hw/xfree86/x86emu/x86emu/fpu_regs.h

   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 */