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Annotation of sys/arch/i386/include/profile.h, Revision 1.1.1.1

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 */