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. (Taken from kvm_ia64.c) 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 * (Taken from kvm_ia64.c) 115 */ 116 static size_t 117 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs) 118 { 119 Elf_Ehdr *e = kd->vmst->mmapbase; 120 Elf_Phdr *p; 121 int n; 122 123 if (kd->rawdump) { 124 *ofs = pa; 125 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 126 } 127 128 p = (Elf_Phdr*)((char*)e + e->e_phoff); 129 n = e->e_phnum; 130 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 131 p++, n--; 132 if (n == 0) 133 return (0); 134 *ofs = (pa - p->p_paddr) + p->p_offset; 135 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 136 } 137 138 void 139 _kvm_freevtop(kvm_t *kd) 140 { 141 struct vmstate *vm = kd->vmst; 142 143 if (kd->vmst->minidump) 144 return (_kvm_minidump_freevtop(kd)); 145 if (vm->mmapbase != NULL) 146 munmap(vm->mmapbase, vm->mmapsize); 147 if (vm->PTD) 148 free(vm->PTD); 149 free(vm); 150 kd->vmst = NULL; 151 } 152 153 int 154 _kvm_initvtop(kvm_t *kd) 155 { 156 struct nlist nl[2]; 157 u_long pa; 158 u_long kernbase; 159 char *PTD; 160 Elf_Ehdr *ehdr; 161 size_t hdrsz; 162 int i; 163 char minihdr[8]; 164 165 if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8) 166 if (memcmp(&minihdr, "minidump", 8) == 0) 167 return (_kvm_minidump_initvtop(kd)); 168 169 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); 170 if (kd->vmst == 0) { 171 _kvm_err(kd, kd->program, "cannot allocate vm"); 172 return (-1); 173 } 174 kd->vmst->PTD = 0; 175 176 if (kd->rawdump == 0) { 177 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1) 178 return (-1); 179 180 ehdr = kd->vmst->mmapbase; 181 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 182 if (_kvm_maphdrs(kd, hdrsz) == -1) 183 return (-1); 184 } 185 186 nl[0].n_name = "kernbase"; 187 nl[1].n_name = 0; 188 189 if (kvm_nlist(kd, nl) != 0) 190 kernbase = KERNBASE; /* for old kernels */ 191 else 192 kernbase = nl[0].n_value; 193 194 nl[0].n_name = "IdlePDPT"; 195 nl[1].n_name = 0; 196 197 if (kvm_nlist(kd, nl) == 0) { 198 uint64_t pa64; 199 200 if (kvm_read(kd, (nl[0].n_value - kernbase), &pa, 201 sizeof(pa)) != sizeof(pa)) { 202 _kvm_err(kd, kd->program, "cannot read IdlePDPT"); 203 return (-1); 204 } 205 PTD = _kvm_malloc(kd, 4 * PAGE_SIZE); 206 for (i = 0; i < 4; i++) { 207 if (kvm_read(kd, pa + (i * sizeof(pa64)), &pa64, 208 sizeof(pa64)) != sizeof(pa64)) { 209 _kvm_err(kd, kd->program, "Cannot read PDPT"); 210 free(PTD); 211 return (-1); 212 } 213 if (kvm_read(kd, pa64 & PG_FRAME_PAE, 214 PTD + (i * PAGE_SIZE), PAGE_SIZE) != (PAGE_SIZE)) { 215 _kvm_err(kd, kd->program, "cannot read PDPT"); 216 free(PTD); 217 return (-1); 218 } 219 } 220 kd->vmst->PTD = PTD; 221 kd->vmst->pae = 1; 222 } else { 223 nl[0].n_name = "IdlePTD"; 224 nl[1].n_name = 0; 225 226 if (kvm_nlist(kd, nl) != 0) { 227 _kvm_err(kd, kd->program, "bad namelist"); 228 return (-1); 229 } 230 if (kvm_read(kd, (nl[0].n_value - kernbase), &pa, 231 sizeof(pa)) != sizeof(pa)) { 232 _kvm_err(kd, kd->program, "cannot read IdlePTD"); 233 return (-1); 234 } 235 PTD = _kvm_malloc(kd, PAGE_SIZE); 236 if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) { 237 _kvm_err(kd, kd->program, "cannot read PTD"); 238 return (-1); 239 } 240 kd->vmst->PTD = PTD; 241 kd->vmst->pae = 0; 242 } 243 return (0); 244 } 245 246 static int 247 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa) 248 { 249 struct vmstate *vm; 250 u_long offset; 251 u_long pte_pa; 252 u_long pde_pa; 253 pd_entry_t pde; 254 pt_entry_t pte; 255 u_long pdeindex; 256 u_long pteindex; 257 size_t s; 258 u_long a; 259 off_t ofs; 260 uint32_t *PTD; 261 262 vm = kd->vmst; 263 PTD = (uint32_t *)vm->PTD; 264 offset = va & (PAGE_SIZE - 1); 265 266 /* 267 * If we are initializing (kernel page table descriptor pointer 268 * not yet set) then return pa == va to avoid infinite recursion. 269 */ 270 if (PTD == 0) { 271 s = _kvm_pa2off(kd, va, pa); 272 if (s == 0) { 273 _kvm_err(kd, kd->program, 274 "_kvm_vatop: bootstrap data not in dump"); 275 goto invalid; 276 } else 277 return (PAGE_SIZE - offset); 278 } 279 280 pdeindex = va >> PDRSHIFT; 281 pde = PTD[pdeindex]; 282 if (((u_long)pde & PG_V) == 0) { 283 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid"); 284 goto invalid; 285 } 286 287 if ((u_long)pde & PG_PS) { 288 /* 289 * No second-level page table; ptd describes one 4MB page. 290 * (We assume that the kernel wouldn't set PG_PS without enabling 291 * it cr0). 292 */ 293 #define PAGE4M_MASK (NBPDR - 1) 294 #define PG_FRAME4M (~PAGE4M_MASK) 295 pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK); 296 s = _kvm_pa2off(kd, pde_pa, &ofs); 297 if (s == 0) { 298 _kvm_err(kd, kd->program, 299 "_kvm_vatop: 4MB page address not in dump"); 300 goto invalid; 301 } 302 *pa = ofs; 303 return (NBPDR - (va & PAGE4M_MASK)); 304 } 305 306 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 307 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde)); 308 309 s = _kvm_pa2off(kd, pte_pa, &ofs); 310 if (s < sizeof pte) { 311 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found"); 312 goto invalid; 313 } 314 315 /* XXX This has to be a physical address read, kvm_read is virtual */ 316 if (lseek(kd->pmfd, ofs, 0) == -1) { 317 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 318 goto invalid; 319 } 320 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 321 _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 322 goto invalid; 323 } 324 if (((u_long)pte & PG_V) == 0) { 325 _kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid"); 326 goto invalid; 327 } 328 329 a = ((u_long)pte & PG_FRAME) + offset; 330 s =_kvm_pa2off(kd, a, pa); 331 if (s == 0) { 332 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump"); 333 goto invalid; 334 } else 335 return (PAGE_SIZE - offset); 336 337 invalid: 338 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 339 return (0); 340 } 341 342 static int 343 _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa) 344 { 345 struct vmstate *vm; 346 uint64_t offset; 347 uint64_t pte_pa; 348 uint64_t pde_pa; 349 uint64_t pde; 350 uint64_t pte; 351 u_long pdeindex; 352 u_long pteindex; 353 size_t s; 354 uint64_t a; 355 off_t ofs; 356 uint64_t *PTD; 357 358 vm = kd->vmst; 359 PTD = (uint64_t *)vm->PTD; 360 offset = va & (PAGE_SIZE - 1); 361 362 /* 363 * If we are initializing (kernel page table descriptor pointer 364 * not yet set) then return pa == va to avoid infinite recursion. 365 */ 366 if (PTD == 0) { 367 s = _kvm_pa2off(kd, va, pa); 368 if (s == 0) { 369 _kvm_err(kd, kd->program, 370 "_kvm_vatop_pae: bootstrap data not in dump"); 371 goto invalid; 372 } else 373 return (PAGE_SIZE - offset); 374 } 375 376 pdeindex = va >> PDRSHIFT_PAE; 377 pde = PTD[pdeindex]; 378 if (((u_long)pde & PG_V) == 0) { 379 _kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid"); 380 goto invalid; 381 } 382 383 if ((u_long)pde & PG_PS) { 384 /* 385 * No second-level page table; ptd describes one 2MB page. 386 * (We assume that the kernel wouldn't set PG_PS without enabling 387 * it cr0). 388 */ 389 #define PAGE2M_MASK (NBPDR_PAE - 1) 390 #define PG_FRAME2M (~PAGE2M_MASK) 391 pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK); 392 s = _kvm_pa2off(kd, pde_pa, &ofs); 393 if (s == 0) { 394 _kvm_err(kd, kd->program, 395 "_kvm_vatop: 2MB page address not in dump"); 396 goto invalid; 397 } 398 *pa = ofs; 399 return (NBPDR_PAE - (va & PAGE2M_MASK)); 400 } 401 402 pteindex = (va >> PAGE_SHIFT) & (NPTEPG_PAE-1); 403 pte_pa = ((uint64_t)pde & PG_FRAME_PAE) + (pteindex * sizeof(pde)); 404 405 s = _kvm_pa2off(kd, pte_pa, &ofs); 406 if (s < sizeof pte) { 407 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pdpe_pa not found"); 408 goto invalid; 409 } 410 411 /* XXX This has to be a physical address read, kvm_read is virtual */ 412 if (lseek(kd->pmfd, ofs, 0) == -1) { 413 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: lseek"); 414 goto invalid; 415 } 416 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 417 _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: read"); 418 goto invalid; 419 } 420 if (((uint64_t)pte & PG_V) == 0) { 421 _kvm_err(kd, kd->program, "_kvm_vatop_pae: pte not valid"); 422 goto invalid; 423 } 424 425 a = ((uint64_t)pte & PG_FRAME_PAE) + offset; 426 s =_kvm_pa2off(kd, a, pa); 427 if (s == 0) { 428 _kvm_err(kd, kd->program, 429 "_kvm_vatop_pae: address not in dump"); 430 goto invalid; 431 } else 432 return (PAGE_SIZE - offset); 433 434 invalid: 435 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 436 return (0); 437 } 438 439 int 440 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 441 { 442 443 if (kd->vmst->minidump) 444 return (_kvm_minidump_kvatop(kd, va, pa)); 445 if (ISALIVE(kd)) { 446 _kvm_err(kd, 0, "vatop called in live kernel!"); 447 return (0); 448 } 449 if (kd->vmst->pae) 450 return (_kvm_vatop_pae(kd, va, pa)); 451 else 452 return (_kvm_vatop(kd, va, pa)); 453 } 454