convert_numeric.h (5903B)
1 /* IEEE floating point support declarations, for GDB, the GNU Debugger. 2 Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005 3 Free Software Foundation, Inc. 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 19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 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 EXTRACTOR_floatformat_byteorders 35 { 36 /* Standard little endian byte order. 37 EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ 38 floatformat_little, 39 40 /* Standard big endian byte order. 41 EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ 42 floatformat_big, 43 44 /* Little endian byte order but big endian word order. 45 EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ 46 floatformat_littlebyte_bigword, 47 48 /* VAX byte order. Little endian byte order with 16-bit words. The 49 following example is an illustration of the byte order only; VAX 50 doesn't have a fully IEEE compliant floating-point format. 51 EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ 52 floatformat_vax 53 }; 54 55 enum EXTRACTOR_floatformat_intbit { floatformat_intbit_yes, 56 floatformat_intbit_no }; 57 58 struct EXTRACTOR_floatformat 59 { 60 enum EXTRACTOR_floatformat_byteorders byteorder; 61 unsigned int totalsize; /* Total size of number in bits */ 62 63 /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ 64 unsigned int sign_start; 65 66 unsigned int exp_start; 67 unsigned int exp_len; 68 /* Bias added to a "true" exponent to form the biased exponent. It 69 is intentionally signed as, otherwize, -exp_bias can turn into a 70 very large number (e.g., given the exp_bias of 0x3fff and a 64 71 bit long, the equation (long)(1 - exp_bias) evaluates to 72 4294950914) instead of -16382). */ 73 int exp_bias; 74 /* Exponent value which indicates NaN. This is the actual value stored in 75 the float, not adjusted by the exp_bias. This usually consists of all 76 one bits. */ 77 unsigned int exp_nan; 78 79 unsigned int man_start; 80 unsigned int man_len; 81 82 /* Is the integer bit explicit or implicit? */ 83 enum EXTRACTOR_floatformat_intbit intbit; 84 85 /* Internal name for debugging. */ 86 const char *name; 87 88 /* Validator method. */ 89 int (*is_valid) (const struct EXTRACTOR_floatformat *fmt, const void *from); 90 }; 91 92 /* floatformats for IEEE single and double, big and little endian. */ 93 94 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_single_big; 95 extern const struct EXTRACTOR_floatformat 96 EXTRACTOR_floatformat_ieee_single_little; 97 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ieee_double_big; 98 extern const struct EXTRACTOR_floatformat 99 EXTRACTOR_floatformat_ieee_double_little; 100 101 /* floatformat for ARM IEEE double, little endian bytes and big endian words */ 102 103 extern const struct EXTRACTOR_floatformat 104 EXTRACTOR_floatformat_ieee_double_littlebyte_bigword; 105 106 /* floatformats for VAX. */ 107 108 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_vax_f; 109 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_vax_d; 110 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_vax_g; 111 112 /* floatformats for various extendeds. */ 113 114 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_i387_ext; 115 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_m68881_ext; 116 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_i960_ext; 117 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_m88110_ext; 118 extern const struct EXTRACTOR_floatformat 119 EXTRACTOR_floatformat_m88110_harris_ext; 120 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_arm_ext_big; 121 extern const struct EXTRACTOR_floatformat 122 EXTRACTOR_floatformat_arm_ext_littlebyte_bigword; 123 /* IA-64 Floating Point register spilt into memory. */ 124 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ia64_spill_big; 125 extern const struct EXTRACTOR_floatformat 126 EXTRACTOR_floatformat_ia64_spill_little; 127 extern const struct EXTRACTOR_floatformat EXTRACTOR_floatformat_ia64_quad_big; 128 extern const struct EXTRACTOR_floatformat 129 EXTRACTOR_floatformat_ia64_quad_little; 130 131 /* Convert from FMT to a double. 132 FROM is the address of the extended float. 133 Store the double in *TO. */ 134 135 extern void 136 EXTRACTOR_common_floatformat_to_double (const struct EXTRACTOR_floatformat *, 137 const void *, double *); 138 139 /* The converse: convert the double *FROM to FMT 140 and store where TO points. */ 141 142 extern void 143 EXTRACTOR_common_floatformat_from_double (const struct EXTRACTOR_floatformat *, 144 const double *, void *); 145 146 /* Return non-zero iff the data at FROM is a valid number in format FMT. */ 147 148 extern int 149 EXTRACTOR_common_floatformat_is_valid (const struct EXTRACTOR_floatformat *fmt, 150 const void *from); 151 152 #endif /* defined (FLOATFORMAT_H) */