5e53a4f90f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
342 lines
8.4 KiB
C
342 lines
8.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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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* i386 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/i386/include/minidump.h"
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#include <limits.h>
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#include "kvm_private.h"
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#include "kvm_i386.h"
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#define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE)
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struct vmstate {
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struct minidumphdr hdr;
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};
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static i386_pte_pae_t
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_i386_pte_pae_get(kvm_t *kd, u_long pteindex)
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{
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i386_pte_pae_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 i386_pte_t
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_i386_pte_get(kvm_t *kd, u_long pteindex)
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{
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i386_pte_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
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return le32toh(*pte);
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}
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static int
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_i386_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
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_kvm_is_minidump(kd));
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}
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static void
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_i386_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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_i386_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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off_t 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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vmst->hdr.version = le32toh(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. 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.ptesize = le32toh(vmst->hdr.ptesize);
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vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase);
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vmst->hdr.paemode = le32toh(vmst->hdr.paemode);
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/* Skip header and msgbuf */
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off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize);
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sparse_off = off + i386_round_page(vmst->hdr.bitmapsize) +
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i386_round_page(vmst->hdr.ptesize);
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if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off,
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I386_PAGE_SIZE, sizeof(uint32_t)) == -1) {
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return (-1);
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}
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off += i386_round_page(vmst->hdr.bitmapsize);
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if (_kvm_pmap_init(kd, vmst->hdr.ptesize, off) == -1) {
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return (-1);
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}
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off += i386_round_page(vmst->hdr.ptesize);
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return (0);
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}
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static int
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_i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm;
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i386_physaddr_pae_t offset;
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i386_pte_pae_t pte;
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kvaddr_t pteindex;
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i386_physaddr_pae_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & I386_PAGE_MASK;
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
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if (pteindex >= vm->hdr.ptesize / sizeof(pte))
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goto invalid;
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pte = _i386_pte_pae_get(kd, pteindex);
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if ((pte & I386_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_i386_minidump_vatop_pae: pte not valid");
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goto invalid;
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}
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a = pte & I386_PG_FRAME_PAE;
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ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_i386_minidump_vatop_pae: 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 (I386_PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_i386_minidump_vatop_pae: 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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_i386_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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i386_physaddr_t offset;
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i386_pte_t pte;
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kvaddr_t pteindex;
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i386_physaddr_t a;
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off_t ofs;
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vm = kd->vmst;
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offset = va & I386_PAGE_MASK;
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
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if (pteindex >= vm->hdr.ptesize / sizeof(pte))
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goto invalid;
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pte = _i386_pte_get(kd, pteindex);
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if ((pte & I386_PG_V) == 0) {
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_kvm_err(kd, kd->program,
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"_i386_minidump_vatop: pte not valid");
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goto invalid;
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}
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a = pte & I386_PG_FRAME;
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ofs = _kvm_pt_find(kd, a, I386_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program,
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"_i386_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 (I386_PAGE_SIZE - offset);
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} else {
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_kvm_err(kd, kd->program,
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"_i386_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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_i386_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, "_i386_minidump_kvatop called in live kernel!");
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return (0);
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}
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if (kd->vmst->hdr.paemode)
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return (_i386_minidump_vatop_pae(kd, va, pa));
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else
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return (_i386_minidump_vatop(kd, va, pa));
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}
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static vm_prot_t
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_i386_entry_to_prot(uint64_t pte)
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{
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vm_prot_t prot = VM_PROT_READ;
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/* Source: i386/pmap.c:pmap_protect() */
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if (pte & I386_PG_RW)
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prot |= VM_PROT_WRITE;
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if ((pte & I386_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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struct i386_iter {
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kvm_t *kd;
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u_long nptes;
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u_long pteindex;
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};
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static void
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_i386_iterator_init(struct i386_iter *it, kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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it->kd = kd;
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it->pteindex = 0;
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if (vm->hdr.paemode) {
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it->nptes = vm->hdr.ptesize / sizeof(i386_pte_pae_t);
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} else {
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it->nptes = vm->hdr.ptesize / sizeof(i386_pte_t);
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}
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return;
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}
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static int
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_i386_iterator_next(struct i386_iter *it, u_long *pa, u_long *va, u_long *dva,
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vm_prot_t *prot)
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{
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struct vmstate *vm = it->kd->vmst;
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i386_pte_t pte32;
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i386_pte_pae_t pte64;
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int found = 0;
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*dva = 0;
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*pa = 0;
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*va = 0;
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*dva = 0;
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*prot = 0;
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for (; it->pteindex < it->nptes && found == 0; it->pteindex++) {
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if (vm->hdr.paemode) {
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pte64 = _i386_pte_pae_get(it->kd, it->pteindex);
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if ((pte64 & I386_PG_V) == 0)
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continue;
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*prot = _i386_entry_to_prot(pte64);
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*pa = pte64 & I386_PG_FRAME_PAE;
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} else {
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pte32 = _i386_pte_get(it->kd, it->pteindex);
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if ((pte32 & I386_PG_V) == 0)
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continue;
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*prot = _i386_entry_to_prot(pte32);
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*pa = pte32 & I386_PG_FRAME;
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}
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*va = vm->hdr.kernbase + (it->pteindex << I386_PAGE_SHIFT);
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found = 1;
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}
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return found;
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}
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static int
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_i386_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
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{
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struct i386_iter it;
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u_long dva, pa, va;
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vm_prot_t prot;
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_i386_iterator_init(&it, kd);
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while (_i386_iterator_next(&it, &pa, &va, &dva, &prot)) {
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if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
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prot, I386_PAGE_SIZE, 0)) {
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return (0);
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}
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}
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return (1);
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}
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static struct kvm_arch kvm_i386_minidump = {
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.ka_probe = _i386_minidump_probe,
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.ka_initvtop = _i386_minidump_initvtop,
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.ka_freevtop = _i386_minidump_freevtop,
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.ka_kvatop = _i386_minidump_kvatop,
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.ka_native = _i386_native,
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.ka_walk_pages = _i386_minidump_walk_pages,
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};
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KVM_ARCH(kvm_i386_minidump);
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