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/amd64/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: stable/11/sys/amd64/include/profile.h 214346 2010-10-25 15:28:03Z jhb $
   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("pushq %0; call __mcount; popq %%rcx"          \
   63                          :                                              \
   64                          : "i" (label)                                  \
   65                          : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory")
   66 #define MEXITCOUNT_OVERHEAD()                                           \
   67         __asm __volatile("call .mexitcount; 1:"                         \
   68                          : :                                            \
   69                          : "ax", "dx", "cx", "di", "si", "r8", "r9", "memory")
   70 #define MEXITCOUNT_OVERHEAD_GETLABEL(labelp)                            \
   71         __asm __volatile("movq $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 this file needs to be ported to your compiler
   78 #endif /* !__GNUCLIKE_ASM */
   79 #else /* !GUPROF */
   80 #define MCOUNT_DECL(s)  register_t s;
   81 #ifdef SMP
   82 extern int      mcount_lock;
   83 #define MCOUNT_ENTER(s) { s = intr_disable(); \
   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                           intr_restore(s); }
   88 #else
   89 #define MCOUNT_ENTER(s) { s = intr_disable(); }
   90 #define MCOUNT_EXIT(s)  (intr_restore(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) : ~0UL)
  106 
  107 #else /* !_KERNEL */
  108 
  109 #define FUNCTION_ALIGNMENT      4
  110 
  111 #define _MCOUNT_DECL \
  112 static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
  113 static void _mcount
  114 
  115 #ifdef __GNUCLIKE_ASM
  116 #define MCOUNT __asm("                  \n\
  117         .text                           \n\
  118         .p2align 4,0x90                 \n\
  119         .globl  .mcount                 \n\
  120         .type   .mcount,@function       \n\
  121 .mcount:                                \n\
  122         pushq   %rdi                    \n\
  123         pushq   %rsi                    \n\
  124         pushq   %rdx                    \n\
  125         pushq   %rcx                    \n\
  126         pushq   %r8                     \n\
  127         pushq   %r9                     \n\
  128         pushq   %rax                    \n\
  129         movq    8(%rbp),%rdi            \n\
  130         movq    7*8(%rsp),%rsi          \n\
  131         call    _mcount                 \n\
  132         popq    %rax                    \n\
  133         popq    %r9                     \n\
  134         popq    %r8                     \n\
  135         popq    %rcx                    \n\
  136         popq    %rdx                    \n\
  137         popq    %rsi                    \n\
  138         popq    %rdi                    \n\
  139         ret                             \n\
  140         .size   .mcount, . - .mcount");
  141 #if 0
  142 /*
  143  * We could use this, except it doesn't preserve the registers that were
  144  * being passed with arguments to the function that we were inserted
  145  * into.  I've left it here as documentation of what the code above is
  146  * supposed to do.
  147  */
  148 #define MCOUNT                                                          \
  149 void                                                                    \
  150 mcount()                                                                \
  151 {                                                                       \
  152         uintfptr_t selfpc, frompc;                                      \
  153         /*                                                              \
  154          * Find the return address for mcount,                          \
  155          * and the return address for mcount's caller.                  \
  156          *                                                              \
  157          * selfpc = pc pushed by call to mcount                         \
  158          */                                                             \
  159         __asm("movq 8(%%rbp),%0" : "=r" (selfpc));                      \
  160         /*                                                              \
  161          * frompc = pc pushed by call to mcount's caller.               \
  162          * The caller's stack frame has already been built, so %rbp is  \
  163          * the caller's frame pointer.  The caller's raddr is in the    \
  164          * caller's frame following the caller's caller's frame pointer.\
  165          */                                                             \
  166         __asm("movq (%%rbp),%0" : "=r" (frompc));                       \
  167         frompc = ((uintfptr_t *)frompc)[1];                             \
  168         _mcount(frompc, selfpc);                                        \
  169 }
  170 #endif
  171 #else /* !__GNUCLIKE_ASM */
  172 #define MCOUNT
  173 #endif /* __GNUCLIKE_ASM */
  174 
  175 typedef u_long  uintfptr_t;
  176 
  177 #endif /* _KERNEL */
  178 
  179 /*
  180  * An unsigned integral type that can hold non-negative difference between
  181  * function pointers.
  182  */
  183 typedef u_long  fptrdiff_t;
  184 
  185 #ifdef _KERNEL
  186 
  187 void    mcount(uintfptr_t frompc, uintfptr_t selfpc);
  188 
  189 #else /* !_KERNEL */
  190 
  191 #include <sys/cdefs.h>
  192 
  193 __BEGIN_DECLS
  194 #ifdef __GNUCLIKE_ASM
  195 void    mcount(void) __asm(".mcount");
  196 #endif
  197 __END_DECLS
  198 
  199 #endif /* _KERNEL */
  200 
  201 #endif /* !_MACHINE_PROFILE_H_ */

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