mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*-
|
|
* Copyright (c) 2007-2008 John Birrell <jb@FreeBSD.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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 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 THE 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_kdb.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/eventhandler.h>
|
|
#include <sys/kdb.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/dtrace_bsd.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/sysent.h>
|
|
|
|
#define KDTRACE_PROC_SIZE 64
|
|
#define KDTRACE_THREAD_SIZE 256
|
|
|
|
FEATURE(kdtrace_hooks,
|
|
"Kernel DTrace hooks which are required to load DTrace kernel modules");
|
|
|
|
static MALLOC_DEFINE(M_KDTRACE, "kdtrace", "DTrace hooks");
|
|
|
|
/* Hooks used in the machine-dependent trap handlers. */
|
|
dtrace_trap_func_t dtrace_trap_func;
|
|
dtrace_doubletrap_func_t dtrace_doubletrap_func;
|
|
dtrace_pid_probe_ptr_t dtrace_pid_probe_ptr;
|
|
dtrace_return_probe_ptr_t dtrace_return_probe_ptr;
|
|
|
|
systrace_probe_func_t systrace_probe_func;
|
|
|
|
/* Return the DTrace process data size compiled in the kernel hooks. */
|
|
size_t
|
|
kdtrace_proc_size()
|
|
{
|
|
|
|
return (KDTRACE_PROC_SIZE);
|
|
}
|
|
|
|
static void
|
|
kdtrace_proc_ctor(void *arg __unused, struct proc *p)
|
|
{
|
|
|
|
p->p_dtrace = malloc(KDTRACE_PROC_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
|
|
}
|
|
|
|
static void
|
|
kdtrace_proc_dtor(void *arg __unused, struct proc *p)
|
|
{
|
|
|
|
if (p->p_dtrace != NULL) {
|
|
free(p->p_dtrace, M_KDTRACE);
|
|
p->p_dtrace = NULL;
|
|
}
|
|
}
|
|
|
|
/* Return the DTrace thread data size compiled in the kernel hooks. */
|
|
size_t
|
|
kdtrace_thread_size()
|
|
{
|
|
|
|
return (KDTRACE_THREAD_SIZE);
|
|
}
|
|
|
|
static void
|
|
kdtrace_thread_ctor(void *arg __unused, struct thread *td)
|
|
{
|
|
|
|
td->td_dtrace = malloc(KDTRACE_THREAD_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
|
|
}
|
|
|
|
static void
|
|
kdtrace_thread_dtor(void *arg __unused, struct thread *td)
|
|
{
|
|
|
|
if (td->td_dtrace != NULL) {
|
|
free(td->td_dtrace, M_KDTRACE);
|
|
td->td_dtrace = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialise the kernel DTrace hooks.
|
|
*/
|
|
static void
|
|
init_dtrace(void *dummy __unused)
|
|
{
|
|
|
|
EVENTHANDLER_REGISTER(process_ctor, kdtrace_proc_ctor, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
EVENTHANDLER_REGISTER(process_dtor, kdtrace_proc_dtor, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
EVENTHANDLER_REGISTER(thread_ctor, kdtrace_thread_ctor, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
EVENTHANDLER_REGISTER(thread_dtor, kdtrace_thread_dtor, NULL,
|
|
EVENTHANDLER_PRI_ANY);
|
|
}
|
|
|
|
SYSINIT(kdtrace, SI_SUB_KDTRACE, SI_ORDER_FIRST, init_dtrace, NULL);
|