opdesc.h

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C头文件 代码 · 共 51 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
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*  ========================================================================
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
*               DESCRIBE IT HERE!
*
****************************************************************************/


typedef struct {
    ins_name            name;
    operand_type        op_type;
} op_desc;


/* MD REG R/M */
#define _ModField( p )          ( ( p & 0xc0 ) >> 6 )
#define _RegField( p )          ( ( p & 0x38 ) >> 3 )
#define _RMField( p )           ( p & 7 )

/* SS-III-BBB */
#define _ScaleField( p )        _ModField( p )
#define _IndexField( p )        _RegField( p )
#define _BaseField( p )         _RMField( p )

#define _SegReg2Field( p )       ( ( p & 0x18 ) >> 3 )
#define _SegReg3Field( p )       ( ( p & 0x38 ) >> 3 )