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 * AMD64 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) (amd64_btop(x)) 70 #define ptob(x) (amd64_ptob(x)) 71 #endif 72 73 /* minidump must be the first item! */ 74 struct vmstate { 75 int minidump; /* 1 = minidump mode */ 76 void *mmapbase; 77 size_t mmapsize; 78 pml4_entry_t *PML4; 79 }; 80 81 /* 82 * Map the ELF headers into the process' address space. We do this in two 83 * steps: first the ELF header itself and using that information the whole 84 * set of headers. (Taken from kvm_ia64.c) 85 */ 86 static int 87 _kvm_maphdrs(kvm_t *kd, size_t sz) 88 { 89 struct vmstate *vm = kd->vmst; 90 91 /* munmap() previous mmap(). */ 92 if (vm->mmapbase != NULL) { 93 munmap(vm->mmapbase, vm->mmapsize); 94 vm->mmapbase = NULL; 95 } 96 97 vm->mmapsize = sz; 98 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 99 if (vm->mmapbase == MAP_FAILED) { 100 _kvm_err(kd, kd->program, "cannot mmap corefile"); 101 return (-1); 102 } 103 return (0); 104 } 105 106 /* 107 * Translate a physical memory address to a file-offset in the crash-dump. 108 * (Taken from kvm_ia64.c) 109 */ 110 static size_t 111 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs) 112 { 113 Elf_Ehdr *e = kd->vmst->mmapbase; 114 Elf_Phdr *p; 115 int n; 116 117 if (kd->rawdump) { 118 *ofs = pa; 119 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 120 } 121 122 p = (Elf_Phdr*)((char*)e + e->e_phoff); 123 n = e->e_phnum; 124 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 125 p++, n--; 126 if (n == 0) 127 return (0); 128 *ofs = (pa - p->p_paddr) + p->p_offset; 129 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 130 } 131 132 void 133 _kvm_freevtop(kvm_t *kd) 134 { 135 struct vmstate *vm = kd->vmst; 136 137 if (kd->vmst->minidump) 138 return (_kvm_minidump_freevtop(kd)); 139 if (vm->mmapbase != NULL) 140 munmap(vm->mmapbase, vm->mmapsize); 141 if (vm->PML4) 142 free(vm->PML4); 143 free(vm); 144 kd->vmst = NULL; 145 } 146 147 int 148 _kvm_initvtop(kvm_t *kd) 149 { 150 struct nlist nlist[2]; 151 u_long pa; 152 u_long kernbase; 153 pml4_entry_t *PML4; 154 Elf_Ehdr *ehdr; 155 size_t hdrsz; 156 char minihdr[8]; 157 158 if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8) 159 if (memcmp(&minihdr, "minidump", 8) == 0) 160 return (_kvm_minidump_initvtop(kd)); 161 162 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); 163 if (kd->vmst == 0) { 164 _kvm_err(kd, kd->program, "cannot allocate vm"); 165 return (-1); 166 } 167 kd->vmst->PML4 = 0; 168 169 if (kd->rawdump == 0) { 170 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1) 171 return (-1); 172 173 ehdr = kd->vmst->mmapbase; 174 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 175 if (_kvm_maphdrs(kd, hdrsz) == -1) 176 return (-1); 177 } 178 179 nlist[0].n_name = "kernbase"; 180 nlist[1].n_name = 0; 181 182 if (kvm_nlist(kd, nlist) != 0) { 183 _kvm_err(kd, kd->program, "bad namelist - no kernbase"); 184 return (-1); 185 } 186 kernbase = nlist[0].n_value; 187 188 nlist[0].n_name = "KPML4phys"; 189 nlist[1].n_name = 0; 190 191 if (kvm_nlist(kd, nlist) != 0) { 192 _kvm_err(kd, kd->program, "bad namelist - no KPML4phys"); 193 return (-1); 194 } 195 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) != 196 sizeof(pa)) { 197 _kvm_err(kd, kd->program, "cannot read KPML4phys"); 198 return (-1); 199 } 200 PML4 = _kvm_malloc(kd, PAGE_SIZE); 201 if (kvm_read(kd, pa, PML4, PAGE_SIZE) != PAGE_SIZE) { 202 _kvm_err(kd, kd->program, "cannot read KPML4phys"); 203 return (-1); 204 } 205 kd->vmst->PML4 = PML4; 206 return (0); 207 } 208 209 static int 210 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa) 211 { 212 struct vmstate *vm; 213 u_long offset; 214 u_long pdpe_pa; 215 u_long pde_pa; 216 u_long pte_pa; 217 pml4_entry_t pml4e; 218 pdp_entry_t pdpe; 219 pd_entry_t pde; 220 pt_entry_t pte; 221 u_long pml4eindex; 222 u_long pdpeindex; 223 u_long pdeindex; 224 u_long pteindex; 225 int i; 226 u_long a; 227 off_t ofs; 228 size_t s; 229 230 vm = kd->vmst; 231 offset = va & (PAGE_SIZE - 1); 232 233 /* 234 * If we are initializing (kernel page table descriptor pointer 235 * not yet set) then return pa == va to avoid infinite recursion. 236 */ 237 if (vm->PML4 == 0) { 238 s = _kvm_pa2off(kd, va, pa); 239 if (s == 0) { 240 _kvm_err(kd, kd->program, 241 "_kvm_vatop: bootstrap data not in dump"); 242 goto invalid; 243 } else 244 return (PAGE_SIZE - offset); 245 } 246 247 pml4eindex = (va >> PML4SHIFT) & (NPML4EPG - 1); 248 pml4e = vm->PML4[pml4eindex]; 249 if (((u_long)pml4e & PG_V) == 0) { 250 _kvm_err(kd, kd->program, "_kvm_vatop: pml4e not valid"); 251 goto invalid; 252 } 253 254 pdpeindex = (va >> PDPSHIFT) & (NPDPEPG-1); 255 pdpe_pa = ((u_long)pml4e & PG_FRAME) + 256 (pdpeindex * sizeof(pdp_entry_t)); 257 258 s = _kvm_pa2off(kd, pdpe_pa, &ofs); 259 if (s < sizeof pdpe) { 260 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found"); 261 goto invalid; 262 } 263 if (lseek(kd->pmfd, ofs, 0) == -1) { 264 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek pdpe_pa"); 265 goto invalid; 266 } 267 if (read(kd->pmfd, &pdpe, sizeof pdpe) != sizeof pdpe) { 268 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pdpe"); 269 goto invalid; 270 } 271 if (((u_long)pdpe & PG_V) == 0) { 272 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe not valid"); 273 goto invalid; 274 } 275 276 pdeindex = (va >> PDRSHIFT) & (NPDEPG-1); 277 pde_pa = ((u_long)pdpe & PG_FRAME) + (pdeindex * sizeof(pd_entry_t)); 278 279 s = _kvm_pa2off(kd, pde_pa, &ofs); 280 if (s < sizeof pde) { 281 _kvm_syserr(kd, kd->program, "_kvm_vatop: pde_pa not found"); 282 goto invalid; 283 } 284 if (lseek(kd->pmfd, ofs, 0) == -1) { 285 _kvm_err(kd, kd->program, "_kvm_vatop: lseek pde_pa"); 286 goto invalid; 287 } 288 if (read(kd->pmfd, &pde, sizeof pde) != sizeof pde) { 289 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pde"); 290 goto invalid; 291 } 292 if (((u_long)pde & PG_V) == 0) { 293 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid"); 294 goto invalid; 295 } 296 297 if ((u_long)pde & PG_PS) { 298 /* 299 * No final-level page table; ptd describes one 2MB page. 300 */ 301 #define PAGE2M_MASK (NBPDR - 1) 302 #define PG_FRAME2M (~PAGE2M_MASK) 303 a = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK); 304 s = _kvm_pa2off(kd, a, pa); 305 if (s == 0) { 306 _kvm_err(kd, kd->program, 307 "_kvm_vatop: 2MB page address not in dump"); 308 goto invalid; 309 } else 310 return (NBPDR - (va & PAGE2M_MASK)); 311 } 312 313 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 314 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t)); 315 316 s = _kvm_pa2off(kd, pte_pa, &ofs); 317 if (s < sizeof pte) { 318 _kvm_err(kd, kd->program, "_kvm_vatop: pte_pa not found"); 319 goto invalid; 320 } 321 if (lseek(kd->pmfd, ofs, 0) == -1) { 322 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 323 goto invalid; 324 } 325 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 326 _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 327 goto invalid; 328 } 329 if (((u_long)pte & PG_V) == 0) { 330 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); 331 goto invalid; 332 } 333 334 a = ((u_long)pte & PG_FRAME) + offset; 335 s = _kvm_pa2off(kd, a, pa); 336 if (s == 0) { 337 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump"); 338 goto invalid; 339 } else 340 return (PAGE_SIZE - offset); 341 342 invalid: 343 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 344 return (0); 345 } 346 347 int 348 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 349 { 350 351 if (kd->vmst->minidump) 352 return (_kvm_minidump_kvatop(kd, va, pa)); 353 if (ISALIVE(kd)) { 354 _kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); 355 return (0); 356 } 357 return (_kvm_vatop(kd, va, pa)); 358 } 359