| /* IEEE floating point support declarations, for GDB, the GNU Debugger. |
| Copyright (C) 1991 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| |
| #if !defined (FLOATFORMAT_H) |
| #define FLOATFORMAT_H 1 |
| |
| #include "ansidecl.h" |
| |
| /* A floatformat consists of a sign bit, an exponent and a mantissa. Once the |
| bytes are concatenated according to the byteorder flag, then each of those |
| fields is contiguous. We number the bits with 0 being the most significant |
| (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field |
| contains with the *_start and *_len fields. */ |
| |
| /* What is the order of the bytes. */ |
| |
| enum floatformat_byteorders { |
| |
| /* Standard little endian byte order. |
| EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ |
| |
| floatformat_little, |
| |
| /* Standard big endian byte order. |
| EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ |
| |
| floatformat_big, |
| |
| /* Little endian byte order but big endian word order. |
| EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ |
| |
| floatformat_littlebyte_bigword |
| |
| }; |
| |
| enum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; |
| |
| struct floatformat |
| { |
| enum floatformat_byteorders byteorder; |
| unsigned int totalsize; /* Total size of number in bits */ |
| |
| /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ |
| unsigned int sign_start; |
| |
| unsigned int exp_start; |
| unsigned int exp_len; |
| /* Amount added to "true" exponent. 0x3fff for many IEEE extendeds. */ |
| unsigned int exp_bias; |
| /* Exponent value which indicates NaN. This is the actual value stored in |
| the float, not adjusted by the exp_bias. This usually consists of all |
| one bits. */ |
| unsigned int exp_nan; |
| |
| unsigned int man_start; |
| unsigned int man_len; |
| |
| /* Is the integer bit explicit or implicit? */ |
| enum floatformat_intbit intbit; |
| }; |
| |
| /* floatformats for IEEE single and double, big and little endian. */ |
| |
| extern const struct floatformat floatformat_ieee_single_big; |
| extern const struct floatformat floatformat_ieee_single_little; |
| extern const struct floatformat floatformat_ieee_double_big; |
| extern const struct floatformat floatformat_ieee_double_little; |
| |
| /* floatformat for ARM IEEE double, little endian bytes and big endian words */ |
| |
| extern const struct floatformat floatformat_ieee_double_littlebyte_bigword; |
| |
| /* floatformats for various extendeds. */ |
| |
| extern const struct floatformat floatformat_i387_ext; |
| extern const struct floatformat floatformat_m68881_ext; |
| extern const struct floatformat floatformat_i960_ext; |
| extern const struct floatformat floatformat_m88110_ext; |
| extern const struct floatformat floatformat_arm_ext; |
| |
| /* Convert from FMT to a double. |
| FROM is the address of the extended float. |
| Store the double in *TO. */ |
| |
| extern void |
| floatformat_to_double PARAMS ((const struct floatformat *, char *, double *)); |
| |
| /* The converse: convert the double *FROM to FMT |
| and store where TO points. */ |
| |
| extern void |
| floatformat_from_double PARAMS ((const struct floatformat *, |
| double *, char *)); |
| |
| #endif /* defined (FLOATFORMAT_H) */ |