1*86d7f5d3SJohn Marino /* IEEE floating point support declarations, for GDB, the GNU Debugger. 2*86d7f5d3SJohn Marino Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005, 2010 3*86d7f5d3SJohn Marino Free Software Foundation, Inc. 4*86d7f5d3SJohn Marino 5*86d7f5d3SJohn Marino This file is part of GDB. 6*86d7f5d3SJohn Marino 7*86d7f5d3SJohn Marino This program is free software; you can redistribute it and/or modify 8*86d7f5d3SJohn Marino it under the terms of the GNU General Public License as published by 9*86d7f5d3SJohn Marino the Free Software Foundation; either version 2 of the License, or 10*86d7f5d3SJohn Marino (at your option) any later version. 11*86d7f5d3SJohn Marino 12*86d7f5d3SJohn Marino This program is distributed in the hope that it will be useful, 13*86d7f5d3SJohn Marino but WITHOUT ANY WARRANTY; without even the implied warranty of 14*86d7f5d3SJohn Marino MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15*86d7f5d3SJohn Marino GNU General Public License for more details. 16*86d7f5d3SJohn Marino 17*86d7f5d3SJohn Marino You should have received a copy of the GNU General Public License 18*86d7f5d3SJohn Marino along with this program; if not, write to the Free Software 19*86d7f5d3SJohn Marino Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 20*86d7f5d3SJohn Marino 21*86d7f5d3SJohn Marino #if !defined (FLOATFORMAT_H) 22*86d7f5d3SJohn Marino #define FLOATFORMAT_H 1 23*86d7f5d3SJohn Marino 24*86d7f5d3SJohn Marino #include "ansidecl.h" 25*86d7f5d3SJohn Marino 26*86d7f5d3SJohn Marino /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the 27*86d7f5d3SJohn Marino bytes are concatenated according to the byteorder flag, then each of those 28*86d7f5d3SJohn Marino fields is contiguous. We number the bits with 0 being the most significant 29*86d7f5d3SJohn Marino (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field 30*86d7f5d3SJohn Marino contains with the *_start and *_len fields. */ 31*86d7f5d3SJohn Marino 32*86d7f5d3SJohn Marino /* What is the order of the bytes? */ 33*86d7f5d3SJohn Marino 34*86d7f5d3SJohn Marino enum floatformat_byteorders { 35*86d7f5d3SJohn Marino /* Standard little endian byte order. 36*86d7f5d3SJohn Marino EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ 37*86d7f5d3SJohn Marino floatformat_little, 38*86d7f5d3SJohn Marino 39*86d7f5d3SJohn Marino /* Standard big endian byte order. 40*86d7f5d3SJohn Marino EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ 41*86d7f5d3SJohn Marino floatformat_big, 42*86d7f5d3SJohn Marino 43*86d7f5d3SJohn Marino /* Little endian byte order but big endian word order. 44*86d7f5d3SJohn Marino EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ 45*86d7f5d3SJohn Marino floatformat_littlebyte_bigword, 46*86d7f5d3SJohn Marino 47*86d7f5d3SJohn Marino /* VAX byte order. Little endian byte order with 16-bit words. The 48*86d7f5d3SJohn Marino following example is an illustration of the byte order only; VAX 49*86d7f5d3SJohn Marino doesn't have a fully IEEE compliant floating-point format. 50*86d7f5d3SJohn Marino EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ 51*86d7f5d3SJohn Marino floatformat_vax 52*86d7f5d3SJohn Marino }; 53*86d7f5d3SJohn Marino 54*86d7f5d3SJohn Marino enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; 55*86d7f5d3SJohn Marino 56*86d7f5d3SJohn Marino struct floatformat 57*86d7f5d3SJohn Marino { 58*86d7f5d3SJohn Marino enum floatformat_byteorders byteorder; 59*86d7f5d3SJohn Marino unsigned int totalsize; /* Total size of number in bits */ 60*86d7f5d3SJohn Marino 61*86d7f5d3SJohn Marino /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ 62*86d7f5d3SJohn Marino unsigned int sign_start; 63*86d7f5d3SJohn Marino 64*86d7f5d3SJohn Marino unsigned int exp_start; 65*86d7f5d3SJohn Marino unsigned int exp_len; 66*86d7f5d3SJohn Marino /* Bias added to a "true" exponent to form the biased exponent. It 67*86d7f5d3SJohn Marino is intentionally signed as, otherwize, -exp_bias can turn into a 68*86d7f5d3SJohn Marino very large number (e.g., given the exp_bias of 0x3fff and a 64 69*86d7f5d3SJohn Marino bit long, the equation (long)(1 - exp_bias) evaluates to 70*86d7f5d3SJohn Marino 4294950914) instead of -16382). */ 71*86d7f5d3SJohn Marino int exp_bias; 72*86d7f5d3SJohn Marino /* Exponent value which indicates NaN. This is the actual value stored in 73*86d7f5d3SJohn Marino the float, not adjusted by the exp_bias. This usually consists of all 74*86d7f5d3SJohn Marino one bits. */ 75*86d7f5d3SJohn Marino unsigned int exp_nan; 76*86d7f5d3SJohn Marino 77*86d7f5d3SJohn Marino unsigned int man_start; 78*86d7f5d3SJohn Marino unsigned int man_len; 79*86d7f5d3SJohn Marino 80*86d7f5d3SJohn Marino /* Is the integer bit explicit or implicit? */ 81*86d7f5d3SJohn Marino enum floatformat_intbit intbit; 82*86d7f5d3SJohn Marino 83*86d7f5d3SJohn Marino /* Internal name for debugging. */ 84*86d7f5d3SJohn Marino const char *name; 85*86d7f5d3SJohn Marino 86*86d7f5d3SJohn Marino /* Validator method. */ 87*86d7f5d3SJohn Marino int (*is_valid) (const struct floatformat *fmt, const void *from); 88*86d7f5d3SJohn Marino 89*86d7f5d3SJohn Marino /* Is the format actually the sum of two smaller floating point 90*86d7f5d3SJohn Marino formats (IBM long double, as described in 91*86d7f5d3SJohn Marino gcc/config/rs6000/darwin-ldouble-format)? If so, this is the 92*86d7f5d3SJohn Marino smaller format in question, and the fields sign_start through 93*86d7f5d3SJohn Marino intbit describe the first half. If not, this is NULL. */ 94*86d7f5d3SJohn Marino const struct floatformat *split_half; 95*86d7f5d3SJohn Marino }; 96*86d7f5d3SJohn Marino 97*86d7f5d3SJohn Marino /* floatformats for IEEE single and double, big and little endian. */ 98*86d7f5d3SJohn Marino 99*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_half_big; 100*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_half_little; 101*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_single_big; 102*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_single_little; 103*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_double_big; 104*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_double_little; 105*86d7f5d3SJohn Marino 106*86d7f5d3SJohn Marino /* floatformat for ARM IEEE double, little endian bytes and big endian words */ 107*86d7f5d3SJohn Marino 108*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; 109*86d7f5d3SJohn Marino 110*86d7f5d3SJohn Marino /* floatformats for VAX. */ 111*86d7f5d3SJohn Marino 112*86d7f5d3SJohn Marino extern const struct floatformat floatformat_vax_f; 113*86d7f5d3SJohn Marino extern const struct floatformat floatformat_vax_d; 114*86d7f5d3SJohn Marino extern const struct floatformat floatformat_vax_g; 115*86d7f5d3SJohn Marino 116*86d7f5d3SJohn Marino /* floatformats for various extendeds. */ 117*86d7f5d3SJohn Marino 118*86d7f5d3SJohn Marino extern const struct floatformat floatformat_i387_ext; 119*86d7f5d3SJohn Marino extern const struct floatformat floatformat_m68881_ext; 120*86d7f5d3SJohn Marino extern const struct floatformat floatformat_i960_ext; 121*86d7f5d3SJohn Marino extern const struct floatformat floatformat_m88110_ext; 122*86d7f5d3SJohn Marino extern const struct floatformat floatformat_m88110_harris_ext; 123*86d7f5d3SJohn Marino extern const struct floatformat floatformat_arm_ext_big; 124*86d7f5d3SJohn Marino extern const struct floatformat floatformat_arm_ext_littlebyte_bigword; 125*86d7f5d3SJohn Marino /* IA-64 Floating Point register spilt into memory. */ 126*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ia64_spill_big; 127*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ia64_spill_little; 128*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ia64_quad_big; 129*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ia64_quad_little; 130*86d7f5d3SJohn Marino /* IBM long double (double+double). */ 131*86d7f5d3SJohn Marino extern const struct floatformat floatformat_ibm_long_double; 132*86d7f5d3SJohn Marino 133*86d7f5d3SJohn Marino /* Convert from FMT to a double. 134*86d7f5d3SJohn Marino FROM is the address of the extended float. 135*86d7f5d3SJohn Marino Store the double in *TO. */ 136*86d7f5d3SJohn Marino 137*86d7f5d3SJohn Marino extern void 138*86d7f5d3SJohn Marino floatformat_to_double (const struct floatformat *, const void *, double *); 139*86d7f5d3SJohn Marino 140*86d7f5d3SJohn Marino /* The converse: convert the double *FROM to FMT 141*86d7f5d3SJohn Marino and store where TO points. */ 142*86d7f5d3SJohn Marino 143*86d7f5d3SJohn Marino extern void 144*86d7f5d3SJohn Marino floatformat_from_double (const struct floatformat *, const double *, void *); 145*86d7f5d3SJohn Marino 146*86d7f5d3SJohn Marino /* Return non-zero iff the data at FROM is a valid number in format FMT. */ 147*86d7f5d3SJohn Marino 148*86d7f5d3SJohn Marino extern int 149*86d7f5d3SJohn Marino floatformat_is_valid (const struct floatformat *fmt, const void *from); 150*86d7f5d3SJohn Marino 151*86d7f5d3SJohn Marino #endif /* defined (FLOATFORMAT_H) */ 152