133965Sjdp/* IEEE floating point support declarations, for GDB, the GNU Debugger. 2218822Sdim Copyright 1991, 1994, 1995, 1997, 2000, 2003, 2005 3218822Sdim Free Software Foundation, Inc. 433965Sjdp 533965SjdpThis file is part of GDB. 633965Sjdp 733965SjdpThis program is free software; you can redistribute it and/or modify 833965Sjdpit under the terms of the GNU General Public License as published by 933965Sjdpthe Free Software Foundation; either version 2 of the License, or 1033965Sjdp(at your option) any later version. 1133965Sjdp 1233965SjdpThis program is distributed in the hope that it will be useful, 1333965Sjdpbut WITHOUT ANY WARRANTY; without even the implied warranty of 1433965SjdpMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1533965SjdpGNU General Public License for more details. 1633965Sjdp 1733965SjdpYou should have received a copy of the GNU General Public License 1833965Sjdpalong with this program; if not, write to the Free Software 19218822SdimFoundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ 2033965Sjdp 2133965Sjdp#if !defined (FLOATFORMAT_H) 2233965Sjdp#define FLOATFORMAT_H 1 2333965Sjdp 2433965Sjdp#include "ansidecl.h" 2533965Sjdp 2633965Sjdp/* A floatformat consists of a sign bit, an exponent and a mantissa. Once the 2733965Sjdp bytes are concatenated according to the byteorder flag, then each of those 2833965Sjdp fields is contiguous. We number the bits with 0 being the most significant 2933965Sjdp (i.e. BITS_BIG_ENDIAN type numbering), and specify which bits each field 3033965Sjdp contains with the *_start and *_len fields. */ 3133965Sjdp 32218822Sdim/* What is the order of the bytes? */ 3333965Sjdp 3438889Sjdpenum floatformat_byteorders { 3538889Sjdp /* Standard little endian byte order. 3638889Sjdp EX: 1.2345678e10 => 00 00 80 c5 e0 fe 06 42 */ 3738889Sjdp floatformat_little, 3838889Sjdp 3938889Sjdp /* Standard big endian byte order. 4038889Sjdp EX: 1.2345678e10 => 42 06 fe e0 c5 80 00 00 */ 4138889Sjdp floatformat_big, 4238889Sjdp 4338889Sjdp /* Little endian byte order but big endian word order. 4438889Sjdp EX: 1.2345678e10 => e0 fe 06 42 00 00 80 c5 */ 45218822Sdim floatformat_littlebyte_bigword, 4638889Sjdp 47218822Sdim /* VAX byte order. Little endian byte order with 16-bit words. The 48218822Sdim following example is an illustration of the byte order only; VAX 49218822Sdim doesn't have a fully IEEE compliant floating-point format. 50218822Sdim EX: 1.2345678e10 => 80 c5 00 00 06 42 e0 fe */ 51218822Sdim floatformat_vax 5238889Sjdp}; 5338889Sjdp 5433965Sjdpenum floatformat_intbit { floatformat_intbit_yes, floatformat_intbit_no }; 5533965Sjdp 5633965Sjdpstruct floatformat 5733965Sjdp{ 5833965Sjdp enum floatformat_byteorders byteorder; 5933965Sjdp unsigned int totalsize; /* Total size of number in bits */ 6033965Sjdp 6133965Sjdp /* Sign bit is always one bit long. 1 means negative, 0 means positive. */ 6233965Sjdp unsigned int sign_start; 6333965Sjdp 6433965Sjdp unsigned int exp_start; 6533965Sjdp unsigned int exp_len; 66130561Sobrien /* Bias added to a "true" exponent to form the biased exponent. It 67130561Sobrien is intentionally signed as, otherwize, -exp_bias can turn into a 68130561Sobrien very large number (e.g., given the exp_bias of 0x3fff and a 64 69130561Sobrien bit long, the equation (long)(1 - exp_bias) evaluates to 70130561Sobrien 4294950914) instead of -16382). */ 71130561Sobrien int exp_bias; 7233965Sjdp /* Exponent value which indicates NaN. This is the actual value stored in 7333965Sjdp the float, not adjusted by the exp_bias. This usually consists of all 7433965Sjdp one bits. */ 7533965Sjdp unsigned int exp_nan; 7633965Sjdp 7733965Sjdp unsigned int man_start; 7833965Sjdp unsigned int man_len; 7933965Sjdp 8033965Sjdp /* Is the integer bit explicit or implicit? */ 8133965Sjdp enum floatformat_intbit intbit; 8277298Sobrien 8377298Sobrien /* Internal name for debugging. */ 8477298Sobrien const char *name; 85130561Sobrien 86130561Sobrien /* Validator method. */ 87218822Sdim int (*is_valid) (const struct floatformat *fmt, const void *from); 8833965Sjdp}; 8933965Sjdp 9033965Sjdp/* floatformats for IEEE single and double, big and little endian. */ 9133965Sjdp 9233965Sjdpextern const struct floatformat floatformat_ieee_single_big; 9333965Sjdpextern const struct floatformat floatformat_ieee_single_little; 9433965Sjdpextern const struct floatformat floatformat_ieee_double_big; 9533965Sjdpextern const struct floatformat floatformat_ieee_double_little; 9633965Sjdp 9738889Sjdp/* floatformat for ARM IEEE double, little endian bytes and big endian words */ 9838889Sjdp 9938889Sjdpextern const struct floatformat floatformat_ieee_double_littlebyte_bigword; 10038889Sjdp 101218822Sdim/* floatformats for VAX. */ 102218822Sdim 103218822Sdimextern const struct floatformat floatformat_vax_f; 104218822Sdimextern const struct floatformat floatformat_vax_d; 105218822Sdimextern const struct floatformat floatformat_vax_g; 106218822Sdim 10733965Sjdp/* floatformats for various extendeds. */ 10833965Sjdp 10933965Sjdpextern const struct floatformat floatformat_i387_ext; 11033965Sjdpextern const struct floatformat floatformat_m68881_ext; 11133965Sjdpextern const struct floatformat floatformat_i960_ext; 11233965Sjdpextern const struct floatformat floatformat_m88110_ext; 11389857Sobrienextern const struct floatformat floatformat_m88110_harris_ext; 11489857Sobrienextern const struct floatformat floatformat_arm_ext_big; 11589857Sobrienextern const struct floatformat floatformat_arm_ext_littlebyte_bigword; 11689857Sobrien/* IA-64 Floating Point register spilt into memory. */ 11789857Sobrienextern const struct floatformat floatformat_ia64_spill_big; 11889857Sobrienextern const struct floatformat floatformat_ia64_spill_little; 11989857Sobrienextern const struct floatformat floatformat_ia64_quad_big; 12089857Sobrienextern const struct floatformat floatformat_ia64_quad_little; 12133965Sjdp 12233965Sjdp/* Convert from FMT to a double. 12333965Sjdp FROM is the address of the extended float. 12433965Sjdp Store the double in *TO. */ 12533965Sjdp 12633965Sjdpextern void 127218822Sdimfloatformat_to_double (const struct floatformat *, const void *, double *); 12833965Sjdp 12933965Sjdp/* The converse: convert the double *FROM to FMT 13033965Sjdp and store where TO points. */ 13133965Sjdp 13233965Sjdpextern void 133218822Sdimfloatformat_from_double (const struct floatformat *, const double *, void *); 13433965Sjdp 135130561Sobrien/* Return non-zero iff the data at FROM is a valid number in format FMT. */ 136130561Sobrien 137130561Sobrienextern int 138218822Sdimfloatformat_is_valid (const struct floatformat *fmt, const void *from); 139130561Sobrien 14033965Sjdp#endif /* defined (FLOATFORMAT_H) */ 141