The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2007-2008 John Birrell <jb@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/10/sys/kern/kern_dtrace.c 269752 2014-08-09 14:05:01Z markj $");
   29 
   30 #include "opt_kdb.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/eventhandler.h>
   35 #include <sys/kdb.h>
   36 #include <sys/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/proc.h>
   39 #include <sys/dtrace_bsd.h>
   40 #include <sys/sysctl.h>
   41 #include <sys/sysent.h>
   42 
   43 #define KDTRACE_PROC_SIZE       64
   44 #define KDTRACE_THREAD_SIZE     256
   45 
   46 FEATURE(kdtrace_hooks,
   47     "Kernel DTrace hooks which are required to load DTrace kernel modules");
   48 
   49 static MALLOC_DEFINE(M_KDTRACE, "kdtrace", "DTrace hooks");
   50 
   51 /* Hooks used in the machine-dependent trap handlers. */
   52 dtrace_trap_func_t              dtrace_trap_func;
   53 dtrace_doubletrap_func_t        dtrace_doubletrap_func;
   54 dtrace_pid_probe_ptr_t          dtrace_pid_probe_ptr;
   55 dtrace_return_probe_ptr_t       dtrace_return_probe_ptr;
   56 
   57 systrace_probe_func_t           systrace_probe_func;
   58 
   59 /* Return the DTrace process data size compiled in the kernel hooks. */
   60 size_t
   61 kdtrace_proc_size()
   62 {
   63 
   64         return (KDTRACE_PROC_SIZE);
   65 }
   66 
   67 static void
   68 kdtrace_proc_ctor(void *arg __unused, struct proc *p)
   69 {
   70 
   71         p->p_dtrace = malloc(KDTRACE_PROC_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
   72 }
   73 
   74 static void
   75 kdtrace_proc_dtor(void *arg __unused, struct proc *p)
   76 {
   77 
   78         if (p->p_dtrace != NULL) {
   79                 free(p->p_dtrace, M_KDTRACE);
   80                 p->p_dtrace = NULL;
   81         }
   82 }
   83 
   84 /* Return the DTrace thread data size compiled in the kernel hooks. */
   85 size_t
   86 kdtrace_thread_size()
   87 {
   88 
   89         return (KDTRACE_THREAD_SIZE);
   90 }
   91 
   92 static void
   93 kdtrace_thread_ctor(void *arg __unused, struct thread *td)
   94 {
   95 
   96         td->td_dtrace = malloc(KDTRACE_THREAD_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
   97 }
   98 
   99 static void
  100 kdtrace_thread_dtor(void *arg __unused, struct thread *td)
  101 {
  102 
  103         if (td->td_dtrace != NULL) {
  104                 free(td->td_dtrace, M_KDTRACE);
  105                 td->td_dtrace = NULL;
  106         }
  107 }
  108 
  109 /*
  110  *  Initialise the kernel DTrace hooks.
  111  */
  112 static void
  113 init_dtrace(void *dummy __unused)
  114 {
  115 
  116         EVENTHANDLER_REGISTER(process_ctor, kdtrace_proc_ctor, NULL,
  117             EVENTHANDLER_PRI_ANY);
  118         EVENTHANDLER_REGISTER(process_dtor, kdtrace_proc_dtor, NULL,
  119             EVENTHANDLER_PRI_ANY);
  120         EVENTHANDLER_REGISTER(thread_ctor, kdtrace_thread_ctor, NULL,
  121             EVENTHANDLER_PRI_ANY);
  122         EVENTHANDLER_REGISTER(thread_dtor, kdtrace_thread_dtor, NULL,
  123             EVENTHANDLER_PRI_ANY);
  124 }
  125 
  126 SYSINIT(kdtrace, SI_SUB_KDTRACE, SI_ORDER_FIRST, init_dtrace, NULL);

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