1 /* $OpenBSD: kvm_amd64.c,v 1.11 2013/11/01 15:57:56 deraadt Exp $ */ 2 /* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $ */ 3 4 /*- 5 * Copyright (c) 1989, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software developed by the Computer Systems 9 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 10 * BG 91-66 and contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 /* 38 * x86-64 machine dependent routines for kvm. 39 */ 40 41 #include <sys/param.h> 42 #include <sys/proc.h> 43 #include <sys/stat.h> 44 #include <sys/kcore.h> 45 #include <machine/kcore.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 #include <nlist.h> 49 #include <kvm.h> 50 51 #include <uvm/uvm_extern.h> 52 53 #include <limits.h> 54 #include <db.h> 55 56 #include "kvm_private.h" 57 58 #include <machine/pmap.h> 59 #include <machine/pte.h> 60 #include <machine/vmparam.h> 61 62 void 63 _kvm_freevtop(kvm_t *kd) 64 { 65 66 /* Not actually used for anything right now, but safe. */ 67 if (kd->vmst != NULL) { 68 free(kd->vmst); 69 kd->vmst = NULL; 70 } 71 } 72 73 /*ARGSUSED*/ 74 int 75 _kvm_initvtop(kvm_t *kd) 76 { 77 78 return (0); 79 } 80 81 /* 82 * Translate a kernel virtual address to a physical address. 83 */ 84 int 85 _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa) 86 { 87 cpu_kcore_hdr_t *cpu_kh; 88 paddr_t pde_pa, pte_pa; 89 u_long page_off; 90 pd_entry_t pde; 91 pt_entry_t pte; 92 93 if (ISALIVE(kd)) { 94 _kvm_err(kd, 0, "vatop called in live kernel!"); 95 return (0); 96 } 97 98 page_off = va & (kd->nbpg - 1); 99 100 if (va >= PMAP_DIRECT_BASE && va <= PMAP_DIRECT_END) { 101 *pa = va - PMAP_DIRECT_BASE; 102 return (int)(kd->nbpg - page_off); 103 } 104 105 cpu_kh = kd->cpu_data; 106 107 /* 108 * Find and read all entries to get to the pa. 109 */ 110 111 /* 112 * Level 4. 113 */ 114 pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t)); 115 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 116 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 117 _kvm_syserr(kd, 0, "could not read PT level 4 entry"); 118 goto lose; 119 } 120 if ((pde & PG_V) == 0) { 121 _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)"); 122 goto lose; 123 } 124 125 /* 126 * Level 3. 127 */ 128 pde_pa = (pde & PG_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t)); 129 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 130 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 131 _kvm_syserr(kd, 0, "could not read PT level 3 entry"); 132 goto lose; 133 } 134 if ((pde & PG_V) == 0) { 135 _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)"); 136 goto lose; 137 } 138 139 /* 140 * Level 2. 141 */ 142 pde_pa = (pde & PG_FRAME) + (pl2_pi(va) * sizeof(pd_entry_t)); 143 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 144 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 145 _kvm_syserr(kd, 0, "could not read PT level 2 entry"); 146 goto lose; 147 } 148 if ((pde & PG_V) == 0) { 149 _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)"); 150 goto lose; 151 } 152 153 /* 154 * Might be a large page. 155 */ 156 if ((pde & PG_PS) != 0) { 157 page_off = va & (NBPD_L2 - 1); 158 *pa = (pde & PG_LGFRAME) | page_off; 159 return (int)(NBPD_L2 - page_off); 160 } 161 162 /* 163 * Level 1. 164 */ 165 pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t)); 166 if (pread(kd->pmfd, (void *) &pte, sizeof(pte), 167 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 168 _kvm_syserr(kd, 0, "could not read PTE"); 169 goto lose; 170 } 171 /* 172 * Validate the PTE and return the physical address. 173 */ 174 if ((pte & PG_V) == 0) { 175 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 176 goto lose; 177 } 178 *pa = (pte & PG_FRAME) + page_off; 179 return (int)(kd->nbpg - page_off); 180 181 lose: 182 *pa = (u_long)~0L; 183 return (0); 184 } 185 186 /* 187 * Translate a physical address to a file-offset in the crash dump. 188 */ 189 off_t 190 _kvm_pa2off(kvm_t *kd, paddr_t 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 if (i == cpu_kh->nmemsegs) 211 _kvm_err(kd, 0, "pa %lx not in dump", pa); 212 213 return (kd->dump_off + off); 214 } 215