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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)DEFS.h        5.1 (Berkeley) 4/23/90
   33  * $FreeBSD: src/sys/i386/include/asm.h,v 1.13 2004/04/07 20:46:05 imp Exp $
   34  */
   35 
   36 #ifndef _MACHINE_ASM_H_
   37 #define _MACHINE_ASM_H_
   38 
   39 #include <sys/cdefs.h>
   40 
   41 #ifdef PIC
   42 #define PIC_PROLOGUE    \
   43         pushl   %ebx;   \
   44         call    1f;     \
   45 1:                      \
   46         popl    %ebx;   \
   47         addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
   48 #define PIC_EPILOGUE    \
   49         popl    %ebx
   50 #define PIC_PLT(x)      x@PLT
   51 #define PIC_GOT(x)      x@GOT(%ebx)
   52 #else
   53 #define PIC_PROLOGUE
   54 #define PIC_EPILOGUE
   55 #define PIC_PLT(x)      x
   56 #define PIC_GOT(x)      x
   57 #endif
   58 
   59 /*
   60  * CNAME and HIDENAME manage the relationship between symbol names in C
   61  * and the equivalent assembly language names.  CNAME is given a name as
   62  * it would be used in a C program.  It expands to the equivalent assembly
   63  * language name.  HIDENAME is given an assembly-language name, and expands
   64  * to a possibly-modified form that will be invisible to C programs.
   65  */
   66 #define CNAME(csym)             csym
   67 #define HIDENAME(asmsym)        .asmsym
   68 
   69 /* XXX should use .p2align 4,0x90 for -m486. */
   70 #define _START_ENTRY    .text; .p2align 2,0x90
   71 
   72 #define _ENTRY(x)       _START_ENTRY; \
   73                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
   74 
   75 #ifdef PROF
   76 #define ALTENTRY(x)     _ENTRY(x); \
   77                         pushl %ebp; movl %esp,%ebp; \
   78                         call PIC_PLT(HIDENAME(mcount)); \
   79                         popl %ebp; \
   80                         jmp 9f
   81 #define ENTRY(x)        _ENTRY(x); \
   82                         pushl %ebp; movl %esp,%ebp; \
   83                         call PIC_PLT(HIDENAME(mcount)); \
   84                         popl %ebp; \
   85                         9:
   86 #else
   87 #define ALTENTRY(x)     _ENTRY(x)
   88 #define ENTRY(x)        _ENTRY(x)
   89 #endif
   90 
   91 #define RCSID(x)        .text; .asciz x
   92 
   93 #undef __FBSDID
   94 #if !defined(lint) && !defined(STRIP_FBSDID)
   95 #define __FBSDID(s)     .ident s
   96 #else
   97 #define __FBSDID(s)     /* nothing */
   98 #endif /* not lint and not STRIP_FBSDID */
   99 
  100 #endif /* !_MACHINE_ASM_H_ */

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