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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) */