Commit | Line | Data |
---|---|---|
c906108c | 1 | /* Intel 387 floating point stuff. |
38edeab8 | 2 | |
dff95cc7 | 3 | Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1998, 1999, 2000, |
38edeab8 | 4 | 2001, 2002, 2003 Free Software Foundation, Inc. |
c906108c | 5 | |
c5aa993b | 6 | This file is part of GDB. |
c906108c | 7 | |
c5aa993b JM |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
c906108c | 12 | |
c5aa993b JM |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
c906108c | 17 | |
c5aa993b JM |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, | |
21 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
22 | |
23 | #include "defs.h" | |
24 | #include "frame.h" | |
25 | #include "inferior.h" | |
26 | #include "language.h" | |
d4f3574e | 27 | #include "value.h" |
c906108c SS |
28 | #include "gdbcore.h" |
29 | #include "floatformat.h" | |
4e052eda | 30 | #include "regcache.h" |
d0df8472 | 31 | #include "gdb_assert.h" |
309367d4 | 32 | #include "gdb_string.h" |
d16aafd8 | 33 | #include "doublest.h" |
c906108c | 34 | |
9a82579f | 35 | #include "i386-tdep.h" |
42c466d7 | 36 | #include "i387-tdep.h" |
c906108c | 37 | |
de57eccd JM |
38 | /* Implement the `info float' layout based on the register definitions |
39 | in `tm-i386.h'. */ | |
40 | ||
41 | /* Print the floating point number specified by RAW. */ | |
42 | static void | |
61113f8b | 43 | print_i387_value (char *raw, struct ui_file *file) |
de57eccd JM |
44 | { |
45 | DOUBLEST value; | |
4583280c MK |
46 | |
47 | /* Using extract_typed_floating here might affect the representation | |
48 | of certain numbers such as NaNs, even if GDB is running natively. | |
49 | This is fine since our caller already detects such special | |
50 | numbers and we print the hexadecimal representation anyway. */ | |
51 | value = extract_typed_floating (raw, builtin_type_i387_ext); | |
de57eccd JM |
52 | |
53 | /* We try to print 19 digits. The last digit may or may not contain | |
54 | garbage, but we'd better print one too many. We need enough room | |
55 | to print the value, 1 position for the sign, 1 for the decimal | |
56 | point, 19 for the digits and 6 for the exponent adds up to 27. */ | |
57 | #ifdef PRINTF_HAS_LONG_DOUBLE | |
61113f8b | 58 | fprintf_filtered (file, " %-+27.19Lg", (long double) value); |
de57eccd | 59 | #else |
61113f8b | 60 | fprintf_filtered (file, " %-+27.19g", (double) value); |
de57eccd JM |
61 | #endif |
62 | } | |
63 | ||
64 | /* Print the classification for the register contents RAW. */ | |
65 | static void | |
61113f8b | 66 | print_i387_ext (unsigned char *raw, struct ui_file *file) |
de57eccd JM |
67 | { |
68 | int sign; | |
69 | int integer; | |
70 | unsigned int exponent; | |
71 | unsigned long fraction[2]; | |
72 | ||
73 | sign = raw[9] & 0x80; | |
74 | integer = raw[7] & 0x80; | |
75 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
76 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
77 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
78 | | (raw[5] << 8) | raw[4]); | |
79 | ||
80 | if (exponent == 0x7fff && integer) | |
81 | { | |
82 | if (fraction[0] == 0x00000000 && fraction[1] == 0x00000000) | |
83 | /* Infinity. */ | |
61113f8b | 84 | fprintf_filtered (file, " %cInf", (sign ? '-' : '+')); |
de57eccd JM |
85 | else if (sign && fraction[0] == 0x00000000 && fraction[1] == 0x40000000) |
86 | /* Real Indefinite (QNaN). */ | |
61113f8b | 87 | fputs_unfiltered (" Real Indefinite (QNaN)", file); |
de57eccd JM |
88 | else if (fraction[1] & 0x40000000) |
89 | /* QNaN. */ | |
61113f8b | 90 | fputs_filtered (" QNaN", file); |
de57eccd JM |
91 | else |
92 | /* SNaN. */ | |
61113f8b | 93 | fputs_filtered (" SNaN", file); |
de57eccd JM |
94 | } |
95 | else if (exponent < 0x7fff && exponent > 0x0000 && integer) | |
96 | /* Normal. */ | |
61113f8b | 97 | print_i387_value (raw, file); |
de57eccd JM |
98 | else if (exponent == 0x0000) |
99 | { | |
100 | /* Denormal or zero. */ | |
61113f8b | 101 | print_i387_value (raw, file); |
de57eccd JM |
102 | |
103 | if (integer) | |
104 | /* Pseudo-denormal. */ | |
61113f8b | 105 | fputs_filtered (" Pseudo-denormal", file); |
de57eccd JM |
106 | else if (fraction[0] || fraction[1]) |
107 | /* Denormal. */ | |
61113f8b | 108 | fputs_filtered (" Denormal", file); |
de57eccd JM |
109 | } |
110 | else | |
111 | /* Unsupported. */ | |
61113f8b | 112 | fputs_filtered (" Unsupported", file); |
de57eccd JM |
113 | } |
114 | ||
115 | /* Print the status word STATUS. */ | |
116 | static void | |
61113f8b | 117 | print_i387_status_word (unsigned int status, struct ui_file *file) |
de57eccd | 118 | { |
61113f8b | 119 | fprintf_filtered (file, "Status Word: %s", |
de57eccd | 120 | local_hex_string_custom (status, "04")); |
61113f8b MK |
121 | fputs_filtered (" ", file); |
122 | fprintf_filtered (file, " %s", (status & 0x0001) ? "IE" : " "); | |
123 | fprintf_filtered (file, " %s", (status & 0x0002) ? "DE" : " "); | |
124 | fprintf_filtered (file, " %s", (status & 0x0004) ? "ZE" : " "); | |
125 | fprintf_filtered (file, " %s", (status & 0x0008) ? "OE" : " "); | |
126 | fprintf_filtered (file, " %s", (status & 0x0010) ? "UE" : " "); | |
127 | fprintf_filtered (file, " %s", (status & 0x0020) ? "PE" : " "); | |
128 | fputs_filtered (" ", file); | |
129 | fprintf_filtered (file, " %s", (status & 0x0080) ? "ES" : " "); | |
130 | fputs_filtered (" ", file); | |
131 | fprintf_filtered (file, " %s", (status & 0x0040) ? "SF" : " "); | |
132 | fputs_filtered (" ", file); | |
133 | fprintf_filtered (file, " %s", (status & 0x0100) ? "C0" : " "); | |
134 | fprintf_filtered (file, " %s", (status & 0x0200) ? "C1" : " "); | |
135 | fprintf_filtered (file, " %s", (status & 0x0400) ? "C2" : " "); | |
136 | fprintf_filtered (file, " %s", (status & 0x4000) ? "C3" : " "); | |
137 | ||
138 | fputs_filtered ("\n", file); | |
139 | ||
140 | fprintf_filtered (file, | |
141 | " TOP: %d\n", ((status >> 11) & 7)); | |
de57eccd JM |
142 | } |
143 | ||
144 | /* Print the control word CONTROL. */ | |
145 | static void | |
61113f8b | 146 | print_i387_control_word (unsigned int control, struct ui_file *file) |
de57eccd | 147 | { |
61113f8b | 148 | fprintf_filtered (file, "Control Word: %s", |
de57eccd | 149 | local_hex_string_custom (control, "04")); |
61113f8b MK |
150 | fputs_filtered (" ", file); |
151 | fprintf_filtered (file, " %s", (control & 0x0001) ? "IM" : " "); | |
152 | fprintf_filtered (file, " %s", (control & 0x0002) ? "DM" : " "); | |
153 | fprintf_filtered (file, " %s", (control & 0x0004) ? "ZM" : " "); | |
154 | fprintf_filtered (file, " %s", (control & 0x0008) ? "OM" : " "); | |
155 | fprintf_filtered (file, " %s", (control & 0x0010) ? "UM" : " "); | |
156 | fprintf_filtered (file, " %s", (control & 0x0020) ? "PM" : " "); | |
de57eccd | 157 | |
61113f8b | 158 | fputs_filtered ("\n", file); |
de57eccd | 159 | |
61113f8b | 160 | fputs_filtered (" PC: ", file); |
de57eccd JM |
161 | switch ((control >> 8) & 3) |
162 | { | |
163 | case 0: | |
61113f8b | 164 | fputs_filtered ("Single Precision (24-bits)\n", file); |
de57eccd JM |
165 | break; |
166 | case 1: | |
61113f8b | 167 | fputs_filtered ("Reserved\n", file); |
de57eccd JM |
168 | break; |
169 | case 2: | |
61113f8b | 170 | fputs_filtered ("Double Precision (53-bits)\n", file); |
de57eccd JM |
171 | break; |
172 | case 3: | |
61113f8b | 173 | fputs_filtered ("Extended Precision (64-bits)\n", file); |
de57eccd JM |
174 | break; |
175 | } | |
176 | ||
61113f8b | 177 | fputs_filtered (" RC: ", file); |
de57eccd JM |
178 | switch ((control >> 10) & 3) |
179 | { | |
180 | case 0: | |
61113f8b | 181 | fputs_filtered ("Round to nearest\n", file); |
de57eccd JM |
182 | break; |
183 | case 1: | |
61113f8b | 184 | fputs_filtered ("Round down\n", file); |
de57eccd JM |
185 | break; |
186 | case 2: | |
61113f8b | 187 | fputs_filtered ("Round up\n", file); |
de57eccd JM |
188 | break; |
189 | case 3: | |
61113f8b | 190 | fputs_filtered ("Round toward zero\n", file); |
de57eccd JM |
191 | break; |
192 | } | |
193 | } | |
194 | ||
9b949a49 | 195 | /* Print out the i387 floating point state. Note that we ignore FRAME |
7d8d2918 MK |
196 | in the code below. That's OK since floating-point registers are |
197 | never saved on the stack. */ | |
198 | ||
de57eccd | 199 | void |
61113f8b | 200 | i387_print_float_info (struct gdbarch *gdbarch, struct ui_file *file, |
8e186fd6 | 201 | struct frame_info *frame, const char *args) |
de57eccd | 202 | { |
1d70089a MK |
203 | char buf[4]; |
204 | ULONGEST fctrl; | |
205 | ULONGEST fstat; | |
206 | ULONGEST ftag; | |
207 | ULONGEST fiseg; | |
208 | ULONGEST fioff; | |
209 | ULONGEST foseg; | |
210 | ULONGEST fooff; | |
211 | ULONGEST fop; | |
de57eccd JM |
212 | int fpreg; |
213 | int top; | |
214 | ||
1d70089a MK |
215 | frame_register_read (frame, FCTRL_REGNUM, buf); |
216 | fctrl = extract_unsigned_integer (buf, 4); | |
217 | frame_register_read (frame, FSTAT_REGNUM, buf); | |
218 | fstat = extract_unsigned_integer (buf, 4); | |
219 | frame_register_read (frame, FTAG_REGNUM, buf); | |
220 | ftag = extract_unsigned_integer (buf, 4); | |
221 | frame_register_read (frame, FISEG_REGNUM, buf); | |
222 | fiseg = extract_unsigned_integer (buf, 4); | |
223 | frame_register_read (frame, FIOFF_REGNUM, buf); | |
224 | fioff = extract_unsigned_integer (buf, 4); | |
225 | frame_register_read (frame, FOSEG_REGNUM, buf); | |
226 | foseg = extract_unsigned_integer (buf, 4); | |
227 | frame_register_read (frame, FOOFF_REGNUM, buf); | |
228 | fooff = extract_unsigned_integer (buf, 4); | |
229 | frame_register_read (frame, FOP_REGNUM, buf); | |
230 | fop = extract_unsigned_integer (buf, 4); | |
231 | ||
de57eccd JM |
232 | top = ((fstat >> 11) & 7); |
233 | ||
234 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
235 | { | |
236 | unsigned char raw[FPU_REG_RAW_SIZE]; | |
237 | int tag = (ftag >> (fpreg * 2)) & 3; | |
238 | int i; | |
239 | ||
61113f8b | 240 | fprintf_filtered (file, "%sR%d: ", fpreg == top ? "=>" : " ", fpreg); |
de57eccd JM |
241 | |
242 | switch (tag) | |
243 | { | |
244 | case 0: | |
61113f8b | 245 | fputs_filtered ("Valid ", file); |
de57eccd JM |
246 | break; |
247 | case 1: | |
61113f8b | 248 | fputs_filtered ("Zero ", file); |
de57eccd JM |
249 | break; |
250 | case 2: | |
61113f8b | 251 | fputs_filtered ("Special ", file); |
de57eccd JM |
252 | break; |
253 | case 3: | |
61113f8b | 254 | fputs_filtered ("Empty ", file); |
de57eccd JM |
255 | break; |
256 | } | |
257 | ||
1d70089a | 258 | frame_register_read (frame, (fpreg + 8 - top) % 8 + FP0_REGNUM, raw); |
de57eccd | 259 | |
61113f8b | 260 | fputs_filtered ("0x", file); |
de57eccd | 261 | for (i = 9; i >= 0; i--) |
61113f8b | 262 | fprintf_filtered (file, "%02x", raw[i]); |
de57eccd JM |
263 | |
264 | if (tag != 3) | |
61113f8b | 265 | print_i387_ext (raw, file); |
de57eccd | 266 | |
61113f8b | 267 | fputs_filtered ("\n", file); |
de57eccd JM |
268 | } |
269 | ||
f16a25ae | 270 | fputs_filtered ("\n", file); |
de57eccd | 271 | |
61113f8b MK |
272 | print_i387_status_word (fstat, file); |
273 | print_i387_control_word (fctrl, file); | |
274 | fprintf_filtered (file, "Tag Word: %s\n", | |
275 | local_hex_string_custom (ftag, "04")); | |
276 | fprintf_filtered (file, "Instruction Pointer: %s:", | |
277 | local_hex_string_custom (fiseg, "02")); | |
278 | fprintf_filtered (file, "%s\n", local_hex_string_custom (fioff, "08")); | |
279 | fprintf_filtered (file, "Operand Pointer: %s:", | |
280 | local_hex_string_custom (foseg, "02")); | |
281 | fprintf_filtered (file, "%s\n", local_hex_string_custom (fooff, "08")); | |
282 | fprintf_filtered (file, "Opcode: %s\n", | |
283 | local_hex_string_custom (fop ? (fop | 0xd800) : 0, "04")); | |
de57eccd | 284 | } |
d532c08f MK |
285 | \f |
286 | ||
287 | /* Read a value of type TYPE from register REGNUM in frame FRAME, and | |
288 | return its contents in TO. */ | |
289 | ||
290 | void | |
291 | i387_register_to_value (struct frame_info *frame, int regnum, | |
292 | struct type *type, void *to) | |
293 | { | |
294 | char from[I386_MAX_REGISTER_SIZE]; | |
295 | ||
296 | gdb_assert (i386_fp_regnum_p (regnum)); | |
297 | ||
298 | /* We only support floating-point values. */ | |
299 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
300 | { | |
301 | warning ("Cannot convert floating-point register value " | |
302 | "to non-floating-point type."); | |
303 | return; | |
304 | } | |
305 | ||
306 | /* Convert to TYPE. This should be a no-op if TYPE is equivalent to | |
307 | the extended floating-point format used by the FPU. */ | |
308 | frame_read_register (frame, regnum, from); | |
309 | convert_typed_floating (from, builtin_type_i387_ext, to, type); | |
310 | } | |
311 | ||
312 | /* Write the contents FROM of a value of type TYPE into register | |
313 | REGNUM in frame FRAME. */ | |
314 | ||
315 | void | |
316 | i387_value_to_register (struct frame_info *frame, int regnum, | |
317 | struct type *type, const void *from) | |
318 | { | |
319 | char to[I386_MAX_REGISTER_SIZE]; | |
320 | ||
321 | gdb_assert (i386_fp_regnum_p (regnum)); | |
322 | ||
323 | /* We only support floating-point values. */ | |
324 | if (TYPE_CODE (type) != TYPE_CODE_FLT) | |
325 | { | |
326 | warning ("Cannot convert non-floating-point type " | |
327 | "to floating-point register value."); | |
328 | return; | |
329 | } | |
330 | ||
331 | /* Convert from TYPE. This should be a no-op if TYPE is equivalent | |
332 | to the extended floating-point format used by the FPU. */ | |
333 | convert_typed_floating (from, type, to, builtin_type_i387_ext); | |
334 | put_frame_register (frame, regnum, to); | |
335 | } | |
336 | \f | |
e750d25e JT |
337 | |
338 | /* FIXME: kettenis/2000-05-21: Right now more than a few i386 targets | |
339 | define their own routines to manage the floating-point registers in | |
340 | GDB's register array. Most (if not all) of these targets use the | |
341 | format used by the "fsave" instruction in their communication with | |
342 | the OS. They should all be converted to use the routines below. */ | |
343 | ||
344 | /* At fsave_offset[REGNUM] you'll find the offset to the location in | |
345 | the data structure used by the "fsave" instruction where GDB | |
346 | register REGNUM is stored. */ | |
347 | ||
348 | static int fsave_offset[] = | |
349 | { | |
350 | 28 + 0 * FPU_REG_RAW_SIZE, /* FP0_REGNUM through ... */ | |
351 | 28 + 1 * FPU_REG_RAW_SIZE, | |
352 | 28 + 2 * FPU_REG_RAW_SIZE, | |
353 | 28 + 3 * FPU_REG_RAW_SIZE, | |
354 | 28 + 4 * FPU_REG_RAW_SIZE, | |
355 | 28 + 5 * FPU_REG_RAW_SIZE, | |
356 | 28 + 6 * FPU_REG_RAW_SIZE, | |
357 | 28 + 7 * FPU_REG_RAW_SIZE, /* ... FP7_REGNUM. */ | |
358 | 0, /* FCTRL_REGNUM (16 bits). */ | |
359 | 4, /* FSTAT_REGNUM (16 bits). */ | |
360 | 8, /* FTAG_REGNUM (16 bits). */ | |
361 | 16, /* FISEG_REGNUM (16 bits). */ | |
362 | 12, /* FIOFF_REGNUM. */ | |
363 | 24, /* FOSEG_REGNUM. */ | |
364 | 20, /* FOOFF_REGNUM. */ | |
365 | 18 /* FOP_REGNUM (bottom 11 bits). */ | |
366 | }; | |
367 | ||
368 | #define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_REGNUM]) | |
369 | \f | |
370 | ||
371 | /* Fill register REGNUM in GDB's register array with the appropriate | |
372 | value from *FSAVE. This function masks off any of the reserved | |
373 | bits in *FSAVE. */ | |
374 | ||
375 | void | |
376 | i387_supply_register (int regnum, char *fsave) | |
377 | { | |
932bb524 KD |
378 | if (fsave == NULL) |
379 | { | |
380 | supply_register (regnum, NULL); | |
381 | return; | |
382 | } | |
383 | ||
e750d25e JT |
384 | /* Most of the FPU control registers occupy only 16 bits in |
385 | the fsave area. Give those a special treatment. */ | |
386 | if (regnum >= FPC_REGNUM | |
387 | && regnum != FIOFF_REGNUM && regnum != FOOFF_REGNUM) | |
388 | { | |
389 | unsigned char val[4]; | |
390 | ||
391 | memcpy (val, FSAVE_ADDR (fsave, regnum), 2); | |
392 | val[2] = val[3] = 0; | |
393 | if (regnum == FOP_REGNUM) | |
394 | val[1] &= ((1 << 3) - 1); | |
395 | supply_register (regnum, val); | |
396 | } | |
397 | else | |
398 | supply_register (regnum, FSAVE_ADDR (fsave, regnum)); | |
399 | } | |
400 | ||
401 | /* Fill GDB's register array with the floating-point register values | |
402 | in *FSAVE. This function masks off any of the reserved | |
403 | bits in *FSAVE. */ | |
404 | ||
405 | void | |
406 | i387_supply_fsave (char *fsave) | |
407 | { | |
408 | int i; | |
409 | ||
410 | for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) | |
411 | i387_supply_register (i, fsave); | |
412 | } | |
413 | ||
414 | /* Fill register REGNUM (if it is a floating-point register) in *FSAVE | |
415 | with the value in GDB's register array. If REGNUM is -1, do this | |
416 | for all registers. This function doesn't touch any of the reserved | |
417 | bits in *FSAVE. */ | |
418 | ||
419 | void | |
420 | i387_fill_fsave (char *fsave, int regnum) | |
421 | { | |
422 | int i; | |
423 | ||
424 | for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) | |
425 | if (regnum == -1 || regnum == i) | |
426 | { | |
427 | /* Most of the FPU control registers occupy only 16 bits in | |
428 | the fsave area. Give those a special treatment. */ | |
429 | if (i >= FPC_REGNUM | |
430 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) | |
431 | { | |
432 | unsigned char buf[4]; | |
433 | ||
434 | regcache_collect (i, buf); | |
435 | ||
436 | if (i == FOP_REGNUM) | |
437 | { | |
438 | /* The opcode occupies only 11 bits. Make sure we | |
439 | don't touch the other bits. */ | |
440 | buf[1] &= ((1 << 3) - 1); | |
441 | buf[1] |= ((FSAVE_ADDR (fsave, i))[1] & ~((1 << 3) - 1)); | |
442 | } | |
443 | memcpy (FSAVE_ADDR (fsave, i), buf, 2); | |
444 | } | |
445 | else | |
446 | regcache_collect (i, FSAVE_ADDR (fsave, i)); | |
447 | } | |
448 | } | |
449 | \f | |
450 | ||
451 | /* At fxsave_offset[REGNUM] you'll find the offset to the location in | |
452 | the data structure used by the "fxsave" instruction where GDB | |
453 | register REGNUM is stored. */ | |
454 | ||
455 | static int fxsave_offset[] = | |
456 | { | |
457 | 32, /* FP0_REGNUM through ... */ | |
458 | 48, | |
459 | 64, | |
460 | 80, | |
461 | 96, | |
462 | 112, | |
463 | 128, | |
464 | 144, /* ... FP7_REGNUM (80 bits each). */ | |
465 | 0, /* FCTRL_REGNUM (16 bits). */ | |
466 | 2, /* FSTAT_REGNUM (16 bits). */ | |
467 | 4, /* FTAG_REGNUM (16 bits). */ | |
468 | 12, /* FISEG_REGNUM (16 bits). */ | |
469 | 8, /* FIOFF_REGNUM. */ | |
470 | 20, /* FOSEG_REGNUM (16 bits). */ | |
471 | 16, /* FOOFF_REGNUM. */ | |
472 | 6, /* FOP_REGNUM (bottom 11 bits). */ | |
04c8243f MK |
473 | 160 + 0 * 16, /* XMM0_REGNUM through ... */ |
474 | 160 + 1 * 16, | |
475 | 160 + 2 * 16, | |
476 | 160 + 3 * 16, | |
477 | 160 + 4 * 16, | |
478 | 160 + 5 * 16, | |
479 | 160 + 6 * 16, | |
480 | 160 + 7 * 16, | |
481 | 160 + 8 * 16, | |
482 | 160 + 9 * 16, | |
483 | 160 + 10 * 16, | |
484 | 160 + 11 * 16, | |
485 | 160 + 12 * 16, | |
486 | 160 + 13 * 16, | |
487 | 160 + 14 * 16, | |
488 | 160 + 15 * 16, /* ... XMM15_REGNUM (128 bits each). */ | |
489 | 24 /* MXCSR_REGNUM. */ | |
e750d25e JT |
490 | }; |
491 | ||
04c8243f MK |
492 | /* FIXME: kettenis/20030430: We made an unfortunate choice in putting |
493 | %mxcsr after the SSE registers %xmm0-%xmm7 instead of before, since | |
494 | it makes supporting the registers %xmm8-%xmm15 on x86-64 a bit | |
495 | involved. Hack around it by explicitly overriding the offset for | |
496 | %mxcsr here. */ | |
497 | ||
e750d25e | 498 | #define FXSAVE_ADDR(fxsave, regnum) \ |
04c8243f MK |
499 | ((regnum == MXCSR_REGNUM) ? (fxsave + 24) : \ |
500 | (fxsave + fxsave_offset[regnum - FP0_REGNUM])) | |
e750d25e JT |
501 | |
502 | static int i387_tag (unsigned char *raw); | |
503 | \f | |
504 | ||
505 | /* Fill GDB's register array with the floating-point and SSE register | |
506 | values in *FXSAVE. This function masks off any of the reserved | |
507 | bits in *FXSAVE. */ | |
508 | ||
509 | void | |
510 | i387_supply_fxsave (char *fxsave) | |
511 | { | |
dff95cc7 MK |
512 | int i, last_regnum = MXCSR_REGNUM; |
513 | ||
514 | if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) | |
515 | last_regnum = FOP_REGNUM; | |
e750d25e | 516 | |
dff95cc7 | 517 | for (i = FP0_REGNUM; i <= last_regnum; i++) |
e750d25e | 518 | { |
932bb524 KD |
519 | if (fxsave == NULL) |
520 | { | |
521 | supply_register (i, NULL); | |
522 | continue; | |
523 | } | |
524 | ||
e750d25e JT |
525 | /* Most of the FPU control registers occupy only 16 bits in |
526 | the fxsave area. Give those a special treatment. */ | |
527 | if (i >= FPC_REGNUM && i < XMM0_REGNUM | |
528 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) | |
529 | { | |
530 | unsigned char val[4]; | |
531 | ||
532 | memcpy (val, FXSAVE_ADDR (fxsave, i), 2); | |
533 | val[2] = val[3] = 0; | |
534 | if (i == FOP_REGNUM) | |
535 | val[1] &= ((1 << 3) - 1); | |
536 | else if (i== FTAG_REGNUM) | |
537 | { | |
538 | /* The fxsave area contains a simplified version of the | |
539 | tag word. We have to look at the actual 80-bit FP | |
540 | data to recreate the traditional i387 tag word. */ | |
541 | ||
542 | unsigned long ftag = 0; | |
543 | int fpreg; | |
544 | int top; | |
545 | ||
546 | top = (((FXSAVE_ADDR (fxsave, FSTAT_REGNUM))[1] >> 3) & 0x7); | |
547 | ||
548 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
549 | { | |
550 | int tag; | |
551 | ||
552 | if (val[0] & (1 << fpreg)) | |
553 | { | |
554 | int regnum = (fpreg + 8 - top) % 8 + FP0_REGNUM; | |
555 | tag = i387_tag (FXSAVE_ADDR (fxsave, regnum)); | |
556 | } | |
557 | else | |
558 | tag = 3; /* Empty */ | |
559 | ||
560 | ftag |= tag << (2 * fpreg); | |
561 | } | |
562 | val[0] = ftag & 0xff; | |
563 | val[1] = (ftag >> 8) & 0xff; | |
564 | } | |
565 | supply_register (i, val); | |
566 | } | |
567 | else | |
568 | supply_register (i, FXSAVE_ADDR (fxsave, i)); | |
569 | } | |
570 | } | |
571 | ||
572 | /* Fill register REGNUM (if it is a floating-point or SSE register) in | |
573 | *FXSAVE with the value in GDB's register array. If REGNUM is -1, do | |
574 | this for all registers. This function doesn't touch any of the | |
575 | reserved bits in *FXSAVE. */ | |
576 | ||
577 | void | |
578 | i387_fill_fxsave (char *fxsave, int regnum) | |
579 | { | |
dff95cc7 MK |
580 | int i, last_regnum = MXCSR_REGNUM; |
581 | ||
582 | if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) | |
583 | last_regnum = FOP_REGNUM; | |
e750d25e | 584 | |
dff95cc7 | 585 | for (i = FP0_REGNUM; i <= last_regnum; i++) |
e750d25e JT |
586 | if (regnum == -1 || regnum == i) |
587 | { | |
588 | /* Most of the FPU control registers occupy only 16 bits in | |
589 | the fxsave area. Give those a special treatment. */ | |
590 | if (i >= FPC_REGNUM && i < XMM0_REGNUM | |
19e33363 | 591 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) |
e750d25e JT |
592 | { |
593 | unsigned char buf[4]; | |
594 | ||
595 | regcache_collect (i, buf); | |
596 | ||
597 | if (i == FOP_REGNUM) | |
598 | { | |
599 | /* The opcode occupies only 11 bits. Make sure we | |
600 | don't touch the other bits. */ | |
601 | buf[1] &= ((1 << 3) - 1); | |
602 | buf[1] |= ((FXSAVE_ADDR (fxsave, i))[1] & ~((1 << 3) - 1)); | |
603 | } | |
604 | else if (i == FTAG_REGNUM) | |
605 | { | |
606 | /* Converting back is much easier. */ | |
607 | ||
608 | unsigned short ftag; | |
609 | int fpreg; | |
610 | ||
611 | ftag = (buf[1] << 8) | buf[0]; | |
612 | buf[0] = 0; | |
613 | buf[1] = 0; | |
614 | ||
615 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
616 | { | |
617 | int tag = (ftag >> (fpreg * 2)) & 3; | |
618 | ||
619 | if (tag != 3) | |
620 | buf[0] |= (1 << fpreg); | |
621 | } | |
622 | } | |
623 | memcpy (FXSAVE_ADDR (fxsave, i), buf, 2); | |
624 | } | |
625 | else | |
626 | regcache_collect (i, FXSAVE_ADDR (fxsave, i)); | |
627 | } | |
628 | } | |
629 | ||
630 | /* Recreate the FTW (tag word) valid bits from the 80-bit FP data in | |
631 | *RAW. */ | |
632 | ||
633 | static int | |
634 | i387_tag (unsigned char *raw) | |
635 | { | |
636 | int integer; | |
637 | unsigned int exponent; | |
638 | unsigned long fraction[2]; | |
639 | ||
640 | integer = raw[7] & 0x80; | |
641 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
642 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
643 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
644 | | (raw[5] << 8) | raw[4]); | |
645 | ||
646 | if (exponent == 0x7fff) | |
647 | { | |
648 | /* Special. */ | |
649 | return (2); | |
650 | } | |
651 | else if (exponent == 0x0000) | |
652 | { | |
653 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
654 | { | |
655 | /* Zero. */ | |
656 | return (1); | |
657 | } | |
658 | else | |
659 | { | |
660 | /* Special. */ | |
661 | return (2); | |
662 | } | |
663 | } | |
664 | else | |
665 | { | |
666 | if (integer) | |
667 | { | |
668 | /* Valid. */ | |
669 | return (0); | |
670 | } | |
671 | else | |
672 | { | |
673 | /* Special. */ | |
674 | return (2); | |
675 | } | |
676 | } | |
677 | } |