1 /* $NetBSD: kvm_i386.c,v 1.21 2004/08/27 01:13:31 thorpej 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. 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 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: kvm_i386.c,v 1.21 2004/08/27 01:13:31 thorpej Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * i386 machine dependent routines for kvm. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/user.h> 51 #include <sys/stat.h> 52 #include <sys/kcore.h> 53 #include <machine/kcore.h> 54 #include <stdlib.h> 55 #include <unistd.h> 56 #include <nlist.h> 57 #include <kvm.h> 58 59 #include <uvm/uvm_extern.h> 60 61 #include <limits.h> 62 #include <db.h> 63 64 #include "kvm_private.h" 65 66 #include <machine/pmap.h> 67 #include <machine/pte.h> 68 #include <machine/vmparam.h> 69 70 #ifndef btop 71 #define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */ 72 #define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */ 73 #endif 74 75 void 76 _kvm_freevtop(kd) 77 kvm_t *kd; 78 { 79 80 /* Not actually used for anything right now, but safe. */ 81 if (kd->vmst != 0) 82 free(kd->vmst); 83 } 84 85 /*ARGSUSED*/ 86 int 87 _kvm_initvtop(kd) 88 kvm_t *kd; 89 { 90 91 return (0); 92 } 93 94 /* 95 * Translate a kernel virtual address to a physical address. 96 */ 97 int 98 _kvm_kvatop(kd, va, pa) 99 kvm_t *kd; 100 u_long va; 101 u_long *pa; 102 { 103 cpu_kcore_hdr_t *cpu_kh; 104 u_long page_off; 105 pd_entry_t pde; 106 pt_entry_t pte; 107 u_long pde_pa, pte_pa; 108 109 if (ISALIVE(kd)) { 110 _kvm_err(kd, 0, "vatop called in live kernel!"); 111 return (0); 112 } 113 114 cpu_kh = kd->cpu_data; 115 page_off = va & PGOFSET; 116 117 /* 118 * Find and read the page directory entry. 119 */ 120 pde_pa = cpu_kh->pdppaddr + (pdei(va) * sizeof(pd_entry_t)); 121 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 122 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 123 _kvm_syserr(kd, 0, "could not read PDE"); 124 goto lose; 125 } 126 127 /* 128 * Find and read the page table entry. 129 */ 130 if ((pde & PG_V) == 0) { 131 _kvm_err(kd, 0, "invalid translation (invalid PDE)"); 132 goto lose; 133 } 134 pte_pa = (pde & PG_FRAME) + (ptei(va) * sizeof(pt_entry_t)); 135 if (pread(kd->pmfd, (void *) &pte, sizeof(pte), 136 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 137 _kvm_syserr(kd, 0, "could not read PTE"); 138 goto lose; 139 } 140 141 /* 142 * Validate the PTE and return the physical address. 143 */ 144 if ((pte & PG_V) == 0) { 145 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 146 goto lose; 147 } 148 *pa = (pte & PG_FRAME) + page_off; 149 return (int)(NBPG - page_off); 150 151 lose: 152 *pa = (u_long)~0L; 153 return (0); 154 } 155 156 /* 157 * Translate a physical address to a file-offset in the crash dump. 158 */ 159 off_t 160 _kvm_pa2off(kd, pa) 161 kvm_t *kd; 162 u_long pa; 163 { 164 cpu_kcore_hdr_t *cpu_kh; 165 phys_ram_seg_t *ramsegs; 166 off_t off; 167 int i; 168 169 cpu_kh = kd->cpu_data; 170 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 171 172 off = 0; 173 for (i = 0; i < cpu_kh->nmemsegs; i++) { 174 if (pa >= ramsegs[i].start && 175 (pa - ramsegs[i].start) < ramsegs[i].size) { 176 off += (pa - ramsegs[i].start); 177 break; 178 } 179 off += ramsegs[i].size; 180 } 181 182 return (kd->dump_off + off); 183 } 184 185 /* 186 * Machine-dependent initialization for ALL open kvm descriptors, 187 * not just those for a kernel crash dump. Some architectures 188 * have to deal with these NOT being constants! (i.e. m68k) 189 */ 190 int 191 _kvm_mdopen(kd) 192 kvm_t *kd; 193 { 194 195 kd->usrstack = USRSTACK; 196 kd->min_uva = VM_MIN_ADDRESS; 197 kd->max_uva = VM_MAXUSER_ADDRESS; 198 199 return (0); 200 } 201