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 _SYS_CDEFS_H_
   39 #error this file needs sys/cdefs.h as a prerequisite
   40 #endif
   41 
   42 #ifdef _KERNEL
   43 
   44 /*
   45  * Config generates something to tell the compiler to align functions on 16
   46  * byte boundaries.  A strict alignment is good for keeping the tables small.
   47  */
   48 #define FUNCTION_ALIGNMENT      16
   49 
   50 /*
   51  * The kernel uses assembler stubs instead of unportable inlines.
   52  * This is mainly to save a little time when profiling is not enabled,
   53  * which is the usual case for the kernel.
   54  */
   55 #define _MCOUNT_DECL void mcount
   56 #define MCOUNT
   57 
   58 #ifdef GUPROF
   59 #define MCOUNT_DECL(s)
   60 #define MCOUNT_ENTER(s)
   61 #define MCOUNT_EXIT(s)
   62 #ifdef __GNUCLIKE_ASM
   63 #define MCOUNT_OVERHEAD(label)                                          \
   64         __asm __volatile("pushl %0; call __mcount; popl %%ecx"          \
   65                          :                                              \
   66                          : "i" (label)                                  \
   67                          : "ax", "dx", "cx", "memory")
   68 #define MEXITCOUNT_OVERHEAD()                                           \
   69         __asm __volatile("call .mexitcount; 1:"                         \
   70                          : :                                            \
   71                          : "cx", "memory")
   72 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp)                            \
   73         __asm __volatile("movl $1b,%0" : "=rm" (labelp))
   74 #else
   75 #error
   76 #endif /* !__GNUCLIKE_ASM */
   77 #else /* !GUPROF */
   78 #define MCOUNT_DECL(s)  register_t s;
   79 #ifdef SMP
   80 extern int      mcount_lock;
   81 #define MCOUNT_ENTER(s) { s = intr_disable(); \
   82                           while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
   83                                 /* nothing */ ; }
   84 #define MCOUNT_EXIT(s)  { atomic_store_rel_int(&mcount_lock, 0); \
   85                           intr_restore(s); }
   86 #else
   87 #define MCOUNT_ENTER(s) { s = intr_disable(); }
   88 #define MCOUNT_EXIT(s)  (intr_restore(s))
   89 #endif
   90 #endif /* GUPROF */
   91 
   92 void bintr(void);
   93 void btrap(void);
   94 void eintr(void);
   95 #if 0
   96 void end_exceptions(void);
   97 void start_exceptions(void);
   98 #else
   99 #include <machine/pmc_mdep.h>           /* XXX */
  100 #endif
  101 void user(void);
  102 
  103 #include <machine/md_var.h>             /* XXX for setidt_disp */
  104 
  105 #define MCOUNT_DETRAMP(pc) do {                                 \
  106         if ((pc) >= (uintfptr_t)start_exceptions + setidt_disp && \
  107             (pc) < (uintfptr_t)end_exceptions + setidt_disp)    \
  108                 (pc) -= setidt_disp;                            \
  109 } while (0)
  110 
  111 #define MCOUNT_FROMPC_INTR(pc)                                  \
  112         ((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ?  \
  113             ((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr :    \
  114                 (uintfptr_t)btrap) : ~0U)
  115 
  116 #define MCOUNT_USERPC           ((uintfptr_t)user)
  117 
  118 #else /* !_KERNEL */
  119 
  120 #define FUNCTION_ALIGNMENT      4
  121 
  122 #define _MCOUNT_DECL static __inline void _mcount
  123 
  124 #ifdef __GNUCLIKE_ASM
  125 #define MCOUNT                                                          \
  126 void                                                                    \
  127 mcount()                                                                \
  128 {                                                                       \
  129         uintfptr_t selfpc, frompc, ecx;                                 \
  130         /*                                                              \
  131          * In gcc 4.2, ecx might be used in the caller as the arg       \
  132          * pointer if the stack realignment option is set (-mstackrealign) \
  133          * or if the caller has the force_align_arg_pointer attribute   \
  134          * (stack realignment is ALWAYS on for main).  Preserve ecx     \
  135          * here.                                                        \
  136          */                                                             \
  137         __asm("" : "=c" (ecx));                                         \
  138         /*                                                              \
  139          * Find the return address for mcount,                          \
  140          * and the return address for mcount's caller.                  \
  141          *                                                              \
  142          * selfpc = pc pushed by call to mcount                         \
  143          */                                                             \
  144         __asm("movl 4(%%ebp),%0" : "=r" (selfpc));                      \
  145         /*                                                              \
  146          * frompc = pc pushed by call to mcount's caller.               \
  147          * The caller's stack frame has already been built, so %ebp is  \
  148          * the caller's frame pointer.  The caller's raddr is in the    \
  149          * caller's frame following the caller's caller's frame pointer.\
  150          */                                                             \
  151         __asm("movl (%%ebp),%0" : "=r" (frompc));                       \
  152         frompc = ((uintfptr_t *)frompc)[1];                             \
  153         _mcount(frompc, selfpc);                                        \
  154         __asm("" : : "c" (ecx));                                        \
  155 }
  156 #else /* !__GNUCLIKE_ASM */
  157 #define MCOUNT
  158 #endif /* __GNUCLIKE_ASM */
  159 
  160 typedef u_int   uintfptr_t;
  161 
  162 #endif /* _KERNEL */
  163 
  164 /*
  165  * An unsigned integral type that can hold non-negative difference between
  166  * function pointers.
  167  */
  168 typedef u_int   fptrdiff_t;
  169 
  170 #ifdef _KERNEL
  171 
  172 void    mcount(uintfptr_t frompc, uintfptr_t selfpc);
  173 
  174 #else /* !_KERNEL */
  175 
  176 #include <sys/cdefs.h>
  177 
  178 __BEGIN_DECLS
  179 #ifdef __GNUCLIKE_ASM
  180 void    mcount(void) __asm(".mcount");
  181 #endif
  182 __END_DECLS
  183 
  184 #endif /* _KERNEL */
  185 
  186 #endif /* !_MACHINE_PROFILE_H_ */

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