| /* IEEE floating point support declarations, for GDB, the GNU Debugger. |
| Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005, 2010 |
| 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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, |
| |
| /* VAX byte order. Little endian byte order with 16-bit words. The |
| following example is an illustration of the byte order only; VAX |
| doesn't have a fully IEEE compliant floating-point format. |
| EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ |
| floatformat_vax |
| }; |
| |
| 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; |
| /* Bias added to a "true" exponent to form the biased exponent. It |
| is intentionally signed as, otherwize, -exp_bias can turn into a |
| very large number (e.g., given the exp_bias of 0x3fff and a 64 |
| bit long, the equation (long)(1 - exp_bias) evaluates to |
| 4294950914) instead of -16382). */ |
| 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; |
| |
| /* Internal name for debugging. */ |
| const char *name; |
| |
| /* Validator method. */ |
| int (*is_valid) (const struct floatformat *fmt, const void *from); |
| |
| /* Is the format actually the sum of two smaller floating point |
| formats (IBM long double, as described in |
| gcc/config/rs6000/darwin-ldouble-format)? If so, this is the |
| smaller format in question, and the fields sign_start through |
| intbit describe the first half. If not, this is NULL. */ |
| const struct floatformat *split_half; |
| }; |
| |
| /* floatformats for IEEE single and double, big and little endian. */ |
| |
| extern const struct floatformat floatformat_ieee_half_big; |
| extern const struct floatformat floatformat_ieee_half_little; |
| 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 VAX. */ |
| |
| extern const struct floatformat floatformat_vax_f; |
| extern const struct floatformat floatformat_vax_d; |
| extern const struct floatformat floatformat_vax_g; |
| |
| /* 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_m88110_harris_ext; |
| extern const struct floatformat floatformat_arm_ext_big; |
| extern const struct floatformat floatformat_arm_ext_littlebyte_bigword; |
| /* IA-64 Floating Point register spilt into memory. */ |
| extern const struct floatformat floatformat_ia64_spill_big; |
| extern const struct floatformat floatformat_ia64_spill_little; |
| extern const struct floatformat floatformat_ia64_quad_big; |
| extern const struct floatformat floatformat_ia64_quad_little; |
| /* IBM long double (double+double). */ |
| extern const struct floatformat floatformat_ibm_long_double_big; |
| extern const struct floatformat floatformat_ibm_long_double_little; |
| |
| /* Convert from FMT to a double. |
| FROM is the address of the extended float. |
| Store the double in *TO. */ |
| |
| extern void |
| floatformat_to_double (const struct floatformat *, const void *, double *); |
| |
| /* The converse: convert the double *FROM to FMT |
| and store where TO points. */ |
| |
| extern void |
| floatformat_from_double (const struct floatformat *, const double *, void *); |
| |
| /* Return non-zero iff the data at FROM is a valid number in format FMT. */ |
| |
| extern int |
| floatformat_is_valid (const struct floatformat *fmt, const void *from); |
| |
| #endif /* defined (FLOATFORMAT_H) */ |