133 lines
4.8 KiB
C
133 lines
4.8 KiB
C
/* $NetBSD: kern_sdt.c,v 1.3 2016/04/04 03:53:25 knakahara Exp $ */
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/*-
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* Copyright (c) 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by CoyotePoint Systems, Inc. It was developed under contract to
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* CoyotePoint by Darran Hunt.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright 2006-2008 John Birrell <jb@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/sys/kern/kern_sdt.c,v 1.1.4.1 2009/08/03 08:13:06 kensmith Exp $
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*
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* Backend for the Statically Defined Tracing (SDT) kernel support. This is
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* required to allow a module to load even though DTrace kernel support may
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* not be present. A module may be built with SDT probes in it.
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*
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*/
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#ifdef _KERNEL_OPT
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#include "opt_dtrace.h"
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#endif
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sdt.h>
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SDT_PROVIDER_DEFINE(sdt);
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void sdt_probe_stub(u_int32_t, uintptr_t, uintptr_t,
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uintptr_t, uintptr_t, uintptr_t);
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__link_set_decl(sdt_providers_set, struct sdt_provider);
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__link_set_decl(sdt_probes_set, struct sdt_probe);
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__link_set_decl(sdt_argtypes_set, struct sdt_argtype);
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/*
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* Hook for the DTrace probe function. The 'sdt' provider will set this
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* to dtrace_probe when it loads.
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*/
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sdt_probe_func_t sdt_probe_func = sdt_probe_stub;
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/*
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* This is a stub for probe calls in case kernel DTrace support isn't
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* compiled in. It should never get called because there is no DTrace
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* support to enable it.
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*/
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void
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sdt_probe_stub(u_int32_t id, uintptr_t arg0, uintptr_t arg1,
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uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
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{
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struct sdt_provider * const * provider;
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struct sdt_probe * const * probe;
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struct sdt_argtype * const * argtype;
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printf("%s: XXX should not be called\n", __func__);
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printf("providers: ");
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__link_set_foreach(provider, sdt_providers_set)
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printf("%s ", (*provider)->name);
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printf("\nprobes: ");
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__link_set_foreach(probe, sdt_probes_set)
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printf("%s ", (*probe)->name);
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printf("\nargtypes: ");
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__link_set_foreach(argtype, sdt_argtypes_set)
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printf("%s ", (*argtype)->type);
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printf("\n");
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}
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/*
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* initialize the SDT dtrace probe function
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*/
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void
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sdt_init(void *dtrace_probe)
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{
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sdt_probe_func = dtrace_probe;
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}
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/*
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* Disable the SDT dtrace probe function
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*/
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void
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sdt_exit(void)
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{
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sdt_probe_func = sdt_probe_stub;
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}
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