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 | } |
e750d25e JT |
285 | |
286 | /* FIXME: kettenis/2000-05-21: Right now more than a few i386 targets | |
287 | define their own routines to manage the floating-point registers in | |
288 | GDB's register array. Most (if not all) of these targets use the | |
289 | format used by the "fsave" instruction in their communication with | |
290 | the OS. They should all be converted to use the routines below. */ | |
291 | ||
292 | /* At fsave_offset[REGNUM] you'll find the offset to the location in | |
293 | the data structure used by the "fsave" instruction where GDB | |
294 | register REGNUM is stored. */ | |
295 | ||
296 | static int fsave_offset[] = | |
297 | { | |
298 | 28 + 0 * FPU_REG_RAW_SIZE, /* FP0_REGNUM through ... */ | |
299 | 28 + 1 * FPU_REG_RAW_SIZE, | |
300 | 28 + 2 * FPU_REG_RAW_SIZE, | |
301 | 28 + 3 * FPU_REG_RAW_SIZE, | |
302 | 28 + 4 * FPU_REG_RAW_SIZE, | |
303 | 28 + 5 * FPU_REG_RAW_SIZE, | |
304 | 28 + 6 * FPU_REG_RAW_SIZE, | |
305 | 28 + 7 * FPU_REG_RAW_SIZE, /* ... FP7_REGNUM. */ | |
306 | 0, /* FCTRL_REGNUM (16 bits). */ | |
307 | 4, /* FSTAT_REGNUM (16 bits). */ | |
308 | 8, /* FTAG_REGNUM (16 bits). */ | |
309 | 16, /* FISEG_REGNUM (16 bits). */ | |
310 | 12, /* FIOFF_REGNUM. */ | |
311 | 24, /* FOSEG_REGNUM. */ | |
312 | 20, /* FOOFF_REGNUM. */ | |
313 | 18 /* FOP_REGNUM (bottom 11 bits). */ | |
314 | }; | |
315 | ||
316 | #define FSAVE_ADDR(fsave, regnum) (fsave + fsave_offset[regnum - FP0_REGNUM]) | |
317 | \f | |
318 | ||
319 | /* Fill register REGNUM in GDB's register array with the appropriate | |
320 | value from *FSAVE. This function masks off any of the reserved | |
321 | bits in *FSAVE. */ | |
322 | ||
323 | void | |
324 | i387_supply_register (int regnum, char *fsave) | |
325 | { | |
932bb524 KD |
326 | if (fsave == NULL) |
327 | { | |
328 | supply_register (regnum, NULL); | |
329 | return; | |
330 | } | |
331 | ||
e750d25e JT |
332 | /* Most of the FPU control registers occupy only 16 bits in |
333 | the fsave area. Give those a special treatment. */ | |
334 | if (regnum >= FPC_REGNUM | |
335 | && regnum != FIOFF_REGNUM && regnum != FOOFF_REGNUM) | |
336 | { | |
337 | unsigned char val[4]; | |
338 | ||
339 | memcpy (val, FSAVE_ADDR (fsave, regnum), 2); | |
340 | val[2] = val[3] = 0; | |
341 | if (regnum == FOP_REGNUM) | |
342 | val[1] &= ((1 << 3) - 1); | |
343 | supply_register (regnum, val); | |
344 | } | |
345 | else | |
346 | supply_register (regnum, FSAVE_ADDR (fsave, regnum)); | |
347 | } | |
348 | ||
349 | /* Fill GDB's register array with the floating-point register values | |
350 | in *FSAVE. This function masks off any of the reserved | |
351 | bits in *FSAVE. */ | |
352 | ||
353 | void | |
354 | i387_supply_fsave (char *fsave) | |
355 | { | |
356 | int i; | |
357 | ||
358 | for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) | |
359 | i387_supply_register (i, fsave); | |
360 | } | |
361 | ||
362 | /* Fill register REGNUM (if it is a floating-point register) in *FSAVE | |
363 | with the value in GDB's register array. If REGNUM is -1, do this | |
364 | for all registers. This function doesn't touch any of the reserved | |
365 | bits in *FSAVE. */ | |
366 | ||
367 | void | |
368 | i387_fill_fsave (char *fsave, int regnum) | |
369 | { | |
370 | int i; | |
371 | ||
372 | for (i = FP0_REGNUM; i < XMM0_REGNUM; i++) | |
373 | if (regnum == -1 || regnum == i) | |
374 | { | |
375 | /* Most of the FPU control registers occupy only 16 bits in | |
376 | the fsave area. Give those a special treatment. */ | |
377 | if (i >= FPC_REGNUM | |
378 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) | |
379 | { | |
380 | unsigned char buf[4]; | |
381 | ||
382 | regcache_collect (i, buf); | |
383 | ||
384 | if (i == FOP_REGNUM) | |
385 | { | |
386 | /* The opcode occupies only 11 bits. Make sure we | |
387 | don't touch the other bits. */ | |
388 | buf[1] &= ((1 << 3) - 1); | |
389 | buf[1] |= ((FSAVE_ADDR (fsave, i))[1] & ~((1 << 3) - 1)); | |
390 | } | |
391 | memcpy (FSAVE_ADDR (fsave, i), buf, 2); | |
392 | } | |
393 | else | |
394 | regcache_collect (i, FSAVE_ADDR (fsave, i)); | |
395 | } | |
396 | } | |
397 | \f | |
398 | ||
399 | /* At fxsave_offset[REGNUM] you'll find the offset to the location in | |
400 | the data structure used by the "fxsave" instruction where GDB | |
401 | register REGNUM is stored. */ | |
402 | ||
403 | static int fxsave_offset[] = | |
404 | { | |
405 | 32, /* FP0_REGNUM through ... */ | |
406 | 48, | |
407 | 64, | |
408 | 80, | |
409 | 96, | |
410 | 112, | |
411 | 128, | |
412 | 144, /* ... FP7_REGNUM (80 bits each). */ | |
413 | 0, /* FCTRL_REGNUM (16 bits). */ | |
414 | 2, /* FSTAT_REGNUM (16 bits). */ | |
415 | 4, /* FTAG_REGNUM (16 bits). */ | |
416 | 12, /* FISEG_REGNUM (16 bits). */ | |
417 | 8, /* FIOFF_REGNUM. */ | |
418 | 20, /* FOSEG_REGNUM (16 bits). */ | |
419 | 16, /* FOOFF_REGNUM. */ | |
420 | 6, /* FOP_REGNUM (bottom 11 bits). */ | |
04c8243f MK |
421 | 160 + 0 * 16, /* XMM0_REGNUM through ... */ |
422 | 160 + 1 * 16, | |
423 | 160 + 2 * 16, | |
424 | 160 + 3 * 16, | |
425 | 160 + 4 * 16, | |
426 | 160 + 5 * 16, | |
427 | 160 + 6 * 16, | |
428 | 160 + 7 * 16, | |
429 | 160 + 8 * 16, | |
430 | 160 + 9 * 16, | |
431 | 160 + 10 * 16, | |
432 | 160 + 11 * 16, | |
433 | 160 + 12 * 16, | |
434 | 160 + 13 * 16, | |
435 | 160 + 14 * 16, | |
436 | 160 + 15 * 16, /* ... XMM15_REGNUM (128 bits each). */ | |
437 | 24 /* MXCSR_REGNUM. */ | |
e750d25e JT |
438 | }; |
439 | ||
04c8243f MK |
440 | /* FIXME: kettenis/20030430: We made an unfortunate choice in putting |
441 | %mxcsr after the SSE registers %xmm0-%xmm7 instead of before, since | |
442 | it makes supporting the registers %xmm8-%xmm15 on x86-64 a bit | |
443 | involved. Hack around it by explicitly overriding the offset for | |
444 | %mxcsr here. */ | |
445 | ||
e750d25e | 446 | #define FXSAVE_ADDR(fxsave, regnum) \ |
04c8243f MK |
447 | ((regnum == MXCSR_REGNUM) ? (fxsave + 24) : \ |
448 | (fxsave + fxsave_offset[regnum - FP0_REGNUM])) | |
e750d25e JT |
449 | |
450 | static int i387_tag (unsigned char *raw); | |
451 | \f | |
452 | ||
453 | /* Fill GDB's register array with the floating-point and SSE register | |
454 | values in *FXSAVE. This function masks off any of the reserved | |
455 | bits in *FXSAVE. */ | |
456 | ||
457 | void | |
458 | i387_supply_fxsave (char *fxsave) | |
459 | { | |
dff95cc7 MK |
460 | int i, last_regnum = MXCSR_REGNUM; |
461 | ||
462 | if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) | |
463 | last_regnum = FOP_REGNUM; | |
e750d25e | 464 | |
dff95cc7 | 465 | for (i = FP0_REGNUM; i <= last_regnum; i++) |
e750d25e | 466 | { |
932bb524 KD |
467 | if (fxsave == NULL) |
468 | { | |
469 | supply_register (i, NULL); | |
470 | continue; | |
471 | } | |
472 | ||
e750d25e JT |
473 | /* Most of the FPU control registers occupy only 16 bits in |
474 | the fxsave area. Give those a special treatment. */ | |
475 | if (i >= FPC_REGNUM && i < XMM0_REGNUM | |
476 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) | |
477 | { | |
478 | unsigned char val[4]; | |
479 | ||
480 | memcpy (val, FXSAVE_ADDR (fxsave, i), 2); | |
481 | val[2] = val[3] = 0; | |
482 | if (i == FOP_REGNUM) | |
483 | val[1] &= ((1 << 3) - 1); | |
484 | else if (i== FTAG_REGNUM) | |
485 | { | |
486 | /* The fxsave area contains a simplified version of the | |
487 | tag word. We have to look at the actual 80-bit FP | |
488 | data to recreate the traditional i387 tag word. */ | |
489 | ||
490 | unsigned long ftag = 0; | |
491 | int fpreg; | |
492 | int top; | |
493 | ||
494 | top = (((FXSAVE_ADDR (fxsave, FSTAT_REGNUM))[1] >> 3) & 0x7); | |
495 | ||
496 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
497 | { | |
498 | int tag; | |
499 | ||
500 | if (val[0] & (1 << fpreg)) | |
501 | { | |
502 | int regnum = (fpreg + 8 - top) % 8 + FP0_REGNUM; | |
503 | tag = i387_tag (FXSAVE_ADDR (fxsave, regnum)); | |
504 | } | |
505 | else | |
506 | tag = 3; /* Empty */ | |
507 | ||
508 | ftag |= tag << (2 * fpreg); | |
509 | } | |
510 | val[0] = ftag & 0xff; | |
511 | val[1] = (ftag >> 8) & 0xff; | |
512 | } | |
513 | supply_register (i, val); | |
514 | } | |
515 | else | |
516 | supply_register (i, FXSAVE_ADDR (fxsave, i)); | |
517 | } | |
518 | } | |
519 | ||
520 | /* Fill register REGNUM (if it is a floating-point or SSE register) in | |
521 | *FXSAVE with the value in GDB's register array. If REGNUM is -1, do | |
522 | this for all registers. This function doesn't touch any of the | |
523 | reserved bits in *FXSAVE. */ | |
524 | ||
525 | void | |
526 | i387_fill_fxsave (char *fxsave, int regnum) | |
527 | { | |
dff95cc7 MK |
528 | int i, last_regnum = MXCSR_REGNUM; |
529 | ||
530 | if (gdbarch_tdep (current_gdbarch)->num_xmm_regs == 0) | |
531 | last_regnum = FOP_REGNUM; | |
e750d25e | 532 | |
dff95cc7 | 533 | for (i = FP0_REGNUM; i <= last_regnum; i++) |
e750d25e JT |
534 | if (regnum == -1 || regnum == i) |
535 | { | |
536 | /* Most of the FPU control registers occupy only 16 bits in | |
537 | the fxsave area. Give those a special treatment. */ | |
538 | if (i >= FPC_REGNUM && i < XMM0_REGNUM | |
19e33363 | 539 | && i != FIOFF_REGNUM && i != FOOFF_REGNUM) |
e750d25e JT |
540 | { |
541 | unsigned char buf[4]; | |
542 | ||
543 | regcache_collect (i, buf); | |
544 | ||
545 | if (i == FOP_REGNUM) | |
546 | { | |
547 | /* The opcode occupies only 11 bits. Make sure we | |
548 | don't touch the other bits. */ | |
549 | buf[1] &= ((1 << 3) - 1); | |
550 | buf[1] |= ((FXSAVE_ADDR (fxsave, i))[1] & ~((1 << 3) - 1)); | |
551 | } | |
552 | else if (i == FTAG_REGNUM) | |
553 | { | |
554 | /* Converting back is much easier. */ | |
555 | ||
556 | unsigned short ftag; | |
557 | int fpreg; | |
558 | ||
559 | ftag = (buf[1] << 8) | buf[0]; | |
560 | buf[0] = 0; | |
561 | buf[1] = 0; | |
562 | ||
563 | for (fpreg = 7; fpreg >= 0; fpreg--) | |
564 | { | |
565 | int tag = (ftag >> (fpreg * 2)) & 3; | |
566 | ||
567 | if (tag != 3) | |
568 | buf[0] |= (1 << fpreg); | |
569 | } | |
570 | } | |
571 | memcpy (FXSAVE_ADDR (fxsave, i), buf, 2); | |
572 | } | |
573 | else | |
574 | regcache_collect (i, FXSAVE_ADDR (fxsave, i)); | |
575 | } | |
576 | } | |
577 | ||
578 | /* Recreate the FTW (tag word) valid bits from the 80-bit FP data in | |
579 | *RAW. */ | |
580 | ||
581 | static int | |
582 | i387_tag (unsigned char *raw) | |
583 | { | |
584 | int integer; | |
585 | unsigned int exponent; | |
586 | unsigned long fraction[2]; | |
587 | ||
588 | integer = raw[7] & 0x80; | |
589 | exponent = (((raw[9] & 0x7f) << 8) | raw[8]); | |
590 | fraction[0] = ((raw[3] << 24) | (raw[2] << 16) | (raw[1] << 8) | raw[0]); | |
591 | fraction[1] = (((raw[7] & 0x7f) << 24) | (raw[6] << 16) | |
592 | | (raw[5] << 8) | raw[4]); | |
593 | ||
594 | if (exponent == 0x7fff) | |
595 | { | |
596 | /* Special. */ | |
597 | return (2); | |
598 | } | |
599 | else if (exponent == 0x0000) | |
600 | { | |
601 | if (fraction[0] == 0x0000 && fraction[1] == 0x0000 && !integer) | |
602 | { | |
603 | /* Zero. */ | |
604 | return (1); | |
605 | } | |
606 | else | |
607 | { | |
608 | /* Special. */ | |
609 | return (2); | |
610 | } | |
611 | } | |
612 | else | |
613 | { | |
614 | if (integer) | |
615 | { | |
616 | /* Valid. */ | |
617 | return (0); | |
618 | } | |
619 | else | |
620 | { | |
621 | /* Special. */ | |
622 | return (2); | |
623 | } | |
624 | } | |
625 | } |