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freebsd-dev/sys/compat/linux/linux_time.c
Alexander Leidinger 19e252baeb - >500 static DTrace probes for the linuxulator 
- DTrace scripts to check for errors, performance, ...
  they serve mostly as examples of what you can do with the static probe;s
  with moderate load the scripts may be overwhelmed, excessive lock-tracing
  may influence program behavior (see the last design decission)

Design decissions:
 - use "linuxulator" as the provider for the native bitsize; add the
   bitsize for the non-native emulation (e.g. "linuxuator32" on amd64)
 - Add probes only for locks which are acquired in one function and released
   in another function. Locks which are aquired and released in the same
   function should be easy to pair in the code, inter-function
   locking is more easy to verify in DTrace.
 - Probes for locks should be fired after locking and before releasing to
   prevent races (to provide data/function stability in DTrace, see the
   man-page of "dtrace -v ..." and the corresponding DTrace docs).
2012-05-05 19:42:38 +00:00

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/* $NetBSD: linux_time.c,v 1.14 2006/05/14 03:40:54 christos Exp $ */
/*-
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Emmanuel Dreyfus.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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>
__FBSDID("$FreeBSD$");
#if 0
__KERNEL_RCSID(0, "$NetBSD: linux_time.c,v 1.14 2006/05/14 03:40:54 christos Exp $");
#endif
#include "opt_compat.h"
#include "opt_kdtrace.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/sdt.h>
#include <sys/signal.h>
#include <sys/stdint.h>
#include <sys/syscallsubr.h>
#include <sys/sysproto.h>
#include <sys/time.h>
#include <sys/systm.h>
#include <sys/proc.h>
#ifdef COMPAT_LINUX32
#include <machine/../linux32/linux.h>
#include <machine/../linux32/linux32_proto.h>
#else
#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#endif
#include <compat/linux/linux_dtrace.h>
/* DTrace init */
LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);
/**
* DTrace probes in this module.
*/
LIN_SDT_PROBE_DEFINE2(time, native_to_linux_timespec, entry,
"struct l_timespec *", "struct timespec *");
LIN_SDT_PROBE_DEFINE0(time, native_to_linux_timespec, return);
LIN_SDT_PROBE_DEFINE2(time, linux_to_native_timespec, entry,
"struct timespec *", "struct l_timespec *");
LIN_SDT_PROBE_DEFINE1(time, linux_to_native_timespec, return, "int");
LIN_SDT_PROBE_DEFINE2(time, linux_to_native_clockid, entry, "clockid_t *",
"clockid_t");
LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, unsupported_clockid,
"clockid_t");
LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, unknown_clockid,
"clockid_t");
LIN_SDT_PROBE_DEFINE1(time, linux_to_native_clockid, return, "int");
LIN_SDT_PROBE_DEFINE2(time, linux_clock_gettime, entry, "clockid_t",
"struct l_timespec *");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, gettime_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_gettime, return, "int");
LIN_SDT_PROBE_DEFINE2(time, linux_clock_settime, entry, "clockid_t",
"struct l_timespec *");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, settime_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_settime, return, "int");
LIN_SDT_PROBE_DEFINE2(time, linux_clock_getres, entry, "clockid_t",
"struct l_timespec *");
LIN_SDT_PROBE_DEFINE0(time, linux_clock_getres, nullcall);
LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, getres_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_getres, return, "int");
LIN_SDT_PROBE_DEFINE2(time, linux_nanosleep, entry, "const struct l_timespec *",
"struct l_timespec *");
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, nanosleep_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_nanosleep, return, "int");
LIN_SDT_PROBE_DEFINE4(time, linux_clock_nanosleep, entry, "clockid_t", "int",
"struct l_timespec *", "struct l_timespec *");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, conversion_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, nanosleep_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, copyout_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, copyin_error, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, unsupported_flags, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, unsupported_clockid, "int");
LIN_SDT_PROBE_DEFINE1(time, linux_clock_nanosleep, return, "int");
static void native_to_linux_timespec(struct l_timespec *,
struct timespec *);
static int linux_to_native_timespec(struct timespec *,
struct l_timespec *);
static int linux_to_native_clockid(clockid_t *, clockid_t);
static void
native_to_linux_timespec(struct l_timespec *ltp, struct timespec *ntp)
{
LIN_SDT_PROBE2(time, native_to_linux_timespec, entry, ltp, ntp);
ltp->tv_sec = ntp->tv_sec;
ltp->tv_nsec = ntp->tv_nsec;
LIN_SDT_PROBE0(time, native_to_linux_timespec, return);
}
static int
linux_to_native_timespec(struct timespec *ntp, struct l_timespec *ltp)
{
LIN_SDT_PROBE2(time, linux_to_native_timespec, entry, ntp, ltp);
if (ltp->tv_sec < 0 || ltp->tv_nsec > (l_long)999999999L) {
LIN_SDT_PROBE1(time, linux_to_native_timespec, return, EINVAL);
return (EINVAL);
}
ntp->tv_sec = ltp->tv_sec;
ntp->tv_nsec = ltp->tv_nsec;
LIN_SDT_PROBE1(time, linux_to_native_timespec, return, 0);
return (0);
}
static int
linux_to_native_clockid(clockid_t *n, clockid_t l)
{
LIN_SDT_PROBE2(time, linux_to_native_clockid, entry, n, l);
switch (l) {
case LINUX_CLOCK_REALTIME:
*n = CLOCK_REALTIME;
break;
case LINUX_CLOCK_MONOTONIC:
*n = CLOCK_MONOTONIC;
break;
case LINUX_CLOCK_PROCESS_CPUTIME_ID:
case LINUX_CLOCK_THREAD_CPUTIME_ID:
case LINUX_CLOCK_REALTIME_HR:
case LINUX_CLOCK_MONOTONIC_HR:
LIN_SDT_PROBE1(time, linux_to_native_clockid,
unsupported_clockid, l);
LIN_SDT_PROBE1(time, linux_to_native_clockid, return, EINVAL);
return (EINVAL);
break;
default:
LIN_SDT_PROBE1(time, linux_to_native_clockid,
unknown_clockid, l);
LIN_SDT_PROBE1(time, linux_to_native_clockid, return, EINVAL);
return (EINVAL);
break;
}
LIN_SDT_PROBE1(time, linux_to_native_clockid, return, 0);
return (0);
}
int
linux_clock_gettime(struct thread *td, struct linux_clock_gettime_args *args)
{
struct l_timespec lts;
int error;
clockid_t nwhich = 0; /* XXX: GCC */
struct timespec tp;
LIN_SDT_PROBE2(time, linux_clock_gettime, entry, args->which, args->tp);
error = linux_to_native_clockid(&nwhich, args->which);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_gettime, conversion_error,
error);
LIN_SDT_PROBE1(time, linux_clock_gettime, return, error);
return (error);
}
error = kern_clock_gettime(td, nwhich, &tp);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_gettime, gettime_error, error);
LIN_SDT_PROBE1(time, linux_clock_gettime, return, error);
return (error);
}
native_to_linux_timespec(&lts, &tp);
error = copyout(&lts, args->tp, sizeof lts);
if (error != 0)
LIN_SDT_PROBE1(time, linux_clock_gettime, copyout_error, error);
LIN_SDT_PROBE1(time, linux_clock_gettime, return, error);
return (error);
}
int
linux_clock_settime(struct thread *td, struct linux_clock_settime_args *args)
{
struct timespec ts;
struct l_timespec lts;
int error;
clockid_t nwhich = 0; /* XXX: GCC */
LIN_SDT_PROBE2(time, linux_clock_settime, entry, args->which, args->tp);
error = linux_to_native_clockid(&nwhich, args->which);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_settime, conversion_error,
error);
LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
return (error);
}
error = copyin(args->tp, &lts, sizeof lts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_settime, copyin_error, error);
LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
return (error);
}
error = linux_to_native_timespec(&ts, &lts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_settime, conversion_error,
error);
LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
return (error);
}
error = kern_clock_settime(td, nwhich, &ts);
if (error != 0)
LIN_SDT_PROBE1(time, linux_clock_settime, settime_error, error);
LIN_SDT_PROBE1(time, linux_clock_settime, return, error);
return (error);
}
int
linux_clock_getres(struct thread *td, struct linux_clock_getres_args *args)
{
struct timespec ts;
struct l_timespec lts;
int error;
clockid_t nwhich = 0; /* XXX: GCC */
LIN_SDT_PROBE2(time, linux_clock_getres, entry, args->which, args->tp);
if (args->tp == NULL) {
LIN_SDT_PROBE0(time, linux_clock_getres, nullcall);
LIN_SDT_PROBE1(time, linux_clock_getres, return, 0);
return (0);
}
error = linux_to_native_clockid(&nwhich, args->which);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_getres, conversion_error,
error);
LIN_SDT_PROBE1(time, linux_clock_getres, return, error);
return (error);
}
error = kern_clock_getres(td, nwhich, &ts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_getres, getres_error, error);
LIN_SDT_PROBE1(time, linux_clock_getres, return, error);
return (error);
}
native_to_linux_timespec(&lts, &ts);
error = copyout(&lts, args->tp, sizeof lts);
if (error != 0)
LIN_SDT_PROBE1(time, linux_clock_getres, copyout_error, error);
LIN_SDT_PROBE1(time, linux_clock_getres, return, error);
return (error);
}
int
linux_nanosleep(struct thread *td, struct linux_nanosleep_args *args)
{
struct timespec *rmtp;
struct l_timespec lrqts, lrmts;
struct timespec rqts, rmts;
int error;
LIN_SDT_PROBE2(time, linux_nanosleep, entry, args->rqtp, args->rmtp);
error = copyin(args->rqtp, &lrqts, sizeof lrqts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_nanosleep, copyin_error, error);
LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
return (error);
}
if (args->rmtp != NULL)
rmtp = &rmts;
else
rmtp = NULL;
error = linux_to_native_timespec(&rqts, &lrqts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_nanosleep, conversion_error, error);
LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
return (error);
}
error = kern_nanosleep(td, &rqts, rmtp);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_nanosleep, nanosleep_error, error);
LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
return (error);
}
if (args->rmtp != NULL) {
native_to_linux_timespec(&lrmts, rmtp);
error = copyout(&lrmts, args->rmtp, sizeof(lrmts));
if (error != 0) {
LIN_SDT_PROBE1(time, linux_nanosleep, copyout_error,
error);
LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
return (error);
}
}
LIN_SDT_PROBE1(time, linux_nanosleep, return, 0);
return (0);
}
int
linux_clock_nanosleep(struct thread *td, struct linux_clock_nanosleep_args *args)
{
struct timespec *rmtp;
struct l_timespec lrqts, lrmts;
struct timespec rqts, rmts;
int error;
LIN_SDT_PROBE4(time, linux_clock_nanosleep, entry, args->which,
args->flags, args->rqtp, args->rmtp);
if (args->flags != 0) {
/* XXX deal with TIMER_ABSTIME */
LIN_SDT_PROBE1(time, linux_clock_nanosleep, unsupported_flags,
args->flags);
LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, EINVAL);
return (EINVAL); /* XXX deal with TIMER_ABSTIME */
}
if (args->which != LINUX_CLOCK_REALTIME) {
LIN_SDT_PROBE1(time, linux_clock_nanosleep, unsupported_clockid,
args->which);
LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, EINVAL);
return (EINVAL);
}
error = copyin(args->rqtp, &lrqts, sizeof lrqts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_nanosleep, copyin_error,
error);
LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, error);
return (error);
}
if (args->rmtp != NULL)
rmtp = &rmts;
else
rmtp = NULL;
error = linux_to_native_timespec(&rqts, &lrqts);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_nanosleep, conversion_error,
error);
LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, error);
return (error);
}
error = kern_nanosleep(td, &rqts, rmtp);
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_nanosleep, nanosleep_error,
error);
LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, error);
return (error);
}
if (args->rmtp != NULL) {
native_to_linux_timespec(&lrmts, rmtp);
error = copyout(&lrmts, args->rmtp, sizeof lrmts );
if (error != 0) {
LIN_SDT_PROBE1(time, linux_clock_nanosleep,
copyout_error, error);
LIN_SDT_PROBE1(time, linux_nanosleep, return, error);
return (error);
}
}
LIN_SDT_PROBE1(time, linux_clock_nanosleep, return, 0);
return (0);
}
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