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  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)DEFS.h        5.1 (Berkeley) 4/23/90
   35  * $FreeBSD: releng/12.0/sys/i386/include/asm.h 326123 2017-11-23 11:40:16Z kib $
   36  */
   37 
   38 #ifndef _MACHINE_ASM_H_
   39 #define _MACHINE_ASM_H_
   40 
   41 #include <sys/cdefs.h>
   42 
   43 #ifdef PIC
   44 #define PIC_PROLOGUE    \
   45         pushl   %ebx;   \
   46         call    1f;     \
   47 1:                      \
   48         popl    %ebx;   \
   49         addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
   50 #define PIC_EPILOGUE    \
   51         popl    %ebx
   52 #define PIC_PLT(x)      x@PLT
   53 #define PIC_GOT(x)      x@GOT(%ebx)
   54 #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
   55 #else
   56 #define PIC_PROLOGUE
   57 #define PIC_EPILOGUE
   58 #define PIC_PLT(x)      x
   59 #define PIC_GOTOFF(x)   x
   60 #endif
   61 
   62 /*
   63  * CNAME and HIDENAME manage the relationship between symbol names in C
   64  * and the equivalent assembly language names.  CNAME is given a name as
   65  * it would be used in a C program.  It expands to the equivalent assembly
   66  * language name.  HIDENAME is given an assembly-language name, and expands
   67  * to a possibly-modified form that will be invisible to C programs.
   68  */
   69 #define CNAME(csym)             csym
   70 #define HIDENAME(asmsym)        .asmsym
   71 
   72 /* XXX should use .p2align 4,0x90 for -m486. */
   73 #define _START_ENTRY    .text; .p2align 2,0x90
   74 
   75 #define _ENTRY(x)       _START_ENTRY; \
   76                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
   77 #define END(x)          .size x, . - x
   78 
   79 #ifdef PROF
   80 #define ALTENTRY(x)     _ENTRY(x); \
   81                         pushl %ebp; movl %esp,%ebp; \
   82                         call PIC_PLT(HIDENAME(mcount)); \
   83                         popl %ebp; \
   84                         jmp 9f
   85 #define ENTRY(x)        _ENTRY(x); \
   86                         pushl %ebp; movl %esp,%ebp; \
   87                         call PIC_PLT(HIDENAME(mcount)); \
   88                         popl %ebp; \
   89                         9:
   90 #else
   91 #define ALTENTRY(x)     _ENTRY(x)
   92 #define ENTRY(x)        _ENTRY(x)
   93 #endif
   94 
   95 /*
   96  * WEAK_REFERENCE(): create a weak reference alias from sym.
   97  * The macro is not a general asm macro that takes arbitrary names,
   98  * but one that takes only C names. It does the non-null name
   99  * translation inside the macro.
  100  */
  101 
  102 #define WEAK_REFERENCE(sym, alias)                                      \
  103         .weak CNAME(alias);                                             \
  104         .equ CNAME(alias),CNAME(sym)
  105 
  106 /*
  107  * STRONG_ALIAS: create a strong alias.
  108  */
  109 #define STRONG_ALIAS(alias,sym)                                         \
  110         .globl alias;                                                   \
  111         alias = sym
  112 
  113 #define RCSID(x)        .text; .asciz x
  114 
  115 #undef __FBSDID
  116 #if !defined(STRIP_FBSDID)
  117 #define __FBSDID(s)     .ident s
  118 #else
  119 #define __FBSDID(s)     /* nothing */
  120 #endif /* not STRIP_FBSDID */
  121 
  122 #endif /* !_MACHINE_ASM_H_ */

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