1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2006 Peter Wemm 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 /* 30 * i386 machine dependent routines for kvm and minidumps. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/endian.h> 35 #include <stdint.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <vm/vm.h> 40 #include <kvm.h> 41 42 #include "../../sys/i386/include/minidump.h" 43 44 #include <limits.h> 45 46 #include "kvm_private.h" 47 #include "kvm_i386.h" 48 49 #define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE) 50 51 struct vmstate { 52 struct minidumphdr hdr; 53 }; 54 55 static i386_pte_pae_t 56 _i386_pte_pae_get(kvm_t *kd, u_long pteindex) 57 { 58 i386_pte_pae_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); 59 60 return le64toh(*pte); 61 } 62 63 static i386_pte_t 64 _i386_pte_get(kvm_t *kd, u_long pteindex) 65 { 66 i386_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); 67 68 return le32toh(*pte); 69 } 70 71 static int 72 _i386_minidump_probe(kvm_t *kd) 73 { 74 75 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && 76 _kvm_is_minidump(kd)); 77 } 78 79 static void 80 _i386_minidump_freevtop(kvm_t *kd) 81 { 82 struct vmstate *vm = kd->vmst; 83 84 free(vm); 85 kd->vmst = NULL; 86 } 87 88 static int 89 _i386_minidump_initvtop(kvm_t *kd) 90 { 91 struct vmstate *vmst; 92 off_t off, dump_avail_off, sparse_off; 93 94 vmst = _kvm_malloc(kd, sizeof(*vmst)); 95 if (vmst == NULL) { 96 _kvm_err(kd, kd->program, "cannot allocate vm"); 97 return (-1); 98 } 99 kd->vmst = vmst; 100 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != 101 sizeof(vmst->hdr)) { 102 _kvm_err(kd, kd->program, "cannot read dump header"); 103 return (-1); 104 } 105 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { 106 _kvm_err(kd, kd->program, "not a minidump for this platform"); 107 return (-1); 108 } 109 vmst->hdr.version = le32toh(vmst->hdr.version); 110 if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) { 111 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", 112 MINIDUMP_VERSION, vmst->hdr.version); 113 return (-1); 114 } 115 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize); 116 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize); 117 vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize); 118 vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase); 119 vmst->hdr.paemode = le32toh(vmst->hdr.paemode); 120 vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ? 121 le32toh(vmst->hdr.dumpavailsize) : 0; 122 123 /* Skip header and msgbuf */ 124 dump_avail_off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize); 125 126 /* Skip dump_avail */ 127 off = dump_avail_off + i386_round_page(vmst->hdr.dumpavailsize); 128 129 sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) + 130 i386_round_page(vmst->hdr.ptesize); 131 if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off, 132 vmst->hdr.bitmapsize, off, sparse_off, I386_PAGE_SIZE) == -1) { 133 return (-1); 134 } 135 off += i386_round_page(vmst->hdr.bitmapsize); 136 137 if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) { 138 return (-1); 139 } 140 off += i386_round_page(vmst->hdr.ptesize); 141 142 return (0); 143 } 144 145 static int 146 _i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) 147 { 148 struct vmstate *vm; 149 i386_physaddr_pae_t offset; 150 i386_pte_pae_t pte; 151 kvaddr_t pteindex; 152 i386_physaddr_pae_t a; 153 off_t ofs; 154 155 vm = kd->vmst; 156 offset = va & I386_PAGE_MASK; 157 158 if (va >= vm->hdr.kernbase) { 159 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 160 if (pteindex >= vm->hdr.ptesize / sizeof(pte)) 161 goto invalid; 162 pte = _i386_pte_pae_get(kd, pteindex); 163 if ((pte & I386_PG_V) == 0) { 164 _kvm_err(kd, kd->program, 165 "_i386_minidump_vatop_pae: pte not valid"); 166 goto invalid; 167 } 168 a = pte & I386_PG_FRAME_PAE; 169 ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); 170 if (ofs == -1) { 171 _kvm_err(kd, kd->program, 172 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump", 173 (uintmax_t)a); 174 goto invalid; 175 } 176 *pa = ofs + offset; 177 return (I386_PAGE_SIZE - offset); 178 } else { 179 _kvm_err(kd, kd->program, 180 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped", 181 (uintmax_t)va); 182 goto invalid; 183 } 184 185 invalid: 186 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 187 return (0); 188 } 189 190 static int 191 _i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 192 { 193 struct vmstate *vm; 194 i386_physaddr_t offset; 195 i386_pte_t pte; 196 kvaddr_t pteindex; 197 i386_physaddr_t a; 198 off_t ofs; 199 200 vm = kd->vmst; 201 offset = va & I386_PAGE_MASK; 202 203 if (va >= vm->hdr.kernbase) { 204 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 205 if (pteindex >= vm->hdr.ptesize / sizeof(pte)) 206 goto invalid; 207 pte = _i386_pte_get(kd, pteindex); 208 if ((pte & I386_PG_V) == 0) { 209 _kvm_err(kd, kd->program, 210 "_i386_minidump_vatop: pte not valid"); 211 goto invalid; 212 } 213 a = pte & I386_PG_FRAME; 214 ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); 215 if (ofs == -1) { 216 _kvm_err(kd, kd->program, 217 "_i386_minidump_vatop: physical address 0x%jx not in minidump", 218 (uintmax_t)a); 219 goto invalid; 220 } 221 *pa = ofs + offset; 222 return (I386_PAGE_SIZE - offset); 223 } else { 224 _kvm_err(kd, kd->program, 225 "_i386_minidump_vatop: virtual address 0x%jx not minidumped", 226 (uintmax_t)va); 227 goto invalid; 228 } 229 230 invalid: 231 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 232 return (0); 233 } 234 235 static int 236 _i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 237 { 238 239 if (ISALIVE(kd)) { 240 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!"); 241 return (0); 242 } 243 if (kd->vmst->hdr.paemode) 244 return (_i386_minidump_vatop_pae(kd, va, pa)); 245 else 246 return (_i386_minidump_vatop(kd, va, pa)); 247 } 248 249 static vm_prot_t 250 _i386_entry_to_prot(uint64_t pte) 251 { 252 vm_prot_t prot = VM_PROT_READ; 253 254 /* Source: i386/pmap.c:pmap_protect() */ 255 if (pte & I386_PG_RW) 256 prot |= VM_PROT_WRITE; 257 if ((pte & I386_PG_NX) == 0) 258 prot |= VM_PROT_EXECUTE; 259 260 return prot; 261 } 262 263 struct i386_iter { 264 kvm_t *kd; 265 u_long nptes; 266 u_long pteindex; 267 }; 268 269 static void 270 _i386_iterator_init(struct i386_iter *it, kvm_t *kd) 271 { 272 struct vmstate *vm = kd->vmst; 273 274 it->kd = kd; 275 it->pteindex = 0; 276 if (vm->hdr.paemode) { 277 it->nptes = vm->hdr.ptesize / sizeof(i386_pte_pae_t); 278 } else { 279 it->nptes = vm->hdr.ptesize / sizeof(i386_pte_t); 280 } 281 return; 282 } 283 284 static int 285 _i386_iterator_next(struct i386_iter *it, u_long *pa, u_long *va, u_long *dva, 286 vm_prot_t *prot) 287 { 288 struct vmstate *vm = it->kd->vmst; 289 i386_pte_t pte32; 290 i386_pte_pae_t pte64; 291 int found = 0; 292 293 *dva = 0; 294 *pa = 0; 295 *va = 0; 296 *dva = 0; 297 *prot = 0; 298 for (; it->pteindex < it->nptes && found == 0; it->pteindex++) { 299 if (vm->hdr.paemode) { 300 pte64 = _i386_pte_pae_get(it->kd, it->pteindex); 301 if ((pte64 & I386_PG_V) == 0) 302 continue; 303 *prot = _i386_entry_to_prot(pte64); 304 *pa = pte64 & I386_PG_FRAME_PAE; 305 } else { 306 pte32 = _i386_pte_get(it->kd, it->pteindex); 307 if ((pte32 & I386_PG_V) == 0) 308 continue; 309 *prot = _i386_entry_to_prot(pte32); 310 *pa = pte32 & I386_PG_FRAME; 311 } 312 *va = vm->hdr.kernbase + (it->pteindex << I386_PAGE_SHIFT); 313 found = 1; 314 } 315 return found; 316 } 317 318 static int 319 _i386_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 320 { 321 struct i386_iter it; 322 u_long dva, pa, va; 323 vm_prot_t prot; 324 325 _i386_iterator_init(&it, kd); 326 while (_i386_iterator_next(&it, &pa, &va, &dva, &prot)) { 327 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva, 328 prot, I386_PAGE_SIZE, 0)) { 329 return (0); 330 } 331 } 332 return (1); 333 } 334 335 static struct kvm_arch kvm_i386_minidump = { 336 .ka_probe = _i386_minidump_probe, 337 .ka_initvtop = _i386_minidump_initvtop, 338 .ka_freevtop = _i386_minidump_freevtop, 339 .ka_kvatop = _i386_minidump_kvatop, 340 .ka_native = _i386_native, 341 .ka_walk_pages = _i386_minidump_walk_pages, 342 }; 343 344 KVM_ARCH(kvm_i386_minidump); 345