gdb/ieee-float.h

   1 /* IEEE floating point support declarations, for GDB, the GNU Debugger.
   2    Copyright (C) 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #if !defined (IEEE_FLOAT_H)
  21 #define IEEE_FLOAT_H 1
  22
  23 /* Parameters for extended float format:  */
  24
  25 struct ext_format {
  26   unsigned totalsize;           /* Total size of extended number */
  27   unsigned signbyte;            /* Byte number of sign bit */
  28   unsigned char signmask;       /* Mask for sign bit */
  29   unsigned expbyte_h;           /* High byte of exponent */
  30   unsigned expbyte_l;           /* Low  byte of exponent */
  31   unsigned manbyte_h;           /* High byte of mantissa */
  32   unsigned manbyte_l;           /* Low  byte of mantissa */
  33 };
  34
  35 #define TOTALSIZE       ext_format->totalsize
  36 #define SIGNBYTE        ext_format->signbyte
  37 #define SIGNMASK        ext_format->signmask
  38 #define EXPBYTE_H       ext_format->expbyte_h
  39 #define EXPBYTE_L       ext_format->expbyte_l
  40 #define MANBYTE_H       ext_format->manbyte_h
  41 #define MANBYTE_L       ext_format->manbyte_l
  42
  43 /* Actual ext_format structs for various machines are in the *-tdep.c file
  44    for each machine.  */
  45
  46 #define EXT_EXP_NAN     0x7FFF  /* Exponent value that indicates NaN */
  47 #define EXT_EXP_BIAS    0x3FFF  /* Amount added to "true" exponent for ext */
  48 #define DBL_EXP_BIAS     0x3FF  /* Ditto, for doubles */
  49
  50 /* Convert an IEEE extended float to a double.
  51    FROM is the address of the extended float.
  52    Store the double in *TO.  */
  53
  54 extern void
  55 ieee_extended_to_double PARAMS ((const struct ext_format *, char *, double *));
  56
  57 /* The converse: convert the double *FROM to an extended float
  58    and store where TO points.  */
  59
  60 extern void
  61 double_to_ieee_extended PARAMS ((const struct ext_format *, double *, char *));
  62
  63 #endif  /* defined (IEEE_FLOAT_H) */