1 /* $NetBSD: kvm_x86_64.c,v 1.13 2022/01/10 19:51:30 christos 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 1.13 2022/01/10 19:51:30 christos 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/proc.h> 51 #include <sys/stat.h> 52 #include <sys/kcore.h> 53 #include <sys/types.h> 54 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/kcore.h> 68 #include <machine/pmap.h> 69 #include <machine/pte.h> 70 #include <machine/vmparam.h> 71 72 void 73 _kvm_freevtop(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(kvm_t *kd) 84 { 85 86 return (0); 87 } 88 89 /* 90 * Translate a kernel virtual address to a physical address. 91 */ 92 int 93 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa) 94 { 95 cpu_kcore_hdr_t *cpu_kh; 96 u_long page_off; 97 pd_entry_t pde; 98 pt_entry_t pte; 99 paddr_t pde_pa, pte_pa; 100 101 if (ISALIVE(kd)) { 102 _kvm_err(kd, 0, "vatop called in live kernel!"); 103 return (0); 104 } 105 106 cpu_kh = kd->cpu_data; 107 108 /* 109 * Find and read all entries to get to the pa. 110 */ 111 112 /* 113 * Level 4. 114 */ 115 pde_pa = cpu_kh->ptdpaddr + (pl4_pi(va) * sizeof(pd_entry_t)); 116 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 117 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 118 _kvm_syserr(kd, 0, "could not read PT level 4 entry"); 119 goto lose; 120 } 121 if ((pde & PTE_P) == 0) { 122 _kvm_err(kd, 0, "invalid translation (invalid level 4 PDE)"); 123 goto lose; 124 } 125 126 /* 127 * Level 3. 128 */ 129 pde_pa = (pde & PTE_FRAME) + (pl3_pi(va) * sizeof(pd_entry_t)); 130 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 131 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 132 _kvm_syserr(kd, 0, "could not read PT level 3 entry"); 133 goto lose; 134 } 135 if ((pde & PTE_P) == 0) { 136 _kvm_err(kd, 0, "invalid translation (invalid level 3 PDE)"); 137 goto lose; 138 } 139 if (pde & PTE_PS) { 140 page_off = va & (NBPD_L3 - 1); 141 *pa = (pde & PTE_1GFRAME) + page_off; 142 return (int)(NBPD_L3 - page_off); 143 } 144 145 /* 146 * Level 2. 147 */ 148 pde_pa = (pde & PTE_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 & PTE_P) == 0) { 155 _kvm_err(kd, 0, "invalid translation (invalid level 2 PDE)"); 156 goto lose; 157 } 158 if (pde & PTE_PS) { 159 page_off = va & (NBPD_L2 - 1); 160 *pa = (pde & PTE_2MFRAME) + page_off; 161 return (int)(NBPD_L2 - page_off); 162 } 163 164 /* 165 * Level 1. 166 */ 167 pte_pa = (pde & PTE_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t)); 168 if (_kvm_pread(kd, 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 & PTE_P) == 0) { 177 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 178 goto lose; 179 } 180 page_off = va & PGOFSET; 181 *pa = (pte & PTE_FRAME) + page_off; 182 return (int)(NBPG - page_off); 183 184 lose: 185 *pa = (u_long)~0L; 186 return (0); 187 } 188 189 struct p2o { 190 paddr_t pa; 191 psize_t sz; 192 off_t off; 193 }; 194 195 static int 196 cmp_p2o(const void *a, const void *b) 197 { 198 const struct p2o *p1 = a; 199 const struct p2o *p2 = b; 200 201 /* If one range contains the start of the other, it's a match. */ 202 if (p1->pa >= p2->pa && p1->pa < p2->pa + p2->sz) { 203 return 0; 204 } 205 if (p2->pa >= p1->pa && p2->pa < p1->pa + p1->sz) { 206 return 0; 207 } 208 209 /* Otherwise sort by pa. */ 210 if (p1->pa < p2->pa) 211 return -1; 212 else if (p1->pa > p2->pa) 213 return 1; 214 else 215 return 0; 216 } 217 218 219 /* 220 * Translate a physical address to a file-offset in the crash dump. 221 */ 222 off_t 223 _kvm_pa2off(kvm_t *kd, paddr_t pa) 224 { 225 cpu_kcore_hdr_t *cpu_kh; 226 phys_ram_seg_t *ramsegs; 227 off_t off; 228 int i; 229 230 static struct p2o *map; 231 struct p2o key, *val; 232 233 cpu_kh = kd->cpu_data; 234 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 235 236 if (map == NULL) { 237 map = calloc(sizeof *map, cpu_kh->nmemsegs); 238 off = 0; 239 for (i = 0; i < cpu_kh->nmemsegs; i++) { 240 map[i].pa = ramsegs[i].start; 241 map[i].sz = ramsegs[i].size; 242 map[i].off = off; 243 off += ramsegs[i].size; 244 } 245 #if 0 246 /* The array appears to be sorted already */ 247 qsort(map, cpu_kh->nmemsegs, sizeof(*map), cmp_p2o); 248 #endif 249 } 250 251 key.pa = pa; 252 key.sz = 1; 253 key.off = -1; 254 val = bsearch(&key, map, cpu_kh->nmemsegs, sizeof (key), cmp_p2o); 255 if (val) 256 off = val->off + pa - val->pa; 257 else 258 off = 0; 259 260 return (kd->dump_off + off); 261 } 262 263 /* 264 * Machine-dependent initialization for ALL open kvm descriptors, 265 * not just those for a kernel crash dump. Some architectures 266 * have to deal with these NOT being constants! (i.e. m68k) 267 */ 268 int 269 _kvm_mdopen(kvm_t *kd) 270 { 271 272 kd->min_uva = VM_MIN_ADDRESS; 273 kd->max_uva = VM_MAXUSER_ADDRESS; 274 275 return (0); 276 } 277
Indexes created Sun Sep 21 15:09:59 GMT 2025