240 lines
6.6 KiB
C
240 lines
6.6 KiB
C
/*-
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* Copyright (c) 2008 Semihalf, Grzegorz Bernacki
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* Copyright (c) 2006 Peter Wemm
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: FreeBSD: src/lib/libkvm/kvm_minidump_i386.c,v 1.2 2006/06/05 08:51:14
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* ARM machine dependent routines for kvm and minidumps.
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*/
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#include <sys/endian.h>
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#include <sys/param.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../../sys/arm/include/minidump.h"
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#include "kvm_private.h"
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#include "kvm_arm.h"
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#define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
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struct vmstate {
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struct minidumphdr hdr;
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struct hpt hpt;
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void *ptemap;
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unsigned char ei_data;
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};
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static int
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_arm_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
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_kvm_is_minidump(kd));
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}
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static void
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_arm_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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_kvm_hpt_free(&vm->hpt);
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if (vm->ptemap)
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free(vm->ptemap);
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_arm_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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uint32_t *bitmap;
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off_t off;
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vmst = _kvm_malloc(kd, sizeof(*vmst));
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if (vmst == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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kd->vmst = vmst;
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if (pread(kd->pmfd, &vmst->hdr,
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sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
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_kvm_err(kd, kd->program, "cannot read dump header");
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return (-1);
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}
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if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
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sizeof(vmst->hdr.magic)) != 0) {
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_kvm_err(kd, kd->program, "not a minidump for this platform");
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return (-1);
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}
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vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
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if (vmst->hdr.version != MINIDUMP_VERSION) {
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_kvm_err(kd, kd->program, "wrong minidump version. "
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"Expected %d got %d", MINIDUMP_VERSION, vmst->hdr.version);
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return (-1);
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}
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vmst->hdr.msgbufsize = _kvm32toh(kd, vmst->hdr.msgbufsize);
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vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
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vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
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vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
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vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
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vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
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if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
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/* This is a safe default as 1K pages are not used. */
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vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
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}
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/* Skip header and msgbuf */
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off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
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bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
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if (bitmap == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate %d bytes for "
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"bitmap", vmst->hdr.bitmapsize);
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return (-1);
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}
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if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
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(ssize_t)vmst->hdr.bitmapsize) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap",
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vmst->hdr.bitmapsize);
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free(bitmap);
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return (-1);
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}
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off += arm_round_page(vmst->hdr.bitmapsize);
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vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
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if (vmst->ptemap == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate %d bytes for "
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"ptemap", vmst->hdr.ptesize);
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free(bitmap);
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return (-1);
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}
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if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
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(ssize_t)vmst->hdr.ptesize) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for ptemap",
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vmst->hdr.ptesize);
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free(bitmap);
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return (-1);
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}
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off += vmst->hdr.ptesize;
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/* Build physical address hash table for sparse pages */
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_kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
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ARM_PAGE_SIZE, sizeof(*bitmap));
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free(bitmap);
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return (0);
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}
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static int
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_arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm;
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arm_pt_entry_t pte;
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arm_physaddr_t offset, a;
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kvaddr_t pteindex;
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off_t ofs;
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arm_pt_entry_t *ptemap;
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
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return (0);
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}
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vm = kd->vmst;
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ptemap = vm->ptemap;
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
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if (pteindex >= vm->hdr.ptesize / sizeof(*ptemap))
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goto invalid;
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pte = _kvm32toh(kd, ptemap[pteindex]);
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
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_kvm_err(kd, kd->program,
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"_arm_minidump_kvatop: pte not valid");
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goto invalid;
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}
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
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/* 64K page -> convert to be like 4K page */
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offset = va & ARM_L2_S_OFFSET;
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a = (pte & ARM_L2_L_FRAME) +
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(va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
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} else {
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if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
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(pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
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_kvm_err(kd, kd->program,
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"_arm_minidump_kvatop: pte not supported");
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goto invalid;
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}
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/* 4K page */
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offset = va & ARM_L2_S_OFFSET;
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a = pte & ARM_L2_S_FRAME;
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}
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ofs = _kvm_hpt_find(&vm->hpt, a);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
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"physical address 0x%jx not in minidump",
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(uintmax_t)a);
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goto invalid;
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}
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*pa = ofs + offset;
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return (ARM_PAGE_SIZE - offset);
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} else
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_kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
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"address 0x%jx not minidumped", (uintmax_t)va);
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
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return (0);
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}
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struct kvm_arch kvm_arm_minidump = {
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.ka_probe = _arm_minidump_probe,
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.ka_initvtop = _arm_minidump_initvtop,
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.ka_freevtop = _arm_minidump_freevtop,
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.ka_kvatop = _arm_minidump_kvatop,
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.ka_native = _arm_native,
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};
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KVM_ARCH(kvm_arm_minidump);
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