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("$FreeBSD$"); 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 50 struct vmstate { 51 struct minidumphdr hdr; 52 void *ptemap; 53 }; 54 55 static int 56 _i386_minidump_probe(kvm_t *kd) 57 { 58 59 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) && 60 _kvm_is_minidump(kd)); 61 } 62 63 static void 64 _i386_minidump_freevtop(kvm_t *kd) 65 { 66 struct vmstate *vm = kd->vmst; 67 68 free(vm->ptemap); 69 free(vm); 70 kd->vmst = NULL; 71 } 72 73 static int 74 _i386_minidump_initvtop(kvm_t *kd) 75 { 76 struct vmstate *vmst; 77 off_t off, sparse_off; 78 79 vmst = _kvm_malloc(kd, sizeof(*vmst)); 80 if (vmst == NULL) { 81 _kvm_err(kd, kd->program, "cannot allocate vm"); 82 return (-1); 83 } 84 kd->vmst = vmst; 85 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != 86 sizeof(vmst->hdr)) { 87 _kvm_err(kd, kd->program, "cannot read dump header"); 88 return (-1); 89 } 90 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { 91 _kvm_err(kd, kd->program, "not a minidump for this platform"); 92 return (-1); 93 } 94 vmst->hdr.version = le32toh(vmst->hdr.version); 95 if (vmst->hdr.version != MINIDUMP_VERSION) { 96 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", 97 MINIDUMP_VERSION, vmst->hdr.version); 98 return (-1); 99 } 100 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize); 101 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize); 102 vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize); 103 vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase); 104 vmst->hdr.paemode = le32toh(vmst->hdr.paemode); 105 106 /* Skip header and msgbuf */ 107 off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize); 108 109 sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) + 110 i386_round_page(vmst->hdr.ptesize); 111 if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off, 112 I386_PAGE_SIZE, sizeof(uint32_t)) == -1) { 113 _kvm_err(kd, kd->program, "cannot load core bitmap"); 114 return (-1); 115 } 116 off += i386_round_page(vmst->hdr.bitmapsize); 117 118 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 119 if (vmst->ptemap == NULL) { 120 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize); 121 return (-1); 122 } 123 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 124 (ssize_t)vmst->hdr.ptesize) { 125 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize); 126 return (-1); 127 } 128 off += i386_round_page(vmst->hdr.ptesize); 129 130 return (0); 131 } 132 133 static int 134 _i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa) 135 { 136 struct vmstate *vm; 137 i386_physaddr_pae_t offset; 138 i386_pte_pae_t pte; 139 kvaddr_t pteindex; 140 i386_physaddr_pae_t a; 141 off_t ofs; 142 i386_pte_pae_t *ptemap; 143 144 vm = kd->vmst; 145 ptemap = vm->ptemap; 146 offset = va & I386_PAGE_MASK; 147 148 if (va >= vm->hdr.kernbase) { 149 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 150 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap)) 151 goto invalid; 152 pte = le64toh(ptemap[pteindex]); 153 if ((pte & I386_PG_V) == 0) { 154 _kvm_err(kd, kd->program, 155 "_i386_minidump_vatop_pae: pte not valid"); 156 goto invalid; 157 } 158 a = pte & I386_PG_FRAME_PAE; 159 ofs = _kvm_pt_find(kd, a); 160 if (ofs == -1) { 161 _kvm_err(kd, kd->program, 162 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump", 163 (uintmax_t)a); 164 goto invalid; 165 } 166 *pa = ofs + offset; 167 return (I386_PAGE_SIZE - offset); 168 } else { 169 _kvm_err(kd, kd->program, 170 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped", 171 (uintmax_t)va); 172 goto invalid; 173 } 174 175 invalid: 176 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 177 return (0); 178 } 179 180 static int 181 _i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 182 { 183 struct vmstate *vm; 184 i386_physaddr_t offset; 185 i386_pte_t pte; 186 kvaddr_t pteindex; 187 i386_physaddr_t a; 188 off_t ofs; 189 i386_pte_t *ptemap; 190 191 vm = kd->vmst; 192 ptemap = vm->ptemap; 193 offset = va & I386_PAGE_MASK; 194 195 if (va >= vm->hdr.kernbase) { 196 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT; 197 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap)) 198 goto invalid; 199 pte = le32toh(ptemap[pteindex]); 200 if ((pte & I386_PG_V) == 0) { 201 _kvm_err(kd, kd->program, 202 "_i386_minidump_vatop: pte not valid"); 203 goto invalid; 204 } 205 a = pte & I386_PG_FRAME; 206 ofs = _kvm_pt_find(kd, a); 207 if (ofs == -1) { 208 _kvm_err(kd, kd->program, 209 "_i386_minidump_vatop: physical address 0x%jx not in minidump", 210 (uintmax_t)a); 211 goto invalid; 212 } 213 *pa = ofs + offset; 214 return (I386_PAGE_SIZE - offset); 215 } else { 216 _kvm_err(kd, kd->program, 217 "_i386_minidump_vatop: virtual address 0x%jx not minidumped", 218 (uintmax_t)va); 219 goto invalid; 220 } 221 222 invalid: 223 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 224 return (0); 225 } 226 227 static int 228 _i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 229 { 230 231 if (ISALIVE(kd)) { 232 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!"); 233 return (0); 234 } 235 if (kd->vmst->hdr.paemode) 236 return (_i386_minidump_vatop_pae(kd, va, pa)); 237 else 238 return (_i386_minidump_vatop(kd, va, pa)); 239 } 240 241 static struct kvm_arch kvm_i386_minidump = { 242 .ka_probe = _i386_minidump_probe, 243 .ka_initvtop = _i386_minidump_initvtop, 244 .ka_freevtop = _i386_minidump_freevtop, 245 .ka_kvatop = _i386_minidump_kvatop, 246 .ka_native = _i386_native, 247 }; 248 249 KVM_ARCH(kvm_i386_minidump); 250