The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/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/amd64/include/asm.h,v 1.17 2005/04/10 20:49:21 alc 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_PLT(x)      x@PLT
   43 #define PIC_GOT(x)      x@GOTPCREL(%rip)
   44 #else
   45 #define PIC_PLT(x)      x
   46 #define PIC_GOT(x)      x
   47 #endif
   48 
   49 /*
   50  * CNAME and HIDENAME manage the relationship between symbol names in C
   51  * and the equivalent assembly language names.  CNAME is given a name as
   52  * it would be used in a C program.  It expands to the equivalent assembly
   53  * language name.  HIDENAME is given an assembly-language name, and expands
   54  * to a possibly-modified form that will be invisible to C programs.
   55  */
   56 #define CNAME(csym)             csym
   57 #define HIDENAME(asmsym)        .asmsym
   58 
   59 #define _START_ENTRY    .text; .p2align 4,0x90
   60 
   61 #define _ENTRY(x)       _START_ENTRY; \
   62                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
   63 
   64 #ifdef PROF
   65 #define ALTENTRY(x)     _ENTRY(x); \
   66                         pushq %rbp; movq %rsp,%rbp; \
   67                         call PIC_PLT(HIDENAME(mcount)); \
   68                         popq %rbp; \
   69                         jmp 9f
   70 #define ENTRY(x)        _ENTRY(x); \
   71                         pushq %rbp; movq %rsp,%rbp; \
   72                         call PIC_PLT(HIDENAME(mcount)); \
   73                         popq %rbp; \
   74                         9:
   75 #else
   76 #define ALTENTRY(x)     _ENTRY(x)
   77 #define ENTRY(x)        _ENTRY(x)
   78 #endif
   79 
   80 #define RCSID(x)        .text; .asciz x
   81 
   82 #undef __FBSDID
   83 #if !defined(lint) && !defined(STRIP_FBSDID)
   84 #define __FBSDID(s)     .ident s
   85 #else
   86 #define __FBSDID(s)     /* nothing */
   87 #endif /* not lint and not STRIP_FBSDID */
   88 
   89 #endif /* !_MACHINE_ASM_H_ */

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