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[binutils.git] / include / floatformat.h
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1 /* IEEE floating point support declarations, for GDB, the GNU Debugger.
2 Copyright 1991, 1994, 1995, 1997, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 #if !defined (FLOATFORMAT_H)
21 #define FLOATFORMAT_H 1
23 #include "ansidecl.h"
25 /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
26 bytes are concatenated according to the byteorder flag, then each of those
27 fields is contiguous. We number the bits with 0 being the most significant
28 (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
29 contains with the *_start and *_len fields. */
31 /* What is the order of the bytes. */
33 enum floatformat_byteorders {
35 /* Standard little endian byte order.
36 EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
38 floatformat_little,
40 /* Standard big endian byte order.
41 EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
43 floatformat_big,
45 /* Little endian byte order but big endian word order.
46 EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
48 floatformat_littlebyte_bigword
52 enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
54 struct floatformat
56 enum floatformat_byteorders byteorder;
57 unsigned int totalsize; /* Total size of number in bits */
59 /* Sign bit is always one bit long. 1 means negative, 0 means positive. */
60 unsigned int sign_start;
62 unsigned int exp_start;
63 unsigned int exp_len;
64 /* Amount added to "true" exponent. 0x3fff for many IEEE extendeds. */
65 unsigned int exp_bias;
66 /* Exponent value which indicates NaN. This is the actual value stored in
67 the float, not adjusted by the exp_bias. This usually consists of all
68 one bits. */
69 unsigned int exp_nan;
71 unsigned int man_start;
72 unsigned int man_len;
74 /* Is the integer bit explicit or implicit? */
75 enum floatformat_intbit intbit;
77 /* Internal name for debugging. */
78 const char *name;
81 /* floatformats for IEEE single and double, big and little endian. */
83 extern const struct floatformat floatformat_ieee_single_big;
84 extern const struct floatformat floatformat_ieee_single_little;
85 extern const struct floatformat floatformat_ieee_double_big;
86 extern const struct floatformat floatformat_ieee_double_little;
88 /* floatformat for ARM IEEE double, little endian bytes and big endian words */
90 extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
92 /* floatformats for various extendeds. */
94 extern const struct floatformat floatformat_i387_ext;
95 extern const struct floatformat floatformat_m68881_ext;
96 extern const struct floatformat floatformat_i960_ext;
97 extern const struct floatformat floatformat_m88110_ext;
98 extern const struct floatformat floatformat_m88110_harris_ext;
99 extern const struct floatformat floatformat_arm_ext_big;
100 extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
101 /* IA-64 Floating Point register spilt into memory. */
102 extern const struct floatformat floatformat_ia64_spill_big;
103 extern const struct floatformat floatformat_ia64_spill_little;
104 extern const struct floatformat floatformat_ia64_quad_big;
105 extern const struct floatformat floatformat_ia64_quad_little;
107 /* Convert from FMT to a double.
108 FROM is the address of the extended float.
109 Store the double in *TO. */
111 extern void
112 floatformat_to_double PARAMS ((const struct floatformat *, char *, double *));
114 /* The converse: convert the double *FROM to FMT
115 and store where TO points. */
117 extern void
118 floatformat_from_double PARAMS ((const struct floatformat *,
119 double *, char *));
121 #endif /* defined (FLOATFORMAT_H) */