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

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