1 /* $NetBSD: kvm_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl 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_x86_64.c,v 1.3 2002/06/05 22:01:55 fvdl Exp $"); 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 /* 50 * x86-64 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/pmap.h> 72 #include <machine/pte.h> 73 #include <machine/vmparam.h> 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 paddr_t 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 all entries to get to the pa. 119 */ 120 121 /* 122 * Level 4. 123 */ 124 pde_pa = cpu_kh->ptdpaddr + (pl4_i(va) * sizeof(pd_entry_t)); 125 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 126 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 127 _kvm_syserr(kd, 0, "could not read PT level 4 entry"); 128 goto lose; 129 } 130 if ((pde & PG_V) == 0) { 131 _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)"); 132 goto lose; 133 } 134 135 /* 136 * Level 3. 137 */ 138 pde_pa = (pde_pa + PG_FRAME) + (pl3_i(va) * sizeof(pd_entry_t)); 139 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 140 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 141 _kvm_syserr(kd, 0, "could not read PT level 3 entry"); 142 goto lose; 143 } 144 if ((pde & PG_V) == 0) { 145 _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)"); 146 goto lose; 147 } 148 149 /* 150 * Level 2. 151 */ 152 pde_pa = (pde_pa & PG_FRAME) + (pl2_i(va) * sizeof(pd_entry_t)); 153 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 154 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 155 _kvm_syserr(kd, 0, "could not read PT level 2 entry"); 156 goto lose; 157 } 158 if ((pde & PG_V) == 0) { 159 _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)"); 160 goto lose; 161 } 162 163 164 /* 165 * Level 1. 166 */ 167 pte_pa = (pde_pa & PG_FRAME) + (pl1_i(va) * sizeof(pt_entry_t)); 168 if (pread(kd->pmfd, (void *) &pte, sizeof(pte), 169 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 170 _kvm_syserr(kd, 0, "could not read PTE"); 171 goto lose; 172 } 173 /* 174 * Validate the PTE and return the physical address. 175 */ 176 if ((pte & PG_V) == 0) { 177 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 178 goto lose; 179 } 180 *pa = (pte & PG_FRAME) + page_off; 181 return (int)(NBPG - page_off); 182 183 lose: 184 *pa = (u_long)~0L; 185 return (0); 186 } 187 188 /* 189 * Translate a physical address to a file-offset in the crash dump. 190 */ 191 off_t 192 _kvm_pa2off(kd, pa) 193 kvm_t *kd; 194 u_long pa; 195 { 196 cpu_kcore_hdr_t *cpu_kh; 197 phys_ram_seg_t *ramsegs; 198 off_t off; 199 int i; 200 201 cpu_kh = kd->cpu_data; 202 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 203 204 off = 0; 205 for (i = 0; i < cpu_kh->nmemsegs; i++) { 206 if (pa >= ramsegs[i].start && 207 (pa - ramsegs[i].start) < ramsegs[i].size) { 208 off += (pa - ramsegs[i].start); 209 break; 210 } 211 off += ramsegs[i].size; 212 } 213 214 return (kd->dump_off + off); 215 } 216 217 /* 218 * Machine-dependent initialization for ALL open kvm descriptors, 219 * not just those for a kernel crash dump. Some architectures 220 * have to deal with these NOT being constants! (i.e. m68k) 221 */ 222 int 223 _kvm_mdopen(kd) 224 kvm_t *kd; 225 { 226 227 kd->usrstack = USRSTACK; 228 kd->min_uva = VM_MIN_ADDRESS; 229 kd->max_uva = VM_MAXUSER_ADDRESS; 230 231 return (0); 232 } 233