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 #pragma pack(1) 45 46 /* Basic 8087 register can hold any of the following values: */ 47 48 union x86_fpu_reg_u { 49 s8 tenbytes[10]; 50 double dval; 51 float fval; 52 s16 sval; 53 s32 lval; 54 }; 55 56 struct x86_fpu_reg { 57 union x86_fpu_reg_u reg; 58 char tag; 59 }; 60 61 /* 62 * Since we are not going to worry about the problems of aliasing 63 * registers, every time a register is modified, its result type is 64 * set in the tag fields for that register. If some operation 65 * attempts to access the type in a way inconsistent with its current 66 * storage format, then we flag the operation. If common, we'll 67 * attempt the conversion. 68 */ 69 70 #define X86_FPU_VALID 0x80 71 #define X86_FPU_REGTYP(r) ((r) & 0x7F) 72 73 #define X86_FPU_WORD 0x0 74 #define X86_FPU_SHORT 0x1 75 #define X86_FPU_LONG 0x2 76 #define X86_FPU_FLOAT 0x3 77 #define X86_FPU_DOUBLE 0x4 78 #define X86_FPU_LDBL 0x5 79 #define X86_FPU_BSD 0x6 80 81 #define X86_FPU_STKTOP 0 82 83 struct x86_fpu_registers { 84 struct x86_fpu_reg x86_fpu_stack[8]; 85 int x86_fpu_flags; 86 int x86_fpu_config; /* rounding modes, etc. */ 87 short x86_fpu_tos, x86_fpu_bos; 88 }; 89 90 #pragma pack() 91 92 /* 93 * There are two versions of the following macro. 94 * 95 * One version is for opcode D9, for which there are more than 32 96 * instructions encoded in the second byte of the opcode. 97 * 98 * The other version, deals with all the other 7 i87 opcodes, for 99 * which there are only 32 strings needed to describe the 100 * instructions. 101 */ 102 103 #endif /* X86_FPU_SUPPORT */ 104 105 #if CONFIG(X86EMU_DEBUG) 106 # define DECODE_PRINTINSTR32(t, mod, rh, rl) \ 107 DECODE_PRINTF(t[(mod<<3)+(rh)]) 108 # define DECODE_PRINTINSTR256(t, mod, rh, rl) \ 109 DECODE_PRINTF(t[(mod<<6)+(rh<<3)+(rl)]) 110 #else 111 # define DECODE_PRINTINSTR32(t, mod, rh, rl) 112 # define DECODE_PRINTINSTR256(t, mod, rh, rl) 113 #endif 114 115 #endif /* __X86EMU_FPU_REGS_H */ 116