1 /*- 2 * Copyright (c) 1989, 1992, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software developed by the Computer Systems 6 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 7 * BG 91-66 and contributed to Berkeley. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 #endif /* LIBC_SCCS and not lint */ 42 43 /* 44 * i386 machine dependent routines for kvm. Hopefully, the forthcoming 45 * vm code will one day obsolete this module. 46 */ 47 48 #include <sys/param.h> 49 #include <sys/endian.h> 50 #include <stdint.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 #include <kvm.h> 55 56 #ifdef __i386__ 57 #include <machine/vmparam.h> /* For KERNBASE. */ 58 #endif 59 60 #include <limits.h> 61 62 #include "kvm_private.h" 63 #include "kvm_i386.h" 64 65 struct vmstate { 66 void *PTD; 67 int pae; 68 size_t phnum; 69 GElf_Phdr *phdr; 70 }; 71 72 /* 73 * Translate a physical memory address to a file-offset in the crash-dump. 74 */ 75 static size_t 76 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs) 77 { 78 struct vmstate *vm = kd->vmst; 79 GElf_Phdr *p; 80 size_t n; 81 82 if (kd->rawdump) { 83 *ofs = pa; 84 return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK)); 85 } 86 87 p = vm->phdr; 88 n = vm->phnum; 89 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 90 p++, n--; 91 if (n == 0) 92 return (0); 93 *ofs = (pa - p->p_paddr) + p->p_offset; 94 return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK)); 95 } 96 97 static void 98 _i386_freevtop(kvm_t *kd) 99 { 100 struct vmstate *vm = kd->vmst; 101 102 if (vm->PTD) 103 free(vm->PTD); 104 free(vm->phdr); 105 free(vm); 106 kd->vmst = NULL; 107 } 108 109 static int 110 _i386_probe(kvm_t *kd) 111 { 112 113 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && 114 !_kvm_is_minidump(kd)); 115 } 116 117 static int 118 _i386_initvtop(kvm_t *kd) 119 { 120 struct kvm_nlist nl[2]; 121 i386_physaddr_t pa; 122 kvaddr_t kernbase; 123 char *PTD; 124 int i; 125 126 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate)); 127 if (kd->vmst == NULL) { 128 _kvm_err(kd, kd->program, "cannot allocate vm"); 129 return (-1); 130 } 131 kd->vmst->PTD = 0; 132 133 if (kd->rawdump == 0) { 134 if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum, 135 &kd->vmst->phdr) == -1) 136 return (-1); 137 } 138 139 nl[0].n_name = "kernbase"; 140 nl[1].n_name = 0; 141 142 if (kvm_nlist2(kd, nl) != 0) { 143 #ifdef __i386__ 144 kernbase = KERNBASE; /* for old kernels */ 145 #else 146 _kvm_err(kd, kd->program, "cannot resolve kernbase"); 147 return (-1); 148 #endif 149 } else 150 kernbase = nl[0].n_value; 151 152 nl[0].n_name = "IdlePDPT"; 153 nl[1].n_name = 0; 154 155 if (kvm_nlist2(kd, nl) == 0) { 156 i386_physaddr_pae_t pa64; 157 158 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa, 159 sizeof(pa)) != sizeof(pa)) { 160 _kvm_err(kd, kd->program, "cannot read IdlePDPT"); 161 return (-1); 162 } 163 pa = le32toh(pa); 164 PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE); 165 if (PTD == NULL) { 166 _kvm_err(kd, kd->program, "cannot allocate PTD"); 167 return (-1); 168 } 169 for (i = 0; i < 4; i++) { 170 if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64, 171 sizeof(pa64)) != sizeof(pa64)) { 172 _kvm_err(kd, kd->program, "Cannot read PDPT"); 173 free(PTD); 174 return (-1); 175 } 176 pa64 = le64toh(pa64); 177 if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE, 178 PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) != 179 I386_PAGE_SIZE) { 180 _kvm_err(kd, kd->program, "cannot read PDPT"); 181 free(PTD); 182 return (-1); 183 } 184 } 185 kd->vmst->PTD = PTD; 186 kd->vmst->pae = 1; 187 } else { 188 nl[0].n_name = "IdlePTD"; 189 nl[1].n_name = 0; 190 191 if (kvm_nlist2(kd, nl) != 0) { 192 _kvm_err(kd, kd->program, "bad namelist"); 193 return (-1); 194 } 195 if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa, 196 sizeof(pa)) != sizeof(pa)) { 197 _kvm_err(kd, kd->program, "cannot read IdlePTD"); 198 return (-1); 199 } 200 pa = le32toh(pa); 201 PTD = _kvm_malloc(kd, I386_PAGE_SIZE); 202 if (PTD == NULL) { 203 _kvm_err(kd, kd->program, "cannot allocate PTD"); 204 return (-1); 205 } 206 if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) { 207 _kvm_err(kd, kd->program, "cannot read PTD"); 208 return (-1); 209 } 210 kd->vmst->PTD = PTD; 211 kd->vmst->pae = 0; 212 } 213 return (0); 214 } 215 216 static int 217 _i386_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 218 { 219 struct vmstate *vm; 220 i386_physaddr_t offset; 221 i386_physaddr_t pte_pa; 222 i386_pde_t pde; 223 i386_pte_t pte; 224 kvaddr_t pdeindex; 225 kvaddr_t pteindex; 226 size_t s; 227 i386_physaddr_t a; 228 off_t ofs; 229 i386_pde_t *PTD; 230 231 vm = kd->vmst; 232 PTD = (i386_pde_t *)vm->PTD; 233 offset = va & I386_PAGE_MASK; 234 235 /* 236 * If we are initializing (kernel page table descriptor pointer 237 * not yet set) then return pa == va to avoid infinite recursion. 238 */ 239 if (PTD == NULL) { 240 s = _kvm_pa2off(kd, va, pa); 241 if (s == 0) { 242 _kvm_err(kd, kd->program, 243 "_i386_vatop: bootstrap data not in dump"); 244 goto invalid; 245 } else 246 return (I386_PAGE_SIZE - offset); 247 } 248 249 pdeindex = va >> I386_PDRSHIFT; 250 pde = le32toh(PTD[pdeindex]); 251 if ((pde & I386_PG_V) == 0) { 252 _kvm_err(kd, kd->program, "_i386_vatop: pde not valid"); 253 goto invalid; 254 } 255 256 if (pde & I386_PG_PS) { 257 /* 258 * No second-level page table; ptd describes one 4MB 259 * page. (We assume that the kernel wouldn't set 260 * PG_PS without enabling it cr0). 261 */ 262 offset = va & I386_PAGE_PS_MASK; 263 a = (pde & I386_PG_PS_FRAME) + offset; 264 s = _kvm_pa2off(kd, a, pa); 265 if (s == 0) { 266 _kvm_err(kd, kd->program, 267 "_i386_vatop: 4MB page address not in dump"); 268 goto invalid; 269 } 270 return (I386_NBPDR - offset); 271 } 272 273 pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1); 274 pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte)); 275 276 s = _kvm_pa2off(kd, pte_pa, &ofs); 277 if (s < sizeof(pte)) { 278 _kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found"); 279 goto invalid; 280 } 281 282 /* XXX This has to be a physical address read, kvm_read is virtual */ 283 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) { 284 _kvm_syserr(kd, kd->program, "_i386_vatop: pread"); 285 goto invalid; 286 } 287 pte = le32toh(pte); 288 if ((pte & I386_PG_V) == 0) { 289 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid"); 290 goto invalid; 291 } 292 293 a = (pte & I386_PG_FRAME) + offset; 294 s = _kvm_pa2off(kd, a, pa); 295 if (s == 0) { 296 _kvm_err(kd, kd->program, "_i386_vatop: address not in dump"); 297 goto invalid; 298 } else 299 return (I386_PAGE_SIZE - offset); 300 301 invalid: 302 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 303 return (0); 304 } 305 306 static int 307 _i386_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) 308 { 309 struct vmstate *vm; 310 i386_physaddr_pae_t offset; 311 i386_physaddr_pae_t pte_pa; 312 i386_pde_pae_t pde; 313 i386_pte_pae_t pte; 314 kvaddr_t pdeindex; 315 kvaddr_t pteindex; 316 size_t s; 317 i386_physaddr_pae_t a; 318 off_t ofs; 319 i386_pde_pae_t *PTD; 320 321 vm = kd->vmst; 322 PTD = (i386_pde_pae_t *)vm->PTD; 323 offset = va & I386_PAGE_MASK; 324 325 /* 326 * If we are initializing (kernel page table descriptor pointer 327 * not yet set) then return pa == va to avoid infinite recursion. 328 */ 329 if (PTD == NULL) { 330 s = _kvm_pa2off(kd, va, pa); 331 if (s == 0) { 332 _kvm_err(kd, kd->program, 333 "_i386_vatop_pae: bootstrap data not in dump"); 334 goto invalid; 335 } else 336 return (I386_PAGE_SIZE - offset); 337 } 338 339 pdeindex = va >> I386_PDRSHIFT_PAE; 340 pde = le64toh(PTD[pdeindex]); 341 if ((pde & I386_PG_V) == 0) { 342 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid"); 343 goto invalid; 344 } 345 346 if (pde & I386_PG_PS) { 347 /* 348 * No second-level page table; ptd describes one 2MB 349 * page. (We assume that the kernel wouldn't set 350 * PG_PS without enabling it cr0). 351 */ 352 offset = va & I386_PAGE_PS_MASK_PAE; 353 a = (pde & I386_PG_PS_FRAME_PAE) + offset; 354 s = _kvm_pa2off(kd, a, pa); 355 if (s == 0) { 356 _kvm_err(kd, kd->program, 357 "_i386_vatop: 2MB page address not in dump"); 358 goto invalid; 359 } 360 return (I386_NBPDR_PAE - offset); 361 } 362 363 pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1); 364 pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde)); 365 366 s = _kvm_pa2off(kd, pte_pa, &ofs); 367 if (s < sizeof(pte)) { 368 _kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found"); 369 goto invalid; 370 } 371 372 /* XXX This has to be a physical address read, kvm_read is virtual */ 373 if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) { 374 _kvm_syserr(kd, kd->program, "_i386_vatop_pae: read"); 375 goto invalid; 376 } 377 pte = le64toh(pte); 378 if ((pte & I386_PG_V) == 0) { 379 _kvm_err(kd, kd->program, "_i386_vatop_pae: pte not valid"); 380 goto invalid; 381 } 382 383 a = (pte & I386_PG_FRAME_PAE) + offset; 384 s = _kvm_pa2off(kd, a, pa); 385 if (s == 0) { 386 _kvm_err(kd, kd->program, 387 "_i386_vatop_pae: address not in dump"); 388 goto invalid; 389 } else 390 return (I386_PAGE_SIZE - offset); 391 392 invalid: 393 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 394 return (0); 395 } 396 397 static int 398 _i386_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 399 { 400 401 if (ISALIVE(kd)) { 402 _kvm_err(kd, 0, "vatop called in live kernel!"); 403 return (0); 404 } 405 if (kd->vmst->pae) 406 return (_i386_vatop_pae(kd, va, pa)); 407 else 408 return (_i386_vatop(kd, va, pa)); 409 } 410 411 int 412 _i386_native(kvm_t *kd __unused) 413 { 414 415 #ifdef __i386__ 416 return (1); 417 #else 418 return (0); 419 #endif 420 } 421 422 static struct kvm_arch kvm_i386 = { 423 .ka_probe = _i386_probe, 424 .ka_initvtop = _i386_initvtop, 425 .ka_freevtop = _i386_freevtop, 426 .ka_kvatop = _i386_kvatop, 427 .ka_native = _i386_native, 428 }; 429 430 KVM_ARCH(kvm_i386); 431