1129207Scognet/*- 2165895Simp * Copyright (c) 2005 Olivier Houchard 3165895Simp * Copyright (c) 1989, 1992, 1993 4165895Simp * The Regents of the University of California. All rights reserved. 5129207Scognet * 6165895Simp * This code is derived from software developed by the Computer Systems 7165895Simp * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 8165895Simp * BG 91-66 and contributed to Berkeley. 9165895Simp * 10129207Scognet * Redistribution and use in source and binary forms, with or without 11129207Scognet * modification, are permitted provided that the following conditions 12129207Scognet * are met: 13129207Scognet * 1. Redistributions of source code must retain the above copyright 14129207Scognet * notice, this list of conditions and the following disclaimer. 15129207Scognet * 2. Redistributions in binary form must reproduce the above copyright 16129207Scognet * notice, this list of conditions and the following disclaimer in the 17129207Scognet * documentation and/or other materials provided with the distribution. 18165895Simp * 4. Neither the name of the University nor the names of its contributors 19165895Simp * may be used to endorse or promote products derived from this software 20165895Simp * 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("$FreeBSD$"); 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> 55194186Sed#include <string.h> 56184728Sraj#include <unistd.h> 57129207Scognet 58129207Scognet#include "kvm_private.h" 59129207Scognet 60184728Sraj/* minidump must be the first item! */ 61150874Scognetstruct vmstate { 62184728Sraj int minidump; /* 1 = minidump mode */ 63150874Scognet pd_entry_t *l1pt; 64150874Scognet void *mmapbase; 65150874Scognet size_t mmapsize; 66150874Scognet}; 67150874Scognet 68150874Scognetstatic int 69150874Scognet_kvm_maphdrs(kvm_t *kd, size_t sz) 70150874Scognet{ 71150874Scognet struct vmstate *vm = kd->vmst; 72150874Scognet 73150874Scognet /* munmap() previous mmap(). */ 74150874Scognet if (vm->mmapbase != NULL) { 75150874Scognet munmap(vm->mmapbase, vm->mmapsize); 76150874Scognet vm->mmapbase = NULL; 77150874Scognet } 78150874Scognet 79150874Scognet vm->mmapsize = sz; 80150874Scognet vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); 81150874Scognet if (vm->mmapbase == MAP_FAILED) { 82150874Scognet _kvm_err(kd, kd->program, "cannot mmap corefile"); 83150874Scognet return (-1); 84150874Scognet } 85150874Scognet 86150874Scognet return (0); 87150874Scognet} 88150874Scognet 89150874Scognet/* 90150874Scognet * Translate a physical memory address to a file-offset in the crash-dump. 91150874Scognet */ 92150874Scognetstatic size_t 93150874Scognet_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 94150874Scognet{ 95150874Scognet Elf32_Ehdr *e = kd->vmst->mmapbase; 96150874Scognet Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff); 97150874Scognet int n = e->e_phnum; 98150874Scognet 99150874Scognet while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 100150874Scognet p++, n--; 101150874Scognet if (n == 0) 102150874Scognet return (0); 103150874Scognet 104150874Scognet *ofs = (pa - p->p_paddr) + p->p_offset; 105150874Scognet if (pgsz == 0) 106150874Scognet return (p->p_memsz - (pa - p->p_paddr)); 107150874Scognet return (pgsz - ((size_t)pa & (pgsz - 1))); 108150874Scognet} 109150874Scognet 110129207Scognetvoid 111150874Scognet_kvm_freevtop(kvm_t *kd) 112129207Scognet{ 113150874Scognet if (kd->vmst != 0) { 114184728Sraj if (kd->vmst->minidump) 115184728Sraj return (_kvm_minidump_freevtop(kd)); 116150874Scognet if (kd->vmst->mmapbase != NULL) 117150874Scognet munmap(kd->vmst->mmapbase, kd->vmst->mmapsize); 118129207Scognet free(kd->vmst); 119150874Scognet kd->vmst = NULL; 120150874Scognet } 121129207Scognet} 122129207Scognet 123129207Scognetint 124150874Scognet_kvm_initvtop(kvm_t *kd) 125129207Scognet{ 126184728Sraj struct vmstate *vm; 127217744Suqs struct nlist nl[2]; 128150874Scognet u_long kernbase, physaddr, pa; 129150874Scognet pd_entry_t *l1pt; 130150874Scognet Elf32_Ehdr *ehdr; 131150874Scognet size_t hdrsz; 132184728Sraj char minihdr[8]; 133184728Sraj 134184728Sraj if (!kd->rawdump) { 135184728Sraj if (pread(kd->pmfd, &minihdr, 8, 0) == 8) { 136184728Sraj if (memcmp(&minihdr, "minidump", 8) == 0) 137184728Sraj return (_kvm_minidump_initvtop(kd)); 138184728Sraj } else { 139184728Sraj _kvm_err(kd, kd->program, "cannot read header"); 140184728Sraj return (-1); 141184728Sraj } 142184728Sraj } 143184728Sraj 144184728Sraj vm = _kvm_malloc(kd, sizeof(*vm)); 145150874Scognet if (vm == 0) { 146150874Scognet _kvm_err(kd, kd->program, "cannot allocate vm"); 147150874Scognet return (-1); 148150874Scognet } 149150874Scognet kd->vmst = vm; 150150874Scognet vm->l1pt = NULL; 151150874Scognet if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1) 152150874Scognet return (-1); 153150874Scognet ehdr = kd->vmst->mmapbase; 154150874Scognet hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; 155150874Scognet if (_kvm_maphdrs(kd, hdrsz) == -1) 156150874Scognet return (-1); 157217744Suqs nl[0].n_name = "kernbase"; 158217744Suqs nl[1].n_name = NULL; 159217744Suqs if (kvm_nlist(kd, nl) != 0) 160150874Scognet kernbase = KERNBASE; 161150874Scognet else 162217744Suqs kernbase = nl[0].n_value; 163150874Scognet 164217744Suqs nl[0].n_name = "physaddr"; 165217744Suqs if (kvm_nlist(kd, nl) != 0) { 166150874Scognet _kvm_err(kd, kd->program, "couldn't get phys addr"); 167150874Scognet return (-1); 168150874Scognet } 169217744Suqs physaddr = nl[0].n_value; 170217744Suqs nl[0].n_name = "kernel_l1pa"; 171217744Suqs if (kvm_nlist(kd, nl) != 0) { 172150874Scognet _kvm_err(kd, kd->program, "bad namelist"); 173150874Scognet return (-1); 174150874Scognet } 175217744Suqs if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa, 176150874Scognet sizeof(pa)) != sizeof(pa)) { 177150874Scognet _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 178150874Scognet return (-1); 179150874Scognet } 180150874Scognet l1pt = _kvm_malloc(kd, L1_TABLE_SIZE); 181150874Scognet if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) { 182150874Scognet _kvm_err(kd, kd->program, "cannot read l1pt"); 183150874Scognet free(l1pt); 184150874Scognet return (-1); 185150874Scognet } 186150874Scognet vm->l1pt = l1pt; 187129207Scognet return 0; 188129207Scognet} 189129207Scognet 190150874Scognet/* from arm/pmap.c */ 191150874Scognet#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT) 192150874Scognet/* from arm/pmap.h */ 193150874Scognet#define L1_TYPE_INV 0x00 /* Invalid (fault) */ 194150874Scognet#define L1_TYPE_C 0x01 /* Coarse L2 */ 195150874Scognet#define L1_TYPE_S 0x02 /* Section */ 196150874Scognet#define L1_TYPE_F 0x03 /* Fine L2 */ 197150874Scognet#define L1_TYPE_MASK 0x03 /* mask of type bits */ 198150874Scognet 199150874Scognet#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S) 200150874Scognet#define l1pte_valid(pde) ((pde) != 0) 201150874Scognet#define l2pte_valid(pte) ((pte) != 0) 202150874Scognet#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT) 203150874Scognet 204150874Scognet 205129207Scognetint 206150874Scognet_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) 207129207Scognet{ 208150874Scognet struct vmstate *vm = kd->vmst; 209150874Scognet pd_entry_t pd; 210150874Scognet pt_entry_t pte; 211150874Scognet u_long pte_pa; 212129207Scognet 213184728Sraj if (kd->vmst->minidump) 214184728Sraj return (_kvm_minidump_kvatop(kd, va, pa)); 215184728Sraj 216150874Scognet if (vm->l1pt == NULL) 217150874Scognet return (_kvm_pa2off(kd, va, pa, PAGE_SIZE)); 218150874Scognet pd = vm->l1pt[L1_IDX(va)]; 219150874Scognet if (!l1pte_valid(pd)) 220150874Scognet goto invalid; 221150874Scognet if (l1pte_section_p(pd)) { 222150874Scognet /* 1MB section mapping. */ 223150874Scognet *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET); 224150874Scognet return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE)); 225150874Scognet } 226150874Scognet pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 227150874Scognet _kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE); 228150874Scognet if (lseek(kd->pmfd, pte_pa, 0) == -1) { 229150874Scognet _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek"); 230150874Scognet goto invalid; 231150874Scognet } 232150874Scognet if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) { 233150874Scognet _kvm_syserr(kd, kd->program, "_kvm_kvatop: read"); 234150874Scognet goto invalid; 235150874Scognet } 236150874Scognet if (!l2pte_valid(pte)) { 237150874Scognet goto invalid; 238150874Scognet } 239150874Scognet if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { 240150874Scognet *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); 241150874Scognet return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE)); 242150874Scognet } 243150874Scognet *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); 244150874Scognet return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE)); 245150874Scognetinvalid: 246217744Suqs _kvm_err(kd, 0, "Invalid address (%lx)", va); 247129207Scognet return 0; 248129207Scognet} 249129207Scognet 250129207Scognet/* 251129207Scognet * Machine-dependent initialization for ALL open kvm descriptors, 252129207Scognet * not just those for a kernel crash dump. Some architectures 253129207Scognet * have to deal with these NOT being constants! (i.e. m68k) 254129207Scognet */ 255217744Suqs#ifdef FBSD_NOT_YET 256129207Scognetint 257217744Suqs_kvm_mdopen(kvm_t *kd) 258129207Scognet{ 259129207Scognet 260129207Scognet kd->usrstack = USRSTACK; 261129207Scognet kd->min_uva = VM_MIN_ADDRESS; 262129207Scognet kd->max_uva = VM_MAXUSER_ADDRESS; 263129207Scognet 264129207Scognet return (0); 265129207Scognet} 266217744Suqs#endif 267