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 28 /* 29 * AMD64 machine dependent routines for kvm and minidumps. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/user.h> 34 #include <sys/proc.h> 35 #include <sys/stat.h> 36 #include <sys/mman.h> 37 #include <sys/fnv_hash.h> 38 #include <strings.h> 39 #include <string.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <nlist.h> 43 #include <kvm.h> 44 45 #include <vm/vm.h> 46 #include <vm/vm_param.h> 47 48 #include <machine/elf.h> 49 #include <machine/cpufunc.h> 50 #include <machine/minidump.h> 51 52 #include <limits.h> 53 54 #include "kvm_private.h" 55 56 struct hpte { 57 struct hpte *next; 58 vm_paddr_t pa; 59 int64_t off; 60 }; 61 62 #define HPT_SIZE 1024 63 64 /* minidump must be the first item! */ 65 struct vmstate { 66 int minidump; /* 1 = minidump mode */ 67 struct minidumphdr hdr; 68 void *hpt_head[HPT_SIZE]; 69 uint64_t *bitmap; 70 uint64_t *ptemap; 71 }; 72 73 static void 74 hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off) 75 { 76 struct hpte *hpte; 77 uint32_t fnv = FNV1_32_INIT; 78 79 fnv = fnv_32_buf(&pa, sizeof(pa), fnv); 80 fnv &= (HPT_SIZE - 1); 81 hpte = malloc(sizeof(*hpte)); 82 hpte->pa = pa; 83 hpte->off = off; 84 hpte->next = kd->vmst->hpt_head[fnv]; 85 kd->vmst->hpt_head[fnv] = hpte; 86 } 87 88 static int64_t 89 hpt_find(kvm_t *kd, vm_paddr_t pa) 90 { 91 struct hpte *hpte; 92 uint32_t fnv = FNV1_32_INIT; 93 94 fnv = fnv_32_buf(&pa, sizeof(pa), fnv); 95 fnv &= (HPT_SIZE - 1); 96 for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) { 97 if (pa == hpte->pa) 98 return (hpte->off); 99 } 100 return (-1); 101 } 102 103 static int 104 inithash(kvm_t *kd, uint64_t *base, int len, off_t off) 105 { 106 uint64_t idx; 107 uint64_t bit, bits; 108 vm_paddr_t pa; 109 110 for (idx = 0; idx < len / sizeof(*base); idx++) { 111 bits = base[idx]; 112 while (bits) { 113 bit = bsfq(bits); 114 bits &= ~(1ul << bit); 115 pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE; 116 hpt_insert(kd, pa, off); 117 off += PAGE_SIZE; 118 } 119 } 120 return (off); 121 } 122 123 void 124 _kvm_minidump_freevtop(kvm_t *kd) 125 { 126 struct vmstate *vm = kd->vmst; 127 128 if (vm->bitmap) 129 free(vm->bitmap); 130 if (vm->ptemap) 131 free(vm->ptemap); 132 free(vm); 133 kd->vmst = NULL; 134 } 135 136 int 137 _kvm_minidump_initvtop(kvm_t *kd) 138 { 139 struct vmstate *vmst; 140 off_t off; 141 142 vmst = _kvm_malloc(kd, sizeof(*vmst)); 143 if (vmst == 0) { 144 _kvm_err(kd, kd->program, "cannot allocate vm"); 145 return (-1); 146 } 147 kd->vmst = vmst; 148 bzero(vmst, sizeof(*vmst)); 149 vmst->minidump = 1; 150 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != 151 sizeof(vmst->hdr)) { 152 _kvm_err(kd, kd->program, "cannot read dump header"); 153 return (-1); 154 } 155 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) { 156 _kvm_err(kd, kd->program, "not a minidump for this platform"); 157 return (-1); 158 } 159 if (vmst->hdr.version != MINIDUMP_VERSION) { 160 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d", 161 MINIDUMP_VERSION, vmst->hdr.version); 162 return (-1); 163 } 164 165 /* Skip header and msgbuf */ 166 off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize); 167 168 vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); 169 if (vmst->bitmap == NULL) { 170 _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize); 171 return (-1); 172 } 173 if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) != 174 vmst->hdr.bitmapsize) { 175 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize); 176 return (-1); 177 } 178 off += round_page(vmst->hdr.bitmapsize); 179 180 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 181 if (vmst->ptemap == NULL) { 182 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize); 183 return (-1); 184 } 185 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 186 vmst->hdr.ptesize) { 187 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize); 188 return (-1); 189 } 190 off += vmst->hdr.ptesize; 191 192 /* build physical address hash table for sparse pages */ 193 inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off); 194 195 return (0); 196 } 197 198 static int 199 _kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa) 200 { 201 struct vmstate *vm; 202 u_long offset; 203 pt_entry_t pte; 204 u_long pteindex; 205 u_long a; 206 off_t ofs; 207 208 vm = kd->vmst; 209 offset = va & (PAGE_SIZE - 1); 210 211 if (va >= vm->hdr.kernbase) { 212 pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT; 213 pte = vm->ptemap[pteindex]; 214 if (((u_long)pte & PG_V) == 0) { 215 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid"); 216 goto invalid; 217 } 218 a = pte & PG_FRAME; 219 ofs = hpt_find(kd, a); 220 if (ofs == -1) { 221 _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a); 222 goto invalid; 223 } 224 *pa = ofs + offset; 225 return (PAGE_SIZE - offset); 226 } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) { 227 a = (va - vm->hdr.dmapbase) & ~PAGE_MASK; 228 ofs = hpt_find(kd, a); 229 if (ofs == -1) { 230 _kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va); 231 goto invalid; 232 } 233 *pa = ofs + offset; 234 return (PAGE_SIZE - offset); 235 } else { 236 _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va); 237 goto invalid; 238 } 239 240 invalid: 241 _kvm_err(kd, 0, "invalid address (0x%lx)", va); 242 return (0); 243 } 244 245 int 246 _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa) 247 { 248 if (kvm_ishost(kd)) { 249 _kvm_err(kd, 0, "kvm_vatop called in live kernel!"); 250 return((off_t)0); 251 } 252 253 return (_kvm_minidump_vatop(kd, va, pa)); 254 } 255