osfmk/mach/i386/fp_reg.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * HISTORY
  27  *
  28  * Revision 1.1.1.1  1998/09/22 21:05:31  wsanchez
  29  * Import of Mac OS X kernel (~semeria)
  30  *
  31  * Revision 1.1.1.1  1998/03/07 02:25:47  wsanchez
  32  * Import of OSF Mach kernel (~mburg)
  33  *
  34  * Revision 1.2.6.1  1994/09/23  02:37:03  ezf
  35  *      change marker to not FREE
  36  *      [1994/09/22  21:39:57  ezf]
  37  *
  38  * Revision 1.2.2.2  1993/06/09  02:40:30  gm
  39  *      Added to OSF/1 R1.3 from NMK15.0.
  40  *      [1993/06/02  21:16:11  jeffc]
  41  *
  42  * Revision 1.2  1993/04/19  16:33:51  devrcs
  43  *      ansi C conformance changes
  44  *      [1993/02/02  18:56:01  david]
  45  *
  46  * Revision 1.1  1992/09/30  02:30:43  robert
  47  *      Initial revision
  48  *
  49  * $EndLog$
  50  */
  51 /* CMU_HIST */
  52 /*
  53  * Revision 2.1.1.1.2.1  92/03/03  16:21:23  jeffreyh
  54  *      Merged up to Trunk
  55  *      [92/02/26            jeffreyh]
  56  *
  57  * Revision 2.4  92/02/26  13:10:29  elf
  58  *      Added stupid alaises to make i386/fpu.c compile. RVB will fix.
  59  *
  60  *      [92/02/26            elf]
  61  *
  62  * Revision 2.3  92/02/26  12:47:46  elf
  63  *      Installed from i386 directory.
  64  *      [92/02/26            danner]
  65  *
  66  *
  67  * Revision 2.2  92/01/03  20:19:47  dbg
  68  *      Move this file to mach/i386.  Add FP_NO..FP_387 codes for
  69  *      floating-point processor status.  Error bits in control
  70  *      register are masks, not enables.
  71  *      [91/10/19            dbg]
  72  *
  73  */
  74 /* CMU_ENDHIST */
  75 /*
  76  * Mach Operating System
  77  * Copyright (c) 1992-1989 Carnegie Mellon University
  78  * All Rights Reserved.
  79  *
  80  * Permission to use, copy, modify and distribute this software and its
  81  * documentation is hereby granted, provided that both the copyright
  82  * notice and this permission notice appear in all copies of the
  83  * software, derivative works or modified versions, and any portions
  84  * thereof, and that both notices appear in supporting documentation.
  85  *
  86  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  87  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  88  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  89  *
  90  * Carnegie Mellon requests users of this software to return to
  91  *
  92  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  93  *  School of Computer Science
  94  *  Carnegie Mellon University
  95  *  Pittsburgh PA 15213-3890
  96  *
  97  * any improvements or extensions that they make and grant Carnegie Mellon
  98  * the rights to redistribute these changes.
  99  */
 100 /*
 101  */
 102
 103 #ifndef _I386_FP_SAVE_H_
 104 #define _I386_FP_SAVE_H_
 105 /*
 106  *      Floating point registers and status, as saved
 107  *      and restored by FP save/restore instructions.
 108  */
 109 struct i386_fp_save     {
 110         unsigned short  fp_control;     /* control */
 111         unsigned short  fp_unused_1;
 112         unsigned short  fp_status;      /* status */
 113         unsigned short  fp_unused_2;
 114         unsigned short  fp_tag;         /* register tags */
 115         unsigned short  fp_unused_3;
 116         unsigned int    fp_eip;         /* eip at failed instruction */
 117         unsigned short  fp_cs;          /* cs at failed instruction */
 118         unsigned short  fp_opcode;      /* opcode of failed instruction */
 119         unsigned int    fp_dp;          /* data address */
 120         unsigned short  fp_ds;          /* data segment */
 121         unsigned short  fp_unused_4;
 122 };
 123
 124 struct i386_fp_regs {
 125         unsigned short  fp_reg_word[5][8];
 126                                         /* space for 8 80-bit FP registers */
 127 };
 128
 129 /*
 130  * Control register
 131  */
 132 #define FPC_IE          0x0001          /* enable invalid operation
 133                                            exception */
 134 #define FPC_IM          FPC_IE
 135 #define FPC_DE          0x0002          /* enable denormalized operation
 136                                            exception */
 137 #define FPC_DM          FPC_DE
 138 #define FPC_ZE          0x0004          /* enable zero-divide exception */
 139 #define FPC_ZM          FPC_ZE
 140 #define FPC_OE          0x0008          /* enable overflow exception */
 141 #define FPC_OM          FPC_OE
 142 #define FPC_UE          0x0010          /* enable underflow exception */
 143 #define FPC_PE          0x0020          /* enable precision exception */
 144 #define FPC_PC          0x0300          /* precision control: */
 145 #define FPC_PC_24       0x0000                  /* 24 bits */
 146 #define FPC_PC_53       0x0200                  /* 53 bits */
 147 #define FPC_PC_64       0x0300                  /* 64 bits */
 148 #define FPC_RC          0x0c00          /* rounding control: */
 149 #define FPC_RC_RN       0x0000                  /* round to nearest or even */
 150 #define FPC_RC_RD       0x0400                  /* round down */
 151 #define FPC_RC_RU       0x0800                  /* round up */
 152 #define FPC_RC_CHOP     0x0c00                  /* chop */
 153 #define FPC_IC          0x1000          /* infinity control (obsolete) */
 154 #define FPC_IC_PROJ     0x0000                  /* projective infinity */
 155 #define FPC_IC_AFF      0x1000                  /* affine infinity (std) */
 156
 157 /*
 158  * Status register
 159  */
 160 #define FPS_IE          0x0001          /* invalid operation */
 161 #define FPS_DE          0x0002          /* denormalized operand */
 162 #define FPS_ZE          0x0004          /* divide by zero */
 163 #define FPS_OE          0x0008          /* overflow */
 164 #define FPS_UE          0x0010          /* underflow */
 165 #define FPS_PE          0x0020          /* precision */
 166 #define FPS_SF          0x0040          /* stack flag */
 167 #define FPS_ES          0x0080          /* error summary */
 168 #define FPS_C0          0x0100          /* condition code bit 0 */
 169 #define FPS_C1          0x0200          /* condition code bit 1 */
 170 #define FPS_C2          0x0400          /* condition code bit 2 */
 171 #define FPS_TOS         0x3800          /* top-of-stack pointer */
 172 #define FPS_TOS_SHIFT   11
 173 #define FPS_C3          0x4000          /* condition code bit 3 */
 174 #define FPS_BUSY        0x8000          /* FPU busy */
 175
 176 /*
 177  * Kind of floating-point support provided by kernel.
 178  */
 179 #define FP_NO           0               /* no floating point */
 180 #define FP_SOFT         1               /* software FP emulator */
 181 #define FP_287          2               /* 80287 */
 182 #define FP_387          3               /* 80387 or 80486 */
 183
 184 #endif  /* _I386_FP_SAVE_H_ */