1 /* $NetBSD: kern_sdt.c,v 1.2 2015/10/02 16:54:15 christos 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 void sdt_probe_stub(u_int32_t, uintptr_t, uintptr_t, 75 uintptr_t, uintptr_t, uintptr_t); 76 77 __link_set_decl(sdt_providers_set, struct sdt_provider); 78 __link_set_decl(sdt_probes_set, struct sdt_probe); 79 __link_set_decl(sdt_argtypes_set, struct sdt_argtype); 80 81 /* 82 * Hook for the DTrace probe function. The 'sdt' provider will set this 83 * to dtrace_probe when it loads. 84 */ 85 sdt_probe_func_t sdt_probe_func = sdt_probe_stub; 86 87 /* 88 * This is a stub for probe calls in case kernel DTrace support isn't 89 * compiled in. It should never get called because there is no DTrace 90 * support to enable it. 91 */ 92 void 93 sdt_probe_stub(u_int32_t id, uintptr_t arg0, uintptr_t arg1, 94 uintptr_t arg2, uintptr_t arg3, uintptr_t arg4) 95 { 96 struct sdt_provider * const * provider; 97 struct sdt_probe * const * probe; 98 struct sdt_argtype * const * argtype; 99 printf("%s: XXX should not be called\n", __func__); 100 printf("providers: "); 101 __link_set_foreach(provider, sdt_providers_set) 102 printf("%s ", (*provider)->name); 103 printf("\nprobes: "); 104 __link_set_foreach(probe, sdt_probes_set) 105 printf("%s ", (*probe)->name); 106 printf("\nargtypes: "); 107 __link_set_foreach(argtype, sdt_argtypes_set) 108 printf("%s ", (*argtype)->type); 109 printf("\n"); 110 } 111 112 /* 113 * initialize the SDT dtrace probe function 114 */ 115 void 116 sdt_init(void *dtrace_probe) 117 { 118 119 sdt_probe_func = dtrace_probe; 120 } 121 122 /* 123 * Disable the SDT dtrace probe function 124 */ 125 void 126 sdt_exit(void) 127 { 128 129 sdt_probe_func = sdt_probe_stub; 130 } 131