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: releng/11.0/lib/libkvm/kvm_minidump_arm.c 298485 2016-04-22 18:05:34Z ngie $"); 31 32/* 33 * ARM machine dependent routines for kvm and minidumps. 34 */ 35 36#include <sys/endian.h> 37#include <sys/param.h> 38#include <kvm.h> 39#include <limits.h> 40#include <stdint.h> 41#include <stdlib.h> 42#include <string.h> 43#include <unistd.h> 44 45#include "../../sys/arm/include/minidump.h" 46 47#include "kvm_private.h" 48#include "kvm_arm.h" 49 50#define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE) 51 52struct vmstate { 53 struct minidumphdr hdr; 54 struct hpt hpt; 55 void *ptemap; 56 unsigned char ei_data; 57}; 58 59static int 60_arm_minidump_probe(kvm_t *kd) 61{ 62 63 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && 64 _kvm_is_minidump(kd)); 65} 66 67static void 68_arm_minidump_freevtop(kvm_t *kd) 69{ 70 struct vmstate *vm = kd->vmst; 71 72 _kvm_hpt_free(&vm->hpt); 73 if (vm->ptemap) 74 free(vm->ptemap); 75 free(vm); 76 kd->vmst = NULL; 77} 78 79static int 80_arm_minidump_initvtop(kvm_t *kd) 81{ 82 struct vmstate *vmst; 83 uint32_t *bitmap; 84 off_t off; 85 86 vmst = _kvm_malloc(kd, sizeof(*vmst)); 87 if (vmst == NULL) { 88 _kvm_err(kd, kd->program, "cannot allocate vm"); 89 return (-1); 90 } 91 92 kd->vmst = vmst; 93 94 if (pread(kd->pmfd, &vmst->hdr, 95 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { 96 _kvm_err(kd, kd->program, "cannot read dump header"); 97 return (-1); 98 } 99 100 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, 101 sizeof(vmst->hdr.magic)) != 0) { 102 _kvm_err(kd, kd->program, "not a minidump for this platform"); 103 return (-1); 104 } 105 vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version); 106 if (vmst->hdr.version != MINIDUMP_VERSION) { 107 _kvm_err(kd, kd->program, "wrong minidump version. " 108 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); 109 return (-1); 110 } 111 vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize); 112 vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize); 113 vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize); 114 vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase); 115 vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch); 116 vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat); 117 if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) { 118 /* This is a safe default as 1K pages are not used. */ 119 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6; 120 } 121 122 /* Skip header and msgbuf */ 123 off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize); 124 125 bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize); 126 if (bitmap == NULL) { 127 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 128 "bitmap", vmst->hdr.bitmapsize); 129 return (-1); 130 } 131 132 if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) != 133 (ssize_t)vmst->hdr.bitmapsize) { 134 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", 135 vmst->hdr.bitmapsize); 136 free(bitmap); 137 return (-1); 138 } 139 off += arm_round_page(vmst->hdr.bitmapsize); 140 141 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 142 if (vmst->ptemap == NULL) { 143 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 144 "ptemap", vmst->hdr.ptesize); 145 free(bitmap); 146 return (-1); 147 } 148 149 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 150 (ssize_t)vmst->hdr.ptesize) { 151 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", 152 vmst->hdr.ptesize); 153 free(bitmap); 154 return (-1); 155 } 156 157 off += vmst->hdr.ptesize; 158 159 /* Build physical address hash table for sparse pages */ 160 _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off, 161 ARM_PAGE_SIZE, sizeof(*bitmap)); 162 free(bitmap); 163 164 return (0); 165} 166 167static int 168_arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 169{ 170 struct vmstate *vm; 171 arm_pt_entry_t pte; 172 arm_physaddr_t offset, a; 173 kvaddr_t pteindex; 174 off_t ofs; 175 arm_pt_entry_t *ptemap; 176 177 if (ISALIVE(kd)) { 178 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!"); 179 return (0); 180 } 181 182 vm = kd->vmst; 183 ptemap = vm->ptemap; 184 185 if (va >= vm->hdr.kernbase) { 186 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT; 187 pte = _kvm32toh(kd, ptemap[pteindex]); 188 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) { 189 _kvm_err(kd, kd->program, 190 "_arm_minidump_kvatop: pte not valid"); 191 goto invalid; 192 } 193 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { 194 /* 64K page -> convert to be like 4K page */ 195 offset = va & ARM_L2_S_OFFSET; 196 a = (pte & ARM_L2_L_FRAME) + 197 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME); 198 } else { 199 if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 && 200 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) { 201 _kvm_err(kd, kd->program, 202 "_arm_minidump_kvatop: pte not supported"); 203 goto invalid; 204 } 205 /* 4K page */ 206 offset = va & ARM_L2_S_OFFSET; 207 a = pte & ARM_L2_S_FRAME; 208 } 209 210 ofs = _kvm_hpt_find(&vm->hpt, a); 211 if (ofs == -1) { 212 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: " 213 "physical address 0x%jx not in minidump", 214 (uintmax_t)a); 215 goto invalid; 216 } 217 218 *pa = ofs + offset; 219 return (ARM_PAGE_SIZE - offset); 220 } else 221 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual " 222 "address 0x%jx not minidumped", (uintmax_t)va); 223 224invalid: 225 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 226 return (0); 227} 228 229struct kvm_arch kvm_arm_minidump = { 230 .ka_probe = _arm_minidump_probe, 231 .ka_initvtop = _arm_minidump_initvtop, 232 .ka_freevtop = _arm_minidump_freevtop, 233 .ka_kvatop = _arm_minidump_kvatop, 234 .ka_native = _arm_native, 235}; 236 237KVM_ARCH(kvm_arm_minidump); 238