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1 | /* IEEE floating point support declarations, for GDB, the GNU Debugger. | |
2 | Copyright (C) 1991, 2000 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. */ | |
19 | ||
20 | #if !defined (FLOATFORMAT_H) | |
21 | #define FLOATFORMAT_H 1 | |
22 | ||
23 | #include "ansidecl.h" | |
24 | ||
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. */ | |
30 | ||
31 | /* What is the order of the bytes. */ | |
32 | ||
33 | enum floatformat_byteorders { | |
34 | ||
35 | /* Standard little endian byte order. | |
36 | EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ | |
37 | ||
38 | floatformat_little, | |
39 | ||
40 | /* Standard big endian byte order. | |
41 | EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ | |
42 | ||
43 | floatformat_big, | |
44 | ||
45 | /* Little endian byte order but big endian word order. | |
46 | EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ | |
47 | ||
48 | floatformat_littlebyte_bigword | |
49 | ||
50 | }; | |
51 | ||
52 | enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; | |
53 | ||
54 | struct floatformat | |
55 | { | |
56 | enum floatformat_byteorders byteorder; | |
57 | unsigned int totalsize; /* Total size of number in bits */ | |
58 | ||
59 | /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ | |
60 | unsigned int sign_start; | |
61 | ||
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; | |
70 | ||
71 | unsigned int man_start; | |
72 | unsigned int man_len; | |
73 | ||
74 | /* Is the integer bit explicit or implicit? */ | |
75 | enum floatformat_intbit intbit; | |
76 | ||
77 | /* Internal name for debugging. */ | |
78 | const char *name; | |
79 | }; | |
80 | ||
81 | /* floatformats for IEEE single and double, big and little endian. */ | |
82 | ||
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; | |
87 | ||
88 | /* floatformat for ARM IEEE double, little endian bytes and big endian words */ | |
89 | ||
90 | extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; | |
91 | ||
92 | /* floatformats for various extendeds. */ | |
93 | ||
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_arm_ext; | |
99 | ||
100 | /* Convert from FMT to a double. | |
101 | FROM is the address of the extended float. | |
102 | Store the double in *TO. */ | |
103 | ||
104 | extern void | |
105 | floatformat_to_double PARAMS ((const struct floatformat *, char *, double *)); | |
106 | ||
107 | /* The converse: convert the double *FROM to FMT | |
108 | and store where TO points. */ | |
109 | ||
110 | extern void | |
111 | floatformat_from_double PARAMS ((const struct floatformat *, | |
112 | double *, char *)); | |
113 | ||
114 | #endif /* defined (FLOATFORMAT_H) */ |