The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1992, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)profile.h   8.1 (Berkeley) 6/11/93
   32  * $FreeBSD$
   33  */
   34 
   35 #ifndef _MACHINE_PROFILE_H_
   36 #define _MACHINE_PROFILE_H_
   37 
   38 #ifndef _KERNEL
   39 
   40 #include <sys/cdefs.h>
   41 
   42 #define FUNCTION_ALIGNMENT      4
   43 
   44 #define _MCOUNT_DECL static __inline void _mcount
   45 
   46 #define MCOUNT                                                          \
   47 void                                                                    \
   48 mcount()                                                                \
   49 {                                                                       \
   50         uintfptr_t selfpc, frompc, ecx;                                 \
   51         /*                                                              \
   52          * In gcc 4.2, ecx might be used in the caller as the arg       \
   53          * pointer if the stack realignment option is set (-mstackrealign) \
   54          * or if the caller has the force_align_arg_pointer attribute   \
   55          * (stack realignment is ALWAYS on for main).  Preserve ecx     \
   56          * here.                                                        \
   57          */                                                             \
   58         __asm("" : "=c" (ecx));                                         \
   59         /*                                                              \
   60          * Find the return address for mcount,                          \
   61          * and the return address for mcount's caller.                  \
   62          *                                                              \
   63          * selfpc = pc pushed by call to mcount                         \
   64          */                                                             \
   65         __asm("movl 4(%%ebp),%0" : "=r" (selfpc));                      \
   66         /*                                                              \
   67          * frompc = pc pushed by call to mcount's caller.               \
   68          * The caller's stack frame has already been built, so %ebp is  \
   69          * the caller's frame pointer.  The caller's raddr is in the    \
   70          * caller's frame following the caller's caller's frame pointer.\
   71          */                                                             \
   72         __asm("movl (%%ebp),%0" : "=r" (frompc));                       \
   73         frompc = ((uintfptr_t *)frompc)[1];                             \
   74         _mcount(frompc, selfpc);                                        \
   75         __asm("" : : "c" (ecx));                                        \
   76 }
   77 
   78 typedef u_int   uintfptr_t;
   79 
   80 /*
   81  * An unsigned integral type that can hold non-negative difference between
   82  * function pointers.
   83  */
   84 typedef u_int   fptrdiff_t;
   85 
   86 __BEGIN_DECLS
   87 void    mcount(void) __asm(".mcount");
   88 __END_DECLS
   89 
   90 #endif /* !_KERNEL */
   91 
   92 #endif /* !_MACHINE_PROFILE_H_ */

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