decode.h

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/****************************************************************************
*
*                                               Realmode X86 Emulator Library
*
*               Copyright (C) 1996-1999 SciTech Software, Inc.
*                                    Copyright (C) David Mosberger-Tang
*                                          Copyright (C) 1999 Egbert Eich
*
*  ========================================================================
*
*  Permission to use, copy, modify, distribute, and sell this software and
*  its documentation for any purpose is hereby granted without fee,
*  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 authors not be used
*  in advertising or publicity pertaining to distribution of the software
*  without specific, written prior permission.  The authors makes no
*  representations about the suitability of this software for any purpose.
*  It is provided "as is" without express or implied warranty.
*
*  THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
*  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
*  EVENT SHALL THE AUTHORS 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.
*
*  ========================================================================
*
* Language:             ANSI C
* Environment:  Any
* Developer:    Kendall Bennett
*
* Description:  Header file for instruction decoding logic.
*
****************************************************************************/
 
#ifndef __X86EMU_DECODE_H
#define __X86EMU_DECODE_H
 
/*---------------------- Macros and type definitions ----------------------*/
 
/* Instruction Decoding Stuff */
 
#define FETCH_DECODE_MODRM(mod,rh,rl)   fetch_decode_modrm(&mod,&rh,&rl)
#define DECODE_RM_BYTE_REGISTER(r)      decode_rm_byte_register(r)
#define DECODE_RM_WORD_REGISTER(r)      decode_rm_word_register(r)
#define DECODE_RM_LONG_REGISTER(r)      decode_rm_long_register(r)
#define DECODE_CLEAR_SEGOVR()           M.x86.mode &= ~SYSMODE_CLRMASK
 
/*-------------------------- Function Prototypes --------------------------*/
 
#ifdef  __cplusplus
extern "C" {                                    /* Use "C" linkage when in C++ mode */
#endif
 
void    x86emu_intr_raise (u8 type);
void    fetch_decode_modrm (int *mod,int *regh,int *regl);
u8      fetch_byte_imm (void);
u16     fetch_word_imm (void);
u32     fetch_long_imm (void);
u8      fetch_data_byte (uint offset);
u8      fetch_data_byte_abs (uint segment, uint offset);
u16     fetch_data_word (uint offset);
u16     fetch_data_word_abs (uint segment, uint offset);
u32     fetch_data_long (uint offset);
u32     fetch_data_long_abs (uint segment, uint offset);
void    store_data_byte (uint offset, u8 val);
void    store_data_byte_abs (uint segment, uint offset, u8 val);
void    store_data_word (uint offset, u16 val);
void    store_data_word_abs (uint segment, uint offset, u16 val);
void    store_data_long (uint offset, u32 val);
void    store_data_long_abs (uint segment, uint offset, u32 val);
u8*     decode_rm_byte_register(int reg);
u16*    decode_rm_word_register(int reg);
u32*    decode_rm_long_register(int reg);
u16*    decode_rm_seg_register(int reg);
unsigned int decode_rm00_address(int rm);
unsigned int decode_rm01_address(int rm);
unsigned int decode_rm10_address(int rm);
unsigned int decode_rmXX_address(int mod, int rm);
 
#ifdef  __cplusplus
}                                               /* End of "C" linkage for C++           */
#endif
 
#endif /* __X86EMU_DECODE_H */