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/asm.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * William Jolitz.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)DEFS.h        5.1 (Berkeley) 4/23/90
   37  * $FreeBSD: src/sys/i386/include/asm.h,v 1.2.2.2 1999/09/05 08:11:37 peter Exp $
   38  */
   39 
   40 #ifndef _MACHINE_ASM_H_
   41 #define _MACHINE_ASM_H_
   42 
   43 #include <sys/cdefs.h>
   44 
   45 #ifdef PIC
   46 #define PIC_PROLOGUE    \
   47         pushl   %ebx;   \
   48         call    1f;     \
   49 1:                      \
   50         popl    %ebx;   \
   51         addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
   52 #define PIC_EPILOGUE    \
   53         popl    %ebx
   54 #define PIC_PLT(x)      x@PLT
   55 #define PIC_GOT(x)      x@GOT(%ebx)
   56 #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
   57 #else
   58 #define PIC_PROLOGUE
   59 #define PIC_EPILOGUE
   60 #define PIC_PLT(x)      x
   61 #define PIC_GOT(x)      x
   62 #define PIC_GOTOFF(x)   x
   63 #endif
   64 
   65 /*
   66  * CNAME and HIDENAME manage the relationship between symbol names in C
   67  * and the equivalent assembly language names.  CNAME is given a name as
   68  * it would be used in a C program.  It expands to the equivalent assembly
   69  * language name.  HIDENAME is given an assembly-language name, and expands
   70  * to a possibly-modified form that will be invisible to C programs.
   71  */
   72 #if defined(__ELF__) /* { */
   73 #define CNAME(csym)             csym
   74 #define HIDENAME(asmsym)        __CONCAT(.,asmsym)
   75 #else /* } { */
   76 #define CNAME(csym)             __CONCAT(_,csym)
   77 #define HIDENAME(asmsym)        asmsym
   78 #endif /* } */
   79 
   80 
   81 /* XXX should use align 4,0x90 for -m486. */
   82 #define _START_ENTRY    .text; .p2align 2,0x90
   83 
   84 #define _ENTRY(x)       _START_ENTRY; \
   85                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
   86 
   87 #ifdef PROF
   88 #define ENTRY(x)        _ENTRY(x); \
   89                         pushl %ebp; movl %esp,%ebp; \
   90                         call PIC_PLT(HIDENAME(mcount)); \
   91                         popl %ebp
   92 #else
   93 #define ENTRY(x)        _ENTRY(x)
   94 #endif
   95 
   96 #define RCSID(x)        .text; .asciz x
   97 
   98 #ifdef _ARCH_INDIRECT
   99 /*
  100  * Generate code to select between the generic functions and _ARCH_INDIRECT
  101  * specific ones.
  102  * XXX nested __CONCATs don't work with non-ANSI cpp's.
  103  */
  104 #define ANAME(x)        CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
  105 #define ASELNAME(x)     CNAME(__CONCAT(__arch_select_,x))
  106 #define AVECNAME(x)     CNAME(__CONCAT(__arch_,x))
  107 #define GNAME(x)        CNAME(__CONCAT(__generic_,x))
  108 
  109 /* Don't bother profiling this. */
  110 #ifdef PIC
  111 #define ARCH_DISPATCH(x) \
  112                         _START_ENTRY; \
  113                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
  114                         PIC_PROLOGUE; \
  115                         movl PIC_GOT(AVECNAME(x)),%eax; \
  116                         PIC_EPILOGUE; \
  117                         jmpl *(%eax)
  118 
  119 #define ARCH_SELECT(x)  _START_ENTRY; \
  120                         .type ASELNAME(x),@function; \
  121                         ASELNAME(x): \
  122                         PIC_PROLOGUE; \
  123                         call PIC_PLT(CNAME(__get_hw_float)); \
  124                         testl %eax,%eax; \
  125                         movl PIC_GOT(ANAME(x)),%eax; \
  126                         jne 8f; \
  127                         movl PIC_GOT(GNAME(x)),%eax; \
  128                         8: \
  129                         movl PIC_GOT(AVECNAME(x)),%edx; \
  130                         movl %eax,(%edx); \
  131                         PIC_EPILOGUE; \
  132                         jmpl *%eax
  133 #else /* !PIC */
  134 #define ARCH_DISPATCH(x) \
  135                         _START_ENTRY; \
  136                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
  137                         jmpl *AVECNAME(x)
  138 
  139 #define ARCH_SELECT(x)  _START_ENTRY; \
  140                         .type ASELNAME(x),@function; \
  141                         ASELNAME(x): \
  142                         call CNAME(__get_hw_float); \
  143                         testl %eax,%eax; \
  144                         movl $ANAME(x),%eax; \
  145                         jne 8f; \
  146                         movl $GNAME(x),%eax; \
  147                         8: \
  148                         movl %eax,AVECNAME(x); \
  149                         jmpl *%eax
  150 #endif /* PIC */
  151 
  152 #define ARCH_VECTOR(x)  .data; .align 2; \
  153                         .globl AVECNAME(x); \
  154                         .type AVECNAME(x),@object; \
  155                         .size AVECNAME(x),4; \
  156                         AVECNAME(x): .long ASELNAME(x)
  157 
  158 #undef _ENTRY
  159 #define _ENTRY(x)       ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
  160                         _START_ENTRY; \
  161                         .globl ANAME(x); .type ANAME(x),@function; ANAME(x):
  162 
  163 #endif /* _ARCH_INDIRECT */
  164 
  165 #endif /* !_MACHINE_ASM_H_ */

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