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: releng/10.0/sys/i386/include/asm.h 254463 2013-08-17 19:24:58Z jilles $
   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 #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
   53 #else
   54 #define PIC_PROLOGUE
   55 #define PIC_EPILOGUE
   56 #define PIC_PLT(x)      x
   57 #define PIC_GOTOFF(x)   x
   58 #endif
   59 
   60 /*
   61  * CNAME and HIDENAME manage the relationship between symbol names in C
   62  * and the equivalent assembly language names.  CNAME is given a name as
   63  * it would be used in a C program.  It expands to the equivalent assembly
   64  * language name.  HIDENAME is given an assembly-language name, and expands
   65  * to a possibly-modified form that will be invisible to C programs.
   66  */
   67 #define CNAME(csym)             csym
   68 #define HIDENAME(asmsym)        .asmsym
   69 
   70 /* XXX should use .p2align 4,0x90 for -m486. */
   71 #define _START_ENTRY    .text; .p2align 2,0x90
   72 
   73 #define _ENTRY(x)       _START_ENTRY; \
   74                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
   75 #define END(x)          .size x, . - x
   76 
   77 #ifdef PROF
   78 #define ALTENTRY(x)     _ENTRY(x); \
   79                         pushl %ebp; movl %esp,%ebp; \
   80                         call PIC_PLT(HIDENAME(mcount)); \
   81                         popl %ebp; \
   82                         jmp 9f
   83 #define ENTRY(x)        _ENTRY(x); \
   84                         pushl %ebp; movl %esp,%ebp; \
   85                         call PIC_PLT(HIDENAME(mcount)); \
   86                         popl %ebp; \
   87                         9:
   88 #else
   89 #define ALTENTRY(x)     _ENTRY(x)
   90 #define ENTRY(x)        _ENTRY(x)
   91 #endif
   92 
   93 /*
   94  * WEAK_ALIAS: create a weak alias.
   95  */
   96 #define WEAK_ALIAS(alias,sym)                                           \
   97         .weak alias;                                                    \
   98         alias = sym
   99 
  100 /*
  101  * STRONG_ALIAS: create a strong alias.
  102  */
  103 #define STRONG_ALIAS(alias,sym)                                         \
  104         .globl alias;                                                   \
  105         alias = sym
  106 
  107 #define RCSID(x)        .text; .asciz x
  108 
  109 #undef __FBSDID
  110 #if !defined(lint) && !defined(STRIP_FBSDID)
  111 #define __FBSDID(s)     .ident s
  112 #else
  113 #define __FBSDID(s)     /* nothing */
  114 #endif /* not lint and not STRIP_FBSDID */
  115 
  116 #endif /* !_MACHINE_ASM_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/i386/include/asm.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/include/asm.h