assyntax.h

基于组件方式开发操作系统的OSKIT源代码

/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/assyntax.h,v 3.7.2.2 1997/05/11 02:56:22 dawes Exp $ */
#ifndef __ASSYNTAX_H__
#define	__ASSYNTAX_H__

/*
 * Copyright 1992 Vrije Universiteit, The Netherlands
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose and without fee is hereby granted, provided
 * that the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of the Vrije Universiteit not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  The Vrije Universiteit makes no
 * representations about the suitability of this software for any purpose.
 * It is provided "as is" without express or implied warranty.
 *
 * The Vrije Universiteit DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL The Vrije Universiteit BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */
/* $XConsortium: assyntax.h /main/5 1996/02/21 17:50:49 kaleb $ */

 /*
 * assyntax.h
 *
 * Select the syntax appropriate to the 386 assembler being used
 * To add support for more assemblers add more columns to the CHOICE
 * macro.  Note that register names must also have uppercase names
 * to avoid macro recursion. e.g., #define ah %ah recurses!
 *
 * NB 1.  Some of the macros for certain assemblers imply that the code is to
 *	  run in protected mode!!  Caveat emptor.
 *
 * NB 2.  486 specific instructions are not included.  This is to discourage
 *	  their accidental use in code that is intended to run on 386 and 486
 *	  systems.
 *
 * Supported assemblers:
 *
 * (a) AT&T SysVr4 as(1):	default
 * (b) GNU Assembler gas:	define USE_GAS or GNU_ASSEMBLER
 * (c) Amsterdam Compiler kit:	define ACK_ASSEMBLER
 *
 * The following naming conventions have been used to identify the various
 * data types:
 *		_SR = segment register version
 *	Integer:
 *		_Q = quadword	= 64 bits
 *		_L = long	= 32 bits
 *		_W = short	= 16 bits
 *		_B = byte	=  8 bits
 *	Floating-point:
 *		_X = m80real	= 80 bits
 *		_D = double	= 64 bits
 *		_S = single	= 32 bits
 *
 * Author: Gregory J. Sharp, Sept 1992
 *         Vrije Universiteit, Amsterdam, The Netherlands
 */

#if defined(USE_GAS) && !defined(GNU_ASSEMBLER)
#define GNU_ASSEMBLER
#endif

#if (defined(__STDC__) && !defined(UNIXCPP)) || (defined (sun) && defined (i386) && defined (SVR4) && defined (__STDC__) && !defined (__GNUC__)) 
#define	CONCAT(x, y)	x ## y
#else
#define	CONCAT(x, y)	x/**/y
#endif

#ifdef ACK_ASSEMBLER

/* Assume we write code for 32-bit protected mode! */

/* Redefine register names for GAS & AT&T assemblers */
#define	AL	al
#define	AH	ah
#define	AX	ax
#define	EAX	ax
#define	BL	bl
#define	BH	bh
#define	BX	bx
#define	EBX	bx
#define	CL	cl
#define	CH	ch
#define	CX	cx
#define	ECX	cx
#define	DL	dl
#define	DH	dh
#define	DX	dx
#define	EDX	dx
#define	BP	bp
#define	EBP	bp
#define	SI	si
#define	ESI	si
#define	DI	di
#define	EDI	di
#define	SP	sp
#define	ESP	sp
#define	CS	cs
#define	SS	ss
#define	DS	ds
#define	ES	es
#define	FS	fs
#define	GS	gs
/* Control Registers */
#define	CR0	cr0
#define	CR1	cr1
#define	CR2	cr2
#define	CR3	cr3
/* Debug Registers */
#define	DR0	dr0
#define	DR1	dr1
#define	DR2	dr2
#define	DR3	dr3
#define	DR4	dr4
#define	DR5	dr5
#define	DR6	dr6
#define	DR7	dr7
/* Floating-point Stack */
#define	ST	st

#define	AS_BEGIN	.sect .text; .sect .rom; .sect .data; .sect .bss; .sect .text


#define	_WTOG		o16	/* word toggle for _W instructions */
#define	_LTOG			/* long toggle for _L instructions */
#define	ADDR_TOGGLE	a16
#define	OPSZ_TOGGLE	o16
#define	USE16		.use16
#define	USE32		.use32

#define	CHOICE(a,b,c)	c

#else /* AT&T or GAS */

/* Redefine register names for GAS & AT&T assemblers */
#define	AL	%al
#define	AH	%ah
#define	AX	%ax
#define	EAX	%eax
#define	BL	%bl
#define	BH	%bh
#define	BX	%bx
#define	EBX	%ebx
#define	CL	%cl
#define	CH	%ch
#define	CX	%cx
#define	ECX	%ecx
#define	DL	%dl
#define	DH	%dh
#define	DX	%dx
#define	EDX	%edx
#define	BP	%bp
#define	EBP	%ebp
#define	SI	%si
#define	ESI	%esi
#define	DI	%di
#define	EDI	%edi
#define	SP	%sp
#define	ESP	%esp
#define	CS	%cs
#define	SS	%ss
#define	DS	%ds
#define	ES	%es
#define	FS	%fs
#define	GS	%gs
/* Control Registers */
#define	CR0	%cr0
#define	CR1	%cr1
#define	CR2	%cr2
#define	CR3	%cr3
/* Debug Registers */
#define	DR0	%db0
#define	DR1	%db1
#define	DR2	%db2
#define	DR3	%db3
#define	DR4	%db4
#define	DR5	%db5
#define	DR6	%db6
#define	DR7	%db7
/* Floating-point Stack */
#define	ST	%st

#define	AS_BEGIN
#define	USE16
#define	USE32

#ifdef GNU_ASSEMBLER

#define	ADDR_TOGGLE	aword
#define	OPSZ_TOGGLE	word

#define	CHOICE(a,b,c)	b

#else
/*
 * AT&T ASSEMBLER SYNTAX
 * *********************
 */
#define	CHOICE(a,b,c)	a

#define	ADDR_TOGGLE	addr16
#define	OPSZ_TOGGLE	data16

#endif /* GNU_ASSEMBLER */
#endif /* ACK_ASSEMBLER */


#if defined(Lynx) || (defined(SYSV) || defined(SVR4)) && !defined(ACK_ASSEMBLER) || (defined(linux) || defined(__OS2ELF__)) && defined(__ELF__) || defined (OSKIT) && defined(__ELF__)
#define GLNAME(a)       a
#else
#define GLNAME(a)       CONCAT(_,a)
#endif


	/****************************************/
	/*					*/
	/*	Select the various choices	*/
	/*					*/
	/****************************************/


/* Redefine assembler directives */
/*********************************/
#define GLOBL		CHOICE(.globl, .globl, .extern)
#define	ALIGNTEXT4	CHOICE(.align 4, .align ARG2(2,0x90), .align 4)
#define	ALIGNTEXT2	CHOICE(.align 2, .align ARG2(1,0x90), .align 2)
/* ALIGNTEXT4ifNOP is the same as ALIGNTEXT4, but only if the space is
 * guaranteed to be filled with NOPs.  Otherwise it does nothing.
 */
#define	ALIGNTEXT4ifNOP	CHOICE(.align 4, .align ARG2(2,0x90), /*can't do it*/)
#define	ALIGNDATA4	CHOICE(.align 4, .align ARG2(2,0x0), .align 4)
#define	ALIGNDATA2	CHOICE(.align 2, .align ARG2(1,0x0), .align 2)
#define	FILE(s)		CHOICE(.file s, .file s, .file s)
#define	STRING(s)	CHOICE(.string s, .asciz s, .asciz s)
#define	D_LONG		CHOICE(.long, .long, .data4)