kvm_i386.c revision 1.17
1 /* $NetBSD: kvm_i386.c,v 1.17 2000/06/29 06:34:24 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 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 #include <sys/cdefs.h> 41 #if defined(LIBC_SCCS) && !defined(lint) 42 #if 0 43 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 44 #else 45 __RCSID("$NetBSD: kvm_i386.c,v 1.17 2000/06/29 06:34:24 mrg Exp $"); 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 /* 50 * i386 machine dependent routines for kvm. 51 */ 52 53 #include <sys/param.h> 54 #include <sys/user.h> 55 #include <sys/proc.h> 56 #include <sys/stat.h> 57 #include <sys/kcore.h> 58 #include <machine/kcore.h> 59 #include <stdlib.h> 60 #include <unistd.h> 61 #include <nlist.h> 62 #include <kvm.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <limits.h> 67 #include <db.h> 68 69 #include "kvm_private.h" 70 71 #include <machine/pte.h> 72 73 #ifndef btop 74 #define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */ 75 #define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */ 76 #endif 77 78 void 79 _kvm_freevtop(kd) 80 kvm_t *kd; 81 { 82 83 /* Not actually used for anything right now, but safe. */ 84 if (kd->vmst != 0) 85 free(kd->vmst); 86 } 87 88 /*ARGSUSED*/ 89 int 90 _kvm_initvtop(kd) 91 kvm_t *kd; 92 { 93 94 return (0); 95 } 96 97 /* 98 * Translate a kernel virtual address to a physical address. 99 */ 100 int 101 _kvm_kvatop(kd, va, pa) 102 kvm_t *kd; 103 u_long va; 104 u_long *pa; 105 { 106 cpu_kcore_hdr_t *cpu_kh; 107 u_long page_off; 108 pd_entry_t pde; 109 pt_entry_t pte; 110 u_long pde_pa, pte_pa; 111 112 if (ISALIVE(kd)) { 113 _kvm_err(kd, 0, "vatop called in live kernel!"); 114 return (0); 115 } 116 117 cpu_kh = kd->cpu_data; 118 page_off = va & PGOFSET; 119 120 /* 121 * Find and read the page directory entry. 122 */ 123 pde_pa = cpu_kh->ptdpaddr + (pdei(va) * sizeof(pd_entry_t)); 124 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 125 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 126 _kvm_syserr(kd, 0, "could not read PDE"); 127 goto lose; 128 } 129 130 /* 131 * Find and read the page table entry. 132 */ 133 if ((pde & PG_V) == 0) { 134 _kvm_err(kd, 0, "invalid translation (invalid PDE)"); 135 goto lose; 136 } 137 pte_pa = (pde & PG_FRAME) + (ptei(va) * sizeof(pt_entry_t)); 138 if (pread(kd->pmfd, (void *) &pte, sizeof(pte), 139 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 140 _kvm_syserr(kd, 0, "could not read PTE"); 141 goto lose; 142 } 143 144 /* 145 * Validate the PTE and return the physical address. 146 */ 147 if ((pte & PG_V) == 0) { 148 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 149 goto lose; 150 } 151 *pa = (pte & PG_FRAME) + page_off; 152 return (int)(NBPG - page_off); 153 154 lose: 155 *pa = (u_long)~0L; 156 return (0); 157 } 158 159 /* 160 * Translate a physical address to a file-offset in the crash dump. 161 */ 162 off_t 163 _kvm_pa2off(kd, pa) 164 kvm_t *kd; 165 u_long pa; 166 { 167 cpu_kcore_hdr_t *cpu_kh; 168 phys_ram_seg_t *ramsegs; 169 off_t off; 170 int i; 171 172 cpu_kh = kd->cpu_data; 173 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 174 175 off = 0; 176 for (i = 0; i < cpu_kh->nmemsegs; i++) { 177 if (pa >= ramsegs[i].start && 178 (pa - ramsegs[i].start) < ramsegs[i].size) { 179 off += (pa - ramsegs[i].start); 180 break; 181 } 182 off += ramsegs[i].size; 183 } 184 185 return (kd->dump_off + off); 186 } 187 188 /* 189 * Machine-dependent initialization for ALL open kvm descriptors, 190 * not just those for a kernel crash dump. Some architectures 191 * have to deal with these NOT being constants! (i.e. m68k) 192 */ 193 int 194 _kvm_mdopen(kd) 195 kvm_t *kd; 196 { 197 198 kd->usrstack = USRSTACK; 199 kd->min_uva = VM_MIN_ADDRESS; 200 kd->max_uva = VM_MAXUSER_ADDRESS; 201 202 return (0); 203 } 204
Indexes created Mon Sep 22 05:09:51 GMT 2025