1 /****************************************************************************
2 *
3 *                       Realmode X86 Emulator Library
4 *
5 *               Copyright (C) 1991-2004 SciTech Software, Inc.
6 *                    Copyright (C) David Mosberger-Tang
7 *                      Copyright (C) 1999 Egbert Eich
8 *
9 *  ========================================================================
10 *
11 *  Permission to use, copy, modify, distribute, and sell this software and
12 *  its documentation for any purpose is hereby granted without fee,
13 *  provided that the above copyright notice appear in all copies and that
14 *  both that copyright notice and this permission notice appear in
15 *  supporting documentation, and that the name of the authors not be used
16 *  in advertising or publicity pertaining to distribution of the software
17 *  without specific, written prior permission.  The authors makes no
18 *  representations about the suitability of this software for any purpose.
19 *  It is provided "as is" without express or implied warranty.
20 *
21 *  THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
22 *  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
23 *  EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
24 *  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
25 *  USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
26 *  OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
27 *  PERFORMANCE OF THIS SOFTWARE.
28 *
29 *  ========================================================================
30 *
31 * Language:     ANSI C
32 * Environment:  Any
33 * Developer:    Kendall Bennett
34 *
35 * Description:  Header file for instruction decoding logic.
36 *
37 ****************************************************************************/
38 
39 #ifndef __X86EMU_DECODE_H
40 #define __X86EMU_DECODE_H
41 
42 /*---------------------- Macros and type definitions ----------------------*/
43 
44 /* Instruction Decoding Stuff */
45 
46 #define FETCH_DECODE_MODRM(mod,rh,rl)   fetch_decode_modrm(&mod,&rh,&rl)
47 #define DECODE_RM_BYTE_REGISTER(r)      decode_rm_byte_register(r)
48 #define DECODE_RM_WORD_REGISTER(r)      decode_rm_word_register(r)
49 #define DECODE_RM_LONG_REGISTER(r)      decode_rm_long_register(r)
50 #define DECODE_CLEAR_SEGOVR()           M.x86.mode &= ~SYSMODE_CLRMASK
51 
52 /*-------------------------- Function Prototypes --------------------------*/
53 
54 #ifdef  __cplusplus
55 extern "C" {                        /* Use "C" linkage when in C++ mode */
56 #endif
57 
58 void    x86emu_intr_raise (u8 type);
59 void    fetch_decode_modrm (int *mod,int *regh,int *regl);
60 u8      fetch_byte_imm (void);
61 u16     fetch_word_imm (void);
62 u32     fetch_long_imm (void);
63 u8      fetch_data_byte (uint offset);
64 u8      fetch_data_byte_abs (uint segment, uint offset);
65 u16     fetch_data_word (uint offset);
66 u16     fetch_data_word_abs (uint segment, uint offset);
67 u32     fetch_data_long (uint offset);
68 u32     fetch_data_long_abs (uint segment, uint offset);
69 void    store_data_byte (uint offset, u8 val);
70 void    store_data_byte_abs (uint segment, uint offset, u8 val);
71 void    store_data_word (uint offset, u16 val);
72 void    store_data_word_abs (uint segment, uint offset, u16 val);
73 void    store_data_long (uint offset, u32 val);
74 void    store_data_long_abs (uint segment, uint offset, u32 val);
75 u8*     decode_rm_byte_register(int reg);
76 u16*    decode_rm_word_register(int reg);
77 u32*    decode_rm_long_register(int reg);
78 u16*    decode_rm_seg_register(int reg);
79 unsigned decode_rm00_address(int rm);
80 unsigned decode_rm01_address(int rm);
81 unsigned decode_rm10_address(int rm);
82 unsigned decode_rmXX_address(int mod, int rm);
83 
84 #ifdef  __cplusplus
85 }                                   /* End of "C" linkage for C++       */
86 #endif
87 
88 #endif /* __X86EMU_DECODE_H */
89