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 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/endian.h> 45 #include <kvm.h> 46 #include <limits.h> 47 #include <stdint.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 51 #ifdef __arm__ 52 #include <machine/vmparam.h> 53 #endif 54 55 #include "kvm_private.h" 56 #include "kvm_arm.h" 57 58 struct vmstate { 59 arm_pd_entry_t *l1pt; 60 size_t phnum; 61 GElf_Phdr *phdr; 62 }; 63 64 /* 65 * Translate a physical memory address to a file-offset in the crash-dump. 66 */ 67 static size_t 68 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 69 { 70 struct vmstate *vm = kd->vmst; 71 GElf_Phdr *p; 72 size_t n; 73 74 p = vm->phdr; 75 n = vm->phnum; 76 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 77 p++, n--; 78 if (n == 0) 79 return (0); 80 81 *ofs = (pa - p->p_paddr) + p->p_offset; 82 if (pgsz == 0) 83 return (p->p_memsz - (pa - p->p_paddr)); 84 return (pgsz - ((size_t)pa & (pgsz - 1))); 85 } 86 87 static void 88 _arm_freevtop(kvm_t *kd) 89 { 90 struct vmstate *vm = kd->vmst; 91 92 free(vm->phdr); 93 free(vm); 94 kd->vmst = NULL; 95 } 96 97 static int 98 _arm_probe(kvm_t *kd) 99 { 100 101 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && 102 !_kvm_is_minidump(kd)); 103 } 104 105 static int 106 _arm_initvtop(kvm_t *kd) 107 { 108 struct vmstate *vm; 109 struct kvm_nlist nl[2]; 110 kvaddr_t kernbase; 111 arm_physaddr_t physaddr, pa; 112 arm_pd_entry_t *l1pt; 113 size_t i; 114 int found; 115 116 if (kd->rawdump) { 117 _kvm_err(kd, kd->program, "raw dumps not supported on arm"); 118 return (-1); 119 } 120 121 vm = _kvm_malloc(kd, sizeof(*vm)); 122 if (vm == NULL) { 123 _kvm_err(kd, kd->program, "cannot allocate vm"); 124 return (-1); 125 } 126 kd->vmst = vm; 127 vm->l1pt = NULL; 128 129 if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1) 130 return (-1); 131 132 found = 0; 133 for (i = 0; i < vm->phnum; i++) { 134 if (vm->phdr[i].p_type == PT_DUMP_DELTA) { 135 kernbase = vm->phdr[i].p_vaddr; 136 physaddr = vm->phdr[i].p_paddr; 137 found = 1; 138 break; 139 } 140 } 141 142 nl[1].n_name = NULL; 143 if (!found) { 144 nl[0].n_name = "kernbase"; 145 if (kvm_nlist2(kd, nl) != 0) { 146 #ifdef __arm__ 147 kernbase = KERNBASE; 148 #else 149 _kvm_err(kd, kd->program, "cannot resolve kernbase"); 150 return (-1); 151 #endif 152 } else 153 kernbase = nl[0].n_value; 154 155 nl[0].n_name = "physaddr"; 156 if (kvm_nlist2(kd, nl) != 0) { 157 _kvm_err(kd, kd->program, "couldn't get phys addr"); 158 return (-1); 159 } 160 physaddr = nl[0].n_value; 161 } 162 nl[0].n_name = "kernel_l1pa"; 163 if (kvm_nlist2(kd, nl) != 0) { 164 _kvm_err(kd, kd->program, "bad namelist"); 165 return (-1); 166 } 167 if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa, 168 sizeof(pa)) != sizeof(pa)) { 169 _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 170 return (-1); 171 } 172 l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE); 173 if (l1pt == NULL) { 174 _kvm_err(kd, kd->program, "cannot allocate l1pt"); 175 return (-1); 176 } 177 if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) { 178 _kvm_err(kd, kd->program, "cannot read l1pt"); 179 free(l1pt); 180 return (-1); 181 } 182 vm->l1pt = l1pt; 183 return 0; 184 } 185 186 /* from arm/pmap.c */ 187 #define ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT) 188 189 #define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S) 190 #define l1pte_valid(pde) ((pde) != 0) 191 #define l2pte_valid(pte) ((pte) != 0) 192 #define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT) 193 194 195 static int 196 _arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 197 { 198 struct vmstate *vm = kd->vmst; 199 arm_pd_entry_t pd; 200 arm_pt_entry_t pte; 201 arm_physaddr_t pte_pa; 202 off_t pte_off; 203 204 if (vm->l1pt == NULL) 205 return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE)); 206 pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]); 207 if (!l1pte_valid(pd)) 208 goto invalid; 209 if (l1pte_section_p(pd)) { 210 /* 1MB section mapping. */ 211 *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET); 212 return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE)); 213 } 214 pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 215 _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE); 216 if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) { 217 _kvm_syserr(kd, kd->program, "_arm_kvatop: pread"); 218 goto invalid; 219 } 220 pte = _kvm32toh(kd, pte); 221 if (!l2pte_valid(pte)) { 222 goto invalid; 223 } 224 if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { 225 *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET); 226 return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE)); 227 } 228 *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET); 229 return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE)); 230 invalid: 231 _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va); 232 return 0; 233 } 234 235 /* 236 * Machine-dependent initialization for ALL open kvm descriptors, 237 * not just those for a kernel crash dump. Some architectures 238 * have to deal with these NOT being constants! (i.e. m68k) 239 */ 240 #ifdef FBSD_NOT_YET 241 int 242 _kvm_mdopen(kvm_t *kd) 243 { 244 245 kd->usrstack = USRSTACK; 246 kd->min_uva = VM_MIN_ADDRESS; 247 kd->max_uva = VM_MAXUSER_ADDRESS; 248 249 return (0); 250 } 251 #endif 252 253 int 254 #ifdef __arm__ 255 _arm_native(kvm_t *kd) 256 #else 257 _arm_native(kvm_t *kd __unused) 258 #endif 259 { 260 261 #ifdef __arm__ 262 #if _BYTE_ORDER == _LITTLE_ENDIAN 263 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB); 264 #else 265 return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB); 266 #endif 267 #else 268 return (0); 269 #endif 270 } 271 272 static struct kvm_arch kvm_arm = { 273 .ka_probe = _arm_probe, 274 .ka_initvtop = _arm_initvtop, 275 .ka_freevtop = _arm_freevtop, 276 .ka_kvatop = _arm_kvatop, 277 .ka_native = _arm_native, 278 }; 279 280 KVM_ARCH(kvm_arm); 281