548 lines
13 KiB
C
548 lines
13 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)kvm.c 8.2 (Berkeley) 2/13/94";
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#endif /* LIBC_SCCS and not lint */
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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/ioctl.h>
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#include <sys/stat.h>
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#include <sys/sysctl.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/swap_pager.h>
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#include <machine/vmparam.h>
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#include <ctype.h>
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#include <db.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 <unistd.h>
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#include "kvm_private.h"
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static int kvm_dbopen __P((kvm_t *, const char *));
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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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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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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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#if __STDC__
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_kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
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#else
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_kvm_err(kd, program, fmt, va_alist)
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kvm_t *kd;
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char *program, *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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#ifdef __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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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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#if __STDC__
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_kvm_syserr(kvm_t *kd, const char *program, const char *fmt, ...)
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#else
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_kvm_syserr(kd, program, fmt, va_alist)
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kvm_t *kd;
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char *program, *fmt;
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va_dcl
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#endif
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{
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va_list ap;
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register int n;
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#if __STDC__
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va_start(ap, fmt);
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#else
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va_start(ap);
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#endif
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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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register 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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register kvm_t *kd;
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register size_t n;
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{
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void *p;
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if ((p = malloc(n)) == NULL)
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_kvm_err(kd, kd->program, 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, sf, flag, errout)
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register kvm_t *kd;
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const char *uf;
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const char *mf;
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const char *sf;
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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->db = 0;
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kd->pmfd = -1;
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kd->vmfd = -1;
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kd->swfd = -1;
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kd->nlfd = -1;
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kd->procbase = 0;
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kd->nbpg = getpagesize();
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kd->swapspc = 0;
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kd->argspc = 0;
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kd->argv = 0;
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kd->vmst = 0;
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kd->vm_page_buckets = 0;
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if (uf == 0)
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uf = _PATH_UNIX;
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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 (sf == 0)
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sf = _PATH_DRUM;
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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_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_MEM) != 0) { /* XXX */
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_kvm_err(kd, kd->program,
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"%s: not physical memory device", mf);
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goto failed;
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}
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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 ((kd->swfd = open(sf, flag, 0)) < 0) {
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_kvm_syserr(kd, kd->program, "%s", sf);
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goto failed;
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}
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/*
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* Open kvm nlist database. We go ahead and do this
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* here so that we don't have to hold on to the vmunix
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* path name. Since a kvm application will surely do
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* a kvm_nlist(), this probably won't be a wasted effort.
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* If the database cannot be opened, open the namelist
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* argument so we revert to slow nlist() calls.
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*/
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if (kvm_dbopen(kd, uf) < 0 &&
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(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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} else {
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/*
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* This is a crash dump.
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* Initalize 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 (_kvm_initvtop(kd) < 0)
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goto failed;
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}
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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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strcpy(errout, kd->errbuf);
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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;
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int flag;
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char *errout;
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{
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register kvm_t *kd;
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if ((kd = malloc(sizeof(*kd))) == NULL) {
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(void)strcpy(errout, strerror(errno));
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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, sf, flag, errout));
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}
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kvm_t *
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kvm_open(uf, mf, sf, flag, program)
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const char *uf;
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const char *mf;
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const char *sf;
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int flag;
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const char *program;
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{
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register kvm_t *kd;
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if ((kd = malloc(sizeof(*kd))) == NULL && program != NULL) {
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(void)fprintf(stderr, "%s: %s\n", strerror(errno));
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return (0);
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}
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kd->program = program;
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return (_kvm_open(kd, uf, mf, sf, 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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register 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->swfd >= 0)
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error |= close(kd->swfd);
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if (kd->db != 0)
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error |= (kd->db->close)(kd->db);
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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->swapspc != 0)
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free((void *)kd->swapspc);
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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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* Set up state necessary to do queries on the kernel namelist
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* data base. If the data base is out-of-data/incompatible with
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* given executable, set up things so we revert to standard nlist call.
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* Only called for live kernels. Return 0 on success, -1 on failure.
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*/
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static int
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kvm_dbopen(kd, uf)
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kvm_t *kd;
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const char *uf;
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{
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char *cp;
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DBT rec;
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int dbversionlen;
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struct nlist nitem;
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char dbversion[_POSIX2_LINE_MAX];
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char kversion[_POSIX2_LINE_MAX];
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char dbname[MAXPATHLEN];
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if ((cp = rindex(uf, '/')) != 0)
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uf = cp + 1;
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(void)snprintf(dbname, sizeof(dbname), "%skvm_%s.db", _PATH_VARDB, uf);
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kd->db = dbopen(dbname, O_RDONLY, 0, DB_HASH, NULL);
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if (kd->db == 0)
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return (-1);
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/*
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* read version out of database
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*/
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rec.data = VRS_KEY;
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rec.size = sizeof(VRS_KEY) - 1;
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if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0))
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goto close;
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if (rec.data == 0 || rec.size > sizeof(dbversion))
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goto close;
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bcopy(rec.data, dbversion, rec.size);
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dbversionlen = rec.size;
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/*
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* Read version string from kernel memory.
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* Since we are dealing with a live kernel, we can call kvm_read()
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* at this point.
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*/
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rec.data = VRS_SYM;
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rec.size = sizeof(VRS_SYM) - 1;
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if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0))
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goto close;
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if (rec.data == 0 || rec.size != sizeof(struct nlist))
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goto close;
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bcopy((char *)rec.data, (char *)&nitem, sizeof(nitem));
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if (kvm_read(kd, (u_long)nitem.n_value, kversion, dbversionlen) !=
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dbversionlen)
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goto close;
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/*
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* If they match, we win - otherwise clear out kd->db so
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* we revert to slow nlist().
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*/
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if (bcmp(dbversion, kversion, dbversionlen) == 0)
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return (0);
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close:
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(void)(kd->db->close)(kd->db);
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kd->db = 0;
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return (-1);
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}
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int
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kvm_nlist(kd, nl)
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kvm_t *kd;
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struct nlist *nl;
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{
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register struct nlist *p;
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register int nvalid;
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/*
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* If we can't use the data base, revert to the
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* slow library call.
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*/
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if (kd->db == 0)
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return (__fdnlist(kd->nlfd, nl));
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/*
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* We can use the kvm data base. Go through each nlist entry
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* and look it up with a db query.
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*/
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nvalid = 0;
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for (p = nl; p->n_name && p->n_name[0]; ++p) {
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register int len;
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DBT rec;
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if ((len = strlen(p->n_name)) > 4096) {
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/* sanity */
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_kvm_err(kd, kd->program, "symbol too large");
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return (-1);
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}
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rec.data = p->n_name;
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rec.size = len;
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if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0))
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continue;
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if (rec.data == 0 || rec.size != sizeof(struct nlist))
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continue;
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++nvalid;
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/*
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* Avoid alignment issues.
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*/
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bcopy((char *)&((struct nlist *)rec.data)->n_type,
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(char *)&p->n_type,
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sizeof(p->n_type));
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bcopy((char *)&((struct nlist *)rec.data)->n_value,
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(char *)&p->n_value,
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sizeof(p->n_value));
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}
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/*
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* Return the number of entries that weren't found.
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*/
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return ((p - nl) - nvalid);
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}
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ssize_t
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kvm_read(kd, kva, buf, len)
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kvm_t *kd;
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register u_long kva;
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register void *buf;
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register size_t len;
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{
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register int cc;
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register void *cp;
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if (ISALIVE(kd)) {
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/*
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* We're using /dev/kmem. Just read straight from the
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* device and let the active kernel do the address translation.
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*/
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errno = 0;
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if (lseek(kd->vmfd, (off_t)kva, 0) == -1 && errno != 0) {
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_kvm_err(kd, 0, "invalid address (%x)", kva);
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return (0);
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}
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cc = read(kd->vmfd, buf, len);
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if (cc < 0) {
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_kvm_syserr(kd, 0, "kvm_read");
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return (0);
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} else if (cc < len)
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_kvm_err(kd, kd->program, "short read");
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return (cc);
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} else {
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cp = buf;
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while (len > 0) {
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u_long pa;
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cc = _kvm_kvatop(kd, kva, &pa);
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if (cc == 0)
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return (0);
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if (cc > len)
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cc = len;
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errno = 0;
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if (lseek(kd->pmfd, (off_t)pa, 0) == -1 && errno != 0) {
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_kvm_syserr(kd, 0, _PATH_MEM);
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break;
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}
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cc = read(kd->pmfd, cp, cc);
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if (cc < 0) {
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_kvm_syserr(kd, kd->program, "kvm_read");
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break;
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}
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/*
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* If kvm_kvatop returns a bogus value or our core
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* file is truncated, we might wind up seeking beyond
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* the end of the core file in which case the read will
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* return 0 (EOF).
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*/
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if (cc == 0)
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break;
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(char *)cp += cc;
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kva += cc;
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len -= cc;
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}
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return ((char *)cp - (char *)buf);
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}
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/* NOTREACHED */
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}
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ssize_t
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kvm_write(kd, kva, buf, len)
|
|
kvm_t *kd;
|
|
register u_long kva;
|
|
register const void *buf;
|
|
register size_t len;
|
|
{
|
|
register 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 (0);
|
|
}
|
|
cc = write(kd->vmfd, buf, len);
|
|
if (cc < 0) {
|
|
_kvm_syserr(kd, 0, "kvm_write");
|
|
return (0);
|
|
} 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 (0);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|