xref: /freebsd/sys/kern/kern_sdt.c (revision 70c712a86da5d9760074b84dee15e229190bbd11)

/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright 2006-2008 John Birrell <jb@FreeBSD.org>
 *
 * 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 AUTHOR 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 AUTHOR 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/param.h>
#include <sys/systm.h>
#include <sys/kdb.h>
#include <sys/proc.h>
#include <sys/sdt.h>

SDT_PROVIDER_DEFINE(sdt);

/*
 * Hook for the DTrace probe function. The SDT provider will set this to
 * dtrace_probe() when it loads.
 */
sdt_probe_func_t sdt_probe_func = sdt_probe_stub;
volatile bool __read_frequently sdt_probes_enabled;

/*
 * This is a stub for probe calls in case kernel DTrace support isn't
 * enabled. It should never get called because there is no DTrace support
 * to enable it.
 */
void
sdt_probe_stub(uint32_t id __unused, uintptr_t arg0 __unused,
    uintptr_t arg1 __unused, uintptr_t arg2 __unused, uintptr_t arg3 __unused,
    uintptr_t arg4 __unused, uintptr_t arg5 __unused)
{
	printf("sdt_probe_stub: unexpectedly called\n");
	kdb_backtrace();
}

void
sdt_probe(uint32_t id, uintptr_t arg0, uintptr_t arg1,
    uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
{
	sdt_probe_func(id, arg0, arg1, arg2, arg3, arg4, 0);
}

void
sdt_probe6(uint32_t id, uintptr_t arg0, uintptr_t arg1,
    uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5)
{
	sdt_probe_func(id, arg0, arg1, arg2, arg3, arg4, arg5);
}