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 
50 union x86_fpu_reg_u {
51     s8                  tenbytes[10];
52     double              dval;
53     float               fval;
54     s16                 sval;
55     s32                 lval;
56         };
57 
58 struct 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 
85 struct 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 X86EMU_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