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 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