On Ampere Altra systems, the sparse population of RAM within the physical address space causes the vm_page_dump bitmap to be much larger than necessary, increasing the size from ~8 Mib to > 2 Gib (and overflowing `int` for the size). Changing the page dump bitmap also changes the minidump file format, so changes are also necessary in libkvm. Reviewed by: jhb Approved by: scottl (implicit) MFC after: 1 week Sponsored by: Ampere Computing, Inc. Differential Revision: https://reviews.freebsd.org/D26131
280 lines
7.8 KiB
C
280 lines
7.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2008 Semihalf, Grzegorz Bernacki
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* Copyright (c) 2006 Peter Wemm
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: FreeBSD: src/lib/libkvm/kvm_minidump_i386.c,v 1.2 2006/06/05 08:51:14
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* ARM machine dependent routines for kvm and minidumps.
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*/
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#include <sys/endian.h>
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#include <sys/param.h>
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#include <vm/vm.h>
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#include <kvm.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "../../sys/arm/include/minidump.h"
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#include "kvm_private.h"
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#include "kvm_arm.h"
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#define arm_round_page(x) roundup2((kvaddr_t)(x), ARM_PAGE_SIZE)
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struct vmstate {
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struct minidumphdr hdr;
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unsigned char ei_data;
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};
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static arm_pt_entry_t
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_arm_pte_get(kvm_t *kd, u_long pteindex)
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{
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arm_pt_entry_t *pte = _kvm_pmap_get(kd, pteindex, sizeof(*pte));
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return _kvm32toh(kd, *pte);
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}
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static int
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_arm_minidump_probe(kvm_t *kd)
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{
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return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) &&
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_kvm_is_minidump(kd));
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}
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static void
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_arm_minidump_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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free(vm);
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kd->vmst = NULL;
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}
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static int
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_arm_minidump_initvtop(kvm_t *kd)
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{
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struct vmstate *vmst;
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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,
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sizeof(vmst->hdr), 0) != sizeof(vmst->hdr)) {
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_kvm_err(kd, kd->program, "cannot read dump header");
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return (-1);
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}
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if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic,
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sizeof(vmst->hdr.magic)) != 0) {
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_kvm_err(kd, kd->program, "not a minidump for this platform");
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return (-1);
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}
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vmst->hdr.version = _kvm32toh(kd, vmst->hdr.version);
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if (vmst->hdr.version != MINIDUMP_VERSION && 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 = _kvm32toh(kd, vmst->hdr.msgbufsize);
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vmst->hdr.bitmapsize = _kvm32toh(kd, vmst->hdr.bitmapsize);
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vmst->hdr.ptesize = _kvm32toh(kd, vmst->hdr.ptesize);
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vmst->hdr.kernbase = _kvm32toh(kd, vmst->hdr.kernbase);
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vmst->hdr.arch = _kvm32toh(kd, vmst->hdr.arch);
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vmst->hdr.mmuformat = _kvm32toh(kd, vmst->hdr.mmuformat);
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if (vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_UNKNOWN) {
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/* This is a safe default as 1K pages are not used. */
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vmst->hdr.mmuformat = MINIDUMP_MMU_FORMAT_V6;
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}
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vmst->hdr.dumpavailsize = vmst->hdr.version == MINIDUMP_VERSION ?
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_kvm32toh(kd, vmst->hdr.dumpavailsize) : 0;
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/* Skip header and msgbuf */
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dump_avail_off = ARM_PAGE_SIZE + arm_round_page(vmst->hdr.msgbufsize);
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/* Skip dump_avail */
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off = dump_avail_off + arm_round_page(vmst->hdr.dumpavailsize);
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sparse_off = off + arm_round_page(vmst->hdr.bitmapsize) +
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arm_round_page(vmst->hdr.ptesize);
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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, ARM_PAGE_SIZE,
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sizeof(uint32_t)) == -1) {
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return (-1);
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}
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off += arm_round_page(vmst->hdr.bitmapsize);
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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 += arm_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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_arm_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
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{
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struct vmstate *vm;
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arm_pt_entry_t pte;
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arm_physaddr_t offset, a;
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kvaddr_t pteindex;
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off_t ofs;
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "_arm_minidump_kvatop called in live kernel!");
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return (0);
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}
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vm = kd->vmst;
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> ARM_PAGE_SHIFT;
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if (pteindex >= vm->hdr.ptesize / sizeof(pte))
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goto invalid;
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pte = _arm_pte_get(kd, pteindex);
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV) {
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_kvm_err(kd, kd->program,
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"_arm_minidump_kvatop: pte not valid");
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goto invalid;
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}
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
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/* 64K page -> convert to be like 4K page */
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offset = va & ARM_L2_S_OFFSET;
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a = (pte & ARM_L2_L_FRAME) +
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(va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
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} else {
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if (kd->vmst->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
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(pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
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_kvm_err(kd, kd->program,
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"_arm_minidump_kvatop: pte not supported");
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goto invalid;
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}
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/* 4K page */
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offset = va & ARM_L2_S_OFFSET;
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a = pte & ARM_L2_S_FRAME;
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}
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ofs = _kvm_pt_find(kd, a, ARM_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_arm_minidump_kvatop: "
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"physical address 0x%jx not in minidump",
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(uintmax_t)a);
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goto invalid;
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}
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*pa = ofs + offset;
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return (ARM_PAGE_SIZE - offset);
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} else
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_kvm_err(kd, kd->program, "_arm_minidump_kvatop: virtual "
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"address 0x%jx not minidumped", (uintmax_t)va);
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
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return (0);
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}
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static vm_prot_t
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_arm_entry_to_prot(kvm_t *kd, arm_pt_entry_t pte)
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{
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struct vmstate *vm = kd->vmst;
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vm_prot_t prot = VM_PROT_READ;
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/* Source: arm/arm/pmap-v4.c:pmap_fault_fixup() */
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if (vm->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4) {
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if (pte & ARM_L2_S_PROT_W)
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prot |= VM_PROT_WRITE;
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return prot;
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}
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/* Source: arm/arm/pmap-v6.c:pmap_protect() */
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if ((pte & ARM_PTE2_RO) == 0)
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prot |= VM_PROT_WRITE;
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if ((pte & ARM_PTE2_NX) == 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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_arm_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.ptesize / sizeof(arm_pt_entry_t);
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u_long dva, pa, pteindex, va;
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for (pteindex = 0; pteindex < nptes; pteindex++) {
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arm_pt_entry_t pte = _arm_pte_get(kd, pteindex);
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_INV)
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continue;
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va = vm->hdr.kernbase + (pteindex << ARM_PAGE_SHIFT);
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if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) {
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/* 64K page */
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pa = (pte & ARM_L2_L_FRAME) +
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(va & ARM_L2_L_OFFSET & ARM_L2_S_FRAME);
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} else {
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if (vm->hdr.mmuformat == MINIDUMP_MMU_FORMAT_V4 &&
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(pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_T) {
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continue;
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}
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/* 4K page */
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pa = pte & ARM_L2_S_FRAME;
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}
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dva = 0; /* no direct map on this platform */
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if (!_kvm_visit_cb(kd, cb, arg, pa, va, dva,
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_arm_entry_to_prot(kd, pte), ARM_PAGE_SIZE, 0))
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return (0);
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}
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return (1);
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}
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static struct kvm_arch kvm_arm_minidump = {
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.ka_probe = _arm_minidump_probe,
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.ka_initvtop = _arm_minidump_initvtop,
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.ka_freevtop = _arm_minidump_freevtop,
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.ka_kvatop = _arm_minidump_kvatop,
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.ka_native = _arm_native,
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.ka_walk_pages = _arm_minidump_walk_pages,
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};
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KVM_ARCH(kvm_arm_minidump);
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