kvm_minidump_arm.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2008 Semihalf, Grzegorz Bernacki 5 * Copyright (c) 2006 Peter Wemm 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * From: FreeBSD: src/lib/libkvm/kvm_minidump_i386.c,v 1.2 2006/06/05 08:51:14 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/11/lib/libkvm/kvm_minidump_arm.c 330897 2018-03-14 03:19:51Z eadler $"); 33 34/* 35 * ARM machine dependent routines for kvm and minidumps. 36 */ 37 38#include <sys/endian.h> 39#include <sys/param.h> 40#include <kvm.h> 41#include <limits.h> 42#include <stdint.h> 43#include <stdlib.h> 44#include <string.h> 45#include <unistd.h> 46 47#include "../../sys/arm/include/minidump.h" 48 49#include "kvm_private.h" 50#include "kvm_arm.h" 51 52#define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE) 53 54struct vmstate { 55 struct minidumphdr hdr; 56 struct hpt hpt; 57 void *ptemap; 58 unsigned char ei_data; 59}; 60 61static int 62_arm_minidump_probe(kvm_t *kd) 63{ 64 65 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && 66 _kvm_is_minidump(kd)); 67} 68 69static void 70_arm_minidump_freevtop(kvm_t *kd) 71{ 72 struct vmstate *vm = kd->vmst; 73 74 _kvm_hpt_free(&vm->hpt); 75 if (vm->ptemap) 76 free(vm->ptemap); 77 free(vm); 78 kd->vmst = NULL; 79} 80 81static int 82_arm_minidump_initvtop(kvm_t *kd) 83{ 84 struct vmstate *vmst; 85 uint32_t *bitmap; 86 off_t off; 87 88 vmst = _kvm_malloc(kd, sizeof(*vmst)); 89 if (vmst == NULL) { 90 _kvm_err(kd, kd->program, "cannot allocate vm"); 91 return (-1); 92 } 93 94 kd->vmst = vmst; 95 96 if (pread(kd->pmfd, &vmst->hdr, 97 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { 98 _kvm_err(kd, kd->program, "cannot read dump header"); 99 return (-1); 100 } 101 102 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, 103 sizeof(vmst->hdr.magic)) != 0) { 104 _kvm_err(kd, kd->program, "not a minidump for this platform"); 105 return (-1); 106 } 107 vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version); 108 if (vmst->hdr.version != MINIDUMP_VERSION) { 109 _kvm_err(kd, kd->program, "wrong minidump version. " 110 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); 111 return (-1); 112 } 113 vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize); 114 vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize); 115 vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize); 116 vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase); 117 vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch); 118 vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat); 119 if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) { 120 /* This is a safe default as 1K pages are not used. */ 121 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6; 122 } 123 124 /* Skip header and msgbuf */ 125 off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize); 126 127 bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); 128 if (bitmap == NULL) { 129 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 130 "bitmap", vmst->hdr.bitmapsize); 131 return (-1); 132 } 133 134 if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) != 135 (ssize_t)vmst->hdr.bitmapsize) { 136 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", 137 vmst->hdr.bitmapsize); 138 free(bitmap); 139 return (-1); 140 } 141 off += arm_round_page(vmst->hdr.bitmapsize); 142 143 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 144 if (vmst->ptemap == NULL) { 145 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 146 "ptemap", vmst->hdr.ptesize); 147 free(bitmap); 148 return (-1); 149 } 150 151 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 152 (ssize_t)vmst->hdr.ptesize) { 153 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", 154 vmst->hdr.ptesize); 155 free(bitmap); 156 return (-1); 157 } 158 159 off += vmst->hdr.ptesize; 160 161 /* Build physical address hash table for sparse pages */ 162 _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off, 163 ARM_PAGE_SIZE, sizeof(*bitmap)); 164 free(bitmap); 165 166 return (0); 167} 168 169static int 170_arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 171{ 172 struct vmstate *vm; 173 arm_pt_entry_t pte; 174 arm_physaddr_t offset, a; 175 kvaddr_t pteindex; 176 off_t ofs; 177 arm_pt_entry_t *ptemap; 178 179 if (ISALIVE(kd)) { 180 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!"); 181 return (0); 182 } 183 184 vm = kd->vmst; 185 ptemap = vm->ptemap; 186 187 if (va >= vm->hdr.kernbase) { 188 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT; 189 pte = _kvm32toh(kd, ptemap[pteindex]); 190 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) { 191 _kvm_err(kd, kd->program, 192 "_arm_minidump_kvatop: pte not valid"); 193 goto invalid; 194 } 195 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { 196 /* 64K page -> convert to be like 4K page */ 197 offset = va & ARM_L2_S_OFFSET; 198 a = (pte & ARM_L2_L_FRAME) + 199 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME); 200 } else { 201 if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 && 202 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) { 203 _kvm_err(kd, kd->program, 204 "_arm_minidump_kvatop: pte not supported"); 205 goto invalid; 206 } 207 /* 4K page */ 208 offset = va & ARM_L2_S_OFFSET; 209 a = pte & ARM_L2_S_FRAME; 210 } 211 212 ofs = _kvm_hpt_find(&vm->hpt, a); 213 if (ofs == -1) { 214 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: " 215 "physical address 0x%jx not in minidump", 216 (uintmax_t)a); 217 goto invalid; 218 } 219 220 *pa = ofs + offset; 221 return (ARM_PAGE_SIZE - offset); 222 } else 223 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual " 224 "address 0x%jx not minidumped", (uintmax_t)va); 225 226invalid: 227 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 228 return (0); 229} 230 231static struct kvm_arch kvm_arm_minidump = { 232 .ka_probe = _arm_minidump_probe, 233 .ka_initvtop = _arm_minidump_initvtop, 234 .ka_freevtop = _arm_minidump_freevtop, 235 .ka_kvatop = _arm_minidump_kvatop, 236 .ka_native = _arm_native, 237}; 238 239KVM_ARCH(kvm_arm_minidump); 240