FreeBSD/Linux Kernel Cross Reference
sys/i386/include/profile.h

     /*
      * Copyright (c) 1992, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. 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 REGENTS 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.
     *
     *      @(#)profile.h   8.1 (Berkeley) 6/11/93
     * $FreeBSD: src/sys/i386/include/profile.h,v 1.8.2.2 1999/09/05 08:11:59 peter Exp $
     */
    
    #ifndef _MACHINE_PROFILE_H_
    #define _MACHINE_PROFILE_H_
    
    #ifdef KERNEL
    /*
     * Config generates something to tell the compiler to align functions on 16
     * byte boundaries.  A strict alignment is good for keeping the tables small.
     */
    #define FUNCTION_ALIGNMENT      16
    
    /*
     * The kernel uses assembler stubs instead of unportable inlines.
     * This is mainly to save a little time when profiling is not enabled,
     * which is the usual case for the kernel.
     */
    #define _MCOUNT_DECL void mcount
    #define MCOUNT
    
    #ifdef GUPROF
    #define CALIB_SCALE     1000
    #define KCOUNT(p,index) ((p)->kcount[(index) \
                             / (HISTFRACTION * sizeof(HISTCOUNTER))])
    #define MCOUNT_DECL(s)
    #define MCOUNT_ENTER(s)
    #define MCOUNT_EXIT(s)
    #define PC_TO_I(p, pc)  ((fptrint_t)(pc) - (fptrint_t)(p)->lowpc)
    #else
    #define MCOUNT_DECL(s)  u_long s;
    #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); }
    #define MCOUNT_EXIT(s)  (write_eflags(s))
    #endif /* GUPROF */
    
    #else /* !KERNEL */
    
    #define FUNCTION_ALIGNMENT      4
    
    #define _MCOUNT_DECL static __inline void _mcount
    
    #define MCOUNT \
    void \
    mcount() \
    { \
            fptrint_t selfpc, frompc; \
            /* \
             * Find the return address for mcount, \
             * and the return address for mcount's caller. \
             * \
             * selfpc = pc pushed by call to mcount \
             */ \
            asm("movl 4(%%ebp),%0" : "=r" (selfpc)); \
            /* \
             * frompc = pc pushed by call to mcount's caller. \
             * The caller's stack frame has already been built, so %ebp is \
             * the caller's frame pointer.  The caller's raddr is in the \
             * caller's frame following the caller's caller's frame pointer. \
             */ \
            asm("movl (%%ebp),%0" : "=r" (frompc)); \
            frompc = ((fptrint_t *)frompc)[1]; \
            _mcount(frompc, selfpc); \
    }
    #endif /* KERNEL */
    
    /* An unsigned integral type that can hold function pointers. */
   typedef u_int   fptrint_t;
   
   /*
    * An unsigned integral type that can hold non-negative difference between
    * function pointers.
    */
   typedef int     fptrdiff_t;
   
   #ifdef KERNEL
   
   void    mcount __P((fptrint_t frompc, fptrint_t selfpc));
   
   #ifdef GUPROF
   struct gmonparam;
   
   void    nullfunc_loop_profiled __P((void));
   void    nullfunc_profiled __P((void));
   void    startguprof __P((struct gmonparam *p));
   void    stopguprof __P((struct gmonparam *p));
   #else
   #define startguprof(p)
   #define stopguprof(p)
   #endif /* GUPROF */
   
   #else /* !KERNEL */
   
   #include <sys/cdefs.h>
   
   __BEGIN_DECLS
   void    mcount __P((void)) __asm("mcount");
   static void     _mcount __P((fptrint_t frompc, fptrint_t selfpc));
   __END_DECLS
   
   #endif /* KERNEL */
   
   #ifdef GUPROF
   /* XXX doesn't quite work outside kernel yet. */
   extern int      cputime_bias;
   
   __BEGIN_DECLS
   int     cputime __P((void));
   void    empty_loop __P((void));
   void    mexitcount __P((fptrint_t selfpc));
   void    nullfunc __P((void));
   void    nullfunc_loop __P((void));
   __END_DECLS
   #endif
   
   #endif /* !_MACHINE_PROFILE_H_ */

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