Commit | Line | Data |
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c906108c | 1 | /* Intel 387 floating point stuff. |
b6ba6518 KB |
2 | Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, 2001 |
3 | Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "language.h" | |
d4f3574e | 26 | #include "value.h" |
c906108c SS |
27 | #include "gdbcore.h" |
28 | #include "floatformat.h" | |
4e052eda | 29 | #include "regcache.h" |
d0df8472 | 30 | #include "gdb_assert.h" |
c906108c | 31 | |
c906108c | 32 | |
de57eccd JM |
33 | /* FIXME: Eliminate the next two functions when we have the time to |
34 | change all the callers. */ | |
d4f3574e | 35 | |
a14ed312 KB |
36 | void i387_to_double (char *from, char *to); |
37 | void double_to_i387 (char *from, char *to); | |
c906108c SS |
38 | |
39 | void | |
fba45db2 | 40 | i387_to_double (char *from, char *to) |
c906108c | 41 | { |
c5aa993b | 42 | floatformat_to_double (&floatformat_i387_ext, from, (double *) to); |
c906108c SS |
43 | } |
44 | ||
45 | void | |
fba45db2 | 46 | double_to_i387 (char *from, char *to) |
c906108c | 47 | { |
c5aa993b | 48 | floatformat_from_double (&floatformat_i387_ext, (double *) from, to); |
c906108c SS |
49 | } |
50 | ||
de57eccd JM |
51 | \f |
52 | /* FIXME: The functions on this page are used by the old `info float' | |
53 | implementations that a few of the i386 targets provide. These | |
54 | functions should be removed if all of these have been converted to | |
55 | use the generic implementation based on the new register file | |
56 | layout. */ | |
57 | ||
a14ed312 KB |
58 | static void print_387_control_bits (unsigned int control); |
59 | static void print_387_status_bits (unsigned int status); | |
de57eccd | 60 | |
d4f3574e | 61 | static void |
fba45db2 | 62 | print_387_control_bits (unsigned int control) |
c906108c | 63 | { |
c5aa993b | 64 | switch ((control >> 8) & 3) |
c906108c | 65 | { |
c5aa993b | 66 | case 0: |
d4f3574e | 67 | puts_unfiltered (" 24 bit; "); |
c5aa993b JM |
68 | break; |
69 | case 1: | |
d4f3574e | 70 | puts_unfiltered (" (bad); "); |
c5aa993b JM |
71 | break; |
72 | case 2: | |
d4f3574e | 73 | puts_unfiltered (" 53 bit; "); |
c5aa993b JM |
74 | break; |
75 | case 3: | |
d4f3574e | 76 | puts_unfiltered (" 64 bit; "); |
c5aa993b | 77 | break; |
c906108c | 78 | } |
c5aa993b | 79 | switch ((control >> 10) & 3) |
c906108c | 80 | { |
c5aa993b | 81 | case 0: |
d4f3574e | 82 | puts_unfiltered ("NEAR; "); |
c5aa993b JM |
83 | break; |
84 | case 1: | |
d4f3574e | 85 | puts_unfiltered ("DOWN; "); |
c5aa993b JM |
86 | break; |
87 | case 2: | |
d4f3574e | 88 | puts_unfiltered ("UP; "); |
c5aa993b JM |
89 | break; |
90 | case 3: | |
d4f3574e | 91 | puts_unfiltered ("CHOP; "); |
c5aa993b | 92 | break; |
c906108c | 93 | } |
c5aa993b | 94 | if (control & 0x3f) |
c906108c | 95 | { |
d4f3574e | 96 | puts_unfiltered ("mask"); |
c5aa993b | 97 | if (control & 0x0001) |
d4f3574e | 98 | puts_unfiltered (" INVAL"); |
c5aa993b | 99 | if (control & 0x0002) |
d4f3574e | 100 | puts_unfiltered (" DENOR"); |
c5aa993b | 101 | if (control & 0x0004) |
d4f3574e | 102 | puts_unfiltered (" DIVZ"); |
c5aa993b | 103 | if (control & 0x0008) |
d4f3574e | 104 | puts_unfiltered (" OVERF"); |
c5aa993b | 105 | if (control & 0x0010) |
d4f3574e | 106 | puts_unfiltered (" UNDER"); |
c5aa993b | 107 | if (control & 0x0020) |
d4f3574e SS |
108 | puts_unfiltered (" LOS"); |
109 | puts_unfiltered (";"); | |
c906108c | 110 | } |
cff3e48b | 111 | |
c5aa993b | 112 | if (control & 0xe080) |
d4f3574e | 113 | warning ("\nreserved bits on: %s", |
c5aa993b | 114 | local_hex_string (control & 0xe080)); |
c906108c SS |
115 | } |
116 | ||
117 | void | |
fba45db2 | 118 | print_387_control_word (unsigned int control) |
d4f3574e SS |
119 | { |
120 | printf_filtered ("control %s:", local_hex_string(control & 0xffff)); | |
121 | print_387_control_bits (control); | |
122 | puts_unfiltered ("\n"); | |
123 | } | |
124 | ||
125 | static void | |
fba45db2 | 126 | print_387_status_bits (unsigned int status) |
c906108c | 127 | { |
d4f3574e | 128 | printf_unfiltered (" flags %d%d%d%d; ", |
c5aa993b JM |
129 | (status & 0x4000) != 0, |
130 | (status & 0x0400) != 0, | |
131 | (status & 0x0200) != 0, | |
132 | (status & 0x0100) != 0); | |
d4f3574e SS |
133 | printf_unfiltered ("top %d; ", (status >> 11) & 7); |
134 | if (status & 0xff) | |
135 | { | |
136 | puts_unfiltered ("excep"); | |
137 | if (status & 0x0001) puts_unfiltered (" INVAL"); | |
138 | if (status & 0x0002) puts_unfiltered (" DENOR"); | |
139 | if (status & 0x0004) puts_unfiltered (" DIVZ"); | |
140 | if (status & 0x0008) puts_unfiltered (" OVERF"); | |
141 | if (status & 0x0010) puts_unfiltered (" UNDER"); | |
142 | if (status & 0x0020) puts_unfiltered (" LOS"); | |
143 | if (status & 0x0040) puts_unfiltered (" STACK"); | |
144 | } | |
145 | } | |
146 | ||
147 | void | |
fba45db2 | 148 | print_387_status_word (unsigned int status) |
d4f3574e SS |
149 | { |
150 | printf_filtered ("status %s:", local_hex_string (status & 0xffff)); | |
151 | print_387_status_bits (status); | |
152 | puts_unfiltered ("\n"); | |
153 | } | |
154 | ||
de57eccd JM |
155 | \f |
156 | /* Implement the `info float' layout based on the register definitions | |
157 | in `tm-i386.h'. */ | |
158 | ||
159 | /* Print the floating point number specified by RAW. */ | |
160 | static void | |
161 | print_i387_value (char *raw) | |
162 | { | |
163 | DOUBLEST value; | |
d0df8472 AC |
164 | int len = TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT; |
165 | char *tmp = alloca (len); | |
166 | ||
167 | /* This code only works on targets where ... */ | |
168 | gdb_assert (TARGET_LONG_DOUBLE_FORMAT == &floatformat_i387_ext); | |
169 | ||
170 | /* Take care of the padding. FP reg is 80 bits. The same value in | |
c96646d0 | 171 | memory is 96 bits. */ |
d0df8472 | 172 | gdb_assert (FPU_REG_RAW_SIZE < len); |
7f1659e6 MC |
173 | memcpy (tmp, raw, FPU_REG_RAW_SIZE); |
174 | memset (tmp + FPU_REG_RAW_SIZE, 0, len - FPU_REG_RAW_SIZE); | |
d0df8472 AC |
175 | |
176 | /* Extract the value as a DOUBLEST. */ | |
177 | /* Use extract_floating() rather than floatformat_to_doublest(). | |
178 | The latter is lossy in nature. Once GDB gets a host/target | |
179 | independent and non-lossy FP it will become possible to bypass | |
180 | extract_floating() and call floatformat*() directly. Note also | |
181 | the assumptions about TARGET_LONG_DOUBLE above. */ | |
182 | value = extract_floating (tmp, len); | |
de57eccd JM |
183 | |
184 | /* We try to print 19 digits. The last digit may or may not contain | |
185 | garbage, but we'd better print one too many. We need enough room | |
186 | to print the value, 1 position for the sign, 1 for the decimal | |
187 | point, 19 for the digits and 6 for the exponent adds up to 27. */ | |
188 | #ifdef PRINTF_HAS_LONG_DOUBLE | |
189 | printf_filtered (" %-+27.19Lg", (long double) value); | |
190 | #else | |
191 | printf_filtered (" %-+27.19g", (double) value); | |
192 | #endif | |
193 | } | |
194 | ||
195 | /* Print the classification for the register contents RAW. */ | |
196 | static void | |
197 | print_i387_ext (unsigned char *raw) | |
198 | { | |
199 | int sign; | |
200 | int integer; | |
201 | unsigned int exponent; | |
202 | unsigned long fraction[2]; | |
203 | ||
204 | sign = raw[9] & 0x80; | |
205 | integer = raw[7] & 0x80; | |
206 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
207 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
208 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
209 | | (raw[5] << 8) | raw[4]); | |
210 | ||
211 | if (exponent == 0x7fff && integer) | |
212 | { | |
213 | if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) | |
214 | /* Infinity. */ | |
215 | printf_filtered (" %cInf", (sign ? '-' : '+')); | |
216 | else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) | |
217 | /* Real Indefinite (QNaN). */ | |
218 | puts_unfiltered (" Real Indefinite (QNaN)"); | |
219 | else if (fraction[1] & 0x40000000) | |
220 | /* QNaN. */ | |
221 | puts_filtered (" QNaN"); | |
222 | else | |
223 | /* SNaN. */ | |
224 | puts_filtered (" SNaN"); | |
225 | } | |
226 | else if (exponent < 0x7fff && exponent > 0x0000 && integer) | |
227 | /* Normal. */ | |
228 | print_i387_value (raw); | |
229 | else if (exponent == 0x0000) | |
230 | { | |
231 | /* Denormal or zero. */ | |
232 | print_i387_value (raw); | |
233 | ||
234 | if (integer) | |
235 | /* Pseudo-denormal. */ | |
236 | puts_filtered (" Pseudo-denormal"); | |
237 | else if (fraction[0] || fraction[1]) | |
238 | /* Denormal. */ | |
239 | puts_filtered (" Denormal"); | |
240 | } | |
241 | else | |
242 | /* Unsupported. */ | |
243 | puts_filtered (" Unsupported"); | |
244 | } | |
245 | ||
246 | /* Print the status word STATUS. */ | |
247 | static void | |
248 | print_i387_status_word (unsigned int status) | |
249 | { | |
250 | printf_filtered ("Status Word: %s", | |
251 | local_hex_string_custom (status, "04")); | |
252 | puts_filtered (" "); | |
253 | printf_filtered (" %s", (status & 0x0001) ? "IE" : " "); | |
254 | printf_filtered (" %s", (status & 0x0002) ? "DE" : " "); | |
255 | printf_filtered (" %s", (status & 0x0004) ? "ZE" : " "); | |
256 | printf_filtered (" %s", (status & 0x0008) ? "OE" : " "); | |
257 | printf_filtered (" %s", (status & 0x0010) ? "UE" : " "); | |
258 | printf_filtered (" %s", (status & 0x0020) ? "PE" : " "); | |
259 | puts_filtered (" "); | |
260 | printf_filtered (" %s", (status & 0x0080) ? "ES" : " "); | |
261 | puts_filtered (" "); | |
96836138 | 262 | printf_filtered (" %s", (status & 0x0040) ? "SF" : " "); |
de57eccd JM |
263 | puts_filtered (" "); |
264 | printf_filtered (" %s", (status & 0x0100) ? "C0" : " "); | |
265 | printf_filtered (" %s", (status & 0x0200) ? "C1" : " "); | |
266 | printf_filtered (" %s", (status & 0x0400) ? "C2" : " "); | |
267 | printf_filtered (" %s", (status & 0x4000) ? "C3" : " "); | |
268 | ||
269 | puts_filtered ("\n"); | |
270 | ||
271 | printf_filtered (" TOP: %d\n", ((status >> 11) & 7)); | |
272 | } | |
273 | ||
274 | /* Print the control word CONTROL. */ | |
275 | static void | |
276 | print_i387_control_word (unsigned int control) | |
277 | { | |
278 | printf_filtered ("Control Word: %s", | |
279 | local_hex_string_custom (control, "04")); | |
280 | puts_filtered (" "); | |
281 | printf_filtered (" %s", (control & 0x0001) ? "IM" : " "); | |
282 | printf_filtered (" %s", (control & 0x0002) ? "DM" : " "); | |
283 | printf_filtered (" %s", (control & 0x0004) ? "ZM" : " "); | |
284 | printf_filtered (" %s", (control & 0x0008) ? "OM" : " "); | |
285 | printf_filtered (" %s", (control & 0x0010) ? "UM" : " "); | |
286 | printf_filtered (" %s", (control & 0x0020) ? "PM" : " "); | |
287 | ||
288 | puts_filtered ("\n"); | |
289 | ||
290 | puts_filtered (" PC: "); | |
291 | switch ((control >> 8) & 3) | |
292 | { | |
293 | case 0: | |
294 | puts_filtered ("Single Precision (24-bits)\n"); | |
295 | break; | |
296 | case 1: | |
297 | puts_filtered ("Reserved\n"); | |
298 | break; | |
299 | case 2: | |
300 | puts_filtered ("Double Precision (53-bits)\n"); | |
301 | break; | |
302 | case 3: | |
303 | puts_filtered ("Extended Precision (64-bits)\n"); | |
304 | break; | |
305 | } | |
306 | ||
307 | puts_filtered (" RC: "); | |
308 | switch ((control >> 10) & 3) | |
309 | { | |
310 | case 0: | |
311 | puts_filtered ("Round to nearest\n"); | |
312 | break; | |
313 | case 1: | |
314 | puts_filtered ("Round down\n"); | |
315 | break; | |
316 | case 2: | |
317 | puts_filtered ("Round up\n"); | |
318 | break; | |
319 | case 3: | |
320 | puts_filtered ("Round toward zero\n"); | |
321 | break; | |
322 | } | |
323 | } | |
324 | ||
325 | /* Print out the i387 floating poin state. */ | |
326 | void | |
327 | i387_float_info (void) | |
328 | { | |
329 | unsigned int fctrl; | |
330 | unsigned int fstat; | |
331 | unsigned int ftag; | |
332 | unsigned int fiseg; | |
333 | unsigned int fioff; | |
334 | unsigned int foseg; | |
335 | unsigned int fooff; | |
336 | unsigned int fop; | |
337 | int fpreg; | |
338 | int top; | |
339 | ||
340 | fctrl = read_register (FCTRL_REGNUM); | |
341 | fstat = read_register (FSTAT_REGNUM); | |
342 | ftag = read_register (FTAG_REGNUM); | |
343 | fiseg = read_register (FCS_REGNUM); | |
344 | fioff = read_register (FCOFF_REGNUM); | |
345 | foseg = read_register (FDS_REGNUM); | |
346 | fooff = read_register (FDOFF_REGNUM); | |
347 | fop = read_register (FOP_REGNUM); | |
348 | ||
349 | top = ((fstat >> 11) & 7); | |
350 | ||
351 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
352 | { | |
353 | unsigned char raw[FPU_REG_RAW_SIZE]; | |
354 | int tag = (ftag >> (fpreg * 2)) & 3; | |
355 | int i; | |
356 | ||
357 | printf_filtered ("%sR%d: ", fpreg == top ? "=>" : " ", fpreg); | |
358 | ||
359 | switch (tag) | |
360 | { | |
361 | case 0: | |
362 | puts_filtered ("Valid "); | |
363 | break; | |
364 | case 1: | |
365 | puts_filtered ("Zero "); | |
366 | break; | |
367 | case 2: | |
368 | puts_filtered ("Special "); | |
369 | break; | |
370 | case 3: | |
371 | puts_filtered ("Empty "); | |
372 | break; | |
373 | } | |
374 | ||
375 | read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw); | |
376 | ||
377 | puts_filtered ("0x"); | |
378 | for (i = 9; i >= 0; i--) | |
379 | printf_filtered ("%02x", raw[i]); | |
380 | ||
381 | if (tag != 3) | |
382 | print_i387_ext (raw); | |
383 | ||
384 | puts_filtered ("\n"); | |
385 | } | |
386 | ||
387 | puts_filtered ("\n"); | |
388 | ||
389 | print_i387_status_word (fstat); | |
390 | print_i387_control_word (fctrl); | |
391 | printf_filtered ("Tag Word: %s\n", | |
392 | local_hex_string_custom (ftag, "04")); | |
393 | printf_filtered ("Instruction Pointer: %s:", | |
394 | local_hex_string_custom (fiseg, "02")); | |
395 | printf_filtered ("%s\n", local_hex_string_custom (fioff, "08")); | |
396 | printf_filtered ("Operand Pointer: %s:", | |
397 | local_hex_string_custom (foseg, "02")); | |
398 | printf_filtered ("%s\n", local_hex_string_custom (fooff, "08")); | |
399 | printf_filtered ("Opcode: %s\n", | |
400 | local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); | |
401 | } |