/* 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) */