| 1 | /* IEEE floating point support declarations, for GDB, the GNU Debugger.
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| 2 | Copyright 1991, 1994, 1995, 1997, 2000 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is part of GDB.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 19 |
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| 20 | #if !defined (FLOATFORMAT_H)
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| 21 | #define FLOATFORMAT_H 1
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| 22 |
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| 23 | #include "ansidecl.h"
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| 24 |
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| 25 | /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
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| 26 | bytes are concatenated according to the byteorder flag, then each of those
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| 27 | fields is contiguous. We number the bits with 0 being the most significant
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| 28 | (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
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| 29 | contains with the *_start and *_len fields. */
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| 30 |
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| 31 | /* What is the order of the bytes. */
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| 32 |
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| 33 | enum floatformat_byteorders {
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| 34 |
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| 35 | /* Standard little endian byte order.
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| 36 | EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */
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| 37 |
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| 38 | floatformat_little,
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| 39 |
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| 40 | /* Standard big endian byte order.
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| 41 | EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
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| 42 |
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| 43 | floatformat_big,
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| 44 |
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| 45 | /* Little endian byte order but big endian word order.
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| 46 | EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
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| 47 |
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| 48 | floatformat_littlebyte_bigword
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| 49 |
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| 50 | };
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| 51 |
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| 52 | enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
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| 53 |
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| 54 | struct floatformat
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| 55 | {
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| 56 | enum floatformat_byteorders byteorder;
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| 57 | unsigned int totalsize; /* Total size of number in bits */
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| 58 |
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| 59 | /* Sign bit is always one bit long. 1 means negative, 0 means positive. */
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| 60 | unsigned int sign_start;
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| 61 |
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| 62 | unsigned int exp_start;
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| 63 | unsigned int exp_len;
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| 64 | /* Amount added to "true" exponent. 0x3fff for many IEEE extendeds. */
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| 65 | unsigned int exp_bias;
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| 66 | /* Exponent value which indicates NaN. This is the actual value stored in
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| 67 | the float, not adjusted by the exp_bias. This usually consists of all
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| 68 | one bits. */
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| 69 | unsigned int exp_nan;
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| 70 |
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| 71 | unsigned int man_start;
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| 72 | unsigned int man_len;
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| 73 |
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| 74 | /* Is the integer bit explicit or implicit? */
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| 75 | enum floatformat_intbit intbit;
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| 76 |
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| 77 | /* Internal name for debugging. */
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| 78 | const char *name;
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| 79 | };
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| 80 |
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| 81 | /* floatformats for IEEE single and double, big and little endian. */
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| 82 |
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| 83 | extern const struct floatformat floatformat_ieee_single_big;
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| 84 | extern const struct floatformat floatformat_ieee_single_little;
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| 85 | extern const struct floatformat floatformat_ieee_double_big;
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| 86 | extern const struct floatformat floatformat_ieee_double_little;
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| 87 |
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| 88 | /* floatformat for ARM IEEE double, little endian bytes and big endian words */
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| 89 |
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| 90 | extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
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| 91 |
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| 92 | /* floatformats for various extendeds. */
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| 93 |
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| 94 | extern const struct floatformat floatformat_i387_ext;
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| 95 | extern const struct floatformat floatformat_m68881_ext;
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| 96 | extern const struct floatformat floatformat_i960_ext;
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| 97 | extern const struct floatformat floatformat_m88110_ext;
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| 98 | extern const struct floatformat floatformat_m88110_harris_ext;
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| 99 | extern const struct floatformat floatformat_arm_ext_big;
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| 100 | extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
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| 101 | /* IA-64 Floating Point register spilt into memory. */
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| 102 | extern const struct floatformat floatformat_ia64_spill_big;
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| 103 | extern const struct floatformat floatformat_ia64_spill_little;
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| 104 | extern const struct floatformat floatformat_ia64_quad_big;
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| 105 | extern const struct floatformat floatformat_ia64_quad_little;
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| 106 |
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| 107 | /* Convert from FMT to a double.
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| 108 | FROM is the address of the extended float.
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| 109 | Store the double in *TO. */
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| 110 |
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| 111 | extern void
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| 112 | floatformat_to_double PARAMS ((const struct floatformat *, char *, double *));
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| 113 |
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| 114 | /* The converse: convert the double *FROM to FMT
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| 115 | and store where TO points. */
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| 116 |
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| 117 | extern void
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| 118 | floatformat_from_double PARAMS ((const struct floatformat *,
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| 119 | double *, char *));
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| 120 |
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| 121 | #endif /* defined (FLOATFORMAT_H) */
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