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/proc.h> 32 #include <sys/sdt.h> 33 34 SDT_PROVIDER_DEFINE(sdt); 35 36 /* 37 * Hook for the DTrace probe function. The SDT provider will set this to 38 * dtrace_probe() when it loads. 39 */ 40 sdt_probe_func_t sdt_probe_func = sdt_probe_stub; 41 volatile bool __read_frequently sdt_probes_enabled; 42 43 /* 44 * This is a stub for probe calls in case kernel DTrace support isn't 45 * enabled. It should never get called because there is no DTrace support 46 * to enable it. 47 */ 48 void 49 sdt_probe_stub(uint32_t id __unused, uintptr_t arg0 __unused, 50 uintptr_t arg1 __unused, uintptr_t arg2 __unused, uintptr_t arg3 __unused, 51 uintptr_t arg4 __unused, uintptr_t arg5 __unused) 52 { 53 printf("sdt_probe_stub: unexpectedly called\n"); 54 kdb_backtrace(); 55 } 56 57 void 58 sdt_probe(uint32_t id, uintptr_t arg0, uintptr_t arg1, 59 uintptr_t arg2, uintptr_t arg3, uintptr_t arg4) 60 { 61 sdt_probe_func(id, arg0, arg1, arg2, arg3, arg4, 0); 62 } 63 64 void 65 sdt_probe6(uint32_t id, uintptr_t arg0, uintptr_t arg1, 66 uintptr_t arg2, uintptr_t arg3, uintptr_t arg4, uintptr_t arg5) 67 { 68 sdt_probe_func(id, arg0, arg1, arg2, arg3, arg4, arg5); 69 } 70