1 /****************************************************************************
2 *
3 *						Realmode X86 Emulator Library
4 *
5 *            	Copyright (C) 1996-1999 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 FPU register definitions.
36 *
37 ****************************************************************************/
38 
39 #ifndef __X86EMU_FPU_REGS_H
40 #define __X86EMU_FPU_REGS_H
41 
42 #ifdef X86_FPU_SUPPORT
43 
44 /* Basic 8087 register can hold any of the following values: */
45 
46 union x86_fpu_reg_u {
47     s8                  tenbytes[10];
48     double              dval;
49     float               fval;
50     s16                 sval;
51     s32                 lval;
52 	};
53 
54 struct x86_fpu_reg {
55 	union x86_fpu_reg_u reg;
56 	char                tag;
57 	};
58 
59 /*
60  * Since we are not going to worry about the problems of aliasing
61  * registers, every time a register is modified, its result type is
62  * set in the tag fields for that register.  If some operation
63  * attempts to access the type in a way inconsistent with its current
64  * storage format, then we flag the operation.  If common, we'll
65  * attempt the conversion.
66  */
67 
68 #define  X86_FPU_VALID          0x80
69 #define  X86_FPU_REGTYP(r)      ((r) & 0x7F)
70 
71 #define  X86_FPU_WORD           0x0
72 #define  X86_FPU_SHORT          0x1
73 #define  X86_FPU_LONG           0x2
74 #define  X86_FPU_FLOAT          0x3
75 #define  X86_FPU_DOUBLE         0x4
76 #define  X86_FPU_LDBL           0x5
77 #define  X86_FPU_BSD            0x6
78 
79 #define  X86_FPU_STKTOP  0
80 
81 struct x86_fpu_registers {
82     struct x86_fpu_reg  x86_fpu_stack[8];
83     int                 x86_fpu_flags;
84     int                 x86_fpu_config;         /* rounding modes, etc. */
85     short               x86_fpu_tos, x86_fpu_bos;
86 	};
87 
88 /*
89  * There are two versions of the following macro.
90  *
91  * One version is for opcode D9, for which there are more than 32
92  * instructions encoded in the second byte of the opcode.
93  *
94  * The other version, deals with all the other 7 i87 opcodes, for
95  * which there are only 32 strings needed to describe the
96  * instructions.
97  */
98 
99 #endif /* X86_FPU_SUPPORT */
100 
101 #ifdef DEBUG
102 # define DECODE_PRINTINSTR32(t,mod,rh,rl)     	\
103 	DECODE_PRINTF(t[(mod<<3)+(rh)]);
104 # define DECODE_PRINTINSTR256(t,mod,rh,rl)    	\
105 	DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);
106 #else
107 # define DECODE_PRINTINSTR32(t,mod,rh,rl)
108 # define DECODE_PRINTINSTR256(t,mod,rh,rl)
109 #endif
110 
111 #endif /* __X86EMU_FPU_REGS_H */
112