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: releng/11.0/lib/libkvm/kvm_arm.c 298485 2016-04-22 18:05:34Z ngie $"); 40129207Scognet 41129207Scognet#include <sys/param.h> 42291406Sjhb#include <sys/endian.h> 43291406Sjhb#include <kvm.h> 44129207Scognet#include <limits.h> 45291406Sjhb#include <stdint.h> 46129207Scognet#include <stdlib.h> 47184728Sraj#include <unistd.h> 48129207Scognet 49291406Sjhb#ifdef __arm__ 50291406Sjhb#include <machine/vmparam.h> 51291406Sjhb#endif 52291406Sjhb 53129207Scognet#include "kvm_private.h" 54291406Sjhb#include "kvm_arm.h" 55129207Scognet 56150874Scognetstruct vmstate { 57291406Sjhb arm_pd_entry_t *l1pt; 58291406Sjhb size_t phnum; 59291406Sjhb GElf_Phdr *phdr; 60150874Scognet}; 61150874Scognet 62150874Scognet/* 63150874Scognet * Translate a physical memory address to a file-offset in the crash-dump. 64150874Scognet */ 65150874Scognetstatic size_t 66150874Scognet_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) 67150874Scognet{ 68291406Sjhb struct vmstate *vm = kd->vmst; 69291406Sjhb GElf_Phdr *p; 70291406Sjhb size_t n; 71150874Scognet 72291406Sjhb p = vm->phdr; 73291406Sjhb n = vm->phnum; 74150874Scognet while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) 75150874Scognet p++, n--; 76150874Scognet if (n == 0) 77150874Scognet return (0); 78150874Scognet 79150874Scognet *ofs = (pa - p->p_paddr) + p->p_offset; 80150874Scognet if (pgsz == 0) 81150874Scognet return (p->p_memsz - (pa - p->p_paddr)); 82150874Scognet return (pgsz - ((size_t)pa & (pgsz - 1))); 83150874Scognet} 84150874Scognet 85291406Sjhbstatic void 86291406Sjhb_arm_freevtop(kvm_t *kd) 87129207Scognet{ 88291406Sjhb struct vmstate *vm = kd->vmst; 89291406Sjhb 90291406Sjhb free(vm->phdr); 91291406Sjhb free(vm); 92291406Sjhb kd->vmst = NULL; 93129207Scognet} 94129207Scognet 95291406Sjhbstatic int 96291406Sjhb_arm_probe(kvm_t *kd) 97129207Scognet{ 98291406Sjhb 99291406Sjhb return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && 100291406Sjhb !_kvm_is_minidump(kd)); 101291406Sjhb} 102291406Sjhb 103291406Sjhbstatic int 104291406Sjhb_arm_initvtop(kvm_t *kd) 105291406Sjhb{ 106184728Sraj struct vmstate *vm; 107291406Sjhb struct kvm_nlist nl[2]; 108291406Sjhb kvaddr_t kernbase; 109291406Sjhb arm_physaddr_t physaddr, pa; 110291406Sjhb arm_pd_entry_t *l1pt; 111291406Sjhb size_t i; 112291406Sjhb int found; 113184728Sraj 114291406Sjhb if (kd->rawdump) { 115291406Sjhb _kvm_err(kd, kd->program, "raw dumps not supported on arm"); 116291406Sjhb return (-1); 117184728Sraj } 118184728Sraj 119184728Sraj vm = _kvm_malloc(kd, sizeof(*vm)); 120298485Sngie if (vm == NULL) { 121150874Scognet _kvm_err(kd, kd->program, "cannot allocate vm"); 122150874Scognet return (-1); 123150874Scognet } 124150874Scognet kd->vmst = vm; 125150874Scognet vm->l1pt = NULL; 126291406Sjhb 127291406Sjhb if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1) 128150874Scognet return (-1); 129273284Sandrew 130273284Sandrew found = 0; 131291406Sjhb for (i = 0; i < vm->phnum; i++) { 132291406Sjhb if (vm->phdr[i].p_type == PT_DUMP_DELTA) { 133291406Sjhb kernbase = vm->phdr[i].p_vaddr; 134291406Sjhb physaddr = vm->phdr[i].p_paddr; 135273284Sandrew found = 1; 136273284Sandrew break; 137273284Sandrew } 138273284Sandrew } 139273284Sandrew 140217744Suqs nl[1].n_name = NULL; 141273284Sandrew if (!found) { 142273284Sandrew nl[0].n_name = "kernbase"; 143291406Sjhb if (kvm_nlist2(kd, nl) != 0) { 144291406Sjhb#ifdef __arm__ 145273284Sandrew kernbase = KERNBASE; 146291406Sjhb#else 147291406Sjhb _kvm_err(kd, kd->program, "cannot resolve kernbase"); 148291406Sjhb return (-1); 149291406Sjhb#endif 150291406Sjhb } else 151273284Sandrew kernbase = nl[0].n_value; 152150874Scognet 153273284Sandrew nl[0].n_name = "physaddr"; 154291406Sjhb if (kvm_nlist2(kd, nl) != 0) { 155273284Sandrew _kvm_err(kd, kd->program, "couldn't get phys addr"); 156273284Sandrew return (-1); 157273284Sandrew } 158273284Sandrew physaddr = nl[0].n_value; 159150874Scognet } 160217744Suqs nl[0].n_name = "kernel_l1pa"; 161291406Sjhb if (kvm_nlist2(kd, nl) != 0) { 162150874Scognet _kvm_err(kd, kd->program, "bad namelist"); 163150874Scognet return (-1); 164150874Scognet } 165291406Sjhb if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa, 166150874Scognet sizeof(pa)) != sizeof(pa)) { 167150874Scognet _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); 168150874Scognet return (-1); 169150874Scognet } 170291406Sjhb l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE); 171298485Sngie if (l1pt == NULL) { 172298485Sngie _kvm_err(kd, kd->program, "cannot allocate l1pt"); 173298485Sngie return (-1); 174298485Sngie } 175291406Sjhb if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) { 176150874Scognet _kvm_err(kd, kd->program, "cannot read l1pt"); 177150874Scognet free(l1pt); 178150874Scognet return (-1); 179150874Scognet } 180150874Scognet vm->l1pt = l1pt; 181129207Scognet return 0; 182129207Scognet} 183129207Scognet 184150874Scognet/* from arm/pmap.c */ 185291406Sjhb#define ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT) 186150874Scognet 187291406Sjhb#define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S) 188150874Scognet#define l1pte_valid(pde) ((pde) != 0) 189150874Scognet#define l2pte_valid(pte) ((pte) != 0) 190295752Sskra#define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT) 191150874Scognet 192150874Scognet 193291406Sjhbstatic int 194291406Sjhb_arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) 195129207Scognet{ 196150874Scognet struct vmstate *vm = kd->vmst; 197291406Sjhb arm_pd_entry_t pd; 198291406Sjhb arm_pt_entry_t pte; 199291406Sjhb arm_physaddr_t pte_pa; 200291406Sjhb off_t pte_off; 201129207Scognet 202150874Scognet if (vm->l1pt == NULL) 203291406Sjhb return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE)); 204291406Sjhb pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]); 205150874Scognet if (!l1pte_valid(pd)) 206150874Scognet goto invalid; 207150874Scognet if (l1pte_section_p(pd)) { 208150874Scognet /* 1MB section mapping. */ 209291406Sjhb *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET); 210291406Sjhb return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE)); 211150874Scognet } 212291406Sjhb pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte); 213291406Sjhb _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE); 214291406Sjhb if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) { 215291406Sjhb _kvm_syserr(kd, kd->program, "_arm_kvatop: pread"); 216150874Scognet goto invalid; 217150874Scognet } 218291406Sjhb pte = _kvm32toh(kd, pte); 219150874Scognet if (!l2pte_valid(pte)) { 220150874Scognet goto invalid; 221150874Scognet } 222291406Sjhb if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { 223291406Sjhb *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET); 224291406Sjhb return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE)); 225150874Scognet } 226291406Sjhb *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET); 227291406Sjhb return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE)); 228150874Scognetinvalid: 229291406Sjhb _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va); 230129207Scognet return 0; 231129207Scognet} 232129207Scognet 233129207Scognet/* 234129207Scognet * Machine-dependent initialization for ALL open kvm descriptors, 235129207Scognet * not just those for a kernel crash dump. Some architectures 236129207Scognet * have to deal with these NOT being constants! (i.e. m68k) 237129207Scognet */ 238217744Suqs#ifdef FBSD_NOT_YET 239129207Scognetint 240217744Suqs_kvm_mdopen(kvm_t *kd) 241129207Scognet{ 242129207Scognet 243129207Scognet kd->usrstack = USRSTACK; 244129207Scognet kd->min_uva = VM_MIN_ADDRESS; 245129207Scognet kd->max_uva = VM_MAXUSER_ADDRESS; 246129207Scognet 247129207Scognet return (0); 248129207Scognet} 249217744Suqs#endif 250291406Sjhb 251291406Sjhbint 252291406Sjhb_arm_native(kvm_t *kd) 253291406Sjhb{ 254291406Sjhb 255291406Sjhb#ifdef __arm__ 256291406Sjhb#if _BYTE_ORDER == _LITTLE_ENDIAN 257291406Sjhb return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB); 258291406Sjhb#else 259291406Sjhb return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB); 260291406Sjhb#endif 261291406Sjhb#else 262291406Sjhb return (0); 263291406Sjhb#endif 264291406Sjhb} 265291406Sjhb 266291406Sjhbstruct kvm_arch kvm_arm = { 267291406Sjhb .ka_probe = _arm_probe, 268291406Sjhb .ka_initvtop = _arm_initvtop, 269291406Sjhb .ka_freevtop = _arm_freevtop, 270291406Sjhb .ka_kvatop = _arm_kvatop, 271291406Sjhb .ka_native = _arm_native, 272291406Sjhb}; 273291406Sjhb 274291406SjhbKVM_ARCH(kvm_arm); 275