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1/* IEEE floating point support declarations, for GDB, the GNU Debugger.
2 Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005
3 Free Software Foundation, Inc.
4
5This file is part of GDB.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21#if !defined (FLOATFORMAT_H)
22#define FLOATFORMAT_H 1
23
24/*#include "ansidecl.h"*/
25
26/* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
27 bytes are concatenated according to the byteorder flag, then each of those
28 fields is contiguous. We number the bits with 0 being the most significant
29 (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
30 contains with the *_start and *_len fields. */
31
32/* What is the order of the bytes? */
33
34enum EXTRACTOR_floatformat_byteorders {
35 /* Standard little endian byte order.
36 EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
37 floatformat_little,
38
39 /* Standard big endian byte order.
40 EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
41 floatformat_big,
42
43 /* Little endian byte order but big endian word order.
44 EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
45 floatformat_littlebyte_bigword,
46
47 /* VAX byte order. Little endian byte order with 16-bit words. The
48 following example is an illustration of the byte order only; VAX
49 doesn't have a fully IEEE compliant floating-point format.
50 EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */
51 floatformat_vax
52};
53
54enum EXTRACTOR_floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
55
56struct EXTRACTOR_floatformat
57{
58 enum EXTRACTOR_floatformat_byteorders byteorder;
59 unsigned int totalsize; /* Total size of number in bits */
60
61 /* Sign bit is always one bit long. 1 means negative, 0 means positive. */
62 unsigned int sign_start;
63
64 unsigned int exp_start;
65 unsigned int exp_len;
66 /* Bias added to a "true" exponent to form the biased exponent. It
67 is intentionally signed as, otherwize, -exp_bias can turn into a
68 very large number (e.g., given the exp_bias of 0x3fff and a 64
69 bit long, the equation (long)(1 - exp_bias) evaluates to
70 4294950914) instead of -16382). */
71 int exp_bias;
72 /* Exponent value which indicates NaN. This is the actual value stored in
73 the float, not adjusted by the exp_bias. This usually consists of all
74 one bits. */
75 unsigned int exp_nan;
76
77 unsigned int man_start;
78 unsigned int man_len;
79
80 /* Is the integer bit explicit or implicit? */
81 enum EXTRACTOR_floatformat_intbit intbit;
82
83 /* Internal name for debugging. */
84 const char *name;
85
86 /* Validator method. */
87 int (*is_valid) (const struct EXTRACTOR_floatformat *fmt, const void *from);
88};
89
90/* floatformats for IEEE single and double, big and little endian. */
91
92extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_single_big;
93extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_single_little;
94extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_double_big;
95extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_double_little;
96
97/* floatformat for ARM IEEE double, little endian bytes and big endian words */
98
99extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_double_littlebyte_bigword;
100
101/* floatformats for VAX. */
102
103extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_vax_f;
104extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_vax_d;
105extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_vax_g;
106
107/* floatformats for various extendeds. */
108
109extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_i387_ext;
110extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_m68881_ext;
111extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_i960_ext;
112extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_m88110_ext;
113extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_m88110_harris_ext;
114extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_arm_ext_big;
115extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_arm_ext_littlebyte_bigword;
116/* IA-64 Floating Point register spilt into memory. */
117extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ia64_spill_big;
118extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ia64_spill_little;
119extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ia64_quad_big;
120extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ia64_quad_little;
121
122/* Convert from FMT to a double.
123 FROM is the address of the extended float.
124 Store the double in *TO. */
125
126extern void
127EXTRACTOR_common_floatformat_to_double (const struct EXTRACTOR_floatformat *, const void *, double *);
128
129/* The converse: convert the double *FROM to FMT
130 and store where TO points. */
131
132extern void
133EXTRACTOR_common_floatformat_from_double (const struct EXTRACTOR_floatformat *, const double *, void *);
134
135/* Return non-zero iff the data at FROM is a valid number in format FMT. */
136
137extern int
138EXTRACTOR_common_floatformat_is_valid (const struct EXTRACTOR_floatformat *fmt, const void *from);
139
140#endif /* defined (FLOATFORMAT_H) */
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