1 /*- 2 * Copyright (c) 2008 Semihalf, Grzegorz Bernacki 3 * Copyright (c) 2006 Peter Wemm 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * From: FreeBSD: src/lib/libkvm/kvm_minidump_i386.c,v 1.2 2006/06/05 08:51:14 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 /* 33 * ARM machine dependent routines for kvm and minidumps. 34 */ 35 36 #include <sys/param.h> 37 #ifndef CROSS_LIBKVM 38 #include <sys/user.h> 39 #endif 40 #include <sys/proc.h> 41 #include <sys/stat.h> 42 #include <sys/mman.h> 43 #include <sys/fnv_hash.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <unistd.h> 47 #include <nlist.h> 48 #include <kvm.h> 49 50 #ifndef CROSS_LIBKVM 51 #include <vm/vm.h> 52 #include <vm/vm_param.h> 53 54 #include <machine/elf.h> 55 #include <machine/cpufunc.h> 56 #include <machine/minidump.h> 57 #else 58 #include "../../sys/arm/include/pte.h" 59 #include "../../sys/arm/include/vmparam.h" 60 #include "../../sys/arm/include/minidump.h" 61 #endif 62 63 #include <limits.h> 64 65 #include "kvm_private.h" 66 67 struct hpte { 68 struct hpte *next; 69 uint64_t pa; 70 int64_t off; 71 }; 72 73 #define HPT_SIZE 1024 74 75 /* minidump must be the first field */ 76 struct vmstate { 77 int minidump; /* 1 = minidump mode */ 78 struct minidumphdr hdr; 79 void *hpt_head[HPT_SIZE]; 80 uint32_t *bitmap; 81 void *ptemap; 82 }; 83 84 static void 85 hpt_insert(kvm_t *kd, uint64_t pa, int64_t off) 86 { 87 struct hpte *hpte; 88 uint32_t fnv = FNV1_32_INIT; 89 90 fnv = fnv_32_buf(&pa, sizeof(pa), fnv); 91 fnv &= (HPT_SIZE - 1); 92 hpte = malloc(sizeof(*hpte)); 93 hpte->pa = pa; 94 hpte->off = off; 95 hpte->next = kd->vmst->hpt_head[fnv]; 96 kd->vmst->hpt_head[fnv] = hpte; 97 } 98 99 static int64_t 100 hpt_find(kvm_t *kd, uint64_t pa) 101 { 102 struct hpte *hpte; 103 uint32_t fnv = FNV1_32_INIT; 104 105 fnv = fnv_32_buf(&pa, sizeof(pa), fnv); 106 fnv &= (HPT_SIZE - 1); 107 for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) 108 if (pa == hpte->pa) 109 return (hpte->off); 110 111 return (-1); 112 } 113 114 static int 115 inithash(kvm_t *kd, uint32_t *base, int len, off_t off) 116 { 117 uint64_t idx, pa; 118 uint32_t bit, bits; 119 120 for (idx = 0; idx < len / sizeof(*base); idx++) { 121 bits = base[idx]; 122 while (bits) { 123 bit = ffs(bits) - 1; 124 bits &= ~(1ul << bit); 125 pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE; 126 hpt_insert(kd, pa, off); 127 off += PAGE_SIZE; 128 } 129 } 130 return (off); 131 } 132 133 void 134 _kvm_minidump_freevtop(kvm_t *kd) 135 { 136 struct vmstate *vm = kd->vmst; 137 138 if (vm->bitmap) 139 free(vm->bitmap); 140 if (vm->ptemap) 141 free(vm->ptemap); 142 free(vm); 143 kd->vmst = NULL; 144 } 145 146 int 147 _kvm_minidump_initvtop(kvm_t *kd) 148 { 149 struct vmstate *vmst; 150 off_t off; 151 152 vmst = _kvm_malloc(kd, sizeof(*vmst)); 153 if (vmst == 0) { 154 _kvm_err(kd, kd->program, "cannot allocate vm"); 155 return (-1); 156 } 157 158 kd->vmst = vmst; 159 vmst->minidump = 1; 160 161 if (pread(kd->pmfd, &vmst->hdr, 162 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { 163 _kvm_err(kd, kd->program, "cannot read dump header"); 164 return (-1); 165 } 166 167 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, 168 sizeof(vmst->hdr.magic)) != 0) { 169 _kvm_err(kd, kd->program, "not a minidump for this platform"); 170 return (-1); 171 } 172 if (vmst->hdr.version != MINIDUMP_VERSION) { 173 _kvm_err(kd, kd->program, "wrong minidump version. " 174 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); 175 return (-1); 176 } 177 178 /* Skip header and msgbuf */ 179 off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize); 180 181 vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); 182 if (vmst->bitmap == NULL) { 183 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 184 "bitmap", vmst->hdr.bitmapsize); 185 return (-1); 186 } 187 188 if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) != 189 (ssize_t)vmst->hdr.bitmapsize) { 190 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", 191 vmst->hdr.bitmapsize); 192 return (-1); 193 } 194 off += round_page(vmst->hdr.bitmapsize); 195 196 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 197 if (vmst->ptemap == NULL) { 198 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 199 "ptemap", vmst->hdr.ptesize); 200 return (-1); 201 } 202 203 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 204 (ssize_t)vmst->hdr.ptesize) { 205 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", 206 vmst->hdr.ptesize); 207 return (-1); 208 } 209 210 off += vmst->hdr.ptesize; 211 212 /* Build physical address hash table for sparse pages */ 213 inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off); 214 215 return (0); 216 } 217 218 int 219 _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa) 220 { 221 struct vmstate *vm; 222 pt_entry_t pte; 223 u_long offset, pteindex, a; 224 off_t ofs; 225 uint32_t *ptemap; 226 227 if (ISALIVE(kd)) { 228 _kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); 229 return (0); 230 } 231 232 vm = kd->vmst; 233 ptemap = vm->ptemap; 234 235 if (va >= vm->hdr.kernbase) { 236 pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT; 237 pte = ptemap[pteindex]; 238 if (!pte) { 239 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); 240 goto invalid; 241 } 242 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { 243 offset = va & L2_L_OFFSET; 244 a = pte & L2_L_FRAME; 245 } else if ((pte & L2_TYPE_MASK) == L2_TYPE_S) { 246 offset = va & L2_S_OFFSET; 247 a = pte & L2_S_FRAME; 248 } else 249 goto invalid; 250 251 ofs = hpt_find(kd, a); 252 if (ofs == -1) { 253 _kvm_err(kd, kd->program, "_kvm_vatop: physical " 254 "address 0x%lx not in minidump", a); 255 goto invalid; 256 } 257 258 *pa = ofs + offset; 259 return (PAGE_SIZE - offset); 260 261 } else 262 _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx " 263 "not minidumped", va); 264 265 invalid: 266 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 267 return (0); 268 } 269