1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright 2006-2008 John Birrell <jb@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/systm.h>
30 #include <sys/kdb.h>
31 #include <sys/sdt.h>
32
33 SDT_PROVIDER_DEFINE(sdt);
34
35 /*
36 * Hook for the DTrace probe function. The SDT provider will set this to
37 * dtrace_probe() when it loads.
38 */
39 sdt_probe_func_t sdt_probe_func = sdt_probe_stub;
40 volatile bool __read_frequently sdt_probes_enabled;
41
42 /*
43 * This is a stub for probe calls in case kernel DTrace support isn't
44 * enabled. It should never get called because there is no DTrace support
45 * to enable it.
46 */
47 void
sdt_probe_stub(uint32_t id,uintptr_t arg0,uintptr_t arg1,uintptr_t arg2,uintptr_t arg3,uintptr_t arg4)48 sdt_probe_stub(uint32_t id, uintptr_t arg0, uintptr_t arg1,
49 uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
50 {
51
52 printf("sdt_probe_stub: unexpectedly called\n");
53 kdb_backtrace();
54 }
55