kvm_arm.c revision 150874
1129207Scognet/* $NetBSD: kvm_powerpc.c,v 1.4 1998/02/03 06:50:07 mycroft Exp $ */ 2129207Scognet 3129207Scognet/*- 4129207Scognet * Copyright (C) 1996 Wolfgang Solfrank. 5129207Scognet * Copyright (C) 1996 TooLs GmbH. 6129207Scognet * All rights reserved. 7129207Scognet * 8129207Scognet * Redistribution and use in source and binary forms, with or without 9129207Scognet * modification, are permitted provided that the following conditions 10129207Scognet * are met: 11129207Scognet * 1. Redistributions of source code must retain the above copyright 12129207Scognet * notice, this list of conditions and the following disclaimer. 13129207Scognet * 2. Redistributions in binary form must reproduce the above copyright 14129207Scognet * notice, this list of conditions and the following disclaimer in the 15129207Scognet * documentation and/or other materials provided with the distribution. 16129207Scognet * 3. All advertising materials mentioning features or use of this software 17129207Scognet * must display the following acknowledgement: 18129207Scognet * This product includes software developed by TooLs GmbH. 19129207Scognet * 4. The name of TooLs GmbH may not be used to endorse or promote products 20129207Scognet * derived from this software without specific prior written permission. 21129207Scognet * 22129207Scognet * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23129207Scognet * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24129207Scognet * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25129207Scognet * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26129207Scognet * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27129207Scognet * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28129207Scognet * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29129207Scognet * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30129207Scognet * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31129207Scognet * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32129207Scognet */ 33129207Scognet 34129207Scognet/* 35129207Scognet * ARM machine dependent routines for kvm. 36129207Scognet */ 37129207Scognet 38129207Scognet#include <sys/cdefs.h> 39129207Scognet__FBSDID("$FreeBSD: head/lib/libkvm/kvm_arm.c 150874 2005-10-03 14:21:14Z cognet $"); 40129207Scognet 41129207Scognet#include <sys/param.h> 42150874Scognet#include <sys/elf32.h> 43150874Scognet#include <sys/mman.h> 44129207Scognet 45129207Scognet#include <vm/vm.h> 46150874Scognet#include <vm/vm_param.h> 47150874Scognet#include <vm/pmap.h> 48129207Scognet 49150874Scognet#include <machine/pmap.h> 50150874Scognet 51129207Scognet#include <db.h> 52129207Scognet#include <limits.h> 53129207Scognet#include <kvm.h> 54129207Scognet#include <stdlib.h> 55129207Scognet 56129207Scognet#include "kvm_private.h" 57129207Scognet 58150874Scognetstruct vmstate { 59150874Scognet pd_entry_t *l1pt; 60150874Scognet void *mmapbase; 61150874Scognet size_t mmapsize; 62150874Scognet}; 63150874Scognet 64150874Scognetstatic int 65150874Scognet_kvm_maphdrs(kvm_t *kd, size_t sz) 66150874Scognet{ 67150874Scognet struct vmstate *vm = kd->vmst; 68150874Scognet 69150874Scognet /* munmap() previous mmap(). */ 70150874Scognet if (vm->mmapbase != NULL) { 71150874Scognet munmap(vm->mmapbase, vm->mmapsize); 72150874Scognet vm->mmapbase = NULL; 73150874Scognet } 74150874Scognet 75150874Scognet vm->mmapsize = sz; 76150874Scognet vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 77150874Scognet if (vm->mmapbase == MAP_FAILED) { 78150874Scognet _kvm_err(kd, kd->program, "cannot mmap corefile"); 79150874Scognet return (-1); 80150874Scognet } 81150874Scognet 82150874Scognet return (0); 83150874Scognet} 84150874Scognet 85150874Scognet/* 86150874Scognet * Translate a physical memory address to a file-offset in the crash-dump. 87150874Scognet */ 88150874Scognetstatic size_t 89150874Scognet_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 90150874Scognet{ 91150874Scognet Elf32_Ehdr *e = kd->vmst->mmapbase; 92150874Scognet Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff); 93150874Scognet int n = e->e_phnum; 94150874Scognet 95150874Scognet while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 96150874Scognet p++, n--; 97150874Scognet if (n == 0) 98150874Scognet return (0); 99150874Scognet 100150874Scognet *ofs = (pa - p->p_paddr) + p->p_offset; 101150874Scognet if (pgsz == 0) 102150874Scognet return (p->p_memsz - (pa - p->p_paddr)); 103150874Scognet return (pgsz - ((size_t)pa & (pgsz - 1))); 104150874Scognet} 105150874Scognet 106129207Scognetvoid 107150874Scognet_kvm_freevtop(kvm_t *kd) 108129207Scognet{ 109150874Scognet if (kd->vmst != 0) { 110150874Scognet if (kd->vmst->mmapbase != NULL) 111150874Scognet munmap(kd->vmst->mmapbase, kd->vmst->mmapsize); 112129207Scognet free(kd->vmst); 113150874Scognet kd->vmst = NULL; 114150874Scognet } 115129207Scognet} 116129207Scognet 117129207Scognetint 118150874Scognet_kvm_initvtop(kvm_t *kd) 119129207Scognet{ 120150874Scognet struct vmstate *vm = _kvm_malloc(kd, sizeof(*vm)); 121150874Scognet struct nlist nlist[2]; 122150874Scognet u_long kernbase, physaddr, pa; 123150874Scognet pd_entry_t *l1pt; 124150874Scognet Elf32_Ehdr *ehdr; 125150874Scognet size_t hdrsz; 126150874Scognet 127150874Scognet if (vm == 0) { 128150874Scognet _kvm_err(kd, kd->program, "cannot allocate vm"); 129150874Scognet return (-1); 130150874Scognet } 131150874Scognet kd->vmst = vm; 132150874Scognet vm->l1pt = NULL; 133150874Scognet if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1) 134150874Scognet return (-1); 135150874Scognet ehdr = kd->vmst->mmapbase; 136150874Scognet hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 137150874Scognet if (_kvm_maphdrs(kd, hdrsz) == -1) 138150874Scognet return (-1); 139150874Scognet nlist[0].n_name = "kernbase"; 140150874Scognet nlist[1].n_name = NULL; 141150874Scognet if (kvm_nlist(kd, nlist) != 0) 142150874Scognet kernbase = KERNBASE; 143150874Scognet else 144150874Scognet kernbase = nlist[0].n_value; 145150874Scognet 146150874Scognet nlist[0].n_name = "physaddr"; 147150874Scognet if (kvm_nlist(kd, nlist) != 0) { 148150874Scognet _kvm_err(kd, kd->program, "couldn't get phys addr"); 149150874Scognet return (-1); 150150874Scognet } 151150874Scognet physaddr = nlist[0].n_value; 152150874Scognet nlist[0].n_name = "kernel_l1pa"; 153150874Scognet if (kvm_nlist(kd, nlist) != 0) { 154150874Scognet _kvm_err(kd, kd->program, "bad namelist"); 155150874Scognet return (-1); 156150874Scognet } 157150874Scognet if (kvm_read(kd, (nlist[0].n_value - kernbase + physaddr), &pa, 158150874Scognet sizeof(pa)) != sizeof(pa)) { 159150874Scognet _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 160150874Scognet return (-1); 161150874Scognet } 162150874Scognet l1pt = _kvm_malloc(kd, L1_TABLE_SIZE); 163150874Scognet if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) { 164150874Scognet _kvm_err(kd, kd->program, "cannot read l1pt"); 165150874Scognet free(l1pt); 166150874Scognet return (-1); 167150874Scognet } 168150874Scognet vm->l1pt = l1pt; 169129207Scognet return 0; 170129207Scognet} 171129207Scognet 172150874Scognet/* from arm/pmap.c */ 173150874Scognet#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT) 174150874Scognet/* from arm/pmap.h */ 175150874Scognet#define L1_TYPE_INV 0x00 /* Invalid (fault) */ 176150874Scognet#define L1_TYPE_C 0x01 /* Coarse L2 */ 177150874Scognet#define L1_TYPE_S 0x02 /* Section */ 178150874Scognet#define L1_TYPE_F 0x03 /* Fine L2 */ 179150874Scognet#define L1_TYPE_MASK 0x03 /* mask of type bits */ 180150874Scognet 181150874Scognet#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S) 182150874Scognet#define l1pte_valid(pde) ((pde) != 0) 183150874Scognet#define l2pte_valid(pte) ((pte) != 0) 184150874Scognet#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT) 185150874Scognet 186150874Scognet 187129207Scognetint 188150874Scognet_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 189129207Scognet{ 190150874Scognet u_long offset = va & (PAGE_SIZE - 1); 191150874Scognet struct vmstate *vm = kd->vmst; 192150874Scognet pd_entry_t pd; 193150874Scognet pt_entry_t pte; 194150874Scognet u_long pte_pa; 195129207Scognet 196150874Scognet if (vm->l1pt == NULL) 197150874Scognet return (_kvm_pa2off(kd, va, pa, PAGE_SIZE)); 198150874Scognet pd = vm->l1pt[L1_IDX(va)]; 199150874Scognet if (!l1pte_valid(pd)) 200150874Scognet goto invalid; 201150874Scognet if (l1pte_section_p(pd)) { 202150874Scognet /* 1MB section mapping. */ 203150874Scognet *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET); 204150874Scognet return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE)); 205150874Scognet } 206150874Scognet pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 207150874Scognet _kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE); 208150874Scognet if (lseek(kd->pmfd, pte_pa, 0) == -1) { 209150874Scognet _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek"); 210150874Scognet goto invalid; 211150874Scognet } 212150874Scognet if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) { 213150874Scognet _kvm_syserr(kd, kd->program, "_kvm_kvatop: read"); 214150874Scognet goto invalid; 215150874Scognet } 216150874Scognet if (!l2pte_valid(pte)) { 217150874Scognet goto invalid; 218150874Scognet } 219150874Scognet if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { 220150874Scognet *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); 221150874Scognet return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE)); 222150874Scognet } 223150874Scognet *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); 224150874Scognet return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE)); 225150874Scognetinvalid: 226150874Scognet _kvm_err(kd, 0, "Invalid address (%x)", va); 227129207Scognet return 0; 228129207Scognet} 229129207Scognet 230129207Scognet/* 231129207Scognet * Machine-dependent initialization for ALL open kvm descriptors, 232129207Scognet * not just those for a kernel crash dump. Some architectures 233129207Scognet * have to deal with these NOT being constants! (i.e. m68k) 234129207Scognet */ 235129207Scognetint 236129207Scognet_kvm_mdopen(kd) 237129207Scognet kvm_t *kd; 238129207Scognet{ 239129207Scognet 240129207Scognet#ifdef FBSD_NOT_YET 241129207Scognet kd->usrstack = USRSTACK; 242129207Scognet kd->min_uva = VM_MIN_ADDRESS; 243129207Scognet kd->max_uva = VM_MAXUSER_ADDRESS; 244129207Scognet#endif 245129207Scognet 246129207Scognet return (0); 247129207Scognet} 248