67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
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/* IEEE floating point support declarations, for GDB, the GNU Debugger.
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Copyright (C) 1991 Free Software Foundation, Inc.
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This file is part of GDB.
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GDB 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 1, or (at your option)
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any later version.
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GDB 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 GDB; see the file COPYING. If not, write to
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the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Parameters for extended float format: */
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struct ext_format {
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unsigned totalsize; /* Total size of extended number */
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unsigned signbyte; /* Byte number of sign bit */
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unsigned char signmask; /* Mask for sign bit */
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unsigned expbyte_h; /* High byte of exponent */
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unsigned expbyte_l; /* Low byte of exponent */
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unsigned manbyte_h; /* High byte of mantissa */
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unsigned manbyte_l; /* Low byte of mantissa */
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};
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#define TOTALSIZE ext_format->totalsize
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#define SIGNBYTE ext_format->signbyte
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#define SIGNMASK ext_format->signmask
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#define EXPBYTE_H ext_format->expbyte_h
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#define EXPBYTE_L ext_format->expbyte_l
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#define MANBYTE_H ext_format->manbyte_h
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#define MANBYTE_L ext_format->manbyte_l
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/* Actual ext_format structs for various machines are in the *-tdep.c file
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for each machine. */
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#define EXT_EXP_NAN 0x7FFF /* Exponent value that indicates NaN */
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#define EXT_EXP_BIAS 0x3FFF /* Amount added to "true" exponent for ext */
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#define DBL_EXP_BIAS 0x3FF /* Ditto, for doubles */
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/* Convert an IEEE extended float 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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ieee_extended_to_double (
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#ifdef __STDC__
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struct ext_format *ext_format, char *from, double *to
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#endif
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);
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/* The converse: convert the double *FROM to an extended float
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and store where TO points. */
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void
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double_to_ieee_extended (
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#ifdef __STDC__
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struct ext_format *ext_format, double *from, char *to
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#endif
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);
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