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Annotation of sys/arch/i386/include/profile.h, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: profile.h,v 1.10 2005/01/07 02:03:17 pascoe Exp $     */
        !             2: /*     $NetBSD: profile.h,v 1.6 1995/03/28 18:17:08 jtc Exp $  */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1992, 1993
        !             6:  *     The Regents of the University of California.  All rights reserved.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. Neither the name of the University nor the names of its contributors
        !            17:  *    may be used to endorse or promote products derived from this software
        !            18:  *    without specific prior written permission.
        !            19:  *
        !            20:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            30:  * SUCH DAMAGE.
        !            31:  *
        !            32:  *     @(#)profile.h   8.1 (Berkeley) 6/11/93
        !            33:  */
        !            34:
        !            35: #define        _MCOUNT_DECL static __inline void _mcount
        !            36:
        !            37: #define        MCOUNT \
        !            38: extern void mcount(void) __asm("__mcount");                            \
        !            39: __weak_alias(mcount,__mcount);                                         \
        !            40: void                                                                   \
        !            41: mcount()                                                               \
        !            42: {                                                                      \
        !            43:        int selfpc, frompcindex;                                        \
        !            44:        /*                                                              \
        !            45:         * find the return address for mcount,                          \
        !            46:         * and the return address for mcount's caller.                  \
        !            47:         *                                                              \
        !            48:         * selfpc = pc pushed by mcount call                            \
        !            49:         */                                                             \
        !            50:        __asm __volatile ("movl 4(%%ebp),%0" : "=r" (selfpc));          \
        !            51:        /*                                                              \
        !            52:         * frompcindex = pc pushed by call into self.                   \
        !            53:         */                                                             \
        !            54:        __asm __volatile ("movl (%%ebp),%0;movl 4(%0),%0" :             \
        !            55:            "+r" (frompcindex));                                        \
        !            56:        _mcount(frompcindex, selfpc);                                   \
        !            57: }
        !            58:
        !            59: #ifdef _KERNEL
        !            60: /*
        !            61:  * We inline the code that splhigh and splx would do here as otherwise we would
        !            62:  * call recursively into mcount() as machdep.c is compiled with -pg on a
        !            63:  * profiling build.
        !            64:  */
        !            65: #define        MCOUNT_ENTER    _SPLRAISE(s, IPL_HIGH); __splbarrier()
        !            66: #define        MCOUNT_EXIT     __splbarrier(); _SPLX(s)
        !            67: #endif /* _KERNEL */