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/* IEEE floating point support declarations, for GDB, the GNU Debugger.

   Copyright (C) 1991 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#if !defined (FLOATFORMAT_H)

#define FLOATFORMAT_H 1

#include "ansidecl.h"

/* A floatformat consists of a sign bit, an exponent and a mantissa.  Once the

   bytes are concatenated according to the byteorder flag, then each of those

   fields is contiguous.  We number the bits with 0 being the most significant

   (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field

   contains with the *_start and *_len fields.  */

/* What is the order of the bytes. */

enum floatformat_byteorders {

  /* Standard little endian byte order.

     EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */

  floatformat_little,

  /* Standard big endian byte order.

     EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */

  floatformat_big,

  /* Little endian byte order but big endian word order.

     EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */

  floatformat_littlebyte_bigword

};

enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };

struct floatformat

{

  enum floatformat_byteorders byteorder;

  unsigned int totalsize;       /* Total size of number in bits */

  /* Sign bit is always one bit long.  1 means negative, 0 means positive.  */

  unsigned int sign_start;

  unsigned int exp_start;

  unsigned int exp_len;

  /* Amount added to "true" exponent.  0x3fff for many IEEE extendeds.  */

  unsigned int exp_bias;

  /* Exponent value which indicates NaN.  This is the actual value stored in

     the float, not adjusted by the exp_bias.  This usually consists of all

     one bits.  */

  unsigned int exp_nan;

  unsigned int man_start;

  unsigned int man_len;

  /* Is the integer bit explicit or implicit?  */

  enum floatformat_intbit intbit;

};

/* floatformats for IEEE single and double, big and little endian.  */

extern const struct floatformat floatformat_ieee_single_big;

extern const struct floatformat floatformat_ieee_single_little;

extern const struct floatformat floatformat_ieee_double_big;

extern const struct floatformat floatformat_ieee_double_little;

/* floatformat for ARM IEEE double, little endian bytes and big endian words */

extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;

/* floatformats for various extendeds.  */

extern const struct floatformat floatformat_i387_ext;

extern const struct floatformat floatformat_m68881_ext;

extern const struct floatformat floatformat_i960_ext;

extern const struct floatformat floatformat_m88110_ext;

extern const struct floatformat floatformat_arm_ext;

/* Convert from FMT to a double.

   FROM is the address of the extended float.

   Store the double in *TO.  */

extern void

floatformat_to_double PARAMS ((const struct floatformat *, char *, double *));

/* The converse: convert the double *FROM to FMT

   and store where TO points.  */

extern void

floatformat_from_double PARAMS ((const struct floatformat *,

                                 double *, char *));

#endif  /* defined (FLOATFORMAT_H) */