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 * 4. 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/user.h> 50 #include <sys/proc.h> 51 #include <sys/stat.h> 52 #include <sys/mman.h> 53 #include <stdlib.h> 54 #include <string.h> 55 #include <unistd.h> 56 #include <nlist.h> 57 #include <kvm.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_param.h> 61 62 #include <machine/elf.h> 63 64 #include <limits.h> 65 66 #include "kvm_private.h" 67 68 #ifndef btop 69 #define btop(x) (i386_btop(x)) 70 #define ptob(x) (i386_ptob(x)) 71 #endif 72 73 #define PG_FRAME_PAE (~((uint64_t)PAGE_MASK)) 74 #define PDRSHIFT_PAE 21 75 #define NPTEPG_PAE (PAGE_SIZE/sizeof(uint64_t)) 76 #define NBPDR_PAE (1<<PDRSHIFT_PAE) 77 78 /* minidump must be the first item! */ 79 struct vmstate { 80 int minidump; /* 1 = minidump mode */ 81 void *mmapbase; 82 size_t mmapsize; 83 void *PTD; 84 int pae; 85 }; 86 87 /* 88 * Map the ELF headers into the process' address space. We do this in two 89 * steps: first the ELF header itself and using that information the whole 90 * set of headers. 91 */ 92 static int 93 _kvm_maphdrs(kvm_t *kd, size_t sz) 94 { 95 struct vmstate *vm = kd->vmst; 96 97 /* munmap() previous mmap(). */ 98 if (vm->mmapbase != NULL) { 99 munmap(vm->mmapbase, vm->mmapsize); 100 vm->mmapbase = NULL; 101 } 102 103 vm->mmapsize = sz; 104 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 105 if (vm->mmapbase == MAP_FAILED) { 106 _kvm_err(kd, kd->program, "cannot mmap corefile"); 107 return (-1); 108 } 109 return (0); 110 } 111 112 /* 113 * Translate a physical memory address to a file-offset in the crash-dump. 114 */ 115 static size_t 116 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs) 117 { 118 Elf_Ehdr *e = kd->vmst->mmapbase; 119 Elf_Phdr *p; 120 int n; 121 122 if (kd->rawdump) { 123 *ofs = pa; 124 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 125 } 126 127 p = (Elf_Phdr*)((char*)e + e->e_phoff); 128 n = e->e_phnum; 129 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 130 p++, n--; 131 if (n == 0) 132 return (0); 133 *ofs = (pa - p->p_paddr) + p->p_offset; 134 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 135 } 136 137 void 138 _kvm_freevtop(kvm_t *kd) 139 { 140 struct vmstate *vm = kd->vmst; 141 142 if (kd->vmst->minidump) 143 return (_kvm_minidump_freevtop(kd)); 144 if (vm->mmapbase != NULL) 145 munmap(vm->mmapbase, vm->mmapsize); 146 if (vm->PTD) 147 free(vm->PTD); 148 free(vm); 149 kd->vmst = NULL; 150 } 151 152 int 153 _kvm_initvtop(kvm_t *kd) 154 { 155 struct nlist nl[2]; 156 u_long pa; 157 u_long kernbase; 158 char *PTD; 159 Elf_Ehdr *ehdr; 160 size_t hdrsz; 161 int i; 162 char minihdr[8]; 163 164 if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8) 165 if (memcmp(&minihdr, "minidump", 8) == 0) 166 return (_kvm_minidump_initvtop(kd)); 167 168 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); 169 if (kd->vmst == 0) { 170 _kvm_err(kd, kd->program, "cannot allocate vm"); 171 return (-1); 172 } 173 kd->vmst->PTD = 0; 174 175 if (kd->rawdump == 0) { 176 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1) 177 return (-1); 178 179 ehdr = kd->vmst->mmapbase; 180 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 181 if (_kvm_maphdrs(kd, hdrsz) == -1) 182 return (-1); 183 } 184 185 nl[0].n_name = "kernbase"; 186 nl[1].n_name = 0; 187 188 if (kvm_nlist(kd, nl) != 0) 189 kernbase = KERNBASE; /* for old kernels */ 190 else 191 kernbase = nl[0].n_value; 192 193 nl[0].n_name = "IdlePDPT"; 194 nl[1].n_name = 0; 195 196 if (kvm_nlist(kd, nl) == 0) { 197 uint64_t pa64; 198 199 if (kvm_read(kd, (nl[0].n_value - kernbase), &pa, 200 sizeof(pa)) != sizeof(pa)) { 201 _kvm_err(kd, kd->program, "cannot read IdlePDPT"); 202 return (-1); 203 } 204 PTD = _kvm_malloc(kd, 4 * PAGE_SIZE); 205 for (i = 0; i < 4; i++) { 206 if (kvm_read(kd, pa + (i * sizeof(pa64)), &pa64, 207 sizeof(pa64)) != sizeof(pa64)) { 208 _kvm_err(kd, kd->program, "Cannot read PDPT"); 209 free(PTD); 210 return (-1); 211 } 212 if (kvm_read(kd, pa64 & PG_FRAME_PAE, 213 PTD + (i * PAGE_SIZE), PAGE_SIZE) != (PAGE_SIZE)) { 214 _kvm_err(kd, kd->program, "cannot read PDPT"); 215 free(PTD); 216 return (-1); 217 } 218 } 219 kd->vmst->PTD = PTD; 220 kd->vmst->pae = 1; 221 } else { 222 nl[0].n_name = "IdlePTD"; 223 nl[1].n_name = 0; 224 225 if (kvm_nlist(kd, nl) != 0) { 226 _kvm_err(kd, kd->program, "bad namelist"); 227 return (-1); 228 } 229 if (kvm_read(kd, (nl[0].n_value - kernbase), &pa, 230 sizeof(pa)) != sizeof(pa)) { 231 _kvm_err(kd, kd->program, "cannot read IdlePTD"); 232 return (-1); 233 } 234 PTD = _kvm_malloc(kd, PAGE_SIZE); 235 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) { 236 _kvm_err(kd, kd->program, "cannot read PTD"); 237 return (-1); 238 } 239 kd->vmst->PTD = PTD; 240 kd->vmst->pae = 0; 241 } 242 return (0); 243 } 244 245 static int 246 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa) 247 { 248 struct vmstate *vm; 249 u_long offset; 250 u_long pte_pa; 251 u_long pde_pa; 252 pd_entry_t pde; 253 pt_entry_t pte; 254 u_long pdeindex; 255 u_long pteindex; 256 size_t s; 257 u_long a; 258 off_t ofs; 259 uint32_t *PTD; 260 261 vm = kd->vmst; 262 PTD = (uint32_t *)vm->PTD; 263 offset = va & (PAGE_SIZE - 1); 264 265 /* 266 * If we are initializing (kernel page table descriptor pointer 267 * not yet set) then return pa == va to avoid infinite recursion. 268 */ 269 if (PTD == 0) { 270 s = _kvm_pa2off(kd, va, pa); 271 if (s == 0) { 272 _kvm_err(kd, kd->program, 273 "_kvm_vatop: bootstrap data not in dump"); 274 goto invalid; 275 } else 276 return (PAGE_SIZE - offset); 277 } 278 279 pdeindex = va >> PDRSHIFT; 280 pde = PTD[pdeindex]; 281 if (((u_long)pde & PG_V) == 0) { 282 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid"); 283 goto invalid; 284 } 285 286 if ((u_long)pde & PG_PS) { 287 /* 288 * No second-level page table; ptd describes one 4MB page. 289 * (We assume that the kernel wouldn't set PG_PS without enabling 290 * it cr0). 291 */ 292 #define PAGE4M_MASK (NBPDR - 1) 293 #define PG_FRAME4M (~PAGE4M_MASK) 294 pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK); 295 s = _kvm_pa2off(kd, pde_pa, &ofs); 296 if (s == 0) { 297 _kvm_err(kd, kd->program, 298 "_kvm_vatop: 4MB page address not in dump"); 299 goto invalid; 300 } 301 *pa = ofs; 302 return (NBPDR - (va & PAGE4M_MASK)); 303 } 304 305 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 306 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde)); 307 308 s = _kvm_pa2off(kd, pte_pa, &ofs); 309 if (s < sizeof pte) { 310 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found"); 311 goto invalid; 312 } 313 314 /* XXX This has to be a physical address read, kvm_read is virtual */ 315 if (lseek(kd->pmfd, ofs, 0) == -1) { 316 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 317 goto invalid; 318 } 319 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 320 _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 321 goto invalid; 322 } 323 if (((u_long)pte & PG_V) == 0) { 324 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid"); 325 goto invalid; 326 } 327 328 a = ((u_long)pte & PG_FRAME) + offset; 329 s =_kvm_pa2off(kd, a, pa); 330 if (s == 0) { 331 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump"); 332 goto invalid; 333 } else 334 return (PAGE_SIZE - offset); 335 336 invalid: 337 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 338 return (0); 339 } 340 341 static int 342 _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa) 343 { 344 struct vmstate *vm; 345 uint64_t offset; 346 uint64_t pte_pa; 347 uint64_t pde_pa; 348 uint64_t pde; 349 uint64_t pte; 350 u_long pdeindex; 351 u_long pteindex; 352 size_t s; 353 uint64_t a; 354 off_t ofs; 355 uint64_t *PTD; 356 357 vm = kd->vmst; 358 PTD = (uint64_t *)vm->PTD; 359 offset = va & (PAGE_SIZE - 1); 360 361 /* 362 * If we are initializing (kernel page table descriptor pointer 363 * not yet set) then return pa == va to avoid infinite recursion. 364 */ 365 if (PTD == 0) { 366 s = _kvm_pa2off(kd, va, pa); 367 if (s == 0) { 368 _kvm_err(kd, kd->program, 369 "_kvm_vatop_pae: bootstrap data not in dump"); 370 goto invalid; 371 } else 372 return (PAGE_SIZE - offset); 373 } 374 375 pdeindex = va >> PDRSHIFT_PAE; 376 pde = PTD[pdeindex]; 377 if (((u_long)pde & PG_V) == 0) { 378 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid"); 379 goto invalid; 380 } 381 382 if ((u_long)pde & PG_PS) { 383 /* 384 * No second-level page table; ptd describes one 2MB page. 385 * (We assume that the kernel wouldn't set PG_PS without enabling 386 * it cr0). 387 */ 388 #define PAGE2M_MASK (NBPDR_PAE - 1) 389 #define PG_FRAME2M (~PAGE2M_MASK) 390 pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK); 391 s = _kvm_pa2off(kd, pde_pa, &ofs); 392 if (s == 0) { 393 _kvm_err(kd, kd->program, 394 "_kvm_vatop: 2MB page address not in dump"); 395 goto invalid; 396 } 397 *pa = ofs; 398 return (NBPDR_PAE - (va & PAGE2M_MASK)); 399 } 400 401 pteindex = (va >> PAGE_SHIFT) & (NPTEPG_PAE-1); 402 pte_pa = ((uint64_t)pde & PG_FRAME_PAE) + (pteindex * sizeof(pde)); 403 404 s = _kvm_pa2off(kd, pte_pa, &ofs); 405 if (s < sizeof pte) { 406 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pdpe_pa not found"); 407 goto invalid; 408 } 409 410 /* XXX This has to be a physical address read, kvm_read is virtual */ 411 if (lseek(kd->pmfd, ofs, 0) == -1) { 412 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: lseek"); 413 goto invalid; 414 } 415 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 416 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: read"); 417 goto invalid; 418 } 419 if (((uint64_t)pte & PG_V) == 0) { 420 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pte not valid"); 421 goto invalid; 422 } 423 424 a = ((uint64_t)pte & PG_FRAME_PAE) + offset; 425 s =_kvm_pa2off(kd, a, pa); 426 if (s == 0) { 427 _kvm_err(kd, kd->program, 428 "_kvm_vatop_pae: address not in dump"); 429 goto invalid; 430 } else 431 return (PAGE_SIZE - offset); 432 433 invalid: 434 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 435 return (0); 436 } 437 438 int 439 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 440 { 441 442 if (kd->vmst->minidump) 443 return (_kvm_minidump_kvatop(kd, va, pa)); 444 if (ISALIVE(kd)) { 445 _kvm_err(kd, 0, "vatop called in live kernel!"); 446 return (0); 447 } 448 if (kd->vmst->pae) 449 return (_kvm_vatop_pae(kd, va, pa)); 450 else 451 return (_kvm_vatop(kd, va, pa)); 452 } 453