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

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * William Jolitz.
      *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)DEFS.h        5.1 (Berkeley) 4/23/90
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_ASM_H_
    #define _MACHINE_ASM_H_
    
    #include <sys/cdefs.h>
    
    #ifdef PIC
    #define PIC_PROLOGUE    \
            pushl   %ebx;   \
            call    1f;     \
    1:                      \
            popl    %ebx;   \
            addl    $_GLOBAL_OFFSET_TABLE_+[.-1b],%ebx
    #define PIC_EPILOGUE    \
            popl    %ebx
    #define PIC_PLT(x)      x@PLT
    #define PIC_GOT(x)      x@GOT(%ebx)
    #define PIC_GOTOFF(x)   x@GOTOFF(%ebx)
    #else
    #define PIC_PROLOGUE
    #define PIC_EPILOGUE
    #define PIC_PLT(x)      x
    #define PIC_GOTOFF(x)   x
    #endif
    
    /*
     * CNAME and HIDENAME manage the relationship between symbol names in C
     * and the equivalent assembly language names.  CNAME is given a name as
     * it would be used in a C program.  It expands to the equivalent assembly
     * language name.  HIDENAME is given an assembly-language name, and expands
     * to a possibly-modified form that will be invisible to C programs.
     */
    #define CNAME(csym)             csym
    #define HIDENAME(asmsym)        .asmsym
    
    /* XXX should use .p2align 4,0x90 for -m486. */
    #define _START_ENTRY    .text; .p2align 2,0x90
    
    #define _ENTRY(x)       _START_ENTRY; \
                            .globl CNAME(x); .type CNAME(x),@function; CNAME(x): \
                            .cfi_startproc
    #define END(x)          .cfi_endproc; .size x, . - x
    
    #ifdef PROF
    #define ALTENTRY(x)     _ENTRY(x); \
                            pushl %ebp; \
                            .cfi_def_cfa_offset 8; \
                            .cfi_offset %ebp, -8; \
                            movl %esp,%ebp; \
                            call PIC_PLT(HIDENAME(mcount)); \
                            popl %ebp; \
                            .cfi_restore %ebp; \
                            .cfi_def_cfa_offset 4; \
                            jmp 9f
    #define ENTRY(x)        _ENTRY(x); \
                            pushl %ebp; \
                            .cfi_def_cfa_offset 8; \
                            .cfi_offset %ebp, -8; \
                            movl %esp,%ebp; \
                            call PIC_PLT(HIDENAME(mcount)); \
                            popl %ebp; \
                            .cfi_restore %ebp; \
                            .cfi_def_cfa_offset 4; \
                           9:
   #else
   #define ALTENTRY(x)     _ENTRY(x)
   #define ENTRY(x)        _ENTRY(x)
   #endif
   
   /*
    * WEAK_REFERENCE(): create a weak reference alias from sym.
    * The macro is not a general asm macro that takes arbitrary names,
    * but one that takes only C names. It does the non-null name
    * translation inside the macro.
    */
   
   #define WEAK_REFERENCE(sym, alias)                                      \
           .weak CNAME(alias);                                             \
           .equ CNAME(alias),CNAME(sym)
   
   /*
    * STRONG_ALIAS: create a strong alias.
    */
   #define STRONG_ALIAS(alias,sym)                                         \
           .globl alias;                                                   \
           alias = sym
   
   #define RCSID(x)        .text; .asciz x
   
   #undef __FBSDID
   #if !defined(STRIP_FBSDID)
   #define __FBSDID(s)     .ident s
   #else
   #define __FBSDID(s)     /* nothing */
   #endif /* not STRIP_FBSDID */
   
   #endif /* !_MACHINE_ASM_H_ */

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