567 lines
13 KiB
C
567 lines
13 KiB
C
/* $NetBSD: kvm.c,v 1.9 1998/02/03 19:12:46 perry Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1989, 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software developed by the Computer Systems
|
|
* Engineering group at Lawrence Berkeley Laboratory under DARPA contract
|
|
* BG 91-66 and contributed to Berkeley.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
static char sccsid[] = "@(#)kvm.c 8.2 (Berkeley) 2/13/94";
|
|
#else
|
|
__RCSID("$NetBSD: kvm.c,v 1.9 1998/02/03 19:12:46 perry Exp $");
|
|
#endif
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/user.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/sysctl.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/swap_pager.h>
|
|
|
|
#include <machine/vmparam.h>
|
|
|
|
#include <ctype.h>
|
|
#include <db.h>
|
|
#include <fcntl.h>
|
|
#include <kvm.h>
|
|
#include <limits.h>
|
|
#include <nlist.h>
|
|
#include <paths.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "kvm_private.h"
|
|
|
|
static int kvm_dbopen __P((kvm_t *));
|
|
static kvm_t *_kvm_open __P((kvm_t *, const char *, const char *,
|
|
const char *, int, char *));
|
|
|
|
char *
|
|
kvm_geterr(kd)
|
|
kvm_t *kd;
|
|
{
|
|
return (kd->errbuf);
|
|
}
|
|
|
|
#if __STDC__
|
|
#include <stdarg.h>
|
|
#else
|
|
#include <varargs.h>
|
|
#endif
|
|
|
|
/*
|
|
* Report an error using printf style arguments. "program" is kd->program
|
|
* on hard errors, and 0 on soft errors, so that under sun error emulation,
|
|
* only hard errors are printed out (otherwise, programs like gdb will
|
|
* generate tons of error messages when trying to access bogus pointers).
|
|
*/
|
|
void
|
|
#if __STDC__
|
|
_kvm_err(kvm_t *kd, const char *program, const char *fmt, ...)
|
|
#else
|
|
_kvm_err(kd, program, fmt, va_alist)
|
|
kvm_t *kd;
|
|
char *program, *fmt;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list ap;
|
|
|
|
#ifdef __STDC__
|
|
va_start(ap, fmt);
|
|
#else
|
|
va_start(ap);
|
|
#endif
|
|
if (program != NULL) {
|
|
(void)fprintf(stderr, "%s: ", program);
|
|
(void)vfprintf(stderr, fmt, ap);
|
|
(void)fputc('\n', stderr);
|
|
} else
|
|
(void)vsnprintf(kd->errbuf,
|
|
sizeof(kd->errbuf), (char *)fmt, ap);
|
|
|
|
va_end(ap);
|
|
}
|
|
|
|
void
|
|
#if __STDC__
|
|
_kvm_syserr(kvm_t *kd, const char *program, const char *fmt, ...)
|
|
#else
|
|
_kvm_syserr(kd, program, fmt, va_alist)
|
|
kvm_t *kd;
|
|
char *program, *fmt;
|
|
va_dcl
|
|
#endif
|
|
{
|
|
va_list ap;
|
|
int n;
|
|
|
|
#if __STDC__
|
|
va_start(ap, fmt);
|
|
#else
|
|
va_start(ap);
|
|
#endif
|
|
if (program != NULL) {
|
|
(void)fprintf(stderr, "%s: ", program);
|
|
(void)vfprintf(stderr, fmt, ap);
|
|
(void)fprintf(stderr, ": %s\n", strerror(errno));
|
|
} else {
|
|
char *cp = kd->errbuf;
|
|
|
|
(void)vsnprintf(cp, sizeof(kd->errbuf), (char *)fmt, ap);
|
|
n = strlen(cp);
|
|
(void)snprintf(&cp[n], sizeof(kd->errbuf) - n, ": %s",
|
|
strerror(errno));
|
|
}
|
|
va_end(ap);
|
|
}
|
|
|
|
void *
|
|
_kvm_malloc(kd, n)
|
|
kvm_t *kd;
|
|
size_t n;
|
|
{
|
|
void *p;
|
|
|
|
if ((p = malloc(n)) == NULL)
|
|
_kvm_err(kd, kd->program, strerror(errno));
|
|
return (p);
|
|
}
|
|
|
|
static kvm_t *
|
|
_kvm_open(kd, uf, mf, sf, flag, errout)
|
|
kvm_t *kd;
|
|
const char *uf;
|
|
const char *mf;
|
|
const char *sf;
|
|
int flag;
|
|
char *errout;
|
|
{
|
|
struct stat st;
|
|
int ufgiven;
|
|
|
|
kd->db = 0;
|
|
kd->pmfd = -1;
|
|
kd->vmfd = -1;
|
|
kd->swfd = -1;
|
|
kd->nlfd = -1;
|
|
kd->procbase = 0;
|
|
kd->nbpg = getpagesize();
|
|
kd->swapspc = 0;
|
|
kd->argspc = 0;
|
|
kd->argbuf = 0;
|
|
kd->argv = 0;
|
|
kd->vmst = 0;
|
|
kd->vm_page_buckets = 0;
|
|
|
|
/*
|
|
* Call the MD open hook. This sets:
|
|
* usrstack, min_uva, max_uva
|
|
*/
|
|
if (_kvm_mdopen(kd)) {
|
|
_kvm_err(kd, kd->program, "md init failed");
|
|
goto failed;
|
|
}
|
|
|
|
ufgiven = (uf != NULL);
|
|
if (!ufgiven)
|
|
uf = _PATH_UNIX;
|
|
else if (strlen(uf) >= MAXPATHLEN) {
|
|
_kvm_err(kd, kd->program, "exec file name too long");
|
|
goto failed;
|
|
}
|
|
if (flag & ~O_RDWR) {
|
|
_kvm_err(kd, kd->program, "bad flags arg");
|
|
goto failed;
|
|
}
|
|
if (mf == 0)
|
|
mf = _PATH_MEM;
|
|
if (sf == 0)
|
|
sf = _PATH_DRUM;
|
|
|
|
if ((kd->pmfd = open(mf, flag, 0)) < 0) {
|
|
_kvm_syserr(kd, kd->program, "%s", mf);
|
|
goto failed;
|
|
}
|
|
if (fstat(kd->pmfd, &st) < 0) {
|
|
_kvm_syserr(kd, kd->program, "%s", mf);
|
|
goto failed;
|
|
}
|
|
if (S_ISCHR(st.st_mode)) {
|
|
/*
|
|
* If this is a character special device, then check that
|
|
* it's /dev/mem. If so, open kmem too. (Maybe we should
|
|
* make it work for either /dev/mem or /dev/kmem -- in either
|
|
* case you're working with a live kernel.)
|
|
*/
|
|
if (strcmp(mf, _PATH_MEM) != 0) { /* XXX */
|
|
_kvm_err(kd, kd->program,
|
|
"%s: not physical memory device", mf);
|
|
goto failed;
|
|
}
|
|
if ((kd->vmfd = open(_PATH_KMEM, flag)) < 0) {
|
|
_kvm_syserr(kd, kd->program, "%s", _PATH_KMEM);
|
|
goto failed;
|
|
}
|
|
if ((kd->swfd = open(sf, flag, 0)) < 0) {
|
|
_kvm_syserr(kd, kd->program, "%s", sf);
|
|
goto failed;
|
|
}
|
|
/*
|
|
* Open kvm nlist database. We only try to use
|
|
* the pre-built database if the namelist file name
|
|
* pointer is NULL. If the database cannot or should
|
|
* not be opened, open the namelist argument so we
|
|
* revert to slow nlist() calls.
|
|
*/
|
|
if ((ufgiven || kvm_dbopen(kd) < 0) &&
|
|
(kd->nlfd = open(uf, O_RDONLY, 0)) < 0) {
|
|
_kvm_syserr(kd, kd->program, "%s", uf);
|
|
goto failed;
|
|
}
|
|
} else {
|
|
/*
|
|
* This is a crash dump.
|
|
* Initalize the virtual address translation machinery,
|
|
* but first setup the namelist fd.
|
|
*/
|
|
if ((kd->nlfd = open(uf, O_RDONLY, 0)) < 0) {
|
|
_kvm_syserr(kd, kd->program, "%s", uf);
|
|
goto failed;
|
|
}
|
|
if (_kvm_initvtop(kd) < 0)
|
|
goto failed;
|
|
}
|
|
return (kd);
|
|
failed:
|
|
/*
|
|
* Copy out the error if doing sane error semantics.
|
|
*/
|
|
if (errout != 0)
|
|
(void)strncpy(errout, kd->errbuf, _POSIX2_LINE_MAX - 1);
|
|
(void)kvm_close(kd);
|
|
return (0);
|
|
}
|
|
|
|
kvm_t *
|
|
kvm_openfiles(uf, mf, sf, flag, errout)
|
|
const char *uf;
|
|
const char *mf;
|
|
const char *sf;
|
|
int flag;
|
|
char *errout;
|
|
{
|
|
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;
|
|
{
|
|
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;
|
|
{
|
|
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);
|
|
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;
|
|
{
|
|
struct nlist *p;
|
|
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) {
|
|
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;
|
|
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);
|
|
}
|
|
|
|
ssize_t
|
|
kvm_read(kd, kva, buf, len)
|
|
kvm_t *kd;
|
|
u_long kva;
|
|
void *buf;
|
|
size_t len;
|
|
{
|
|
int cc;
|
|
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, 0) == -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 {
|
|
cp = buf;
|
|
while (len > 0) {
|
|
u_long pa;
|
|
|
|
cc = _kvm_kvatop(kd, kva, &pa);
|
|
if (cc == 0)
|
|
return (0);
|
|
if (cc > len)
|
|
cc = len;
|
|
errno = 0;
|
|
if (lseek(kd->pmfd, (off_t)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 = (char *)cp + cc;
|
|
kva += cc;
|
|
len -= cc;
|
|
}
|
|
return ((char *)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 (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 */
|
|
}
|