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[/] [or1k_old/] [trunk/] [gdb-5.3/] [include/] [floatformat.h] - Blame information for rev 1782

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1 1181 sfurman
/* IEEE floating point support declarations, for GDB, the GNU Debugger.
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   Copyright 1991, 1994, 1995, 1997, 2000 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
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#if !defined (FLOATFORMAT_H)
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#define FLOATFORMAT_H 1
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#include "ansidecl.h"
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/* A floatformat consists of a sign bit, an exponent and a mantissa.  Once the
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   bytes are concatenated according to the byteorder flag, then each of those
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   fields is contiguous.  We number the bits with 0 being the most significant
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   (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
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   contains with the *_start and *_len fields.  */
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/* What is the order of the bytes. */
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enum floatformat_byteorders {
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  /* Standard little endian byte order.
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     EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
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  floatformat_little,
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  /* Standard big endian byte order.
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     EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
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  floatformat_big,
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  /* Little endian byte order but big endian word order.
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     EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
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  floatformat_littlebyte_bigword
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};
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enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
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struct floatformat
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{
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  enum floatformat_byteorders byteorder;
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  unsigned int totalsize;       /* Total size of number in bits */
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  /* Sign bit is always one bit long.  1 means negative, 0 means positive.  */
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  unsigned int sign_start;
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  unsigned int exp_start;
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  unsigned int exp_len;
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  /* Amount added to "true" exponent.  0x3fff for many IEEE extendeds.  */
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  unsigned int exp_bias;
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  /* Exponent value which indicates NaN.  This is the actual value stored in
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     the float, not adjusted by the exp_bias.  This usually consists of all
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     one bits.  */
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  unsigned int exp_nan;
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  unsigned int man_start;
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  unsigned int man_len;
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  /* Is the integer bit explicit or implicit?  */
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  enum floatformat_intbit intbit;
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  /* Internal name for debugging. */
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  const char *name;
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};
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/* floatformats for IEEE single and double, big and little endian.  */
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extern const struct floatformat floatformat_ieee_single_big;
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extern const struct floatformat floatformat_ieee_single_little;
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extern const struct floatformat floatformat_ieee_double_big;
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extern const struct floatformat floatformat_ieee_double_little;
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/* floatformat for ARM IEEE double, little endian bytes and big endian words */
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extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
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/* floatformats for various extendeds.  */
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extern const struct floatformat floatformat_i387_ext;
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extern const struct floatformat floatformat_m68881_ext;
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extern const struct floatformat floatformat_i960_ext;
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extern const struct floatformat floatformat_m88110_ext;
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extern const struct floatformat floatformat_m88110_harris_ext;
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extern const struct floatformat floatformat_arm_ext_big;
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extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
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/* IA-64 Floating Point register spilt into memory.  */
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extern const struct floatformat floatformat_ia64_spill_big;
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extern const struct floatformat floatformat_ia64_spill_little;
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extern const struct floatformat floatformat_ia64_quad_big;
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extern const struct floatformat floatformat_ia64_quad_little;
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/* Convert from FMT to a double.
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   FROM is the address of the extended float.
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   Store the double in *TO.  */
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extern void
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floatformat_to_double PARAMS ((const struct floatformat *, char *, double *));
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/* The converse: convert the double *FROM to FMT
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   and store where TO points.  */
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extern void
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floatformat_from_double PARAMS ((const struct floatformat *,
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                                 double *, char *));
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#endif  /* defined (FLOATFORMAT_H) */

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