f2e36d47e3
To allow for a future 16k or 64k page size we need to tell libkvm which is being used. Add a flag field in unused space in minidumphdr and use it to signal between the different options. Reviewed by: markj Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D34548
326 lines
8.8 KiB
C
326 lines
8.8 KiB
C
/*-
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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_amd64.c r261799
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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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* ARM64 (AArch64) machine dependent routines for kvm and minidumps.
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*/
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#include <sys/param.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 <vm/vm.h>
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#include <kvm.h>
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#include "../../sys/arm64/include/minidump.h"
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#include <limits.h>
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#include "kvm_private.h"
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#include "kvm_aarch64.h"
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#define aarch64_round_page(x, size) roundup2((kvaddr_t)(x), size)
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#define aarch64_trunc_page(x, size) rounddown2((kvaddr_t)(x), size)
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struct vmstate {
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struct minidumphdr hdr;
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size_t page_size;
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u_int l3_shift;
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};
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static aarch64_pte_t
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_aarch64_pte_get(kvm_t *kd, u_long pteindex)
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{
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aarch64_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
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return le64toh(*pte);
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}
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static int
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_aarch64_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_AARCH64) &&
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_kvm_is_minidump(kd));
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}
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static void
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_aarch64_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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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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_aarch64_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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off_t off, dump_avail_off, sparse_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, sizeof(vmst->hdr), 0) !=
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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 = le32toh(vmst->hdr.version);
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if (vmst->hdr.version > MINIDUMP_VERSION || vmst->hdr.version < 1) {
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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 = le32toh(vmst->hdr.msgbufsize);
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vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
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vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize);
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vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase);
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vmst->hdr.dmapphys = le64toh(vmst->hdr.dmapphys);
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vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase);
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vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
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/* dumpavailsize added in version 2 */
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if (vmst->hdr.version >= 2) {
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vmst->hdr.dumpavailsize = le32toh(vmst->hdr.dumpavailsize);
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} else {
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vmst->hdr.dumpavailsize = 0;
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}
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/* flags added in version 3 */
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if (vmst->hdr.version >= 3) {
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vmst->hdr.flags = le32toh(vmst->hdr.flags);
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} else {
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vmst->hdr.flags = MINIDUMP_FLAG_PS_4K;
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}
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switch (vmst->hdr.flags & MINIDUMP_FLAG_PS_MASK) {
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case MINIDUMP_FLAG_PS_4K:
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vmst->page_size = AARCH64_PAGE_SIZE_4K;
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vmst->l3_shift = AARCH64_L3_SHIFT_4K;
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break;
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case MINIDUMP_FLAG_PS_16K:
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vmst->page_size = AARCH64_PAGE_SIZE_16K;
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vmst->l3_shift = AARCH64_L3_SHIFT_16K;
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break;
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default:
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_kvm_err(kd, kd->program, "unknown page size flag %x",
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vmst->hdr.flags & MINIDUMP_FLAG_PS_MASK);
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return (-1);
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}
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/* Skip header and msgbuf */
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dump_avail_off = vmst->page_size +
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aarch64_round_page(vmst->hdr.msgbufsize, vmst->page_size);
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/* Skip dump_avail */
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off = dump_avail_off +
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aarch64_round_page(vmst->hdr.dumpavailsize, vmst->page_size);
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/* build physical address lookup table for sparse pages */
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sparse_off = off +
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aarch64_round_page(vmst->hdr.bitmapsize, vmst->page_size) +
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aarch64_round_page(vmst->hdr.pmapsize, vmst->page_size);
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if (_kvm_pt_init(kd, vmst->hdr.dumpavailsize, dump_avail_off,
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vmst->hdr.bitmapsize, off, sparse_off, vmst->page_size) == -1) {
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return (-1);
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}
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off += aarch64_round_page(vmst->hdr.bitmapsize, vmst->page_size);
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if (_kvm_pmap_init(kd, vmst->hdr.pmapsize, off) == -1) {
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return (-1);
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}
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off += aarch64_round_page(vmst->hdr.pmapsize, vmst->page_size);
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return (0);
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}
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static int
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_aarch64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm;
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aarch64_physaddr_t offset;
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aarch64_pte_t l3;
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kvaddr_t l3_index;
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aarch64_physaddr_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & (kd->vmst->page_size - 1);
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if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = aarch64_trunc_page(va - vm->hdr.dmapbase + vm->hdr.dmapphys,
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kd->vmst->page_size);
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ofs = _kvm_pt_find(kd, a, kd->vmst->page_size);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_aarch64_minidump_vatop: "
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"direct map address 0x%jx not in minidump",
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(uintmax_t)va);
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goto invalid;
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}
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*pa = ofs + offset;
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return (kd->vmst->page_size - offset);
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} else if (va >= vm->hdr.kernbase) {
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l3_index = (va - vm->hdr.kernbase) >> kd->vmst->l3_shift;
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if (l3_index >= vm->hdr.pmapsize / sizeof(l3))
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goto invalid;
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l3 = _aarch64_pte_get(kd, l3_index);
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if ((l3 & AARCH64_ATTR_DESCR_MASK) != AARCH64_L3_PAGE) {
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_kvm_err(kd, kd->program,
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"_aarch64_minidump_vatop: pde not valid");
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goto invalid;
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}
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a = l3 & ~AARCH64_ATTR_MASK;
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ofs = _kvm_pt_find(kd, a, kd->vmst->page_size);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_aarch64_minidump_vatop: "
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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 (kd->vmst->page_size - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_aarch64_minidump_vatop: virtual address 0x%jx not minidumped",
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(uintmax_t)va);
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goto invalid;
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}
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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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static int
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_aarch64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0,
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"_aarch64_minidump_kvatop called in live kernel!");
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return (0);
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}
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return (_aarch64_minidump_vatop(kd, va, pa));
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}
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static int
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_aarch64_native(kvm_t *kd __unused)
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{
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#ifdef __aarch64__
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return (1);
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#else
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return (0);
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#endif
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}
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static vm_prot_t
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_aarch64_entry_to_prot(aarch64_pte_t pte)
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{
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vm_prot_t prot = VM_PROT_READ;
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/* Source: arm64/arm64/pmap.c:pmap_protect() */
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if ((pte & AARCH64_ATTR_AP(AARCH64_ATTR_AP_RO)) == 0)
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prot |= VM_PROT_WRITE;
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if ((pte & AARCH64_ATTR_XN) == 0)
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prot |= VM_PROT_EXECUTE;
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return prot;
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}
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static int
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_aarch64_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
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{
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struct vmstate *vm = kd->vmst;
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u_long nptes = vm->hdr.pmapsize / sizeof(aarch64_pte_t);
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u_long bmindex, dva, pa, pteindex, va;
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struct kvm_bitmap bm;
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vm_prot_t prot;
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int ret = 0;
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if (!_kvm_bitmap_init(&bm, vm->hdr.bitmapsize, &bmindex))
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return (0);
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for (pteindex = 0; pteindex < nptes; pteindex++) {
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aarch64_pte_t pte = _aarch64_pte_get(kd, pteindex);
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if ((pte & AARCH64_ATTR_DESCR_MASK) != AARCH64_L3_PAGE)
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continue;
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va = vm->hdr.kernbase + (pteindex << kd->vmst->l3_shift);
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pa = pte & ~AARCH64_ATTR_MASK;
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dva = vm->hdr.dmapbase + pa;
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if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
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_aarch64_entry_to_prot(pte), kd->vmst->page_size, 0)) {
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goto out;
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}
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}
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while (_kvm_bitmap_next(&bm, &bmindex)) {
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pa = _kvm_bit_id_pa(kd, bmindex, kd->vmst->page_size);
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if (pa == _KVM_PA_INVALID)
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break;
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dva = vm->hdr.dmapbase + pa;
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if (vm->hdr.dmapend < (dva + kd->vmst->page_size))
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break;
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va = 0;
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prot = VM_PROT_READ | VM_PROT_WRITE;
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if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
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prot, kd->vmst->page_size, 0)) {
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goto out;
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}
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}
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ret = 1;
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out:
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_kvm_bitmap_deinit(&bm);
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return (ret);
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}
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static struct kvm_arch kvm_aarch64_minidump = {
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.ka_probe = _aarch64_minidump_probe,
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.ka_initvtop = _aarch64_minidump_initvtop,
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.ka_freevtop = _aarch64_minidump_freevtop,
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.ka_kvatop = _aarch64_minidump_kvatop,
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.ka_native = _aarch64_native,
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.ka_walk_pages = _aarch64_minidump_walk_pages,
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};
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KVM_ARCH(kvm_aarch64_minidump);
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