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  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)profile.h   8.1 (Berkeley) 6/11/93
   30  * $FreeBSD: src/sys/i386/include/profile.h,v 1.37.2.2 2005/01/31 23:26:04 imp Exp $
   31  */
   32 
   33 #ifndef _MACHINE_PROFILE_H_
   34 #define _MACHINE_PROFILE_H_
   35 
   36 #ifdef _KERNEL
   37 
   38 /*
   39  * Config generates something to tell the compiler to align functions on 16
   40  * byte boundaries.  A strict alignment is good for keeping the tables small.
   41  */
   42 #define FUNCTION_ALIGNMENT      16
   43 
   44 /*
   45  * The kernel uses assembler stubs instead of unportable inlines.
   46  * This is mainly to save a little time when profiling is not enabled,
   47  * which is the usual case for the kernel.
   48  */
   49 #define _MCOUNT_DECL void mcount
   50 #define MCOUNT
   51 
   52 #ifdef GUPROF
   53 #define MCOUNT_DECL(s)
   54 #define MCOUNT_ENTER(s)
   55 #define MCOUNT_EXIT(s)
   56 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
   57 #define MCOUNT_OVERHEAD(label)                                          \
   58         __asm __volatile("pushl %0; call __mcount; popl %%ecx"          \
   59                          :                                              \
   60                          : "i" (profil)                                 \
   61                          : "ax", "dx", "cx", "memory")
   62 #define MEXITCOUNT_OVERHEAD()                                           \
   63         __asm __volatile("call .mexitcount; 1:"                         \
   64                          : :                                            \
   65                          : "ax", "dx", "cx", "memory")
   66 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp)                            \
   67         __asm __volatile("movl $1b,%0" : "=rm" (labelp))
   68 #elif defined(lint)
   69 #define MCOUNT_OVERHEAD(label)
   70 #define MEXITCOUNT_OVERHEAD()
   71 #define MEXITCOUNT_OVERHEAD_GETLABEL()
   72 #else
   73 #error
   74 #endif /* !(__GNUC__ || __INTEL_COMPILER) */
   75 #else /* !GUPROF */
   76 #define MCOUNT_DECL(s)  u_long s;
   77 #ifdef SMP
   78 extern int      mcount_lock;
   79 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); \
   80                           while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
   81                                 /* nothing */ ; }
   82 #define MCOUNT_EXIT(s)  { atomic_store_rel_int(&mcount_lock, 0); \
   83                           write_eflags(s); }
   84 #else
   85 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); }
   86 #define MCOUNT_EXIT(s)  (write_eflags(s))
   87 #endif
   88 #endif /* GUPROF */
   89 
   90 void bintr(void);
   91 void btrap(void);
   92 void eintr(void);
   93 void user(void);
   94 
   95 #define MCOUNT_FROMPC_USER(pc)                                  \
   96         ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
   97 
   98 #define MCOUNT_FROMPC_INTR(pc)                                  \
   99         ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ?  \
  100             ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr :    \
  101                 (uintfptr_t)btrap) : ~0U)
  102 
  103 #else /* !_KERNEL */
  104 
  105 #define FUNCTION_ALIGNMENT      4
  106 
  107 #define _MCOUNT_DECL static __inline void _mcount
  108 
  109 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  110 #define MCOUNT                                                          \
  111 void                                                                    \
  112 mcount()                                                                \
  113 {                                                                       \
  114         uintfptr_t selfpc, frompc;                                      \
  115         /*                                                              \
  116          * Find the return address for mcount,                          \
  117          * and the return address for mcount's caller.                  \
  118          *                                                              \
  119          * selfpc = pc pushed by call to mcount                         \
  120          */                                                             \
  121         __asm("movl 4(%%ebp),%0" : "=r" (selfpc));                      \
  122         /*                                                              \
  123          * frompc = pc pushed by call to mcount's caller.               \
  124          * The caller's stack frame has already been built, so %ebp is  \
  125          * the caller's frame pointer.  The caller's raddr is in the    \
  126          * caller's frame following the caller's caller's frame pointer.\
  127          */                                                             \
  128         __asm("movl (%%ebp),%0" : "=r" (frompc));                       \
  129         frompc = ((uintfptr_t *)frompc)[1];                             \
  130         _mcount(frompc, selfpc);                                        \
  131 }
  132 #else /* !(__GNUC__ || __INTEL_COMPILER) */
  133 void                                                                    \
  134 #define MCOUNT                                                          \
  135 mcount()                                                                \
  136 {                                                                       \
  137 }
  138 #endif /* __GNUC__ || __INTEL_COMPILER */
  139 
  140 typedef u_int   uintfptr_t;
  141 
  142 #endif /* _KERNEL */
  143 
  144 /*
  145  * An unsigned integral type that can hold non-negative difference between
  146  * function pointers.
  147  */
  148 typedef u_int   fptrdiff_t;
  149 
  150 #ifdef _KERNEL
  151 
  152 void    mcount(uintfptr_t frompc, uintfptr_t selfpc);
  153 
  154 #else /* !_KERNEL */
  155 
  156 #include <sys/cdefs.h>
  157 
  158 __BEGIN_DECLS
  159 #if defined(__GNUC__) || defined(__INTEL_COMPILER)
  160 void    mcount(void) __asm(".mcount");
  161 #endif
  162 __END_DECLS
  163 
  164 #endif /* _KERNEL */
  165 
  166 #endif /* !_MACHINE_PROFILE_H_ */

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