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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
commit252b5132c753830d5fd56823373aed85f2a0db63 (patch)
tree1af963bfd8d3e55167b81def4207f175eaff3a56 /include/floatformat.h
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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) */