sys/arch/i386/include/profile.h

   1 /*      $NetBSD: profile.h,v 1.33 2007/12/20 23:46:13 ad Exp $  */
   2
   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  */
  33
  34 #ifdef _KERNEL_OPT
  35 #include "opt_multiprocessor.h"
  36 #endif
  37
  38 #ifdef _KERNEL
  39 #include <machine/cpufunc.h>
  40 #include <machine/lock.h>
  41 #endif
  42
  43 #define _MCOUNT_DECL static __inline void _mcount
  44
  45 #ifdef __ELF__
  46 #define MCOUNT_ENTRY    "__mcount"
  47 #define MCOUNT_COMPAT   __weak_alias(mcount, __mcount)
  48 #else
  49 #define MCOUNT_ENTRY    "mcount"
  50 #define MCOUNT_COMPAT   /* nothing */
  51 #endif
  52
  53 #define MCOUNT \
  54 MCOUNT_COMPAT                                                           \
  55 extern void mcount(void) __asm(MCOUNT_ENTRY)                            \
  56         __attribute__((__no_instrument_function__));                    \
  57 void                                                                    \
  58 mcount(void)                                                            \
  59 {                                                                       \
  60         int selfpc, frompcindex;                                        \
  61         int eax, ecx, edx;                                              \
  62                                                                         \
  63         __asm volatile("movl %%eax,%0" : "=g" (eax));                   \
  64         __asm volatile("movl %%ecx,%0" : "=g" (ecx));                   \
  65         __asm volatile("movl %%edx,%0" : "=g" (edx));                   \
  66         /*                                                              \
  67          * find the return address for mcount,                          \
  68          * and the return address for mcount's caller.                  \
  69          *                                                              \
  70          * selfpc = pc pushed by mcount call                            \
  71          */                                                             \
  72         __asm volatile("movl 4(%%ebp),%0" : "=r" (selfpc));             \
  73         /*                                                              \
  74          * frompcindex = pc pushed by call into self.                   \
  75          */                                                             \
  76         __asm volatile("movl (%%ebp),%0;movl 4(%0),%0"                  \
  77             : "=r" (frompcindex));                                      \
  78         _mcount((u_long)frompcindex, (u_long)selfpc);                   \
  79                                                                         \
  80         __asm volatile("movl %0,%%edx" : : "g" (edx));                  \
  81         __asm volatile("movl %0,%%ecx" : : "g" (ecx));                  \
  82         __asm volatile("movl %0,%%eax" : : "g" (eax));                  \
  83 }
  84
  85 #ifdef _KERNEL
  86 #ifdef MULTIPROCESSOR
  87 __cpu_simple_lock_t __mcount_lock;
  88
  89 static inline void
  90 MCOUNT_ENTER_MP(void)
  91 {
  92         __cpu_simple_lock(&__mcount_lock);
  93         __insn_barrier();
  94 }
  95
  96 static inline void
  97 MCOUNT_EXIT_MP(void)
  98 {
  99         __insn_barrier();
 100         __mcount_lock = __SIMPLELOCK_UNLOCKED;
 101 }
 102 #else
 103 #define MCOUNT_ENTER_MP()
 104 #define MCOUNT_EXIT_MP()
 105 #endif
 106
 107 static inline void
 108 mcount_disable_intr(void)
 109 {
 110         __asm volatile("cli");
 111 }
 112
 113 static inline u_long
 114 mcount_read_psl(void)
 115 {
 116         u_long  ef;
 117
 118         __asm volatile("pushfl; popl %0" : "=r" (ef));
 119         return (ef);
 120 }
 121
 122 static inline void
 123 mcount_write_psl(u_long ef)
 124 {
 125         __asm volatile("pushl %0; popfl" : : "r" (ef));
 126 }
 127
 128 #define MCOUNT_ENTER                                                    \
 129         s = (int)mcount_read_psl();                                     \
 130         mcount_disable_intr();                                          \
 131         MCOUNT_ENTER_MP();
 132
 133 #define MCOUNT_EXIT                                                     \
 134         MCOUNT_EXIT_MP();                                               \
 135         mcount_write_psl(s);
 136
 137 #endif /* _KERNEL */