0,0 → 1,152 |
/* 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) */ |