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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1999 Eivind Eklund <eivind@FreeBSD.org>
*
* 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.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 REGENTS 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.
*/
#ifndef _SYS_KASSERT_H_
#define _SYS_KASSERT_H_
#include <sys/cdefs.h>
#ifdef _KERNEL
extern const char *panicstr; /* panic message */
extern bool panicked;
#define KERNEL_PANICKED() __predict_false(panicked)
#ifdef INVARIANTS /* The option is always available */
#define VNASSERT(exp, vp, msg) do { \
if (__predict_false(!(exp))) { \
vn_printf(vp, "VNASSERT failed: %s not true at %s:%d (%s)\n",\
#exp, __FILE__, __LINE__, __func__); \
kassert_panic msg; \
} \
} while (0)
#define VNPASS(exp, vp) do { \
const char *_exp = #exp; \
VNASSERT(exp, vp, ("condition %s not met at %s:%d (%s)", \
_exp, __FILE__, __LINE__, __func__)); \
} while (0)
#define __assert_unreachable() \
panic("executing segment marked as unreachable at %s:%d (%s)\n", \
__FILE__, __LINE__, __func__)
#else /* INVARIANTS */
#define VNASSERT(exp, vp, msg) do { \
} while (0)
#define VNPASS(exp, vp) do { \
} while (0)
#define __assert_unreachable() __unreachable()
#endif /* INVARIANTS */
#ifndef CTASSERT /* Allow lint to override */
#define CTASSERT(x) _Static_assert(x, "compile-time assertion failed")
#endif
/*
* These functions need to be declared before the KASSERT macro is invoked in
* !KASSERT_PANIC_OPTIONAL builds, so their declarations are sort of out of
* place compared to other function definitions in this header. On the other
* hand, this header is a bit disorganized anyway.
*/
void panic(const char *, ...) __dead2 __printflike(1, 2);
void vpanic(const char *, __va_list) __dead2 __printflike(1, 0);
#endif /* _KERNEL */
#if defined(_STANDALONE)
/*
* Until we have more experience with KASSERTS that are called
* from the boot loader, they are off. The bootloader does this
* a little differently than the kernel (we just call printf atm).
* we avoid most of the common functions in the boot loader, so
* declare printf() here too.
*/
int printf(const char *, ...) __printflike(1, 2);
# define kassert_panic printf
#else /* !_STANDALONE */
# if defined(WITNESS) || defined(INVARIANT_SUPPORT)
# ifdef KASSERT_PANIC_OPTIONAL
void kassert_panic(const char *fmt, ...) __printflike(1, 2);
# else
# define kassert_panic panic
# endif /* KASSERT_PANIC_OPTIONAL */
# endif /* defined(WITNESS) || defined(INVARIANT_SUPPORT) */
#endif /* _STANDALONE */
#if (defined(_KERNEL) && defined(INVARIANTS)) || defined(_STANDALONE)
#define KASSERT(exp,msg) do { \
if (__predict_false(!(exp))) \
kassert_panic msg; \
} while (0)
#else /* !(KERNEL && INVARIANTS) && !_STANDALONE */
#define KASSERT(exp,msg) do { \
} while (0)
#endif /* (_KERNEL && INVARIANTS) || _STANDALONE */
#ifdef _KERNEL
/*
* Helpful macros for quickly coming up with assertions with informative
* panic messages.
*/
#define MPASS(ex) MPASS4(ex, #ex, __FILE__, __LINE__)
#define MPASS2(ex, what) MPASS4(ex, what, __FILE__, __LINE__)
#define MPASS3(ex, file, line) MPASS4(ex, #ex, file, line)
#define MPASS4(ex, what, file, line) \
KASSERT((ex), ("Assertion %s failed at %s:%d", what, file, line))
/*
* Assert that a pointer can be loaded from memory atomically.
*
* This assertion enforces stronger alignment than necessary. For example,
* on some architectures, atomicity for unaligned loads will depend on
* whether or not the load spans multiple cache lines.
*/
#define ASSERT_ATOMIC_LOAD_PTR(var, msg) \
KASSERT(sizeof(var) == sizeof(void *) && \
((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
/*
* Assert that a thread is in critical(9) section.
*/
#define CRITICAL_ASSERT(td) \
KASSERT((td)->td_critnest >= 1, ("Not in critical section"))
/*
* If we have already panic'd and this is the thread that called
* panic(), then don't block on any mutexes but silently succeed.
* Otherwise, the kernel will deadlock since the scheduler isn't
* going to run the thread that holds any lock we need.
*/
#define SCHEDULER_STOPPED_TD(td) ({ \
MPASS((td) == curthread); \
__predict_false((td)->td_stopsched); \
})
#define SCHEDULER_STOPPED() SCHEDULER_STOPPED_TD(curthread)
#endif /* _KERNEL */
#endif /* _SYS_KASSERT_H_ */
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