FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_sdt.c

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

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