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  * Copyright (c) 1992, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      @(#)profile.h   8.1 (Berkeley) 6/11/93
   34  * $FreeBSD: releng/5.0/sys/i386/include/profile.h 103965 2002-09-25 13:46:23Z markm $
   35  */
   36 
   37 #ifndef _MACHINE_PROFILE_H_
   38 #define _MACHINE_PROFILE_H_
   39 
   40 #ifdef _KERNEL
   41 
   42 /*
   43  * Config generates something to tell the compiler to align functions on 16
   44  * byte boundaries.  A strict alignment is good for keeping the tables small.
   45  */
   46 #define FUNCTION_ALIGNMENT      16
   47 
   48 /*
   49  * The kernel uses assembler stubs instead of unportable inlines.
   50  * This is mainly to save a little time when profiling is not enabled,
   51  * which is the usual case for the kernel.
   52  */
   53 #define _MCOUNT_DECL void mcount
   54 #define MCOUNT
   55 
   56 #ifdef GUPROF
   57 #define CALIB_SCALE     1000
   58 #define KCOUNT(p,index) ((p)->kcount[(index) \
   59                          / (HISTFRACTION * sizeof(HISTCOUNTER))])
   60 #define MCOUNT_DECL(s)
   61 #define MCOUNT_ENTER(s)
   62 #define MCOUNT_EXIT(s)
   63 #define PC_TO_I(p, pc)  ((uintfptr_t)(pc) - (uintfptr_t)(p)->lowpc)
   64 #else
   65 #define MCOUNT_DECL(s)  u_long s;
   66 #ifdef SMP
   67 extern int      mcount_lock;
   68 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); \
   69                           while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
   70                                 /* nothing */ ; }
   71 #define MCOUNT_EXIT(s)  { atomic_store_rel_int(&mcount_lock, 0); \
   72                           write_eflags(s); }
   73 #else
   74 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); }
   75 #define MCOUNT_EXIT(s)  (write_eflags(s))
   76 #endif
   77 #endif /* GUPROF */
   78 
   79 #else /* !_KERNEL */
   80 
   81 #define FUNCTION_ALIGNMENT      4
   82 
   83 #define _MCOUNT_DECL static __inline void _mcount
   84 
   85 #ifdef  __GNUC__
   86 #define MCOUNT                                                          \
   87 void                                                                    \
   88 mcount()                                                                \
   89 {                                                                       \
   90         uintfptr_t selfpc, frompc;                                      \
   91         /*                                                              \
   92          * Find the return address for mcount,                          \
   93          * and the return address for mcount's caller.                  \
   94          *                                                              \
   95          * selfpc = pc pushed by call to mcount                         \
   96          */                                                             \
   97         asm("movl 4(%%ebp),%0" : "=r" (selfpc));                        \
   98         /*                                                              \
   99          * frompc = pc pushed by call to mcount's caller.               \
  100          * The caller's stack frame has already been built, so %ebp is  \
  101          * the caller's frame pointer.  The caller's raddr is in the    \
  102          * caller's frame following the caller's caller's frame pointer.\
  103          */                                                             \
  104         asm("movl (%%ebp),%0" : "=r" (frompc));                         \
  105         frompc = ((uintfptr_t *)frompc)[1];                             \
  106         _mcount(frompc, selfpc);                                        \
  107 }
  108 #else   /* __GNUC__ */
  109 #define MCOUNT          \
  110 void                    \
  111 mcount()                \
  112 {                       \
  113 }
  114 #endif  /* __GNUC__ */
  115 
  116 typedef unsigned int    uintfptr_t;
  117 
  118 #endif /* _KERNEL */
  119 
  120 /*
  121  * An unsigned integral type that can hold non-negative difference between
  122  * function pointers.
  123  */
  124 typedef u_int   fptrdiff_t;
  125 
  126 #ifdef _KERNEL
  127 
  128 void    mcount(uintfptr_t frompc, uintfptr_t selfpc);
  129 void    kmupetext(uintfptr_t nhighpc);
  130 
  131 #ifdef GUPROF
  132 struct gmonparam;
  133 
  134 void    nullfunc_loop_profiled(void);
  135 void    nullfunc_profiled(void);
  136 void    startguprof(struct gmonparam *p);
  137 void    stopguprof(struct gmonparam *p);
  138 #else
  139 #define startguprof(p)
  140 #define stopguprof(p)
  141 #endif /* GUPROF */
  142 
  143 #else /* !_KERNEL */
  144 
  145 #include <sys/cdefs.h>
  146 
  147 __BEGIN_DECLS
  148 #ifdef __GNUC__
  149 void    mcount(void) __asm(".mcount");
  150 #endif
  151 static void     _mcount(uintfptr_t frompc, uintfptr_t selfpc);
  152 __END_DECLS
  153 
  154 #endif /* _KERNEL */
  155 
  156 #ifdef GUPROF
  157 /* XXX doesn't quite work outside kernel yet. */
  158 extern int      cputime_bias;
  159 
  160 __BEGIN_DECLS
  161 int     cputime(void);
  162 void    empty_loop(void);
  163 void    mexitcount(uintfptr_t selfpc);
  164 void    nullfunc(void);
  165 void    nullfunc_loop(void);
  166 __END_DECLS
  167 #endif
  168 
  169 #endif /* !_MACHINE_PROFILE_H_ */

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