1 | /* $NetBSD: kern_sdt.c,v 1.3 2016/04/04 03:53:25 knakahara Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 2010 The NetBSD Foundation, Inc. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to The NetBSD Foundation |
8 | * by CoyotePoint Systems, Inc. It was developed under contract to |
9 | * CoyotePoint by Darran Hunt. |
10 | * |
11 | * Redistribution and use in source and binary forms, with or without |
12 | * modification, are permitted provided that the following conditions |
13 | * are met: |
14 | * 1. Redistributions of source code must retain the above copyright |
15 | * notice, this list of conditions and the following disclaimer. |
16 | * 2. Redistributions in binary form must reproduce the above copyright |
17 | * notice, this list of conditions and the following disclaimer in the |
18 | * documentation and/or other materials provided with the distribution. |
19 | * |
20 | * |
21 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
23 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
24 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
25 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
26 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
27 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
28 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
29 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
30 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
31 | * POSSIBILITY OF SUCH DAMAGE. |
32 | */ |
33 | |
34 | /*- |
35 | * Copyright 2006-2008 John Birrell <jb@FreeBSD.org> |
36 | * |
37 | * Redistribution and use in source and binary forms, with or without |
38 | * modification, are permitted provided that the following conditions |
39 | * are met: |
40 | * 1. Redistributions of source code must retain the above copyright |
41 | * notice, this list of conditions and the following disclaimer. |
42 | * 2. Redistributions in binary form must reproduce the above copyright |
43 | * notice, this list of conditions and the following disclaimer in the |
44 | * documentation and/or other materials provided with the distribution. |
45 | * |
46 | * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
47 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
49 | * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE |
50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
52 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
53 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
54 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
55 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
56 | * SUCH DAMAGE. |
57 | * |
58 | * $FreeBSD: src/sys/kern/kern_sdt.c,v 1.1.4.1 2009/08/03 08:13:06 kensmith Exp $ |
59 | * |
60 | * Backend for the Statically Defined Tracing (SDT) kernel support. This is |
61 | * required to allow a module to load even though DTrace kernel support may |
62 | * not be present. A module may be built with SDT probes in it. |
63 | * |
64 | */ |
65 | #ifdef _KERNEL_OPT |
66 | #include "opt_dtrace.h" |
67 | #endif |
68 | |
69 | #include <sys/cdefs.h> |
70 | #include <sys/param.h> |
71 | #include <sys/systm.h> |
72 | #include <sys/sdt.h> |
73 | |
74 | SDT_PROVIDER_DEFINE(sdt); |
75 | |
76 | void sdt_probe_stub(u_int32_t, uintptr_t, uintptr_t, |
77 | uintptr_t, uintptr_t, uintptr_t); |
78 | |
79 | __link_set_decl(sdt_providers_set, struct sdt_provider); |
80 | __link_set_decl(sdt_probes_set, struct sdt_probe); |
81 | __link_set_decl(sdt_argtypes_set, struct sdt_argtype); |
82 | |
83 | /* |
84 | * Hook for the DTrace probe function. The 'sdt' provider will set this |
85 | * to dtrace_probe when it loads. |
86 | */ |
87 | sdt_probe_func_t sdt_probe_func = sdt_probe_stub; |
88 | |
89 | /* |
90 | * This is a stub for probe calls in case kernel DTrace support isn't |
91 | * compiled in. It should never get called because there is no DTrace |
92 | * support to enable it. |
93 | */ |
94 | void |
95 | sdt_probe_stub(u_int32_t id, uintptr_t arg0, uintptr_t arg1, |
96 | uintptr_t arg2, uintptr_t arg3, uintptr_t arg4) |
97 | { |
98 | struct sdt_provider * const * provider; |
99 | struct sdt_probe * const * probe; |
100 | struct sdt_argtype * const * argtype; |
101 | printf("%s: XXX should not be called\n" , __func__); |
102 | printf("providers: " ); |
103 | __link_set_foreach(provider, sdt_providers_set) |
104 | printf("%s " , (*provider)->name); |
105 | printf("\nprobes: " ); |
106 | __link_set_foreach(probe, sdt_probes_set) |
107 | printf("%s " , (*probe)->name); |
108 | printf("\nargtypes: " ); |
109 | __link_set_foreach(argtype, sdt_argtypes_set) |
110 | printf("%s " , (*argtype)->type); |
111 | printf("\n" ); |
112 | } |
113 | |
114 | /* |
115 | * initialize the SDT dtrace probe function |
116 | */ |
117 | void |
118 | sdt_init(void *dtrace_probe) |
119 | { |
120 | |
121 | sdt_probe_func = dtrace_probe; |
122 | } |
123 | |
124 | /* |
125 | * Disable the SDT dtrace probe function |
126 | */ |
127 | void |
128 | sdt_exit(void) |
129 | { |
130 | |
131 | sdt_probe_func = sdt_probe_stub; |
132 | } |
133 | |