arithmetic, not allocation. */
    105 	kd->vmst = (void*)0;
    106 }
    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, pap)
    116 	kvm_t *kd;
    117 	u_long va;
    118 	u_long *pap;
    119 {
    120 	register cpu_kcore_hdr_t *ckh;
    121 	u_int segnum, sme, ptenum;
    122 	int pte, offset;
    123 	u_long pa;
    124 
    125 	if (ISALIVE(kd)) {
    126 		_kvm_err(kd, 0, "vatop called in live kernel!");
    127 		return((off_t)0);
    128 	}
    129 	ckh = kd->cpu_data;
    130 
    131 	if (va < KERNBASE) {
    132 		_kvm_err(kd, 0, "not a kernel address");
    133 		return((off_t)0);
    134 	}
    135 
    136 	/*
    137 	 * Get the segmap entry (sme) from the kernel segmap.
    138 	 * Note: only have segmap entries from KERNBASE to end.
    139 	 */
    140 	segnum = VA_SEGNUM(va - KERNBASE);
    141 	ptenum = VA_PTE_NUM(va);
    142 	offset = va & PGOFSET;
    143 
    144 	/* The segmap entry selects a PMEG. */
    145 	sme = ckh->ksegmap[segnum];
    146 	pte = kd->vmst->pmeg[sme][ptenum];
    147 
    148 	if ((pte & PG_VALID) == 0) {
    149 		_kvm_err(kd, 0, "page not valid (VA=0x%x)", va);
    150 		return (0);
    151 	}
    152 	pa = PG_PA(pte) + offset;
    153 
    154 	*pap = pa;
    155 	return (NBPG - offset);
    156 }
    157 
    158 /*
    159  * Translate a physical address to a file-offset in the crash-dump.
    160  */
    161 off_t
    162 _kvm_pa2off(kd, pa)
    163 	kvm_t	*kd;
    164 	u_long	pa;
    165 {
    166 	return(kd->dump_off + pa);
    167 }
    168