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5f67450d3a
as a macro, and use it instead of literal strings.
622 lines
15 KiB
C
622 lines
15 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.c 8.2 (Berkeley) 2/13/94";
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <sys/param.h>
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#define _WANT_VNET
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#include <sys/user.h>
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#include <sys/proc.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <sys/linker.h>
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#include <sys/pcpu.h>
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#include <net/vnet.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <machine/vmparam.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <limits.h>
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#include <nlist.h>
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#include <paths.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <unistd.h>
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#include "kvm_private.h"
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/* from src/lib/libc/gen/nlist.c */
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int __fdnlist(int, struct nlist *);
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char *
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kvm_geterr(kd)
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kvm_t *kd;
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{
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return (kd->errbuf);
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}
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#include <stdarg.h>
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/*
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* Report an error using printf style arguments. "program" is kd->program
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* on hard errors, and 0 on soft errors, so that under sun error emulation,
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* only hard errors are printed out (otherwise, programs like gdb will
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* generate tons of error messages when trying to access bogus pointers).
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*/
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void
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_kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (program != NULL) {
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(void)fprintf(stderr, "%s: ", program);
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(void)vfprintf(stderr, fmt, ap);
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(void)fputc('\n', stderr);
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} else
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(void)vsnprintf(kd->errbuf,
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sizeof(kd->errbuf), (char *)fmt, ap);
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va_end(ap);
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}
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void
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_kvm_syserr(kvm_t *kd, const char *program, const char *fmt, ...)
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{
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va_list ap;
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int n;
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va_start(ap, fmt);
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if (program != NULL) {
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(void)fprintf(stderr, "%s: ", program);
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(void)vfprintf(stderr, fmt, ap);
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(void)fprintf(stderr, ": %s\n", strerror(errno));
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} else {
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char *cp = kd->errbuf;
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(void)vsnprintf(cp, sizeof(kd->errbuf), (char *)fmt, ap);
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n = strlen(cp);
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(void)snprintf(&cp[n], sizeof(kd->errbuf) - n, ": %s",
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strerror(errno));
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}
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va_end(ap);
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}
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void *
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_kvm_malloc(kd, n)
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kvm_t *kd;
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size_t n;
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{
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void *p;
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if ((p = calloc(n, sizeof(char))) == NULL)
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_kvm_err(kd, kd->program, "can't allocate %u bytes: %s",
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n, strerror(errno));
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return (p);
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}
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static kvm_t *
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_kvm_open(kd, uf, mf, flag, errout)
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kvm_t *kd;
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const char *uf;
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const char *mf;
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int flag;
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char *errout;
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{
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struct stat st;
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kd->vmfd = -1;
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kd->pmfd = -1;
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kd->nlfd = -1;
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kd->vmst = 0;
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kd->procbase = 0;
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kd->argspc = 0;
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kd->argv = 0;
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if (uf == 0)
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uf = getbootfile();
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else if (strlen(uf) >= MAXPATHLEN) {
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_kvm_err(kd, kd->program, "exec file name too long");
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goto failed;
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}
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if (flag & ~O_RDWR) {
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_kvm_err(kd, kd->program, "bad flags arg");
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goto failed;
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}
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if (mf == 0)
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mf = _PATH_MEM;
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if ((kd->pmfd = open(mf, flag, 0)) < 0) {
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_kvm_syserr(kd, kd->program, "%s", mf);
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goto failed;
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}
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if (fstat(kd->pmfd, &st) < 0) {
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_kvm_syserr(kd, kd->program, "%s", mf);
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goto failed;
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}
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if (S_ISREG(st.st_mode) && st.st_size <= 0) {
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errno = EINVAL;
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_kvm_syserr(kd, kd->program, "empty file");
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goto failed;
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}
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if (fcntl(kd->pmfd, F_SETFD, FD_CLOEXEC) < 0) {
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_kvm_syserr(kd, kd->program, "%s", mf);
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goto failed;
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}
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if (S_ISCHR(st.st_mode)) {
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/*
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* If this is a character special device, then check that
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* it's /dev/mem. If so, open kmem too. (Maybe we should
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* make it work for either /dev/mem or /dev/kmem -- in either
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* case you're working with a live kernel.)
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*/
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if (strcmp(mf, _PATH_DEVNULL) == 0) {
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kd->vmfd = open(_PATH_DEVNULL, O_RDONLY);
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return (kd);
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} else if (strcmp(mf, _PATH_MEM) == 0) {
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if ((kd->vmfd = open(_PATH_KMEM, flag)) < 0) {
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_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
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goto failed;
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}
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if (fcntl(kd->vmfd, F_SETFD, FD_CLOEXEC) < 0) {
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_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
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goto failed;
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}
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return (kd);
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}
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}
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/*
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* This is a crash dump.
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* Initialize the virtual address translation machinery,
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* but first setup the namelist fd.
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*/
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if ((kd->nlfd = open(uf, O_RDONLY, 0)) < 0) {
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_kvm_syserr(kd, kd->program, "%s", uf);
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goto failed;
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}
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if (fcntl(kd->nlfd, F_SETFD, FD_CLOEXEC) < 0) {
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_kvm_syserr(kd, kd->program, "%s", uf);
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goto failed;
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}
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if (strncmp(mf, _PATH_FWMEM, strlen(_PATH_FWMEM)) == 0)
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kd->rawdump = 1;
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if (_kvm_initvtop(kd) < 0)
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goto failed;
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return (kd);
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failed:
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/*
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* Copy out the error if doing sane error semantics.
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*/
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if (errout != 0)
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strlcpy(errout, kd->errbuf, _POSIX2_LINE_MAX);
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(void)kvm_close(kd);
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return (0);
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}
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kvm_t *
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kvm_openfiles(uf, mf, sf, flag, errout)
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const char *uf;
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const char *mf;
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const char *sf __unused;
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int flag;
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char *errout;
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{
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kvm_t *kd;
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if ((kd = calloc(1, sizeof(*kd))) == NULL) {
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(void)strlcpy(errout, strerror(errno), _POSIX2_LINE_MAX);
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return (0);
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}
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kd->program = 0;
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return (_kvm_open(kd, uf, mf, flag, errout));
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}
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kvm_t *
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kvm_open(uf, mf, sf, flag, errstr)
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const char *uf;
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const char *mf;
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const char *sf __unused;
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int flag;
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const char *errstr;
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{
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kvm_t *kd;
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if ((kd = calloc(1, sizeof(*kd))) == NULL) {
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if (errstr != NULL)
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(void)fprintf(stderr, "%s: %s\n",
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errstr, strerror(errno));
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return (0);
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}
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kd->program = errstr;
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return (_kvm_open(kd, uf, mf, flag, NULL));
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}
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int
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kvm_close(kd)
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kvm_t *kd;
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{
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int error = 0;
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if (kd->pmfd >= 0)
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error |= close(kd->pmfd);
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if (kd->vmfd >= 0)
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error |= close(kd->vmfd);
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if (kd->nlfd >= 0)
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error |= close(kd->nlfd);
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if (kd->vmst)
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_kvm_freevtop(kd);
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if (kd->procbase != 0)
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free((void *)kd->procbase);
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if (kd->argbuf != 0)
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free((void *) kd->argbuf);
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if (kd->argspc != 0)
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free((void *) kd->argspc);
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if (kd->argv != 0)
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free((void *)kd->argv);
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free((void *)kd);
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return (0);
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}
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/*
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* Walk the list of unresolved symbols, generate a new list and prefix the
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* symbol names, try again, and merge back what we could resolve.
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*/
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static int
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kvm_fdnlist_prefix(kvm_t *kd, struct nlist *nl, int missing, const char *prefix,
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uintptr_t (*validate_fn)(kvm_t *, uintptr_t))
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{
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struct nlist *n, *np, *p;
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char *cp, *ce;
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size_t len;
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int unresolved;
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/*
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* Calculate the space we need to malloc for nlist and names.
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* We are going to store the name twice for later lookups: once
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* with the prefix and once the unmodified name delmited by \0.
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*/
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len = 0;
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unresolved = 0;
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for (p = nl; p->n_name && p->n_name[0]; ++p) {
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if (p->n_type != N_UNDF)
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continue;
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len += sizeof(struct nlist) + strlen(prefix) +
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2 * (strlen(p->n_name) + 1);
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unresolved++;
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}
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if (unresolved == 0)
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return (unresolved);
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/* Add space for the terminating nlist entry. */
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len += sizeof(struct nlist);
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unresolved++;
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/* Alloc one chunk for (nlist, [names]) and setup pointers. */
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n = np = malloc(len);
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bzero(n, len);
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if (n == NULL)
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return (missing);
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cp = ce = (char *)np;
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cp += unresolved * sizeof(struct nlist);
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ce += len;
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/* Generate shortened nlist with special prefix. */
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unresolved = 0;
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for (p = nl; p->n_name && p->n_name[0]; ++p) {
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if (p->n_type != N_UNDF)
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continue;
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bcopy(p, np, sizeof(struct nlist));
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/* Save the new\0orig. name so we can later match it again. */
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len = snprintf(cp, ce - cp, "%s%s%c%s", prefix,
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(prefix[0] != '\0' && p->n_name[0] == '_') ?
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(p->n_name + 1) : p->n_name, '\0', p->n_name);
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if (len >= ce - cp)
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continue;
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np->n_name = cp;
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cp += len + 1;
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np++;
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unresolved++;
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}
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/* Do lookup on the reduced list. */
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np = n;
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unresolved = __fdnlist(kd->nlfd, np);
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/* Check if we could resolve further symbols and update the list. */
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if (unresolved >= 0 && unresolved < missing) {
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/* Find the first freshly resolved entry. */
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for (; np->n_name && np->n_name[0]; np++)
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if (np->n_type != N_UNDF)
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break;
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/*
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* The lists are both in the same order,
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* so we can walk them in parallel.
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*/
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for (p = nl; np->n_name && np->n_name[0] &&
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p->n_name && p->n_name[0]; ++p) {
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if (p->n_type != N_UNDF)
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continue;
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/* Skip expanded name and compare to orig. one. */
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cp = np->n_name + strlen(np->n_name) + 1;
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if (strcmp(cp, p->n_name))
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continue;
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/* Update nlist with new, translated results. */
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p->n_type = np->n_type;
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p->n_other = np->n_other;
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p->n_desc = np->n_desc;
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if (validate_fn)
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p->n_value = (*validate_fn)(kd, np->n_value);
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else
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p->n_value = np->n_value;
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missing--;
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/* Find next freshly resolved entry. */
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for (np++; np->n_name && np->n_name[0]; np++)
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if (np->n_type != N_UNDF)
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break;
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}
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}
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/* We could assert missing = unresolved here. */
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free(n);
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return (unresolved);
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}
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int
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_kvm_nlist(kvm_t *kd, struct nlist *nl, int initialize)
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{
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struct nlist *p;
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int nvalid;
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struct kld_sym_lookup lookup;
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int error;
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char *prefix = "", symname[1024]; /* XXX-BZ symbol name length limit? */
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int tried_vnet, tried_dpcpu;
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/*
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* If we can't use the kld symbol lookup, revert to the
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* slow library call.
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*/
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if (!ISALIVE(kd)) {
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error = __fdnlist(kd->nlfd, nl);
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if (error <= 0) /* Hard error or success. */
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return (error);
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if (_kvm_vnet_initialized(kd, initialize))
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error = kvm_fdnlist_prefix(kd, nl, error,
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VNET_SYMPREFIX, _kvm_vnet_validaddr);
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if (error > 0 && _kvm_dpcpu_initialized(kd, initialize))
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error = kvm_fdnlist_prefix(kd, nl, error,
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DPCPU_SYMPREFIX, _kvm_dpcpu_validaddr);
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return (error);
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}
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/*
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* We can use the kld lookup syscall. Go through each nlist entry
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* and look it up with a kldsym(2) syscall.
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*/
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nvalid = 0;
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tried_vnet = 0;
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tried_dpcpu = 0;
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again:
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for (p = nl; p->n_name && p->n_name[0]; ++p) {
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if (p->n_type != N_UNDF)
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continue;
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lookup.version = sizeof(lookup);
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lookup.symvalue = 0;
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lookup.symsize = 0;
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error = snprintf(symname, sizeof(symname), "%s%s", prefix,
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(prefix[0] != '\0' && p->n_name[0] == '_') ?
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(p->n_name + 1) : p->n_name);
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if (error >= sizeof(symname))
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continue;
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lookup.symname = symname;
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if (lookup.symname[0] == '_')
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lookup.symname++;
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if (kldsym(0, KLDSYM_LOOKUP, &lookup) != -1) {
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p->n_type = N_TEXT;
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p->n_other = 0;
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p->n_desc = 0;
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if (_kvm_vnet_initialized(kd, initialize) &&
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!strcmp(prefix, VNET_SYMPREFIX))
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p->n_value =
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_kvm_vnet_validaddr(kd, lookup.symvalue);
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else if (_kvm_dpcpu_initialized(kd, initialize) &&
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!strcmp(prefix, DPCPU_SYMPREFIX))
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p->n_value =
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_kvm_dpcpu_validaddr(kd, lookup.symvalue);
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else
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p->n_value = lookup.symvalue;
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++nvalid;
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/* lookup.symsize */
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}
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}
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/*
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* Check the number of entries that weren't found. If they exist,
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* try again with a prefix for virtualized or DPCPU symbol names.
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*/
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error = ((p - nl) - nvalid);
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if (error && _kvm_vnet_initialized(kd, initialize) && !tried_vnet) {
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tried_vnet = 1;
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prefix = VNET_SYMPREFIX;
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goto again;
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}
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if (error && _kvm_dpcpu_initialized(kd, initialize) && !tried_dpcpu) {
|
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tried_dpcpu = 1;
|
|
prefix = DPCPU_SYMPREFIX;
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* Return the number of entries that weren't found. If they exist,
|
|
* also fill internal error buffer.
|
|
*/
|
|
error = ((p - nl) - nvalid);
|
|
if (error)
|
|
_kvm_syserr(kd, kd->program, "kvm_nlist");
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kvm_nlist(kd, nl)
|
|
kvm_t *kd;
|
|
struct nlist *nl;
|
|
{
|
|
|
|
/*
|
|
* If called via the public interface, permit intialization of
|
|
* further virtualized modules on demand.
|
|
*/
|
|
return (_kvm_nlist(kd, nl, 1));
|
|
}
|
|
|
|
ssize_t
|
|
kvm_read(kd, kva, buf, len)
|
|
kvm_t *kd;
|
|
u_long kva;
|
|
void *buf;
|
|
size_t len;
|
|
{
|
|
int cc;
|
|
char *cp;
|
|
|
|
if (ISALIVE(kd)) {
|
|
/*
|
|
* We're using /dev/kmem. Just read straight from the
|
|
* device and let the active kernel do the address translation.
|
|
*/
|
|
errno = 0;
|
|
if (lseek(kd->vmfd, (off_t)kva, 0) == -1 && errno != 0) {
|
|
_kvm_err(kd, 0, "invalid address (%x)", kva);
|
|
return (-1);
|
|
}
|
|
cc = read(kd->vmfd, buf, len);
|
|
if (cc < 0) {
|
|
_kvm_syserr(kd, 0, "kvm_read");
|
|
return (-1);
|
|
} else if (cc < len)
|
|
_kvm_err(kd, kd->program, "short read");
|
|
return (cc);
|
|
} else {
|
|
cp = buf;
|
|
while (len > 0) {
|
|
off_t pa;
|
|
|
|
cc = _kvm_kvatop(kd, kva, &pa);
|
|
if (cc == 0)
|
|
return (-1);
|
|
if (cc > len)
|
|
cc = len;
|
|
errno = 0;
|
|
if (lseek(kd->pmfd, pa, 0) == -1 && errno != 0) {
|
|
_kvm_syserr(kd, 0, _PATH_MEM);
|
|
break;
|
|
}
|
|
cc = read(kd->pmfd, cp, cc);
|
|
if (cc < 0) {
|
|
_kvm_syserr(kd, kd->program, "kvm_read");
|
|
break;
|
|
}
|
|
/*
|
|
* If kvm_kvatop returns a bogus value or our core
|
|
* file is truncated, we might wind up seeking beyond
|
|
* the end of the core file in which case the read will
|
|
* return 0 (EOF).
|
|
*/
|
|
if (cc == 0)
|
|
break;
|
|
cp += cc;
|
|
kva += cc;
|
|
len -= cc;
|
|
}
|
|
return (cp - (char *)buf);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
ssize_t
|
|
kvm_write(kd, kva, buf, len)
|
|
kvm_t *kd;
|
|
u_long kva;
|
|
const void *buf;
|
|
size_t len;
|
|
{
|
|
int cc;
|
|
|
|
if (ISALIVE(kd)) {
|
|
/*
|
|
* Just like kvm_read, only we write.
|
|
*/
|
|
errno = 0;
|
|
if (lseek(kd->vmfd, (off_t)kva, 0) == -1 && errno != 0) {
|
|
_kvm_err(kd, 0, "invalid address (%x)", kva);
|
|
return (-1);
|
|
}
|
|
cc = write(kd->vmfd, buf, len);
|
|
if (cc < 0) {
|
|
_kvm_syserr(kd, 0, "kvm_write");
|
|
return (-1);
|
|
} else if (cc < len)
|
|
_kvm_err(kd, kd->program, "short write");
|
|
return (cc);
|
|
} else {
|
|
_kvm_err(kd, kd->program,
|
|
"kvm_write not implemented for dead kernels");
|
|
return (-1);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|