2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1999 Eivind Eklund <eivind@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #ifndef _SYS_KASSERT_H_
32 #define _SYS_KASSERT_H_
34 #include <sys/cdefs.h>
37 extern const char *panicstr; /* panic message */
39 #define KERNEL_PANICKED() __predict_false(panicked)
41 #ifdef INVARIANTS /* The option is always available */
42 #define VNASSERT(exp, vp, msg) do { \
43 if (__predict_false(!(exp))) { \
44 vn_printf(vp, "VNASSERT failed: %s not true at %s:%d (%s)\n",\
45 #exp, __FILE__, __LINE__, __func__); \
49 #define VNPASS(exp, vp) do { \
50 const char *_exp = #exp; \
51 VNASSERT(exp, vp, ("condition %s not met at %s:%d (%s)", \
52 _exp, __FILE__, __LINE__, __func__)); \
54 #define __assert_unreachable() \
55 panic("executing segment marked as unreachable at %s:%d (%s)\n", \
56 __FILE__, __LINE__, __func__)
57 #else /* INVARIANTS */
58 #define VNASSERT(exp, vp, msg) do { \
60 #define VNPASS(exp, vp) do { \
62 #define __assert_unreachable() __unreachable()
63 #endif /* INVARIANTS */
65 #ifndef CTASSERT /* Allow lint to override */
66 #define CTASSERT(x) _Static_assert(x, "compile-time assertion failed")
70 * These functions need to be declared before the KASSERT macro is invoked in
71 * !KASSERT_PANIC_OPTIONAL builds, so their declarations are sort of out of
72 * place compared to other function definitions in this header. On the other
73 * hand, this header is a bit disorganized anyway.
75 void panic(const char *, ...) __dead2 __printflike(1, 2);
76 void vpanic(const char *, __va_list) __dead2 __printflike(1, 0);
79 #if defined(_STANDALONE)
81 * Until we have more experience with KASSERTS that are called
82 * from the boot loader, they are off. The bootloader does this
83 * a little differently than the kernel (we just call printf atm).
84 * we avoid most of the common functions in the boot loader, so
85 * declare printf() here too.
87 int printf(const char *, ...) __printflike(1, 2);
88 # define kassert_panic printf
89 #else /* !_STANDALONE */
90 # if defined(WITNESS) || defined(INVARIANT_SUPPORT)
91 # ifdef KASSERT_PANIC_OPTIONAL
92 void kassert_panic(const char *fmt, ...) __printflike(1, 2);
94 # define kassert_panic panic
95 # endif /* KASSERT_PANIC_OPTIONAL */
96 # endif /* defined(WITNESS) || defined(INVARIANT_SUPPORT) */
97 #endif /* _STANDALONE */
99 #if (defined(_KERNEL) && defined(INVARIANTS)) || defined(_STANDALONE)
100 #define KASSERT(exp,msg) do { \
101 if (__predict_false(!(exp))) \
104 #else /* !(KERNEL && INVARIANTS) && !_STANDALONE */
105 #define KASSERT(exp,msg) do { \
107 #endif /* (_KERNEL && INVARIANTS) || _STANDALONE */
111 * Helpful macros for quickly coming up with assertions with informative
114 #define MPASS(ex) MPASS4(ex, #ex, __FILE__, __LINE__)
115 #define MPASS2(ex, what) MPASS4(ex, what, __FILE__, __LINE__)
116 #define MPASS3(ex, file, line) MPASS4(ex, #ex, file, line)
117 #define MPASS4(ex, what, file, line) \
118 KASSERT((ex), ("Assertion %s failed at %s:%d", what, file, line))
121 * Assert that a pointer can be loaded from memory atomically.
123 * This assertion enforces stronger alignment than necessary. For example,
124 * on some architectures, atomicity for unaligned loads will depend on
125 * whether or not the load spans multiple cache lines.
127 #define ASSERT_ATOMIC_LOAD_PTR(var, msg) \
128 KASSERT(sizeof(var) == sizeof(void *) && \
129 ((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
131 * Assert that a thread is in critical(9) section.
133 #define CRITICAL_ASSERT(td) \
134 KASSERT((td)->td_critnest >= 1, ("Not in critical section"))
137 * If we have already panic'd and this is the thread that called
138 * panic(), then don't block on any mutexes but silently succeed.
139 * Otherwise, the kernel will deadlock since the scheduler isn't
140 * going to run the thread that holds any lock we need.
142 #define SCHEDULER_STOPPED_TD(td) ({ \
143 MPASS((td) == curthread); \
144 __predict_false((td)->td_stopsched); \
146 #define SCHEDULER_STOPPED() SCHEDULER_STOPPED_TD(curthread)
149 #endif /* _SYS_KASSERT_H_ */