Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Intel 387 floating point stuff. |
dff95cc7 MK |
2 | Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, |
3 | 2001, 2002 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" |
309367d4 | 31 | #include "gdb_string.h" |
d16aafd8 | 32 | #include "doublest.h" |
c906108c | 33 | |
9a82579f | 34 | #include "i386-tdep.h" |
c906108c | 35 | |
de57eccd JM |
36 | /* FIXME: Eliminate the next two functions when we have the time to |
37 | change all the callers. */ | |
d4f3574e | 38 | |
a14ed312 KB |
39 | void i387_to_double (char *from, char *to); |
40 | void double_to_i387 (char *from, char *to); | |
c906108c SS |
41 | |
42 | void | |
fba45db2 | 43 | i387_to_double (char *from, char *to) |
c906108c | 44 | { |
c5aa993b | 45 | floatformat_to_double (&floatformat_i387_ext, from, (double *) to); |
c906108c SS |
46 | } |
47 | ||
48 | void | |
fba45db2 | 49 | double_to_i387 (char *from, char *to) |
c906108c | 50 | { |
c5aa993b | 51 | floatformat_from_double (&floatformat_i387_ext, (double *) from, to); |
c906108c SS |
52 | } |
53 | ||
de57eccd JM |
54 | \f |
55 | /* FIXME: The functions on this page are used by the old `info float' | |
56 | implementations that a few of the i386 targets provide. These | |
57 | functions should be removed if all of these have been converted to | |
58 | use the generic implementation based on the new register file | |
59 | layout. */ | |
60 | ||
a14ed312 KB |
61 | static void print_387_control_bits (unsigned int control); |
62 | static void print_387_status_bits (unsigned int status); | |
de57eccd | 63 | |
d4f3574e | 64 | static void |
fba45db2 | 65 | print_387_control_bits (unsigned int control) |
c906108c | 66 | { |
c5aa993b | 67 | switch ((control >> 8) & 3) |
c906108c | 68 | { |
c5aa993b | 69 | case 0: |
d4f3574e | 70 | puts_unfiltered (" 24 bit; "); |
c5aa993b JM |
71 | break; |
72 | case 1: | |
d4f3574e | 73 | puts_unfiltered (" (bad); "); |
c5aa993b JM |
74 | break; |
75 | case 2: | |
d4f3574e | 76 | puts_unfiltered (" 53 bit; "); |
c5aa993b JM |
77 | break; |
78 | case 3: | |
d4f3574e | 79 | puts_unfiltered (" 64 bit; "); |
c5aa993b | 80 | break; |
c906108c | 81 | } |
c5aa993b | 82 | switch ((control >> 10) & 3) |
c906108c | 83 | { |
c5aa993b | 84 | case 0: |
d4f3574e | 85 | puts_unfiltered ("NEAR; "); |
c5aa993b JM |
86 | break; |
87 | case 1: | |
d4f3574e | 88 | puts_unfiltered ("DOWN; "); |
c5aa993b JM |
89 | break; |
90 | case 2: | |
d4f3574e | 91 | puts_unfiltered ("UP; "); |
c5aa993b JM |
92 | break; |
93 | case 3: | |
d4f3574e | 94 | puts_unfiltered ("CHOP; "); |
c5aa993b | 95 | break; |
c906108c | 96 | } |
c5aa993b | 97 | if (control & 0x3f) |
c906108c | 98 | { |
d4f3574e | 99 | puts_unfiltered ("mask"); |
c5aa993b | 100 | if (control & 0x0001) |
d4f3574e | 101 | puts_unfiltered (" INVAL"); |
c5aa993b | 102 | if (control & 0x0002) |
d4f3574e | 103 | puts_unfiltered (" DENOR"); |
c5aa993b | 104 | if (control & 0x0004) |
d4f3574e | 105 | puts_unfiltered (" DIVZ"); |
c5aa993b | 106 | if (control & 0x0008) |
d4f3574e | 107 | puts_unfiltered (" OVERF"); |
c5aa993b | 108 | if (control & 0x0010) |
d4f3574e | 109 | puts_unfiltered (" UNDER"); |
c5aa993b | 110 | if (control & 0x0020) |
d4f3574e SS |
111 | puts_unfiltered (" LOS"); |
112 | puts_unfiltered (";"); | |
c906108c | 113 | } |
cff3e48b | 114 | |
c5aa993b | 115 | if (control & 0xe080) |
d4f3574e | 116 | warning ("\nreserved bits on: %s", |
c5aa993b | 117 | local_hex_string (control & 0xe080)); |
c906108c SS |
118 | } |
119 | ||
120 | void | |
fba45db2 | 121 | print_387_control_word (unsigned int control) |
d4f3574e SS |
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 | |
fba45db2 | 129 | print_387_status_bits (unsigned int status) |
c906108c | 130 | { |
d4f3574e | 131 | printf_unfiltered (" flags %d%d%d%d; ", |
c5aa993b JM |
132 | (status & 0x4000) != 0, |
133 | (status & 0x0400) != 0, | |
134 | (status & 0x0200) != 0, | |
135 | (status & 0x0100) != 0); | |
d4f3574e SS |
136 | printf_unfiltered ("top %d; ", (status >> 11) & 7); |
137 | if (status & 0xff) | |
138 | { | |
139 | puts_unfiltered ("excep"); | |
140 | if (status & 0x0001) puts_unfiltered (" INVAL"); | |
141 | if (status & 0x0002) puts_unfiltered (" DENOR"); | |
142 | if (status & 0x0004) puts_unfiltered (" DIVZ"); | |
143 | if (status & 0x0008) puts_unfiltered (" OVERF"); | |
144 | if (status & 0x0010) puts_unfiltered (" UNDER"); | |
145 | if (status & 0x0020) puts_unfiltered (" LOS"); | |
146 | if (status & 0x0040) puts_unfiltered (" STACK"); | |
147 | } | |
148 | } | |
149 | ||
150 | void | |
fba45db2 | 151 | print_387_status_word (unsigned int status) |
d4f3574e SS |
152 | { |
153 | printf_filtered ("status %s:", local_hex_string (status & 0xffff)); | |
154 | print_387_status_bits (status); | |
155 | puts_unfiltered ("\n"); | |
156 | } | |
157 | ||
de57eccd JM |
158 | \f |
159 | /* Implement the `info float' layout based on the register definitions | |
160 | in `tm-i386.h'. */ | |
161 | ||
162 | /* Print the floating point number specified by RAW. */ | |
163 | static void | |
61113f8b | 164 | print_i387_value (char *raw, struct ui_file *file) |
de57eccd JM |
165 | { |
166 | DOUBLEST value; | |
4583280c MK |
167 | |
168 | /* Using extract_typed_floating here might affect the representation | |
169 | of certain numbers such as NaNs, even if GDB is running natively. | |
170 | This is fine since our caller already detects such special | |
171 | numbers and we print the hexadecimal representation anyway. */ | |
172 | value = extract_typed_floating (raw, builtin_type_i387_ext); | |
de57eccd JM |
173 | |
174 | /* We try to print 19 digits. The last digit may or may not contain | |
175 | garbage, but we'd better print one too many. We need enough room | |
176 | to print the value, 1 position for the sign, 1 for the decimal | |
177 | point, 19 for the digits and 6 for the exponent adds up to 27. */ | |
178 | #ifdef PRINTF_HAS_LONG_DOUBLE | |
61113f8b | 179 | fprintf_filtered (file, " %-+27.19Lg", (long double) value); |
de57eccd | 180 | #else |
61113f8b | 181 | fprintf_filtered (file, " %-+27.19g", (double) value); |
de57eccd JM |
182 | #endif |
183 | } | |
184 | ||
185 | /* Print the classification for the register contents RAW. */ | |
186 | static void | |
61113f8b | 187 | print_i387_ext (unsigned char *raw, struct ui_file *file) |
de57eccd JM |
188 | { |
189 | int sign; | |
190 | int integer; | |
191 | unsigned int exponent; | |
192 | unsigned long fraction[2]; | |
193 | ||
194 | sign = raw[9] & 0x80; | |
195 | integer = raw[7] & 0x80; | |
196 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
197 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
198 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
199 | | (raw[5] << 8) | raw[4]); | |
200 | ||
201 | if (exponent == 0x7fff && integer) | |
202 | { | |
203 | if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) | |
204 | /* Infinity. */ | |
61113f8b | 205 | fprintf_filtered (file, " %cInf", (sign ? '-' : '+')); |
de57eccd JM |
206 | else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) |
207 | /* Real Indefinite (QNaN). */ | |
61113f8b | 208 | fputs_unfiltered (" Real Indefinite (QNaN)", file); |
de57eccd JM |
209 | else if (fraction[1] & 0x40000000) |
210 | /* QNaN. */ | |
61113f8b | 211 | fputs_filtered (" QNaN", file); |
de57eccd JM |
212 | else |
213 | /* SNaN. */ | |
61113f8b | 214 | fputs_filtered (" SNaN", file); |
de57eccd JM |
215 | } |
216 | else if (exponent < 0x7fff && exponent > 0x0000 && integer) | |
217 | /* Normal. */ | |
61113f8b | 218 | print_i387_value (raw, file); |
de57eccd JM |
219 | else if (exponent == 0x0000) |
220 | { | |
221 | /* Denormal or zero. */ | |
61113f8b | 222 | print_i387_value (raw, file); |
de57eccd JM |
223 | |
224 | if (integer) | |
225 | /* Pseudo-denormal. */ | |
61113f8b | 226 | fputs_filtered (" Pseudo-denormal", file); |
de57eccd JM |
227 | else if (fraction[0] || fraction[1]) |
228 | /* Denormal. */ | |
61113f8b | 229 | fputs_filtered (" Denormal", file); |
de57eccd JM |
230 | } |
231 | else | |
232 | /* Unsupported. */ | |
61113f8b | 233 | fputs_filtered (" Unsupported", file); |
de57eccd JM |
234 | } |
235 | ||
236 | /* Print the status word STATUS. */ | |
237 | static void | |
61113f8b | 238 | print_i387_status_word (unsigned int status, struct ui_file *file) |
de57eccd | 239 | { |
61113f8b | 240 | fprintf_filtered (file, "Status Word: %s", |
de57eccd | 241 | local_hex_string_custom (status, "04")); |
61113f8b MK |
242 | fputs_filtered (" ", file); |
243 | fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " "); | |
244 | fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " "); | |
245 | fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " "); | |
246 | fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " "); | |
247 | fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " "); | |
248 | fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " "); | |
249 | fputs_filtered (" ", file); | |
250 | fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " "); | |
251 | fputs_filtered (" ", file); | |
252 | fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " "); | |
253 | fputs_filtered (" ", file); | |
254 | fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " "); | |
255 | fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " "); | |
256 | fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " "); | |
257 | fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " "); | |
258 | ||
259 | fputs_filtered ("\n", file); | |
260 | ||
261 | fprintf_filtered (file, | |
262 | " TOP: %d\n", ((status >> 11) & 7)); | |
de57eccd JM |
263 | } |
264 | ||
265 | /* Print the control word CONTROL. */ | |
266 | static void | |
61113f8b | 267 | print_i387_control_word (unsigned int control, struct ui_file *file) |
de57eccd | 268 | { |
61113f8b | 269 | fprintf_filtered (file, "Control Word: %s", |
de57eccd | 270 | local_hex_string_custom (control, "04")); |
61113f8b MK |
271 | fputs_filtered (" ", file); |
272 | fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " "); | |
273 | fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " "); | |
274 | fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : " "); | |
275 | fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : " "); | |
276 | fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : " "); | |
277 | fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : " "); | |
de57eccd | 278 | |
61113f8b | 279 | fputs_filtered ("\n", file); |
de57eccd | 280 | |
61113f8b | 281 | fputs_filtered (" PC: ", file); |
de57eccd JM |
282 | switch ((control >> 8) & 3) |
283 | { | |
284 | case 0: | |
61113f8b | 285 | fputs_filtered ("Single Precision (24-bits)\n", file); |
de57eccd JM |
286 | break; |
287 | case 1: | |
61113f8b | 288 | fputs_filtered ("Reserved\n", file); |
de57eccd JM |
289 | break; |
290 | case 2: | |
61113f8b | 291 | fputs_filtered ("Double Precision (53-bits)\n", file); |
de57eccd JM |
292 | break; |
293 | case 3: | |
61113f8b | 294 | fputs_filtered ("Extended Precision (64-bits)\n", file); |
de57eccd JM |
295 | break; |
296 | } | |
297 | ||
61113f8b | 298 | fputs_filtered (" RC: ", file); |
de57eccd JM |
299 | switch ((control >> 10) & 3) |
300 | { | |
301 | case 0: | |
61113f8b | 302 | fputs_filtered ("Round to nearest\n", file); |
de57eccd JM |
303 | break; |
304 | case 1: | |
61113f8b | 305 | fputs_filtered ("Round down\n", file); |
de57eccd JM |
306 | break; |
307 | case 2: | |
61113f8b | 308 | fputs_filtered ("Round up\n", file); |
de57eccd JM |
309 | break; |
310 | case 3: | |
61113f8b | 311 | fputs_filtered ("Round toward zero\n", file); |
de57eccd JM |
312 | break; |
313 | } | |
314 | } | |
315 | ||
9b949a49 | 316 | /* Print out the i387 floating point state. Note that we ignore FRAME |
7d8d2918 MK |
317 | in the code below. That's OK since floating-point registers are |
318 | never saved on the stack. */ | |
319 | ||
de57eccd | 320 | void |
61113f8b | 321 | i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
8e186fd6 | 322 | struct frame_info *frame, const char *args) |
de57eccd JM |
323 | { |
324 | unsigned int fctrl; | |
325 | unsigned int fstat; | |
326 | unsigned int ftag; | |
327 | unsigned int fiseg; | |
328 | unsigned int fioff; | |
329 | unsigned int foseg; | |
330 | unsigned int fooff; | |
331 | unsigned int fop; | |
332 | int fpreg; | |
333 | int top; | |
334 | ||
335 | fctrl = read_register (FCTRL_REGNUM); | |
336 | fstat = read_register (FSTAT_REGNUM); | |
337 | ftag = read_register (FTAG_REGNUM); | |
338 | fiseg = read_register (FCS_REGNUM); | |
339 | fioff = read_register (FCOFF_REGNUM); | |
340 | foseg = read_register (FDS_REGNUM); | |
341 | fooff = read_register (FDOFF_REGNUM); | |
342 | fop = read_register (FOP_REGNUM); | |
343 | ||
344 | top = ((fstat >> 11) & 7); | |
345 | ||
346 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
347 | { | |
348 | unsigned char raw[FPU_REG_RAW_SIZE]; | |
349 | int tag = (ftag >> (fpreg * 2)) & 3; | |
350 | int i; | |
351 | ||
61113f8b | 352 | fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg); |
de57eccd JM |
353 | |
354 | switch (tag) | |
355 | { | |
356 | case 0: | |
61113f8b | 357 | fputs_filtered ("Valid ", file); |
de57eccd JM |
358 | break; |
359 | case 1: | |
61113f8b | 360 | fputs_filtered ("Zero ", file); |
de57eccd JM |
361 | break; |
362 | case 2: | |
61113f8b | 363 | fputs_filtered ("Special ", file); |
de57eccd JM |
364 | break; |
365 | case 3: | |
61113f8b | 366 | fputs_filtered ("Empty ", file); |
de57eccd JM |
367 | break; |
368 | } | |
369 | ||
370 | read_register_gen ((fpreg + 8 - top) % 8 + FP0_REGNUM, raw); | |
371 | ||
61113f8b | 372 | fputs_filtered ("0x", file); |
de57eccd | 373 | for (i = 9; i >= 0; i--) |
61113f8b | 374 | fprintf_filtered (file, "%02x", raw[i]); |
de57eccd JM |
375 | |
376 | if (tag != 3) | |
61113f8b | 377 | print_i387_ext (raw, file); |
de57eccd | 378 | |
61113f8b | 379 | fputs_filtered ("\n", file); |
de57eccd JM |
380 | } |
381 | ||
382 | puts_filtered ("\n"); | |
383 | ||
61113f8b MK |
384 | print_i387_status_word (fstat, file); |
385 | print_i387_control_word (fctrl, file); | |
386 | fprintf_filtered (file, "Tag Word: %s\n", | |
387 | local_hex_string_custom (ftag, "04")); | |
388 | fprintf_filtered (file, "Instruction Pointer: %s:", | |
389 | local_hex_string_custom (fiseg, "02")); | |
390 | fprintf_filtered (file, "%s\n", local_hex_string_custom (fioff, "08")); | |
391 | fprintf_filtered (file, "Operand Pointer: %s:", | |
392 | local_hex_string_custom (foseg, "02")); | |
393 | fprintf_filtered (file, "%s\n", local_hex_string_custom (fooff, "08")); | |
394 | fprintf_filtered (file, "Opcode: %s\n", | |
395 | local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); | |
de57eccd | 396 | } |
e750d25e JT |
397 | |
398 | /* FIXME: kettenis/2000-05-21: Right now more than a few i386 targets | |
399 | define their own routines to manage the floating-point registers in | |
400 | GDB's register array. Most (if not all) of these targets use the | |
401 | format used by the "fsave" instruction in their communication with | |
402 | the OS. They should all be converted to use the routines below. */ | |
403 | ||
404 | /* At fsave_offset[REGNUM] you'll find the offset to the location in | |
405 | the data structure used by the "fsave" instruction where GDB | |
406 | register REGNUM is stored. */ | |
407 | ||
408 | static int fsave_offset[] = | |
409 | { | |
410 | 28 + 0 * FPU_REG_RAW_SIZE, /* FP0_REGNUM through ... */ | |
411 | 28 + 1 * FPU_REG_RAW_SIZE, | |
412 | 28 + 2 * FPU_REG_RAW_SIZE, | |
413 | 28 + 3 * FPU_REG_RAW_SIZE, | |
414 | 28 + 4 * FPU_REG_RAW_SIZE, | |
415 | 28 + 5 * FPU_REG_RAW_SIZE, | |
416 | 28 + 6 * FPU_REG_RAW_SIZE, | |
417 | 28 + 7 * FPU_REG_RAW_SIZE, /* ... FP7_REGNUM. */ | |
418 | 0, /* FCTRL_REGNUM (16 bits). */ | |
419 | 4, /* FSTAT_REGNUM (16 bits). */ | |
420 | 8, /* FTAG_REGNUM (16 bits). */ | |
421 | 16, /* FISEG_REGNUM (16 bits). */ | |
422 | 12, /* FIOFF_REGNUM. */ | |
423 | 24, /* FOSEG_REGNUM. */ | |
424 | 20, /* FOOFF_REGNUM. */ | |
425 | 18 /* FOP_REGNUM (bottom 11 bits). */ | |
426 | }; | |
427 | ||
428 | #define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_REGNUM]) | |
429 | \f | |
430 | ||
431 | /* Fill register REGNUM in GDB's register array with the appropriate | |
432 | value from *FSAVE. This function masks off any of the reserved | |
433 | bits in *FSAVE. */ | |
434 | ||
435 | void | |
436 | i387_supply_register (int regnum, char *fsave) | |
437 | { | |
438 | /* Most of the FPU control registers occupy only 16 bits in | |
439 | the fsave area. Give those a special treatment. */ | |
440 | if (regnum >= FPC_REGNUM | |
441 | && regnum != FIOFF_REGNUM && regnum != FOOFF_REGNUM) | |
442 | { | |
443 | unsigned char val[4]; | |
444 | ||
445 | memcpy (val, FSAVE_ADDR (fsave, regnum), 2); | |
446 | val[2] = val[3] = 0; | |
447 | if (regnum == FOP_REGNUM) | |
448 | val[1] &= ((1 << 3) - 1); | |
449 | supply_register (regnum, val); | |
450 | } | |
451 | else | |
452 | supply_register (regnum, FSAVE_ADDR (fsave, regnum)); | |
453 | } | |
454 | ||
455 | /* Fill GDB's register array with the floating-point register values | |
456 | in *FSAVE. This function masks off any of the reserved | |
457 | bits in *FSAVE. */ | |
458 | ||
459 | void | |
460 | i387_supply_fsave (char *fsave) | |
461 | { | |
462 | int i; | |
463 | ||
464 | for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) | |
465 | i387_supply_register (i, fsave); | |
466 | } | |
467 | ||
468 | /* Fill register REGNUM (if it is a floating-point register) in *FSAVE | |
469 | with the value in GDB's register array. If REGNUM is -1, do this | |
470 | for all registers. This function doesn't touch any of the reserved | |
471 | bits in *FSAVE. */ | |
472 | ||
473 | void | |
474 | i387_fill_fsave (char *fsave, int regnum) | |
475 | { | |
476 | int i; | |
477 | ||
478 | for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) | |
479 | if (regnum == -1 || regnum == i) | |
480 | { | |
481 | /* Most of the FPU control registers occupy only 16 bits in | |
482 | the fsave area. Give those a special treatment. */ | |
483 | if (i >= FPC_REGNUM | |
484 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) | |
485 | { | |
486 | unsigned char buf[4]; | |
487 | ||
488 | regcache_collect (i, buf); | |
489 | ||
490 | if (i == FOP_REGNUM) | |
491 | { | |
492 | /* The opcode occupies only 11 bits. Make sure we | |
493 | don't touch the other bits. */ | |
494 | buf[1] &= ((1 << 3) - 1); | |
495 | buf[1] |= ((FSAVE_ADDR (fsave, i))[1] & ~((1 << 3) - 1)); | |
496 | } | |
497 | memcpy (FSAVE_ADDR (fsave, i), buf, 2); | |
498 | } | |
499 | else | |
500 | regcache_collect (i, FSAVE_ADDR (fsave, i)); | |
501 | } | |
502 | } | |
503 | \f | |
504 | ||
505 | /* At fxsave_offset[REGNUM] you'll find the offset to the location in | |
506 | the data structure used by the "fxsave" instruction where GDB | |
507 | register REGNUM is stored. */ | |
508 | ||
509 | static int fxsave_offset[] = | |
510 | { | |
511 | 32, /* FP0_REGNUM through ... */ | |
512 | 48, | |
513 | 64, | |
514 | 80, | |
515 | 96, | |
516 | 112, | |
517 | 128, | |
518 | 144, /* ... FP7_REGNUM (80 bits each). */ | |
519 | 0, /* FCTRL_REGNUM (16 bits). */ | |
520 | 2, /* FSTAT_REGNUM (16 bits). */ | |
521 | 4, /* FTAG_REGNUM (16 bits). */ | |
522 | 12, /* FISEG_REGNUM (16 bits). */ | |
523 | 8, /* FIOFF_REGNUM. */ | |
524 | 20, /* FOSEG_REGNUM (16 bits). */ | |
525 | 16, /* FOOFF_REGNUM. */ | |
526 | 6, /* FOP_REGNUM (bottom 11 bits). */ | |
527 | 160, /* XMM0_REGNUM through ... */ | |
528 | 176, | |
529 | 192, | |
530 | 208, | |
531 | 224, | |
532 | 240, | |
533 | 256, | |
534 | 272, /* ... XMM7_REGNUM (128 bits each). */ | |
535 | 24, /* MXCSR_REGNUM. */ | |
536 | }; | |
537 | ||
538 | #define FXSAVE_ADDR(fxsave, regnum) \ | |
539 | (fxsave + fxsave_offset[regnum - FP0_REGNUM]) | |
540 | ||
541 | static int i387_tag (unsigned char *raw); | |
542 | \f | |
543 | ||
544 | /* Fill GDB's register array with the floating-point and SSE register | |
545 | values in *FXSAVE. This function masks off any of the reserved | |
546 | bits in *FXSAVE. */ | |
547 | ||
548 | void | |
549 | i387_supply_fxsave (char *fxsave) | |
550 | { | |
dff95cc7 MK |
551 | int i, last_regnum = MXCSR_REGNUM; |
552 | ||
553 | if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) | |
554 | last_regnum = FOP_REGNUM; | |
e750d25e | 555 | |
dff95cc7 | 556 | for (i = FP0_REGNUM; i <= last_regnum; i++) |
e750d25e JT |
557 | { |
558 | /* Most of the FPU control registers occupy only 16 bits in | |
559 | the fxsave area. Give those a special treatment. */ | |
560 | if (i >= FPC_REGNUM && i < XMM0_REGNUM | |
561 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) | |
562 | { | |
563 | unsigned char val[4]; | |
564 | ||
565 | memcpy (val, FXSAVE_ADDR (fxsave, i), 2); | |
566 | val[2] = val[3] = 0; | |
567 | if (i == FOP_REGNUM) | |
568 | val[1] &= ((1 << 3) - 1); | |
569 | else if (i== FTAG_REGNUM) | |
570 | { | |
571 | /* The fxsave area contains a simplified version of the | |
572 | tag word. We have to look at the actual 80-bit FP | |
573 | data to recreate the traditional i387 tag word. */ | |
574 | ||
575 | unsigned long ftag = 0; | |
576 | int fpreg; | |
577 | int top; | |
578 | ||
579 | top = (((FXSAVE_ADDR (fxsave, FSTAT_REGNUM))[1] >> 3) & 0x7); | |
580 | ||
581 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
582 | { | |
583 | int tag; | |
584 | ||
585 | if (val[0] & (1 << fpreg)) | |
586 | { | |
587 | int regnum = (fpreg + 8 - top) % 8 + FP0_REGNUM; | |
588 | tag = i387_tag (FXSAVE_ADDR (fxsave, regnum)); | |
589 | } | |
590 | else | |
591 | tag = 3; /* Empty */ | |
592 | ||
593 | ftag |= tag << (2 * fpreg); | |
594 | } | |
595 | val[0] = ftag & 0xff; | |
596 | val[1] = (ftag >> 8) & 0xff; | |
597 | } | |
598 | supply_register (i, val); | |
599 | } | |
600 | else | |
601 | supply_register (i, FXSAVE_ADDR (fxsave, i)); | |
602 | } | |
603 | } | |
604 | ||
605 | /* Fill register REGNUM (if it is a floating-point or SSE register) in | |
606 | *FXSAVE with the value in GDB's register array. If REGNUM is -1, do | |
607 | this for all registers. This function doesn't touch any of the | |
608 | reserved bits in *FXSAVE. */ | |
609 | ||
610 | void | |
611 | i387_fill_fxsave (char *fxsave, int regnum) | |
612 | { | |
dff95cc7 MK |
613 | int i, last_regnum = MXCSR_REGNUM; |
614 | ||
615 | if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) | |
616 | last_regnum = FOP_REGNUM; | |
e750d25e | 617 | |
dff95cc7 | 618 | for (i = FP0_REGNUM; i <= last_regnum; i++) |
e750d25e JT |
619 | if (regnum == -1 || regnum == i) |
620 | { | |
621 | /* Most of the FPU control registers occupy only 16 bits in | |
622 | the fxsave area. Give those a special treatment. */ | |
623 | if (i >= FPC_REGNUM && i < XMM0_REGNUM | |
624 | && i != FIOFF_REGNUM && i != FDOFF_REGNUM) | |
625 | { | |
626 | unsigned char buf[4]; | |
627 | ||
628 | regcache_collect (i, buf); | |
629 | ||
630 | if (i == FOP_REGNUM) | |
631 | { | |
632 | /* The opcode occupies only 11 bits. Make sure we | |
633 | don't touch the other bits. */ | |
634 | buf[1] &= ((1 << 3) - 1); | |
635 | buf[1] |= ((FXSAVE_ADDR (fxsave, i))[1] & ~((1 << 3) - 1)); | |
636 | } | |
637 | else if (i == FTAG_REGNUM) | |
638 | { | |
639 | /* Converting back is much easier. */ | |
640 | ||
641 | unsigned short ftag; | |
642 | int fpreg; | |
643 | ||
644 | ftag = (buf[1] << 8) | buf[0]; | |
645 | buf[0] = 0; | |
646 | buf[1] = 0; | |
647 | ||
648 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
649 | { | |
650 | int tag = (ftag >> (fpreg * 2)) & 3; | |
651 | ||
652 | if (tag != 3) | |
653 | buf[0] |= (1 << fpreg); | |
654 | } | |
655 | } | |
656 | memcpy (FXSAVE_ADDR (fxsave, i), buf, 2); | |
657 | } | |
658 | else | |
659 | regcache_collect (i, FXSAVE_ADDR (fxsave, i)); | |
660 | } | |
661 | } | |
662 | ||
663 | /* Recreate the FTW (tag word) valid bits from the 80-bit FP data in | |
664 | *RAW. */ | |
665 | ||
666 | static int | |
667 | i387_tag (unsigned char *raw) | |
668 | { | |
669 | int integer; | |
670 | unsigned int exponent; | |
671 | unsigned long fraction[2]; | |
672 | ||
673 | integer = raw[7] & 0x80; | |
674 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
675 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
676 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
677 | | (raw[5] << 8) | raw[4]); | |
678 | ||
679 | if (exponent == 0x7fff) | |
680 | { | |
681 | /* Special. */ | |
682 | return (2); | |
683 | } | |
684 | else if (exponent == 0x0000) | |
685 | { | |
686 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
687 | { | |
688 | /* Zero. */ | |
689 | return (1); | |
690 | } | |
691 | else | |
692 | { | |
693 | /* Special. */ | |
694 | return (2); | |
695 | } | |
696 | } | |
697 | else | |
698 | { | |
699 | if (integer) | |
700 | { | |
701 | /* Valid. */ | |
702 | return (0); | |
703 | } | |
704 | else | |
705 | { | |
706 | /* Special. */ | |
707 | return (2); | |
708 | } | |
709 | } | |
710 | } |