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54d34bfbdf
It contains assert-related definitions previously provided by
sys/systm.h. The new header is leaner than whole systm.h.
Include kassert.h from systm.h for compatibility.
The copyright assignment to Eivind Eklund was suggested by Kirk McKusick
and is based in the commit 5526d2d920.
Suggested by: jhb
Reviewed by: alc, imp, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D34089
149 lines
5.6 KiB
C
149 lines
5.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1999 Eivind Eklund <eivind@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SYS_KASSERT_H_
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#define _SYS_KASSERT_H_
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#include <sys/cdefs.h>
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#ifdef _KERNEL
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extern const char *panicstr; /* panic message */
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extern bool panicked;
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#define KERNEL_PANICKED() __predict_false(panicked)
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#ifdef INVARIANTS /* The option is always available */
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#define VNASSERT(exp, vp, msg) do { \
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if (__predict_false(!(exp))) { \
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vn_printf(vp, "VNASSERT failed: %s not true at %s:%d (%s)\n",\
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#exp, __FILE__, __LINE__, __func__); \
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kassert_panic msg; \
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} \
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} while (0)
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#define VNPASS(exp, vp) do { \
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const char *_exp = #exp; \
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VNASSERT(exp, vp, ("condition %s not met at %s:%d (%s)", \
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_exp, __FILE__, __LINE__, __func__)); \
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} while (0)
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#define __assert_unreachable() \
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panic("executing segment marked as unreachable at %s:%d (%s)\n", \
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__FILE__, __LINE__, __func__)
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#else /* INVARIANTS */
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#define VNASSERT(exp, vp, msg) do { \
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} while (0)
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#define VNPASS(exp, vp) do { \
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} while (0)
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#define __assert_unreachable() __unreachable()
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#endif /* INVARIANTS */
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#ifndef CTASSERT /* Allow lint to override */
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#define CTASSERT(x) _Static_assert(x, "compile-time assertion failed")
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#endif
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/*
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* These functions need to be declared before the KASSERT macro is invoked in
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* !KASSERT_PANIC_OPTIONAL builds, so their declarations are sort of out of
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* place compared to other function definitions in this header. On the other
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* hand, this header is a bit disorganized anyway.
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*/
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void panic(const char *, ...) __dead2 __printflike(1, 2);
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void vpanic(const char *, __va_list) __dead2 __printflike(1, 0);
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#endif /* _KERNEL */
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#if defined(_STANDALONE)
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/*
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* Until we have more experience with KASSERTS that are called
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* from the boot loader, they are off. The bootloader does this
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* a little differently than the kernel (we just call printf atm).
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* we avoid most of the common functions in the boot loader, so
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* declare printf() here too.
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*/
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int printf(const char *, ...) __printflike(1, 2);
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# define kassert_panic printf
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#else /* !_STANDALONE */
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# if defined(WITNESS) || defined(INVARIANT_SUPPORT)
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# ifdef KASSERT_PANIC_OPTIONAL
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void kassert_panic(const char *fmt, ...) __printflike(1, 2);
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# else
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# define kassert_panic panic
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# endif /* KASSERT_PANIC_OPTIONAL */
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# endif /* defined(WITNESS) || defined(INVARIANT_SUPPORT) */
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#endif /* _STANDALONE */
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#if (defined(_KERNEL) && defined(INVARIANTS)) || defined(_STANDALONE)
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#define KASSERT(exp,msg) do { \
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if (__predict_false(!(exp))) \
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kassert_panic msg; \
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} while (0)
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#else /* !(KERNEL && INVARIANTS) && !_STANDALONE */
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#define KASSERT(exp,msg) do { \
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} while (0)
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#endif /* (_KERNEL && INVARIANTS) || _STANDALONE */
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#ifdef _KERNEL
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/*
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* Helpful macros for quickly coming up with assertions with informative
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* panic messages.
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*/
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#define MPASS(ex) MPASS4(ex, #ex, __FILE__, __LINE__)
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#define MPASS2(ex, what) MPASS4(ex, what, __FILE__, __LINE__)
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#define MPASS3(ex, file, line) MPASS4(ex, #ex, file, line)
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#define MPASS4(ex, what, file, line) \
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KASSERT((ex), ("Assertion %s failed at %s:%d", what, file, line))
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/*
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* Assert that a pointer can be loaded from memory atomically.
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*
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* This assertion enforces stronger alignment than necessary. For example,
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* on some architectures, atomicity for unaligned loads will depend on
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* whether or not the load spans multiple cache lines.
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*/
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#define ASSERT_ATOMIC_LOAD_PTR(var, msg) \
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KASSERT(sizeof(var) == sizeof(void *) && \
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((uintptr_t)&(var) & (sizeof(void *) - 1)) == 0, msg)
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/*
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* Assert that a thread is in critical(9) section.
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*/
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#define CRITICAL_ASSERT(td) \
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KASSERT((td)->td_critnest >= 1, ("Not in critical section"))
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/*
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* If we have already panic'd and this is the thread that called
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* panic(), then don't block on any mutexes but silently succeed.
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* Otherwise, the kernel will deadlock since the scheduler isn't
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* going to run the thread that holds any lock we need.
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*/
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#define SCHEDULER_STOPPED_TD(td) ({ \
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MPASS((td) == curthread); \
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__predict_false((td)->td_stopsched); \
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})
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#define SCHEDULER_STOPPED() SCHEDULER_STOPPED_TD(curthread)
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#endif /* _KERNEL */
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#endif /* _SYS_KASSERT_H_ */
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