25142c5ea1
mcount spin mutex with a very simple non-recursive spinlock implemented using atomic operations.
164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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 REGENTS 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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* @(#)profile.h 8.1 (Berkeley) 6/11/93
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PROFILE_H_
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#define _MACHINE_PROFILE_H_
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#ifdef _KERNEL
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/*
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* Config generates something to tell the compiler to align functions on 16
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* byte boundaries. A strict alignment is good for keeping the tables small.
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*/
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#define FUNCTION_ALIGNMENT 16
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/*
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* The kernel uses assembler stubs instead of unportable inlines.
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* This is mainly to save a little time when profiling is not enabled,
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* which is the usual case for the kernel.
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*/
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#define _MCOUNT_DECL void mcount
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#define MCOUNT
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#ifdef GUPROF
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#define CALIB_SCALE 1000
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#define KCOUNT(p,index) ((p)->kcount[(index) \
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/ (HISTFRACTION * sizeof(HISTCOUNTER))])
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#define MCOUNT_DECL(s)
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#define MCOUNT_ENTER(s)
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#define MCOUNT_EXIT(s)
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#define PC_TO_I(p, pc) ((uintfptr_t)(pc) - (uintfptr_t)(p)->lowpc)
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#else
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#define MCOUNT_DECL(s) u_long s;
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#ifdef SMP
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#define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); \
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while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1) \
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/* nothing */ ; }
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#define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
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write_eflags(s); }
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#else
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#define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); }
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#define MCOUNT_EXIT(s) (write_eflags(s))
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#endif
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#endif /* GUPROF */
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#else /* !_KERNEL */
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#define FUNCTION_ALIGNMENT 4
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#define _MCOUNT_DECL static __inline void _mcount
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#define MCOUNT \
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void \
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mcount() \
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{ \
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uintfptr_t selfpc, frompc; \
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/* \
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* Find the return address for mcount, \
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* and the return address for mcount's caller. \
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* \
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* selfpc = pc pushed by call to mcount \
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*/ \
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asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
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/* \
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* frompc = pc pushed by call to mcount's caller. \
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* The caller's stack frame has already been built, so %ebp is \
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* the caller's frame pointer. The caller's raddr is in the \
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* caller's frame following the caller's caller's frame pointer. \
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*/ \
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asm("movl (%%ebp),%0" : "=r" (frompc)); \
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frompc = ((uintfptr_t *)frompc)[1]; \
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_mcount(frompc, selfpc); \
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}
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typedef unsigned int uintfptr_t;
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#endif /* _KERNEL */
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/*
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* An unsigned integral type that can hold non-negative difference between
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* function pointers.
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*/
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typedef u_int fptrdiff_t;
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#ifdef _KERNEL
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void mcount __P((uintfptr_t frompc, uintfptr_t selfpc));
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#ifdef GUPROF
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struct gmonparam;
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void nullfunc_loop_profiled __P((void));
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void nullfunc_profiled __P((void));
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void startguprof __P((struct gmonparam *p));
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void stopguprof __P((struct gmonparam *p));
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#else
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#define startguprof(p)
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#define stopguprof(p)
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#endif /* GUPROF */
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#else /* !_KERNEL */
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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#ifdef __GNUC__
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#ifdef __ELF__
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void mcount __P((void)) __asm(".mcount");
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#else
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void mcount __P((void)) __asm("mcount");
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#endif
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#endif
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static void _mcount __P((uintfptr_t frompc, uintfptr_t selfpc));
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__END_DECLS
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#endif /* _KERNEL */
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#ifdef GUPROF
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/* XXX doesn't quite work outside kernel yet. */
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extern int cputime_bias;
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__BEGIN_DECLS
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int cputime __P((void));
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void empty_loop __P((void));
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void mexitcount __P((uintfptr_t selfpc));
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void nullfunc __P((void));
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void nullfunc_loop __P((void));
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__END_DECLS
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#endif
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#endif /* !_MACHINE_PROFILE_H_ */
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