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![Warner Losh](/assets/img/avatar_default.png)
The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch up to that fact and revert to their recommended match of BSD-2-Clause. Discussed with: pfg MFC After: 3 days Sponsored by: Netflix
443 lines
12 KiB
C
443 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* AMD64 machine dependent routines for kvm and minidumps.
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*/
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#include <sys/param.h>
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#include <sys/endian.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/amd64/include/minidump.h"
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#include <limits.h>
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#include "kvm_private.h"
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#include "kvm_amd64.h"
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#define amd64_round_page(x) roundup2((kvaddr_t)(x), AMD64_PAGE_SIZE)
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#define VM_IS_V1(vm) (vm->hdr.version == 1)
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#define VA_OFF(vm, va) \
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(VM_IS_V1(vm) ? ((va) & (AMD64_PAGE_SIZE - 1)) : ((va) & AMD64_PAGE_MASK))
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struct vmstate {
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struct minidumphdr hdr;
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};
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static vm_prot_t
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_amd64_entry_to_prot(uint64_t entry)
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{
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vm_prot_t prot = VM_PROT_READ;
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if ((entry & AMD64_PG_RW) != 0)
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prot |= VM_PROT_WRITE;
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if ((entry & AMD64_PG_NX) == 0)
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prot |= VM_PROT_EXECUTE;
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return prot;
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}
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/*
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* Version 2 minidumps use page directory entries, while version 1 use page
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* table entries.
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*/
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static amd64_pde_t
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_amd64_pde_get(kvm_t *kd, u_long pdeindex)
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{
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amd64_pde_t *pde = _kvm_pmap_get(kd, pdeindex, sizeof(*pde));
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return le64toh(*pde);
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}
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static amd64_pte_t
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_amd64_pte_get(kvm_t *kd, u_long pteindex)
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{
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amd64_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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/* Get the first page table entry for a given page directory index. */
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static amd64_pte_t *
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_amd64_pde_first_pte(kvm_t *kd, u_long pdeindex)
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{
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u_long *pa;
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pa = _kvm_pmap_get(kd, pdeindex, sizeof(amd64_pde_t));
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if (pa == NULL)
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return NULL;
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return _kvm_map_get(kd, *pa & AMD64_PG_FRAME, AMD64_PAGE_SIZE);
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}
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static int
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_amd64_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_X86_64) &&
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_kvm_is_minidump(kd));
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}
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static void
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_amd64_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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_amd64_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, 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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/*
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* NB: amd64 minidump header is binary compatible between version 1
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* and version 2; version 3 adds the dumpavailsize field
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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. expected %d got %d",
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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.dmapbase = le64toh(vmst->hdr.dmapbase);
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vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
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vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ?
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le32toh(vmst->hdr.dumpavailsize) : 0;
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/* Skip header and msgbuf */
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dump_avail_off = AMD64_PAGE_SIZE + amd64_round_page(vmst->hdr.msgbufsize);
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/* Skip dump_avail */
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off = dump_avail_off + amd64_round_page(vmst->hdr.dumpavailsize);
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sparse_off = off + amd64_round_page(vmst->hdr.bitmapsize) +
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amd64_round_page(vmst->hdr.pmapsize);
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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, AMD64_PAGE_SIZE) == -1) {
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return (-1);
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}
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off += amd64_round_page(vmst->hdr.bitmapsize);
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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 += amd64_round_page(vmst->hdr.pmapsize);
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return (0);
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}
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static int
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_amd64_minidump_vatop_v1(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm;
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amd64_physaddr_t offset;
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amd64_pte_t pte;
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kvaddr_t pteindex;
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amd64_physaddr_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & AMD64_PAGE_MASK;
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> AMD64_PAGE_SHIFT;
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if (pteindex >= vm->hdr.pmapsize / sizeof(pte))
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goto invalid;
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pte = _amd64_pte_get(kd, pteindex);
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if ((pte & AMD64_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: pte not valid");
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goto invalid;
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}
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a = pte & AMD64_PG_FRAME;
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ofs = _kvm_pt_find(kd, a, AMD64_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: 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 (AMD64_PAGE_SIZE - offset);
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} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
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ofs = _kvm_pt_find(kd, a, AMD64_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: 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 (AMD64_PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop_v1: 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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_amd64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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amd64_pte_t pt[AMD64_NPTEPG];
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struct vmstate *vm;
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amd64_physaddr_t offset;
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amd64_pde_t pde;
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amd64_pte_t pte;
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kvaddr_t pteindex;
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kvaddr_t pdeindex;
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amd64_physaddr_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & AMD64_PAGE_MASK;
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if (va >= vm->hdr.kernbase) {
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pdeindex = (va - vm->hdr.kernbase) >> AMD64_PDRSHIFT;
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if (pdeindex >= vm->hdr.pmapsize / sizeof(pde))
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goto invalid;
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pde = _amd64_pde_get(kd, pdeindex);
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if ((pde & AMD64_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: pde not valid");
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goto invalid;
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}
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if ((pde & AMD64_PG_PS) == 0) {
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a = pde & AMD64_PG_FRAME;
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/* TODO: Just read the single PTE */
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ofs = _kvm_pt_find(kd, a, AMD64_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"cannot find page table entry for %ju",
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(uintmax_t)a);
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goto invalid;
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}
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if (pread(kd->pmfd, &pt, AMD64_PAGE_SIZE, ofs) !=
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AMD64_PAGE_SIZE) {
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_kvm_err(kd, kd->program,
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"cannot read page table entry for %ju",
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(uintmax_t)a);
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goto invalid;
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}
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pteindex = (va >> AMD64_PAGE_SHIFT) &
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(AMD64_NPTEPG - 1);
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pte = le64toh(pt[pteindex]);
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if ((pte & AMD64_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: pte not valid");
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goto invalid;
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}
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a = pte & AMD64_PG_FRAME;
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} else {
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a = pde & AMD64_PG_PS_FRAME;
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a += (va & AMD64_PDRMASK) ^ offset;
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}
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ofs = _kvm_pt_find(kd, a, AMD64_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: 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 (AMD64_PAGE_SIZE - offset);
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} else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
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ofs = _kvm_pt_find(kd, a, AMD64_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_amd64_minidump_vatop: 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 (AMD64_PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_amd64_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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_amd64_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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"_amd64_minidump_kvatop called in live kernel!");
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return (0);
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}
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if (((struct vmstate *)kd->vmst)->hdr.version == 1)
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return (_amd64_minidump_vatop_v1(kd, va, pa));
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else
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return (_amd64_minidump_vatop(kd, va, pa));
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}
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static int
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_amd64_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 npdes = vm->hdr.pmapsize / sizeof(amd64_pde_t);
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u_long bmindex, dva, pa, pdeindex, va;
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struct kvm_bitmap bm;
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int ret = 0;
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vm_prot_t prot;
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unsigned int pgsz = AMD64_PAGE_SIZE;
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if (vm->hdr.version < 2)
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return (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 (pdeindex = 0; pdeindex < npdes; pdeindex++) {
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amd64_pde_t pde = _amd64_pde_get(kd, pdeindex);
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amd64_pte_t *ptes;
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u_long i;
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va = vm->hdr.kernbase + (pdeindex << AMD64_PDRSHIFT);
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if ((pde & AMD64_PG_V) == 0)
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continue;
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if ((pde & AMD64_PG_PS) != 0) {
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/*
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* Large page. Iterate on each 4K page section
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* within this page. This differs from 4K pages in
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* that every page here uses the same PDE to
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* generate permissions.
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*/
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pa = (pde & AMD64_PG_PS_FRAME) +
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((va & AMD64_PDRMASK) ^ VA_OFF(vm, va));
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dva = vm->hdr.dmapbase + pa;
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_kvm_bitmap_set(&bm, _kvm_pa_bit_id(kd, pa, AMD64_PAGE_SIZE));
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if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
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_amd64_entry_to_prot(pde), AMD64_NBPDR, pgsz)) {
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goto out;
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}
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continue;
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}
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/* 4K pages: pde references another page of entries. */
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ptes = _amd64_pde_first_pte(kd, pdeindex);
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/* Ignore page directory pages that were not dumped. */
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if (ptes == NULL)
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continue;
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for (i = 0; i < AMD64_NPTEPG; i++) {
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amd64_pte_t pte = (u_long)ptes[i];
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pa = pte & AMD64_PG_FRAME;
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dva = vm->hdr.dmapbase + pa;
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if ((pte & AMD64_PG_V) != 0) {
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_kvm_bitmap_set(&bm,
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_kvm_pa_bit_id(kd, pa, AMD64_PAGE_SIZE));
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if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
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_amd64_entry_to_prot(pte), pgsz, 0)) {
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goto out;
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}
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}
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va += AMD64_PAGE_SIZE;
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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, AMD64_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 + pgsz))
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break;
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va = 0;
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/* amd64/pmap.c: create_pagetables(): dmap always R|W. */
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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, prot, pgsz, 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_amd64_minidump = {
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.ka_probe = _amd64_minidump_probe,
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.ka_initvtop = _amd64_minidump_initvtop,
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.ka_freevtop = _amd64_minidump_freevtop,
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.ka_kvatop = _amd64_minidump_kvatop,
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.ka_native = _amd64_native,
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.ka_walk_pages = _amd64_minidump_walk_pages,
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};
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KVM_ARCH(kvm_amd64_minidump);
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