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 * From: FreeBSD: src/lib/libkvm/kvm_minidump_amd64.c r261799 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 /* 32 * ARM64 (AArch64) machine dependent routines for kvm and minidumps. 33 */ 34 35 #include <sys/param.h> 36 #include <stdint.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 #include <vm/vm.h> 41 #include <kvm.h> 42 43 #include "../../sys/arm64/include/minidump.h" 44 45 #include <limits.h> 46 47 #include "kvm_private.h" 48 #include "kvm_aarch64.h" 49 50 #define aarch64_round_page(x) roundup2((kvaddr_t)(x), AARCH64_PAGE_SIZE) 51 52 struct vmstate { 53 struct minidumphdr hdr; 54 }; 55 56 static aarch64_pte_t 57 _aarch64_pte_get(kvm_t *kd, u_long pteindex) 58 { 59 aarch64_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte)); 60 61 return le64toh(*pte); 62 } 63 64 static int 65 _aarch64_minidump_probe(kvm_t *kd) 66 { 67 68 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_AARCH64) && 69 _kvm_is_minidump(kd)); 70 } 71 72 static void 73 _aarch64_minidump_freevtop(kvm_t *kd) 74 { 75 struct vmstate *vm = kd->vmst; 76 77 free(vm); 78 kd->vmst = NULL; 79 } 80 81 static int 82 _aarch64_minidump_initvtop(kvm_t *kd) 83 { 84 struct vmstate *vmst; 85 off_t off, dump_avail_off, sparse_off; 86 87 vmst = _kvm_malloc(kd, sizeof(*vmst)); 88 if (vmst == NULL) { 89 _kvm_err(kd, kd->program, "cannot allocate vm"); 90 return (-1); 91 } 92 kd->vmst = vmst; 93 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) != 94 sizeof(vmst->hdr)) { 95 _kvm_err(kd, kd->program, "cannot read dump header"); 96 return (-1); 97 } 98 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, 99 sizeof(vmst->hdr.magic)) != 0) { 100 _kvm_err(kd, kd->program, "not a minidump for this platform"); 101 return (-1); 102 } 103 104 vmst->hdr.version = le32toh(vmst->hdr.version); 105 if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) { 106 _kvm_err(kd, kd->program, "wrong minidump version. " 107 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); 108 return (-1); 109 } 110 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize); 111 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize); 112 vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize); 113 vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase); 114 vmst->hdr.dmapphys = le64toh(vmst->hdr.dmapphys); 115 vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase); 116 vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend); 117 vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ? 118 le32toh(vmst->hdr.dumpavailsize) : 0; 119 120 /* Skip header and msgbuf */ 121 dump_avail_off = AARCH64_PAGE_SIZE + aarch64_round_page(vmst->hdr.msgbufsize); 122 123 /* Skip dump_avail */ 124 off = dump_avail_off + aarch64_round_page(vmst->hdr.dumpavailsize); 125 126 /* build physical address lookup table for sparse pages */ 127 sparse_off = off + aarch64_round_page(vmst->hdr.bitmapsize) + 128 aarch64_round_page(vmst->hdr.pmapsize); 129 if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off, 130 vmst->hdr.bitmapsize, off, sparse_off, AARCH64_PAGE_SIZE) == -1) { 131 return (-1); 132 } 133 off += aarch64_round_page(vmst->hdr.bitmapsize); 134 135 if (_kvm_pmap_init(kd, vmst->hdr.pmapsize, off) == -1) { 136 return (-1); 137 } 138 off += aarch64_round_page(vmst->hdr.pmapsize); 139 140 return (0); 141 } 142 143 static int 144 _aarch64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa) 145 { 146 struct vmstate *vm; 147 aarch64_physaddr_t offset; 148 aarch64_pte_t l3; 149 kvaddr_t l3_index; 150 aarch64_physaddr_t a; 151 off_t ofs; 152 153 vm = kd->vmst; 154 offset = va & AARCH64_PAGE_MASK; 155 156 if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) { 157 a = (va - vm->hdr.dmapbase + vm->hdr.dmapphys) & 158 ~AARCH64_PAGE_MASK; 159 ofs = _kvm_pt_find(kd, a, AARCH64_PAGE_SIZE); 160 if (ofs == -1) { 161 _kvm_err(kd, kd->program, "_aarch64_minidump_vatop: " 162 "direct map address 0x%jx not in minidump", 163 (uintmax_t)va); 164 goto invalid; 165 } 166 *pa = ofs + offset; 167 return (AARCH64_PAGE_SIZE - offset); 168 } else if (va >= vm->hdr.kernbase) { 169 l3_index = (va - vm->hdr.kernbase) >> AARCH64_L3_SHIFT; 170 if (l3_index >= vm->hdr.pmapsize / sizeof(l3)) 171 goto invalid; 172 l3 = _aarch64_pte_get(kd, l3_index); 173 if ((l3 & AARCH64_ATTR_DESCR_MASK) != AARCH64_L3_PAGE) { 174 _kvm_err(kd, kd->program, 175 "_aarch64_minidump_vatop: pde not valid"); 176 goto invalid; 177 } 178 a = l3 & ~AARCH64_ATTR_MASK; 179 ofs = _kvm_pt_find(kd, a, AARCH64_PAGE_SIZE); 180 if (ofs == -1) { 181 _kvm_err(kd, kd->program, "_aarch64_minidump_vatop: " 182 "physical address 0x%jx not in minidump", 183 (uintmax_t)a); 184 goto invalid; 185 } 186 *pa = ofs + offset; 187 return (AARCH64_PAGE_SIZE - offset); 188 } else { 189 _kvm_err(kd, kd->program, 190 "_aarch64_minidump_vatop: virtual address 0x%jx not minidumped", 191 (uintmax_t)va); 192 goto invalid; 193 } 194 195 invalid: 196 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 197 return (0); 198 } 199 200 static int 201 _aarch64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 202 { 203 204 if (ISALIVE(kd)) { 205 _kvm_err(kd, 0, 206 "_aarch64_minidump_kvatop called in live kernel!"); 207 return (0); 208 } 209 return (_aarch64_minidump_vatop(kd, va, pa)); 210 } 211 212 static int 213 _aarch64_native(kvm_t *kd __unused) 214 { 215 216 #ifdef __aarch64__ 217 return (1); 218 #else 219 return (0); 220 #endif 221 } 222 223 static vm_prot_t 224 _aarch64_entry_to_prot(aarch64_pte_t pte) 225 { 226 vm_prot_t prot = VM_PROT_READ; 227 228 /* Source: arm64/arm64/pmap.c:pmap_protect() */ 229 if ((pte & AARCH64_ATTR_AP(AARCH64_ATTR_AP_RO)) == 0) 230 prot |= VM_PROT_WRITE; 231 if ((pte & AARCH64_ATTR_XN) == 0) 232 prot |= VM_PROT_EXECUTE; 233 return prot; 234 } 235 236 static int 237 _aarch64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg) 238 { 239 struct vmstate *vm = kd->vmst; 240 u_long nptes = vm->hdr.pmapsize / sizeof(aarch64_pte_t); 241 u_long bmindex, dva, pa, pteindex, va; 242 struct kvm_bitmap bm; 243 vm_prot_t prot; 244 int ret = 0; 245 246 if (!_kvm_bitmap_init(&bm, vm->hdr.bitmapsize, &bmindex)) 247 return (0); 248 249 for (pteindex = 0; pteindex < nptes; pteindex++) { 250 aarch64_pte_t pte = _aarch64_pte_get(kd, pteindex); 251 252 if ((pte & AARCH64_ATTR_DESCR_MASK) != AARCH64_L3_PAGE) 253 continue; 254 255 va = vm->hdr.kernbase + (pteindex << AARCH64_L3_SHIFT); 256 pa = pte & ~AARCH64_ATTR_MASK; 257 dva = vm->hdr.dmapbase + pa; 258 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva, 259 _aarch64_entry_to_prot(pte), AARCH64_PAGE_SIZE, 0)) { 260 goto out; 261 } 262 } 263 264 while (_kvm_bitmap_next(&bm, &bmindex)) { 265 pa = _kvm_bit_id_pa(kd, bmindex, AARCH64_PAGE_SIZE); 266 if (pa == _KVM_PA_INVALID) 267 break; 268 dva = vm->hdr.dmapbase + pa; 269 if (vm->hdr.dmapend < (dva + AARCH64_PAGE_SIZE)) 270 break; 271 va = 0; 272 prot = VM_PROT_READ | VM_PROT_WRITE; 273 if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva, 274 prot, AARCH64_PAGE_SIZE, 0)) { 275 goto out; 276 } 277 } 278 ret = 1; 279 280 out: 281 _kvm_bitmap_deinit(&bm); 282 return (ret); 283 } 284 285 static struct kvm_arch kvm_aarch64_minidump = { 286 .ka_probe = _aarch64_minidump_probe, 287 .ka_initvtop = _aarch64_minidump_initvtop, 288 .ka_freevtop = _aarch64_minidump_freevtop, 289 .ka_kvatop = _aarch64_minidump_kvatop, 290 .ka_native = _aarch64_native, 291 .ka_walk_pages = _aarch64_minidump_walk_pages, 292 }; 293 294 KVM_ARCH(kvm_aarch64_minidump); 295