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 = (Elf_Phdr*)((char*)e + e->e_phoff); 114 int n = e->e_phnum; 115 116 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 117 p++, n--; 118 if (n == 0) 119 return (0); 120 *ofs = (pa - p->p_paddr) + p->p_offset; 121 return (PAGE_SIZE - ((size_t)pa & PAGE_MASK)); 122 } 123 124 void 125 _kvm_freevtop(kvm_t *kd) 126 { 127 struct vmstate *vm = kd->vmst; 128 129 if (kd->vmst->minidump) 130 return (_kvm_minidump_freevtop(kd)); 131 if (vm->mmapbase != NULL) 132 munmap(vm->mmapbase, vm->mmapsize); 133 if (vm->PML4) 134 free(vm->PML4); 135 free(vm); 136 kd->vmst = NULL; 137 } 138 139 int 140 _kvm_initvtop(kvm_t *kd) 141 { 142 struct nlist nlist[2]; 143 u_long pa; 144 u_long kernbase; 145 pml4_entry_t *PML4; 146 Elf_Ehdr *ehdr; 147 size_t hdrsz; 148 char minihdr[8]; 149 150 if (pread(kd->pmfd, &minihdr, 8, 0) == 8) 151 if (memcmp(&minihdr, "minidump", 8) == 0) 152 return (_kvm_minidump_initvtop(kd)); 153 154 kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); 155 if (kd->vmst == 0) { 156 _kvm_err(kd, kd->program, "cannot allocate vm"); 157 return (-1); 158 } 159 kd->vmst->PML4 = 0; 160 161 if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1) 162 return (-1); 163 164 ehdr = kd->vmst->mmapbase; 165 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 166 if (_kvm_maphdrs(kd, hdrsz) == -1) 167 return (-1); 168 169 nlist[0].n_name = "kernbase"; 170 nlist[1].n_name = 0; 171 172 if (kvm_nlist(kd, nlist) != 0) { 173 _kvm_err(kd, kd->program, "bad namelist - no kernbase"); 174 return (-1); 175 } 176 kernbase = nlist[0].n_value; 177 178 nlist[0].n_name = "KPML4phys"; 179 nlist[1].n_name = 0; 180 181 if (kvm_nlist(kd, nlist) != 0) { 182 _kvm_err(kd, kd->program, "bad namelist - no KPML4phys"); 183 return (-1); 184 } 185 if (kvm_read(kd, (nlist[0].n_value - kernbase), &pa, sizeof(pa)) != 186 sizeof(pa)) { 187 _kvm_err(kd, kd->program, "cannot read KPML4phys"); 188 return (-1); 189 } 190 PML4 = _kvm_malloc(kd, PAGE_SIZE); 191 if (kvm_read(kd, pa, PML4, PAGE_SIZE) != PAGE_SIZE) { 192 _kvm_err(kd, kd->program, "cannot read KPML4phys"); 193 return (-1); 194 } 195 kd->vmst->PML4 = PML4; 196 return (0); 197 } 198 199 static int 200 _kvm_vatop(kvm_t *kd, u_long va, off_t *pa) 201 { 202 struct vmstate *vm; 203 u_long offset; 204 u_long pdpe_pa; 205 u_long pde_pa; 206 u_long pte_pa; 207 pml4_entry_t pml4e; 208 pdp_entry_t pdpe; 209 pd_entry_t pde; 210 pt_entry_t pte; 211 u_long pml4eindex; 212 u_long pdpeindex; 213 u_long pdeindex; 214 u_long pteindex; 215 int i; 216 u_long a; 217 off_t ofs; 218 size_t s; 219 220 vm = kd->vmst; 221 offset = va & (PAGE_SIZE - 1); 222 223 /* 224 * If we are initializing (kernel page table descriptor pointer 225 * not yet set) then return pa == va to avoid infinite recursion. 226 */ 227 if (vm->PML4 == 0) { 228 s = _kvm_pa2off(kd, va, pa); 229 if (s == 0) { 230 _kvm_err(kd, kd->program, 231 "_kvm_vatop: bootstrap data not in dump"); 232 goto invalid; 233 } else 234 return (PAGE_SIZE - offset); 235 } 236 237 pml4eindex = (va >> PML4SHIFT) & (NPML4EPG - 1); 238 pml4e = vm->PML4[pml4eindex]; 239 if (((u_long)pml4e & PG_V) == 0) { 240 _kvm_err(kd, kd->program, "_kvm_vatop: pml4e not valid"); 241 goto invalid; 242 } 243 244 pdpeindex = (va >> PDPSHIFT) & (NPDPEPG-1); 245 pdpe_pa = ((u_long)pml4e & PG_FRAME) + 246 (pdpeindex * sizeof(pdp_entry_t)); 247 248 s = _kvm_pa2off(kd, pdpe_pa, &ofs); 249 if (s < sizeof pdpe) { 250 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found"); 251 goto invalid; 252 } 253 if (lseek(kd->pmfd, ofs, 0) == -1) { 254 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek pdpe_pa"); 255 goto invalid; 256 } 257 if (read(kd->pmfd, &pdpe, sizeof pdpe) != sizeof pdpe) { 258 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pdpe"); 259 goto invalid; 260 } 261 if (((u_long)pdpe & PG_V) == 0) { 262 _kvm_err(kd, kd->program, "_kvm_vatop: pdpe not valid"); 263 goto invalid; 264 } 265 266 pdeindex = (va >> PDRSHIFT) & (NPDEPG-1); 267 pde_pa = ((u_long)pdpe & PG_FRAME) + (pdeindex * sizeof(pd_entry_t)); 268 269 s = _kvm_pa2off(kd, pde_pa, &ofs); 270 if (s < sizeof pde) { 271 _kvm_syserr(kd, kd->program, "_kvm_vatop: pde_pa not found"); 272 goto invalid; 273 } 274 if (lseek(kd->pmfd, ofs, 0) == -1) { 275 _kvm_err(kd, kd->program, "_kvm_vatop: lseek pde_pa"); 276 goto invalid; 277 } 278 if (read(kd->pmfd, &pde, sizeof pde) != sizeof pde) { 279 _kvm_syserr(kd, kd->program, "_kvm_vatop: read pde"); 280 goto invalid; 281 } 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 final-level page table; ptd describes one 2MB page. 290 */ 291 #define PAGE2M_MASK (NBPDR - 1) 292 #define PG_FRAME2M (~PAGE2M_MASK) 293 a = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK); 294 s = _kvm_pa2off(kd, a, pa); 295 if (s == 0) { 296 _kvm_err(kd, kd->program, 297 "_kvm_vatop: 2MB page address not in dump"); 298 goto invalid; 299 } else 300 return (NBPDR - (va & PAGE2M_MASK)); 301 } 302 303 pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1); 304 pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t)); 305 306 s = _kvm_pa2off(kd, pte_pa, &ofs); 307 if (s < sizeof pte) { 308 _kvm_err(kd, kd->program, "_kvm_vatop: pte_pa not found"); 309 goto invalid; 310 } 311 if (lseek(kd->pmfd, ofs, 0) == -1) { 312 _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek"); 313 goto invalid; 314 } 315 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 316 _kvm_syserr(kd, kd->program, "_kvm_vatop: read"); 317 goto invalid; 318 } 319 if (((u_long)pte & PG_V) == 0) { 320 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); 321 goto invalid; 322 } 323 324 a = ((u_long)pte & PG_FRAME) + offset; 325 s = _kvm_pa2off(kd, a, pa); 326 if (s == 0) { 327 _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump"); 328 goto invalid; 329 } else 330 return (PAGE_SIZE - offset); 331 332 invalid: 333 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 334 return (0); 335 } 336 337 int 338 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 339 { 340 341 if (kd->vmst->minidump) 342 return (_kvm_minidump_kvatop(kd, va, pa)); 343 if (ISALIVE(kd)) { 344 _kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); 345 return (0); 346 } 347 return (_kvm_vatop(kd, va, pa)); 348 } 349