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: releng/10.3/lib/libkvm/kvm_arm.c 273828 2014-10-29 16:36:08Z andrew $"); 40 41#include <sys/param.h> 42#include <sys/elf32.h> 43#include <sys/mman.h> 44 45#include <vm/vm.h> 46#include <vm/vm_param.h> 47#include <vm/pmap.h> 48 49#include <machine/pmap.h> 50 51#include <db.h> 52#include <limits.h> 53#include <kvm.h> 54#include <stdlib.h> 55#include <string.h> 56#include <unistd.h> 57 58#include "kvm_private.h" 59 60/* minidump must be the first item! */ 61struct vmstate { 62 int minidump; /* 1 = minidump mode */ 63 pd_entry_t *l1pt; 64 void *mmapbase; 65 size_t mmapsize; 66}; 67 68static int 69_kvm_maphdrs(kvm_t *kd, size_t sz) 70{ 71 struct vmstate *vm = kd->vmst; 72 73 /* munmap() previous mmap(). */ 74 if (vm->mmapbase != NULL) { 75 munmap(vm->mmapbase, vm->mmapsize); 76 vm->mmapbase = NULL; 77 } 78 79 vm->mmapsize = sz; 80 vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 81 if (vm->mmapbase == MAP_FAILED) { 82 _kvm_err(kd, kd->program, "cannot mmap corefile"); 83 return (-1); 84 } 85 86 return (0); 87} 88 89/* 90 * Translate a physical memory address to a file-offset in the crash-dump. 91 */ 92static size_t 93_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 94{ 95 Elf32_Ehdr *e = kd->vmst->mmapbase; 96 Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff); 97 int n = e->e_phnum; 98 99 while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 100 p++, n--; 101 if (n == 0) 102 return (0); 103 104 *ofs = (pa - p->p_paddr) + p->p_offset; 105 if (pgsz == 0) 106 return (p->p_memsz - (pa - p->p_paddr)); 107 return (pgsz - ((size_t)pa & (pgsz - 1))); 108} 109 110void 111_kvm_freevtop(kvm_t *kd) 112{ 113 if (kd->vmst != 0) { 114 if (kd->vmst->minidump) 115 return (_kvm_minidump_freevtop(kd)); 116 if (kd->vmst->mmapbase != NULL) 117 munmap(kd->vmst->mmapbase, kd->vmst->mmapsize); 118 free(kd->vmst); 119 kd->vmst = NULL; 120 } 121} 122 123int 124_kvm_initvtop(kvm_t *kd) 125{ 126 struct vmstate *vm; 127 struct nlist nl[2]; 128 u_long kernbase, physaddr, pa; 129 pd_entry_t *l1pt; 130 Elf32_Ehdr *ehdr; 131 Elf32_Phdr *phdr; 132 size_t hdrsz; 133 char minihdr[8]; 134 int found, i; 135 136 if (!kd->rawdump) { 137 if (pread(kd->pmfd, &minihdr, 8, 0) == 8) { 138 if (memcmp(&minihdr, "minidump", 8) == 0) 139 return (_kvm_minidump_initvtop(kd)); 140 } else { 141 _kvm_err(kd, kd->program, "cannot read header"); 142 return (-1); 143 } 144 } 145 146 vm = _kvm_malloc(kd, sizeof(*vm)); 147 if (vm == 0) { 148 _kvm_err(kd, kd->program, "cannot allocate vm"); 149 return (-1); 150 } 151 kd->vmst = vm; 152 vm->l1pt = NULL; 153 if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1) 154 return (-1); 155 ehdr = kd->vmst->mmapbase; 156 hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 157 if (_kvm_maphdrs(kd, hdrsz) == -1) 158 return (-1); 159 160 phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff); 161 found = 0; 162 for (i = 0; i < ehdr->e_phnum; i++) { 163 if (phdr[i].p_type == PT_DUMP_DELTA) { 164 kernbase = phdr[i].p_vaddr; 165 physaddr = phdr[i].p_paddr; 166 found = 1; 167 break; 168 } 169 } 170 171 nl[1].n_name = NULL; 172 if (!found) { 173 nl[0].n_name = "kernbase"; 174 if (kvm_nlist(kd, nl) != 0) 175 kernbase = KERNBASE; 176 else 177 kernbase = nl[0].n_value; 178 179 nl[0].n_name = "physaddr"; 180 if (kvm_nlist(kd, nl) != 0) { 181 _kvm_err(kd, kd->program, "couldn't get phys addr"); 182 return (-1); 183 } 184 physaddr = nl[0].n_value; 185 } 186 nl[0].n_name = "kernel_l1pa"; 187 if (kvm_nlist(kd, nl) != 0) { 188 _kvm_err(kd, kd->program, "bad namelist"); 189 return (-1); 190 } 191 if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa, 192 sizeof(pa)) != sizeof(pa)) { 193 _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 194 return (-1); 195 } 196 l1pt = _kvm_malloc(kd, L1_TABLE_SIZE); 197 if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) { 198 _kvm_err(kd, kd->program, "cannot read l1pt"); 199 free(l1pt); 200 return (-1); 201 } 202 vm->l1pt = l1pt; 203 return 0; 204} 205 206/* from arm/pmap.c */ 207#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT) 208/* from arm/pmap.h */ 209#define L1_TYPE_INV 0x00 /* Invalid (fault) */ 210#define L1_TYPE_C 0x01 /* Coarse L2 */ 211#define L1_TYPE_S 0x02 /* Section */ 212#define L1_TYPE_F 0x03 /* Fine L2 */ 213#define L1_TYPE_MASK 0x03 /* mask of type bits */ 214 215#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S) 216#define l1pte_valid(pde) ((pde) != 0) 217#define l2pte_valid(pte) ((pte) != 0) 218#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT) 219 220 221int 222_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 223{ 224 struct vmstate *vm = kd->vmst; 225 pd_entry_t pd; 226 pt_entry_t pte; 227 u_long pte_pa; 228 229 if (kd->vmst->minidump) 230 return (_kvm_minidump_kvatop(kd, va, pa)); 231 232 if (vm->l1pt == NULL) 233 return (_kvm_pa2off(kd, va, pa, PAGE_SIZE)); 234 pd = vm->l1pt[L1_IDX(va)]; 235 if (!l1pte_valid(pd)) 236 goto invalid; 237 if (l1pte_section_p(pd)) { 238 /* 1MB section mapping. */ 239 *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET); 240 return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE)); 241 } 242 pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 243 _kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE); 244 if (lseek(kd->pmfd, pte_pa, 0) == -1) { 245 _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek"); 246 goto invalid; 247 } 248 if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) { 249 _kvm_syserr(kd, kd->program, "_kvm_kvatop: read"); 250 goto invalid; 251 } 252 if (!l2pte_valid(pte)) { 253 goto invalid; 254 } 255 if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { 256 *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); 257 return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE)); 258 } 259 *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); 260 return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE)); 261invalid: 262 _kvm_err(kd, 0, "Invalid address (%lx)", va); 263 return 0; 264} 265 266/* 267 * Machine-dependent initialization for ALL open kvm descriptors, 268 * not just those for a kernel crash dump. Some architectures 269 * have to deal with these NOT being constants! (i.e. m68k) 270 */ 271#ifdef FBSD_NOT_YET 272int 273_kvm_mdopen(kvm_t *kd) 274{ 275 276 kd->usrstack = USRSTACK; 277 kd->min_uva = VM_MIN_ADDRESS; 278 kd->max_uva = VM_MAXUSER_ADDRESS; 279 280 return (0); 281} 282#endif 283