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1 /* IEEE floating point support declarations, for GDB, the GNU Debugger.
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2 Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005
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3 Free Software Foundation, Inc.
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4
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5 This file is part of GDB.
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6
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7 This program is free software; you can redistribute it and/or modify
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8 it under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 2 of the License, or
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10 (at your option) any later version.
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11
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12 This program is distributed in the hope that it will be useful,
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13 but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with this program; if not, write to the Free Software
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19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
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20
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21 #if !defined (FLOATFORMAT_H)
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22 #define FLOATFORMAT_H 1
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23
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24 #include "ansidecl.h"
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25
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26 /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the
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27 bytes are concatenated according to the byteorder flag, then each of those
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28 fields is contiguous. We number the bits with 0 being the most significant
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29 (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field
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30 contains with the *_start and *_len fields. */
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31
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32 /* What is the order of the bytes? */
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33
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34 enum floatformat_byteorders {
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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 floatformat_little,
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38
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39 /* Standard big endian byte order.
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40 EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */
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41 floatformat_big,
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42
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43 /* Little endian byte order but big endian word order.
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44 EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */
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45 floatformat_littlebyte_bigword,
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46
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47 /* VAX byte order. Little endian byte order with 16-bit words. The
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48 following example is an illustration of the byte order only; VAX
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49 doesn't have a fully IEEE compliant floating-point format.
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50 EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */
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51 floatformat_vax
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52 };
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53
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54 enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no };
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55
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56 struct floatformat
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57 {
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58 enum floatformat_byteorders byteorder;
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59 unsigned int totalsize; /* Total size of number in bits */
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60
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61 /* Sign bit is always one bit long. 1 means negative, 0 means positive. */
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62 unsigned int sign_start;
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63
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64 unsigned int exp_start;
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65 unsigned int exp_len;
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66 /* Bias added to a "true" exponent to form the biased exponent. It
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67 is intentionally signed as, otherwize, -exp_bias can turn into a
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68 very large number (e.g., given the exp_bias of 0x3fff and a 64
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69 bit long, the equation (long)(1 - exp_bias) evaluates to
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70 4294950914) instead of -16382). */
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71 int exp_bias;
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72 /* Exponent value which indicates NaN. This is the actual value stored in
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73 the float, not adjusted by the exp_bias. This usually consists of all
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74 one bits. */
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75 unsigned int exp_nan;
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76
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77 unsigned int man_start;
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78 unsigned int man_len;
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79
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80 /* Is the integer bit explicit or implicit? */
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81 enum floatformat_intbit intbit;
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82
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83 /* Internal name for debugging. */
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84 const char *name;
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85
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86 /* Validator method. */
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87 int (*is_valid) (const struct floatformat *fmt, const void *from);
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88
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89 /* Is the format actually the sum of two smaller floating point
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90 formats (IBM long double, as described in
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91 gcc/config/rs6000/darwin-ldouble-format)? If so, this is the
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92 smaller format in question, and the fields sign_start through
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93 intbit describe the first half. If not, this is NULL. */
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94 const struct floatformat *split_half;
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95 };
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96
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97 /* floatformats for IEEE single and double, big and little endian. */
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98
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99 extern const struct floatformat floatformat_ieee_single_big;
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100 extern const struct floatformat floatformat_ieee_single_little;
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101 extern const struct floatformat floatformat_ieee_double_big;
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102 extern const struct floatformat floatformat_ieee_double_little;
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103
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104 /* floatformat for ARM IEEE double, little endian bytes and big endian words */
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105
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106 extern const struct floatformat floatformat_ieee_double_littlebyte_bigword;
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107
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108 /* floatformats for VAX. */
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109
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110 extern const struct floatformat floatformat_vax_f;
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111 extern const struct floatformat floatformat_vax_d;
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112 extern const struct floatformat floatformat_vax_g;
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113
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114 /* floatformats for various extendeds. */
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115
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116 extern const struct floatformat floatformat_i387_ext;
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117 extern const struct floatformat floatformat_m68881_ext;
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118 extern const struct floatformat floatformat_i960_ext;
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119 extern const struct floatformat floatformat_m88110_ext;
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120 extern const struct floatformat floatformat_m88110_harris_ext;
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121 extern const struct floatformat floatformat_arm_ext_big;
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122 extern const struct floatformat floatformat_arm_ext_littlebyte_bigword;
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123 /* IA-64 Floating Point register spilt into memory. */
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124 extern const struct floatformat floatformat_ia64_spill_big;
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125 extern const struct floatformat floatformat_ia64_spill_little;
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126 extern const struct floatformat floatformat_ia64_quad_big;
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127 extern const struct floatformat floatformat_ia64_quad_little;
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128 /* IBM long double (double+double). */
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129 extern const struct floatformat floatformat_ibm_long_double;
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130
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131 /* Convert from FMT to a double.
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132 FROM is the address of the extended float.
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133 Store the double in *TO. */
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134
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135 extern void
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136 floatformat_to_double (const struct floatformat *, const void *, double *);
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137
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138 /* The converse: convert the double *FROM to FMT
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139 and store where TO points. */
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140
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141 extern void
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142 floatformat_from_double (const struct floatformat *, const double *, void *);
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143
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144 /* Return non-zero iff the data at FROM is a valid number in format FMT. */
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145
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146 extern int
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147 floatformat_is_valid (const struct floatformat *fmt, const void *from);
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148
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149 #endif /* defined (FLOATFORMAT_H) */
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