1 /* $NetBSD: kern_sdt.c,v 1.1 2010/03/01 21:10:17 darran 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 66 #include <sys/cdefs.h> 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/sdt.h> 70 71 void sdt_probe_stub(u_int32_t, uintptr_t, uintptr_t, 72 uintptr_t, uintptr_t, uintptr_t); 73 74 /* 75 * Hook for the DTrace probe function. The 'sdt' provider will set this 76 * to dtrace_probe when it loads. 77 */ 78 sdt_probe_func_t sdt_probe_func = sdt_probe_stub; 79 80 /* 81 * This is a stub for probe calls in case kernel DTrace support isn't 82 * compiled in. It should never get called because there is no DTrace 83 * support to enable it. 84 */ 85 void 86 sdt_probe_stub(u_int32_t id, uintptr_t arg0, uintptr_t arg1, 87 uintptr_t arg2, uintptr_t arg3, uintptr_t arg4) 88 { 89 printf("%s: XXX should not be called\n", __func__); 90 } 91 92 /* 93 * initialize the SDT dtrace probe function 94 */ 95 void 96 sdt_init(void *dtrace_probe) 97 { 98 99 sdt_probe_func = dtrace_probe; 100 } 101 102 /* 103 * Disable the SDT dtrace probe function 104 */ 105 void 106 sdt_exit(void) 107 { 108 109 sdt_probe_func = sdt_probe_stub; 110 } 111