| 1 | /****************************************************************************
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| 2 | *
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| 3 | * Realmode X86 Emulator Library
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| 4 | *
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| 5 | * Copyright (C) 1996-1999 SciTech Software, Inc.
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| 6 | * Copyright (C) David Mosberger-Tang
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| 7 | * Copyright (C) 1999 Egbert Eich
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| 8 | *
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| 9 | * ========================================================================
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| 10 | *
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| 11 | * Permission to use, copy, modify, distribute, and sell this software and
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| 12 | * its documentation for any purpose is hereby granted without fee,
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| 13 | * provided that the above copyright notice appear in all copies and that
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| 14 | * both that copyright notice and this permission notice appear in
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| 15 | * supporting documentation, and that the name of the authors not be used
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| 16 | * in advertising or publicity pertaining to distribution of the software
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| 17 | * without specific, written prior permission. The authors makes no
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| 18 | * representations about the suitability of this software for any purpose.
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| 19 | * It is provided "as is" without express or implied warranty.
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| 20 | *
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| 21 | * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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| 22 | * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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| 23 | * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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| 24 | * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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| 25 | * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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| 26 | * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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| 27 | * PERFORMANCE OF THIS SOFTWARE.
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| 28 | *
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| 29 | * ========================================================================
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| 30 | *
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| 31 | * Language: ANSI C
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| 32 | * Environment: Any
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| 33 | * Developer: Kendall Bennett
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| 34 | *
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| 35 | * Description: Header file for FPU register definitions.
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| 36 | *
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| 37 | ****************************************************************************/
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| 38 |
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| 39 | #ifndef __X86EMU_FPU_REGS_H
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| 40 | #define __X86EMU_FPU_REGS_H
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| 41 |
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| 42 | #ifdef X86_FPU_SUPPORT
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| 43 |
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| 44 | #ifdef PACK
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| 45 | # pragma PACK
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| 46 | #endif
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| 47 |
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| 48 | /* Basic 8087 register can hold any of the following values: */
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| 49 |
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| 50 | union x86_fpu_reg_u {
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| 51 | s8 tenbytes[10];
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| 52 | double dval;
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| 53 | float fval;
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| 54 | s16 sval;
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| 55 | s32 lval;
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| 56 | };
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| 57 |
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| 58 | struct x86_fpu_reg {
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| 59 | union x86_fpu_reg_u reg;
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| 60 | char tag;
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| 61 | };
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| 62 |
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| 63 | /*
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| 64 | * Since we are not going to worry about the problems of aliasing
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| 65 | * registers, every time a register is modified, its result type is
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| 66 | * set in the tag fields for that register. If some operation
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| 67 | * attempts to access the type in a way inconsistent with its current
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| 68 | * storage format, then we flag the operation. If common, we'll
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| 69 | * attempt the conversion.
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| 70 | */
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| 71 |
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| 72 | #define X86_FPU_VALID 0x80
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| 73 | #define X86_FPU_REGTYP(r) ((r) & 0x7F)
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| 74 |
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| 75 | #define X86_FPU_WORD 0x0
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| 76 | #define X86_FPU_SHORT 0x1
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| 77 | #define X86_FPU_LONG 0x2
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| 78 | #define X86_FPU_FLOAT 0x3
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| 79 | #define X86_FPU_DOUBLE 0x4
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| 80 | #define X86_FPU_LDBL 0x5
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| 81 | #define X86_FPU_BSD 0x6
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| 82 |
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| 83 | #define X86_FPU_STKTOP 0
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| 84 |
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| 85 | struct x86_fpu_registers {
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| 86 | struct x86_fpu_reg x86_fpu_stack[8];
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| 87 | int x86_fpu_flags;
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| 88 | int x86_fpu_config; /* rounding modes, etc. */
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| 89 | short x86_fpu_tos, x86_fpu_bos;
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| 90 | };
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| 91 |
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| 92 | #ifdef END_PACK
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| 93 | # pragma END_PACK
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| 94 | #endif
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| 95 |
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| 96 | /*
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| 97 | * There are two versions of the following macro.
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| 98 | *
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| 99 | * One version is for opcode D9, for which there are more than 32
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| 100 | * instructions encoded in the second byte of the opcode.
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| 101 | *
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| 102 | * The other version, deals with all the other 7 i87 opcodes, for
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| 103 | * which there are only 32 strings needed to describe the
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| 104 | * instructions.
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| 105 | */
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| 106 |
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| 107 | #endif /* X86_FPU_SUPPORT */
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| 108 |
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| 109 | #ifdef DEBUG
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| 110 | # define DECODE_PRINTINSTR32(t,mod,rh,rl) \
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| 111 | DECODE_PRINTF(t[(mod<<3)+(rh)]);
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| 112 | # define DECODE_PRINTINSTR256(t,mod,rh,rl) \
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| 113 | DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);
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| 114 | #else
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| 115 | # define DECODE_PRINTINSTR32(t,mod,rh,rl)
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| 116 | # define DECODE_PRINTINSTR256(t,mod,rh,rl)
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| 117 | #endif
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| 118 |
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| 119 | #endif /* __X86EMU_FPU_REGS_H */
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