1 /*- 2 * Copyright (c) 2006 Peter Wemm 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 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, 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) { 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); 120 121 /* Skip header and msgbuf */ 122 off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize); 123 124 sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) + 125 i386_round_page(vmst->hdr.ptesize); 126 if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off, 127 I386_PAGE_SIZE, sizeof(uint32_t)) == -1) { 128 return (-1); 129 } 130 off += i386_round_page(vmst->hdr.bitmapsize); 131 132 if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) { 133 return (-1); 134 } 135 off += i386_round_page(vmst->hdr.ptesize); 136 137 return (0); 138 } 139 140 static int 141 _i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) 142 { 143 struct vmstate *vm; 144 i386_physaddr_pae_t offset; 145 i386_pte_pae_t pte; 146 kvaddr_t pteindex; 147 i386_physaddr_pae_t a; 148 off_t ofs; 149 150 vm = kd->vmst; 151 offset = va & I386_PAGE_MASK; 152 153 if (va >= vm->hdr.kernbase) { 154 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 155 if (pteindex >= vm->hdr.ptesize / sizeof(pte)) 156 goto invalid; 157 pte = _i386_pte_pae_get(kd, pteindex); 158 if ((pte & I386_PG_V) == 0) { 159 _kvm_err(kd, kd->program, 160 "_i386_minidump_vatop_pae: pte not valid"); 161 goto invalid; 162 } 163 a = pte & I386_PG_FRAME_PAE; 164 ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); 165 if (ofs == -1) { 166 _kvm_err(kd, kd->program, 167 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump", 168 (uintmax_t)a); 169 goto invalid; 170 } 171 *pa = ofs + offset; 172 return (I386_PAGE_SIZE - offset); 173 } else { 174 _kvm_err(kd, kd->program, 175 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped", 176 (uintmax_t)va); 177 goto invalid; 178 } 179 180 invalid: 181 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 182 return (0); 183 } 184 185 static int 186 _i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 187 { 188 struct vmstate *vm; 189 i386_physaddr_t offset; 190 i386_pte_t pte; 191 kvaddr_t pteindex; 192 i386_physaddr_t a; 193 off_t ofs; 194 195 vm = kd->vmst; 196 offset = va & I386_PAGE_MASK; 197 198 if (va >= vm->hdr.kernbase) { 199 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 200 if (pteindex >= vm->hdr.ptesize / sizeof(pte)) 201 goto invalid; 202 pte = _i386_pte_get(kd, pteindex); 203 if ((pte & I386_PG_V) == 0) { 204 _kvm_err(kd, kd->program, 205 "_i386_minidump_vatop: pte not valid"); 206 goto invalid; 207 } 208 a = pte & I386_PG_FRAME; 209 ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); 210 if (ofs == -1) { 211 _kvm_err(kd, kd->program, 212 "_i386_minidump_vatop: physical address 0x%jx not in minidump", 213 (uintmax_t)a); 214 goto invalid; 215 } 216 *pa = ofs + offset; 217 return (I386_PAGE_SIZE - offset); 218 } else { 219 _kvm_err(kd, kd->program, 220 "_i386_minidump_vatop: virtual address 0x%jx not minidumped", 221 (uintmax_t)va); 222 goto invalid; 223 } 224 225 invalid: 226 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 227 return (0); 228 } 229 230 static int 231 _i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 232 { 233 234 if (ISALIVE(kd)) { 235 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!"); 236 return (0); 237 } 238 if (kd->vmst->hdr.paemode) 239 return (_i386_minidump_vatop_pae(kd, va, pa)); 240 else 241 return (_i386_minidump_vatop(kd, va, pa)); 242 } 243 244 static vm_prot_t 245 _i386_entry_to_prot(uint64_t pte) 246 { 247 vm_prot_t prot = VM_PROT_READ; 248 249 /* Source: i386/pmap.c:pmap_protect() */ 250 if (pte & I386_PG_RW) 251 prot |= VM_PROT_WRITE; 252 if ((pte & I386_PG_NX) == 0) 253 prot |= VM_PROT_EXECUTE; 254 255 return prot; 256 } 257 258 struct i386_iter { 259 kvm_t *kd; 260 u_long nptes; 261 u_long pteindex; 262 }; 263 264 static void 265 _i386_iterator_init(struct i386_iter *it, kvm_t *kd) 266 { 267 struct vmstate *vm = kd->vmst; 268 269 it->kd = kd; 270 it->pteindex = 0; 271 if (vm->hdr.paemode) { 272 it->nptes = vm->hdr.ptesize / sizeof(i386_pte_pae_t); 273 } else { 274 it->nptes = vm->hdr.ptesize / sizeof(i386_pte_t); 275 } 276 return; 277 } 278 279 static int 280 _i386_iterator_next(struct i386_iter *it, u_long *pa, u_long *va, u_long *dva, 281 vm_prot_t *prot) 282 { 283 struct vmstate *vm = it->kd->vmst; 284 i386_pte_t pte32; 285 i386_pte_pae_t pte64; 286 int found = 0; 287 288 *dva = 0; 289 *pa = 0; 290 *va = 0; 291 *dva = 0; 292 *prot = 0; 293 for (; it->pteindex < it->nptes && found == 0; it->pteindex++) { 294 if (vm->hdr.paemode) { 295 pte64 = _i386_pte_pae_get(it->kd, it->pteindex); 296 if ((pte64 & I386_PG_V) == 0) 297 continue; 298 *prot = _i386_entry_to_prot(pte64); 299 *pa = pte64 & I386_PG_FRAME_PAE; 300 } else { 301 pte32 = _i386_pte_get(it->kd, it->pteindex); 302 if ((pte32 & I386_PG_V) == 0) 303 continue; 304 *prot = _i386_entry_to_prot(pte32); 305 *pa = pte32 & I386_PG_FRAME; 306 } 307 *va = vm->hdr.kernbase + (it->pteindex << I386_PAGE_SHIFT); 308 found = 1; 309 } 310 return found; 311 } 312 313 static int 314 _i386_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 315 { 316 struct i386_iter it; 317 u_long dva, pa, va; 318 vm_prot_t prot; 319 320 _i386_iterator_init(&it, kd); 321 while (_i386_iterator_next(&it, &pa, &va, &dva, &prot)) { 322 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva, 323 prot, I386_PAGE_SIZE, 0)) { 324 return (0); 325 } 326 } 327 return (1); 328 } 329 330 static struct kvm_arch kvm_i386_minidump = { 331 .ka_probe = _i386_minidump_probe, 332 .ka_initvtop = _i386_minidump_initvtop, 333 .ka_freevtop = _i386_minidump_freevtop, 334 .ka_kvatop = _i386_minidump_kvatop, 335 .ka_native = _i386_native, 336 .ka_walk_pages = _i386_minidump_walk_pages, 337 }; 338 339 KVM_ARCH(kvm_i386_minidump); 340