a9f56210b8
In particular, - avoid dereferencing NULL pointers - test pointers against NULL, not 0 - test for errout == NULL in the top-level functions (kvm_open, kvm_openfiles, kvm_open2, etc) - Replace a realloc and free on failure with reallocf Found with: devel/cocchinelle Differential Revision: https://reviews.freebsd.org/D5954 MFC after: 1 week Reviewed by: jhb Sponsored by: EMC / Isilon Storage Division
431 lines
10 KiB
C
431 lines
10 KiB
C
/*-
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* Copyright (c) 1989, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software developed by the Computer Systems
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* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
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* BG 91-66 and contributed to Berkeley.
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* i386 machine dependent routines for kvm. Hopefully, the forthcoming
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* vm code will one day obsolete this module.
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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 <kvm.h>
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#ifdef __i386__
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#include <machine/vmparam.h> /* For KERNBASE. */
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#endif
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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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struct vmstate {
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void *PTD;
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int pae;
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size_t phnum;
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GElf_Phdr *phdr;
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};
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/*
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* Translate a physical memory address to a file-offset in the crash-dump.
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*/
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static size_t
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_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
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{
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struct vmstate *vm = kd->vmst;
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GElf_Phdr *p;
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size_t n;
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if (kd->rawdump) {
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*ofs = pa;
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return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
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}
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p = vm->phdr;
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n = vm->phnum;
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while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
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p++, n--;
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if (n == 0)
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return (0);
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*ofs = (pa - p->p_paddr) + p->p_offset;
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return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
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}
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static void
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_i386_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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if (vm->PTD)
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free(vm->PTD);
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free(vm->phdr);
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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_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 int
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_i386_initvtop(kvm_t *kd)
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{
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struct kvm_nlist nl[2];
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i386_physaddr_t pa;
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kvaddr_t kernbase;
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char *PTD;
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int i;
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kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate));
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if (kd->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->PTD = 0;
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if (kd->rawdump == 0) {
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if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum,
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&kd->vmst->phdr) == -1)
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return (-1);
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}
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nl[0].n_name = "kernbase";
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nl[1].n_name = 0;
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if (kvm_nlist2(kd, nl) != 0) {
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#ifdef __i386__
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kernbase = KERNBASE; /* for old kernels */
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#else
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_kvm_err(kd, kd->program, "cannot resolve kernbase");
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return (-1);
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#endif
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} else
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kernbase = nl[0].n_value;
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nl[0].n_name = "IdlePDPT";
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nl[1].n_name = 0;
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if (kvm_nlist2(kd, nl) == 0) {
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i386_physaddr_pae_t pa64;
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if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
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sizeof(pa)) != sizeof(pa)) {
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_kvm_err(kd, kd->program, "cannot read IdlePDPT");
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return (-1);
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}
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pa = le32toh(pa);
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PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE);
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if (PTD == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate PTD");
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return (-1);
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}
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for (i = 0; i < 4; i++) {
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if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64,
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sizeof(pa64)) != sizeof(pa64)) {
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_kvm_err(kd, kd->program, "Cannot read PDPT");
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free(PTD);
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return (-1);
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}
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pa64 = le64toh(pa64);
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if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE,
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PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) !=
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I386_PAGE_SIZE) {
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_kvm_err(kd, kd->program, "cannot read PDPT");
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free(PTD);
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return (-1);
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}
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}
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kd->vmst->PTD = PTD;
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kd->vmst->pae = 1;
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} else {
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nl[0].n_name = "IdlePTD";
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nl[1].n_name = 0;
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if (kvm_nlist2(kd, nl) != 0) {
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_kvm_err(kd, kd->program, "bad namelist");
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return (-1);
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}
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if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
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sizeof(pa)) != sizeof(pa)) {
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_kvm_err(kd, kd->program, "cannot read IdlePTD");
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return (-1);
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}
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pa = le32toh(pa);
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PTD = _kvm_malloc(kd, I386_PAGE_SIZE);
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if (PTD == NULL) {
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_kvm_err(kd, kd->program, "cannot allocate PTD");
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return (-1);
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}
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if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) {
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_kvm_err(kd, kd->program, "cannot read PTD");
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return (-1);
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}
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kd->vmst->PTD = PTD;
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kd->vmst->pae = 0;
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}
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return (0);
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}
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static int
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_i386_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_physaddr_t pte_pa;
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i386_pde_t pde;
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i386_pte_t pte;
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kvaddr_t pdeindex;
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kvaddr_t pteindex;
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size_t s;
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i386_physaddr_t a;
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off_t ofs;
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i386_pde_t *PTD;
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vm = kd->vmst;
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PTD = (i386_pde_t *)vm->PTD;
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offset = va & I386_PAGE_MASK;
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/*
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* If we are initializing (kernel page table descriptor pointer
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* not yet set) then return pa == va to avoid infinite recursion.
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*/
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if (PTD == NULL) {
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s = _kvm_pa2off(kd, va, pa);
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if (s == 0) {
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_kvm_err(kd, kd->program,
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"_i386_vatop: bootstrap data not in dump");
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goto invalid;
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} else
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return (I386_PAGE_SIZE - offset);
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}
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pdeindex = va >> I386_PDRSHIFT;
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pde = le32toh(PTD[pdeindex]);
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if ((pde & I386_PG_V) == 0) {
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_kvm_err(kd, kd->program, "_i386_vatop: pde not valid");
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goto invalid;
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}
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if (pde & I386_PG_PS) {
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/*
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* No second-level page table; ptd describes one 4MB
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* page. (We assume that the kernel wouldn't set
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* PG_PS without enabling it cr0).
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*/
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offset = va & I386_PAGE_PS_MASK;
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a = (pde & I386_PG_PS_FRAME) + offset;
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s = _kvm_pa2off(kd, a, pa);
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if (s == 0) {
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_kvm_err(kd, kd->program,
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"_i386_vatop: 4MB page address not in dump");
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goto invalid;
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}
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return (I386_NBPDR - offset);
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}
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pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1);
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pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte));
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s = _kvm_pa2off(kd, pte_pa, &ofs);
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if (s < sizeof(pte)) {
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_kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found");
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goto invalid;
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}
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/* XXX This has to be a physical address read, kvm_read is virtual */
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if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
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_kvm_syserr(kd, kd->program, "_i386_vatop: pread");
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goto invalid;
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}
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pte = le32toh(pte);
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if ((pte & I386_PG_V) == 0) {
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_kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
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goto invalid;
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}
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a = (pte & I386_PG_FRAME) + offset;
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s = _kvm_pa2off(kd, a, pa);
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if (s == 0) {
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_kvm_err(kd, kd->program, "_i386_vatop: address not in dump");
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goto invalid;
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} else
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return (I386_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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_i386_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_physaddr_pae_t pte_pa;
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i386_pde_pae_t pde;
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i386_pte_pae_t pte;
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kvaddr_t pdeindex;
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kvaddr_t pteindex;
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size_t s;
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i386_physaddr_pae_t a;
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off_t ofs;
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i386_pde_pae_t *PTD;
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vm = kd->vmst;
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PTD = (i386_pde_pae_t *)vm->PTD;
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offset = va & I386_PAGE_MASK;
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/*
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* If we are initializing (kernel page table descriptor pointer
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* not yet set) then return pa == va to avoid infinite recursion.
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*/
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if (PTD == NULL) {
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s = _kvm_pa2off(kd, va, pa);
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if (s == 0) {
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_kvm_err(kd, kd->program,
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"_i386_vatop_pae: bootstrap data not in dump");
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goto invalid;
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} else
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return (I386_PAGE_SIZE - offset);
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}
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pdeindex = va >> I386_PDRSHIFT_PAE;
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pde = le64toh(PTD[pdeindex]);
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if ((pde & I386_PG_V) == 0) {
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_kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
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goto invalid;
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}
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if (pde & I386_PG_PS) {
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/*
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* No second-level page table; ptd describes one 2MB
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* page. (We assume that the kernel wouldn't set
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* PG_PS without enabling it cr0).
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*/
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offset = va & I386_PAGE_PS_MASK_PAE;
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a = (pde & I386_PG_PS_FRAME_PAE) + offset;
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s = _kvm_pa2off(kd, a, pa);
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if (s == 0) {
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_kvm_err(kd, kd->program,
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"_i386_vatop: 2MB page address not in dump");
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goto invalid;
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}
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return (I386_NBPDR_PAE - offset);
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}
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pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1);
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pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde));
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s = _kvm_pa2off(kd, pte_pa, &ofs);
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if (s < sizeof(pte)) {
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_kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found");
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goto invalid;
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}
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/* XXX This has to be a physical address read, kvm_read is virtual */
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if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
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_kvm_syserr(kd, kd->program, "_i386_vatop_pae: read");
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goto invalid;
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}
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pte = le64toh(pte);
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if ((pte & I386_PG_V) == 0) {
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_kvm_err(kd, kd->program, "_i386_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) + offset;
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s = _kvm_pa2off(kd, a, pa);
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if (s == 0) {
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_kvm_err(kd, kd->program,
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"_i386_vatop_pae: address not in dump");
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goto invalid;
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} else
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return (I386_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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_i386_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, "vatop called in live kernel!");
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return (0);
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}
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if (kd->vmst->pae)
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return (_i386_vatop_pae(kd, va, pa));
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else
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return (_i386_vatop(kd, va, pa));
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}
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int
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_i386_native(kvm_t *kd)
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{
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#ifdef __i386__
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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_i386 = {
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.ka_probe = _i386_probe,
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.ka_initvtop = _i386_initvtop,
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.ka_freevtop = _i386_freevtop,
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.ka_kvatop = _i386_kvatop,
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.ka_native = _i386_native,
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};
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KVM_ARCH(kvm_i386);
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