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 #include <sys/user.h> 38 #include <sys/proc.h> 39 #include <sys/stat.h> 40 #include <sys/mman.h> 41 #include <sys/fnv_hash.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <nlist.h> 46 #include <kvm.h> 47 48 #include <vm/vm.h> 49 #include <vm/vm_param.h> 50 51 #include <machine/elf.h> 52 #include <machine/cpufunc.h> 53 #include <machine/minidump.h> 54 55 #include <limits.h> 56 57 #include "kvm_private.h" 58 59 struct hpte { 60 struct hpte *next; 61 uint64_t pa; 62 int64_t off; 63 }; 64 65 #define HPT_SIZE 1024 66 67 /* minidump must be the first field */ 68 struct vmstate { 69 int minidump; /* 1 = minidump mode */ 70 struct minidumphdr hdr; 71 void *hpt_head[HPT_SIZE]; 72 uint32_t *bitmap; 73 void *ptemap; 74 }; 75 76 static void 77 hpt_insert(kvm_t *kd, uint64_t pa, int64_t off) 78 { 79 struct hpte *hpte; 80 uint32_t fnv = FNV1_32_INIT; 81 82 fnv = fnv_32_buf(&pa, sizeof(pa), fnv); 83 fnv &= (HPT_SIZE - 1); 84 hpte = malloc(sizeof(*hpte)); 85 hpte->pa = pa; 86 hpte->off = off; 87 hpte->next = kd->vmst->hpt_head[fnv]; 88 kd->vmst->hpt_head[fnv] = hpte; 89 } 90 91 static int64_t 92 hpt_find(kvm_t *kd, uint64_t pa) 93 { 94 struct hpte *hpte; 95 uint32_t fnv = FNV1_32_INIT; 96 97 fnv = fnv_32_buf(&pa, sizeof(pa), fnv); 98 fnv &= (HPT_SIZE - 1); 99 for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) 100 if (pa == hpte->pa) 101 return (hpte->off); 102 103 return (-1); 104 } 105 106 static int 107 inithash(kvm_t *kd, uint32_t *base, int len, off_t off) 108 { 109 uint64_t idx, pa; 110 uint32_t bit, bits; 111 112 for (idx = 0; idx < len / sizeof(*base); idx++) { 113 bits = base[idx]; 114 while (bits) { 115 bit = ffs(bits) - 1; 116 bits &= ~(1ul << bit); 117 pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE; 118 hpt_insert(kd, pa, off); 119 off += PAGE_SIZE; 120 } 121 } 122 return (off); 123 } 124 125 void 126 _kvm_minidump_freevtop(kvm_t *kd) 127 { 128 struct vmstate *vm = kd->vmst; 129 130 if (vm->bitmap) 131 free(vm->bitmap); 132 if (vm->ptemap) 133 free(vm->ptemap); 134 free(vm); 135 kd->vmst = NULL; 136 } 137 138 int 139 _kvm_minidump_initvtop(kvm_t *kd) 140 { 141 struct vmstate *vmst; 142 off_t off; 143 144 vmst = _kvm_malloc(kd, sizeof(*vmst)); 145 if (vmst == 0) { 146 _kvm_err(kd, kd->program, "cannot allocate vm"); 147 return (-1); 148 } 149 150 kd->vmst = vmst; 151 vmst->minidump = 1; 152 153 if (pread(kd->pmfd, &vmst->hdr, 154 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { 155 _kvm_err(kd, kd->program, "cannot read dump header"); 156 return (-1); 157 } 158 159 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, 160 sizeof(vmst->hdr.magic)) != 0) { 161 _kvm_err(kd, kd->program, "not a minidump for this platform"); 162 return (-1); 163 } 164 if (vmst->hdr.version != MINIDUMP_VERSION) { 165 _kvm_err(kd, kd->program, "wrong minidump version. " 166 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); 167 return (-1); 168 } 169 170 /* Skip header and msgbuf */ 171 off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize); 172 173 vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); 174 if (vmst->bitmap == NULL) { 175 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 176 "bitmap", vmst->hdr.bitmapsize); 177 return (-1); 178 } 179 180 if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) != 181 (ssize_t)vmst->hdr.bitmapsize) { 182 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", 183 vmst->hdr.bitmapsize); 184 return (-1); 185 } 186 off += round_page(vmst->hdr.bitmapsize); 187 188 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 189 if (vmst->ptemap == NULL) { 190 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 191 "ptemap", vmst->hdr.ptesize); 192 return (-1); 193 } 194 195 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 196 (ssize_t)vmst->hdr.ptesize) { 197 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", 198 vmst->hdr.ptesize); 199 return (-1); 200 } 201 202 off += vmst->hdr.ptesize; 203 204 /* Build physical address hash table for sparse pages */ 205 inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off); 206 207 return (0); 208 } 209 210 int 211 _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa) 212 { 213 struct vmstate *vm; 214 pt_entry_t pte; 215 u_long offset, pteindex, a; 216 off_t ofs; 217 uint32_t *ptemap; 218 219 if (ISALIVE(kd)) { 220 _kvm_err(kd, 0, "kvm_kvatop called in live kernel!"); 221 return (0); 222 } 223 224 vm = kd->vmst; 225 ptemap = vm->ptemap; 226 227 if (va >= vm->hdr.kernbase) { 228 pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT; 229 pte = ptemap[pteindex]; 230 if (!pte) { 231 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); 232 goto invalid; 233 } 234 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { 235 offset = va & L2_L_OFFSET; 236 a = pte & L2_L_FRAME; 237 } else if ((pte & L2_TYPE_MASK) == L2_TYPE_S) { 238 offset = va & L2_S_OFFSET; 239 a = pte & L2_S_FRAME; 240 } else 241 goto invalid; 242 243 ofs = hpt_find(kd, a); 244 if (ofs == -1) { 245 _kvm_err(kd, kd->program, "_kvm_vatop: physical " 246 "address 0x%lx not in minidump", a); 247 goto invalid; 248 } 249 250 *pa = ofs + offset; 251 return (PAGE_SIZE - offset); 252 253 } else 254 _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx " 255 "not minidumped", va); 256 257 invalid: 258 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 259 return (0); 260 } 261