add112ff65
readable on certain random memory configurations. If the libkvm consumer tried to read something that was in the very last pdpe, pde or pte slot, it would bogusly fail. This is broken in RELENG_6 too.
438 lines
11 KiB
C
438 lines
11 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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/user.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <machine/elf.h>
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#include <limits.h>
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#include "kvm_private.h"
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#ifndef btop
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#define btop(x) (i386_btop(x))
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#define ptob(x) (i386_ptob(x))
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#endif
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#define PG_FRAME_PAE (~((uint64_t)PAGE_MASK))
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#define PDRSHIFT_PAE 21
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#define NPTEPG_PAE (PAGE_SIZE/sizeof(uint64_t))
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#define NBPDR_PAE (1<<PDRSHIFT_PAE)
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struct vmstate {
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void *mmapbase;
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size_t mmapsize;
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void *PTD;
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int pae;
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};
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/*
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* Map the ELF headers into the process' address space. We do this in two
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* steps: first the ELF header itself and using that information the whole
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* set of headers. (Taken from kvm_ia64.c)
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*/
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static int
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_kvm_maphdrs(kvm_t *kd, size_t sz)
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{
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struct vmstate *vm = kd->vmst;
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/* munmap() previous mmap(). */
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if (vm->mmapbase != NULL) {
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munmap(vm->mmapbase, vm->mmapsize);
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vm->mmapbase = NULL;
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}
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vm->mmapsize = sz;
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vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
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if (vm->mmapbase == MAP_FAILED) {
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_kvm_err(kd, kd->program, "cannot mmap corefile");
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return (-1);
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}
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return (0);
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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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* (Taken from kvm_ia64.c)
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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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Elf_Ehdr *e = kd->vmst->mmapbase;
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Elf_Phdr *p = (Elf_Phdr*)((char*)e + e->e_phoff);
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int n = e->e_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 (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
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}
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void
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_kvm_freevtop(kvm_t *kd)
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{
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struct vmstate *vm = kd->vmst;
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if (vm->mmapbase != NULL)
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munmap(vm->mmapbase, vm->mmapsize);
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if (vm->PTD)
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free(vm->PTD);
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free(vm);
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kd->vmst = NULL;
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}
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int
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_kvm_initvtop(kvm_t *kd)
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{
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struct nlist nlist[2];
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u_long pa;
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u_long kernbase;
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char *PTD;
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Elf_Ehdr *ehdr;
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size_t hdrsz;
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int i;
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kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
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if (kd->vmst == 0) {
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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 (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
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return (-1);
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ehdr = kd->vmst->mmapbase;
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hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
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if (_kvm_maphdrs(kd, hdrsz) == -1)
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return (-1);
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nlist[0].n_name = "kernbase";
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nlist[1].n_name = 0;
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if (kvm_nlist(kd, nlist) != 0)
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kernbase = KERNBASE; /* for old kernels */
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else
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kernbase = nlist[0].n_value;
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nlist[0].n_name = "IdlePDPT";
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nlist[1].n_name = 0;
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if (kvm_nlist(kd, nlist) == 0) {
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uint64_t pa64;
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if (kvm_read(kd, (nlist[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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PTD = _kvm_malloc(kd, 4 * PAGE_SIZE);
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for (i = 0; i < 4; i++) {
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if (kvm_read(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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if (kvm_read(kd, pa64 & PG_FRAME_PAE,
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PTD + (i * PAGE_SIZE), PAGE_SIZE) != (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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nlist[0].n_name = "IdlePTD";
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nlist[1].n_name = 0;
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if (kvm_nlist(kd, nlist) != 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_read(kd, (nlist[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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PTD = _kvm_malloc(kd, PAGE_SIZE);
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if (kvm_read(kd, pa, PTD, PAGE_SIZE) != 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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return (0);
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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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_kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
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{
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struct vmstate *vm;
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u_long offset;
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u_long pte_pa;
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u_long pde_pa;
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pd_entry_t pde;
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pt_entry_t pte;
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u_long pdeindex;
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u_long pteindex;
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size_t s;
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u_long a;
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off_t ofs;
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uint32_t *PTD;
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vm = kd->vmst;
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PTD = (uint32_t *)vm->PTD;
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offset = va & (PAGE_SIZE - 1);
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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 == 0) {
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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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"_kvm_vatop: bootstrap data not in dump");
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goto invalid;
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} else
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return (PAGE_SIZE - offset);
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}
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pdeindex = va >> PDRSHIFT;
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pde = PTD[pdeindex];
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if (((u_long)pde & PG_V) == 0) {
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_kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
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goto invalid;
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}
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if ((u_long)pde & PG_PS) {
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/*
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* No second-level page table; ptd describes one 4MB page.
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* (We assume that the kernel wouldn't set PG_PS without enabling
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* it cr0).
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*/
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#define PAGE4M_MASK (NBPDR - 1)
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#define PG_FRAME4M (~PAGE4M_MASK)
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pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
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s = _kvm_pa2off(kd, pde_pa, &ofs);
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if (s < sizeof pde) {
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_kvm_syserr(kd, kd->program,
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"_kvm_vatop: pde_pa not found");
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goto invalid;
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}
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*pa = ofs;
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return (NBPDR - (va & PAGE4M_MASK));
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}
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pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
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pte_pa = ((u_long)pde & PG_FRAME) + (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, "_kvm_vatop: 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 (lseek(kd->pmfd, ofs, 0) == -1) {
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_kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
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goto invalid;
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}
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if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
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_kvm_syserr(kd, kd->program, "_kvm_vatop: read");
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goto invalid;
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}
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if (((u_long)pte & 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 = ((u_long)pte & 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, "_kvm_vatop: address not in dump");
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goto invalid;
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} else
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return (PAGE_SIZE - offset);
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%lx)", va);
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return (0);
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}
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static int
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_kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
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{
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struct vmstate *vm;
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uint64_t offset;
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uint64_t pte_pa;
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uint64_t pde_pa;
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uint64_t pde;
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uint64_t pte;
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u_long pdeindex;
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u_long pteindex;
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size_t s;
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uint64_t a;
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off_t ofs;
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uint64_t *PTD;
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vm = kd->vmst;
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PTD = (uint64_t *)vm->PTD;
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offset = va & (PAGE_SIZE - 1);
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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 == 0) {
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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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"_kvm_vatop_pae: bootstrap data not in dump");
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goto invalid;
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} else
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return (PAGE_SIZE - offset);
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}
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pdeindex = va >> PDRSHIFT_PAE;
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pde = PTD[pdeindex];
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if (((u_long)pde & 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 ((u_long)pde & PG_PS) {
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/*
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* No second-level page table; ptd describes one 2MB page.
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* (We assume that the kernel wouldn't set PG_PS without enabling
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* it cr0).
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*/
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#define PAGE2M_MASK (NBPDR_PAE - 1)
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#define PG_FRAME2M (~PAGE2M_MASK)
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pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
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s = _kvm_pa2off(kd, pde_pa, &ofs);
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if (s < sizeof pde) {
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_kvm_syserr(kd, kd->program,
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"_kvm_vatop_pae: pde_pa not found");
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goto invalid;
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}
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*pa = ofs;
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return (NBPDR_PAE - (va & PAGE2M_MASK));
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}
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pteindex = (va >> PAGE_SHIFT) & (NPTEPG_PAE-1);
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pte_pa = ((uint64_t)pde & 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, "_kvm_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 (lseek(kd->pmfd, ofs, 0) == -1) {
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_kvm_syserr(kd, kd->program, "_kvm_vatop_pae: lseek");
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goto invalid;
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}
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if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
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_kvm_syserr(kd, kd->program, "_kvm_vatop_pae: read");
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goto invalid;
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}
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if (((uint64_t)pte & PG_V) == 0) {
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_kvm_err(kd, kd->program, "_kvm_vatop_pae: pte not valid");
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goto invalid;
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}
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a = ((uint64_t)pte & 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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"_kvm_vatop_pae: address not in dump");
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goto invalid;
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} else
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return (PAGE_SIZE - offset);
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invalid:
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_kvm_err(kd, 0, "invalid address (0x%lx)", va);
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return (0);
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}
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int
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_kvm_kvatop(kvm_t *kd, u_long 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 (_kvm_vatop_pae(kd, va, pa));
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else
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return (_kvm_vatop(kd, va, pa));
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}
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