?? fpu_regs.h
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/****************************************************************************** Realmode X86 Emulator Library** Copyright (C) 1996-1999 SciTech Software, Inc.* Copyright (C) David Mosberger-Tang* Copyright (C) 1999 Egbert Eich** ========================================================================** Permission to use, copy, modify, distribute, and sell this software and* its documentation for any purpose is hereby granted without fee,* provided that the above copyright notice appear in all copies and that* both that copyright notice and this permission notice appear in* supporting documentation, and that the name of the authors not be used* in advertising or publicity pertaining to distribution of the software* without specific, written prior permission. The authors makes no* representations about the suitability of this software for any purpose.* It is provided "as is" without express or implied warranty.** THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR* PERFORMANCE OF THIS SOFTWARE.** ========================================================================** Language: ANSI C* Environment: Any* Developer: Kendall Bennett** Description: Header file for FPU register definitions.*****************************************************************************/#ifndef __X86EMU_FPU_REGS_H#define __X86EMU_FPU_REGS_H#ifdef X86_FPU_SUPPORT#pragma pack(1)/* Basic 8087 register can hold any of the following values: */union x86_fpu_reg_u { s8 tenbytes[10]; double dval; float fval; s16 sval; s32 lval; };struct x86_fpu_reg { union x86_fpu_reg_u reg; char tag; };/* * Since we are not going to worry about the problems of aliasing * registers, every time a register is modified, its result type is * set in the tag fields for that register. If some operation * attempts to access the type in a way inconsistent with its current * storage format, then we flag the operation. If common, we'll * attempt the conversion. */#define X86_FPU_VALID 0x80#define X86_FPU_REGTYP(r) ((r) & 0x7F)#define X86_FPU_WORD 0x0#define X86_FPU_SHORT 0x1#define X86_FPU_LONG 0x2#define X86_FPU_FLOAT 0x3#define X86_FPU_DOUBLE 0x4#define X86_FPU_LDBL 0x5#define X86_FPU_BSD 0x6#define X86_FPU_STKTOP 0struct x86_fpu_registers { struct x86_fpu_reg x86_fpu_stack[8]; int x86_fpu_flags; int x86_fpu_config; /* rounding modes, etc. */ short x86_fpu_tos, x86_fpu_bos; };#pragma pack()/* * There are two versions of the following macro. * * One version is for opcode D9, for which there are more than 32 * instructions encoded in the second byte of the opcode. * * The other version, deals with all the other 7 i87 opcodes, for * which there are only 32 strings needed to describe the * instructions. */#endif /* X86_FPU_SUPPORT */#ifdef DEBUG# define DECODE_PRINTINSTR32(t,mod,rh,rl) \ DECODE_PRINTF(t[(mod<<3)+(rh)]);# define DECODE_PRINTINSTR256(t,mod,rh,rl) \ DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]);#else# define DECODE_PRINTINSTR32(t,mod,rh,rl)# define DECODE_PRINTINSTR256(t,mod,rh,rl)#endif#endif /* __X86EMU_FPU_REGS_H */
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