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lxdream.org :: lxdream/src/xlat/disasm/floatformat.h
lxdream 0.9.1
released Jun 29
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filename src/xlat/disasm/floatformat.h
changeset 1265:7c6c5d26fd2e
author nkeynes
date Tue Mar 06 12:42:33 2012 +1000 (8 years ago)
permissions -rw-r--r--
last change Merge ARM disassembler from binutils 2.22
file annotate diff log raw
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/* IEEE floating point support declarations, for GDB, the GNU Debugger.
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   Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005, 2010
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   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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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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  /* VAX byte order.  Little endian byte order with 16-bit words.  The
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     following example is an illustration of the byte order only; VAX
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     doesn't have a fully IEEE compliant floating-point format.
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     EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */
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  floatformat_vax
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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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  /* Bias added to a "true" exponent to form the biased exponent.  It
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     is intentionally signed as, otherwize, -exp_bias can turn into a
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     very large number (e.g., given the exp_bias of 0x3fff and a 64
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     bit long, the equation (long)(1 - exp_bias) evaluates to
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     4294950914) instead of -16382).  */
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  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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  /* Validator method.  */
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  int (*is_valid) (const struct floatformat *fmt, const void *from);
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  /* Is the format actually the sum of two smaller floating point
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     formats (IBM long double, as described in
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     gcc/config/rs6000/darwin-ldouble-format)?  If so, this is the
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     smaller format in question, and the fields sign_start through
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     intbit describe the first half.  If not, this is NULL.  */
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  const struct floatformat *split_half;
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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_half_big;
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extern const struct floatformat floatformat_ieee_half_little;
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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 VAX.  */
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extern const struct floatformat floatformat_vax_f;
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extern const struct floatformat floatformat_vax_d;
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extern const struct floatformat floatformat_vax_g;
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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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/* IBM long double (double+double).  */
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extern const struct floatformat floatformat_ibm_long_double;
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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 (const struct floatformat *, const void *, 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 (const struct floatformat *, const double *, void *);
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/* Return non-zero iff the data at FROM is a valid number in format FMT.  */
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extern int
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floatformat_is_valid (const struct floatformat *fmt, const void *from);
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#endif	/* defined (FLOATFORMAT_H) */
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