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 /* Parameters for extended float format:  */
  21
  22 struct ext_format {
  23   unsigned totalsize;           /* Total size of extended number */
  24   unsigned signbyte;            /* Byte number of sign bit */
  25   unsigned char signmask;       /* Mask for sign bit */
  26   unsigned expbyte_h;           /* High byte of exponent */
  27   unsigned expbyte_l;           /* Low  byte of exponent */
  28   unsigned manbyte_h;           /* High byte of mantissa */
  29   unsigned manbyte_l;           /* Low  byte of mantissa */
  30 };
  31
  32 #define TOTALSIZE       ext_format->totalsize
  33 #define SIGNBYTE        ext_format->signbyte
  34 #define SIGNMASK        ext_format->signmask
  35 #define EXPBYTE_H       ext_format->expbyte_h
  36 #define EXPBYTE_L       ext_format->expbyte_l
  37 #define MANBYTE_H       ext_format->manbyte_h
  38 #define MANBYTE_L       ext_format->manbyte_l
  39
  40 /* Actual ext_format structs for various machines are in the *-tdep.c file
  41    for each machine.  */
  42
  43 #define EXT_EXP_NAN     0x7FFF  /* Exponent value that indicates NaN */
  44 #define EXT_EXP_BIAS    0x3FFF  /* Amount added to "true" exponent for ext */
  45 #define DBL_EXP_BIAS     0x3FF  /* Ditto, for doubles */
  46
  47 /* Convert an IEEE extended float to a double.
  48    FROM is the address of the extended float.
  49    Store the double in *TO.  */
  50
  51 extern void
  52 ieee_extended_to_double (
  53 #ifdef __STDC__
  54         struct ext_format *ext_format, char *from, double *to
  55 #endif
  56 );
  57
  58 /* The converse: convert the double *FROM to an extended float
  59    and store where TO points.  */
  60
  61 void
  62 double_to_ieee_extended (
  63 #ifdef __STDC__
  64         struct ext_format *ext_format, double *from, char *to
  65 #endif
  66 );