2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2007-2008 John Birrell <jb@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/eventhandler.h>
38 #include <sys/kernel.h>
39 #include <sys/malloc.h>
41 #include <sys/dtrace_bsd.h>
42 #include <sys/sysctl.h>
43 #include <sys/sysent.h>
45 #define KDTRACE_PROC_SIZE 64
46 #define KDTRACE_THREAD_SIZE 256
48 FEATURE(kdtrace_hooks,
49 "Kernel DTrace hooks which are required to load DTrace kernel modules");
51 static MALLOC_DEFINE(M_KDTRACE, "kdtrace", "DTrace hooks");
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;
59 bool __read_frequently systrace_enabled;
60 systrace_probe_func_t systrace_probe_func;
62 /* Return the DTrace process data size compiled in the kernel hooks. */
67 return (KDTRACE_PROC_SIZE);
71 kdtrace_proc_ctor(struct proc *p)
74 p->p_dtrace = malloc(KDTRACE_PROC_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
78 kdtrace_proc_dtor(struct proc *p)
81 free(p->p_dtrace, M_KDTRACE);
85 /* Return the DTrace thread data size compiled in the kernel hooks. */
90 return (KDTRACE_THREAD_SIZE);
94 kdtrace_thread_ctor(struct thread *td)
97 td->td_dtrace = malloc(KDTRACE_THREAD_SIZE, M_KDTRACE, M_WAITOK|M_ZERO);
101 kdtrace_thread_dtor(struct thread *td)
104 free(td->td_dtrace, M_KDTRACE);
105 td->td_dtrace = NULL;