ea532c48b8
Instead of using a hash table to convert physical page addresses to offsets in the sparse page array, cache the number of bits set for each 4MB chunk of physical pages. Upon lookup, find the nearest cached population count, then add/subtract the number of bits from that point to the page's PTE bit. Then multiply by page size and add to the sparse page map's base offset. This replaces O(n) worst-case lookup with O(1) (plus a small number of bits to scan in the bitmap). Also, for a 128GB system, a typical kernel core of about 8GB will now only require ~4.5MB of RAM for this approach instead of ~48MB as with the hash table. More concretely, /usr/sbin/crashinfo against the same core improves from a max RSS of 188MB and wall time of 43.72s (33.25 user 2.94 sys) to 135MB and 9.43s (2.58 user 1.47 sys). Running "thread apply all bt" in kgdb has a similar RSS improvement, and wall time drops from 4.44s to 1.93s. Reviewed by: jhb Sponsored by: Backtrace I/O
237 lines
6.6 KiB
C
237 lines
6.6 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 <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) roundup2((kvaddr_t)(x), AARCH64_PAGE_SIZE)
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struct vmstate {
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struct minidumphdr hdr;
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uint64_t *page_map;
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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->page_map);
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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, 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) {
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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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/* Skip header and msgbuf */
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off = AARCH64_PAGE_SIZE + aarch64_round_page(vmst->hdr.msgbufsize);
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/* build physical address lookup table for sparse pages */
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sparse_off = off + aarch64_round_page(vmst->hdr.bitmapsize) +
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aarch64_round_page(vmst->hdr.pmapsize);
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if (_kvm_pt_init(kd, vmst->hdr.bitmapsize, off, sparse_off,
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AARCH64_PAGE_SIZE, sizeof(uint64_t)) == -1) {
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_kvm_err(kd, kd->program, "cannot load core bitmap");
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return (-1);
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}
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off += aarch64_round_page(vmst->hdr.bitmapsize);
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vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize);
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if (vmst->page_map == NULL) {
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_kvm_err(kd, kd->program,
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"cannot allocate %d bytes for page_map",
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vmst->hdr.pmapsize);
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return (-1);
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}
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/* This is the end of the dump, savecore may have truncated it. */
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/*
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* XXX: This doesn't make sense. The pmap is not at the end,
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* and if it is truncated we don't have any actual data (it's
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* all stored after the bitmap and pmap. -- jhb
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*/
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if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) <
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AARCH64_PAGE_SIZE) {
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_kvm_err(kd, kd->program, "cannot read %d bytes for page_map",
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vmst->hdr.pmapsize);
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return (-1);
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}
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off += aarch64_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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_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 & AARCH64_PAGE_MASK;
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if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
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a = (va - vm->hdr.dmapbase + vm->hdr.dmapphys) &
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~AARCH64_PAGE_MASK;
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ofs = _kvm_pt_find(kd, a);
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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 (AARCH64_PAGE_SIZE - offset);
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} else if (va >= vm->hdr.kernbase) {
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l3_index = (va - vm->hdr.kernbase) >> AARCH64_L3_SHIFT;
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if (l3_index >= vm->hdr.pmapsize / sizeof(*vm->page_map))
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goto invalid;
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l3 = le64toh(vm->page_map[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);
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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 (AARCH64_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)
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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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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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};
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KVM_ARCH(kvm_aarch64_minidump);
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