1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 2005 Olivier Houchard 5 * Copyright (c) 1989, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software developed by the Computer Systems 9 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 10 * BG 91-66 and contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * ARM machine dependent routines for kvm. 38 */ 39 40 #include <sys/cdefs.h> 41 #include <sys/param.h> 42 #include <sys/endian.h> 43 #include <kvm.h> 44 #include <limits.h> 45 #include <stdint.h> 46 #include <stdlib.h> 47 #include <unistd.h> 48 49 #ifdef __arm__ 50 #include <machine/vmparam.h> 51 #endif 52 53 #include "kvm_private.h" 54 #include "kvm_arm.h" 55 56 struct vmstate { 57 arm_pd_entry_t *l1pt; 58 size_t phnum; 59 GElf_Phdr *phdr; 60 }; 61 62 /* 63 * Translate a physical memory address to a file-offset in the crash-dump. 64 */ 65 static size_t 66 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 67 { 68 struct vmstate *vm = kd->vmst; 69 GElf_Phdr *p; 70 size_t n; 71 72 p = vm->phdr; 73 n = vm->phnum; 74 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 75 p++, n--; 76 if (n == 0) 77 return (0); 78 79 *ofs = (pa - p->p_paddr) + p->p_offset; 80 if (pgsz == 0) 81 return (p->p_memsz - (pa - p->p_paddr)); 82 return (pgsz - ((size_t)pa & (pgsz - 1))); 83 } 84 85 static void 86 _arm_freevtop(kvm_t *kd) 87 { 88 struct vmstate *vm = kd->vmst; 89 90 free(vm->phdr); 91 free(vm); 92 kd->vmst = NULL; 93 } 94 95 static int 96 _arm_probe(kvm_t *kd) 97 { 98 99 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && 100 !_kvm_is_minidump(kd)); 101 } 102 103 static int 104 _arm_initvtop(kvm_t *kd) 105 { 106 struct vmstate *vm; 107 struct kvm_nlist nl[2]; 108 kvaddr_t kernbase; 109 arm_physaddr_t physaddr, pa; 110 arm_pd_entry_t *l1pt; 111 size_t i; 112 int found; 113 114 if (kd->rawdump) { 115 _kvm_err(kd, kd->program, "raw dumps not supported on arm"); 116 return (-1); 117 } 118 119 vm = _kvm_malloc(kd, sizeof(*vm)); 120 if (vm == NULL) { 121 _kvm_err(kd, kd->program, "cannot allocate vm"); 122 return (-1); 123 } 124 kd->vmst = vm; 125 vm->l1pt = NULL; 126 127 if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1) 128 return (-1); 129 130 found = 0; 131 for (i = 0; i < vm->phnum; i++) { 132 if (vm->phdr[i].p_type == PT_DUMP_DELTA) { 133 kernbase = vm->phdr[i].p_vaddr; 134 physaddr = vm->phdr[i].p_paddr; 135 found = 1; 136 break; 137 } 138 } 139 140 nl[1].n_name = NULL; 141 if (!found) { 142 nl[0].n_name = "kernbase"; 143 if (kvm_nlist2(kd, nl) != 0) { 144 #ifdef __arm__ 145 kernbase = KERNBASE; 146 #else 147 _kvm_err(kd, kd->program, "cannot resolve kernbase"); 148 return (-1); 149 #endif 150 } else 151 kernbase = nl[0].n_value; 152 153 nl[0].n_name = "physaddr"; 154 if (kvm_nlist2(kd, nl) != 0) { 155 _kvm_err(kd, kd->program, "couldn't get phys addr"); 156 return (-1); 157 } 158 physaddr = nl[0].n_value; 159 } 160 nl[0].n_name = "kernel_l1pa"; 161 if (kvm_nlist2(kd, nl) != 0) { 162 _kvm_err(kd, kd->program, "bad namelist"); 163 return (-1); 164 } 165 if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa, 166 sizeof(pa)) != sizeof(pa)) { 167 _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 168 return (-1); 169 } 170 l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE); 171 if (l1pt == NULL) { 172 _kvm_err(kd, kd->program, "cannot allocate l1pt"); 173 return (-1); 174 } 175 if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) { 176 _kvm_err(kd, kd->program, "cannot read l1pt"); 177 free(l1pt); 178 return (-1); 179 } 180 vm->l1pt = l1pt; 181 return 0; 182 } 183 184 /* from arm/pmap.c */ 185 #define ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT) 186 187 #define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S) 188 #define l1pte_valid(pde) ((pde) != 0) 189 #define l2pte_valid(pte) ((pte) != 0) 190 #define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT) 191 192 193 static int 194 _arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 195 { 196 struct vmstate *vm = kd->vmst; 197 arm_pd_entry_t pd; 198 arm_pt_entry_t pte; 199 arm_physaddr_t pte_pa; 200 off_t pte_off; 201 202 if (vm->l1pt == NULL) 203 return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE)); 204 pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]); 205 if (!l1pte_valid(pd)) 206 goto invalid; 207 if (l1pte_section_p(pd)) { 208 /* 1MB section mapping. */ 209 *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET); 210 return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE)); 211 } 212 pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 213 _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE); 214 if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) { 215 _kvm_syserr(kd, kd->program, "_arm_kvatop: pread"); 216 goto invalid; 217 } 218 pte = _kvm32toh(kd, pte); 219 if (!l2pte_valid(pte)) { 220 goto invalid; 221 } 222 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { 223 *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET); 224 return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE)); 225 } 226 *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET); 227 return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE)); 228 invalid: 229 _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va); 230 return 0; 231 } 232 233 /* 234 * Machine-dependent initialization for ALL open kvm descriptors, 235 * not just those for a kernel crash dump. Some architectures 236 * have to deal with these NOT being constants! (i.e. m68k) 237 */ 238 #ifdef FBSD_NOT_YET 239 int 240 _kvm_mdopen(kvm_t *kd) 241 { 242 243 kd->usrstack = USRSTACK; 244 kd->min_uva = VM_MIN_ADDRESS; 245 kd->max_uva = VM_MAXUSER_ADDRESS; 246 247 return (0); 248 } 249 #endif 250 251 int 252 #ifdef __arm__ 253 _arm_native(kvm_t *kd) 254 #else 255 _arm_native(kvm_t *kd __unused) 256 #endif 257 { 258 259 #ifdef __arm__ 260 #if _BYTE_ORDER == _LITTLE_ENDIAN 261 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB); 262 #else 263 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB); 264 #endif 265 #else 266 return (0); 267 #endif 268 } 269 270 static struct kvm_arch kvm_arm = { 271 .ka_probe = _arm_probe, 272 .ka_initvtop = _arm_initvtop, 273 .ka_freevtop = _arm_freevtop, 274 .ka_kvatop = _arm_kvatop, 275 .ka_native = _arm_native, 276 }; 277 278 KVM_ARCH(kvm_arm); 279