957 lines
22 KiB
C
957 lines
22 KiB
C
/* $NetBSD: kvm.c,v 1.51 1997/04/09 21:11:41 thorpej Exp $ */
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/*-
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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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#if 0
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static char sccsid[] = "@(#)kvm.c 8.2 (Berkeley) 2/13/94";
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#else
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static char *rcsid = "$NetBSD: kvm.c,v 1.51 1997/04/09 21:11:41 thorpej Exp $";
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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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#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/core.h>
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#include <sys/exec_aout.h>
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#include <sys/kcore.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 <ctype.h>
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#include <db.h>
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#include <fcntl.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.h>
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#include "kvm_private.h"
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static int kvm_dbopen __P((kvm_t *));
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static int _kvm_get_header __P((kvm_t *));
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static kvm_t *_kvm_open __P((kvm_t *, const char *, const char *,
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const char *, int, char *));
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static int clear_gap __P((kvm_t *, FILE *, int));
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static off_t Lseek __P((kvm_t *, int, off_t, int));
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static ssize_t Read __P(( kvm_t *, int, void *, size_t));
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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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/*
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* Wrappers for Lseek/Read system calls. They check for errors and
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* call _kvm_syserr() if appropriate.
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*/
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static off_t
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Lseek(kd, fd, offset, whence)
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kvm_t *kd;
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int fd, whence;
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off_t offset;
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{
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off_t off;
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errno = 0;
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if ((off = lseek(fd, offset, whence)) == -1 && errno != 0) {
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_kvm_syserr(kd, kd->program, "Lseek");
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return (-1);
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}
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return (off);
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}
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static ssize_t
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Read(kd, fd, buf, nbytes)
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kvm_t *kd;
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int fd;
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void *buf;
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size_t nbytes;
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{
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ssize_t rv;
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errno = 0;
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if ((rv = read(fd, buf, nbytes)) != nbytes && errno != 0)
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_kvm_syserr(kd, kd->program, "Read");
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return (rv);
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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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int ufgiven;
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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->argbuf = 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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kd->kcore_hdr = 0;
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kd->cpu_dsize = 0;
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kd->cpu_data = 0;
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kd->dump_off = 0;
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ufgiven = (uf != NULL);
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if (!ufgiven)
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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 only try to use
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* the pre-built database if the namelist file name
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* pointer is NULL. If the database cannot or should
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* not be opened, open the namelist argument so we
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* revert to slow nlist() calls.
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*/
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if ((ufgiven || kvm_dbopen(kd) < 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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/*
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* If there is no valid core header, fail silently here.
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* The address translations however will fail without
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* header. Things can be made to run by calling
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* kvm_dump_mkheader() before doing any translation.
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*/
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if (_kvm_get_header(kd) == 0) {
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if (_kvm_initvtop(kd) < 0)
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goto failed;
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}
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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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(void)strncpy(errout, kd->errbuf, _POSIX2_LINE_MAX - 1);
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(void)kvm_close(kd);
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return (0);
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}
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/*
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* The kernel dump file (from savecore) contains:
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* kcore_hdr_t kcore_hdr;
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* kcore_seg_t cpu_hdr;
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* (opaque) cpu_data; (size is cpu_hdr.c_size)
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* kcore_seg_t mem_hdr;
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* (memory) mem_data; (size is mem_hdr.c_size)
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*
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* Note: khdr is padded to khdr.c_hdrsize;
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* cpu_hdr and mem_hdr are padded to khdr.c_seghdrsize
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*/
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static int
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_kvm_get_header(kd)
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kvm_t *kd;
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{
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kcore_hdr_t kcore_hdr;
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kcore_seg_t cpu_hdr;
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kcore_seg_t mem_hdr;
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size_t offset;
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ssize_t sz;
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/*
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* Read the kcore_hdr_t
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*/
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if (Lseek(kd, kd->pmfd, (off_t)0, SEEK_SET) == -1)
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return (-1);
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sz = Read(kd, kd->pmfd, &kcore_hdr, sizeof(kcore_hdr));
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if (sz != sizeof(kcore_hdr))
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return (-1);
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/*
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* Currently, we only support dump-files made by the current
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* architecture...
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*/
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if ((CORE_GETMAGIC(kcore_hdr) != KCORE_MAGIC) ||
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(CORE_GETMID(kcore_hdr) != MID_MACHINE))
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return (-1);
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/*
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* Currently, we only support exactly 2 segments: cpu-segment
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* and data-segment in exactly that order.
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*/
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if (kcore_hdr.c_nseg != 2)
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return (-1);
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/*
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* Save away the kcore_hdr. All errors after this
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* should do a to "goto fail" to deallocate things.
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*/
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kd->kcore_hdr = _kvm_malloc(kd, sizeof(kcore_hdr));
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memcpy(kd->kcore_hdr, &kcore_hdr, sizeof(kcore_hdr));
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offset = kcore_hdr.c_hdrsize;
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/*
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* Read the CPU segment header
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*/
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if (Lseek(kd, kd->pmfd, (off_t)offset, SEEK_SET) == -1)
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goto fail;
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sz = Read(kd, kd->pmfd, &cpu_hdr, sizeof(cpu_hdr));
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if (sz != sizeof(cpu_hdr))
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goto fail;
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if ((CORE_GETMAGIC(cpu_hdr) != KCORESEG_MAGIC) ||
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(CORE_GETFLAG(cpu_hdr) != CORE_CPU))
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goto fail;
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offset += kcore_hdr.c_seghdrsize;
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/*
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* Read the CPU segment DATA.
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*/
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kd->cpu_dsize = cpu_hdr.c_size;
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kd->cpu_data = _kvm_malloc(kd, cpu_hdr.c_size);
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if (kd->cpu_data == NULL)
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goto fail;
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if (Lseek(kd, kd->pmfd, (off_t)offset, SEEK_SET) == -1)
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goto fail;
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sz = Read(kd, kd->pmfd, kd->cpu_data, cpu_hdr.c_size);
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if (sz != cpu_hdr.c_size)
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goto fail;
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offset += cpu_hdr.c_size;
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/*
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* Read the next segment header: data segment
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*/
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if (Lseek(kd, kd->pmfd, (off_t)offset, SEEK_SET) == -1)
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goto fail;
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sz = Read(kd, kd->pmfd, &mem_hdr, sizeof(mem_hdr));
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if (sz != sizeof(mem_hdr))
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goto fail;
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offset += kcore_hdr.c_seghdrsize;
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if ((CORE_GETMAGIC(mem_hdr) != KCORESEG_MAGIC) ||
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(CORE_GETFLAG(mem_hdr) != CORE_DATA))
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goto fail;
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kd->dump_off = offset;
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return (0);
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fail:
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if (kd->kcore_hdr != NULL) {
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free(kd->kcore_hdr);
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kd->kcore_hdr = NULL;
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}
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if (kd->cpu_data != NULL) {
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free(kd->cpu_data);
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kd->cpu_data = NULL;
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kd->cpu_dsize = 0;
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}
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}
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/*
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* The format while on the dump device is: (new format)
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* kcore_seg_t cpu_hdr;
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* (opaque) cpu_data; (size is cpu_hdr.c_size)
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* kcore_seg_t mem_hdr;
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* (memory) mem_data; (size is mem_hdr.c_size)
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*/
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int
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kvm_dump_mkheader(kd, dump_off)
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kvm_t *kd;
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off_t dump_off;
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{
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kcore_seg_t cpu_hdr;
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int hdr_size, sz;
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if (kd->kcore_hdr != NULL) {
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_kvm_err(kd, kd->program, "already has a dump header");
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return (-1);
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}
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if (ISALIVE(kd)) {
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_kvm_err(kd, kd->program, "don't use on live kernel");
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return (-1);
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}
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/*
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* Validate new format crash dump
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*/
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if (Lseek(kd, kd->pmfd, dump_off, SEEK_SET) == -1)
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return (-1);
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sz = Read(kd, kd->pmfd, &cpu_hdr, sizeof(cpu_hdr));
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if (sz != sizeof(cpu_hdr))
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return (-1);
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if ((CORE_GETMAGIC(cpu_hdr) != KCORE_MAGIC)
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|| (CORE_GETMID(cpu_hdr) != MID_MACHINE)) {
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_kvm_err(kd, 0, "invalid magic in cpu_hdr");
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return (0);
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}
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hdr_size = ALIGN(sizeof(cpu_hdr));
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/*
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* Read the CPU segment.
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*/
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kd->cpu_dsize = cpu_hdr.c_size;
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kd->cpu_data = _kvm_malloc(kd, kd->cpu_dsize);
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if (kd->cpu_data == NULL)
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goto fail;
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if (Lseek(kd, kd->pmfd, dump_off+hdr_size, SEEK_SET) == -1)
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goto fail;
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sz = Read(kd, kd->pmfd, kd->cpu_data, cpu_hdr.c_size);
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if (sz != cpu_hdr.c_size)
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goto fail;
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hdr_size += kd->cpu_dsize;
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/*
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* Leave phys mem pointer at beginning of memory data
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*/
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kd->dump_off = dump_off + hdr_size;
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if (Lseek(kd, kd->pmfd, kd->dump_off, SEEK_SET) == -1)
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goto fail;
|
|
|
|
/*
|
|
* Create a kcore_hdr.
|
|
*/
|
|
kd->kcore_hdr = _kvm_malloc(kd, sizeof(kcore_hdr_t));
|
|
if (kd->kcore_hdr == NULL)
|
|
goto fail;
|
|
|
|
kd->kcore_hdr->c_hdrsize = ALIGN(sizeof(kcore_hdr_t));
|
|
kd->kcore_hdr->c_seghdrsize = ALIGN(sizeof(kcore_seg_t));
|
|
kd->kcore_hdr->c_nseg = 2;
|
|
CORE_SETMAGIC(*(kd->kcore_hdr), KCORE_MAGIC, MID_MACHINE,0);
|
|
|
|
/*
|
|
* Now that we have a valid header, enable translations.
|
|
*/
|
|
if (_kvm_initvtop(kd) == 0)
|
|
/* Success */
|
|
return (hdr_size);
|
|
|
|
fail:
|
|
if (kd->kcore_hdr != NULL) {
|
|
free(kd->kcore_hdr);
|
|
kd->kcore_hdr = NULL;
|
|
}
|
|
if (kd->cpu_data != NULL) {
|
|
free(kd->cpu_data);
|
|
kd->cpu_data = NULL;
|
|
kd->cpu_dsize = 0;
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
static int
|
|
clear_gap(kd, fp, size)
|
|
kvm_t *kd;
|
|
FILE *fp;
|
|
int size;
|
|
{
|
|
if (size <= 0) /* XXX - < 0 should never happen */
|
|
return (0);
|
|
while (size-- > 0) {
|
|
if (fputc(0, fp) == EOF) {
|
|
_kvm_syserr(kd, kd->program, "clear_gap");
|
|
return (-1);
|
|
}
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write the dump header info to 'fp'. Note that we can't use fseek(3) here
|
|
* because 'fp' might be a file pointer obtained by zopen().
|
|
*/
|
|
int
|
|
kvm_dump_wrtheader(kd, fp, dumpsize)
|
|
kvm_t *kd;
|
|
FILE *fp;
|
|
int dumpsize;
|
|
{
|
|
kcore_seg_t seghdr;
|
|
long offset;
|
|
int gap;
|
|
|
|
if (kd->kcore_hdr == NULL || kd->cpu_data == NULL) {
|
|
_kvm_err(kd, kd->program, "no valid dump header(s)");
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Write the generic header
|
|
*/
|
|
offset = 0;
|
|
if (fwrite((void*)kd->kcore_hdr, sizeof(kcore_hdr_t), 1, fp) <= 0) {
|
|
_kvm_syserr(kd, kd->program, "kvm_dump_wrtheader");
|
|
return (-1);
|
|
}
|
|
offset += kd->kcore_hdr->c_hdrsize;
|
|
gap = kd->kcore_hdr->c_hdrsize - sizeof(kcore_hdr_t);
|
|
if (clear_gap(kd, fp, gap) == -1)
|
|
return (-1);
|
|
|
|
/*
|
|
* Write the cpu header
|
|
*/
|
|
CORE_SETMAGIC(seghdr, KCORESEG_MAGIC, 0, CORE_CPU);
|
|
seghdr.c_size = ALIGN(kd->cpu_dsize);
|
|
if (fwrite((void*)&seghdr, sizeof(seghdr), 1, fp) <= 0) {
|
|
_kvm_syserr(kd, kd->program, "kvm_dump_wrtheader");
|
|
return (-1);
|
|
}
|
|
offset += kd->kcore_hdr->c_seghdrsize;
|
|
gap = kd->kcore_hdr->c_seghdrsize - sizeof(seghdr);
|
|
if (clear_gap(kd, fp, gap) == -1)
|
|
return (-1);
|
|
|
|
if (fwrite((void*)kd->cpu_data, kd->cpu_dsize, 1, fp) <= 0) {
|
|
_kvm_syserr(kd, kd->program, "kvm_dump_wrtheader");
|
|
return (-1);
|
|
}
|
|
offset += seghdr.c_size;
|
|
gap = seghdr.c_size - kd->cpu_dsize;
|
|
if (clear_gap(kd, fp, gap) == -1)
|
|
return (-1);
|
|
|
|
/*
|
|
* Write the actual dump data segment header
|
|
*/
|
|
CORE_SETMAGIC(seghdr, KCORESEG_MAGIC, 0, CORE_DATA);
|
|
seghdr.c_size = dumpsize;
|
|
if (fwrite((void*)&seghdr, sizeof(seghdr), 1, fp) <= 0) {
|
|
_kvm_syserr(kd, kd->program, "kvm_dump_wrtheader");
|
|
return (-1);
|
|
}
|
|
offset += kd->kcore_hdr->c_seghdrsize;
|
|
gap = kd->kcore_hdr->c_seghdrsize - sizeof(seghdr);
|
|
if (clear_gap(kd, fp, gap) == -1)
|
|
return (-1);
|
|
|
|
return (offset);
|
|
}
|
|
|
|
kvm_t *
|
|
kvm_openfiles(uf, mf, sf, flag, errout)
|
|
const char *uf;
|
|
const char *mf;
|
|
const char *sf;
|
|
int flag;
|
|
char *errout;
|
|
{
|
|
register kvm_t *kd;
|
|
|
|
if ((kd = malloc(sizeof(*kd))) == NULL) {
|
|
(void)strncpy(errout, strerror(errno), _POSIX2_LINE_MAX - 1);
|
|
return (0);
|
|
}
|
|
kd->program = 0;
|
|
return (_kvm_open(kd, uf, mf, sf, flag, errout));
|
|
}
|
|
|
|
kvm_t *
|
|
kvm_open(uf, mf, sf, flag, program)
|
|
const char *uf;
|
|
const char *mf;
|
|
const char *sf;
|
|
int flag;
|
|
const char *program;
|
|
{
|
|
register kvm_t *kd;
|
|
|
|
if ((kd = malloc(sizeof(*kd))) == NULL && program != NULL) {
|
|
(void)fprintf(stderr, "%s: %s\n", program, strerror(errno));
|
|
return (0);
|
|
}
|
|
kd->program = program;
|
|
return (_kvm_open(kd, uf, mf, sf, flag, NULL));
|
|
}
|
|
|
|
int
|
|
kvm_close(kd)
|
|
kvm_t *kd;
|
|
{
|
|
register int error = 0;
|
|
|
|
if (kd->pmfd >= 0)
|
|
error |= close(kd->pmfd);
|
|
if (kd->vmfd >= 0)
|
|
error |= close(kd->vmfd);
|
|
if (kd->nlfd >= 0)
|
|
error |= close(kd->nlfd);
|
|
if (kd->swfd >= 0)
|
|
error |= close(kd->swfd);
|
|
if (kd->db != 0)
|
|
error |= (kd->db->close)(kd->db);
|
|
if (kd->vmst)
|
|
_kvm_freevtop(kd);
|
|
kd->cpu_dsize = 0;
|
|
if (kd->cpu_data != NULL)
|
|
free((void *)kd->cpu_data);
|
|
if (kd->kcore_hdr != NULL)
|
|
free((void *)kd->kcore_hdr);
|
|
if (kd->procbase != 0)
|
|
free((void *)kd->procbase);
|
|
if (kd->swapspc != 0)
|
|
free((void *)kd->swapspc);
|
|
if (kd->argspc != 0)
|
|
free((void *)kd->argspc);
|
|
if (kd->argbuf != 0)
|
|
free((void *)kd->argbuf);
|
|
if (kd->argv != 0)
|
|
free((void *)kd->argv);
|
|
free((void *)kd);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Set up state necessary to do queries on the kernel namelist
|
|
* data base. If the data base is out-of-data/incompatible with
|
|
* given executable, set up things so we revert to standard nlist call.
|
|
* Only called for live kernels. Return 0 on success, -1 on failure.
|
|
*/
|
|
static int
|
|
kvm_dbopen(kd)
|
|
kvm_t *kd;
|
|
{
|
|
DBT rec;
|
|
int dbversionlen;
|
|
struct nlist nitem;
|
|
char dbversion[_POSIX2_LINE_MAX];
|
|
char kversion[_POSIX2_LINE_MAX];
|
|
|
|
kd->db = dbopen(_PATH_KVMDB, O_RDONLY, 0, DB_HASH, NULL);
|
|
if (kd->db == 0)
|
|
return (-1);
|
|
/*
|
|
* read version out of database
|
|
*/
|
|
rec.data = VRS_KEY;
|
|
rec.size = sizeof(VRS_KEY) - 1;
|
|
if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0))
|
|
goto close;
|
|
if (rec.data == 0 || rec.size > sizeof(dbversion))
|
|
goto close;
|
|
|
|
bcopy(rec.data, dbversion, rec.size);
|
|
dbversionlen = rec.size;
|
|
/*
|
|
* Read version string from kernel memory.
|
|
* Since we are dealing with a live kernel, we can call kvm_read()
|
|
* at this point.
|
|
*/
|
|
rec.data = VRS_SYM;
|
|
rec.size = sizeof(VRS_SYM) - 1;
|
|
if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0))
|
|
goto close;
|
|
if (rec.data == 0 || rec.size != sizeof(struct nlist))
|
|
goto close;
|
|
bcopy((char *)rec.data, (char *)&nitem, sizeof(nitem));
|
|
if (kvm_read(kd, (u_long)nitem.n_value, kversion, dbversionlen) !=
|
|
dbversionlen)
|
|
goto close;
|
|
/*
|
|
* If they match, we win - otherwise clear out kd->db so
|
|
* we revert to slow nlist().
|
|
*/
|
|
if (bcmp(dbversion, kversion, dbversionlen) == 0)
|
|
return (0);
|
|
close:
|
|
(void)(kd->db->close)(kd->db);
|
|
kd->db = 0;
|
|
|
|
return (-1);
|
|
}
|
|
|
|
int
|
|
kvm_nlist(kd, nl)
|
|
kvm_t *kd;
|
|
struct nlist *nl;
|
|
{
|
|
register struct nlist *p;
|
|
register int nvalid, rv;
|
|
|
|
/*
|
|
* If we can't use the data base, revert to the
|
|
* slow library call.
|
|
*/
|
|
if (kd->db == 0) {
|
|
rv = __fdnlist(kd->nlfd, nl);
|
|
if (rv == -1)
|
|
_kvm_err(kd, 0, "bad namelist");
|
|
return (rv);
|
|
}
|
|
|
|
/*
|
|
* We can use the kvm data base. Go through each nlist entry
|
|
* and look it up with a db query.
|
|
*/
|
|
nvalid = 0;
|
|
for (p = nl; p->n_name && p->n_name[0]; ++p) {
|
|
register int len;
|
|
DBT rec;
|
|
|
|
if ((len = strlen(p->n_name)) > 4096) {
|
|
/* sanity */
|
|
_kvm_err(kd, kd->program, "symbol too large");
|
|
return (-1);
|
|
}
|
|
rec.data = p->n_name;
|
|
rec.size = len;
|
|
|
|
/*
|
|
* Make sure that n_value = 0 when the symbol isn't found
|
|
*/
|
|
p->n_value = 0;
|
|
|
|
if ((kd->db->get)(kd->db, (DBT *)&rec, (DBT *)&rec, 0))
|
|
continue;
|
|
if (rec.data == 0 || rec.size != sizeof(struct nlist))
|
|
continue;
|
|
++nvalid;
|
|
/*
|
|
* Avoid alignment issues.
|
|
*/
|
|
bcopy((char *)&((struct nlist *)rec.data)->n_type,
|
|
(char *)&p->n_type,
|
|
sizeof(p->n_type));
|
|
bcopy((char *)&((struct nlist *)rec.data)->n_value,
|
|
(char *)&p->n_value,
|
|
sizeof(p->n_value));
|
|
}
|
|
/*
|
|
* Return the number of entries that weren't found.
|
|
*/
|
|
return ((p - nl) - nvalid);
|
|
}
|
|
|
|
int kvm_dump_inval(kd)
|
|
kvm_t *kd;
|
|
{
|
|
struct nlist nlist[2];
|
|
u_long pa;
|
|
|
|
if (ISALIVE(kd)) {
|
|
_kvm_err(kd, kd->program, "clearing dump on live kernel");
|
|
return (-1);
|
|
}
|
|
nlist[0].n_name = "_dumpmag";
|
|
nlist[1].n_name = NULL;
|
|
|
|
if (kvm_nlist(kd, nlist) == -1) {
|
|
_kvm_err(kd, 0, "bad namelist");
|
|
return (-1);
|
|
}
|
|
if (_kvm_kvatop(kd, (u_long)nlist[0].n_value, &pa) == 0)
|
|
return (-1);
|
|
|
|
errno = 0;
|
|
if (lseek(kd->pmfd, _kvm_pa2off(kd, pa), SEEK_SET) == -1
|
|
&& errno != 0) {
|
|
_kvm_err(kd, 0, "cannot invalidate dump - lseek");
|
|
return (-1);
|
|
}
|
|
pa = 0;
|
|
if (write(kd->pmfd, &pa, sizeof(pa)) != sizeof(pa)) {
|
|
_kvm_err(kd, 0, "cannot invalidate dump - write");
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
ssize_t
|
|
kvm_read(kd, kva, buf, len)
|
|
kvm_t *kd;
|
|
register u_long kva;
|
|
register void *buf;
|
|
register size_t len;
|
|
{
|
|
register int cc;
|
|
register void *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, SEEK_SET) == -1
|
|
&& errno != 0) {
|
|
_kvm_err(kd, 0, "invalid address (%x)", kva);
|
|
return (0);
|
|
}
|
|
cc = read(kd->vmfd, buf, len);
|
|
if (cc < 0) {
|
|
_kvm_syserr(kd, 0, "kvm_read");
|
|
return (0);
|
|
} else if (cc < len)
|
|
_kvm_err(kd, kd->program, "short read");
|
|
return (cc);
|
|
} else {
|
|
if ((kd->kcore_hdr == NULL) || (kd->cpu_data == NULL)) {
|
|
_kvm_err(kd, kd->program, "no valid dump header");
|
|
return (0);
|
|
}
|
|
cp = buf;
|
|
while (len > 0) {
|
|
u_long pa;
|
|
off_t foff;
|
|
|
|
cc = _kvm_kvatop(kd, kva, &pa);
|
|
if (cc == 0)
|
|
return (0);
|
|
if (cc > len)
|
|
cc = len;
|
|
foff = _kvm_pa2off(kd, pa);
|
|
errno = 0;
|
|
if (lseek(kd->pmfd, foff, SEEK_SET) == -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 = (char *)cp + cc;
|
|
kva += cc;
|
|
len -= cc;
|
|
}
|
|
return ((char *)cp - (char *)buf);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
ssize_t
|
|
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, SEEK_SET) == -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 */
|
|
}
|