FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/asm.h

     /*-
      * 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.
     * 4. 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: releng/9.0/sys/amd64/include/asm.h 171914 2007-08-22 04:26:07Z jkoshy $
     */
    
    #ifndef _MACHINE_ASM_H_
    #define _MACHINE_ASM_H_
    
    #include <sys/cdefs.h>
    
    #ifdef PIC
    #define PIC_PLT(x)      x@PLT
    #define PIC_GOT(x)      x@GOTPCREL(%rip)
    #else
    #define PIC_PLT(x)      x
    #define PIC_GOT(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
    
    #define _START_ENTRY    .text; .p2align 4,0x90
    
    #define _ENTRY(x)       _START_ENTRY; \
                            .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
    
    #ifdef PROF
    #define ALTENTRY(x)     _ENTRY(x); \
                            pushq %rbp; movq %rsp,%rbp; \
                            call PIC_PLT(HIDENAME(mcount)); \
                            popq %rbp; \
                            jmp 9f
    #define ENTRY(x)        _ENTRY(x); \
                            pushq %rbp; movq %rsp,%rbp; \
                            call PIC_PLT(HIDENAME(mcount)); \
                            popq %rbp; \
                            9:
    #else
    #define ALTENTRY(x)     _ENTRY(x)
    #define ENTRY(x)        _ENTRY(x)
    #endif
    
    #define END(x)          .size x, . - x
    
    #define RCSID(x)        .text; .asciz x
    
    #undef __FBSDID
    #if !defined(lint) && !defined(STRIP_FBSDID)
    #define __FBSDID(s)     .ident s
    #else
    #define __FBSDID(s)     /* nothing */
    #endif /* not lint and not STRIP_FBSDID */
    
    #endif /* !_MACHINE_ASM_H_ */

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