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#ifdef PACK
45#pragma PACK
46#endif
47
48/* Basic 8087 register can hold any of the following values: */
49
50union x86_fpu_reg_u {
51    s8 tenbytes[10];
52    double dval;
53    float fval;
54    s16 sval;
55    s32 lval;
56};
57
58struct x86_fpu_reg {
59    union x86_fpu_reg_u reg;
60    char tag;
61};
62
63/*
64 * Since we are not going to worry about the problems of aliasing
65 * registers, every time a register is modified, its result type is
66 * set in the tag fields for that register.  If some operation
67 * attempts to access the type in a way inconsistent with its current
68 * storage format, then we flag the operation.  If common, we'll
69 * attempt the conversion.
70 */
71
72#define  X86_FPU_VALID          0x80
73#define  X86_FPU_REGTYP(r)      ((r) & 0x7F)
74
75#define  X86_FPU_WORD           0x0
76#define  X86_FPU_SHORT          0x1
77#define  X86_FPU_LONG           0x2
78#define  X86_FPU_FLOAT          0x3
79#define  X86_FPU_DOUBLE         0x4
80#define  X86_FPU_LDBL           0x5
81#define  X86_FPU_BSD            0x6
82
83#define  X86_FPU_STKTOP  0
84
85struct x86_fpu_registers {
86    struct x86_fpu_reg x86_fpu_stack[8];
87    int x86_fpu_flags;
88    int x86_fpu_config;         /* rounding modes, etc. */
89    short x86_fpu_tos, x86_fpu_bos;
90};
91
92#ifdef END_PACK
93#pragma END_PACK
94#endif
95
96/*
97 * There are two versions of the following macro.
98 *
99 * One version is for opcode D9, for which there are more than 32
100 * instructions encoded in the second byte of the opcode.
101 *
102 * The other version, deals with all the other 7 i87 opcodes, for
103 * which there are only 32 strings needed to describe the
104 * instructions.
105 */
106
107#endif                          /* X86_FPU_SUPPORT */
108
109#ifdef DEBUG
110#define DECODE_PRINTINSTR32(t,mod,rh,rl)     	\
111	DECODE_PRINTF(t[(mod<<3)+(rh)]);
112#define DECODE_PRINTINSTR256(t,mod,rh,rl)    	\
113	DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);
114#else
115#define DECODE_PRINTINSTR32(t,mod,rh,rl)
116#define DECODE_PRINTINSTR256(t,mod,rh,rl)
117#endif
118
119#endif                          /* __X86EMU_FPU_REGS_H */
120