1 /* $NetBSD: kvm_x86_64.c,v 1.6 2008/01/15 13:57:42 ad 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_x86_64.c,v 1.6 2008/01/15 13:57:42 ad Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * x86-64 machine dependent routines for kvm. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/user.h> 51 #include <sys/proc.h> 52 #include <sys/stat.h> 53 #include <sys/kcore.h> 54 #include <machine/kcore.h> 55 #include <stdlib.h> 56 #include <unistd.h> 57 #include <nlist.h> 58 #include <kvm.h> 59 60 #include <uvm/uvm_extern.h> 61 62 #include <limits.h> 63 #include <db.h> 64 65 #include "kvm_private.h" 66 67 #include <machine/pmap.h> 68 #include <machine/pte.h> 69 #include <machine/vmparam.h> 70 71 void 72 _kvm_freevtop(kd) 73 kvm_t *kd; 74 { 75 76 /* Not actually used for anything right now, but safe. */ 77 if (kd->vmst != 0) 78 free(kd->vmst); 79 } 80 81 /*ARGSUSED*/ 82 int 83 _kvm_initvtop(kd) 84 kvm_t *kd; 85 { 86 87 return (0); 88 } 89 90 /* 91 * Translate a kernel virtual address to a physical address. 92 */ 93 int 94 _kvm_kvatop(kd, va, pa) 95 kvm_t *kd; 96 u_long va; 97 u_long *pa; 98 { 99 cpu_kcore_hdr_t *cpu_kh; 100 u_long page_off; 101 pd_entry_t pde; 102 pt_entry_t pte; 103 paddr_t pde_pa, pte_pa; 104 105 if (ISALIVE(kd)) { 106 _kvm_err(kd, 0, "vatop called in live kernel!"); 107 return (0); 108 } 109 110 cpu_kh = kd->cpu_data; 111 page_off = va & PGOFSET; 112 113 /* 114 * Find and read all entries to get to the pa. 115 */ 116 117 /* 118 * Level 4. 119 */ 120 pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t)); 121 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 122 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 123 _kvm_syserr(kd, 0, "could not read PT level 4 entry"); 124 goto lose; 125 } 126 if ((pde & PG_V) == 0) { 127 _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)"); 128 goto lose; 129 } 130 131 /* 132 * Level 3. 133 */ 134 pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t)); 135 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 136 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 137 _kvm_syserr(kd, 0, "could not read PT level 3 entry"); 138 goto lose; 139 } 140 if ((pde & PG_V) == 0) { 141 _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)"); 142 goto lose; 143 } 144 145 /* 146 * Level 2. 147 */ 148 pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t)); 149 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 150 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 151 _kvm_syserr(kd, 0, "could not read PT level 2 entry"); 152 goto lose; 153 } 154 if ((pde & PG_V) == 0) { 155 _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)"); 156 goto lose; 157 } 158 159 160 /* 161 * Level 1. 162 */ 163 pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t)); 164 if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte), 165 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 166 _kvm_syserr(kd, 0, "could not read PTE"); 167 goto lose; 168 } 169 /* 170 * Validate the PTE and return the physical address. 171 */ 172 if ((pte & PG_V) == 0) { 173 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 174 goto lose; 175 } 176 *pa = (pte & PG_FRAME) + page_off; 177 return (int)(NBPG - page_off); 178 179 lose: 180 *pa = (u_long)~0L; 181 return (0); 182 } 183 184 /* 185 * Translate a physical address to a file-offset in the crash dump. 186 */ 187 off_t 188 _kvm_pa2off(kd, pa) 189 kvm_t *kd; 190 u_long pa; 191 { 192 cpu_kcore_hdr_t *cpu_kh; 193 phys_ram_seg_t *ramsegs; 194 off_t off; 195 int i; 196 197 cpu_kh = kd->cpu_data; 198 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 199 200 off = 0; 201 for (i = 0; i < cpu_kh->nmemsegs; i++) { 202 if (pa >= ramsegs[i].start && 203 (pa - ramsegs[i].start) < ramsegs[i].size) { 204 off += (pa - ramsegs[i].start); 205 break; 206 } 207 off += ramsegs[i].size; 208 } 209 210 return (kd->dump_off + off); 211 } 212 213 /* 214 * Machine-dependent initialization for ALL open kvm descriptors, 215 * not just those for a kernel crash dump. Some architectures 216 * have to deal with these NOT being constants! (i.e. m68k) 217 */ 218 int 219 _kvm_mdopen(kd) 220 kvm_t *kd; 221 { 222 223 kd->usrstack = USRSTACK; 224 kd->min_uva = VM_MIN_ADDRESS; 225 kd->max_uva = VM_MAXUSER_ADDRESS; 226 227 return (0); 228 } 229