Commit | Line | Data |
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c906108c | 1 | /* Intel 387 floating point stuff. |
de57eccd | 2 | Copyright (C) 1988, 1989, 1991, 1998, 1999 Free Software Foundation, Inc. |
c906108c | 3 | |
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "language.h" | |
d4f3574e | 25 | #include "value.h" |
c906108c SS |
26 | #include "gdbcore.h" |
27 | #include "floatformat.h" | |
28 | ||
c906108c | 29 | |
de57eccd JM |
30 | /* FIXME: Eliminate the next two functions when we have the time to |
31 | change all the callers. */ | |
d4f3574e | 32 | |
de57eccd JM |
33 | void i387_to_double PARAMS ((char *from, char *to)); |
34 | void double_to_i387 PARAMS ((char *from, char *to)); | |
c906108c SS |
35 | |
36 | void | |
37 | i387_to_double (from, to) | |
38 | char *from; | |
39 | char *to; | |
40 | { | |
c5aa993b | 41 | floatformat_to_double (&floatformat_i387_ext, from, (double *) to); |
c906108c SS |
42 | } |
43 | ||
44 | void | |
45 | double_to_i387 (from, to) | |
46 | char *from; | |
47 | char *to; | |
48 | { | |
c5aa993b | 49 | floatformat_from_double (&floatformat_i387_ext, (double *) from, to); |
c906108c SS |
50 | } |
51 | ||
de57eccd JM |
52 | \f |
53 | /* FIXME: The functions on this page are used by the old `info float' | |
54 | implementations that a few of the i386 targets provide. These | |
55 | functions should be removed if all of these have been converted to | |
56 | use the generic implementation based on the new register file | |
57 | layout. */ | |
58 | ||
59 | static void print_387_control_bits PARAMS ((unsigned int control)); | |
60 | static void print_387_status_bits PARAMS ((unsigned int status)); | |
61 | ||
d4f3574e SS |
62 | static void |
63 | print_387_control_bits (control) | |
c906108c SS |
64 | unsigned int control; |
65 | { | |
c5aa993b | 66 | switch ((control >> 8) & 3) |
c906108c | 67 | { |
c5aa993b | 68 | case 0: |
d4f3574e | 69 | puts_unfiltered (" 24 bit; "); |
c5aa993b JM |
70 | break; |
71 | case 1: | |
d4f3574e | 72 | puts_unfiltered (" (bad); "); |
c5aa993b JM |
73 | break; |
74 | case 2: | |
d4f3574e | 75 | puts_unfiltered (" 53 bit; "); |
c5aa993b JM |
76 | break; |
77 | case 3: | |
d4f3574e | 78 | puts_unfiltered (" 64 bit; "); |
c5aa993b | 79 | break; |
c906108c | 80 | } |
c5aa993b | 81 | switch ((control >> 10) & 3) |
c906108c | 82 | { |
c5aa993b | 83 | case 0: |
d4f3574e | 84 | puts_unfiltered ("NEAR; "); |
c5aa993b JM |
85 | break; |
86 | case 1: | |
d4f3574e | 87 | puts_unfiltered ("DOWN; "); |
c5aa993b JM |
88 | break; |
89 | case 2: | |
d4f3574e | 90 | puts_unfiltered ("UP; "); |
c5aa993b JM |
91 | break; |
92 | case 3: | |
d4f3574e | 93 | puts_unfiltered ("CHOP; "); |
c5aa993b | 94 | break; |
c906108c | 95 | } |
c5aa993b | 96 | if (control & 0x3f) |
c906108c | 97 | { |
d4f3574e | 98 | puts_unfiltered ("mask"); |
c5aa993b | 99 | if (control & 0x0001) |
d4f3574e | 100 | puts_unfiltered (" INVAL"); |
c5aa993b | 101 | if (control & 0x0002) |
d4f3574e | 102 | puts_unfiltered (" DENOR"); |
c5aa993b | 103 | if (control & 0x0004) |
d4f3574e | 104 | puts_unfiltered (" DIVZ"); |
c5aa993b | 105 | if (control & 0x0008) |
d4f3574e | 106 | puts_unfiltered (" OVERF"); |
c5aa993b | 107 | if (control & 0x0010) |
d4f3574e | 108 | puts_unfiltered (" UNDER"); |
c5aa993b | 109 | if (control & 0x0020) |
d4f3574e SS |
110 | puts_unfiltered (" LOS"); |
111 | puts_unfiltered (";"); | |
c906108c | 112 | } |
cff3e48b | 113 | |
c5aa993b | 114 | if (control & 0xe080) |
d4f3574e | 115 | warning ("\nreserved bits on: %s", |
c5aa993b | 116 | local_hex_string (control & 0xe080)); |
c906108c SS |
117 | } |
118 | ||
119 | void | |
d4f3574e SS |
120 | print_387_control_word (control) |
121 | unsigned int control; | |
122 | { | |
123 | printf_filtered ("control %s:", local_hex_string(control & 0xffff)); | |
124 | print_387_control_bits (control); | |
125 | puts_unfiltered ("\n"); | |
126 | } | |
127 | ||
128 | static void | |
129 | print_387_status_bits (status) | |
c906108c SS |
130 | unsigned int status; |
131 | { | |
d4f3574e | 132 | printf_unfiltered (" flags %d%d%d%d; ", |
c5aa993b JM |
133 | (status & 0x4000) != 0, |
134 | (status & 0x0400) != 0, | |
135 | (status & 0x0200) != 0, | |
136 | (status & 0x0100) != 0); | |
d4f3574e SS |
137 | printf_unfiltered ("top %d; ", (status >> 11) & 7); |
138 | if (status & 0xff) | |
139 | { | |
140 | puts_unfiltered ("excep"); | |
141 | if (status & 0x0001) puts_unfiltered (" INVAL"); | |
142 | if (status & 0x0002) puts_unfiltered (" DENOR"); | |
143 | if (status & 0x0004) puts_unfiltered (" DIVZ"); | |
144 | if (status & 0x0008) puts_unfiltered (" OVERF"); | |
145 | if (status & 0x0010) puts_unfiltered (" UNDER"); | |
146 | if (status & 0x0020) puts_unfiltered (" LOS"); | |
147 | if (status & 0x0040) puts_unfiltered (" STACK"); | |
148 | } | |
149 | } | |
150 | ||
151 | void | |
152 | print_387_status_word (status) | |
153 | unsigned int status; | |
154 | { | |
155 | printf_filtered ("status %s:", local_hex_string (status & 0xffff)); | |
156 | print_387_status_bits (status); | |
157 | puts_unfiltered ("\n"); | |
158 | } | |
159 | ||
de57eccd JM |
160 | \f |
161 | /* Implement the `info float' layout based on the register definitions | |
162 | in `tm-i386.h'. */ | |
163 | ||
164 | /* Print the floating point number specified by RAW. */ | |
165 | static void | |
166 | print_i387_value (char *raw) | |
167 | { | |
168 | DOUBLEST value; | |
169 | ||
170 | floatformat_to_doublest (&floatformat_i387_ext, raw, &value); | |
171 | ||
172 | /* We try to print 19 digits. The last digit may or may not contain | |
173 | garbage, but we'd better print one too many. We need enough room | |
174 | to print the value, 1 position for the sign, 1 for the decimal | |
175 | point, 19 for the digits and 6 for the exponent adds up to 27. */ | |
176 | #ifdef PRINTF_HAS_LONG_DOUBLE | |
177 | printf_filtered (" %-+27.19Lg", (long double) value); | |
178 | #else | |
179 | printf_filtered (" %-+27.19g", (double) value); | |
180 | #endif | |
181 | } | |
182 | ||
183 | /* Print the classification for the register contents RAW. */ | |
184 | static void | |
185 | print_i387_ext (unsigned char *raw) | |
186 | { | |
187 | int sign; | |
188 | int integer; | |
189 | unsigned int exponent; | |
190 | unsigned long fraction[2]; | |
191 | ||
192 | sign = raw[9] & 0x80; | |
193 | integer = raw[7] & 0x80; | |
194 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
195 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
196 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
197 | | (raw[5] << 8) | raw[4]); | |
198 | ||
199 | if (exponent == 0x7fff && integer) | |
200 | { | |
201 | if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) | |
202 | /* Infinity. */ | |
203 | printf_filtered (" %cInf", (sign ? '-' : '+')); | |
204 | else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) | |
205 | /* Real Indefinite (QNaN). */ | |
206 | puts_unfiltered (" Real Indefinite (QNaN)"); | |
207 | else if (fraction[1] & 0x40000000) | |
208 | /* QNaN. */ | |
209 | puts_filtered (" QNaN"); | |
210 | else | |
211 | /* SNaN. */ | |
212 | puts_filtered (" SNaN"); | |
213 | } | |
214 | else if (exponent < 0x7fff && exponent > 0x0000 && integer) | |
215 | /* Normal. */ | |
216 | print_i387_value (raw); | |
217 | else if (exponent == 0x0000) | |
218 | { | |
219 | /* Denormal or zero. */ | |
220 | print_i387_value (raw); | |
221 | ||
222 | if (integer) | |
223 | /* Pseudo-denormal. */ | |
224 | puts_filtered (" Pseudo-denormal"); | |
225 | else if (fraction[0] || fraction[1]) | |
226 | /* Denormal. */ | |
227 | puts_filtered (" Denormal"); | |
228 | } | |
229 | else | |
230 | /* Unsupported. */ | |
231 | puts_filtered (" Unsupported"); | |
232 | } | |
233 | ||
234 | /* Print the status word STATUS. */ | |
235 | static void | |
236 | print_i387_status_word (unsigned int status) | |
237 | { | |
238 | printf_filtered ("Status Word: %s", | |
239 | local_hex_string_custom (status, "04")); | |
240 | puts_filtered (" "); | |
241 | printf_filtered (" %s", (status & 0x0001) ? "IE" : " "); | |
242 | printf_filtered (" %s", (status & 0x0002) ? "DE" : " "); | |
243 | printf_filtered (" %s", (status & 0x0004) ? "ZE" : " "); | |
244 | printf_filtered (" %s", (status & 0x0008) ? "OE" : " "); | |
245 | printf_filtered (" %s", (status & 0x0010) ? "UE" : " "); | |
246 | printf_filtered (" %s", (status & 0x0020) ? "PE" : " "); | |
247 | puts_filtered (" "); | |
248 | printf_filtered (" %s", (status & 0x0080) ? "ES" : " "); | |
249 | puts_filtered (" "); | |
250 | printf_filtered (" %s", (status & 0x0080) ? "SF" : " "); | |
251 | puts_filtered (" "); | |
252 | printf_filtered (" %s", (status & 0x0100) ? "C0" : " "); | |
253 | printf_filtered (" %s", (status & 0x0200) ? "C1" : " "); | |
254 | printf_filtered (" %s", (status & 0x0400) ? "C2" : " "); | |
255 | printf_filtered (" %s", (status & 0x4000) ? "C3" : " "); | |
256 | ||
257 | puts_filtered ("\n"); | |
258 | ||
259 | printf_filtered (" TOP: %d\n", ((status >> 11) & 7)); | |
260 | } | |
261 | ||
262 | /* Print the control word CONTROL. */ | |
263 | static void | |
264 | print_i387_control_word (unsigned int control) | |
265 | { | |
266 | printf_filtered ("Control Word: %s", | |
267 | local_hex_string_custom (control, "04")); | |
268 | puts_filtered (" "); | |
269 | printf_filtered (" %s", (control & 0x0001) ? "IM" : " "); | |
270 | printf_filtered (" %s", (control & 0x0002) ? "DM" : " "); | |
271 | printf_filtered (" %s", (control & 0x0004) ? "ZM" : " "); | |
272 | printf_filtered (" %s", (control & 0x0008) ? "OM" : " "); | |
273 | printf_filtered (" %s", (control & 0x0010) ? "UM" : " "); | |
274 | printf_filtered (" %s", (control & 0x0020) ? "PM" : " "); | |
275 | ||
276 | puts_filtered ("\n"); | |
277 | ||
278 | puts_filtered (" PC: "); | |
279 | switch ((control >> 8) & 3) | |
280 | { | |
281 | case 0: | |
282 | puts_filtered ("Single Precision (24-bits)\n"); | |
283 | break; | |
284 | case 1: | |
285 | puts_filtered ("Reserved\n"); | |
286 | break; | |
287 | case 2: | |
288 | puts_filtered ("Double Precision (53-bits)\n"); | |
289 | break; | |
290 | case 3: | |
291 | puts_filtered ("Extended Precision (64-bits)\n"); | |
292 | break; | |
293 | } | |
294 | ||
295 | puts_filtered (" RC: "); | |
296 | switch ((control >> 10) & 3) | |
297 | { | |
298 | case 0: | |
299 | puts_filtered ("Round to nearest\n"); | |
300 | break; | |
301 | case 1: | |
302 | puts_filtered ("Round down\n"); | |
303 | break; | |
304 | case 2: | |
305 | puts_filtered ("Round up\n"); | |
306 | break; | |
307 | case 3: | |
308 | puts_filtered ("Round toward zero\n"); | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | /* Print out the i387 floating poin state. */ | |
314 | void | |
315 | i387_float_info (void) | |
316 | { | |
317 | unsigned int fctrl; | |
318 | unsigned int fstat; | |
319 | unsigned int ftag; | |
320 | unsigned int fiseg; | |
321 | unsigned int fioff; | |
322 | unsigned int foseg; | |
323 | unsigned int fooff; | |
324 | unsigned int fop; | |
325 | int fpreg; | |
326 | int top; | |
327 | ||
328 | fctrl = read_register (FCTRL_REGNUM); | |
329 | fstat = read_register (FSTAT_REGNUM); | |
330 | ftag = read_register (FTAG_REGNUM); | |
331 | fiseg = read_register (FCS_REGNUM); | |
332 | fioff = read_register (FCOFF_REGNUM); | |
333 | foseg = read_register (FDS_REGNUM); | |
334 | fooff = read_register (FDOFF_REGNUM); | |
335 | fop = read_register (FOP_REGNUM); | |
336 | ||
337 | top = ((fstat >> 11) & 7); | |
338 | ||
339 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
340 | { | |
341 | unsigned char raw[FPU_REG_RAW_SIZE]; | |
342 | int tag = (ftag >> (fpreg * 2)) & 3; | |
343 | int i; | |
344 | ||
345 | printf_filtered ("%sR%d: ", fpreg == top ? "=>" : " ", fpreg); | |
346 | ||
347 | switch (tag) | |
348 | { | |
349 | case 0: | |
350 | puts_filtered ("Valid "); | |
351 | break; | |
352 | case 1: | |
353 | puts_filtered ("Zero "); | |
354 | break; | |
355 | case 2: | |
356 | puts_filtered ("Special "); | |
357 | break; | |
358 | case 3: | |
359 | puts_filtered ("Empty "); | |
360 | break; | |
361 | } | |
362 | ||
363 | read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw); | |
364 | ||
365 | puts_filtered ("0x"); | |
366 | for (i = 9; i >= 0; i--) | |
367 | printf_filtered ("%02x", raw[i]); | |
368 | ||
369 | if (tag != 3) | |
370 | print_i387_ext (raw); | |
371 | ||
372 | puts_filtered ("\n"); | |
373 | } | |
374 | ||
375 | puts_filtered ("\n"); | |
376 | ||
377 | print_i387_status_word (fstat); | |
378 | print_i387_control_word (fctrl); | |
379 | printf_filtered ("Tag Word: %s\n", | |
380 | local_hex_string_custom (ftag, "04")); | |
381 | printf_filtered ("Instruction Pointer: %s:", | |
382 | local_hex_string_custom (fiseg, "02")); | |
383 | printf_filtered ("%s\n", local_hex_string_custom (fioff, "08")); | |
384 | printf_filtered ("Operand Pointer: %s:", | |
385 | local_hex_string_custom (foseg, "02")); | |
386 | printf_filtered ("%s\n", local_hex_string_custom (fooff, "08")); | |
387 | printf_filtered ("Opcode: %s\n", | |
388 | local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); | |
389 | } | |
390 | ||
391 | \f | |
392 | /* FIXME: The functions on this page are used to provide `long double' | |
393 | support for Linux. However, the approach does not seem to be the | |
394 | right one, and we are planning to solve this in a way that should | |
395 | work for all i386 targets. These functions will disappear in the | |
396 | near future, so please don't use them. */ | |
d4f3574e SS |
397 | #ifdef LD_I387 |
398 | int | |
399 | i387_extract_floating (PTR addr, int len, DOUBLEST *dretptr) | |
400 | { | |
401 | if (len == TARGET_LONG_DOUBLE_BIT / 8) | |
402 | { | |
403 | if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) | |
404 | { | |
405 | DOUBLEST retval; | |
406 | ||
407 | memcpy (dretptr, addr, sizeof (retval)); | |
408 | } | |
409 | else | |
410 | floatformat_to_doublest (TARGET_LONG_DOUBLE_FORMAT, addr, dretptr); | |
411 | ||
412 | return 1; | |
413 | } | |
414 | else | |
415 | return 0; | |
416 | } | |
417 | ||
418 | int | |
419 | i387_store_floating (PTR addr, int len, DOUBLEST val) | |
420 | { | |
421 | if (len == TARGET_LONG_DOUBLE_BIT / 8) | |
422 | { | |
423 | /* This `if' may be totally stupid. I just put it in here to be | |
424 | absolutely sure I'm preserving the semantics of the code I'm | |
425 | frobbing, while I try to maintain portability boundaries; I | |
426 | don't actually know exactly what it's doing. -JimB, May 1999 */ | |
427 | if (HOST_LONG_DOUBLE_FORMAT == TARGET_LONG_DOUBLE_FORMAT) | |
428 | memcpy (addr, &val, sizeof (val)); | |
429 | else | |
430 | floatformat_from_doublest (TARGET_LONG_DOUBLE_FORMAT, &val, addr); | |
431 | ||
432 | return 1; | |
433 | } | |
434 | else | |
435 | return 0; | |
c906108c | 436 | } |
d4f3574e | 437 | #endif /* LD_I387 */ |