/* $OpenBSD: kvm_i386.c,v 1.13 2004/07/01 02:04:10 mickey Exp $ */ /* $NetBSD: kvm_i386.c,v 1.9 1996/03/18 22:33:38 thorpej Exp $ */ /*- * Copyright (c) 1989, 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software developed by the Computer Systems * Engineering group at Lawrence Berkeley Laboratory under DARPA contract * BG 91-66 and contributed to Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; #else static char *rcsid = "$OpenBSD: kvm_i386.c,v 1.13 2004/07/01 02:04:10 mickey Exp $"; #endif #endif /* LIBC_SCCS and not lint */ /* * i386 machine dependent routines for kvm. Hopefully, the forthcoming * vm code will one day obsolete this module. */ #include <sys/param.h> #include <sys/user.h> #include <sys/proc.h> #include <sys/stat.h> #include <stdlib.h> #include <unistd.h> #include <nlist.h> #include <kvm.h> #include <uvm/uvm_extern.h> #include <machine/vmparam.h> #include <machine/pmap.h> #include <limits.h> #include <db.h> #include "kvm_private.h" #include <machine/pte.h> struct vmstate { pd_entry_t *PTD; }; void _kvm_freevtop(kvm_t *kd) { if (kd->vmst != NULL) { if (kd->vmst->PTD != NULL) free(kd->vmst->PTD); free(kd->vmst); kd->vmst = NULL; } } int _kvm_initvtop(kvm_t *kd) { struct nlist nlist[2]; struct vmstate *vm; u_long pa; vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); if (vm == 0) return (-1); kd->vmst = vm; nlist[0].n_name = "_PTDpaddr"; nlist[1].n_name = 0; if (kvm_nlist(kd, nlist) != 0) { _kvm_err(kd, kd->program, "bad namelist"); return (-1); } vm->PTD = 0; if (_kvm_pread(kd, kd->pmfd, &pa, sizeof pa, (off_t)_kvm_pa2off(kd, nlist[0].n_value - KERNBASE)) != sizeof pa) goto invalid; vm->PTD = (pd_entry_t *)_kvm_malloc(kd, NBPG); if (_kvm_pread(kd, kd->pmfd, vm->PTD, NBPG, (off_t)_kvm_pa2off(kd, pa)) != NBPG) goto invalid; return (0); invalid: if (vm->PTD != 0) free(vm->PTD); return (-1); } /* * Translate a kernel virtual address to a physical address. */ int _kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) { u_long offset, pte_pa; struct vmstate *vm; pt_entry_t pte; if (!kd->vmst) { _kvm_err(kd, 0, "vatop called before initvtop"); return (0); } if (ISALIVE(kd)) { _kvm_err(kd, 0, "vatop called in live kernel!"); return (0); } vm = kd->vmst; offset = va & PGOFSET; /* * If we are initializing (kernel page table descriptor pointer * not yet set) * then return pa == va to avoid infinite recursion. */ if (vm->PTD == 0) { *pa = va; return (NBPG - offset); } if ((vm->PTD[pdei(va)] & PG_V) == 0) goto invalid; pte_pa = (vm->PTD[pdei(va)] & PG_FRAME) + (ptei(va) * sizeof(pt_entry_t)); /* XXX READ PHYSICAL XXX */ if (_kvm_pread(kd, kd->pmfd, &pte, sizeof pte, (off_t)_kvm_pa2off(kd, pte_pa)) != sizeof pte) goto invalid; *pa = (pte & PG_FRAME) + offset; return (NBPG - offset); invalid: _kvm_err(kd, 0, "invalid address (%lx)", va); return (0); } /* * Translate a physical address to a file-offset in the crash-dump. */ off_t _kvm_pa2off(kvm_t *kd, u_long pa) { return ((off_t)(kd->dump_off + pa)); }