kvm_minidump_i386.c revision 298485
1/*- 2 * Copyright (c) 2006 Peter Wemm 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: head/lib/libkvm/kvm_minidump_i386.c 298485 2016-04-22 18:05:34Z ngie $"); 28 29/* 30 * i386 machine dependent routines for kvm and minidumps. 31 */ 32 33#include <sys/param.h> 34#include <sys/endian.h> 35#include <stdint.h> 36#include <stdlib.h> 37#include <string.h> 38#include <unistd.h> 39#include <kvm.h> 40 41#include "../../sys/i386/include/minidump.h" 42 43#include <limits.h> 44 45#include "kvm_private.h" 46#include "kvm_i386.h" 47 48#define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE) 49 50struct vmstate { 51 struct minidumphdr hdr; 52 struct hpt hpt; 53 void *ptemap; 54}; 55 56static int 57_i386_minidump_probe(kvm_t *kd) 58{ 59 60 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && 61 _kvm_is_minidump(kd)); 62} 63 64static void 65_i386_minidump_freevtop(kvm_t *kd) 66{ 67 struct vmstate *vm = kd->vmst; 68 69 _kvm_hpt_free(&vm->hpt); 70 if (vm->ptemap) 71 free(vm->ptemap); 72 free(vm); 73 kd->vmst = NULL; 74} 75 76static int 77_i386_minidump_initvtop(kvm_t *kd) 78{ 79 struct vmstate *vmst; 80 uint32_t *bitmap; 81 off_t off; 82 83 vmst = _kvm_malloc(kd, sizeof(*vmst)); 84 if (vmst == NULL) { 85 _kvm_err(kd, kd->program, "cannot allocate vm"); 86 return (-1); 87 } 88 kd->vmst = vmst; 89 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != 90 sizeof(vmst->hdr)) { 91 _kvm_err(kd, kd->program, "cannot read dump header"); 92 return (-1); 93 } 94 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { 95 _kvm_err(kd, kd->program, "not a minidump for this platform"); 96 return (-1); 97 } 98 vmst->hdr.version = le32toh(vmst->hdr.version); 99 if (vmst->hdr.version != MINIDUMP_VERSION) { 100 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", 101 MINIDUMP_VERSION, vmst->hdr.version); 102 return (-1); 103 } 104 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize); 105 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize); 106 vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize); 107 vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase); 108 vmst->hdr.paemode = le32toh(vmst->hdr.paemode); 109 110 /* Skip header and msgbuf */ 111 off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize); 112 113 bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); 114 if (bitmap == NULL) { 115 _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize); 116 return (-1); 117 } 118 if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) != 119 (ssize_t)vmst->hdr.bitmapsize) { 120 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize); 121 free(bitmap); 122 return (-1); 123 } 124 off += i386_round_page(vmst->hdr.bitmapsize); 125 126 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 127 if (vmst->ptemap == NULL) { 128 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize); 129 free(bitmap); 130 return (-1); 131 } 132 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 133 (ssize_t)vmst->hdr.ptesize) { 134 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize); 135 free(bitmap); 136 return (-1); 137 } 138 off += vmst->hdr.ptesize; 139 140 /* build physical address hash table for sparse pages */ 141 _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off, 142 I386_PAGE_SIZE, sizeof(*bitmap)); 143 free(bitmap); 144 145 return (0); 146} 147 148static int 149_i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) 150{ 151 struct vmstate *vm; 152 i386_physaddr_pae_t offset; 153 i386_pte_pae_t pte; 154 kvaddr_t pteindex; 155 i386_physaddr_pae_t a; 156 off_t ofs; 157 i386_pte_pae_t *ptemap; 158 159 vm = kd->vmst; 160 ptemap = vm->ptemap; 161 offset = va & I386_PAGE_MASK; 162 163 if (va >= vm->hdr.kernbase) { 164 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 165 pte = le64toh(ptemap[pteindex]); 166 if ((pte & I386_PG_V) == 0) { 167 _kvm_err(kd, kd->program, 168 "_i386_minidump_vatop_pae: pte not valid"); 169 goto invalid; 170 } 171 a = pte & I386_PG_FRAME_PAE; 172 ofs = _kvm_hpt_find(&vm->hpt, a); 173 if (ofs == -1) { 174 _kvm_err(kd, kd->program, 175 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump", 176 (uintmax_t)a); 177 goto invalid; 178 } 179 *pa = ofs + offset; 180 return (I386_PAGE_SIZE - offset); 181 } else { 182 _kvm_err(kd, kd->program, 183 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped", 184 (uintmax_t)va); 185 goto invalid; 186 } 187 188invalid: 189 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 190 return (0); 191} 192 193static int 194_i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 195{ 196 struct vmstate *vm; 197 i386_physaddr_t offset; 198 i386_pte_t pte; 199 kvaddr_t pteindex; 200 i386_physaddr_t a; 201 off_t ofs; 202 i386_pte_t *ptemap; 203 204 vm = kd->vmst; 205 ptemap = vm->ptemap; 206 offset = va & I386_PAGE_MASK; 207 208 if (va >= vm->hdr.kernbase) { 209 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 210 pte = le32toh(ptemap[pteindex]); 211 if ((pte & I386_PG_V) == 0) { 212 _kvm_err(kd, kd->program, 213 "_i386_minidump_vatop: pte not valid"); 214 goto invalid; 215 } 216 a = pte & I386_PG_FRAME; 217 ofs = _kvm_hpt_find(&vm->hpt, a); 218 if (ofs == -1) { 219 _kvm_err(kd, kd->program, 220 "_i386_minidump_vatop: physical address 0x%jx not in minidump", 221 (uintmax_t)a); 222 goto invalid; 223 } 224 *pa = ofs + offset; 225 return (I386_PAGE_SIZE - offset); 226 } else { 227 _kvm_err(kd, kd->program, 228 "_i386_minidump_vatop: virtual address 0x%jx not minidumped", 229 (uintmax_t)va); 230 goto invalid; 231 } 232 233invalid: 234 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 235 return (0); 236} 237 238static int 239_i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 240{ 241 242 if (ISALIVE(kd)) { 243 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!"); 244 return (0); 245 } 246 if (kd->vmst->hdr.paemode) 247 return (_i386_minidump_vatop_pae(kd, va, pa)); 248 else 249 return (_i386_minidump_vatop(kd, va, pa)); 250} 251 252struct kvm_arch kvm_i386_minidump = { 253 .ka_probe = _i386_minidump_probe, 254 .ka_initvtop = _i386_minidump_initvtop, 255 .ka_freevtop = _i386_minidump_freevtop, 256 .ka_kvatop = _i386_minidump_kvatop, 257 .ka_native = _i386_native, 258}; 259 260KVM_ARCH(kvm_i386_minidump); 261