Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* IEEE floating point support declarations, for GDB, the GNU Debugger. |
3b6940c0 DD |
2 | Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
e172dbf8 | 19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
252b5132 RH |
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 | ||
34 | enum floatformat_byteorders { | |
35 | ||
36 | /* Standard little endian byte order. | |
37 | EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ | |
38 | ||
39 | floatformat_little, | |
40 | ||
41 | /* Standard big endian byte order. | |
42 | EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ | |
43 | ||
44 | floatformat_big, | |
45 | ||
46 | /* Little endian byte order but big endian word order. | |
47 | EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ | |
48 | ||
49 | floatformat_littlebyte_bigword | |
50 | ||
51 | }; | |
52 | ||
53 | enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; | |
54 | ||
55 | struct floatformat | |
56 | { | |
57 | enum floatformat_byteorders byteorder; | |
58 | unsigned int totalsize; /* Total size of number in bits */ | |
59 | ||
60 | /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ | |
61 | unsigned int sign_start; | |
62 | ||
63 | unsigned int exp_start; | |
64 | unsigned int exp_len; | |
a58f1534 AC |
65 | /* Bias added to a "true" exponent to form the biased exponent. It |
66 | is intentionally signed as, otherwize, -exp_bias can turn into a | |
67 | very large number (e.g., given the exp_bias of 0x3fff and a 64 | |
68 | bit long, the equation (long)(1 - exp_bias) evaluates to | |
69 | 4294950914) instead of -16382). */ | |
70 | int exp_bias; | |
252b5132 RH |
71 | /* Exponent value which indicates NaN. This is the actual value stored in |
72 | the float, not adjusted by the exp_bias. This usually consists of all | |
73 | one bits. */ | |
74 | unsigned int exp_nan; | |
75 | ||
76 | unsigned int man_start; | |
77 | unsigned int man_len; | |
78 | ||
79 | /* Is the integer bit explicit or implicit? */ | |
80 | enum floatformat_intbit intbit; | |
f03aa80d AC |
81 | |
82 | /* Internal name for debugging. */ | |
83 | const char *name; | |
5324d185 AC |
84 | |
85 | /* Validator method. */ | |
3b6940c0 | 86 | int (*is_valid) (const struct floatformat *fmt, const void *from); |
252b5132 RH |
87 | }; |
88 | ||
89 | /* floatformats for IEEE single and double, big and little endian. */ | |
90 | ||
91 | extern const struct floatformat floatformat_ieee_single_big; | |
92 | extern const struct floatformat floatformat_ieee_single_little; | |
93 | extern const struct floatformat floatformat_ieee_double_big; | |
94 | extern const struct floatformat floatformat_ieee_double_little; | |
95 | ||
96 | /* floatformat for ARM IEEE double, little endian bytes and big endian words */ | |
97 | ||
98 | extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; | |
99 | ||
100 | /* floatformats for various extendeds. */ | |
101 | ||
102 | extern const struct floatformat floatformat_i387_ext; | |
103 | extern const struct floatformat floatformat_m68881_ext; | |
104 | extern const struct floatformat floatformat_i960_ext; | |
105 | extern const struct floatformat floatformat_m88110_ext; | |
eb828599 | 106 | extern const struct floatformat floatformat_m88110_harris_ext; |
eb828599 AC |
107 | extern const struct floatformat floatformat_arm_ext_big; |
108 | extern const struct floatformat floatformat_arm_ext_littlebyte_bigword; | |
109 | /* IA-64 Floating Point register spilt into memory. */ | |
110 | extern const struct floatformat floatformat_ia64_spill_big; | |
111 | extern const struct floatformat floatformat_ia64_spill_little; | |
112 | extern const struct floatformat floatformat_ia64_quad_big; | |
113 | extern const struct floatformat floatformat_ia64_quad_little; | |
252b5132 RH |
114 | |
115 | /* Convert from FMT to a double. | |
116 | FROM is the address of the extended float. | |
117 | Store the double in *TO. */ | |
118 | ||
119 | extern void | |
3b6940c0 | 120 | floatformat_to_double (const struct floatformat *, const void *, double *); |
252b5132 RH |
121 | |
122 | /* The converse: convert the double *FROM to FMT | |
123 | and store where TO points. */ | |
124 | ||
125 | extern void | |
3b6940c0 | 126 | floatformat_from_double (const struct floatformat *, const double *, void *); |
252b5132 | 127 | |
fca63fe8 DJ |
128 | /* Return non-zero iff the data at FROM is a valid number in format FMT. */ |
129 | ||
130 | extern int | |
3b6940c0 | 131 | floatformat_is_valid (const struct floatformat *fmt, const void *from); |
fca63fe8 | 132 | |
252b5132 | 133 | #endif /* defined (FLOATFORMAT_H) */ |