libhd  5.0
fpu_regs.h
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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 /* $XFree86: xc/extras/x86emu/include/x86emu/fpu_regs.h,v 1.2 2003/10/22 20:03:05 tsi Exp $ */
39 
40 #ifndef __X86EMU_FPU_REGS_H
41 #define __X86EMU_FPU_REGS_H
42 
43 #ifdef X86_FPU_SUPPORT
44 
45 #ifdef PACK
46 # pragma PACK
47 #endif
48 
49 /* Basic 8087 register can hold any of the following values: */
50 
51 union x86_fpu_reg_u {
52  s8 tenbytes[10];
53  double dval;
54  float fval;
55  s16 sval;
56  s32 lval;
57  };
58 
59 struct x86_fpu_reg {
60  union x86_fpu_reg_u reg;
61  char tag;
62  };
63 
64 /*
65  * Since we are not going to worry about the problems of aliasing
66  * registers, every time a register is modified, its result type is
67  * set in the tag fields for that register. If some operation
68  * attempts to access the type in a way inconsistent with its current
69  * storage format, then we flag the operation. If common, we'll
70  * attempt the conversion.
71  */
72 
73 #define X86_FPU_VALID 0x80
74 #define X86_FPU_REGTYP(r) ((r) & 0x7F)
75 
76 #define X86_FPU_WORD 0x0
77 #define X86_FPU_SHORT 0x1
78 #define X86_FPU_LONG 0x2
79 #define X86_FPU_FLOAT 0x3
80 #define X86_FPU_DOUBLE 0x4
81 #define X86_FPU_LDBL 0x5
82 #define X86_FPU_BSD 0x6
83 
84 #define X86_FPU_STKTOP 0
85 
86 struct x86_fpu_registers {
87  struct x86_fpu_reg x86_fpu_stack[8];
88  int x86_fpu_flags;
89  int x86_fpu_config; /* rounding modes, etc. */
90  short x86_fpu_tos, x86_fpu_bos;
91  };
92 
93 #ifdef END_PACK
94 # pragma END_PACK
95 #endif
96 
97 /*
98  * There are two versions of the following macro.
99  *
100  * One version is for opcode D9, for which there are more than 32
101  * instructions encoded in the second byte of the opcode.
102  *
103  * The other version, deals with all the other 7 i87 opcodes, for
104  * which there are only 32 strings needed to describe the
105  * instructions.
106  */
107 
108 #endif /* X86_FPU_SUPPORT */
109 
110 #ifdef DEBUG
111 # define DECODE_PRINTINSTR32(t,mod,rh,rl) \
112  DECODE_PRINTF(t[(mod<<3)+(rh)]);
113 # define DECODE_PRINTINSTR256(t,mod,rh,rl) \
114  DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);
115 #else
116 # define DECODE_PRINTINSTR32(t,mod,rh,rl)
117 # define DECODE_PRINTINSTR256(t,mod,rh,rl)
118 #endif
119 
120 #endif /* __X86EMU_FPU_REGS_H */