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/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 52 struct vmstate { 53 struct minidumphdr hdr; 54 void *ptemap; 55 unsigned char ei_data; 56 }; 57 58 static int 59 _arm_minidump_probe(kvm_t *kd) 60 { 61 62 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && 63 _kvm_is_minidump(kd)); 64 } 65 66 static void 67 _arm_minidump_freevtop(kvm_t *kd) 68 { 69 struct vmstate *vm = kd->vmst; 70 71 free(vm->ptemap); 72 free(vm); 73 kd->vmst = NULL; 74 } 75 76 static int 77 _arm_minidump_initvtop(kvm_t *kd) 78 { 79 struct vmstate *vmst; 80 off_t off, sparse_off; 81 82 vmst = _kvm_malloc(kd, sizeof(*vmst)); 83 if (vmst == NULL) { 84 _kvm_err(kd, kd->program, "cannot allocate vm"); 85 return (-1); 86 } 87 88 kd->vmst = vmst; 89 90 if (pread(kd->pmfd, &vmst->hdr, 91 sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) { 92 _kvm_err(kd, kd->program, "cannot read dump header"); 93 return (-1); 94 } 95 96 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, 97 sizeof(vmst->hdr.magic)) != 0) { 98 _kvm_err(kd, kd->program, "not a minidump for this platform"); 99 return (-1); 100 } 101 vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version); 102 if (vmst->hdr.version != MINIDUMP_VERSION) { 103 _kvm_err(kd, kd->program, "wrong minidump version. " 104 "Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version); 105 return (-1); 106 } 107 vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize); 108 vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize); 109 vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize); 110 vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase); 111 vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch); 112 vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat); 113 if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) { 114 /* This is a safe default as 1K pages are not used. */ 115 vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6; 116 } 117 118 /* Skip header and msgbuf */ 119 off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize); 120 121 sparse_off = off + arm_round_page(vmst->hdr.bitmapsize) + 122 arm_round_page(vmst->hdr.ptesize); 123 if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off, 124 ARM_PAGE_SIZE, sizeof(uint32_t)) == -1) { 125 _kvm_err(kd, kd->program, "cannot load core bitmap"); 126 return (-1); 127 } 128 off += arm_round_page(vmst->hdr.bitmapsize); 129 130 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize); 131 if (vmst->ptemap == NULL) { 132 _kvm_err(kd, kd->program, "cannot allocate %d bytes for " 133 "ptemap", vmst->hdr.ptesize); 134 return (-1); 135 } 136 137 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) != 138 (ssize_t)vmst->hdr.ptesize) { 139 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", 140 vmst->hdr.ptesize); 141 return (-1); 142 } 143 off += arm_round_page(vmst->hdr.ptesize); 144 145 return (0); 146 } 147 148 static int 149 _arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 150 { 151 struct vmstate *vm; 152 arm_pt_entry_t pte; 153 arm_physaddr_t offset, a; 154 kvaddr_t pteindex; 155 off_t ofs; 156 arm_pt_entry_t *ptemap; 157 158 if (ISALIVE(kd)) { 159 _kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!"); 160 return (0); 161 } 162 163 vm = kd->vmst; 164 ptemap = vm->ptemap; 165 166 if (va >= vm->hdr.kernbase) { 167 pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT; 168 if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap)) 169 goto invalid; 170 pte = _kvm32toh(kd, ptemap[pteindex]); 171 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) { 172 _kvm_err(kd, kd->program, 173 "_arm_minidump_kvatop: pte not valid"); 174 goto invalid; 175 } 176 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { 177 /* 64K page -> convert to be like 4K page */ 178 offset = va & ARM_L2_S_OFFSET; 179 a = (pte & ARM_L2_L_FRAME) + 180 (va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME); 181 } else { 182 if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 && 183 (pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) { 184 _kvm_err(kd, kd->program, 185 "_arm_minidump_kvatop: pte not supported"); 186 goto invalid; 187 } 188 /* 4K page */ 189 offset = va & ARM_L2_S_OFFSET; 190 a = pte & ARM_L2_S_FRAME; 191 } 192 193 ofs = _kvm_pt_find(kd, a); 194 if (ofs == -1) { 195 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: " 196 "physical address 0x%jx not in minidump", 197 (uintmax_t)a); 198 goto invalid; 199 } 200 201 *pa = ofs + offset; 202 return (ARM_PAGE_SIZE - offset); 203 } else 204 _kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual " 205 "address 0x%jx not minidumped", (uintmax_t)va); 206 207 invalid: 208 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va); 209 return (0); 210 } 211 212 static struct kvm_arch kvm_arm_minidump = { 213 .ka_probe = _arm_minidump_probe, 214 .ka_initvtop = _arm_minidump_initvtop, 215 .ka_freevtop = _arm_minidump_freevtop, 216 .ka_kvatop = _arm_minidump_kvatop, 217 .ka_native = _arm_native, 218 }; 219 220 KVM_ARCH(kvm_arm_minidump); 221