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252b5132 | 1 | /* IEEE floating point support declarations, for GDB, the GNU Debugger. |
b90efa5b | 2 | Copyright (C) 1991-2015 Free Software Foundation, Inc. |
252b5132 RH |
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 | |
e172dbf8 | 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
252b5132 RH |
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 | ||
fb10537e | 31 | /* What is the order of the bytes? */ |
252b5132 RH |
32 | |
33 | enum floatformat_byteorders { | |
252b5132 RH |
34 | /* Standard little endian byte order. |
35 | EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ | |
252b5132 RH |
36 | floatformat_little, |
37 | ||
38 | /* Standard big endian byte order. | |
39 | EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ | |
252b5132 RH |
40 | floatformat_big, |
41 | ||
42 | /* Little endian byte order but big endian word order. | |
43 | EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ | |
fb10537e | 44 | floatformat_littlebyte_bigword, |
252b5132 | 45 | |
fb10537e DD |
46 | /* VAX byte order. Little endian byte order with 16-bit words. The |
47 | following example is an illustration of the byte order only; VAX | |
48 | doesn't have a fully IEEE compliant floating-point format. | |
49 | EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ | |
50 | floatformat_vax | |
252b5132 RH |
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); |
b14d30e1 JM |
87 | |
88 | /* Is the format actually the sum of two smaller floating point | |
89 | formats (IBM long double, as described in | |
90 | gcc/config/rs6000/darwin-ldouble-format)? If so, this is the | |
91 | smaller format in question, and the fields sign_start through | |
92 | intbit describe the first half. If not, this is NULL. */ | |
93 | const struct floatformat *split_half; | |
252b5132 RH |
94 | }; |
95 | ||
96 | /* floatformats for IEEE single and double, big and little endian. */ | |
97 | ||
f9e9243a UW |
98 | extern const struct floatformat floatformat_ieee_half_big; |
99 | extern const struct floatformat floatformat_ieee_half_little; | |
252b5132 RH |
100 | extern const struct floatformat floatformat_ieee_single_big; |
101 | extern const struct floatformat floatformat_ieee_single_little; | |
102 | extern const struct floatformat floatformat_ieee_double_big; | |
103 | extern const struct floatformat floatformat_ieee_double_little; | |
104 | ||
105 | /* floatformat for ARM IEEE double, little endian bytes and big endian words */ | |
106 | ||
107 | extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; | |
108 | ||
fb10537e DD |
109 | /* floatformats for VAX. */ |
110 | ||
111 | extern const struct floatformat floatformat_vax_f; | |
112 | extern const struct floatformat floatformat_vax_d; | |
113 | extern const struct floatformat floatformat_vax_g; | |
114 | ||
252b5132 RH |
115 | /* floatformats for various extendeds. */ |
116 | ||
117 | extern const struct floatformat floatformat_i387_ext; | |
118 | extern const struct floatformat floatformat_m68881_ext; | |
119 | extern const struct floatformat floatformat_i960_ext; | |
120 | extern const struct floatformat floatformat_m88110_ext; | |
eb828599 | 121 | extern const struct floatformat floatformat_m88110_harris_ext; |
eb828599 AC |
122 | extern const struct floatformat floatformat_arm_ext_big; |
123 | extern const struct floatformat floatformat_arm_ext_littlebyte_bigword; | |
124 | /* IA-64 Floating Point register spilt into memory. */ | |
125 | extern const struct floatformat floatformat_ia64_spill_big; | |
126 | extern const struct floatformat floatformat_ia64_spill_little; | |
127 | extern const struct floatformat floatformat_ia64_quad_big; | |
128 | extern const struct floatformat floatformat_ia64_quad_little; | |
b14d30e1 | 129 | /* IBM long double (double+double). */ |
21290977 DD |
130 | extern const struct floatformat floatformat_ibm_long_double_big; |
131 | extern const struct floatformat floatformat_ibm_long_double_little; | |
252b5132 RH |
132 | |
133 | /* Convert from FMT to a double. | |
134 | FROM is the address of the extended float. | |
135 | Store the double in *TO. */ | |
136 | ||
137 | extern void | |
3b6940c0 | 138 | floatformat_to_double (const struct floatformat *, const void *, double *); |
252b5132 RH |
139 | |
140 | /* The converse: convert the double *FROM to FMT | |
141 | and store where TO points. */ | |
142 | ||
143 | extern void | |
3b6940c0 | 144 | floatformat_from_double (const struct floatformat *, const double *, void *); |
252b5132 | 145 | |
fca63fe8 DJ |
146 | /* Return non-zero iff the data at FROM is a valid number in format FMT. */ |
147 | ||
148 | extern int | |
3b6940c0 | 149 | floatformat_is_valid (const struct floatformat *fmt, const void *from); |
fca63fe8 | 150 | |
252b5132 | 151 | #endif /* defined (FLOATFORMAT_H) */ |