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  * $FreeBSD$
   31  */
   32 
   33 #ifndef _MACHINE_PROFILE_H_
   34 #define _MACHINE_PROFILE_H_
   35 
   36 #ifndef _SYS_CDEFS_H_
   37 #error this file needs sys/cdefs.h as a prerequisite
   38 #endif
   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 MCOUNT_DECL(s)
   58 #define MCOUNT_ENTER(s)
   59 #define MCOUNT_EXIT(s)
   60 #ifdef __GNUCLIKE_ASM
   61 #define MCOUNT_OVERHEAD(label)                                          \
   62         __asm __volatile("pushl %0; call __mcount; popl %%ecx"          \
   63                          :                                              \
   64                          : "i" (profil)                                 \
   65                          : "ax", "dx", "cx", "memory")
   66 #define MEXITCOUNT_OVERHEAD()                                           \
   67         __asm __volatile("call .mexitcount; 1:"                         \
   68                          : :                                            \
   69                          : "ax", "dx", "cx", "memory")
   70 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp)                            \
   71         __asm __volatile("movl $1b,%0" : "=rm" (labelp))
   72 #elif defined(lint)
   73 #define MCOUNT_OVERHEAD(label)
   74 #define MEXITCOUNT_OVERHEAD()
   75 #define MEXITCOUNT_OVERHEAD_GETLABEL()
   76 #else
   77 #error
   78 #endif /* !__GNUCLIKE_ASM */
   79 #else /* !GUPROF */
   80 #define MCOUNT_DECL(s)  u_long s;
   81 #ifdef SMP
   82 extern int      mcount_lock;
   83 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); \
   84                           while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
   85                                 /* nothing */ ; }
   86 #define MCOUNT_EXIT(s)  { atomic_store_rel_int(&mcount_lock, 0); \
   87                           write_eflags(s); }
   88 #else
   89 #define MCOUNT_ENTER(s) { s = read_eflags(); disable_intr(); }
   90 #define MCOUNT_EXIT(s)  (write_eflags(s))
   91 #endif
   92 #endif /* GUPROF */
   93 
   94 void bintr(void);
   95 void btrap(void);
   96 void eintr(void);
   97 void user(void);
   98 
   99 #define MCOUNT_FROMPC_USER(pc)                                  \
  100         ((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
  101 
  102 #define MCOUNT_FROMPC_INTR(pc)                                  \
  103         ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ?  \
  104             ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr :    \
  105                 (uintfptr_t)btrap) : ~0U)
  106 
  107 #else /* !_KERNEL */
  108 
  109 #define FUNCTION_ALIGNMENT      4
  110 
  111 #define _MCOUNT_DECL static __inline void _mcount
  112 
  113 #ifdef __GNUCLIKE_ASM
  114 #define MCOUNT                                                          \
  115 void                                                                    \
  116 mcount()                                                                \
  117 {                                                                       \
  118         uintfptr_t selfpc, frompc;                                      \
  119         /*                                                              \
  120          * Find the return address for mcount,                          \
  121          * and the return address for mcount's caller.                  \
  122          *                                                              \
  123          * selfpc = pc pushed by call to mcount                         \
  124          */                                                             \
  125         __asm("movl 4(%%ebp),%0" : "=r" (selfpc));                      \
  126         /*                                                              \
  127          * frompc = pc pushed by call to mcount's caller.               \
  128          * The caller's stack frame has already been built, so %ebp is  \
  129          * the caller's frame pointer.  The caller's raddr is in the    \
  130          * caller's frame following the caller's caller's frame pointer.\
  131          */                                                             \
  132         __asm("movl (%%ebp),%0" : "=r" (frompc));                       \
  133         frompc = ((uintfptr_t *)frompc)[1];                             \
  134         _mcount(frompc, selfpc);                                        \
  135 }
  136 #else /* !__GNUCLIKE_ASM */
  137 void                                                                    \
  138 #define MCOUNT                                                          \
  139 mcount()                                                                \
  140 {                                                                       \
  141 }
  142 #endif /* __GNUCLIKE_ASM */
  143 
  144 typedef u_int   uintfptr_t;
  145 
  146 #endif /* _KERNEL */
  147 
  148 /*
  149  * An unsigned integral type that can hold non-negative difference between
  150  * function pointers.
  151  */
  152 typedef u_int   fptrdiff_t;
  153 
  154 #ifdef _KERNEL
  155 
  156 void    mcount(uintfptr_t frompc, uintfptr_t selfpc);
  157 
  158 #else /* !_KERNEL */
  159 
  160 #include <sys/cdefs.h>
  161 
  162 __BEGIN_DECLS
  163 #ifdef __GNUCLIKE_ASM
  164 void    mcount(void) __asm(".mcount");
  165 #endif
  166 __END_DECLS
  167 
  168 #endif /* _KERNEL */
  169 
  170 #endif /* !_MACHINE_PROFILE_H_ */

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