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 <unistd.h> 55 #include <nlist.h> 56 #include <kvm.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_param.h> 60 61 #include <machine/elf.h> 62 63 #include <limits.h> 64 65 #include "kvm_private.h" 66 67 #ifndef btop 68 #define btop(x) (amd64_btop(x)) 69 #define ptob(x) (amd64_ptob(x)) 70 #endif 71 72 /* minidump must be the first item! */ 73 struct vmstate { 74 int minidump; /* 1 = minidump mode */ 75 void *mmapbase; 76 size_t mmapsize; 77 pml4_entry_t *PML4; 78 }; 79 80 /* 81 * Map the ELF headers into the process' address space. We do this in two 82 * steps: first the ELF header itself and using that information the whole 83 * set of headers. (Taken from kvm_ia64.c) 84 */ 85 static int 86 _kvm_maphdrs(kvm_t *kd, size_t sz) 87 { 88 struct vmstate *vm = kd->vmst; 89 90 /* munmap() previous mmap(). */ 91 if (vm->mmapbase != NULL) { 92 munmap(vm->mmapbase, vm->mmapsize); 93 vm->mmapbase = NULL; 94 } 95 96 vm->mmapsize = sz; 97 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 98 if (vm->mmapbase == MAP_FAILED) { 99 _kvm_err(kd, kd->program, "cannot mmap corefile"); 100 return (-1); 101 } 102 return (0); 103 } 104 105 /* 106 * Translate a physical memory address to a file-offset in the crash-dump. 107 * (Taken from kvm_ia64.c) 108 */ 109 static size_t 110 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs) 111 { 112 Elf_Ehdr *e = kd->vmst->mmapbase; 113 Elf_Phdr *p; 114 int n; 115 116 if (kd->rawdump) { 117 *ofs = pa; 118 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 119 } 120 121 p = (Elf_Phdr*)((char*)e + e->e_phoff); 122 n = e->e_phnum; 123 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 124 p++, n--; 125 if (n == 0) 126 return (0); 127 *ofs = (pa - p->p_paddr) + p->p_offset; 128 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 129 } 130 131 void 132 _kvm_freevtop(kvm_t *kd) 133 { 134 struct vmstate *vm = kd->vmst; 135 136 if (kd->vmst->minidump) 137 return (_kvm_minidump_freevtop(kd)); 138 if (vm->mmapbase != NULL) 139 munmap(vm->mmapbase, vm->mmapsize); 140 if (vm->PML4) 141 free(vm->PML4); 142 free(vm); 143 kd->vmst = NULL; 144 } 145 146 int 147 _kvm_initvtop(kvm_t *kd) 148 { 149 struct nlist nlist[2]; 150 u_long pa; 151 u_long kernbase; 152 pml4_entry_t *PML4; 153 Elf_Ehdr *ehdr; 154 size_t hdrsz; 155 char minihdr[8]; 156 157 if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8) 158 if (memcmp(&minihdr, "minidump", 8) == 0) 159 return (_kvm_minidump_initvtop(kd)); 160 161 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); 162 if (kd->vmst == 0) { 163 _kvm_err(kd, kd->program, "cannot allocate vm"); 164 return (-1); 165 } 166 kd->vmst->PML4 = 0; 167 168 if (kd->rawdump == 0) { 169 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1) 170 return (-1); 171 172 ehdr = kd->vmst->mmapbase; 173 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 174 if (_kvm_maphdrs(kd, hdrsz) == -1) 175 return (-1); 176 } 177 178 nlist[0].n_name = "kernbase"; 179 nlist[1].n_name = 0; 180 181 if (kvm_nlist(kd, nlist) != 0) { 182 _kvm_err(kd, kd->program, "bad namelist - no kernbase"); 183 return (-1); 184 } 185 kernbase = nlist[0].n_value; 186 187 nlist[0].n_name = "KPML4phys"; 188 nlist[1].n_name = 0; 189 190 if (kvm_nlist(kd, nlist) != 0) { 191 _kvm_err(kd, kd->program, "bad namelist - no KPML4phys"); 192 return (-1); 193 } 194 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) != 195 sizeof(pa)) { 196 _kvm_err(kd, kd->program, "cannot read KPML4phys"); 197 return (-1); 198 } 199 PML4 = _kvm_malloc(kd, PAGE_SIZE); 200 if (kvm_read(kd, pa, PML4, PAGE_SIZE) != PAGE_SIZE) { 201 _kvm_err(kd, kd->program, "cannot read KPML4phys"); 202 return (-1); 203 } 204 kd->vmst->PML4 = PML4; 205 return (0); 206 } 207 208 static int 209 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa) 210 { 211 struct vmstate *vm; 212 u_long offset; 213 u_long pdpe_pa; 214 u_long pde_pa; 215 u_long pte_pa; 216 pml4_entry_t pml4e; 217 pdp_entry_t pdpe; 218 pd_entry_t pde; 219 pt_entry_t pte; 220 u_long pml4eindex; 221 u_long pdpeindex; 222 u_long pdeindex; 223 u_long pteindex; 224 int i; 225 u_long a; 226 off_t ofs; 227 size_t s; 228 229 vm = kd->vmst; 230 offset = va & (PAGE_SIZE - 1); 231 232 /* 233 * If we are initializing (kernel page table descriptor pointer 234 * not yet set) then return pa == va to avoid infinite recursion. 235 */ 236 if (vm->PML4 == 0) { 237 s = _kvm_pa2off(kd, va, pa); 238 if (s == 0) { 239 _kvm_err(kd, kd->program, 240 "_kvm_vatop: bootstrap data not in dump"); 241 goto invalid; 242 } else 243 return (PAGE_SIZE - offset); 244 } 245 246 pml4eindex = (va >> PML4SHIFT) & (NPML4EPG - 1); 247 pml4e = vm->PML4[pml4eindex]; 248 if (((u_long)pml4e & PG_V) == 0) { 249 _kvm_err(kd, kd->program, "_kvm_vatop: pml4e not valid"); 250 goto invalid; 251 } 252 253 pdpeindex = (va >> PDPSHIFT) & (NPDPEPG-1); 254 pdpe_pa = ((u_long)pml4e & PG_FRAME) + 255 (pdpeindex * sizeof(pdp_entry_t)); 256 257 s = _kvm_pa2off(kd, pdpe_pa, &ofs); 258 if (s < sizeof pdpe) { 259 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found"); 260 goto invalid; 261 } 262 if (lseek(kd->pmfd, ofs, 0) == -1) { 263 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek pdpe_pa"); 264 goto invalid; 265 } 266 if (read(kd->pmfd, &pdpe, sizeof pdpe) != sizeof pdpe) { 267 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pdpe"); 268 goto invalid; 269 } 270 if (((u_long)pdpe & PG_V) == 0) { 271 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe not valid"); 272 goto invalid; 273 } 274 275 pdeindex = (va >> PDRSHIFT) & (NPDEPG-1); 276 pde_pa = ((u_long)pdpe & PG_FRAME) + (pdeindex * sizeof(pd_entry_t)); 277 278 s = _kvm_pa2off(kd, pde_pa, &ofs); 279 if (s < sizeof pde) { 280 _kvm_syserr(kd, kd->program, "_kvm_vatop: pde_pa not found"); 281 goto invalid; 282 } 283 if (lseek(kd->pmfd, ofs, 0) == -1) { 284 _kvm_err(kd, kd->program, "_kvm_vatop: lseek pde_pa"); 285 goto invalid; 286 } 287 if (read(kd->pmfd, &pde, sizeof pde) != sizeof pde) { 288 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pde"); 289 goto invalid; 290 } 291 if (((u_long)pde & PG_V) == 0) { 292 _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid"); 293 goto invalid; 294 } 295 296 if ((u_long)pde & PG_PS) { 297 /* 298 * No final-level page table; ptd describes one 2MB page. 299 */ 300 #define PAGE2M_MASK (NBPDR - 1) 301 #define PG_FRAME2M (~PAGE2M_MASK) 302 a = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK); 303 s = _kvm_pa2off(kd, a, pa); 304 if (s == 0) { 305 _kvm_err(kd, kd->program, 306 "_kvm_vatop: 2MB page address not in dump"); 307 goto invalid; 308 } else 309 return (NBPDR - (va & PAGE2M_MASK)); 310 } 311 312 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 313 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t)); 314 315 s = _kvm_pa2off(kd, pte_pa, &ofs); 316 if (s < sizeof pte) { 317 _kvm_err(kd, kd->program, "_kvm_vatop: pte_pa not found"); 318 goto invalid; 319 } 320 if (lseek(kd->pmfd, ofs, 0) == -1) { 321 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 322 goto invalid; 323 } 324 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 325 _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 326 goto invalid; 327 } 328 if (((u_long)pte & PG_V) == 0) { 329 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); 330 goto invalid; 331 } 332 333 a = ((u_long)pte & PG_FRAME) + offset; 334 s = _kvm_pa2off(kd, a, pa); 335 if (s == 0) { 336 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump"); 337 goto invalid; 338 } else 339 return (PAGE_SIZE - offset); 340 341 invalid: 342 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 343 return (0); 344 } 345 346 int 347 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 348 { 349 350 if (kd->vmst->minidump) 351 return (_kvm_minidump_kvatop(kd, va, pa)); 352 if (ISALIVE(kd)) { 353 _kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); 354 return (0); 355 } 356 return (_kvm_vatop(kd, va, pa)); 357 } 358