1 /* IEEE floating point support declarations, for GDB, the GNU Debugger. 2 Copyright (C) 1991 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 78 /* floatformats for IEEE single and double, big and little endian. */ 79 80 extern const struct floatformat floatformat_ieee_single_big; 81 extern const struct floatformat floatformat_ieee_single_little; 82 extern const struct floatformat floatformat_ieee_double_big; 83 extern const struct floatformat floatformat_ieee_double_little; 84 85 /* floatformat for ARM IEEE double, little endian bytes and big endian words */ 86 87 extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; 88 89 /* floatformats for various extendeds. */ 90 91 extern const struct floatformat floatformat_i387_ext; 92 extern const struct floatformat floatformat_m68881_ext; 93 extern const struct floatformat floatformat_i960_ext; 94 extern const struct floatformat floatformat_m88110_ext; 95 extern const struct floatformat floatformat_arm_ext; 96 97 /* Convert from FMT to a double. 98 FROM is the address of the extended float. 99 Store the double in *TO. */ 100 101 extern void 102 floatformat_to_double PARAMS ((const struct floatformat *, char *, double *)); 103 104 /* The converse: convert the double *FROM to FMT 105 and store where TO points. */ 106 107 extern void 108 floatformat_from_double PARAMS ((const struct floatformat *, 109 double *, char *)); 110 111 #endif /* defined (FLOATFORMAT_H) */ 112