b957b18594
As of r365978, minidumps include a copy of dump_avail[]. This is an array of vm_paddr_t ranges. libkvm walks the array assuming that sizeof(vm_paddr_t) is equal to the platform "word size", but that's not correct on some platforms. For instance, i386 uses a 64-bit vm_paddr_t. Fix the problem by always dumping 64-bit addresses. On platforms where vm_paddr_t is 32 bits wide, namely arm and mips (sometimes), translate dump_avail[] to an array of uint64_t ranges. With this change, libkvm no longer needs to maintain a notion of the target word size, so get rid of it. This is a no-op on platforms where sizeof(vm_paddr_t) == 8. Reviewed by: alc, kib Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D27082
373 lines
9.6 KiB
C
373 lines
9.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2010 Oleksandr Tymoshenko
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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_arm.c r214223
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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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* MIPS machine dependent routines for kvm and minidumps.
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*/
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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/mips/include/cca.h"
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#define _KVM_MINIDUMP
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#include "../../sys/mips/include/cpuregs.h"
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#include "../../sys/mips/include/minidump.h"
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#include "kvm_private.h"
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#include "kvm_mips.h"
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#define mips_round_page(x) roundup2((kvaddr_t)(x), MIPS_PAGE_SIZE)
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struct vmstate {
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struct minidumphdr hdr;
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int pte_size;
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};
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static int
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_mips_minidump_probe(kvm_t *kd)
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{
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if (kd->nlehdr.e_ident[EI_CLASS] != ELFCLASS32 &&
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kd->nlehdr.e_ident[EI_CLASS] != ELFCLASS64)
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return (0);
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if (kd->nlehdr.e_machine != EM_MIPS)
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return (0);
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return (_kvm_is_minidump(kd));
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}
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static void
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_mips_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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_mips_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 (kd->nlehdr.e_ident[EI_CLASS] == ELFCLASS64 ||
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kd->nlehdr.e_flags & EF_MIPS_ABI2)
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vmst->pte_size = 64;
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else
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vmst->pte_size = 32;
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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 = _kvm64toh(kd, vmst->hdr.kernbase);
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vmst->hdr.dmapbase = _kvm64toh(kd, vmst->hdr.dmapbase);
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vmst->hdr.dmapend = _kvm64toh(kd, vmst->hdr.dmapend);
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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 = MIPS_PAGE_SIZE + mips_round_page(vmst->hdr.msgbufsize);
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/* Skip dump_avail */
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off = dump_avail_off + mips_round_page(vmst->hdr.dumpavailsize);
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sparse_off = off + mips_round_page(vmst->hdr.bitmapsize) +
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mips_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, MIPS_PAGE_SIZE) == -1) {
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return (-1);
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}
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off += mips_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 += mips_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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_mips_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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mips_physaddr_t offset, a;
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kvaddr_t pteindex;
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u_long valid;
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off_t ofs;
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mips32_pte_t pte32;
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mips64_pte_t pte64;
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "_mips_minidump_kvatop called in live kernel!");
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return (0);
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}
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offset = va & MIPS_PAGE_MASK;
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/* Operate with page-aligned address */
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va &= ~MIPS_PAGE_MASK;
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vm = kd->vmst;
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if (kd->nlehdr.e_ident[EI_CLASS] == ELFCLASS64) {
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if (va >= MIPS_XKPHYS_START && va < MIPS_XKPHYS_END) {
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a = va & MIPS_XKPHYS_PHYS_MASK;
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goto found;
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}
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if (va >= MIPS64_KSEG0_START && va < MIPS64_KSEG0_END) {
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a = va & MIPS_KSEG0_PHYS_MASK;
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goto found;
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}
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if (va >= MIPS64_KSEG1_START && va < MIPS64_KSEG1_END) {
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a = va & MIPS_KSEG0_PHYS_MASK;
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goto found;
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}
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} else {
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if (va >= MIPS32_KSEG0_START && va < MIPS32_KSEG0_END) {
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a = va & MIPS_KSEG0_PHYS_MASK;
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goto found;
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}
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if (va >= MIPS32_KSEG1_START && va < MIPS32_KSEG1_END) {
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a = va & MIPS_KSEG0_PHYS_MASK;
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goto found;
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}
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}
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if (va >= vm->hdr.kernbase) {
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pteindex = (va - vm->hdr.kernbase) >> MIPS_PAGE_SHIFT;
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if (vm->pte_size == 64) {
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valid = pteindex < vm->hdr.ptesize / sizeof(pte64);
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if (pteindex >= vm->hdr.ptesize / sizeof(pte64))
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goto invalid;
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pte64 = _mips64_pte_get(kd, pteindex);
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valid = pte64 & MIPS_PTE_V;
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if (valid)
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a = MIPS64_PTE_TO_PA(pte64);
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} else {
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if (pteindex >= vm->hdr.ptesize / sizeof(pte32))
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goto invalid;
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pte32 = _mips32_pte_get(kd, pteindex);
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valid = pte32 & MIPS_PTE_V;
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if (valid)
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a = MIPS32_PTE_TO_PA(pte32);
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}
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if (!valid) {
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_kvm_err(kd, kd->program, "_mips_minidump_kvatop: pte "
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"not valid");
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goto invalid;
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}
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} else {
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_kvm_err(kd, kd->program, "_mips_minidump_kvatop: virtual "
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"address 0x%jx not minidumped", (uintmax_t)va);
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return (0);
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}
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found:
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ofs = _kvm_pt_find(kd, a, MIPS_PAGE_SIZE);
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if (ofs == -1) {
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_kvm_err(kd, kd->program, "_mips_minidump_kvatop: physical "
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"address 0x%jx not in minidump", (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 (MIPS_PAGE_SIZE - offset);
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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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#ifdef __mips__
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_mips_native(kvm_t *kd)
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#else
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_mips_native(kvm_t *kd __unused)
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#endif
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{
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#ifdef __mips__
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#ifdef __mips_n64
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if (kd->nlehdr.e_ident[EI_CLASS] != ELFCLASS64)
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return (0);
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#else
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if (kd->nlehdr.e_ident[EI_CLASS] != ELFCLASS32)
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return (0);
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#ifdef __mips_n32
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if (!(kd->nlehdr.e_flags & EF_MIPS_ABI2))
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return (0);
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#else
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if (kd->nlehdr.e_flags & EF_MIPS_ABI2)
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return (0);
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#endif
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#endif
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB);
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#else
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return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB);
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#endif
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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 mips_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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_mips_iterator_init(struct mips_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->pte_size == 64)
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it->nptes = vm->hdr.ptesize / sizeof(mips64_pte_t);
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else
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it->nptes = vm->hdr.ptesize / sizeof(mips32_pte_t);
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return;
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}
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static int
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_mips_iterator_next(struct mips_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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int found = 0;
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mips64_pte_t pte64;
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mips32_pte_t pte32;
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/*
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* mips/mips/pmap.c: init_pte_prot / pmap_protect indicate that all
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* pages are R|X at least.
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*/
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*prot = VM_PROT_READ | VM_PROT_EXECUTE;
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*pa = 0;
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*va = 0;
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*dva = 0;
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for (;it->pteindex < it->nptes && found == 0; it->pteindex++) {
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if (vm->pte_size == 64) {
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pte64 = _mips64_pte_get(it->kd, it->pteindex);
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if ((pte64 & MIPS_PTE_V) == 0)
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continue;
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if ((pte64 & MIPS64_PTE_RO) == 0)
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*prot |= VM_PROT_WRITE;
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*pa = MIPS64_PTE_TO_PA(pte64);
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} else {
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pte32 = _mips32_pte_get(it->kd, it->pteindex);
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if ((pte32 & MIPS_PTE_V) == 0)
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continue;
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if ((pte32 & MIPS32_PTE_RO) == 0)
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*prot |= VM_PROT_WRITE;
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*pa = MIPS32_PTE_TO_PA(pte32);
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}
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*va = vm->hdr.kernbase + (it->pteindex << MIPS_PAGE_SHIFT);
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found = 1;
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/* advance pteindex regardless */
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}
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return found;
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}
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static int
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_mips_minidump_walk_pages(kvm_t *kd, kvm_walk_pages_cb_t *cb, void *arg)
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{
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struct mips_iter it;
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u_long dva, pa, va;
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vm_prot_t prot;
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/* Generate direct mapped entries; need page entries for prot etc? */
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if (kd->nlehdr.e_ident[EI_CLASS] == ELFCLASS64) {
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/* MIPS_XKPHYS_START..MIPS_XKPHYS_END */
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/* MIPS64_KSEG0_START..MIPS64_KSEG0_END */
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/* MIPS64_KSEG1_START..MIPS64_KSEG1_START */
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} else {
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/* MIPS32_KSEG0_START..MIPS32_KSEG0_END */
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/* MIPS32_KSEG1_START..MIPS32_KSEG1_END */
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}
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_mips_iterator_init(&it, kd);
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while (_mips_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, MIPS_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_mips_minidump = {
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.ka_probe = _mips_minidump_probe,
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.ka_initvtop = _mips_minidump_initvtop,
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.ka_freevtop = _mips_minidump_freevtop,
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.ka_kvatop = _mips_minidump_kvatop,
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.ka_native = _mips_native,
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.ka_walk_pages = _mips_minidump_walk_pages,
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};
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KVM_ARCH(kvm_mips_minidump);
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