bsd_asm.h

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/*-
 * 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: src/sys/i386/include/asm.h,v 1.14 2007/08/22 04:26:07 jkoshy Exp $
 */
 
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
 
#if defined(__APPLE__)
#include "osx_asm.h"
#define CNAME(x) EXT(x)
#else
#include "cdefs-compat.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)
#else
#define PIC_PROLOGUE
#define PIC_EPILOGUE
#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.
 */
 
 
/* XXX should use .p2align 4,0x90 for -m486. */
#define _START_ENTRY .p2align 2,0x90
 
#if defined(__ELF__)
#define CNAME(csym)     csym
#define HIDENAME(asmsym)    .asmsym
#define _ENTRY(x) .text; _START_ENTRY; \
            .globl CNAME(x); .type CNAME(x),@function; CNAME(x):
#define END(x)      .size x, . - x
#elif defined(_WIN32)
#ifndef _MSC_VER
#define END(x) .end
#define _START_ENTRY_WIN .text; _START_ENTRY
#else
#define END(x) end
#define _START_ENTRY_WIN .code; _START_ENTRY
#endif
#define CNAME(csym)     _##csym
#define HIDENAME(asmsym)    .asmsym
#define _ENTRY(x) _START_ENTRY_WIN; \
            .globl CNAME(x); .section .drectve; .ascii " -export:", #x; \
            .section .text; .def CNAME(x); .scl 2; .type 32; .endef; CNAME(x):
#endif
 
#ifdef PROF
#define ALTENTRY(x) _ENTRY(x); \
            pushl %ebp; movl %esp,%ebp; \
            call PIC_PLT(HIDENAME(mcount)); \
            popl %ebp; \
            jmp 9f
#define ENTRY(x)    _ENTRY(x); \
            pushl %ebp; movl %esp,%ebp; \
            call PIC_PLT(HIDENAME(mcount)); \
            popl %ebp; \
            9:
#else
#define ALTENTRY(x) _ENTRY(x)
#define ENTRY(x)    _ENTRY(x)
#endif
 
#define RCSID(x)    .text; .asciz x
 
#undef __FBSDID
#define __FBSDID(s) /* nothing */
 
#endif
#endif /* !_MACHINE_ASM_H_ */