1 /*- 2 * Copyright (c) 2005 Olivier Houchard 3 * Copyright (c) 1989, 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software developed by the Computer Systems 7 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 8 * BG 91-66 and contributed to Berkeley. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * ARM machine dependent routines for kvm. 36 */ 37 38 #include <sys/cdefs.h> 39 __FBSDID("$FreeBSD$"); 40 41 #include <sys/param.h> 42 #include <sys/elf32.h> 43 #include <sys/mman.h> 44 45 #ifndef CROSS_LIBKVM 46 #include <vm/vm.h> 47 #include <vm/vm_param.h> 48 #include <vm/pmap.h> 49 #include <machine/pmap.h> 50 #else 51 #include "../../sys/arm/include/pte.h" 52 #include "../../sys/arm/include/vmparam.h" 53 #endif 54 55 #include <db.h> 56 #include <limits.h> 57 #include <kvm.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #include "kvm_private.h" 63 64 /* minidump must be the first item! */ 65 struct vmstate { 66 int minidump; /* 1 = minidump mode */ 67 pd_entry_t *l1pt; 68 void *mmapbase; 69 size_t mmapsize; 70 }; 71 72 static int 73 _kvm_maphdrs(kvm_t *kd, size_t sz) 74 { 75 struct vmstate *vm = kd->vmst; 76 77 /* munmap() previous mmap(). */ 78 if (vm->mmapbase != NULL) { 79 munmap(vm->mmapbase, vm->mmapsize); 80 vm->mmapbase = NULL; 81 } 82 83 vm->mmapsize = sz; 84 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 85 if (vm->mmapbase == MAP_FAILED) { 86 _kvm_err(kd, kd->program, "cannot mmap corefile"); 87 return (-1); 88 } 89 90 return (0); 91 } 92 93 /* 94 * Translate a physical memory address to a file-offset in the crash-dump. 95 */ 96 static size_t 97 _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 98 { 99 Elf32_Ehdr *e = kd->vmst->mmapbase; 100 Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff); 101 int n = e->e_phnum; 102 103 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 104 p++, n--; 105 if (n == 0) 106 return (0); 107 108 *ofs = (pa - p->p_paddr) + p->p_offset; 109 if (pgsz == 0) 110 return (p->p_memsz - (pa - p->p_paddr)); 111 return (pgsz - ((size_t)pa & (pgsz - 1))); 112 } 113 114 void 115 _kvm_freevtop(kvm_t *kd) 116 { 117 if (kd->vmst != 0) { 118 if (kd->vmst->minidump) 119 return (_kvm_minidump_freevtop(kd)); 120 if (kd->vmst->mmapbase != NULL) 121 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize); 122 free(kd->vmst); 123 kd->vmst = NULL; 124 } 125 } 126 127 int 128 _kvm_initvtop(kvm_t *kd) 129 { 130 struct vmstate *vm; 131 struct nlist nl[2]; 132 u_long kernbase, physaddr, pa; 133 pd_entry_t *l1pt; 134 Elf32_Ehdr *ehdr; 135 Elf32_Phdr *phdr; 136 size_t hdrsz; 137 char minihdr[8]; 138 int found, i; 139 140 if (!kd->rawdump) { 141 if (pread(kd->pmfd, &minihdr, 8, 0) == 8) { 142 if (memcmp(&minihdr, "minidump", 8) == 0) 143 return (_kvm_minidump_initvtop(kd)); 144 } else { 145 _kvm_err(kd, kd->program, "cannot read header"); 146 return (-1); 147 } 148 } 149 150 vm = _kvm_malloc(kd, sizeof(*vm)); 151 if (vm == 0) { 152 _kvm_err(kd, kd->program, "cannot allocate vm"); 153 return (-1); 154 } 155 kd->vmst = vm; 156 vm->l1pt = NULL; 157 if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1) 158 return (-1); 159 ehdr = kd->vmst->mmapbase; 160 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 161 if (_kvm_maphdrs(kd, hdrsz) == -1) 162 return (-1); 163 164 phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff); 165 found = 0; 166 for (i = 0; i < ehdr->e_phnum; i++) { 167 if (phdr[i].p_type == PT_DUMP_DELTA) { 168 kernbase = phdr[i].p_vaddr; 169 physaddr = phdr[i].p_paddr; 170 found = 1; 171 break; 172 } 173 } 174 175 nl[1].n_name = NULL; 176 if (!found) { 177 nl[0].n_name = "kernbase"; 178 if (kvm_nlist(kd, nl) != 0) 179 kernbase = KERNBASE; 180 else 181 kernbase = nl[0].n_value; 182 183 nl[0].n_name = "physaddr"; 184 if (kvm_nlist(kd, nl) != 0) { 185 _kvm_err(kd, kd->program, "couldn't get phys addr"); 186 return (-1); 187 } 188 physaddr = nl[0].n_value; 189 } 190 nl[0].n_name = "kernel_l1pa"; 191 if (kvm_nlist(kd, nl) != 0) { 192 _kvm_err(kd, kd->program, "bad namelist"); 193 return (-1); 194 } 195 if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa, 196 sizeof(pa)) != sizeof(pa)) { 197 _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 198 return (-1); 199 } 200 l1pt = _kvm_malloc(kd, L1_TABLE_SIZE); 201 if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) { 202 _kvm_err(kd, kd->program, "cannot read l1pt"); 203 free(l1pt); 204 return (-1); 205 } 206 vm->l1pt = l1pt; 207 return 0; 208 } 209 210 /* from arm/pmap.c */ 211 #define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT) 212 /* from arm/pmap.h */ 213 #define L1_TYPE_INV 0x00 /* Invalid (fault) */ 214 #define L1_TYPE_C 0x01 /* Coarse L2 */ 215 #define L1_TYPE_S 0x02 /* Section */ 216 #define L1_TYPE_F 0x03 /* Fine L2 */ 217 #define L1_TYPE_MASK 0x03 /* mask of type bits */ 218 219 #define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S) 220 #define l1pte_valid(pde) ((pde) != 0) 221 #define l2pte_valid(pte) ((pte) != 0) 222 #define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT) 223 224 225 int 226 _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 227 { 228 struct vmstate *vm = kd->vmst; 229 pd_entry_t pd; 230 pt_entry_t pte; 231 off_t pte_pa; 232 233 if (kd->vmst->minidump) 234 return (_kvm_minidump_kvatop(kd, va, pa)); 235 236 if (vm->l1pt == NULL) 237 return (_kvm_pa2off(kd, va, pa, PAGE_SIZE)); 238 pd = vm->l1pt[L1_IDX(va)]; 239 if (!l1pte_valid(pd)) 240 goto invalid; 241 if (l1pte_section_p(pd)) { 242 /* 1MB section mapping. */ 243 *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET); 244 return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE)); 245 } 246 pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 247 _kvm_pa2off(kd, pte_pa, &pte_pa, L1_S_SIZE); 248 if (lseek(kd->pmfd, pte_pa, 0) == -1) { 249 _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek"); 250 goto invalid; 251 } 252 if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) { 253 _kvm_syserr(kd, kd->program, "_kvm_kvatop: read"); 254 goto invalid; 255 } 256 if (!l2pte_valid(pte)) { 257 goto invalid; 258 } 259 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { 260 *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); 261 return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE)); 262 } 263 *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); 264 return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE)); 265 invalid: 266 _kvm_err(kd, 0, "Invalid address (%lx)", va); 267 return 0; 268 } 269 270 /* 271 * Machine-dependent initialization for ALL open kvm descriptors, 272 * not just those for a kernel crash dump. Some architectures 273 * have to deal with these NOT being constants! (i.e. m68k) 274 */ 275 #ifdef FBSD_NOT_YET 276 int 277 _kvm_mdopen(kvm_t *kd) 278 { 279 280 kd->usrstack = USRSTACK; 281 kd->min_uva = VM_MIN_ADDRESS; 282 kd->max_uva = VM_MAXUSER_ADDRESS; 283 284 return (0); 285 } 286 #endif 287