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 <kvm.h> 40 41 #include "../../sys/i386/include/minidump.h" 42 43 #include <limits.h> 44 45 #include "kvm_private.h" 46 #include "kvm_i386.h" 47 48 #define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE) 49 50 struct vmstate { 51 struct minidumphdr hdr; 52 }; 53 54 static i386_pte_pae_t 55 _i386_pte_pae_get(kvm_t *kd, u_long pteindex) 56 { 57 i386_pte_pae_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); 58 59 return le64toh(*pte); 60 } 61 62 static i386_pte_t 63 _i386_pte_get(kvm_t *kd, u_long pteindex) 64 { 65 i386_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); 66 67 return le32toh(*pte); 68 } 69 70 static int 71 _i386_minidump_probe(kvm_t *kd) 72 { 73 74 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && 75 _kvm_is_minidump(kd)); 76 } 77 78 static void 79 _i386_minidump_freevtop(kvm_t *kd) 80 { 81 struct vmstate *vm = kd->vmst; 82 83 free(vm); 84 kd->vmst = NULL; 85 } 86 87 static int 88 _i386_minidump_initvtop(kvm_t *kd) 89 { 90 struct vmstate *vmst; 91 off_t off, sparse_off; 92 93 vmst = _kvm_malloc(kd, sizeof(*vmst)); 94 if (vmst == NULL) { 95 _kvm_err(kd, kd->program, "cannot allocate vm"); 96 return (-1); 97 } 98 kd->vmst = vmst; 99 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != 100 sizeof(vmst->hdr)) { 101 _kvm_err(kd, kd->program, "cannot read dump header"); 102 return (-1); 103 } 104 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { 105 _kvm_err(kd, kd->program, "not a minidump for this platform"); 106 return (-1); 107 } 108 vmst->hdr.version = le32toh(vmst->hdr.version); 109 if (vmst->hdr.version != MINIDUMP_VERSION) { 110 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", 111 MINIDUMP_VERSION, vmst->hdr.version); 112 return (-1); 113 } 114 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize); 115 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize); 116 vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize); 117 vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase); 118 vmst->hdr.paemode = le32toh(vmst->hdr.paemode); 119 120 /* Skip header and msgbuf */ 121 off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize); 122 123 sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) + 124 i386_round_page(vmst->hdr.ptesize); 125 if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off, 126 I386_PAGE_SIZE, sizeof(uint32_t)) == -1) { 127 return (-1); 128 } 129 off += i386_round_page(vmst->hdr.bitmapsize); 130 131 if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) { 132 return (-1); 133 } 134 off += i386_round_page(vmst->hdr.ptesize); 135 136 return (0); 137 } 138 139 static int 140 _i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) 141 { 142 struct vmstate *vm; 143 i386_physaddr_pae_t offset; 144 i386_pte_pae_t pte; 145 kvaddr_t pteindex; 146 i386_physaddr_pae_t a; 147 off_t ofs; 148 149 vm = kd->vmst; 150 offset = va & I386_PAGE_MASK; 151 152 if (va >= vm->hdr.kernbase) { 153 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 154 if (pteindex >= vm->hdr.ptesize / sizeof(pte)) 155 goto invalid; 156 pte = _i386_pte_pae_get(kd, pteindex); 157 if ((pte & I386_PG_V) == 0) { 158 _kvm_err(kd, kd->program, 159 "_i386_minidump_vatop_pae: pte not valid"); 160 goto invalid; 161 } 162 a = pte & I386_PG_FRAME_PAE; 163 ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); 164 if (ofs == -1) { 165 _kvm_err(kd, kd->program, 166 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump", 167 (uintmax_t)a); 168 goto invalid; 169 } 170 *pa = ofs + offset; 171 return (I386_PAGE_SIZE - offset); 172 } else { 173 _kvm_err(kd, kd->program, 174 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped", 175 (uintmax_t)va); 176 goto invalid; 177 } 178 179 invalid: 180 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 181 return (0); 182 } 183 184 static int 185 _i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 186 { 187 struct vmstate *vm; 188 i386_physaddr_t offset; 189 i386_pte_t pte; 190 kvaddr_t pteindex; 191 i386_physaddr_t a; 192 off_t ofs; 193 194 vm = kd->vmst; 195 offset = va & I386_PAGE_MASK; 196 197 if (va >= vm->hdr.kernbase) { 198 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 199 if (pteindex >= vm->hdr.ptesize / sizeof(pte)) 200 goto invalid; 201 pte = _i386_pte_get(kd, pteindex); 202 if ((pte & I386_PG_V) == 0) { 203 _kvm_err(kd, kd->program, 204 "_i386_minidump_vatop: pte not valid"); 205 goto invalid; 206 } 207 a = pte & I386_PG_FRAME; 208 ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE); 209 if (ofs == -1) { 210 _kvm_err(kd, kd->program, 211 "_i386_minidump_vatop: physical address 0x%jx not in minidump", 212 (uintmax_t)a); 213 goto invalid; 214 } 215 *pa = ofs + offset; 216 return (I386_PAGE_SIZE - offset); 217 } else { 218 _kvm_err(kd, kd->program, 219 "_i386_minidump_vatop: virtual address 0x%jx not minidumped", 220 (uintmax_t)va); 221 goto invalid; 222 } 223 224 invalid: 225 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 226 return (0); 227 } 228 229 static int 230 _i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 231 { 232 233 if (ISALIVE(kd)) { 234 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!"); 235 return (0); 236 } 237 if (kd->vmst->hdr.paemode) 238 return (_i386_minidump_vatop_pae(kd, va, pa)); 239 else 240 return (_i386_minidump_vatop(kd, va, pa)); 241 } 242 243 static vm_prot_t 244 _i386_entry_to_prot(uint64_t pte) 245 { 246 vm_prot_t prot = VM_PROT_READ; 247 248 /* Source: i386/pmap.c:pmap_protect() */ 249 if (pte & I386_PG_RW) 250 prot |= VM_PROT_WRITE; 251 if ((pte & I386_PG_NX) == 0) 252 prot |= VM_PROT_EXECUTE; 253 254 return prot; 255 } 256 257 struct i386_iter { 258 kvm_t *kd; 259 u_long nptes; 260 u_long pteindex; 261 }; 262 263 static void 264 _i386_iterator_init(struct i386_iter *it, kvm_t *kd) 265 { 266 struct vmstate *vm = kd->vmst; 267 268 it->kd = kd; 269 it->pteindex = 0; 270 if (vm->hdr.paemode) { 271 it->nptes = vm->hdr.ptesize / sizeof(i386_pte_pae_t); 272 } else { 273 it->nptes = vm->hdr.ptesize / sizeof(i386_pte_t); 274 } 275 return; 276 } 277 278 static int 279 _i386_iterator_next(struct i386_iter *it, u_long *pa, u_long *va, u_long *dva, 280 vm_prot_t *prot) 281 { 282 struct vmstate *vm = it->kd->vmst; 283 i386_pte_t pte32; 284 i386_pte_pae_t pte64; 285 int found = 0; 286 287 *dva = 0; 288 for (; it->pteindex < it->nptes && found == 0; it->pteindex++) { 289 if (vm->hdr.paemode) { 290 pte64 = _i386_pte_pae_get(it->kd, it->pteindex); 291 if ((pte64 & I386_PG_V) == 0) 292 continue; 293 *prot = _i386_entry_to_prot(pte64); 294 *pa = pte64 & I386_PG_FRAME_PAE; 295 } else { 296 pte32 = _i386_pte_get(it->kd, it->pteindex); 297 if ((pte32 & I386_PG_V) == 0) 298 continue; 299 *prot = _i386_entry_to_prot(pte32); 300 *pa = pte32 & I386_PG_FRAME; 301 } 302 *va = vm->hdr.kernbase + (it->pteindex << I386_PAGE_SHIFT); 303 found = 1; 304 } 305 return found; 306 } 307 308 static int 309 _i386_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 310 { 311 struct i386_iter it; 312 u_long dva, pa, va; 313 vm_prot_t prot; 314 315 _i386_iterator_init(&it, kd); 316 while (_i386_iterator_next(&it, &pa, &va, &dva, &prot)) { 317 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva, 318 prot, I386_PAGE_SIZE, 0)) { 319 return (0); 320 } 321 } 322 return (1); 323 } 324 325 static struct kvm_arch kvm_i386_minidump = { 326 .ka_probe = _i386_minidump_probe, 327 .ka_initvtop = _i386_minidump_initvtop, 328 .ka_freevtop = _i386_minidump_freevtop, 329 .ka_kvatop = _i386_minidump_kvatop, 330 .ka_native = _i386_native, 331 .ka_walk_pages = _i386_minidump_walk_pages, 332 }; 333 334 KVM_ARCH(kvm_i386_minidump); 335